IDEA-57233 Editor font antialising/appearance problems on Linux

Used desktop DPI instead of hard-coded 72 Compensated increased glyph bitmap size by adjusting font size Added LCD filter for sub-pixel rendering Use fontconfig library to provide right rendering options for fonts Corrected sizes passed to fontconfig library and hinting disabling policy Added logging and versioned fontconfig lib loading Resolved font rendering problem in lenses (cherry picked from commit 0456745afb)
JBR-2922 add JCEF to jbrsdk binaries
2026-01-07 17:11:42 +01:00 · 2021-02-25 17:09:06 +03:00 · 2021-02-25 07:00:18 +03:00 · 2021-02-25 07:00:18 +03:00 · 2021-02-25 07:00:18 +03:00 · 2021-02-25 07:00:18 +03:00
9960 changed files with 757163 additions and 234692 deletions
--- a/.github/workflows/submit.yml
+++ b/.github/workflows/submit.yml
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 /dist/
 /.idea/
 /.vscode/
+/nbproject/
 nbproject/private/
 /webrev
 /.src-rev
@@ -14,3 +15,4 @@ test/nashorn/lib
 NashornProfile.txt
 **/JTreport/**
 **/JTwork/**
+/src/utils/LogCompilation/target/
--- a/.hgignore
+++ b/.hgignore
@@ -1,18 +0,0 @@
-^build/
-^dist/
-^.idea/
-^.vscode/
-nbproject/private/
-^webrev
-^.src-rev$
-^.jib/
-(^|/)\.DS_Store
-(^|/)\.metadata/
-(^|/)\.recommenders/
-test/nashorn/script/external
-test/nashorn/lib
-NashornProfile.txt
-(^|/)JTreport/
-(^|/)JTwork/
-(^|/)\.git/
-^src/utils/hsdis/build/
--- a/.jcheck/conf
+++ b/.jcheck/conf
@@ -3,10 +3,10 @@ project=jdk
 jbs=JDK

 [checks]
-error=blacklist.author,committer,reviewers,merge,issues,executable,symlink,message,hg-tag,whitespace
+error=author,committer,reviewers,merge,issues,executable,symlink,message,hg-tag,whitespace,problemlists

 [repository]
-tags=(?:jdk-(?:[1-9]([0-9]*)(?:\\.(?:0|[1-9][0-9]*)){0,4})(?:\\+(?:(?:[0-9]+))|(?:-ga)))|(?:jdk[4-9](?:u\\d{1,3})?-(?:(?:b\\d{2,3})|(?:ga)))|(?:hs\\d\\d(?:\\.\\d{1,2})?-b\\d\\d)
+tags=(?:jdk-(?:[1-9]([0-9]*)(?:\.(?:0|[1-9][0-9]*)){0,4})(?:\+(?:(?:[0-9]+))|(?:-ga)))|(?:jdk[4-9](?:u\d{1,3})?-(?:(?:b\d{2,3})|(?:ga)))|(?:hs\d\d(?:\.\d{1,2})?-b\d\d)
 branches=

 [census]
@@ -14,7 +14,8 @@ version=0
 domain=openjdk.org

 [checks "whitespace"]
-files=.*\.cpp|.*\.hpp|.*\.c|.*\.h|.*\.java
+files=.*\.cpp|.*\.hpp|.*\.c|.*\.h|.*\.java|.*\.cc|.*\.hh|.*\.m|.*\.mm|.*\.gmk|.*\.m4|.*\.ac|Makefile
+ignore-tabs=.*\.gmk|Makefile

 [checks "merge"]
 message=Merge
@@ -28,3 +29,6 @@ role=committer

 [checks "issues"]
 pattern=^([124-8][0-9]{6}): (\S.*)$
+
+[checks "problemlists"]
+dirs=test/jdk|test/langtools|test/lib-test|test/hotspot/jtreg|test/jaxp
--- a/0
+++ b/0
--- a/doc/building.html
+++ b/doc/building.html
@@ -78,6 +78,7 @@
 <li><a href="#native-libraries">Native Libraries</a></li>
 <li><a href="#creating-and-using-sysroots-with-qemu-deboostrap">Creating And Using Sysroots With qemu-deboostrap</a></li>
 <li><a href="#building-for-armaarch64">Building for ARM/aarch64</a></li>
+<li><a href="#building-for-musl">Building for musl</a></li>
 <li><a href="#verifying-the-build">Verifying the Build</a></li>
 </ul></li>
 <li><a href="#build-performance">Build Performance</a><ul>
@@ -96,12 +97,10 @@
 <li><a href="#getting-help">Getting Help</a></li>
 </ul></li>
 <li><a href="#hints-and-suggestions-for-advanced-users">Hints and Suggestions for Advanced Users</a><ul>
-<li><a href="#setting-up-a-repository-for-pushing-changes-defpath">Setting Up a Repository for Pushing Changes (defpath)</a></li>
 <li><a href="#bash-completion">Bash Completion</a></li>
 <li><a href="#using-multiple-configurations">Using Multiple Configurations</a></li>
 <li><a href="#handling-reconfigurations">Handling Reconfigurations</a></li>
 <li><a href="#using-fine-grained-make-targets">Using Fine-Grained Make Targets</a></li>
-<li><a href="#learn-about-mercurial">Learn About Mercurial</a></li>
 </ul></li>
 <li><a href="#understanding-the-build-system">Understanding the Build System</a><ul>
 <li><a href="#configurations">Configurations</a></li>
@@ -115,10 +114,10 @@
 </ul>
 </nav>
 <h2 id="tldr-instructions-for-the-impatient">TL;DR (Instructions for the Impatient)</h2>
-<p>If you are eager to try out building the JDK, these simple steps works most of the time. They assume that you have installed Mercurial (and Cygwin if running on Windows) and cloned the top-level JDK repository that you want to build.</p>
+<p>If you are eager to try out building the JDK, these simple steps works most of the time. They assume that you have installed Git (and Cygwin if running on Windows) and cloned the top-level JDK repository that you want to build.</p>
 <ol type="1">
 <li><p><a href="#getting-the-source-code">Get the complete source code</a>:<br />
-<code>hg clone http://hg.openjdk.java.net/jdk/jdk</code></p></li>
+<code>git clone https://git.openjdk.java.net/jdk/</code></p></li>
 <li><p><a href="#running-configure">Run configure</a>:<br />
 <code>bash configure</code></p>
 <p>If <code>configure</code> fails due to missing dependencies (to either the <a href="#native-compiler-toolchain-requirements">toolchain</a>, <a href="#build-tools-requirements">build tools</a>, <a href="#external-library-requirements">external libraries</a> or the <a href="#boot-jdk-requirements">boot JDK</a>), most of the time it prints a suggestion on how to resolve the situation on your platform. Follow the instructions, and try running <code>bash configure</code> again.</p></li>
@@ -134,8 +133,8 @@
 <p>The JDK is a complex software project. Building it requires a certain amount of technical expertise, a fair number of dependencies on external software, and reasonably powerful hardware.</p>
 <p>If you just want to use the JDK and not build it yourself, this document is not for you. See for instance <a href="http://openjdk.java.net/install">OpenJDK installation</a> for some methods of installing a prebuilt JDK.</p>
 <h2 id="getting-the-source-code">Getting the Source Code</h2>
-<p>Make sure you are getting the correct version. As of JDK 10, the source is no longer split into separate repositories so you only need to clone one single repository. At the <a href="http://hg.openjdk.java.net/">OpenJDK Mercurial server</a> you can see a list of all available repositories. If you want to build an older version, e.g. JDK 8, it is recommended that you get the <code>jdk8u</code> forest, which contains incremental updates, instead of the <code>jdk8</code> forest, which was frozen at JDK 8 GA.</p>
-<p>If you are new to Mercurial, a good place to start is the <a href="http://www.mercurial-scm.org/guide">Mercurial Beginner's Guide</a>. The rest of this document assumes a working knowledge of Mercurial.</p>
+<p>Make sure you are getting the correct version. As of JDK 10, the source is no longer split into separate repositories so you only need to clone one single repository. At the <a href="https://git.openjdk.java.net/">OpenJDK Git site</a> you can see a list of all available repositories. If you want to build an older version, e.g. JDK 11, it is recommended that you get the <code>jdk11u</code> repo, which contains incremental updates, instead of the <code>jdk11</code> repo, which was frozen at JDK 11 GA.</p>
+<p>If you are new to Git, a good place to start is the book <a href="https://git-scm.com/book/en/v2">Pro Git</a>. The rest of this document assumes a working knowledge of Git.</p>
 <h3 id="special-considerations">Special Considerations</h3>
 <p>For a smooth building experience, it is recommended that you follow these rules on where and how to check out the source code.</p>
 <ul>
@@ -146,7 +145,11 @@
 <ul>
 <li><p>Create the directory that is going to contain the top directory of the JDK clone by using the <code>mkdir</code> command in the Cygwin bash shell. That is, do <em>not</em> create it using Windows Explorer. This will ensure that it will have proper Cygwin attributes, and that it's children will inherit those attributes.</p></li>
 <li><p>Do not put the JDK clone in a path under your Cygwin home directory. This is especially important if your user name contains spaces and/or mixed upper and lower case letters.</p></li>
-<li><p>Clone the JDK repository using the Cygwin command line <code>hg</code> client as instructed in this document. That is, do <em>not</em> use another Mercurial client such as TortoiseHg.</p></li>
+<li><p>You need to install a git client. You have two choices, Cygwin git or Git for Windows. Unfortunately there are pros and cons with each choice.</p>
+<ul>
+<li><p>The Cygwin <code>git</code> client has no line ending issues and understands Cygwin paths (which are used throughout the JDK build system). However, it does not currently work well with the Skara CLI tooling. Please see the <a href="https://wiki.openjdk.java.net/display/SKARA/Skara#Skara-Git">Skara wiki on Git clients</a> for up-to-date information about the Skara git client support.</p></li>
+<li><p>The <a href="https://gitforwindows.org">Git for Windows</a> client has issues with line endings, and do not understand Cygwin paths. It does work well with the Skara CLI tooling, however. To alleviate the line ending problems, make sure you set <code>core.autocrlf</code> to <code>false</code> (this is asked during installation).</p></li>
+</ul></li>
 </ul>
 <p>Failure to follow this procedure might result in hard-to-debug build problems.</p></li>
 </ul>
@@ -193,7 +196,7 @@
 <p>Windows XP is not a supported platform, but all newer Windows should be able to build the JDK.</p>
 <p>On Windows, it is important that you pay attention to the instructions in the <a href="#special-considerations">Special Considerations</a>.</p>
 <p>Windows is the only non-POSIX OS supported by the JDK, and as such, requires some extra care. A POSIX support layer is required to build on Windows. Currently, the only supported such layers are Cygwin and Windows Subsystem for Linux (WSL). (Msys is no longer supported due to a too old bash; msys2 would likely be possible to support in a future version but that would require effort to implement.)</p>
-<p>Internally in the build system, all paths are represented as Unix-style paths, e.g. <code>/cygdrive/c/hg/jdk9/Makefile</code> rather than <code>C:\hg\jdk9\Makefile</code>. This rule also applies to input to the build system, e.g. in arguments to <code>configure</code>. So, use <code>--with-msvcr-dll=/cygdrive/c/msvcr100.dll</code> rather than <code>--with-msvcr-dll=c:\msvcr100.dll</code>. For details on this conversion, see the section on <a href="#fixpath">Fixpath</a>.</p>
+<p>Internally in the build system, all paths are represented as Unix-style paths, e.g. <code>/cygdrive/c/git/jdk/Makefile</code> rather than <code>C:\git\jdk\Makefile</code>. This rule also applies to input to the build system, e.g. in arguments to <code>configure</code>. So, use <code>--with-msvcr-dll=/cygdrive/c/msvcr100.dll</code> rather than <code>--with-msvcr-dll=c:\msvcr100.dll</code>. For details on this conversion, see the section on <a href="#fixpath">Fixpath</a>.</p>
 <h4 id="cygwin">Cygwin</h4>
 <p>A functioning <a href="http://www.cygwin.com/">Cygwin</a> environment is required for building the JDK on Windows. If you have a 64-bit OS, we strongly recommend using the 64-bit version of Cygwin.</p>
 <p><strong>Note:</strong> Cygwin has a model of continuously updating all packages without any easy way to install or revert to a specific version of a package. This means that whenever you add or update a package in Cygwin, you might (inadvertently) update tools that are used by the JDK build process, and that can cause unexpected build problems.</p>
@@ -224,6 +227,8 @@
 <pre><code>sudo apt-get install build-essential</code></pre>
 <p>For rpm-based distributions (Fedora, Red Hat, etc), try this:</p>
 <pre><code>sudo yum groupinstall &quot;Development Tools&quot;</code></pre>
+<p>For Alpine Linux, aside from basic tooling, install the GNU versions of some programs:</p>
+<pre><code>sudo apk add build-base bash grep zip</code></pre>
 <h3 id="aix">AIX</h3>
 <p>Please consult the AIX section of the <a href="https://wiki.openjdk.java.net/display/Build/Supported+Build+Platforms">Supported Build Platforms</a> OpenJDK Build Wiki page for details about which versions of AIX are supported.</p>
 <h2 id="native-compiler-toolchain-requirements">Native Compiler (Toolchain) Requirements</h2>
@@ -265,7 +270,7 @@
 <tbody>
 <tr class="odd">
 <td style="text-align: left;">Linux</td>
-<td style="text-align: left;">gcc 9.2.0</td>
+<td style="text-align: left;">gcc 10.2.0</td>
 </tr>
 <tr class="even">
 <td style="text-align: left;">macOS</td>
@@ -273,14 +278,14 @@
 </tr>
 <tr class="odd">
 <td style="text-align: left;">Windows</td>
-<td style="text-align: left;">Microsoft Visual Studio 2019 update 16.5.3</td>
+<td style="text-align: left;">Microsoft Visual Studio 2019 update 16.7.2</td>
 </tr>
 </tbody>
 </table>
 <p>All compilers are expected to be able to compile to the C99 language standard, as some C99 features are used in the source code. Microsoft Visual Studio doesn't fully support C99 so in practice shared code is limited to using C99 features that it does support.</p>
 <h3 id="gcc">gcc</h3>
 <p>The minimum accepted version of gcc is 5.0. Older versions will generate a warning by <code>configure</code> and are unlikely to work.</p>
-<p>The JDK is currently known to be able to compile with at least version 9.2 of gcc.</p>
+<p>The JDK is currently known to be able to compile with at least version 10.2 of gcc.</p>
 <p>In general, any version between these two should be usable.</p>
 <h3 id="clang">clang</h3>
 <p>The minimum accepted version of clang is 3.5. Older versions will not be accepted by <code>configure</code>.</p>
@@ -294,6 +299,7 @@
 <h3 id="microsoft-visual-studio">Microsoft Visual Studio</h3>
 <p>The minimum accepted version of Visual Studio is 2017. Older versions will not be accepted by <code>configure</code> and will not work. The maximum accepted version of Visual Studio is 2019.</p>
 <p>If you have multiple versions of Visual Studio installed, <code>configure</code> will by default pick the latest. You can request a specific version to be used by setting <code>--with-toolchain-version</code>, e.g. <code>--with-toolchain-version=2017</code>.</p>
+<p>If you have Visual Studio installed but <code>configure</code> fails to detect it, it may be because of <a href="#spaces-in-path">spaces in path</a>.</p>
 <h3 id="ibm-xl-cc">IBM XL C/C++</h3>
 <p>Please consult the AIX section of the <a href="https://wiki.openjdk.java.net/display/Build/Supported+Build+Platforms">Supported Build Platforms</a> OpenJDK Build Wiki page for details about which versions of XLC are supported.</p>
 <h2 id="boot-jdk-requirements">Boot JDK Requirements</h2>
@@ -313,6 +319,7 @@
 <ul>
 <li>To install on an apt-based Linux, try running <code>sudo apt-get install libfreetype6-dev</code>.</li>
 <li>To install on an rpm-based Linux, try running <code>sudo yum install freetype-devel</code>.</li>
+<li>To install on Alpine Linux, try running <code>sudo apk add freetype-dev</code>.</li>
 </ul>
 <p>Use <code>--with-freetype-include=&lt;path&gt;</code> and <code>--with-freetype-lib=&lt;path&gt;</code> if <code>configure</code> does not automatically locate the platform FreeType files.</p>
 <h3 id="cups">CUPS</h3>
@@ -320,6 +327,7 @@
 <ul>
 <li>To install on an apt-based Linux, try running <code>sudo apt-get install libcups2-dev</code>.</li>
 <li>To install on an rpm-based Linux, try running <code>sudo yum install cups-devel</code>.</li>
+<li>To install on Alpine Linux, try running <code>sudo apk add cups-dev</code>.</li>
 </ul>
 <p>Use <code>--with-cups=&lt;path&gt;</code> if <code>configure</code> does not properly locate your CUPS files.</p>
 <h3 id="x11">X11</h3>
@@ -327,6 +335,7 @@
 <ul>
 <li>To install on an apt-based Linux, try running <code>sudo apt-get install libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev</code>.</li>
 <li>To install on an rpm-based Linux, try running <code>sudo yum install libXtst-devel libXt-devel libXrender-devel libXrandr-devel libXi-devel</code>.</li>
+<li>To install on Alpine Linux, try running <code>sudo apk add libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev</code>.</li>
 </ul>
 <p>Use <code>--with-x=&lt;path&gt;</code> if <code>configure</code> does not properly locate your X11 files.</p>
 <h3 id="alsa">ALSA</h3>
@@ -334,6 +343,7 @@
 <ul>
 <li>To install on an apt-based Linux, try running <code>sudo apt-get install libasound2-dev</code>.</li>
 <li>To install on an rpm-based Linux, try running <code>sudo yum install alsa-lib-devel</code>.</li>
+<li>To install on Alpine Linux, try running <code>sudo apk add alsa-lib-dev</code>.</li>
 </ul>
 <p>Use <code>--with-alsa=&lt;path&gt;</code> if <code>configure</code> does not properly locate your ALSA files.</p>
 <h3 id="libffi">libffi</h3>
@@ -341,6 +351,7 @@
 <ul>
 <li>To install on an apt-based Linux, try running <code>sudo apt-get install libffi-dev</code>.</li>
 <li>To install on an rpm-based Linux, try running <code>sudo yum install libffi-devel</code>.</li>
+<li>To install on Alpine Linux, try running <code>sudo apk add libffi-dev</code>.</li>
 </ul>
 <p>Use <code>--with-libffi=&lt;path&gt;</code> if <code>configure</code> does not properly locate your libffi files.</p>
 <h2 id="build-tools-requirements">Build Tools Requirements</h2>
@@ -349,6 +360,7 @@
 <ul>
 <li>To install on an apt-based Linux, try running <code>sudo apt-get install autoconf</code>.</li>
 <li>To install on an rpm-based Linux, try running <code>sudo yum install autoconf</code>.</li>
+<li>To install on Alpine Linux, try running <code>sudo apk add autoconf</code>.</li>
 <li>To install on macOS, try running <code>brew install autoconf</code>.</li>
 <li>To install on Windows, try running <code>&lt;path to Cygwin setup&gt;/setup-x86_64 -q -P autoconf</code>.</li>
 </ul>
@@ -391,7 +403,7 @@
 <li><code>--enable-jvm-feature-&lt;feature&gt;</code> or <code>--disable-jvm-feature-&lt;feature&gt;</code> - Include (or exclude) <code>&lt;feature&gt;</code> as a JVM feature in Hotspot. You can also specify a list of features to be enabled, separated by space or comma, as <code>--with-jvm-features=&lt;feature&gt;[,&lt;feature&gt;...]</code>. If you prefix <code>&lt;feature&gt;</code> with a <code>-</code>, it will be disabled. These options will modify the default list of features for the JVM variant(s) you are building. For the <code>custom</code> JVM variant, the default list is empty. A complete list of valid JVM features can be found using <code>bash configure --help</code>.</li>
 <li><code>--with-target-bits=&lt;bits&gt;</code> - Create a target binary suitable for running on a <code>&lt;bits&gt;</code> platform. Use this to create 32-bit output on a 64-bit build platform, instead of doing a full cross-compile. (This is known as a <em>reduced</em> build.)</li>
 </ul>
-<p>On Linux, BSD and AIX, it is possible to override where Java by default searches for runtime/JNI libraries. This can be useful in situations where there is a special shared directory for system JNI libraries. This setting can in turn be overriden at runtime by setting the <code>java.library.path</code> property.</p>
+<p>On Linux, BSD and AIX, it is possible to override where Java by default searches for runtime/JNI libraries. This can be useful in situations where there is a special shared directory for system JNI libraries. This setting can in turn be overridden at runtime by setting the <code>java.library.path</code> property.</p>
 <ul>
 <li><code>--with-jni-libpath=&lt;path&gt;</code> - Use the specified path as a default when searching for runtime libraries.</li>
 </ul>
@@ -430,7 +442,7 @@
 <h3 id="configure-control-variables">Configure Control Variables</h3>
 <p>It is possible to control certain aspects of <code>configure</code> by overriding the value of <code>configure</code> variables, either on the command line or in the environment.</p>
 <p>Normally, this is <strong>not recommended</strong>. If used improperly, it can lead to a broken configuration. Unless you're well versed in the build system, this is hard to use properly. Therefore, <code>configure</code> will print a warning if this is detected.</p>
-<p>However, there are a few <code>configure</code> variables, known as <em>control variables</em> that are supposed to be overriden on the command line. These are variables that describe the location of tools needed by the build, like <code>MAKE</code> or <code>GREP</code>. If any such variable is specified, <code>configure</code> will use that value instead of trying to autodetect the tool. For instance, <code>bash configure MAKE=/opt/gnumake4.0/bin/make</code>.</p>
+<p>However, there are a few <code>configure</code> variables, known as <em>control variables</em> that are supposed to be overridden on the command line. These are variables that describe the location of tools needed by the build, like <code>MAKE</code> or <code>GREP</code>. If any such variable is specified, <code>configure</code> will use that value instead of trying to autodetect the tool. For instance, <code>bash configure MAKE=/opt/gnumake4.0/bin/make</code>.</p>
 <p>If a configure argument exists, use that instead, e.g. use <code>--with-jtreg</code> instead of setting <code>JTREGEXE</code>.</p>
 <p>Also note that, despite what autoconf claims, setting <code>CFLAGS</code> will not accomplish anything. Instead use <code>--with-extra-cflags</code> (and similar for <code>cxxflags</code> and <code>ldflags</code>).</p>
 <h2 id="running-make">Running Make</h2>
@@ -467,7 +479,7 @@
 <h3 id="make-control-variables">Make Control Variables</h3>
 <p>It is possible to control <code>make</code> behavior by overriding the value of <code>make</code> variables, either on the command line or in the environment.</p>
 <p>Normally, this is <strong>not recommended</strong>. If used improperly, it can lead to a broken build. Unless you're well versed in the build system, this is hard to use properly. Therefore, <code>make</code> will print a warning if this is detected.</p>
-<p>However, there are a few <code>make</code> variables, known as <em>control variables</em> that are supposed to be overriden on the command line. These make up the &quot;make time&quot; configuration, as opposed to the &quot;configure time&quot; configuration.</p>
+<p>However, there are a few <code>make</code> variables, known as <em>control variables</em> that are supposed to be overridden on the command line. These make up the &quot;make time&quot; configuration, as opposed to the &quot;configure time&quot; configuration.</p>
 <h4 id="general-make-control-variables">General Make Control Variables</h4>
 <ul>
 <li><code>JOBS</code> - Specify the number of jobs to build with. See <a href="#build-performance">Build Performance</a>.</li>
@@ -620,21 +632,30 @@ cp: cannot stat `arm-linux-gnueabihf/libXt.so&#39;: No such file or directory</c
 <p>Fortunately, you can create sysroots for foreign architectures with tools provided by your OS. On Debian/Ubuntu systems, one could use <code>qemu-deboostrap</code> to create the <em>target</em> system chroot, which would have the native libraries and headers specific to that <em>target</em> system. After that, we can use the cross-compiler on the <em>build</em> system, pointing into chroot to get the build dependencies right. This allows building for foreign architectures with native compilation speed.</p>
 <p>For example, cross-compiling to AArch64 from x86_64 could be done like this:</p>
 <ul>
-<li>Install cross-compiler on the <em>build</em> system:</li>
-</ul>
-<pre><code>apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu</code></pre>
-<ul>
-<li>Create chroot on the <em>build</em> system, configuring it for <em>target</em> system:</li>
-</ul>
-<pre><code>sudo qemu-debootstrap --arch=arm64 --verbose \
-       --include=fakeroot,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng12-dev \
-       --resolve-deps jessie /chroots/arm64 http://httpredir.debian.org/debian/</code></pre>
-<ul>
-<li>Configure and build with newly created chroot as sysroot/toolchain-path:</li>
-</ul>
-<pre><code>CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure --openjdk-target=aarch64-linux-gnu --with-sysroot=/chroots/arm64/ --with-toolchain-path=/chroots/arm64/
+<li><p>Install cross-compiler on the <em>build</em> system:</p>
+<pre><code>apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu</code></pre></li>
+<li><p>Create chroot on the <em>build</em> system, configuring it for <em>target</em> system:</p>
+<pre><code>sudo qemu-debootstrap \
+  --arch=arm64 \
+  --verbose \
+  --include=fakeroot,symlinks,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng-dev \
+  --resolve-deps \
+  buster \
+  ~/sysroot-arm64 \
+  http://httpredir.debian.org/debian/</code></pre></li>
+<li><p>Make sure the symlinks inside the newly created chroot point to proper locations:</p>
+<pre><code>sudo chroot ~/sysroot-arm64 symlinks -cr .</code></pre></li>
+<li><p>Configure and build with newly created chroot as sysroot/toolchain-path:</p>
+<pre><code>CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure \
+ --openjdk-target=aarch64-linux-gnu \
+ --with-sysroot=~/sysroot-arm64 \
+ --with-toolchain-path=~/sysroot-arm64 \
+ --with-freetype-lib=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/ \
+ --with-freetype-include=~/sysroot-arm64/usr/include/freetype2/ \
+ --x-libraries=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/
 make images
-ls build/linux-aarch64-normal-server-release/</code></pre>
+ls build/linux-aarch64-server-release/</code></pre></li>
+</ul>
 <p>The build does not create new files in that chroot, so it can be reused for multiple builds without additional cleanup.</p>
 <p>Architectures that are known to successfully cross-compile like this are:</p>
 <table>
@@ -688,6 +709,15 @@ ls build/linux-aarch64-normal-server-release/</code></pre>
 <p>Additional architectures might be supported by Debian/Ubuntu Ports.</p>
 <h3 id="building-for-armaarch64">Building for ARM/aarch64</h3>
 <p>A common cross-compilation target is the ARM CPU. When building for ARM, it is useful to set the ABI profile. A number of pre-defined ABI profiles are available using <code>--with-abi-profile</code>: arm-vfp-sflt, arm-vfp-hflt, arm-sflt, armv5-vfp-sflt, armv6-vfp-hflt. Note that soft-float ABIs are no longer properly supported by the JDK.</p>
+<h3 id="building-for-musl">Building for musl</h3>
+<p>Just like it's possible to cross-compile for a different CPU, it's possible to cross-compile for musl libc on a glibc-based <em>build</em> system. A devkit suitable for most target CPU architectures can be obtained from <a href="https://musl.cc">musl.cc</a>. After installing the required packages in the sysroot, configure the build with <code>--openjdk-target</code>:</p>
+<pre><code>sh ./configure --with-jvm-variants=server \
+--with-boot-jdk=$BOOT_JDK \
+--with-build-jdk=$BUILD_JDK \
+--openjdk-target=x86_64-unknown-linux-musl \
+--with-devkit=$DEVKIT \
+--with-sysroot=$SYSROOT</code></pre>
+<p>and run <code>make</code> normally.</p>
 <h3 id="verifying-the-build">Verifying the Build</h3>
 <p>The build will end up in a directory named like <code>build/linux-arm-normal-server-release</code>.</p>
 <p>Inside this build output directory, the <code>images/jdk</code> will contain the newly built JDK, for your <em>target</em> system.</p>
@@ -731,14 +761,14 @@ ls build/linux-aarch64-normal-server-release/</code></pre>

 === Output from failing command(s) repeated here ===
 * For target hotspot_variant-server_libjvm_objs_psMemoryPool.o:
-/localhome/hg/jdk9-sandbox/hotspot/src/share/vm/services/psMemoryPool.cpp:1:1: error: &#39;failhere&#39; does not name a type
+/localhome/git/jdk-sandbox/hotspot/src/share/vm/services/psMemoryPool.cpp:1:1: error: &#39;failhere&#39; does not name a type
   ... (rest of output omitted)

-* All command lines available in /localhome/hg/jdk9-sandbox/build/linux-x64/make-support/failure-logs.
+* All command lines available in /localhome/git/jdk-sandbox/build/linux-x64/make-support/failure-logs.
 === End of repeated output ===

 === Make failed targets repeated here ===
-lib/CompileJvm.gmk:207: recipe for target &#39;/localhome/hg/jdk9-sandbox/build/linux-x64/hotspot/variant-server/libjvm/objs/psMemoryPool.o&#39; failed
+lib/CompileJvm.gmk:207: recipe for target &#39;/localhome/git/jdk-sandbox/build/linux-x64/hotspot/variant-server/libjvm/objs/psMemoryPool.o&#39; failed
 make/Main.gmk:263: recipe for target &#39;hotspot-server-libs&#39; failed
 === End of repeated output ===

@@ -765,7 +795,7 @@ Hint: If caused by a warning, try configure --disable-warnings-as-errors.</code>
 <p>Here are a suggested list of things to try if you are having unexpected build problems. Each step requires more time than the one before, so try them in order. Most issues will be solved at step 1 or 2.</p>
 <ol type="1">
 <li><p>Make sure your repository is up-to-date</p>
-<p>Run <code>hg pull -u</code> to make sure you have the latest changes.</p></li>
+<p>Run <code>git pull origin master</code> to make sure you have the latest changes.</p></li>
 <li><p>Clean build results</p>
 <p>The simplest way to fix incremental rebuild issues is to run <code>make clean</code>. This will remove all build results, but not the configuration or any build system support artifacts. In most cases, this will solve build errors resulting from incremental build mismatches.</p></li>
 <li><p>Completely clean the build directory.</p>
@@ -774,8 +804,8 @@ Hint: If caused by a warning, try configure --disable-warnings-as-errors.</code>
 make dist-clean
 bash configure $(cat current-configuration)
 make</code></pre></li>
-<li><p>Re-clone the Mercurial repository</p>
-<p>Sometimes the Mercurial repository gets in a state that causes the product to be un-buildable. In such a case, the simplest solution is often the &quot;sledgehammer approach&quot;: delete the entire repository, and re-clone it. If you have local changes, save them first to a different location using <code>hg export</code>.</p></li>
+<li><p>Re-clone the Git repository</p>
+<p>Sometimes the Git repository gets in a state that causes the product to be un-buildable. In such a case, the simplest solution is often the &quot;sledgehammer approach&quot;: delete the entire repository, and re-clone it. If you have local changes, save them first to a different location using <code>git format-patch</code>.</p></li>
 </ol>
 <h3 id="specific-build-issues">Specific Build Issues</h3>
 <h4 id="clock-skew">Clock Skew</h4>
@@ -790,23 +820,12 @@ Clock skew detected. Your build may be incomplete.</code></pre>
 cannot create ... Permission denied
 spawn failed</code></pre>
 <p>This can be a sign of a Cygwin problem. See the information about solving problems in the <a href="#cygwin">Cygwin</a> section. Rebooting the computer might help temporarily.</p>
+<h4 id="spaces-in-path">Spaces in Path</h4>
+<p>On Windows, when configuring, <code>fixpath.sh</code> may report that some directory names have spaces. Usually, it assumes those directories have <a href="https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-8dot3name">short paths</a>. You can run <code>fsutil file setshortname</code> in <code>cmd</code> on certain directories, such as <code>Microsoft Visual Studio</code> or <code>Windows Kits</code>, to assign arbitrary short paths so <code>configure</code> can access them.</p>
 <h3 id="getting-help">Getting Help</h3>
 <p>If none of the suggestions in this document helps you, or if you find what you believe is a bug in the build system, please contact the Build Group by sending a mail to <a href="mailto:build-dev@openjdk.java.net">build-dev@openjdk.java.net</a>. Please include the relevant parts of the configure and/or build log.</p>
 <p>If you need general help or advice about developing for the JDK, you can also contact the Adoption Group. See the section on <a href="#contributing-to-openjdk">Contributing to OpenJDK</a> for more information.</p>
 <h2 id="hints-and-suggestions-for-advanced-users">Hints and Suggestions for Advanced Users</h2>
-<h3 id="setting-up-a-repository-for-pushing-changes-defpath">Setting Up a Repository for Pushing Changes (defpath)</h3>
-<p>To help you prepare a proper push path for a Mercurial repository, there exists a useful tool known as <a href="http://openjdk.java.net/projects/code-tools/defpath">defpath</a>. It will help you setup a proper push path for pushing changes to the JDK.</p>
-<p>Install the extension by cloning <code>http://hg.openjdk.java.net/code-tools/defpath</code> and updating your <code>.hgrc</code> file. Here's one way to do this:</p>
-<pre><code>cd ~
-mkdir hg-ext
-cd hg-ext
-hg clone http://hg.openjdk.java.net/code-tools/defpath
-cat &lt;&lt; EOT &gt;&gt; ~/.hgrc
-[extensions]
-defpath=~/hg-ext/defpath/defpath.py
-EOT</code></pre>
-<p>You can now setup a proper push path using:</p>
-<pre><code>hg defpath -d -u &lt;your OpenJDK username&gt;</code></pre>
 <h3 id="bash-completion">Bash Completion</h3>
 <p>The <code>configure</code> and <code>make</code> commands tries to play nice with bash command-line completion (using <code>&lt;tab&gt;</code> or <code>&lt;tab&gt;&lt;tab&gt;</code>). To use this functionality, make sure you enable completion in your <code>~/.bashrc</code> (see instructions for bash in your operating system).</p>
 <p>Make completion will work out of the box, and will complete valid make targets. For instance, typing <code>make jdk-i&lt;tab&gt;</code> will complete to <code>make jdk-image</code>.</p>
@@ -830,7 +849,7 @@ sudo mv /tmp/configure /usr/local/bin</code></pre>
 <p>If you update the repository and part of the configure script has changed, the build system will force you to re-run <code>configure</code>.</p>
 <p>Most of the time, you will be fine by running <code>configure</code> again with the same arguments as the last time, which can easily be performed by <code>make reconfigure</code>. To simplify this, you can use the <code>CONF_CHECK</code> make control variable, either as <code>make CONF_CHECK=auto</code>, or by setting an environment variable. For instance, if you add <code>export CONF_CHECK=auto</code> to your <code>.bashrc</code> file, <code>make</code> will always run <code>reconfigure</code> automatically whenever the configure script has changed.</p>
 <p>You can also use <code>CONF_CHECK=ignore</code> to skip the check for a needed configure update. This might speed up the build, but comes at the risk of an incorrect build result. This is only recommended if you know what you're doing.</p>
-<p>From time to time, you will also need to modify the command line to <code>configure</code> due to changes. Use <code>make print-configure</code> to show the command line used for your current configuration.</p>
+<p>From time to time, you will also need to modify the command line to <code>configure</code> due to changes. Use <code>make print-configuration</code> to show the command line used for your current configuration.</p>
 <h3 id="using-fine-grained-make-targets">Using Fine-Grained Make Targets</h3>
 <p>The default behavior for make is to create consistent and correct output, at the expense of build speed, if necessary.</p>
 <p>If you are prepared to take some risk of an incorrect build, and know enough of the system to understand how things build and interact, you can speed up the build process considerably by instructing make to only build a portion of the product.</p>
@@ -859,14 +878,6 @@ sudo mv /tmp/configure /usr/local/bin</code></pre>
 <h4 id="rebuilding-part-of-java.base-jdk_filter">Rebuilding Part of java.base (JDK_FILTER)</h4>
 <p>If you are modifying files in <code>java.base</code>, which is the by far largest module in the JDK, then you need to rebuild all those files whenever a single file has changed. (This inefficiency will hopefully be addressed in JDK 10.)</p>
 <p>As a hack, you can use the make control variable <code>JDK_FILTER</code> to specify a pattern that will be used to limit the set of files being recompiled. For instance, <code>make java.base JDK_FILTER=javax/crypto</code> (or, to combine methods, <code>make java.base-java-only JDK_FILTER=javax/crypto</code>) will limit the compilation to files in the <code>javax.crypto</code> package.</p>
-<h3 id="learn-about-mercurial">Learn About Mercurial</h3>
-<p>To become an efficient JDK developer, it is recommended that you invest in learning Mercurial properly. Here are some links that can get you started:</p>
-<ul>
-<li><a href="http://www.mercurial-scm.org/wiki/GitConcepts">Mercurial for git users</a></li>
-<li><a href="http://www.mercurial-scm.org/wiki/Tutorial">The official Mercurial tutorial</a></li>
-<li><a href="http://hginit.com/">hg init</a></li>
-<li><a href="http://hgbook.red-bean.com/read/">Mercurial: The Definitive Guide</a></li>
-</ul>
 <h2 id="understanding-the-build-system">Understanding the Build System</h2>
 <p>This section will give you a more technical description on the details of the build system.</p>
 <h3 id="configurations">Configurations</h3>
--- a/doc/building.md
+++ b/doc/building.md
@@ -3,11 +3,11 @@
 ## TL;DR (Instructions for the Impatient)

 If you are eager to try out building the JDK, these simple steps works most of
-the time. They assume that you have installed Mercurial (and Cygwin if running
+the time. They assume that you have installed Git (and Cygwin if running
 on Windows) and cloned the top-level JDK repository that you want to build.

 1. [Get the complete source code](#getting-the-source-code): \
-    `hg clone http://hg.openjdk.java.net/jdk/jdk`
+    `git clone https://git.openjdk.java.net/jdk/`

 2. [Run configure](#running-configure): \
    `bash configure`
@@ -47,14 +47,14 @@ JDK.

 Make sure you are getting the correct version. As of JDK 10, the source is no
 longer split into separate repositories so you only need to clone one single
-repository. At the [OpenJDK Mercurial server](http://hg.openjdk.java.net/) you
+repository. At the [OpenJDK Git site](https://git.openjdk.java.net/) you
 can see a list of all available repositories. If you want to build an older version,
-e.g. JDK 8, it is recommended that you get the `jdk8u` forest, which contains
-incremental updates, instead of the `jdk8` forest, which was frozen at JDK 8 GA.
+e.g. JDK 11, it is recommended that you get the `jdk11u` repo, which contains
+incremental updates, instead of the `jdk11` repo, which was frozen at JDK 11 GA.

-If you are new to Mercurial, a good place to start is the [Mercurial Beginner's
-Guide](http://www.mercurial-scm.org/guide). The rest of this document assumes a
-working knowledge of Mercurial.
+If you are new to Git, a good place to start is the book [Pro
+Git](https://git-scm.com/book/en/v2). The rest of this document
+assumes a working knowledge of Git.

 ### Special Considerations

@@ -89,9 +89,21 @@ on where and how to check out the source code.
        directory. This is especially important if your user name contains
        spaces and/or mixed upper and lower case letters.

-      * Clone the JDK repository using the Cygwin command line `hg` client
-        as instructed in this document. That is, do *not* use another Mercurial
-        client such as TortoiseHg.
+      * You need to install a git client. You have two choices, Cygwin git or
+        Git for Windows. Unfortunately there are pros and cons with each choice.
+
+        * The Cygwin `git` client has no line ending issues and understands
+          Cygwin paths (which are used throughout the JDK build system).
+          However, it does not currently work well with the Skara CLI tooling.
+          Please see the [Skara wiki on Git clients](
+          https://wiki.openjdk.java.net/display/SKARA/Skara#Skara-Git) for
+          up-to-date information about the Skara git client support.
+
+        * The [Git for Windows](https://gitforwindows.org) client has issues
+          with line endings, and do not understand Cygwin paths. It does work
+          well with the Skara CLI tooling, however. To alleviate the line ending
+          problems, make sure you set `core.autocrlf` to `false` (this is asked
+          during installation).

    Failure to follow this procedure might result in hard-to-debug build
    problems.
@@ -173,7 +185,7 @@ likely be possible to support in a future version but that would require effort
 to implement.)

