JBR-4188 add exec permissions

Added check for AppContext

jb/project/tools/common/scripts/common.sh

@@ -12,6 +12,8 @@ TZ=UTC
 export TZ
 SOURCE_DATE_EPOCH="$(git log -1 --pretty=%ct)"
 export SOURCE_DATE_EPOCH
+USER=builduser
+export USER
 
 case "$OS_NAME" in
     Linux)
@@ -34,8 +36,7 @@ REPRODUCIBLE_BUILD_OPTS="--enable-reproducible-build
   --with-source-date=$SOURCE_DATE_EPOCH
   --with-hotspot-build-time=$BUILD_TIME
   --with-copyright-year=$COPYRIGHT_YEAR
-  --with-native-debug-symbols=none
-  --with-build-user=builduser"
+  --disable-absolute-paths-in-output"
 
 function do_exit() {
   exit_code=$1

jb/project/tools/linux/scripts/mkimages_x64.sh

@@ -100,12 +100,6 @@ case "$bundle_type" in
   "jcef")
     do_reset_changes=1
     ;;
-  "dcevm")
-    HEAD_REVISION=$(git rev-parse HEAD)
-    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
-    do_reset_dcevm=1
-    do_reset_changes=1
-    ;;
   "nomod" | "")
     bundle_type=""
     ;;
@@ -130,7 +124,7 @@ JBRSDK_BUNDLE=jbrsdk
 echo Fixing permissions
 chmod -R a+r $JSDK
 
-if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "fd" ]; then
   git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
   update_jsdk_mods $JSDK $JCEF_PATH/jmods $JSDK/jmods $JSDK_MODS_DIR || do_exit $?
   cp $JCEF_PATH/jmods/* $JSDK_MODS_DIR # $JSDK/jmods is not changed
@@ -144,7 +138,7 @@ create_image_bundle "jbr${jbr_name_postfix}" "jbr" $JSDK_MODS_DIR "$modules" ||
 
 # create sdk image bundle
 modules=$(cat $JSDK/release | grep MODULES | sed s/MODULES=//g | sed s/' '/','/g | sed s/\"//g | sed s/\\n//g) || do_exit $?
-if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
   modules=${modules},$(get_mods_list "$JCEF_PATH"/jmods)
 fi
 create_image_bundle "$JBRSDK_BUNDLE${jbr_name_postfix}" $JBRSDK_BUNDLE $JSDK_MODS_DIR "$modules" || do_exit $?

jb/project/tools/mac/scripts/mkimages.sh

@@ -142,12 +142,6 @@ case "$bundle_type" in
   "jcef")
     do_reset_changes=1
     ;;
-  "dcevm")
-    HEAD_REVISION=$(git rev-parse HEAD)
-    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
-    do_reset_dcevm=1
-    do_reset_changes=1
-    ;;
   "nomod" | "")
     bundle_type=""
     ;;
@@ -174,7 +168,7 @@ JSDK=$IMAGES_DIR/jdk-bundle/jdk-$version_dir.jdk/Contents/Home
 JSDK_MODS_DIR=$IMAGES_DIR/jmods
 JBRSDK_BUNDLE=jbrsdk
 
-if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "fd" ]; then
   git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
   update_jsdk_mods "$JSDK" "$JCEF_PATH"/jmods "$JSDK"/jmods "$JSDK_MODS_DIR" || do_exit $?
   cp $JCEF_PATH/jmods/* $JSDK_MODS_DIR # $JSDK/jmods is not changed
@@ -188,7 +182,7 @@ create_image_bundle "jbr${jbr_name_postfix}" "jbr" $JSDK_MODS_DIR "$modules" ||
 
 # create sdk image bundle
 modules=$(cat "$JSDK"/release | grep MODULES | sed s/MODULES=//g | sed s/' '/','/g | sed s/\"//g | sed s/\\n//g) || do_exit $?
-if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
   modules=${modules},$(get_mods_list "$JCEF_PATH"/jmods)
 fi
 create_image_bundle "$JBRSDK_BUNDLE${jbr_name_postfix}" "$JBRSDK_BUNDLE" "$JSDK_MODS_DIR" "$modules" || do_exit $?

jb/project/tools/patches/dcevm/0003-Fix-class-cast-exception-on-redefinition-of-class-A-.patch

@@ -1,29 +0,0 @@
-From 9b18096f241be0350245868e8cf26729f6c3d110 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Wed, 11 Mar 2020 14:19:34 +0100
-Subject: [PATCH 03/45] Fix class cast exception on redefinition of class A,
- that is superclass of B that has anonymous class C
-
----
- src/hotspot/share/oops/instanceKlass.cpp | 5 ++++-
- 1 file changed, 4 insertions(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index db5b8da58fc..6d9e5116df1 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -908,7 +908,10 @@ bool InstanceKlass::link_class_impl(TRAPS) {
- 
-     if (!is_linked()) {
-       if (!is_rewritten()) {
--        {
-+        // (DCEVM): If class A is being redefined and class B->A (B is extended from A) and B is host class of anonymous class C
-+        // then second redefinition fails with cannot cast klass exception. So we currently turn off bytecode verification
-+        // on redefinition.
-+        if (!AllowEnhancedClassRedefinition || !newest_version()->is_redefining()) {
-           bool verify_ok = verify_code(THREAD);
-           if (!verify_ok) {
-             return false;
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0004-Support-for-Lambda-class-redefinition.patch

