Revert "8267256: Extend minimal retry for loopback connections on Windows to PlainSocketImpl"

This reverts commit 4cacd185f3.
Revert "8250521: Configure initial RTO to use minimal retry for loopback connections on Windows"
2025-12-07 01:50:12 +01:00 · 2022-01-29 08:04:30 +07:00 · 2022-01-29 07:22:08 +07:00 · 2022-01-29 07:21:59 +07:00 · 2022-01-29 04:53:05 +07:00 · 2022-01-28 15:23:13 +07:00
7712 changed files with 1128359 additions and 279362 deletions
--- a/.gitattributes
+++ b/.gitattributes
@@ -0,0 +1 @@
+*	-text
--- a/.github/workflows/submit.yml
+++ b/.github/workflows/submit.yml
--- a/.hgtags
+++ b/.hgtags
@@ -613,3 +613,31 @@ e872676174c7f171a9864becba83cb783cfec9d0 jdk-11.0.9+9
 4fd46d208f0a4b55924af8e0c2fb6bcf46e18ec6 jdk-11.0.9.1+0
 27723943c0dd65a191cbefe031cec001521e4b13 jdk-11.0.9.1+1
 31affc22b3b5f5d43783ffadf57f22848bad9db8 jdk-11.0.9.1-ga
+f3168de4eb0dd74bf8e81537f62742bde5e412c3 jdk-11.0.10+1
+a35aa07b57bab3690224e3af939ee085d50eb476 jdk-11.0.10+2
+bca12c00a776f8cee7a0eeaf788499b9eab9cf9d jdk-11.0.10+3
+9504fa6f98f5aad0aa1ac36d5bff3260a32020c8 jdk-11.0.10+4
+5f5c3544ccb4d0bbc638e665524b292860dd9515 jdk-11.0.10+5
+4b9bc2a1dde0631958393125997855382325964d jdk-11.0.10+6
+c45f74d45787a857d35b5a66c9b0304c91a9c5d0 jdk-11.0.10+7
+43428f69099f6f87f6e1922deacbf13e1adb751f jdk-11.0.10+8
+8b3498547395ee80a6e731078056b2aeb3e3c5e8 jdk-11.0.10+9
+8b3498547395ee80a6e731078056b2aeb3e3c5e8 jdk-11.0.10-ga
+4ed322bf6b0098353ceaecf35662fadf457cd81d jdk-11.0.11+1
+b68647c6ecc1e73111d8047448d75966f255460f jdk-11.0.11+2
+14cc036b17a5f4be5b0643e6b24ed32563684ab9 jdk-11.0.11+3
+c4405735470a92e2c45490b89a8099252f3481d2 jdk-11.0.11+4
+38430a8a4488582612c6a87ab58d109cc5217e8b jdk-11.0.11+5
+e41ae00add1d76a8f25adb558933382947ea840d jdk-11.0.11+6
+14f9928caac31368d27f13e4e21ca25c1e0be950 jdk-11.0.11+7
+9f0347b029d3a0349f23befcfb68ee02d85d9034 jdk-11.0.11+8
+15862747ee15445292b4b9949b4f0f4badba4812 jdk-11.0.11+9
+15862747ee15445292b4b9949b4f0f4badba4812 jdk-11.0.11-ga
+5720ffa08f8514b9f0ea8b3a49e05a872c9c0efe jdk-11.0.12+1
+70a4031a8bef3e693f34864fdd482429c73dc76a jdk-11.0.12+2
+873a691b1ae4fa8b55ca5d08fa21aca3a4904fb8 jdk-11.0.12+3
+40d1e784e1937aaea696a9654cc2d944d3d78996 jdk-11.0.12+4
+6aa6f6860508fca3a97aea1de7a36574498d22bf jdk-11.0.12+5
+91e81ac088545abdc3eaaa707853d31a6cf99af3 jdk-11.0.12+6
+f412f2537f1502a9697a9684c77bea8d848db1ab jdk-11.0.12+7
+f412f2537f1502a9697a9684c77bea8d848db1ab jdk-11.0.12-ga
--- a/.idea/copyright/JetBrains.xml
+++ b/.idea/copyright/JetBrains.xml
@@ -1,9 +1,7 @@
 <component name="CopyrightManager">
  <copyright>
-    <option name="notice" value="Copyright 2000-&amp;#36;today.year JetBrains s.r.o.&#10;&#10;Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);&#10;you may not use this file except in compliance with the License.&#10;You may obtain a copy of the License at&#10;&#10;http://www.apache.org/licenses/LICENSE-2.0&#10;&#10;Unless required by applicable law or agreed to in writing, software&#10;distributed under the License is distributed on an &quot;AS IS&quot; BASIS,&#10;WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.&#10;See the License for the specific language governing permissions and&#10;limitations under the License." />
-    <option name="keyword" value="Copyright" />
-    <option name="allowReplaceKeyword" value="JetBrains" />
+    <option name="allowReplaceRegexp" value="JetBrains" />
+    <option name="notice" value="Copyright 2000-&amp;#36;today.year JetBrains s.r.o.&#10;DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.&#10; &#10;This code is free software; you can redistribute it and/or modify it&#10;under the terms of the GNU General Public License version 2 only, as&#10;published by the Free Software Foundation.&#10;&#10;This code is distributed in the hope that it will be useful, but WITHOUT&#10;ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or&#10;FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License&#10;version 2 for more details (a copy is included in the LICENSE file that&#10;accompanied this code).&#10;&#10;You should have received a copy of the GNU General Public License version&#10;2 along with this work; if not, write to the Free Software Foundation,&#10;Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.&#10;&#10;Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA&#10;or visit www.oracle.com if you need additional information or have any&#10;questions." />
    <option name="myName" value="JetBrains" />
-    <option name="myLocal" value="true" />
  </copyright>
 </component>
--- a/.jcheck/conf
+++ b/.jcheck/conf
@@ -1,2 +1,31 @@
-project=jdk10
-bugids=dup
+[general]
+project=jdk-updates
+jbs=JDK
+version=11.0.14
+
+[checks]
+error=author,committer,reviewers,merge,issues,executable,symlink,message,hg-tag,whitespace
+
+[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)
+branches=
+
+[census]
+version=0
+domain=openjdk.org
+
+[checks "whitespace"]
+files=.*\.cpp|.*\.hpp|.*\.c|.*\.h|.*\.java
+
+[checks "merge"]
+message=Merge
+
+[checks "reviewers"]
+reviewers=1
+ignore=duke
+
+[checks "committer"]
+role=committer
+
+[checks "issues"]
+pattern=^([124-8][0-9]{6}): (\S.*)$
--- a/README.md
+++ b/README.md
@@ -1,91 +1,173 @@
 [![official JetBrains project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)

-# Downloads
+# Welcome to JetBrains Runtime! 
+<a name="jetbrains-runtime"></a>

-|Windows-x64  |macOS        |Linux-x64    |
-|-------------|-------------|-------------|
-|[ ![Download](https://api.bintray.com/packages/jetbrains/intellij-jdk/openjdk11-windows-x64/images/download.svg) ](https://bintray.com/jetbrains/intellij-jdk/openjdk11-windows-x64/_latestVersion)|[ ![Download](https://api.bintray.com/packages/jetbrains/intellij-jdk/openjdk11-osx-x64/images/download.svg) ](https://bintray.com/jetbrains/intellij-jdk/openjdk11-osx-x64/_latestVersion)|[ ![Download](https://api.bintray.com/packages/jetbrains/intellij-jdk/openjdk11-linux-x64/images/download.svg) ](https://bintray.com/jetbrains/intellij-jdk/openjdk11-linux-x64/_latestVersion)|
+JetBrains Runtime is a fork of [OpenJDK](https://github.com/openjdk/jdk) available for Windows, Mac OS X, and Linux.
+It includes a number enhancements in font rendering, HiDPI support, ligatures, performance improvements, and bugfixes.

+## Releases
+Download the latest releases of JetBrains Runtime to use with JetBrains IDEs. The full list
+can be found on the [releases page](https://github.com/JetBrains/JetBrainsRuntime/releases).

-# How JetBrains Runtime is organised
-## Workspaces
+| IDE Version | Latest JBR                                                                                        | Date Released |
+|-------------|---------------------------------------------------------------------------------------------------|---------------|
+| 2022.1      | [11_0_13-b1890.3](https://github.com/JetBrains/JetBrainsRuntime/releases/tag/jbr11_0_13b1890.3 )  | 18-Jan-2022   |
+| 2021.3      | [11_0_13-b1751.25](https://github.com/JetBrains/JetBrainsRuntime/releases/tag/jbr11_0_13b1751.25) | 17-Jan-2022   |
+| 2021.2      | [11_0_13-b1504.49](https://github.com/JetBrains/JetBrainsRuntime/releases/tag/jb11_0_13-b1504.49) | 15-Nov-2021   |
+| 2021.1      | [11.0.11+9-b1341.60](https://confluence.jetbrains.com/pages/viewpage.action?pageId=218857477)     | 15-Jun-2021   |
+| 2020.3      | [11_0_11-b1145.115](https://confluence.jetbrains.com/pages/viewpage.action?pageId=219349001)      | 21-Jun-2021   |

-[github.com/JetBrains/JetBrainsRuntime](https://github.com/JetBrains/JetBrainsRuntime)  
+## Contents
+- [Welcome to JetBrains Runtime](#jetbrains-runtime)
+  - [Products Built on JetBrains Runtime](#products-built-on-jetbrains-runtime)
+  - [Getting Sources](#getting-sources)
+    - [macOS, Linux](#macos-linux)
+    - [Windows](#sources-windows)
+  - [Configuring the Build Environment](#configuring-the-build-environment)
+    - [Linux (Docker)](#linux-docker)
+    - [Ubuntu Linux](#ubuntu-linux)
+    - [Windows](#build-windows)
+    - [macOS](#macos)
+  - [Developing](#developing)
+  - [Contributing](#contributing)
+  - [Resources](#resources)

-## Getting sources
-__macOS, Linux:__
+## Products Built on JetBrains Runtime
+* [Android Studio](https://developer.android.com/studio). The official IDE for Google's Android operating system.
+* [CLion](https://www.jetbrains.com/clion/). A cross-platform IDE for C and C++ from JetBrains.
+* [DataGrip](https://www.jetbrains.com/datagrip/). The IDE for Databases and SQL from JetBrains.
+* [GoLand](https://www.jetbrains.com/go/). The cross-platform Go IDE from JetBrains.
+* [IntelliJ IDEA](https://www.jetbrains.com/idea/). The IDE for JVM from JetBrains.
+* [JProfiler](https://www.ej-technologies.com/products/jprofiler/overview.html). The Java profiler.
+* [PhpStorm](https://www.jetbrains.com/phpstorm/). The PHP IDE from JetBrains.
+* [PyCharm](https://www.jetbrains.com/pycharm/). The Python IDE from JetBrains.
+* [Rider](https://www.jetbrains.com/rider/). The cross-platform .NET IDE from JetBrains.
+* [RubyMine](https://www.jetbrains.com/ruby/). The Ruby and Rails IDE from JetBrains.
+* [WebStorm](https://www.jetbrains.com/webstorm/). The JavaScript IDE from JetBrains.
+* [YourKit](https://www.yourkit.com/). Java and .NET profilers.
+
+## Getting Sources
+### macOS, Linux
 ```
 git config --global core.autocrlf input
 git clone git@github.com:JetBrains/JetBrainsRuntime.git
 ```

-__Windows:__
+### Windows
+<a name="sources-windows"></a>
 ```
 git config --global core.autocrlf false
 git clone git@github.com:JetBrains/JetBrainsRuntime.git
 ```

-# Configure local build environment
-[OpenJDK build docs](http://hg.openjdk.java.net/jdk/jdk11/raw-file/tip/doc/building.html)  
-Tip for all platforms: run `./configure` and check output.  
-Usually, it has meaningful advice how to solve your problem.
+## Configuring the Build Environment
+Here are quick per-platform instructions for those who can't wait to get started. 
+Please refer to [OpenJDK build docs](http://hg.openjdk.java.net/jdk/jdk11/raw-file/tip/doc/building.html) for in-depth
+coverage of all the details.

-## Linux (Docker)
+> **_TIP:_**  To get a preliminary report of what's missing, run `./configure` and check its output. 
+> It would usually have a meaningful advice on how to solve the problem.
+
+### Linux (Docker)
+Create a container:
 ```
 $ cd jb/project/docker
 $ docker build .
 ...
 Successfully built 942ea9900054
-
+```
+Run these commands in the new container:
+```
 $ docker run -v `pwd`../../../../:/JetBrainsRuntime -it 942ea9900054
-
 # cd /JetBrainsRuntime
 # sh ./configure
 # make images CONF=linux-x86_64-normal-server-release
 ```

-## Linux (Ubuntu 18.10 desktop)
+### Ubuntu Linux
+Install the necessary tools, libraries, and headers with:
+```
+$ sudo apt-get install autoconf make build-essential libx11-dev libxext-dev libxrender-dev libxtst-dev \
+       libxt-dev libxrandr-dev libcups2-dev libfontconfig1-dev libasound2-dev \
+       openjdk-11-jdk
+```
+Then run the following:
 ```
-$ sudo apt-get install autoconf make build-essential libx11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev libxrandr-dev libcups2-dev libfontconfig1-dev libasound2-dev 
-
 $ cd JetBrainsRuntime
 $ sh ./configure --disable-warnings-as-errors
 $ make images
 ```

-## Windows
-Install:
-* [Cygwin x64](http://www.cygwin.com/)  
-  Required packages: autoconf, binutils, cpio, diffutils, file, gawk, gcc-core, make, m4, unzip, zip.  
-  **Install them while installing Cygwin**.
-* Visual Studio compiler toolset [Download](https://visualstudio.microsoft.com/downloads/)  
-  Visual Studio 2015 has support by default.  
-  **Install with desktop development kit, it includes Windows SDK and compilers**.
-* [Java 11](http://www.oracle.com/technetwork/java/javase/downloads/index.html)  
-  If you have problems while configuring [read Java tips on Cygwin](http://horstmann.com/articles/cygwin-tips.html)
+### Windows
+<a name="build-windows"></a>
+Install the following:
+* [Cygwin x64](http://www.cygwin.com/).
+  Required packages: `autoconf`, `binutils`, `cpio`, `diffutils`, `file`, `gawk`, `gcc-core`, `make`, `m4`, `unzip`, `zip`.  
+  Install those together with Cygwin.
+* [Visual Studio compiler toolset](https://visualstudio.microsoft.com/downloads/).
+  Install with the desktop development kit, which includes Windows SDK and compilers.
+  Visual Studio 2015 is supported by default.
+* [Java 11](https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/downloads-list.html). 
+  If you have problems while configuring, read [Java tips on Cygwin](http://horstmann.com/articles/cygwin-tips.html).

-From command line: 
+From the command line: 
 ```
-"c:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" amd64
-"c:\Program_Files\cygwin64\bin\mintty.exe" /bin/bash -l
+"c:\Program Files (x86)\Microsoft Visual Studio 15.0\VC\vcvarsall.bat" amd64
+c:\cygwin64\bin\mintty.exe /usr/bin/bash -l
 ```
-First command will set env vars, the second will run Cygwin shell with proper environment.  
+The first command sets up environment variables, the second starts a Cygwin shell with the proper environment.  

-In Cygwin shell: 
-```    
-cd JetBrainsRuntime
-bash configure --enable-option-checking=fatal --with-toolchain-version=2015 --with-boot-jdk="/cygdrive/c/Program Files/Java/jdk-11.0.5" --disable-warnings-as-errors
-make images
+In the Cygwin shell: 
+```
+$ cd JetBrainsRuntime
+$ bash configure --enable-option-checking=fatal --with-toolchain-version=2015 \
+                 --with-boot-jdk="/cygdrive/c/Program Files/Java/jdk-11.0.5" --disable-warnings-as-errors
+$ make images
 ```

-## macOS
-Install Xcode command line developer tools, autoconf (via Homebrew).
+### macOS
+Install the following:
+* Xcode command line developer tools and `autoconf` via [Homebrew](getDpiInfo).
+* [Java 11](https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/downloads-list.html).

-Run:
+From the command line:
 ```
-sh ./configure --prefix=$(pwd)/build  --disable-warnings-as-errors
-make images
+$ cd JetBrainsRuntime
+$ sh ./configure --prefix=$(pwd)/build  --disable-warnings-as-errors
+$ make images
 ```

-## Contribution
-We will be happy to receive your pull requests. Before you submit one, please sign our Contributor License Agreement (CLA)  https://www.jetbrains.com/agreements/cla/ 
+## Developing
+You can use  [CLion](https://www.jetbrains.com/clion/) to develop native parts of the JetBrains Runtime and
+[IntelliJ IDEA](https://www.jetbrains.com/idea/) for the parts written in Java.
+Both require projects to be created.
+
+### CLion
+Run
+```
+$ make compile-commands
+```
+in the git root and open the resulting `build/.../compile_commands.json` file as a project.
+Then use `Tools | Compilation Database | Change Project Root` to point to git root of this repository.
+
+See also this detailed step-by-step tutorial for all platforms:
+[How to develop OpenJDK with CLion](https://blog.jetbrains.com/clion/2020/03/openjdk-with-clion/).
+
+### IDEA
+Run
+```
+$ sh ./bin/idea.sh
+```
+in the git root to generate project files (add `--help` for options). Then open the git root directory
+as a project in IDEA.
+
+## Contributing
+We are happy to receive your pull requests! 
+Before you submit one, please sign our [Contributor License Agreement (CLA)](https://www.jetbrains.com/agreements/cla/).
+
+## Resources
+* [JetBrains Runtime on github](https://github.com/JetBrains/JetBrainsRuntime).
+* [OpenJDK build instructions](http://hg.openjdk.java.net/jdk/jdk11/raw-file/tip/doc/building.html).
+* [OpenJDK test instructions](http://hg.openjdk.java.net/jdk/jdk11/raw-file/tip/doc/building.html#running-tests).
+* [How to develop OpenJDK with CLion](https://blog.jetbrains.com/clion/2020/03/openjdk-with-clion/).
--- a/doc/building.html
+++ b/doc/building.html
@@ -68,10 +68,12 @@
 </ul></li>
 <li><a href="#running-tests">Running Tests</a></li>
 <li><a href="#cross-compiling">Cross-compiling</a><ul>
+<li><a href="#cross-compiling-the-easy-way-with-openjdk-devkits">Cross compiling the easy way with OpenJDK devkits</a></li>
 <li><a href="#boot-jdk-and-build-jdk">Boot JDK and Build JDK</a></li>
 <li><a href="#specifying-the-target-platform">Specifying the Target Platform</a></li>
 <li><a href="#toolchain-considerations">Toolchain Considerations</a></li>
 <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="#verifying-the-build">Verifying the Build</a></li>
 </ul></li>
@@ -91,12 +93,10 @@
 <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-forest-for-pushing-changes-defpath">Setting Up a Forest 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>
@@ -110,10 +110,10 @@
 </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>
@@ -129,8 +129,8 @@
 <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 forests. 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 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 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>
@@ -141,7 +141,11 @@
 <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>
@@ -191,7 +195,7 @@
 <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 layer is Cygwin. (Msys is no longer supported due to a too old bash; msys2 and the new Windows Subsystem for Linux (WSL) 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 thus 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>
@@ -353,7 +357,7 @@ cc: Sun C 5.13 SunOS_i386 2014/10/20
 $ CC -V
 CC: Sun C++ 5.13 SunOS_i386 151846-10 2015/10/30</code></pre>
 <h3 id="microsoft-visual-studio">Microsoft Visual Studio</h3>
-<p>The minimum accepted version of Visual Studio is 2010. Older versions will not be accepted by <code>configure</code>. The maximum accepted version of Visual Studio is 2017. Versions older than 2017 are unlikely to continue working for long.</p>
+<p>The minimum accepted version of Visual Studio is 2010. Older versions will not be accepted by <code>configure</code>. The maximum accepted version of Visual Studio is 2019. Versions older than 2017 are unlikely to continue working for long.</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=2015</code>.</p>
 <p>If you get <code>LINK: fatal error LNK1123: failure during conversion to COFF: file invalid</code> when building using Visual Studio 2010, you have encountered <a href="http://support.microsoft.com/kb/2757355">KB2757355</a>, a bug triggered by a specific installation order. However, the solution suggested by the KB article does not always resolve the problem. See <a href="https://stackoverflow.com/questions/10888391">this stackoverflow discussion</a> for other suggestions.</p>
 <h3 id="ibm-xl-cc">IBM XL C/C++</h3>
@@ -565,6 +569,47 @@ CC: Sun C++ 5.13 SunOS_i386 151846-10 2015/10/30</code></pre>
 <p>This requires a more complex setup and build procedure. This section assumes you are familiar with cross-compiling in general, and will only deal with the particularities of cross-compiling the JDK. If you are new to cross-compiling, please see the <a href="https://en.wikipedia.org/wiki/Cross_compiler#External_links">external links at Wikipedia</a> for a good start on reading materials.</p>
 <p>Cross-compiling the JDK requires you to be able to build both for the build platform and for the target platform. The reason for the former is that we need to build and execute tools during the build process, both native tools and Java tools.</p>
 <p>If all you want to do is to compile a 32-bit version, for the same OS, on a 64-bit machine, consider using <code>--with-target-bits=32</code> instead of doing a full-blown cross-compilation. (While this surely is possible, it's a lot more work and will take much longer to build.)</p>
+<h3 id="cross-compiling-the-easy-way-with-openjdk-devkits">Cross compiling the easy way with OpenJDK devkits</h3>
+<p>The OpenJDK build system provides out-of-the box support for creating and using so called devkits. A <code>devkit</code> is basically a collection of a cross-compiling toolchain and a sysroot environment which can easily be used together with the <code>--with-devkit</code> configure option to cross compile the OpenJDK. On Linux/x86_64, the following command:</p>
+<pre><code>bash configure --with-devkit=&lt;devkit-path&gt; --openjdk-target=ppc64-linux-gnu &amp;&amp; make</code></pre>
+<p>will configure and build OpenJDK for Linux/ppc64 assuming that <code>&lt;devkit-path&gt;</code> points to a Linux/x86_64 to Linux/ppc64 devkit.</p>
+<p>Devkits can be created from the <code>make/devkit</code> directory by executing:</p>
+<pre><code>make [ TARGETS=&quot;&lt;TARGET_TRIPLET&gt;+&quot; ] [ BASE_OS=&lt;OS&gt; ] [ BASE_OS_VERSION=&lt;VER&gt; ]</code></pre>
+<p>where <code>TARGETS</code> contains one or more <code>TARGET_TRIPLET</code>s of the form described in <a href="https://sourceware.org/autobook/autobook/autobook_17.html">section 3.4 of the GNU Autobook</a>. If no targets are given, a native toolchain for the current platform will be created. Currently, at least the following targets are known to work:</p>
+<table>
+<thead>
+<tr class="header">
+<th>Supported devkit targets</th>
+</tr>
+</thead>
+<tbody>
+<tr class="odd">
+<td>x86_64-linux-gnu</td>
+</tr>
+<tr class="even">
+<td>aarch64-linux-gnu</td>
+</tr>
+<tr class="odd">
+<td>arm-linux-gnueabihf</td>
+</tr>
+<tr class="even">
+<td>ppc64-linux-gnu</td>
+</tr>
+<tr class="odd">
+<td>ppc64le-linux-gnu</td>
+</tr>
+<tr class="even">
+<td>s390x-linux-gnu</td>
+</tr>
+</tbody>
+</table>
+<p><code>BASE_OS</code> must be one of &quot;OEL6&quot; for Oracle Enterprise Linux 6 or &quot;Fedora&quot; (if not specified &quot;OEL6&quot; will be the default). If the base OS is &quot;Fedora&quot; the corresponding Fedora release can be specified with the help of the <code>BASE_OS_VERSION</code> option (with &quot;27&quot; as default version). If the build is successful, the new devkits can be found in the <code>build/devkit/result</code> subdirectory:</p>
+<pre><code>cd make/devkit
+make TARGETS=&quot;ppc64le-linux-gnu aarch64-linux-gnu&quot; BASE_OS=Fedora BASE_OS_VERSION=21
+ls -1 ../../build/devkit/result/
+x86_64-linux-gnu-to-aarch64-linux-gnu
+x86_64-linux-gnu-to-ppc64le-linux-gnu</code></pre>
+<p>Notice that devkits are not only useful for targeting different build platforms. Because they contain the full build dependencies for a system (i.e. compiler and root file system), they can easily be used to build well-known, reliable and reproducible build environments. You can for example create and use a devkit with GCC 7.3 and a Fedora 12 sysroot environment (with glibc 2.11) on Ubuntu 14.04 (which doesn't have GCC 7.3 by default) to produce OpenJDK binaries which will run on all Linux systems with runtime libraries newer than the ones from Fedora 12 (e.g. Ubuntu 16.04, SLES 11 or RHEL 6).</p>
 <h3 id="boot-jdk-and-build-jdk">Boot JDK and Build JDK</h3>
 <p>When cross-compiling, make sure you use a boot JDK that runs on the <em>build</em> system, and not on the <em>target</em> system.</p>
 <p>To be able to build, we need a &quot;Build JDK&quot;, which is a JDK built from the current sources (that is, the same as the end result of the entire build process), but able to run on the <em>build</em> system, and not the <em>target</em> system. (In contrast, the Boot JDK should be from an older release, e.g. JDK 8 when building JDK 9.)</p>
@@ -634,6 +679,85 @@ cp: cannot stat `arm-linux-gnueabihf/libSM.so&#39;: No such file or directory
 cp: cannot stat `arm-linux-gnueabihf/libXt.so&#39;: No such file or directory</code></pre></li>
 <li><p>If the X11 libraries are not properly detected by <code>configure</code>, you can point them out by <code>--with-x</code>.</p></li>
 </ul>
+<h3 id="creating-and-using-sysroots-with-qemu-deboostrap">Creating And Using Sysroots With qemu-deboostrap</h3>
+<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><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></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>
+<thead>
+<tr class="header">
+<th style="text-align: left;">Target</th>
+<th style="text-align: left;"><code>CC</code></th>
+<th style="text-align: left;"><code>CXX</code></th>
+<th><code>--arch=...</code></th>
+<th><code>--openjdk-target=...</code></th>
+</tr>
+</thead>
+<tbody>
+<tr class="odd">
+<td style="text-align: left;">x86</td>
+<td style="text-align: left;">default</td>
+<td style="text-align: left;">default</td>
+<td>i386</td>
+<td>i386-linux-gnu</td>
+</tr>
+<tr class="even">
+<td style="text-align: left;">armhf</td>
+<td style="text-align: left;">gcc-arm-linux-gnueabihf</td>
+<td style="text-align: left;">g++-arm-linux-gnueabihf</td>
+<td>armhf</td>
+<td>arm-linux-gnueabihf</td>
+</tr>
+<tr class="odd">
+<td style="text-align: left;">aarch64</td>
+<td style="text-align: left;">gcc-aarch64-linux-gnu</td>
+<td style="text-align: left;">g++-aarch64-linux-gnu</td>
+<td>arm64</td>
+<td>aarch64-linux-gnu</td>
+</tr>
+<tr class="even">
+<td style="text-align: left;">ppc64el</td>
+<td style="text-align: left;">gcc-powerpc64le-linux-gnu</td>
+<td style="text-align: left;">g++-powerpc64le-linux-gnu</td>
+<td>ppc64el</td>
+<td>powerpc64le-linux-gnu</td>
+</tr>
+<tr class="odd">
+<td style="text-align: left;">s390x</td>
+<td style="text-align: left;">gcc-s390x-linux-gnu</td>
+<td style="text-align: left;">g++-s390x-linux-gnu</td>
+<td>s390x</td>
+<td>s390x-linux-gnu</td>
+</tr>
+</tbody>
+</table>
+<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>
 <p>The JDK contains two different ports for the aarch64 platform, one is the original aarch64 port from the <a href="http://openjdk.java.net/projects/aarch64-port">AArch64 Port Project</a> and one is a 64-bit version of the Oracle contributed ARM port. When targeting aarch64, by the default the original aarch64 port is used. To select the Oracle ARM 64 port, use <code>--with-cpu-port=arm64</code>. Also set the corresponding value (<code>aarch64</code> or <code>arm64</code>) to --with-abi-profile, to ensure a consistent build.</p>
@@ -680,14 +804,14 @@ cp: cannot stat `arm-linux-gnueabihf/libXt.so&#39;: No such file or directory</c

 === 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 ===

@@ -710,11 +834,11 @@ Hint: If caused by a warning, try configure --disable-warnings-as-errors.</code>
 <p>Verify that the summary at the end looks correct. Are you indeed using the Boot JDK and native toolchain that you expect?</p>
 <p>By default, the JDK has a strict approach where warnings from the compiler is considered errors which fail the build. For very new or very old compiler versions, this can trigger new classes of warnings, which thus fails the build. Run <code>configure</code> with <code>--disable-warnings-as-errors</code> to turn of this behavior. (The warnings will still show, but not make the build fail.)</p>
 <h4 id="problems-with-incremental-rebuilds">Problems with Incremental Rebuilds</h4>
-<p>Incremental rebuilds mean that when you modify part of the product, only the affected parts get rebuilt. While this works great in most cases, and significantly speed up the development process, from time to time complex interdependencies will result in an incorrect build result. This is the most common cause for unexpected build problems, together with inconsistencies between the different Mercurial repositories in the forest.</p>
+<p>Incremental rebuilds mean that when you modify part of the product, only the affected parts get rebuilt. While this works great in most cases, and significantly speed up the development process, from time to time complex interdependencies will result in an incorrect build result. This is the most common cause for unexpected build problems.</p>
 <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 forest is up-to-date</p>
-<p>Run <code>bash get_source.sh</code> to make sure you have the latest version of all repositories.</p></li>
+<li><p>Make sure your repository is up-to-date</p>
+<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>
@@ -723,8 +847,8 @@ 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 forest</p>
-<p>Sometimes the Mercurial repositories themselves 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 forest, 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>
@@ -746,20 +870,6 @@ spawn failed</code></pre>
 <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-forest-for-pushing-changes-defpath">Setting Up a Forest 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>
-<p>If you also have the <code>trees</code> extension installed in Mercurial, you will automatically get a <code>tdefpath</code> command, which is even more useful. By running <code>hg tdefpath -du &lt;username&gt;</code> in the top repository of your forest, all repos will get setup automatically. This is the recommended usage.</p>
 <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>
@@ -813,14 +923,6 @@ 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
-can see a list of all available forests. If you want to build an older version,
+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.

-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.
@@ -171,7 +183,7 @@ supported due to a too old bash; msys2 and the new Windows Subsystem for Linux
 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
@@ -371,7 +383,7 @@ CC: Sun C++ 5.13 SunOS_i386 151846-10 2015/10/30

 The minimum accepted version of Visual Studio is 2010. Older versions will not
 be accepted by `configure`. The maximum accepted version of Visual Studio is
-2017. Versions older than 2017 are unlikely to continue working for long.
+2019. Versions older than 2017 are unlikely to continue working for long.

 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
@@ -875,6 +887,64 @@ If all you want to do is to compile a 32-bit version, for the same OS, on a
 full-blown cross-compilation. (While this surely is possible, it's a lot more
 work and will take much longer to build.)

+### Cross compiling the easy way with OpenJDK devkits
+
+The OpenJDK build system provides out-of-the box support for creating and using
+so called devkits. A `devkit` is basically a collection of a cross-compiling
+toolchain and a sysroot environment which can easily be used together with the
+`--with-devkit` configure option to cross compile the OpenJDK. On Linux/x86_64,
+the following command:
+```
+bash configure --with-devkit=<devkit-path> --openjdk-target=ppc64-linux-gnu && make
+```
+
+will configure and build OpenJDK for Linux/ppc64 assuming that `<devkit-path>`
+points to a Linux/x86_64 to Linux/ppc64 devkit.
+
+Devkits can be created from the `make/devkit` directory by executing:
+```
+make [ TARGETS="<TARGET_TRIPLET>+" ] [ BASE_OS=<OS> ] [ BASE_OS_VERSION=<VER> ]
+```
+
+where `TARGETS` contains one or more `TARGET_TRIPLET`s of the form
+described in [section 3.4 of the GNU Autobook](
+https://sourceware.org/autobook/autobook/autobook_17.html). If no
+targets are given, a native toolchain for the current platform will be
+created. Currently, at least the following targets are known to work:
+
+ Supported devkit targets
+ ------------------------
+ x86_64-linux-gnu
+ aarch64-linux-gnu
+ arm-linux-gnueabihf
+ ppc64-linux-gnu
+ ppc64le-linux-gnu
+ s390x-linux-gnu
+
+`BASE_OS` must be one of "OEL6" for Oracle Enterprise Linux 6 or
+"Fedora" (if not specified "OEL6" will be the default). If the base OS
+is "Fedora" the corresponding Fedora release can be specified with the
+help of the `BASE_OS_VERSION` option (with "27" as default version).
+If the build is successful, the new devkits can be found in the
+`build/devkit/result` subdirectory:
+```
+cd make/devkit
+make TARGETS="ppc64le-linux-gnu aarch64-linux-gnu" BASE_OS=Fedora BASE_OS_VERSION=21
+ls -1 ../../build/devkit/result/
+x86_64-linux-gnu-to-aarch64-linux-gnu
+x86_64-linux-gnu-to-ppc64le-linux-gnu
+```
+
+Notice that devkits are not only useful for targeting different build
+platforms. Because they contain the full build dependencies for a
+system (i.e. compiler and root file system), they can easily be used
+to build well-known, reliable and reproducible build environments. You
+can for example create and use a devkit with GCC 7.3 and a Fedora 12
+sysroot environment (with glibc 2.11) on Ubuntu 14.04 (which doesn't
+have GCC 7.3 by default) to produce OpenJDK binaries which will run on
+all Linux systems with runtime libraries newer than the ones from
+Fedora 12 (e.g. Ubuntu 16.04, SLES 11 or RHEL 6).
+
 ### Boot JDK and Build JDK

 When cross-compiling, make sure you use a boot JDK that runs on the *build*
@@ -1018,6 +1088,67 @@ Note that X11 is needed even if you only want to build a headless JDK.
  * If the X11 libraries are not properly detected by `configure`, you can
    point them out by `--with-x`.

+### Creating And Using Sysroots With qemu-deboostrap
+
+Fortunately, you can create sysroots for foreign architectures with tools
+provided by your OS. On Debian/Ubuntu systems, one could use `qemu-deboostrap` to
+create the *target* system chroot, which would have the native libraries and headers
+specific to that *target* system. After that, we can use the cross-compiler on the *build*
+system, pointing into chroot to get the build dependencies right. This allows building
+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
+    ```
+
+  * Create chroot on the *build* system, configuring it for *target* system:
+    ```
+    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=~/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/
+    ```
+
+The build does not create new files in that chroot, so it can be reused for multiple builds
+without additional cleanup.
+
+Architectures that are known to successfully cross-compile like this are:
+
+  Target        `CC`                      `CXX`                       `--arch=...` `--openjdk-target=...`
+  ------------  ------------------------- --------------------------- ------------ ----------------------
+  x86           default                   default                     i386         i386-linux-gnu
+  armhf         gcc-arm-linux-gnueabihf   g++-arm-linux-gnueabihf     armhf        arm-linux-gnueabihf
+  aarch64       gcc-aarch64-linux-gnu     g++-aarch64-linux-gnu       arm64        aarch64-linux-gnu
+  ppc64el       gcc-powerpc64le-linux-gnu g++-powerpc64le-linux-gnu   ppc64el      powerpc64le-linux-gnu
+  s390x         gcc-s390x-linux-gnu       g++-s390x-linux-gnu         s390x        s390x-linux-gnu
+
+Additional architectures might be supported by Debian/Ubuntu Ports.
+
 ### Building for ARM/aarch64

 A common cross-compilation target is the ARM CPU. When building for ARM, it is
@@ -1158,14 +1289,14 @@ 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 ===

@@ -1255,17 +1386,15 @@ Incremental rebuilds mean that when you modify part of the product, only the
 affected parts get rebuilt. While this works great in most cases, and
 significantly speed up the development process, from time to time complex
 interdependencies will result in an incorrect build result. This is the most
-common cause for unexpected build problems, together with inconsistencies
-between the different Mercurial repositories in the forest.
+common cause for unexpected build problems.

 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.

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

-    Run `bash get_source.sh` to make sure you have the latest version of all
-    repositories.
+    Run `git pull origin master` to make sure you have the latest changes.

 2. Clean build results

@@ -1290,13 +1419,13 @@ order. Most issues will be solved at step 1 or 2.
    make
    ```

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

-    Sometimes the Mercurial repositories themselves 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 forest, and re-clone
-    it. If you have local changes, save them first to a different location
-    using `hg export`.
+    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
+    `git format-patch`.

 ### Specific Build Issues

@@ -1347,38 +1476,6 @@ contact the Adoption Group. See the section on [Contributing to OpenJDK](

 ## Hints and Suggestions for Advanced Users

-### Setting Up a Forest 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>
-```
-
-If you also have the `trees` extension installed in Mercurial, you will
-automatically get a `tdefpath` command, which is even more useful. By running
-`hg tdefpath -du <username>` in the top repository of your forest, all repos
-will get setup automatically. This is the recommended usage.
-
 ### Bash Completion

 The `configure` and `make` commands tries to play nice with bash command-line
@@ -1521,16 +1618,6 @@ 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/testing.html
+++ b/doc/testing.html
@@ -27,6 +27,7 @@
 <li><a href="#configuration">Configuration</a></li>
 </ul></li>
 <li><a href="#test-selection">Test selection</a><ul>
+<li><a href="#common-test-groups">Common Test Groups</a></li>
 <li><a href="#jtreg">JTReg</a></li>
 <li><a href="#gtest">Gtest</a></li>
 </ul></li>
@@ -59,6 +60,19 @@ $ make exploded-run-test TEST=tier2</code></pre>
 <p>All functionality is available using the run-test make target. In this use case, the test or tests to be executed is controlled using the <code>TEST</code> variable. To speed up subsequent test runs with no source code changes, run-test-only can be used instead, which do not depend on the source and test image build.</p>
 <p>For some common top-level tests, direct make targets have been generated. This includes all JTReg test groups, the hotspot gtest, and custom tests (if present). This means that <code>make run-test-tier1</code> is equivalent to <code>make run-test TEST=&quot;tier1&quot;</code>, but the latter is more tab-completion friendly. For more complex test runs, the <code>run-test TEST=&quot;x&quot;</code> solution needs to be used.</p>
 <p>The test specifications given in <code>TEST</code> is parsed into fully qualified test descriptors, which clearly and unambigously show which tests will be run. As an example, <code>:tier1</code> will expand to <code>jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1 jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 jtreg:$(TOPDIR)/test/nashorn:tier1 jtreg:$(TOPDIR)/test/jaxp:tier1</code>. You can always submit a list of fully qualified test descriptors in the <code>TEST</code> variable if you want to shortcut the parser.</p>
+<h3 id="common-test-groups">Common Test Groups</h3>
+<p>Ideally, all tests are run for every change but this may not be practical due to the limited testing resources, the scope of the change, etc.</p>
+<p>The source tree currently defines a few common test groups in the relevant <code>TEST.groups</code> files. There are test groups that cover a specific component, for example <code>hotspot_gc</code>. It is a good idea to look into <code>TEST.groups</code> files to get a sense what tests are relevant to a particular JDK component.</p>
+<p>Component-specific tests may miss some unintended consequences of a change, so other tests should also be run. Again, it might be impractical to run all tests, and therefore <em>tiered</em> test groups exist. Tiered test groups are not component-specific, but rather cover the significant parts of the entire JDK.</p>
+<p>Multiple tiers allow balancing test coverage and testing costs. Lower test tiers are supposed to contain the simpler, quicker and more stable tests. Higher tiers are supposed to contain progressively more thorough, slower, and sometimes less stable tests, or the tests that require special configuration.</p>
+<p>Contributors are expected to run the tests for the areas that are changed, and the first N tiers they can afford to run, but at least tier1.</p>
+<p>A brief description of the tiered test groups:</p>
+<ul>
+<li><p><code>tier1</code>: This is the lowest test tier. Multiple developers run these tests every day. Because of the widespread use, the tests in <code>tier1</code> are carefully selected and optimized to run fast, and to run in the most stable manner. The test failures in <code>tier1</code> are usually followed up on quickly, either with fixes, or adding relevant tests to problem list. GitHub Actions workflows, if enabled, run <code>tier1</code> tests.</p></li>
+<li><p><code>tier2</code>: This test group covers even more ground. These contain, among other things, tests that either run for too long to be at <code>tier1</code>, or may require special configuration, or tests that are less stable, or cover the broader range of non-core JVM and JDK features/components (for example, XML).</p></li>
+<li><p><code>tier3</code>: This test group includes more stressful tests, the tests for corner cases not covered by previous tiers, plus the tests that require GUIs. As such, this suite should either be run with low concurrency (<code>TEST_JOBS=1</code>), or without headful tests (<code>JTREG_KEYWORDS=\!headful</code>), or both.</p></li>
+<li><p><code>tier4</code>: This test group includes every other test not covered by previous tiers. It includes, for example, <code>vmTestbase</code> suites for Hotspot, which run for many hours even on large machines. It also runs GUI tests, so the same <code>TEST_JOBS</code> and <code>JTREG_KEYWORDS</code> caveats apply.</p></li>
+</ul>
 <h3 id="jtreg">JTReg</h3>
 <p>JTReg tests can be selected either by picking a JTReg test group, or a selection of files or directories containing JTReg tests.</p>
 <p>JTReg test groups can be specified either without a test root, e.g. <code>:tier1</code> (or <code>tier1</code>, the initial colon is optional), or with, e.g. <code>hotspot:tier1</code>, <code>test/jdk:jdk_util</code> or <code>$(TOPDIR)/test/hotspot/jtreg:hotspot_all</code>. The test root can be specified either as an absolute path, or a path relative to the JDK top directory, or the <code>test</code> directory. For simplicity, the hotspot JTReg test root, which really is <code>hotspot/jtreg</code> can be abbreviated as just <code>hotspot</code>.</p>
@@ -142,6 +156,8 @@ TEST FAILURE</code></pre>
 <p>Additional VM options to JTReg (<code>-vmoption</code>).</p>
 <h4 id="aot_modules-1">AOT_MODULES</h4>
 <p>Generate AOT modules before testing for the specified module, or set of modules. If multiple modules are specified, they should be separated by space (or, to help avoid quoting issues, the special value <code>%20</code>).</p>
+<h4 id="retry_count">RETRY_COUNT</h4>
+<p>Retry failed tests up to a set number of times. Defaults to 0.</p>
 <h3 id="gtest-keywords">Gtest keywords</h3>
 <h4 id="repeat">REPEAT</h4>
 <p>The number of times to repeat the tests (<code>--gtest_repeat</code>).</p>
--- a/doc/testing.md
+++ b/doc/testing.md
@@ -52,6 +52,52 @@ jtreg:$(TOPDIR)/test/nashorn:tier1 jtreg:$(TOPDIR)/test/jaxp:tier1`. You can
 always submit a list of fully qualified test descriptors in the `TEST` variable
 if you want to shortcut the parser.