 Internally in the build system, all paths are represented as Unix-style paths,
-e.g. `/cygdrive/c/hg/jdk9/Makefile` rather than `C:\hg\jdk9\Makefile`. This
+e.g. `/cygdrive/c/git/jdk/Makefile` rather than `C:\git\jdk\Makefile`. This
 rule also applies to input to the build system, e.g. in arguments to
 `configure`. So, use `--with-msvcr-dll=/cygdrive/c/msvcr100.dll` rather than
 `--with-msvcr-dll=c:\msvcr100.dll`. For details on this conversion, see the section
@@ -273,6 +285,13 @@ For rpm-based distributions (Fedora, Red Hat, etc), try this:
 sudo yum groupinstall "Development Tools"
 ```

+For Alpine Linux, aside from basic tooling, install the GNU versions of some
+programs:
+
+```
+sudo apk add build-base bash grep zip
+```
+
 ### AIX

 Please consult the AIX section of the [Supported Build Platforms](
@@ -302,9 +321,9 @@ issues.

 Operating system   Toolchain version
 ------------------ -------------------------------------------------------
- Linux              gcc 9.2.0
+ Linux              gcc 10.2.0
 macOS              Apple Xcode 10.1 (using clang 10.0.0)
- Windows            Microsoft Visual Studio 2019 update 16.5.3
+ Windows            Microsoft Visual Studio 2019 update 16.7.2

 All compilers are expected to be able to compile to the C99 language standard,
 as some C99 features are used in the source code. Microsoft Visual Studio
@@ -316,7 +335,7 @@ features that it does support.
 The minimum accepted version of gcc is 5.0. Older versions will generate a warning
 by `configure` and are unlikely to work.

-The JDK is currently known to be able to compile with at least version 9.2 of
+The JDK is currently known to be able to compile with at least version 10.2 of
 gcc.

 In general, any version between these two should be usable.
@@ -363,6 +382,9 @@ If you have multiple versions of Visual Studio installed, `configure` will by
 default pick the latest. You can request a specific version to be used by
 setting `--with-toolchain-version`, e.g. `--with-toolchain-version=2017`.

+If you have Visual Studio installed but `configure` fails to detect it, it may
+be because of [spaces in path](#spaces-in-path).
+
 ### IBM XL C/C++

 Please consult the AIX section of the [Supported Build Platforms](
@@ -431,6 +453,7 @@ rather than bundling the JDK's own copy.
    libfreetype6-dev`.
  * To install on an rpm-based Linux, try running `sudo yum install
    freetype-devel`.
+  * To install on Alpine Linux, try running `sudo apk add freetype-dev`.

 Use `--with-freetype-include=<path>` and `--with-freetype-lib=<path>`
 if `configure` does not automatically locate the platform FreeType files.
@@ -445,6 +468,7 @@ your operating system.
    libcups2-dev`.
  * To install on an rpm-based Linux, try running `sudo yum install
    cups-devel`.
+  * To install on Alpine Linux, try running `sudo apk add cups-dev`.

 Use `--with-cups=<path>` if `configure` does not properly locate your CUPS
 files.
@@ -458,6 +482,8 @@ Linux.
    libx11-dev libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev`.
  * To install on an rpm-based Linux, try running `sudo yum install
    libXtst-devel libXt-devel libXrender-devel libXrandr-devel libXi-devel`.
+  * To install on Alpine Linux, try running `sudo apk add libx11-dev
+    libxext-dev libxrender-dev libxrandr-dev libxtst-dev libxt-dev`.

 Use `--with-x=<path>` if `configure` does not properly locate your X11 files.

@@ -470,6 +496,7 @@ required on Linux. At least version 0.9.1 of ALSA is required.
    libasound2-dev`.
  * To install on an rpm-based Linux, try running `sudo yum install
    alsa-lib-devel`.
+  * To install on Alpine Linux, try running `sudo apk add alsa-lib-dev`.

 Use `--with-alsa=<path>` if `configure` does not properly locate your ALSA
 files.
@@ -484,6 +511,7 @@ Hotspot.
    libffi-dev`.
  * To install on an rpm-based Linux, try running `sudo yum install
    libffi-devel`.
+  * To install on Alpine Linux, try running `sudo apk add libffi-dev`.

 Use `--with-libffi=<path>` if `configure` does not properly locate your libffi
 files.
@@ -499,6 +527,7 @@ platforms. At least version 2.69 is required.
    autoconf`.
  * To install on an rpm-based Linux, try running `sudo yum install
    autoconf`.
+  * To install on Alpine Linux, try running `sudo apk add autoconf`.
  * To install on macOS, try running `brew install autoconf`.
  * To install on Windows, try running `<path to Cygwin setup>/setup-x86_64 -q
    -P autoconf`.
@@ -627,7 +656,7 @@ features, use `bash configure --help=short` instead.)
 On Linux, BSD and AIX, it is possible to override where Java by default
 searches for runtime/JNI libraries. This can be useful in situations where
 there is a special shared directory for system JNI libraries. This setting
-can in turn be overriden at runtime by setting the `java.library.path` property.
+can in turn be overridden at runtime by setting the `java.library.path` property.

  * `--with-jni-libpath=<path>` - Use the specified path as a default
  when searching for runtime libraries.
@@ -693,7 +722,7 @@ hard to use properly. Therefore, `configure` will print a warning if this is
 detected.

 However, there are a few `configure` variables, known as *control variables*
-that are supposed to be overriden on the command line. These are variables that
+that are supposed to be overridden on the command line. These are variables that
 describe the location of tools needed by the build, like `MAKE` or `GREP`. If
 any such variable is specified, `configure` will use that value instead of
 trying to autodetect the tool. For instance, `bash configure
@@ -773,7 +802,7 @@ broken build. Unless you're well versed in the build system, this is hard to
 use properly. Therefore, `make` will print a warning if this is detected.

 However, there are a few `make` variables, known as *control variables* that
-are supposed to be overriden on the command line. These make up the "make time"
+are supposed to be overridden on the command line. These make up the "make time"
 configuration, as opposed to the "configure time" configuration.

 #### General Make Control Variables
@@ -1072,23 +1101,39 @@ for foreign architectures with native compilation speed.
 For example, cross-compiling to AArch64 from x86_64 could be done like this:

  * Install cross-compiler on the *build* system:
-```
-apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu
-```
+    ```
+    apt install g++-aarch64-linux-gnu gcc-aarch64-linux-gnu
+    ```

  * Create chroot on the *build* system, configuring it for *target* system:
-```
-sudo qemu-debootstrap --arch=arm64 --verbose \
-       --include=fakeroot,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng12-dev \
-       --resolve-deps jessie /chroots/arm64 http://httpredir.debian.org/debian/
-```
+    ```
+    sudo qemu-debootstrap \
+      --arch=arm64 \
+      --verbose \
+      --include=fakeroot,symlinks,build-essential,libx11-dev,libxext-dev,libxrender-dev,libxrandr-dev,libxtst-dev,libxt-dev,libcups2-dev,libfontconfig1-dev,libasound2-dev,libfreetype6-dev,libpng-dev \
+      --resolve-deps \
+      buster \
+      ~/sysroot-arm64 \
+      http://httpredir.debian.org/debian/
+    ```
+
+  * Make sure the symlinks inside the newly created chroot point to proper locations:
+    ```
+    sudo chroot ~/sysroot-arm64 symlinks -cr .
+    ```

  * Configure and build with newly created chroot as sysroot/toolchain-path:
-```
-CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure --openjdk-target=aarch64-linux-gnu --with-sysroot=/chroots/arm64/ --with-toolchain-path=/chroots/arm64/
-make images
-ls build/linux-aarch64-normal-server-release/
-```
+    ```
+    CC=aarch64-linux-gnu-gcc CXX=aarch64-linux-gnu-g++ sh ./configure \
+     --openjdk-target=aarch64-linux-gnu \
+     --with-sysroot=~/sysroot-arm64 \
+     --with-toolchain-path=~/sysroot-arm64 \
+     --with-freetype-lib=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/ \
+     --with-freetype-include=~/sysroot-arm64/usr/include/freetype2/ \
+     --x-libraries=~/sysroot-arm64/usr/lib/aarch64-linux-gnu/
+    make images
+    ls build/linux-aarch64-server-release/
+    ```

 The build does not create new files in that chroot, so it can be reused for multiple builds
 without additional cleanup.
@@ -1113,6 +1158,25 @@ available using `--with-abi-profile`: arm-vfp-sflt, arm-vfp-hflt, arm-sflt,
 armv5-vfp-sflt, armv6-vfp-hflt. Note that soft-float ABIs are no longer
 properly supported by the JDK.

+### Building for musl
+
+Just like it's possible to cross-compile for a different CPU, it's possible to
+cross-compile for musl libc on a glibc-based *build* system.
+A devkit suitable for most target CPU architectures can be obtained from
+[musl.cc](https://musl.cc). After installing the required packages in the
+sysroot, configure the build with `--openjdk-target`:
+
+```
+sh ./configure --with-jvm-variants=server \
+--with-boot-jdk=$BOOT_JDK \
+--with-build-jdk=$BUILD_JDK \
+--openjdk-target=x86_64-unknown-linux-musl \
+--with-devkit=$DEVKIT \
+--with-sysroot=$SYSROOT
+```
+
+and run `make` normally.
+
 ### Verifying the Build

 The build will end up in a directory named like
@@ -1237,14 +1301,14 @@ ERROR: Build failed for target 'hotspot' in configuration 'linux-x64' (exit code

 === Output from failing command(s) repeated here ===
 * For target hotspot_variant-server_libjvm_objs_psMemoryPool.o:
-/localhome/hg/jdk9-sandbox/hotspot/src/share/vm/services/psMemoryPool.cpp:1:1: error: 'failhere' does not name a type
+/localhome/git/jdk-sandbox/hotspot/src/share/vm/services/psMemoryPool.cpp:1:1: error: 'failhere' does not name a type
   ... (rest of output omitted)

-* All command lines available in /localhome/hg/jdk9-sandbox/build/linux-x64/make-support/failure-logs.
+* All command lines available in /localhome/git/jdk-sandbox/build/linux-x64/make-support/failure-logs.
 === End of repeated output ===

 === Make failed targets repeated here ===
-lib/CompileJvm.gmk:207: recipe for target '/localhome/hg/jdk9-sandbox/build/linux-x64/hotspot/variant-server/libjvm/objs/psMemoryPool.o' failed
+lib/CompileJvm.gmk:207: recipe for target '/localhome/git/jdk-sandbox/build/linux-x64/hotspot/variant-server/libjvm/objs/psMemoryPool.o' failed
 make/Main.gmk:263: recipe for target 'hotspot-server-libs' failed
 === End of repeated output ===

@@ -1342,7 +1406,7 @@ order. Most issues will be solved at step 1 or 2.

 1. Make sure your repository is up-to-date

-    Run `hg pull -u` to make sure you have the latest changes.
+    Run `git pull origin master` to make sure you have the latest changes.

 2. Clean build results

@@ -1367,13 +1431,13 @@ order. Most issues will be solved at step 1 or 2.
    make
    ```

- 4. Re-clone the Mercurial repository
+ 4. Re-clone the Git repository

-    Sometimes the Mercurial repository gets in a state that causes the product
+    Sometimes the Git repository gets in a state that causes the product
    to be un-buildable. In such a case, the simplest solution is often the
    "sledgehammer approach": delete the entire repository, and re-clone it.
    If you have local changes, save them first to a different location using
-    `hg export`.
+    `git format-patch`.

 ### Specific Build Issues

@@ -1405,6 +1469,15 @@ This can be a sign of a Cygwin problem. See the information about solving
 problems in the [Cygwin](#cygwin) section. Rebooting the computer might help
 temporarily.

+#### Spaces in Path
+
+On Windows, when configuring, `fixpath.sh` may report that some directory
+names have spaces. Usually, it assumes those directories have
+[short paths](https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/fsutil-8dot3name).
+You can run `fsutil file setshortname` in `cmd` on certain directories, such as
+`Microsoft Visual Studio` or `Windows Kits`, to assign arbitrary short paths so
+`configure` can access them.
+
 ### Getting Help

 If none of the suggestions in this document helps you, or if you find what you
@@ -1418,33 +1491,6 @@ contact the Adoption Group. See the section on [Contributing to OpenJDK](

 ## Hints and Suggestions for Advanced Users

-### Setting Up a Repository for Pushing Changes (defpath)
-
-To help you prepare a proper push path for a Mercurial repository, there exists
-a useful tool known as [defpath](
-http://openjdk.java.net/projects/code-tools/defpath). It will help you setup a
-proper push path for pushing changes to the JDK.
-
-Install the extension by cloning
-`http://hg.openjdk.java.net/code-tools/defpath` and updating your `.hgrc` file.
-Here's one way to do this:
-
-```
-cd ~
-mkdir hg-ext
-cd hg-ext
-hg clone http://hg.openjdk.java.net/code-tools/defpath
-cat << EOT >> ~/.hgrc
-[extensions]
-defpath=~/hg-ext/defpath/defpath.py
-EOT
-```
-
-You can now setup a proper push path using:
-```
-hg defpath -d -u <your OpenJDK username>
-```
-
 ### Bash Completion

 The `configure` and `make` commands tries to play nice with bash command-line
@@ -1510,8 +1556,8 @@ update. This might speed up the build, but comes at the risk of an incorrect
 build result. This is only recommended if you know what you're doing.

 From time to time, you will also need to modify the command line to `configure`
-due to changes. Use `make print-configure` to show the command line used for
-your current configuration.
+due to changes. Use `make print-configuration` to show the command line used
+for your current configuration.

 ### Using Fine-Grained Make Targets

@@ -1585,16 +1631,6 @@ instance, `make java.base JDK_FILTER=javax/crypto` (or, to combine methods,
 `make java.base-java-only JDK_FILTER=javax/crypto`) will limit the compilation
 to files in the `javax.crypto` package.

-### Learn About Mercurial
-
-To become an efficient JDK developer, it is recommended that you invest in
-learning Mercurial properly. Here are some links that can get you started:
-
-  * [Mercurial for git users](http://www.mercurial-scm.org/wiki/GitConcepts)
-  * [The official Mercurial tutorial](http://www.mercurial-scm.org/wiki/Tutorial)
-  * [hg init](http://hginit.com/)
-  * [Mercurial: The Definitive Guide](http://hgbook.red-bean.com/read/)
-
 ## Understanding the Build System

 This section will give you a more technical description on the details of the
--- a/doc/hotspot-style.html
+++ b/doc/hotspot-style.html
@@ -49,6 +49,7 @@
 <li><a href="#thread_local">thread_local</a></li>
 <li><a href="#nullptr">nullptr</a></li>
 <li><a href="#atomic">&lt;atomic&gt;</a></li>
+<li><a href="#uniform-initialization">Uniform Initialization</a></li>
 <li><a href="#additional-permitted-features">Additional Permitted Features</a></li>
 <li><a href="#excluded-features">Excluded Features</a></li>
 <li><a href="#undecided-features">Undecided Features</a></li>
@@ -275,6 +276,17 @@ while ( test_foo(args...) ) { // No, excess spaces around control</code></pre></
 <p>Do not use facilities provided by the <code>&lt;atomic&gt;</code> header (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2427.html">n2427</a>), (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2752.htm">n2752</a>); instead, use the HotSpot <code>Atomic</code> class and related facilities.</p>
 <p>Atomic operations in HotSpot code must have semantics which are consistent with those provided by the JDK's compilers for Java. There are platform-specific implementation choices that a C++ compiler might make or change that are outside the scope of the C++ Standard, and might differ from what the Java compilers implement.</p>
 <p>In addition, HotSpot <code>Atomic</code> has a concept of &quot;conservative&quot; memory ordering, which may differ from (may be stronger than) sequentially consistent. There are algorithms in HotSpot that are believed to rely on that ordering.</p>
+<h3 id="uniform-initialization">Uniform Initialization</h3>
+<p>The use of <em>uniform initialization</em> (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm">n2672</a>), also known as <em>brace initialization</em>, is permitted.</p>
+<p>Some relevant sections from cppreference.com:</p>
+<ul>
+<li><a href="https://en.cppreference.com/w/cpp/language/initialization">initialization</a></li>
+<li><a href="https://en.cppreference.com/w/cpp/language/value_initialization">value initialization</a></li>
+<li><a href="https://en.cppreference.com/w/cpp/language/direct_initialization">direct initialization</a></li>
+<li><a href="https://en.cppreference.com/w/cpp/language/list_initialization">list initialization</a></li>
+<li><a href="https://en.cppreference.com/w/cpp/language/aggregate_initialization">aggregate initialization</a></li>
+</ul>
+<p>Although related, the use of <code>std::initializer_list</code> remains forbidden, as part of the avoidance of the C++ Standard Library in HotSpot code.</p>
 <h3 id="additional-permitted-features">Additional Permitted Features</h3>
 <ul>
 <li><p><code>constexpr</code> (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">n2235</a>) (<a href="https://isocpp.org/files/papers/N3652.html">n3652</a>)</p></li>
@@ -292,6 +304,7 @@ while ( test_foo(args...) ) { // No, excess spaces around control</code></pre></
 <li><p>Dynamic initialization and destruction with concurrency (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">n2660</a>)</p></li>
 <li><p><code>final</code> virtual specifiers for classes and virtual functions (<a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2928.htm">n2928</a>), (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3206.htm">n3206</a>), (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3272.htm">n3272</a>)</p></li>
 <li><p>Local and unnamed types as template parameters (<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">n2657</a>)</p></li>
+<li><p>Range-based <code>for</code> loops (<a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html">n2930</a>) (<a href="https://en.cppreference.com/w/cpp/language/range-for">range-for</a>)</p></li>
 </ul>
 <h3 id="excluded-features">Excluded Features</h3>
 <ul>
--- a/doc/hotspot-style.md
+++ b/doc/hotspot-style.md
@@ -681,6 +681,23 @@ ordering, which may differ from (may be stronger than) sequentially
 consistent.  There are algorithms in HotSpot that are believed to rely
 on that ordering.

+### Uniform Initialization
+
+The use of _uniform initialization_
+([n2672](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2672.htm)),
+also known as _brace initialization_, is permitted.
+
+Some relevant sections from cppreference.com:
+
+* [initialization](https://en.cppreference.com/w/cpp/language/initialization)
+* [value initialization](https://en.cppreference.com/w/cpp/language/value_initialization)
+* [direct initialization](https://en.cppreference.com/w/cpp/language/direct_initialization)
+* [list initialization](https://en.cppreference.com/w/cpp/language/list_initialization)
+* [aggregate initialization](https://en.cppreference.com/w/cpp/language/aggregate_initialization)
+
+Although related, the use of `std::initializer_list` remains forbidden, as
+part of the avoidance of the C++ Standard Library in HotSpot code.
+
 ### Additional Permitted Features

 * `constexpr`
@@ -733,6 +750,10 @@ on that ordering.
 * Local and unnamed types as template parameters
 ([n2657](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm))

+* Range-based `for` loops
+([n2930](http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2930.html))
+([range-for](https://en.cppreference.com/w/cpp/language/range-for))
+
 ### Excluded Features

 * New string and character literals
--- a/jb/project/docker/Dockerfile
+++ b/jb/project/docker/Dockerfile
@@ -0,0 +1,13 @@
+# jetbrains/runtime:jbr15env
+FROM centos:7
+RUN yum -y install centos-release-scl
+RUN yum -y install devtoolset-8
+RUN yum -y install zip bzip2 unzip tar wget make autoconf automake libtool gcc gcc-c++ libstdc++-devel alsa-devel cups-devel xorg-x11-devel libjpeg62-devel giflib-devel freetype-devel file which libXtst-devel libXt-devel libXrender-devel alsa-lib-devel fontconfig-devel libXrandr-devel libXi-devel git
+# Install Java 15
+RUN wget  https://cdn.azul.com/zulu/bin/zulu15.27.17-ca-jdk15.0.0-linux_x64.tar.gz \
+-O - | tar xz -C /
+RUN mv /zulu15.27.17-ca-jdk15.0.0-linux_x64 /jdk15.0.0
+ENV PATH /opt/rh/devtoolset-8/root/usr/bin:$PATH
+RUN mkdir .git
+RUN git config user.email "builduser@jetbrains.com"
+RUN git config user.name "builduser"
--- a/jb/project/tools/common/scripts/common.sh
+++ b/jb/project/tools/common/scripts/common.sh
@@ -0,0 +1,54 @@
+VENDOR_NAME="JetBrains s.r.o."
+VENDOR_VERSION_STRING="JBR-${JBSDK_VERSION_WITH_DOTS}.${JDK_BUILD_NUMBER}-${build_number}"
+[ -z "$bundle_type" ] || VENDOR_VERSION_STRING="${VENDOR_VERSION_STRING}-${bundle_type}"
+
+do_reset_changes=0
+do_reset_dcevm=0
+HEAD_REVISION=0
+
+function do_exit() {
+  exit_code=$1
+  [ $do_reset_changes -eq 1 ] && git checkout HEAD modules.list src/java.desktop/share/classes/module-info.java
+  if [ $do_reset_dcevm -eq 1 ]; then
+    [ ! -z $HEAD_REVISION ] && git reset --hard $HEAD_REVISION
+  fi
+  exit "$exit_code"
+}
+
+function update_jsdk_mods() {
+  __jsdk=$1
+  __jcef_mods=$2
+  __orig_jsdk_mods=$3
+  __updated_jsdk_mods=$4
+  
+  # re-create java.desktop.jmod with updated module-info.class
+  tmp=.java.desktop.$$.tmp
+  mkdir "$tmp" || exit $?
+  "$__jsdk"/bin/jmod extract --dir "$tmp" "$__orig_jsdk_mods"/java.desktop.jmod || exit $?
+  "$__jsdk"/bin/javac \
+      --patch-module java.desktop="$__orig_jsdk_mods"/java.desktop.jmod \
+      --module-path "$__jcef_mods" -d "$tmp"/classes src/java.desktop/share/classes/module-info.java || exit $?
+  "$__jsdk"/bin/jmod \
+      create --class-path "$tmp"/classes --config "$tmp"/conf --header-files "$tmp"/include --legal-notice "$tmp"/legal --libs "$tmp"/lib \
+      java.desktop.jmod || exit $?
+  mv java.desktop.jmod "$__updated_jsdk_mods" || exit $?
+  rm -rf "$tmp"
+  
+  # re-create java.base.jmod with updated hashes
+  tmp=.java.base.$$.tmp
+  mkdir "$tmp" || exit $?
+  hash_modules=$("$JSDK"/bin/jmod describe "$__orig_jsdk_mods"/java.base.jmod | grep hashes | awk '{print $2}' | tr '\n' '|' | sed s/\|$//) || exit $?
+  "$__jsdk"/bin/jmod extract --dir "$tmp" "$__orig_jsdk_mods"/java.base.jmod || exit $?
+  rm "$__updated_jsdk_mods"/java.base.jmod || exit $? # temp exclude from path
+  "$__jsdk"/bin/jmod \
+      create --module-path "$__updated_jsdk_mods" --hash-modules "$hash_modules" \
+      --class-path "$tmp"/classes --cmds "$tmp"/bin --config "$tmp"/conf --header-files "$tmp"/include --legal-notice "$tmp"/legal --libs "$tmp"/lib \
+      java.base.jmod || exit $?
+  mv java.base.jmod "$__updated_jsdk_mods" || exit $?
+  rm -rf "$tmp"
+}
+
+function get_mods_list() {
+  __mods=$1
+  echo $(ls $__mods) | sed s/\.jmod/,/g | sed s/,$//g | sed s/' '//g
+}
--- a/jb/project/tools/linux/scripts/mkimages_aarch64.sh
+++ b/jb/project/tools/linux/scripts/mkimages_aarch64.sh
@@ -0,0 +1,84 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies the current version of OpenJDK e.g. 11_0_6
+#   JDK_BUILD_NUMBER - specifies the number of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+
+JBSDK_VERSION_WITH_DOTS=$(echo $JBSDK_VERSION | sed 's/_/\./g')
+
+source jb/project/tools/common/scripts/common.sh
+
+JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}
+
+[ -z "$bundle_type" ] && (git apply -p0 < jb/project/tools/patches/exclude_jcef_module.patch || exit $?)
+
+sh configure \
+  --disable-warnings-as-errors \
+  --with-debug-level=release \
+  --with-vendor-name="${VENDOR_NAME}" \
+  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+  --with-version-pre= \
+  --with-version-build=${JDK_BUILD_NUMBER} \
+  --with-version-opt=b${build_number} \
+  --with-boot-jdk=${BOOT_JDK} \
+  --enable-cds=yes || exit $?
+make clean CONF=linux-aarch64-server-release || exit $?
+make images CONF=linux-aarch64-server-release test-image || exit $?
+
+JBSDK=${JBRSDK_BASE_NAME}-linux-aarch64-b${build_number}
+BASE_DIR=build/linux-aarch64-server-release/images
+JSDK=${BASE_DIR}/jdk
+JBRSDK_BUNDLE=jbrsdk
+
+echo Fixing permissions
+chmod -R a+r $JSDK
+
+rm -rf $BASE_DIR/$JBRSDK_BUNDLE
+cp -r $JSDK $BASE_DIR/$JBRSDK_BUNDLE || exit $?
+
+echo Creating $JBSDK.tar.gz ...
+sed 's/JBR/JBRSDK/g' ${BASE_DIR}/${JBRSDK_BUNDLE}/release > release
+mv release ${BASE_DIR}/${JBRSDK_BUNDLE}/release
+
+tar -pcf $JBSDK.tar \
+  --exclude=*.debuginfo --exclude=demo --exclude=sample --exclude=man \
+  -C $BASE_DIR ${JBRSDK_BUNDLE} || exit $?
+gzip $JBSDK.tar || exit $?
+
+JBR_BUNDLE=jbr
+JBR_BASE_NAME=jbr-$JBSDK_VERSION
+rm -rf $BASE_DIR/$JBR_BUNDLE
+
+JBR=$JBR_BASE_NAME-linux-aarch64-b$build_number
+grep -v javafx modules.list | grep -v "jdk.internal.vm\|jdk.aot\|jcef" > modules.list.aarch64
+echo Running jlink....
+${JSDK}/bin/jlink \
+  --module-path ${JSDK}/jmods --no-man-pages --compress=2 \
+  --add-modules $(xargs < modules.list.aarch64 | sed s/" "//g | sed s/,$//g) \
+  --output ${BASE_DIR}/${JBR_BUNDLE} || exit $?
+
+echo Modifying release info ...
+grep -v \"^JAVA_VERSION\" ${JSDK}/release | grep -v \"^MODULES\" >> ${BASE_DIR}/${JBR_BUNDLE}/release
+
+echo Creating $JBR.tar.gz ...
+tar -pcf $JBR.tar -C $BASE_DIR ${JBR_BUNDLE} || exit $?
+gzip $JBR.tar || exit $?
+
+JBRSDK_TEST=$JBRSDK_BASE_NAME-linux-test-aarch64-b$build_number
+echo Creating $JBRSDK_TEST.tar.gz ...
+tar -pcf $JBRSDK_TEST.tar -C $BASE_DIR --exclude='test/jdk/demos' test || exit $?
+gzip $JBRSDK_TEST.tar || exit $?
--- a/jb/project/tools/linux/scripts/mkimages_x64.sh
+++ b/jb/project/tools/linux/scripts/mkimages_x64.sh
@@ -0,0 +1,137 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies major version of OpenJDK e.g. 11_0_6 (instead of dots '.' underbars "_" are used)
+#   JDK_BUILD_NUMBER - specifies update release of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#   bundle_type      - specifies bundle to be built; possible values:
+#                        <empty> or nomod - the release bundles without any additional modules (jcef)
+#                        jcef - the release bundles with jcef
+#                        fd - the fastdebug bundles which also include the jcef module
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+# Environment variables:
+#   JCEF_PATH - specifies the path to the directory with JCEF binaries.
+#               By default JCEF binaries should be located in ./jcef_linux_x64
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+bundle_type=$4
+JBSDK_VERSION_WITH_DOTS=$(echo $JBSDK_VERSION | sed 's/_/\./g')
+JCEF_PATH=${JCEF_PATH:=./jcef_linux_x64}
+
+source jb/project/tools/common/scripts/common.sh
+
+function create_image_bundle {
+  __bundle_name=$1
+  __arch_name=$2
+  __modules_path=$3
+  __modules=$4
+
+  [ "$bundle_type" == "fd" ] && fastdebug_infix="fastdebug-"
+  JBR=${__bundle_name}-${JBSDK_VERSION}-linux-x64-${fastdebug_infix}b${build_number}
+
+  echo Running jlink....
+  [ -d "$IMAGES_DIR"/"$__arch_name" ] && rm -rf "${IMAGES_DIR:?}"/"$__arch_name"
+  $JSDK/bin/jlink \
+    --module-path "$__modules_path" --no-man-pages --compress=2 \
+    --add-modules "$__modules" --output "$IMAGES_DIR"/"$__arch_name"
+
+  grep -v "^JAVA_VERSION" "$JSDK"/release | grep -v "^MODULES" >> "$IMAGES_DIR"/"$__arch_name"/release
+  if [ "$__bundle_name" == "$JBRSDK_BUNDLE" ]; then
+    sed 's/JBR/JBRSDK/g' "$IMAGES_DIR"/"$__arch_name"/release > release
+    mv release "$IMAGES_DIR"/"$__arch_name"/release
+  fi
+
+  # jmod does not preserve file permissions (JDK-8173610)
+  [ -f "$IMAGES_DIR"/"$__arch_name"/lib/jcef_helper ] && chmod a+x "$IMAGES_DIR"/"$__arch_name"/lib/jcef_helper
+
+  echo Creating "$JBR".tar.gz ...
+  tar -pcf "$JBR".tar -C "$IMAGES_DIR" "$__arch_name" || do_exit $?
+  [ -f "$JBR".tar.gz ] && rm "$JBR.tar.gz"
+  gzip "$JBR".tar || do_exit $?
+  rm -rf "${IMAGES_DIR:?}"/"$__arch_name"
+}
+
+WITH_DEBUG_LEVEL="--with-debug-level=release"
+RELEASE_NAME=linux-x86_64-server-release
+
+case "$bundle_type" in
+  "jcef")
+    do_reset_changes=1
+    ;;
+  "dcevm")
+    HEAD_REVISION=$(git rev-parse HEAD)
+    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
+    do_reset_dcevm=1
+    do_reset_changes=1
+    ;;
+  "nomod" | "")
+    bundle_type=""
+    ;;
+  "fd")
+    do_reset_changes=1
+    WITH_DEBUG_LEVEL="--with-debug-level=fastdebug"
+    RELEASE_NAME=linux-x86_64-server-fastdebug
+    ;;
+esac
+
+sh configure \
+  --disable-warnings-as-errors \
+  $WITH_DEBUG_LEVEL \
+  --with-vendor-name="$VENDOR_NAME" \
+  --with-vendor-version-string="$VENDOR_VERSION_STRING" \
+  --with-version-pre= \
+  --with-version-build="$JDK_BUILD_NUMBER" \
+  --with-version-opt=b"$build_number" \
+  --with-boot-jdk="$BOOT_JDK" \
+  --enable-cds=yes || do_exit $?
+
+make clean CONF=$RELEASE_NAME || exit $?
+make images CONF=$RELEASE_NAME || do_exit $?
+
+IMAGES_DIR=build/$RELEASE_NAME/images
+JSDK=$IMAGES_DIR/jdk
+JSDK_MODS_DIR=$IMAGES_DIR/jmods
+JBRSDK_BUNDLE=jbrsdk
+
+echo Fixing permissions
+chmod -R a+r $JSDK
+
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+  git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
+  update_jsdk_mods $JSDK $JCEF_PATH/jmods $JSDK/jmods $JSDK_MODS_DIR || do_exit $?
+  cp $JCEF_PATH/jmods/* $JSDK_MODS_DIR # $JSDK/jmods is not changed
+
+  jbr_name_postfix="_${bundle_type}"
+fi
+
+# create runtime image bundle
+modules=$(xargs < modules.list | sed s/" "//g) || do_exit $?
+create_image_bundle "jbr${jbr_name_postfix}" "jbr" $JSDK_MODS_DIR "$modules" || do_exit $?
+
+# create sdk image bundle
+modules=$(cat $JSDK/release | grep MODULES | sed s/MODULES=//g | sed s/' '/,/g | sed s/\"//g | sed s/\\n//g) || do_exit $?
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
+  modules=${modules},$(get_mods_list "$JCEF_PATH"/jmods)
+fi
+create_image_bundle $JBRSDK_BUNDLE $JBRSDK_BUNDLE $JSDK_MODS_DIR "$modules" || do_exit $?
+
+if [ -z "$bundle_type" ]; then
+    JBRSDK_TEST=${JBRSDK_BUNDLE}-${JBSDK_VERSION}-linux-test-x64-b${build_number}
+    echo Creating "$JBRSDK_TEST" ...
+    make test-image CONF=$RELEASE_NAME || do_exit $?
+    tar -pcf "$JBRSDK_TEST".tar -C $IMAGES_DIR --exclude='test/jdk/demos' test || do_exit $?
+    [ -f "$JBRSDK_TEST.tar.gz" ] && rm "$JBRSDK_TEST.tar.gz"
+    gzip "$JBRSDK_TEST".tar || do_exit $?
+fi
+
+do_exit 0
--- a/jb/project/tools/linux/scripts/mkimages_x86.sh
+++ b/jb/project/tools/linux/scripts/mkimages_x86.sh
@@ -0,0 +1,81 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies the current version of OpenJDK e.g. 11_0_6
+#   JDK_BUILD_NUMBER - specifies the number of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+
+JBSDK_VERSION_WITH_DOTS=$(echo $JBSDK_VERSION | sed 's/_/\./g')
+
+source jb/project/tools/common/scripts/common.sh
+
+JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}
+
+[ -z "$bundle_type" ] && (git apply -p0 < jb/project/tools/patches/exclude_jcef_module.patch || exit $?)
+
+linux32 bash configure \
+  --disable-warnings-as-errors \
+  --with-debug-level=release \
+  --with-vendor-name="${VENDOR_NAME}" \
+  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+  --with-version-pre= \
+  --with-version-build=$JDK_BUILD_NUMBER \
+  --with-version-opt=b${build_number} \
+  --with-boot-jdk=${BOOT_JDK} \
+  --enable-cds=yes || exit $?
+make clean CONF=linux-x86-server-release || exit $?
+make images CONF=linux-x86-server-release test-image || exit $?
+
+JBSDK=${JBRSDK_BASE_NAME}-linux-x86-b${build_number}
+BASE_DIR=build/linux-x86-server-release/images
+JSDK=${BASE_DIR}/jdk
+JBRSDK_BUNDLE=jbrsdk
+
+echo Fixing permissions
+chmod -R a+r $JSDK
+
+rm -rf $BASE_DIR/$JBRSDK_BUNDLE
+cp -r $JSDK $BASE_DIR/$JBRSDK_BUNDLE || exit $?
+
+echo Creating $JBSDK.tar.gz ...
+sed 's/JBR/JBRSDK/g' ${BASE_DIR}/${JBRSDK_BUNDLE}/release > release
+mv release ${BASE_DIR}/${JBRSDK_BUNDLE}/release
+
+tar -pcf $JBSDK.tar --exclude=*.debuginfo --exclude=demo --exclude=sample --exclude=man -C $BASE_DIR ${JBRSDK_BUNDLE} || exit $?
+gzip $JBSDK.tar || exit $?
+
+JBR_BUNDLE=jbr
+JBR_BASE_NAME=jbr-$JBSDK_VERSION
+rm -rf $BASE_DIR/$JBR_BUNDLE
+
+JBR=$JBR_BASE_NAME-linux-x86-b$build_number
+grep -v javafx modules.list | grep -v "jdk.internal.vm\|jdk.aot\|jcef" > modules.list.x86
+echo Running jlink....
+${JSDK}/bin/jlink \
+  --module-path ${JSDK}/jmods --no-man-pages --compress=2 \
+  --add-modules $(xargs < modules.list.x86 | sed s/" "//g | sed s/,$//g) --output ${BASE_DIR}/${JBR_BUNDLE} || exit $?
+
+echo Modifying release info ...
+grep -v \"^JAVA_VERSION\" ${JSDK}/release | grep -v \"^MODULES\" >> ${BASE_DIR}/${JBR_BUNDLE}/release
+
+echo Creating $JBR.tar.gz ...
+tar -pcf $JBR.tar -C $BASE_DIR $JBR_BUNDLE || exit $?
+gzip $JBR.tar || exit $?
+
+JBRSDK_TEST=$JBRSDK_BASE_NAME-linux-test-x86-b$build_number
+echo Creating $JBRSDK_TEST.tar.gz ...
+tar -pcf $JBRSDK_TEST.tar -C $BASE_DIR --exclude='test/jdk/demos' --exclude='test/hotspot/gtest' test || exit $?
+gzip $JBRSDK_TEST.tar || exit $?
--- a/jb/project/tools/mac/scripts/entitlements.xml
+++ b/jb/project/tools/mac/scripts/entitlements.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <dict>
+        <key>com.apple.security.cs.allow-jit</key>
+        <true/>
+        <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
+        <true/>
+        <key>com.apple.security.cs.allow-dyld-environment-variables</key>
+        <true/>
+        <key>com.apple.security.cs.disable-library-validation</key>
+        <true/>
+        <key>com.apple.security.cs.disable-executable-page-protection</key>
+        <true/>
+    </dict>
+</plist>
--- a/jb/project/tools/mac/scripts/mkimages.sh
+++ b/jb/project/tools/mac/scripts/mkimages.sh
@@ -0,0 +1,139 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies major version of OpenJDK e.g. 11_0_6 (instead of dots '.' underbars "_" are used)
+#   JDK_BUILD_NUMBER - specifies update release of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#   bundle_type      - specifies bundle to be built; possible values:
+#                        <empty> or nomod - the release bundles without any additional modules (jcef)
+#                        jcef - the release bundles with jcef
+#                        fd - the fastdebug bundles which also include the jcef module
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+# Environment variables:
+#   JCEF_PATH - specifies the path to the directory with JCEF binaries.
+#               By default JCEF binaries should be located in ./jcef_mac
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+bundle_type=$4
+JBSDK_VERSION_WITH_DOTS=$(echo "$JBSDK_VERSION" | sed 's/_/\./g')
+JCEF_PATH=${JCEF_PATH:=./jcef_mac}
+MAJOR_JBSDK_VERSION=$(echo "$JBSDK_VERSION_WITH_DOTS" | awk -F "." '{print $1}')
+BOOT_JDK=${BOOT_JDK:=$(/usr/libexec/java_home -v 14)}
+
+source jb/project/tools/common/scripts/common.sh
+
+function create_image_bundle {
+  __bundle_name=$1
+  __arch_name=$2
+  __modules_path=$3
+  __modules=$4
+
+  tmp=.bundle.$$.tmp
+  mkdir "$tmp" || do_exit $?
+
+  [ "$bundle_type" == "fd" ] && fastdebug_infix="fastdebug-"
+  JBR=${__bundle_name}-${JBSDK_VERSION}-osx-x64-${fastdebug_infix}b${build_number}
+
+  JRE_CONTENTS=$tmp/$__arch_name/Contents
+  mkdir -p "$JRE_CONTENTS" || do_exit $?
+
+  echo Running jlink...
+  "$JSDK"/bin/jlink \
+    --module-path "$__modules_path" --no-man-pages --compress=2 \
+    --add-modules "$__modules" --output "$JRE_CONTENTS/Home" || do_exit $?
+
+  grep -v "^JAVA_VERSION" "$JSDK"/release | grep -v "^MODULES" >> "$JRE_CONTENTS/Home/release"
+  if [ "$__bundle_name" == "$JBRSDK_BUNDLE" ]; then
+    sed 's/JBR/JBRSDK/g' $JRE_CONTENTS/Home/release > release
+    mv release $JRE_CONTENTS/Home/release
+  fi
+
+  cp -R "$JSDK"/../MacOS "$JRE_CONTENTS"
+  cp "$JSDK"/../Info.plist "$JRE_CONTENTS"
+  [ -n "$bundle_type" ] && (cp -a $JCEF_PATH/Frameworks "$JRE_CONTENTS" || do_exit $?)
+
+  echo Creating "$JBR".tar.gz ...
+  COPYFILE_DISABLE=1 tar -pczf "$JBR".tar.gz --exclude='*.dSYM' --exclude='man' -C "$tmp" "$__arch_name" || do_exit $?
+  rm -rf "$tmp"
+}
+
+WITH_DEBUG_LEVEL="--with-debug-level=release"
+RELEASE_NAME=macosx-x86_64-server-release
+
+case "$bundle_type" in
+  "jcef")
+    do_reset_changes=1
+    ;;
+  "dcevm")
+    HEAD_REVISION=$(git rev-parse HEAD)
+    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
+    do_reset_dcevm=1
+    do_reset_changes=1
+    ;;
+  "nomod" | "")
+    bundle_type=""
+    ;;
+  "fd")
+    do_reset_changes=1
+    WITH_DEBUG_LEVEL="--with-debug-level=fastdebug"
+    RELEASE_NAME=macosx-x86_64-server-fastdebug
+    ;;
+esac
+
+sh configure \
+  --disable-warnings-as-errors \
+  $WITH_DEBUG_LEVEL \
+  --with-vendor-name="$VENDOR_NAME" \
+  --with-vendor-version-string="$VENDOR_VERSION_STRING" \
+  --with-version-pre= \
+  --with-version-build="$JDK_BUILD_NUMBER" \
+  --with-version-opt=b"$build_number" \
+  --with-boot-jdk="$BOOT_JDK" \
+  --enable-cds=yes || do_exit $?
+
+make clean CONF=$RELEASE_NAME || do_exit $?
+make images CONF=$RELEASE_NAME || do_exit $?
+
+IMAGES_DIR=build/$RELEASE_NAME/images
+JSDK=$IMAGES_DIR/jdk-bundle/jdk-$MAJOR_JBSDK_VERSION.jdk/Contents/Home
+JSDK_MODS_DIR=$IMAGES_DIR/jmods
+JBRSDK_BUNDLE=jbrsdk
+
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+  git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
+  update_jsdk_mods "$JSDK" "$JCEF_PATH"/jmods "$JSDK"/jmods "$JSDK_MODS_DIR" || do_exit $?
+  cp $JCEF_PATH/jmods/* $JSDK_MODS_DIR # $JSDK/jmods is not changed
+
+  jbr_name_postfix="_${bundle_type}"
+fi
+
+# create runtime image bundle
+modules=$(xargs < modules.list | sed s/" "//g) || do_exit $?
+create_image_bundle "jbr${jbr_name_postfix}" "jbr" $JSDK_MODS_DIR "$modules" || do_exit $?
+
+# create sdk image bundle
+modules=$(cat "$JSDK"/release | grep MODULES | sed s/MODULES=//g | sed s/' '/,/g | sed s/\"//g | sed s/\\n//g) || do_exit $?
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
+  modules=${modules},$(get_mods_list "$JCEF_PATH"/jmods)
+fi
+create_image_bundle "$JBRSDK_BUNDLE" "$JBRSDK_BUNDLE" "$JSDK_MODS_DIR" "$modules" || do_exit $?
+
+if [ -z "$bundle_type" ]; then
+    JBRSDK_TEST=${JBRSDK_BUNDLE}-${JBSDK_VERSION}-osx-test-x64-b${build_number}
+    echo Creating "$JBRSDK_TEST" ...
+    make test-image CONF=$RELEASE_NAME || do_exit $?
+    [ -f "$JBRSDK_TEST.tar.gz" ] && rm "$JBRSDK_TEST.tar.gz"
+    COPYFILE_DISABLE=1 tar -pczf "$JBRSDK_TEST".tar.gz -C $IMAGES_DIR --exclude='test/jdk/demos' test || do_exit $?
+fi
+
+do_exit 0
--- a/jb/project/tools/mac/scripts/notarize.sh
+++ b/jb/project/tools/mac/scripts/notarize.sh
@@ -0,0 +1,120 @@
+#!/bin/bash
+
+APP_DIRECTORY=$1
+APPL_USER=$2
+APPL_PASSWORD=$3
+APP_NAME=$4
+BUNDLE_ID=$5
+FAKE_ROOT="${6:-fake-root}"
+
+if [[ -z "$APP_DIRECTORY" ]] || [[ -z "$APPL_USER" ]] || [[ -z "$APPL_PASSWORD" ]]; then
+  echo "Usage: $0 AppDirectory Username Password"
+  exit 1
+fi
+if [[ ! -d "$APP_DIRECTORY" ]]; then
+  echo "AppDirectory '$APP_DIRECTORY' does not exist or not a directory"
+  exit 1
+fi
+
+function log() {
+  echo "$(date '+[%H:%M:%S]') $*"
+}
+
+function publish-log() {
+  id=$1
+  file=$2
+  curl -T "$file" "$ARTIFACTORY_URL/$id" || true
+}
+
+function altool-upload() {
+  # Since altool uses same file for upload token we have to trick it into using different folders for token file location
+  # Also it copies zip into TMPDIR so we override it too, to simplify cleanup
+  OLD_HOME="$HOME"
+  export HOME="$FAKE_ROOT/home"
+  export TMPDIR="$FAKE_ROOT/tmp"
+  mkdir -p "$HOME"
+  mkdir -p "$TMPDIR"
+  export _JAVA_OPTIONS="-Duser.home=$HOME -Djava.io.tmpdir=$TMPDIR"
+  # Reduce amount of downloads, cache transporter libraries
+  shared_itmstransporter="$OLD_HOME/shared-itmstransporter"
+  if [[ -f "$shared_itmstransporter" ]]; then
+    cp -r "$shared_itmstransporter" "$HOME/.itmstransporter"
+  fi
+  # For some reason altool prints everything to stderr, not stdout
+  set +e
+  xcrun altool --notarize-app \
+    --username "$APPL_USER" --password "$APPL_PASSWORD" \
+    --primary-bundle-id "$BUNDLE_ID" \
+    --asc-provider JetBrainssro --file "$1" 2>&1 | tee "altool.init.out"
+  unset TMPDIR
+  export HOME="$OLD_HOME"
+  set -e
+}
+
+#immediately exit script with an error if a command fails
+set -euo pipefail
+
+file="$APP_NAME.zip"
+
+log "Zipping $file..."
+rm -rf "$file"
+ditto -c -k --sequesterRsrc --keepParent "$APP_DIRECTORY/Contents" "$file"
+
+log "Notarizing $file..."
+rm -rf "altool.init.out" "altool.check.out"
+altool-upload "$file"
+
+rm -rf "$file"
+
+notarization_info="$(grep -e "RequestUUID" "altool.init.out" | grep -oE '([0-9a-f-]{36})')"
+
+if [ -z "$notarization_info" ]; then
+  log "Faile to read RequestUUID from altool.init.out"
+  exit 10
+fi
+
+PATH="$PATH:/usr/local/bin/"
+
+log "Notarization request sent, awaiting response"
+spent=0
+
+while true; do
+  # For some reason altool prints everything to stderr, not stdout
+  xcrun altool --username "$APPL_USER" --notarization-info "$notarization_info" --password "$APPL_PASSWORD" >"altool.check.out" 2>&1 || true
+  status="$(grep -oe 'Status: .*' "altool.check.out" | cut -c 9- || true)"
+  log "Current status: $status"
+  if [ "$status" = "invalid" ]; then
+    log "Notarization failed"
+    ec=1
+  elif [ "$status" = "success" ]; then
+    log "Notarization succeeded"
+    ec=0
+  else
+    if [ "$status" != "in progress" ]; then
+      log "Unknown notarization status, waiting more, altool output:"
+      cat "altool.check.out"
+    fi
+    if [[ $spent -gt 60 ]]; then
+      log "Waiting time out (apx 60 minutes)"
+      ec=2
+      break
+    fi
+    sleep 60
+    ((spent += 1))
+    continue
+  fi
+  developer_log="developer_log.json"
+  log "Fetching $developer_log"
+  # TODO: Replace cut with trim or something better
+  url="$(grep -oe 'LogFileURL: .*' "altool.check.out" | cut -c 13-)"
+  wget "$url" -O "$developer_log" && cat "$developer_log" || true
+  if [ $ec != 0 ]; then
+    log "Publishing $developer_log"
+    publish-log "$notarization_info" "$developer_log"
+  fi
+  break
+done
+cat "altool.check.out"
+
+rm -rf "altool.init.out" "altool.check.out"
+exit $ec
--- a/jb/project/tools/mac/scripts/sign.sh
+++ b/jb/project/tools/mac/scripts/sign.sh
@@ -0,0 +1,94 @@
+#!/bin/bash
+
+APP_DIRECTORY=$1
+JB_CERT=$2
+
+if [[ -z "$APP_DIRECTORY" ]] || [[ -z "$JB_CERT" ]]; then
+  echo "Usage: $0 AppDirectory CertificateID"
+  exit 1
+fi
+if [[ ! -d "$APP_DIRECTORY" ]]; then
+  echo "AppDirectory '$APP_DIRECTORY' does not exist or not a directory"
+  exit 1
+fi
+
+function log() {
+  echo "$(date '+[%H:%M:%S]') $*"
+}
+
+#immediately exit script with an error if a command fails
+set -euo pipefail
+
+# Cleanup files left from previous sign attempt (if any)
+find "$APP_DIRECTORY" -name '*.cstemp' -exec rm '{}' \;
+
+log "Signing libraries and executables..."
+# -perm +111 searches for executables
+for f in \
+   "Contents/Home/bin" \
+   "Contents/Home/lib" \
+   "Contents/Frameworks"; do
+  if [ -d "$APP_DIRECTORY/$f" ]; then
+    find "$APP_DIRECTORY/$f" \
+      -type f \( -name "*.jnilib" -o -name "*.dylib" -o -name "*.so" -o -perm +111 \) \
+      -exec codesign --timestamp \
+      -v -s "$JB_CERT" --options=runtime \
+      --entitlements entitlements.xml {} \;
+  fi
+done
+
+log "Signing libraries in jars in $PWD"
+
+# todo: add set -euo pipefail; into the inner sh -c
+# `-e` prevents `grep -q && printf` loginc
+# with `-o pipefail` there's no input for 'while' loop
+find "$APP_DIRECTORY" -name '*.jar' \
+  -exec sh -c "set -u; unzip -l \"\$0\" | grep -q -e '\.dylib\$' -e '\.jnilib\$' -e '\.so\$' -e '^jattach\$' && printf \"\$0\0\" " {} \; |
+  while IFS= read -r -d $'\0' file; do
+    log "Processing libraries in $file"
+
+    rm -rf jarfolder jar.jar
+    mkdir jarfolder
+    filename="${file##*/}"
+    log "Filename: $filename"
+    cp "$file" jarfolder && (cd jarfolder && jar xf "$filename" && rm "$filename")
+
+    find jarfolder \
+      -type f \( -name "*.jnilib" -o -name "*.dylib" -o -name "*.so" -o -name "jattach" \) \
+      -exec codesign --timestamp \
+      -v -s "$JB_CERT" --options=runtime \
+      --entitlements entitlements.xml {} \;
+
+    (cd jarfolder; zip -q -r -o ../jar.jar .)
+    mv jar.jar "$file"
+  done
+
+rm -rf jarfolder jar.jar
+
+log "Signing other files..."
+for f in \
+  "Contents/MacOS"; do
+  if [ -d "$APP_DIRECTORY/$f" ]; then
+    find "$APP_DIRECTORY/$f" \
+      -type f \( -name "*.jnilib" -o -name "*.dylib" -o -name "*.so" -o -perm +111 \) \
+      -exec codesign --timestamp \
+      -v -s "$JB_CERT" --options=runtime \
+      --entitlements entitlements.xml {} \;
+  fi
+done
+
+#log "Signing executable..."
+#codesign --timestamp \
+#    -v -s "$JB_CERT" --options=runtime \
+#    --force \
+#    --entitlements entitlements.xml "$APP_DIRECTORY/Contents/MacOS/idea"
+
+log "Signing whole app..."
+codesign --timestamp \
+  -v -s "$JB_CERT" --options=runtime \
+  --force \
+  --entitlements entitlements.xml "$APP_DIRECTORY"
+
+log "Verifying java is not broken"
+find "$APP_DIRECTORY" \
+  -type f -name 'java' -perm +111 -exec {} -version \;
--- a/jb/project/tools/mac/scripts/signapp.sh
+++ b/jb/project/tools/mac/scripts/signapp.sh
@@ -0,0 +1,138 @@
+#!/bin/bash
+
+#immediately exit script with an error if a command fails
+set -euo pipefail
+
+export COPY_EXTENDED_ATTRIBUTES_DISABLE=true
+export COPYFILE_DISABLE=true
+
+INPUT_FILE=$1
+EXPLODED=$2.exploded
+BACKUP_JMODS=$2.backup
+USERNAME=$3
+PASSWORD=$4
+CODESIGN_STRING=$5
+NOTARIZE=$6
+BUNDLE_ID=$7
+
+cd "$(dirname "$0")"
+
+function log() {
+  echo "$(date '+[%H:%M:%S]') $*"
+}
+
+log "Deleting $EXPLODED ..."
+if test -d "$EXPLODED"; then
+  find "$EXPLODED" -mindepth 1 -maxdepth 1 -exec chmod -R u+wx '{}' \;
+fi
+rm -rf "$EXPLODED"
+mkdir "$EXPLODED"
+rm -rf "$BACKUP_JMODS"
+mkdir "$BACKUP_JMODS"
+
+log "Unzipping $INPUT_FILE to $EXPLODED ..."
+tar -xzvf "$INPUT_FILE" --directory $EXPLODED
+rm "$INPUT_FILE"
+BUILD_NAME="$(ls "$EXPLODED")"
+if test -d $EXPLODED/$BUILD_NAME/Contents/Home/jmods; then
+  mv $EXPLODED/$BUILD_NAME/Contents/Home/jmods $BACKUP_JMODS
+fi
+if test -f $EXPLODED/$BUILD_NAME/Contents/MacOS/libjli.dylib; then
+  mv $EXPLODED/$BUILD_NAME/Contents/MacOS/libjli.dylib $BACKUP_JMODS
+fi
+if test -d $EXPLODED/$BUILD_NAME/Contents/Home/Frameworks; then
+  mv $EXPLODED/$BUILD_NAME/Contents/Home/Frameworks $BACKUP_JMODS
+fi
+
+log "$INPUT_FILE extracted and removed"
+
+APPLICATION_PATH="$EXPLODED/$BUILD_NAME"
+
+find "$APPLICATION_PATH/Contents/Home/bin" \
+  -maxdepth 1 -type f -name '*.jnilib' -print0 |
+  while IFS= read -r -d $'\0' file; do
+    if [ -f "$file" ]; then
+      log "Linking $file"
+      b="$(basename "$file" .jnilib)"
+      ln -sf "$b.jnilib" "$(dirname "$file")/$b.dylib"
+    fi
+  done
+
+find "$APPLICATION_PATH/Contents/" \
+  -maxdepth 1 -type f -name '*.txt' -print0 |
+  while IFS= read -r -d $'\0' file; do
+    if [ -f "$file" ]; then
+      log "Moving $file"
+      mv "$file" "$APPLICATION_PATH/Contents/Resources"
+    fi
+  done
+
+non_plist=$(find "$APPLICATION_PATH/Contents/" -maxdepth 1 -type f -and -not -name 'Info.plist' | wc -l)
+if [[ $non_plist -gt 0 ]]; then
+  log "Only Info.plist file is allowed in Contents directory but found $non_plist file(s):"
+  log "$(find "$APPLICATION_PATH/Contents/" -maxdepth 1 -type f -and -not -name 'Info.plist')"
+  exit 1
+fi
+
+log "Unlocking keychain..."
+# Make sure *.p12 is imported into local KeyChain
+security unlock-keychain -p "$PASSWORD" "/Users/$USERNAME/Library/Keychains/login.keychain"
+
+attempt=1