@@ -1,206 +0,0 @@
-From 784dd5e16922110b0ee802d5bf1063e2b94499bc Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 4 Oct 2020 21:12:12 +0200
-Subject: [PATCH 04/45] Support for Lambda class redefinition
-
----
- .../share/classfile/classLoaderData.cpp       |  9 +++
- .../share/classfile/classLoaderData.hpp       |  2 +-
- .../share/classfile/systemDictionary.cpp      | 10 ++-
- .../prims/jvmtiEnhancedRedefineClasses.cpp    | 65 +++++++++++++++++--
- .../prims/jvmtiEnhancedRedefineClasses.hpp    |  1 +
- .../share/prims/resolvedMethodTable.cpp       |  2 +
- 6 files changed, 80 insertions(+), 9 deletions(-)
-
-diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
-index 340ffadf837..db50b3edee8 100644
---- a/src/hotspot/share/classfile/classLoaderData.cpp
-+++ b/src/hotspot/share/classfile/classLoaderData.cpp
-@@ -599,6 +599,15 @@ Dictionary* ClassLoaderData::create_dictionary() {
-   return new Dictionary(this, size, resizable);
- }
- 
-+void ClassLoaderData::exchange_holders(ClassLoaderData* cld) {
-+  oop holder_oop = _holder.peek();
-+  _holder.replace(cld->_holder.peek());
-+  cld->_holder.replace(holder_oop);
-+  WeakHandle<vm_class_loader_data> exchange = _holder;
-+  _holder = cld->_holder;
-+  cld->_holder = exchange;
-+}
-+
- // Tell the GC to keep this klass alive while iterating ClassLoaderDataGraph
- oop ClassLoaderData::holder_phantom() const {
-   // A klass that was previously considered dead can be looked up in the
-diff --git a/src/hotspot/share/classfile/classLoaderData.hpp b/src/hotspot/share/classfile/classLoaderData.hpp
-index 5a81ab90ca3..bda39f3e353 100644
---- a/src/hotspot/share/classfile/classLoaderData.hpp
-+++ b/src/hotspot/share/classfile/classLoaderData.hpp
-@@ -175,7 +175,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
- 
-   oop holder_no_keepalive() const;
-   oop holder_phantom() const;
--
-+  void exchange_holders(ClassLoaderData* cld);
-  private:
-   void unload();
-   bool keep_alive() const       { return _keep_alive > 0; }
-diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
-index 2bfd9cb802f..cea614a574f 100644
---- a/src/hotspot/share/classfile/systemDictionary.cpp
-+++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -825,10 +825,14 @@ InstanceKlass* SystemDictionary::resolve_hidden_class_from_stream(
-                                                      Symbol* class_name,
-                                                      Handle class_loader,
-                                                      const ClassLoadInfo& cl_info,
-+                                                     InstanceKlass* old_klass,
-                                                      TRAPS) {
- 
-   EventClassLoad class_load_start_event;
-   ClassLoaderData* loader_data;
-+ 
-+  bool is_redefining = (old_klass != NULL);
-+  
- 
-   // - for hidden classes that are not strong: create a new CLD that has a class holder and
-   //                                           whose loader is the Lookup class's loader.
-@@ -845,9 +849,13 @@ InstanceKlass* SystemDictionary::resolve_hidden_class_from_stream(
-                                                       class_name,
-                                                       loader_data,
-                                                       cl_info,
--                                                      false, // pick_newest
-+                                                      is_redefining, // pick_newest
-                                                       CHECK_NULL);
-   assert(k != NULL, "no klass created");
-+  if (is_redefining && k != NULL) {
-+    k->set_redefining(true);
-+    k->set_old_version(old_klass);
-+  }
- 
-   // Hidden classes that are not strong must update ClassLoaderData holder
-   // so that they can be unloaded when the mirror is no longer referenced.
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 5308b079e67..c1b1b354541 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -492,6 +492,8 @@ 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;
-@@ -754,12 +756,34 @@ 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();
- 
-@@ -1440,6 +1464,30 @@ 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];
-@@ -1977,7 +2025,10 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
-   // Find classes not directly redefined, but affected by a redefinition (because one of its supertypes is redefined)
-   AffectedKlassClosure closure(_affected_klasses);
-   // Updated in j10, from original SystemDictionary::classes_do
--  ClassLoaderDataGraph::dictionary_classes_do(&closure);
-+
-+  ClassLoaderDataGraph::classes_do(&closure);
-+  //ClassLoaderDataGraph::dictionary_classes_do(&closure);
-+
-   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
- 
-   // Sort the affected klasses such that a supertype is always on a smaller array index than its subtype.
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-index a48e07e3a6a..3551b06ecde 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-@@ -116,6 +116,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
-   void rollback();
-   static void mark_as_scavengable(nmethod* nm);
-   static void unpatch_bytecode(Method* method);
-+  static void fix_invoke_method(Method* method);
- 
-   // Figure out which new methods match old methods in name and signature,
-   // which methods have been added, and which are no longer present
-diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
-index 6a8128e844f..8644937dbbb 100644
---- a/src/hotspot/share/prims/resolvedMethodTable.cpp
-+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
-@@ -409,6 +409,8 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
-         InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
-         Method* newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
- 
-+        log_info(redefine, class, load, exceptions)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
-+
-         assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
-         assert(newer_method != NULL, "method_with_idnum() should not be NULL");
-         assert(old_method != newer_method, "sanity check");
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0005-Fix-no-original-bytecode-found-error-if-method-with-.patch