+### Common Test Groups
+
+Ideally, all tests are run for every change but this may not be practical due to the limited
+testing resources, the scope of the change, etc.
+
+The source tree currently defines a few common test groups in the relevant `TEST.groups`
+files. There are test groups that cover a specific component, for example `hotspot_gc`.
+It is a good idea to look into `TEST.groups` files to get a sense what tests are relevant
+to a particular JDK component.
+
+Component-specific tests may miss some unintended consequences of a change, so other
+tests should also be run. Again, it might be impractical to run all tests, and therefore
+_tiered_ test groups exist. Tiered test groups are not component-specific, but rather cover
+the significant parts of the entire JDK.
+
+Multiple tiers allow balancing test coverage and testing costs. Lower test tiers are supposed to
+contain the simpler, quicker and more stable tests. Higher tiers are supposed to contain
+progressively more thorough, slower, and sometimes less stable tests, or the tests that require
+special configuration.
+
+Contributors are expected to run the tests for the areas that are changed, and the first N tiers
+they can afford to run, but at least tier1.
+
+A brief description of the tiered test groups:
+
+- `tier1`: This is the lowest test tier. Multiple developers run these tests every day.
+Because of the widespread use, the tests in `tier1` are carefully selected and optimized to run
+fast, and to run in the most stable manner. The test failures in `tier1` are usually followed up
+on quickly, either with fixes, or adding relevant tests to problem list. GitHub Actions workflows,
+if enabled, run `tier1` tests.
+
+- `tier2`: This test group covers even more ground. These contain, among other things,
+tests that either run for too long to be at `tier1`, or may require special configuration,
+or tests that are less stable, or cover the broader range of non-core JVM and JDK features/components
+(for example, XML).
+
+- `tier3`: This test group includes more stressful tests, the tests for corner cases
+not covered by previous tiers, plus the tests that require GUIs. As such, this suite
+should either be run with low concurrency (`TEST_JOBS=1`), or without headful tests
+(`JTREG_KEYWORDS=\!headful`), or both.
+
+- `tier4`: This test group includes every other test not covered by previous tiers. It includes,
+for example, `vmTestbase` suites for Hotspot, which run for many hours even on large
+machines. It also runs GUI tests, so the same `TEST_JOBS` and `JTREG_KEYWORDS` caveats
+apply.
+
 ### JTReg

 JTReg tests can be selected either by picking a JTReg test group, or a selection
@@ -269,6 +315,10 @@ Generate AOT modules before testing for the specified module, or set of
 modules. If multiple modules are specified, they should be separated by space
 (or, to help avoid quoting issues, the special value `%20`).

+#### RETRY_COUNT
+
+Retry failed tests up to a set number of times. Defaults to 0.
+
 ### Gtest keywords

 #### REPEAT
--- a/jb/project/docker/Dockerfile
+++ b/jb/project/docker/Dockerfile
@@ -4,9 +4,9 @@ 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 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 11
-RUN wget https://bintray.com/jetbrains/intellij-jbr/download_file?file_path=jbrsdk-11_0_3-linux-x64-b360.2.tar.gz \
+RUN wget https://cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-linux_x64.tar.gz \
 -O - | tar xz -C /
-ENV JAVA_HOME /jbrsdk
+ENV JAVA_HOME /zulu11.45.27-ca-jdk11.0.10-linux_x64
 ENV PATH $JAVA_HOME/bin:/opt/rh/devtoolset-8/root/usr/bin:$PATH
 RUN git config --global user.email "teamcity@buildserver.intellij.net"
 RUN git config --global user.name "builduser"
--- a/jb/project/tools/common/scripts/build-jbr-api.sh
+++ b/jb/project/tools/common/scripts/build-jbr-api.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# $1 - Boot JDK
+# $2 - JBR part of API version
+
+cd "`dirname "$0"`/../../../../.."
+PWD="`pwd`"
+CONF="$PWD/build/jbr-api.conf"
+./configure --with-debug-level=release --with-boot-jdk=$1 || exit $?
+make jbr-api CONF=release MAKEOVERRIDES= "JBR_API_CONF_FILE=$CONF" JBR_API_JBR_VERSION=$2 || exit $?
+. $CONF || exit $?
+echo "##teamcity[buildNumber '$VERSION']"
+cp "$JAR" ./jbr-api-${VERSION}.jar || exit $?
+cp "$SOURCES_JAR" ./jbr-api-${VERSION}-sources.jar || exit $?
+echo "##teamcity[publishArtifacts '$PWD/jbr-api-${VERSION}.jar']"
+echo "##teamcity[publishArtifacts '$PWD/jbr-api-${VERSION}-sources.jar']"
--- a/jb/project/tools/linux/scripts/mkimages_aarch64.sh
+++ b/jb/project/tools/linux/scripts/mkimages_aarch64.sh
@@ -6,7 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to bu built; possible values:
 #                        jcef - the bundles 1) jbr with jcef+javafx, 2) jbrsdk and 3) test will be created
-#                        jfx  - the bundle 1) jbr with javafx only will be created
 #
 # jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
 # jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
@@ -17,6 +16,16 @@
 # OpenJDK 64-Bit Server VM (build 11.0.6+${JDK_BUILD_NUMBER}-b${build_number}, mixed mode)
 #

+while getopts ":i?" o; do
+    case "${o}" in
+        i)
+            i="incremental build"
+            INC_BUILD=1
+            ;;
+    esac
+done
+shift $((OPTIND-1))
+
 JBSDK_VERSION=$1
 JDK_BUILD_NUMBER=$2
 build_number=$3
@@ -25,21 +34,27 @@ JBSDK_VERSION_WITH_DOTS=$(echo $JBSDK_VERSION | sed 's/_/\./g')

 source jb/project/tools/common.sh

+function do_configure {
+  sh configure \
+    --disable-warnings-as-errors \
+    --with-debug-level=release \
+    --with-vendor-name="${VENDOR_NAME}" \
+    --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+    --with-jvm-features=shenandoahgc \
+    --with-version-pre= \
+    --with-version-build=${JDK_BUILD_NUMBER} \
+    --with-version-opt=b${build_number} \
+    --with-import-modules=./modular-sdk \
+    --with-boot-jdk=amazon-corretto-11.0.5.10.1-linux-aarch64 \
+    --enable-cds=yes || exit $?
+}
+
 JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}

-sh configure \
-  --disable-warnings-as-errors \
-  --with-debug-level=release \
-  --with-vendor-name="${VENDOR_NAME}" \
-  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
-  --with-jvm-features=shenandoahgc \
-  --with-version-pre= \
-  --with-version-build=${JDK_BUILD_NUMBER} \
-  --with-version-opt=b${build_number} \
-  --with-import-modules=./modular-sdk \
-  --with-boot-jdk=amazon-corretto-11.0.5.10.1-linux-aarch64 \
-  --enable-cds=yes || exit $?
-make clean CONF=linux-aarch64-normal-server-release || exit $?
+if [ -z "$INC_BUILD" ]; then
+  do_configure || do_exit $?
+  make clean CONF=linux-aarch64-normal-server-release || exit $?
+fi
 make images CONF=linux-aarch64-normal-server-release test-image || exit $?

 JBSDK=${JBRSDK_BASE_NAME}-linux-aarch64-b${build_number}
--- a/jb/project/tools/linux/scripts/mkimages_x64.sh
+++ b/jb/project/tools/linux/scripts/mkimages_x64.sh
@@ -6,8 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to be built; possible values:
 #                        jcef - the release bundles with jcef
-#                        jfx - the release bundles with javafx
-#                        jcef_jfx - the release bundles with jcef and javafx
 #                        dcevm - the release bundles with dcevm patches
 #                        nomod - the release bundles without any additional modules (jcef)
 #                        fd - the fastdebug bundles which also include the jcef module
@@ -26,6 +24,16 @@
 #   JCEF_PATH - specifies the path to the directory with JCEF binaries.
 #               By default JCEF binaries should be located in ./jcef_linux_x64

+while getopts ":i?" o; do
+    case "${o}" in
+        i)
+            i="incremental build"
+            INC_BUILD=1
+            ;;
+    esac
+done
+shift $((OPTIND-1))
+
 JBSDK_VERSION=$1
 JDK_BUILD_NUMBER=$2
 build_number=$3
@@ -36,17 +44,28 @@ JCEF_PATH=${JCEF_PATH:=./jcef_linux_x64}

 source jb/project/tools/common.sh

+function do_configure {
+  sh configure \
+    --disable-warnings-as-errors \
+    $WITH_DEBUG_LEVEL \
+    --with-vendor-name="${VENDOR_NAME}" \
+    --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+    --with-jvm-features=shenandoahgc \
+    --with-version-pre= \
+    --with-version-build=${JDK_BUILD_NUMBER} \
+    --with-version-opt=b${build_number} \
+    $WITH_IMPORT_MODULES \
+    --enable-cds=yes || do_exit $?
+}
+
 function create_jbr {

  JBR_BUNDLE=jbr_${bundle_type}

  case "${bundle_type}" in
-  "jfx" | "jcef" | "dcevm" | "nomod" | "fd")
+  "jcef" | "dcevm" | "nomod" | "fd")
    JBR_BASE_NAME=jbr_${bundle_type}-${JBSDK_VERSION}
    ;;
-  "jfx_jcef")
-    JBR_BASE_NAME=jbr-${JBSDK_VERSION}
-    ;;
  *)
    echo "***ERR*** bundle was not specified" && do_exit 1
    ;;
@@ -80,19 +99,10 @@ WITH_DEBUG_LEVEL="--with-debug-level=release"
 RELEASE_NAME=linux-x86_64-normal-server-release
 JBSDK=${JBRSDK_BASE_NAME}-linux-x64-b${build_number}
 case "$bundle_type" in
-  "jfx")
-    git apply -p0 < jb/project/tools/patches/add_jfx_module.patch || do_exit $?
-    do_reset_changes=1
-    ;;
  "jcef")
    git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
    do_reset_changes=1
    ;;
-  "jfx_jcef")
-    git apply -p0 < jb/project/tools/patches/add_jfx_module.patch || do_exit $?
-    git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
-    do_reset_changes=1
-    ;;
  "dcevm")
    HEAD_REVISION=$(git rev-parse HEAD)
    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
@@ -115,19 +125,11 @@ case "$bundle_type" in
    ;;
 esac

-sh configure \
-  --disable-warnings-as-errors \
-  $WITH_DEBUG_LEVEL \
-  --with-vendor-name="${VENDOR_NAME}" \
-  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
-  --with-jvm-features=shenandoahgc \
-  --with-version-pre= \
-  --with-version-build=${JDK_BUILD_NUMBER} \
-  --with-version-opt=b${build_number} \
-  $WITH_IMPORT_MODULES \
-  --enable-cds=yes || do_exit $?
-
-make clean images CONF=$RELEASE_NAME || do_exit $?
+if [ -z "$INC_BUILD" ]; then
+  do_configure || do_exit $?
+  make clean CONF=$RELEASE_NAME || do_exit $?
+fi
+make images CONF=$RELEASE_NAME || do_exit $?

 JSDK=build/${RELEASE_NAME}/images/jdk

--- a/jb/project/tools/linux/scripts/mkimages_x86.sh
+++ b/jb/project/tools/linux/scripts/mkimages_x86.sh
@@ -6,7 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to bu built; possible values:
 #                        jcef - the bundles 1) jbr with jcef+javafx, 2) jbrsdk and 3) test will be created
-#                        jfx  - the bundle 1) jbr with javafx only will be created
 #
 # jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
 # jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
--- a/jb/project/tools/mac/scripts/mkimages.sh
+++ b/jb/project/tools/mac/scripts/mkimages.sh
@@ -6,8 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to be built; possible values:
 #                        jcef - the release bundles with jcef
-#                        jfx - the release bundles with javafx
-#                        jcef_jfx - the release bundles with jcef and javafx
 #                        dcevm - the release bundles with dcevm patches
 #                        nomod - the release bundles without any additional modules (jcef)
 #                        fd - the fastdebug bundles which also include the jcef module
@@ -26,6 +24,16 @@
 #   JCEF_PATH - specifies the path to the directory with JCEF binaries.
 #               By default JCEF binaries should be located in ./jcef_mac

+while getopts ":i?" o; do
+    case "${o}" in
+        i)
+            i="incremental build"
+            INC_BUILD=1
+            ;;
+    esac
+done
+shift $((OPTIND-1))
+
 JBSDK_VERSION=$1
 JDK_BUILD_NUMBER=$2
 build_number=$3
@@ -39,29 +47,55 @@ architecture=${architecture:=x64}

 source jb/project/tools/common.sh

-function copyJNF {
-  __contents_dir=$1
-    # we can't notarize this library as usual framework (with headers and tbd-file)
-    # but single library notarizes correctly
-    mkdir -p ${__contents_dir}/Frameworks/JavaNativeFoundation.framework/Resources
-    cp -p Frameworks/JavaNativeFoundation.framework/JavaNativeFoundation \
-      ${__contents_dir}/Frameworks/JavaNativeFoundation.framework || do_exit $?
-    cp -p Frameworks/JavaNativeFoundation.framework/Resources/Info.plist \
-      ${__contents_dir}/Frameworks/JavaNativeFoundation.framework/Resources || do_exit $?
-    # unsign JavaNativeFoundation binary (otherwise notarization will fail)
-    codesign --remove-signature ${__contents_dir}/Frameworks/JavaNativeFoundation.framework/JavaNativeFoundation || do_exit $?
+function do_configure {
+  if [[ "${architecture}" == *aarch64* ]]; then
+    # NOTE: aot, cds aren't supported yet
+    WITH_JVM_FEATURES="--with-jvm-features=-aot"
+    if [[ "${enable_aot}" == *enable_aot* ]]; then
+      echo "Enable unstable jvm feature: AOT"
+      WITH_JVM_FEATURES=""
+    fi
+    sh configure \
+    --disable-warnings-as-errors \
+    $WITH_DEBUG_LEVEL \
+    --with-vendor-name="${VENDOR_NAME}" \
+    --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+    --with-jvm-features=shenandoahgc \
+    --with-version-pre= \
+    --with-version-build=${JDK_BUILD_NUMBER} \
+    --with-version-opt=b${build_number} \
+    $WITH_IMPORT_MODULES \
+    --with-boot-jdk=`/usr/libexec/java_home -v 11` \
+    --disable-hotspot-gtest --disable-javac-server --disable-full-docs --disable-manpages \
+    --enable-cds=no \
+    $WITH_JVM_FEATURES \
+    --with-extra-cflags="-F$(pwd)/Frameworks" \
+    --with-extra-cxxflags="-F$(pwd)/Frameworks" \
+    --with-extra-ldflags="-F$(pwd)/Frameworks" || do_exit $?
+  else
+    sh configure \
+      --disable-warnings-as-errors \
+      $WITH_DEBUG_LEVEL \
+      --with-vendor-name="${VENDOR_NAME}" \
+      --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+      --with-jvm-features=shenandoahgc \
+      --with-version-pre= \
+      --with-version-build=${JDK_BUILD_NUMBER} \
+      --with-version-opt=b${build_number} \
+      $WITH_IMPORT_MODULES \
+      --with-boot-jdk=`/usr/libexec/java_home -v 11` \
+      --enable-cds=yes || do_exit $?
+  fi
 }
+
 function create_jbr {

  JBR_BUNDLE=jbr_${bundle_type}

  case "${bundle_type}" in
-  "jfx" | "jcef" | "dcevm" | "nomod" | "fd")
+  "jcef" | "dcevm" | "nomod" | "fd")
    JBR_BASE_NAME=jbr_${bundle_type}-${JBSDK_VERSION}
    ;;
-  "jfx_jcef")
-    JBR_BASE_NAME=jbr-${JBSDK_VERSION}
-    ;;
  *)
    echo "***ERR*** bundle was not specified" && do_exit 1
    ;;
@@ -95,11 +129,6 @@ function create_jbr {
  cp ${BASE_DIR}/${JBRSDK_BUNDLE}/Contents/Info.plist ${JRE_CONTENTS}

  rm -rf ${JRE_CONTENTS}/Frameworks || do_exit $?
-  if [[ "${architecture}" == *aarch64* ]]; then
-    # we can't notarize this library as usual framework (with headers and tbd-file)
-    # but single library notarizes correctly
-    copyJNF ${JRE_CONTENTS}
-  fi
  if [[ "${bundle_type}" == *jcef* ]] || [[ "${bundle_type}" == *dcevm* ]] || [[ "${bundle_type}" == fd ]]; then
    cp -a ${JCEF_PATH}/Frameworks ${JRE_CONTENTS} || do_exit $?
  fi
@@ -122,19 +151,10 @@ CONF_NAME=macosx-${CONF_ARCHITECTURE}-normal-server-release

 JBSDK=${JBRSDK_BASE_NAME}-osx-${architecture}-b${build_number}
 case "$bundle_type" in
-  "jfx")
-    git apply -p0 < jb/project/tools/patches/add_jfx_module.patch || do_exit $?
-    do_reset_changes=1
-    ;;
  "jcef")
    git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
    do_reset_changes=1
    ;;
-  "jfx_jcef")
-    git apply -p0 < jb/project/tools/patches/add_jfx_module.patch || do_exit $?
-    git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
-    do_reset_changes=1
-    ;;
  "dcevm")
    HEAD_REVISION=$(git rev-parse HEAD)
    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
@@ -157,45 +177,10 @@ case "$bundle_type" in
    ;;
 esac

-if [[ "${architecture}" == *aarch64* ]]; then
-  # NOTE: aot, cds aren't supported yet
-  WITH_JVM_FEATURES="--with-jvm-features=-aot"
-  if [[ "${enable_aot}" == *enable_aot* ]]; then
-    echo "Enable unstable jvm feature: AOT"
-    WITH_JVM_FEATURES=""
-  fi
-  sh configure \
-  --disable-warnings-as-errors \
-  $WITH_DEBUG_LEVEL \
-  --with-vendor-name="${VENDOR_NAME}" \
-  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
-  --with-jvm-features=shenandoahgc \
-  --with-version-pre= \
-  --with-version-build=${JDK_BUILD_NUMBER} \
-  --with-version-opt=b${build_number} \
-  $WITH_IMPORT_MODULES \
-  --with-boot-jdk=`/usr/libexec/java_home -v 11` \
-  --disable-hotspot-gtest --disable-javac-server --disable-full-docs --disable-manpages \
-  --enable-cds=no \
-  $WITH_JVM_FEATURES \
-  --with-extra-cflags="-F$(pwd)/Frameworks" \
-  --with-extra-cxxflags="-F$(pwd)/Frameworks" \
-  --with-extra-ldflags="-F$(pwd)/Frameworks" || do_exit $?
-else
-  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_IMPORT_MODULES \
-    --with-boot-jdk=`/usr/libexec/java_home -v 11` \
-    --enable-cds=yes || do_exit $?
+if [ -z "$INC_BUILD" ]; then
+  do_configure || do_exit $?
+  make clean CONF=$RELEASE_NAME || do_exit $?
 fi
-
-make clean CONF=$CONF_NAME || do_exit $?
 make images CONF=$CONF_NAME || do_exit $?

 JSDK=build/${CONF_NAME}/images/jdk-bundle
@@ -211,9 +196,6 @@ if [[ "${bundle_type}" == *jcef* ]] || [[ "${bundle_type}" == *dcevm* ]] || [[ "
 fi
 if [ "${bundle_type}" == "jcef" ] || [ "${bundle_type}" == "fd" ]; then
  echo Creating $JBSDK.tar.gz ...
-  if [[ "${architecture}" == *aarch64* ]]; then
-    copyJNF $BASE_DIR/$JBRSDK_BUNDLE/Contents
-  fi
  sed 's/JBR/JBRSDK/g' ${BASE_DIR}/${JBRSDK_BUNDLE}/Contents/Home/release > release
  mv release ${BASE_DIR}/${JBRSDK_BUNDLE}/Contents/Home/release
  [ -f "${JBSDK}.tar.gz" ] && rm "${JBSDK}.tar.gz"
--- a/jb/project/tools/mac/scripts/sign.sh
+++ b/jb/project/tools/mac/scripts/sign.sh
@@ -26,8 +26,7 @@ log "Signing libraries and executables..."
 # -perm +111 searches for executables
 for f in \
   "Contents/Home/bin" \
-   "Contents/Home/lib" \
-   "Contents/Frameworks"; do
+   "Contents/Home/lib"; do
  if [ -d "$APP_DIRECTORY/$f" ]; then
    find "$APP_DIRECTORY/$f" \
      -type f \( -name "*.jnilib" -o -name "*.dylib" -o -name "*.so" -o -perm +111 \) \
@@ -37,6 +36,20 @@ for f in \
  fi
 done

+if [ -d "$APP_DIRECTORY/Contents/Frameworks" ]; then
+  log "Signing frameworks..."
+  for f in $APP_DIRECTORY/Contents/Frameworks/*; do
+    find "$f" \
+      -type f \( -name "*.jnilib" -o -name "*.dylib" -o -name "*.so" \) \
+      -exec codesign --timestamp --force \
+      -v -s "$JB_CERT" \
+      --entitlements entitlements.xml {} \;
+    codesign --timestamp --force \
+      -v -s "$JB_CERT" --options=runtime \
+      --entitlements entitlements.xml "$f"
+  done
+fi
+
 log "Signing libraries in jars in $PWD"

 # todo: add set -euo pipefail; into the inner sh -c
--- a/jb/project/tools/patches/add_jcef_module.patch
+++ b/jb/project/tools/patches/add_jcef_module.patch
@@ -1,18 +1,18 @@
 diff --git modules.list modules.list
-index e23d793..368d022 100644
+index 33375b527c4..76539cbc0e0 100644
 --- modules.list
 +++ modules.list
-@@ -54,4 +54,7 @@ jdk.security.jgss,
- jdk.unsupported,
+@@ -55,4 +55,7 @@ jdk.unsupported,
 jdk.xml.dom,
 jdk.zipfs,
-jdk.hotspot.agent
-+jdk.hotspot.agent,
+ jdk.hotspot.agent,
+-jdk.jcmd
+jdk.jcmd,
 +jcef,
 +gluegen.rt,
 +jogl.all
 diff --git src/java.desktop/share/classes/module-info.java src/java.desktop/share/classes/module-info.java
-index b663b38..3e9acdc 100644
+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 {
--- a/jb/project/tools/patches/add_jcef_module_winaarch64.patch
+++ b/jb/project/tools/patches/add_jcef_module_winaarch64.patch
@@ -0,0 +1,27 @@
+diff --git modules.list modules.list
+index 33375b527c4..76539cbc0e0 100644
+--- modules.list
+++ modules.list
+@@ -55,4 +55,5 @@ jdk.unsupported,
+ jdk.xml.dom,
+ jdk.zipfs,
+ jdk.hotspot.agent,
+-jdk.jcmd
+jdk.jcmd,
+jcef
+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 +109,10 @@ module java.desktop {
+     // see make/GensrcModuleInfo.gmk
+     exports sun.awt to
+         jdk.accessibility,
+-        jdk.unsupported.desktop;
+        jdk.unsupported.desktop,
+        jcef;
+
+    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/add_jfx_module.patch
+++ b/jb/project/tools/patches/add_jfx_module.patch
@@ -1,18 +0,0 @@
-diff --git modules.list modules.list
-index e23d793ca61..14b9a6c8e50 100644
--- modules.list
-+++ modules.list
-@@ -20,6 +20,13 @@ java.sql.rowset,
- java.transaction.xa,
- java.xml,
- java.xml.crypto,
-+javafx.base,
-+javafx.controls,
-+javafx.fxml,
-+javafx.graphics,
-+javafx.media,
-+javafx.swing,
-+javafx.web,
- jdk.accessibility,
- jdk.aot,
- jdk.attach,
--- 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-Support-for-Concurrent-Mark-Sweep-CMS-collector.patch
+++ b/jb/project/tools/patches/dcevm/0003-Support-for-Concurrent-Mark-Sweep-CMS-collector.patch
@@ -1,7 +1,7 @@
-From dcf2c02f9ce950170b0e448b8ef3aceb19732a86 Mon Sep 17 00:00:00 2001
+From 049d83cfb1db63a0c20cd53696686a7ae11be824 Mon Sep 17 00:00:00 2001
 From: skybber <lada.dvorak7@gmail.com>
 Date: Wed, 12 Dec 2018 19:38:28 +0100
-Subject: [PATCH 03/17] Support for Concurrent Mark Sweep (CMS) collector
+Subject: [PATCH 03/44] Support for Concurrent Mark Sweep (CMS) collector

 ---
 .../share/gc/cms/compactibleFreeListSpace.cpp | 139 ++++++++++++------
@@ -422,47 +422,47 @@ index 6b109fcd2e5..8c255d6d428 100644
         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 43d761cdbb2..14af1aad21b 100644
+index 92ce6c27b8a..41e82ae7a69 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
@@ -54,6 +54,7 @@
- #include "prims/jvmtiThreadState.inline.hpp"
- #include "utilities/events.hpp"
- #include "oops/constantPool.inline.hpp"
-+#include "gc/cms/cmsHeap.hpp"
- 
- Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
- Array<Method*>* VM_EnhancedRedefineClasses::_new_methods = NULL;
+ #include "prims/jvmtiThreadState.inline.hpp"
+ #include "utilities/events.hpp"
+ #include "oops/constantPool.inline.hpp"
+#include "gc/cms/cmsHeap.hpp"
+ 
+ Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
+ Array<Method*>* VM_EnhancedRedefineClasses::_new_methods = NULL;
@@ -416,13 +417,11 @@ 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);
+       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);
@@ -432,11 +431,6 @@ public:
-           //  FIXME: instance updates...
-           //guarantee(false, "instance updates!");
-           MarkSweep::update_fields(obj, src, new_klass->update_information());
-
-          if (size_diff > 0) {
-            HeapWord* dead_space = ((HeapWord *)obj) + obj->size();
-            CollectedHeap::fill_with_object(dead_space, size_diff);
-          }
-         }
-       } else {
-         obj->set_klass(obj->klass()->new_version());
+           //  FIXME: instance updates...
+           //guarantee(false, "instance updates!");
+           MarkSweep::update_fields(obj, src, new_klass->update_information());
+-
+-          if (size_diff > 0) {
+-            HeapWord* dead_space = ((HeapWord *)obj) + obj->size();
+-            CollectedHeap::fill_with_object(dead_space, size_diff);
+-          }
+         }
+       } else {
+         obj->set_klass(obj->klass()->new_version());
 diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
-index a11dfe48dd6..013ba213c00 100644
+index 4e2a3ff1083..e3cb44d8690 100644
 --- a/src/hotspot/share/runtime/arguments.cpp
 +++ b/src/hotspot/share/runtime/arguments.cpp
@@ -2045,14 +2045,14 @@ bool Arguments::check_gc_consistency() {
--- a/jb/project/tools/patches/dcevm/0004-Fix-class-cast-exception-on-redefinition-of-class-A-.patch
+++ b/jb/project/tools/patches/dcevm/0004-Fix-class-cast-exception-on-redefinition-of-class-A-.patch
@@ -1,7 +1,7 @@
-From 663ccc831cc21ffddc5bc035de2c72666df00a4e Mon Sep 17 00:00:00 2001
+From 199dbcfcc71ea6992970c9cf9cfeee6f13d2a600 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <vladimir.dvorak@mailprofiler.com>
 Date: Wed, 11 Mar 2020 14:19:34 +0100
-Subject: [PATCH 04/17] Fix class cast exception on redefinition of class A,
+Subject: [PATCH 04/44] Fix class cast exception on redefinition of class A,
 that is superclass of B that has anonymous class C

 ---
@@ -9,7 +9,7 @@ Subject: [PATCH 04/17] Fix class cast exception on redefinition of class A,
 1 file changed, 4 insertions(+), 1 deletion(-)

 diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index 312d9af2527..4312c2c4ca9 100644
+index e3724984aa5..b10e566b7c3 100644
 --- a/src/hotspot/share/oops/instanceKlass.cpp
 +++ b/src/hotspot/share/oops/instanceKlass.cpp
@@ -788,7 +788,10 @@ bool InstanceKlass::link_class_impl(bool throw_verifyerror, TRAPS) {
--- a/jb/project/tools/patches/dcevm/0005-HotswapAgent-integration.patch
+++ b/jb/project/tools/patches/dcevm/0005-HotswapAgent-integration.patch
@@ -1,7 +1,7 @@
-From 25cb9b5fa97749d3bc13dc6c848c7eb9cc1b66bb Mon Sep 17 00:00:00 2001
+From 238ef84478962cdba49b479803163b6e71f46914 Mon Sep 17 00:00:00 2001
 From: skybber <lada.dvorak7@gmail.com>
 Date: Wed, 14 Nov 2018 21:20:08 +0100
-Subject: [PATCH 05/17] HotswapAgent integration
+Subject: [PATCH 05/44] HotswapAgent integration

 It include:

@@ -37,7 +37,7 @@ old DCEVM
 make/launcher/Launcher-jdk.jartool.gmk        |  2 +
 make/launcher/Launcher-jdk.javadoc.gmk        |  3 +-
 make/launcher/Launcher-jdk.jcmd.gmk           | 13 +++-
- make/launcher/Launcher-jdk.jconsole.gmk       |  3 +-
+ make/launcher/Launcher-jdk.jconsole.gmk       |  5 +-
 make/launcher/Launcher-jdk.jdeps.gmk          |  3 +
 make/launcher/Launcher-jdk.jdi.gmk            |  1 +
 make/launcher/Launcher-jdk.jlink.gmk          |  5 +-
@@ -55,7 +55,7 @@ old DCEVM
 .../classes/com/sun/beans/package-info.java   | 26 +++++++
 .../com/sun/beans/util/package-info.java      | 26 +++++++
 .../share/classes/module-info.java            |  3 +
- 28 files changed, 209 insertions(+), 11 deletions(-)
+ 28 files changed, 210 insertions(+), 12 deletions(-)
 create mode 100644 src/java.desktop/share/classes/com/sun/beans/introspect/package-info.java
 create mode 100644 src/java.desktop/share/classes/com/sun/beans/package-info.java
 create mode 100644 src/java.desktop/share/classes/com/sun/beans/util/package-info.java
@@ -259,16 +259,18 @@ index 7117fa78059..761a52d8466 100644
 
 # Hook to include the corresponding custom file, if present.
 diff --git a/make/launcher/Launcher-jdk.jconsole.gmk b/make/launcher/Launcher-jdk.jconsole.gmk
-index 575b9e0595b..9b38683a489 100644
+index 575b9e0595b..2ec087d710f 100644
 --- a/make/launcher/Launcher-jdk.jconsole.gmk
 +++ b/make/launcher/Launcher-jdk.jconsole.gmk
-@@ -29,7 +29,8 @@ $(eval $(call SetupBuildLauncher, jconsole, \
+@@ -28,8 +28,9 @@ include LauncherCommon.gmk
+ $(eval $(call SetupBuildLauncher, jconsole, \
     MAIN_CLASS := sun.tools.jconsole.JConsole, \
     JAVA_ARGS := --add-opens java.base/java.io=jdk.jconsole \
- 		 -Djconsole.showOutputViewer \
+-		 -Djconsole.showOutputViewer \
 -		 -Djdk.attach.allowAttachSelf=true, \
-+		 -Djdk.attach.allowAttachSelf=true \
-+		 -XX:+DisableHotswapAgent, \
+      -Djconsole.showOutputViewer \
+      -Djdk.attach.allowAttachSelf=true \
+      -XX:+DisableHotswapAgent, \
     CFLAGS_windows := -DJAVAW, \
     LIBS_windows := user32.lib, \
 ))
@@ -392,10 +394,10 @@ index 82311e69fd6..bd39f8595b2 100644
     CFLAGS := -DENABLE_ARG_FILES, \
 ))
 diff --git a/src/hotspot/share/classfile/vmSymbols.hpp b/src/hotspot/share/classfile/vmSymbols.hpp
-index 41e9a84cd69..1f67eb202b5 100644
+index 17f7e720c95..0d0badeabd0 100644
 --- a/src/hotspot/share/classfile/vmSymbols.hpp
 +++ b/src/hotspot/share/classfile/vmSymbols.hpp
-@@ -342,6 +342,7 @@
+@@ -343,6 +343,7 @@
   /* common method and field names */                                                             \
   template(object_initializer_name,                   "<init>")                                   \
   template(class_initializer_name,                    "<clinit>")                                 \
@@ -417,10 +419,10 @@ index 0c24146ff00..9dc184d02f5 100644
                                                      !fd.is_static() &&
                                                      !m->is_object_initializer());
 diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
-index 013ba213c00..2b5ba619f43 100644
+index e3cb44d8690..36276741b5c 100644
 --- a/src/hotspot/share/runtime/arguments.cpp
 +++ b/src/hotspot/share/runtime/arguments.cpp
-@@ -3962,6 +3962,8 @@ jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
+@@ -3967,6 +3967,8 @@ jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
   // Set object alignment values.
   set_object_alignment();
 
@@ -429,7 +431,7 @@ index 013ba213c00..2b5ba619f43 100644
 #if !INCLUDE_CDS
   if (DumpSharedSpaces || RequireSharedSpaces) {
     jio_fprintf(defaultStream::error_stream(),
-@@ -4295,3 +4297,68 @@ bool Arguments::copy_expand_pid(const char* src, size_t srclen,
+@@ -4300,3 +4302,68 @@ bool Arguments::copy_expand_pid(const char* src, size_t srclen,
   *b = '\0';
   return (p == src_end); // return false if not all of the source was copied
 }
@@ -499,7 +501,7 @@ index 013ba213c00..2b5ba619f43 100644
 +
 +}
 diff --git a/src/hotspot/share/runtime/arguments.hpp b/src/hotspot/share/runtime/arguments.hpp
-index cc7f71a4404..b2bab2e1f44 100644
+index 5cb7f5c4bd8..d7fd03d079e 100644
 --- a/src/hotspot/share/runtime/arguments.hpp
 +++ b/src/hotspot/share/runtime/arguments.hpp
@@ -507,6 +507,9 @@ class Arguments : AllStatic {
@@ -513,7 +515,7 @@ index cc7f71a4404..b2bab2e1f44 100644
   static size_t max_heap_for_compressed_oops();
 
 diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
-index 7b061359c1d..fc0405b5df2 100644
+index 35b8205f7c7..4d6fe0034a3 100644
 --- a/src/hotspot/share/runtime/globals.hpp
 +++ b/src/hotspot/share/runtime/globals.hpp
@@ -32,6 +32,12 @@
@@ -529,7 +531,7 @@ index 7b061359c1d..fc0405b5df2 100644
 // The larger HeapWordSize for 64bit requires larger heaps
 // for the same application running in 64bit.  See bug 4967770.
 // The minimum alignment to a heap word size is done.  Other
-@@ -2678,8 +2684,10 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
+@@ -2687,8 +2693,10 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
                                                                             \
   product(bool, AllowEnhancedClassRedefinition, true,                       \
              "Allow enhanced class redefinition beyond swapping method "    \
--- a/jb/project/tools/patches/dcevm/0006-Support-for-Lambda-class-redefinition.patch
+++ b/jb/project/tools/patches/dcevm/0006-Support-for-Lambda-class-redefinition.patch
@@ -1,7 +1,7 @@
-From 28d352b4b7cda96a37f95d75cf576570271157e3 Mon Sep 17 00:00:00 2001
+From 2b6afed7b4bd890326b2cc7a3eaf3020e3f0fe44 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Sun, 4 Oct 2020 21:12:12 +0200
-Subject: [PATCH 06/17] Support for Lambda class redefinition
+Subject: [PATCH 06/44] Support for Lambda class redefinition

 ---
 .../share/classfile/classLoaderData.cpp       |  9 +++
@@ -15,7 +15,7 @@ Subject: [PATCH 06/17] Support for Lambda class redefinition
 8 files changed, 85 insertions(+), 10 deletions(-)

 diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
-index ab2615da0ed..1bc67adf5a7 100644
+index 3f75bffce8a..a901b4309b9 100644
 --- a/src/hotspot/share/classfile/classLoaderData.cpp
 +++ b/src/hotspot/share/classfile/classLoaderData.cpp
@@ -663,6 +663,15 @@ Dictionary* ClassLoaderData::create_dictionary() {
@@ -35,7 +35,7 @@ index ab2615da0ed..1bc67adf5a7 100644
 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 7e357929971..00a84610b43 100644
+index b5a7cf21c85..c4f617ab800 100644
 --- a/src/hotspot/share/classfile/classLoaderData.hpp
 +++ b/src/hotspot/share/classfile/classLoaderData.hpp
@@ -292,6 +292,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
@@ -47,10 +47,10 @@ index 7e357929971..00a84610b43 100644
 
   void unload();
 diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
-index e464b94b420..791b49c68ad 100644
+index 0059af83584..89375cd59fa 100644
 --- a/src/hotspot/share/classfile/systemDictionary.cpp
 +++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -971,12 +971,16 @@ InstanceKlass* SystemDictionary::parse_stream(Symbol* class_name,
+@@ -970,12 +970,16 @@ InstanceKlass* SystemDictionary::parse_stream(Symbol* class_name,
                                               Handle protection_domain,
                                               ClassFileStream* st,
                                               const InstanceKlass* host_klass,
@@ -67,7 +67,7 @@ index e464b94b420..791b49c68ad 100644
   if (host_klass != NULL) {
     // Create a new CLD for anonymous class, that uses the same class loader
     // as the host_klass
-@@ -1000,8 +1004,12 @@ InstanceKlass* SystemDictionary::parse_stream(Symbol* class_name,
+@@ -999,8 +1003,12 @@ InstanceKlass* SystemDictionary::parse_stream(Symbol* class_name,
                                                       protection_domain,
                                                       host_klass,
                                                       cp_patches,
@@ -81,7 +81,7 @@ index e464b94b420..791b49c68ad 100644
 
   if (host_klass != NULL && k != NULL) {
     // Anonymous classes must update ClassLoaderData holder (was host_klass loader)
-@@ -1844,7 +1852,7 @@ void SystemDictionary::remove_from_hierarchy(InstanceKlass* k) {
+@@ -1841,7 +1849,7 @@ void SystemDictionary::remove_from_hierarchy(InstanceKlass* k) {
   k->remove_from_sibling_list();
 }
 
@@ -91,10 +91,10 @@ index e464b94b420..791b49c68ad 100644
   constraints()->update_after_redefinition();
 }
 diff --git a/src/hotspot/share/classfile/systemDictionary.hpp b/src/hotspot/share/classfile/systemDictionary.hpp
-index 06f6c869d63..1dbbffa197f 100644
+index 8b5ba8546dd..0002abe6122 100644
 --- a/src/hotspot/share/classfile/systemDictionary.hpp
 +++ b/src/hotspot/share/classfile/systemDictionary.hpp
-@@ -304,6 +304,7 @@ public:
+@@ -307,6 +307,7 @@ public:
                         protection_domain,
                         st,
                         NULL, // host klass
@@ -102,7 +102,7 @@ index 06f6c869d63..1dbbffa197f 100644
                         NULL, // cp_patches
                         THREAD);
   }
-@@ -312,6 +313,7 @@ public:
+@@ -315,6 +316,7 @@ public:
                                      Handle protection_domain,
                                      ClassFileStream* st,
                                      const InstanceKlass* host_klass,
@@ -111,119 +111,119 @@ index 06f6c869d63..1dbbffa197f 100644
                                      TRAPS);
 
 diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 14af1aad21b..0b239b2ff6d 100644
+index 41e82ae7a69..b94caa39562 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
@@ -488,6 +488,8 @@ 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;
+     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;
@@ -750,12 +752,34 @@ 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();
- 
+     // 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();
+ 
@@ -1436,6 +1460,30 @@ 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];
+   }
+ }
+ 
+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];
@@ -1973,7 +2021,10 @@ 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.
+   // 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 a48e07e3a6a..3551b06ecde 100644
+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
+   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 af2ec48c2e1..7741328979f 100644
+index 8098b80baa6..5a5d5e98623 100644
 --- a/src/hotspot/share/prims/resolvedMethodTable.cpp
 +++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
-@@ -200,7 +200,7 @@ void ResolvedMethodTable::print() {
+@@ -203,7 +203,7 @@ void ResolvedMethodTable::print() {
 
 void ResolvedMethodTable::adjust_method_entries(bool * trace_name_printed) {
   assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
@@ -232,7 +232,7 @@ index af2ec48c2e1..7741328979f 100644
   for (int i = 0; i < _the_table->table_size(); ++i) {
     for (ResolvedMethodEntry* entry = _the_table->bucket(i);
          entry != NULL;
-@@ -271,6 +271,8 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+@@ -274,6 +274,8 @@ 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());
 
@@ -242,10 +242,10 @@ index af2ec48c2e1..7741328979f 100644
         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 2f14e01ce0d..d0e0367d8eb 100644
+index 5f9f93c6b4c..c35ef044e65 100644
 --- a/src/hotspot/share/prims/unsafe.cpp
 +++ b/src/hotspot/share/prims/unsafe.cpp
-@@ -818,6 +818,7 @@ Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
+@@ -820,6 +820,7 @@ Unsafe_DefineAnonymousClass_impl(JNIEnv *env,
                                                 host_domain,
                                                 &st,
                                                 InstanceKlass::cast(host_klass),
--- a/jb/project/tools/patches/dcevm/0007-Fix-no-original-bytecode-found-error-if-method-with-.patch
+++ b/jb/project/tools/patches/dcevm/0007-Fix-no-original-bytecode-found-error-if-method-with-.patch
@@ -1,7 +1,7 @@
-From 3b6c7d2f807857712df6fd51a36a5a906b705f57 Mon Sep 17 00:00:00 2001
+From d78e34a89b273508d3502d7456bf40b568edb3fd Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Sat, 23 May 2020 10:02:15 +0200
-Subject: [PATCH 07/17] Fix "no original bytecode found" error if method with
+Subject: [PATCH 07/44] Fix "no original bytecode found" error if method with
 bkp is missing

 Sometimes IDE can deploy class with erroneous method, such method has
@@ -28,10 +28,10 @@ index e377e36b88c..262ecc021b2 100644
 
 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 f367e658879..71bbd15a4f5 100644
+index aeafba285f0..026fe9234fb 100644
 --- a/src/hotspot/share/interpreter/interpreterRuntime.cpp
 +++ b/src/hotspot/share/interpreter/interpreterRuntime.cpp
-@@ -834,7 +834,7 @@ IRT_END
+@@ -819,7 +819,7 @@ IRT_END
 // Invokes
 
 IRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* thread, Method* method, address bcp))
@@ -41,10 +41,10 @@ index f367e658879..71bbd15a4f5 100644
 
 IRT_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 ed6f769bf1b..031f255e632 100644
+index 0a12f01536a..037ceef2c44 100644
 --- a/src/hotspot/share/oops/method.cpp
 +++ b/src/hotspot/share/oops/method.cpp
-@@ -1744,14 +1744,14 @@ bool CompressedLineNumberReadStream::read_pair() {
+@@ -1789,14 +1789,14 @@ bool CompressedLineNumberReadStream::read_pair() {
 
 #if INCLUDE_JVMTI
 
@@ -61,7 +61,7 @@ index ed6f769bf1b..031f255e632 100644
     ResourceMark rm;
     fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
   }
-@@ -1897,7 +1897,7 @@ BreakpointInfo::BreakpointInfo(Method* m, int bci) {
+@@ -1942,7 +1942,7 @@ BreakpointInfo::BreakpointInfo(Method* m, int bci) {
   _signature_index = m->signature_index();
   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
   if (_orig_bytecode == Bytecodes::_breakpoint)
@@ -70,7 +70,7 @@ index ed6f769bf1b..031f255e632 100644
   _next = NULL;
 }
 
-@@ -1906,7 +1906,7 @@ void BreakpointInfo::set(Method* method) {
+@@ -1951,7 +1951,7 @@ void BreakpointInfo::set(Method* method) {
   {
     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
     if (code == Bytecodes::_breakpoint)
@@ -80,7 +80,7 @@ index ed6f769bf1b..031f255e632 100644
   }
 #endif
 diff --git a/src/hotspot/share/oops/method.hpp b/src/hotspot/share/oops/method.hpp
-index 4533476ff8f..193e1845b23 100644
+index 4ac3e6e80de..9ff4f0e8036 100644
 --- a/src/hotspot/share/oops/method.hpp
 +++ b/src/hotspot/share/oops/method.hpp
@@ -230,7 +230,7 @@ class Method : public Metadata {
@@ -102,34 +102,34 @@ index 4533476ff8f..193e1845b23 100644
   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 0b239b2ff6d..aba99bb60fa 100644
+index b94caa39562..1fbba406087 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
@@ -1356,14 +1356,16 @@ 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);
+ 
+     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/0008-Replace-deleted-method-with-Universe-throw_no_such_m.patch
+++ b/jb/project/tools/patches/dcevm/0008-Replace-deleted-method-with-Universe-throw_no_such_m.patch
@@ -1,7 +1,7 @@
-From 102b7a0ba69c1411ec926985c79a36a2fc1978dd Mon Sep 17 00:00:00 2001
+From 7035df8436fdda697753f1af48c26701328f684a Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Sun, 24 May 2020 12:07:42 +0200
-Subject: [PATCH 08/17] Replace deleted method with
+Subject: [PATCH 08/44] Replace deleted method with
 Universe::throw_no_such_method_error

 ---
@@ -9,10 +9,10 @@ Subject: [PATCH 08/17] Replace deleted method with
 1 file changed, 14 insertions(+), 14 deletions(-)

 diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
-index 7741328979f..06581643c3b 100644
+index 5a5d5e98623..c7996df51bc 100644
 --- a/src/hotspot/share/prims/resolvedMethodTable.cpp
 +++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
-@@ -261,25 +261,25 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+@@ -264,25 +264,25 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
 
       if (old_method->is_old()) {
 
--- a/jb/project/tools/patches/dcevm/0009-Support-for-G1-gc.patch
+++ b/jb/project/tools/patches/dcevm/0009-Support-for-G1-gc.patch
@@ -1,11 +1,11 @@
-From a89a7aad1d44b540e4704332939d639e66392bd5 Mon Sep 17 00:00:00 2001
+From 7c0fb4d6401dd7f87e6985c514484ee9846bf447 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Fri, 12 Jun 2020 17:43:52 +0200
-Subject: [PATCH 09/17] Support for G1 gc
+Subject: [PATCH 09/44] Support for G1 gc

 ---
 src/hotspot/share/gc/g1/g1CollectedHeap.cpp   |  20 +++
- src/hotspot/share/gc/g1/g1CollectedHeap.hpp   |   3 +
+ src/hotspot/share/gc/g1/g1CollectedHeap.hpp   |   2 +
 src/hotspot/share/gc/g1/g1FullCollector.cpp   |  16 +-
 .../share/gc/g1/g1FullGCCompactTask.cpp       |  92 +++++++++-
 .../share/gc/g1/g1FullGCCompactTask.hpp       |  19 +++
@@ -26,15 +26,15 @@ Subject: [PATCH 09/17] Support for G1 gc
 .../prims/jvmtiEnhancedRedefineClasses.hpp    |   6 +-
 src/hotspot/share/runtime/arguments.cpp       |   4 +-
 src/hotspot/share/utilities/growableArray.hpp |   4 +
- 22 files changed, 628 insertions(+), 141 deletions(-)
+ 22 files changed, 627 insertions(+), 141 deletions(-)
 create mode 100644 src/hotspot/share/gc/shared/dcevmSharedGC.cpp
 create mode 100644 src/hotspot/share/gc/shared/dcevmSharedGC.hpp

 diff --git a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
-index dea8d9fdb0e..33664a30519 100644
+index 3b0e6eb6587..d33a5ff3a54 100644
 --- a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
 +++ b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
-@@ -2108,6 +2108,21 @@ public:
+@@ -2115,6 +2115,21 @@ public:
   }
 };
 
@@ -56,7 +56,7 @@ index dea8d9fdb0e..33664a30519 100644
 void G1CollectedHeap::object_iterate(ObjectClosure* cl) {
   IterateObjectClosureRegionClosure blk(cl);
   heap_region_iterate(&blk);
-@@ -2117,6 +2132,11 @@ void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const {
+@@ -2152,6 +2167,11 @@ void G1CollectedHeap::heap_region_iterate(HeapRegionClosure* cl) const {
   _hrm.iterate(cl);
 }
 
@@ -69,7 +69,7 @@ index dea8d9fdb0e..33664a30519 100644
                                                                  HeapRegionClaimer *hrclaimer,
                                                                  uint worker_id) const {
 diff --git a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
-index 8a171dc6b52..05a068bb2e0 100644
+index 1f2029ab1f0..39b05017b92 100644
 --- a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
 +++ b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
@@ -144,6 +144,7 @@ class G1CollectedHeap : public CollectedHeap {
@@ -80,15 +80,14 @@ index 8a171dc6b52..05a068bb2e0 100644
 
   // Other related classes.
   friend class HeapRegionClaimer;
-@@ -1116,6 +1117,8 @@ public:
- 
+@@ -1117,6 +1118,7 @@ public:
   // Iteration functions.
 