+limit=3
+set +e
+while [[ $attempt -le $limit ]]; do
+  log "Signing (attempt $attempt) $APPLICATION_PATH ..."
+  ./sign.sh "$APPLICATION_PATH" "$CODESIGN_STRING"
+  ec=$?
+  if [[ $ec -ne 0 ]]; then
+    ((attempt += 1))
+    if [ $attempt -eq $limit ]; then
+      set -e
+    fi
+    log "Signing failed, wait for 30 sec and try to sign again"
+    sleep 30
+  else
+    log "Signing done"
+    codesign -v "$APPLICATION_PATH" -vvvvv
+    log "Check sign done"
+    ((attempt += limit))
+  fi
+done
+
+set -e
+
+if [ "$NOTARIZE" = "yes" ]; then
+  log "Notarizing..."
+  # shellcheck disable=SC1090
+  source "$HOME/.notarize_token"
+  APP_NAME=$(echo ${INPUT_FILE} | awk -F"." '{ print $1 }')
+  # Since notarization tool uses same file for upload token we have to trick it into using different folders, hence fake root
+  # Also it leaves copy of zip file in TMPDIR, so notarize.sh overrides it and uses FAKE_ROOT as location for temp TMPDIR
+  FAKE_ROOT="$(pwd)/fake-root"
+  mkdir -p "$FAKE_ROOT"
+  echo "Notarization will use fake root: $FAKE_ROOT"
+  ./notarize.sh "$APPLICATION_PATH" "$APPLE_USERNAME" "$APPLE_PASSWORD" "$APP_NAME" "$BUNDLE_ID" "$FAKE_ROOT"
+  rm -rf "$FAKE_ROOT"
+
+  set +e
+  log "Stapling..."
+  xcrun stapler staple "$APPLICATION_PATH"
+else
+  log "Notarization disabled"
+  log "Stapling disabled"
+fi
+
+log "Zipping $BUILD_NAME to $INPUT_FILE ..."
+(
+  #cd "$EXPLODED"
+  #ditto -c -k --sequesterRsrc --keepParent "$BUILD_NAME" "../$INPUT_FILE"
+  if test -d $BACKUP_JMODS/jmods; then
+    mv $BACKUP_JMODS/jmods $EXPLODED/$BUILD_NAME/Contents/Home
+  fi
+
+  COPYFILE_DISABLE=1 tar -pczf $INPUT_FILE --exclude='*.dSYM' --exclude='man' -C $EXPLODED $BUILD_NAME
+  log "Finished zipping"
+)
+rm -rf "$EXPLODED"
+log "Done"
--- a/jb/project/tools/patches/add_jcef_module.patch
+++ b/jb/project/tools/patches/add_jcef_module.patch
@@ -0,0 +1,30 @@
+diff --git modules.list modules.list
+index 7c4b3e9cb6d..5ed60349ca7 100644
+--- modules.list
+++ modules.list
+@@ -53,4 +53,7 @@ jdk.security.jgss,
+ jdk.unsupported,
+ jdk.xml.dom,
+ jdk.zipfs,
+-jdk.hotspot.agent
+jdk.hotspot.agent,
+jcef,
+gluegen.rt,
+jogl.all
+diff --git src/java.desktop/share/classes/module-info.java src/java.desktop/share/classes/module-info.java
+index b663b382f52..3e9acdc0c27 100644
+--- src/java.desktop/share/classes/module-info.java
+++ src/java.desktop/share/classes/module-info.java
+@@ -109,7 +109,11 @@ module java.desktop {
+     // see make/GensrcModuleInfo.gmk
+     exports sun.awt to
+         jdk.accessibility,
+-        jdk.unsupported.desktop;
+        jdk.unsupported.desktop,
+        jcef,
+        jogl.all;
+
+    exports java.awt.peer to jcef;
+ 
+     exports java.awt.dnd.peer to jdk.unsupported.desktop;
+     exports sun.awt.dnd to jdk.unsupported.desktop;
--- a/jb/project/tools/patches/dcevm/0001-Apply-basic-dcevm11-patch.patch
+++ b/jb/project/tools/patches/dcevm/0001-Apply-basic-dcevm11-patch.patch
--- a/jb/project/tools/patches/dcevm/0002-dcevm11-fixes.patch
+++ b/jb/project/tools/patches/dcevm/0002-dcevm11-fixes.patch
--- a/jb/project/tools/patches/dcevm/0003-Fix-class-cast-exception-on-redefinition-of-class-A-.patch
+++ b/jb/project/tools/patches/dcevm/0003-Fix-class-cast-exception-on-redefinition-of-class-A-.patch
@@ -0,0 +1,29 @@
+From 960dafbeeba190911955c208b611fecc15d66738 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Wed, 11 Mar 2020 14:19:34 +0100
+Subject: [PATCH 03/34] Fix class cast exception on redefinition of class A,
+ that is superclass of B that has anonymous class C
+
+---
+ src/hotspot/share/oops/instanceKlass.cpp | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
+index 994fc8a3bc8..3be3a09ef8f 100644
+--- a/src/hotspot/share/oops/instanceKlass.cpp
+++ b/src/hotspot/share/oops/instanceKlass.cpp
+@@ -953,7 +953,10 @@ bool InstanceKlass::link_class_impl(TRAPS) {
+ 
+     if (!is_linked()) {
+       if (!is_rewritten()) {
+-        {
+        // (DCEVM): If class A is being redefined and class B->A (B is extended from A) and B is host class of anonymous class C
+        // then second redefinition fails with cannot cast klass exception. So we currently turn off bytecode verification
+        // on redefinition.
+        if (!AllowEnhancedClassRedefinition || !newest_version()->is_redefining()) {
+           bool verify_ok = verify_code(THREAD);
+           if (!verify_ok) {
+             return false;
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0004-HotswapAgent-integration.patch
+++ b/jb/project/tools/patches/dcevm/0004-HotswapAgent-integration.patch
--- a/jb/project/tools/patches/dcevm/0005-Support-for-Lambda-class-redefinition.patch
+++ b/jb/project/tools/patches/dcevm/0005-Support-for-Lambda-class-redefinition.patch
@@ -0,0 +1,240 @@
+From 39df5f163d4a0f1fd6b92313a5570808f19d5e20 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 4 Oct 2020 21:12:12 +0200
+Subject: [PATCH 05/34] Support for Lambda class redefinition
+
+---
+ .../share/classfile/classLoaderData.cpp       |  9 +++
+ .../share/classfile/classLoaderData.hpp       |  2 +-
+ .../share/classfile/systemDictionary.cpp      | 12 +++-
+ .../share/classfile/systemDictionary.hpp      |  1 +
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 65 +++++++++++++++++--
+ .../prims/jvmtiEnhancedRedefineClasses.hpp    |  1 +
+ .../share/prims/resolvedMethodTable.cpp       |  2 +
+ src/hotspot/share/prims/unsafe.cpp            |  1 +
+ 8 files changed, 83 insertions(+), 10 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
+index 0cd90bb8c27..4d64c6b454a 100644
+--- a/src/hotspot/share/classfile/classLoaderData.cpp
+++ b/src/hotspot/share/classfile/classLoaderData.cpp
+@@ -593,6 +593,15 @@ Dictionary* ClassLoaderData::create_dictionary() {
+   return new Dictionary(this, size, resizable);
+ }
+ 
+void ClassLoaderData::exchange_holders(ClassLoaderData* cld) {
+  oop holder_oop = _holder.peek();
+  _holder.replace(cld->_holder.peek());
+  cld->_holder.replace(holder_oop);
+  WeakHandle<vm_class_loader_data> exchange = _holder;
+  _holder = cld->_holder;
+  cld->_holder = exchange;
+}
+
+ // Tell the GC to keep this klass alive while iterating ClassLoaderDataGraph
+ oop ClassLoaderData::holder_phantom() const {
+   // A klass that was previously considered dead can be looked up in the
+diff --git a/src/hotspot/share/classfile/classLoaderData.hpp b/src/hotspot/share/classfile/classLoaderData.hpp
+index ba2393f8dd0..e2ae0a77351 100644
+--- a/src/hotspot/share/classfile/classLoaderData.hpp
+++ b/src/hotspot/share/classfile/classLoaderData.hpp
+@@ -181,7 +181,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
+   bool has_accumulated_modified_oops()   { return _accumulated_modified_oops; }
+   oop holder_no_keepalive() const;
+   oop holder_phantom() const;
+-
+  void exchange_holders(ClassLoaderData* cld);
+  private:
+   void unload();
+   bool keep_alive() const       { return _keep_alive > 0; }
+diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
+index bd0cae7cb9b..8f2b46add4d 100644
+--- a/src/hotspot/share/classfile/systemDictionary.cpp
+++ b/src/hotspot/share/classfile/systemDictionary.cpp
+@@ -1062,10 +1062,14 @@ InstanceKlass* SystemDictionary::parse_stream(Symbol* class_name,
+                                               Handle class_loader,
+                                               ClassFileStream* st,
+                                               const ClassLoadInfo& cl_info,
+                                              InstanceKlass* old_klass,
+                                               TRAPS) {
+ 
+   EventClassLoad class_load_start_event;
+   ClassLoaderData* loader_data;
+  
+  bool is_redefining = (old_klass != NULL);
+  
+   bool is_unsafe_anon_class = cl_info.unsafe_anonymous_host() != NULL;
+ 
+   // - for unsafe anonymous class: create a new CLD whith a class holder that uses
+@@ -1094,8 +1098,12 @@ InstanceKlass* SystemDictionary::parse_stream(Symbol* class_name,
+                                                       class_name,
+                                                       loader_data,
+                                                       cl_info,
+-                                                      false, // pick_newest
+                                                      is_redefining, // pick_newest
+                                                       CHECK_NULL);
+  if (is_redefining && k != NULL) {
+    k->set_redefining(true);
+    k->set_old_version(old_klass);
+  }
+ 
+   if ((cl_info.is_hidden() || is_unsafe_anon_class) && k != NULL) {
+     // Hidden classes that are not strong and unsafe anonymous classes must update
+@@ -1998,7 +2006,7 @@ void SystemDictionary::remove_from_hierarchy(InstanceKlass* k) {
+   k->remove_from_sibling_list();
+ }
+ 
+-// (DCEVM) 
+// (DCEVM)
+ void SystemDictionary::update_constraints_after_redefinition() {
+   constraints()->update_after_redefinition();
+ }
+diff --git a/src/hotspot/share/classfile/systemDictionary.hpp b/src/hotspot/share/classfile/systemDictionary.hpp
+index 4547449dbec..931e655d631 100644
+--- a/src/hotspot/share/classfile/systemDictionary.hpp
+++ b/src/hotspot/share/classfile/systemDictionary.hpp
+@@ -329,6 +329,7 @@ public:
+                                      Handle class_loader,
+                                      ClassFileStream* st,
+                                      const ClassLoadInfo& cl_info,
+                                     InstanceKlass* old_klass,
+                                      TRAPS);
+ 
+   // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 92ce6c27b8a..8b765623dcd 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -494,6 +494,8 @@ void VM_EnhancedRedefineClasses::doit() {
+     ClassLoaderDataGraph::classes_do(&clear_cpool_cache);
+ 
+ 
+    // SystemDictionary::methods_do(fix_invoke_method);
+
+   // JSR-292 support
+   if (_any_class_has_resolved_methods) {
+     bool trace_name_printed = false;
+@@ -756,12 +758,34 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
+     // load hook event.
+     state->set_class_being_redefined(the_class, _class_load_kind);
+ 
+-    InstanceKlass* k = SystemDictionary::resolve_from_stream(the_class_sym,
+-                                                the_class_loader,
+-                                                protection_domain,
+-                                                &st,
+-                                                the_class,
+-                                                THREAD);
+    InstanceKlass* k;
+
+    if (InstanceKlass::cast(the_class)->is_anonymous()) {
+      const InstanceKlass* host_class = the_class->host_klass();
+
+      // Make sure it's the real host class, not another anonymous class.
+      while (host_class != NULL && host_class->is_anonymous()) {
+        host_class = host_class->host_klass();
+      }
+
+      k = SystemDictionary::parse_stream(the_class_sym,
+                                         the_class_loader,
+                                         protection_domain,
+                                         &st,
+                                         host_class,
+                                         the_class,
+                                         NULL,
+                                         THREAD);
+      k->class_loader_data()->exchange_holders(the_class->class_loader_data());
+      the_class->class_loader_data()->inc_keep_alive();
+    } else {
+      k = SystemDictionary::resolve_from_stream(the_class_sym,
+                                                  the_class_loader,
+                                                  protection_domain,
+                                                  &st,
+                                                  the_class,
+                                                  THREAD);
+    }
+     // Clear class_being_redefined just to be sure.
+     state->clear_class_being_redefined();
+ 
+@@ -1442,6 +1466,30 @@ void VM_EnhancedRedefineClasses::MethodDataCleaner::do_klass(Klass* k) {
+   }
+ }
+ 
+void VM_EnhancedRedefineClasses::fix_invoke_method(Method* method) {
+
+  constantPoolHandle other_cp = constantPoolHandle(method->constants());
+
+  for (int i = 0; i < other_cp->length(); i++) {
+    if (other_cp->tag_at(i).is_klass()) {
+      Klass* klass = other_cp->resolved_klass_at(i);
+      if (klass->new_version() != NULL) {
+        // Constant pool entry points to redefined class -- update to the new version
+        other_cp->klass_at_put(i, klass->newest_version());
+      }
+      assert(other_cp->resolved_klass_at(i)->new_version() == NULL, "Must be new klass!");
+    }
+  }
+
+  ConstantPoolCache* cp_cache = other_cp->cache();
+  if (cp_cache != NULL) {
+    cp_cache->clear_entries();
+  }
+
+}
+
+
+
+ void VM_EnhancedRedefineClasses::update_jmethod_ids() {
+   for (int j = 0; j < _matching_methods_length; ++j) {
+     Method* old_method = _matching_old_methods[j];
+@@ -1979,7 +2027,10 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
+   // Find classes not directly redefined, but affected by a redefinition (because one of its supertypes is redefined)
+   AffectedKlassClosure closure(_affected_klasses);
+   // Updated in j10, from original SystemDictionary::classes_do
+-  ClassLoaderDataGraph::dictionary_classes_do(&closure);
+
+  ClassLoaderDataGraph::classes_do(&closure);
+  //ClassLoaderDataGraph::dictionary_classes_do(&closure);
+
+   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
+ 
+   // Sort the affected klasses such that a supertype is always on a smaller array index than its subtype.
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index 60b62c3170a..d8a11b51fe9 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -116,6 +116,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   void rollback();
+   static void mark_as_scavengable(nmethod* nm);
+   static void unpatch_bytecode(Method* method);
+  static void fix_invoke_method(Method* method);
+ 
+   // Figure out which new methods match old methods in name and signature,
+   // which methods have been added, and which are no longer present
+diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
+index 122bb8c186b..81b3aa96564 100644
+--- a/src/hotspot/share/prims/resolvedMethodTable.cpp
+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
+@@ -414,6 +414,8 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+         InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
+         Method* newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
+ 
+        log_info(redefine, class, load, exceptions)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+
+         assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
+         assert(newer_method != NULL, "method_with_idnum() should not be NULL");
+         assert(old_method != newer_method, "sanity check");
+diff --git a/src/hotspot/share/prims/unsafe.cpp b/src/hotspot/share/prims/unsafe.cpp
+index 72d81ec9d6c..027afa3fabd 100644
+--- a/src/hotspot/share/prims/unsafe.cpp
+++ b/src/hotspot/share/prims/unsafe.cpp
+@@ -865,6 +865,7 @@ Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
+                                                 host_loader,
+                                                 &st,
+                                                 cl_info,
+                                                NULL,
+                                                 CHECK_NULL);
+   if (anonk == NULL) {
+     return NULL;
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0006-Fix-no-original-bytecode-found-error-if-method-with-.patch
+++ b/jb/project/tools/patches/dcevm/0006-Fix-no-original-bytecode-found-error-if-method-with-.patch
@@ -0,0 +1,135 @@
+From 5af1daedc86b5fec0f222cbdda3afbdf518985ea Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sat, 23 May 2020 10:02:15 +0200
+Subject: [PATCH 06/34] Fix "no original bytecode found" error if method with
+ bkp is missing
+
+Sometimes IDE can deploy class with erroneous method, such method has
+n bytecode, but breakpoint position can still exist.
+---
+ src/hotspot/share/interpreter/bytecodes.cpp    |  2 +-
+ .../share/interpreter/interpreterRuntime.cpp   |  2 +-
+ src/hotspot/share/oops/method.cpp              |  8 ++++----
+ src/hotspot/share/oops/method.hpp              |  4 ++--
+ .../prims/jvmtiEnhancedRedefineClasses.cpp     | 18 ++++++++++--------
+ 5 files changed, 18 insertions(+), 16 deletions(-)
+
+diff --git a/src/hotspot/share/interpreter/bytecodes.cpp b/src/hotspot/share/interpreter/bytecodes.cpp
+index e377e36b88c..262ecc021b2 100644
+--- a/src/hotspot/share/interpreter/bytecodes.cpp
+++ b/src/hotspot/share/interpreter/bytecodes.cpp
+@@ -84,7 +84,7 @@ Bytecodes::Code Bytecodes::code_at(Method* method, int bci) {
+ Bytecodes::Code Bytecodes::non_breakpoint_code_at(const Method* method, address bcp) {
+   assert(method != NULL, "must have the method for breakpoint conversion");
+   assert(method->contains(bcp), "must be valid bcp in method");
+-  return method->orig_bytecode_at(method->bci_from(bcp));
+  return method->orig_bytecode_at(method->bci_from(bcp), false);
+ }
+ 
+ int Bytecodes::special_length_at(Bytecodes::Code code, address bcp, address end) {
+diff --git a/src/hotspot/share/interpreter/interpreterRuntime.cpp b/src/hotspot/share/interpreter/interpreterRuntime.cpp
+index ed3cc3eb6a2..504e59caf51 100644
+--- a/src/hotspot/share/interpreter/interpreterRuntime.cpp
+++ b/src/hotspot/share/interpreter/interpreterRuntime.cpp
+@@ -814,7 +814,7 @@ JRT_END
+ // Invokes
+ 
+ JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
+-  return method->orig_bytecode_at(method->bci_from(bcp));
+  return method->orig_bytecode_at(method->bci_from(bcp), false);
+ JRT_END
+ 
+ JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* thread, Method* method, address bcp, Bytecodes::Code new_code))
+diff --git a/src/hotspot/share/oops/method.cpp b/src/hotspot/share/oops/method.cpp
+index 516f2bb8f2f..1c88511a5fc 100644
+--- a/src/hotspot/share/oops/method.cpp
+++ b/src/hotspot/share/oops/method.cpp
+@@ -1853,14 +1853,14 @@ bool CompressedLineNumberReadStream::read_pair() {
+ 
+ #if INCLUDE_JVMTI
+ 
+-Bytecodes::Code Method::orig_bytecode_at(int bci) const {
+Bytecodes::Code Method::orig_bytecode_at(int bci, bool no_fatal) const {
+   BreakpointInfo* bp = method_holder()->breakpoints();
+   for (; bp != NULL; bp = bp->next()) {
+     if (bp->match(this, bci)) {
+       return bp->orig_bytecode();
+     }
+   }
+-  {
+  if (!no_fatal) {
+     ResourceMark rm;
+     fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
+   }
+@@ -2006,7 +2006,7 @@ BreakpointInfo::BreakpointInfo(Method* m, int bci) {
+   _signature_index = m->signature_index();
+   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
+   if (_orig_bytecode == Bytecodes::_breakpoint)
+-    _orig_bytecode = m->orig_bytecode_at(_bci);
+    _orig_bytecode = m->orig_bytecode_at(_bci, false);
+   _next = NULL;
+ }
+ 
+@@ -2015,7 +2015,7 @@ void BreakpointInfo::set(Method* method) {
+   {
+     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
+     if (code == Bytecodes::_breakpoint)
+-      code = method->orig_bytecode_at(_bci);
+      code = method->orig_bytecode_at(_bci, false);
+     assert(orig_bytecode() == code, "original bytecode must be the same");
+   }
+ #endif
+diff --git a/src/hotspot/share/oops/method.hpp b/src/hotspot/share/oops/method.hpp
+index 83ed2d9c3c1..4d4cc6dc012 100644
+--- a/src/hotspot/share/oops/method.hpp
+++ b/src/hotspot/share/oops/method.hpp
+@@ -230,7 +230,7 @@ class Method : public Metadata {
+ 
+   // JVMTI breakpoints
+ #if !INCLUDE_JVMTI
+-  Bytecodes::Code orig_bytecode_at(int bci) const {
+  Bytecodes::Code orig_bytecode_at(int bci, bool no_fatal) const {
+     ShouldNotReachHere();
+     return Bytecodes::_shouldnotreachhere;
+   }
+@@ -239,7 +239,7 @@ class Method : public Metadata {
+   };
+   u2   number_of_breakpoints() const {return 0;}
+ #else // !INCLUDE_JVMTI
+-  Bytecodes::Code orig_bytecode_at(int bci) const;
+  Bytecodes::Code orig_bytecode_at(int bci, bool no_fatal) const;
+   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
+   void set_breakpoint(int bci);
+   void clear_breakpoint(int bci);
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 8b765623dcd..a859b8e1162 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -1362,14 +1362,16 @@ void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method) {
+ 
+     if (code == Bytecodes::_breakpoint) {
+       int bci = method->bci_from(bcp);
+-      code = method->orig_bytecode_at(bci);
+-      java_code = Bytecodes::java_code(code);
+-      if (code != java_code &&
+-           (java_code == Bytecodes::_getfield ||
+-            java_code == Bytecodes::_putfield ||
+-            java_code == Bytecodes::_aload_0)) {
+-        // Let breakpoint table handling unpatch bytecode
+-        method->set_orig_bytecode_at(bci, java_code);
+      code = method->orig_bytecode_at(bci, true);
+      if (code != Bytecodes::_shouldnotreachhere) {
+        java_code = Bytecodes::java_code(code);
+        if (code != java_code &&
+             (java_code == Bytecodes::_getfield ||
+              java_code == Bytecodes::_putfield ||
+              java_code == Bytecodes::_aload_0)) {
+          // Let breakpoint table handling unpatch bytecode
+          method->set_orig_bytecode_at(bci, java_code);
+        }
+       }
+     } else {
+       java_code = Bytecodes::java_code(code);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0007-Replace-deleted-method-with-Universe-throw_no_such_m.patch
+++ b/jb/project/tools/patches/dcevm/0007-Replace-deleted-method-with-Universe-throw_no_such_m.patch
@@ -0,0 +1,57 @@
+From 19d2274a5dff6e6b31474252b45e5e7484f0180b Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 24 May 2020 12:07:42 +0200
+Subject: [PATCH 07/34] Replace deleted method with
+ Universe::throw_no_such_method_error
+
+---
+ .../share/prims/resolvedMethodTable.cpp       | 28 +++++++++----------
+ 1 file changed, 14 insertions(+), 14 deletions(-)
+
+diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
+index 81b3aa96564..caf03ffe56d 100644
+--- a/src/hotspot/share/prims/resolvedMethodTable.cpp
+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
+@@ -404,25 +404,25 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+ 
+       if (old_method->is_old()) {
+ 
+        InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
+        Method* newer_method;
+
+         // Method* new_method;
+         if (old_method->is_deleted()) {
+-          // FIXME:(DCEVM) - check if exception can be thrown
+-          // new_method = Universe::throw_no_such_method_error();
+-          continue;
+-        }
+-
+-        InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
+-        Method* newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
+          newer_method = Universe::throw_no_such_method_error();
+        } else {
+          newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
+ 
+-        log_info(redefine, class, load, exceptions)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+          log_info(redefine, class, load, exceptions)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+ 
+-        assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
+-        assert(newer_method != NULL, "method_with_idnum() should not be NULL");
+-        assert(old_method != newer_method, "sanity check");
+          assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
+          assert(newer_method != NULL, "method_with_idnum() should not be NULL");
+          assert(old_method != newer_method, "sanity check");
+ 
+-        if (_the_table->lookup(newer_method) != NULL) {
+-          // old method was already adjusted if new method exists in _the_table
+-            continue;
+          if (_the_table->lookup(newer_method) != NULL) {
+            // old method was already adjusted if new method exists in _the_table
+              continue;
+          }
+         }
+ 
+         java_lang_invoke_ResolvedMethodName::set_vmtarget(mem_name, newer_method);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0008-Support-for-G1-gc.patch
+++ b/jb/project/tools/patches/dcevm/0008-Support-for-G1-gc.patch
--- a/jb/project/tools/patches/dcevm/0009-Change-log-level-in-advanced-redefinition.patch
+++ b/jb/project/tools/patches/dcevm/0009-Change-log-level-in-advanced-redefinition.patch
@@ -0,0 +1,50 @@
+From ca47ab5a0a6ce8e2644736f323a335a957311af9 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sat, 13 Jun 2020 18:50:59 +0200
+Subject: [PATCH 09/34] Change log level in advanced redefinition
+
+- Change log level for "Comparing different class ver.." to debug
+- Fix adjust_method_entries_dcevm logging levels and severity
+---
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 2 +-
+ src/hotspot/share/prims/resolvedMethodTable.cpp          | 4 ++--
+ 2 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 6c9eb40ecf5..b09ba554e07 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -916,7 +916,7 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
+  // Calculated the difference between new and old class  (field change, method change, supertype change, ...).
+ int VM_EnhancedRedefineClasses::calculate_redefinition_flags(InstanceKlass* new_class) {
+   int result = Klass::NoRedefinition;
+-  log_info(redefine, class, load)("Comparing different class versions of class %s",new_class->name()->as_C_string());
+  log_debug(redefine, class, load)("Comparing different class versions of class %s",new_class->name()->as_C_string());
+ 
+   assert(new_class->old_version() != NULL, "must have old version");
+   InstanceKlass* the_class = InstanceKlass::cast(new_class->old_version());
+diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
+index caf03ffe56d..eb9fcda44f3 100644
+--- a/src/hotspot/share/prims/resolvedMethodTable.cpp
+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
+@@ -413,7 +413,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+         } else {
+           newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
+ 
+-          log_info(redefine, class, load, exceptions)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+          log_debug(redefine, class, update)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+ 
+           assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
+           assert(newer_method != NULL, "method_with_idnum() should not be NULL");
+@@ -433,7 +433,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+ 
+         ResourceMark rm;
+         if (!(*trace_name_printed)) {
+-          log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
+          log_debug(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
+            *trace_name_printed = true;
+         }
+         log_debug(redefine, class, update, constantpool)
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0010-AllowEnhancedClassRedefinition-is-false-disabled-by-.patch
+++ b/jb/project/tools/patches/dcevm/0010-AllowEnhancedClassRedefinition-is-false-disabled-by-.patch
@@ -0,0 +1,26 @@
+From 7e236beee0375656d1955fc1168143c1639fb7f1 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Tue, 6 Oct 2020 22:15:31 +0200
+Subject: [PATCH 10/34] AllowEnhancedClassRedefinition is false (disabled) by
+ default
+
+---
+ src/hotspot/share/runtime/globals.hpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
+index 5b367704800..2710c6ea0e5 100644
+--- a/src/hotspot/share/runtime/globals.hpp
+++ b/src/hotspot/share/runtime/globals.hpp
+@@ -2466,7 +2466,7 @@ const size_t minimumSymbolTableSize = 1024;
+   diagnostic(bool, DeoptimizeNMethodBarriersALot, false,                    \
+                 "Make nmethod barriers deoptimise a lot.")                  \
+                                                                             \
+-  product(bool, AllowEnhancedClassRedefinition, true,                       \
+  product(bool, AllowEnhancedClassRedefinition, false,                      \
+              "Allow enhanced class redefinition beyond swapping method "    \
+              "bodies")                                                      \
+                                                                             \
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0011-add-jvmtiEnhancedRedefineClasses.-to-CMakeLists.txt.patch
+++ b/jb/project/tools/patches/dcevm/0011-add-jvmtiEnhancedRedefineClasses.-to-CMakeLists.txt.patch
--- a/jb/project/tools/patches/dcevm/0012-Set-HOTSPOT_VM_DISTRO-Dynamic-Code-Evolution.patch
+++ b/jb/project/tools/patches/dcevm/0012-Set-HOTSPOT_VM_DISTRO-Dynamic-Code-Evolution.patch
@@ -0,0 +1,25 @@
+From d56e73885111b386771f564ec6beb305338993df Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 19 Oct 2020 20:00:04 +0200
+Subject: [PATCH 12/34] Set HOTSPOT_VM_DISTRO=Dynamic Code Evolution
+
+---
+ make/autoconf/version-numbers | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/make/autoconf/version-numbers b/make/autoconf/version-numbers
+index aabdc5bed20..df8025a2e84 100644
+--- a/make/autoconf/version-numbers
+++ b/make/autoconf/version-numbers
+@@ -45,7 +45,7 @@ PRODUCT_NAME=OpenJDK
+ PRODUCT_SUFFIX="Runtime Environment"
+ JDK_RC_PLATFORM_NAME=Platform
+ COMPANY_NAME=N/A
+-HOTSPOT_VM_DISTRO="OpenJDK"
+HOTSPOT_VM_DISTRO="Dynamic Code Evolution"
+ VENDOR_URL=https://openjdk.java.net/
+ VENDOR_URL_BUG=https://bugreport.java.com/bugreport/
+ VENDOR_URL_VM_BUG=https://bugreport.java.com/bugreport/crash.jsp
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0013-Fix-G1-nmethod-registration.patch
+++ b/jb/project/tools/patches/dcevm/0013-Fix-G1-nmethod-registration.patch
@@ -0,0 +1,71 @@
+From 7ebad43ed45805b0a3736c510f708ff17697ba7e Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 11 Oct 2020 10:43:28 +0200
+Subject: [PATCH 13/34] Fix G1 nmethod registration
+
+---
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 19 ++++++++++++++++---
+ .../prims/jvmtiEnhancedRedefineClasses.hpp    |  3 ++-
+ 2 files changed, 18 insertions(+), 4 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index b09ba554e07..718426f2819 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -216,7 +216,14 @@ void VM_EnhancedRedefineClasses::mark_as_scavengable(nmethod* nm) {
+   }
+ }
+ 
+-void VM_EnhancedRedefineClasses::mark_as_scavengable_g1(nmethod* nm) {
+void VM_EnhancedRedefineClasses::unregister_nmethod_g1(nmethod* nm) {
+  // It should work not only for G1 but also for another GCs, but this way is safer now
+  if (!nm->is_zombie() && !nm->is_unloaded()) {
+    Universe::heap()->unregister_nmethod(nm);
+  }
+}
+
+void VM_EnhancedRedefineClasses::register_nmethod_g1(nmethod* nm) {
+   // It should work not only for G1 but also for another GCs, but this way is safer now
+   if (!nm->is_zombie() && !nm->is_unloaded()) {
+     Universe::heap()->register_nmethod(nm);
+@@ -521,8 +528,9 @@ void VM_EnhancedRedefineClasses::doit() {
+     // For now, mark all nmethod's as scavengable that are not scavengable already
+     if (ScavengeRootsInCode) {
+       if (UseG1GC) {
+-        // this should work also for other GCs
+-        CodeCache::nmethods_do(mark_as_scavengable_g1);
+        // G1 holds references to nmethods in regions based on oops values. Since oops in nmethod can be changed in ChangePointers* closures
+        // we unregister nmethods from G1 heap, then closures are processed (oops are changed) and finally we register nmethod to G1 again
+        CodeCache::nmethods_do(unregister_nmethod_g1);
+       } else {
+         CodeCache::nmethods_do(mark_as_scavengable);
+       }
+@@ -545,6 +553,11 @@ void VM_EnhancedRedefineClasses::doit() {
+ 
+     Universe::root_oops_do(&oopClosureNoBarrier);
+ 
+    if (UseG1GC) {
+      // this should work also for other GCs
+      CodeCache::nmethods_do(register_nmethod_g1);
+    }
+
+   }
+   log_trace(redefine, class, obsolete, metadata)("After updating instances");
+ 
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index 9755944d70b..4c0412d343d 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -116,7 +116,8 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+ 
+   void rollback();
+   static void mark_as_scavengable(nmethod* nm);
+-  static void mark_as_scavengable_g1(nmethod* nm);
+  static void unregister_nmethod_g1(nmethod* nm);
+  static void register_nmethod_g1(nmethod* nm);
+   static void unpatch_bytecode(Method* method);
+   static void fix_invoke_method(Method* method);
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0014-Initialize-method-s-_new_version-_old_version-to-NUL.patch
+++ b/jb/project/tools/patches/dcevm/0014-Initialize-method-s-_new_version-_old_version-to-NUL.patch
@@ -0,0 +1,26 @@
+From 5c7e5f245f79d7e8575461dab0c356ed74c8e9a3 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Thu, 22 Oct 2020 20:15:20 +0200
+Subject: [PATCH 14/34] Initialize method's _new_version/_old_version to NULL
+
+---
+ src/hotspot/share/oops/method.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/oops/method.cpp b/src/hotspot/share/oops/method.cpp
+index 1c88511a5fc..ce940cf10a9 100644
+--- a/src/hotspot/share/oops/method.cpp
+++ b/src/hotspot/share/oops/method.cpp
+@@ -91,7 +91,8 @@ Method* Method::allocate(ClassLoaderData* loader_data,
+   return new (loader_data, size, MetaspaceObj::MethodType, THREAD) Method(cm, access_flags);
+ }
+ 
+-Method::Method(ConstMethod* xconst, AccessFlags access_flags) {
+Method::Method(ConstMethod* xconst, AccessFlags access_flags) :  _new_version(NULL),
+                                                                 _old_version(NULL) {
+   NoSafepointVerifier no_safepoint;
+   set_constMethod(xconst);
+   set_access_flags(access_flags);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0015-Clear-dcevm-code-separation.patch
+++ b/jb/project/tools/patches/dcevm/0015-Clear-dcevm-code-separation.patch
@@ -0,0 +1,193 @@
+From 6ffac6e5064ec6633fdbeb8520333dca00bc6a62 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 23 Oct 2020 10:20:26 +0200
+Subject: [PATCH 15/34] Clear dcevm code separation
+
+---
+ src/hotspot/share/classfile/systemDictionary.cpp |  4 ++--
+ src/hotspot/share/gc/serial/genMarkSweep.cpp     |  8 +++++---
+ src/hotspot/share/interpreter/linkResolver.cpp   | 16 +++++++++++-----
+ .../instrumentation/jfrEventClassTransformer.cpp |  2 +-
+ src/hotspot/share/oops/instanceKlass.cpp         | 10 ++++++----
+ src/hotspot/share/oops/method.cpp                |  2 +-
+ .../share/prims/jvmtiGetLoadedClasses.cpp        |  2 +-
+ src/hotspot/share/runtime/reflection.cpp         |  2 +-
+ 8 files changed, 28 insertions(+), 18 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
+index 8f2b46add4d..9ac6ec96cb5 100644
+--- a/src/hotspot/share/classfile/systemDictionary.cpp
+++ b/src/hotspot/share/classfile/systemDictionary.cpp
+@@ -1241,7 +1241,7 @@ InstanceKlass* SystemDictionary::resolve_from_stream(Symbol* class_name,
+     MutexLocker mu(THREAD, SystemDictionary_lock);
+ 
+     Klass* check = find_class(h_name, k->class_loader_data());
+-    assert((check == k && !k->is_redefining()) || (k->is_redefining() && check == k->old_version()), "should be present in the dictionary");
+    assert(check == k && !k->is_redefining() || k->is_redefining() && check == k->old_version(), "should be present in the dictionary");
+   } );
+ 
+   return k;
+@@ -2290,7 +2290,7 @@ void SystemDictionary::check_constraints(unsigned int d_hash,
+       // also hold array classes.
+ 
+       assert(check->is_instance_klass(), "noninstance in systemdictionary");
+-      if ((defining == true) || ((k != check) && k->old_version() != check)) {
+      if ((defining == true) || (k != check && (!AllowEnhancedClassRedefinition || k->old_version() != check))) {
+         throwException = true;
+         ss.print("loader %s", loader_data->loader_name_and_id());
+         ss.print(" attempted duplicate %s definition for %s. (%s)",
+diff --git a/src/hotspot/share/gc/serial/genMarkSweep.cpp b/src/hotspot/share/gc/serial/genMarkSweep.cpp
+index 1d13c647452..548df01e557 100644
+--- a/src/hotspot/share/gc/serial/genMarkSweep.cpp
+++ b/src/hotspot/share/gc/serial/genMarkSweep.cpp
+@@ -334,7 +334,9 @@ void GenMarkSweep::mark_sweep_phase4() {
+ 
+   GenCompactClosure blk;
+   gch->generation_iterate(&blk, true);
+-  DcevmSharedGC::copy_rescued_objects_back(MarkSweep::_rescued_oops, true);
+-  DcevmSharedGC::clear_rescued_objects_resource(MarkSweep::_rescued_oops);
+-  MarkSweep::_rescued_oops = NULL;
+  if (AllowEnhancedClassRedefinition) {
+    DcevmSharedGC::copy_rescued_objects_back(MarkSweep::_rescued_oops, true);
+    DcevmSharedGC::clear_rescued_objects_resource(MarkSweep::_rescued_oops);
+    MarkSweep::_rescued_oops = NULL;
+  }
+ }
+diff --git a/src/hotspot/share/interpreter/linkResolver.cpp b/src/hotspot/share/interpreter/linkResolver.cpp
+index b6e9e0a308d..b2f24ddbeda 100644
+--- a/src/hotspot/share/interpreter/linkResolver.cpp
+++ b/src/hotspot/share/interpreter/linkResolver.cpp
+@@ -282,9 +282,14 @@ void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass,
+   if (!base_klass->is_instance_klass()) {
+     return;  // no relevant check to do
+   }
+-
+-  Reflection::VerifyClassAccessResults vca_result =
+-    Reflection::verify_class_access(ref_klass->newest_version(), InstanceKlass::cast(base_klass->newest_version()), true);
+  Klass* refKlassNewest = ref_klass;
+  Klass* baseKlassNewest = base_klass;
+  if (AllowEnhancedClassRedefinition) {
+    refKlassNewest = ref_klass->newest_version();
+    baseKlassNewest = base_klass->newest_version();
+  }
+  Reflection::VerifyClassAccessResults vca_result = 
+    Reflection::verify_class_access(refKlassNewest, InstanceKlass::cast(baseKlassNewest), true);
+   if (vca_result != Reflection::ACCESS_OK) {
+     ResourceMark rm(THREAD);
+     char* msg = Reflection::verify_class_access_msg(ref_klass,
+@@ -566,7 +571,8 @@ void LinkResolver::check_method_accessability(Klass* ref_klass,
+   // We'll check for the method name first, as that's most likely
+   // to be false (so we'll short-circuit out of these tests).
+   if (sel_method->name() == vmSymbols::clone_name() &&
+-      sel_klass->newest_version() == SystemDictionary::Object_klass()->newest_version() &&
+      ( !AllowEnhancedClassRedefinition && sel_klass == SystemDictionary::Object_klass() ||
+      AllowEnhancedClassRedefinition && sel_klass->newest_version() == SystemDictionary::Object_klass()->newest_version()) &&
+       resolved_klass->is_array_klass()) {
+     // We need to change "protected" to "public".
+     assert(flags.is_protected(), "clone not protected?");
+@@ -1011,7 +1017,7 @@ void LinkResolver::resolve_field(fieldDescriptor& fd,
+     //     or by the <init> method (in case of an instance field).
+     if (is_put && fd.access_flags().is_final()) {
+ 
+-      if (sel_klass != current_klass && sel_klass != current_klass->active_version()) {
+      if (sel_klass != current_klass && (!AllowEnhancedClassRedefinition || sel_klass != current_klass->active_version())) {
+         ResourceMark rm(THREAD);
+         stringStream ss;
+         ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
+diff --git a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
+index 96fc139bea3..f7284197c5a 100644
+--- a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
+++ b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
+@@ -1471,7 +1471,7 @@ static InstanceKlass* create_new_instance_klass(InstanceKlass* ik, ClassFileStre
+                              cld,
+                              &cl_info,
+                              ClassFileParser::INTERNAL, // internal visibility
+-							 false,
+                             false,
+                              THREAD);
+   if (HAS_PENDING_EXCEPTION) {
+     log_pending_exception(PENDING_EXCEPTION);
+diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
+index 3be3a09ef8f..f8e60941046 100644
+--- a/src/hotspot/share/oops/instanceKlass.cpp
+++ b/src/hotspot/share/oops/instanceKlass.cpp
+@@ -199,7 +199,9 @@ bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
+         // able to perform that loading but we can't exclude the compiler threads from
+         // executing this logic. But it should actually be impossible to trigger loading here.
+         Klass* k2 = _constants->klass_at(cp_index, THREAD);
+-        k2 = k2->newest_version();
+        if (AllowEnhancedClassRedefinition) {
+          k2 = k2->newest_version();
+        }
+         assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
+                "Exceptions should not be possible here");
+         if (k2 == k) {
+@@ -1003,7 +1005,7 @@ bool InstanceKlass::link_class_impl(TRAPS) {
+ #endif
+       set_init_state(linked);
+       // (DCEVM) Must check for old version in order to prevent infinite loops.
+-      if (JvmtiExport::should_post_class_prepare() && old_version() == NULL /* JVMTI deadlock otherwise */) {
+      if (JvmtiExport::should_post_class_prepare() && (!AllowEnhancedClassRedefinition || old_version() == NULL) /* JVMTI deadlock otherwise */) {
+         Thread *thread = THREAD;
+         assert(thread->is_Java_thread(), "thread->is_Java_thread()");
+         JvmtiExport::post_class_prepare((JavaThread *) thread, this);
+@@ -1084,7 +1086,7 @@ void InstanceKlass::initialize_impl(TRAPS) {
+     // we might end up throwing IE from link/symbol resolution sites
+     // that aren't expected to throw.  This would wreak havoc.  See 6320309.
+     while ((is_being_initialized() && !is_reentrant_initialization(jt)) 
+-            || (old_version() != NULL && InstanceKlass::cast(old_version())->is_being_initialized())) {
+            || (AllowEnhancedClassRedefinition && old_version() != NULL && InstanceKlass::cast(old_version())->is_being_initialized())) {
+       wait = true;
+       jt->set_class_to_be_initialized(this);
+       ol.wait_uninterruptibly(jt);
+@@ -3782,7 +3784,7 @@ void InstanceKlass::verify_on(outputStream* st) {
+ 
+     guarantee(sib->is_klass(), "should be klass");
+     // TODO: (DCEVM) explain
+-    guarantee(sib->super() == super || super->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
+    guarantee(sib->super() == super || AllowEnhancedClassRedefinition && super->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
+   }
+ 
+   // Verify local interfaces
+diff --git a/src/hotspot/share/oops/method.cpp b/src/hotspot/share/oops/method.cpp
+index ce940cf10a9..2d8e5b0256b 100644
+--- a/src/hotspot/share/oops/method.cpp
+++ b/src/hotspot/share/oops/method.cpp
+@@ -2208,7 +2208,7 @@ void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
+ // Add a method id to the jmethod_ids
+ jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
+   // FIXME: (DCEVM) ???
+-  if (m != m->newest_version()) {
+  if (AllowEnhancedClassRedefinition && m != m->newest_version()) {
+     m = m->newest_version();
+   }
+   ClassLoaderData* cld = loader_data;
+diff --git a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+index 1c7677f270f..6c12ee64a6e 100644
+--- a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+@@ -75,7 +75,7 @@ public:
+     //         the new version (SystemDictionary stores only new versions). But the LoadedClassesClosure's functionality was
+     //         changed in java8  where jvmtiLoadedClasses collects all classes from all classloaders, therefore we
+     //         must use new versions only.
+-    if (k->new_version()==NULL) {
+    if (AllowEnhancedClassRedefinition && k->new_version()==NULL) {
+       _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, k->java_mirror())));
+       if (_dictionary_walk) {
+         // Collect array classes this way when walking the dictionary (because array classes are
+diff --git a/src/hotspot/share/runtime/reflection.cpp b/src/hotspot/share/runtime/reflection.cpp
+index 0e7722dba7d..d67457f02ac 100644
+--- a/src/hotspot/share/runtime/reflection.cpp
+++ b/src/hotspot/share/runtime/reflection.cpp
+@@ -628,7 +628,7 @@ bool Reflection::verify_member_access(const Klass* current_class,
+                                       TRAPS) {
+ 
+   // (DCEVM) Decide accessibility based on active version
+-  if (current_class != NULL) {
+  if (AllowEnhancedClassRedefinition && current_class != NULL) {
+     current_class = current_class->active_version();
+   }
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0016-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch
+++ b/jb/project/tools/patches/dcevm/0016-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch
@@ -0,0 +1,26 @@
+From dc675de6ac42819b8536827ea450fcad13a97448 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Wed, 11 Nov 2020 18:45:15 +0100
+Subject: [PATCH 16/34] Fix LoadedClassesClosure - fixes problems with remote
+ debugging
+
+---
+ src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+index 6c12ee64a6e..2a469555dbd 100644
+--- a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+@@ -75,7 +75,7 @@ public:
+     //         the new version (SystemDictionary stores only new versions). But the LoadedClassesClosure's functionality was
+     //         changed in java8  where jvmtiLoadedClasses collects all classes from all classloaders, therefore we
+     //         must use new versions only.
+-    if (AllowEnhancedClassRedefinition && k->new_version()==NULL) {
+    if (!AllowEnhancedClassRedefinition || k->new_version()==NULL) {
+       _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, k->java_mirror())));
+       if (_dictionary_walk) {
+         // Collect array classes this way when walking the dictionary (because array classes are
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0017-pre-dcevm15-Cleanup-code-related-to-removed-CMS.patch
+++ b/jb/project/tools/patches/dcevm/0017-pre-dcevm15-Cleanup-code-related-to-removed-CMS.patch
--- a/jb/project/tools/patches/dcevm/0018-pre-dcevm15-fix-GC-spaces-originally-in-removed-CMS-.patch
+++ b/jb/project/tools/patches/dcevm/0018-pre-dcevm15-fix-GC-spaces-originally-in-removed-CMS-.patch
@@ -0,0 +1,183 @@
+From 1d682efa88c716e1849163d5abff3a3367581d16 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 16 Nov 2020 21:11:19 +0100
+Subject: [PATCH 18/34] pre dcevm15 - fix GC spaces originally in removed CMS
+ patch
+
+---
+ src/hotspot/share/gc/shared/space.cpp            | 16 ++++++++--------
+ src/hotspot/share/gc/shared/space.hpp            |  6 +++---
+ src/hotspot/share/gc/shared/space.inline.hpp     | 14 ++++++++------
+ .../share/prims/jvmtiEnhancedRedefineClasses.cpp |  6 ++----
+ 4 files changed, 21 insertions(+), 21 deletions(-)
+
+diff --git a/src/hotspot/share/gc/shared/space.cpp b/src/hotspot/share/gc/shared/space.cpp
+index 875a6dc854f..9772c32c42e 100644
+--- a/src/hotspot/share/gc/shared/space.cpp
+++ b/src/hotspot/share/gc/shared/space.cpp
+@@ -375,11 +375,11 @@ HeapWord* CompactibleSpace::forward_compact_top(size_t size, CompactPoint* cp, H
+ }
+ 
+ HeapWord* CompactibleSpace::forward(oop q, size_t size,
+-                                    CompactPoint* cp, HeapWord* compact_top) {
+                                    CompactPoint* cp, HeapWord* compact_top, bool force_forward) {
+   compact_top = forward_compact_top(size, cp, compact_top);
+ 
+   // store the forwarding pointer into the mark word
+-  if (cast_from_oop<HeapWord*>(q) != compact_top || (size_t)q->size() != size) {