@@ -1,135 +0,0 @@
-From 97ab12615a56e90993b5df4615c6dbd7eb856ebb Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 23 May 2020 10:02:15 +0200
-Subject: [PATCH 05/45] Fix "no original bytecode found" error if method with
- bkp is missing
-
-Sometimes IDE can deploy class with erroneous method, such method has
-n bytecode, but breakpoint position can still exist.
----
- src/hotspot/share/interpreter/bytecodes.cpp    |  2 +-
- .../share/interpreter/interpreterRuntime.cpp   |  2 +-
- src/hotspot/share/oops/method.cpp              |  8 ++++----
- src/hotspot/share/oops/method.hpp              |  4 ++--
- .../prims/jvmtiEnhancedRedefineClasses.cpp     | 18 ++++++++++--------
- 5 files changed, 18 insertions(+), 16 deletions(-)
-
-diff --git a/src/hotspot/share/interpreter/bytecodes.cpp b/src/hotspot/share/interpreter/bytecodes.cpp
-index 6711ba735db..4f0b655265a 100644
---- a/src/hotspot/share/interpreter/bytecodes.cpp
-+++ b/src/hotspot/share/interpreter/bytecodes.cpp
-@@ -84,7 +84,7 @@ Bytecodes::Code Bytecodes::code_at(Method* method, int bci) {
- Bytecodes::Code Bytecodes::non_breakpoint_code_at(const Method* method, address bcp) {
-   assert(method != NULL, "must have the method for breakpoint conversion");
-   assert(method->contains(bcp), "must be valid bcp in method");
--  return method->orig_bytecode_at(method->bci_from(bcp));
-+  return method->orig_bytecode_at(method->bci_from(bcp), false);
- }
- 
- int Bytecodes::special_length_at(Bytecodes::Code code, address bcp, address end) {
-diff --git a/src/hotspot/share/interpreter/interpreterRuntime.cpp b/src/hotspot/share/interpreter/interpreterRuntime.cpp
-index d66ed24d862..9bfcd9eb479 100644
---- a/src/hotspot/share/interpreter/interpreterRuntime.cpp
-+++ b/src/hotspot/share/interpreter/interpreterRuntime.cpp
-@@ -788,7 +788,7 @@ JRT_END
- // Invokes
- 
- JRT_ENTRY(Bytecodes::Code, InterpreterRuntime::get_original_bytecode_at(JavaThread* current, Method* method, address bcp))
--  return method->orig_bytecode_at(method->bci_from(bcp));
-+  return method->orig_bytecode_at(method->bci_from(bcp), false);
- JRT_END
- 
- JRT_ENTRY(void, InterpreterRuntime::set_original_bytecode_at(JavaThread* current, 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 613c10a9d8c..a5a12599997 100644
---- a/src/hotspot/share/oops/method.cpp
-+++ b/src/hotspot/share/oops/method.cpp
-@@ -1853,14 +1853,14 @@ bool CompressedLineNumberReadStream::read_pair() {
- 
- #if INCLUDE_JVMTI
- 
--Bytecodes::Code Method::orig_bytecode_at(int bci) const {
-+Bytecodes::Code Method::orig_bytecode_at(int bci, bool no_fatal) const {
-   BreakpointInfo* bp = method_holder()->breakpoints();
-   for (; bp != NULL; bp = bp->next()) {
-     if (bp->match(this, bci)) {
-       return bp->orig_bytecode();
-     }
-   }
--  {
-+  if (!no_fatal) {
-     ResourceMark rm;
-     fatal("no original bytecode found in %s at bci %d", name_and_sig_as_C_string(), bci);
-   }
-@@ -1998,7 +1998,7 @@ BreakpointInfo::BreakpointInfo(Method* m, int bci) {
-   _signature_index = m->signature_index();
-   _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci);
-   if (_orig_bytecode == Bytecodes::_breakpoint)
--    _orig_bytecode = m->orig_bytecode_at(_bci);
-+    _orig_bytecode = m->orig_bytecode_at(_bci, false);
-   _next = NULL;
- }
- 
-@@ -2007,7 +2007,7 @@ void BreakpointInfo::set(Method* method) {
-   {
-     Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci);
-     if (code == Bytecodes::_breakpoint)
--      code = method->orig_bytecode_at(_bci);
-+      code = method->orig_bytecode_at(_bci, false);
-     assert(orig_bytecode() == code, "original bytecode must be the same");
-   }
- #endif
-diff --git a/src/hotspot/share/oops/method.hpp b/src/hotspot/share/oops/method.hpp
-index 030ddd1f675..a8d6507ff6c 100644
---- a/src/hotspot/share/oops/method.hpp
-+++ b/src/hotspot/share/oops/method.hpp
-@@ -226,7 +226,7 @@ class Method : public Metadata {
- 
-   // JVMTI breakpoints
- #if !INCLUDE_JVMTI
--  Bytecodes::Code orig_bytecode_at(int bci) const {
-+  Bytecodes::Code orig_bytecode_at(int bci, bool no_fatal) const {
-     ShouldNotReachHere();
-     return Bytecodes::_shouldnotreachhere;
-   }
-@@ -235,7 +235,7 @@ class Method : public Metadata {
-   };
-   u2   number_of_breakpoints() const {return 0;}
- #else // !INCLUDE_JVMTI
--  Bytecodes::Code orig_bytecode_at(int bci) const;
-+  Bytecodes::Code orig_bytecode_at(int bci, bool no_fatal) const;
-   void set_orig_bytecode_at(int bci, Bytecodes::Code code);
-   void set_breakpoint(int bci);
-   void clear_breakpoint(int bci);
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index c1b1b354541..ad05b4f34cf 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -1360,14 +1360,16 @@ void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method) {
- 
-     if (code == Bytecodes::_breakpoint) {
-       int bci = method->bci_from(bcp);
--      code = method->orig_bytecode_at(bci);
--      java_code = Bytecodes::java_code(code);
--      if (code != java_code &&
--           (java_code == Bytecodes::_getfield ||
--            java_code == Bytecodes::_putfield ||
--            java_code == Bytecodes::_aload_0)) {
--        // Let breakpoint table handling unpatch bytecode
--        method->set_orig_bytecode_at(bci, java_code);
-+      code = method->orig_bytecode_at(bci, true);
-+      if (code != Bytecodes::_shouldnotreachhere) {
-+        java_code = Bytecodes::java_code(code);
-+        if (code != java_code &&
-+             (java_code == Bytecodes::_getfield ||
-+              java_code == Bytecodes::_putfield ||
-+              java_code == Bytecodes::_aload_0)) {
-+          // Let breakpoint table handling unpatch bytecode
-+          method->set_orig_bytecode_at(bci, java_code);
-+        }
-       }
-     } else {
-       java_code = Bytecodes::java_code(code);
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0006-Replace-deleted-method-with-Universe-throw_no_such_m.patch