+   void object_iterate_parallel(ObjectClosure* cl, uint worker_id, HeapRegionClaimer* claimer);
 +  void object_par_iterate(ObjectClosure* cl);
-+
+ 
   // Iterate over all objects, calling "cl.do_object" on each.
   virtual void object_iterate(ObjectClosure* cl);
- 
 diff --git a/src/hotspot/share/gc/g1/g1FullCollector.cpp b/src/hotspot/share/gc/g1/g1FullCollector.cpp
 index 4362ee87e30..7b9496976b8 100644
 --- a/src/hotspot/share/gc/g1/g1FullCollector.cpp
@@ -1024,7 +1023,7 @@ index 8c255d6d428..71ed3cfcda8 100644
         oop(compaction_top)->init_mark_raw();
         assert(oop(compaction_top)->klass() != NULL, "should have a class");
 diff --git a/src/hotspot/share/memory/universe.cpp b/src/hotspot/share/memory/universe.cpp
-index d0a6d665aa0..3dc4cc1323c 100644
+index 9a633280118..2e4f597cf1f 100644
 --- a/src/hotspot/share/memory/universe.cpp
 +++ b/src/hotspot/share/memory/universe.cpp
@@ -210,6 +210,11 @@ void Universe::root_oops_do(OopClosure *oopClosure) {
@@ -1040,236 +1039,236 @@ index d0a6d665aa0..3dc4cc1323c 100644
   SystemDictionary::oops_do(oopClosure);
 }
 diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index aba99bb60fa..8b6fad2128e 100644
+index 1fbba406087..e67fc2dd58f 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
@@ -36,7 +36,6 @@
- #include "memory/metaspaceShared.hpp"
- #include "memory/resourceArea.hpp"
- #include "memory/iterator.inline.hpp"
-#include "gc/serial/markSweep.hpp"
- #include "oops/fieldStreams.hpp"
- #include "oops/klassVtable.hpp"
- #include "oops/oop.inline.hpp"
+ #include "memory/metaspaceShared.hpp"
+ #include "memory/resourceArea.hpp"
+ #include "memory/iterator.inline.hpp"
+-#include "gc/serial/markSweep.hpp"
+ #include "oops/fieldStreams.hpp"
+ #include "oops/klassVtable.hpp"
+ #include "oops/oop.inline.hpp"
@@ -55,6 +54,8 @@
- #include "utilities/events.hpp"
- #include "oops/constantPool.inline.hpp"
- #include "gc/cms/cmsHeap.hpp"
-+#include "gc/g1/g1CollectedHeap.hpp"
-+#include "gc/shared/dcevmSharedGC.hpp"
- 
- Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
- Array<Method*>* VM_EnhancedRedefineClasses::_new_methods = NULL;
+ #include "utilities/events.hpp"
+ #include "oops/constantPool.inline.hpp"
+ #include "gc/cms/cmsHeap.hpp"
+#include "gc/g1/g1CollectedHeap.hpp"
+#include "gc/shared/dcevmSharedGC.hpp"
+ 
+ Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
+ Array<Method*>* VM_EnhancedRedefineClasses::_new_methods = NULL;
@@ -78,7 +79,7 @@ Klass*      VM_EnhancedRedefineClasses::_the_class_oop = NULL;
- //  - class_defs class definition - either new class or redefined class
- //               note that this is not the final array of classes to be redefined
- //               we need to scan for all affected classes (e.g. subclasses) and
-//               caculcate redefinition for them as well.
-+//               calculate redefinition for them as well.
- // @param class_load_kind always jvmti_class_load_kind_redefine
- VM_EnhancedRedefineClasses::VM_EnhancedRedefineClasses(jint class_count, const jvmtiClassDefinition *class_defs, JvmtiClassLoadKind class_load_kind) :
-         VM_GC_Operation(Universe::heap()->total_collections(), GCCause::_heap_inspection, Universe::heap()->total_full_collections(), true) {
+ //  - class_defs class definition - either new class or redefined class
+ //               note that this is not the final array of classes to be redefined
+ //               we need to scan for all affected classes (e.g. subclasses) and
+-//               caculcate redefinition for them as well.
+//               calculate redefinition for them as well.
+ // @param class_load_kind always jvmti_class_load_kind_redefine
+ VM_EnhancedRedefineClasses::VM_EnhancedRedefineClasses(jint class_count, const jvmtiClassDefinition *class_defs, JvmtiClassLoadKind class_load_kind) :
+         VM_GC_Operation(Universe::heap()->total_collections(), GCCause::_heap_inspection, Universe::heap()->total_full_collections(), true) {
@@ -216,6 +217,13 @@ void VM_EnhancedRedefineClasses::mark_as_scavengable(nmethod* nm) {
-   }
- }
- 
-+void VM_EnhancedRedefineClasses::mark_as_scavengable_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);
-+  }
-+}
-+
- // TODO comment
- struct StoreBarrier {
-   // TODO: j10 review change ::oop_store -> HeapAccess<>::oop_store
+   }
+ }
+ 
+void VM_EnhancedRedefineClasses::mark_as_scavengable_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);
+  }
+}
+
+ // TODO comment
+ struct StoreBarrier {
+   // TODO: j10 review change ::oop_store -> HeapAccess<>::oop_store
@@ -430,7 +438,7 @@ public:
-           src->set_klass(obj->klass()->new_version());
-           //  FIXME: instance updates...
-           //guarantee(false, "instance updates!");
-          MarkSweep::update_fields(obj, src, new_klass->update_information());
-+          DcevmSharedGC::update_fields(obj, src, new_klass->update_information());
-         }
-       } else {
-         obj->set_klass(obj->klass()->new_version());
+           src->set_klass(obj->klass()->new_version());
+           //  FIXME: instance updates...
+           //guarantee(false, "instance updates!");
+-          MarkSweep::update_fields(obj, src, new_klass->update_information());
+          DcevmSharedGC::update_fields(obj, src, new_klass->update_information());
+         }
+       } else {
+         obj->set_klass(obj->klass()->new_version());
@@ -452,6 +460,10 @@ public:
- void VM_EnhancedRedefineClasses::doit() {
-   Thread *thread = Thread::current();
- 
-+  if (log_is_enabled(Info, redefine, class, timer)) {
-+    _timer_vm_op_doit.start();
-+  }
-+
- #if INCLUDE_CDS
-   if (UseSharedSpaces) {
-     // Sharing is enabled so we remap the shared readonly space to
+ void VM_EnhancedRedefineClasses::doit() {
+   Thread *thread = Thread::current();
+ 
+  if (log_is_enabled(Info, redefine, class, timer)) {
+    _timer_vm_op_doit.start();
+  }
+
+ #if INCLUDE_CDS
+   if (UseSharedSpaces) {
+     // Sharing is enabled so we remap the shared readonly space to
@@ -507,12 +519,31 @@ void VM_EnhancedRedefineClasses::doit() {
-     // mark such nmethod's as "scavengable".
-     // For now, mark all nmethod's as scavengable that are not scavengable already
-     if (ScavengeRootsInCode) {
-      CodeCache::nmethods_do(mark_as_scavengable);
-+      if (UseG1GC) {
-+        // this should work also for other GCs
-+        CodeCache::nmethods_do(mark_as_scavengable_g1);
-+      } else {
-+        CodeCache::nmethods_do(mark_as_scavengable);
-+      }
-     }
- 
-     Universe::heap()->ensure_parsability(false);
-    Universe::heap()->object_iterate(&objectClosure);
-+    if (UseG1GC) {
-+      if (log_is_enabled(Info, redefine, class, timer)) {
-+        _timer_heap_iterate.start();
-+      }
-+      G1CollectedHeap::heap()->object_par_iterate(&objectClosure);
-+      _timer_heap_iterate.stop();
-+    } else {
-+      if (log_is_enabled(Info, redefine, class, timer)) {
-+        _timer_heap_iterate.start();
-+      }
-+      Universe::heap()->object_iterate(&objectClosure);
-+      _timer_heap_iterate.stop();
-+    }
-+
-     Universe::root_oops_do(&oopClosureNoBarrier);
-+
-   }
-   log_trace(redefine, class, obsolete, metadata)("After updating instances");
- 
+     // mark such nmethod's as "scavengable".
+     // For now, mark all nmethod's as scavengable that are not scavengable already
+     if (ScavengeRootsInCode) {
+-      CodeCache::nmethods_do(mark_as_scavengable);
+      if (UseG1GC) {
+        // this should work also for other GCs
+        CodeCache::nmethods_do(mark_as_scavengable_g1);
+      } else {
+        CodeCache::nmethods_do(mark_as_scavengable);
+      }
+     }
+ 
+     Universe::heap()->ensure_parsability(false);
+-    Universe::heap()->object_iterate(&objectClosure);
+    if (UseG1GC) {
+      if (log_is_enabled(Info, redefine, class, timer)) {
+        _timer_heap_iterate.start();
+      }
+      G1CollectedHeap::heap()->object_par_iterate(&objectClosure);
+      _timer_heap_iterate.stop();
+    } else {
+      if (log_is_enabled(Info, redefine, class, timer)) {
+        _timer_heap_iterate.start();
+      }
+      Universe::heap()->object_iterate(&objectClosure);
+      _timer_heap_iterate.stop();
+    }
+
+     Universe::root_oops_do(&oopClosureNoBarrier);
+
+   }
+   log_trace(redefine, class, obsolete, metadata)("After updating instances");
+ 
@@ -565,11 +596,19 @@ void VM_EnhancedRedefineClasses::doit() {
- 
-   if (objectClosure.needs_instance_update()) {
-     // Do a full garbage collection to update the instance sizes accordingly
-+
-+    if (log_is_enabled(Info, redefine, class, timer)) {
-+      _timer_heap_full_gc.start();
-+    }
-+
-     Universe::set_redefining_gc_run(true);
-     notify_gc_begin(true);
-+    // TODO: check _metadata_GC_clear_soft_refs with ScavengeRootsInCode
-     Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection);
-     notify_gc_end();
-     Universe::set_redefining_gc_run(false);
-+
-+    _timer_heap_full_gc.stop();
-   }
- 
-   // Unmark Klass*s as "redefining"
+ 
+   if (objectClosure.needs_instance_update()) {
+     // Do a full garbage collection to update the instance sizes accordingly
+
+    if (log_is_enabled(Info, redefine, class, timer)) {
+      _timer_heap_full_gc.start();
+    }
+
+     Universe::set_redefining_gc_run(true);
+     notify_gc_begin(true);
+    // TODO: check _metadata_GC_clear_soft_refs with ScavengeRootsInCode
+     Universe::heap()->collect_as_vm_thread(GCCause::_heap_inspection);
+     notify_gc_end();
+     Universe::set_redefining_gc_run(false);
+
+    _timer_heap_full_gc.stop();
+   }
+ 
+   // Unmark Klass*s as "redefining"
@@ -617,6 +656,7 @@ void VM_EnhancedRedefineClasses::doit() {
-   }
- #endif
- 
-+  _timer_vm_op_doit.stop();
- }
- 
- // Cleanup - runs in JVM thread
+   }
+ #endif
+ 
+  _timer_vm_op_doit.stop();
+ }
+ 
+ // Cleanup - runs in JVM thread
@@ -640,16 +680,14 @@ void VM_EnhancedRedefineClasses::doit_epilogue() {
-   if (log_is_enabled(Info, redefine, class, timer)) {
-     // Used to have separate timers for "doit" and "all", but the timer
-     // overhead skewed the measurements.
-    jlong doit_time = _timer_rsc_phase1.milliseconds() +
-                      _timer_rsc_phase2.milliseconds();
-    jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time;
-+    jlong all_time = _timer_vm_op_prologue.milliseconds() + _timer_vm_op_doit.milliseconds();
- 
-     log_info(redefine, class, timer)
-       ("vm_op: all=" JLONG_FORMAT "  prologue=" JLONG_FORMAT "  doit=" JLONG_FORMAT,
-       all_time, _timer_vm_op_prologue.milliseconds(), doit_time);
-+       all_time, _timer_vm_op_prologue.milliseconds(), _timer_vm_op_doit.milliseconds());
-     log_info(redefine, class, timer)
-      ("redefine_single_class: phase1=" JLONG_FORMAT "  phase2=" JLONG_FORMAT,
-       _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds());
-+      ("doit: heap iterate=" JLONG_FORMAT "  fullgc=" JLONG_FORMAT,
-+       _timer_heap_iterate.milliseconds(), _timer_heap_full_gc.milliseconds());
-   }
- }
- 
+   if (log_is_enabled(Info, redefine, class, timer)) {
+     // Used to have separate timers for "doit" and "all", but the timer
+     // overhead skewed the measurements.
+-    jlong doit_time = _timer_rsc_phase1.milliseconds() +
+-                      _timer_rsc_phase2.milliseconds();
+-    jlong all_time = _timer_vm_op_prologue.milliseconds() + doit_time;
+    jlong all_time = _timer_vm_op_prologue.milliseconds() + _timer_vm_op_doit.milliseconds();
+ 
+     log_info(redefine, class, timer)
+       ("vm_op: all=" JLONG_FORMAT "  prologue=" JLONG_FORMAT "  doit=" JLONG_FORMAT,
+-       all_time, _timer_vm_op_prologue.milliseconds(), doit_time);
+       all_time, _timer_vm_op_prologue.milliseconds(), _timer_vm_op_doit.milliseconds());
+     log_info(redefine, class, timer)
+-      ("redefine_single_class: phase1=" JLONG_FORMAT "  phase2=" JLONG_FORMAT,
+-       _timer_rsc_phase1.milliseconds(), _timer_rsc_phase2.milliseconds());
+      ("doit: heap iterate=" JLONG_FORMAT "  fullgc=" JLONG_FORMAT,
+       _timer_heap_iterate.milliseconds(), _timer_heap_full_gc.milliseconds());
+   }
+ }
+ 
@@ -1398,7 +1436,7 @@ void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method) {
- // arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp.
- void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
-   if (!k->is_instance_klass()) {
-	return;
-+    return;
-   }
- 
-   HandleMark hm(_thread);
+ // arrayKlassOops. See Open Issues in jvmtiRedefineClasses.hpp.
+ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
+   if (!k->is_instance_klass()) {
+-	return;
+    return;
+   }
+ 
+   HandleMark hm(_thread);
@@ -1584,7 +1622,7 @@ class TransferNativeFunctionRegistration {
- 
-   // Recursively search the binary tree of possibly prefixed method names.
-   // Iteration could be used if all agents were well behaved. Full tree walk is
-  // more resilent to agents not cleaning up intermediate methods.
-+  // more resilient to agents not cleaning up intermediate methods.
-   // Branch at each depth in the binary tree is:
-   //    (1) without the prefix.
-   //    (2) with the prefix.
+ 
+   // Recursively search the binary tree of possibly prefixed method names.
+   // Iteration could be used if all agents were well behaved. Full tree walk is
+-  // more resilent to agents not cleaning up intermediate methods.
+  // more resilient to agents not cleaning up intermediate methods.
+   // Branch at each depth in the binary tree is:
+   //    (1) without the prefix.
+   //    (2) with the prefix.
@@ -1689,7 +1727,7 @@ void VM_EnhancedRedefineClasses::transfer_old_native_function_registrations(Inst
-   transfer.transfer_registrations(_matching_old_methods, _matching_methods_length);
- }
- 
-// DCEVM - it always deoptimases everything! (because it is very difficult to find only correct dependencies)
-+// DCEVM - it always deoptimizes everything! (because it is very difficult to find only correct dependencies)
- // Deoptimize all compiled code that depends on this class.
- //
- // If the can_redefine_classes capability is obtained in the onload
+   transfer.transfer_registrations(_matching_old_methods, _matching_methods_length);
+ }
+ 
+-// DCEVM - it always deoptimases everything! (because it is very difficult to find only correct dependencies)
+// DCEVM - it always deoptimizes everything! (because it is very difficult to find only correct dependencies)
+ // Deoptimize all compiled code that depends on this class.
+ //
+ // If the can_redefine_classes capability is obtained in the onload
@@ -1816,10 +1854,6 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
- 
-   HandleMark hm(THREAD);   // make sure handles from this call are freed
- 
-  if (log_is_enabled(Info, redefine, class, timer)) {
-    _timer_rsc_phase1.start();
-  }
-
-   InstanceKlass* new_class = new_class_oop;
-   InstanceKlass* the_class = InstanceKlass::cast(new_class_oop->old_version());
-   assert(the_class != NULL, "must have old version");
+ 
+   HandleMark hm(THREAD);   // make sure handles from this call are freed
+ 
+-  if (log_is_enabled(Info, redefine, class, timer)) {
+-    _timer_rsc_phase1.start();
+-  }
+-
+   InstanceKlass* new_class = new_class_oop;
+   InstanceKlass* the_class = InstanceKlass::cast(new_class_oop->old_version());
+   assert(the_class != NULL, "must have old version");
@@ -1874,7 +1908,6 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
-                              new_class->external_name(),
-                              java_lang_Class::classRedefinedCount(new_class->java_mirror()));
-   }
-  _timer_rsc_phase2.stop();
- } // end redefine_single_class()
- 
- 
+                              new_class->external_name(),
+                              java_lang_Class::classRedefinedCount(new_class->java_mirror()));
+   }
+-  _timer_rsc_phase2.stop();
+ } // end redefine_single_class()
+ 
+ 
@@ -2057,8 +2090,8 @@ static bool match_second(void* value, KlassPair elem) {
- // For each class to be redefined parse the bytecode and figure out the superclass and all interfaces.
- // First newly introduced classes (_class_defs) are scanned and then affected classed (_affected_klasses).
- // Affected flag is cleared (clear_redefinition_flag(Klass::MarkedAsAffected))
-// For each dependency create a KlassPair instance. Finnaly, affected classes (_affected_klasses) are sorted according to pairs.
-// TODO - the class file is potentionally parsed multiple times - introduce a cache?
-+// For each dependency create a KlassPair instance. Finally, affected classes (_affected_klasses) are sorted according to pairs.
-+// TODO - the class file is potentially parsed multiple times - introduce a cache?
- jvmtiError VM_EnhancedRedefineClasses::do_topological_class_sorting(TRAPS) {
-   ResourceMark mark(THREAD);
- 
+ // For each class to be redefined parse the bytecode and figure out the superclass and all interfaces.
+ // First newly introduced classes (_class_defs) are scanned and then affected classed (_affected_klasses).
+ // Affected flag is cleared (clear_redefinition_flag(Klass::MarkedAsAffected))
+-// For each dependency create a KlassPair instance. Finnaly, affected classes (_affected_klasses) are sorted according to pairs.
+-// TODO - the class file is potentionally parsed multiple times - introduce a cache?
+// For each dependency create a KlassPair instance. Finally, affected classes (_affected_klasses) are sorted according to pairs.
+// TODO - the class file is potentially parsed multiple times - introduce a cache?
+ jvmtiError VM_EnhancedRedefineClasses::do_topological_class_sorting(TRAPS) {
+   ResourceMark mark(THREAD);
+ 
 diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-index 3551b06ecde..62a0fbf54d4 100644
+index d8a11b51fe9..9755944d70b 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
@@ -86,9 +86,10 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
-   // Performance measurement support. These timers do not cover all
-   // the work done for JVM/TI RedefineClasses() but they do cover
-   // the heavy lifting.
-  elapsedTimer  _timer_rsc_phase1;
-  elapsedTimer  _timer_rsc_phase2;
-+  elapsedTimer  _timer_vm_op_doit;
-   elapsedTimer  _timer_vm_op_prologue;
-+  elapsedTimer  _timer_heap_iterate;
-+  elapsedTimer  _timer_heap_full_gc;
- 
-   // These routines are roughly in call order unless otherwise noted.
- 
+   // Performance measurement support. These timers do not cover all
+   // the work done for JVM/TI RedefineClasses() but they do cover
+   // the heavy lifting.
+-  elapsedTimer  _timer_rsc_phase1;
+-  elapsedTimer  _timer_rsc_phase2;
+  elapsedTimer  _timer_vm_op_doit;
+   elapsedTimer  _timer_vm_op_prologue;
+  elapsedTimer  _timer_heap_iterate;
+  elapsedTimer  _timer_heap_full_gc;
+ 
+   // These routines are roughly in call order unless otherwise noted.
+ 
@@ -115,6 +116,7 @@ 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 unpatch_bytecode(Method* method);
-   static void fix_invoke_method(Method* method);
- 
+ 
+   void rollback();
+   static void mark_as_scavengable(nmethod* nm);
+  static void mark_as_scavengable_g1(nmethod* nm);
+   static void unpatch_bytecode(Method* method);
+   static void fix_invoke_method(Method* method);
+ 
 diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
-index 2b5ba619f43..5053ad7ee61 100644
+index 36276741b5c..0db55d00bd3 100644
 --- a/src/hotspot/share/runtime/arguments.cpp
 +++ b/src/hotspot/share/runtime/arguments.cpp
@@ -2045,9 +2045,9 @@ bool Arguments::check_gc_consistency() {
@@ -1285,10 +1284,10 @@ index 2b5ba619f43..5053ad7ee61 100644
     }
   }
 diff --git a/src/hotspot/share/utilities/growableArray.hpp b/src/hotspot/share/utilities/growableArray.hpp
-index f37d94a0529..738d475aea6 100644
+index ea746e065fa..d13e64f3806 100644
 --- a/src/hotspot/share/utilities/growableArray.hpp
 +++ b/src/hotspot/share/utilities/growableArray.hpp
-@@ -532,6 +532,10 @@ template<class E> class GrowableArrayIterator : public StackObj {
+@@ -523,6 +523,10 @@ template<class E> class GrowableArrayIterator : public StackObj {
     assert(_array == rhs._array, "iterator belongs to different array");
     return _position != rhs._position;
   }
--- a/jb/project/tools/patches/dcevm/0010-Change-log-level-in-advanced-redefinition.patch
+++ b/jb/project/tools/patches/dcevm/0010-Change-log-level-in-advanced-redefinition.patch
@@ -1,7 +1,7 @@
-From 2c6512bb54400e3836a3c348c10c78557c1abbf5 Mon Sep 17 00:00:00 2001
+From 840e28ad947e63d97d40a5e05fdacc0bfd371962 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Sat, 13 Jun 2020 18:50:59 +0200
-Subject: [PATCH 10/17] Change log level in advanced redefinition
+Subject: [PATCH 10/44] 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
@@ -11,23 +11,23 @@ Subject: [PATCH 10/17] Change log level in advanced redefinition
 2 files changed, 3 insertions(+), 3 deletions(-)

 diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 8b6fad2128e..a8adfa5af47 100644
+index e67fc2dd58f..5be9bb74305 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
@@ -915,7 +915,7 @@ 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());
+  // 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 06581643c3b..10806bee29b 100644
+index c7996df51bc..082d3d26c34 100644
 --- a/src/hotspot/share/prims/resolvedMethodTable.cpp
 +++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
-@@ -270,7 +270,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+@@ -273,7 +273,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
         } else {
           newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
 
@@ -36,7 +36,7 @@ index 06581643c3b..10806bee29b 100644
 
           assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
           assert(newer_method != NULL, "method_with_idnum() should not be NULL");
-@@ -290,7 +290,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
+@@ -293,7 +293,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
 
         ResourceMark rm;
         if (!(*trace_name_printed)) {
--- a/jb/project/tools/patches/dcevm/0011-AllowEnhancedClassRedefinition-is-false-disabled-by-.patch
+++ b/jb/project/tools/patches/dcevm/0011-AllowEnhancedClassRedefinition-is-false-disabled-by-.patch
@@ -1,7 +1,7 @@
-From 9c8d44a088bfd73f9be3678110a67a5ed8954c8a Mon Sep 17 00:00:00 2001
+From 68c65981000d71555a529443831a18c9738c9566 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Tue, 6 Oct 2020 22:15:31 +0200
-Subject: [PATCH 11/17] AllowEnhancedClassRedefinition is false (disabled) by
+Subject: [PATCH 11/44] AllowEnhancedClassRedefinition is false (disabled) by
 default

 ---
@@ -9,10 +9,10 @@ Subject: [PATCH 11/17] AllowEnhancedClassRedefinition is false (disabled) by
 1 file changed, 1 insertion(+), 1 deletion(-)

 diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
-index fc0405b5df2..607a39449dc 100644
+index 4d6fe0034a3..1984b8c28f9 100644
 --- a/src/hotspot/share/runtime/globals.hpp
 +++ b/src/hotspot/share/runtime/globals.hpp
-@@ -2682,7 +2682,7 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
+@@ -2691,7 +2691,7 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
           "Use platform unstable time where supported for timestamps only") \
                                                                             \
--- a/jb/project/tools/patches/dcevm/0012-add-jvmtiEnhancedRedefineClasses.-to-CMakeLists.txt.patch
+++ b/jb/project/tools/patches/dcevm/0012-add-jvmtiEnhancedRedefineClasses.-to-CMakeLists.txt.patch
@@ -1,7 +1,7 @@
-From 69bc6c03ad25d485182d1b17f265a59ff98e3352 Mon Sep 17 00:00:00 2001
+From b7e705f79f0a6fcc486511a5b8d7007dde4feec0 Mon Sep 17 00:00:00 2001
 From: Artem Khvastunov <artem.khvastunov@jetbrains.com>
 Date: Tue, 14 Apr 2020 19:11:35 +0200
-Subject: [PATCH 12/17] add jvmtiEnhancedRedefineClasses.* to CMakeLists.txt
+Subject: [PATCH 12/44] add jvmtiEnhancedRedefineClasses.* to CMakeLists.txt

 ---
 jb/project/hotspot-cmake/CMakeLists.txt | 2 ++
--- a/jb/project/tools/patches/dcevm/0013-Set-HOTSPOT_VM_DISTRO-Dynamic-Code-Evolution.patch
+++ b/jb/project/tools/patches/dcevm/0013-Set-HOTSPOT_VM_DISTRO-Dynamic-Code-Evolution.patch
@@ -1,14 +1,14 @@
-From 5e66d1cd39dcae56adfa3a4785e8da47218d7b72 Mon Sep 17 00:00:00 2001
+From 7f887b3b4819fbbe79a8caaae0e4f175c1368f77 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Mon, 19 Oct 2020 20:00:04 +0200
-Subject: [PATCH 13/17] Set HOTSPOT_VM_DISTRO=Dynamic Code Evolution
+Subject: [PATCH 13/44] 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 bb9d863c992..e462ab57217 100644
+index f8945e435aa..30f6b825493 100644
 --- a/make/autoconf/version-numbers
 +++ b/make/autoconf/version-numbers
@@ -44,7 +44,7 @@ PRODUCT_NAME=OpenJDK
--- a/jb/project/tools/patches/dcevm/0014-Fix-G1-nmethod-registration.patch
+++ b/jb/project/tools/patches/dcevm/0014-Fix-G1-nmethod-registration.patch
@@ -1,7 +1,7 @@
-From 5b1408b47bd86a5bd2a4aa1f39705687efc73223 Mon Sep 17 00:00:00 2001
+From 01acfab08f6fb1c1a0db80915cacf8987021272c Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Sun, 11 Oct 2020 10:43:28 +0200
-Subject: [PATCH 14/17] Fix G1 nmethod registration
+Subject: [PATCH 14/44] Fix G1 nmethod registration

 ---
 .../prims/jvmtiEnhancedRedefineClasses.cpp    | 19 ++++++++++++++++---
@@ -9,63 +9,63 @@ Subject: [PATCH 14/17] Fix G1 nmethod registration
 2 files changed, 18 insertions(+), 4 deletions(-)

 diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index a8adfa5af47..4ee12b7021f 100644
+index 5be9bb74305..f4bde7504c8 100644
 --- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
@@ -217,7 +217,14 @@ 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);
+   }
+ }
+ 
+-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);
@@ -520,8 +527,9 @@ 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);
-       }
+     // 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);
+       }
@@ -544,6 +552,11 @@ 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");
- 
+ 
+     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 62a0fbf54d4..d00109a0b92 100644
+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);
- 
+ 
+   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/0015-Initialize-method-s-_new_version-_old_version-to-NUL.patch
+++ b/jb/project/tools/patches/dcevm/0015-Initialize-method-s-_new_version-_old_version-to-NUL.patch
@@ -1,14 +1,14 @@
-From c5bae0e9c9c0b0a6e05a966648fb2ddaf9a16564 Mon Sep 17 00:00:00 2001
+From ca37cdca38fa1dd08844767510fce418a8c49b9e Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Thu, 22 Oct 2020 20:15:20 +0200
-Subject: [PATCH 15/17] Initialize method's _new_version/_old_version to NULL
+Subject: [PATCH 15/44] 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 031f255e632..a9556ecf0c4 100644
+index 037ceef2c44..6b8e2198e55 100644
 --- a/src/hotspot/share/oops/method.cpp
 +++ b/src/hotspot/share/oops/method.cpp
@@ -83,7 +83,8 @@ Method* Method::allocate(ClassLoaderData* loader_data,
--- a/jb/project/tools/patches/dcevm/0016-Clear-dcevm-code-separation.patch
+++ b/jb/project/tools/patches/dcevm/0016-Clear-dcevm-code-separation.patch
@@ -1,7 +1,7 @@
-From 5504812403a0673c428fc5589cd94f2c3fea7616 Mon Sep 17 00:00:00 2001
+From 400fa82043b7b9589e1f77c43f6696b133fc1188 Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Fri, 23 Oct 2020 10:20:26 +0200
-Subject: [PATCH 16/17] Clear dcevm code separation
+Subject: [PATCH 16/44] Clear dcevm code separation

 ---
 src/hotspot/share/classfile/systemDictionary.cpp   |  4 ++--
@@ -15,10 +15,10 @@ Subject: [PATCH 16/17] Clear dcevm code separation
 8 files changed, 27 insertions(+), 17 deletions(-)

 diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
-index 791b49c68ad..011a14eab32 100644
+index 89375cd59fa..a61c342f5bd 100644
 --- a/src/hotspot/share/classfile/systemDictionary.cpp
 +++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -1152,7 +1152,7 @@ InstanceKlass* SystemDictionary::resolve_from_stream(Symbol* class_name,
+@@ -1147,7 +1147,7 @@ InstanceKlass* SystemDictionary::resolve_from_stream(Symbol* class_name,
     MutexLocker mu(SystemDictionary_lock, THREAD);
 
     Klass* check = find_class(h_name, k->class_loader_data());
@@ -27,7 +27,7 @@ index 791b49c68ad..011a14eab32 100644
   } );
 
   return k;
-@@ -2153,7 +2153,7 @@ void SystemDictionary::check_constraints(unsigned int d_hash,
+@@ -2149,7 +2149,7 @@ void SystemDictionary::check_constraints(unsigned int d_hash,
       // also hold array classes.
 
       assert(check->is_instance_klass(), "noninstance in systemdictionary");
@@ -93,10 +93,10 @@ index 9dc184d02f5..bff1c3627b0 100644
                  is_static ? "static" : "non-static", resolved_klass->external_name(), fd.name()->as_C_string(),
                 current_klass->external_name());
 diff --git a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
-index 8afe8985026..4e7b39406fa 100644
+index 61a406377ee..da9df7a21a2 100644
 --- a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
 +++ b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
-@@ -1467,7 +1467,7 @@ static InstanceKlass* create_new_instance_klass(InstanceKlass* ik, ClassFileStre
+@@ -1471,7 +1471,7 @@ static InstanceKlass* create_new_instance_klass(InstanceKlass* ik, ClassFileStre
                              NULL, // host klass
                              NULL, // cp_patches
                              ClassFileParser::INTERNAL, // internal visibility
@@ -106,7 +106,7 @@ index 8afe8985026..4e7b39406fa 100644
   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 4312c2c4ca9..7335f0cffc9 100644
+index b10e566b7c3..7557a84fbf3 100644
 --- a/src/hotspot/share/oops/instanceKlass.cpp
 +++ b/src/hotspot/share/oops/instanceKlass.cpp
@@ -178,7 +178,9 @@ bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
@@ -138,7 +138,7 @@ index 4312c2c4ca9..7335f0cffc9 100644
         wait = true;
       ol.waitUninterruptibly(CHECK);
     }
-@@ -3617,7 +3619,7 @@ void InstanceKlass::verify_on(outputStream* st) {
+@@ -3632,7 +3634,7 @@ void InstanceKlass::verify_on(outputStream* st) {
 
     guarantee(sib->is_klass(), "should be klass");
     // TODO: (DCEVM) explain
@@ -148,10 +148,10 @@ index 4312c2c4ca9..7335f0cffc9 100644
 
   // Verify implementor fields requires the Compile_lock, but this is sometimes
 diff --git a/src/hotspot/share/oops/method.cpp b/src/hotspot/share/oops/method.cpp
-index a9556ecf0c4..6c7edaca67e 100644
+index 6b8e2198e55..2af3e71635e 100644
 --- a/src/hotspot/share/oops/method.cpp
 +++ b/src/hotspot/share/oops/method.cpp
-@@ -2100,7 +2100,7 @@ void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
+@@ -2144,7 +2144,7 @@ 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) ???
@@ -174,7 +174,7 @@ index 60604c645ff..325bffb7ad0 100644
     }
   }
 diff --git a/src/hotspot/share/runtime/reflection.cpp b/src/hotspot/share/runtime/reflection.cpp
-index ed789b0bc2b..06f60855655 100644
+index ac233f3b373..ae0cb65969a 100644
 --- a/src/hotspot/share/runtime/reflection.cpp
 +++ b/src/hotspot/share/runtime/reflection.cpp
@@ -660,7 +660,7 @@ bool Reflection::verify_member_access(const Klass* current_class,
--- a/jb/project/tools/patches/dcevm/0017-Fix-metadataOnStack-bug.patch
+++ b/jb/project/tools/patches/dcevm/0017-Fix-metadataOnStack-bug.patch
@@ -1,7 +1,7 @@
-From a9bc3c0b7acfe8432f4f50362df3d8f95d7b5d9d Mon Sep 17 00:00:00 2001
+From 22608d7381bc606fa488389c3d4e56987abd166b Mon Sep 17 00:00:00 2001
 From: Vladimir Dvorak <lada.dvorak7@gmail.com>
 Date: Fri, 23 Oct 2020 11:07:40 +0200
-Subject: [PATCH 17/17] Fix metadataOnStack bug
+Subject: [PATCH 17/44] Fix metadataOnStack bug

 ---
 .../share/classfile/classLoaderData.cpp       |  7 +-
@@ -11,10 +11,10 @@ Subject: [PATCH 17/17] Fix metadataOnStack bug
 4 files changed, 41 insertions(+), 38 deletions(-)

 diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
-index 1bc67adf5a7..bba5ce0511f 100644
+index a901b4309b9..7b88f6b44d9 100644
 --- a/src/hotspot/share/classfile/classLoaderData.cpp
 +++ b/src/hotspot/share/classfile/classLoaderData.cpp
-@@ -1398,13 +1398,10 @@ bool ClassLoaderDataGraph::do_unloading(bool clean_previous_versions) {
+@@ -1401,13 +1401,10 @@ bool ClassLoaderDataGraph::do_unloading(bool clean_previous_versions) {
   // Klassesoto delete.
 