+  if (force_forward || cast_from_oop<HeapWord*>(q) != compact_top || (size_t)q->size() != size) {
+     q->forward_to(oop(compact_top));
+     assert(q->is_gc_marked(), "encoding the pointer should preserve the mark");
+   } else {
+@@ -501,7 +501,7 @@ bool CompactibleSpace::must_rescue(oop old_obj, oop new_obj) {
+ 
+   } else {
+     assert(space_index(old_obj) != space_index(new_obj), "old_obj and new_obj must be in different spaces");
+-    if (tenured_gen->is_in_reserved(new_obj)) {
+    if (new_in_tenured) {
+       // Must never rescue when moving from the new into the old generation.
+       assert(GenCollectedHeap::heap()->young_gen()->is_in_reserved(old_obj), "old_obj must be in DefNewGeneration");
+       assert(space_index(old_obj) > space_index(new_obj), "must be");
+@@ -824,14 +824,14 @@ void OffsetTableContigSpace::verify() const {
+ // Compute the forward sizes and leave out objects whose position could
+ // possibly overlap other objects.
+ HeapWord* CompactibleSpace::forward_with_rescue(HeapWord* q, size_t size,
+-                                                CompactPoint* cp, HeapWord* compact_top) {
+                                                CompactPoint* cp, HeapWord* compact_top, bool force_forward) {
+   size_t forward_size = size;
+ 
+   // (DCEVM) There is a new version of the class of q => different size
+   if (oop(q)->klass()->new_version() != NULL) {
+ 
+     size_t new_size = oop(q)->size_given_klass(oop(q)->klass()->new_version());
+-    assert(size != new_size, "instances without changed size have to be updated prior to GC run");
+    // assert(size != new_size, "instances without changed size have to be updated prior to GC run");
+     forward_size = new_size;
+   }
+ 
+@@ -845,7 +845,7 @@ HeapWord* CompactibleSpace::forward_with_rescue(HeapWord* q, size_t size,
+     return compact_top;
+   }
+ 
+-  return forward(oop(q), forward_size, cp, compact_top);
+  return forward(oop(q), forward_size, cp, compact_top, force_forward);
+ }
+ 
+ // Compute the forwarding addresses for the objects that need to be rescued.
+@@ -861,11 +861,11 @@ HeapWord* CompactibleSpace::forward_rescued(CompactPoint* cp, HeapWord* compact_
+       // (DCEVM) There is a new version of the class of q => different size
+       if (oop(q)->klass()->new_version() != NULL) {
+         size_t new_size = oop(q)->size_given_klass(oop(q)->klass()->new_version());
+-        assert(size != new_size, "instances without changed size have to be updated prior to GC run");
+        // assert(size != new_size, "instances without changed size have to be updated prior to GC run");
+         size = new_size;
+       }
+ 
+-      compact_top = cp->space->forward(oop(q), size, cp, compact_top);
+      compact_top = cp->space->forward(oop(q), size, cp, compact_top, true);
+       assert(compact_top <= end(), "must not write over end of space!");
+     }
+     MarkSweep::_rescued_oops->clear();
+diff --git a/src/hotspot/share/gc/shared/space.hpp b/src/hotspot/share/gc/shared/space.hpp
+index c9bfc365f0f..f7648995454 100644
+--- a/src/hotspot/share/gc/shared/space.hpp
+++ b/src/hotspot/share/gc/shared/space.hpp
+@@ -405,7 +405,7 @@ public:
+   virtual void prepare_for_compaction(CompactPoint* cp) = 0;
+   // MarkSweep support phase3
+   DEBUG_ONLY(int space_index(oop obj));
+-  bool must_rescue(oop old_obj, oop new_obj);
+  virtual bool must_rescue(oop old_obj, oop new_obj);
+   HeapWord* rescue(HeapWord* old_obj);
+   virtual void adjust_pointers();
+   // MarkSweep support phase4
+@@ -436,11 +436,11 @@ public:
+   // function of the then-current compaction space, and updates "cp->threshold
+   // accordingly".
+   virtual HeapWord* forward(oop q, size_t size, CompactPoint* cp,
+-                    HeapWord* compact_top);
+                    HeapWord* compact_top, bool force_forward);
+   // (DCEVM) same as forwad, but can rescue objects. Invoked only during
+   // redefinition runs
+   HeapWord* forward_with_rescue(HeapWord* q, size_t size, CompactPoint* cp,
+-                                HeapWord* compact_top);
+                                HeapWord* compact_top, bool force_forward);
+ 
+   HeapWord* forward_rescued(CompactPoint* cp, HeapWord* compact_top);
+ 
+diff --git a/src/hotspot/share/gc/shared/space.inline.hpp b/src/hotspot/share/gc/shared/space.inline.hpp
+index 5a93e93471b..fa645423685 100644
+--- a/src/hotspot/share/gc/shared/space.inline.hpp
+++ b/src/hotspot/share/gc/shared/space.inline.hpp
+@@ -163,6 +163,8 @@ inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* c
+   HeapWord* cur_obj = space->bottom();
+   HeapWord* scan_limit = space->scan_limit();
+ 
+  bool force_forward = false;
+
+   while (cur_obj < scan_limit) {
+     assert(!space->scanned_block_is_obj(cur_obj) ||
+            oop(cur_obj)->mark_raw().is_marked() || oop(cur_obj)->mark_raw().is_unlocked() ||
+@@ -174,14 +176,15 @@ inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* c
+       size_t size = space->scanned_block_size(cur_obj);
+ 
+       if (redefinition_run) {
+-        compact_top = cp->space->forward_with_rescue(cur_obj, size, cp, compact_top);
+        compact_top = cp->space->forward_with_rescue(cur_obj, size, cp, compact_top, force_forward);
+         if (first_dead == NULL && oop(cur_obj)->is_gc_marked()) {
+           /* Was moved (otherwise, forward would reset mark),
+              set first_dead to here */
+           first_dead = cur_obj;
+          force_forward = true;
+         }
+       } else {
+-        compact_top = cp->space->forward(oop(cur_obj), size, cp, compact_top);
+        compact_top = cp->space->forward(oop(cur_obj), size, cp, compact_top, false);
+       }
+ 
+       cur_obj += size;
+@@ -197,9 +200,9 @@ inline void CompactibleSpace::scan_and_forward(SpaceType* space, CompactPoint* c
+ 
+       // see if we might want to pretend this object is alive so that
+       // we don't have to compact quite as often.
+-      if (cur_obj == compact_top && dead_spacer.insert_deadspace(cur_obj, end)) {
+      if (!redefinition_run && cur_obj == compact_top && dead_spacer.insert_deadspace(cur_obj, end)) {
+         oop obj = oop(cur_obj);
+-        compact_top = cp->space->forward(obj, obj->size(), cp, compact_top);
+        compact_top = cp->space->forward(obj, obj->size(), cp, compact_top, force_forward);
+         end_of_live = end;
+       } else {
+         // otherwise, it really is a free region.
+@@ -362,8 +365,7 @@ inline void CompactibleSpace::scan_and_compact(SpaceType* space, bool redefiniti
+       Prefetch::write(compaction_top, copy_interval);
+ 
+       // copy object and reinit its mark
+-      assert(cur_obj != compaction_top || oop(cur_obj)->klass()->new_version() != NULL,
+-             "everything in this pass should be moving");
+      assert(redefinition_run || cur_obj != compaction_top, "everything in this pass should be moving");
+       if (redefinition_run && oop(cur_obj)->klass()->new_version() != NULL) {
+         Klass* new_version = oop(cur_obj)->klass()->new_version();
+         if (new_version->update_information() == NULL) {
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 718426f2819..1da6661dd3e 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -431,13 +431,11 @@ public:
+       Klass* new_klass = obj->klass()->new_version();
+ 
+       if (new_klass->update_information() != NULL) {
+-        int size_diff = obj->size() - obj->size_given_klass(new_klass);
+-
+-        // Either new size is bigger or gap is to small to be filled
+-        if (size_diff < 0 || (size_diff > 0 && (size_t) size_diff < CollectedHeap::min_fill_size())) {
+        if (obj->size() - obj->size_given_klass(new_klass) != 0) {
+           // We need an instance update => set back to old klass
+           _needs_instance_update = true;
+         } else {
+          // Either new size is bigger or gap is to small to be filled
+           oop src = obj;
+           if (new_klass->is_copying_backwards()) {
+             copy_to_tmp(obj);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0019-dcevm15-fix-java15-patch-compilation-issues.patch
+++ b/jb/project/tools/patches/dcevm/0019-dcevm15-fix-java15-patch-compilation-issues.patch
@@ -0,0 +1,942 @@
+From 297f564f6af79fb824f5b4e9119f1d3d0c827fb0 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 16 Nov 2020 20:20:12 +0100
+Subject: [PATCH 19/34] dcevm15 - fix java15 patch compilation issues
+
+---
+ .../share/classfile/classFileParser.hpp       |   8 +-
+ .../share/classfile/classLoaderData.cpp       |   2 +-
+ src/hotspot/share/classfile/dictionary.hpp    |  10 +-
+ src/hotspot/share/classfile/javaClasses.hpp   |   2 +
+ .../share/gc/g1/g1FullGCCompactTask.cpp       |   4 +-
+ .../share/gc/g1/g1FullGCCompactionPoint.cpp   |   8 +-
+ .../share/gc/g1/g1FullGCPrepareTask.cpp       |   4 +-
+ src/hotspot/share/gc/shared/dcevmSharedGC.cpp |  14 +-
+ src/hotspot/share/gc/shared/dcevmSharedGC.hpp |   2 +-
+ src/hotspot/share/gc/shared/gcConfig.cpp      |   2 +-
+ src/hotspot/share/gc/shared/space.cpp         |   4 +-
+ .../share/interpreter/linkResolver.cpp        |   2 +-
+ src/hotspot/share/oops/instanceKlass.cpp      |  17 ++-
+ src/hotspot/share/oops/instanceKlass.hpp      |   1 +
+ src/hotspot/share/oops/klass.cpp              |   8 +-
+ src/hotspot/share/prims/jvm.cpp               |   2 +
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 129 +++++++++---------
+ .../prims/jvmtiEnhancedRedefineClasses.hpp    |  14 +-
+ src/hotspot/share/prims/jvmtiEnv.cpp          |  11 +-
+ .../share/prims/jvmtiRedefineClasses.cpp      |   1 +
+ src/hotspot/share/prims/methodHandles.hpp     |   3 +
+ src/hotspot/share/runtime/arguments.cpp       |  22 +--
+ src/hotspot/share/runtime/mutexLocker.cpp     |   2 +-
+ 23 files changed, 159 insertions(+), 113 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/classFileParser.hpp b/src/hotspot/share/classfile/classFileParser.hpp
+index e5761e61767..0d266b9047e 100644
+--- a/src/hotspot/share/classfile/classFileParser.hpp
+++ b/src/hotspot/share/classfile/classFileParser.hpp
+@@ -150,9 +150,6 @@ class ClassFileParser {
+   const intArray* _method_ordering;
+   GrowableArray<Method*>* _all_mirandas;
+ 
+-  // Enhanced class redefinition
+-  const bool _pick_newest;
+-
+   enum { fixed_buffer_size = 128 };
+   u_char _linenumbertable_buffer[fixed_buffer_size];
+ 
+@@ -206,6 +203,9 @@ class ClassFileParser {
+   bool _has_vanilla_constructor;
+   int _max_bootstrap_specifier_index;  // detects BSS values
+ 
+  // (DCEVM) Enhanced class redefinition
+  const bool _pick_newest;
+
+   void parse_stream(const ClassFileStream* const stream, TRAPS);
+ 
+   void mangle_hidden_class_name(InstanceKlass* const ik);
+@@ -582,7 +582,7 @@ class ClassFileParser {
+   ClassLoaderData* loader_data() const { return _loader_data; }
+   const Symbol* class_name() const { return _class_name; }
+   const InstanceKlass* super_klass() const { return _super_klass; }
+-  Array<Klass*>* local_interfaces() const { return _local_interfaces; }
+  Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
+ 
+   ReferenceType reference_type() const { return _rt; }
+   AccessFlags access_flags() const { return _access_flags; }
+diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
+index 4d64c6b454a..aadcd50ef4a 100644
+--- a/src/hotspot/share/classfile/classLoaderData.cpp
+++ b/src/hotspot/share/classfile/classLoaderData.cpp
+@@ -597,7 +597,7 @@ void ClassLoaderData::exchange_holders(ClassLoaderData* cld) {
+   oop holder_oop = _holder.peek();
+   _holder.replace(cld->_holder.peek());
+   cld->_holder.replace(holder_oop);
+-  WeakHandle<vm_class_loader_data> exchange = _holder;
+  WeakHandle<vm_weak_data> exchange = _holder;
+   _holder = cld->_holder;
+   cld->_holder = exchange;
+ }
+diff --git a/src/hotspot/share/classfile/dictionary.hpp b/src/hotspot/share/classfile/dictionary.hpp
+index 114a983e783..a50f4ff84d2 100644
+--- a/src/hotspot/share/classfile/dictionary.hpp
+++ b/src/hotspot/share/classfile/dictionary.hpp
+@@ -84,6 +84,11 @@ public:
+   void print_on(outputStream* st) const;
+   void verify();
+ 
+  // (DCEVM) Enhanced class redefinition
+  bool update_klass(unsigned int hash, Symbol* name, ClassLoaderData* loader_data, InstanceKlass* k, InstanceKlass* old_klass);
+
+  void rollback_redefinition();
+
+  private:
+   DictionaryEntry* new_entry(unsigned int hash, InstanceKlass* klass);
+ 
+@@ -106,11 +111,6 @@ public:
+ 
+   void free_entry(DictionaryEntry* entry);
+ 
+-  // Enhanced class redefinition
+-  bool update_klass(unsigned int hash, Symbol* name, ClassLoaderData* loader_data, InstanceKlass* k, InstanceKlass* old_klass);
+-
+-  void rollback_redefinition();
+-
+   // (DCEVM) return old class if redefining in AllowEnhancedClassRedefinition, otherwise return "k"
+   static InstanceKlass* old_if_redefined(InstanceKlass* k) {
+     return (k != NULL && k->is_redefining()) ? ((InstanceKlass* )k->old_version()) : k;
+diff --git a/src/hotspot/share/classfile/javaClasses.hpp b/src/hotspot/share/classfile/javaClasses.hpp
+index a68c5139151..9abf2e1d105 100644
+--- a/src/hotspot/share/classfile/javaClasses.hpp
+++ b/src/hotspot/share/classfile/javaClasses.hpp
+@@ -255,7 +255,9 @@ class java_lang_Class : AllStatic {
+   static void set_init_lock(oop java_class, oop init_lock);
+   static void set_protection_domain(oop java_class, oop protection_domain);
+   static void set_class_loader(oop java_class, oop class_loader);
+ public: // DCEVM
+   static void set_component_mirror(oop java_class, oop comp_mirror);
+ private:
+   static void initialize_mirror_fields(Klass* k, Handle mirror, Handle protection_domain,
+                                        Handle classData, TRAPS);
+   static void initialize_mirror_fields(Klass* k, Handle mirror, Handle protection_domain, TRAPS);
+diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
+index f70f4606dc8..a22ed48560d 100644
+--- a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
+++ b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
+@@ -157,14 +157,14 @@ void G1FullGCCompactTask::serial_compaction_dcevm() {
+ 
+ size_t G1FullGCCompactTask::G1CompactRegionClosureDcevm::apply(oop obj) {
+   size_t size = obj->size();
+-  HeapWord* destination = (HeapWord*)obj->forwardee();
+  HeapWord* destination = cast_from_oop<HeapWord*>(obj->forwardee());
+   if (destination == NULL) {
+     // Object not moving
+     return size;
+   }
+ 
+   // copy object and reinit its mark
+-  HeapWord* obj_addr = (HeapWord*) obj;
+  HeapWord* obj_addr = cast_from_oop<HeapWord*>(obj);
+ 
+   if (!_rescue_oops_it->at_end() && **_rescue_oops_it == obj_addr) {
+     ++(*_rescue_oops_it);
+diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
+index 1e49571c999..755935a2c91 100644
+--- a/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
+++ b/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
+@@ -174,7 +174,7 @@ void G1FullGCCompactionPoint::forward_dcevm(oop object, size_t size, bool force_
+   assert(_current_region != NULL, "Must have been initialized");
+ 
+   // Store a forwarding pointer if the object should be moved.
+-  if ((HeapWord*)object != _compaction_top || force_forward) {
+  if (cast_from_oop<HeapWord*>(object) != _compaction_top || force_forward) {
+     object->forward_to(oop(_compaction_top));
+   } else {
+     if (object->forwardee() != NULL) {
+@@ -188,11 +188,11 @@ void G1FullGCCompactionPoint::forward_dcevm(oop object, size_t size, bool force_
+     } else {
+       // Make sure object has the correct mark-word set or that it will be
+       // fixed when restoring the preserved marks.
+-      assert(object->mark_raw() == markOopDesc::prototype_for_object(object) || // Correct mark
+-             object->mark_raw()->must_be_preserved(object) || // Will be restored by PreservedMarksSet
+      assert(object->mark_raw() == markWord::prototype_for_klass(object->klass()) || // Correct mark
+             object->mark_must_be_preserved() || // Will be restored by PreservedMarksSet
+              (UseBiasedLocking && object->has_bias_pattern_raw()), // Will be restored by BiasedLocking
+              "should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
+-             p2i(object), p2i(object->mark_raw()), p2i(markOopDesc::prototype_for_object(object)));
+             p2i(object), object->mark_raw().value(), markWord::prototype_for_klass(object->klass()).value());
+     }
+     assert(object->forwardee() == NULL, "should be forwarded to NULL");
+   }
+diff --git a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
+index a45681b60cf..2f06b9617e4 100644
+--- a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
+++ b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
+@@ -269,7 +269,7 @@ size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosureDcevm::apply(oop object)
+   HeapWord* compact_top = _cp->forward_compact_top(forward_size);
+ 
+   if (compact_top == NULL || must_rescue(object, oop(compact_top))) {
+-    _cp->rescued_oops()->append((HeapWord*)object);
+    _cp->rescued_oops()->append(cast_from_oop<HeapWord*>(object));
+   } else {
+     _cp->forward_dcevm(object, forward_size, (size != forward_size));
+   }
+@@ -295,7 +295,7 @@ bool G1FullGCPrepareTask::G1PrepareCompactLiveClosureDcevm::must_rescue(oop old_
+   int new_size = old_obj->size_given_klass(oop(old_obj)->klass()->new_version());
+   int original_size = old_obj->size();
+ 
+-  bool overlap = ((HeapWord*)old_obj + original_size < (HeapWord*)new_obj + new_size);
+  bool overlap = (cast_from_oop<HeapWord*>(old_obj) + original_size < cast_from_oop<HeapWord*>(new_obj) + new_size);
+ 
+   return overlap;
+ }
+diff --git a/src/hotspot/share/gc/shared/dcevmSharedGC.cpp b/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
+index 803e645f843..3dee097f1d3 100644
+--- a/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
+++ b/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
+@@ -58,10 +58,10 @@ void DcevmSharedGC::copy_rescued_objects_back(GrowableArray<HeapWord*>* rescued_
+           DcevmSharedGC::update_fields(rescued_obj, new_obj);
+         } else {
+           rescued_obj->set_klass(new_klass);
+-          Copy::aligned_disjoint_words((HeapWord*)rescued_obj, (HeapWord*)new_obj, size);
+          Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(rescued_obj), cast_from_oop<HeapWord*>(new_obj), size);
+         }
+       } else {
+-        Copy::aligned_disjoint_words((HeapWord*)rescued_obj, (HeapWord*)new_obj, size);
+        Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(rescued_obj), cast_from_oop<HeapWord*>(new_obj), size);
+       }
+ 
+       new_obj->init_mark_raw();
+@@ -111,11 +111,11 @@ void DcevmSharedGC::update_fields(oop q, oop new_location) {
+ 
+   // Save object somewhere, there is an overlap in fields
+   if (new_klass_oop->is_copying_backwards()) {
+-    if (((HeapWord *)q >= (HeapWord *)new_location && (HeapWord *)q < (HeapWord *)new_location + new_size) ||
+-        ((HeapWord *)new_location >= (HeapWord *)q && (HeapWord *)new_location < (HeapWord *)q + size)) {
+    if ((cast_from_oop<HeapWord*>(q) >= cast_from_oop<HeapWord*>(new_location) && cast_from_oop<HeapWord*>(q) < cast_from_oop<HeapWord*>(new_location) + new_size) ||
+        (cast_from_oop<HeapWord*>(new_location) >= cast_from_oop<HeapWord*>(q) && cast_from_oop<HeapWord*>(new_location) < cast_from_oop<HeapWord*>(q) + size)) {
+        tmp = NEW_RESOURCE_ARRAY(HeapWord, size);
+        q = (oop) tmp;
+-       Copy::aligned_disjoint_words((HeapWord*)tmp_obj, (HeapWord*)q, size);
+       Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(tmp_obj), cast_from_oop<HeapWord*>(q), size);
+     }
+   }
+ 
+@@ -131,13 +131,13 @@ void DcevmSharedGC::update_fields(oop q, oop new_location) {
+ 
+ void DcevmSharedGC::update_fields(oop new_location, oop tmp_obj, int *cur) {
+   assert(cur != NULL, "just checking");
+-  char* to = (char*)(HeapWord*)new_location;
+  char* to = (char*)cast_from_oop<HeapWord*>(new_location);
+   while (*cur != 0) {
+     int size = *cur;
+     if (size > 0) {
+       cur++;
+       int offset = *cur;
+-      HeapWord* from = (HeapWord*)(((char *)(HeapWord*)tmp_obj) + offset);
+      HeapWord* from = (HeapWord*)(((char *)cast_from_oop<HeapWord*>(tmp_obj)) + offset);
+       if (size == HeapWordSize) {
+         *((HeapWord*)to) = *from;
+       } else if (size == HeapWordSize * 2) {
+diff --git a/src/hotspot/share/gc/shared/dcevmSharedGC.hpp b/src/hotspot/share/gc/shared/dcevmSharedGC.hpp
+index e2ef0171fb2..a4e27e00280 100644
+--- a/src/hotspot/share/gc/shared/dcevmSharedGC.hpp
+++ b/src/hotspot/share/gc/shared/dcevmSharedGC.hpp
+@@ -29,7 +29,7 @@
+ #include "gc/shared/genOopClosures.hpp"
+ #include "gc/shared/taskqueue.hpp"
+ #include "memory/iterator.hpp"
+-#include "oops/markOop.hpp"
+#include "oops/markWord.hpp"
+ #include "oops/oop.hpp"
+ #include "runtime/timer.hpp"
+ #include "utilities/growableArray.hpp"
+diff --git a/src/hotspot/share/gc/shared/gcConfig.cpp b/src/hotspot/share/gc/shared/gcConfig.cpp
+index f01d64d1434..5c1a09390f1 100644
+--- a/src/hotspot/share/gc/shared/gcConfig.cpp
+++ b/src/hotspot/share/gc/shared/gcConfig.cpp
+@@ -100,7 +100,7 @@ void GCConfig::fail_if_non_included_gc_is_selected() {
+ void GCConfig::select_gc_ergonomically() {
+   if (AllowEnhancedClassRedefinition && !UseG1GC) {
+     // Enhanced class redefinition only supports serial GC at the moment
+-    FLAG_SET_ERGO(bool, UseSerialGC, true);
+    FLAG_SET_ERGO(UseSerialGC, true);
+   } else if (os::is_server_class_machine()) {
+ #if INCLUDE_G1GC
+     FLAG_SET_ERGO_IF_DEFAULT(UseG1GC, true);
+diff --git a/src/hotspot/share/gc/shared/space.cpp b/src/hotspot/share/gc/shared/space.cpp
+index 9772c32c42e..e8e3d7884c2 100644
+--- a/src/hotspot/share/gc/shared/space.cpp
+++ b/src/hotspot/share/gc/shared/space.cpp
+@@ -440,7 +440,7 @@ int CompactibleSpace::space_index(oop obj) {
+     index++;
+   }
+ 
+-  tty->print_cr("could not compute space_index for %08xh", (HeapWord*)obj);
+  tty->print_cr("could not compute space_index for %08xh", cast_from_oop<HeapWord*>(obj));
+   index = 0;
+ 
+   Generation* gen = heap->old_gen();
+@@ -485,7 +485,7 @@ bool CompactibleSpace::must_rescue(oop old_obj, oop new_obj) {
+   bool new_in_tenured = tenured_gen->is_in_reserved(new_obj);
+   if (old_in_tenured == new_in_tenured) {
+     // Rescue if object may overlap with a higher memory address.
+-    bool overlap = ((HeapWord*)old_obj + original_size < (HeapWord*)new_obj + new_size);
+    bool overlap = (cast_from_oop<HeapWord*>(old_obj) + original_size < cast_from_oop<HeapWord*>(new_obj) + new_size);
+     if (old_in_tenured) {
+       // Old and new address are in same space, so just compare the address.
+       // Must rescue if object moves towards the top of the space.
+diff --git a/src/hotspot/share/interpreter/linkResolver.cpp b/src/hotspot/share/interpreter/linkResolver.cpp
+index b2f24ddbeda..9daeeb70b34 100644
+--- a/src/hotspot/share/interpreter/linkResolver.cpp
+++ b/src/hotspot/share/interpreter/linkResolver.cpp
+@@ -1031,7 +1031,7 @@ void LinkResolver::resolve_field(fieldDescriptor& fd,
+         assert(m != NULL, "information about the current method must be available for 'put' bytecodes");
+         bool is_initialized_static_final_update = (byte == Bytecodes::_putstatic &&
+                                                    fd.is_static() &&
+-                                                   !(m()->is_static_initializer() || m()->name() == vmSymbols::ha_class_initializer_name()));
+                                                   !(m->is_static_initializer() || m->name() == vmSymbols::ha_class_initializer_name()));
+         bool is_initialized_instance_final_update = ((byte == Bytecodes::_putfield || byte == Bytecodes::_nofast_putfield) &&
+                                                      !fd.is_static() &&
+                                                      !m->is_object_initializer());
+diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
+index f8e60941046..5e40d78a87e 100644
+--- a/src/hotspot/share/oops/instanceKlass.cpp
+++ b/src/hotspot/share/oops/instanceKlass.cpp
+@@ -1316,7 +1316,7 @@ void InstanceKlass::init_implementor() {
+ // (DCEVM) - init_implementor() for dcevm
+ void InstanceKlass::init_implementor_from_redefine() {
+   assert(is_interface(), "not interface");
+-  Klass** addr = adr_implementor();
+  Klass* volatile* addr = adr_implementor();
+   assert(addr != NULL, "null addr");
+   if (addr != NULL) {
+     *addr = NULL;
+@@ -1659,6 +1659,21 @@ void InstanceKlass::methods_do(void f(Method* method)) {
+   }
+ }
+ 
+void InstanceKlass::methods_do(void f(Method* method, TRAPS), TRAPS) {
+  // Methods aren't stable until they are loaded.  This can be read outside
+  // a lock through the ClassLoaderData for profiling
+  if (!is_loaded()) {
+    return;
+  }
+
+  int len = methods()->length();
+  for (int index = 0; index < len; index++) {
+    Method* m = methods()->at(index);
+    assert(m->is_method(), "must be method");
+    f(m, CHECK);
+  }
+}
+
+ //  (DCEVM) Update information contains mapping of fields from old class to the new class.
+ //  Info is stored on HEAP, you need to call clear_update_information to free the space.
+ void InstanceKlass::store_update_information(GrowableArray<int> &values) {
+diff --git a/src/hotspot/share/oops/instanceKlass.hpp b/src/hotspot/share/oops/instanceKlass.hpp
+index 6ead9426728..b56d42cb177 100644
+--- a/src/hotspot/share/oops/instanceKlass.hpp
+++ b/src/hotspot/share/oops/instanceKlass.hpp
+@@ -1069,6 +1069,7 @@ public:
+   void clear_update_information();
+ 
+   void methods_do(void f(Method* method));
+  void methods_do(void f(Method* method, TRAPS), TRAPS);
+   void array_klasses_do(void f(Klass* k));
+   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
+ 
+diff --git a/src/hotspot/share/oops/klass.cpp b/src/hotspot/share/oops/klass.cpp
+index 352d8f84631..88f5ec9ba4a 100644
+--- a/src/hotspot/share/oops/klass.cpp
+++ b/src/hotspot/share/oops/klass.cpp
+@@ -200,13 +200,13 @@ void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word
+ Klass::Klass(KlassID id) : _id(id),
+                            _java_mirror(NULL),
+                            _prototype_header(markWord::prototype()),
+-                           _shared_class_path_index(-1),
+-                           _new_version(NULL),
+                            _old_version(NULL),
+                           _new_version(NULL),
+                           _redefinition_flags(Klass::NoRedefinition),
+                            _is_redefining(false),
+                           _update_information(NULL),
+                            _is_copying_backwards(false),
+-                           _redefinition_flags(Klass::NoRedefinition),
+-                           _update_information(NULL) {
+                           _shared_class_path_index(-1) {
+   CDS_ONLY(_shared_class_flags = 0;)
+   CDS_JAVA_HEAP_ONLY(_archived_mirror = 0;)
+   _primary_supers[0] = this;
+diff --git a/src/hotspot/share/prims/jvm.cpp b/src/hotspot/share/prims/jvm.cpp
+index 333b65ccfc1..13bcac352fb 100644
+--- a/src/hotspot/share/prims/jvm.cpp
+++ b/src/hotspot/share/prims/jvm.cpp
+@@ -1054,6 +1054,7 @@ static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *na
+                                                       class_loader,
+                                                       protection_domain,
+                                                       &st,
+                                                      NULL,
+                                                       CHECK_NULL);
+ 
+     if (log_is_enabled(Debug, class, resolve) && defined_k != NULL) {
+@@ -1074,6 +1075,7 @@ static jclass jvm_lookup_define_class(JNIEnv *env, jclass lookup, const char *na
+                                                class_loader,
+                                                &st,
+                                                cl_info,
+                                               NULL,
+                                                CHECK_NULL);
+     if (defined_k == NULL) {
+       THROW_MSG_0(vmSymbols::java_lang_Error(), "Failure to define a hidden class");
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 1da6661dd3e..619e3988e3a 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -24,11 +24,14 @@
+ 
+ #include "precompiled.hpp"
+ #include "aot/aotLoader.hpp"
+#include "classfile/classFileParser.hpp"
+ #include "classfile/classFileStream.hpp"
+ #include "classfile/metadataOnStackMark.hpp"
+ #include "classfile/systemDictionary.hpp"
+ #include "classfile/verifier.hpp"
+ #include "classfile/dictionary.hpp"
+#include "classfile/classLoaderDataGraph.hpp"
+#include "interpreter/linkResolver.hpp"
+ #include "interpreter/oopMapCache.hpp"
+ #include "interpreter/rewriter.hpp"
+ #include "logging/logStream.hpp"
+@@ -37,17 +40,22 @@
+ #include "memory/resourceArea.hpp"
+ #include "memory/iterator.inline.hpp"
+ #include "oops/fieldStreams.hpp"
+#include "oops/fieldStreams.inline.hpp"
+ #include "oops/klassVtable.hpp"
+ #include "oops/oop.inline.hpp"
+ #include "oops/constantPool.inline.hpp"
+#include "oops/metadata.hpp"
+#include "oops/methodData.hpp"
+ #include "prims/jvmtiImpl.hpp"
+ #include "prims/jvmtiClassFileReconstituter.hpp"
+ #include "prims/jvmtiEnhancedRedefineClasses.hpp"
+ #include "prims/methodComparator.hpp"
+ #include "prims/resolvedMethodTable.hpp"
+#include "prims/methodHandles.hpp"
+ #include "runtime/deoptimization.hpp"
+ #include "runtime/jniHandles.inline.hpp"
+ #include "runtime/relocator.hpp"
+#include "runtime/fieldDescriptor.hpp"
+ #include "runtime/fieldDescriptor.inline.hpp"
+ #include "utilities/bitMap.inline.hpp"
+ #include "prims/jvmtiThreadState.inline.hpp"
+@@ -55,6 +63,8 @@
+ #include "oops/constantPool.inline.hpp"
+ #include "gc/g1/g1CollectedHeap.hpp"
+ #include "gc/shared/dcevmSharedGC.hpp"
+#include "gc/shared/scavengableNMethods.hpp"
+#include "ci/ciObjectFactory.hpp"
+ 
+ Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
+ Array<Method*>* VM_EnhancedRedefineClasses::_new_methods = NULL;
+@@ -66,6 +76,7 @@ int         VM_EnhancedRedefineClasses::_matching_methods_length = 0;
+ int         VM_EnhancedRedefineClasses::_deleted_methods_length  = 0;
+ int         VM_EnhancedRedefineClasses::_added_methods_length    = 0;
+ Klass*      VM_EnhancedRedefineClasses::_the_class_oop = NULL;
+u8        VM_EnhancedRedefineClasses::_id_counter = 0;
+ 
+ //
+ // Create new instance of enhanced class redefiner.
+@@ -88,6 +99,7 @@ VM_EnhancedRedefineClasses::VM_EnhancedRedefineClasses(jint class_count, const j
+   _class_load_kind = class_load_kind;
+   _res = JVMTI_ERROR_NONE;
+   _any_class_has_resolved_methods = false;
+  _id = next_id();
+ }
+ 
+ static inline InstanceKlass* get_ik(jclass def) {
+@@ -211,9 +223,7 @@ class FieldCopier : public FieldClosure {
+ 
+ // TODO: review...
+ void VM_EnhancedRedefineClasses::mark_as_scavengable(nmethod* nm) {
+-  if (!nm->on_scavenge_root_list()) {
+-    CodeCache::add_scavenge_root_nmethod(nm);
+-  }
+  ScavengableNMethods::register_nmethod(nm);
+ }
+ 
+ void VM_EnhancedRedefineClasses::unregister_nmethod_g1(nmethod* nm) {
+@@ -414,7 +424,7 @@ public:
+       _tmp_obj_size = size;
+       _tmp_obj = (oop)resource_allocate_bytes(size * HeapWordSize);
+     }
+-    Copy::aligned_disjoint_words((HeapWord*)o, (HeapWord*)_tmp_obj, size);
+    Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(o), cast_from_oop<HeapWord*>(_tmp_obj), size);
+   }
+ 
+   virtual void do_object(oop obj) {
+@@ -505,9 +515,6 @@ void VM_EnhancedRedefineClasses::doit() {
+     ClearCpoolCacheAndUnpatch clear_cpool_cache(thread);
+     ClassLoaderDataGraph::classes_do(&clear_cpool_cache);
+ 
+-
+-    // SystemDictionary::methods_do(fix_invoke_method);
+-
+   // JSR-292 support
+   if (_any_class_has_resolved_methods) {
+     bool trace_name_printed = false;
+@@ -564,8 +571,8 @@ void VM_EnhancedRedefineClasses::doit() {
+     InstanceKlass* old = InstanceKlass::cast(cur->old_version());
+ 
+     // Swap marks to have same hashcodes
+-    markOop cur_mark = cur->prototype_header();
+-    markOop old_mark = old->prototype_header();
+    markWord cur_mark = cur->prototype_header();
+    markWord old_mark = old->prototype_header();
+     cur->set_prototype_header(old_mark);
+     old->set_prototype_header(cur_mark);
+ 
+@@ -579,14 +586,14 @@ void VM_EnhancedRedefineClasses::doit() {
+       // Revert pool holder for old version of klass (it was updated by one of ours closure!)
+     old->constants()->set_pool_holder(old);
+ 
+-    Klass* array_klasses = old->array_klasses();
+    ObjArrayKlass* array_klasses = old->array_klasses();
+     if (array_klasses != NULL) {
+       assert(cur->array_klasses() == NULL, "just checking");
+ 
+       // Transfer the array classes, otherwise we might get cast exceptions when casting array types.
+       // Also, set array klasses element klass.
+       cur->set_array_klasses(array_klasses);
+-      ObjArrayKlass::cast(array_klasses)->set_element_klass(cur);
+      array_klasses->set_element_klass(cur);
+       java_lang_Class::release_set_array_klass(cur->java_mirror(), array_klasses);
+       java_lang_Class::set_component_mirror(array_klasses->java_mirror(), cur->java_mirror());
+     }
+@@ -641,11 +648,15 @@ void VM_EnhancedRedefineClasses::doit() {
+   //ClassLoaderDataGraph::classes_do(&clean_weak_method_links);
+ 
+   // Disable any dependent concurrent compilations
+-  SystemDictionary::notice_modification();
+  // SystemDictionary::notice_modification();
+
+  JvmtiExport::increment_redefinition_count();
+ 
+   // Set flag indicating that some invariants are no longer true.
+   // See jvmtiExport.hpp for detailed explanation.
+-  JvmtiExport::set_has_redefined_a_class();
+
+  // dcevm15: handled by _redefinition_count
+  // JvmtiExport::set_has_redefined_a_class();
+ 
+ #ifdef PRODUCT
+   if (log_is_enabled(Trace, redefine, class, obsolete, metadata)) {
+@@ -718,7 +729,7 @@ bool VM_EnhancedRedefineClasses::is_modifiable_class(oop klass_mirror) {
+   }
+ 
+   // Cannot redefine or retransform an anonymous class.
+-  if (InstanceKlass::cast(k)->is_anonymous()) {
+  if (InstanceKlass::cast(k)->is_unsafe_anonymous()) {
+     return false;
+   }
+   return true;
+@@ -804,22 +815,30 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
+ 
+     InstanceKlass* k;
+ 
+-    if (InstanceKlass::cast(the_class)->is_anonymous()) {
+-      const InstanceKlass* host_class = the_class->host_klass();
+    if (InstanceKlass::cast(the_class)->is_unsafe_anonymous()) {
+      const InstanceKlass* host_class = the_class->unsafe_anonymous_host();
+ 
+       // Make sure it's the real host class, not another anonymous class.
+-      while (host_class != NULL && host_class->is_anonymous()) {
+-        host_class = host_class->host_klass();
+      while (host_class != NULL && host_class->is_unsafe_anonymous()) {
+        host_class = host_class->unsafe_anonymous_host();
+       }
+ 
+      ClassLoadInfo cl_info(protection_domain,
+                            host_class,
+                            NULL,     // dynamic_nest_host
+                            NULL,     // cp_patches
+                            Handle(), // classData
+                            false,    // is_hidden
+                            false,    // is_strong_hidden
+                            true);    // FIXME: check if correct. can_access_vm_annotations
+
+       k = SystemDictionary::parse_stream(the_class_sym,
+                                          the_class_loader,
+-                                         protection_domain,
+                                          &st,
+-                                         host_class,
+                                         cl_info,
+                                          the_class,
+-                                         NULL,
+                                          THREAD);
+
+       k->class_loader_data()->exchange_holders(the_class->class_loader_data());
+       the_class->class_loader_data()->inc_keep_alive();
+     } else {
+@@ -966,7 +985,7 @@ int VM_EnhancedRedefineClasses::calculate_redefinition_flags(InstanceKlass* new_
+   // Check interfaces
+ 
+   // Interfaces removed?
+-  Array<Klass*>* old_interfaces = the_class->transitive_interfaces();
+  Array<InstanceKlass*>* old_interfaces = the_class->transitive_interfaces();
+   for (i = 0; i < old_interfaces->length(); i++) {
+     InstanceKlass* old_interface = InstanceKlass::cast(old_interfaces->at(i));
+     if (!new_class->implements_interface_any_version(old_interface)) {
+@@ -976,7 +995,7 @@ int VM_EnhancedRedefineClasses::calculate_redefinition_flags(InstanceKlass* new_
+   }
+ 
+   // Interfaces added?
+-  Array<Klass*>* new_interfaces = new_class->transitive_interfaces();
+  Array<InstanceKlass*>* new_interfaces = new_class->transitive_interfaces();
+   for (i = 0; i<new_interfaces->length(); i++) {
+     if (!the_class->implements_interface_any_version(new_interfaces->at(i))) {
+       result = result | Klass::ModifyClass;
+@@ -1389,8 +1408,8 @@ void VM_EnhancedRedefineClasses::rollback() {
+ // Rewrite faster byte-codes back to their slower equivalent. Undoes rewriting happening in templateTable_xxx.cpp
+ // The reason is that once we zero cpool caches, we need to re-resolve all entries again. Faster bytecodes do not
+ // do that, they assume that cache entry is resolved already.
+-void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method) {
+-  RawBytecodeStream bcs(method);
+void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method, TRAPS) {
+  RawBytecodeStream bcs(methodHandle(THREAD, method));
+   Bytecodes::Code code;
+   Bytecodes::Code java_code;
+   while (!bcs.is_last_bytecode()) {
+@@ -1454,11 +1473,11 @@ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
+   HandleMark hm(_thread);
+   InstanceKlass *ik = InstanceKlass::cast(k);
+ 
+-  constantPoolHandle other_cp = constantPoolHandle(ik->constants());
+  constantPoolHandle other_cp = constantPoolHandle(_thread, ik->constants());
+ 
+   // Update host klass of anonymous classes (for example, produced by lambdas) to newest version.
+-  if (ik->is_anonymous() && ik->host_klass()->new_version() != NULL) {
+-    ik->set_host_klass(InstanceKlass::cast(ik->host_klass()->newest_version()));
+  if (ik->is_unsafe_anonymous() && ik->unsafe_anonymous_host()->new_version() != NULL) {
+    ik->set_unsafe_anonymous_host(InstanceKlass::cast(ik->unsafe_anonymous_host()->newest_version()));
+   }
+ 
+   // Update implementor if there is only one, in this case implementor() can reference old class
+@@ -1492,7 +1511,18 @@ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
+ 
+   // If bytecode rewriting is enabled, we also need to unpatch bytecode to force resolution of zeroed entries
+   if (RewriteBytecodes) {
+-    ik->methods_do(unpatch_bytecode);
+    ik->methods_do(unpatch_bytecode, _thread);
+  }
+}
+
+u8 VM_EnhancedRedefineClasses::next_id() {
+  while (true) {
+    u8 id = _id_counter;
+    u8 next_id = id + 1;
+    u8 result = Atomic::cmpxchg(&_id_counter, id, next_id);
+    if (result == id) {
+      return next_id;
+    }
+   }
+ }
+ 
+@@ -1512,31 +1542,8 @@ void VM_EnhancedRedefineClasses::MethodDataCleaner::do_klass(Klass* k) {
+   }
+ }
+ 
+-void VM_EnhancedRedefineClasses::fix_invoke_method(Method* method) {
+-
+-  constantPoolHandle other_cp = constantPoolHandle(method->constants());
+-
+-  for (int i = 0; i < other_cp->length(); i++) {
+-    if (other_cp->tag_at(i).is_klass()) {
+-      Klass* klass = other_cp->resolved_klass_at(i);
+-      if (klass->new_version() != NULL) {
+-        // Constant pool entry points to redefined class -- update to the new version
+-        other_cp->klass_at_put(i, klass->newest_version());
+-      }
+-      assert(other_cp->resolved_klass_at(i)->new_version() == NULL, "Must be new klass!");
+-    }
+-  }
+-
+-  ConstantPoolCache* cp_cache = other_cp->cache();
+-  if (cp_cache != NULL) {
+-    cp_cache->clear_entries();
+-  }
+-
+-}
+-
+ 
+-
+-void VM_EnhancedRedefineClasses::update_jmethod_ids() {
+void VM_EnhancedRedefineClasses::update_jmethod_ids(TRAPS) {
+   for (int j = 0; j < _matching_methods_length; ++j) {
+     Method* old_method = _matching_old_methods[j];
+     jmethodID jmid = old_method->find_jmethod_id_or_null();
+@@ -1547,10 +1554,10 @@ void VM_EnhancedRedefineClasses::update_jmethod_ids() {
+ 
+     if (jmid != NULL) {
+       // There is a jmethodID, change it to point to the new method
+-      methodHandle new_method_h(_matching_new_methods[j]);
+      methodHandle new_method_h(THREAD, _matching_new_methods[j]);
+ 
+       if (old_method->new_version() == NULL) {
+-        methodHandle old_method_h(_matching_old_methods[j]);
+        methodHandle old_method_h(THREAD, _matching_old_methods[j]);
+         jmethodID new_jmethod_id = Method::make_jmethod_id(old_method_h->method_holder()->class_loader_data(), old_method_h());
+         bool result = InstanceKlass::cast(old_method_h->method_holder())->update_jmethod_id(old_method_h(), new_jmethod_id);
+       } else {
+@@ -1887,7 +1894,7 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
+ 
+   // track number of methods that are EMCP for add_previous_version() call below
+   check_methods_and_mark_as_obsolete();
+-  update_jmethod_ids();
+  update_jmethod_ids(THREAD);
+ 
+   _any_class_has_resolved_methods = the_class->has_resolved_methods() || _any_class_has_resolved_methods;
+ 
+@@ -2119,12 +2126,12 @@ jvmtiError VM_EnhancedRedefineClasses::do_topological_class_sorting(TRAPS) {
+ 
+     Handle protection_domain(THREAD, klass->protection_domain());
+ 
+    ClassLoadInfo cl_info(protection_domain);
+
+     ClassFileParser parser(&st,
+                            klass->name(),
+                            klass->class_loader_data(),
+-                           protection_domain,
+-                           NULL, // host_klass
+-                           NULL, // cp_patches
+                           &cl_info,
+                            ClassFileParser::INTERNAL, // publicity level
+                            true,
+                            THREAD);
+@@ -2134,7 +2141,7 @@ jvmtiError VM_EnhancedRedefineClasses::do_topological_class_sorting(TRAPS) {
+       links.append(KlassPair(super_klass, klass));
+     }
+ 
+-    Array<Klass*>* local_interfaces = parser.local_interfaces();
+    Array<InstanceKlass*>* local_interfaces = parser.local_interfaces();
+     for (int j = 0; j < local_interfaces->length(); j++) {
+       Klass* iface = local_interfaces->at(j);
+       if (iface != NULL && _affected_klasses->contains(iface)) {
+@@ -2157,7 +2164,7 @@ jvmtiError VM_EnhancedRedefineClasses::do_topological_class_sorting(TRAPS) {
+         links.append(KlassPair(super_klass, klass));
+       }
+ 
+-      Array<Klass*>* local_interfaces = klass->local_interfaces();
+      Array<InstanceKlass*>* local_interfaces = klass->local_interfaces();
+       for (int j = 0; j < local_interfaces->length(); j++) {
+         Klass* interfaceKlass = local_interfaces->at(j);
+         if (_affected_klasses->contains(interfaceKlass)) {
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index 4c0412d343d..0066088b3b0 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -32,7 +32,7 @@
+ #include "memory/resourceArea.hpp"
+ #include "oops/objArrayKlass.hpp"
+ #include "oops/objArrayOop.hpp"
+-#include "gc/shared/vmGCOperations.hpp"
+#include "gc/shared/gcVMOperations.hpp"
+ #include "../../../java.base/unix/native/include/jni_md.h"
+ 
+ //
+@@ -59,6 +59,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   static int             _deleted_methods_length;
+   static int             _added_methods_length;
+   static Klass*          _the_class_oop;
+  static u8              _id_counter;
+ 
+   // The instance fields are used to pass information from
+   // doit_prologue() to doit() and doit_epilogue().
+@@ -91,6 +92,9 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   elapsedTimer  _timer_heap_iterate;
+   elapsedTimer  _timer_heap_full_gc;
+ 
+  // Redefinition id used by JFR
+  u8 _id;
+
+   // These routines are roughly in call order unless otherwise noted.
+ 
+   // Load and link new classes (either redefined or affected by redefinition - subclass, ...)
+@@ -118,15 +122,14 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   static void mark_as_scavengable(nmethod* nm);
+   static void unregister_nmethod_g1(nmethod* nm);
+   static void register_nmethod_g1(nmethod* nm);
+-  static void unpatch_bytecode(Method* method);
+-  static void fix_invoke_method(Method* method);
+  static void unpatch_bytecode(Method* method, TRAPS);
+ 
+   // Figure out which new methods match old methods in name and signature,
+   // which methods have been added, and which are no longer present
+   void compute_added_deleted_matching_methods();
+ 
+   // Change jmethodIDs to point to the new methods
+-  void update_jmethod_ids();
+  void update_jmethod_ids(TRAPS);
+ 
+   // marking methods as old and/or obsolete
+   void check_methods_and_mark_as_obsolete();
+@@ -141,6 +144,8 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+ 
+   void flush_dependent_code(InstanceKlass* k_h, TRAPS);
+ 
+  u8 next_id();
+
+   static void check_class(InstanceKlass* k_oop, TRAPS);
+ 
+   static void dump_methods();
+@@ -181,6 +186,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+ 
+   bool allow_nested_vm_operations() const        { return true; }
+   jvmtiError check_error()                       { return _res; }
+  u8 id()                                        { return _id; }
+ 
+   // Modifiable test must be shared between IsModifiableClass query
+   // and redefine implementation
+diff --git a/src/hotspot/share/prims/jvmtiEnv.cpp b/src/hotspot/share/prims/jvmtiEnv.cpp
+index b6838ac034d..fba0f48abd7 100644
+--- a/src/hotspot/share/prims/jvmtiEnv.cpp
+++ b/src/hotspot/share/prims/jvmtiEnv.cpp
+@@ -456,20 +456,23 @@ JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
+ 
+   EventRetransformClasses event;
+   jvmtiError error;
+  u8 op_id;
+ 
+   if (AllowEnhancedClassRedefinition) {
+     MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
+     VMThread::execute(&op);
+    op_id = op.id();
+     error = (op.check_error());
+   } else {
+     VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
+     VMThread::execute(&op);
+    op_id = op.id();
+     error = op.check_error();
+   }
+   if (error == JVMTI_ERROR_NONE) {
+     event.set_classCount(class_count);
+-    event.set_redefinitionId(op.id());
+    event.set_redefinitionId(op_id);
+     event.commit();
+   }
+   return error;
+@@ -484,19 +487,23 @@ JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_de
+   EventRedefineClasses event;
+   jvmtiError error;
+ 
+  u8 op_id;
+
+   if (AllowEnhancedClassRedefinition) {
+     MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
+     VMThread::execute(&op);
+    op_id = op.id();
+     error = (op.check_error());
+   } else {
+     VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
+     VMThread::execute(&op);
+    op_id = op.id();
+     error = op.check_error();
+   }
+   if (error == JVMTI_ERROR_NONE) {