@@ -1,83 +0,0 @@
-From cb8d0e41bed94d0c8b8a4c51f692a4ca66dc3672 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 24 May 2020 12:07:42 +0200
-Subject: [PATCH 06/45] Replace deleted method with
- Universe::throw_no_such_method_error
-
-+ 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
----
- .../prims/jvmtiEnhancedRedefineClasses.cpp    |  2 +-
- .../share/prims/resolvedMethodTable.cpp       | 30 +++++++++----------
- 2 files changed, 16 insertions(+), 16 deletions(-)
-
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index ad05b4f34cf..95be32f0070 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -881,7 +881,7 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
-  // Calculated the difference between new and old class  (field change, method change, supertype change, ...).
- int VM_EnhancedRedefineClasses::calculate_redefinition_flags(InstanceKlass* new_class) {
-   int result = Klass::NoRedefinition;
--  log_info(redefine, class, load)("Comparing different class versions of class %s",new_class->name()->as_C_string());
-+  log_debug(redefine, class, load)("Comparing different class versions of class %s",new_class->name()->as_C_string());
- 
-   assert(new_class->old_version() != NULL, "must have old version");
-   InstanceKlass* the_class = InstanceKlass::cast(new_class->old_version());
-diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
-index 8644937dbbb..b8d039adff6 100644
---- a/src/hotspot/share/prims/resolvedMethodTable.cpp
-+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
-@@ -399,25 +399,25 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
- 
-       if (old_method->is_old()) {
- 
-+        InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
-+        Method* newer_method;
-+
-         // Method* new_method;
-         if (old_method->is_deleted()) {
--          // FIXME:(DCEVM) - check if exception can be thrown
--          // new_method = Universe::throw_no_such_method_error();
--          continue;
--        }
--
--        InstanceKlass* newer_klass = InstanceKlass::cast(old_method->method_holder()->new_version());
--        Method* newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
-+          newer_method = Universe::throw_no_such_method_error();
-+        } else {
-+          newer_method = newer_klass->method_with_idnum(old_method->orig_method_idnum());
- 
--        log_info(redefine, class, load, exceptions)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
-+          log_debug(redefine, class, update)("Adjusting method: '%s' of new class %s", newer_method->name_and_sig_as_C_string(), newer_klass->name()->as_C_string());
- 
--        assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
--        assert(newer_method != NULL, "method_with_idnum() should not be NULL");
--        assert(old_method != newer_method, "sanity check");
-+          assert(newer_klass == newer_method->method_holder(), "call after swapping redefined guts");
-+          assert(newer_method != NULL, "method_with_idnum() should not be NULL");
-+          assert(old_method != newer_method, "sanity check");
- 
--        if (_the_table->lookup(newer_method) != NULL) {
--          // old method was already adjusted if new method exists in _the_table
--            continue;
-+          if (_the_table->lookup(newer_method) != NULL) {
-+            // old method was already adjusted if new method exists in _the_table
-+              continue;
-+          }
-         }
- 
-         java_lang_invoke_ResolvedMethodName::set_vmtarget(mem_name, newer_method);
-@@ -428,7 +428,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
- 
-         ResourceMark rm;
-         if (!(*trace_name_printed)) {
--          log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
-+          log_debug(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name());
-            *trace_name_printed = true;
-         }
-         log_debug(redefine, class, update, constantpool)
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0008-AllowEnhancedClassRedefinition-is-false-disabled-by-.patch

@@ -1,26 +0,0 @@
-From 74de59c61db380a0e1c85686714bd9a3f1b29210 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Tue, 6 Oct 2020 22:15:31 +0200
-Subject: [PATCH 08/45] AllowEnhancedClassRedefinition is false (disabled) by
- default
-
----
- src/hotspot/share/runtime/globals.hpp | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
-index 845a39b0225..fb6d1667156 100644
---- a/src/hotspot/share/runtime/globals.hpp
-+++ b/src/hotspot/share/runtime/globals.hpp
-@@ -2088,7 +2088,7 @@ const intx ObjectAlignmentInBytes = 8;
-   develop(bool, TraceOptimizedUpcallStubs, false,                              \
-                 "Trace optimized upcall stub generation")                      \
-                                                                             \
--  product(bool, AllowEnhancedClassRedefinition, true,                       \
-+  product(bool, AllowEnhancedClassRedefinition, false,                      \
-              "Allow enhanced class redefinition beyond swapping method "    \
-              "bodies")
- 
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0009-Set-HOTSPOT_VM_DISTRO-Dynamic-Code-Evolution.patch

@@ -1,74 +0,0 @@
-From c00c2a58550ae33ab2c842b521bf3b73163a93a1 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Mon, 19 Oct 2020 20:00:04 +0200
-Subject: [PATCH 09/45] Set HOTSPOT_VM_DISTRO=Dynamic Code Evolution
-
----
- make/autoconf/version-numbers | 55 +++++++++++++++++++++++++++++++++++
- 1 file changed, 55 insertions(+)
- create mode 100644 make/autoconf/version-numbers
-
-diff --git a/make/autoconf/version-numbers b/make/autoconf/version-numbers
-new file mode 100644
-index 00000000000..df8025a2e84
---- /dev/null
-+++ b/make/autoconf/version-numbers
-@@ -0,0 +1,55 @@
-+#
-+# 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
-+# 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.
-+#
-+
-+# Default version, product, and vendor information to use,
-+# unless overridden by configure
-+
-+DEFAULT_VERSION_FEATURE=15
-+DEFAULT_VERSION_INTERIM=0
-+DEFAULT_VERSION_UPDATE=0
-+DEFAULT_VERSION_PATCH=0
-+DEFAULT_VERSION_EXTRA1=0
-+DEFAULT_VERSION_EXTRA2=0
-+DEFAULT_VERSION_EXTRA3=0
-+DEFAULT_VERSION_DATE=2020-09-15
-+DEFAULT_VERSION_CLASSFILE_MAJOR=59  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
-+DEFAULT_VERSION_CLASSFILE_MINOR=0
-+DEFAULT_ACCEPTABLE_BOOT_VERSIONS="14 15"
-+DEFAULT_JDK_SOURCE_TARGET_VERSION=15
-+DEFAULT_PROMOTED_VERSION_PRE=
-+
-+LAUNCHER_NAME=openjdk
-+PRODUCT_NAME=OpenJDK
-+PRODUCT_SUFFIX="Runtime Environment"
-+JDK_RC_PLATFORM_NAME=Platform
-+COMPANY_NAME=N/A
-+HOTSPOT_VM_DISTRO="Dynamic Code Evolution"
-+VENDOR_URL=https://openjdk.java.net/
-+VENDOR_URL_BUG=https://bugreport.java.com/bugreport/
-+VENDOR_URL_VM_BUG=https://bugreport.java.com/bugreport/crash.jsp
-+
-+# Might need better names for these
-+MACOSX_BUNDLE_NAME_BASE="OpenJDK"
-+MACOSX_BUNDLE_ID_BASE="net.java.openjdk"
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0010-Clear-dcevm-code-separation.patch