   // FIXME: dcevm - block asserts in MetadataOnStackMark
@@ -143,7 +143,7 @@ index 8da4ac6f92b..6d327ab98f2 100644
 
   static void record(Metadata* m);
 diff --git a/src/hotspot/share/prims/jvmtiRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
-index 1b2070d686f..1178c863c30 100644
+index aee84b1d7c5..3dd86d63a1f 100644
 --- a/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
 +++ b/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
@@ -199,7 +199,7 @@ void VM_RedefineClasses::doit() {
--- a/jb/project/tools/patches/dcevm/0018-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch
+++ b/jb/project/tools/patches/dcevm/0018-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch
@@ -1,26 +0,0 @@
-From dbce1c2db6bcb28327fd715d389c824805174690 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <lada.dvorak7@gmail.com>
-Date: Wed, 11 Nov 2020 18:45:15 +0100
-Subject: [PATCH 18/18] 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 325bffb7ad0..30752e37f1c 100644
--- a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-@@ -51,7 +51,7 @@ 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())));
-     }
-   }
-- 
-2.23.0
-
--- a/jb/project/tools/patches/dcevm/0018-Ignore-MetadataOnStackMark-if-redefining_gc_run.patch
+++ b/jb/project/tools/patches/dcevm/0018-Ignore-MetadataOnStackMark-if-redefining_gc_run.patch
@@ -0,0 +1,25 @@
+From 371093160151f400b149a5e5e4cd1acc89b1ab52 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Sun, 1 Nov 2020 21:19:00 +0100
+Subject: [PATCH 18/44] Ignore MetadataOnStackMark if redefining_gc_run
+
+---
+ src/hotspot/share/classfile/classLoaderData.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
+index 7b88f6b44d9..2f6329f3e4d 100644
+--- a/src/hotspot/share/classfile/classLoaderData.cpp
+++ b/src/hotspot/share/classfile/classLoaderData.cpp
+@@ -1404,7 +1404,7 @@ bool ClassLoaderDataGraph::do_unloading(bool clean_previous_versions) {
+   bool walk_all_metadata = clean_previous_versions &&
+                              JvmtiExport::has_redefined_a_class() &&
+                              InstanceKlass::has_previous_versions_and_reset();
+-  MetadataOnStackMark md_on_stack(walk_all_metadata, AllowEnhancedClassRedefinition);
+  MetadataOnStackMark md_on_stack(walk_all_metadata, Universe::is_redefining_gc_run());
+ 
+   // Save previous _unloading pointer for CMS which may add to unloading list before
+   // purging and we don't want to rewalk the previously unloaded class loader data.
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0019-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch
+++ b/jb/project/tools/patches/dcevm/0019-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch
@@ -0,0 +1,26 @@
+From 3151c71be433365e2d8ce5fb6e061b12fbca009a Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Wed, 11 Nov 2020 18:45:15 +0100
+Subject: [PATCH 19/44] 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 325bffb7ad0..30752e37f1c 100644
+--- a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
+@@ -51,7 +51,7 @@ 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())));
+     }
+   }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0020-Disable-AllowEnhancedClassRedefinition-in-flight-rec.patch
+++ b/jb/project/tools/patches/dcevm/0020-Disable-AllowEnhancedClassRedefinition-in-flight-rec.patch
@@ -0,0 +1,31 @@
+From 9a869a57205c3e0f75ea0c23f6c5dc4334e6ddd8 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 5 Feb 2021 23:30:49 +0100
+Subject: [PATCH 20/44] Disable AllowEnhancedClassRedefinition in flight
+ recorder
+
+---
+ src/hotspot/share/runtime/arguments.cpp | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
+index 0db55d00bd3..65839b842e2 100644
+--- a/src/hotspot/share/runtime/arguments.cpp
+++ b/src/hotspot/share/runtime/arguments.cpp
+@@ -3967,6 +3967,13 @@ jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
+   // Set object alignment values.
+   set_object_alignment();
+ 
+  if (FlightRecorder) {
+    if (AllowEnhancedClassRedefinition) {
+      warning("EnhancedClassRedefinition was disabled, it is not allowed in FlightRecorder.");
+      AllowEnhancedClassRedefinition = false;
+    }
+  }
+
+   setup_hotswap_agent();
+ 
+ #if !INCLUDE_CDS
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0021-JBR-3106-Check-InstanceKlass-has_nestmate_access_to-.patch
+++ b/jb/project/tools/patches/dcevm/0021-JBR-3106-Check-InstanceKlass-has_nestmate_access_to-.patch
@@ -0,0 +1,41 @@
+From a6b2a48880db25c3c8ce5bc3bae9040eda6f18f2 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 12 Feb 2021 12:33:11 +0100
+Subject: [PATCH 21/44] JBR-3106 Check InstanceKlass::has_nestmate_access_to
+ with active classes
+
+Dcevm can leave old host in nested class if nested class is not
+redefined together with host class
+---
+ src/hotspot/share/oops/instanceKlass.cpp | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
+index 7557a84fbf3..ed26b33466a 100644
+--- a/src/hotspot/share/oops/instanceKlass.cpp
+++ b/src/hotspot/share/oops/instanceKlass.cpp
+@@ -327,11 +327,21 @@ bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
+     return false;
+   }
+ 
+  // (DCEVM) cur_host can be old, decide accessibility based on active version
+  if (AllowEnhancedClassRedefinition) {
+    cur_host = InstanceKlass::cast(cur_host->active_version());
+  }
+
+   Klass* k_nest_host = k->nest_host(icce, CHECK_false);
+   if (k_nest_host == NULL) {
+     return false;
+   }
+ 
+  // (DCEVM) k_nest_host can be old, decide accessibility based on active version
+  if (AllowEnhancedClassRedefinition) {
+    k_nest_host = InstanceKlass::cast(k_nest_host->active_version());
+  }
+
+   bool access = (cur_host == k_nest_host);
+ 
+   if (log_is_enabled(Trace, class, nestmates)) {
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0022-JBR-3110-Fix-assert-in-MetadataOnStackMark.patch
+++ b/jb/project/tools/patches/dcevm/0022-JBR-3110-Fix-assert-in-MetadataOnStackMark.patch
@@ -0,0 +1,31 @@
+From 01b00e2df98dbcfc2e37c42017a545de5f29e852 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Sun, 7 Feb 2021 12:08:58 +0100
+Subject: [PATCH 22/44] JBR-3110 Fix assert in MetadataOnStackMark
+
+Fixed fastdebug tests crashes in redefine gc run
+---
+ src/hotspot/share/classfile/metadataOnStackMark.cpp | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/metadataOnStackMark.cpp b/src/hotspot/share/classfile/metadataOnStackMark.cpp
+index 9d7bdbde74b..66049f11629 100644
+--- a/src/hotspot/share/classfile/metadataOnStackMark.cpp
+++ b/src/hotspot/share/classfile/metadataOnStackMark.cpp
+@@ -49,10 +49,11 @@ NOT_PRODUCT(bool MetadataOnStackMark::_is_active = false;)
+ MetadataOnStackMark::MetadataOnStackMark(bool redefinition_walk, bool ignore) : _ignore(ignore) {
+   assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
+   assert(_used_buffers == NULL, "sanity check");
+-  assert(!_is_active, "MetadataOnStackMarks do not nest");
+-  NOT_PRODUCT(_is_active = true;)
+ 
+   if (!ignore) {
+    assert(!_is_active, "MetadataOnStackMarks do not nest");
+    NOT_PRODUCT(_is_active = true;)
+
+     Threads::metadata_handles_do(Metadata::mark_on_stack);
+ 
+     if (redefinition_walk) {
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0023-Code-cleanup.patch
+++ b/jb/project/tools/patches/dcevm/0023-Code-cleanup.patch
@@ -0,0 +1,78 @@
+From 214a02487be521857a088595f8568df7846acd62 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Fri, 12 Feb 2021 11:27:39 +0100
+Subject: [PATCH 23/44] Code cleanup
+
+- Rename confusing method name old_if_redefined to old_if_redefining
+- Remove unused is_redefining_gc_run
+---
+ src/hotspot/share/classfile/dictionary.cpp | 6 +++---
+ src/hotspot/share/classfile/dictionary.hpp | 2 +-
+ src/hotspot/share/memory/universe.hpp      | 5 -----
+ 3 files changed, 4 insertions(+), 9 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/dictionary.cpp b/src/hotspot/share/classfile/dictionary.cpp
+index 86dc1f26933..d347f572350 100644
+--- a/src/hotspot/share/classfile/dictionary.cpp
+++ b/src/hotspot/share/classfile/dictionary.cpp
+@@ -381,7 +381,7 @@ InstanceKlass* Dictionary::find(unsigned int hash, Symbol* name,
+   int index = hash_to_index(hash);
+   DictionaryEntry* entry = get_entry(index, hash, name);
+   if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) {
+-    return old_if_redefined(entry->instance_klass());
+    return old_if_redefining(entry->instance_klass());
+   } else {
+     return NULL;
+   }
+@@ -394,7 +394,7 @@ InstanceKlass* Dictionary::find_class(int index, unsigned int hash,
+   assert (index == index_for(name), "incorrect index?");
+ 
+   DictionaryEntry* entry = get_entry(index, hash, name);
+-  return old_if_redefined((entry != NULL) ? entry->instance_klass() : NULL);
+  return old_if_redefining((entry != NULL) ? entry->instance_klass() : NULL);
+ }
+ 
+ 
+@@ -406,7 +406,7 @@ InstanceKlass* Dictionary::find_shared_class(int index, unsigned int hash,
+   assert (index == index_for(name), "incorrect index?");
+ 
+   DictionaryEntry* entry = get_entry(index, hash, name);
+-  return old_if_redefined((entry != NULL) ? entry->instance_klass() : NULL);
+  return old_if_redefining((entry != NULL) ? entry->instance_klass() : NULL);
+ }
+ 
+ 
+diff --git a/src/hotspot/share/classfile/dictionary.hpp b/src/hotspot/share/classfile/dictionary.hpp
+index 5eaa741d500..f6e08e7bfd5 100644
+--- a/src/hotspot/share/classfile/dictionary.hpp
+++ b/src/hotspot/share/classfile/dictionary.hpp
+@@ -120,7 +120,7 @@ public:
+   void rollback_redefinition();
+ 
+   // (DCEVM) return old class if redefining in AllowEnhancedClassRedefinition, otherwise return "k"
+-  static InstanceKlass* old_if_redefined(InstanceKlass* k) {
+  static InstanceKlass* old_if_redefining(InstanceKlass* k) {
+     return (k != NULL && k->is_redefining()) ? ((InstanceKlass* )k->old_version()) : k;
+   }
+ };
+diff --git a/src/hotspot/share/memory/universe.hpp b/src/hotspot/share/memory/universe.hpp
+index b32db16b9cf..742dada0e8f 100644
+--- a/src/hotspot/share/memory/universe.hpp
+++ b/src/hotspot/share/memory/universe.hpp
+@@ -52,13 +52,8 @@ class LatestMethodCache : public CHeapObj<mtClass> {
+   Klass*                _klass;
+   int                   _method_idnum;
+ 
+-  static bool _is_redefining_gc_run;
+-
+  public:
+ 
+-   static bool is_redefining_gc_run()               { return _is_redefining_gc_run; }
+-   static void set_redefining_gc_run(bool b)        { _is_redefining_gc_run = b;    }
+-
+   LatestMethodCache()   { _klass = NULL; _method_idnum = -1; }
+   ~LatestMethodCache()  { _klass = NULL; _method_idnum = -1; }
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0024-JBR-3111-Update-class-in-all-dictionaries-where-it-w.patch
+++ b/jb/project/tools/patches/dcevm/0024-JBR-3111-Update-class-in-all-dictionaries-where-it-w.patch
@@ -0,0 +1,95 @@
+From 88d359a84fb3a7dd7556c91ed0e17dca5b8d7d25 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Sat, 13 Feb 2021 20:47:52 +0100
+Subject: [PATCH 24/44] JBR-3111 Update class in all dictionaries where it was
+ already defined
+
+This patch keeps compatibility with std redefinition, that does not
+create a new Klass, but modifies it, then it is modified in all
+dictionaries containing this class.
+---
+ src/hotspot/share/classfile/classLoaderData.cpp  | 9 +++++++++
+ src/hotspot/share/classfile/classLoaderData.hpp  | 3 +++
+ src/hotspot/share/classfile/dictionary.cpp       | 2 +-
+ src/hotspot/share/classfile/dictionary.hpp       | 2 +-
+ src/hotspot/share/classfile/systemDictionary.cpp | 4 +++-
+ 5 files changed, 17 insertions(+), 3 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
+index 2f6329f3e4d..68df33b6c40 100644
+--- a/src/hotspot/share/classfile/classLoaderData.cpp
+++ b/src/hotspot/share/classfile/classLoaderData.cpp
+@@ -1277,6 +1277,15 @@ void ClassLoaderDataGraph::rollback_redefinition() {
+   }
+ }
+ 
+// (DCEVM) - iterate over all classes in all dictionaries
+bool ClassLoaderDataGraph::dictionary_classes_do_update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass) {
+  bool ok = false;
+  FOR_ALL_DICTIONARY(cld) {
+    ok = cld->dictionary()->update_klass(name, k, old_klass) || ok;
+  }
+  return ok;
+}
+
+ // Walks all entries in the dictionary including entries initiated by this class loader.
+ void ClassLoaderDataGraph::dictionary_all_entries_do(void f(InstanceKlass*, ClassLoaderData*)) {
+   Thread* thread = Thread::current();
+diff --git a/src/hotspot/share/classfile/classLoaderData.hpp b/src/hotspot/share/classfile/classLoaderData.hpp
+index c4f617ab800..92f57dac23e 100644
+--- a/src/hotspot/share/classfile/classLoaderData.hpp
+++ b/src/hotspot/share/classfile/classLoaderData.hpp
+@@ -130,6 +130,9 @@ class ClassLoaderDataGraph : public AllStatic {
+   // Enhanced class redefinition
+   static void rollback_redefinition();
+ 
+  // Enhanced class redefinition
+  static bool dictionary_classes_do_update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass);
+
+   // Iterate all classes and their class loaders, including initiating class loaders.
+   static void dictionary_all_entries_do(void f(InstanceKlass*, ClassLoaderData*));
+ 
+diff --git a/src/hotspot/share/classfile/dictionary.cpp b/src/hotspot/share/classfile/dictionary.cpp
+index d347f572350..fd9ef491ba1 100644
+--- a/src/hotspot/share/classfile/dictionary.cpp
+++ b/src/hotspot/share/classfile/dictionary.cpp
+@@ -345,7 +345,7 @@ DictionaryEntry* Dictionary::get_entry(int index, unsigned int hash,
+ }
+ 
+ // (DCEVM) replace old_class by new class in dictionary
+-bool Dictionary::update_klass(unsigned int hash, Symbol* name, ClassLoaderData* loader_data, InstanceKlass* k, InstanceKlass* old_klass) {
+bool Dictionary::update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass) {
+   // There are several entries for the same class in the dictionary: One extra entry for each parent classloader of the classloader of the class.
+   bool found = false;
+   for (int index = 0; index < table_size(); index++) {
+diff --git a/src/hotspot/share/classfile/dictionary.hpp b/src/hotspot/share/classfile/dictionary.hpp
+index f6e08e7bfd5..2932cc9c320 100644
+--- a/src/hotspot/share/classfile/dictionary.hpp
+++ b/src/hotspot/share/classfile/dictionary.hpp
+@@ -115,7 +115,7 @@ 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);
+  bool update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass);
+ 
+   void rollback_redefinition();
+ 
+diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
+index a61c342f5bd..cf0a05176c8 100644
+--- a/src/hotspot/share/classfile/systemDictionary.cpp
+++ b/src/hotspot/share/classfile/systemDictionary.cpp
+@@ -1603,7 +1603,9 @@ void SystemDictionary::define_instance_class(InstanceKlass* k, InstanceKlass* ol
+   Dictionary* dictionary = loader_data->dictionary();
+   unsigned int d_hash = dictionary->compute_hash(name_h);
+   if (is_redefining) {
+-    bool ok = dictionary->update_klass(d_hash, name_h, loader_data, k, old_klass);
+    // Update all dictionaries containing old_class to new_class
+    // outcome must be same as result of standard redefinition, that does not create a new Klass
+    bool ok = ClassLoaderDataGraph::dictionary_classes_do_update_klass(name_h, k, old_klass);
+     assert (ok, "must have found old class and updated!");
+   }
+   check_constraints(d_hash, k, class_loader_h, !is_redefining, CHECK);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0025-JBR-3140-support-for-modularized-HotswapAgent.patch
+++ b/jb/project/tools/patches/dcevm/0025-JBR-3140-support-for-modularized-HotswapAgent.patch
@@ -0,0 +1,527 @@
+From cfdbad725c55a4ce45d407393a4591d8b8f333c9 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Thu, 18 Jun 2020 18:40:11 +0200
+Subject: [PATCH 25/44] JBR-3140 - support for modularized HotswapAgent
+
+Add -XX:HotswapAgent=[disabled,fatjar.core]
+---
+ make/launcher/Launcher-java.base.gmk          |  1 -
+ make/launcher/Launcher-java.rmi.gmk           |  2 -
+ make/launcher/Launcher-java.scripting.gmk     |  3 +-
+ make/launcher/Launcher-java.security.jgss.gmk |  3 --
+ make/launcher/Launcher-jdk.aot.gmk            |  2 -
+ make/launcher/Launcher-jdk.compiler.gmk       |  5 +-
+ make/launcher/Launcher-jdk.hotspot.agent.gmk  |  1 -
+ make/launcher/Launcher-jdk.jartool.gmk        |  2 -
+ make/launcher/Launcher-jdk.javadoc.gmk        |  3 +-
+ make/launcher/Launcher-jdk.jcmd.gmk           | 13 +----
+ make/launcher/Launcher-jdk.jdeps.gmk          |  3 --
+ make/launcher/Launcher-jdk.jdi.gmk            |  1 -
+ make/launcher/Launcher-jdk.jlink.gmk          |  5 +-
+ make/launcher/Launcher-jdk.jshell.gmk         |  1 -
+ make/launcher/Launcher-jdk.jstatd.gmk         |  1 -
+ make/launcher/Launcher-jdk.pack.gmk           |  1 -
+ make/launcher/Launcher-jdk.rmic.gmk           |  1 -
+ .../Launcher-jdk.scripting.nashorn.shell.gmk  |  3 +-
+ src/hotspot/share/runtime/arguments.cpp       | 48 +++++++++++--------
+ .../runtime/flags/jvmFlagConstraintList.cpp   | 23 +++++++++
+ .../runtime/flags/jvmFlagConstraintList.hpp   |  1 +
+ .../flags/jvmFlagConstraintsRuntime.cpp       | 10 ++++
+ .../flags/jvmFlagConstraintsRuntime.hpp       |  1 +
+ src/hotspot/share/runtime/globals.hpp         | 12 ++++-
+ 24 files changed, 81 insertions(+), 65 deletions(-)
+
+diff --git a/make/launcher/Launcher-java.base.gmk b/make/launcher/Launcher-java.base.gmk
+index 38ba29530d8..f6d4aa28fe6 100644
+--- a/make/launcher/Launcher-java.base.gmk
+++ b/make/launcher/Launcher-java.base.gmk
+@@ -52,7 +52,6 @@ endif
+ 
+ $(eval $(call SetupBuildLauncher, keytool, \
+     MAIN_CLASS := sun.security.tools.keytool.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+ 
+ ################################################################################
+diff --git a/make/launcher/Launcher-java.rmi.gmk b/make/launcher/Launcher-java.rmi.gmk
+index 07046232275..a69a90bcc81 100644
+--- a/make/launcher/Launcher-java.rmi.gmk
+++ b/make/launcher/Launcher-java.rmi.gmk
+@@ -27,10 +27,8 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, rmid, \
+     MAIN_CLASS := sun.rmi.server.Activation, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, rmiregistry, \
+     MAIN_CLASS := sun.rmi.registry.RegistryImpl, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+diff --git a/make/launcher/Launcher-java.scripting.gmk b/make/launcher/Launcher-java.scripting.gmk
+index cf100e20789..057d2bf3aca 100644
+--- a/make/launcher/Launcher-java.scripting.gmk
+++ b/make/launcher/Launcher-java.scripting.gmk
+@@ -27,6 +27,5 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jrunscript, \
+     MAIN_CLASS := com.sun.tools.script.shell.Main, \
+-    JAVA_ARGS := --add-modules ALL-DEFAULT \
+-        -XX:+DisableHotswapAgent, \
+    JAVA_ARGS := --add-modules ALL-DEFAULT, \
+ ))
+diff --git a/make/launcher/Launcher-java.security.jgss.gmk b/make/launcher/Launcher-java.security.jgss.gmk
+index 2b856bfccb4..7411e1a21c4 100644
+--- a/make/launcher/Launcher-java.security.jgss.gmk
+++ b/make/launcher/Launcher-java.security.jgss.gmk
+@@ -28,16 +28,13 @@ include LauncherCommon.gmk
+ ifeq ($(OPENJDK_TARGET_OS), windows)
+   $(eval $(call SetupBuildLauncher, kinit, \
+       MAIN_CLASS := sun.security.krb5.internal.tools.Kinit, \
+-      JAVA_ARGS := -XX:+DisableHotswapAgent, \
+   ))
+ 
+   $(eval $(call SetupBuildLauncher, klist, \
+       MAIN_CLASS := sun.security.krb5.internal.tools.Klist, \
+-      JAVA_ARGS := -XX:+DisableHotswapAgent, \
+   ))
+ 
+   $(eval $(call SetupBuildLauncher, ktab, \
+       MAIN_CLASS := sun.security.krb5.internal.tools.Ktab, \
+-      JAVA_ARGS := -XX:+DisableHotswapAgent, \
+   ))
+ endif
+diff --git a/make/launcher/Launcher-jdk.aot.gmk b/make/launcher/Launcher-jdk.aot.gmk
+index 2c52c31a555..10717a5e1c5 100644
+--- a/make/launcher/Launcher-jdk.aot.gmk
+++ b/make/launcher/Launcher-jdk.aot.gmk
+@@ -31,7 +31,6 @@ include LauncherCommon.gmk
+ $(eval $(call SetupBuildLauncher, jaotc, \
+     MAIN_CLASS := jdk.tools.jaotc.Main, \
+     EXTRA_JAVA_ARGS := -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI \
+-        -XX:+DisableHotswapAgent \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.aarch64=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.amd64=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.code=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+@@ -41,7 +40,6 @@ $(eval $(call SetupBuildLauncher, jaotc, \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.hotspot=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+     , \
+     JAVA_ARGS := --add-exports=jdk.internal.vm.ci/jdk.vm.ci.hotspot.aarch64=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+-        -XX:+DisableHotswapAgent \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.hotspot.amd64=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.hotspot.aarch64=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+         --add-exports=jdk.internal.vm.ci/jdk.vm.ci.hotspot.sparc=$(call CommaList, jdk.internal.vm.compiler  jdk.aot) \
+diff --git a/make/launcher/Launcher-jdk.compiler.gmk b/make/launcher/Launcher-jdk.compiler.gmk
+index 744969546de..f71c37adf74 100644
+--- a/make/launcher/Launcher-jdk.compiler.gmk
+++ b/make/launcher/Launcher-jdk.compiler.gmk
+@@ -27,14 +27,12 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, javac, \
+    MAIN_CLASS := com.sun.tools.javac.Main, \
+-   JAVA_ARGS := --add-modules ALL-DEFAULT \
+-       -XX:+DisableHotswapAgent, \
+   JAVA_ARGS := --add-modules ALL-DEFAULT, \
+    CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, serialver, \
+     MAIN_CLASS := sun.tools.serialver.SerialVer, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+ 
+@@ -43,7 +41,6 @@ ifeq ($(ENABLE_SJAVAC), yes)
+   # into any real images
+   $(eval $(call SetupBuildLauncher, sjavac, \
+       MAIN_CLASS := com.sun.tools.sjavac.Main, \
+-      JAVA_ARGS := -XX:+DisableHotswapAgent, \
+       CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+       OUTPUT_DIR := $(JDK_OUTPUTDIR)/bin, \
+   ))
+diff --git a/make/launcher/Launcher-jdk.hotspot.agent.gmk b/make/launcher/Launcher-jdk.hotspot.agent.gmk
+index 9f12b05b172..76da3600368 100644
+--- a/make/launcher/Launcher-jdk.hotspot.agent.gmk
+++ b/make/launcher/Launcher-jdk.hotspot.agent.gmk
+@@ -27,6 +27,5 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jhsdb, \
+     MAIN_CLASS := sun.jvm.hotspot.SALauncher, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     MACOSX_PRIVILEGED := true, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.jartool.gmk b/make/launcher/Launcher-jdk.jartool.gmk
+index 647d82b65b1..f74e82bfdae 100644
+--- a/make/launcher/Launcher-jdk.jartool.gmk
+++ b/make/launcher/Launcher-jdk.jartool.gmk
+@@ -27,10 +27,8 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jar, \
+     MAIN_CLASS := sun.tools.jar.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jarsigner, \
+     MAIN_CLASS := sun.security.tools.jarsigner.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.javadoc.gmk b/make/launcher/Launcher-jdk.javadoc.gmk
+index c3d2093be04..889028a2b17 100644
+--- a/make/launcher/Launcher-jdk.javadoc.gmk
+++ b/make/launcher/Launcher-jdk.javadoc.gmk
+@@ -27,7 +27,6 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, javadoc, \
+     MAIN_CLASS := jdk.javadoc.internal.tool.Main, \
+-    JAVA_ARGS := --add-modules ALL-DEFAULT \
+-        -XX:+DisableHotswapAgent, \
+    JAVA_ARGS := --add-modules ALL-DEFAULT, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.jcmd.gmk b/make/launcher/Launcher-jdk.jcmd.gmk
+index 761a52d8466..7117fa78059 100644
+--- a/make/launcher/Launcher-jdk.jcmd.gmk
+++ b/make/launcher/Launcher-jdk.jcmd.gmk
+@@ -30,7 +30,6 @@ $(eval $(call SetupBuildLauncher, jinfo, \
+     JAVA_ARGS := \
+         -Dsun.jvm.hotspot.debugger.useProcDebugger \
+         -Dsun.jvm.hotspot.debugger.useWindbgDebugger, \
+-        -XX:+DisableHotswapAgent, \
+     MACOSX_PRIVILEGED := true, \
+ ))
+ 
+@@ -38,36 +37,28 @@ $(eval $(call SetupBuildLauncher, jmap, \
+     MAIN_CLASS := sun.tools.jmap.JMap, \
+     JAVA_ARGS := \
+         -Dsun.jvm.hotspot.debugger.useProcDebugger \
+-        -Dsun.jvm.hotspot.debugger.useWindbgDebugger \
+-        -XX:+DisableHotswapAgent, \
+        -Dsun.jvm.hotspot.debugger.useWindbgDebugger, \
+     MACOSX_PRIVILEGED := true, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jps, \
+     MAIN_CLASS := sun.tools.jps.Jps, \
+-    JAVA_ARGS := \
+-        -XX:+DisableHotswapAgent, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jstack, \
+     MAIN_CLASS := sun.tools.jstack.JStack, \
+     JAVA_ARGS := \
+         -Dsun.jvm.hotspot.debugger.useProcDebugger \
+-        -Dsun.jvm.hotspot.debugger.useWindbgDebugger \
+-        -XX:+DisableHotswapAgent, \
+        -Dsun.jvm.hotspot.debugger.useWindbgDebugger, \
+     MACOSX_PRIVILEGED := true, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jstat, \
+     MAIN_CLASS := sun.tools.jstat.Jstat, \
+-    JAVA_ARGS := \
+-        -XX:+DisableHotswapAgent, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jcmd, \
+     MAIN_CLASS := sun.tools.jcmd.JCmd, \
+-    JAVA_ARGS := \
+-        -XX:+DisableHotswapAgent, \
+ ))
+ 
+ # Hook to include the corresponding custom file, if present.
+diff --git a/make/launcher/Launcher-jdk.jdeps.gmk b/make/launcher/Launcher-jdk.jdeps.gmk
+index 5448278dae7..217523c48cc 100644
+--- a/make/launcher/Launcher-jdk.jdeps.gmk
+++ b/make/launcher/Launcher-jdk.jdeps.gmk
+@@ -27,18 +27,15 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, javap, \
+     MAIN_CLASS := com.sun.tools.javap.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jdeps, \
+     MAIN_CLASS := com.sun.tools.jdeps.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jdeprscan, \
+     MAIN_CLASS := com.sun.tools.jdeprscan.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.jdi.gmk b/make/launcher/Launcher-jdk.jdi.gmk
+index 27bd448e3ae..fcce98cf430 100644
+--- a/make/launcher/Launcher-jdk.jdi.gmk
+++ b/make/launcher/Launcher-jdk.jdi.gmk
+@@ -27,5 +27,4 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jdb, \
+     MAIN_CLASS := com.sun.tools.example.debug.tty.TTY, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.jlink.gmk b/make/launcher/Launcher-jdk.jlink.gmk
+index 9e61edeb2c8..df2173996d7 100644
+--- a/make/launcher/Launcher-jdk.jlink.gmk
+++ b/make/launcher/Launcher-jdk.jlink.gmk
+@@ -27,21 +27,18 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jimage,\
+     MAIN_CLASS := jdk.tools.jimage.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DENABLE_ARG_FILES, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jlink,\
+     MAIN_CLASS := jdk.tools.jlink.internal.Main, \
+-    JAVA_ARGS :=  --add-modules ALL-DEFAULT \
+-        -XX:+DisableHotswapAgent, \
+    JAVA_ARGS :=  --add-modules ALL-DEFAULT, \
+     CFLAGS := -DENABLE_ARG_FILES \
+         -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+ 
+ $(eval $(call SetupBuildLauncher, jmod,\
+     MAIN_CLASS := jdk.tools.jmod.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DENABLE_ARG_FILES \
+         -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.jshell.gmk b/make/launcher/Launcher-jdk.jshell.gmk
+index 7287f8f998a..349eb88e9eb 100644
+--- a/make/launcher/Launcher-jdk.jshell.gmk
+++ b/make/launcher/Launcher-jdk.jshell.gmk
+@@ -27,6 +27,5 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jshell, \
+     MAIN_CLASS := jdk.internal.jshell.tool.JShellToolProvider, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.jstatd.gmk b/make/launcher/Launcher-jdk.jstatd.gmk
+index e1657910c67..e9286d63094 100644
+--- a/make/launcher/Launcher-jdk.jstatd.gmk
+++ b/make/launcher/Launcher-jdk.jstatd.gmk
+@@ -27,7 +27,6 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jstatd, \
+     MAIN_CLASS := sun.tools.jstatd.Jstatd, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+ 
+ # Hook to include the corresponding custom file, if present.
+diff --git a/make/launcher/Launcher-jdk.pack.gmk b/make/launcher/Launcher-jdk.pack.gmk
+index 64bbbb7c949..a93fd2a9017 100644
+--- a/make/launcher/Launcher-jdk.pack.gmk
+++ b/make/launcher/Launcher-jdk.pack.gmk
+@@ -28,7 +28,6 @@ include LauncherCommon.gmk
+ $(eval $(call SetupBuildLauncher, pack200, \
+     MAIN_MODULE := java.base, \
+     MAIN_CLASS := com.sun.java.util.jar.pack.Driver, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+ ))
+ 
+ ################################################################################
+diff --git a/make/launcher/Launcher-jdk.rmic.gmk b/make/launcher/Launcher-jdk.rmic.gmk
+index b8a55900b0e..d60c3d9b60b 100644
+--- a/make/launcher/Launcher-jdk.rmic.gmk
+++ b/make/launcher/Launcher-jdk.rmic.gmk
+@@ -27,6 +27,5 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, rmic, \
+     MAIN_CLASS := sun.rmi.rmic.Main, \
+-    JAVA_ARGS := -XX:+DisableHotswapAgent, \
+     CFLAGS := -DEXPAND_CLASSPATH_WILDCARDS, \
+ ))
+diff --git a/make/launcher/Launcher-jdk.scripting.nashorn.shell.gmk b/make/launcher/Launcher-jdk.scripting.nashorn.shell.gmk
+index bd39f8595b2..82311e69fd6 100644
+--- a/make/launcher/Launcher-jdk.scripting.nashorn.shell.gmk
+++ b/make/launcher/Launcher-jdk.scripting.nashorn.shell.gmk
+@@ -27,7 +27,6 @@ include LauncherCommon.gmk
+ 
+ $(eval $(call SetupBuildLauncher, jjs, \
+     MAIN_CLASS := jdk.nashorn.tools.jjs.Main, \
+-    JAVA_ARGS := --add-modules ALL-DEFAULT \
+-        -XX:+DisableHotswapAgent, \
+    JAVA_ARGS := --add-modules ALL-DEFAULT, \
+     CFLAGS := -DENABLE_ARG_FILES, \
+ ))
+diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
+index 65839b842e2..dce89a044e9 100644
+--- a/src/hotspot/share/runtime/arguments.cpp
+++ b/src/hotspot/share/runtime/arguments.cpp
+@@ -4315,11 +4315,17 @@ void Arguments::setup_hotswap_agent() {
+   if (DumpSharedSpaces)
+     return;
+ 
+-  if (!AllowEnhancedClassRedefinition)
+  if (HotswapAgent == NULL || strcmp(HotswapAgent, "disabled") == 0)
+     return;
+ 
+  // Force AllowEnhancedClassRedefinition if HA is enabled
+  AllowEnhancedClassRedefinition = true;
+
+  bool ha_fatjar = strcmp(HotswapAgent, "fatjar") == 0;
+  bool ha_core = strcmp(HotswapAgent, "core") == 0;
+
+   // Set HotswapAgent
+-  if (!DisableHotswapAgent) {
+  if (ha_fatjar || ha_core) {
+ 
+     char ext_path_str[JVM_MAXPATHLEN];
+ 
+@@ -4338,23 +4344,27 @@ void Arguments::setup_hotswap_agent() {
+       }
+     }
+     if (ext_path_length < JVM_MAXPATHLEN - 10) {
+-      jio_snprintf(ext_path_str + ext_path_length, sizeof(ext_path_str) - ext_path_length,
+-                   "%shotswap%shotswap-agent.jar", os::file_separator(), os::file_separator());
+-    }
+-
+-    int fd = ::open(ext_path_str, O_RDONLY);
+-    if (fd >= 0) {
+-      os::close(fd);
+-      size_t length = strlen(ext_path_str) + 1;
+-      char *options = NEW_C_HEAP_ARRAY(char,  length, mtArguments);
+-      jio_snprintf(options, length, "%s", ext_path_str);
+-      add_init_agent("instrument", ext_path_str, false);
+-      jio_fprintf(defaultStream::output_stream(), "Starting HotswapAgent '%s'\n", ext_path_str);
+-    }
+-//    else
+-//    {
+-//      jio_fprintf(defaultStream::error_stream(), "HotswapAgent not found on path:'%s'\n", ext_path_str);
+-//    }
+      if (ha_fatjar) {
+        jio_snprintf(ext_path_str + ext_path_length, sizeof(ext_path_str) - ext_path_length,
+                     "%shotswap%shotswap-agent.jar", os::file_separator(), os::file_separator());
+      } else {
+        jio_snprintf(ext_path_str + ext_path_length, sizeof(ext_path_str) - ext_path_length,
+                     "%shotswap%shotswap-agent-core.jar", os::file_separator(), os::file_separator());
+      }
+      int fd = ::open(ext_path_str, O_RDONLY);
+      if (fd >= 0) {
+        os::close(fd);
+        size_t length = strlen(ext_path_str) + 1;
+        char *options = NEW_C_HEAP_ARRAY(char,  length, mtArguments);
+        jio_snprintf(options, length, "%s", ext_path_str);
+        add_init_agent("instrument", ext_path_str, false);
+        jio_fprintf(defaultStream::output_stream(), "Starting HotswapAgent '%s'\n", ext_path_str);
+      }
+      else
+      {
+        jio_fprintf(defaultStream::error_stream(), "HotswapAgent not found on path:'%s'!\n", ext_path_str);
+      }
+    }
+   }
+ 
+   // TODO: open it only for org.hotswap.agent module
+diff --git a/src/hotspot/share/runtime/flags/jvmFlagConstraintList.cpp b/src/hotspot/share/runtime/flags/jvmFlagConstraintList.cpp
+index 16d8030fd1c..94044c4831c 100644
+--- a/src/hotspot/share/runtime/flags/jvmFlagConstraintList.cpp
+++ b/src/hotspot/share/runtime/flags/jvmFlagConstraintList.cpp
+@@ -199,6 +199,26 @@ public:
+   }
+ };
+ 
+class JVMFlagConstraint_ccstr : public JVMFlagConstraint {
+  JVMFlagConstraintFunc_ccstr _constraint;
+  const ccstr* _ptr;
+
+public:
+  // the "name" argument must be a string literal
+  JVMFlagConstraint_ccstr(const char* name, const ccstr* ptr,
+                                   JVMFlagConstraintFunc_ccstr func,
+                                 ConstraintType type) : JVMFlagConstraint(name, type), _constraint(func), _ptr(ptr) {}
+
+  JVMFlag::Error apply(bool verbose) {
+    ccstr value = *_ptr;
+    return _constraint(value, verbose);
+  }
+
+  JVMFlag::Error apply_ccstr(ccstr value, bool verbose) {
+    return _constraint(value, verbose);
+  }
+};
+
+ // No constraint emitting
+ void emit_constraint_no(...)                                                      { /* NOP */ }
+ 
+@@ -239,6 +259,9 @@ void emit_constraint_size_t(const char* name, const size_t* ptr, JVMFlagConstrai
+ void emit_constraint_double(const char* name, const double* ptr, JVMFlagConstraintFunc_double func, JVMFlagConstraint::ConstraintType type) {
+   JVMFlagConstraintList::add(new JVMFlagConstraint_double(name, ptr, func, type));
+ }
+void emit_constraint_ccstr(const char* name, ccstr* ptr, JVMFlagConstraintFunc_ccstr func, JVMFlagConstraint::ConstraintType type) {
+  JVMFlagConstraintList::add(new JVMFlagConstraint_ccstr(name, ptr, func, type));
+}
+ 
+ // Generate code to call emit_constraint_xxx function
+ #define EMIT_CONSTRAINT_PRODUCT_FLAG(type, name, value, doc)      ); emit_constraint_##type(#name,&name
+diff --git a/src/hotspot/share/runtime/flags/jvmFlagConstraintList.hpp b/src/hotspot/share/runtime/flags/jvmFlagConstraintList.hpp
+index 9c27f1db955..b644f7b817a 100644
+--- a/src/hotspot/share/runtime/flags/jvmFlagConstraintList.hpp
+++ b/src/hotspot/share/runtime/flags/jvmFlagConstraintList.hpp
+@@ -47,6 +47,7 @@ typedef JVMFlag::Error (*JVMFlagConstraintFunc_uintx)(uintx value, bool verbose)
+ typedef JVMFlag::Error (*JVMFlagConstraintFunc_uint64_t)(uint64_t value, bool verbose);
+ typedef JVMFlag::Error (*JVMFlagConstraintFunc_size_t)(size_t value, bool verbose);
+ typedef JVMFlag::Error (*JVMFlagConstraintFunc_double)(double value, bool verbose);
+typedef JVMFlag::Error (*JVMFlagConstraintFunc_ccstr)(ccstr value, bool verbose);
+ 
+ class JVMFlagConstraint : public CHeapObj<mtArguments> {
+ public:
+diff --git a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp
+index 6559d4252f0..21afac72a2e 100644
+--- a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp
+++ b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp
+@@ -140,3 +140,13 @@ JVMFlag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose) {
+   }
+   return JVMFlag::SUCCESS;
+ }
+
+JVMFlag::Error HotswapAgentConstraintFunc(char const* value, bool verbose) {
+  if (value != NULL) {
+    if (strcmp("disabled", value) != 0 && strcmp("fatjar", value) != 0 && strcmp("core", value) != 0 && strcmp("external", value) != 0) {
+      JVMFlag::printError(verbose, "HotswapAgent(%s) must be one of disabled,fatjar,core or external.\n", value);
+      return JVMFlag::VIOLATES_CONSTRAINT;
+    }
+  }
+  return JVMFlag::SUCCESS;
+}
+diff --git a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.hpp b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.hpp
+index 8763b83fd37..c9ed15a89e1 100644
+--- a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.hpp
+++ b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.hpp
+@@ -46,5 +46,6 @@ JVMFlag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose);
+ 
+ JVMFlag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose);
+ 
+JVMFlag::Error HotswapAgentConstraintFunc(char const* value, bool verbose);
+ 
+ #endif /* SHARE_VM_RUNTIME_JVMFLAGCONSTRAINTSRUNTIME_HPP */
+diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
+index 1984b8c28f9..c015b89b176 100644
+--- a/src/hotspot/share/runtime/globals.hpp
+++ b/src/hotspot/share/runtime/globals.hpp
+@@ -2695,8 +2695,16 @@ define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
+              "Allow enhanced class redefinition beyond swapping method "    \
+              "bodies")                                                      \
+                                                                             \
+-  product(bool, DisableHotswapAgent, DISABLED_HOTSWAP_AGENT,                \
+-             "Disable integrated Hotswap Agent (HotswapVM only)")
+  product(ccstr, HotswapAgent, "disabled",                                  \
+          "Specify HotswapAgent image to be used."                          \
+          "disabled: hotswap agent is disabled (default)"                   \
+          "fatjar: full HA. Use integrated hotswap-agent.jar"               \
+          "core: core HA. Use integrated hotswap-agent-core.jar"            \
+          "external: external HA. use external HA, open required JDK "      \
+          "modules.")                                                       \
+          constraint(HotswapAgentConstraintFunc, AfterErgo)
+
+
+ #define VM_FLAGS(develop,                                                   \
+                  develop_pd,                                                \
+                  product,                                                   \
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0026-Support-for-redefinition-of-Well-Known-classses-java.patch
+++ b/jb/project/tools/patches/dcevm/0026-Support-for-redefinition-of-Well-Known-classses-java.patch
@@ -0,0 +1,333 @@
+From a9468fd22397d85bc238b6ec763f4643245999ab Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 7 Mar 2021 20:22:54 +0100
+Subject: [PATCH 26/44] Support for redefinition of Well Known classses
+ (java.*,jdk.*, sun.*)
+
+---
+ src/hotspot/share/ci/ciKlass.hpp              |  1 +
+ src/hotspot/share/ci/ciObjectFactory.cpp      | 34 +++++++++++
+ src/hotspot/share/ci/ciObjectFactory.hpp      |  6 ++
+ .../share/classfile/systemDictionary.cpp      | 10 +++
+ .../share/classfile/systemDictionary.hpp      |  2 +
+ src/hotspot/share/classfile/vmSymbols.hpp     |  2 +
+ src/hotspot/share/compiler/compileBroker.cpp  | 11 ++++
+ src/hotspot/share/memory/universe.cpp         |  8 +++
+ src/hotspot/share/memory/universe.hpp         |  3 +
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 61 ++++++++++++++++++-
+ .../prims/jvmtiEnhancedRedefineClasses.hpp    |  2 +
+ 11 files changed, 139 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/ci/ciKlass.hpp b/src/hotspot/share/ci/ciKlass.hpp
+index 896f489453a..c610c365aba 100644
+--- a/src/hotspot/share/ci/ciKlass.hpp
+++ b/src/hotspot/share/ci/ciKlass.hpp
+@@ -129,6 +129,7 @@ public:
+   void print_name_on(outputStream* st);
+ 
+   const char* external_name() const;
+  Klass* new_version() { return get_Klass()->new_version(); }
+ };
+ 
+ #endif // SHARE_VM_CI_CIKLASS_HPP
+diff --git a/src/hotspot/share/ci/ciObjectFactory.cpp b/src/hotspot/share/ci/ciObjectFactory.cpp
+index b2ab15c4b65..d997a90a055 100644
+--- a/src/hotspot/share/ci/ciObjectFactory.cpp
+++ b/src/hotspot/share/ci/ciObjectFactory.cpp
+@@ -70,7 +70,10 @@ GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
+ ciSymbol*                 ciObjectFactory::_shared_ci_symbols[vmSymbols::SID_LIMIT];
+ int                       ciObjectFactory::_shared_ident_limit = 0;
+ volatile bool             ciObjectFactory::_initialized = false;
+volatile bool             ciObjectFactory::_reinitialize_wk_klasses = false;
+ 
+// TODO: review...
+Arena* ciObjectFactory::_initial_arena = NULL;
+ 
+ // ------------------------------------------------------------------
+ // ciObjectFactory::ciObjectFactory
+@@ -112,6 +115,7 @@ void ciObjectFactory::initialize() {
+   // compiler thread that initializes the initial ciObjectFactory which
+   // creates the shared ciObjects that all later ciObjectFactories use.
+   Arena* arena = new (mtCompiler) Arena(mtCompiler);
+  ciObjectFactory::_initial_arena = arena;
+   ciEnv initial(arena);
+   ciEnv* env = ciEnv::current();
+   env->_factory->init_shared_objects();
+@@ -120,6 +124,36 @@ void ciObjectFactory::initialize() {
+ 
+ }
+ 
+// (DCEVM) wk classes could be modified
+void ciObjectFactory::reinitialize_wk_classes() {
+  ASSERT_IN_VM;
+  JavaThread* thread = JavaThread::current();
+  HandleMark  handle_mark(thread);
+
+  // This Arena is long lived and exists in the resource mark of the
+  // compiler thread that initializes the initial ciObjectFactory which
+  // creates the shared ciObjects that all later ciObjectFactories use.
+  // Arena* arena = new (mtCompiler) Arena(mtCompiler);
+  ciEnv initial(ciObjectFactory::_initial_arena);
+  ciEnv* env = ciEnv::current();
+  env->_factory->do_reinitialize_wk_classes();
+  _reinitialize_wk_klasses = false;
+}
+
+// (DCEVM) wk classes could be modified
+void ciObjectFactory::do_reinitialize_wk_classes() {
+#define WK_KLASS_DEFN(name, ignore_s, opt)   \
+  if (ciEnv::_##name != NULL && ciEnv::_##name->new_version() != NULL) { \
+    int old_ident = ciEnv::_##name->ident(); \
+    ciEnv::_##name = get_metadata(SystemDictionary::name())->as_instance_klass(); \
+    ciEnv::_##name->compute_nonstatic_fields(); \
+    ciEnv::_##name->set_ident(old_ident); \
+  }
+
+  WK_KLASSES_DO(WK_KLASS_DEFN)
+#undef WK_KLASS_DEFN
+}
+
+ void ciObjectFactory::init_shared_objects() {
+ 
+   _next_ident = 1;  // start numbering CI objects at 1
+diff --git a/src/hotspot/share/ci/ciObjectFactory.hpp b/src/hotspot/share/ci/ciObjectFactory.hpp
+index 5d573350aa2..2978261328c 100644
+--- a/src/hotspot/share/ci/ciObjectFactory.hpp
+++ b/src/hotspot/share/ci/ciObjectFactory.hpp
+@@ -41,9 +41,11 @@ class ciObjectFactory : public ResourceObj {
+ 
+ private:
+   static volatile bool _initialized;
+  static volatile bool _reinitialize_wk_klasses;
+   static GrowableArray<ciMetadata*>* _shared_ci_metadata;
+   static ciSymbol*                 _shared_ci_symbols[];
+   static int                       _shared_ident_limit;
+  static Arena*                    _initial_arena;
+ 
+   Arena*                    _arena;
+   GrowableArray<ciMetadata*>*        _ci_metadata;
+@@ -89,10 +91,14 @@ private:
+   ciInstance* get_unloaded_instance(ciInstanceKlass* klass);
+ 
+   static int compare_cimetadata(ciMetadata** a, ciMetadata** b);
+  void do_reinitialize_wk_classes();
+ public:
+   static bool is_initialized() { return _initialized; }
+  static bool is_reinitialize_wk_klasses() { return _reinitialize_wk_klasses; }
+  static void set_reinitialize_wk_klasses() { _reinitialize_wk_klasses = true; }
+ 
+   static void initialize();
+  static void reinitialize_wk_classes();
+   void init_shared_objects();
+   void remove_symbols();
+ 
+diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
+index cf0a05176c8..be7fcbf2b47 100644
+--- a/src/hotspot/share/classfile/systemDictionary.cpp
+++ b/src/hotspot/share/classfile/systemDictionary.cpp
+@@ -1979,6 +1979,16 @@ bool SystemDictionary::is_well_known_klass(Symbol* class_name) {
+ }
+ #endif
+ 
+bool SystemDictionary::update_well_known_klass(InstanceKlass* old_klass, InstanceKlass* new_klass) {
+  for (int id = FIRST_WKID; id < WKID_LIMIT; id++) {
+    if (well_known_klass((WKID) id) == old_klass) {
+      *well_known_klass_addr((WKID)id) = new_klass;
+      return true;
+    }
+  }
+  return false;
+}
+
+ bool SystemDictionary::resolve_wk_klass(WKID id, int init_opt, TRAPS) {
+   assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
+   int  info = wk_init_info[id - FIRST_WKID];
+diff --git a/src/hotspot/share/classfile/systemDictionary.hpp b/src/hotspot/share/classfile/systemDictionary.hpp
+index 0002abe6122..707ff871e19 100644
+--- a/src/hotspot/share/classfile/systemDictionary.hpp
+++ b/src/hotspot/share/classfile/systemDictionary.hpp
+@@ -463,6 +463,8 @@ public:
+   static bool is_well_known_klass(Symbol* class_name);
+ #endif
+ 
+  static bool update_well_known_klass(InstanceKlass* new_klass, InstanceKlass* old_klass);
+
+   // Enhanced class redefinition
+   static void remove_from_hierarchy(InstanceKlass* k);
+   static void update_constraints_after_redefinition();
+diff --git a/src/hotspot/share/classfile/vmSymbols.hpp b/src/hotspot/share/classfile/vmSymbols.hpp
+index 0d0badeabd0..3477a408cb6 100644
+--- a/src/hotspot/share/classfile/vmSymbols.hpp
+++ b/src/hotspot/share/classfile/vmSymbols.hpp
+@@ -356,6 +356,8 @@
+   template(exit_method_name,                          "exit")                                     \
+   template(add_method_name,                           "add")                                      \
+   template(remove_method_name,                        "remove")                                   \
+  template(registerNatives_method_name,               "registerNatives")                          \
+  template(initIDs_method_name,                       "initIDs")                                  \
+   template(parent_name,                               "parent")                                   \
+   template(threads_name,                              "threads")                                  \
+   template(groups_name,                               "groups")                                   \
+diff --git a/src/hotspot/share/compiler/compileBroker.cpp b/src/hotspot/share/compiler/compileBroker.cpp
+index 1ff09ebf3ec..bd662b5ebef 100644
+--- a/src/hotspot/share/compiler/compileBroker.cpp
+++ b/src/hotspot/share/compiler/compileBroker.cpp
+@@ -1871,6 +1871,17 @@ void CompileBroker::compiler_thread_loop() {
+       if (method()->number_of_breakpoints() == 0) {
+         // Compile the method.
+         if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
+
+          // TODO: review usage of CompileThread_lock (DCEVM)
+          if (ciObjectFactory::is_reinitialize_wk_klasses())
+          {
+            ASSERT_IN_VM;
+            MutexLocker only_one (CompileThread_lock, thread);
+            if (ciObjectFactory::is_reinitialize_wk_klasses()) {
+              ciObjectFactory::reinitialize_wk_classes();
+            }
+          }
+
+           invoke_compiler_on_method(task);
+           thread->start_idle_timer();
+         } else {
+diff --git a/src/hotspot/share/memory/universe.cpp b/src/hotspot/share/memory/universe.cpp
+index 2e4f597cf1f..4b2c3e62941 100644
+--- a/src/hotspot/share/memory/universe.cpp
+++ b/src/hotspot/share/memory/universe.cpp
+@@ -1030,6 +1030,14 @@ void Universe::initialize_known_methods(TRAPS) {
+                           vmSymbols::doStackWalk_signature(), false, CHECK);
+ }
+ 
+void Universe::reinitialize_loader_addClass_method(TRAPS) {
+  // Set up method for registering loaded classes in class loader vector
+  initialize_known_method(_loader_addClass_cache,
+                          SystemDictionary::ClassLoader_klass(),
+                          "addClass",
+                          vmSymbols::class_void_signature(), false, CHECK);
+}
+
+ void universe2_init() {
+   EXCEPTION_MARK;
+   Universe::genesis(CATCH);
+diff --git a/src/hotspot/share/memory/universe.hpp b/src/hotspot/share/memory/universe.hpp
+index 742dada0e8f..d1af82b5fa7 100644
+--- a/src/hotspot/share/memory/universe.hpp
+++ b/src/hotspot/share/memory/universe.hpp
+@@ -349,6 +349,9 @@ class Universe: AllStatic {
+   // Function to initialize these
+   static void initialize_known_methods(TRAPS);
+ 
+  // Enhanced class redefinition
+  static void reinitialize_loader_addClass_method(TRAPS);
+
+   static oop          null_ptr_exception_instance()   { return _null_ptr_exception_instance;   }
+   static oop          arithmetic_exception_instance() { return _arithmetic_exception_instance; }
+   static oop          virtual_machine_error_instance() { return _virtual_machine_error_instance; }
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index f4bde7504c8..80d4e68ccae 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -497,6 +497,16 @@ void VM_EnhancedRedefineClasses::doit() {
+     redefine_single_class(_new_classes->at(i), thread);
+   }
+ 
+  // Update possible redefinition of well-known classes (like ClassLoader)
+  for (int i = 0; i < _new_classes->length(); i++) {
+    InstanceKlass* cur = _new_classes->at(i);
+    if (cur->old_version() != NULL && SystemDictionary::update_well_known_klass(InstanceKlass::cast(cur->old_version()), cur))
+    {
+      log_trace(redefine, class, obsolete, metadata)("Well known class updated %s", cur->external_name());
+      ciObjectFactory::set_reinitialize_wk_klasses();
+    }
+  }
+
+   // 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);
+@@ -672,12 +682,56 @@ void VM_EnhancedRedefineClasses::doit() {
+   _timer_vm_op_doit.stop();
+ }
+ 
+void VM_EnhancedRedefineClasses::reinitializeJDKClasses() {
+  if (!_new_classes->is_empty()) {
+    ResourceMark rm(Thread::current());
+
+    for (int i = 0; i < _new_classes->length(); i++) {
+      InstanceKlass* cur = _new_classes->at(i);
+
+      if (cur->name()->starts_with("java/") || cur->name()->starts_with("jdk/") || cur->name()->starts_with("sun/")) {
+
+        if (cur == SystemDictionary::ClassLoader_klass()) {
+          // ClassLoader.addClass method is cached in Universe, we must redefine
+          Universe::reinitialize_loader_addClass_method(Thread::current());
+          log_trace(redefine, class, obsolete, metadata)("Reinitialize ClassLoade addClass method cache.");
+        }
+
+        // naive assumptions that only JDK classes has native static "registerNative" and "initIDs" methods
+        int end;
+        Symbol* signature = vmSymbols::registerNatives_method_name();
+        int midx = cur->find_method_by_name(signature, &end);
+        if (midx == -1) {
+          signature = vmSymbols::initIDs_method_name();
+          midx = cur->find_method_by_name(signature, &end);
+        }
+        Method* m = NULL;
+        if (midx != -1) {
+          m = cur->methods()->at(midx);
+        }
+        if (m != NULL && m->is_static() && m->is_native()) {
+          // call static registerNative if present
+          JavaValue result(T_VOID);
+          JavaCalls::call_static(&result,
+                                  cur,
+                                  signature,
+                                  vmSymbols::void_method_signature(),
+                                  Thread::current());
+          log_trace(redefine, class, obsolete, metadata)("Reregister natives of JDK class %s", cur->external_name());
+        }
+      }
+    }
+  }
+}
+
+ // Cleanup - runs in JVM thread
+ //  - free used memory
+ //  - end GC
+ void VM_EnhancedRedefineClasses::doit_epilogue() {
+   VM_GC_Operation::doit_epilogue();
+ 
+  reinitializeJDKClasses();
+
+   if (_new_classes != NULL) {
+     delete _new_classes;
+   }
+@@ -1589,7 +1643,12 @@ void VM_EnhancedRedefineClasses::check_methods_and_mark_as_obsolete() {
+ 
+       // obsolete methods need a unique idnum so they become new entries in
+       // the jmethodID cache in InstanceKlass
+-      assert(old_method->method_idnum() == new_method->method_idnum(), "must match");
+      if (old_method->method_idnum() != new_method->method_idnum()) {
+        log_error(redefine, class, normalize)
+          ("Method not matched: %d != %d  old: %s = new: %s",  old_method->method_idnum(), new_method->method_idnum(),
+              old_method->name_and_sig_as_C_string(), new_method->name_and_sig_as_C_string());
+        // assert(old_method->method_idnum() == new_method->method_idnum(), "must match");
+      }
+ //      u2 num = InstanceKlass::cast(_the_class_oop)->next_method_idnum();
+ //      if (num != ConstMethod::UNSET_IDNUM) {
+ //        old_method->set_method_idnum(num);
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index 4c0412d343d..79ea17b0d47 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -141,6 +141,8 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+ 
+   void flush_dependent_code(InstanceKlass* k_h, TRAPS);
+ 
+  void reinitializeJDKClasses();
+
+   static void check_class(InstanceKlass* k_oop, TRAPS);
+ 
+   static void dump_methods();
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0027-JBR-3458-Skip-dynamic-proxy-classes-based-on-com.sun.patch
+++ b/jb/project/tools/patches/dcevm/0027-JBR-3458-Skip-dynamic-proxy-classes-based-on-com.sun.patch
@@ -0,0 +1,27 @@
+From acafc3515aa1083d2214336af596cb579a488c8d Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Fri, 19 Mar 2021 19:13:38 +0100
+Subject: [PATCH 27/44] JBR-3458: Skip dynamic proxy classes based on
+ com.sun.proxy
+
+---
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 80d4e68ccae..10c375d601c 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -689,7 +689,8 @@ void VM_EnhancedRedefineClasses::reinitializeJDKClasses() {
+     for (int i = 0; i < _new_classes->length(); i++) {
+       InstanceKlass* cur = _new_classes->at(i);
+ 
+-      if (cur->name()->starts_with("java/") || cur->name()->starts_with("jdk/") || cur->name()->starts_with("sun/")) {
+      if ((cur->name()->starts_with("java/") || cur->name()->starts_with("jdk/") || cur->name()->starts_with("sun/"))
+          && cur->name()->index_of_at(0, "$$") == -1) { // skip dynamic proxies
+ 
+         if (cur == SystemDictionary::ClassLoader_klass()) {
+           // ClassLoader.addClass method is cached in Universe, we must redefine
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0028-JBR-3459-Fix-race-condition-in-ClassLoaderDataGraph-.patch
+++ b/jb/project/tools/patches/dcevm/0028-JBR-3459-Fix-race-condition-in-ClassLoaderDataGraph-.patch
@@ -0,0 +1,79 @@
+From 4ba18f232db0dd92369d110cbb4f38f5a35eb5c7 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <lada.dvorak7@gmail.com>
+Date: Sat, 20 Mar 2021 20:51:08 +0100
+Subject: [PATCH 28/44] JBR-3459: Fix race condition in
+ ClassLoaderDataGraph::classes_do
+
+InstanceKlass in ClassLoaderData can be uninitialized when
+ClassLoaderDataGraph::classes_do is called. Using
+ClassLoaderDataGraph::dictionary_classes_do is safe but problem is still
+persisting with anonymous classes.
+---
+ src/hotspot/share/classfile/classLoaderData.cpp     | 10 ++++++++++
+ src/hotspot/share/classfile/classLoaderData.hpp     |  4 ++++
+ .../share/prims/jvmtiEnhancedRedefineClasses.cpp    | 13 +++++++++++--
+ 3 files changed, 25 insertions(+), 2 deletions(-)
+
+diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
+index 68df33b6c40..b12784954af 100644
+--- a/src/hotspot/share/classfile/classLoaderData.cpp
+++ b/src/hotspot/share/classfile/classLoaderData.cpp
+@@ -1169,6 +1169,16 @@ void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
+   }
+ }
+ 
+void ClassLoaderDataGraph::anonymous_classes_do(KlassClosure* klass_closure) {
+  Thread* thread = Thread::current();
+  for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+    if (cld->is_anonymous()) {
+      Handle holder(thread, cld->holder_phantom());
+      cld->classes_do(klass_closure);
+    }
+  }
+}
+
+ void ClassLoaderDataGraph::classes_do(void f(Klass* const)) {
+   Thread* thread = Thread::current();