+     event.set_classCount(class_count);
+-    event.set_redefinitionId(op.id());
+    event.set_redefinitionId(op_id);
+     event.commit();
+   }
+   return error;
+diff --git a/src/hotspot/share/prims/jvmtiRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
+index a7840848e10..346eac7c431 100644
+--- a/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
+@@ -1271,6 +1271,7 @@ jvmtiError VM_RedefineClasses::load_new_class_versions(TRAPS) {
+                                                       the_class_loader,
+                                                       &st,
+                                                       cl_info,
+                                                      NULL,
+                                                       THREAD);
+     // Clear class_being_redefined just to be sure.
+     state->clear_class_being_redefined();
+diff --git a/src/hotspot/share/prims/methodHandles.hpp b/src/hotspot/share/prims/methodHandles.hpp
+index 54f36202a5f..917d31efd77 100644
+--- a/src/hotspot/share/prims/methodHandles.hpp
+++ b/src/hotspot/share/prims/methodHandles.hpp
+@@ -180,6 +180,9 @@ public:
+     assert(ref_kind_is_valid(ref_kind), "");
+     return (ref_kind & 1) != 0;
+   }
+  static bool ref_kind_is_static(int ref_kind) {
+    return !ref_kind_has_receiver(ref_kind) && (ref_kind != JVM_REF_newInvokeSpecial);
+  }
+ 
+   static int ref_kind_to_flags(int ref_kind);
+ 
+diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
+index d05a2893498..3a92b8869dc 100644
+--- a/src/hotspot/share/runtime/arguments.cpp
+++ b/src/hotspot/share/runtime/arguments.cpp
+@@ -2128,13 +2128,15 @@ bool Arguments::check_gc_consistency() {
+   // of collectors.
+   uint i = 0;
+   if (UseSerialGC)                       i++;
+-  if (UseConcMarkSweepGC)                i++;
+-  if (UseParallelGC || UseParallelOldGC) i++;
+  if (UseParallelGC)                     i++;
+   if (UseG1GC)                           i++;
+  if (UseEpsilonGC)                      i++;
+  if (UseZGC)                            i++;
+  if (UseShenandoahGC)                   i++;
+   if (AllowEnhancedClassRedefinition) {
+     // Must use serial GC. This limitation applies because the instance size changing GC modifications
+     // are only built into the mark and compact algorithm.
+-    if ((!UseSerialGC && !UseG1GC) && i >= 1) {
+    if (!UseSerialGC && !UseG1GC && i >= 1) {
+       jio_fprintf(defaultStream::error_stream(),
+                   "Must use the Serial or G1 GC with enhanced class redefinition.\n");
+       return false;
+@@ -4494,18 +4496,18 @@ void Arguments::setup_hotswap_agent() {
+ 
+   // TODO: open it only for org.hotswap.agent module
+   // Use to access java.lang.reflect.Proxy/proxyCache
+-  create_numbered_property("jdk.module.addopens", "java.base/java.lang=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.base/java.lang=ALL-UNNAMED", addopens_count++);
+   // Class of  field java.lang.reflect.Proxy/proxyCache
+-  create_numbered_property("jdk.module.addopens", "java.base/jdk.internal.loader=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.base/jdk.internal.loader=ALL-UNNAMED", addopens_count++);
+   // Use to access java.io.Reader, java.io.InputStream, java.io.FileInputStream
+-  create_numbered_property("jdk.module.addopens", "java.base/java.io=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.base/java.io=ALL-UNNAMED", addopens_count++);
+   // java.beans.Introspector access
+-  create_numbered_property("jdk.module.addopens", "java.desktop/java.beans=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.desktop/java.beans=ALL-UNNAMED", addopens_count++);
+   // java.beans.Introspector access
+-  create_numbered_property("jdk.module.addopens", "java.desktop/com.sun.beans=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.desktop/com.sun.beans=ALL-UNNAMED", addopens_count++);
+   // com.sun.beans.introspect.ClassInfo access
+-  create_numbered_property("jdk.module.addopens", "java.desktop/com.sun.beans.introspect=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.desktop/com.sun.beans.introspect=ALL-UNNAMED", addopens_count++);
+   // com.sun.beans.introspect.util.Cache access
+-  create_numbered_property("jdk.module.addopens", "java.desktop/com.sun.beans.util=ALL-UNNAMED", addopens_count++);
+  create_numbered_module_property("jdk.module.addopens", "java.desktop/com.sun.beans.util=ALL-UNNAMED", addopens_count++);
+ 
+ }
+diff --git a/src/hotspot/share/runtime/mutexLocker.cpp b/src/hotspot/share/runtime/mutexLocker.cpp
+index 6f982072909..14a3ed730fe 100644
+--- a/src/hotspot/share/runtime/mutexLocker.cpp
+++ b/src/hotspot/share/runtime/mutexLocker.cpp
+@@ -287,7 +287,7 @@ void mutex_init() {
+   def(InitCompleted_lock           , PaddedMonitor, leaf,        true,  _safepoint_check_never);
+   def(VtableStubs_lock             , PaddedMutex  , nonleaf,     true,  _safepoint_check_never);
+   def(Notify_lock                  , PaddedMonitor, nonleaf,     true,  _safepoint_check_always);
+-  def(EnhancedRedefineClasses_lock , PaddedMutex  , nonleaf+7,   false, Monitor::_safepoint_check_always);     // for ensuring that class redefinition is not done in parallel
+  def(EnhancedRedefineClasses_lock , PaddedMutex  , nonleaf+7,   false, _safepoint_check_always);     // for ensuring that class redefinition is not done in parallel
+   def(JNICritical_lock             , PaddedMonitor, nonleaf,     true,  _safepoint_check_always); // used for JNI critical regions
+   def(AdapterHandlerLibrary_lock   , PaddedMutex  , nonleaf,     true,  _safepoint_check_always);
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0020-dcevm15-G1-fixes.patch
+++ b/jb/project/tools/patches/dcevm/0020-dcevm15-G1-fixes.patch
@@ -0,0 +1,25 @@
+From 336cab4f72c6e642e3077ea8d1a4860de33f5a4d Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Tue, 17 Nov 2020 17:40:24 +0100
+Subject: [PATCH 20/34] dcevm15 - G1 fixes
+
+---
+ src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
+index 2f06b9617e4..476728a5d26 100644
+--- a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
+++ b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
+@@ -240,7 +240,7 @@ void G1FullGCPrepareTask::prepare_serial_compaction_dcevm() {
+ 
+     // collect remaining, not forwarded rescued oops using serial compact point
+     while (cp->last_rescued_oop() < cp->rescued_oops()->length()) {
+-      HeapRegion* hr = G1CollectedHeap::heap()->new_region(HeapRegion::GrainBytes / HeapWordSize, false, true);
+      HeapRegion* hr = G1CollectedHeap::heap()->new_region(HeapRegion::GrainBytes / HeapWordSize, HeapRegionType::Eden, true, G1NUMA::AnyNodeIndex);
+       if (hr == NULL) {
+         vm_exit_out_of_memory(0, OOM_MMAP_ERROR, "G1 - not enough of free regions after redefinition.");
+       }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0021-dcevm15-Fix-flush-dependent-code.patch
+++ b/jb/project/tools/patches/dcevm/0021-dcevm15-Fix-flush-dependent-code.patch
@@ -0,0 +1,133 @@
+From cea4e2cca3c37233c728be7235f8f9d8be136cb5 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Tue, 17 Nov 2020 18:52:57 +0100
+Subject: [PATCH 21/34] dcevm15 - Fix flush dependent code
+
+---
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 57 +++++++------------
+ .../prims/jvmtiEnhancedRedefineClasses.hpp    |  4 +-
+ 2 files changed, 25 insertions(+), 36 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 619e3988e3a..efaf11e1666 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -508,7 +508,7 @@ void VM_EnhancedRedefineClasses::doit() {
+ 
+   // Deoptimize all compiled code that depends on this class (do only once, because it clears whole cache)
+   // if (_max_redefinition_flags > Klass::ModifyClass) {
+-    flush_dependent_code(NULL, thread);
+    flush_dependent_code(thread);
+   // }
+ 
+     // Adjust constantpool caches for all classes that reference methods of the evolved class.
+@@ -647,17 +647,8 @@ void VM_EnhancedRedefineClasses::doit() {
+   //MethodDataCleaner clean_weak_method_links;
+   //ClassLoaderDataGraph::classes_do(&clean_weak_method_links);
+ 
+-  // Disable any dependent concurrent compilations
+-  // SystemDictionary::notice_modification();
+-
+   JvmtiExport::increment_redefinition_count();
+ 
+-  // Set flag indicating that some invariants are no longer true.
+-  // See jvmtiExport.hpp for detailed explanation.
+-
+-  // dcevm15: handled by _redefinition_count
+-  // JvmtiExport::set_has_redefined_a_class();
+-
+ #ifdef PRODUCT
+   if (log_is_enabled(Trace, redefine, class, obsolete, metadata)) {
+ #endif
+@@ -1746,6 +1737,18 @@ void VM_EnhancedRedefineClasses::transfer_old_native_function_registrations(Inst
+   transfer.transfer_registrations(_matching_old_methods, _matching_methods_length);
+ }
+ 
+// First step is to walk the code cache for each class redefined and mark
+// dependent methods.  Wait until all classes are processed to deoptimize everything.
+void VM_EnhancedRedefineClasses::mark_dependent_code(InstanceKlass* ik) {
+  assert_locked_or_safepoint(Compile_lock);
+
+  // All dependencies have been recorded from startup or this is a second or
+  // subsequent use of RedefineClasses
+  if (0 && JvmtiExport::all_dependencies_are_recorded()) {
+    CodeCache::mark_for_evol_deoptimization(ik);
+  }
+}
+
+ // DCEVM - it always deoptimizes everything! (because it is very difficult to find only correct dependencies)
+ // Deoptimize all compiled code that depends on this class.
+ //
+@@ -1762,33 +1765,21 @@ void VM_EnhancedRedefineClasses::transfer_old_native_function_registrations(Inst
+ // subsequent calls to RedefineClasses need only throw away code
+ // that depends on the class.
+ //
+-void VM_EnhancedRedefineClasses::flush_dependent_code(InstanceKlass* k_h, TRAPS) {
+void VM_EnhancedRedefineClasses::flush_dependent_code(TRAPS) {
+   assert_locked_or_safepoint(Compile_lock);
+ 
+   // All dependencies have been recorded from startup or this is a second or
+   // subsequent use of RedefineClasses
+   // FIXME: for now, deoptimize all!
+-  if (0 && k_h != NULL && JvmtiExport::all_dependencies_are_recorded()) {
+-    CodeCache::flush_evol_dependents_on(k_h);
+-    Klass* superCl = k_h->super();
+-    // Deoptimize super classes since redefined class can has a new method override
+-    while (superCl != NULL && !superCl->is_redefining()) {
+-      CodeCache::flush_evol_dependents_on(InstanceKlass::cast(superCl));
+-      superCl = superCl->super();
+  if (0 && JvmtiExport::all_dependencies_are_recorded()) {
+    int deopt = CodeCache::mark_dependents_for_evol_deoptimization();
+    log_debug(redefine, class, nmethod)("Marked %d dependent nmethods for deopt", deopt);
+    if (deopt != 0) {
+      CodeCache::flush_evol_dependents();
+     }
+   } else {
+-    CodeCache::mark_all_nmethods_for_deoptimization();
+-
+-    ResourceMark rm(THREAD);
+-    DeoptimizationMarker dm;
+-
+-    // Deoptimize all activations depending on marked nmethods
+-    Deoptimization::deoptimize_dependents();
+-
+-    // Make the dependent methods not entrant
+-    CodeCache::make_marked_nmethods_not_entrant();
+-
+-    // From now on we know that the dependency information is complete
+    CodeCache::mark_all_nmethods_for_evol_deoptimization();
+    CodeCache::flush_evol_dependents();
+     JvmtiExport::set_all_dependencies_are_recorded(true);
+   }
+ }
+@@ -1881,11 +1872,7 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
+   JvmtiBreakpoints& jvmti_breakpoints = JvmtiCurrentBreakpoints::get_jvmti_breakpoints();
+   jvmti_breakpoints.clearall_in_class_at_safepoint(the_class);
+ 
+-  // DCEVM Deoptimization is always for whole java world, call only once after all classes are redefined
+-  // Deoptimize all compiled code that depends on this class
+-//  if (_max_redefinition_flags <= Klass::ModifyClass) {
+-//    flush_dependent_code(the_class, THREAD);
+-//  }
+  mark_dependent_code(the_class);
+ 
+   _old_methods = the_class->methods();
+   _new_methods = new_class->methods();
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index 0066088b3b0..bd5e7d153be 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -142,7 +142,9 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   // and in all direct and indirect subclasses.
+   void increment_class_counter(InstanceKlass *ik, TRAPS);
+ 
+-  void flush_dependent_code(InstanceKlass* k_h, TRAPS);
+  void mark_dependent_code(InstanceKlass* ik);
+
+  void flush_dependent_code(TRAPS);
+ 
+   u8 next_id();
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0022-dcevm15-fix-ResolvedMethodTable.patch
+++ b/jb/project/tools/patches/dcevm/0022-dcevm15-fix-ResolvedMethodTable.patch
@@ -0,0 +1,211 @@
+From 4f88dcec830d39452f69d1117729469fdb768a8f Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 22 Nov 2020 12:05:26 +0100
+Subject: [PATCH 22/34] dcevm15 - fix ResolvedMethodTable
+
+---
+ src/hotspot/share/classfile/javaClasses.cpp   |   5 -
+ src/hotspot/share/classfile/javaClasses.hpp   |   1 -
+ .../share/prims/resolvedMethodTable.cpp       | 139 +++++++++++-------
+ 3 files changed, 84 insertions(+), 61 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/javaClasses.cpp b/src/hotspot/share/classfile/javaClasses.cpp
+index 9b086a241f7..9a627786d0f 100644
+--- a/src/hotspot/share/classfile/javaClasses.cpp
+++ b/src/hotspot/share/classfile/javaClasses.cpp
+@@ -3996,11 +3996,6 @@ void java_lang_invoke_ResolvedMethodName::set_vmholder(oop resolved_method, oop
+   resolved_method->obj_field_put(_vmholder_offset, holder);
+ }
+ 
+-void java_lang_invoke_ResolvedMethodName::set_vmholder_offset(oop resolved_method, Method* m) {
+-  assert(is_instance(resolved_method), "wrong type");
+-  resolved_method->obj_field_put(_vmholder_offset, m->method_holder()->java_mirror());
+-}
+-
+ oop java_lang_invoke_ResolvedMethodName::find_resolved_method(const methodHandle& m, TRAPS) {
+   const Method* method = m();
+ 
+diff --git a/src/hotspot/share/classfile/javaClasses.hpp b/src/hotspot/share/classfile/javaClasses.hpp
+index 9abf2e1d105..8f5993b7225 100644
+--- a/src/hotspot/share/classfile/javaClasses.hpp
+++ b/src/hotspot/share/classfile/javaClasses.hpp
+@@ -1107,7 +1107,6 @@ class java_lang_invoke_ResolvedMethodName : AllStatic {
+ 
+   static Method* vmtarget(oop resolved_method);
+   static void set_vmtarget(oop resolved_method, Method* method);
+-  static void set_vmholder_offset(oop resolved_method, Method* method);
+ 
+   static void set_vmholder(oop resolved_method, oop holder);
+ 
+diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
+index eb9fcda44f3..d0f1667b967 100644
+--- a/src/hotspot/share/prims/resolvedMethodTable.cpp
+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
+@@ -375,6 +375,67 @@ public:
+   }
+ };
+ 
+class AdjustMethodEntriesDcevm : public StackObj {
+  bool* _trace_name_printed;
+  GrowableArray<oop>* _oops_to_add;
+public:
+  AdjustMethodEntriesDcevm(GrowableArray<oop>* oops_to_add, bool* trace_name_printed) : _trace_name_printed(trace_name_printed), _oops_to_add(oops_to_add) {};
+  bool operator()(WeakHandle<vm_resolved_method_table_data>* entry) {
+    oop mem_name = entry->peek();
+    if (mem_name == NULL) {
+      // Removed
+      return true;
+    }
+
+    Method* old_method = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(mem_name);
+
+    if (old_method->is_old()) {
+
+      InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
+      Method* newer_method;
+
+      // Method* new_method;
+      if (old_method->is_deleted()) {
+        newer_method = Universe::throw_no_such_method_error();
+      } else {
+        newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
+
+        log_debug(redefine, class, update)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+
+        assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
+        assert(newer_method != NULL, "method_with_idnum() should not be NULL");
+        assert(old_method != newer_method, "sanity check");
+
+        Thread* thread = Thread::current();
+        ResolvedMethodTableLookup lookup(thread, method_hash(newer_method), newer_method);
+        ResolvedMethodGet rmg(thread, newer_method);
+
+        if (_local_table->get(thread, lookup, rmg)) {
+          // old method was already adjusted if new method exists in _the_table
+            return true;
+        }
+      }
+
+      java_lang_invoke_ResolvedMethodName::set_vmtarget(mem_name, newer_method);
+      java_lang_invoke_ResolvedMethodName::set_vmholder(mem_name, newer_method->method_holder()->java_mirror());
+
+      newer_klass->set_has_resolved_methods();
+      _oops_to_add->append(mem_name);
+
+      ResourceMark rm;
+      if (!(*_trace_name_printed)) {
+        log_debug(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
+         *_trace_name_printed = true;
+      }
+      log_debug(redefine, class, update, constantpool)
+        ("ResolvedMethod method update: %s(%s)",
+         newer_method->name()->as_C_string(), newer_method->signature()->as_C_string());
+    }
+
+    return true;
+  }
+};
+
+ // It is called at safepoint only for RedefineClasses
+ void ResolvedMethodTable::adjust_method_entries(bool * trace_name_printed) {
+   assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
+@@ -382,73 +443,41 @@ void ResolvedMethodTable::adjust_method_entries(bool * trace_name_printed) {
+   AdjustMethodEntries adjust(trace_name_printed);
+   _local_table->do_safepoint_scan(adjust);
+ }
+-#endif // INCLUDE_JVMTI
+ 
+-// (DCEVM) It is called at safepoint only for RedefineClasses
+// It is called at safepoint only for RedefineClasses
+ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed) {
+   assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
+   // For each entry in RMT, change to new method
+-  GrowableArray<oop>* oops_to_add = new GrowableArray<oop>();
+-
+-  for (int i = 0; i < _the_table->table_size(); ++i) {
+-    for (ResolvedMethodEntry* entry = _the_table->bucket(i);
+-         entry != NULL;
+-         entry = entry->next()) {
+-
+-      oop mem_name = entry->object_no_keepalive();
+-      // except ones removed
+-      if (mem_name == NULL) {
+-        continue;
+-      }
+-      Method* old_method = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(mem_name);
+-
+-      if (old_method->is_old()) {
+-
+-        InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
+-        Method* newer_method;
+-
+-        // Method* new_method;
+-        if (old_method->is_deleted()) {
+-          newer_method = Universe::throw_no_such_method_error();
+-        } else {
+-          newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
+-
+-          log_debug(redefine, class, update)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
+-
+-          assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
+-          assert(newer_method != NULL, "method_with_idnum() should not be NULL");
+-          assert(old_method != newer_method, "sanity check");
+-
+-          if (_the_table->lookup(newer_method) != NULL) {
+-            // old method was already adjusted if new method exists in _the_table
+-              continue;
+-          }
+-        }
+  GrowableArray<oop> oops_to_add(0);
+  AdjustMethodEntriesDcevm adjust(&oops_to_add, trace_name_printed);
+  _local_table->do_safepoint_scan(adjust);
+  Thread* thread = Thread::current();
+  for (int i = 0; i < oops_to_add.length(); i++) {
+    oop mem_name = oops_to_add.at(i);
+    Method* method = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(mem_name);
+ 
+-        java_lang_invoke_ResolvedMethodName::set_vmtarget(mem_name, newer_method);
+-        java_lang_invoke_ResolvedMethodName::set_vmholder_offset(mem_name, newer_method);
+    // The hash table takes ownership of the WeakHandle, even if it's not inserted.
+ 
+-        newer_klass->set_has_resolved_methods();
+-        oops_to_add->append(mem_name);
+    ResolvedMethodTableLookup lookup(thread, method_hash(method), method);
+    ResolvedMethodGet rmg(thread, method);
+ 
+-        ResourceMark rm;
+-        if (!(*trace_name_printed)) {
+-          log_debug(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
+-           *trace_name_printed = true;
+-        }
+-        log_debug(redefine, class, update, constantpool)
+-          ("ResolvedMethod method update: %s(%s)",
+-           newer_method->name()->as_C_string(), newer_method->signature()->as_C_string());
+    while (true) {
+      if (_local_table->get(thread, lookup, rmg)) {
+        break;
+      }
+      WeakHandle<vm_resolved_method_table_data> wh = WeakHandle<vm_resolved_method_table_data>::create(Handle(thread, mem_name));
+      // The hash table takes ownership of the WeakHandle, even if it's not inserted.
+      if (_local_table->insert(thread, lookup, wh)) {
+        log_insert(method);
+        wh.resolve();
+        break;
+       }
+-    }
+-    for (int i = 0; i < oops_to_add->length(); i++) {
+-        oop mem_name = oops_to_add->at(i);
+-        Method* method = (Method*)java_lang_invoke_ResolvedMethodName::vmtarget(mem_name);
+-        _the_table->basic_add(method, Handle(Thread::current(), mem_name));
+     }
+   }
+ }
+ 
+#endif // INCLUDE_JVMTI
+
+ // Verification
+ class VerifyResolvedMethod : StackObj {
+  public:
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0023-dcevm15-fix-Universe-root_oops_do.patch
+++ b/jb/project/tools/patches/dcevm/0023-dcevm15-fix-Universe-root_oops_do.patch
@@ -0,0 +1,88 @@
+From 5379e56465d3d3930ec7ea91b1c64db2cdf70170 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 22 Nov 2020 12:05:50 +0100
+Subject: [PATCH 23/34] dcevm15 - fix Universe::root_oops_do
+
+---
+ src/hotspot/share/memory/universe.cpp | 38 +++++++++------------------
+ 1 file changed, 12 insertions(+), 26 deletions(-)
+
+diff --git a/src/hotspot/share/memory/universe.cpp b/src/hotspot/share/memory/universe.cpp
+index f6e4253b5a5..8dad437bd51 100644
+--- a/src/hotspot/share/memory/universe.cpp
+++ b/src/hotspot/share/memory/universe.cpp
+@@ -39,6 +39,7 @@
+ #include "gc/shared/gcConfig.hpp"
+ #include "gc/shared/gcLogPrecious.hpp"
+ #include "gc/shared/gcTraceTime.inline.hpp"
+#include "gc/shared/weakProcessor.hpp"
+ #include "interpreter/interpreter.hpp"
+ #include "logging/log.hpp"
+ #include "logging/logStream.hpp"
+@@ -75,6 +76,7 @@
+ #include "runtime/thread.inline.hpp"
+ #include "runtime/timerTrace.hpp"
+ #include "runtime/vmOperations.hpp"
+#include "services/management.hpp"
+ #include "services/memoryService.hpp"
+ #include "utilities/align.hpp"
+ #include "utilities/copy.hpp"
+@@ -180,45 +182,29 @@ void Universe::basic_type_classes_do(KlassClosure *closure) {
+ 
+ // FIXME: (DCEVM) This method should iterate all pointers that are not within heap objects.
+ void Universe::root_oops_do(OopClosure *oopClosure) {
+-
+-  class AlwaysTrueClosure: public BoolObjectClosure {
+-  public:
+-    void do_object(oop p) { ShouldNotReachHere(); }
+-    bool do_object_b(oop p) { return true; }
+-  };
+-  AlwaysTrueClosure always_true;
+-
+   Universe::oops_do(oopClosure);
+ //  ReferenceProcessor::oops_do(oopClosure); (tw) check why no longer there
+   JNIHandles::oops_do(oopClosure);   // Global (strong) JNI handles
+   Threads::oops_do(oopClosure, NULL);
+   ObjectSynchronizer::oops_do(oopClosure);
+-  // TODO: review, flat profiler was removed in j10
+-  // FlatProfiler::oops_do(oopClosure);
+-  JvmtiExport::oops_do(oopClosure);
+  // (DCEVM) TODO: Check if this is correct?
+  Management::oops_do(oopClosure);
+  OopStorageSet::vm_global()->oops_do(oopClosure);
+  CLDToOopClosure cld_closure(oopClosure, ClassLoaderData::_claim_none);
+  ClassLoaderDataGraph::cld_do(&cld_closure);
+ 
+   // Now adjust pointers in remaining weak roots.  (All of which should
+   // have been cleared if they pointed to non-surviving objects.)
+   // Global (weak) JNI handles
+-  JNIHandles::weak_oops_do(&always_true, oopClosure);
+  WeakProcessor::oops_do(oopClosure);
+ 
+   CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
+   CodeCache::blobs_do(&blobClosure);
+-  StringTable::oops_do(oopClosure);
+  AOT_ONLY(AOTLoader::oops_do(oopClosure);)
+  // StringTable::oops_do was removed in j15
+  // StringTable::oops_do(oopClosure);
+ 
+-  // (DCEVM) TODO: Check if this is correct?
+-  //CodeCache::scavenge_root_nmethods_oops_do(oopClosure);
+-  //Management::oops_do(oopClosure);
+-  //ref_processor()->weak_oops_do(&oopClosure);
+-  //PSScavenge::reference_processor()->weak_oops_do(&oopClosure);
+-
+-#if INCLUDE_AOT
+-  if (UseAOT) {
+-    AOTLoader::oops_do(oopClosure);
+-  }
+-#endif
+-  // SO_AllClasses
+-  SystemDictionary::oops_do(oopClosure);
+  // PSScavenge::reference_processor()->weak_oops_do(oopClosure);
+ }
+ 
+ void Universe::oops_do(OopClosure* f) {
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0024-Cleanup-dcevm-comments.patch
+++ b/jb/project/tools/patches/dcevm/0024-Cleanup-dcevm-comments.patch
@@ -0,0 +1,67 @@
+From c6ea68e66d37d70739f7b0ee74131322b4526a68 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 22 Nov 2020 12:03:32 +0100
+Subject: [PATCH 24/34] Cleanup dcevm comments
+
+---
+ src/hotspot/share/classfile/classLoaderDataGraph.hpp     | 2 +-
+ src/hotspot/share/classfile/systemDictionary.hpp         | 2 +-
+ src/hotspot/share/gc/shared/gcConfig.cpp                 | 2 +-
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp | 2 +-
+ 4 files changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.hpp b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
+index f380aa3fa34..8ce94cccb47 100644
+--- a/src/hotspot/share/classfile/classLoaderDataGraph.hpp
+++ b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
+@@ -104,7 +104,7 @@ class ClassLoaderDataGraph : public AllStatic {
+ 
+   static void dictionary_classes_do(KlassClosure* klass_closure);
+ 
+-  // Enhanced class redefinition
+  // (DCEVM) Enhanced class redefinition
+   static void rollback_redefinition();
+ 
+   // VM_CounterDecay iteration support
+diff --git a/src/hotspot/share/classfile/systemDictionary.hpp b/src/hotspot/share/classfile/systemDictionary.hpp
+index 931e655d631..1019dbd0d04 100644
+--- a/src/hotspot/share/classfile/systemDictionary.hpp
+++ b/src/hotspot/share/classfile/systemDictionary.hpp
+@@ -455,7 +455,7 @@ public:
+   static bool is_well_known_klass(Symbol* class_name);
+ #endif
+ 
+-  // Enhanced class redefinition
+  // (DCEVM) Enhanced class redefinition
+   static void remove_from_hierarchy(InstanceKlass* k);
+   static void update_constraints_after_redefinition();
+ 
+diff --git a/src/hotspot/share/gc/shared/gcConfig.cpp b/src/hotspot/share/gc/shared/gcConfig.cpp
+index 5c1a09390f1..23fbf715378 100644
+--- a/src/hotspot/share/gc/shared/gcConfig.cpp
+++ b/src/hotspot/share/gc/shared/gcConfig.cpp
+@@ -99,7 +99,7 @@ void GCConfig::fail_if_non_included_gc_is_selected() {
+ 
+ void GCConfig::select_gc_ergonomically() {
+   if (AllowEnhancedClassRedefinition && !UseG1GC) {
+-    // Enhanced class redefinition only supports serial GC at the moment
+    // (DCEVM) Enhanced class redefinition only supports serial GC at the moment
+     FLAG_SET_ERGO(UseSerialGC, true);
+   } else if (os::is_server_class_machine()) {
+ #if INCLUDE_G1GC
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index bd5e7d153be..5de375fb888 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -78,7 +78,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   // have any entries.
+   bool _any_class_has_resolved_methods;
+ 
+-  // Enhanced class redefinition, affected klasses contain all classes which should be redefined
+  // (DCEVM) Enhanced class redefinition, affected klasses contain all classes which should be redefined
+   // either because of redefine, class hierarchy or interface change
+   GrowableArray<Klass*>*      _affected_klasses;
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0025-Fix-cpCache-in-not-AllowEnhancedClassRedefinition-mo.patch
+++ b/jb/project/tools/patches/dcevm/0025-Fix-cpCache-in-not-AllowEnhancedClassRedefinition-mo.patch
@@ -0,0 +1,43 @@
+From 507d97966c7145d0ae2533459cc504c7b0d6d5b6 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 22 Nov 2020 18:49:05 +0100
+Subject: [PATCH 25/34] Fix cpCache in not AllowEnhancedClassRedefinition mode
+
+---
+ src/hotspot/share/oops/cpCache.hpp | 8 +++++---
+ 1 file changed, 5 insertions(+), 3 deletions(-)
+
+diff --git a/src/hotspot/share/oops/cpCache.hpp b/src/hotspot/share/oops/cpCache.hpp
+index 121a13b1dda..64dcf6223f5 100644
+--- a/src/hotspot/share/oops/cpCache.hpp
+++ b/src/hotspot/share/oops/cpCache.hpp
+@@ -148,13 +148,13 @@ class ConstantPoolCacheEntry {
+   void set_bytecode_2(Bytecodes::Code code);
+   void set_f1(Metadata* f1) {
+     Metadata* existing_f1 = _f1; // read once
+-    //assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
+    assert(AllowEnhancedClassRedefinition || existing_f1 == NULL || existing_f1 == f1, "illegal field change");
+     _f1 = f1;
+   }
+   void release_set_f1(Metadata* f1);
+   void set_f2(intx f2) {
+     intx existing_f2 = _f2; // read once
+-    //assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change");
+    assert(AllowEnhancedClassRedefinition || existing_f2 == 0 || existing_f2 == f2, "illegal field change");
+     _f2 = f2;
+   }
+   void set_f2_as_vfinal_method(Method* f2) {
+@@ -215,7 +215,9 @@ class ConstantPoolCacheEntry {
+   void initialize_resolved_reference_index(int ref_index) {
+     assert(_f2 == 0, "set once");  // note: ref_index might be zero also
+     _f2 = ref_index;
+-    _flags = 1 << is_resolved_ref_shift;
+    if (AllowEnhancedClassRedefinition) {
+      _flags = 1 << is_resolved_ref_shift;
+    }
+   }
+ 
+   void set_field(                                // sets entry to resolved field state
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0026-dcevm15-add-ClassLoaderDataGraph_lock-on.patch
+++ b/jb/project/tools/patches/dcevm/0026-dcevm15-add-ClassLoaderDataGraph_lock-on.patch
@@ -0,0 +1,32 @@
+From b516b615c20fafa2094dfb9f4cb08245b26418d0 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 22 Nov 2020 19:51:46 +0100
+Subject: [PATCH 26/34] dcevm15 - add ClassLoaderDataGraph_lock on
+ ClassLoaderDataGraph::classes_do
+
+ClassLoaderDataGraph::classes_do need safepoint or lock,
+find_sorted_affected_classes is not in safepoint therefore it must be
+locked
+---
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index efaf11e1666..197e1c0029f 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -2063,7 +2063,10 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
+   AffectedKlassClosure closure(_affected_klasses);
+   // Updated in j10, from original SystemDictionary::classes_do
+ 
+-  ClassLoaderDataGraph::classes_do(&closure);
+  {
+    MutexLocker mcld(ClassLoaderDataGraph_lock);
+    ClassLoaderDataGraph::classes_do(&closure);
+  }
+   //ClassLoaderDataGraph::dictionary_classes_do(&closure);
+ 
+   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0027-dcevm15-check-if-has_nestmate_access_to-has-newest-h.patch
+++ b/jb/project/tools/patches/dcevm/0027-dcevm15-check-if-has_nestmate_access_to-has-newest-h.patch
@@ -0,0 +1,29 @@
+From c6498946006879314bdc6218ee72da5d9c88f237 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sat, 28 Nov 2020 19:29:42 +0100
+Subject: [PATCH 27/34] dcevm15 - check if has_nestmate_access_to has newest
+ host class
+
+---
+ src/hotspot/share/oops/instanceKlass.cpp | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
+index 5e40d78a87e..1d9623f2446 100644
+--- a/src/hotspot/share/oops/instanceKlass.cpp
+++ b/src/hotspot/share/oops/instanceKlass.cpp
+@@ -445,6 +445,11 @@ bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
+     return false;
+   }
+ 
+  if (AllowEnhancedClassRedefinition) {
+    // TODO: (DCEVM) check if it correct. It fix problems with lambdas (hidden)
+    cur_host = InstanceKlass::cast(cur_host->newest_version());
+  }
+
+   Klass* k_nest_host = k->nest_host(CHECK_false);
+   if (k_nest_host == NULL) {
+     return false;
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0028-Remove-unused-fieldType.patch
+++ b/jb/project/tools/patches/dcevm/0028-Remove-unused-fieldType.patch
@@ -0,0 +1,24 @@
+From 86c27155386c1c40642c99c63a242d1f5d8601a5 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sat, 28 Nov 2020 19:31:08 +0100
+Subject: [PATCH 28/34] Remove unused fieldType
+
+---
+ src/hotspot/share/classfile/vmSymbols.hpp | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/src/hotspot/share/classfile/vmSymbols.hpp b/src/hotspot/share/classfile/vmSymbols.hpp
+index 6a3b234b222..eb06684a288 100644
+--- a/src/hotspot/share/classfile/vmSymbols.hpp
+++ b/src/hotspot/share/classfile/vmSymbols.hpp
+@@ -465,7 +465,6 @@
+   template(static_offset_name,                        "staticOffset")                             \
+   template(static_base_name,                          "staticBase")                               \
+   template(field_offset_name,                         "fieldOffset")                              \
+-  template(field_type_name,                           "fieldType")                                \
+                                                                                                   \
+    /* name symbols needed by intrinsics */                                                         \
+                                                                                                   \
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0029-mark_as_scavengable-only-alive-methods.patch
+++ b/jb/project/tools/patches/dcevm/0029-mark_as_scavengable-only-alive-methods.patch
@@ -0,0 +1,54 @@
+From 025d0d2903963fb79f83cf0d90418783d3ef6813 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 29 Nov 2020 17:18:16 +0100
+Subject: [PATCH 29/34] mark_as_scavengable only alive methods
+
+---
+ .../share/prims/jvmtiEnhancedRedefineClasses.cpp   | 14 ++++++++------
+ 1 file changed, 8 insertions(+), 6 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 197e1c0029f..e00fac1f693 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -223,19 +223,21 @@ class FieldCopier : public FieldClosure {
+ 
+ // TODO: review...
+ void VM_EnhancedRedefineClasses::mark_as_scavengable(nmethod* nm) {
+-  ScavengableNMethods::register_nmethod(nm);
+  if (nm->is_alive()) {
+    ScavengableNMethods::register_nmethod(nm);
+  }
+ }
+ 
+ void VM_EnhancedRedefineClasses::unregister_nmethod_g1(nmethod* nm) {
+   // It should work not only for G1 but also for another GCs, but this way is safer now
+-  if (!nm->is_zombie() && !nm->is_unloaded()) {
+  if (nm->is_alive()) {
+     Universe::heap()->unregister_nmethod(nm);
+   }
+ }
+ 
+ void VM_EnhancedRedefineClasses::register_nmethod_g1(nmethod* nm) {
+   // It should work not only for G1 but also for another GCs, but this way is safer now
+-  if (!nm->is_zombie() && !nm->is_unloaded()) {
+  if (nm->is_alive()) {
+     Universe::heap()->register_nmethod(nm);
+   }
+ }
+@@ -511,9 +513,9 @@ void VM_EnhancedRedefineClasses::doit() {
+     flush_dependent_code(thread);
+   // }
+ 
+-    // Adjust constantpool caches for all classes that reference methods of the evolved class.
+-    ClearCpoolCacheAndUnpatch clear_cpool_cache(thread);
+-    ClassLoaderDataGraph::classes_do(&clear_cpool_cache);
+  // Adjust constantpool caches for all classes that reference methods of the evolved class.
+  ClearCpoolCacheAndUnpatch clear_cpool_cache(thread);
+  ClassLoaderDataGraph::classes_do(&clear_cpool_cache);
+ 
+   // JSR-292 support
+   if (_any_class_has_resolved_methods) {
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0030-dcevm15-lock-on-ClassLoaderDataGraph-rollback_redefi.patch
+++ b/jb/project/tools/patches/dcevm/0030-dcevm15-lock-on-ClassLoaderDataGraph-rollback_redefi.patch
@@ -0,0 +1,28 @@
+From 27aabfefe7d799545049bb81ba19d4ed2ff6379c Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 29 Nov 2020 17:20:11 +0100
+Subject: [PATCH 30/34] dcevm15 - lock on
+ ClassLoaderDataGraph::rollback_redefinition
+
+rollback is not in safepoint, therefore must be locked
+---
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index e00fac1f693..db5fb1c472b 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -1382,7 +1382,9 @@ void VM_EnhancedRedefineClasses::calculate_instance_update_information(Klass* ne
+ // Rollback all changes - clear new classes from the system dictionary, return old classes to directory, free memory.
+ void VM_EnhancedRedefineClasses::rollback() {
+   log_info(redefine, class, load)("Rolling back redefinition, result=%d", _res);
+  ClassLoaderDataGraph_lock->lock();
+   ClassLoaderDataGraph::rollback_redefinition();
+  ClassLoaderDataGraph_lock->unlock();
+ 
+   for (int i = 0; i < _new_classes->length(); i++) {
+     SystemDictionary::remove_from_hierarchy(_new_classes->at(i));
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0031-ResourceMark-in-G1IterateObjectClosureTask-fixing-me.patch
+++ b/jb/project/tools/patches/dcevm/0031-ResourceMark-in-G1IterateObjectClosureTask-fixing-me.patch
@@ -0,0 +1,28 @@
+From 9b405cb642d5935c39c8dbd522ea2fdecfc29ef3 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 29 Nov 2020 19:59:50 +0100
+Subject: [PATCH 31/34] ResourceMark in G1IterateObjectClosureTask fixing
+ memory leaks
+
+G1IterateObjectClosureTask is used only in redefinition full GC run
+---
+ src/hotspot/share/gc/g1/g1CollectedHeap.cpp | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
+index a29d2dddc2d..2af6df6c1e4 100644
+--- a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
+@@ -2362,6 +2362,9 @@ class G1IterateObjectClosureTask : public AbstractGangTask {
+     _cl(cl), _g1h(g1h),  _hrclaimer(g1h->workers()->active_workers()) { }
+ 
+   virtual void work(uint worker_id) {
+    Thread *thread = Thread::current();
+    HandleMark hm(thread);   // make sure any handles created are deleted
+    ResourceMark rm(thread);
+     IterateObjectClosureRegionClosure blk(_cl);
+     _g1h->heap_region_par_iterate_from_worker_offset(&blk, &_hrclaimer, worker_id);
+   }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0032-dcevm15-fix-hidded-classes.patch
+++ b/jb/project/tools/patches/dcevm/0032-dcevm15-fix-hidded-classes.patch
@@ -0,0 +1,91 @@
+From 40fe40884d4efc50864bb3f2dd88f0a2e7122d5a Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 29 Nov 2020 20:05:03 +0100
+Subject: [PATCH 32/34] dcevm15 - fix hidded classes
+
+---
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 41 ++++++++++++++-----
+ 1 file changed, 30 insertions(+), 11 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index db5fb1c472b..590f7fdfafe 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -722,7 +722,8 @@ bool VM_EnhancedRedefineClasses::is_modifiable_class(oop klass_mirror) {
+   }
+ 
+   // Cannot redefine or retransform an anonymous class.
+-  if (InstanceKlass::cast(k)->is_unsafe_anonymous()) {
+  // TODO: check if is correct in j15
+  if (InstanceKlass::cast(k)->is_unsafe_anonymous() || InstanceKlass::cast(k)->is_hidden()) {
+     return false;
+   }
+   return true;
+@@ -808,21 +809,27 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
+ 
+     InstanceKlass* k;
+ 
+-    if (InstanceKlass::cast(the_class)->is_unsafe_anonymous()) {
+-      const InstanceKlass* host_class = the_class->unsafe_anonymous_host();
+    if (the_class->is_unsafe_anonymous() || the_class->is_hidden()) {
+      InstanceKlass* dynamic_host_class = NULL;
+      InstanceKlass* unsafe_anonymous_host = NULL;
+ 
+-      // Make sure it's the real host class, not another anonymous class.
+-      while (host_class != NULL && host_class->is_unsafe_anonymous()) {
+-        host_class = host_class->unsafe_anonymous_host();
+      if (the_class->is_hidden()) {
+        log_debug(redefine, class, load)("loading hidden class %s", the_class->name()->as_C_string());
+        dynamic_host_class = the_class->nest_host(THREAD);
+      }
+
+      if (the_class->is_unsafe_anonymous()) {
+        log_debug(redefine, class, load)("loading usafe anonymous %s", the_class->name()->as_C_string());
+        unsafe_anonymous_host = the_class->unsafe_anonymous_host();
+       }
+ 
+       ClassLoadInfo cl_info(protection_domain,
+-                            host_class,
+-                            NULL,     // dynamic_nest_host
+                            unsafe_anonymous_host,
+                             NULL,     // cp_patches
+                            dynamic_host_class,     // dynamic_nest_host
+                             Handle(), // classData
+-                            false,    // is_hidden
+-                            false,    // is_strong_hidden
+                            the_class->is_hidden(),    // is_hidden
+                            !the_class->is_non_strong_hidden(),    // is_strong_hidden
+                             true);    // FIXME: check if correct. can_access_vm_annotations
+ 
+       k = SystemDictionary::parse_stream(the_class_sym,
+@@ -833,7 +840,17 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
+                                          THREAD);
+ 
+       k->class_loader_data()->exchange_holders(the_class->class_loader_data());
+-      the_class->class_loader_data()->inc_keep_alive();
+
+      if (the_class->is_hidden()) {
+      // from jvm_lookup_define_class() (jvm.cpp):
+      // The hidden class loader data has been artificially been kept alive to
+      // this point. The mirror and any instances of this class have to keep
+      // it alive afterwards.
+        the_class->class_loader_data()->dec_keep_alive();
+      } else {
+        the_class->class_loader_data()->inc_keep_alive();
+      }
+
+     } else {
+       k = SystemDictionary::resolve_from_stream(the_class_sym,
+                                                   the_class_loader,
+@@ -1475,6 +1492,8 @@ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
+     ik->set_unsafe_anonymous_host(InstanceKlass::cast(ik->unsafe_anonymous_host()->newest_version()));
+   }
+ 
+  // FIXME: check new nest_host for hidden
+
+   // Update implementor if there is only one, in this case implementor() can reference old class
+   if (ik->is_interface()) {
+     Klass* implKlass = ik->implementor();
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0033-dcevm15-DON-T-clear-F2-in-CP-cache-after-indy-unevol.patch
+++ b/jb/project/tools/patches/dcevm/0033-dcevm15-DON-T-clear-F2-in-CP-cache-after-indy-unevol.patch
@@ -0,0 +1,27 @@
+From 29920b076b4ad96d85adbce0a1d947e5022ba3ad Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 29 Nov 2020 20:08:57 +0100
+Subject: [PATCH 33/34] dcevm15 - DON'T clear F2 in CP cache after indy
+ unevolving
+
+It's not clear why it was cleared in dcevm7-11
+---
+ src/hotspot/share/oops/cpCache.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/oops/cpCache.cpp b/src/hotspot/share/oops/cpCache.cpp
+index 79a38dbeff0..650e6fab42d 100644
+--- a/src/hotspot/share/oops/cpCache.cpp
+++ b/src/hotspot/share/oops/cpCache.cpp
+@@ -650,7 +650,7 @@ void ConstantPoolCacheEntry::clear_entry() {
+ 
+   if (clearData) {
+     if (!is_resolved_reference()) {
+-      _f2 = 0;
+      // _f2 = 0;
+     }
+     // FIXME: (DCEVM) we want to clear flags, but parameter size is actually used
+     // after we return from the method, before entry is re-initialized. So let's
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0034-dcevm15-fix-Universe-root_oops_do.patch
+++ b/jb/project/tools/patches/dcevm/0034-dcevm15-fix-Universe-root_oops_do.patch
@@ -0,0 +1,49 @@
+From 1f13b20ab5553182680045b7d7324ff92da7e7f0 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 29 Nov 2020 21:28:06 +0100
+Subject: [PATCH 34/34] dcevm15 - fix Universe::root_oops_do
+
+Removed ClassLoaderDataGraph::cld_do was cause of crashes due multiple
+oop patching. ClassLoaderDataGraph::cld_do replaced in dcevm15
+previously used and removed SystemDictionary:oops_do
+---
+ src/hotspot/share/memory/universe.cpp | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+diff --git a/src/hotspot/share/memory/universe.cpp b/src/hotspot/share/memory/universe.cpp
+index 8dad437bd51..0199962a684 100644
+--- a/src/hotspot/share/memory/universe.cpp
+++ b/src/hotspot/share/memory/universe.cpp
+@@ -190,21 +190,26 @@ void Universe::root_oops_do(OopClosure *oopClosure) {
+   // (DCEVM) TODO: Check if this is correct?
+   Management::oops_do(oopClosure);
+   OopStorageSet::vm_global()->oops_do(oopClosure);
+-  CLDToOopClosure cld_closure(oopClosure, ClassLoaderData::_claim_none);
+-  ClassLoaderDataGraph::cld_do(&cld_closure);
+  // CLDToOopClosure cld_closure(oopClosure, ClassLoaderData::_claim_none);
+  // ClassLoaderDataGraph::cld_do(&cld_closure);
+ 
+   // Now adjust pointers in remaining weak roots.  (All of which should
+   // have been cleared if they pointed to non-surviving objects.)
+   // Global (weak) JNI handles
+   WeakProcessor::oops_do(oopClosure);
+ 
+  JvmtiExport::oops_do(oopClosure);
+
+   CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
+   CodeCache::blobs_do(&blobClosure);
+  
+   AOT_ONLY(AOTLoader::oops_do(oopClosure);)
+  
+   // StringTable::oops_do was removed in j15
+   // StringTable::oops_do(oopClosure);
+ 
+-  // PSScavenge::reference_processor()->weak_oops_do(oopClosure);
+  // OopStorageSet::vm_global()->oops_do(oopClosure);
+
+ }
+ 
+ void Universe::oops_do(OopClosure* f) {
+-- 
+2.23.0
+
--- a/jb/project/tools/windows/scripts/mkimages_x64.sh
+++ b/jb/project/tools/windows/scripts/mkimages_x64.sh
@@ -0,0 +1,119 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies major version of OpenJDK e.g. 11_0_6 (instead of dots '.' underbars "_" are used)
+#   JDK_BUILD_NUMBER - specifies update release of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#   bundle_type      - specifies bundle to be built; possible values:
+#                        <empty> or nomod - the release bundles without any additional modules (jcef)
+#                        jcef - the release bundles with jcef
+#                        fd - the fastdebug bundles which also include the jcef module
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+# Environment variables:
+#   JCEF_PATH - specifies the path to the directory with JCEF binaries.
+#               By default JCEF binaries should be located in ./jcef_win_x64
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+bundle_type=$4
+JBSDK_VERSION_WITH_DOTS=$(echo $JBSDK_VERSION | sed 's/_/\./g')
+WORK_DIR=$(pwd)
+JCEF_PATH=${JCEF_PATH:=$WORK_DIR/jcef_win_x64}
+
+source jb/project/tools/common/scripts/common.sh
+
+function create_image_bundle {
+  __bundle_name=$1
+  __modules_path=$2
+  __modules=$3
+
+  [ -d $__bundle_name ] && rm -rf $__bundle_name
+
+  echo Running jlink ...
+  ${JSDK}/bin/jlink \
+    --module-path $__modules_path --no-man-pages --compress=2 \
+    --add-modules $__modules --output $__bundle_name || do_exit $?
+
+  grep -v "^JAVA_VERSION" "$JSDK"/release | grep -v "^MODULES" >> $__bundle_name/release
+  if [ "$__bundle_name" == "$JBRSDK_BUNDLE" ]; then
+    sed 's/JBR/JBRSDK/g' $__bundle_name/release > release
+    mv release $__bundle_name/release
+  fi
+}
+
+WITH_DEBUG_LEVEL="--with-debug-level=release"
+RELEASE_NAME=windows-x86_64-server-release
+
+case "$bundle_type" in
+  "jcef")
+    do_reset_changes=1
+    ;;
+  "dcevm")
+    HEAD_REVISION=$(git rev-parse HEAD)
+    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
+    do_reset_dcevm=1