@@ -1,206 +0,0 @@
-From c04d57e5278aa5d3cb6ef53fc161d2b6b4f19f3c Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Fri, 23 Oct 2020 10:20:26 +0200
-Subject: [PATCH 10/45] Clear dcevm code separation
-
----
- src/hotspot/share/classfile/systemDictionary.cpp   |  3 +--
- src/hotspot/share/gc/serial/genMarkSweep.cpp       |  8 +++++---
- src/hotspot/share/interpreter/linkResolver.cpp     | 14 ++++++++++----
- .../instrumentation/jfrEventClassTransformer.cpp   |  2 +-
- src/hotspot/share/oops/cpCache.hpp                 |  8 +++++---
- src/hotspot/share/oops/instanceKlass.cpp           |  6 +++---
- src/hotspot/share/oops/method.cpp                  |  2 +-
- src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp  |  2 +-
- src/hotspot/share/runtime/reflection.cpp           |  2 +-
- 9 files changed, 28 insertions(+), 19 deletions(-)
-
-diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
-index cea614a574f..98e2541c79b 100644
---- a/src/hotspot/share/classfile/systemDictionary.cpp
-+++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -830,9 +830,8 @@ InstanceKlass* SystemDictionary::resolve_hidden_class_from_stream(
- 
-   EventClassLoad class_load_start_event;
-   ClassLoaderData* loader_data;
-- 
-+
-   bool is_redefining = (old_klass != NULL);
--  
- 
-   // - for hidden classes that are not strong: create a new CLD that has a class holder and
-   //                                           whose loader is the Lookup class's loader.
-diff --git a/src/hotspot/share/gc/serial/genMarkSweep.cpp b/src/hotspot/share/gc/serial/genMarkSweep.cpp
-index bbb2c02f2b2..00b8e44078e 100644
---- a/src/hotspot/share/gc/serial/genMarkSweep.cpp
-+++ b/src/hotspot/share/gc/serial/genMarkSweep.cpp
-@@ -316,7 +316,9 @@ void GenMarkSweep::mark_sweep_phase4() {
- 
-   GenCompactClosure blk;
-   gch->generation_iterate(&blk, true);
--  DcevmSharedGC::copy_rescued_objects_back(MarkSweep::_rescued_oops, true);
--  DcevmSharedGC::clear_rescued_objects_resource(MarkSweep::_rescued_oops);
--  MarkSweep::_rescued_oops = NULL;
-+  if (AllowEnhancedClassRedefinition) {
-+    DcevmSharedGC::copy_rescued_objects_back(MarkSweep::_rescued_oops, true);
-+    DcevmSharedGC::clear_rescued_objects_resource(MarkSweep::_rescued_oops);
-+    MarkSweep::_rescued_oops = NULL;
-+  }
- }
-diff --git a/src/hotspot/share/interpreter/linkResolver.cpp b/src/hotspot/share/interpreter/linkResolver.cpp
-index 8fb336762df..74a6af13ea4 100644
---- a/src/hotspot/share/interpreter/linkResolver.cpp
-+++ b/src/hotspot/share/interpreter/linkResolver.cpp
-@@ -287,9 +287,14 @@ void LinkResolver::check_klass_accessibility(Klass* ref_klass, Klass* sel_klass,
-   if (!base_klass->is_instance_klass()) {
-     return;  // no relevant check to do
-   }
--
-+  Klass* refKlassNewest = ref_klass;
-+  Klass* baseKlassNewest = base_klass;
-+  if (AllowEnhancedClassRedefinition) {
-+    refKlassNewest = ref_klass->newest_version();
-+    baseKlassNewest = base_klass->newest_version();
-+  }
-   Reflection::VerifyClassAccessResults vca_result =
--    Reflection::verify_class_access(ref_klass->newest_version(), InstanceKlass::cast(base_klass->newest_version()), true);
-+    Reflection::verify_class_access(refKlassNewest, InstanceKlass::cast(baseKlassNewest), true);
-   if (vca_result != Reflection::ACCESS_OK) {
-     ResourceMark rm(THREAD);
-     char* msg = Reflection::verify_class_access_msg(ref_klass,
-@@ -551,7 +556,8 @@ void LinkResolver::check_method_accessability(Klass* ref_klass,
-   // We'll check for the method name first, as that's most likely
-   // to be false (so we'll short-circuit out of these tests).
-   if (sel_method->name() == vmSymbols::clone_name() &&
--      sel_klass->newest_version() == vmClasses::Object_klass()->newest_version() &&
-+      ( !AllowEnhancedClassRedefinition && sel_klass == vmClasses::Object_klass() ||
-+      AllowEnhancedClassRedefinition && sel_klass->newest_version() == vmClasses::Object_klass()->newest_version()) &&
-       resolved_klass->is_array_klass()) {
-     // We need to change "protected" to "public".
-     assert(flags.is_protected(), "clone not protected?");
-@@ -997,7 +1003,7 @@ void LinkResolver::resolve_field(fieldDescriptor& fd,
-     //     or by the <init> method (in case of an instance field).
-     if (is_put && fd.access_flags().is_final()) {
- 
--      if (sel_klass != current_klass && sel_klass != current_klass->active_version()) {
-+      if (sel_klass != current_klass && (!AllowEnhancedClassRedefinition || sel_klass != current_klass->active_version())) {
-         ResourceMark rm(THREAD);
-         stringStream ss;
-         ss.print("Update to %s final field %s.%s attempted from a different class (%s) than the field's declaring class",
-diff --git a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
-index 88e520ec475..73832251f3f 100644
---- a/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
-+++ b/src/hotspot/share/jfr/instrumentation/jfrEventClassTransformer.cpp
-@@ -1475,7 +1475,7 @@ static InstanceKlass* create_new_instance_klass(InstanceKlass* ik, ClassFileStre
-                              cld,
-                              &cl_info,
-                              ClassFileParser::INTERNAL, // internal visibility
--							 false,
-+                             false,
-                              THREAD);