+   for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+diff --git a/src/hotspot/share/classfile/classLoaderData.hpp b/src/hotspot/share/classfile/classLoaderData.hpp
+index 92f57dac23e..c4c17112a2d 100644
+--- a/src/hotspot/share/classfile/classLoaderData.hpp
+++ b/src/hotspot/share/classfile/classLoaderData.hpp
+@@ -108,6 +108,10 @@ class ClassLoaderDataGraph : public AllStatic {
+   // for redefinition.  These classes are removed during the next class unloading.
+   // Walking the ClassLoaderDataGraph also includes anonymous classes.
+   static void classes_do(KlassClosure* klass_closure);
+
+  // Enhanced class redefinition
+  static void anonymous_classes_do(KlassClosure* klass_closure);
+
+   static void classes_do(void f(Klass* const));
+   static void methods_do(void f(Method*));
+   static void modules_do(void f(ModuleEntry*));
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 10c375d601c..5de5f78aea0 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -2130,8 +2130,17 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
+   AffectedKlassClosure closure(_affected_klasses);
+   // Updated in j10, from original SystemDictionary::classes_do
+ 
+-  ClassLoaderDataGraph::classes_do(&closure);
+-  //ClassLoaderDataGraph::dictionary_classes_do(&closure);
+  // 0. we can't use ClassLoaderDataGraph::classes_do since classes can be uninitialized in cld,
+  // fully initialized class is in system dictionary
+  // ClassLoaderDataGraph::classes_do(&closure);
+
+  // 1. Scan over dictionaries
+  ClassLoaderDataGraph::dictionary_classes_do(&closure);
+
+  // 2. Anonymous class is not in dictionary, we have to iterate anonymous cld directly, but there is race cond...
+  // TODO: review ... anonymous class is added to cld before InstanceKlass initialization,
+  //                  find out how to check if the InstanceKlass is initialized
+  ClassLoaderDataGraph::anonymous_classes_do(&closure);
+ 
+   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0029-JBR-3867-update-keys-of-jvmti-TAG-map-after-redefini.patch
+++ b/jb/project/tools/patches/dcevm/0029-JBR-3867-update-keys-of-jvmti-TAG-map-after-redefini.patch
@@ -0,0 +1,222 @@
+From f0c417c9f5eaf721a7c022e7c901af59a0993885 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 10 Oct 2021 20:25:30 +0200
+Subject: [PATCH 29/44] JBR-3867 - update keys of jvmti TAG map after
+ redefinition
+
+jdwp keeps relation class_ptr->class_ref in jvmti tag. class_ptr is used
+as a tag key, tag value is refnode. There are new class_ptrs after
+redefinition, therefore jdwp redefinition method update all affected
+keys in the tag map.
+---
+ src/hotspot/share/prims/jvmtiExtensions.cpp   | 24 ++++++++++++++
+ .../share/native/libjdwp/VirtualMachineImpl.c | 20 +++++++++++
+ .../share/native/libjdwp/commonRef.c          | 29 ++++++++++++++++
+ .../share/native/libjdwp/commonRef.h          |  2 ++
+ .../share/native/libjdwp/util.c               | 33 +++++++++++++++++++
+ .../share/native/libjdwp/util.h               |  3 ++
+ 6 files changed, 111 insertions(+)
+
+diff --git a/src/hotspot/share/prims/jvmtiExtensions.cpp b/src/hotspot/share/prims/jvmtiExtensions.cpp
+index 36bc47ad0b5..8a6058fd884 100644
+--- a/src/hotspot/share/prims/jvmtiExtensions.cpp
+++ b/src/hotspot/share/prims/jvmtiExtensions.cpp
+@@ -49,6 +49,15 @@ static jvmtiError JNICALL IsClassUnloadingEnabled(const jvmtiEnv* env, ...) {
+   return JVMTI_ERROR_NONE;
+ }
+ 
+// extension function
+static jvmtiError JNICALL IsEnhancedClassRedefinitionEnabled(const jvmtiEnv* env, jboolean* enabled, ...) {
+  if (enabled == NULL) {
+    return JVMTI_ERROR_NULL_POINTER;
+  }
+  *enabled = (jboolean)AllowEnhancedClassRedefinition;
+  return JVMTI_ERROR_NONE;
+}
+
+ // register extension functions and events. In this implementation we
+ // have a single extension function (to prove the API) that tests if class
+ // unloading is enabled or disabled. We also have a single extension event
+@@ -88,6 +97,21 @@ void JvmtiExtensions::register_extensions() {
+     event_params
+   };
+   _ext_events->append(&ext_event);
+
+  static jvmtiParamInfo func_params_enh_redef[] = {
+    { (char*)"IsEnhancedClassRedefinitionEnabled", JVMTI_KIND_OUT,  JVMTI_TYPE_JBOOLEAN, JNI_FALSE }
+
+  };
+  static jvmtiExtensionFunctionInfo ext_func_enh_redef = {
+    (jvmtiExtensionFunction)IsEnhancedClassRedefinitionEnabled,
+    (char*)"com.sun.hotspot.functions.IsEnhancedClassRedefinitionEnabled",
+    (char*)"Tell if enhanced class redefinition is enabled (-noclassgc)",
+    sizeof(func_params_enh_redef)/sizeof(func_params_enh_redef[0]),
+    func_params_enh_redef,
+    0,              // no non-universal errors
+    NULL
+  };
+  _ext_functions->append(&ext_func_enh_redef);
+ }
+ 
+ 
+diff --git a/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c b/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
+index d7ca956dc57..faa8f55f91f 100644
+--- a/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
+++ b/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
+@@ -475,6 +475,14 @@ redefineClasses(PacketInputStream *in, PacketOutputStream *out)
+     if (ok == JNI_TRUE) {
+         jvmtiError error;
+ 
+        jlong classIds[classCount];
+
+        if (gdata->isEnhancedClassRedefinitionEnabled) {
+            for (i = 0; i < classCount; ++i) {
+              classIds[i] = commonRef_refToID(env, classDefs[i].klass);
+            }
+        }
+
+         error = JVMTI_FUNC_PTR(gdata->jvmti,RedefineClasses)
+                         (gdata->jvmti, classCount, classDefs);
+         if (error != JVMTI_ERROR_NONE) {
+@@ -484,6 +492,18 @@ redefineClasses(PacketInputStream *in, PacketOutputStream *out)
+             for ( i = 0 ; i < classCount; i++ ) {
+                 eventHandler_freeClassBreakpoints(classDefs[i].klass);
+             }
+
+            if (gdata->isEnhancedClassRedefinitionEnabled) {
+                /* Update tags in jvmti to use new classes */
+                for ( i = 0 ; i < classCount; i++ ) {
+                    /* pointer in classIds[i] is updated by advanced redefinition to a new class */
+                    error = commonRef_updateTags(env, classIds[i]);
+                    if (error != JVMTI_ERROR_NONE) {
+                        break;
+                    }
+                }
+            }
+
+         }
+     }
+ 
+diff --git a/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.c b/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.c
+index 2a8f55014d9..3f33b423209 100644
+--- a/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.c
+++ b/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.c
+@@ -618,3 +618,32 @@ commonRef_unlock(void)
+ {
+     debugMonitorExit(gdata->refLock);
+ }
+
+/*
+ * Update JVMTI tags, used from enhanced redefinition
+ */
+jvmtiError
+commonRef_updateTags(JNIEnv *env, jlong id)
+{
+    jvmtiError error;
+
+    error = JVMTI_ERROR_NONE;
+
+    if (id == NULL_OBJECT_ID) {
+        return error;
+    }
+
+    debugMonitorEnter(gdata->refLock); {
+        RefNode *node;
+
+        node = findNodeByID(env, id);
+        if (node != NULL) {
+            error = JVMTI_FUNC_PTR(gdata->jvmti, SetTag)
+                                  (gdata->jvmti, node->ref, ptr_to_jlong(node));
+        } else {
+            printf("Node not found\n");
+        }
+    } debugMonitorExit(gdata->refLock);
+
+    return error;
+}
+diff --git a/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.h b/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.h
+index 7c76667eb19..d7b01e62a47 100644
+--- a/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.h
+++ b/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.h
+@@ -41,4 +41,6 @@ void commonRef_compact(void);
+ void commonRef_lock(void);
+ void commonRef_unlock(void);
+ 
+jvmtiError commonRef_updateTags(JNIEnv *env, jlong id);
+
+ #endif
+diff --git a/src/jdk.jdwp.agent/share/native/libjdwp/util.c b/src/jdk.jdwp.agent/share/native/libjdwp/util.c
+index f4a1d19589d..0642c4a3d7f 100644
+--- a/src/jdk.jdwp.agent/share/native/libjdwp/util.c
+++ b/src/jdk.jdwp.agent/share/native/libjdwp/util.c
+@@ -41,6 +41,7 @@ BackendGlobalData *gdata = NULL;
+ static jboolean isInterface(jclass clazz);
+ static jboolean isArrayClass(jclass clazz);
+ static char * getPropertyUTF8(JNIEnv *env, char *propertyName);
+static jboolean isEnhancedClassRedefinitionEnabled(JNIEnv *env);
+ 
+ /* Save an object reference for use later (create a NewGlobalRef) */
+ void
+@@ -281,6 +282,8 @@ util_initialize(JNIEnv *env)
+             }
+         }
+ 
+        gdata->isEnhancedClassRedefinitionEnabled = isEnhancedClassRedefinitionEnabled(env);
+
+     } END_WITH_LOCAL_REFS(env);
+ 
+ }
+@@ -1739,6 +1742,36 @@ getPropertyUTF8(JNIEnv *env, char *propertyName)
+     return value;
+ }
+ 
+static jboolean
+isEnhancedClassRedefinitionEnabled(JNIEnv *env)
+{
+    jvmtiError error;
+    jint count, i;
+    jvmtiExtensionFunctionInfo* ext_funcs;
+
+    error = JVMTI_FUNC_PTR(gdata->jvmti,GetExtensionFunctions)
+                (gdata->jvmti, &count, &ext_funcs);
+    if (error != JVMTI_ERROR_NONE) {
+        return JNI_FALSE;
+    }
+
+    for (i=0; i<count; i++) {
+        if (strcmp(ext_funcs[i].id, (char*)"com.sun.hotspot.functions.IsEnhancedClassRedefinitionEnabled") == 0) {
+            jboolean enabled;
+            error = (*ext_funcs[i].func)(gdata->jvmti, &enabled);
+
+            if (error != JVMTI_ERROR_NONE) {
+                return JNI_FALSE;
+            } else {
+                return enabled;
+            }
+        }
+    }
+
+    return JNI_FALSE;
+}
+
+
+ jboolean
+ isMethodObsolete(jmethodID method)
+ {
+diff --git a/src/jdk.jdwp.agent/share/native/libjdwp/util.h b/src/jdk.jdwp.agent/share/native/libjdwp/util.h
+index bcb59457120..72a365ad3c3 100644
+--- a/src/jdk.jdwp.agent/share/native/libjdwp/util.h
+++ b/src/jdk.jdwp.agent/share/native/libjdwp/util.h
+@@ -126,6 +126,9 @@ typedef struct {
+     int           objectsByIDsize;
+     int           objectsByIDcount;
+ 
+    /* true if enhanced class redefinition is enabled */
+    jboolean isEnhancedClassRedefinitionEnabled;
+
+      /* Indication that the agent has been loaded */
+      jboolean isLoaded;
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0030-JBR-3867-fix-msvc-compilation-issue-with-non-const-a.patch
+++ b/jb/project/tools/patches/dcevm/0030-JBR-3867-fix-msvc-compilation-issue-with-non-const-a.patch
@@ -0,0 +1,54 @@
+From 43ad1316176425552ac8aa34e26ab8554ec3a9f1 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 11 Oct 2021 20:22:26 +0200
+Subject: [PATCH 30/44] JBR-3867 - fix msvc compilation issue with non const
+ array on stack
+
+---
+ .../share/native/libjdwp/VirtualMachineImpl.c      | 14 ++++++++++----
+ 1 file changed, 10 insertions(+), 4 deletions(-)
+
+diff --git a/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c b/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
+index faa8f55f91f..53f7e44f579 100644
+--- a/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
+++ b/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
+@@ -475,11 +475,16 @@ redefineClasses(PacketInputStream *in, PacketOutputStream *out)
+     if (ok == JNI_TRUE) {
+         jvmtiError error;
+ 
+-        jlong classIds[classCount];
+        jlong* classIds = NULL;
+ 
+         if (gdata->isEnhancedClassRedefinitionEnabled) {
+-            for (i = 0; i < classCount; ++i) {
+-              classIds[i] = commonRef_refToID(env, classDefs[i].klass);
+            classIds = jvmtiAllocate(classCount*(int)sizeof(jlong));
+            if (classIds == NULL) {
+                outStream_setError(out, JDWP_ERROR(OUT_OF_MEMORY));
+                return JNI_TRUE;
+            }
+            for (i = 0; i < classCount; i++) {
+                classIds[i] = commonRef_refToID(env, classDefs[i].klass);
+             }
+         }
+ 
+@@ -493,7 +498,7 @@ redefineClasses(PacketInputStream *in, PacketOutputStream *out)
+                 eventHandler_freeClassBreakpoints(classDefs[i].klass);
+             }
+ 
+-            if (gdata->isEnhancedClassRedefinitionEnabled) {
+            if (gdata->isEnhancedClassRedefinitionEnabled && classIds != NULL) {
+                 /* Update tags in jvmti to use new classes */
+                 for ( i = 0 ; i < classCount; i++ ) {
+                     /* pointer in classIds[i] is updated by advanced redefinition to a new class */
+@@ -502,6 +507,7 @@ redefineClasses(PacketInputStream *in, PacketOutputStream *out)
+                         break;
+                     }
+                 }
+                jvmtiDeallocate((void*) classIds);
+             }
+ 
+         }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0031-Attempt-to-fix-JBR-3887.patch
+++ b/jb/project/tools/patches/dcevm/0031-Attempt-to-fix-JBR-3887.patch
@@ -0,0 +1,31 @@
+From 39d5a7e6ffd06362a40984c43a439b5778b65d53 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Tue, 19 Oct 2021 17:02:35 +0200
+Subject: [PATCH 31/44] Attempt to fix JBR-3887
+
+---
+ src/hotspot/share/prims/jvmtiExtensions.cpp | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiExtensions.cpp b/src/hotspot/share/prims/jvmtiExtensions.cpp
+index 8a6058fd884..9c8c98cb70e 100644
+--- a/src/hotspot/share/prims/jvmtiExtensions.cpp
+++ b/src/hotspot/share/prims/jvmtiExtensions.cpp
+@@ -50,7 +50,13 @@ static jvmtiError JNICALL IsClassUnloadingEnabled(const jvmtiEnv* env, ...) {
+ }
+ 
+ // extension function
+-static jvmtiError JNICALL IsEnhancedClassRedefinitionEnabled(const jvmtiEnv* env, jboolean* enabled, ...) {
+static jvmtiError JNICALL IsEnhancedClassRedefinitionEnabled(const jvmtiEnv* env, ...) {
+  jboolean* enabled = NULL;
+  va_list ap;
+
+  va_start(ap, env);
+  enabled = va_arg(ap, jboolean *);
+  va_end(ap);
+   if (enabled == NULL) {
+     return JVMTI_ERROR_NULL_POINTER;
+   }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0032-JBR-3937-Fix-crashes-in-C1-C2-compilers.patch
+++ b/jb/project/tools/patches/dcevm/0032-JBR-3937-Fix-crashes-in-C1-C2-compilers.patch
@@ -0,0 +1,141 @@
+From 56b381db23651cc1cec0a4b649dd2796b85e8b09 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 1 Nov 2021 19:00:41 +0100
+Subject: [PATCH 32/44] JBR-3937 Fix crashes in C1/C2 compilers
+
+There is a race condition in enhanced redefinition with C1/C2. Therefore
+the patch stops C1/C2 compilation before redefinition and release after
+redefinition finishing. There is no performance impact since dcevm
+flushes all code cache.
+---
+ src/hotspot/share/compiler/compileBroker.cpp | 39 +++++++++++++++++++-
+ src/hotspot/share/compiler/compileBroker.hpp |  6 +++
+ src/hotspot/share/prims/jvmtiEnv.cpp         |  7 ++++
+ 3 files changed, 51 insertions(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/compiler/compileBroker.cpp b/src/hotspot/share/compiler/compileBroker.cpp
+index bd662b5ebef..bd0f9f0efab 100644
+--- a/src/hotspot/share/compiler/compileBroker.cpp
+++ b/src/hotspot/share/compiler/compileBroker.cpp
+@@ -133,6 +133,8 @@ CompileLog** CompileBroker::_compiler2_logs = NULL;
+ // These counters are used to assign an unique ID to each compilation.
+ volatile jint CompileBroker::_compilation_id     = 0;
+ volatile jint CompileBroker::_osr_compilation_id = 0;
+volatile bool CompileBroker::_compilation_stopped = false;
+volatile int CompileBroker::_active_compilations = 0;
+ 
+ // Debugging information
+ int  CompileBroker::_last_compile_type     = no_compile;
+@@ -2191,7 +2193,22 @@ void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
+           locker.wait(Mutex::_no_safepoint_check_flag);
+         }
+       }
+-      comp->compile_method(&ci_env, target, osr_bci, directive);
+
+      if (AllowEnhancedClassRedefinition) {
+        {
+          MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
+          while (_compilation_stopped) {
+            locker.wait(Mutex::_no_safepoint_check_flag);
+          }
+          Atomic::add(1, &_active_compilations);
+        }
+
+        comp->compile_method(&ci_env, target, osr_bci, directive);
+        Atomic::sub(1, &_active_compilations);
+
+      } else {
+        comp->compile_method(&ci_env, target, osr_bci, directive);
+      }
+     }
+ 
+     if (!ci_env.failing() && task->code() == NULL) {
+@@ -2853,3 +2870,23 @@ void CompileBroker::print_heapinfo(outputStream* out, const char* function, size
+   }
+   out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
+ }
+
+void CompileBroker::stopCompilationBeforeEnhancedRedefinition() {
+  if (AllowEnhancedClassRedefinition) {
+    MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
+    _compilation_stopped = true;
+    while (_active_compilations > 0) {
+      VM_ThreadsSuspendJVMTI tsj;
+      VMThread::execute(&tsj);
+      locker.wait(Mutex::_no_safepoint_check_flag);
+    }
+  }
+}
+
+void CompileBroker::releaseCompilationAfterEnhancedRedefinition() {
+  if (AllowEnhancedClassRedefinition) {
+    MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
+    _compilation_stopped = false;
+    locker.notify_all();
+  }
+}
+diff --git a/src/hotspot/share/compiler/compileBroker.hpp b/src/hotspot/share/compiler/compileBroker.hpp
+index 53e496cd306..fa50e778d9e 100644
+--- a/src/hotspot/share/compiler/compileBroker.hpp
+++ b/src/hotspot/share/compiler/compileBroker.hpp
+@@ -173,6 +173,9 @@ class CompileBroker: AllStatic {
+   static volatile jint _compilation_id;
+   static volatile jint _osr_compilation_id;
+ 
+  static volatile bool _compilation_stopped;
+  static volatile int _active_compilations;
+
+   static int  _last_compile_type;
+   static int  _last_compile_level;
+   static char _last_method_compiled[name_buffer_length];
+@@ -421,6 +424,9 @@ public:
+   // CodeHeap State Analytics.
+   static void print_info(outputStream *out);
+   static void print_heapinfo(outputStream *out, const char* function, size_t granularity);
+
+  static void stopCompilationBeforeEnhancedRedefinition();
+  static void releaseCompilationAfterEnhancedRedefinition();
+ };
+ 
+ #endif // SHARE_VM_COMPILER_COMPILEBROKER_HPP
+diff --git a/src/hotspot/share/prims/jvmtiEnv.cpp b/src/hotspot/share/prims/jvmtiEnv.cpp
+index 54617f05b5a..0ca9ec020a9 100644
+--- a/src/hotspot/share/prims/jvmtiEnv.cpp
+++ b/src/hotspot/share/prims/jvmtiEnv.cpp
+@@ -29,6 +29,7 @@
+ #include "classfile/modules.hpp"
+ #include "classfile/systemDictionary.hpp"
+ #include "classfile/vmSymbols.hpp"
+#include "compiler/compileBroker.hpp"
+ #include "interpreter/bytecodeStream.hpp"
+ #include "interpreter/interpreter.hpp"
+ #include "jvmtifiles/jvmtiEnv.hpp"
+@@ -453,9 +454,12 @@ JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
+     class_definitions[index].klass              = jcls;
+   }
+   if (AllowEnhancedClassRedefinition) {
+    // Stop compilation to avoid compilator race condition (crashes) with advanced redefinition
+    CompileBroker::stopCompilationBeforeEnhancedRedefinition();
+     MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
+     VMThread::execute(&op);
+    CompileBroker::releaseCompilationAfterEnhancedRedefinition();
+     return (op.check_error());
+   }
+   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
+@@ -469,9 +473,12 @@ JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
+ jvmtiError
+ JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
+   if (AllowEnhancedClassRedefinition) {
+    // Stop compilation to avoid compilator race condition (crashes) with advanced redefinition
+    CompileBroker::stopCompilationBeforeEnhancedRedefinition();
+     MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
+     VMThread::execute(&op);
+    CompileBroker::releaseCompilationAfterEnhancedRedefinition();
+     return (op.check_error());
+   }
+   VM_RedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0033-JBR-3938-fix-race-condition-in-anonymous-class-loadi.patch
+++ b/jb/project/tools/patches/dcevm/0033-JBR-3938-fix-race-condition-in-anonymous-class-loadi.patch
@@ -0,0 +1,121 @@
+From 962796e56be75ef70c1d6dcaa9eaf19e755c61d8 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 1 Nov 2021 19:20:13 +0100
+Subject: [PATCH 33/44] JBR-3938 - fix race condition in anonymous class
+ loading
+
+Anonymous class must be checked if it is fully initialized if it is used
+in ClassLoaderDataGraph closure.
+---
+ .../prims/jvmtiEnhancedRedefineClasses.cpp    | 44 ++++++-------------
+ .../prims/jvmtiEnhancedRedefineClasses.hpp    |  1 -
+ 2 files changed, 14 insertions(+), 31 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 5de5f78aea0..a8546a5fbe2 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -517,8 +517,6 @@ 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;
+@@ -647,10 +645,6 @@ void VM_EnhancedRedefineClasses::doit() {
+   // TODO: explain...
+   ciObjectFactory::resort_shared_ci_metadata();
+ 
+-  // FIXME - check if it was in JDK8. Copied from standard JDK9 hotswap.
+-  //MethodDataCleaner clean_weak_method_links;
+-  //ClassLoaderDataGraph::classes_do(&clean_weak_method_links);
+-
+   // Disable any dependent concurrent compilations
+   SystemDictionary::notice_modification();
+ 
+@@ -1568,29 +1562,6 @@ 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) {
+@@ -2071,12 +2042,23 @@ void VM_EnhancedRedefineClasses::dump_methods() {
+ class AffectedKlassClosure : public KlassClosure {
+  private:
+    GrowableArray<Klass*>* _affected_klasses;
+   bool _is_anonymous;
+  public:
+-  AffectedKlassClosure(GrowableArray<Klass*>* affected_klasses) : _affected_klasses(affected_klasses) {}
+  AffectedKlassClosure(GrowableArray<Klass*>* affected_klasses) : _affected_klasses(affected_klasses), _is_anonymous(false) {}
+
+  bool is_anonymous() { return _is_anonymous; }
+  void set_anonymous(bool value) { _is_anonymous = value; }
+ 
+   void do_klass(Klass* klass) {
+     assert(!_affected_klasses->contains(klass), "must not occur more than once!");
+ 
+    if (_is_anonymous && klass->is_instance_klass()) {
+      InstanceKlass *ik = InstanceKlass::cast(klass);
+      if (ik->is_not_initialized()) {
+        return;  // anonymous class does not need to be initialized
+      }
+    }
+
+     if (klass->new_version() != NULL) {
+       return;
+     }
+@@ -2135,11 +2117,13 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
+   // ClassLoaderDataGraph::classes_do(&closure);
+ 
+   // 1. Scan over dictionaries
+  closure.set_anonymous(false);
+   ClassLoaderDataGraph::dictionary_classes_do(&closure);
+ 
+   // 2. Anonymous class is not in dictionary, we have to iterate anonymous cld directly, but there is race cond...
+   // TODO: review ... anonymous class is added to cld before InstanceKlass initialization,
+   //                  find out how to check if the InstanceKlass is initialized
+  closure.set_anonymous(true);
+   ClassLoaderDataGraph::anonymous_classes_do(&closure);
+ 
+   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+index 79ea17b0d47..fc0d8e82643 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
+@@ -119,7 +119,6 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
+   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);
+ 
+   // Figure out which new methods match old methods in name and signature,
+   // which methods have been added, and which are no longer present
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0034-Fix-line-ending-CRLF-LF.patch
+++ b/jb/project/tools/patches/dcevm/0034-Fix-line-ending-CRLF-LF.patch
--- a/jb/project/tools/patches/dcevm/0035-JBR-3963-fix-memory-leaks-in-G1-in-redefinition.patch
+++ b/jb/project/tools/patches/dcevm/0035-JBR-3963-fix-memory-leaks-in-G1-in-redefinition.patch
@@ -0,0 +1,27 @@
+From 15d06f325a892e2fa665698b4b76988cff236075 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 5 Nov 2021 18:16:01 +0100
+Subject: [PATCH 35/44] JBR-3963 - fix memory leaks in G1 in redefinition
+
+ChangePointersObjectClosure allocates handles and resources, that must
+be properly released in worker thread
+---
+ src/hotspot/share/gc/g1/g1CollectedHeap.cpp | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
+index d33a5ff3a54..7c68dbf4bf1 100644
+--- a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp
+@@ -2125,6 +2125,8 @@ class G1IterateObjectClosureTask : public AbstractGangTask {
+     _cl(cl), _g1h(g1h),  _hrclaimer(g1h->workers()->active_workers()) { }
+ 
+   virtual void work(uint worker_id) {
+    ResourceMark rm;
+    HandleMark hm;
+     IterateObjectClosureRegionClosure blk(_cl);
+     _g1h->heap_region_par_iterate_from_worker_offset(&blk, &_hrclaimer, worker_id);
+   }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0036-JBR-3937-use-specialized-DcevmCompilation_lock-to-pa.patch
+++ b/jb/project/tools/patches/dcevm/0036-JBR-3937-use-specialized-DcevmCompilation_lock-to-pa.patch
@@ -0,0 +1,114 @@
+From eb5af1af95c0f1dcd7298be6114d9af74f72b5f8 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 5 Nov 2021 18:53:11 +0100
+Subject: [PATCH 36/44] JBR-3937 - use specialized DcevmCompilation_lock to
+ pause C1/C2
+
+Sources are synchronized now with dcevm17 code base. Compilation_lock is
+used exclusively for WhiteBox, so we use a new lock for dcevm
+---
+ src/hotspot/share/compiler/compileBroker.cpp | 10 +++++-----
+ src/hotspot/share/prims/jvmtiEnv.cpp         |  4 ++--
+ src/hotspot/share/runtime/mutexLocker.cpp    |  3 +++
+ src/hotspot/share/runtime/mutexLocker.hpp    |  1 +
+ 4 files changed, 11 insertions(+), 7 deletions(-)
+
+diff --git a/src/hotspot/share/compiler/compileBroker.cpp b/src/hotspot/share/compiler/compileBroker.cpp
+index bd0f9f0efab..448e9b1002b 100644
+--- a/src/hotspot/share/compiler/compileBroker.cpp
+++ b/src/hotspot/share/compiler/compileBroker.cpp
+@@ -2196,7 +2196,7 @@ void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
+ 
+       if (AllowEnhancedClassRedefinition) {
+         {
+-          MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
+          MonitorLockerEx locker(DcevmCompilation_lock, Mutex::_no_safepoint_check_flag);
+           while (_compilation_stopped) {
+             locker.wait(Mutex::_no_safepoint_check_flag);
+           }
+@@ -2873,19 +2873,19 @@ void CompileBroker::print_heapinfo(outputStream* out, const char* function, size
+ 
+ void CompileBroker::stopCompilationBeforeEnhancedRedefinition() {
+   if (AllowEnhancedClassRedefinition) {
+-    MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
+    MonitorLockerEx locker(DcevmCompilation_lock, Mutex::_no_safepoint_check_flag);
+     _compilation_stopped = true;
+     while (_active_compilations > 0) {
+-      VM_ThreadsSuspendJVMTI tsj;
+      VM_ThreadsSuspendJVMTI tsj; // force safepoint to run C1/C2 VM op
+       VMThread::execute(&tsj);
+-      locker.wait(Mutex::_no_safepoint_check_flag);
+      locker.wait(Mutex::_no_safepoint_check_flag, 10);
+     }
+   }
+ }
+ 
+ void CompileBroker::releaseCompilationAfterEnhancedRedefinition() {
+   if (AllowEnhancedClassRedefinition) {
+-    MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
+    MonitorLockerEx locker(DcevmCompilation_lock, Mutex::_no_safepoint_check_flag);
+     _compilation_stopped = false;
+     locker.notify_all();
+   }
+diff --git a/src/hotspot/share/prims/jvmtiEnv.cpp b/src/hotspot/share/prims/jvmtiEnv.cpp
+index 0ca9ec020a9..221e8a20c76 100644
+--- a/src/hotspot/share/prims/jvmtiEnv.cpp
+++ b/src/hotspot/share/prims/jvmtiEnv.cpp
+@@ -454,9 +454,9 @@ JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
+     class_definitions[index].klass              = jcls;
+   }
+   if (AllowEnhancedClassRedefinition) {
+    MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     // Stop compilation to avoid compilator race condition (crashes) with advanced redefinition
+     CompileBroker::stopCompilationBeforeEnhancedRedefinition();
+-    MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
+     VMThread::execute(&op);
+     CompileBroker::releaseCompilationAfterEnhancedRedefinition();
+@@ -473,9 +473,9 @@ JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
+ jvmtiError
+ JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_definitions) {
+   if (AllowEnhancedClassRedefinition) {
+    MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     // Stop compilation to avoid compilator race condition (crashes) with advanced redefinition
+     CompileBroker::stopCompilationBeforeEnhancedRedefinition();
+-    MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
+     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
+     VMThread::execute(&op);
+     CompileBroker::releaseCompilationAfterEnhancedRedefinition();
+diff --git a/src/hotspot/share/runtime/mutexLocker.cpp b/src/hotspot/share/runtime/mutexLocker.cpp
+index 16e91c85fd1..ae68611e992 100644
+--- a/src/hotspot/share/runtime/mutexLocker.cpp
+++ b/src/hotspot/share/runtime/mutexLocker.cpp
+@@ -95,6 +95,7 @@ Mutex*   Compile_lock                 = NULL;
+ Monitor* MethodCompileQueue_lock      = NULL;
+ Monitor* CompileThread_lock           = NULL;
+ Monitor* Compilation_lock             = NULL;
+Monitor* DcevmCompilation_lock        = NULL;
+ Mutex*   CompileTaskAlloc_lock        = NULL;
+ Mutex*   CompileStatistics_lock       = NULL;
+ Mutex*   DirectivesStack_lock         = NULL;
+@@ -327,6 +328,8 @@ void mutex_init() {
+     def(Compilation_lock           , PaddedMonitor, leaf,        false, Monitor::_safepoint_check_never);
+   }
+ 
+  def(DcevmCompilation_lock        , PaddedMonitor, nonleaf+1,   false, Monitor::_safepoint_check_never);
+
+ #if INCLUDE_JFR
+   def(JfrMsg_lock                  , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_always);
+   def(JfrBuffer_lock               , PaddedMutex  , leaf,        true,  Monitor::_safepoint_check_never);
+diff --git a/src/hotspot/share/runtime/mutexLocker.hpp b/src/hotspot/share/runtime/mutexLocker.hpp
+index b41abcb82ae..a9530a3a0e9 100644
+--- a/src/hotspot/share/runtime/mutexLocker.hpp
+++ b/src/hotspot/share/runtime/mutexLocker.hpp
+@@ -99,6 +99,7 @@ extern Mutex*   Compile_lock;                    // a lock held when Compilation
+ extern Monitor* MethodCompileQueue_lock;         // a lock held when method compilations are enqueued, dequeued
+ extern Monitor* CompileThread_lock;              // a lock held by compile threads during compilation system initialization
+ extern Monitor* Compilation_lock;                // a lock used to pause compilation
+extern Monitor* DcevmCompilation_lock;           // a lock used to pause compilation from dcevm
+ extern Mutex*   CompileTaskAlloc_lock;           // a lock held when CompileTasks are allocated
+ extern Mutex*   CompileStatistics_lock;          // a lock held when updating compilation statistics
+ extern Mutex*   DirectivesStack_lock;            // a lock held when mutating the dirstack and ref counting directives
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0037-JBR-3964-now-G1-is-the-default-GC-in-AllowEnhancedCl.patch
+++ b/jb/project/tools/patches/dcevm/0037-JBR-3964-now-G1-is-the-default-GC-in-AllowEnhancedCl.patch
@@ -0,0 +1,29 @@
+From eda304d04f9d7ca3d8c488d0375c77eae989a268 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 5 Nov 2021 19:36:08 +0100
+Subject: [PATCH 37/44] JBR-3964 - now G1 is the default GC in
+ AllowEnhancedClassRedefinition
+
+---
+ src/hotspot/share/gc/shared/gcConfig.cpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/hotspot/share/gc/shared/gcConfig.cpp b/src/hotspot/share/gc/shared/gcConfig.cpp
+index 20e0ef9ee8a..aea0ae3759f 100644
+--- a/src/hotspot/share/gc/shared/gcConfig.cpp
+++ b/src/hotspot/share/gc/shared/gcConfig.cpp
+@@ -106,9 +106,9 @@ void GCConfig::fail_if_unsupported_gc_is_selected() {
+ }
+ 
+ void GCConfig::select_gc_ergonomically() {
+-  if (AllowEnhancedClassRedefinition && !UseConcMarkSweepGC && !UseG1GC) {
+  if (AllowEnhancedClassRedefinition && !UseConcMarkSweepGC && !UseSerialGC) {
+     // Enhanced class redefinition only supports serial GC at the moment
+-    FLAG_SET_ERGO(bool, UseSerialGC, true);
+    FLAG_SET_ERGO(bool, UseG1GC, true);
+   } else if (os::is_server_class_machine()) {
+ #if INCLUDE_G1GC
+     FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0038-Code-cleanup.patch
+++ b/jb/project/tools/patches/dcevm/0038-Code-cleanup.patch
@@ -0,0 +1,76 @@
+From 983a17c530f48d95cc5c48d548d991749d1d49e2 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sat, 6 Nov 2021 19:43:35 +0100
+Subject: [PATCH 38/44] Code cleanup
+
+---
+ src/hotspot/share/compiler/compileBroker.cpp             | 2 ++
+ src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp          | 5 ++---
+ src/hotspot/share/gc/shared/gcConfig.cpp                 | 2 +-
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 1 +
+ 4 files changed, 6 insertions(+), 4 deletions(-)
+
+diff --git a/src/hotspot/share/compiler/compileBroker.cpp b/src/hotspot/share/compiler/compileBroker.cpp
+index 448e9b1002b..23f3a16c589 100644
+--- a/src/hotspot/share/compiler/compileBroker.cpp
+++ b/src/hotspot/share/compiler/compileBroker.cpp
+@@ -2872,6 +2872,8 @@ void CompileBroker::print_heapinfo(outputStream* out, const char* function, size
+ }
+ 
+ void CompileBroker::stopCompilationBeforeEnhancedRedefinition() {
+  // There are hard to fix C1/C2 race conditions with dcevm. The easiest solution
+  // is to stop compilation.
+   if (AllowEnhancedClassRedefinition) {
+     MonitorLockerEx locker(DcevmCompilation_lock, Mutex::_no_safepoint_check_flag);
+     _compilation_stopped = true;
+diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
+index e7d830979f6..58d9a6015e7 100644
+--- a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
+++ b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
+@@ -114,7 +114,7 @@ void G1FullGCCompactTask::work(uint worker_id) {
+     }
+   }
+ 
+-  // TODO: (DCEV) check it
+  // TODO: (DCEVM) check it
+   G1ResetHumongousClosure hc(collector()->mark_bitmap());
+   G1CollectedHeap::heap()->heap_region_par_iterate_from_worker_offset(&hc, &_claimer, worker_id);
+   log_task("Compaction task", worker_id, start);
+@@ -146,8 +146,7 @@ void G1FullGCCompactTask::compact_region_dcevm(HeapRegion* hr, GrowableArray<Hea
+ void G1FullGCCompactTask::serial_compaction_dcevm() {
+   GCTraceTime(Debug, gc, phases) tm("Phase 4: Serial Compaction", collector()->scope()->timer());
+ 
+-  // compact remaining, not parallel compacted rescued oops using serial compact point
+-
+  // Clear allocated resources at compact points now, since all rescued oops are copied to destination.
+   for (uint i = 0; i < collector()->workers(); i++) {
+     G1FullGCCompactionPoint* cp = collector()->compaction_point(i);
+     DcevmSharedGC::clear_rescued_objects_heap(cp->rescued_oops_values());
+diff --git a/src/hotspot/share/gc/shared/gcConfig.cpp b/src/hotspot/share/gc/shared/gcConfig.cpp
+index aea0ae3759f..c056e564fa3 100644
+--- a/src/hotspot/share/gc/shared/gcConfig.cpp
+++ b/src/hotspot/share/gc/shared/gcConfig.cpp
+@@ -107,7 +107,7 @@ void GCConfig::fail_if_unsupported_gc_is_selected() {
+ 
+ void GCConfig::select_gc_ergonomically() {
+   if (AllowEnhancedClassRedefinition && !UseConcMarkSweepGC && !UseSerialGC) {
+-    // Enhanced class redefinition only supports serial GC at the moment
+    // (DCEVM) use G1 as default GC in Enhanced class redefinition
+     FLAG_SET_ERGO(bool, UseG1GC, true);
+   } else if (os::is_server_class_machine()) {
+ #if INCLUDE_G1GC
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 1e63561064a..ee6e6f1d8d5 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -548,6 +548,7 @@ void VM_EnhancedRedefineClasses::doit() {
+       if (log_is_enabled(Info, redefine, class, timer)) {
+         _timer_heap_iterate.start();
+       }
+      // returns after the iteration is finished
+       G1CollectedHeap::heap()->object_par_iterate(&objectClosure);
+       _timer_heap_iterate.stop();
+     } else {
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0039-JBR-4018-fix-zero-variant-compilation-issues.patch
+++ b/jb/project/tools/patches/dcevm/0039-JBR-4018-fix-zero-variant-compilation-issues.patch
@@ -0,0 +1,93 @@
+From 8eb32c4c4dd67aeaebae168e17201559ac0fb50f Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 21 Nov 2021 16:57:57 +0100
+Subject: [PATCH 39/44] JBR-4018 - fix zero variant compilation issues
+
+---
+ .../share/prims/jvmtiEnhancedRedefineClasses.cpp     | 12 ++++++++++++
+ src/hotspot/share/runtime/arguments.cpp              |  2 ++
+ 2 files changed, 14 insertions(+)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index ee6e6f1d8d5..c2721b2aab1 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -54,7 +54,9 @@
+ #include "utilities/events.hpp"
+ #include "oops/constantPool.inline.hpp"
+ #include "gc/cms/cmsHeap.hpp"
+#if INCLUDE_G1GC
+ #include "gc/g1/g1CollectedHeap.hpp"
+#endif
+ #include "gc/shared/dcevmSharedGC.hpp"
+ 
+ Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
+@@ -534,16 +536,21 @@ void VM_EnhancedRedefineClasses::doit() {
+     // mark such nmethod's as "scavengable".
+     // For now, mark all nmethod's as scavengable that are not scavengable already
+     if (ScavengeRootsInCode) {
+#if INCLUDE_G1GC
+       if (UseG1GC) {
+         // 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 {
+#endif
+         CodeCache::nmethods_do(mark_as_scavengable);
+#if INCLUDE_G1GC
+       }
+#endif
+     }
+ 
+     Universe::heap()->ensure_parsability(false);
+#if INCLUDE_G1GC
+     if (UseG1GC) {
+       if (log_is_enabled(Info, redefine, class, timer)) {
+         _timer_heap_iterate.start();
+@@ -552,19 +559,24 @@ void VM_EnhancedRedefineClasses::doit() {
+       G1CollectedHeap::heap()->object_par_iterate(&objectClosure);
+       _timer_heap_iterate.stop();
+     } else {
+#endif
+       if (log_is_enabled(Info, redefine, class, timer)) {
+         _timer_heap_iterate.start();
+       }
+       Universe::heap()->object_iterate(&objectClosure);
+       _timer_heap_iterate.stop();
+#if INCLUDE_G1GC
+     }
+#endif
+ 
+     Universe::root_oops_do(&oopClosureNoBarrier);
+ 
+#if INCLUDE_G1GC
+     if (UseG1GC) {
+       // this should work also for other GCs
+       CodeCache::nmethods_do(register_nmethod_g1);
+     }
+#endif
+ 
+   }
+   log_trace(redefine, class, obsolete, metadata)("After updating instances");
+diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
+index dce89a044e9..77238a4608d 100644
+--- a/src/hotspot/share/runtime/arguments.cpp
+++ b/src/hotspot/share/runtime/arguments.cpp
+@@ -3967,12 +3967,14 @@ jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
+   // Set object alignment values.
+   set_object_alignment();
+ 
+#ifndef ZERO
+   if (FlightRecorder) {
+     if (AllowEnhancedClassRedefinition) {
+       warning("EnhancedClassRedefinition was disabled, it is not allowed in FlightRecorder.");
+       AllowEnhancedClassRedefinition = false;
+     }
+   }
+#endif
+ 
+   setup_hotswap_agent();
+ 
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0040-JBR-3997-fix-_invokehandle-and-_invokedynamic-race-c.patch
+++ b/jb/project/tools/patches/dcevm/0040-JBR-3997-fix-_invokehandle-and-_invokedynamic-race-c.patch
@@ -0,0 +1,111 @@
+From 96862f74063229132611259eb35f523badd0c9e1 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 28 Nov 2021 11:10:58 +0100
+Subject: [PATCH 40/44] JBR-3997 - fix _invokehandle and _invokedynamic race
+ conditions
+
+Old clear mechanism of CpCacheEntry has cleared partially _flags and the
+entire _f1, but both values could be later used in interpreter for
+invocation. It ended up with various types of crashes. To prevent dcevm
+crashes, we keep the old _f1 and _flags values until they are resolved
+again. We need a new flag 'is_f1_null_dcevm_shift' indicating that _f1
+is NULL (while f1 keeps old value).
+---
+ src/hotspot/share/oops/cpCache.cpp        | 14 ++++----------
+ src/hotspot/share/oops/cpCache.hpp        |  8 ++++----
+ src/hotspot/share/oops/cpCache.inline.hpp |  7 ++++++-
+ 3 files changed, 14 insertions(+), 15 deletions(-)
+
+diff --git a/src/hotspot/share/oops/cpCache.cpp b/src/hotspot/share/oops/cpCache.cpp
+index 4318df227d1..52cf5fe5bdf 100644
+--- a/src/hotspot/share/oops/cpCache.cpp
+++ b/src/hotspot/share/oops/cpCache.cpp
+@@ -450,6 +450,8 @@ void ConstantPoolCacheEntry::set_method_handle_common(const constantPoolHandle&
+ 
+   release_set_f1(adapter());  // This must be the last one to set (see NOTE above)!
+ 
+  OrderAccess::release_store(&_flags, _flags & ~(1u << is_f1_null_dcevm_shift));
+
+   // The interpreter assembly code does not check byte_2,
+   // but it is used by is_resolved, method_if_resolved, etc.
+   set_bytecode_1(invoke_code);
+@@ -654,16 +656,8 @@ void ConstantPoolCacheEntry::clear_entry() {
+   _indices = constant_pool_index();
+ 
+   if (clearData) {
+-    if (!is_resolved_reference()) {
+-      _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
+-    // keep parameter size the same.
+-    // For example, it's used in TemplateInterpreterGenerator::generate_return_entry_for
+-    // Also, we need to keep flag marking entry as one containing resolved_reference
+-    _flags &= parameter_size_mask | (1 << is_resolved_ref_shift);
+-    _f1 = NULL;
+     // DCEVM: do not clear f1 now, since it can be used before cache entry is re-resolved
+    _flags |= (1 << is_f1_null_dcevm_shift);
+   }
+ }
+ 
+diff --git a/src/hotspot/share/oops/cpCache.hpp b/src/hotspot/share/oops/cpCache.hpp
+index 2a9eb978b43..bb4e40373b2 100644
+--- a/src/hotspot/share/oops/cpCache.hpp
+++ b/src/hotspot/share/oops/cpCache.hpp
+@@ -178,8 +178,9 @@ class ConstantPoolCacheEntry {
+     tos_state_bits             = 4,
+     tos_state_mask             = right_n_bits(tos_state_bits),
+     tos_state_shift            = BitsPerInt - tos_state_bits,  // see verify_tos_state_shift below
+-    // (DCEVM) We need to remember entries which has resolved reference indices as we don't want to clean them
+-    is_resolved_ref_shift      = 27,
+    // (DCEVM) dcevm additional indicator, that f1 is NULL. DCEVM need to keep the old value of the f1 until the
+    //         cache entry is reresolved to avoid race condition
+    is_f1_null_dcevm_shift     = 27,
+     // misc. option bits; can be any bit position in [16..27]
+     is_field_entry_shift       = 26,  // (F) is it a field or a method?
+     has_method_type_shift      = 25,  // (M) does the call site have a MethodType?
+@@ -213,7 +214,6 @@ 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;
+   }
+ 
+   void set_field(                                // sets entry to resolved field state
+@@ -363,7 +363,6 @@ class ConstantPoolCacheEntry {
+   bool is_method_entry() const                   { return (_flags & (1 << is_field_entry_shift))    == 0; }
+   bool is_field_entry() const                    { return (_flags & (1 << is_field_entry_shift))    != 0; }
+   bool is_long() const                           { return flag_state() == ltos; }
+-  bool is_resolved_reference() const             { return (_flags & (1 << is_resolved_ref_shift))   != 0; }
+   bool is_double() const                         { return flag_state() == dtos; }
+   TosState flag_state() const                    { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
+                                                    return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
+@@ -407,6 +406,7 @@ class ConstantPoolCacheEntry {
+ 
+   void verify_just_initialized(bool f2_used);
+   void reinitialize(bool f2_used);
+
+ };
+ 
+ 
+diff --git a/src/hotspot/share/oops/cpCache.inline.hpp b/src/hotspot/share/oops/cpCache.inline.hpp
+index c876e669de3..2cf48c67a9f 100644
+--- a/src/hotspot/share/oops/cpCache.inline.hpp
+++ b/src/hotspot/share/oops/cpCache.inline.hpp
+@@ -65,7 +65,12 @@ inline Klass* ConstantPoolCacheEntry::f1_as_klass() const {
+   return (Klass*)f1;
+ }
+ 
+-inline bool ConstantPoolCacheEntry::is_f1_null() const { Metadata* f1 = f1_ord(); return f1 == NULL; }
+inline bool ConstantPoolCacheEntry::is_f1_null() const {
+  Metadata* f1 = f1_ord();
+  intx flags = flags_ord();
+  return f1 == NULL || (flags & (1 << is_f1_null_dcevm_shift)) != 0;
+}
+
+ 
+ inline bool ConstantPoolCacheEntry::has_appendix() const {
+   return (!is_f1_null()) && (_flags & (1 << has_appendix_shift)) != 0;
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0041-JBR-3997-change-order-of-clear-is_f1_null_dcevm_shif.patch
+++ b/jb/project/tools/patches/dcevm/0041-JBR-3997-change-order-of-clear-is_f1_null_dcevm_shif.patch
@@ -0,0 +1,30 @@
+From be92eb0b4440f27298330581ec34b17fdac14da9 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Mon, 29 Nov 2021 17:28:36 +0100
+Subject: [PATCH 41/44] JBR-3997 - change order of clear is_f1_null_dcevm_shift
+ and set _f1
+
+---
+ src/hotspot/share/oops/cpCache.cpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/hotspot/share/oops/cpCache.cpp b/src/hotspot/share/oops/cpCache.cpp
+index 52cf5fe5bdf..a223fc17cae 100644
+--- a/src/hotspot/share/oops/cpCache.cpp
+++ b/src/hotspot/share/oops/cpCache.cpp
+@@ -448,10 +448,10 @@ void ConstantPoolCacheEntry::set_method_handle_common(const constantPoolHandle&
+     resolved_references->obj_at_put(method_type_index, method_type());
+   }
+ 
+-  release_set_f1(adapter());  // This must be the last one to set (see NOTE above)!
+-
+   OrderAccess::release_store(&_flags, _flags & ~(1u << is_f1_null_dcevm_shift));
+ 
+  release_set_f1(adapter());  // This must be the last one to set (see NOTE above)!
+
+   // The interpreter assembly code does not check byte_2,
+   // but it is used by is_resolved, method_if_resolved, etc.
+   set_bytecode_1(invoke_code);
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0042-JBR-4125-fix-wrong-addition-of-java.lang.Object-as-s.patch
+++ b/jb/project/tools/patches/dcevm/0042-JBR-4125-fix-wrong-addition-of-java.lang.Object-as-s.patch
@@ -0,0 +1,26 @@
+From 73b3c3daf4f521c103f8474708add0717adcda70 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Sun, 19 Dec 2021 10:14:48 +0100
+Subject: [PATCH 42/44] JBR-4125 - fix wrong addition of java.lang.Object as
+ superclass
+
+---
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index c2721b2aab1..66600206aab 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -1018,7 +1018,7 @@ int VM_EnhancedRedefineClasses::calculate_redefinition_flags(InstanceKlass* new_
+ 
+     cur_klass = new_class->super();
+     while (cur_klass != NULL) {
+-      if (!the_class->is_subclass_of(cur_klass->old_version())) {
+      if (!the_class->is_subclass_of(cur_klass->is_redefining() ? cur_klass->old_version() : cur_klass)) {
+         log_info(redefine, class, load)("added super class %s", cur_klass->name()->as_C_string());
+         result = result | Klass::ModifyClass | Klass::ModifyInstances;
+       }
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0043-JBR-4148-removed-meaningless-copying-of-data-to-itse.patch
+++ b/jb/project/tools/patches/dcevm/0043-JBR-4148-removed-meaningless-copying-of-data-to-itse.patch
@@ -0,0 +1,26 @@
+From d211ae68e72eac8b868c9b198929f73f385c18d7 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Wed, 29 Dec 2021 17:44:02 +0100
+Subject: [PATCH 43/44] JBR-4148 - removed meaningless copying of data to
+ itself
+
+---
+ src/hotspot/share/oops/method.cpp | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/src/hotspot/share/oops/method.cpp b/src/hotspot/share/oops/method.cpp
+index 2af3e71635e..55eb4e8c294 100644
+--- a/src/hotspot/share/oops/method.cpp
+++ b/src/hotspot/share/oops/method.cpp
+@@ -1448,8 +1448,6 @@ methodHandle Method::clone_with_new_data(const methodHandle& m, u_char* new_code
+ 
+   // Reset correct method/const method, method size, and parameter info
+   newm->set_constMethod(newcm);
+-  newm->set_new_version(newm->new_version());
+-  newm->set_old_version(newm->old_version());
+   newm->constMethod()->set_code_size(new_code_length);
+   newm->constMethod()->set_constMethod_size(new_const_method_size);
+   assert(newm->code_size() == new_code_length, "check");
+-- 
+2.23.0
+
--- a/jb/project/tools/patches/dcevm/0044-Fix-compilation-problem-remove-notice_modification.patch
+++ b/jb/project/tools/patches/dcevm/0044-Fix-compilation-problem-remove-notice_modification.patch
@@ -0,0 +1,29 @@
+From 71dea432524297595b3193943981e18bcf35e822 Mon Sep 17 00:00:00 2001
+From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
+Date: Fri, 28 Jan 2022 18:52:58 +0100
+Subject: [PATCH 44/44] Fix compilation problem - remove notice_modification
+ SystemDictionary::notice_modification was removed in jdk11.0.4, it contained
+ number of redefinition counter for informational purposes
+
+---
+ src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+index 66600206aab..ece6e71b209 100644
+--- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
+@@ -658,8 +658,8 @@ void VM_EnhancedRedefineClasses::doit() {
+   // TODO: explain...
+   ciObjectFactory::resort_shared_ci_metadata();
+ 
+-  // Disable any dependent concurrent compilations
+-  SystemDictionary::notice_modification();
+  // notice_modification() was removed in 11.0.14
+  // SystemDictionary::notice_modification();
+ 
+   // Set flag indicating that some invariants are no longer true.
+   // See jvmtiExport.hpp for detailed explanation.
+-- 
+2.23.0
+
--- a/jb/project/tools/windows/scripts/mkimages_aarch64.sh
+++ b/jb/project/tools/windows/scripts/mkimages_aarch64.sh
@@ -0,0 +1,163 @@
+#!/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:
+#                        jcef - the release bundles with jcef
+#                        dcevm - the release bundles with dcevm patches
+#                        nomod - the release bundles without any additional modules (jcef)
+#                        fd - the fastdebug bundles which also include the jcef module
+#
+# jbrsdk-${JBSDK_VERSION}-windows-aarch64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-windows-aarch64-b${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:
+#   MODULAR_SDK_PATH - specifies the path to the directory where imported modules are located.
+#                      By default imported modules should be located in ./modular-sdk.
+#   JCEF_PATH        - specifies the path to the directory with JCEF binaries.
+#                      By default JCEF binaries should be located in ./jcef_win_aarch64.
+#   BOOT_JDK         - specifies the path to the directory with a ready build of OpenJDK 11 with
+#                      the same architecture as the build system. It will be used as the boot jdk.
+
+while getopts ":i?" o; do
+    case "${o}" in
+        i)
+            i="incremental build"
+            INC_BUILD=1
+            ;;
+    esac
+done
+shift $((OPTIND-1))
+
+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)
+WITH_IMPORT_MODULES="--with-import-modules=${MODULAR_SDK_PATH:=${WORK_DIR}/modular-sdk}"
+JCEF_PATH=${JCEF_PATH:=${WORK_DIR}/jcef_win_aarch64}
+TOOLCHAIN_VERSION=${TOOLCHAIN_VERSION:=2019}
+
+source jb/project/tools/common.sh
+
+function do_configure {
+  sh ./configure \
+    --openjdk-target=aarch64-unknown-cygwin \
+    --disable-warnings-as-errors \
+    $WITH_DEBUG_LEVEL \
+    --with-vendor-name="${VENDOR_NAME}" \
+    --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+    --with-jvm-features=shenandoahgc \
+    --with-version-pre= \
+    --with-version-build=${JDK_BUILD_NUMBER} \
+    --with-version-opt=b${build_number} \
+    $WITH_IMPORT_MODULES \
+    --with-toolchain-version=${TOOLCHAIN_VERSION} \
+    --with-boot-jdk=${BOOT_JDK} \
+    --with-build-jdk=${BOOT_JDK} \
+    --disable-ccache \
+    --enable-cds=yes || do_exit $?
+}
+
+function create_jbr {
+
+  JBR_BUNDLE=jbr_${bundle_type}
+
+  case "${bundle_type}" in
+  "jcef" | "dcevm" | "nomod" | "fd")
+    JBR_BASE_NAME=jbr_${bundle_type}-${JBSDK_VERSION}
+    ;;
+  *)
+    echo "***ERR*** bundle was not specified" && do_exit 1
+    ;;
+  esac
+
+  echo "Exclude jdk.internal.vm.compiler and jdk.aot (because aot is not supported yet)"
+  cat modules.list | \
+    grep -v "jdk.internal.vm.compiler\|jdk.aot" \
+    > modules_tmp.list
+
+  rm -rf ${JBR_BUNDLE}
+
+  echo Running jlink....
+  ${BOOT_JDK}/bin/jlink \
+    --module-path ${JSDK}/jmods --no-man-pages --compress=2 \
+    --add-modules $(xargs < modules_tmp.list | sed 's/ //g' | sed 's/,\?$//g') --output ${JBR_BUNDLE} || do_exit $?
+  if [[ "${bundle_type}" == *jcef* ]] || [[ "${bundle_type}" == *dcevm* ]] || [[ "${bundle_type}" == fd ]]
+  then
+    rsync -av ${JCEF_PATH}/ ${JBR_BUNDLE}/bin --exclude="modular-sdk" || do_exit $?
+  fi
+  echo Modifying release info ...
+  cat ${JSDK}/release | tr -d '\r' | grep -v 'JAVA_VERSION' | grep -v 'MODULES' >> ${JBR_BUNDLE}/release
+}
+
+JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}
+WITH_DEBUG_LEVEL="--with-debug-level=release"
+RELEASE_NAME=windows-aarch64-normal-server-release
+JBSDK=${JBRSDK_BASE_NAME}-windows-aarch64-b${build_number}
+case "$bundle_type" in
+  "jcef")
+    git apply -p0 < jb/project/tools/patches/add_jcef_module_winaarch64.patch || do_exit $?
+    do_reset_changes=1
+    ;;
+  "dcevm")
+    HEAD_REVISION=$(git rev-parse HEAD)
+    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
+    do_reset_dcevm=1
+    git apply -p0 < jb/project/tools/patches/add_jcef_module_winaarch64.patch || do_exit $?
+    do_reset_changes=1
+    ;;
+  "nomod")
+    WITH_IMPORT_MODULES=""
+    ;;
+  "fd")
+    git apply -p0 < jb/project/tools/patches/add_jcef_module_winaarch64.patch || do_exit $?
+    do_reset_changes=1
+    WITH_DEBUG_LEVEL="--with-debug-level=fastdebug"
+    RELEASE_NAME=windows-aarch64-normal-server-fastdebug
+    JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}-fastdebug
+    JBSDK=${JBRSDK_BASE_NAME}-windows-aarch64-fastdebug-b${build_number}
+    ;;
+  *)
+    echo "***ERR*** bundle was not specified" && do_exit 1
+    ;;
+esac
+
+if [ -z "$INC_BUILD" ]; then
+  do_configure || do_exit $?
+  if [ "${bundle_type}" == "jcef" ]; then
+    make LOG=info clean images test-image CONF=$RELEASE_NAME || do_exit $?
+  else
+    make LOG=info clean images CONF=$RELEASE_NAME || do_exit $?
+  fi
+else
+  if [ "${bundle_type}" == "jcef" ]; then
+    make LOG=info images test-image CONF=$RELEASE_NAME || do_exit $?
+  else
+    make LOG=info images CONF=$RELEASE_NAME || do_exit $?
+  fi
+fi
+
+JSDK=build/$RELEASE_NAME/images/jdk
+BASE_DIR=build/$RELEASE_NAME/images
+JBRSDK_BUNDLE=jbrsdk
+
+rm -rf ${BASE_DIR}/${JBRSDK_BUNDLE} && rsync -a --exclude demo --exclude sample ${JSDK}/ ${JBRSDK_BUNDLE} || do_exit $?
+if [[ "${bundle_type}" == *jcef* ]] || [[ "${bundle_type}" == *dcevm* ]] || [[ "${bundle_type}" == fd ]]
+then
+  rsync -av ${JCEF_PATH}/ ${JBRSDK_BUNDLE}/bin --exclude='modular-sdk' || do_exit $?
+  sed 's/JBR/JBRSDK/g' ${JSDK}/release > release
+  mv release ${JBRSDK_BUNDLE}/release
+fi
+
+create_jbr || do_exit $?
+
+do_exit 0
--- a/jb/project/tools/windows/scripts/mkimages_x64.sh
+++ b/jb/project/tools/windows/scripts/mkimages_x64.sh
@@ -6,8 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to be built; possible values:
 #                        jcef - the release bundles with jcef
-#                        jfx - the release bundles with javafx
-#                        jcef_jfx - the release bundles with jcef and javafx
 #                        dcevm - the release bundles with dcevm patches
 #                        nomod - the release bundles without any additional modules (jcef)
 #                        fd - the fastdebug bundles which also include the jcef module
@@ -26,6 +24,16 @@
 #   JCEF_PATH - specifies the path to the directory with JCEF binaries.
 #               By default JCEF binaries should be located in ./jcef_win_x64