+    do_reset_changes=1
+    ;;
+  "nomod" | "")
+    bundle_type=""
+    ;;
+  "fd")
+    do_reset_changes=1
+    WITH_DEBUG_LEVEL="--with-debug-level=fastdebug"
+    RELEASE_NAME=windows-x86_64-server-fastdebug
+    ;;
+esac
+
+sh ./configure \
+  --disable-warnings-as-errors \
+  $WITH_DEBUG_LEVEL \
+  --with-vendor-name="$VENDOR_NAME" \
+  --with-vendor-version-string="$VENDOR_VERSION_STRING" \
+  --with-version-pre= \
+  --with-version-build=$JDK_BUILD_NUMBER \
+  --with-version-opt=b${build_number} \
+  --with-toolchain-version=$TOOLCHAIN_VERSION \
+  --with-boot-jdk=$BOOT_JDK \
+  --disable-ccache \
+  --enable-cds=yes || do_exit $?
+
+if [ -z "$bundle_type" ]; then
+  make LOG=info CONF=$RELEASE_NAME clean images test-image || do_exit $?
+else
+  make LOG=info CONF=$RELEASE_NAME clean images || do_exit $?
+fi
+
+IMAGES_DIR=build/$RELEASE_NAME/images
+JSDK=$IMAGES_DIR/jdk
+JSDK_MODS_DIR=$IMAGES_DIR/jmods
+JBRSDK_BUNDLE=jbrsdk
+
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+  git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
+  update_jsdk_mods "$JSDK" "$JCEF_PATH"/jmods "$JSDK"/jmods "$JSDK_MODS_DIR" || do_exit $?
+  cp $JCEF_PATH/jmods/* ${JSDK_MODS_DIR} # $JSDK/jmods is not unchanged
+
+  jbr_name_postfix="_${bundle_type}"
+fi
+
+# create runtime image bundle
+modules=$(xargs < modules.list | sed s/" "//g) || do_exit $?
+create_image_bundle "jbr${jbr_name_postfix}" $JSDK_MODS_DIR "$modules" || do_exit $?
+
+# create sdk image bundle
+modules=$(cat ${JSDK}/release | grep MODULES | sed s/MODULES=//g | sed s/' '/,/g | sed s/\"//g | sed s/\\r//g | sed s/\\n//g)
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
+  modules=${modules},$(get_mods_list "$JCEF_PATH"/jmods)
+fi
+create_image_bundle "$JBRSDK_BUNDLE" "$JSDK_MODS_DIR" "$modules" || do_exit $?
+
+do_exit 0
--- a/jb/project/tools/windows/scripts/mkimages_x86.sh
+++ b/jb/project/tools/windows/scripts/mkimages_x86.sh
@@ -0,0 +1,63 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies the current version of OpenJDK e.g. 11_0_6
+#   JDK_BUILD_NUMBER - specifies the number of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+
+JBSDK_VERSION_WITH_DOTS=$(echo $JBSDK_VERSION | sed 's/_/\./g')
+
+source jb/project/tools/common/scripts/common.sh
+
+JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}
+WORK_DIR=$(pwd)
+
+[ -z "$bundle_type" ] && (git apply -p0 < jb/project/tools/patches/exclude_jcef_module.patch || exit $?)
+
+PATH="/usr/local/bin:/usr/bin:${PATH}"
+./configure \
+  --disable-warnings-as-errors \
+  --with-target-bits=32 \
+  --with-vendor-name="${VENDOR_NAME}" \
+  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+  --with-version-pre= \
+  --with-version-build=${JDK_BUILD_NUMBER} \
+  --with-version-opt=b${build_number} \
+  --with-toolchain-version=${TOOLCHAIN_VERSION} \
+  --with-boot-jdk=${BOOT_JDK} \
+  --disable-ccache \
+  --enable-cds=yes || exit 1
+make clean CONF=windows-x86-server-release || exit 1
+make LOG=info images CONF=windows-x86-server-release test-image || exit 1
+
+JBSDK=${JBRSDK_BASE_NAME}-windows-x86-b${build_number}
+BASE_DIR=build/windows-x86-server-release/images
+JSDK=${BASE_DIR}/jdk
+JBRSDK_BUNDLE=jbrsdk
+
+rm -rf ${BASE_DIR}/${JBRSDK_BUNDLE} && rsync -a --exclude demo --exclude sample ${JSDK}/ ${JBRSDK_BUNDLE} || exit 1
+sed 's/JBR/JBRSDK/g' ${JSDK}/release > release
+mv release ${JBRSDK_BUNDLE}/release
+
+JBR_BUNDLE=jbr
+rm -rf ${JBR_BUNDLE}
+grep -v javafx modules.list | grep -v "jdk.internal.vm\|jdk.aot\|jcef" > modules.list.x86
+${JSDK}/bin/jlink \
+  --module-path ${JSDK}/jmods --no-man-pages --compress=2 \
+  --add-modules $(xargs < modules.list.x86 | sed s/" "//g) --output ${JBR_BUNDLE} || exit $?
+
+echo Modifying release info ...
+#grep -v \"^JAVA_VERSION\" ${JSDK}/release | grep -v \"^MODULES\" >> ${JBR_BUNDLE}/release
--- a/jb/project/tools/windows/scripts/pack_x64.sh
+++ b/jb/project/tools/windows/scripts/pack_x64.sh
@@ -0,0 +1,77 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies major version of OpenJDK e.g. 11_0_6 (instead of dots '.' underbars "_" are used)
+#   JDK_BUILD_NUMBER - specifies udate release of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#   bundle_type      - specifies bundle to be built; possible values:
+#                        <empty> or nomod - the bundles without any additional modules (jcef)
+#                        jcef - the bundles with jcef
+#                        fd - the fastdebug bundles which also include the jcef module
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+
+source jb/project/tools/common/scripts/common.sh
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+bundle_type=$4
+
+function pack_jbr {
+
+  if [ -z "${bundle_type}" ]; then
+    JBR_BUNDLE=jbr
+  else
+    JBR_BUNDLE=jbr_${bundle_type}
+    [ -d ${BASE_DIR}/jbr ] && rm -rf ${BASE_DIR}/jbr
+    cp -R ${BASE_DIR}/${JBR_BUNDLE} ${BASE_DIR}/jbr
+  fi
+  JBR_BASE_NAME=${JBR_BUNDLE}-${JBSDK_VERSION}
+
+  JBR=$JBR_BASE_NAME-windows-x64-b$build_number
+  echo Creating $JBR.tar.gz ...
+
+  /usr/bin/tar -czf $JBR.tar.gz -C $BASE_DIR jbr || do_exit $?
+}
+
+JBRSDK_BASE_NAME=jbrsdk-$JBSDK_VERSION
+JBR_BASE_NAME=jbr-$JBSDK_VERSION
+RELEASE_NAME=windows-x86_64-server-release
+JBSDK=${JBRSDK_BASE_NAME}-osx-x64-b${build_number}
+case "$bundle_type" in
+  "nomod" | "")
+    bundle_type=""
+    ;;
+  "fd")
+    RELEASE_NAME=macosx-x86_64-server-fastdebug
+    JBSDK=${JBRSDK_BASE_NAME}-osx-x64-fastdebug-b${build_number}
+    ;;
+esac
+
+IMAGES_DIR=build/$RELEASE_NAME/images
+JSDK=$IMAGES_DIR/jdk
+JBSDK=$JBRSDK_BASE_NAME-windows-x64-b$build_number
+BASE_DIR=.
+
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+  JBRSDK_BUNDLE=jbrsdk
+  echo Creating $JBSDK.tar.gz ...
+  [ -f "$JBSDK.tar.gz" ] && rm "$JBSDK.tar.gz"
+  /usr/bin/tar -czf $JBSDK.tar.gz $JBRSDK_BUNDLE || do_exit $?
+fi
+
+pack_jbr $bundle_type
+
+if [ -z "$bundle_type" ]; then
+  JBRSDK_TEST=$JBRSDK_BASE_NAME-windows-test-x64-b$build_number
+  echo Creating $JBRSDK_TEST.tar.gz ...
+  /usr/bin/tar -czf $JBRSDK_TEST.tar.gz -C $IMAGES_DIR --exclude='test/jdk/demos' test || do_exit $?
+fi
--- a/jb/project/tools/windows/scripts/pack_x86.sh
+++ b/jb/project/tools/windows/scripts/pack_x86.sh
@@ -0,0 +1,42 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies the current version of OpenJDK e.g. 11_0_6
+#   JDK_BUILD_NUMBER - specifies the number of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#
+# jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
+#
+# $ ./java --version
+# openjdk 11.0.6 2020-01-14
+# OpenJDK Runtime Environment (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number})
+# OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
+#
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+
+JBRSDK_BASE_NAME=jbrsdk-$JBSDK_VERSION
+JBR_BASE_NAME=jbr-$JBSDK_VERSION
+
+IMAGES_DIR=build/windows-x86-server-release/images
+JSDK=$IMAGES_DIR/jdk
+JBSDK=$JBRSDK_BASE_NAME-windows-x86-b$build_number
+BASE_DIR=.
+
+JBRSDK_BUNDLE=jbrsdk
+echo Creating $JBSDK.tar.gz ...
+/usr/bin/tar -czf $JBSDK.tar.gz $JBRSDK_BUNDLE || exit 1
+
+JBR_BUNDLE=jbr
+JBR_BASE_NAME=jbr-${JBSDK_VERSION}
+
+JBR=$JBR_BASE_NAME-windows-x86-b$build_number
+echo Creating $JBR.tar.gz ...
+/usr/bin/tar -czf $JBR.tar.gz -C $BASE_DIR ${JBR_BUNDLE} || exit 1
+
+JBRSDK_TEST=$JBRSDK_BASE_NAME-windows-test-x86-b$build_number
+echo Creating $JBRSDK_TEST.tar.gz ...
+/usr/bin/tar -czf $JBRSDK_TEST.tar.gz -C $IMAGES_DIR --exclude='test/jdk/demos' test || exit 1
--- a/make/Bundles.gmk
+++ b/make/Bundles.gmk
@@ -410,17 +410,43 @@ endif

 ################################################################################

-ifneq ($(filter docs-bundles, $(MAKECMDGOALS)), )
-  DOCS_BUNDLE_FILES := $(call FindFiles, $(DOCS_IMAGE_DIR))
+ifneq ($(filter docs-jdk-bundles, $(MAKECMDGOALS)), )
+  DOCS_JDK_BUNDLE_FILES := $(call FindFiles, $(DOCS_JDK_IMAGE_DIR))

-  $(eval $(call SetupBundleFile, BUILD_DOCS_BUNDLE, \
-      BUNDLE_NAME := $(DOCS_BUNDLE_NAME), \
-      FILES := $(DOCS_BUNDLE_FILES), \
-      BASE_DIRS := $(DOCS_IMAGE_DIR), \
+  $(eval $(call SetupBundleFile, BUILD_DOCS_JDK_BUNDLE, \
+      BUNDLE_NAME := $(DOCS_JDK_BUNDLE_NAME), \
+      FILES := $(DOCS_JDK_BUNDLE_FILES), \
+      BASE_DIRS := $(DOCS_JDK_IMAGE_DIR), \
      SUBDIR := docs, \
  ))

-  DOCS_TARGETS += $(BUILD_DOCS_BUNDLE)
+  DOCS_JDK_TARGETS += $(BUILD_DOCS_JDK_BUNDLE)
+endif
+
+ifneq ($(filter docs-javase-bundles, $(MAKECMDGOALS)), )
+  DOCS_JAVASE_BUNDLE_FILES := $(call FindFiles, $(DOCS_JAVASE_IMAGE_DIR))
+
+  $(eval $(call SetupBundleFile, BUILD_DOCS_JAVASE_BUNDLE, \
+      BUNDLE_NAME := $(DOCS_JAVASE_BUNDLE_NAME), \
+      FILES := $(DOCS_JAVASE_BUNDLE_FILES), \
+      BASE_DIRS := $(DOCS_JAVASE_IMAGE_DIR), \
+      SUBDIR := docs-javase, \
+  ))
+
+  DOCS_JAVASE_TARGETS += $(BUILD_DOCS_JAVASE_BUNDLE)
+endif
+
+ifneq ($(filter docs-reference-bundles, $(MAKECMDGOALS)), )
+  DOCS_REFERENCE_BUNDLE_FILES := $(call FindFiles, $(DOCS_REFERENCE_IMAGE_DIR))
+
+  $(eval $(call SetupBundleFile, BUILD_DOCS_REFERENCE_BUNDLE, \
+      BUNDLE_NAME := $(DOCS_REFERENCE_BUNDLE_NAME), \
+      FILES := $(DOCS_REFERENCE_BUNDLE_FILES), \
+      BASE_DIRS := $(DOCS_REFERENCE_IMAGE_DIR), \
+      SUBDIR := docs-reference, \
+  ))
+
+  DOCS_REFERENCE_TARGETS += $(BUILD_DOCS_REFERENCE_BUNDLE)
 endif

 ################################################################################
@@ -469,9 +495,12 @@ $(eval $(call IncludeCustomExtension, Bundles.gmk))
 product-bundles: $(PRODUCT_TARGETS)
 legacy-bundles: $(LEGACY_TARGETS)
 test-bundles: $(TEST_TARGETS)
-docs-bundles: $(DOCS_TARGETS)
+docs-jdk-bundles: $(DOCS_JDK_TARGETS)
+docs-javase-bundles: $(DOCS_JAVASE_TARGETS)
+docs-reference-bundles: $(DOCS_REFERENCE_TARGETS)
 static-libs-bundles: $(STATIC_LIBS_TARGETS)
 jcov-bundles: $(JCOV_TARGETS)

-.PHONY: all default product-bundles test-bundles docs-bundles \
+.PHONY: all default product-bundles test-bundles \
+    docs-jdk-bundles docs-javase-bundles docs-reference-bundles \
    static-libs-bundles jcov-bundles
--- a/make/CompileCommands.gmk
+++ b/make/CompileCommands.gmk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -45,11 +45,6 @@ $(OUTPUTDIR)/compile_commands.json: $(wildcard $(MAKESUPPORT_OUTPUTDIR)/compile-
 	$(RM) $@
 	$(FIND) $(MAKESUPPORT_OUTPUTDIR)/compile-commands/ -name \*.json | \
 	    $(SORT) | $(XARGS) $(CAT) >> $@.tmp
-	$(if $(FIXPATH),$(FIXPATH) $(AWK) 'BEGIN { \
-	    tmpfile = substr(ARGV[2],2); \
-	    cmd = "$(CP) " "\047" tmpfile "\047" " $@.tmp"; \
-	    system(cmd); \
-	}' -- @$@.tmp)
 	$(SED) -e '1s/^/[\$(NEWLINE)/' -e '$(DOLLAR)s/,\s\{0,\}$(DOLLAR)/\$(NEWLINE)]/' $@.tmp > $@
 	$(RM) $@.tmp

--- a/make/CompileInterimLangtools.gmk
+++ b/make/CompileInterimLangtools.gmk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -49,8 +49,8 @@ TARGETS += $(patsubst %, $(BUILDTOOLS_OUTPUTDIR)/gensrc/%/module-info.java, \
    $(INTERIM_LANGTOOLS_MODULES))

 $(eval $(call SetupCopyFiles, COPY_PREVIEW_FEATURES, \
-    FILES := $(TOPDIR)/src/java.base/share/classes/jdk/internal/PreviewFeature.java, \
-    DEST := $(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim/jdk/internal/, \
+    FILES := $(TOPDIR)/src/java.base/share/classes/jdk/internal/javac/PreviewFeature.java, \
+    DEST := $(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim/jdk/internal/javac/, \
 ))

 TARGETS += $(COPY_PREVIEW_FEATURES)
@@ -74,15 +74,15 @@ define SetupInterimModule
      EXCLUDE_FILES := $(TOPDIR)/src/$1/share/classes/module-info.java \
          Standard.java, \
      EXTRA_FILES := $(BUILDTOOLS_OUTPUTDIR)/gensrc/$1.interim/module-info.java, \
-      COPY := .gif .png .xml .css .js javax.tools.JavaCompilerTool, \
+      COPY := .gif .png .xml .css .js .js.template .txt javax.tools.JavaCompilerTool, \
      BIN := $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules/$1.interim, \
      DISABLED_WARNINGS := module options, \
      JAVAC_FLAGS := \
          --module-path $(BUILDTOOLS_OUTPUTDIR)/interim_langtools_modules \
          $$(INTERIM_LANGTOOLS_ADD_EXPORTS) \
          --patch-module java.base=$(BUILDTOOLS_OUTPUTDIR)/gensrc/java.base.interim \
-          --add-exports java.base/jdk.internal=java.compiler.interim \
-          --add-exports java.base/jdk.internal=jdk.compiler.interim, \
+          --add-exports java.base/jdk.internal.javac=java.compiler.interim \
+          --add-exports java.base/jdk.internal.javac=jdk.compiler.interim, \
  ))

  $1_DEPS_INTERIM := $$(addsuffix .interim, $$(filter \
--- a/make/CompileJavaModules.gmk
+++ b/make/CompileJavaModules.gmk
@@ -31,521 +31,6 @@ include MakeBase.gmk
 include Modules.gmk
 include JavaCompilation.gmk

-# Hook to include the corresponding custom file, if present.
-$(eval $(call IncludeCustomExtension, CompileJavaModules.gmk))
-
-################################################################################
-# Module specific build settings
-
-java.base_DOCLINT += -Xdoclint:all/protected,-reference,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-java.base_JAVAC_FLAGS += -XDstringConcat=inline
-java.base_COPY += .icu .dat .spp .nrm content-types.properties \
-    hijrah-config-Hijrah-umalqura_islamic-umalqura.properties
-java.base_CLEAN += intrinsic.properties
-
-java.base_EXCLUDE_FILES += \
-  $(TOPDIR)/src/java.base/share/classes/jdk/internal/module/ModuleLoaderMap.java
-
-java.base_EXCLUDES += java/lang/doc-files
-
-# Exclude BreakIterator classes that are just used in compile process to generate
-# data files and shouldn't go in the product
-java.base_EXCLUDE_FILES += sun/text/resources/BreakIteratorRules.java
-
-ifeq ($(call isTargetOs, macosx aix), false)
-  java.base_EXCLUDE_FILES += sun/nio/fs/PollingWatchService.java
-endif
-
-ifeq ($(call isTargetOs, windows), true)
-  java.base_EXCLUDE_FILES += \
-      sun/nio/ch/SimpleAsynchronousFileChannelImpl.java \
-      #
-endif
-
-################################################################################
-
-java.compiler_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.datatransfer_DOCLINT += -Xdoclint:all/protected,-reference \
-    '-Xdoclint/package:java.*,javax.*'
-java.datatransfer_COPY += flavormap.properties
-
-################################################################################
-
-java.desktop_DISABLED_WARNINGS += missing-explicit-ctor
-java.desktop_DOCLINT += -Xdoclint:all/protected,-reference \
-    '-Xdoclint/package:java.*,javax.*'
-java.desktop_COPY += .gif .png .wav .txt .xml .css .pf
-java.desktop_CLEAN += iio-plugin.properties cursors.properties
-
-java.desktop_EXCLUDES += \
-    java/awt/doc-files \
-    javax/swing/doc-files \
-    javax/swing/text/doc-files \
-    javax/swing/plaf/synth/doc-files \
-    javax/swing/undo/doc-files \
-    sun/awt/X11/doc-files \
-    #
-
-java.desktop_EXCLUDE_FILES += \
-    javax/swing/plaf/nimbus/InternalFrameTitlePanePainter.java \
-    javax/swing/plaf/nimbus/OptionPaneMessageAreaPainter.java \
-    javax/swing/plaf/nimbus/ScrollBarPainter.java \
-    javax/swing/plaf/nimbus/SliderPainter.java \
-    javax/swing/plaf/nimbus/SpinnerPainter.java \
-    javax/swing/plaf/nimbus/SplitPanePainter.java \
-    javax/swing/plaf/nimbus/TabbedPanePainter.java \
-    sun/awt/resources/security-icon-bw16.png \
-    sun/awt/resources/security-icon-bw24.png \
-    sun/awt/resources/security-icon-bw32.png \
-    sun/awt/resources/security-icon-bw48.png \
-    sun/awt/resources/security-icon-interim16.png \
-    sun/awt/resources/security-icon-interim24.png \
-    sun/awt/resources/security-icon-interim32.png \
-    sun/awt/resources/security-icon-interim48.png \
-    sun/awt/resources/security-icon-yellow16.png \
-    sun/awt/resources/security-icon-yellow24.png \
-    sun/awt/resources/security-icon-yellow32.png \
-    sun/awt/resources/security-icon-yellow48.png \
-    sun/awt/X11/java-icon16.png \
-    sun/awt/X11/java-icon24.png \
-    sun/awt/X11/java-icon32.png \
-    sun/awt/X11/java-icon48.png \
-    .template \
-    #
-
-ifeq ($(call isTargetOs, macosx), true)
-  # exclude all X11 on Mac.
-  java.desktop_EXCLUDES += \
-      sun/awt/X11 \
-      sun/java2d/x11 \
-      sun/java2d/jules \
-      sun/java2d/xr \
-      com/sun/java/swing/plaf/gtk \
-      #
-  java.desktop_EXCLUDE_FILES += \
-      $(wildcard $(TOPDIR)/src/java.desktop/unix/classes/sun/java2d/*.java) \
-      $(wildcard $(TOPDIR)/src/java.desktop/unix/classes/sun/java2d/opengl/*.java) \
-      $(wildcard $(TOPDIR)/src/java.desktop/unix/classes/sun/awt/*.java) \
-      $(wildcard $(TOPDIR)/src/java.desktop/unix/classes/sun/font/*.java) \
-      #
-else
-  # TBD: figure out how to eliminate this long list
-  java.desktop_EXCLUDE_FILES += \
-      sun/awt/X11/ScreenFormat.java \
-      sun/awt/X11/XArc.java \
-      sun/awt/X11/XChar2b.java \
-      sun/awt/X11/XCharStruct.java \
-      sun/awt/X11/XClassHint.java \
-      sun/awt/X11/XComposeStatus.java \
-      sun/awt/X11/XExtCodes.java \
-      sun/awt/X11/XFontProp.java \
-      sun/awt/X11/XFontSetExtents.java \
-      sun/awt/X11/XFontStruct.java \
-      sun/awt/X11/XGCValues.java \
-      sun/awt/X11/XHostAddress.java \
-      sun/awt/X11/XIMCallback.java \
-      sun/awt/X11/XIMHotKeyTrigger.java \
-      sun/awt/X11/XIMHotKeyTriggers.java \
-      sun/awt/X11/XIMPreeditCaretCallbackStruct.java \
-      sun/awt/X11/XIMPreeditDrawCallbackStruct.java \
-      sun/awt/X11/XIMPreeditStateNotifyCallbackStruct.java \
-      sun/awt/X11/XIMStatusDrawCallbackStruct.java \
-      sun/awt/X11/XIMStringConversionCallbackStruct.java \
-      sun/awt/X11/XIMStringConversionText.java \
-      sun/awt/X11/XIMStyles.java \
-      sun/awt/X11/XIMText.java \
-      sun/awt/X11/XIMValuesList.java \
-      sun/awt/X11/XImage.java \
-      sun/awt/X11/XKeyboardControl.java \
-      sun/awt/X11/XKeyboardState.java \
-      sun/awt/X11/XOMCharSetList.java \
-      sun/awt/X11/XOMFontInfo.java \
-      sun/awt/X11/XOMOrientation.java \
-      sun/awt/X11/XPoint.java \
-      sun/awt/X11/XRectangle.java \
-      sun/awt/X11/XSegment.java \
-      sun/awt/X11/XStandardColormap.java \
-      sun/awt/X11/XTextItem.java \
-      sun/awt/X11/XTextItem16.java \
-      sun/awt/X11/XTextProperty.java \
-      sun/awt/X11/XTimeCoord.java \
-      sun/awt/X11/XWindowChanges.java \
-      sun/awt/X11/XdbeSwapInfo.java \
-      sun/awt/X11/XmbTextItem.java \
-      sun/awt/X11/XwcTextItem.java
-endif
-
-ifeq ($(call isTargetOs, windows), true)
-  java.desktop_EXCLUDES += com/sun/java/swing/plaf/gtk
-endif
-
-ifdef BUILD_HEADLESS_ONLY
-  java.desktop_EXCLUDES += sun/applet
-endif
-
-ifeq ($(call isTargetOs, windows macosx), false)
-  java.desktop_EXCLUDE_FILES += sun/awt/AWTCharset.java
-endif
-
-# These files do not appear in the build result of the old build. This
-# is because they are generated sources, but the AUTO_JAVA_FILES won't
-# pick them up since they aren't generated when the source dirs are
-# searched and they aren't referenced by any other classes so they won't
-# be picked up by implicit compilation. On a rebuild, they are picked up
-# and compiled. Exclude them here to produce the same rt.jar as the old
-# build does when building just once.
-java.desktop_EXCLUDE_FILES += \
-    javax/swing/plaf/nimbus/InternalFrameTitlePanePainter.java \
-    javax/swing/plaf/nimbus/OptionPaneMessageAreaPainter.java \
-    javax/swing/plaf/nimbus/ScrollBarPainter.java \
-    javax/swing/plaf/nimbus/SliderPainter.java \
-    javax/swing/plaf/nimbus/SpinnerPainter.java \
-    javax/swing/plaf/nimbus/SplitPanePainter.java \
-    javax/swing/plaf/nimbus/TabbedPanePainter.java \
-    #
-
-################################################################################
-
-java.scripting_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-java.scripting_COPY += .js
-java.scripting_CLEAN += .properties
-
-################################################################################
-
-java.instrument_DOCLINT += -Xdoclint:all/protected,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.logging_DOCLINT += -Xdoclint:all/protected,-reference,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.management_DOCLINT += -Xdoclint:all/protected,-reference,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.management.rmi_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:javax.*'
-
-################################################################################
-
-java.prefs_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.transaction.xa_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:javax.*'
-
-################################################################################
-
-java.sql_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.sql.rowset_DOCLINT += -Xdoclint:all/protected,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-java.sql.rowset_CLEAN_FILES += $(wildcard \
-    $(TOPDIR)/src/java.sql.rowset/share/classes/com/sun/rowset/*.properties \
-    $(TOPDIR)/src/java.sql.rowset/share/classes/javax/sql/rowset/*.properties)
-
-################################################################################
-
-java.rmi_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-java.rmi_CLEAN_FILES += $(wildcard \
-    $(TOPDIR)/src/java.rmi/share/classes/sun/rmi/registry/resources/*.properties \
-    $(TOPDIR)/src/java.rmi/share/classes/sun/rmi/server/resources/*.properties)
-
-################################################################################
-
-java.xml_DOCLINT += -Xdoclint:all/protected,-accessibility \
-    '-Xdoclint/package:$(call CommaList, javax.xml.catalog javax.xml.datatype \
-    javax.xml.transform javax.xml.validation javax.xml.xpath)'
-java.xml_CLEAN += .properties
-
-################################################################################
-
-java.naming_DOCLINT += -Xdoclint:all/protected,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-java.naming_CLEAN += jndiprovider.properties
-
-################################################################################
-
-java.security.jgss_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.smartcardio_DOCLINT += -Xdoclint:all/protected,-accessibility \
-    '-Xdoclint/package:java.*,javax.*'
-
-################################################################################
-
-java.xml.crypto_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:java.*,javax.*'
-java.xml.crypto_COPY += .dtd .xml
-java.xml.crypto_CLEAN += .properties
-
-################################################################################
-
-jdk.accessibility_DISABLED_WARNINGS += missing-explicit-ctor
-
-################################################################################
-
-jdk.charsets_COPY += .dat
-
-################################################################################
-
-################################################################################
-
-jdk.compiler_DOCLINT += -Xdoclint:all/protected \
-    '-Xdoclint/package:-com.sun.tools.*,-jdk.internal.*,sun.tools.serialver.resources.*'
-jdk.compiler_JAVAC_FLAGS += -XDstringConcat=inline
-jdk.compiler_CLEAN_FILES += $(wildcard \
-    $(patsubst %, $(TOPDIR)/src/jdk.compiler/share/classes/%/*.properties, \
-        sun/tools/serialver/resources))
-
-################################################################################
-
-jdk.hotspot.agent_DISABLED_WARNINGS += rawtypes serial cast static overrides \
-    fallthrough
-jdk.hotspot.agent_COPY += .gif .png .properties
-
-################################################################################
-
-jdk.editpad_COPY += .properties
-
-################################################################################
-
-jdk.jshell_COPY += .jsh .properties
-
-################################################################################
-
-jdk.internal.le_COPY += .properties .caps .txt
-
-################################################################################
-
-jdk.internal.opt_COPY += .properties
-
-################################################################################
-
-jdk.jcmd_COPY += _options
-
-################################################################################
-
-jdk.dynalink_CLEAN += .properties
-
-################################################################################
-
-jdk.javadoc_COPY += .xml .css .js .png
-
-################################################################################
-
-jdk.jartool_DISABLED_WARNINGS += missing-explicit-ctor
-jdk.jartool_JAVAC_FLAGS += -XDstringConcat=inline
-
-################################################################################
-
-jdk.httpserver_DISABLED_WARNINGS += missing-explicit-ctor
-
-################################################################################
-
-jdk.unsupported.desktop_DISABLED_WARNINGS += missing-explicit-ctor
-
-################################################################################
-
-# No SCTP implementation on Mac OS X or AIX. These classes should be excluded.
-SCTP_IMPL_CLASSES = \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/AssociationChange.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/AssociationImpl.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/PeerAddrChange.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/ResultContainer.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/SctpChannelImpl.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/SctpMultiChannelImpl.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/SctpNet.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/SctpNotification.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/SctpServerChannelImpl.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/SendFailed.java \
-    $(TOPDIR)/src/jdk.sctp/unix/classes/sun/nio/ch/sctp/Shutdown.java
-
-ifeq ($(call isTargetOs, macosx), true)
-  jdk.sctp_EXCLUDE_FILES += $(SCTP_IMPL_CLASSES)
-endif
-
-ifeq ($(call isTargetOs, aix), true)
-  jdk.sctp_EXCLUDE_FILES += $(SCTP_IMPL_CLASSES)
-endif
-
-################################################################################
-
-jdk.incubator.jpackage_COPY += .gif .png .txt .spec .script .prerm .preinst \
-    .postrm .postinst .list .sh .desktop .copyright .control .plist .template \
-    .icns .scpt .wxs .wxl .wxi .ico .bmp .tiff
-
-jdk.incubator.jpackage_CLEAN += .properties
-
-################################################################################
-
-jdk.jconsole_COPY += .gif .png
-
-jdk.jconsole_CLEAN_FILES += $(wildcard \
-    $(TOPDIR)/src/jdk.jconsole/share/classes/sun/tools/jconsole/resources/*.properties)
-
-################################################################################
-
-jdk.jdeps_COPY += .txt
-
-jdk.jdeps_CLEAN_FILES += $(wildcard \
-    $(TOPDIR)/src/jdk.jdeps/share/classes/com/sun/tools/jdeps/resources/*.properties \
-    $(TOPDIR)/src/jdk.jdeps/share/classes/com/sun/tools/javap/resources/*.properties)
-
-################################################################################
-
-jdk.jdi_EXCLUDES += \
-    com/sun/tools/example/debug/bdi \
-    com/sun/tools/example/debug/event \
-    com/sun/tools/example/debug/gui \
-    com/sun/jdi/doc-files \
-    #
-
-jdk.jdi_EXCLUDE_FILES += jdi-overview.html
-
-################################################################################
-
-jdk.dev_CLEAN_FILES += $(wildcard \
-    $(patsubst %, $(TOPDIR)/src/jdk.dev/share/classes/%/*.properties, \
-        com/sun/tools/script/shell))
-
-jdk.dev_COPY += .js oqlhelp.html .txt
-
-################################################################################
-
-jdk.internal.jvmstat_COPY += aliasmap
-
-################################################################################
-
-# -parameters provides method's parameters information in class file,
-# JVMCI compilers make use of that information for various sanity checks.
-# Don't use Indy strings concatenation to have good JVMCI startup performance.
-# The exports are needed since JVMCI is dynamically exported (see
-# jdk.vm.ci.services.internal.ReflectionAccessJDK::openJVMCITo).
-
-jdk.internal.vm.ci_JAVAC_FLAGS += -parameters -XDstringConcat=inline
-
-################################################################################
-
-jdk.internal.vm.compiler_JAVAC_FLAGS += -parameters -XDstringConcat=inline \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.aarch64=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.amd64=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.code=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.code.site=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.code.stack=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.common=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot.aarch64=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot.amd64=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.meta=jdk.internal.vm.compiler \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.runtime=jdk.internal.vm.compiler \
-    #
-
-jdk.internal.vm.compiler_EXCLUDES += \
-    jdk.internal.vm.compiler.collections.test \
-    jdk.tools.jaotc.test \
-    org.graalvm.compiler.api.directives.test \
-    org.graalvm.compiler.api.test \
-    org.graalvm.compiler.asm.aarch64.test \
-    org.graalvm.compiler.asm.amd64.test \
-    org.graalvm.compiler.asm.test \
-    org.graalvm.compiler.core.aarch64.test \
-    org.graalvm.compiler.core.amd64.test \
-    org.graalvm.compiler.core.jdk9.test \
-    org.graalvm.compiler.core.match.processor \
-    org.graalvm.compiler.core.test \
-    org.graalvm.compiler.debug.test \
-    org.graalvm.compiler.graph.test \
-    org.graalvm.compiler.hotspot.aarch64.test \
-    org.graalvm.compiler.hotspot.amd64.test \
-    org.graalvm.compiler.hotspot.jdk15.test \
-    org.graalvm.compiler.hotspot.jdk9.test \
-    org.graalvm.compiler.hotspot.lir.test \
-    org.graalvm.compiler.hotspot.test \
-    org.graalvm.compiler.jtt \
-    org.graalvm.compiler.lir.jtt \
-    org.graalvm.compiler.lir.test \
-    org.graalvm.compiler.loop.test \
-    org.graalvm.compiler.microbenchmarks \
-    org.graalvm.compiler.nodeinfo.processor \
-    org.graalvm.compiler.nodes.test \
-    org.graalvm.compiler.options.processor \
-    org.graalvm.compiler.options.test \
-    org.graalvm.compiler.phases.common.test \
-    org.graalvm.compiler.processor \
-    org.graalvm.compiler.replacements.jdk10.test \
-    org.graalvm.compiler.replacements.jdk12.test \
-    org.graalvm.compiler.replacements.jdk9.test \
-    org.graalvm.compiler.replacements.processor \
-    org.graalvm.compiler.replacements.test \
-    org.graalvm.compiler.serviceprovider.processor \
-    org.graalvm.compiler.test \
-    org.graalvm.compiler.virtual.bench \
-    org.graalvm.micro.benchmarks \
-    org.graalvm.util.test \
-    #
-
-################################################################################
-
-# -parameters provides method's parameters information in class file,
-# JVMCI compilers make use of that information for various sanity checks.
-# Don't use Indy strings concatenation to have good JAOTC startup performance.
-# The exports are needed since JVMCI is dynamically exported (see
-# jdk.vm.ci.services.internal.ReflectionAccessJDK::openJVMCITo).
-
-jdk.aot_JAVAC_FLAGS += -parameters -XDstringConcat=inline \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.aarch64=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.amd64=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.code=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.code.site=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.code.stack=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.common=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot.aarch64=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.hotspot.amd64=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.meta=jdk.internal.vm.compiler,jdk.aot \
-    --add-exports jdk.internal.vm.ci/jdk.vm.ci.runtime=jdk.internal.vm.compiler,jdk.aot \
-    #
-
-jdk.aot_EXCLUDES += \
-    jdk.tools.jaotc.test
-    #
-
-################################################################################
-
-sun.charsets_COPY += .dat
-
-################################################################################
-
-jdk.localedata_COPY += _dict _th
-# Exclude BreakIterator classes that are just used in compile process to generate
-# data files and shouldn't go in the product
-jdk.localedata_EXCLUDE_FILES += sun/text/resources/ext/BreakIteratorRules_th.java
-jdk.localedata_KEEP_ALL_TRANSLATIONS := true
-################################################################################
-
-jdk.jfr_DISABLED_WARNINGS += exports
-jdk.jfr_COPY := .xsd .xml .dtd
-jdk.jfr_JAVAC_FLAGS := -XDstringConcat=inline
-
 ################################################################################
 # If this is an imported module that has prebuilt classes, only compile
 # module-info.java.
@@ -582,60 +67,8 @@ MODULESOURCEPATH := $(call GetModuleSrcPath)
 # Add imported modules to the modulepath
 MODULEPATH := $(call PathList, $(IMPORT_MODULES_CLASSES))

-ifeq ($(MODULE), jdk.internal.vm.ci)
-  ## WORKAROUND jdk.internal.vm.ci source structure issue
-  JVMCI_MODULESOURCEPATH := $(MODULESOURCEPATH) \
-      $(subst /$(MODULE)/,/*/, $(filter-out %processor/src, \
-          $(wildcard $(TOPDIR)/src/$(MODULE)/share/classes/*/src)))
-  MODULESOURCEPATH := $(call PathList, $(JVMCI_MODULESOURCEPATH))
-endif
-
-ifeq ($(MODULE), jdk.internal.vm.compiler)
-  ## WORKAROUND jdk.internal.vm.compiler source structure issue
-  VM_COMPILER_MODULESOURCEPATH := $(MODULESOURCEPATH) \
-      $(subst /$(MODULE)/,/*/, $(filter-out %processor/src %test/src %jtt/src %bench/src %microbenchmarks/src, \
-          $(wildcard $(TOPDIR)/src/$(MODULE)/share/classes/*/src)))
-  MODULESOURCEPATH := $(call PathList, $(VM_COMPILER_MODULESOURCEPATH))
-endif
-
-ifeq ($(MODULE), jdk.aot)
-  ## WORKAROUND jdk.aot source structure issue
-  AOT_MODULESOURCEPATH := $(MODULESOURCEPATH) \
-      $(subst /$(MODULE)/,/*/, $(filter-out %processor/src, \
-          $(wildcard $(TOPDIR)/src/$(MODULE)/share/classes/*/src)))
-  MODULESOURCEPATH := $(call PathList, $(AOT_MODULESOURCEPATH))
-endif
-
-$(eval $(call SetupJavaCompilation, $(MODULE), \
-    SMALL_JAVA := false, \
-    MODULE := $(MODULE), \
-    SRC := $(wildcard $(MODULE_SRC_DIRS)), \
-    INCLUDES := $(JDK_USER_DEFINED_FILTER), \
-    FAIL_NO_SRC := $(FAIL_NO_SRC), \
-    BIN := $(if $($(MODULE)_BIN), $($(MODULE)_BIN), $(JDK_OUTPUTDIR)/modules), \
-    HEADERS := $(SUPPORT_OUTPUTDIR)/headers, \
-    CREATE_API_DIGEST := true, \
-    JAVAC_FLAGS := \
-        $($(MODULE)_DOCLINT) \
-        $($(MODULE)_JAVAC_FLAGS) \
-        --module-source-path $(MODULESOURCEPATH) \
-        --module-path $(MODULEPATH) \
-        --system none, \
-))
-
-TARGETS += $($(MODULE)) $($(MODULE)_COPY_EXTRA)
-
-# Declare dependencies between java compilations of different modules.
-# Since the other modules are declared in different invocations of this file,
-# use the macro to find the correct target file to depend on.
-# Only the javac compilation actually depends on other modules so limit
-# dependency declaration to that by using the *_COMPILE_TARGET variable.
-$($(MODULE)_COMPILE_TARGET): $(foreach d, $(call FindDepsForModule, $(MODULE)), \
-    $(call SetupJavaCompilationApiTarget, $d, \
-        $(if $($d_BIN), $($d_BIN), $(JDK_OUTPUTDIR)/modules/$d)))
-
 ################################################################################
-# Copy zh_HK properties files from zh_TW
+# Copy zh_HK properties files from zh_TW (needed by some modules)

 $(JDK_OUTPUTDIR)/modules/%_zh_HK.properties: $(JDK_OUTPUTDIR)/modules/%_zh_TW.properties
 	$(install-file)
@@ -650,13 +83,48 @@ CreateHkTargets = \
       .properties \
    )

-ifeq ($(MODULE), java.sql.rowset)
-  TARGETS += $(call CreateHkTargets, $(java.sql.rowset_CLEAN_FILES))
-endif
+################################################################################
+# Include module specific build settings

-ifeq ($(MODULE), java.rmi)
-  TARGETS += $(call CreateHkTargets, $(java.rmi_CLEAN_FILES))
-endif
+-include Java.gmk
+
+################################################################################
+# Setup the main compilation
+
+$(eval $(call SetupJavaCompilation, $(MODULE), \
+    SMALL_JAVA := false, \
+    MODULE := $(MODULE), \
+    SRC := $(wildcard $(MODULE_SRC_DIRS)), \
+    INCLUDES := $(JDK_USER_DEFINED_FILTER), \
+    FAIL_NO_SRC := $(FAIL_NO_SRC), \
+    BIN := $(if $($(MODULE)_BIN), $($(MODULE)_BIN), $(JDK_OUTPUTDIR)/modules), \
+    HEADERS := $(SUPPORT_OUTPUTDIR)/headers, \
+    CREATE_API_DIGEST := true, \
+    CLEAN := $(CLEAN), \
+    CLEAN_FILES := $(CLEAN_FILES), \
+    COPY := $(COPY), \
+    DISABLED_WARNINGS := $(DISABLED_WARNINGS_java), \
+    EXCLUDES := $(EXCLUDES), \
+    EXCLUDE_FILES := $(EXCLUDE_FILES), \
+    KEEP_ALL_TRANSLATIONS := $(KEEP_ALL_TRANSLATIONS), \
+    JAVAC_FLAGS := \
+        $(DOCLINT) \
+        $(JAVAC_FLAGS) \
+        --module-source-path $(MODULESOURCEPATH) \
+        --module-path $(MODULEPATH) \
+        --system none, \
+))
+
+TARGETS += $($(MODULE))
+
+# Declare dependencies between java compilations of different modules.
+# Since the other modules are declared in different invocations of this file,
+# use the macro to find the correct target file to depend on.
+# Only the javac compilation actually depends on other modules so limit
+# dependency declaration to that by using the *_COMPILE_TARGET variable.
+$($(MODULE)_COMPILE_TARGET): $(foreach d, $(call FindDepsForModule, $(MODULE)), \
+    $(call SetupJavaCompilationApiTarget, $d, \
+        $(if $($d_BIN), $($d_BIN), $(JDK_OUTPUTDIR)/modules/$d)))

 ################################################################################
 # If this is an imported module, copy the pre built classes and resources into
@@ -680,10 +148,6 @@ endif

 ################################################################################

-$(eval $(call IncludeCustomExtension, CompileJavaModules-post.gmk))
-
-################################################################################
-
 all: $(TARGETS)

 .PHONY: all
--- a/make/CompileModuleTools.gmk
+++ b/make/CompileModuleTools.gmk
@@ -33,8 +33,20 @@ include JavaCompilation.gmk

 TOOLS_CLASSES_DIR := $(BUILDTOOLS_OUTPUTDIR)/tools_jigsaw_classes

+# When using an external BUILDJDK, make it possible to shortcut building of
+# these tools using the BUILD_JAVAC instead of having to build the complete
+# exploded image first.
+ifeq ($(EXTERNAL_BUILDJDK), true)
+  COMPILER := buildjdk
+  TARGET_RELEASE := $(TARGET_RELEASE_NEWJDK)
+else
+  COMPILER := interim
+  TARGET_RELEASE := $(TARGET_RELEASE_NEWJDK_UPGRADED)
+endif
+
 $(eval $(call SetupJavaCompilation, BUILD_JIGSAW_TOOLS, \
-    TARGET_RELEASE := $(TARGET_RELEASE_NEWJDK_UPGRADED), \
+    TARGET_RELEASE := $(TARGET_RELEASE), \
+    COMPILER := $(COMPILER), \
    SRC := $(TOPDIR)/make/jdk/src/classes, \
    INCLUDES := build/tools/deps \
                build/tools/docs \
--- a/make/CompileToolsJdk.gmk
+++ b/make/CompileToolsJdk.gmk
@@ -56,7 +56,8 @@ $(eval $(call SetupJavaCompilation, BUILD_TOOLS_JDK, \
    DISABLED_WARNINGS := options, \
    JAVAC_FLAGS := \
        --add-exports java.desktop/sun.awt=ALL-UNNAMED \
-        --add-exports java.base/sun.text=ALL-UNNAMED, \
+        --add-exports java.base/sun.text=ALL-UNNAMED \
+        --add-exports java.base/sun.security.util=ALL-UNNAMED, \
 ))

 TARGETS += $(BUILD_TOOLS_JDK)
--- a/make/Docs.gmk
+++ b/make/Docs.gmk
@@ -1,4 +1,4 @@
-# Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -57,14 +57,11 @@ $(eval $(call IncludeCustomExtension, Docs.gmk))
 ################################################################################
 # Javadoc settings

+# Include configuration for URLs in generated javadoc
+include $(TOPDIR)/make/conf/javadoc.conf
+
 MODULES_SOURCE_PATH := $(call PathList, $(call GetModuleSrcPath) )

-# URLs
-JAVADOC_BASE_URL := https://docs.oracle.com/pls/topic/lookup?ctx=javase$(VERSION_NUMBER)&amp;id=homepage
-BUG_SUBMIT_URL := https://bugreport.java.com/bugreport/
-COPYRIGHT_URL := legal/copyright.html
-LICENSE_URL := https://www.oracle.com/java/javase/terms/license/java$(VERSION_NUMBER)speclicense.html
-REDISTRIBUTION_URL := https://www.oracle.com/technetwork/java/redist-137594.html

 # In order to get a specific ordering it's necessary to specify the total
 # ordering of tags as the tags are otherwise ordered in order of definition.
@@ -92,7 +89,6 @@ JAVADOC_TAGS := \
    -tag see \
    -taglet build.tools.taglet.ExtLink \
    -taglet build.tools.taglet.Incubating \
-    -taglet build.tools.taglet.Preview \
    -tagletpath $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
    $(CUSTOM_JAVADOC_TAGS) \
    #
@@ -458,7 +454,7 @@ $(eval $(call SetupApiDocsGeneration, JAVASE_API, \
    MODULES := $(JAVASE_MODULES), \
    SHORT_NAME := $(JAVASE_SHORT_NAME), \
    LONG_NAME := $(JAVASE_LONG_NAME), \
-    TARGET_DIR := $(IMAGES_OUTPUTDIR)/javase-docs/api, \
+    TARGET_DIR := $(DOCS_JAVASE_IMAGE_DIR)/api, \
 ))

 # Targets generated are returned in JAVASE_API_JAVADOC_TARGETS and
@@ -476,8 +472,8 @@ $(eval $(call SetupApiDocsGeneration, REFERENCE_API, \
    MODULES := $(JAVASE_MODULES), \
    SHORT_NAME := $(JAVASE_SHORT_NAME), \
    LONG_NAME := $(JAVASE_LONG_NAME), \
-    TARGET_DIR := $(IMAGES_OUTPUTDIR)/reference-docs/api, \
-    JAVADOC_CMD := $(JAVADOC), \
+    TARGET_DIR := $(DOCS_REFERENCE_IMAGE_DIR)/api, \
+    JAVADOC_CMD := $(DOCS_REFERENCE_JAVADOC), \
    OPTIONS := $(REFERENCE_OPTIONS), \
    TAGS := $(REFERENCE_TAGS), \
 ))
--- a/make/GenerateLinkOptData.gmk
+++ b/make/GenerateLinkOptData.gmk
@@ -61,7 +61,7 @@ endif

 # Save the stderr output of the command and print it along with stdout in case
 # something goes wrong.
-$(CLASSLIST_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXE_SUFFIX) $(CLASSLIST_JAR)
+$(CLASSLIST_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXECUTABLE_SUFFIX) $(CLASSLIST_JAR)
 	$(call MakeDir, $(LINK_OPT_DIR))
 	$(call LogInfo, Generating $(patsubst $(OUTPUTDIR)/%, %, $@))
 	$(call LogInfo, Generating $(patsubst $(OUTPUTDIR)/%, %, $(JLI_TRACE_FILE)))
@@ -94,7 +94,7 @@ $(CLASSLIST_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXE_SUFFIX) $(CLASSLIST_JAR)
 # dependencies, make will correctly rebuild both jli trace and classlist
 # incrementally using the single recipe above.
 $(CLASSLIST_FILE): $(JLI_TRACE_FILE)
-$(JLI_TRACE_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXE_SUFFIX) $(CLASSLIST_JAR)
+$(JLI_TRACE_FILE): $(INTERIM_IMAGE_DIR)/bin/java$(EXECUTABLE_SUFFIX) $(CLASSLIST_JAR)

 TARGETS += $(CLASSLIST_FILE) $(JLI_TRACE_FILE)

--- a/make/Images.gmk
+++ b/make/Images.gmk
@@ -44,7 +44,7 @@ ALL_MODULES := $(call FindAllModules)
 $(eval $(call ReadImportMetaData))

 JRE_MODULES += $(filter $(ALL_MODULES), $(BOOT_MODULES) \
-    $(PLATFORM_MODULES) $(JRE_TOOL_MODULES))
+    $(PLATFORM_MODULES) jdk.jdwp.agent)
 JDK_MODULES += $(ALL_MODULES)

 JRE_MODULES_LIST := $(call CommaList, $(JRE_MODULES))
--- a/make/Init.gmk
+++ b/make/Init.gmk
@@ -200,7 +200,7 @@ ifeq ($(HAS_SPEC),)
 	            COMPARE_BUILD="$(COMPARE_BUILD):NODRYRUN=true" main && \
 	        $(MAKE) $(MFLAGS) $(MAKE_LOG_FLAGS) -r -R -f $(topdir)/make/Init.gmk \
 	            SPEC=$(spec) HAS_SPEC=true ACTUAL_TOPDIR=$(topdir) \
-	            COMPARE_BUILD="$(COMPARE_BUILD)" post-compare-build && \
+	            COMPARE_BUILD="$(COMPARE_BUILD):NODRYRUN=true" post-compare-build && \
 	    ) \
 	  ) true ) \
 	  $(eval TARGET_DONE=true) \
--- a/make/InterimImage.gmk
+++ b/make/InterimImage.gmk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -32,7 +32,7 @@ include Modules.gmk
 ################################################################################

 # Use this file inside the image as target for make rule
-JIMAGE_TARGET_FILE := bin/java$(EXE_SUFFIX)
+JIMAGE_TARGET_FILE := bin/java$(EXECUTABLE_SUFFIX)

 INTERIM_MODULES_LIST := $(call CommaList, $(INTERIM_IMAGE_MODULES))

--- a/make/Main.gmk
+++ b/make/Main.gmk
@@ -90,7 +90,6 @@ $(eval $(call SetupTarget, buildtools-jdk, \

 $(eval $(call SetupTarget, buildtools-modules, \
    MAKEFILE := CompileModuleTools, \
-    DEPS := exploded-image-base, \
 ))

 $(eval $(call SetupTarget, buildtools-hotspot, \
@@ -112,7 +111,6 @@ $(eval $(call SetupTarget, generate-exported-symbols, \
 $(eval $(call DeclareRecipesForPhase, GENSRC, \
    TARGET_SUFFIX := gensrc-src, \
    FILE_PREFIX := Gensrc, \
-    MAKE_SUBDIR := gensrc, \
    CHECK_MODULES := $(ALL_MODULES), \
 ))

@@ -150,7 +148,6 @@ ALL_TARGETS += $(GENSRC_TARGETS)
 $(eval $(call DeclareRecipesForPhase, GENDATA, \
    TARGET_SUFFIX := gendata, \
    FILE_PREFIX := Gendata, \
-    MAKE_SUBDIR := gendata, \
    CHECK_MODULES := $(ALL_MODULES), \
 ))

@@ -161,7 +158,6 @@ ALL_TARGETS += $(GENDATA_TARGETS)
 $(eval $(call DeclareRecipesForPhase, COPY, \
    TARGET_SUFFIX := copy, \
    FILE_PREFIX := Copy, \
-    MAKE_SUBDIR := copy, \
    CHECK_MODULES := $(ALL_MODULES), \
 ))

@@ -191,6 +187,7 @@ JAVA_TARGETS := $(addsuffix -java, $(JAVA_MODULES))
 define DeclareCompileJavaRecipe
  $1-java:
 	+($(CD) $(TOPDIR)/make && $(MAKE) $(MAKE_ARGS) \
+	$(patsubst %,-I%/modules/$1,$(PHASE_MAKEDIRS)) \
 	    -f CompileJavaModules.gmk MODULE=$1)
 endef

@@ -203,7 +200,6 @@ ALL_TARGETS += $(JAVA_TARGETS)
 $(eval $(call DeclareRecipesForPhase, LIBS, \
    TARGET_SUFFIX := libs, \
    FILE_PREFIX := Lib, \
-    MAKE_SUBDIR := lib, \
    CHECK_MODULES := $(ALL_MODULES), \
 ))

@@ -216,7 +212,6 @@ ALL_TARGETS += $(LIBS_TARGETS)
 $(eval $(call DeclareRecipesForPhase, STATIC_LIBS, \
    TARGET_SUFFIX := static-libs, \
    FILE_PREFIX := Lib, \
-    MAKE_SUBDIR := lib, \
    CHECK_MODULES := $(ALL_MODULES), \
    EXTRA_ARGS := STATIC_LIBS=true, \
 ))
@@ -228,7 +223,6 @@ ALL_TARGETS += $(STATIC_LIBS_TARGETS)
 $(eval $(call DeclareRecipesForPhase, LAUNCHER, \
    TARGET_SUFFIX := launchers, \
    FILE_PREFIX := Launcher, \
-    MAKE_SUBDIR := launcher, \
    CHECK_MODULES := $(ALL_MODULES), \
 ))

@@ -345,7 +339,7 @@ $(eval $(call SetupTarget, test-image-demos-jdk, \

 $(eval $(call SetupTarget, generate-summary, \
    MAKEFILE := GenerateModuleSummary, \
-    DEPS := jmods buildtools-modules, \
+    DEPS := jmods buildtools-modules runnable-buildjdk, \
 ))

 ################################################################################
@@ -475,7 +469,7 @@ $(eval $(call SetupTarget, docs-jdk-api-javadoc, \
 $(eval $(call SetupTarget, docs-jdk-api-modulegraph, \
    MAKEFILE := Docs, \
    TARGET := docs-jdk-api-modulegraph, \
-    DEPS := exploded-image buildtools-modules, \
+    DEPS := buildtools-modules runnable-buildjdk, \
 ))

 $(eval $(call SetupTarget, docs-javase-api-javadoc, \
@@ -486,7 +480,7 @@ $(eval $(call SetupTarget, docs-javase-api-javadoc, \
 $(eval $(call SetupTarget, docs-javase-api-modulegraph, \
    MAKEFILE := Docs, \
    TARGET := docs-javase-api-modulegraph, \
-    DEPS := exploded-image buildtools-modules, \
+    DEPS := buildtools-modules runnable-buildjdk, \
 ))

 $(eval $(call SetupTarget, docs-reference-api-javadoc, \
@@ -497,7 +491,7 @@ $(eval $(call SetupTarget, docs-reference-api-javadoc, \
 $(eval $(call SetupTarget, docs-reference-api-modulegraph, \
    MAKEFILE := Docs, \
    TARGET := docs-reference-api-modulegraph, \