-   if (HAS_PENDING_EXCEPTION) {
-     log_pending_exception(PENDING_EXCEPTION);
-diff --git a/src/hotspot/share/oops/cpCache.hpp b/src/hotspot/share/oops/cpCache.hpp
-index b934302f422..d7ae5edc7b3 100644
---- a/src/hotspot/share/oops/cpCache.hpp
-+++ b/src/hotspot/share/oops/cpCache.hpp
-@@ -148,13 +148,13 @@ class ConstantPoolCacheEntry {
-   void set_bytecode_2(Bytecodes::Code code);
-   void set_f1(Metadata* f1) {
-     Metadata* existing_f1 = _f1; // read once
--    //assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
-+    assert(AllowEnhancedClassRedefinition || existing_f1 == NULL || existing_f1 == f1, "illegal field change");
-     _f1 = f1;
-   }
-   void release_set_f1(Metadata* f1);
-   void set_f2(intx f2) {
-     intx existing_f2 = _f2; // read once
--    //assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change");
-+    assert(AllowEnhancedClassRedefinition || existing_f2 == 0 || existing_f2 == f2, "illegal field change");
-     _f2 = f2;
-   }
-   void set_f2_as_vfinal_method(Method* f2) {
-@@ -215,7 +215,9 @@ class ConstantPoolCacheEntry {
-   void initialize_resolved_reference_index(int ref_index) {
-     assert(_f2 == 0, "set once");  // note: ref_index might be zero also
-     _f2 = ref_index;
--    _flags = 1 << is_resolved_ref_shift;
-+    if (AllowEnhancedClassRedefinition) {
-+      _flags = 1 << is_resolved_ref_shift;
-+    }
-   }
- 
-   void set_field(                                // sets entry to resolved field state
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index 6d9e5116df1..1e2b40dd1f2 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -968,7 +968,7 @@ bool InstanceKlass::link_class_impl(TRAPS) {
-         set_init_state(linked);
-       }
-       // (DCEVM) Must check for old version in order to prevent infinite loops.
--      if (JvmtiExport::should_post_class_prepare() && old_version() == NULL /* JVMTI deadlock otherwise */) {
-+      if (JvmtiExport::should_post_class_prepare()  && (!AllowEnhancedClassRedefinition || old_version() == NULL /* JVMTI deadlock otherwise */) {
-         JvmtiExport::post_class_prepare(THREAD, this);
-       }
-     }
-@@ -1046,7 +1046,7 @@ void InstanceKlass::initialize_impl(TRAPS) {
-     // we might end up throwing IE from link/symbol resolution sites
-     // that aren't expected to throw.  This would wreak havoc.  See 6320309.
-     while ((is_being_initialized() && !is_reentrant_initialization(jt))
--            || (old_version() != NULL && InstanceKlass::cast(old_version())->is_being_initialized())) {
-+            || (AllowEnhancedClassRedefinition && old_version() != NULL && InstanceKlass::cast(old_version())->is_being_initialized())) {
-       wait = true;
-       jt->set_class_to_be_initialized(this);
-       ol.wait_uninterruptibly(jt);
-@@ -3808,7 +3808,7 @@ void InstanceKlass::verify_on(outputStream* st) {
- 
-     guarantee(sib->is_klass(), "should be klass");
-     // TODO: (DCEVM) explain
--    guarantee(sib->super() == super || super->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
-+    guarantee(sib->super() == super || AllowEnhancedClassRedefinition && super->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
-   }
- 
-   // Verify local interfaces
-diff --git a/src/hotspot/share/oops/method.cpp b/src/hotspot/share/oops/method.cpp
-index a5a12599997..4426f03fd40 100644
---- a/src/hotspot/share/oops/method.cpp
-+++ b/src/hotspot/share/oops/method.cpp
-@@ -2199,7 +2199,7 @@ void Method::ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity) {
- // Add a method id to the jmethod_ids
- jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) {
-   // FIXME: (DCEVM) ???
--  if (m != m->newest_version()) {
-+  if (AllowEnhancedClassRedefinition && m != m->newest_version()) {
-     m = m->newest_version();
-   }
-   ClassLoaderData* cld = loader_data;
-diff --git a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-index 42e72c67879..c860ee24f80 100644
---- a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-@@ -76,7 +76,7 @@ public:
-     //         the new version (SystemDictionary stores only new versions). But the LoadedClassesClosure's functionality was
-     //         changed in java8  where jvmtiLoadedClasses collects all classes from all classloaders, therefore we
-     //         must use new versions only.
--    if (k->new_version()==NULL) {
-+    if (AllowEnhancedClassRedefinition && k->new_version()==NULL) {
-       _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, k->java_mirror())));
-       if (_dictionary_walk) {
-         // Collect array classes this way when walking the dictionary (because array classes are
-diff --git a/src/hotspot/share/runtime/reflection.cpp b/src/hotspot/share/runtime/reflection.cpp
-index cc58f913ed5..21104c18423 100644
---- a/src/hotspot/share/runtime/reflection.cpp
-+++ b/src/hotspot/share/runtime/reflection.cpp
-@@ -608,7 +608,7 @@ bool Reflection::verify_member_access(const Klass* current_class,
-                                       TRAPS) {
- 
-   // (DCEVM) Decide accessibility based on active version
--  if (current_class != NULL) {
-+  if (AllowEnhancedClassRedefinition && current_class != NULL) {
-     current_class = current_class->active_version();
-   }
- 
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0011-Fix-LoadedClassesClosure-fixes-problems-with-remote-.patch