+while getopts ":i?" o; do
+    case "${o}" in
+        i)
+            i="incremental build"
+            INC_BUILD=1
+            ;;
+    esac
+done
+shift $((OPTIND-1))
+
 JBSDK_VERSION=$1
 JDK_BUILD_NUMBER=$2
 build_number=$3
@@ -38,17 +46,31 @@ TOOLCHAIN_VERSION=${TOOLCHAIN_VERSION:=2015}

 source jb/project/tools/common.sh

+function do_configure {
+  sh ./configure \
+    --disable-warnings-as-errors \
+    $WITH_DEBUG_LEVEL \
+    --with-vendor-name="${VENDOR_NAME}" \
+    --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
+    --with-jvm-features=shenandoahgc \
+    --with-version-pre= \
+    --with-version-build=${JDK_BUILD_NUMBER} \
+    --with-version-opt=b${build_number} \
+    $WITH_IMPORT_MODULES \
+    --with-toolchain-version=${TOOLCHAIN_VERSION} \
+    --with-boot-jdk=${BOOT_JDK} \
+    --disable-ccache \
+    --enable-cds=yes || do_exit $?
+}
+
 function create_jbr {

  JBR_BUNDLE=jbr_${bundle_type}

  case "${bundle_type}" in
-  "jfx" | "jcef" | "dcevm" | "nomod" | "fd")
+  "jcef" | "dcevm" | "nomod" | "fd")
    JBR_BASE_NAME=jbr_${bundle_type}-${JBSDK_VERSION}
    ;;
-  "jfx_jcef")
-    JBR_BASE_NAME=jbr-${JBSDK_VERSION}
-    ;;
  *)
    echo "***ERR*** bundle was not specified" && do_exit 1
    ;;
@@ -73,19 +95,10 @@ WITH_DEBUG_LEVEL="--with-debug-level=release"
 RELEASE_NAME=windows-x86_64-normal-server-release
 JBSDK=${JBRSDK_BASE_NAME}-windows-x64-b${build_number}
 case "$bundle_type" in
-  "jfx")
-    git apply -p0 < jb/project/tools/patches/add_jfx_module.patch || do_exit $?
-    do_reset_changes=1
-    ;;
  "jcef")
    git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
    do_reset_changes=1
    ;;
-  "jfx_jcef")
-    git apply -p0 < jb/project/tools/patches/add_jfx_module.patch || do_exit $?
-    git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
-    do_reset_changes=1
-    ;;
  "dcevm")
    HEAD_REVISION=$(git rev-parse HEAD)
    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
@@ -109,25 +122,19 @@ case "$bundle_type" in
    ;;
 esac

-sh ./configure \
-  --disable-warnings-as-errors \
-  $WITH_DEBUG_LEVEL \
-  --with-vendor-name="${VENDOR_NAME}" \
-  --with-vendor-version-string="${VENDOR_VERSION_STRING}" \
-  --with-jvm-features=shenandoahgc \
-  --with-version-pre= \
-  --with-version-build=${JDK_BUILD_NUMBER} \
-  --with-version-opt=b${build_number} \
-  $WITH_IMPORT_MODULES \
-  --with-toolchain-version=${TOOLCHAIN_VERSION} \
-  --with-boot-jdk=${BOOT_JDK} \
-  --disable-ccache \
-  --enable-cds=yes || do_exit $?
-
-if [ "${bundle_type}" == "jcef" ]; then
-  make LOG=info clean images test-image CONF=$RELEASE_NAME || do_exit $?
+if [ -z "$INC_BUILD" ]; then
+  do_configure || do_exit $?
+  if [ "${bundle_type}" == "jcef" ]; then
+    make LOG=info CONF=$RELEASE_NAME clean images test-image || do_exit $?
+  else
+    make LOG=info CONF=$RELEASE_NAME clean images || do_exit $?
+  fi
 else
-  make LOG=info clean images CONF=$RELEASE_NAME || do_exit $?
+  if [ "${bundle_type}" == "jcef" ]; then
+    make LOG=info CONF=$RELEASE_NAME images test-image || do_exit $?
+  else
+    make LOG=info CONF=$RELEASE_NAME images || do_exit $?
+  fi
 fi

 JSDK=build/$RELEASE_NAME/images/jdk
--- a/jb/project/tools/windows/scripts/mkimages_x86.sh
+++ b/jb/project/tools/windows/scripts/mkimages_x86.sh
@@ -6,7 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to bu built; possible values:
 #                        jcef - the bundles 1) jbr with jcef+javafx, 2) jbrsdk and 3) test will be created
-#                        jfx  - the bundle 1) jbr with javafx only will be created
 #
 # jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
 # jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
--- a/jb/project/tools/windows/scripts/pack_aarch64.sh
+++ b/jb/project/tools/windows/scripts/pack_aarch64.sh
@@ -0,0 +1,83 @@
+#!/bin/bash -x
+
+# The following parameters must be specified:
+#   JBSDK_VERSION    - specifies major version of OpenJDK e.g. 11_0_6 (instead of dots '.' underbars "_" are used)
+#   JDK_BUILD_NUMBER - specifies update release of OpenJDK build or the value of --with-version-build argument to configure
+#   build_number     - specifies the number of JetBrainsRuntime build
+#   bundle_type      - specifies bundle to be built; possible values:
+#                        jcef - the release bundles with jcef
+#                        dcevm - the release bundles with dcevm patches
+#                        nomod - the release bundles without any additional modules (jcef)
+#                        fd - the fastdebug bundles which also include the jcef module
+#
+# jbrsdk-${JBSDK_VERSION}-windows-aarch64-b${build_number}.tar.gz
+# jbr-${JBSDK_VERSION}-windows-aarch64-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:
+#   MODULAR_SDK_PATH - specifies the path to the directory where imported modules are located.
+#                      By default imported modules should be located in ./modular-sdk.
+#   JCEF_PATH        - specifies the path to the directory with JCEF binaries.
+#                      By default JCEF binaries should be located in ./jcef_win_aarch64.
+
+JBSDK_VERSION=$1
+JDK_BUILD_NUMBER=$2
+build_number=$3
+bundle_type=$4
+
+source jb/project/tools/common.sh
+
+function pack_jbr {
+
+  JBR_BUNDLE=jbr_${bundle_type}
+
+  case "${bundle_type}" in
+  "jcef" | "dcevm" | "nomod" | "fd")
+    JBR_BASE_NAME=jbr_${bundle_type}-${JBSDK_VERSION}
+    ;;
+  *)
+    echo "***ERR*** bundle was not specified" && do_exit 1
+    ;;
+  esac
+
+  JBR=$JBR_BASE_NAME-windows-aarch64-b$build_number
+  echo Creating $JBR.tar.gz ...
+  chmod -R ug+rwx,o+rx ${BASE_DIR}/${JBR_BUNDLE}
+  cp -R ${BASE_DIR}/${JBR_BUNDLE} ${BASE_DIR}/jbr
+  /usr/bin/tar -czf $JBR.tar.gz -C $BASE_DIR jbr || do_exit $?
+}
+
+JBRSDK_BASE_NAME=jbrsdk-${JBSDK_VERSION}
+WITH_DEBUG_LEVEL="--with-debug-level=release"
+RELEASE_NAME=windows-aarch64-normal-server-release
+JBSDK=${JBRSDK_BASE_NAME}-windows-aarch64-b${build_number}
+case "$bundle_type" in
+  "fd")
+    WITH_DEBUG_LEVEL="--with-debug-level=fastdebug"
+    RELEASE_NAME=windows-aarch64-normal-server-fastdebug
+    JBSDK=${JBRSDK_BASE_NAME}-windows-aarch64-fastdebug-b${build_number}
+    ;;
+esac
+
+IMAGES_DIR=build/$RELEASE_NAME/images
+JSDK=$IMAGES_DIR/jdk
+BASE_DIR=.
+
+if [ "${bundle_type}" == "jcef" ] || [ "${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 $bundle_type
+
+if [ "$bundle_type" == "jcef" ]; then
+  JBRSDK_TEST=$JBRSDK_BASE_NAME-windows-test-aarch64-b$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 $?
+fi
--- a/jb/project/tools/windows/scripts/pack_x64.sh
+++ b/jb/project/tools/windows/scripts/pack_x64.sh
@@ -6,8 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to be built; possible values:
 #                        jcef - the release bundles with jcef
-#                        jfx - the release bundles with javafx
-#                        jcef_jfx - the release bundles with jcef and javafx
 #                        dcevm - the release bundles with dcevm patches
 #                        nomod - the release bundles without any additional modules (jcef)
 #                        fd - the fastdebug bundles which also include the jcef module
@@ -38,12 +36,9 @@ function pack_jbr {
  JBR_BUNDLE=jbr_${bundle_type}

  case "${bundle_type}" in
-  "jfx" | "jcef" | "dcevm" | "nomod" | "fd")
+  "jcef" | "dcevm" | "nomod" | "fd")
    JBR_BASE_NAME=jbr_${bundle_type}-${JBSDK_VERSION}
    ;;
-  "jfx_jcef")
-    JBR_BASE_NAME=jbr-${JBSDK_VERSION}
-    ;;
  *)
    echo "***ERR*** bundle was not specified" && do_exit 1
    ;;
--- a/jb/project/tools/windows/scripts/pack_x86.sh
+++ b/jb/project/tools/windows/scripts/pack_x86.sh
@@ -6,7 +6,6 @@
 #   build_number     - specifies the number of JetBrainsRuntime build
 #   bundle_type      - specifies bundle to bu built; possible values:
 #                        jcef - the bundles 1) jbr with jcef+javafx, 2) jbrsdk and 3) test will be created
-#                        jfx  - the bundle 1) jbr with javafx only will be created
 #
 # jbrsdk-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
 # jbr-${JBSDK_VERSION}-osx-x64-b${build_number}.tar.gz
--- a/make/Docs.gmk
+++ b/make/Docs.gmk
@@ -168,14 +168,6 @@ JAVADOC_TOP := \
    font-family: DejaVu Sans, Arial, Helvetica, sans-serif; \
    font-weight: normal;">$(DRAFT_TEXT)</div>

-JDK_INDEX_CONTENT := \
-    <!DOCTYPE html> \
-    <html lang="en"> \
-    <head> \
-    <meta http-equiv="refresh" content="0;url=api/index.html"> \
-    </head> \
-    </html>
-
 ################################################################################
 # JDK javadoc titles/text snippets

@@ -485,14 +477,7 @@ $(eval $(call SetupApiDocsGeneration, REFERENCE_API, \

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

-JDK_INDEX_HTML := $(DOCS_OUTPUTDIR)/index.html
-
-$(JDK_INDEX_HTML):
-	$(ECHO) '$(JDK_INDEX_CONTENT)' > $@
-
-JDK_INDEX_TARGETS += $(JDK_INDEX_HTML)
-
-# Copy the global resources
+# Copy the global resources, including the top-level redirect index.html
 GLOBAL_SPECS_RESOURCES_DIR := $(TOPDIR)/make/data/docs-resources/
 $(eval $(call SetupCopyFiles, COPY_GLOBAL_RESOURCES, \
    SRC := $(GLOBAL_SPECS_RESOURCES_DIR), \
--- a/make/JBRApi.gmk
+++ b/make/JBRApi.gmk
@@ -0,0 +1,85 @@
+#
+# Copyright 2000-2021 JetBrains s.r.o.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include $(SPEC)
+include MakeBase.gmk
+include JavaCompilation.gmk
+include SetupJavaCompilers.gmk
+
+JBR_API_ROOT_DIR   := $(TOPDIR)/src/jetbrains.api
+JBR_API_TOOLS_DIR  := $(JBR_API_ROOT_DIR)/tools
+JBR_API_SRC_DIR    := $(JBR_API_ROOT_DIR)/src
+JBR_API_OUTPUT_DIR := $(OUTPUTDIR)/jbr-api
+JBR_API_GENSRC_DIR := $(JBR_API_OUTPUT_DIR)/gensrc
+JBR_API_BIN_DIR    := $(JBR_API_OUTPUT_DIR)/bin
+JBR_API_VERSION_PROPERTIES := $(JBR_API_ROOT_DIR)/version.properties
+JBR_API_VERSION_GENSRC     := $(JBR_API_OUTPUT_DIR)/jbr-api.version
+JBR_API_GENSRC_BATCH       := $(JBR_API_VERSION_GENSRC)
+
+JBR_API_SRC_FILES := $(call FindFiles, $(JBR_API_SRC_DIR))
+JBR_API_GENSRC_FILES := $(foreach f, $(call FindFiles, $(JBR_API_SRC_DIR)), \
+    $(JBR_API_GENSRC_DIR)/$(call RelativePath, $f, $(JBR_API_SRC_DIR)))
+
+ifeq ($(JBR_API_JBR_VERSION),)
+  JBR_API_JBR_VERSION := <DEVELOPMENT>
+  JBR_API_FAIL_ON_HASH_MISMATCH := false
+else
+  .PHONY: $(JBR_API_VERSION_PROPERTIES)
+  JBR_API_FAIL_ON_HASH_MISMATCH := true
+endif
+
+ARCHIVE_BUILD_JBR_API_BIN := $(JBR_API_BIN_DIR)
+$(eval $(call SetupJavaCompilation, BUILD_JBR_API, \
+    SETUP := BOOT_JAVAC, \
+    SRC := $(JBR_API_GENSRC_DIR), \
+    EXTRA_FILES := $(JBR_API_GENSRC_FILES), \
+    DEPENDS := $(JBR_API_GENSRC_FILES), \
+    BIN := $(JBR_API_BIN_DIR), \
+    JAR := $(JBR_API_OUTPUT_DIR)/jbr-api.jar, \
+))
+
+$(eval $(call SetupJarArchive, BUILD_JBR_API_SOURCES_JAR, \
+    DEPENDENCIES := $(JBR_API_GENSRC_FILES), \
+    SRCS := $(JBR_API_GENSRC_DIR), \
+    JAR := $(JBR_API_OUTPUT_DIR)/jbr-api-sources.jar, \
+    SUFFIXES := .java, \
+    BIN := $(JBR_API_BIN_DIR), \
+))
+
+# Grouped targets may not be supported, so hack dependencies: sources -> version file -> generated sources
+$(JBR_API_VERSION_GENSRC): $(JBR_API_SRC_FILES) $(JBR_API_VERSION_PROPERTIES) $(JBR_API_TOOLS_DIR)/Gensrc.java
+	$(ECHO) Generating sources for JBR API
+	$(JAVA_CMD) $(JAVA_FLAGS_SMALL) "$(JBR_API_TOOLS_DIR)/Gensrc.java" \
+	    "$(TOPDIR)/src" "$(JBR_API_OUTPUT_DIR)" "$(JBR_API_JBR_VERSION)"
+$(JBR_API_GENSRC_FILES): $(JBR_API_VERSION_GENSRC)
+	$(TOUCH) $@
+
+jbr-api-check-version: $(JBR_API_GENSRC_FILES) $(JBR_API_VERSION_PROPERTIES)
+	$(JAVA_CMD) $(JAVA_FLAGS_SMALL) "$(JBR_API_TOOLS_DIR)/CheckVersion.java" \
+	    "$(JBR_API_ROOT_DIR)" "$(JBR_API_GENSRC_DIR)" "$(JBR_API_FAIL_ON_HASH_MISMATCH)"
+
+jbr-api: $(BUILD_JBR_API) $(BUILD_JBR_API_SOURCES_JAR) jbr-api-check-version
+
+.PHONY: jbr-api jbr-api-check-version
+
+ifneq ($(JBR_API_CONF_FILE),)
+  $(JBR_API_CONF_FILE): $(JBR_API_GENSRC_FILES)
+	$(ECHO) "VERSION=`$(CAT) $(JBR_API_VERSION_GENSRC)`" > $(JBR_API_CONF_FILE)
+	$(ECHO) "JAR=$(JBR_API_OUTPUT_DIR)/jbr-api.jar" >> $(JBR_API_CONF_FILE)
+	$(ECHO) "SOURCES_JAR=$(JBR_API_OUTPUT_DIR)/jbr-api-sources.jar" >> $(JBR_API_CONF_FILE)
+  jbr-api: $(JBR_API_CONF_FILE)
+  .PHONY: $(JBR_API_CONF_FILE)
+endif
--- a/make/Main.gmk
+++ b/make/Main.gmk
@@ -1254,6 +1254,13 @@ ALL_TARGETS += clean clean-docs clean-compile-commands dist-clean $(CLEAN_DIR_TA
    $(CLEAN_SUPPORT_DIR_TARGETS) $(CLEAN_TEST_TARGETS) $(CLEAN_PHASE_TARGETS) \
    $(CLEAN_MODULE_TARGETS) $(CLEAN_MODULE_PHASE_TARGETS)