-    DEPS := exploded-image buildtools-modules, \
+    DEPS := buildtools-modules runnable-buildjdk, \
 ))

 # The gensrc steps for jdk.jdi create html spec files.
@@ -755,12 +749,24 @@ $(eval $(call SetupTarget, test-bundles, \
    DEPS := test-image, \
 ))

-$(eval $(call SetupTarget, docs-bundles, \
+$(eval $(call SetupTarget, docs-jdk-bundles, \
    MAKEFILE := Bundles, \
-    TARGET := docs-bundles, \
+    TARGET := docs-jdk-bundles, \
    DEPS := docs-image, \
 ))

+$(eval $(call SetupTarget, docs-javase-bundles, \
+    MAKEFILE := Bundles, \
+    TARGET := docs-javase-bundles, \
+    DEPS := docs-javase-image, \
+))
+
+$(eval $(call SetupTarget, docs-reference-bundles, \
+    MAKEFILE := Bundles, \
+    TARGET := docs-reference-bundles, \
+    DEPS := docs-reference-image, \
+))
+
 $(eval $(call SetupTarget, static-libs-bundles, \
    MAKEFILE := Bundles, \
    TARGET := static-libs-bundles, \
@@ -951,10 +957,13 @@ else
      $(JMOD_TARGETS) $(INTERIM_JMOD_TARGETS): java.base-libs java.base-copy \
          java.base-gendata jdk.jlink-launchers java
    endif
-  else
-    # The normal non cross compilation case uses needs to wait for the full
+  else ifeq ($(EXTERNAL_BUILDJDK), false)
+    # The normal non cross compilation usecase needs to wait for the full
    # exploded-image to avoid a race with the optimize target.
    $(JMOD_TARGETS) $(INTERIM_JMOD_TARGETS): exploded-image
+    # The buildtools-modules are used for the exploded-image-optimize target,
+    # but can be built either using the exploded-image or an external BUILDJDK.
+    buildtools-modules: exploded-image-base
  endif

  # All modules include the main license files from java.base.
@@ -1075,6 +1084,18 @@ ifneq ($(COMPILE_TYPE), cross)
  exploded-image: exploded-image-optimize
 endif

+# The runnable-buildjdk target guarantees that the buildjdk is done
+# building and ready to be used. The exact set of dependencies it needs
+# depends on what kind of buildjdk is used for the current configuration.
+runnable-buildjdk:
+ifeq ($(CREATE_BUILDJDK), true)
+  ifneq ($(CREATING_BUILDJDK), true)
+    runnable-buildjdk: create-buildjdk
+  endif
+else ifeq ($(EXTERNAL_BUILDJDK), false)
+  runnable-buildjdk: exploded-image
+endif
+
 create-buildjdk: create-buildjdk-interim-image

 docs-jdk-api: docs-jdk-api-javadoc
@@ -1128,8 +1149,16 @@ ifeq ($(call isTargetOs, macosx), true)
  legacy-images: mac-legacy-jre-bundle
 endif

-# This target builds the documentation image
-docs-image: docs-jdk
+# These targets build the various documentation images
+docs-jdk-image: docs-jdk
+docs-javase-image: docs-javase
+docs-reference-image: docs-reference
+# The docs-jdk-image is what most users expect to be built
+docs-image: docs-jdk-image
+all-docs-images: docs-jdk-image docs-javase-image docs-reference-image
+
+docs-bundles: docs-jdk-bundles
+all-docs-bundles: docs-jdk-bundles docs-javase-bundles docs-reference-bundles

 # This target builds the test image
 test-image: prepare-test-image test-image-jdk-jtreg-native \
@@ -1162,7 +1191,7 @@ endif
 ################################################################################

 # all-images builds all our deliverables as images.
-all-images: product-images test-image docs-image
+all-images: product-images test-image all-docs-images

 # all-bundles packages all our deliverables as tar.gz bundles.
 all-bundles: product-bundles test-bundles docs-bundles static-libs-bundles
@@ -1170,10 +1199,11 @@ all-bundles: product-bundles test-bundles docs-bundles static-libs-bundles
 ALL_TARGETS += buildtools hotspot hotspot-libs hotspot-gensrc gensrc gendata \
    copy java libs static-libs launchers jmods \
    jdk.jdwp.agent-gensrc $(ALL_MODULES) demos \
-    exploded-image-base exploded-image \
+    exploded-image-base exploded-image runnable-buildjdk \
    create-buildjdk docs-jdk-api docs-javase-api docs-reference-api docs-jdk \
    docs-javase docs-reference docs-javadoc mac-bundles product-images legacy-images \
-    docs-image test-image all-images \
+    docs-image docs-javase-image docs-reference-image all-docs-images \
+    docs-bundles all-docs-bundles test-image all-images \
    all-bundles

 ################################################################################
--- a/make/MainSupport.gmk
+++ b/make/MainSupport.gmk
@@ -150,9 +150,7 @@ define DeclareRecipeForModuleMakefile
  $2-$$($1_TARGET_SUFFIX):
 	+($(CD) $(TOPDIR)/make && $(MAKE) $(MAKE_ARGS) \
 	    -f ModuleWrapper.gmk -I $$(TOPDIR)/make/common/modules  \
-	    $$(addprefix -I, $$(PHASE_MAKEDIRS) \
-	        $$(addsuffix /modules/$2, $$(PHASE_MAKEDIRS)) \
-	    ) \
+	    $$(patsubst %,-I%/modules/$2,$$(PHASE_MAKEDIRS)) \
 	    MODULE=$2 MAKEFILE_PREFIX=$$($1_FILE_PREFIX) $$($1_EXTRA_ARGS))

 endef
@@ -185,7 +183,6 @@ endef
 # Param 1: Name of list to add targets to
 # Named params:
 # TARGET_SUFFIX : Suffix of target to create for recipe
-# MAKE_SUBDIR : Subdir for this build phase
 # FILE_PREFIX : File prefix for this build phase
 # CHECK_MODULES : List of modules to try
 # MULTIPLE_MAKEFILES : Set to true to handle makefiles for the same module and
--- a/make/ModuleWrapper.gmk
+++ b/make/ModuleWrapper.gmk
@@ -39,7 +39,7 @@ include MakeBase.gmk
 TARGETS :=

 # Include the file being wrapped.
-include modules/$(MODULE)/$(MAKEFILE_PREFIX).gmk
+include $(MAKEFILE_PREFIX).gmk

 # Setup copy rules from the modules directories to the jdk image directory.
 ifeq ($(call isTargetOs, windows), true)
--- a/make/ReleaseFile.gmk
+++ b/make/ReleaseFile.gmk
@@ -53,6 +53,7 @@ define create-info-file
  $(call info-file-item, "JAVA_VERSION_DATE", "$(VERSION_DATE)")
  $(call info-file-item, "OS_NAME", "$(RELEASE_FILE_OS_NAME)")
  $(call info-file-item, "OS_ARCH", "$(RELEASE_FILE_OS_ARCH)")
+  $(call info-file-item, "LIBC", "$(RELEASE_FILE_LIBC)")
 endef

 # Param 1 - The file containing the MODULES list
--- a/make/RunTests.gmk
+++ b/make/RunTests.gmk
@@ -60,19 +60,14 @@ define SetTestOpt
  endif
 endef

-# Setup _NT_SYMBOL_PATH on Windows
+# Setup _NT_SYMBOL_PATH on Windows, which points to our pdb files.
 ifeq ($(call isTargetOs, windows), true)
  ifndef _NT_SYMBOL_PATH
-    # Can't use PathList here as it adds quotes around the value.
-    _NT_SYMBOL_PATH := \
-        $(subst $(SPACE),;,$(strip \
-            $(foreach p, $(sort $(dir $(wildcard \
-                $(addprefix $(SYMBOLS_IMAGE_DIR)/bin/, *.pdb */*.pdb)))), \
-              $(call FixPath, $p) \
-            ) \
-        ))
-    export _NT_SYMBOL_PATH
-    $(call LogDebug, Rewriting _NT_SYMBOL_PATH to $(_NT_SYMBOL_PATH))
+    SYMBOL_PATH := $(call PathList, $(sort $(patsubst %/, %, $(dir $(wildcard \
+        $(addprefix $(SYMBOLS_IMAGE_DIR)/bin/, *.pdb */*.pdb))))))
+    export _NT_SYMBOL_PATH := $(subst \\,\, $(call FixPath, \
+        $(subst $(DQUOTE),, $(SYMBOL_PATH))))
+    $(call LogDebug, Setting _NT_SYMBOL_PATH to $(_NT_SYMBOL_PATH))
  endif
 endif

@@ -609,9 +604,11 @@ define SetupRunGtestTestBody
 	$$(call LogWarn, Running test '$$($1_TEST)')
 	$$(call MakeDir, $$($1_TEST_RESULTS_DIR) $$($1_TEST_SUPPORT_DIR))
 	$$(call ExecuteWithLog, $$($1_TEST_SUPPORT_DIR)/gtest, ( \
+	    $$(CD) $$($1_TEST_SUPPORT_DIR) && \
 	    $$(FIXPATH) $$(TEST_IMAGE_DIR)/hotspot/gtest/$$($1_VARIANT)/gtestLauncher \
 	        -jdk $(JDK_UNDER_TEST) $$($1_GTEST_FILTER) \
 	        --gtest_output=xml:$$($1_TEST_RESULTS_DIR)/gtest.xml \
+	        --gtest_catch_exceptions=0 \
 	        $$($1_GTEST_REPEAT) $$(GTEST_OPTIONS) $$(GTEST_VM_OPTIONS) \
 	        $$(GTEST_JAVA_OPTIONS) $$($1_AOT_OPTIONS) \
 	        > >($(TEE) $$($1_TEST_RESULTS_DIR)/gtest.txt) \
--- a/make/RunTestsPrebuilt.gmk
+++ b/make/RunTestsPrebuilt.gmk
@@ -189,15 +189,11 @@ ifeq ($(OPENJDK_TARGET_CPU), x86_64)
 endif

 ifeq ($(OPENJDK_TARGET_OS), windows)
-  ifeq ($(wildcard $(TEST_IMAGE_DIR)/bin/fixpath.exe), )
-    $(info Error: fixpath is missing from test image '$(TEST_IMAGE_DIR)')
-    $(error Cannot continue.)
-  endif
-  FIXPATH := $(TEST_IMAGE_DIR)/bin/fixpath.exe -c
-  PATH_SEP:=;
+  FIXPATH_BASE := $(BASH) $(TOPDIR)/make/scripts/fixpath.sh
+  FIXPATH := $(FIXPATH_BASE) exec
 else
+  FIXPATH_BASE :=
  FIXPATH :=
-  PATH_SEP:=:
 endif

 # Check number of cores and memory in MB
@@ -279,8 +275,8 @@ $(call CreateNewSpec, $(NEW_SPEC), \
    MAKE := $(MAKE), \
    BASH := $(BASH), \
    JIB_JAR := $(JIB_JAR), \
+    FIXPATH_BASE := $(FIXPATH_BASE), \
    FIXPATH := $(FIXPATH), \
-    PATH_SEP := $(PATH_SEP), \
    OPENJDK_TARGET_OS := $(OPENJDK_TARGET_OS), \
    OPENJDK_TARGET_OS_TYPE := $(OPENJDK_TARGET_OS_TYPE), \
    OPENJDK_TARGET_OS_ENV := $(OPENJDK_TARGET_OS_ENV), \
--- a/make/RunTestsPrebuiltSpec.gmk
+++ b/make/RunTestsPrebuiltSpec.gmk
@@ -116,16 +116,13 @@ JAVAC_CMD := $(BOOT_JDK)/bin/javac
 JAR_CMD := $(BOOT_JDK)/bin/jar
 JLINK_CMD := $(JDK_OUTPUTDIR)/bin/jlink
 JMOD_CMD := $(JDK_OUTPUTDIR)/bin/jmod
-JARSIGNER_CMD := $(BOOT_JDK)/bin/jarsigner

 JAVA := $(FIXPATH) $(JAVA_CMD) $(JAVA_FLAGS_BIG) $(JAVA_FLAGS)
 JAVA_SMALL := $(FIXPATH) $(JAVA_CMD) $(JAVA_FLAGS_SMALL) $(JAVA_FLAGS)
-JAVA_DETACH := $(FIXPATH) $(FIXPATH_DETACH_FLAG) $(JAVA_CMD) $(JAVA_FLAGS_BIG) $(JAVA_FLAGS)
 JAVAC := $(FIXPATH) $(JAVAC_CMD)
 JAR := $(FIXPATH) $(JAR_CMD)
 JLINK := $(FIXPATH) $(JLINK_CMD)
 JMOD := $(FIXPATH) $(JMOD_CMD)
-JARSIGNER := $(FIXPATH) $(JARSIGNER_CMD)

 BUILD_JAVA := $(JDK_IMAGE_DIR)/bin/JAVA
 ################################################################################
@@ -153,7 +150,6 @@ LN := ln
 MIG := mig
 MKDIR := mkdir
 MV := mv
-NAWK := nawk
 NICE := nice
 PATCH := patch
 PRINTF := printf
@@ -167,7 +163,6 @@ TAIL := tail
 TEE := tee
 TR := tr
 TOUCH := touch
-UNIQ := uniq
 WC := wc
 XARGS := xargs
 ZIPEXE := zip
@@ -178,7 +173,7 @@ HG := hg
 ULIMIT := ulimit

 ifeq ($(OPENJDK_BUILD_OS), windows)
-  CYGPATH := cygpath
+  PATHTOOL := cygpath
 endif

 ################################################################################
--- a/make/TestImage.gmk
+++ b/make/TestImage.gmk
@@ -30,34 +30,25 @@ include MakeBase.gmk

 ############################################################################

-ifeq ($(call isTargetOs, windows), true)
-  FIXPATH_COPY := $(TEST_IMAGE_DIR)/bin/fixpath.exe
-
-  $(FIXPATH_COPY): $(firstword $(FIXPATH))
-	$(call install-file)
-
-  FIXPATH_WORKSPACE_ROOT := $(call FixPath, $(WORKSPACE_ROOT))
-  FIXPATH_OUTPUTDIR := $(call FixPath, $(OUTPUTDIR))
-else
-  FIXPATH_WORKSPACE_ROOT := $(WORKSPACE_ROOT)
-  FIXPATH_OUTPUTDIR := $(OUTPUTDIR)
-endif
-
-
 BUILD_INFO_PROPERTIES := $(TEST_IMAGE_DIR)/build-info.properties

 $(BUILD_INFO_PROPERTIES):
 	$(call MakeTargetDir)
 	$(ECHO) "# Build info properties for JDK tests" > $@
-	$(ECHO) "build.workspace.root=$(FIXPATH_WORKSPACE_ROOT)" >> $@
-	$(ECHO) "build.output.root=$(FIXPATH_OUTPUTDIR)" >> $@
+	$(ECHO) "build.workspace.root=$(call FixPath, $(WORKSPACE_ROOT))" >> $@
+	$(ECHO) "build.output.root=$(call FixPath, $(OUTPUTDIR))" >> $@

-prepare-test-image: $(FIXPATH_COPY) $(BUILD_INFO_PROPERTIES)
-	$(call MakeDir, $(TEST_IMAGE_DIR))
-	$(ECHO) > $(TEST_IMAGE_DIR)/Readme.txt 'JDK test image'
+README := $(TEST_IMAGE_DIR)/Readme.txt
+
+$(README):
+	$(call MakeTargetDir)
+	$(ECHO) > $@ 'JDK test image'
+
+TARGETS += $(BUILD_INFO_PROPERTIES) $(README)

 ################################################################################

+prepare-test-image: $(TARGETS)
 all: prepare-test-image

 .PHONY: default all prepare-test-image
--- a/make/ToolsJdk.gmk
+++ b/make/ToolsJdk.gmk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -67,8 +67,9 @@ TOOL_GENERATECURRENCYDATA = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_
 TOOL_TZDB = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
    build.tools.tzdb.TzdbZoneRulesCompiler

-TOOL_BLACKLISTED_CERTS = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
-    build.tools.blacklistedcertsconverter.BlacklistedCertsConverter
+TOOL_BLOCKED_CERTS = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
+    --add-exports java.base/sun.security.util=ALL-UNNAMED \
+    build.tools.blockedcertsconverter.BlockedCertsConverter

 TOOL_MAKEJAVASECURITY = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
    build.tools.makejavasecurity.MakeJavaSecurity
--- a/make/autoconf/basic.m4
+++ b/make/autoconf/basic.m4
@@ -70,27 +70,18 @@ AC_DEFUN_ONCE([BASIC_SETUP_PATHS],
  fi

  if test "x$OPENJDK_TARGET_OS" = "xwindows"; then
-    PATH_SEP=";"
-    EXE_SUFFIX=".exe"
-    BASIC_CHECK_PATHS_WINDOWS
-  else
-    PATH_SEP=":"
-    EXE_SUFFIX=""
+    BASIC_SETUP_PATHS_WINDOWS
  fi
-  AC_SUBST(PATH_SEP)
-  AC_SUBST(EXE_SUFFIX)

  # We get the top-level directory from the supporting wrappers.
+  BASIC_WINDOWS_VERIFY_DIR($TOPDIR, source)
+  UTIL_FIXUP_PATH(TOPDIR)
  AC_MSG_CHECKING([for top-level directory])
  AC_MSG_RESULT([$TOPDIR])
  AC_SUBST(TOPDIR)
-  AC_SUBST(CONFIGURE_START_DIR)
-
-  # We can only call UTIL_FIXUP_PATH after BASIC_CHECK_PATHS_WINDOWS.
-  UTIL_FIXUP_PATH(TOPDIR)
-  UTIL_FIXUP_PATH(CONFIGURE_START_DIR)

  if test "x$CUSTOM_ROOT" != x; then
+    BASIC_WINDOWS_VERIFY_DIR($CUSTOM_ROOT, custom root)
    UTIL_FIXUP_PATH(CUSTOM_ROOT)
    WORKSPACE_ROOT="${CUSTOM_ROOT}"
  else
@@ -98,6 +89,9 @@ AC_DEFUN_ONCE([BASIC_SETUP_PATHS],
  fi
  AC_SUBST(WORKSPACE_ROOT)

+  UTIL_FIXUP_PATH(CONFIGURE_START_DIR)
+  AC_SUBST(CONFIGURE_START_DIR)
+
  # Locate the directory of this script.
  AUTOCONF_DIR=$TOPDIR/make/autoconf

@@ -117,6 +111,16 @@ AC_DEFUN([BASIC_EVAL_DEVKIT_VARIABLE],
  fi
 ])

+###############################################################################
+# Evaluates platform specific overrides for build devkit variables.
+# $1: Name of variable
+AC_DEFUN([BASIC_EVAL_BUILD_DEVKIT_VARIABLE],
+[
+  if test "x[$]$1" = x; then
+    eval $1="\${$1_${OPENJDK_BUILD_CPU}}"
+  fi
+])
+
 ###############################################################################
 AC_DEFUN_ONCE([BASIC_SETUP_DEVKIT],
 [
@@ -224,9 +228,12 @@ AC_DEFUN_ONCE([BASIC_SETUP_DEVKIT],
    # if no Xcode installed, xcodebuild exits with 1
    # if Xcode is installed, even if xcode-select is misconfigured, then it exits with 0
    if test "x$DEVKIT_ROOT" != x || /usr/bin/xcodebuild -version >/dev/null 2>&1; then
-      # We need to use xcodebuild in the toolchain dir provided by the user, this will
-      # fall back on the stub binary in /usr/bin/xcodebuild
-      AC_PATH_PROG([XCODEBUILD], [xcodebuild], [/usr/bin/xcodebuild], [$TOOLCHAIN_PATH])
+      # We need to use xcodebuild in the toolchain dir provided by the user
+      UTIL_LOOKUP_PROGS(XCODEBUILD, xcodebuild, $TOOLCHAIN_PATH)
+      if test x$XCODEBUILD = x; then
+        # fall back on the stub binary in /usr/bin/xcodebuild
+        XCODEBUILD=/usr/bin/xcodebuild
+      fi
    else
      # this should result in SYSROOT being empty, unless --with-sysroot is provided
      # when only the command line tools are installed there are no SDKs, so headers
@@ -296,6 +303,7 @@ AC_DEFUN_ONCE([BASIC_SETUP_DEVKIT],
  AC_MSG_RESULT([$SYSROOT])
  AC_MSG_CHECKING([for toolchain path])
  AC_MSG_RESULT([$TOOLCHAIN_PATH])
+  AC_SUBST(TOOLCHAIN_PATH)
  AC_MSG_CHECKING([for extra path])
  AC_MSG_RESULT([$EXTRA_PATH])
 ])
@@ -370,6 +378,7 @@ AC_DEFUN_ONCE([BASIC_SETUP_OUTPUT_DIR],
  AC_MSG_CHECKING([what configuration name to use])
  AC_MSG_RESULT([$CONF_NAME])

+  BASIC_WINDOWS_VERIFY_DIR($OUTPUTDIR, output)
  UTIL_FIXUP_PATH(OUTPUTDIR)

  CONFIGURESUPPORT_OUTPUTDIR="$OUTPUTDIR/configure-support"
@@ -406,26 +415,16 @@ AC_DEFUN([BASIC_CHECK_DIR_ON_LOCAL_DISK],
  # df -l lists only local disks; if the given directory is not found then
  # a non-zero exit code is given
  if test "x$DF" = x; then
-    if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then
-      # msys does not have df; use Windows "net use" instead.
-      IS_NETWORK_DISK=`net use | grep \`pwd -W | cut -d ":" -f 1 | tr a-z A-Z\`:`
-      if test "x$IS_NETWORK_DISK" = x; then
-        $2
-      else
-        $3
-      fi
-    else
-      # No df here, say it's local
-      $2
-    fi
+    # No df here, say it's local
+    $2
  else
    # JDK-8189619
    # df on AIX does not understand -l. On modern AIXes it understands "-T local" which
    # is the same. On older AIXes we just continue to live with a "not local build" warning.
    if test "x$OPENJDK_TARGET_OS" = xaix; then
      DF_LOCAL_ONLY_OPTION='-T local'
-    elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
-      # In WSL, we can only build on a drvfs file system (that is, a mounted real Windows drive)
+    elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl1"; then
+      # In WSL1, we can only build on a drvfs file system (that is, a mounted real Windows drive)
      DF_LOCAL_ONLY_OPTION='-t drvfs'
    else
      DF_LOCAL_ONLY_OPTION='-l'
--- a/make/autoconf/basic_tools.m4
+++ b/make/autoconf/basic_tools.m4
@@ -28,38 +28,37 @@
 # but is used by much of the early bootstrap code.
 AC_DEFUN_ONCE([BASIC_SETUP_FUNDAMENTAL_TOOLS],
 [
-  # Start with tools that do not need have cross compilation support
-  # and can be expected to be found in the default PATH. These tools are
-  # used by configure.
+  # Bootstrapping: These tools are needed by UTIL_LOOKUP_PROGS
+  AC_PATH_PROGS(BASENAME, basename)
+  UTIL_CHECK_NONEMPTY(BASENAME)
+  AC_PATH_PROGS(DIRNAME, dirname)
+  UTIL_CHECK_NONEMPTY(DIRNAME)
+  AC_PATH_PROGS(FILE, file)
+  UTIL_CHECK_NONEMPTY(FILE)
+  AC_PATH_PROGS(LDD, ldd)

-  # First are all the simple required tools.
-  UTIL_REQUIRE_PROGS(BASENAME, basename)
+  # First are all the fundamental required tools.
  UTIL_REQUIRE_PROGS(BASH, bash)
  UTIL_REQUIRE_PROGS(CAT, cat)
  UTIL_REQUIRE_PROGS(CHMOD, chmod)
-  UTIL_REQUIRE_PROGS(CMP, cmp)
-  UTIL_REQUIRE_PROGS(COMM, comm)
  UTIL_REQUIRE_PROGS(CP, cp)
  UTIL_REQUIRE_PROGS(CUT, cut)
  UTIL_REQUIRE_PROGS(DATE, date)
-  UTIL_REQUIRE_PROGS(DIFF, [gdiff diff])
-  UTIL_REQUIRE_PROGS(DIRNAME, dirname)
+  UTIL_REQUIRE_PROGS(DIFF, gdiff diff)
  UTIL_REQUIRE_PROGS(ECHO, echo)
  UTIL_REQUIRE_PROGS(EXPR, expr)
-  UTIL_REQUIRE_PROGS(FILE, file)
  UTIL_REQUIRE_PROGS(FIND, find)
-  UTIL_REQUIRE_PROGS(HEAD, head)
  UTIL_REQUIRE_PROGS(GUNZIP, gunzip)
  UTIL_REQUIRE_PROGS(GZIP, pigz gzip)
+  UTIL_REQUIRE_PROGS(HEAD, head)
  UTIL_REQUIRE_PROGS(LN, ln)
  UTIL_REQUIRE_PROGS(LS, ls)
  # gmkdir is known to be safe for concurrent invocations with -p flag.
-  UTIL_REQUIRE_PROGS(MKDIR, [gmkdir mkdir])
+  UTIL_REQUIRE_PROGS(MKDIR, gmkdir mkdir)
  UTIL_REQUIRE_PROGS(MKTEMP, mktemp)
  UTIL_REQUIRE_PROGS(MV, mv)
-  UTIL_REQUIRE_PROGS(NAWK, [nawk gawk awk])
+  UTIL_REQUIRE_PROGS(AWK, gawk nawk awk)
  UTIL_REQUIRE_PROGS(PRINTF, printf)
-  UTIL_REQUIRE_PROGS(READLINK, [greadlink readlink])
  UTIL_REQUIRE_PROGS(RM, rm)
  UTIL_REQUIRE_PROGS(RMDIR, rmdir)
  UTIL_REQUIRE_PROGS(SH, sh)
@@ -70,33 +69,31 @@ AC_DEFUN_ONCE([BASIC_SETUP_FUNDAMENTAL_TOOLS],
  UTIL_REQUIRE_PROGS(TOUCH, touch)
  UTIL_REQUIRE_PROGS(TR, tr)
  UTIL_REQUIRE_PROGS(UNAME, uname)
-  UTIL_REQUIRE_PROGS(UNIQ, uniq)
  UTIL_REQUIRE_PROGS(WC, wc)
  UTIL_REQUIRE_PROGS(XARGS, xargs)

  # Then required tools that require some special treatment.
-  UTIL_REQUIRE_SPECIAL(AWK, [AC_PROG_AWK])
  UTIL_REQUIRE_SPECIAL(GREP, [AC_PROG_GREP])
  UTIL_REQUIRE_SPECIAL(EGREP, [AC_PROG_EGREP])
  UTIL_REQUIRE_SPECIAL(FGREP, [AC_PROG_FGREP])
  UTIL_REQUIRE_SPECIAL(SED, [AC_PROG_SED])

+  # Optional tools, we can do without them
+  UTIL_LOOKUP_PROGS(DF, df)
+  UTIL_LOOKUP_PROGS(NICE, nice)
+  UTIL_LOOKUP_PROGS(READLINK, greadlink readlink)
+
+  # These are only needed on some platforms
+  UTIL_LOOKUP_PROGS(PATHTOOL, cygpath wslpath)
+  UTIL_LOOKUP_PROGS(LSB_RELEASE, lsb_release)
+  UTIL_LOOKUP_PROGS(CMD, cmd.exe, $PATH:/cygdrive/c/windows/system32:/mnt/c/windows/system32:/c/windows/system32)
+
+  # For compare.sh only
+  UTIL_LOOKUP_PROGS(CMP, cmp)
+  UTIL_LOOKUP_PROGS(UNIQ, uniq)
+
  # Always force rm.
  RM="$RM -f"
-
-  # pwd behaves differently on various platforms and some don't support the -L flag.
-  # Always use the bash builtin pwd to get uniform behavior.
-  THEPWDCMD=pwd
-
-  # These are not required on all platforms
-  UTIL_PATH_PROGS(CYGPATH, cygpath)
-  UTIL_PATH_PROGS(WSLPATH, wslpath)
-  UTIL_PATH_PROGS(DF, df)
-  UTIL_PATH_PROGS(CPIO, [cpio bsdcpio])
-  UTIL_PATH_PROGS(NICE, nice)
-
-  UTIL_PATH_PROGS(LSB_RELEASE, lsb_release)
-  UTIL_PATH_PROGS(CMD, cmd.exe, $PATH /cygdrive/c/Windows/System32 /mnt/c/Windows/System32)
 ])

 ###############################################################################
@@ -131,10 +128,14 @@ AC_DEFUN([BASIC_CHECK_MAKE_VERSION],
        if test "x$OPENJDK_BUILD_OS" = "xwindows"; then
          if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then
            MAKE_EXPECTED_ENV='cygwin'
-          elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then
+          elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys2"; then
            MAKE_EXPECTED_ENV='msys'
-          elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
-            MAKE_EXPECTED_ENV='x86_64-.*-linux-gnu'
+          elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl1" || test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl2"; then
+            if test "x$OPENJDK_BUILD_CPU" = "xaarch64"; then
+              MAKE_EXPECTED_ENV='aarch64-.*-linux-gnu'
+            else
+              MAKE_EXPECTED_ENV='x86_64-.*-linux-gnu'
+            fi
          else
            AC_MSG_ERROR([Unknown Windows environment])
          fi
@@ -186,14 +187,14 @@ AC_DEFUN([BASIC_CHECK_MAKE_OUTPUT_SYNC],
 # Goes looking for a usable version of GNU make.
 AC_DEFUN([BASIC_CHECK_GNU_MAKE],
 [
-  UTIL_SETUP_TOOL([MAKE],
+  UTIL_SETUP_TOOL(MAKE,
  [
    # Try our hardest to locate a correct version of GNU make
-    AC_PATH_PROGS(CHECK_GMAKE, gmake)
+    UTIL_LOOKUP_PROGS(CHECK_GMAKE, gmake)
    BASIC_CHECK_MAKE_VERSION("$CHECK_GMAKE", [gmake in PATH])

    if test "x$FOUND_MAKE" = x; then
-      AC_PATH_PROGS(CHECK_MAKE, make)
+      UTIL_LOOKUP_PROGS(CHECK_MAKE, make)
      BASIC_CHECK_MAKE_VERSION("$CHECK_MAKE", [make in PATH])
    fi

@@ -202,10 +203,10 @@ AC_DEFUN([BASIC_CHECK_GNU_MAKE],
        # We have a toolchain path, check that as well before giving up.
        OLD_PATH=$PATH
        PATH=$TOOLCHAIN_PATH:$PATH
-        AC_PATH_PROGS(CHECK_TOOLSDIR_GMAKE, gmake)
+        UTIL_LOOKUP_PROGS(CHECK_TOOLSDIR_GMAKE, gmake)
        BASIC_CHECK_MAKE_VERSION("$CHECK_TOOLSDIR_GMAKE", [gmake in tools-dir])
        if test "x$FOUND_MAKE" = x; then
-          AC_PATH_PROGS(CHECK_TOOLSDIR_MAKE, make)
+          UTIL_LOOKUP_PROGS(CHECK_TOOLSDIR_MAKE, make)
          BASIC_CHECK_MAKE_VERSION("$CHECK_TOOLSDIR_MAKE", [make in tools-dir])
        fi
        PATH=$OLD_PATH
@@ -335,24 +336,17 @@ AC_DEFUN_ONCE([BASIC_SETUP_COMPLEX_TOOLS],

  # Non-required basic tools

-  UTIL_PATH_PROGS(LDD, ldd)
-  if test "x$LDD" = "x"; then
-    # List shared lib dependencies is used for
-    # debug output and checking for forbidden dependencies.
-    # We can build without it.
-    LDD="true"
-  fi
-  UTIL_PATH_PROGS(READELF, [greadelf readelf])
-  UTIL_PATH_PROGS(DOT, dot)
-  UTIL_PATH_PROGS(HG, hg)
-  UTIL_PATH_PROGS(GIT, git)
-  UTIL_PATH_PROGS(STAT, stat)
-  UTIL_PATH_PROGS(TIME, time)
-  UTIL_PATH_PROGS(FLOCK, flock)
+  UTIL_LOOKUP_PROGS(READELF, greadelf readelf)
+  UTIL_LOOKUP_PROGS(DOT, dot)
+  UTIL_LOOKUP_PROGS(HG, hg)
+  UTIL_LOOKUP_PROGS(GIT, git)
+  UTIL_LOOKUP_PROGS(STAT, stat)
+  UTIL_LOOKUP_PROGS(TIME, time)
+  UTIL_LOOKUP_PROGS(FLOCK, flock)
  # Dtrace is usually found in /usr/sbin, but that directory may not
  # be in the user path.
-  UTIL_PATH_PROGS(DTRACE, dtrace, $PATH:/usr/sbin)
-  UTIL_PATH_PROGS(PATCH, [gpatch patch])
+  UTIL_LOOKUP_PROGS(DTRACE, dtrace, $PATH:/usr/sbin)
+  UTIL_LOOKUP_PROGS(PATCH, gpatch patch)
  # Check if it's GNU time
  IS_GNU_TIME=`$TIME --version 2>&1 | $GREP 'GNU time'`
  if test "x$IS_GNU_TIME" != x; then
@@ -366,7 +360,7 @@ AC_DEFUN_ONCE([BASIC_SETUP_COMPLEX_TOOLS],
    UTIL_REQUIRE_PROGS(DSYMUTIL, dsymutil)
    UTIL_REQUIRE_PROGS(MIG, mig)
    UTIL_REQUIRE_PROGS(XATTR, xattr)
-    UTIL_PATH_PROGS(CODESIGN, codesign)
+    UTIL_LOOKUP_PROGS(CODESIGN, codesign)

    if test "x$CODESIGN" != "x"; then
      # Check for user provided code signing identity.
@@ -407,7 +401,7 @@ AC_DEFUN_ONCE([BASIC_SETUP_COMPLEX_TOOLS],
    UTIL_REQUIRE_PROGS(SETFILE, SetFile)
  fi
  if ! test "x$OPENJDK_TARGET_OS" = "xwindows"; then
-    UTIL_REQUIRE_BUILTIN_PROGS(ULIMIT, ulimit)
+    UTIL_REQUIRE_PROGS(ULIMIT, ulimit)
  fi
 ])

@@ -453,7 +447,7 @@ AC_DEFUN_ONCE([BASIC_CHECK_BASH_OPTIONS],
 #
 AC_DEFUN_ONCE([BASIC_SETUP_PANDOC],
 [
-  UTIL_PATH_PROGS(PANDOC, pandoc)
+  UTIL_LOOKUP_PROGS(PANDOC, pandoc)

  PANDOC_MARKDOWN_FLAG="markdown"
  if test -n "$PANDOC"; then
--- a/make/autoconf/basic_windows.m4
+++ b/make/autoconf/basic_windows.m4
@@ -24,97 +24,160 @@
 #

 # Setup basic configuration paths, and platform-specific stuff related to PATHs.
-AC_DEFUN([BASIC_CHECK_PATHS_WINDOWS],
+AC_DEFUN([BASIC_SETUP_PATHS_WINDOWS],
 [
-  SRC_ROOT_LENGTH=`$THEPWDCMD -L|$WC -m`
-  if test $SRC_ROOT_LENGTH -gt 100; then
-    AC_MSG_ERROR([Your base path is too long. It is $SRC_ROOT_LENGTH characters long, but only 100 is supported])
+  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
+    # Clarify if it is wsl1 or wsl2, and use that as OS_ENV from this point forward
+    $PATHTOOL -w / > /dev/null 2>&1
+    if test $? -ne 0; then
+      # Without Windows access to our root, it's definitely WSL1
+      OPENJDK_BUILD_OS_ENV=windows.wsl1
+    else
+      # This test is not guaranteed, but there is no documented way of
+      # distinguishing between WSL1 and WSL2. Assume only WSL2 has WSL_INTEROP
+      # in /run/WSL
+      if test -d "/run/WSL" ; then
+        OPENJDK_BUILD_OS_ENV=windows.wsl2
+      else
+        OPENJDK_BUILD_OS_ENV=windows.wsl1
+      fi
+    fi
+    # This is a bit silly since we really don't have a target env as such,
+    # but do it to keep consistency.
+    OPENJDK_TARGET_OS_ENV=$OPENJDK_BUILD_OS_ENV
  fi

+  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys2"; then
+    # Must be done prior to calling any commands to avoid mangling of command line
+    export MSYS2_ARG_CONV_EXCL="*"
+  fi
+
+  AC_MSG_CHECKING([Windows environment type])
+  WINENV_VENDOR=${OPENJDK_BUILD_OS_ENV#windows.}
+  AC_MSG_RESULT([$WINENV_VENDOR])
+
+  if test "x$WINENV_VENDOR" = x; then
+    AC_MSG_ERROR([Unknown Windows environment. Neither cygwin, msys2, wsl1 nor wsl2 was detected.])
+  fi
+
+  if test "x$PATHTOOL" = x; then
+    AC_MSG_ERROR([Incorrect $WINENV_VENDOR installation. Neither cygpath nor wslpath was found])
+  fi
+
+  if test "x$CMD" = x; then
+    AC_MSG_ERROR([Incorrect Windows/$WINENV_VENDOR setup. Could not locate cmd.exe])
+  fi
+
+  AC_MSG_CHECKING([$WINENV_VENDOR drive prefix])
+  WINENV_PREFIX=`$PATHTOOL -u c:/ | $SED -e 's!/c/!!'`
+  AC_MSG_RESULT(['$WINENV_PREFIX'])
+  AC_SUBST(WINENV_PREFIX)
+
+  AC_MSG_CHECKING([$WINENV_VENDOR root directory as Windows path])
+  if test "x$OPENJDK_BUILD_OS_ENV" != "xwindows.wsl1"; then
+    WINENV_ROOT=`$PATHTOOL -w / 2> /dev/null`
+    # msys2 has a trailing backslash; strip it
+    WINENV_ROOT=${WINENV_ROOT%\\}
+  else
+    WINENV_ROOT='[[unavailable]]'
+  fi
+  AC_MSG_RESULT(['$WINENV_ROOT'])
+  AC_SUBST(WINENV_ROOT)
+
+  AC_MSG_CHECKING([$WINENV_VENDOR temp directory])
+  WINENV_TEMP_DIR=$($PATHTOOL -u $($CMD /q /c echo %TEMP% 2> /dev/null) | $TR -d '\r\n')
+  AC_MSG_RESULT([$WINENV_TEMP_DIR])
+
+  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl2"; then
+    # Don't trust the current directory for WSL2, but change to an OK temp dir
+    cd "$WINENV_TEMP_DIR"
+    # Bring along confdefs.h or autoconf gets all confused
+    cp "$CONFIGURE_START_DIR/confdefs.h" "$WINENV_TEMP_DIR"
+  fi
+
+  AC_MSG_CHECKING([$WINENV_VENDOR release])
+  WINENV_UNAME_RELEASE=`$UNAME -r`
+  AC_MSG_RESULT([$WINENV_UNAME_RELEASE])
+
+  AC_MSG_CHECKING([$WINENV_VENDOR version])
+  WINENV_UNAME_VERSION=`$UNAME -v`
+  AC_MSG_RESULT([$WINENV_UNAME_VERSION])
+
+  WINENV_VERSION="$WINENV_UNAME_RELEASE, $WINENV_UNAME_VERSION"
+
  AC_MSG_CHECKING([Windows version])
+
+  # We must change directory to one guaranteed to work, otherwise WSL1
+  # can complain (since it does not have a WINENV_ROOT so it can't access
+  # unix-style paths from Windows.
  # Additional [] needed to keep m4 from mangling shell constructs.
-  [ WINDOWS_VERSION=`$CMD /c ver.exe | $EGREP -o '([0-9]+\.)+[0-9]+'` ]
+  [ WINDOWS_VERSION=`cd $WINENV_TEMP_DIR && $CMD /c ver | $EGREP -o '([0-9]+\.)+[0-9]+'` ]
  AC_MSG_RESULT([$WINDOWS_VERSION])

+  # Additional handling per specific env
  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then
-    AC_MSG_CHECKING([cygwin release])
-    CYGWIN_RELEASE=`$UNAME -r`
-    AC_MSG_RESULT([$CYGWIN_RELEASE])
-
-    AC_MSG_CHECKING([cygwin version])
-    CYGWIN_VERSION=`$UNAME -v`
-    AC_MSG_RESULT([$CYGWIN_VERSION])
-
    # Additional [] needed to keep m4 from mangling shell constructs.
-    [ CYGWIN_VERSION_OLD=`$ECHO $CYGWIN_RELEASE | $GREP -e '^1\.[0-6]'` ]
+    [ CYGWIN_VERSION_OLD=`$ECHO $WINENV_UNAME_RELEASE | $GREP -e '^1\.[0-6]'` ]
    if test "x$CYGWIN_VERSION_OLD" != x; then
      AC_MSG_NOTICE([Your cygwin is too old. You are running $CYGWIN_RELEASE, but at least cygwin 1.7 is required. Please upgrade.])
      AC_MSG_ERROR([Cannot continue])
    fi
-
-    WINDOWS_ENV_VENDOR='cygwin'
-    WINDOWS_ENV_VERSION="$CYGWIN_RELEASE, $CYGWIN_VERSION"
-
-    if test "x$CYGPATH" = x; then
-      AC_MSG_ERROR([Something is wrong with your cygwin installation since I cannot find cygpath.exe in your path])
+    if test "x$LDD" = x; then
+      AC_MSG_ERROR([ldd is missing, which is needed on cygwin])
    fi
-    AC_MSG_CHECKING([cygwin root directory as unix-style path])
-    # The cmd output ends with Windows line endings (CR/LF)
-    cygwin_winpath_root=`cd / ; cmd /c cd | $TR -d '\r\n'`
-    # Force cygpath to report the proper root by including a trailing space, and then stripping it off again.
-    CYGWIN_ROOT_PATH=`$CYGPATH -u "$cygwin_winpath_root " | $CUT -f 1 -d " "`
-    AC_MSG_RESULT([$CYGWIN_ROOT_PATH])
-    WINDOWS_ENV_ROOT_PATH="$CYGWIN_ROOT_PATH"
-    test_cygdrive_prefix=`$ECHO $CYGWIN_ROOT_PATH | $GREP ^/cygdrive/`
-    if test "x$test_cygdrive_prefix" = x; then
-      AC_MSG_ERROR([Your cygdrive prefix is not /cygdrive. This is currently not supported. Change with mount -c.])
+    WINENV_MARKER_DLL=cygwin1.dll
+  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys2"; then
+    if test "x$LDD" = x; then
+      AC_MSG_ERROR([ldd is missing, which is needed on msys2])
    fi
-  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then
-    AC_MSG_CHECKING([msys release])
-    MSYS_RELEASE=`$UNAME -r`
-    AC_MSG_RESULT([$MSYS_RELEASE])
-
-    AC_MSG_CHECKING([msys version])
-    MSYS_VERSION=`$UNAME -v`
-    AC_MSG_RESULT([$MSYS_VERSION])
-
-    WINDOWS_ENV_VENDOR='msys'
-    WINDOWS_ENV_VERSION="$MSYS_RELEASE, $MSYS_VERSION"
-
-    AC_MSG_CHECKING([msys root directory as unix-style path])
-    # The cmd output ends with Windows line endings (CR/LF), the grep command will strip that away
-    MSYS_ROOT_PATH=`cd / ; cmd /c cd | $GREP ".*"`
-    UTIL_REWRITE_AS_UNIX_PATH(MSYS_ROOT_PATH)
-    AC_MSG_RESULT([$MSYS_ROOT_PATH])
-    WINDOWS_ENV_ROOT_PATH="$MSYS_ROOT_PATH"
-  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
-
-    AC_MSG_CHECKING([WSL kernel version])
-    WSL_KERNEL_VERSION=`$UNAME -v`
-    AC_MSG_RESULT([$WSL_KERNEL_VERSION])
-
-    AC_MSG_CHECKING([WSL kernel release])
-    WSL_KERNEL_RELEASE=`$UNAME -r`
-    AC_MSG_RESULT([$WSL_KERNEL_RELEASE])
-
-    AC_MSG_CHECKING([WSL distribution])
+    WINENV_MARKER_DLL=msys-2.0.dll
+  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl1" || test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl2"; then
+    AC_MSG_CHECKING([wsl distribution])
    WSL_DISTRIBUTION=`$LSB_RELEASE -d | sed 's/Description:\t//'`
    AC_MSG_RESULT([$WSL_DISTRIBUTION])

-    WINDOWS_ENV_VENDOR='wsl'
-    WINDOWS_ENV_VERSION="$WSL_KERNEL_RELEASE, $WSL_KERNEL_VERSION ($WSL_DISTRIBUTION)"
-  else
-    AC_MSG_ERROR([Unknown Windows environment. Neither cygwin, msys, nor wsl was detected.])
+    WINENV_VERSION="$WINENV_VERSION ($WSL_DISTRIBUTION)"
+
+    # Tell WSL to automatically translate the PATH variable
+    export WSLENV=PATH/l
  fi

-  # Test if windows or unix (cygwin/msys) find is first in path.
+  # Chicken and egg: FIXPATH is needed for UTIL_FIXUP_PATH to work. So for the
+  # first run we use the auto-detect abilities of fixpath.sh.
+  FIXPATH_DIR="$TOPDIR/make/scripts"
+  FIXPATH="$BASH $FIXPATH_DIR/fixpath.sh exec"
+  FIXPATH_BASE="$BASH $FIXPATH_DIR/fixpath.sh"
+  FIXPATH_SAVED_PATH="$PATH"
+  UTIL_FIXUP_PATH(FIXPATH_DIR)
+
+  # Now we can use FIXPATH_DIR to rewrite path to fixpath.sh properly.
+  if test "x$WINENV_PREFIX" = x; then
+    # On msys the prefix is empty, but we need to pass something to have the
+    # fixpath.sh options parser happy.
+    WINENV_PREFIX_ARG="NONE"
+  else
+    WINENV_PREFIX_ARG="$WINENV_PREFIX"
+  fi
+  FIXPATH_ARGS="-e $PATHTOOL -p $WINENV_PREFIX_ARG -r ${WINENV_ROOT//\\/\\\\}  -t $WINENV_TEMP_DIR -c $CMD -q"
+  FIXPATH_BASE="$BASH $FIXPATH_DIR/fixpath.sh $FIXPATH_ARGS"
+  FIXPATH="$FIXPATH_BASE exec"
+
+  AC_SUBST(FIXPATH_BASE)
+  AC_SUBST(FIXPATH)
+
+  SRC_ROOT_LENGTH=`$ECHO "$TOPDIR" | $WC -m`
+  if test $SRC_ROOT_LENGTH -gt 100; then
+    AC_MSG_ERROR([Your base path is too long. It is $SRC_ROOT_LENGTH characters long, but only 100 is supported])
+  fi
+
+  # Test if windows or unix "find" is first in path.
  AC_MSG_CHECKING([what kind of 'find' is first on the PATH])
  FIND_BINARY_OUTPUT=`find --version 2>&1`
  if test "x`echo $FIND_BINARY_OUTPUT | $GREP GNU`" != x; then
    AC_MSG_RESULT([unix style])
  elif test "x`echo $FIND_BINARY_OUTPUT | $GREP FIND`" != x; then
    AC_MSG_RESULT([Windows])
-    AC_MSG_NOTICE([Your path contains Windows tools (C:\Windows\system32) before your unix (cygwin or msys) tools.])
+    AC_MSG_NOTICE([Your path contains Windows tools (C:\Windows\system32) before your unix tools.])
    AC_MSG_NOTICE([This will not work. Please correct and make sure /usr/bin (or similar) is first in path.])
    AC_MSG_ERROR([Cannot continue])
  else
@@ -123,73 +186,39 @@ AC_DEFUN([BASIC_CHECK_PATHS_WINDOWS],
  fi
 ])

-AC_DEFUN_ONCE([BASIC_COMPILE_FIXPATH],
+# Verify that the directory is usable on Windows
+AC_DEFUN([BASIC_WINDOWS_VERIFY_DIR],
 [
-  # When using cygwin or msys, we need a wrapper binary that renames
-  # /cygdrive/c/ arguments into c:/ arguments and peeks into
-  # @files and rewrites these too! This wrapper binary is
-  # called fixpath.
-  FIXPATH=
-  if test "x$OPENJDK_BUILD_OS" = xwindows; then
-    AC_MSG_CHECKING([if fixpath can be created])
-    FIXPATH_SRC="$TOPDIR/make/src/native/fixpath.c"
-    FIXPATH_BIN="$CONFIGURESUPPORT_OUTPUTDIR/bin/fixpath.exe"
-    FIXPATH_DIR="$CONFIGURESUPPORT_OUTPUTDIR/fixpath"
-    if test "x$OPENJDK_BUILD_OS_ENV" = xwindows.cygwin; then
-      # Important to keep the .exe suffix on Cygwin for Hotspot makefiles
-      FIXPATH="$FIXPATH_BIN -c"
-    elif test "x$OPENJDK_BUILD_OS_ENV" = xwindows.msys; then
-      # Take all collected prefixes and turn them into a -m/c/foo@/c/bar@... command line
-      # @ was chosen as separator to minimize risk of other tools messing around with it
-      all_unique_prefixes=`echo "${all_fixpath_prefixes@<:@@@:>@}" \
-          | tr ' ' '\n' | $GREP '^/./' | $SORT | $UNIQ`
-      fixpath_argument_list=`echo $all_unique_prefixes  | tr ' ' '@'`
-      FIXPATH="$FIXPATH_BIN -m$fixpath_argument_list"
-    elif test "x$OPENJDK_BUILD_OS_ENV" = xwindows.wsl; then
-      FIXPATH="$FIXPATH_BIN -w"
+  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl1"; then
+    OUTPUTDIR_WIN=`$FIXPATH_BASE print $1`
+    if test "x$OUTPUTDIR_WIN" = x; then
+      AC_MSG_NOTICE([For wsl1, the $2 dir must be located on a Windows drive. Please see doc/building.md for details.])
+      AC_MSG_ERROR([Cannot continue])
    fi
-    FIXPATH_SRC_W="$FIXPATH_SRC"
-    FIXPATH_BIN_W="$FIXPATH_BIN"
-    $RM -rf $FIXPATH_BIN $FIXPATH_DIR
-    $MKDIR -p $FIXPATH_DIR $CONFIGURESUPPORT_OUTPUTDIR/bin
-    UTIL_REWRITE_AS_WINDOWS_MIXED_PATH([FIXPATH_SRC_W])
-    UTIL_REWRITE_AS_WINDOWS_MIXED_PATH([FIXPATH_BIN_W])
-    cd $FIXPATH_DIR
-    $CC $FIXPATH_SRC_W -Fe$FIXPATH_BIN_W > $FIXPATH_DIR/fixpath1.log 2>&1
-    cd $CONFIGURE_START_DIR
-
-    if test ! -x $FIXPATH_BIN; then
-      AC_MSG_RESULT([no])
-      cat $FIXPATH_DIR/fixpath1.log
-      AC_MSG_ERROR([Could not create $FIXPATH_BIN])
-    fi
-    AC_MSG_RESULT([yes])
-
-    if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl"; then
-      OLD_WSLENV="$WSLENV"
-      WSLENV=`$ECHO $WSLENV | $SED 's/PATH\/l://'`
-      UTIL_APPEND_TO_PATH(WSLENV, "FIXPATH_PATH")
-      export WSLENV
-      export FIXPATH_PATH=$VS_PATH_WINDOWS
-      AC_MSG_NOTICE([FIXPATH_PATH is $FIXPATH_PATH])
-      AC_MSG_NOTICE([Rewriting WSLENV from $OLD_WSLENV to $WSLENV])
-    fi
-
-    AC_MSG_CHECKING([if fixpath.exe works])
-    cd $FIXPATH_DIR
-    $FIXPATH $CC $FIXPATH_SRC -Fe$FIXPATH_DIR/fixpath2.exe \
-        > $FIXPATH_DIR/fixpath2.log 2>&1
-    cd $CONFIGURE_START_DIR
-    if test ! -x $FIXPATH_DIR/fixpath2.exe; then
-      AC_MSG_RESULT([no])
-      cat $FIXPATH_DIR/fixpath2.log
-      AC_MSG_ERROR([fixpath did not work!])
-    fi
-    AC_MSG_RESULT([yes])
-
-    FIXPATH_DETACH_FLAG="--detach"
  fi
-
-  AC_SUBST(FIXPATH)
-  AC_SUBST(FIXPATH_DETACH_FLAG)
+])
+
+# Create fixpath wrapper
+AC_DEFUN([BASIC_WINDOWS_FINALIZE_FIXPATH],
+[
+  if test "x$OPENJDK_BUILD_OS" = xwindows; then
+    FIXPATH_CMDLINE=". $TOPDIR/make/scripts/fixpath.sh -e $PATHTOOL \
+        -p $WINENV_PREFIX_ARG -r ${WINENV_ROOT//\\/\\\\}  -t $WINENV_TEMP_DIR \
+        -c $CMD -q"
+    $ECHO >  $OUTPUTDIR/fixpath '#!/bin/bash'
+    $ECHO >> $OUTPUTDIR/fixpath export PATH='"[$]PATH:'$PATH'"'
+    $ECHO >> $OUTPUTDIR/fixpath $FIXPATH_CMDLINE '"[$]@"'
+    $CHMOD +x $OUTPUTDIR/fixpath
+    FIXPATH_BASE="$OUTPUTDIR/fixpath"
+    FIXPATH="$FIXPATH_BASE exec"
+  fi
+])
+
+# Platform-specific finalization
+AC_DEFUN([BASIC_WINDOWS_FINALIZE],
+[
+  if test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.wsl2"; then
+    # Change back from temp dir
+    cd $CONFIGURE_START_DIR
+  fi
 ])
--- a/make/autoconf/boot-jdk.m4
+++ b/make/autoconf/boot-jdk.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -63,19 +63,23 @@ AC_DEFUN([BOOTJDK_DO_CHECK],
    # If previous step claimed to have found a JDK, check it to see if it seems to be valid.
    if test "x$BOOT_JDK_FOUND" = xmaybe; then
      # Do we have a bin/java?
-      if test ! -x "$BOOT_JDK/bin/java$EXE_SUFFIX"; then
+      if test ! -x "$BOOT_JDK/bin/java" && test ! -x "$BOOT_JDK/bin/java.exe"; then
        AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/java; ignoring])
        BOOT_JDK_FOUND=no
      else
        # Do we have a bin/javac?
-        if test ! -x "$BOOT_JDK/bin/javac$EXE_SUFFIX"; then
+        if test ! -x "$BOOT_JDK/bin/javac" && test ! -x "$BOOT_JDK/bin/javac.exe"; then
          AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK did not contain bin/javac; ignoring])
          AC_MSG_NOTICE([(This might be an JRE instead of an JDK)])
          BOOT_JDK_FOUND=no
        else
          # Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
+          java_to_test="$BOOT_JDK/bin/java"
+          UTIL_FIXUP_EXECUTABLE(java_to_test)
+          BOOT_JDK_VERSION_OUTPUT=`$java_to_test $USER_BOOT_JDK_OPTIONS -version 2>&1`
          # Additional [] needed to keep m4 from mangling shell constructs.
-          [ BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java$EXE_SUFFIX" $USER_BOOT_JDK_OPTIONS -version 2>&1 | $AWK '/version \"[0-9a-zA-Z\._\-]+\"/{print $ 0; exit;}'` ]
+          [ BOOT_JDK_VERSION=`echo $BOOT_JDK_VERSION_OUTPUT | $AWK '/version "[0-9a-zA-Z\._\-]+"/ {print $ 0; exit;}'` ]
+
          if [ [[ "$BOOT_JDK_VERSION" =~ "Picked up" ]] ]; then
            AC_MSG_NOTICE([You have _JAVA_OPTIONS or JAVA_TOOL_OPTIONS set. This can mess up the build. Please use --with-boot-jdk-jvmargs instead.])
            AC_MSG_NOTICE([Java reports: "$BOOT_JDK_VERSION".])
@@ -91,7 +95,12 @@ AC_DEFUN([BOOTJDK_DO_CHECK],
          # Extra M4 quote needed to protect [] in grep expression.
          [FOUND_CORRECT_VERSION=`$ECHO $BOOT_JDK_VERSION \
              | $EGREP "\"(${DEFAULT_ACCEPTABLE_BOOT_VERSIONS// /|})([\.+-].*)?\""`]
-          if test "x$FOUND_CORRECT_VERSION" = x; then
+
+          if test "x$BOOT_JDK_VERSION" = x; then
+            AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK is not a working JDK; ignoring])
+            AC_MSG_NOTICE([Output from java -version was: $BOOT_JDK_VERSION_OUTPUT])
+            BOOT_JDK_FOUND=no
+          elif test "x$FOUND_CORRECT_VERSION" = x; then
            AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK is incorrect JDK version ($BOOT_JDK_VERSION); ignoring])
            AC_MSG_NOTICE([(Your Boot JDK version must be one of: $DEFAULT_ACCEPTABLE_BOOT_VERSIONS)])
            BOOT_JDK_FOUND=no
@@ -102,7 +111,9 @@ AC_DEFUN([BOOTJDK_DO_CHECK],
            AC_MSG_CHECKING([for Boot JDK])
            AC_MSG_RESULT([$BOOT_JDK])
            AC_MSG_CHECKING([Boot JDK version])
-            BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java$EXE_SUFFIX" $USER_BOOT_JDK_OPTIONS -version 2>&1 | $TR '\n\r' '  '`
+            BOOT_JDK_VERSION=`$java_to_test $USER_BOOT_JDK_OPTIONS -version 2>&1 | $TR -d '\r'`
+            # This is not a no-op; it will portably convert newline to space
+            BOOT_JDK_VERSION=`$ECHO $BOOT_JDK_VERSION`
            AC_MSG_RESULT([$BOOT_JDK_VERSION])
          fi # end check jdk version
        fi # end check javac
@@ -151,8 +162,8 @@ AC_DEFUN([BOOTJDK_CHECK_JAVA_HOME],
 [
  if test "x$JAVA_HOME" != x; then
    JAVA_HOME_PROCESSED="$JAVA_HOME"
-    UTIL_FIXUP_PATH(JAVA_HOME_PROCESSED)
-    if test ! -d "$JAVA_HOME_PROCESSED"; then
+    UTIL_FIXUP_PATH(JAVA_HOME_PROCESSED, NOFAIL)
+    if test "x$JAVA_HOME_PROCESSED" = x || test ! -d "$JAVA_HOME_PROCESSED"; then
      AC_MSG_NOTICE([Your JAVA_HOME points to a non-existing directory!])
    else
      # Aha, the user has set a JAVA_HOME
@@ -167,8 +178,8 @@ AC_DEFUN([BOOTJDK_CHECK_JAVA_HOME],
 # Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
 AC_DEFUN([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK],
 [
-  AC_PATH_PROG(JAVAC_CHECK, javac)
-  AC_PATH_PROG(JAVA_CHECK, java)
+  UTIL_LOOKUP_PROGS(JAVAC_CHECK, javac, , NOFIXPATH)
+  UTIL_LOOKUP_PROGS(JAVA_CHECK, java, , NOFIXPATH)
  BINARY="$JAVAC_CHECK"
  if test "x$JAVAC_CHECK" = x; then
    BINARY="$JAVA_CHECK"
@@ -207,9 +218,9 @@ AC_DEFUN([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR],
    # First check at user selected default
    BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME()])
    # If that did not work out (e.g. too old), try explicit versions instead
-    BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.9])])
-    BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.8])])
-    BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v 1.7])])
+    for ver in $DEFAULT_ACCEPTABLE_BOOT_VERSIONS ; do
+      BOOTJDK_DO_CHECK([BOOTJDK_CHECK_LIBEXEC_JAVA_HOME([-v $ver])])
+    done
  fi
 ])

@@ -242,8 +253,10 @@ AC_DEFUN([BOOTJDK_FIND_BEST_JDK_IN_WINDOWS_VIRTUAL_DIRECTORY],
 [
  if test "x[$]$1" != x; then
    VIRTUAL_DIR="[$]$1/Java"
-    UTIL_REWRITE_AS_UNIX_PATH(VIRTUAL_DIR)
-    BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY($VIRTUAL_DIR)
+    UTIL_FIXUP_PATH(VIRTUAL_DIR, NOFAIL)
+    if test "x$VIRTUAL_DIR" != x; then
+      BOOTJDK_FIND_BEST_JDK_IN_DIRECTORY($VIRTUAL_DIR)
+    fi
  fi
 ])

@@ -270,16 +283,17 @@ AC_DEFUN([BOOTJDK_CHECK_WELL_KNOWN_LOCATIONS],
 AC_DEFUN([BOOTJDK_CHECK_TOOL_IN_BOOTJDK],
 [
  # Use user overridden value if available, otherwise locate tool in the Boot JDK.
-  UTIL_SETUP_TOOL($1,
+  UTIL_REQUIRE_SPECIAL($1,
    [
-      AC_MSG_CHECKING([for $2 in Boot JDK])
+      AC_MSG_CHECKING([for $2 [[Boot JDK]]])
      $1=$BOOT_JDK/bin/$2
-      if test ! -x [$]$1; then
+      if test ! -x [$]$1 && test ! -x [$]$1.exe; then
        AC_MSG_RESULT(not found)
        AC_MSG_NOTICE([Your Boot JDK seems broken. This might be fixed by explicitly setting --with-boot-jdk])
        AC_MSG_ERROR([Could not find $2 in the Boot JDK])
      fi
-      AC_MSG_RESULT(ok)
+      AC_MSG_RESULT(\[$]BOOT_JDK/bin/$2)
+      UTIL_FIXUP_EXECUTABLE($1)
      AC_SUBST($1)
    ])
 ])
@@ -313,12 +327,12 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
    AC_MSG_ERROR([The path given by --with-boot-jdk does not contain a valid Boot JDK])
  fi

-  # Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
-  BOOTJDK_DO_CHECK([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR])
-
  # Test: Is $JAVA_HOME set?
  BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_HOME])

+  # Test: On MacOS X, can we find a boot jdk using /usr/libexec/java_home?
+  BOOTJDK_DO_CHECK([BOOTJDK_CHECK_MACOSX_JAVA_LOCATOR])
+
  # Test: Is there a java or javac in the PATH, which is a symlink to the JDK?
  BOOTJDK_DO_CHECK([BOOTJDK_CHECK_JAVA_IN_PATH_IS_SYMLINK])

@@ -336,11 +350,10 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
  AC_SUBST(BOOT_JDK)

  # Setup tools from the Boot JDK.
-  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVA, java$EXE_SUFFIX)
-  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAC, javac$EXE_SUFFIX)
-  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVADOC, javadoc$EXE_SUFFIX)
-  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAR, jar$EXE_SUFFIX)
-  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JARSIGNER, jarsigner$EXE_SUFFIX)
+  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVA, java)
+  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVAC, javac)
+  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAVADOC, javadoc)
+  BOOTJDK_CHECK_TOOL_IN_BOOTJDK(JAR, jar)

  # Finally, set some other options...

@@ -353,7 +366,7 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
  AC_SUBST(BOOT_JDK_SOURCETARGET)

  # Check if the boot jdk is 32 or 64 bit
-  if "$JAVA" -version 2>&1 | $GREP -q "64-Bit"; then
+  if $JAVA -version 2>&1 | $GREP -q "64-Bit"; then
    BOOT_JDK_BITS="64"
  else
    BOOT_JDK_BITS="32"
@@ -368,7 +381,7 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],

  if test "x$boot_jdk_cds_args" != x; then
    # Try creating a CDS archive
-    "$JAVA" $boot_jdk_cds_args -Xshare:dump > /dev/null 2>&1
+    $JAVA $boot_jdk_cds_args -Xshare:dump > /dev/null 2>&1
    if test $? -eq 0; then
      BOOTJDK_USE_LOCAL_CDS=true
      AC_MSG_RESULT([yes, created])
@@ -516,7 +529,7 @@ AC_DEFUN([BOOTJDK_CHECK_BUILD_JDK],
      else
        # Oh, this is looking good! We probably have found a proper JDK. Is it the correct version?
        # Additional [] needed to keep m4 from mangling shell constructs.
-        [ BUILD_JDK_VERSION=`"$BUILD_JDK/bin/java" -version 2>&1 | $AWK '/version \"[0-9a-zA-Z\._\-]+\"/{print $ 0; exit;}'` ]
+        [ BUILD_JDK_VERSION=`"$BUILD_JDK/bin/java" -version 2>&1 | $AWK '/version "[0-9a-zA-Z\._\-]+"/ {print $ 0; exit;}'` ]

        # Extra M4 quote needed to protect [] in grep expression.
        [FOUND_CORRECT_VERSION=`echo $BUILD_JDK_VERSION | $EGREP "\"$VERSION_FEATURE([\.+-].*)?\""`]
@@ -574,8 +587,12 @@ AC_DEFUN([BOOTJDK_SETUP_BUILD_JDK],