@@ -1,26 +0,0 @@
-From 3e9df9bdd901f1a7f7af57f2d37a738c059e3bb3 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Wed, 11 Nov 2020 18:45:15 +0100
-Subject: [PATCH 11/45] 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 c860ee24f80..dfe0bb8d96a 100644
---- a/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiGetLoadedClasses.cpp
-@@ -76,7 +76,7 @@ public:
-     //         the new version (SystemDictionary stores only new versions). But the LoadedClassesClosure's functionality was
-     //         changed in java8  where jvmtiLoadedClasses collects all classes from all classloaders, therefore we
-     //         must use new versions only.
--    if (AllowEnhancedClassRedefinition && k->new_version()==NULL) {
-+    if (!AllowEnhancedClassRedefinition || k->new_version()==NULL) {
-       _classStack.push((jclass) _env->jni_reference(Handle(_cur_thread, k->java_mirror())));
-       if (_dictionary_walk) {
-         // Collect array classes this way when walking the dictionary (because array classes are
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0013-dcevm15-add-ClassLoaderDataGraph_lock-on.patch

@@ -1,43 +0,0 @@
-From 2a27d36f5fbb0ebd94da192355f3946138c495bd Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 22 Nov 2020 19:51:46 +0100
-Subject: [PATCH 13/45] dcevm15 - add ClassLoaderDataGraph_lock on
- ClassLoaderDataGraph::classes_do
-
-ClassLoaderDataGraph::classes_do and need safepoint or lock,
-find_sorted_affected_classes is not in safepoint therefore it must be
-locked
-ClassLoaderDataGraph::rollback_redefinition need safepoint too
----
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 7 ++++++-
- 1 file changed, 6 insertions(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index a27c2ff87ae..001d2c782d8 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -1380,7 +1380,9 @@ void VM_EnhancedRedefineClasses::calculate_instance_update_information(Klass* ne
- // Rollback all changes - clear new classes from the system dictionary, return old classes to directory, free memory.
- void VM_EnhancedRedefineClasses::rollback() {
-   log_info(redefine, class, load)("Rolling back redefinition, result=%d", _res);
-+  ClassLoaderDataGraph_lock->lock();
-   ClassLoaderDataGraph::rollback_redefinition();
-+  ClassLoaderDataGraph_lock->unlock();
- 
-   for (int i = 0; i < _new_classes->length(); i++) {
-     SystemDictionary::remove_from_hierarchy(_new_classes->at(i));
-@@ -2063,7 +2065,10 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
-   AffectedKlassClosure closure(_affected_klasses);
-   // Updated in j10, from original SystemDictionary::classes_do
- 
--  ClassLoaderDataGraph::classes_do(&closure);
-+  {
-+    MutexLocker mcld(ClassLoaderDataGraph_lock);
-+    ClassLoaderDataGraph::classes_do(&closure);
-+  }
-   //ClassLoaderDataGraph::dictionary_classes_do(&closure);
- 
-   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0014-dcevm15-fix-Universe-root_oops_do.patch

@@ -1,98 +0,0 @@
-From 09af8da3c8fcb6d97917951673a56696fd7d6a2b Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 22 Nov 2020 12:05:50 +0100
-Subject: [PATCH 14/45] dcevm15 - fix Universe::root_oops_do
-
-Removed ClassLoaderDataGraph::cld_do was cause of crashes due multiple
-oop patching. ClassLoaderDataGraph::cld_do replaced in dcevm15
-previously used and removed SystemDictionary:oops_do
----
- src/hotspot/share/memory/universe.cpp | 45 +++++++++++----------------
- 1 file changed, 19 insertions(+), 26 deletions(-)
-
-diff --git a/src/hotspot/share/memory/universe.cpp b/src/hotspot/share/memory/universe.cpp
-index 9fcbb6c41b3..247f2b3e8c0 100644
---- a/src/hotspot/share/memory/universe.cpp
-+++ b/src/hotspot/share/memory/universe.cpp
-@@ -44,6 +44,8 @@
- #include "gc/shared/oopStorageSet.hpp"
- #include "gc/shared/stringdedup/stringDedup.hpp"
- #include "gc/shared/tlab_globals.hpp"
-+#include "gc/shared/weakProcessor.hpp"
-+#include "interpreter/interpreter.hpp"
- #include "logging/log.hpp"
- #include "logging/logStream.hpp"
- #include "memory/metadataFactory.hpp"
-@@ -71,6 +73,8 @@
- #include "runtime/jniHandles.hpp"
- #include "runtime/thread.inline.hpp"
- #include "runtime/timerTrace.hpp"
-+#include "runtime/vmOperations.hpp"
-+#include "services/management.hpp"
- #include "services/memoryService.hpp"
- #include "utilities/align.hpp"
- #include "utilities/autoRestore.hpp"
-@@ -209,45 +213,34 @@ void Universe::basic_type_classes_do(KlassClosure *closure) {
- 
- // FIXME: (DCEVM) This method should iterate all pointers that are not within heap objects.
- void Universe::root_oops_do(OopClosure *oopClosure) {
--
--  class AlwaysTrueClosure: public BoolObjectClosure {
--  public:
--    void do_object(oop p) { ShouldNotReachHere(); }
--    bool do_object_b(oop p) { return true; }
--  };
--  AlwaysTrueClosure always_true;
--
-   Universe::oops_do(oopClosure);
- //  ReferenceProcessor::oops_do(oopClosure); (tw) check why no longer there
-   JNIHandles::oops_do(oopClosure);   // Global (strong) JNI handles
-   Threads::oops_do(oopClosure, NULL);
-   ObjectSynchronizer::oops_do(oopClosure);
--  // TODO: review, flat profiler was removed in j10
--  // FlatProfiler::oops_do(oopClosure);
--  JvmtiExport::oops_do(oopClosure);
-+  // (DCEVM) TODO: Check if this is correct?
-+  Management::oops_do(oopClosure);
-+  OopStorageSet::vm_global()->oops_do(oopClosure);
-+  // CLDToOopClosure cld_closure(oopClosure, ClassLoaderData::_claim_none);
-+  // ClassLoaderDataGraph::cld_do(&cld_closure);
- 
-   // Now adjust pointers in remaining weak roots.  (All of which should
-   // have been cleared if they pointed to non-surviving objects.)
-   // Global (weak) JNI handles
--  JNIHandles::weak_oops_do(&always_true, oopClosure);
-+  WeakProcessor::oops_do(oopClosure);
-+
-+  JvmtiExport::oops_do(oopClosure);
- 
-   CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
-   CodeCache::blobs_do(&blobClosure);
--  StringTable::oops_do(oopClosure);
-+  
-+  AOT_ONLY(AOTLoader::oops_do(oopClosure);)
-+  
-+  // StringTable::oops_do was removed in j15
-+  // StringTable::oops_do(oopClosure);
-+
-+  // OopStorageSet::vm_global()->oops_do(oopClosure);
- 
--  // (DCEVM) TODO: Check if this is correct?
--  //CodeCache::scavenge_root_nmethods_oops_do(oopClosure);
--  //Management::oops_do(oopClosure);
--  //ref_processor()->weak_oops_do(&oopClosure);
--  //PSScavenge::reference_processor()->weak_oops_do(&oopClosure);
--
--#if INCLUDE_AOT
--  if (UseAOT) {
--    AOTLoader::oops_do(oopClosure);
--  }
--#endif
--  // SO_AllClasses
--  SystemDictionary::oops_do(oopClosure);
- }
- 
- void Universe::oops_do(OopClosure* f) {
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0015-dcevm15-check-if-has_nestmate_access_to-has-newest-h.patch