+################################################################################
+# JBR API
+
+jbr-api:
+	+($(CD) $(TOPDIR)/make && $(MAKE) $(MAKE_ARGS) -f JBRApi.gmk jbr-api)
+ALL_TARGETS += jbr-api
+
 ################################################################################
 # Declare *-only targets for each normal target
 $(foreach t, $(ALL_TARGETS), $(eval $(t)-only: $(t)))
--- a/make/RunTests.gmk
+++ b/make/RunTests.gmk
@@ -276,7 +276,7 @@ $(eval $(call SetTestOpt,TIMEOUT_FACTOR,JTREG))

 $(eval $(call ParseKeywordVariable, JTREG, \
    SINGLE_KEYWORDS := JOBS TIMEOUT_FACTOR TEST_MODE ASSERT VERBOSE RETAIN \
-        MAX_MEM, \
+        MAX_MEM RETRY_COUNT, \
    STRING_KEYWORDS := OPTIONS JAVA_OPTIONS VM_OPTIONS KEYWORDS \
        EXTRA_PROBLEM_LISTS AOT_MODULES, \
 ))
@@ -312,8 +312,6 @@ langtools_JTREG_PROBLEM_LIST += $(TOPDIR)/test/langtools/ProblemList.txt
 nashorn_JTREG_PROBLEM_LIST += $(TOPDIR)/test/nashorn/ProblemList.txt
 hotspot_JTREG_PROBLEM_LIST += $(TOPDIR)/test/hotspot/jtreg/ProblemList.txt

-langtools_JTREG_MAX_MEM := 768m
-
 ################################################################################
 # Parse test selection
 #
@@ -532,6 +530,7 @@ define SetupRunGtestTestBody
 	    $$(FIXPATH) $$(TEST_IMAGE_DIR)/hotspot/gtest/$$($1_VARIANT)/gtestLauncher \
 	        -jdk $(JDK_IMAGE_DIR) $$($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) $$($1_TEST_RESULTS_DIR)/gtest.txt) \
@@ -626,7 +625,7 @@ define SetupRunJtregTestBody
  # Convert JTREG_foo into $1_JTREG_foo with a suitable value.
  $$(eval $$(call SetJtregValue,$1,JTREG_TEST_MODE,agentvm))
  $$(eval $$(call SetJtregValue,$1,JTREG_ASSERT,true))
-  $$(eval $$(call SetJtregValue,$1,JTREG_MAX_MEM,512m))
+  $$(eval $$(call SetJtregValue,$1,JTREG_MAX_MEM,768m))
  $$(eval $$(call SetJtregValue,$1,JTREG_NATIVEPATH))
  $$(eval $$(call SetJtregValue,$1,JTREG_BASIC_OPTIONS))
  $$(eval $$(call SetJtregValue,$1,JTREG_PROBLEM_LIST))
@@ -642,7 +641,7 @@ define SetupRunJtregTestBody

  # Make sure MaxRAMPercentage is high enough to not cause OOM or swapping since
  # we may end up with a lot of JVM's
-  $1_JTREG_MAX_RAM_PERCENTAGE := $$(shell $$(EXPR) 25 / $$($1_JTREG_JOBS))
+  $1_JTREG_MAX_RAM_PERCENTAGE := $$(shell $(AWK) 'BEGIN { print 25 / $$($1_JTREG_JOBS); }')

  # SPARC is in general slower per core so need to scale up timeouts a bit.
  ifeq ($(OPENJDK_TARGET_CPU_ARCH), sparc)
@@ -652,6 +651,7 @@ define SetupRunJtregTestBody
  endif
  JTREG_VERBOSE ?= fail,error,summary
  JTREG_RETAIN ?= fail,error
+  JTREG_RETRY_COUNT ?= 0

  ifneq ($$($1_JTREG_MAX_MEM), 0)
    $1_JTREG_BASIC_OPTIONS += -vmoption:-Xmx$$($1_JTREG_MAX_MEM)
@@ -741,24 +741,43 @@ define SetupRunJtregTestBody
  clean-workdir-$1:
 	$$(RM) -r $$($1_TEST_SUPPORT_DIR)

+  $1_COMMAND_LINE := \
+      $$(JAVA) $$($1_JTREG_LAUNCHER_OPTIONS) \
+          -Dprogram=jtreg -jar $$(JT_HOME)/lib/jtreg.jar \
+          $$($1_JTREG_BASIC_OPTIONS) \
+          -testjdk:$$(JDK_IMAGE_DIR) \
+          -dir:$$(JTREG_TOPDIR) \
+          -reportDir:$$($1_TEST_RESULTS_DIR) \
+          -workDir:$$($1_TEST_SUPPORT_DIR) \
+          -status:$$$${JTREG_STATUS} \
+          $$(JTREG_OPTIONS) \
+          $$(JTREG_FAILURE_HANDLER_OPTIONS) \
+          $$($1_TEST_NAME) \
+      && $$(ECHO) $$$$? > $$($1_EXITCODE) \
+      || $$(ECHO) $$$$? > $$($1_EXITCODE)
+
+
+  ifneq ($$(JTREG_RETRY_COUNT), 0)
+    $1_COMMAND_LINE := \
+        for i in {0..$$(JTREG_RETRY_COUNT)}; do \
+          if [ "$$$$i" != 0 ]; then \
+            $$(PRINTF) "\nRetrying Jtreg run. Attempt: $$$$i\n"; \
+          fi; \
+          $$($1_COMMAND_LINE); \
+          if [ "`$$(CAT) $$($1_EXITCODE)`" = "0" ]; then \
+            break; \
+          fi; \
+          export JTREG_STATUS="-status:error,fail"; \
+        done
+  endif
+
  run-test-$1: clean-workdir-$1 $$($1_AOT_TARGETS)
 	$$(call LogWarn)
 	$$(call LogWarn, Running test '$$($1_TEST)')
 	$$(call MakeDir, $$($1_TEST_RESULTS_DIR) $$($1_TEST_SUPPORT_DIR) \
 	    $$($1_TEST_TMP_DIR))
 	$$(call ExecuteWithLog, $$($1_TEST_SUPPORT_DIR)/jtreg, ( \
-	    $$(JAVA) $$($1_JTREG_LAUNCHER_OPTIONS) \
-	        -Dprogram=jtreg -jar $$(JT_HOME)/lib/jtreg.jar \
-	        $$($1_JTREG_BASIC_OPTIONS) \
-	        -testjdk:$$(JDK_IMAGE_DIR) \
-	        -dir:$$(JTREG_TOPDIR) \
-	        -reportDir:$$($1_TEST_RESULTS_DIR) \
-	        -workDir:$$($1_TEST_SUPPORT_DIR) \
-	        $$(JTREG_OPTIONS) \
-	        $$(JTREG_FAILURE_HANDLER_OPTIONS) \
-	        $$($1_TEST_NAME) \
-	    && $$(ECHO) $$$$? > $$($1_EXITCODE) \
-	    || $$(ECHO) $$$$? > $$($1_EXITCODE) \
+	    $$($1_COMMAND_LINE) \
 	))

  $1_RESULT_FILE := $$($1_TEST_RESULTS_DIR)/text/stats.txt
--- a/make/ToolsJdk.gmk
+++ b/make/ToolsJdk.gmk
@@ -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
@@ -73,9 +73,9 @@ TOOL_HASHER = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
 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 \
+TOOL_BLOCKED_CERTS = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
    --add-exports java.base/sun.security.util=ALL-UNNAMED \
-    build.tools.blacklistedcertsconverter.BlacklistedCertsConverter
+    build.tools.blockedcertsconverter.BlockedCertsConverter

 TOOL_MAKEJAVASECURITY = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
    build.tools.makejavasecurity.MakeJavaSecurity
--- a/make/autoconf/basics.m4
+++ b/make/autoconf/basics.m4
@@ -672,6 +672,16 @@ 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],
 [
--- a/make/autoconf/basics_windows.m4
+++ b/make/autoconf/basics_windows.m4
@@ -112,7 +112,6 @@ AC_DEFUN([BASIC_FIXUP_PATH_CYGWIN],
  # unix format.
  path="[$]$1"
  new_path=`$CYGPATH -u "$path"`
-
  # Cygwin tries to hide some aspects of the Windows file system, such that binaries are
  # named .exe but called without that suffix. Therefore, "foo" and "foo.exe" are considered
  # the same file, most of the time (as in "test -f"). But not when running cygpath -s, then
@@ -402,8 +401,19 @@ AC_DEFUN_ONCE([BASIC_COMPILE_FIXPATH],
    BASIC_WINDOWS_REWRITE_AS_WINDOWS_MIXED_PATH([FIXPATH_BIN_W])
    $RM -rf $FIXPATH_BIN $FIXPATH_DIR
    $MKDIR -p $FIXPATH_DIR $CONFIGURESUPPORT_OUTPUTDIR/bin
+    # simple cross compilation solution for fixpath for aarch64
+    # Final solution should be backport of 8257679
+    if test "x$COMPILE_TYPE-$OPENJDK_TARGET_CPU" = xcross-aarch64; then
+      FIXPATH_CC=`$ECHO "$CC"|$SED 's|/arm64/cl|/x64/cl|I'`
+      FIXPATH_LIB=`$ECHO "$LIB"|$SED 's|arm64|x64|gI'`
+    else
+      FIXPATH_CC=$CC
+      FIXPATH_LIB=$LIB
+    fi
+    OLDLIB=$LIB
+    export LIB="$FIXPATH_LIB"
    cd $FIXPATH_DIR
-    $CC $FIXPATH_SRC_W -Fe$FIXPATH_BIN_W > $FIXPATH_DIR/fixpath1.log 2>&1
+    $FIXPATH_CC $FIXPATH_SRC_W -Fe$FIXPATH_BIN_W > $FIXPATH_DIR/fixpath1.log 2>&1
    cd $CURDIR

    if test ! -x $FIXPATH_BIN; then
@@ -414,9 +424,10 @@ AC_DEFUN_ONCE([BASIC_COMPILE_FIXPATH],
    AC_MSG_RESULT([yes])
    AC_MSG_CHECKING([if fixpath.exe works])
    cd $FIXPATH_DIR
-    $FIXPATH $CC $FIXPATH_SRC -Fe$FIXPATH_DIR/fixpath2.exe \
+    $FIXPATH $FIXPATH_CC $FIXPATH_SRC -Fe$FIXPATH_DIR/fixpath2.exe \
        > $FIXPATH_DIR/fixpath2.log 2>&1
    cd $CURDIR
+    export LIB="$OLDLIB"
    if test ! -x $FIXPATH_DIR/fixpath2.exe; then
      AC_MSG_RESULT([no])
      cat $FIXPATH_DIR/fixpath2.log
--- a/make/autoconf/build-aux/config.guess
+++ b/make/autoconf/build-aux/config.guess
@@ -97,6 +97,15 @@ if [ "x$OUT" = x ]; then
  fi
 fi

+# Test and fix LoongArch64.
+if [ "x$OUT" = x ]; then
+  if [ `uname -s` = Linux ]; then
+    if [ `uname -m` = loongarch64 ]; then
+      OUT=loongarch64-unknown-linux-gnu
+    fi
+  fi
+fi
+
 # Test and fix cpu on Macosx when C preprocessor is not on the path
 echo $OUT | grep i386-apple-darwin > /dev/null 2> /dev/null
 if test $? = 0; then
--- a/make/autoconf/buildjdk-spec.gmk.in
+++ b/make/autoconf/buildjdk-spec.gmk.in
@@ -30,13 +30,13 @@
 # First include the real base spec.gmk file
 include @SPEC@

-CC := @BUILD_CC@
-CXX := @BUILD_CXX@
-LD := @BUILD_LD@
-LDCXX := @BUILD_LDCXX@
-AS := @BUILD_AS@
+CC := @FIXPATH@ @BUILD_CC@
+CXX := @FIXPATH@ @BUILD_CXX@
+LD := @FIXPATH@ @BUILD_LD@
+LDCXX := @FIXPATH@ @BUILD_LDCXX@
+AS := @FIXPATH@ @BUILD_AS@
 NM := @BUILD_NM@
-AR := @BUILD_AR@
+AR := @FIXPATH@ @BUILD_AR@
 OBJCOPY := @BUILD_OBJCOPY@
 STRIP := @BUILD_STRIP@
 SYSROOT_CFLAGS := @BUILD_SYSROOT_CFLAGS@
--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -391,16 +391,6 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS],
  CFLAGS="$CFLAGS_OLD"
  CXXFLAGS="$CXXFLAGS_OLD"

-  # Tests are only ever compiled for TARGET
-  CFLAGS_TESTLIB="$CFLAGS_JDKLIB"
-  CXXFLAGS_TESTLIB="$CXXFLAGS_JDKLIB"
-  CFLAGS_TESTEXE="$CFLAGS_JDKEXE"
-  CXXFLAGS_TESTEXE="$CXXFLAGS_JDKEXE"
-
-  AC_SUBST(CFLAGS_TESTLIB)
-  AC_SUBST(CFLAGS_TESTEXE)
-  AC_SUBST(CXXFLAGS_TESTLIB)
-  AC_SUBST(CXXFLAGS_TESTEXE)
 ])

 ################################################################################
@@ -705,7 +695,9 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
      $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -DcpuIntel -Di586 -D$FLAGS_CPU_LEGACY_LIB"
    fi
  elif 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
      $1_DEFINES_CPU_JDK="${$1_DEFINES_CPU_JDK} -D_X86_ -Dx86"
@@ -715,9 +707,21 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
  # CFLAGS PER CPU
  if test "x$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

--- a/make/autoconf/flags-ldflags.m4
+++ b/make/autoconf/flags-ldflags.m4
@@ -51,9 +51,7 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS],

  FLAGS_SETUP_LDFLAGS_CPU_DEP([BUILD], [OPENJDK_BUILD_])

-  LDFLAGS_TESTLIB="$LDFLAGS_JDKLIB"
-  LDFLAGS_TESTEXE="$LDFLAGS_JDKEXE ${TARGET_LDFLAGS_JDK_LIBPATH}"
-  AC_SUBST(LDFLAGS_TESTLIB)
+  LDFLAGS_TESTEXE="${TARGET_LDFLAGS_JDK_LIBPATH}"
  AC_SUBST(LDFLAGS_TESTEXE)
 ])

@@ -77,7 +75,7 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_HELPER],
    BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,-z,defs -Wl,-z,relro -Wl,-z,now"
    # s390x : remove unused code+data in link step
    if test "x$OPENJDK_TARGET_CPU" = xs390x; then
-      BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,--gc-sections -Wl,--print-gc-sections"
+      BASIC_LDFLAGS="$BASIC_LDFLAGS -Wl,--gc-sections"
    fi

    BASIC_LDFLAGS_JVM_ONLY="-Wl,-O1"
@@ -118,7 +116,7 @@ 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
  fi

@@ -187,12 +185,14 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_CPU_DEP],
      $1_CPU_LDFLAGS_JVM_ONLY="-xarch=sparc"
    fi

-  elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+ elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
    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"
      $1_CPU_EXECUTABLE_LDFLAGS="-stack:327680"
+    elif test "x${OPENJDK_$1_CPU}" = "xaarch64"; then
+      $1_CPU_EXECUTABLE_LDFLAGS="-stack:1048576"
    else
      $1_CPU_LDFLAGS_JVM_ONLY="-machine:AMD64"
      $1_CPU_EXECUTABLE_LDFLAGS="-stack:1048576"
@@ -201,7 +201,7 @@ AC_DEFUN([FLAGS_SETUP_LDFLAGS_CPU_DEP],

  # 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}"
@@ -209,13 +209,13 @@ 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"
  $2LDFLAGS_JDKEXE="$LDFLAGS_JDK_COMMON $EXECUTABLE_LDFLAGS \
      ${$1_CPU_EXECUTABLE_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}"

--- a/make/autoconf/flags-other.m4
+++ b/make/autoconf/flags-other.m4
@@ -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
@@ -107,6 +107,17 @@ AC_DEFUN([FLAGS_SETUP_ASFLAGS],
 [
  if test "x$OPENJDK_TARGET_OS" = xmacosx; then
    JVM_BASIC_ASFLAGS="-x assembler-with-cpp -mno-omit-leaf-frame-pointer -mstack-alignment=16"
+
+    # Fix linker warning.
+    # Code taken from make/autoconf/flags-cflags.m4 and adapted.
+    JVM_BASIC_ASFLAGS="$JVM_BASIC_ASFLAGS \
+        -DMAC_OS_X_VERSION_MIN_REQUIRED=$MACOSX_VERSION_MIN_NODOTS \
+        -mmacosx-version-min=$MACOSX_VERSION_MIN"
+
+    if test -n "$MACOSX_VERSION_MAX"; then
+        JVM_BASIC_ASFLAGS="$JVM_BASIC_ASFLAGS $OS_CFLAGS \
+            -DMAC_OS_X_VERSION_MAX_ALLOWED=$MACOSX_VERSION_MAX_NODOTS"
+    fi
  fi
 ])

--- a/make/autoconf/help.m4
+++ b/make/autoconf/help.m4
@@ -90,7 +90,7 @@ apt_help() {
    devkit)
      PKGHANDLER_COMMAND="sudo apt-get install build-essential" ;;
    openjdk)
-      PKGHANDLER_COMMAND="sudo apt-get install openjdk-8-jdk" ;;
+      PKGHANDLER_COMMAND="sudo apt-get install openjdk-11-jdk" ;;
    alsa)
      PKGHANDLER_COMMAND="sudo apt-get install libasound2-dev" ;;
    cups)
@@ -99,6 +99,8 @@ apt_help() {
      PKGHANDLER_COMMAND="sudo apt-get install libfontconfig1-dev" ;;
    freetype)
      PKGHANDLER_COMMAND="sudo apt-get install libfreetype6-dev" ;;
+    harfbuzz)
+      PKGHANDLER_COMMAND="sudo apt-get install libharfbuzz-dev" ;;
    ffi)
      PKGHANDLER_COMMAND="sudo apt-get install libffi-dev" ;;
    x11)
@@ -115,7 +117,7 @@ yum_help() {
    devkit)
      PKGHANDLER_COMMAND="sudo yum groupinstall \"Development Tools\"" ;;
    openjdk)
-      PKGHANDLER_COMMAND="sudo yum install java-1.8.0-openjdk-devel" ;;
+      PKGHANDLER_COMMAND="sudo yum install java-11-openjdk-devel" ;;
    alsa)
      PKGHANDLER_COMMAND="sudo yum install alsa-lib-devel" ;;
    cups)
@@ -124,6 +126,8 @@ yum_help() {
      PKGHANDLER_COMMAND="sudo yum install fontconfig-devel" ;;
    freetype)
      PKGHANDLER_COMMAND="sudo yum install freetype-devel" ;;
+    harfbuzz)
+      PKGHANDLER_COMMAND="sudo yum install harfbuzz-devel" ;;
    x11)
      PKGHANDLER_COMMAND="sudo yum install libXtst-devel libXt-devel libXrender-devel libXrandr-devel libXi-devel" ;;
    ccache)
--- a/make/autoconf/hotspot.m4
+++ b/make/autoconf/hotspot.m4
@@ -221,7 +221,7 @@ AC_DEFUN_ONCE([HOTSPOT_ENABLE_DISABLE_AOT],

  if test "x$ENABLE_AOT" = "xtrue"; then
    # Only enable AOT on X64 platforms.
-    if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
+    if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || test "x$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU" = "xlinux-aarch64" ; then
      if test -e "${TOPDIR}/src/jdk.aot"; then
        if test -e "${TOPDIR}/src/jdk.internal.vm.compiler"; then
          ENABLE_AOT="true"
@@ -240,7 +240,7 @@ AC_DEFUN_ONCE([HOTSPOT_ENABLE_DISABLE_AOT],
    else
      ENABLE_AOT="false"
      if test "x$enable_aot" = "xyes"; then
-        AC_MSG_ERROR([AOT is currently only supported on x86_64 and aarch64. Remove --enable-aot.])
+        AC_MSG_ERROR([AOT is currently only supported on x86_64 and linux-aarch64. Remove --enable-aot.])
      fi
    fi
  fi
@@ -363,7 +363,12 @@ AC_DEFUN_ONCE([HOTSPOT_SETUP_JVM_FEATURES],
  # Only enable Shenandoah on supported arches, and only if requested
  AC_MSG_CHECKING([if shenandoah can be built])
  if HOTSPOT_CHECK_JVM_FEATURE(shenandoahgc); then
-    if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86" || test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
+    if test "x$OPENJDK_TARGET_CPU_ARCH" = "xx86" || \
+       test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
+      # Filter out Shenandoah from user requested features, as it's already in non-minimal set
+      if HOTSPOT_CHECK_JVM_VARIANT(minimal); then
+        BASIC_GET_NON_MATCHING_VALUES(JVM_FEATURES, $JVM_FEATURES, shenandoahgc)
+      fi
      AC_MSG_RESULT([yes])
    else
      DISABLED_JVM_FEATURES="$DISABLED_JVM_FEATURES shenandoahgc"
@@ -371,6 +376,7 @@ AC_DEFUN_ONCE([HOTSPOT_SETUP_JVM_FEATURES],
    fi
  else
      DISABLED_JVM_FEATURES="$DISABLED_JVM_FEATURES shenandoahgc"
+      AC_MSG_RESULT([no, not enabled by default])
  fi

  # Only enable ZGC on supported platforms
@@ -420,7 +426,9 @@ AC_DEFUN_ONCE([HOTSPOT_SETUP_JVM_FEATURES],
    # Only enable jvmci on x86_64, sparcv9 and aarch64
    if test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
       test "x$OPENJDK_TARGET_CPU" = "xsparcv9" || \
-       test "x$OPENJDK_TARGET_CPU" = "xaarch64" ; then
+       test "x$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU" = "xwindows-aarch64" || \
+       test "x$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU" = "xlinux-aarch64"   || \
+       test "x$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU" = "xmacosx-aarch64" ; then
      AC_MSG_RESULT([yes])
      JVM_FEATURES_jvmci="jvmci"
      INCLUDE_JVMCI="true"
@@ -451,10 +459,11 @@ AC_DEFUN_ONCE([HOTSPOT_SETUP_JVM_FEATURES],
      JVM_FEATURES_graal="graal"
      INCLUDE_GRAAL="true"
    else
-      # By default enable graal build on x64 or where AOT is available.
+      # By default enable graal build on x64/aarch64 or where AOT is available.
      # graal build requires jvmci.
      if test "x$JVM_FEATURES_jvmci" = "xjvmci" && \
          (test "x$OPENJDK_TARGET_CPU" = "xx86_64" || \
+           test "x$OPENJDK_TARGET_CPU" = "xaarch64" || \
           test "x$ENABLE_AOT" = "xtrue") ; then
        AC_MSG_RESULT([yes])
        JVM_FEATURES_graal="graal"
--- a/make/autoconf/jdk-options.m4
+++ b/make/autoconf/jdk-options.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -291,11 +291,7 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_DEBUG_SYMBOLS],
      [AS_HELP_STRING([--with-native-debug-symbols],
      [set the native debug symbol configuration (none, internal, external, zipped) @<:@varying@:>@])],
      [
-        if test "x$OPENJDK_TARGET_OS" = xaix; then
-          if test "x$withval" = xexternal || test "x$withval" = xzipped; then
-            AC_MSG_ERROR([AIX only supports the parameters 'none' and 'internal' for --with-native-debug-symbols])
-          fi
-        elif test "x$OPENJDK_TARGET_OS" = xwindows; then
+        if test "x$OPENJDK_TARGET_OS" = xwindows; then
          if test "x$withval" = xinternal; then
            AC_MSG_ERROR([Windows does not support the parameter 'internal' for --with-native-debug-symbols])
          fi
@@ -305,12 +301,7 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_DEBUG_SYMBOLS],
        if test "x$STATIC_BUILD" = xtrue; then
          with_native_debug_symbols="none"
        else
-          if test "x$OPENJDK_TARGET_OS" = xaix; then
-            # AIX doesn't support 'external' so use 'internal' as default
-            with_native_debug_symbols="internal"
-          else
-            with_native_debug_symbols="external"
-          fi
+          with_native_debug_symbols="external"
        fi
      ])
  AC_MSG_RESULT([$with_native_debug_symbols])
--- a/make/autoconf/lib-bundled.m4
+++ b/make/autoconf/lib-bundled.m4
@@ -37,6 +37,7 @@ AC_DEFUN_ONCE([LIB_SETUP_BUNDLED_LIBS],
  LIB_SETUP_LIBPNG
  LIB_SETUP_ZLIB
  LIB_SETUP_LCMS
+  LIB_SETUP_HARFBUZZ
 ])

 ################################################################################
@@ -260,3 +261,43 @@ AC_DEFUN_ONCE([LIB_SETUP_LCMS],
  AC_SUBST(LCMS_CFLAGS)
  AC_SUBST(LCMS_LIBS)
 ])
+
+################################################################################
+# Setup harfbuzz
+################################################################################
+AC_DEFUN_ONCE([LIB_SETUP_HARFBUZZ],
+[
+  AC_ARG_WITH(harfbuzz, [AS_HELP_STRING([--with-harfbuzz],
+      [use harfbuzz from build system or OpenJDK source (system, bundled) @<:@bundled@:>@])])
+
+  AC_MSG_CHECKING([for which harfbuzz to use])
+
+  DEFAULT_HARFBUZZ=bundled
+  # If user didn't specify, use DEFAULT_HARFBUZZ
+  if test "x${with_harfbuzz}" = "x"; then
+    with_harfbuzz=${DEFAULT_HARFBUZZ}
+  fi
+
+  if test "x${with_harfbuzz}" = "xbundled"; then
+    USE_EXTERNAL_HARFBUZZ=false
+    HARFBUZZ_CFLAGS=""
+    HARFBUZZ_LIBS=""
+    AC_MSG_RESULT([bundled])
+  elif test "x${with_harfbuzz}" = "xsystem"; then
+    AC_MSG_RESULT([system])
+    PKG_CHECK_MODULES([HARFBUZZ], [harfbuzz], [HARFBUZZ_FOUND=yes], [HARFBUZZ_FOUND=no])
+    if test "x${HARFBUZZ_FOUND}" = "xyes"; then
+      # PKG_CHECK_MODULES will set HARFBUZZ_CFLAGS and HARFBUZZ_LIBS
+      USE_EXTERNAL_HARFBUZZ=true
+    else
+      HELP_MSG_MISSING_DEPENDENCY([harfbuzz])
+      AC_MSG_ERROR([--with-harfbuzz=system specified, but no harfbuzz found! $HELP_MSG])
+    fi
+  else
+    AC_MSG_ERROR([Invalid value for --with-harfbuzz: ${with_harfbuzz}, use 'system' or 'bundled'])
+  fi
+
+  AC_SUBST(USE_EXTERNAL_HARFBUZZ)
+  AC_SUBST(HARFBUZZ_CFLAGS)
+  AC_SUBST(HARFBUZZ_LIBS)
+])
--- a/make/autoconf/lib-freetype.m4
+++ b/make/autoconf/lib-freetype.m4
@@ -173,6 +173,16 @@ AC_DEFUN_ONCE([LIB_SETUP_FREETYPE],
        FREETYPE_BASE_DIR="$SYSROOT/usr"
        LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include], [$FREETYPE_BASE_DIR/lib], [well-known location])

+        if test "x$FOUND_FREETYPE" != "xyes" ; then
+          LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include],
+              [$FREETYPE_BASE_DIR/lib/$OPENJDK_TARGET_CPU-$OPENJDK_TARGET_OS-$OPENJDK_TARGET_ABI], [well-known location])
+        fi
+
+        if test "x$FOUND_FREETYPE" != "xyes" ; then
+          LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include],
+              [$FREETYPE_BASE_DIR/lib/$OPENJDK_TARGET_CPU_AUTOCONF-$OPENJDK_TARGET_OS-$OPENJDK_TARGET_ABI], [well-known location])
+        fi
+
        if (test "x$FOUND_FREETYPE" != "xyes"); then
          FREETYPE_BASE_DIR="$SYSROOT/usr/X11"
          LIB_CHECK_POTENTIAL_FREETYPE([$FREETYPE_BASE_DIR/include], [$FREETYPE_BASE_DIR/lib], [well-known location])
--- a/make/autoconf/lib-x11.m4
+++ b/make/autoconf/lib-x11.m4
@@ -68,6 +68,10 @@ AC_DEFUN_ONCE([LIB_SETUP_X11],
            x_libraries="$SYSROOT/usr/lib64"
          elif test -f "$SYSROOT/usr/lib/libX11.so"; then
            x_libraries="$SYSROOT/usr/lib"
+          elif test -f "$SYSROOT/usr/lib/$OPENJDK_TARGET_CPU-$OPENJDK_TARGET_OS-$OPENJDK_TARGET_ABI/libX11.so"; then
+            x_libraries="$SYSROOT/usr/lib/$OPENJDK_TARGET_CPU-$OPENJDK_TARGET_OS-$OPENJDK_TARGET_ABI/libX11.so"
+          elif test -f "$SYSROOT/usr/lib/$OPENJDK_TARGET_CPU_AUTOCONF-$OPENJDK_TARGET_OS-$OPENJDK_TARGET_ABI/libX11.so"; then
+            x_libraries="$SYSROOT/usr/lib/$OPENJDK_TARGET_CPU_AUTOCONF-$OPENJDK_TARGET_OS-$OPENJDK_TARGET_ABI/libX11.so"
          fi
        fi
      fi
--- a/make/autoconf/platform.m4
+++ b/make/autoconf/platform.m4
@@ -79,6 +79,12 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_CPU],
      VAR_CPU_BITS=64
      VAR_CPU_ENDIAN=little
      ;;
+    loongarch64)
+      VAR_CPU=loongarch64
+      VAR_CPU_ARCH=loongarch
+      VAR_CPU_BITS=64
+      VAR_CPU_ENDIAN=little
+      ;;
    m68k)
      VAR_CPU=m68k
      VAR_CPU_ARCH=m68k
@@ -127,6 +133,12 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_CPU],
      VAR_CPU_BITS=64
      VAR_CPU_ENDIAN=little
      ;;
+    riscv64)
+      VAR_CPU=riscv64
+      VAR_CPU_ARCH=riscv
+      VAR_CPU_BITS=64
+      VAR_CPU_ENDIAN=little
+      ;;
    s390)
      VAR_CPU=s390
      VAR_CPU_ARCH=s390
@@ -209,6 +221,33 @@ 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_ABI.
+AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_ABI],
+[
+  case "$1" in
+    *linux*-musl)
+      VAR_ABI=musl
+      ;;
+    *linux*-gnu)
+      VAR_ABI=gnu
+      ;;
+    *linux*-gnueabi)
+      VAR_ABI=gnueabi
+      ;;
+    *linux*-gnueabihf)
+      VAR_ABI=gnueabihf
+      ;;
+    *linux*-gnuabi64)
+      VAR_ABI=gnuabi64
+      ;;
+    *)
+      VAR_ABI=default
+      ;;
+  esac
+])
+
 # Expects $host_os $host_cpu $build_os and $build_cpu
 # and $with_target_bits to have been setup!
 #
@@ -229,6 +268,7 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU variables.
  PLATFORM_EXTRACT_VARS_FROM_OS($build_os)
  PLATFORM_EXTRACT_VARS_FROM_CPU($build_cpu, $build_os)
+  PLATFORM_EXTRACT_VARS_FROM_ABI($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
@@ -245,6 +285,8 @@ 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="$VAR_CPU_ENDIAN"
+  OPENJDK_BUILD_CPU_AUTOCONF="$build_cpu"
+  OPENJDK_BUILD_ABI="$VAR_ABI"
  AC_SUBST(OPENJDK_BUILD_OS)
  AC_SUBST(OPENJDK_BUILD_OS_TYPE)
  AC_SUBST(OPENJDK_BUILD_OS_ENV)
@@ -252,6 +294,8 @@ 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_CPU_AUTOCONF)
+  AC_SUBST(OPENJDK_BUILD_ABI)

  AC_MSG_CHECKING([openjdk-build os-cpu])
  AC_MSG_RESULT([$OPENJDK_BUILD_OS-$OPENJDK_BUILD_CPU])
@@ -259,6 +303,7 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  # Convert the autoconf OS/CPU value to our own data, into the VAR_OS/CPU variables.
  PLATFORM_EXTRACT_VARS_FROM_OS($host_os)
  PLATFORM_EXTRACT_VARS_FROM_CPU($host_cpu, $host_os)
+  PLATFORM_EXTRACT_VARS_FROM_ABI($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
@@ -275,7 +320,9 @@ AC_DEFUN([PLATFORM_EXTRACT_TARGET_AND_BUILD],
  OPENJDK_TARGET_CPU_ARCH="$VAR_CPU_ARCH"
  OPENJDK_TARGET_CPU_BITS="$VAR_CPU_BITS"
  OPENJDK_TARGET_CPU_ENDIAN="$VAR_CPU_ENDIAN"
+  OPENJDK_TARGET_CPU_AUTOCONF="$host_cpu"
  OPENJDK_TARGET_OS_UPPERCASE=`$ECHO $OPENJDK_TARGET_OS | $TR 'abcdefghijklmnopqrstuvwxyz' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'`
+  OPENJDK_TARGET_ABI="$VAR_ABI"

  AC_SUBST(OPENJDK_TARGET_OS)
  AC_SUBST(OPENJDK_TARGET_OS_TYPE)
@@ -285,6 +332,8 @@ 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_CPU_AUTOCONF)
+  AC_SUBST(OPENJDK_TARGET_ABI)

  AC_MSG_CHECKING([openjdk-target os-cpu])
  AC_MSG_RESULT([$OPENJDK_TARGET_OS-$OPENJDK_TARGET_CPU])
@@ -486,6 +535,8 @@ AC_DEFUN([PLATFORM_SETUP_LEGACY_VARS_HELPER],
    HOTSPOT_$1_CPU_DEFINE=S390
  elif test "x$OPENJDK_$1_CPU" = xs390x; then
    HOTSPOT_$1_CPU_DEFINE=S390
+  elif test "x$OPENJDK_$1_CPU" = xriscv64; then
+    HOTSPOT_$1_CPU_DEFINE=RISCV
  elif test "x$OPENJDK_$1_CPU" != x; then
    HOTSPOT_$1_CPU_DEFINE=$(echo $OPENJDK_$1_CPU | tr a-z A-Z)
  fi
--- a/make/autoconf/spec.gmk.in
+++ b/make/autoconf/spec.gmk.in
@@ -382,7 +382,7 @@ GCOV_ENABLED=@GCOV_ENABLED@
 export ASAN_ENABLED:=@ASAN_ENABLED@
 export DEVKIT_LIB_DIR:=@DEVKIT_LIB_DIR@
 ifeq ($(ASAN_ENABLED), yes)
-  export ASAN_OPTIONS="handle_segv=0 detect_leaks=0"
+  export ASAN_OPTIONS=handle_segv=0 detect_leaks=0
  ifneq ($(DEVKIT_LIB_DIR),)
    export LD_LIBRARY_PATH:=$(LD_LIBRARY_PATH):$(DEVKIT_LIB_DIR)
  endif
@@ -508,11 +508,6 @@ LDCXX:=@FIXPATH@ @LDCXX@
 LIBCXX:=@LIBCXX@

 # Compiler and linker flags used when building native tests
-CFLAGS_TESTLIB:=@CFLAGS_TESTLIB@
-CXXFLAGS_TESTLIB:=@CXXFLAGS_TESTLIB@
-CFLAGS_TESTEXE:=@CFLAGS_TESTEXE@
-CXXFLAGS_TESTEXE:=@CXXFLAGS_TESTEXE@
-LDFLAGS_TESTLIB:=@LDFLAGS_TESTLIB@
 LDFLAGS_TESTEXE:=@LDFLAGS_TESTEXE@

 # BUILD_CC/BUILD_LD is a compiler/linker that generates code that is runnable on the
@@ -617,7 +612,7 @@ JAVA_JAVAC=@FIXPATH@ $(JAVA_CMD) $(JAVA_FLAGS_JAVAC) $(JAVA_FLAGS)
 JAVAC=@FIXPATH@ $(JAVAC_CMD)
 JAVADOC=@FIXPATH@ $(JAVADOC_CMD)
 JAR=@FIXPATH@ $(JAR_CMD)
-JLINK = @FIXPATH@ $(JLINK_CMD) $(JAVA_TOOL_FLAGS_SMALL)
+JLINK = @FIXPATH@ $(JLINK_CMD)
 JMOD = @FIXPATH@ $(JMOD_CMD) $(JAVA_TOOL_FLAGS_SMALL)
 JARSIGNER=@FIXPATH@ $(JARSIGNER_CMD)
 # A specific java binary with specific options can be used to run
@@ -832,6 +827,10 @@ USE_EXTERNAL_LCMS:=@USE_EXTERNAL_LCMS@
 LCMS_CFLAGS:=@LCMS_CFLAGS@
 LCMS_LIBS:=@LCMS_LIBS@

+USE_EXTERNAL_HARFBUZZ:=@USE_EXTERNAL_HARFBUZZ@
+HARFBUZZ_CFLAGS:=@HARFBUZZ_CFLAGS@
+HARFBUZZ_LIBS:=@HARFBUZZ_LIBS@
+
 USE_EXTERNAL_LIBPNG:=@USE_EXTERNAL_LIBPNG@
 PNG_LIBS:=@PNG_LIBS@
 PNG_CFLAGS:=@PNG_CFLAGS@
--- a/make/autoconf/toolchain.m4
+++ b/make/autoconf/toolchain.m4
@@ -918,14 +918,18 @@ AC_DEFUN_ONCE([TOOLCHAIN_SETUP_BUILD_COMPILERS],
          . $CONFIGURESUPPORT_OUTPUTDIR/build-devkit.info
          # This potentially sets the following:
          # A descriptive name of the devkit
-          BASIC_EVAL_DEVKIT_VARIABLE([BUILD_DEVKIT_NAME])
+          BASIC_EVAL_BUILD_DEVKIT_VARIABLE([BUILD_DEVKIT_NAME])
          # Corresponds to --with-extra-path
-          BASIC_EVAL_DEVKIT_VARIABLE([BUILD_DEVKIT_EXTRA_PATH])
+          BASIC_EVAL_BUILD_DEVKIT_VARIABLE([BUILD_DEVKIT_EXTRA_PATH])
          # Corresponds to --with-toolchain-path
-          BASIC_EVAL_DEVKIT_VARIABLE([BUILD_DEVKIT_TOOLCHAIN_PATH])
+          BASIC_EVAL_BUILD_DEVKIT_VARIABLE([BUILD_DEVKIT_TOOLCHAIN_PATH])
          # Corresponds to --with-sysroot
-          BASIC_EVAL_DEVKIT_VARIABLE([BUILD_DEVKIT_SYSROOT])
-          # Skip the Window specific parts
+          BASIC_EVAL_BUILD_DEVKIT_VARIABLE([BUILD_DEVKIT_SYSROOT])
+
+          if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+            BASIC_EVAL_BUILD_DEVKIT_VARIABLE([BUILD_DEVKIT_VS_INCLUDE])
+            BASIC_EVAL_BUILD_DEVKIT_VARIABLE([BUILD_DEVKIT_VS_LIB])
+          fi
        fi

        AC_MSG_CHECKING([for build platform devkit])
@@ -935,13 +939,37 @@ AC_DEFUN_ONCE([TOOLCHAIN_SETUP_BUILD_COMPILERS],
          AC_MSG_RESULT([$BUILD_DEVKIT_ROOT])
        fi

-        BUILD_SYSROOT="$BUILD_DEVKIT_SYSROOT"
+        PATH="$BUILD_DEVKIT_EXTRA_PATH:$PATH"

-         # Fallback default of just /bin if DEVKIT_PATH is not defined
+        # Fallback default of just /bin if DEVKIT_PATH is not defined
        if test "x$BUILD_DEVKIT_TOOLCHAIN_PATH" = x; then
          BUILD_DEVKIT_TOOLCHAIN_PATH="$BUILD_DEVKIT_ROOT/bin"
        fi
-        PATH="$BUILD_DEVKIT_TOOLCHAIN_PATH:$BUILD_DEVKIT_EXTRA_PATH"
+        PATH="$BUILD_DEVKIT_TOOLCHAIN_PATH:$PATH"
+
+        BUILD_SYSROOT="$BUILD_DEVKIT_SYSROOT"
+
+        if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+          BUILD_VS_INCLUDE="$BUILD_DEVKIT_VS_INCLUDE"
+          BUILD_VS_LIB="$BUILD_DEVKIT_VS_LIB"
+
+          TOOLCHAIN_SETUP_VISUAL_STUDIO_SYSROOT_FLAGS([BUILD_])
+        fi
+      fi
+    else
+      if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+        if test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
+          # try to guess compiler layout. Final solution should be
+          # backport of 8257679. Try primitive approach for now 
+          BUILD_CC=`$ECHO "$CC"|$SED 's|/arm64/cl|/x64/cl|I'`
+          BUILD_CXX=`$ECHO "$CXX"|$SED 's|/arm64/cl|/x64/cl|I'`
+          BUILD_AR=`$ECHO "$AR"|$SED 's|/arm64/lib|/x64/lib|I'`
+          BUILD_LD=`$ECHO "$LD"|$SED 's|/arm64/link|/x64/link|I'`
+          BUILD_SYSROOT_CFLAGS=`$ECHO "$SYSROOT_CFLAGS"|$SED 's|/arm64|/x64|gI'`
+          BUILD_SYSROOT_LDFLAGS=`$ECHO "$SYSROOT_LDFLAGS"|$SED 's|/arm64|/x64|gI'`
+        else
+          AC_MSG_ERROR([only windows-aarch64 cross compilation is supported so far])
+        fi
      fi
    fi