    fi
  fi

+  # Since these tools do not yet exist, we cannot use UTIL_FIXUP_EXECUTABLE to
+  # detect the need of fixpath
  JMOD="$BUILD_JDK/bin/jmod"
+  UTIL_ADD_FIXPATH(JMOD)
  JLINK="$BUILD_JDK/bin/jlink"
+  UTIL_ADD_FIXPATH(JLINK)
  AC_SUBST(JMOD)
  AC_SUBST(JLINK)

@@ -589,3 +606,28 @@ AC_DEFUN([BOOTJDK_SETUP_BUILD_JDK],
  AC_SUBST(BUILD_JDK)
  AC_SUBST(EXTERNAL_BUILDJDK)
 ])
+
+# The docs-reference JDK is used to run javadoc for the docs-reference targets.
+# If not set, the reference docs will be built using the interim javadoc.
+AC_DEFUN([BOOTJDK_SETUP_DOCS_REFERENCE_JDK],
+[
+  AC_ARG_WITH(docs-reference-jdk, [AS_HELP_STRING([--with-docs-reference-jdk],
+      [path to JDK to use for building the reference documentation])])
+
+  AC_MSG_CHECKING([for docs-reference JDK])
+  if test "x$with_docs_reference_jdk" != "x"; then
+    DOCS_REFERENCE_JDK="$with_docs_reference_jdk"
+    AC_MSG_RESULT([$DOCS_REFERENCE_JDK])
+    DOCS_REFERENCE_JAVADOC="$DOCS_REFERENCE_JDK/bin/javadoc"
+    if test ! -x "$DOCS_REFERENCE_JAVADOC"; then
+      AC_MSG_ERROR([docs-reference JDK found at $DOCS_REFERENCE_JDK did not contain bin/javadoc])
+    fi
+    UTIL_FIXUP_EXECUTABLE(DOCS_REFERENCE_JAVADOC)
+  else
+    AC_MSG_RESULT([no, using interim javadoc for the docs-reference targets])
+    # By leaving this empty, Docs.gmk will revert to the default interim javadoc
+    DOCS_REFERENCE_JAVADOC=
+  fi
+
+  AC_SUBST(DOCS_REFERENCE_JAVADOC)
+])
--- a/make/autoconf/bootcycle-spec.gmk.in
+++ b/make/autoconf/bootcycle-spec.gmk.in
@@ -28,14 +28,6 @@
 # First include the real base spec.gmk file
 include @SPEC@

-# Check that the user did not try to specify a different java to use for compiling.
-# On windows we need to account for fixpath being first word.
-ifeq ($(firstword $(JAVA)),$(FIXPATH))
-  JAVA_EXEC_POS=2
-else
-  JAVA_EXEC_POS=1
-endif
-
 # Override specific values to do a boot cycle build

 # Use a different Boot JDK
@@ -47,10 +39,9 @@ OUTPUTDIR:=$(OLD_OUTPUTDIR)/bootcycle-build
 # No spaces in patsubst to avoid leading space in variable
 JAVAC_SERVER_DIR:=$(patsubst $(OLD_OUTPUTDIR)%,$(OUTPUTDIR)%,$(JAVAC_SERVER_DIR))

-JAVA_CMD:=$(BOOT_JDK)/bin/java
-JAVAC_CMD:=$(BOOT_JDK)/bin/javac
-JAR_CMD:=$(BOOT_JDK)/bin/jar
-JARSIGNER_CMD:=$(BOOT_JDK)/bin/jarsigner
+JAVA_CMD := $(FIXPATH) $(BOOT_JDK)/bin/java
+JAVAC_CMD := $(FIXPATH) $(BOOT_JDK)/bin/javac
+JAR_CMD := $(FIXPATH) $(BOOT_JDK)/bin/jar
 # The bootcycle JVM arguments may differ from the original boot jdk.
 JAVA_FLAGS_BIG := @BOOTCYCLE_JVM_ARGS_BIG@
 # Any CDS settings generated for the bootjdk are invalid in the bootcycle build.
@@ -58,5 +49,3 @@ JAVA_FLAGS_BIG := @BOOTCYCLE_JVM_ARGS_BIG@
 # settings for CDS.
 JAVA_FLAGS := $(filter-out -XX:SharedArchiveFile% -Xshare%, $(JAVA_FLAGS))

-# Pandoc cannot be used without the jjs plugin, which was removed with Nashorn.
-ENABLE_PANDOC := false
--- a/make/autoconf/build-aux/config.guess
+++ b/make/autoconf/build-aux/config.guess
@@ -30,6 +30,17 @@
 DIR=`dirname $0`
 OUT=`. $DIR/autoconf-config.guess`

+# Detect C library.
+# Use '-gnu'  suffix on systems that use glibc.
+# Use '-musl' suffix on systems that use the musl libc.
+echo $OUT | grep -- -linux- > /dev/null 2> /dev/null
+if test $? = 0; then
+  libc_vendor=`ldd --version 2>&1 | sed -n '1s/.*\(musl\).*/\1/p'`
+  if [ x"${libc_vendor}" = x"musl" ]; then
+    OUT=`echo $OUT | sed 's/-gnu/-musl/'`
+  fi
+fi
+
 # Test and fix cygwin on x86_64
 echo $OUT | grep 86-pc-cygwin > /dev/null 2> /dev/null
 if test $? != 0; then
@@ -45,11 +56,11 @@ if test $? = 0; then
 fi

 # Test and fix wsl
-echo $OUT | grep x86_64-unknown-linux-gnu > /dev/null 2> /dev/null
+echo $OUT | grep unknown-linux-gnu > /dev/null 2> /dev/null
 if test $? = 0; then
  uname -r | grep -i microsoft > /dev/null 2> /dev/null
  if test $? = 0; then
-    OUT="x86_64-pc-wsl"
+    OUT=`echo $OUT | sed -e 's/unknown-linux-gnu/pc-wsl/'`
  fi
 fi

--- a/make/autoconf/build-aux/config.sub
+++ b/make/autoconf/build-aux/config.sub
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -29,8 +29,19 @@

 DIR=`dirname $0`

+if echo $* | grep linux-musl >/dev/null ; then
+    echo $*
+    exit
+fi
+
 # Allow wsl
-if echo $* | grep x86_64-pc-wsl >/dev/null ; then
+if echo $* | grep pc-wsl >/dev/null ; then
+    echo $*
+    exit
+fi
+
+# Allow msys2
+if echo $* | grep pc-msys >/dev/null ; then
    echo $*
    exit
 fi
@@ -44,7 +55,7 @@ if ! echo $* | grep '^aarch64-' >/dev/null ; then
 fi

 while test $# -gt 0 ; do
-    case $1 in 
+    case $1 in
        -- )   # Stop option processing
            shift; break ;;
        aarch64-* )
--- a/make/autoconf/build-performance.m4
+++ b/make/autoconf/build-performance.m4
@@ -175,7 +175,7 @@ AC_DEFUN([BPERF_SETUP_CCACHE],
  if test "x$TOOLCHAIN_PATH" != x; then
    PATH=$TOOLCHAIN_PATH:$PATH
  fi
-  UTIL_PATH_PROGS(CCACHE, ccache)
+  UTIL_LOOKUP_PROGS(CCACHE, ccache)
  PATH="$OLD_PATH"

  AC_MSG_CHECKING([if ccache is available])
--- a/make/autoconf/buildjdk-spec.gmk.in
+++ b/make/autoconf/buildjdk-spec.gmk.in
@@ -54,11 +54,13 @@ IMAGES_OUTPUTDIR := $(patsubst $(OUTPUTDIR)%,$(BUILDJDK_OUTPUTDIR)%,$(IMAGES_OUT

 OPENJDK_BUILD_CPU_LEGACY := @OPENJDK_BUILD_CPU_LEGACY@
 OPENJDK_BUILD_CPU_LEGACY_LIB := @OPENJDK_BUILD_CPU_LEGACY_LIB@
+OPENJDK_BUILD_LIBC := @OPENJDK_BUILD_LIBC@
 OPENJDK_TARGET_CPU := @OPENJDK_BUILD_CPU@
 OPENJDK_TARGET_CPU_ARCH := @OPENJDK_BUILD_CPU_ARCH@
 OPENJDK_TARGET_CPU_BITS := @OPENJDK_BUILD_CPU_BITS@
 OPENJDK_TARGET_CPU_ENDIAN := @OPENJDK_BUILD_CPU_ENDIAN@
 OPENJDK_TARGET_CPU_LEGACY := @OPENJDK_BUILD_CPU_LEGACY@
+OPENJDK_TARGET_LIBC := @OPENJDK_BUILD_LIBC@
 OPENJDK_TARGET_OS_INCLUDE_SUBDIR := @OPENJDK_BUILD_OS_INCLUDE_SUBDIR@

 HOTSPOT_TARGET_OS := @HOTSPOT_BUILD_OS@
@@ -66,6 +68,7 @@ HOTSPOT_TARGET_OS_TYPE := @HOTSPOT_BUILD_OS_TYPE@
 HOTSPOT_TARGET_CPU := @HOTSPOT_BUILD_CPU@
 HOTSPOT_TARGET_CPU_ARCH := @HOTSPOT_BUILD_CPU_ARCH@
 HOTSPOT_TARGET_CPU_DEFINE := @HOTSPOT_BUILD_CPU_DEFINE@
+HOTSPOT_TARGET_LIBC := @HOTSPOT_BUILD_LIBC@

 CFLAGS_JDKLIB := @OPENJDK_BUILD_CFLAGS_JDKLIB@
 CXXFLAGS_JDKLIB := @OPENJDK_BUILD_CXXFLAGS_JDKLIB@
--- a/make/autoconf/compare.sh.in
+++ b/make/autoconf/compare.sh.in
@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -43,7 +43,7 @@ export CMP="@CMP@"
 export CP="@CP@"
 export CUT="@CUT@"
 export DIFF="@DIFF@"
-export DUMPBIN="@FIXPATH@ @DUMPBIN@"
+export DUMPBIN="@DUMPBIN@"
 export EXPR="@EXPR@"
 export FILE="@FILE@"
 export FIND="@FIND@"
@@ -53,7 +53,6 @@ export LDD="@LDD@"
 export LN="@LN@"
 export MKDIR="@MKDIR@"
 export MV="@MV@"
-export NAWK="@NAWK@"
 export NM="@GNM@"
 export OBJDUMP="@OBJDUMP@"
 export OTOOL="@OTOOL@"
@@ -87,12 +86,10 @@ else
 fi

 if [ "$OPENJDK_TARGET_OS" = "windows" ]; then
-  if [ "$OPENJDK_BUILD_OS_ENV" = "windows.wsl" ]; then
-    export FIXPATH_PATH="@VS_PATH_WINDOWS@"
-    export WSLENV="$WSLENV:FIXPATH_PATH:DEBUG_FIXPATH"
-  else
-    export PATH="@VS_PATH@"
+  if [[ $OPENJDK_BUILD_OS_ENV =~ ^windows.wsl ]]; then
+    export WSLENV=PATH/l
  fi
+  export PATH="$PATH:@TOOLCHAIN_PATH@"
 fi

 export HOTSPOT_BUILD_TIME="@HOTSPOT_BUILD_TIME@"
--- a/make/autoconf/configure
+++ b/make/autoconf/configure
@@ -1,6 +1,6 @@
 #!/bin/bash
 #
-# Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -49,7 +49,7 @@ export LC_ALL=C
 if test "x$CUSTOM_CONFIG_DIR" != x; then
  custom_hook=$CUSTOM_CONFIG_DIR/custom-hook.m4
  if test ! -e $custom_hook; then
-    echo "CUSTOM_CONFIG_DIR not pointing to a proper custom config dir."
+    echo "CUSTOM_CONFIG_DIR ($CUSTOM_CONFIG_DIR) not pointing to a proper custom config dir."
    echo "Error: Cannot continue" 1>&2
    exit 1
  fi
@@ -83,6 +83,7 @@ autoconf_missing_help() {
  BREW="`type -p brew 2> /dev/null`"
  ZYPPER="`type -p zypper 2> /dev/null`"
  CYGWIN="`type -p cygpath 2> /dev/null`"
+  UNAMEOUT="`uname 2> /dev/null`"

  if test "x$ZYPPER" != x; then
    PKGHANDLER_COMMAND="sudo zypper install autoconf"
@@ -92,6 +93,8 @@ autoconf_missing_help() {
    PKGHANDLER_COMMAND="sudo yum install autoconf"
  elif test "x$BREW" != x; then
    PKGHANDLER_COMMAND="brew install autoconf"
+  elif test "x$UNAMEOUT" == xAIX; then
+    echo "You might be able to fix this by installing autoconf from the 'AIX Toolbox for Linux Applications' (or compile it from the sources)."
  elif test "x$CYGWIN" != x; then
    PKGHANDLER_COMMAND="( cd <location of cygwin setup.exe> && cmd /c setup -q -P autoconf )"
  fi
@@ -114,7 +117,7 @@ generate_configure_script() {
    AUTOCONF="`type -p autoconf 2> /dev/null`"
    if test "x$AUTOCONF" = x; then
      echo
-      echo "Autoconf is not found on the PATH, and AUTOCONF is not set."
+      echo "Autoconf is not found on the PATH ($PATH), and AUTOCONF is not set."
      echo "You need autoconf to be able to generate a runnable configure script."
      autoconf_missing_help
      echo "Error: Cannot find autoconf" 1>&2
--- a/make/autoconf/configure.ac
+++ b/make/autoconf/configure.ac
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -106,6 +106,8 @@ BASIC_SETUP_DEVKIT
 # To properly create a configuration name, we need to have the OpenJDK target
 # and options (variants and debug level) parsed.
 BASIC_SETUP_OUTPUT_DIR
+# After we have the output dir we can finalize the fixpath wrapper
+BASIC_WINDOWS_FINALIZE_FIXPATH

 # Must be done before we can call HELP_MSG_MISSING_DEPENDENCY.
 HELP_SETUP_DEPENDENCY_HELP
@@ -142,6 +144,7 @@ JDKVER_SETUP_JDK_VERSION_NUMBERS

 BOOTJDK_SETUP_BOOT_JDK
 BOOTJDK_SETUP_BUILD_JDK
+BOOTJDK_SETUP_DOCS_REFERENCE_JDK

 ###############################################################################
 #
@@ -203,7 +206,8 @@ FLAGS_POST_TOOLCHAIN
 PLATFORM_SETUP_OPENJDK_TARGET_BITS
 PLATFORM_SETUP_OPENJDK_TARGET_ENDIANNESS

-# Configure flags for the tools
+# Configure flags for the tools. Need to know if we should build reproducible.
+JDKOPT_SETUP_REPRODUCIBLE_BUILD
 FLAGS_SETUP_FLAGS

 # Setup debug symbols (need objcopy from the toolchain for that)
@@ -219,9 +223,6 @@ JDKOPT_SETUP_ADDRESS_SANITIZER
 #
 ###############################################################################

-# After we have toolchain, we can compile fixpath. It's needed by the lib checks.
-BASIC_COMPILE_FIXPATH
-
 LIB_DETERMINE_DEPENDENCIES
 LIB_SETUP_LIBRARIES

@@ -242,13 +243,11 @@ HOTSPOT_SETUP_MISC
 #
 ###############################################################################

-JDKOPT_DETECT_INTREE_EC
 JDKOPT_ENABLE_DISABLE_FAILURE_HANDLER
 JDKOPT_ENABLE_DISABLE_GENERATE_CLASSLIST
 JDKOPT_EXCLUDE_TRANSLATIONS
 JDKOPT_ENABLE_DISABLE_MANPAGES
 JDKOPT_ENABLE_DISABLE_CDS_ARCHIVE
-JDKOPT_SETUP_REPRODUCIBLE_BUILD

 ###############################################################################
 #
@@ -295,6 +294,7 @@ BASIC_CHECK_LEFTOVER_OVERRIDDEN
 CONFIG_STATUS="$CONFIGURESUPPORT_OUTPUTDIR/config.status"

 # Create the actual output files. Now the main work of configure is done.
+BASIC_WINDOWS_FINALIZE
 AC_OUTPUT

 # After AC_OUTPUT, we need to do final work
--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -130,14 +130,20 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
  case "${TOOLCHAIN_TYPE}" in
    microsoft)
      DISABLE_WARNING_PREFIX="-wd"
+      BUILD_CC_DISABLE_WARNING_PREFIX="-wd"
      CFLAGS_WARNINGS_ARE_ERRORS="-WX"

      WARNINGS_ENABLE_ALL="-W3"
      DISABLED_WARNINGS="4800"
+      if test "x$TOOLCHAIN_VERSION" = x2017; then
+        # VS2017 incorrectly triggers this warning for constexpr
+        DISABLED_WARNINGS+=" 4307"
+      fi
      ;;

    gcc)
      DISABLE_WARNING_PREFIX="-Wno-"
+      BUILD_CC_DISABLE_WARNING_PREFIX="-Wno-"
      CFLAGS_WARNINGS_ARE_ERRORS="-Werror"

      # Additional warnings that are not activated by -Wall and -Wextra
@@ -149,7 +155,6 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
      WARNINGS_ENABLE_ALL_CXXFLAGS="$WARNINGS_ENABLE_ALL_CFLAGS $WARNINGS_ENABLE_ADDITIONAL_CXX"

      DISABLED_WARNINGS="unused-parameter unused"
-      BUILD_CC_DISABLE_WARNING_PREFIX="-Wno-"
      ;;

    clang)
@@ -163,11 +168,6 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],

      DISABLED_WARNINGS="unknown-warning-option unused-parameter unused"

-      if test "x$OPENJDK_TARGET_OS" = xmacosx; then
-        # missing-method-return-type triggers in JavaNativeFoundation framework
-        DISABLED_WARNINGS="$DISABLED_WARNINGS missing-method-return-type"
-      fi
-
      ;;

    xlc)
@@ -227,8 +227,14 @@ AC_DEFUN([FLAGS_SETUP_OPTIMIZATION],
    # -D_FORTIFY_SOURCE=2 hardening option needs optimization (at least -O1) enabled
    # set for lower O-levels -U_FORTIFY_SOURCE to overwrite previous settings
    if test "x$OPENJDK_TARGET_OS" = xlinux -a "x$DEBUG_LEVEL" = "xfastdebug"; then
-      ENABLE_FORTIFY_CFLAGS="-D_FORTIFY_SOURCE=2"
      DISABLE_FORTIFY_CFLAGS="-U_FORTIFY_SOURCE"
+      # ASan doesn't work well with _FORTIFY_SOURCE
+      # See https://github.com/google/sanitizers/wiki/AddressSanitizer#faq
+      if test "x$ASAN_ENABLED" = xyes; then
+        ENABLE_FORTIFY_CFLAGS="${DISABLE_FORTIFY_CFLAGS}"
+      else
+        ENABLE_FORTIFY_CFLAGS="-D_FORTIFY_SOURCE=2"
+      fi
      C_O_FLAG_HIGHEST_JVM="${C_O_FLAG_HIGHEST_JVM} ${ENABLE_FORTIFY_CFLAGS}"
      C_O_FLAG_HIGHEST="${C_O_FLAG_HIGHEST} ${ENABLE_FORTIFY_CFLAGS}"
      C_O_FLAG_HI="${C_O_FLAG_HI} ${ENABLE_FORTIFY_CFLAGS}"
@@ -554,6 +560,11 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER],
    fi
  fi

+  OS_CFLAGS="$OS_CFLAGS -DLIBC=$OPENJDK_TARGET_LIBC"
+  if test "x$OPENJDK_TARGET_LIBC" = xmusl; then
+    OS_CFLAGS="$OS_CFLAGS -DMUSL_LIBC"
+  fi
+
  # Where does this really belong??
  if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then
    PICFLAG="-fPIC"
@@ -589,25 +600,6 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER],
    fi
  fi

-  # Optional POSIX functionality needed by the JVM
-  #
-  # Check if clock_gettime is available and in which library. This indicates
-  # availability of CLOCK_MONOTONIC for hotspot. But we don't need to link, so
-  # don't let it update LIBS.
-  save_LIBS="$LIBS"
-  AC_SEARCH_LIBS(clock_gettime, rt, [HAS_CLOCK_GETTIME=true], [])
-  if test "x$LIBS" = "x-lrt "; then
-    CLOCK_GETTIME_IN_LIBRT=true
-  fi
-  LIBS="$save_LIBS"
-
-  if test "x$HAS_CLOCK_GETTIME" = "xtrue"; then
-    OS_CFLAGS_JVM="$OS_CFLAGS_JVM -DSUPPORTS_CLOCK_MONOTONIC"
-    if test "x$CLOCK_GETTIME_IN_LIBRT" = "xtrue"; then
-      OS_CFLAGS_JVM="$OS_CFLAGS_JVM -DNEEDS_LIBRT"
-    fi
-  fi
-
  # Extra flags needed when building optional static versions of certain
  # JDK libraries.
  STATIC_LIBS_CFLAGS="-DSTATIC_BUILD=1"
@@ -648,21 +640,17 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
  $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -DARCH='\"$FLAGS_CPU_LEGACY\"' \
      -D$FLAGS_CPU_LEGACY"

-  if test "x$FLAGS_CPU_BITS" = x64; then
-    # -D_LP64=1 is only set on linux and mac. Setting on windows causes diff in
-    # unpack200.exe.
-    if test "x$FLAGS_OS" = xlinux || test "x$FLAGS_OS" = xmacosx; then
-      $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -D_LP64=1"
-    fi
-    if test "x$FLAGS_OS" != xaix; then
-      # xlc on AIX defines _LP64=1 by default and issues a warning if we redefine it.
-      $1_DEFINES_CPU_JVM="${$1_DEFINES_CPU_JVM} -D_LP64=1"
-    fi
+  if test "x$FLAGS_CPU_BITS" = x64 && test "x$FLAGS_OS" != xaix; then
+    # xlc on AIX defines _LP64=1 by default and issues a warning if we redefine it.
+    $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -D_LP64=1"
+    $1_DEFINES_CPU_JVM="${$1_DEFINES_CPU_JVM} -D_LP64=1"
  fi

  # toolchain dependend, per-cpu
  if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
-    if test "x$FLAGS_CPU" = xx86_64; then
+    if test "x$FLAGS_CPU" = xaarch64; then
+      $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -D_ARM64_ -Darm64"
+    elif test "x$FLAGS_CPU" = xx86_64; then
      $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -D_AMD64_ -Damd64"
    else
      $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -D_X86_ -Dx86"
@@ -672,9 +660,21 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
  # CFLAGS PER CPU
  if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then
    # COMMON to gcc and clang
+    AC_MSG_CHECKING([if $1 is x86])
    if test "x$FLAGS_CPU" = xx86; then
-      # Force compatibility with i586 on 32 bit intel platforms.
-      $1_CFLAGS_CPU="-march=i586"
+      AC_MSG_RESULT([yes])
+      AC_MSG_CHECKING([if control flow protection is enabled by additional compiler flags])
+      if echo "${EXTRA_CFLAGS}${EXTRA_CXXFLAGS}${EXTRA_ASFLAGS}" | ${GREP} -q 'fcf-protection' ; then
+        # cf-protection requires CMOV and thus i686
+        $1_CFLAGS_CPU="-march=i686"
+        AC_MSG_RESULT([yes, forcing ${$1_CFLAGS_CPU}])
+      else
+        # Force compatibility with i586 on 32 bit intel platforms.
+        $1_CFLAGS_CPU="-march=i586"
+        AC_MSG_RESULT([no, forcing ${$1_CFLAGS_CPU}])
+      fi
+    else
+      AC_MSG_RESULT([no])
    fi
  fi

@@ -739,6 +739,18 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
    $1_WARNING_CFLAGS_JVM="-Wno-format-zero-length -Wtype-limits -Wuninitialized"
  fi

+  if test "x$TOOLCHAIN_TYPE" = xmicrosoft && test "x$ENABLE_REPRODUCIBLE_BUILD" = xtrue; then
+    # Enabling deterministic creates warnings if __DATE__ or __TIME__ are
+    # used, and since we are, silence that warning.
+    REPRODUCIBLE_CFLAGS="-experimental:deterministic -wd5048"
+    FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [${REPRODUCIBLE_CFLAGS}],
+        PREFIX: $3,
+        IF_FALSE: [
+            REPRODUCIBLE_CFLAGS=
+        ]
+    )
+  fi
+
  # Prevent the __FILE__ macro from generating absolute paths into the built
  # binaries. Depending on toolchain, different mitigations are possible.
  # * GCC and Clang of new enough versions have -fmacro-prefix-map.
@@ -757,6 +769,29 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
              FILE_MACRO_CFLAGS=
          ]
      )
+    elif test "x$TOOLCHAIN_TYPE" = xmicrosoft &&
+        test "x$ENABLE_REPRODUCIBLE_BUILD" = xtrue; then
+      # There is a known issue with the pathmap if the mapping is made to the
+      # empty string. Add a minimal string "s" as prefix to work around this.
+      workspace_root_win=`$FIXPATH_BASE print "${WORKSPACE_ROOT%/}"`
+      # PATHMAP_FLAGS is also added to LDFLAGS in flags-ldflags.m4.
+      PATHMAP_FLAGS="-pathmap:${workspace_root_win//\//\\\\}=s \
+          -pathmap:${workspace_root_win}=s"
+      FILE_MACRO_CFLAGS="$PATHMAP_FLAGS"
+      FLAGS_COMPILER_CHECK_ARGUMENTS(ARGUMENT: [${FILE_MACRO_CFLAGS}],
+          PREFIX: $3,
+          IF_FALSE: [
+              PATHMAP_FLAGS=
+              FILE_MACRO_CFLAGS=
+          ]
+      )
+    fi
+
+    AC_MSG_CHECKING([how to prevent absolute paths in output])
+    if test "x$FILE_MACRO_CFLAGS" != x; then
+      AC_MSG_RESULT([using compiler options])
+    else
+      AC_MSG_RESULT([using relative paths])
    fi
  fi
  AC_SUBST(FILE_MACRO_CFLAGS)
@@ -765,12 +800,13 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
  CFLAGS_JVM_COMMON="$ALWAYS_CFLAGS_JVM $ALWAYS_DEFINES_JVM \
      $TOOLCHAIN_CFLAGS_JVM ${$1_TOOLCHAIN_CFLAGS_JVM} \
      $OS_CFLAGS $OS_CFLAGS_JVM $CFLAGS_OS_DEF_JVM $DEBUG_CFLAGS_JVM \
-      $WARNING_CFLAGS $WARNING_CFLAGS_JVM $JVM_PICFLAG $FILE_MACRO_CFLAGS"
+      $WARNING_CFLAGS $WARNING_CFLAGS_JVM $JVM_PICFLAG $FILE_MACRO_CFLAGS \
+      $REPRODUCIBLE_CFLAGS"

  CFLAGS_JDK_COMMON="$ALWAYS_CFLAGS_JDK $ALWAYS_DEFINES_JDK $TOOLCHAIN_CFLAGS_JDK \
      $OS_CFLAGS $CFLAGS_OS_DEF_JDK $DEBUG_CFLAGS_JDK $DEBUG_OPTIONS_FLAGS_JDK \
      $WARNING_CFLAGS $WARNING_CFLAGS_JDK $DEBUG_SYMBOLS_CFLAGS_JDK \
-      $FILE_MACRO_CFLAGS"
+      $FILE_MACRO_CFLAGS $REPRODUCIBLE_CFLAGS"

  # Use ${$2EXTRA_CFLAGS} to block EXTRA_CFLAGS to be added to build flags.
  # (Currently we don't have any OPENJDK_BUILD_EXTRA_CFLAGS, but that might
--- a/make/autoconf/flags-ldflags.m4
+++ b/make/autoconf/flags-ldflags.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -66,11 +66,11 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
    # Add -z,defs, to forbid undefined symbols in object files.
    # add -z,relro (mark relocations read only) for all libs
    # add -z,now ("full relro" - more of the Global Offset Table GOT is marked read only)
-    BASIC_LDFLAGS="-Wl,--hash-style=gnu -Wl,-z,defs -Wl,-z,relro -Wl,-z,now"
+    BASIC_LDFLAGS="-Wl,-z,defs -Wl,-z,relro -Wl,-z,now"
    # Linux : remove unused code+data in link step
    if test "x$ENABLE_LINKTIME_GC" = xtrue; then
      if test "x$OPENJDK_TARGET_CPU" = xs390x; then
-        BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,--gc-sections -Wl,--print-gc-sections"
+        BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,--gc-sections"
      else
        BASIC_LDFLAGS_JDK_ONLY="$BASIC_LDFLAGS_JDK_ONLY -Wl,--gc-sections"
      fi
@@ -106,7 +106,14 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
      # Assume clang or gcc.
      # FIXME: We should really generalize SET_SHARED_LIBRARY_ORIGIN instead.
      OS_LDFLAGS_JVM_ONLY="-Wl,-rpath,@loader_path/. -Wl,-rpath,@loader_path/.."
-      OS_LDFLAGS_JDK_ONLY="-mmacosx-version-min=$MACOSX_VERSION_MIN"
+      OS_LDFLAGS="-mmacosx-version-min=$MACOSX_VERSION_MIN"
+    fi
+    if test "x$OPENJDK_TARGET_OS" = xlinux; then
+      # Hotspot needs to link librt to get the clock_* functions.
+      # But once our supported minimum build and runtime platform
+      # has glibc 2.17, this can be removed as the functions are
+      # in libc.
+      OS_LDFLAGS_JVM_ONLY="-lrt"
    fi
  fi

@@ -137,9 +144,17 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
    fi
  fi

+  if test "x$ENABLE_REPRODUCIBLE_BUILD" = "xtrue"; then
+    if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+      REPRODUCIBLE_LDFLAGS="-experimental:deterministic"
+    fi
+  fi
+
  if test "x$ALLOW_ABSOLUTE_PATHS_IN_OUTPUT" = "xfalse"; then
    if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
      BASIC_LDFLAGS="$BASIC_LDFLAGS -pdbaltpath:%_PDB%"
+      # PATHMAP_FLAGS is setup in flags-cflags.m4.
+      FILE_MACRO_LDFLAGS="${PATHMAP_FLAGS}"
    fi
  fi

@@ -164,21 +179,30 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_CPU_DEP],
      $1_CPU_LDFLAGS="$ARM_ARCH_TYPE_FLAGS $ARM_FLOAT_TYPE_FLAGS"
    fi

+    # MIPS ABI does not support GNU hash style
+    if test "x${OPENJDK_$1_CPU}" = xmips ||
+       test "x${OPENJDK_$1_CPU}" = xmipsel ||
+       test "x${OPENJDK_$1_CPU}" = xmips64 ||
+       test "x${OPENJDK_$1_CPU}" = xmips64el; then
+      $1_CPU_LDFLAGS="${$1_CPU_LDFLAGS} -Wl,--hash-style=sysv"
+    else
+      $1_CPU_LDFLAGS="${$1_CPU_LDFLAGS} -Wl,--hash-style=gnu"
+    fi
+
  elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+    if test "x${OPENJDK_$1_CPU_BITS}" = "x32"; then
+      $1_CPU_EXECUTABLE_LDFLAGS="-stack:327680"
+    elif test "x${OPENJDK_$1_CPU_BITS}" = "x64"; then
+      $1_CPU_EXECUTABLE_LDFLAGS="-stack:1048576"
+    fi
    if test "x${OPENJDK_$1_CPU}" = "xx86"; then
      $1_CPU_LDFLAGS="-safeseh"
-      # NOTE: Old build added -machine. Probably not needed.
-      $1_CPU_LDFLAGS_JVM_ONLY="-machine:I386"
-      $1_CPU_EXECUTABLE_LDFLAGS="-stack:327680"
-    else
-      $1_CPU_LDFLAGS_JVM_ONLY="-machine:AMD64"
-      $1_CPU_EXECUTABLE_LDFLAGS="-stack:1048576"
    fi
  fi

  # JVM_VARIANT_PATH depends on if this is build or target...
  if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
-    $1_LDFLAGS_JDK_LIBPATH="-libpath:${OUTPUTDIR}/support/modules_libs/java.base"
+    $1_LDFLAGS_JDK_LIBPATH="-libpath:\$(SUPPORT_OUTPUTDIR)/modules_libs/java.base"
  else
    $1_LDFLAGS_JDK_LIBPATH="-L\$(SUPPORT_OUTPUTDIR)/modules_libs/java.base \
        -L\$(SUPPORT_OUTPUTDIR)/modules_libs/java.base/${$1_JVM_VARIANT_PATH}"
@@ -186,15 +210,17 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_CPU_DEP],

  # Export variables according to old definitions, prefix with $2 if present.
  LDFLAGS_JDK_COMMON="$BASIC_LDFLAGS $BASIC_LDFLAGS_JDK_ONLY \
-      $OS_LDFLAGS_JDK_ONLY $DEBUGLEVEL_LDFLAGS_JDK_ONLY ${$2EXTRA_LDFLAGS}"
+      $OS_LDFLAGS $DEBUGLEVEL_LDFLAGS_JDK_ONLY ${$2EXTRA_LDFLAGS}"
  $2LDFLAGS_JDKLIB="$LDFLAGS_JDK_COMMON $BASIC_LDFLAGS_JDK_LIB_ONLY \
-      ${$1_LDFLAGS_JDK_LIBPATH} $SHARED_LIBRARY_FLAGS"
+      ${$1_LDFLAGS_JDK_LIBPATH} $SHARED_LIBRARY_FLAGS \
+      $REPRODUCIBLE_LDFLAGS $FILE_MACRO_LDFLAGS"
  $2LDFLAGS_JDKEXE="$LDFLAGS_JDK_COMMON $EXECUTABLE_LDFLAGS \
-      ${$1_CPU_EXECUTABLE_LDFLAGS}"
+      ${$1_CPU_EXECUTABLE_LDFLAGS} $REPRODUCIBLE_LDFLAGS $FILE_MACRO_LDFLAGS"

-  $2JVM_LDFLAGS="$BASIC_LDFLAGS $BASIC_LDFLAGS_JVM_ONLY $OS_LDFLAGS_JVM_ONLY \
+  $2JVM_LDFLAGS="$BASIC_LDFLAGS $BASIC_LDFLAGS_JVM_ONLY $OS_LDFLAGS $OS_LDFLAGS_JVM_ONLY \
      $DEBUGLEVEL_LDFLAGS $DEBUGLEVEL_LDFLAGS_JVM_ONLY $BASIC_LDFLAGS_ONLYCXX \
-      ${$1_CPU_LDFLAGS} ${$1_CPU_LDFLAGS_JVM_ONLY} ${$2EXTRA_LDFLAGS}"
+      ${$1_CPU_LDFLAGS} ${$1_CPU_LDFLAGS_JVM_ONLY} ${$2EXTRA_LDFLAGS} \
+      $REPRODUCIBLE_LDFLAGS $FILE_MACRO_LDFLAGS"

  AC_SUBST($2LDFLAGS_JDKLIB)
  AC_SUBST($2LDFLAGS_JDKEXE)
--- a/make/autoconf/flags.m4
+++ b/make/autoconf/flags.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -130,7 +130,7 @@ AC_DEFUN([FLAGS_SETUP_MACOSX_VERSION],
    # of the OS. It currently has a hard coded value. Setting this also limits
    # exposure to API changes in header files. Bumping this is likely to
    # require code changes to build.
-    MACOSX_VERSION_MIN=10.9.0
+    MACOSX_VERSION_MIN=10.12.0
    MACOSX_VERSION_MIN_NODOTS=${MACOSX_VERSION_MIN//\./}

    AC_SUBST(MACOSX_VERSION_MIN)
@@ -226,6 +226,14 @@ AC_DEFUN([FLAGS_SETUP_SYSROOT_FLAGS],
    fi
  fi

+  # For the microsoft toolchain, we need to get the SYSROOT flags from the
+  # Visual Studio environment. Currently we cannot handle this as a separate
+  # build toolchain.
+  if test "x$1" = x && test "x$OPENJDK_BUILD_OS" = "xwindows" \
+      && test "x$TOOLCHAIN_TYPE" = "xmicrosoft"; then
+    TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV
+  fi
+
  AC_SUBST($1SYSROOT_CFLAGS)
  AC_SUBST($1SYSROOT_LDFLAGS)
 ])
@@ -234,6 +242,7 @@ AC_DEFUN_ONCE([FLAGS_PRE_TOOLCHAIN],
 [
  # We should always include user supplied flags
  FLAGS_SETUP_USER_SUPPLIED_FLAGS
+
  # The sysroot flags are needed for configure to be able to run the compilers
  FLAGS_SETUP_SYSROOT_FLAGS

@@ -258,10 +267,6 @@ AC_DEFUN_ONCE([FLAGS_PRE_TOOLCHAIN],
  GLOBAL_LDFLAGS="$MACHINE_FLAG $SYSROOT_LDFLAGS $USER_LDFLAGS"
  # FIXME: Don't really know how to do with this, but this was the old behavior
  GLOBAL_CPPFLAGS="$SYSROOT_CFLAGS"
-  AC_SUBST(GLOBAL_CFLAGS)
-  AC_SUBST(GLOBAL_CXXFLAGS)
-  AC_SUBST(GLOBAL_LDFLAGS)
-  AC_SUBST(GLOBAL_CPPFLAGS)

  # FIXME: For compatilibity, export this as EXTRA_CFLAGS for now.
  EXTRA_CFLAGS="$MACHINE_FLAG $USER_CFLAGS"
@@ -280,6 +285,14 @@ AC_DEFUN_ONCE([FLAGS_PRE_TOOLCHAIN],
  CXXFLAGS="$GLOBAL_CXXFLAGS"
  LDFLAGS="$GLOBAL_LDFLAGS"
  CPPFLAGS="$GLOBAL_CPPFLAGS"
+
+  if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+    # When autoconf sends both compiler and linker flags to cl.exe at the same
+    # time, linker flags must be last at the command line. Achieve this by
+    # moving them to LIBS.
+    LIBS="$LIBS -link $LDFLAGS"
+    LDFLAGS=""
+  fi
 ])

 AC_DEFUN([FLAGS_SETUP_TOOLCHAIN_CONTROL],
@@ -370,9 +383,6 @@ AC_DEFUN_ONCE([FLAGS_POST_TOOLCHAIN],
      BUILD_SYSROOT_LDFLAGS="$SYSROOT_LDFLAGS"
    fi
  fi
-  AC_SUBST(BUILD_SYSROOT_CFLAGS)
-  AC_SUBST(BUILD_SYSROOT_LDFLAGS)
-
 ])

 AC_DEFUN([FLAGS_SETUP_FLAGS],
--- a/make/autoconf/help.m4
+++ b/make/autoconf/help.m4
@@ -25,7 +25,7 @@

 AC_DEFUN_ONCE([HELP_SETUP_DEPENDENCY_HELP],
 [
-  AC_CHECK_PROGS(PKGHANDLER, zypper apt-get yum brew port pkgutil pkgadd)
+  UTIL_LOOKUP_PROGS(PKGHANDLER, zypper apt-get yum brew port pkgutil pkgadd pacman)
 ])

 AC_DEFUN([HELP_MSG_MISSING_DEPENDENCY],
@@ -38,8 +38,6 @@ AC_DEFUN([HELP_MSG_MISSING_DEPENDENCY],
    HELP_MSG="OpenJDK distributions are available at http://jdk.java.net/."
  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.cygwin"; then
    cygwin_help $MISSING_DEPENDENCY
-  elif test "x$OPENJDK_BUILD_OS_ENV" = "xwindows.msys"; then
-    msys_help $MISSING_DEPENDENCY
  else
    PKGHANDLER_COMMAND=

@@ -58,6 +56,8 @@ AC_DEFUN([HELP_MSG_MISSING_DEPENDENCY],
        pkgadd_help  $MISSING_DEPENDENCY ;;
      zypper)
        zypper_help  $MISSING_DEPENDENCY ;;
+      pacman)
+        pacman_help  $MISSING_DEPENDENCY ;;
    esac

    if test "x$PKGHANDLER_COMMAND" != x; then
@@ -83,10 +83,6 @@ cygwin_help() {
  esac
 }

-msys_help() {
-  PKGHANDLER_COMMAND=""
-}
-
 apt_help() {
  case $1 in
    reduced)
@@ -165,6 +161,17 @@ brew_help() {
  esac
 }

+pacman_help() {
+  case $1 in
+    unzip)
+      PKGHANDLER_COMMAND="sudo pacman -S unzip" ;;
+    zip)
+      PKGHANDLER_COMMAND="sudo pacman -S zip" ;;
+    make)
+      PKGHANDLER_COMMAND="sudo pacman -S make" ;;
+  esac
+}
+
 port_help() {
  PKGHANDLER_COMMAND=""
 }
@@ -238,6 +245,7 @@ AC_DEFUN_ONCE([HELP_PRINT_SUMMARY_AND_WARNINGS],

  printf "\n"
  printf "Configuration summary:\n"
+  printf "* Name:           $CONF_NAME\n"
  printf "* Debug level:    $DEBUG_LEVEL\n"
  printf "* HS debug level: $HOTSPOT_DEBUG_LEVEL\n"
  printf "* JVM variants:   $JVM_VARIANTS\n"
@@ -256,16 +264,13 @@ AC_DEFUN_ONCE([HELP_PRINT_SUMMARY_AND_WARNINGS],
  printf "\n"
  printf "Tools summary:\n"
  if test "x$OPENJDK_BUILD_OS" = "xwindows"; then
-    printf "* Environment:    $WINDOWS_ENV_VENDOR version $WINDOWS_ENV_VERSION. Windows version $WINDOWS_VERSION"
-    if test "x$WINDOWS_ENV_ROOT_PATH" != "x"; then
-      printf ". Root at $WINDOWS_ENV_ROOT_PATH"
-    fi
-    printf "\n"
+    printf "* Environment:    %s version %s; windows version %s; prefix \"%s\"; root \"%s\"\n" \
+        "$WINENV_VENDOR" "$WINENV_VERSION" "$WINDOWS_VERSION" "$WINENV_PREFIX" "$WINENV_ROOT"
  fi
  printf "* Boot JDK:       $BOOT_JDK_VERSION (at $BOOT_JDK)\n"
  printf "* Toolchain:      $TOOLCHAIN_TYPE ($TOOLCHAIN_DESCRIPTION)\n"
-  printf "* C Compiler:     Version $CC_VERSION_NUMBER (at $CC)\n"
-  printf "* C++ Compiler:   Version $CXX_VERSION_NUMBER (at $CXX)\n"
+  printf "* C Compiler:     Version $CC_VERSION_NUMBER (at ${CC#"$FIXPATH "})\n"
+  printf "* C++ Compiler:   Version $CXX_VERSION_NUMBER (at ${CXX#"$FIXPATH "})\n"

  printf "\n"
  printf "Build performance summary:\n"
--- a/make/autoconf/jdk-options.m4
+++ b/make/autoconf/jdk-options.m4
@@ -228,23 +228,6 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_JDK_OPTIONS],
 ])

 ###############################################################################
-#
-# Enable or disable the elliptic curve crypto implementation
-#
-AC_DEFUN_ONCE([JDKOPT_DETECT_INTREE_EC],
-[
-  AC_MSG_CHECKING([if elliptic curve crypto implementation is present])
-
-  if test -d "${TOPDIR}/src/jdk.crypto.ec/share/native/libsunec/impl"; then
-    ENABLE_INTREE_EC=true
-    AC_MSG_RESULT([yes])
-  else
-    ENABLE_INTREE_EC=false
-    AC_MSG_RESULT([no])
-  fi
-
-  AC_SUBST(ENABLE_INTREE_EC)
-])

 AC_DEFUN_ONCE([JDKOPT_SETUP_DEBUG_SYMBOLS],
 [
@@ -405,9 +388,9 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_CODE_COVERAGE],
    UTIL_FIXUP_PATH(JCOV_HOME)
    if test "x$with_jcov_input_jdk" != "x" ; then
      JCOV_INPUT_JDK="$with_jcov_input_jdk"
-      if test ! -f "$JCOV_INPUT_JDK/bin/java$EXE_SUFFIX"; then
+      if test ! -f "$JCOV_INPUT_JDK/bin/java" && test ! -f "$JCOV_INPUT_JDK/bin/java.exe"; then
        AC_MSG_RESULT([fail])
-        AC_MSG_ERROR([Invalid JDK bundle: "$JCOV_INPUT_JDK/bin/java$EXE_SUFFIX" does not exist])
+        AC_MSG_ERROR([Invalid JDK bundle: "$JCOV_INPUT_JDK/bin/java" does not exist])
      fi
      UTIL_FIXUP_PATH(JCOV_INPUT_JDK)
    fi
@@ -440,7 +423,10 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_ADDRESS_SANITIZER],
        fi
      ],
      IF_ENABLED: [
-        ASAN_CFLAGS="-fsanitize=address -fno-omit-frame-pointer"
+        # ASan is simply incompatible with gcc -Wstringop-truncation. See
+        # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85650
+        # It's harmless to be suppressed in clang as well.
+        ASAN_CFLAGS="-fsanitize=address -Wno-stringop-truncation -fno-omit-frame-pointer"
        ASAN_LDFLAGS="-fsanitize=address"
        JVM_CFLAGS="$JVM_CFLAGS $ASAN_CFLAGS"
        JVM_LDFLAGS="$JVM_LDFLAGS $ASAN_LDFLAGS"
@@ -654,7 +640,7 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_REPRODUCIBLE_BUILD],
    SOURCE_DATE=$($DATE +"%s")
    AC_MSG_RESULT([$SOURCE_DATE, from 'current'])
  elif test "x$with_source_date" = xversion; then
-    # Use the date from version-numbers
+    # Use the date from version-numbers.conf
    UTIL_GET_EPOCH_TIMESTAMP(SOURCE_DATE, $DEFAULT_VERSION_DATE)
    if test "x$SOURCE_DATE" = x; then
      AC_MSG_RESULT([unavailable])
@@ -678,10 +664,27 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_REPRODUCIBLE_BUILD],
    fi
  fi

-  UTIL_ARG_ENABLE(NAME: reproducible-build, DEFAULT: $with_source_date_present,
+  REPRODUCIBLE_BUILD_DEFAULT=$with_source_date_present
+
+  if test "x$OPENJDK_BUILD_OS" = xwindows && \
+      test "x$ALLOW_ABSOLUTE_PATHS_IN_OUTPUT" = xfalse; then
+    # To support banning absolute paths on Windows, we must use the -pathmap
+    # method, which requires reproducible builds.
+    REPRODUCIBLE_BUILD_DEFAULT=true
+  fi
+
+  UTIL_ARG_ENABLE(NAME: reproducible-build, DEFAULT: $REPRODUCIBLE_BUILD_DEFAULT,
      RESULT: ENABLE_REPRODUCIBLE_BUILD,
      DESC: [enable reproducible builds (not yet fully functional)],
-      DEFAULT_DESC: [enabled if --with-source-date is given])
+      DEFAULT_DESC: [enabled if --with-source-date is given or on Windows without absolute paths])
+
+  if test "x$OPENJDK_BUILD_OS" = xwindows && \
+      test "x$ALLOW_ABSOLUTE_PATHS_IN_OUTPUT" = xfalse && \
+      test "x$ENABLE_REPRODUCIBLE_BUILD" = xfalse; then
+    AC_MSG_NOTICE([On Windows it is not possible to combine  --disable-reproducible-builds])
+    AC_MSG_NOTICE([with --disable-absolute-paths-in-output.])
+    AC_MSG_ERROR([Cannot continue])
+  fi

  AC_SUBST(SOURCE_DATE)
  AC_SUBST(ENABLE_REPRODUCIBLE_BUILD)
--- a/make/autoconf/jdk-version.m4
+++ b/make/autoconf/jdk-version.m4
@@ -58,7 +58,9 @@ AC_DEFUN([JDKVER_CHECK_AND_SET_NUMBER],
 AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
 [
  # Source the version numbers file
-  . $AUTOCONF_DIR/version-numbers
+  . $TOPDIR/make/conf/version-numbers.conf
+  # Source the branding file
+  . $TOPDIR/make/conf/branding.conf

  # Some non-version number information is set in that file
  AC_SUBST(LAUNCHER_NAME)
@@ -79,7 +81,7 @@ AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
    # Set JDK_RC_NAME to a custom value if '--with-jdk-rc-name' was used and is not empty.
    JDK_RC_NAME="$with_jdk_rc_name"
  else
-    # Otherwise calculate from "version-numbers" included above.
+    # Otherwise calculate from "branding.conf" included above.
    JDK_RC_NAME="$PRODUCT_NAME $JDK_RC_PLATFORM_NAME"
  fi
  AC_SUBST(JDK_RC_NAME)
@@ -94,7 +96,7 @@ AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
    AC_MSG_ERROR([--with-vendor-name contains non-printing characters: $with_vendor_name])
  elif test "x$with_vendor_name" != x; then
    # Only set COMPANY_NAME if '--with-vendor-name' was used and is not empty.
-    # Otherwise we will use the value from "version-numbers" included above.
+    # Otherwise we will use the value from "branding.conf" included above.
    COMPANY_NAME="$with_vendor_name"
  fi
  AC_SUBST(COMPANY_NAME)
@@ -108,7 +110,7 @@ AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
    AC_MSG_ERROR([--with-vendor-url contains non-printing characters: $with_vendor_url])
  elif test "x$with_vendor_url" != x; then
    # Only set VENDOR_URL if '--with-vendor-url' was used and is not empty.
-    # Otherwise we will use the value from "version-numbers" included above.
+    # Otherwise we will use the value from "branding.conf" included above.
    VENDOR_URL="$with_vendor_url"
  fi
  AC_SUBST(VENDOR_URL)
@@ -122,7 +124,7 @@ AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
    AC_MSG_ERROR([--with-vendor-bug-url contains non-printing characters: $with_vendor_bug_url])
  elif test "x$with_vendor_bug_url" != x; then
    # Only set VENDOR_URL_BUG if '--with-vendor-bug-url' was used and is not empty.
-    # Otherwise we will use the value from "version-numbers" included above.
+    # Otherwise we will use the value from "branding.conf" included above.
    VENDOR_URL_BUG="$with_vendor_bug_url"
  fi
  AC_SUBST(VENDOR_URL_BUG)
@@ -136,7 +138,7 @@ AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
    AC_MSG_ERROR([--with-vendor-vm-bug-url contains non-printing characters: $with_vendor_vm_bug_url])
  elif test "x$with_vendor_vm_bug_url" != x; then
    # Only set VENDOR_URL_VM_BUG if '--with-vendor-vm-bug-url' was used and is not empty.
-    # Otherwise we will use the value from "version-numbers" included above.
+    # Otherwise we will use the value from "branding.conf" included above.
    VENDOR_URL_VM_BUG="$with_vendor_vm_bug_url"
  fi
  AC_SUBST(VENDOR_URL_VM_BUG)
@@ -280,7 +282,7 @@ AC_DEFUN_ONCE([JDKVER_SETUP_JDK_VERSION_NUMBERS],
    fi
  else
    if test "x$NO_DEFAULT_VERSION_PARTS" != xtrue; then
-      # Default is to get value from version-numbers
+      # Default is to get value from version-numbers.conf
      VERSION_FEATURE="$DEFAULT_VERSION_FEATURE"
    fi
  fi
--- a/make/autoconf/jvm-features.m4
+++ b/make/autoconf/jvm-features.m4
@@ -159,7 +159,7 @@ AC_DEFUN_ONCE([JVM_FEATURES_PARSE_OPTIONS],
  # Likewise, check for deprecated arguments.
  m4_foreach(FEATURE, m4_split(jvm_features_deprecated), [
    AC_ARG_ENABLE(jvm-feature-FEATURE, AS_HELP_STRING(
-        [--enable-jvm-feature-FEATURE], 
+        [--enable-jvm-feature-FEATURE],
        [Deprecated. Option is kept for backwards compatibility and is ignored]))

    m4_define(FEATURE_SHELL, [enable_jvm_feature_]m4_translit(FEATURE, -, _))
@@ -237,8 +237,9 @@ AC_DEFUN_ONCE([JVM_FEATURES_CHECK_AOT],
  JVM_FEATURES_CHECK_AVAILABILITY(aot, [
    AC_MSG_CHECKING([if platform is supported by AOT])
    # AOT is only available where JVMCI is available since it requires JVMCI.
-    if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
-        test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
+    if test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
+      AC_MSG_RESULT([yes])
+    elif test "x$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU" = "xlinux-aarch64"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no, $OPENJDK_TARGET_CPU])
@@ -303,8 +304,9 @@ AC_DEFUN_ONCE([JVM_FEATURES_CHECK_GRAAL],
  JVM_FEATURES_CHECK_AVAILABILITY(graal, [
    AC_MSG_CHECKING([if platform is supported by Graal])
    # Graal is only available where JVMCI is available since it requires JVMCI.
-    if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
-        test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
+    if test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
+      AC_MSG_RESULT([yes])
+    elif test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no, $OPENJDK_TARGET_CPU])
@@ -336,8 +338,9 @@ AC_DEFUN_ONCE([JVM_FEATURES_CHECK_JVMCI],
 [
  JVM_FEATURES_CHECK_AVAILABILITY(jvmci, [
    AC_MSG_CHECKING([if platform is supported by JVMCI])
-    if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
-        test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
+    if test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
+      AC_MSG_RESULT([yes])
+    elif test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no, $OPENJDK_TARGET_CPU])
@@ -395,8 +398,14 @@ AC_DEFUN_ONCE([JVM_FEATURES_CHECK_ZGC],
        AC_MSG_RESULT([no, $OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU])
        AVAILABLE=false
      fi
-    elif test "x$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU" = "xlinux-aarch64"; then
-      AC_MSG_RESULT([yes])
+    elif test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
+      if test "x$OPENJDK_TARGET_OS" = "xlinux" || \
+          test "x$OPENJDK_TARGET_OS" = "xwindows"; then
+        AC_MSG_RESULT([yes])
+      else
+        AC_MSG_RESULT([no, $OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU])
+        AVAILABLE=false
+      fi
    else
      AC_MSG_RESULT([no, $OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU])
      AVAILABLE=false
@@ -467,7 +476,7 @@ AC_DEFUN([JVM_FEATURES_PREPARE_VARIANT],
    JVM_FEATURES_VARIANT_UNAVAILABLE="cds minimal zero"
  elif test "x$variant" = "xzero"; then
    JVM_FEATURES_VARIANT_UNAVAILABLE="aot cds compiler1 compiler2 \
-        epsilongc g1gc graal jvmci minimal shenandoahgc zgc"
+        graal jvmci minimal zgc"
  else
    JVM_FEATURES_VARIANT_UNAVAILABLE="minimal zero"
  fi
--- a/make/autoconf/libraries.m4
+++ b/make/autoconf/libraries.m4
@@ -43,9 +43,11 @@ AC_DEFUN_ONCE([LIB_DETERMINE_DEPENDENCIES],
  if test "x$OPENJDK_TARGET_OS" = xwindows || test "x$OPENJDK_TARGET_OS" = xmacosx; then
    # No X11 support on windows or macosx
    NEEDS_LIB_X11=false
+  elif test "x$ENABLE_HEADLESS_ONLY" = xtrue; then
+    # No X11 support needed when building headless only
+    NEEDS_LIB_X11=false
  else
-    # All other instances need X11, even if building headless only, libawt still
-    # needs X11 headers.
+    # All other instances need X11
    NEEDS_LIB_X11=true
  fi

@@ -122,6 +124,20 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBRARIES],
    BASIC_JVM_LIBS="$BASIC_JVM_LIBS -lpthread"
  fi

+  # Atomic library
+  # 32-bit platforms needs fallback library for 8-byte atomic ops on Zero
+  if HOTSPOT_CHECK_JVM_VARIANT(zero); then
+    if test "x$OPENJDK_TARGET_OS" = xlinux &&
+        (test "x$OPENJDK_TARGET_CPU" = xarm ||
+         test "x$OPENJDK_TARGET_CPU" = xm68k ||
+         test "x$OPENJDK_TARGET_CPU" = xmips ||
+         test "x$OPENJDK_TARGET_CPU" = xmipsel ||
+         test "x$OPENJDK_TARGET_CPU" = xppc ||
+         test "x$OPENJDK_TARGET_CPU" = xsh); then
+      BASIC_JVM_LIBS="$BASIC_JVM_LIBS -latomic"
+    fi
+  fi
+
  # perfstat lib
  if test "x$OPENJDK_TARGET_OS" = xaix; then
    BASIC_JVM_LIBS="$BASIC_JVM_LIBS -lperfstat"
--- a/make/autoconf/platform.m4
+++ b/make/autoconf/platform.m4
@@ -206,9 +206,9 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_OS],
      VAR_OS=windows
      VAR_OS_ENV=windows.wsl
      ;;
-    *mingw*)
+    *msys*)
      VAR_OS=windows
-      VAR_OS_ENV=windows.msys
+      VAR_OS_ENV=windows.msys2
      ;;
    *aix*)
      VAR_OS=aix
@@ -220,6 +220,24 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_OS],
  esac
 ])

+# Support macro for PLATFORM_EXTRACT_TARGET_AND_BUILD.
+# Converts autoconf style OS name to OpenJDK style, into
+# VAR_LIBC.
+AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_LIBC],
+[
+  case "$1" in
+    *linux*-musl)
+      VAR_LIBC=musl
+      ;;
+    *linux*-gnu)
+      VAR_LIBC=gnu
+      ;;
+    *)
+      VAR_LIBC=default
+      ;;
+  esac
+])
+
 # Expects $host_os $host_cpu $build_os and $build_cpu
 # and $with_target_bits to have been setup!
 #
@@ -237,9 +255,10 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  AC_SUBST(OPENJDK_TARGET_AUTOCONF_NAME)
  AC_SUBST(OPENJDK_BUILD_AUTOCONF_NAME)

-  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU variables.
+  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU/LIBC variables.
  PLATFORM_EXTRACT_VARS_FROM_OS($build_os)
  PLATFORM_EXTRACT_VARS_FROM_CPU($build_cpu)
+  PLATFORM_EXTRACT_VARS_FROM_LIBC($build_os)
  # ..and setup our own variables. (Do this explicitly to facilitate searching)
  OPENJDK_BUILD_OS="$VAR_OS"
  if test "x$VAR_OS_TYPE" != x; then
@@ -256,6 +275,7 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  OPENJDK_BUILD_CPU_ARCH="$VAR_CPU_ARCH"
  OPENJDK_BUILD_CPU_BITS="$VAR_CPU_BITS"
  OPENJDK_BUILD_CPU_ENDIAN="$VAR_CPU_ENDIAN"
+  OPENJDK_BUILD_LIBC="$VAR_LIBC"
  AC_SUBST(OPENJDK_BUILD_OS)
  AC_SUBST(OPENJDK_BUILD_OS_TYPE)
  AC_SUBST(OPENJDK_BUILD_OS_ENV)
@@ -263,13 +283,20 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  AC_SUBST(OPENJDK_BUILD_CPU_ARCH)
  AC_SUBST(OPENJDK_BUILD_CPU_BITS)
  AC_SUBST(OPENJDK_BUILD_CPU_ENDIAN)
+  AC_SUBST(OPENJDK_BUILD_LIBC)

  AC_MSG_CHECKING([openjdk-build os-cpu])
  AC_MSG_RESULT([$OPENJDK_BUILD_OS-$OPENJDK_BUILD_CPU])

-  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU variables.
+  if test "x$OPENJDK_BUILD_OS" = "xlinux"; then
+    AC_MSG_CHECKING([openjdk-build C library])
+    AC_MSG_RESULT([$OPENJDK_BUILD_LIBC])
+  fi
+
+  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU/LIBC variables.
  PLATFORM_EXTRACT_VARS_FROM_OS($host_os)
  PLATFORM_EXTRACT_VARS_FROM_CPU($host_cpu)
+  PLATFORM_EXTRACT_VARS_FROM_LIBC($host_os)
  # ... and setup our own variables. (Do this explicitly to facilitate searching)
  OPENJDK_TARGET_OS="$VAR_OS"
  if test "x$VAR_OS_TYPE" != x; then
@@ -287,6 +314,7 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  OPENJDK_TARGET_CPU_BITS="$VAR_CPU_BITS"
  OPENJDK_TARGET_CPU_ENDIAN="$VAR_CPU_ENDIAN"
  OPENJDK_TARGET_OS_UPPERCASE=`$ECHO $OPENJDK_TARGET_OS | $TR 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+  OPENJDK_TARGET_LIBC="$VAR_LIBC"

  AC_SUBST(OPENJDK_TARGET_OS)
  AC_SUBST(OPENJDK_TARGET_OS_TYPE)
@@ -296,9 +324,15 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  AC_SUBST(OPENJDK_TARGET_CPU_ARCH)
  AC_SUBST(OPENJDK_TARGET_CPU_BITS)
  AC_SUBST(OPENJDK_TARGET_CPU_ENDIAN)
+  AC_SUBST(OPENJDK_TARGET_LIBC)

  AC_MSG_CHECKING([openjdk-target os-cpu])
  AC_MSG_RESULT([$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU])
+
+  if test "x$OPENJDK_TARGET_OS" = "xlinux"; then
+    AC_MSG_CHECKING([openjdk-target C library])
+    AC_MSG_RESULT([$OPENJDK_TARGET_LIBC])
+  fi
 ])

 # Check if a reduced build (32-bit on 64-bit platforms) is requested, and modify behaviour
@@ -420,7 +454,13 @@ AC_DEFUN([PLATFORM_SETUP_LEGACY_VARS_HELPER],
  else
    OPENJDK_$1_CPU_BUNDLE="$OPENJDK_$1_CPU"
  fi
-  OPENJDK_$1_BUNDLE_PLATFORM="${OPENJDK_$1_OS_BUNDLE}-${OPENJDK_$1_CPU_BUNDLE}"
+
+  OPENJDK_$1_LIBC_BUNDLE=""
+  if test "x$OPENJDK_$1_LIBC" = "xmusl"; then
+    OPENJDK_$1_LIBC_BUNDLE="-$OPENJDK_$1_LIBC"
+  fi
+
+  OPENJDK_$1_BUNDLE_PLATFORM="${OPENJDK_$1_OS_BUNDLE}-${OPENJDK_$1_CPU_BUNDLE}${OPENJDK_$1_LIBC_BUNDLE}"
  AC_SUBST(OPENJDK_$1_BUNDLE_PLATFORM)

  if test "x$COMPILE_TYPE" = "xcross"; then
@@ -493,6 +533,9 @@ AC_DEFUN([PLATFORM_SETUP_LEGACY_VARS_HELPER],
  fi
  AC_SUBST(HOTSPOT_$1_CPU_DEFINE)

+  HOTSPOT_$1_LIBC=$OPENJDK_$1_LIBC
+  AC_SUBST(HOTSPOT_$1_LIBC)
+
  # For historical reasons, the OS include directories have odd names.
  OPENJDK_$1_OS_INCLUDE_SUBDIR="$OPENJDK_TARGET_OS"
  if test "x$OPENJDK_TARGET_OS" = "xwindows"; then
@@ -518,9 +561,11 @@ AC_DEFUN([PLATFORM_SET_RELEASE_FILE_OS_VALUES],
    RELEASE_FILE_OS_NAME="AIX"
  fi
  RELEASE_FILE_OS_ARCH=${OPENJDK_TARGET_CPU}
+  RELEASE_FILE_LIBC=${OPENJDK_TARGET_LIBC}

  AC_SUBST(RELEASE_FILE_OS_NAME)
  AC_SUBST(RELEASE_FILE_OS_ARCH)
+  AC_SUBST(RELEASE_FILE_LIBC)
 ])

 AC_DEFUN([PLATFORM_SET_MODULE_TARGET_OS_VALUES],
--- a/make/autoconf/source-dirs.m4
+++ b/make/autoconf/source-dirs.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -28,9 +28,6 @@ AC_DEFUN_ONCE([SRCDIRS_SETUP_DIRS],
  OUTPUTDIR="$OUTPUTDIR"
  AC_SUBST(OUTPUTDIR)
  JDK_OUTPUTDIR="$OUTPUTDIR/jdk"
-
-  # Where are the sources.
-  AC_SUBST(TOPDIR)
 ])

 ################################################################################
--- a/Show More
+++ b/Show More