@@ -967,9 +995,37 @@ AC_DEFUN_ONCE([TOOLCHAIN_SETUP_BUILD_COMPILERS],
    BASIC_FIXUP_EXECUTABLE(BUILD_STRIP)
    # Assume the C compiler is the assembler
    BUILD_AS="$BUILD_CC -c"
-    # Just like for the target compiler, use the compiler as linker
-    BUILD_LD="$BUILD_CC"
-    BUILD_LDCXX="$BUILD_CXX"
+    if test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
+      # In the Microsoft toolchain we have a separate LD command "link".
+      # Make sure we reject /usr/bin/link (as determined in CYGWIN_LINK), which is
+      # a cygwin program for something completely different.
+      AC_CHECK_PROG([BUILD_LD], [link$EXE_SUFFIX],[link$EXE_SUFFIX],,, [$CYGWIN_LINK])
+      BASIC_FIXUP_EXECUTABLE(BUILD_LD)
+      # Verify that we indeed succeeded with this trick.
+      AC_MSG_CHECKING([if the found link.exe is actually the Visual Studio linker])
+
+      # Reset PATH since it can contain a mix of WSL/linux paths and Windows paths from VS,
+      # which, in combination with WSLENV, will make the WSL layer complain
+      old_path="$PATH"
+      PATH=
+
+      "$BUILD_LD" --version > /dev/null
+
+      if test $? -eq 0 ; then
+        AC_MSG_RESULT([no])
+        AC_MSG_ERROR([This is the Cygwin link tool. Please check your PATH and rerun configure.])
+      else
+        AC_MSG_RESULT([yes])
+      fi
+
+      PATH="$old_path"
+
+      BUILD_LDCXX="$BUILD_LD"
+    else
+      # Just like for the target compiler, use the compiler as linker
+      BUILD_LD="$BUILD_CC"
+      BUILD_LDCXX="$BUILD_CXX"
+    fi

    PATH="$OLDPATH"

@@ -1025,6 +1081,10 @@ AC_DEFUN_ONCE([TOOLCHAIN_MISC_CHECKS],
      if test "x$COMPILER_CPU_TEST" != "xx64"; then
        AC_MSG_ERROR([Target CPU mismatch. We are building for $OPENJDK_TARGET_CPU but CL is for "$COMPILER_CPU_TEST"; expected "x64".])
      fi
+    elif test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
+      if test "x$COMPILER_CPU_TEST" != "xARM64"; then
+        AC_MSG_ERROR([Target CPU mismatch. We are building for $OPENJDK_TARGET_CPU but CL is for "$COMPILER_CPU_TEST"; expected "arm64".])
+      fi
    fi
  fi

--- a/make/autoconf/toolchain_windows.m4
+++ b/make/autoconf/toolchain_windows.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2019, 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
@@ -25,7 +25,7 @@

 ################################################################################
 # The order of these defines the priority by which we try to find them.
-VALID_VS_VERSIONS="2017 2013 2015 2012 2010"
+VALID_VS_VERSIONS="2019 2017 2013 2015 2012 2010"

 VS_DESCRIPTION_2010="Microsoft Visual Studio 2010"
 VS_VERSION_INTERNAL_2010=100
@@ -80,13 +80,27 @@ VS_VERSION_INTERNAL_2017=141
 VS_MSVCR_2017=vcruntime140.dll
 VS_MSVCP_2017=msvcp140.dll
 VS_ENVVAR_2017="VS150COMNTOOLS"
-VS_USE_UCRT_2017="true"
+VS_USE_UCRT_2017="false"
 VS_VS_INSTALLDIR_2017="Microsoft Visual Studio/2017"
 VS_EDITIONS_2017="BuildTools Community Professional Enterprise"
 VS_SDK_INSTALLDIR_2017=
 VS_VS_PLATFORM_NAME_2017="v141"
 VS_SDK_PLATFORM_NAME_2017=
 VS_SUPPORTED_2017=true
+VS_TOOLSET_SUPPORTED_2017=true
+
+VS_DESCRIPTION_2019="Microsoft Visual Studio 2019"
+VS_VERSION_INTERNAL_2019=142
+VS_MSVCR_2019=vcruntime140.dll
+VS_MSVCP_2019=msvcp140.dll
+VS_ENVVAR_2019="VS160COMNTOOLS"
+VS_USE_UCRT_2019="false"
+VS_VS_INSTALLDIR_2019="Microsoft Visual Studio/2019"
+VS_EDITIONS_2019="BuildTools Community Professional Enterprise"
+VS_SDK_INSTALLDIR_2019=
+VS_VS_PLATFORM_NAME_2019="v142"
+VS_SDK_PLATFORM_NAME_2019=
+VS_SUPPORTED_2019=true

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

@@ -98,7 +112,7 @@ AC_DEFUN([TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT],
    METHOD="$3"

    BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(VS_BASE)
-    # In VS 2017, the default installation is in a subdir named after the edition.
+    # In VS 2017 and VS 2019, the default installation is in a subdir named after the edition.
    # Find the first one present and use that.
    if test "x$VS_EDITIONS" != x; then
      for edition in $VS_EDITIONS; do
@@ -111,11 +125,15 @@ AC_DEFUN([TOOLCHAIN_CHECK_POSSIBLE_VISUAL_STUDIO_ROOT],

    if test -d "$VS_BASE"; then
      AC_MSG_NOTICE([Found Visual Studio installation at $VS_BASE using $METHOD])
-      if test "x$OPENJDK_TARGET_CPU_BITS" = x32; then
+      if test "x$OPENJDK_TARGET_CPU" = xx86; then
        VCVARSFILES="vc/bin/vcvars32.bat vc/auxiliary/build/vcvars32.bat"
-      else
+      elif test "x$OPENJDK_TARGET_CPU" = xx86_64; then
        VCVARSFILES="vc/bin/amd64/vcvars64.bat vc/bin/x86_amd64/vcvarsx86_amd64.bat \
            vc/auxiliary/build/vcvarsx86_amd64.bat vc/auxiliary/build/vcvars64.bat"
+      elif test "x$OPENJDK_TARGET_CPU" = xaarch64; then
+        # for host x86-64, target aarch64
+        VCVARSFILES="vc/auxiliary/build/vcvarsamd64_arm64.bat \
+            vc/auxiliary/build/vcvarsx86_arm64.bat"
      fi

      for VCVARSFILE in $VCVARSFILES; do
@@ -155,10 +173,12 @@ AC_DEFUN([TOOLCHAIN_CHECK_POSSIBLE_WIN_SDK_ROOT],
      elif test -f "$WIN_SDK_BASE/Bin/SetEnv.Cmd"; then
        AC_MSG_NOTICE([Found Windows SDK installation at $WIN_SDK_BASE using $METHOD])
        VS_ENV_CMD="$WIN_SDK_BASE/Bin/SetEnv.Cmd"
-        if test "x$OPENJDK_TARGET_CPU_BITS" = x32; then
+        if test "x$OPENJDK_TARGET_CPU" = xx86; then
          VS_ENV_ARGS="/x86"
-        else
+        elif test "x$OPENJDK_TARGET_CPU" = xx86_64; then
          VS_ENV_ARGS="/x64"
+        elif test "x$OPENJDK_TARGET_CPU" = xaarch64; then
+          VS_ENV_ARGS="/arm64"
        fi
        # PLATFORM_TOOLSET is used during the compilation of the freetype sources (see
        # 'LIB_BUILD_FREETYPE' in libraries.m4) and must be 'Windows7.1SDK' for Windows7.1SDK
@@ -177,6 +197,15 @@ AC_DEFUN([TOOLCHAIN_CHECK_POSSIBLE_WIN_SDK_ROOT],
 # build environment and assigns it to VS_ENV_CMD
 AC_DEFUN([TOOLCHAIN_FIND_VISUAL_STUDIO_BAT_FILE],
 [
+  # VS2017 provides the option to install previous minor versions of the MSVC
+  # toolsets. It is not possible to directly download earlier minor versions of
+  # VS2017 and in order to build with a previous minor compiler toolset version,
+  # it is now possible to compile with earlier minor versions by passing
+  # -vcvars_ver=<toolset_version> argument to vcvarsall.bat.
+  AC_ARG_WITH(msvc-toolset-version, [AS_HELP_STRING([--with-msvc-toolset-version],
+      [specific MSVC toolset version to use, passed as -vcvars_ver argument to
+       pass to vcvarsall.bat (Windows only)])])
+
  VS_VERSION="$1"
  eval VS_COMNTOOLS_VAR="\${VS_ENVVAR_${VS_VERSION}}"
  eval VS_COMNTOOLS="\$${VS_COMNTOOLS_VAR}"
@@ -184,6 +213,7 @@ AC_DEFUN([TOOLCHAIN_FIND_VISUAL_STUDIO_BAT_FILE],
  eval VS_EDITIONS="\${VS_EDITIONS_${VS_VERSION}}"
  eval SDK_INSTALL_DIR="\${VS_SDK_INSTALLDIR_${VS_VERSION}}"
  eval VS_ENV_ARGS="\${VS_ENV_ARGS_${VS_VERSION}}"
+  eval VS_TOOLSET_SUPPORTED="\${VS_TOOLSET_SUPPORTED_${VS_VERSION}}"

  VS_ENV_CMD=""

@@ -241,6 +271,12 @@ AC_DEFUN([TOOLCHAIN_FIND_VISUAL_STUDIO_BAT_FILE],
    TOOLCHAIN_CHECK_POSSIBLE_WIN_SDK_ROOT([${VS_VERSION}],
        [C:/Program Files (x86)/$SDK_INSTALL_DIR], [well-known name])
  fi
+
+  if test "x$VS_TOOLSET_SUPPORTED" != x; then
+    if test "x$with_msvc_toolset_version" != x; then
+      VS_ENV_ARGS="$VS_ENV_ARGS -vcvars_ver=$with_msvc_toolset_version"
+    fi
+  fi
 ])

 ################################################################################
@@ -397,6 +433,8 @@ AC_DEFUN([TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV],
          >> $EXTRACT_VC_ENV_BAT_FILE
      $ECHO "$WINPATH_BASH -c 'echo VCINSTALLDIR="'\"$VCINSTALLDIR \" >> set-vs-env.sh' \
          >> $EXTRACT_VC_ENV_BAT_FILE
+      $ECHO "$WINPATH_BASH -c 'echo VCToolsRedistDir="'\"$VCToolsRedistDir \" >> set-vs-env.sh' \
+          >> $EXTRACT_VC_ENV_BAT_FILE
      $ECHO "$WINPATH_BASH -c 'echo WindowsSdkDir="'\"$WindowsSdkDir \" >> set-vs-env.sh' \
          >> $EXTRACT_VC_ENV_BAT_FILE
      $ECHO "$WINPATH_BASH -c 'echo WINDOWSSDKDIR="'\"$WINDOWSSDKDIR \" >> set-vs-env.sh' \
@@ -442,6 +480,7 @@ AC_DEFUN([TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV],
      VS_INCLUDE=`$ECHO "$VS_INCLUDE" | $SED -e 's/\\\\*;* *$//'`
      VS_LIB=`$ECHO "$VS_LIB" | $SED 's/\\\\*;* *$//'`
      VCINSTALLDIR=`$ECHO "$VCINSTALLDIR" | $SED 's/\\\\* *$//'`
+      VCToolsRedistDir=`$ECHO "$VCToolsRedistDir" | $SED 's/\\\\* *$//'`
      WindowsSdkDir=`$ECHO "$WindowsSdkDir" | $SED 's/\\\\* *$//'`
      WINDOWSSDKDIR=`$ECHO "$WINDOWSSDKDIR" | $SED 's/\\\\* *$//'`
      if test -z "$WINDOWSSDKDIR"; then
@@ -455,41 +494,7 @@ AC_DEFUN([TOOLCHAIN_SETUP_VISUAL_STUDIO_ENV],
      AC_SUBST(VS_INCLUDE)
      AC_SUBST(VS_LIB)

-      # Convert VS_INCLUDE into SYSROOT_CFLAGS
-      OLDIFS="$IFS"
-      IFS=";"
-      for i in $VS_INCLUDE; do
-        ipath=$i
-        # Only process non-empty elements
-        if test "x$ipath" != x; then
-          IFS="$OLDIFS"
-          # Check that directory exists before calling fixup_path
-          testpath=$ipath
-          BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([testpath])
-          if test -d "$testpath"; then
-            BASIC_FIXUP_PATH([ipath])
-            SYSROOT_CFLAGS="$SYSROOT_CFLAGS -I$ipath"
-          fi
-          IFS=";"
-        fi
-      done
-      # Convert VS_LIB into SYSROOT_LDFLAGS
-      for i in $VS_LIB; do
-        libpath=$i
-        # Only process non-empty elements
-        if test "x$libpath" != x; then
-          IFS="$OLDIFS"
-          # Check that directory exists before calling fixup_path
-          testpath=$libpath
-          BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([testpath])
-          if test -d "$testpath"; then
-            BASIC_FIXUP_PATH([libpath])
-            SYSROOT_LDFLAGS="$SYSROOT_LDFLAGS -libpath:$libpath"
-          fi
-          IFS=";"
-        fi
-      done
-      IFS="$OLDIFS"
+      TOOLCHAIN_SETUP_VISUAL_STUDIO_SYSROOT_FLAGS
    fi
  else
    AC_MSG_RESULT([not found])
@@ -526,10 +531,15 @@ AC_DEFUN([TOOLCHAIN_CHECK_POSSIBLE_MSVC_DLL],
        CORRECT_MSVCR_ARCH="PE32+ executable"
      fi
    else
-      if test "x$OPENJDK_TARGET_CPU_BITS" = x32; then
+      if test "x$OPENJDK_TARGET_CPU" = xx86; then
        CORRECT_MSVCR_ARCH=386
-      else
+      elif test "x$OPENJDK_TARGET_CPU" = xx86_64; then
        CORRECT_MSVCR_ARCH=x86-64
+      elif test "x$OPENJDK_TARGET_CPU" = xaarch64; then
+        # The cygwin 'file' command only returns "PE32+ executable (DLL) (console), for MS Windows",
+        # without specifying which architecture it is for specifically. This has been fixed upstream.
+        # https://github.com/file/file/commit/b849b1af098ddd530094bf779b58431395db2e10#diff-ff2eced09e6860de75057dd731d092aeR142
+        CORRECT_MSVCR_ARCH="PE32+ executable"
      fi
    fi
    if $ECHO "$MSVC_DLL_FILETYPE" | $GREP "$CORRECT_MSVCR_ARCH" 2>&1 > /dev/null; then
@@ -549,24 +559,26 @@ AC_DEFUN([TOOLCHAIN_SETUP_MSVC_DLL],
  DLL_NAME="$1"
  MSVC_DLL=

+  if test "x$OPENJDK_TARGET_CPU" = xx86; then
+    vs_target_cpu=x86
+  elif test "x$OPENJDK_TARGET_CPU" = xx86_64; then
+    vs_target_cpu=x64
+  elif test "x$OPENJDK_TARGET_CPU" = xaarch64; then
+    vs_target_cpu=arm64
+  fi
+
  if test "x$MSVC_DLL" = x; then
    if test "x$VCINSTALLDIR" != x; then
      CYGWIN_VC_INSTALL_DIR="$VCINSTALLDIR"
      BASIC_FIXUP_PATH(CYGWIN_VC_INSTALL_DIR)
      if test "$VS_VERSION" -lt 2017; then
        # Probe: Using well-known location from Visual Studio 12.0 and older
-        if test "x$OPENJDK_TARGET_CPU_BITS" = x64; then
-          POSSIBLE_MSVC_DLL="$CYGWIN_VC_INSTALL_DIR/redist/x64/Microsoft.VC${VS_VERSION_INTERNAL}.CRT/$DLL_NAME"
-        else
-          POSSIBLE_MSVC_DLL="$CYGWIN_VC_INSTALL_DIR/redist/x86/Microsoft.VC${VS_VERSION_INTERNAL}.CRT/$DLL_NAME"
-        fi
+        POSSIBLE_MSVC_DLL="$CYGWIN_VC_INSTALL_DIR/redist/$vs_target_cpu/Microsoft.VC${VS_VERSION_INTERNAL}.CRT/$DLL_NAME"
      else
-        # Probe: Using well-known location from VS 2017
-        if test "x$OPENJDK_TARGET_CPU_BITS" = x64; then
-          POSSIBLE_MSVC_DLL="`ls $CYGWIN_VC_INSTALL_DIR/Redist/MSVC/*/x64/Microsoft.VC${VS_VERSION_INTERNAL}.CRT/$DLL_NAME`"
-        else
-          POSSIBLE_MSVC_DLL="`ls $CYGWIN_VC_INSTALL_DIR/Redist/MSVC/*/x86/Microsoft.VC${VS_VERSION_INTERNAL}.CRT/$DLL_NAME`"
-        fi
+        CYGWIN_VC_TOOLS_REDIST_DIR="$VCToolsRedistDir"
+        BASIC_FIXUP_PATH(CYGWIN_VC_TOOLS_REDIST_DIR)
+        # Probe: Using well-known location from VS 2017 and VS 2019
+        POSSIBLE_MSVC_DLL="`ls $CYGWIN_VC_TOOLS_REDIST_DIR/$vs_target_cpu/Microsoft.VC${VS_VERSION_INTERNAL}.CRT/$DLL_NAME`"
      fi
      # In case any of the above finds more than one file, loop over them.
      for possible_msvc_dll in $POSSIBLE_MSVC_DLL; do
@@ -598,13 +610,8 @@ AC_DEFUN([TOOLCHAIN_SETUP_MSVC_DLL],
    if test "x$VS100COMNTOOLS" != x; then
      CYGWIN_VS_TOOLS_DIR="$VS100COMNTOOLS/.."
      BASIC_WINDOWS_REWRITE_AS_UNIX_PATH(CYGWIN_VS_TOOLS_DIR)
-      if test "x$OPENJDK_TARGET_CPU_BITS" = x64; then
-        POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VS_TOOLS_DIR" -name $DLL_NAME \
-	    | $GREP -i /x64/ | $HEAD --lines 1`
-      else
-        POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VS_TOOLS_DIR" -name $DLL_NAME \
-	    | $GREP -i /x86/ | $HEAD --lines 1`
-      fi
+      POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VS_TOOLS_DIR" -name $DLL_NAME \
+        | $GREP -i /$vs_target_cpu/ | $HEAD --lines 1`
      TOOLCHAIN_CHECK_POSSIBLE_MSVC_DLL([$DLL_NAME], [$POSSIBLE_MSVC_DLL],
          [search of VS100COMNTOOLS])
    fi
@@ -614,17 +621,17 @@ AC_DEFUN([TOOLCHAIN_SETUP_MSVC_DLL],
    # Probe: Search wildly in the VCINSTALLDIR. We've probably lost by now.
    # (This was the original behaviour; kept since it might turn something up)
    if test "x$CYGWIN_VC_INSTALL_DIR" != x; then
-      if test "x$OPENJDK_TARGET_CPU_BITS" = x64; then
+      if test "x$OPENJDK_TARGET_CPU" = xx86; then
        POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VC_INSTALL_DIR" -name $DLL_NAME \
-	    | $GREP x64 | $HEAD --lines 1`
-      else
-        POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VC_INSTALL_DIR" -name $DLL_NAME \
-	    | $GREP x86 | $GREP -v ia64 | $GREP -v x64 | $HEAD --lines 1`
+        | $GREP x86 | $GREP -v ia64 | $GREP -v x64 | $GREP -v arm64 | $HEAD --lines 1`
        if test "x$POSSIBLE_MSVC_DLL" = x; then
          # We're grasping at straws now...
          POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VC_INSTALL_DIR" -name $DLL_NAME \
 	      | $HEAD --lines 1`
        fi
+      else
+        POSSIBLE_MSVC_DLL=`$FIND "$CYGWIN_VC_INSTALL_DIR" -name $DLL_NAME \
+          | $GREP $vs_target_cpu | $HEAD --lines 1`
      fi

      TOOLCHAIN_CHECK_POSSIBLE_MSVC_DLL([$DLL_NAME], [$POSSIBLE_MSVC_DLL],
@@ -708,8 +715,12 @@ AC_DEFUN([TOOLCHAIN_SETUP_VS_RUNTIME_DLLS],
      CYGWIN_WINDOWSSDKDIR="${WINDOWSSDKDIR}"
      BASIC_FIXUP_PATH([CYGWIN_WINDOWSSDKDIR])
      dll_subdir=$OPENJDK_TARGET_CPU
-      if test "x$dll_subdir" = "xx86_64"; then
+      if test "x$OPENJDK_TARGET_CPU" = "xaarch64"; then
+        dll_subdir="arm64"
+      elif test "x$OPENJDK_TARGET_CPU" = "xx86_64"; then
        dll_subdir="x64"
+      elif test "x$OPENJDK_TARGET_CPU" = "xx86"; then
+        dll_subdir="x86"
      fi
      UCRT_DLL_DIR="$CYGWIN_WINDOWSSDKDIR/Redist/ucrt/DLLs/$dll_subdir"
      if test -z "$(ls -d "$UCRT_DLL_DIR/"*.dll 2> /dev/null)"; then
@@ -732,3 +743,49 @@ AC_DEFUN([TOOLCHAIN_SETUP_VS_RUNTIME_DLLS],
  fi
  AC_SUBST(UCRT_DLL_DIR)
 ])
+
+# Setup the sysroot flags and add them to global CFLAGS and LDFLAGS so
+# that configure can use them while detecting compilers.
+# TOOLCHAIN_TYPE is available here.
+# Param 1 - Optional prefix to all variables. (e.g BUILD_)
+AC_DEFUN([TOOLCHAIN_SETUP_VISUAL_STUDIO_SYSROOT_FLAGS],
+[
+  # Convert $1VS_INCLUDE into $1SYSROOT_CFLAGS
+  OLDIFS="$IFS"
+  IFS=";"
+  for i in [$]$1VS_INCLUDE; do
+    ipath=$i
+    # Only process non-empty elements
+    if test "x$ipath" != x; then
+      IFS="$OLDIFS"
+      # Check that directory exists before calling fixup_path
+      testpath=$ipath
+      BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([testpath])
+      if test -d "$testpath"; then
+        BASIC_FIXUP_PATH([ipath])
+        $1SYSROOT_CFLAGS="[$]$1SYSROOT_CFLAGS -I$ipath"
+      fi
+      IFS=";"
+    fi
+  done
+  # Convert $1VS_LIB into $1SYSROOT_LDFLAGS
+  for i in [$]$1VS_LIB; do
+    libpath=$i
+    # Only process non-empty elements
+    if test "x$libpath" != x; then
+      IFS="$OLDIFS"
+      # Check that directory exists before calling fixup_path
+      testpath=$libpath
+      BASIC_WINDOWS_REWRITE_AS_UNIX_PATH([testpath])
+      if test -d "$testpath"; then
+        BASIC_FIXUP_PATH([libpath])
+        $1SYSROOT_LDFLAGS="[$]$1SYSROOT_LDFLAGS -libpath:$libpath"
+      fi
+      IFS=";"
+    fi
+  done
+  IFS="$OLDIFS"
+
+  AC_SUBST($1SYSROOT_CFLAGS)
+  AC_SUBST($1SYSROOT_LDFLAGS)
+])
--- a/make/autoconf/version-numbers
+++ b/make/autoconf/version-numbers
@@ -28,16 +28,16 @@

 DEFAULT_VERSION_FEATURE=11
 DEFAULT_VERSION_INTERIM=0
-DEFAULT_VERSION_UPDATE=9
-DEFAULT_VERSION_PATCH=1
+DEFAULT_VERSION_UPDATE=14
+DEFAULT_VERSION_PATCH=0
 DEFAULT_VERSION_EXTRA1=0
 DEFAULT_VERSION_EXTRA2=0
 DEFAULT_VERSION_EXTRA3=0
-DEFAULT_VERSION_DATE=2020-11-04
+DEFAULT_VERSION_DATE=2022-01-18
 DEFAULT_VERSION_CLASSFILE_MAJOR=55  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
 DEFAULT_VERSION_CLASSFILE_MINOR=0
 DEFAULT_ACCEPTABLE_BOOT_VERSIONS="10 11"
-DEFAULT_PROMOTED_VERSION_PRE=ea
+DEFAULT_PROMOTED_VERSION_PRE=

 LAUNCHER_NAME=openjdk
 PRODUCT_NAME=OpenJDK
--- a/make/common/MakeBase.gmk
+++ b/make/common/MakeBase.gmk
@@ -583,40 +583,58 @@ endef
 #     foo/bar/baz, /foo/bar -> <empty>
 #
 # The x prefix is used to preserve the presence of the initial slash
+# On Windows paths are treated as case-insensitive
 #
 # $1 - Path to compare
 # $2 - Other path to compare
 FindCommonPathPrefix = \
-    $(patsubst x%,%,$(subst $(SPACE),/,$(strip \
-        $(call FindCommonPathPrefixHelper, \
-            $(subst /,$(SPACE),x$(strip $1)), $(subst /,$(SPACE),x$(strip $2))) \
-    )))
+    $(call DecodeSpace,$(patsubst x%,%,$(subst $(SPACE),/,$(strip \
+        $(call FindCommonPathPrefixHelper1, \
+            $(subst /,$(SPACE),x$(call EncodeSpace,$(strip $1))), \
+            $(subst /,$(SPACE),x$(call EncodeSpace,$(strip $2)))) \
+    ))))

-FindCommonPathPrefixHelper = \
+FindCommonPathPrefixHelper1 = \
+    $(if $(filter $(OPENJDK_TARGET_OS), windows), \
+        $(call FindCommonPathPrefixHelper2,$(call uppercase,$1),$(call uppercase,$2),$1), \
+        $(call FindCommonPathPrefixHelper2,$1,$2,$1))
+
+FindCommonPathPrefixHelper2 = \
    $(if $(call equals, $(firstword $1), $(firstword $2)), \
-      $(firstword $1) \
-      $(call FindCommonPathPrefixHelper, \
-          $(wordlist 2, $(words $1), $1), $(wordlist 2, $(words $2), $2) \
+      $(if $(call equals, $(firstword $1),),, \
+        $(firstword $3) \
+        $(call FindCommonPathPrefixHelper2, \
+            $(wordlist 2, $(words $1), $1), \
+            $(wordlist 2, $(words $2), $2), \
+            $(wordlist 2, $(words $3), $3) \
+        ) \
      ) \
    )

-# Convert a partial path into as many directory levels of ../, removing
-# leading and following /.
-# Ex: foo/bar/baz/ -> ../../..
-#     foo/bar -> ../..
-#     /foo -> ..
-DirToDotDot = \
-    $(subst $(SPACE),/,$(foreach d, $(subst /,$(SPACE),$1),..))
-
 # Computes the relative path from a directory to a file
 # $1 - File to compute the relative path to
 # $2 - Directory to compute the relative path from
 RelativePath = \
-    $(eval $1_prefix := $(call FindCommonPathPrefix, $1, $2)) \
-    $(eval $1_dotdots := $(call DirToDotDot, $(patsubst $($(strip $1)_prefix)%, %, $2))) \
-    $(eval $1_dotdots := $(if $($(strip $1)_dotdots),$($(strip $1)_dotdots),.)) \
-    $(eval $1_suffix := $(patsubst $($(strip $1)_prefix)/%, %, $1)) \
-    $($(strip $1)_dotdots)/$($(strip $1)_suffix)
+    $(call DecodeSpace,$(strip $(call RelativePathHelper,$(call EncodeSpace \
+        ,$(strip $1)),$(call EncodeSpace \
+        ,$(strip $2)),$(call EncodeSpace \
+        ,$(call FindCommonPathPrefix,$1,$2)))))
+
+RelativePathHelper = \
+    $(eval $3_prefix_length := $(words $(subst /,$(SPACE),$3))) \
+    $(eval $1_words := $(subst /,$(SPACE),$1)) \
+    $(eval $2_words := $(subst /,$(SPACE),$2)) \
+    $(if $(call equals,$($3_prefix_length),0),, \
+        $(eval $1_words := $(wordlist 2,$(words $($1_words)),$(wordlist \
+            $($3_prefix_length),$(words $($1_words)),$($1_words)))) \
+        $(eval $2_words := $(wordlist 2,$(words $($2_words)),$(wordlist \
+            $($3_prefix_length),$(words $($2_words)),$($2_words)))) \
+    ) \
+    $(eval $1_suffix := $(subst $(SPACE),/,$($1_words))) \
+    $(eval $2_dotdots := $(subst $(SPACE),/,$(foreach d,$($2_words),..))) \
+    $(if $($1_suffix), \
+        $(if $($2_dotdots), $($2_dotdots)/$($1_suffix), $($1_suffix)), \
+        $(if $($2_dotdots), $($2_dotdots), .))

 ################################################################################
 # link-file-* works similarly to install-file but creates a symlink instead.
--- a/make/common/NativeCompilation.gmk
+++ b/make/common/NativeCompilation.gmk
@@ -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
@@ -239,15 +239,30 @@ ifeq ($(ALLOW_ABSOLUTE_PATHS_IN_OUTPUT)-$(FILE_MACRO_CFLAGS), false-)
        ) \
      )

-  # When compiling with relative paths, the deps file comes out with relative
-  # paths.
+  # When compiling with relative paths, the deps file may come out with relative
+  # paths, and that path may start with './'. First remove any leading ./, then
+  # add WORKSPACE_ROOT to any line not starting with /, while allowing for
+  # leading spaces. There may also be multiple entries on the same line, so start
+  # with splitting such lines.
+  # Non GNU sed (BSD on macosx) cannot substitue in literal \n using regex.
+  # Instead use a bash escaped literal newline. To avoid having unmatched quotes
+  # ruin the ability for an editor to properly syntax highlight this file, define
+  # that newline sequence as a separate variable and add the closing quote behind
+  # a comment.
+  sed_newline := \'$$'\n''#'
  ifeq ($(TOOLCHAIN_TYPE), solstudio)
    define fix-deps-file
 	$(SED) -e 's|\./|$(WORKSPACE_ROOT)/|g' $1.tmp > $1
    endef
  else
    define fix-deps-file
-	$(SED) -e 's|^\([ ]*\)|\1$(WORKSPACE_ROOT)|' $1.tmp > $1
+	$(SED) \
+	    -e 's|\([^ ]\) \{1,\}\([^\\:]\)|\1 \\$(sed_newline) \2|g' \
+	    $1.tmp \
+	    | $(SED) \
+	        -e 's|^\([ ]*\)\./|\1|' \
+	        -e '/^[ ]*[^/ ]/s|^\([ ]*\)|\1$(WORKSPACE_ROOT)/|' \
+	        > $1
    endef
  endif
 else
@@ -823,13 +838,15 @@ define SetupNativeCompilationBody
        -include $$($1_PCH_DEPS_TARGETS_FILE)

        $1_PCH_COMMAND := $$($1_CC) $$($1_CFLAGS) $$($1_EXTRA_CFLAGS) $$($1_SYSROOT_CFLAGS) \
-            $$($1_OPT_CFLAGS) -x c++-header -c $(C_FLAG_DEPS) $$($1_PCH_DEPS_FILE)
+            $$($1_OPT_CFLAGS) -x c++-header -c $(C_FLAG_DEPS) \
+            $$(addsuffix .tmp, $$($1_PCH_DEPS_FILE))

        $$($1_PCH_FILE): $$($1_PRECOMPILED_HEADER) $$($1_COMPILE_VARDEPS_FILE)
 		$$(call LogInfo, Generating precompiled header)
 		$$(call MakeDir, $$(@D))
 		$$(call ExecuteWithLog, $$@, $$(call MakeCommandRelative, \
 		    $$($1_PCH_COMMAND) $$< -o $$@))
+		$$(call fix-deps-file, $$($1_PCH_DEPS_FILE))
 		$(SED) $(DEPENDENCY_TARGET_SED_PATTERN) $$($1_PCH_DEPS_FILE) \
 		    > $$($1_PCH_DEPS_TARGETS_FILE)

@@ -991,6 +1008,13 @@ define SetupNativeCompilationBody
              $(CD) $$($1_OUTPUT_DIR) && \
                  $$($1_OBJCOPY) --add-gnu-debuglink=$$($1_DEBUGINFO_FILES) $$($1_TARGET)

+        else ifeq ($(OPENJDK_TARGET_OS), aix)
+          # AIX does not provide the equivalent of OBJCOPY to extract debug symbols,
+          # so we copy the compiled object with symbols to the .debuginfo file, which
+          # happens prior to the STRIP_CMD on the original target object file.
+          $1_DEBUGINFO_FILES := $$($1_OUTPUT_DIR)/$$($1_NOSUFFIX).debuginfo 
+          $1_CREATE_DEBUGINFO_CMDS := $(CP) $$($1_TARGET) $$($1_DEBUGINFO_FILES)
+
        else ifeq ($(OPENJDK_TARGET_OS), macosx)
          $1_DEBUGINFO_FILES := \
              $$($1_OUTPUT_DIR)/$$($1_BASENAME).dSYM/Contents/Info.plist \
--- a/make/common/TestFilesCompilation.gmk
+++ b/make/common/TestFilesCompilation.gmk
@@ -60,14 +60,16 @@ define SetupTestFilesCompilationBody
  ifeq ($$($1_TYPE), LIBRARY)
    $1_PREFIX = lib
    $1_OUTPUT_SUBDIR := lib
-    $1_CFLAGS := $(CFLAGS_TESTLIB)
-    $1_LDFLAGS := $(LDFLAGS_TESTLIB) $(call SET_SHARED_LIBRARY_ORIGIN)
+    $1_BASE_CFLAGS := $(CFLAGS_JDKLIB)
+    $1_BASE_CXXFLAGS := $(CXXFLAGS_JDKLIB)
+    $1_LDFLAGS := $(LDFLAGS_JDKLIB) $(call SET_SHARED_LIBRARY_ORIGIN)
    $1_COMPILATION_TYPE := LIBRARY
  else ifeq ($$($1_TYPE), PROGRAM)
    $1_PREFIX = exe
    $1_OUTPUT_SUBDIR := bin
-    $1_CFLAGS := $(CFLAGS_TESTEXE)
-    $1_LDFLAGS := $(LDFLAGS_TESTEXE)
+    $1_BASE_CFLAGS := $(CFLAGS_JDKEXE)
+    $1_BASE_CXXFLAGS := $(CXXFLAGS_JDKEXE)
+    $1_LDFLAGS := $(LDFLAGS_JDKEXE) $(LDFLAGS_TESTEXE)
    $1_COMPILATION_TYPE := EXECUTABLE
  else
    $$(error Unknown type: $$($1_TYPE))
@@ -75,7 +77,7 @@ define SetupTestFilesCompilationBody

  # Locate all files with the matching prefix
  $1_FILE_LIST := \
-      $$(call FindFiles, $$($1_SOURCE_DIRS), $$($1_PREFIX)*.c)
+      $$(call FindFiles, $$($1_SOURCE_DIRS), $$($1_PREFIX)*.c  $$($1_PREFIX)*.cpp $$($1_PREFIX)*.m)

  $1_EXCLUDE_PATTERN := $$(addprefix %/, $$($1_EXCLUDE))
  $1_FILTERED_FILE_LIST := $$(filter-out $$($1_EXCLUDE_PATTERN), $$($1_FILE_LIST))
@@ -91,9 +93,13 @@ define SetupTestFilesCompilationBody
        INCLUDE_FILES := $$(notdir $$(file)), \
        OBJECT_DIR := $$($1_OUTPUT_DIR)/support/$$(name), \
        OUTPUT_DIR := $$($1_OUTPUT_DIR)/$$($1_OUTPUT_SUBDIR), \
-        CFLAGS := $$($1_CFLAGS) $$($1_CFLAGS_$$(name)), \
+        CFLAGS := $$($1_BASE_CFLAGS) $$($1_CFLAGS) $$($1_CFLAGS_$$(name)), \
+        CXXFLAGS := $$($1_BASE_CXXFLAGS) $$($1_CFLAGS) $$($1_CFLAGS_$$(name)), \
        LDFLAGS := $$($1_LDFLAGS) $$($1_LDFLAGS_$$(name)), \
+        DISABLED_WARNINGS_CXX_solstudio := wvarhidenmem, \
+        DISABLED_WARNINGS_CXX_gcc := format, \
        LIBS := $$($1_LIBS_$$(name)), \
+        TOOLCHAIN := $(if $$(filter %.cpp, $$(file)), TOOLCHAIN_LINK_CXX, TOOLCHAIN_DEFAULT), \
        OPTIMIZATION := $$(if $$($1_OPTIMIZATION_$$(name)),$$($1_OPTIMIZATION_$$(name)),LOW), \
        COPY_DEBUG_SYMBOLS := false, \
        STRIP_SYMBOLS := false, \
--- a/make/conf/jib-profiles.js
+++ b/make/conf/jib-profiles.js
@@ -242,7 +242,7 @@ var getJibProfilesCommon = function (input, data) {
        dependencies: ["boot_jdk", "gnumake", "jtreg", "jib", "autoconf"],
        default_make_targets: ["product-bundles", "test-bundles", "static-libs-bundles"],
        configure_args: concat(["--enable-jtreg-failure-handler"],
-            "--with-exclude-translations=de,es,fr,it,ko,pt_BR,sv,ca,tr,cs,sk,ja_JP_A,ja_JP_HA,ja_JP_HI,ja_JP_I,zh_TW,zh_HK",
+            "--with-exclude-translations=es,fr,it,ko,pt_BR,sv,ca,tr,cs,sk,ja_JP_A,ja_JP_HA,ja_JP_HI,ja_JP_I,zh_TW,zh_HK",
            "--disable-manpages",
            versionArgs(input, common))
    };
@@ -854,7 +854,7 @@ var getJibProfilesDependencies = function (input, common) {

    var devkit_platform_revisions = {
        linux_x64: "gcc7.3.0-OEL6.4+1.1",
-        macosx_x64: "Xcode9.4-MacOSX10.13+1.0",
+        macosx_x64: "Xcode11.3.1-MacOSX10.15+1.0",
        solaris_x64: "SS12u4-Solaris11u1+1.0",
        solaris_sparcv9: "SS12u4-Solaris11u1+1.1",
        windows_x64: "VS2017-15.9.16+1.0",
@@ -918,11 +918,12 @@ var getJibProfilesDependencies = function (input, common) {
        },

        jtreg: {
-            server: "javare",
-            revision: "4.2",
-            build_number: "b13",
+            server: "jpg",
+            product: "jtreg",
+            version: "5.1",
+            build_number: "b01",
            checksum_file: "MD5_VALUES",
-            file: "jtreg_bin-4.2.zip",
+            file: "bundles/jtreg_bin-5.1.zip",
            environment_name: "JT_HOME",
            environment_path: input.get("jtreg", "install_path") + "/jtreg/bin"
        },
@@ -1160,15 +1161,15 @@ var concatObjects = function (o1, o2) {
 * @param patch Override patch version
 * @returns {String} The numeric version string
 */
-var getVersion = function (feature, interim, update, patch) {
+var getVersion = function (feature, interim, update, patch, extra1, extra2, extra3) {
    var version_numbers = getVersionNumbers();
    var version = (feature != null ? feature : version_numbers.get("DEFAULT_VERSION_FEATURE"))
        + "." + (interim != null ? interim : version_numbers.get("DEFAULT_VERSION_INTERIM"))
        + "." + (update != null ? update :  version_numbers.get("DEFAULT_VERSION_UPDATE"))
        + "." + (patch != null ? patch : version_numbers.get("DEFAULT_VERSION_PATCH"))
-        + "." + version_numbers.get("DEFAULT_VERSION_EXTRA1")
-        + "." + version_numbers.get("DEFAULT_VERSION_EXTRA2")
-        + "." + version_numbers.get("DEFAULT_VERSION_EXTRA3");
+        + "." + (extra1 != null ? extra1 : version_numbers.get("DEFAULT_VERSION_EXTRA1"))
+        + "." + (extra2 != null ? extra2 : version_numbers.get("DEFAULT_VERSION_EXTRA2"))
+        + "." + (extra3 != null ? extra3 : version_numbers.get("DEFAULT_VERSION_EXTRA3"));
    while (version.match(".*\\.0$")) {
        version = version.substring(0, version.length - 2);
    }
--- a/make/conf/test-dependencies
+++ b/make/conf/test-dependencies
@@ -0,0 +1,43 @@
+#
+# Copyright (c) 2020, 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
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.  Oracle designates this
+# particular file as subject to the "Classpath" exception as provided
+# by Oracle in the LICENSE file that accompanied this code.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#
+
+# Versions and download locations for dependencies used by pre-submit testing.
+
+BOOT_JDK_VERSION=11
+JTREG_VERSION=5.1
+JTREG_BUILD=b01
+GTEST_VERSION=1.8.1
+
+LINUX_X64_BOOT_JDK_FILENAME=openjdk-11_linux-x64_bin.tar.gz
+LINUX_X64_BOOT_JDK_URL=https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.12%2B7/OpenJDK11U-jdk_x64_linux_hotspot_11.0.12_7.tar.gz
+LINUX_X64_BOOT_JDK_SHA256=8770f600fc3b89bf331213c7aa21f8eedd9ca5d96036d1cd48cb2748a3dbefd2
+
+WINDOWS_X64_BOOT_JDK_FILENAME=openjdk-11_windows-x64_bin.zip
+WINDOWS_X64_BOOT_JDK_URL=https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.12%2B7/OpenJDK11U-jdk_x64_windows_hotspot_11.0.12_7.zip
+WINDOWS_X64_BOOT_JDK_SHA256=c54123dd4b0d6473221539e7003b8ca1c1757c5588c46465565b03bf8781f807
+
+MACOS_X64_BOOT_JDK_FILENAME=openjdk-11_osx-x64_bin.tar.gz
+MACOS_X64_BOOT_JDK_URL=https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.12%2B7/OpenJDK11U-jdk_x64_mac_hotspot_11.0.12_7.tar.gz
+MACOS_X64_BOOT_JDK_SHA256=13d056ee9a57bf2d5b3af4504c8f8cf7a246c4dff78f96b70dd05dad98075855
--- a/make/copy/Copy-java.base.gmk
+++ b/make/copy/Copy-java.base.gmk
@@ -43,38 +43,43 @@ ifneq ($(findstring $(OPENJDK_TARGET_OS), windows aix),)
 endif

 ################################################################################
-# Copy the microsoft runtime libraries on windows
+# Copy the microsoft runtime libraries on windows, but only if we are not
+# creating a buildjdk. If we are, the provided runtime librareis are made for
+# the target platform, not the build platform (and we should not need to bundle
+# anything with the minimalistic, locally-only buildjdk.)
 ifeq ($(OPENJDK_TARGET_OS), windows)
+  ifneq ($(CREATING_BUILDJDK), true)

-  # Chmod to avoid permission issues if bundles are unpacked on unix platforms.
-  define copy-and-chmod
+    # Chmod to avoid permission issues if bundles are unpacked on unix platforms.
+    define copy-and-chmod
 	$(install-file)
 	$(CHMOD) a+rx $@
-  endef
+    endef

-  # Use separate macro calls in case the source files are not in the same
-  # directory.
-  $(eval $(call SetupCopyFiles,COPY_MSVCR, \
+    # Use separate macro calls in case the source files are not in the same
+    # directory.
+    $(eval $(call SetupCopyFiles,COPY_MSVCR, \
      DEST := $(LIB_DST_DIR), \
      FILES := $(MSVCR_DLL), \
      MACRO := copy-and-chmod))

-  $(eval $(call SetupCopyFiles,COPY_MSVCP, \
+    $(eval $(call SetupCopyFiles,COPY_MSVCP, \
      DEST := $(LIB_DST_DIR), \
      FILES := $(MSVCP_DLL), \
      MACRO := copy-and-chmod))

-  TARGETS += $(COPY_MSVCR) $(COPY_MSVCP)
+    TARGETS += $(COPY_MSVCR) $(COPY_MSVCP)

-  ifneq ($(UCRT_DLL_DIR), )
-    $(eval $(call SetupCopyFiles, COPY_UCRT_DLLS, \
+    ifneq ($(UCRT_DLL_DIR), )
+      $(eval $(call SetupCopyFiles, COPY_UCRT_DLLS, \
        DEST := $(LIB_DST_DIR), \
        SRC := $(UCRT_DLL_DIR), \
        FILES := $(wildcard $(UCRT_DLL_DIR)/*.dll), \
        MACRO := copy-and-chmod, \
-    ))
+      ))

-    TARGETS += $(COPY_UCRT_DLLS)
+      TARGETS += $(COPY_UCRT_DLLS)
+    endif
  endif
 endif

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