@@ -1,29 +0,0 @@
-From fc0d2894212fd2186498d3341dddf2f201965686 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 28 Nov 2020 19:29:42 +0100
-Subject: [PATCH 15/45] dcevm15 - check if has_nestmate_access_to has newest
- host class
-
----
- src/hotspot/share/oops/instanceKlass.cpp | 5 +++++
- 1 file changed, 5 insertions(+)
-
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index c181fe044e2..a8ac12450d7 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -398,6 +398,11 @@ bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
-     return false;
-   }
- 
-+  if (AllowEnhancedClassRedefinition) {
-+    // TODO: (DCEVM) check if it correct. It fix problems with lambdas (hidden)
-+    cur_host = InstanceKlass::cast(cur_host->newest_version());
-+  }
-+
-   Klass* k_nest_host = k->nest_host(CHECK_false);
-   if (k_nest_host == NULL) {
-     return false;
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0016-dcevm15-mark_as_scavengable-only-alive-methods.patch

@@ -1,54 +0,0 @@
-From d20a52a5e7a87003da6f3e4bda39ec2976868a75 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 29 Nov 2020 17:18:16 +0100
-Subject: [PATCH 16/45] dcevm15 - mark_as_scavengable only alive methods
-
----
- .../share/prims/jvmtiEnhancedRedefineClasses.cpp   | 14 ++++++++------
- 1 file changed, 8 insertions(+), 6 deletions(-)
-
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 001d2c782d8..d742679d199 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -223,19 +223,21 @@ class FieldCopier : public FieldClosure {
- 
- // TODO: review...
- void VM_EnhancedRedefineClasses::mark_as_scavengable(nmethod* nm) {
--  ScavengableNMethods::register_nmethod(nm);
-+  if (nm->is_alive()) {
-+    ScavengableNMethods::register_nmethod(nm);
-+  }
- }
- 
- void VM_EnhancedRedefineClasses::unregister_nmethod_g1(nmethod* nm) {
-   // It should work not only for G1 but also for another GCs, but this way is safer now
--  if (!nm->is_zombie() && !nm->is_unloaded()) {
-+  if (nm->is_alive()) {
-     Universe::heap()->unregister_nmethod(nm);
-   }
- }
- 
- void VM_EnhancedRedefineClasses::register_nmethod_g1(nmethod* nm) {
-   // It should work not only for G1 but also for another GCs, but this way is safer now
--  if (!nm->is_zombie() && !nm->is_unloaded()) {
-+  if (nm->is_alive()) {
-     Universe::heap()->register_nmethod(nm);
-   }
- }
-@@ -511,9 +513,9 @@ void VM_EnhancedRedefineClasses::doit() {
-     flush_dependent_code(thread);
-   // }
- 
--    // Adjust constantpool caches for all classes that reference methods of the evolved class.
--    ClearCpoolCacheAndUnpatch clear_cpool_cache(thread);
--    ClassLoaderDataGraph::classes_do(&clear_cpool_cache);
-+  // Adjust constantpool caches for all classes that reference methods of the evolved class.
-+  ClearCpoolCacheAndUnpatch clear_cpool_cache(thread);
-+  ClassLoaderDataGraph::classes_do(&clear_cpool_cache);
- 
-   // JSR-292 support
-   if (_any_class_has_resolved_methods) {
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0017-dcevm15-fix-hidded-classes.patch

@@ -1,91 +0,0 @@
-From b315e7cd828e79d63562b0296b97795015b644af Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 29 Nov 2020 20:05:03 +0100
-Subject: [PATCH 17/45] dcevm15 - fix hidded classes
-
----
- .../prims/jvmtiEnhancedRedefineClasses.cpp    | 41 ++++++++++++++-----
- 1 file changed, 30 insertions(+), 11 deletions(-)
-
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index d742679d199..1433e429e30 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -722,7 +722,8 @@ bool VM_EnhancedRedefineClasses::is_modifiable_class(oop klass_mirror) {
-   }
- 
-   // Cannot redefine or retransform an anonymous class.
--  if (InstanceKlass::cast(k)->is_unsafe_anonymous()) {
-+  // TODO: check if is correct in j15
-+  if (InstanceKlass::cast(k)->is_unsafe_anonymous() || InstanceKlass::cast(k)->is_hidden()) {
-     return false;
-   }
-   return true;
-@@ -808,21 +809,27 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
- 
-     InstanceKlass* k;
- 
--    if (InstanceKlass::cast(the_class)->is_unsafe_anonymous()) {
--      const InstanceKlass* host_class = the_class->unsafe_anonymous_host();
-+    if (the_class->is_unsafe_anonymous() || the_class->is_hidden()) {
-+      InstanceKlass* dynamic_host_class = NULL;
-+      InstanceKlass* unsafe_anonymous_host = NULL;
- 
--      // Make sure it's the real host class, not another anonymous class.
--      while (host_class != NULL && host_class->is_unsafe_anonymous()) {
--        host_class = host_class->unsafe_anonymous_host();
-+      if (the_class->is_hidden()) {
-+        log_debug(redefine, class, load)("loading hidden class %s", the_class->name()->as_C_string());
-+        dynamic_host_class = the_class->nest_host(THREAD);
-+      }
-+
-+      if (the_class->is_unsafe_anonymous()) {
-+        log_debug(redefine, class, load)("loading usafe anonymous %s", the_class->name()->as_C_string());
-+        unsafe_anonymous_host = the_class->unsafe_anonymous_host();
-       }
- 
-       ClassLoadInfo cl_info(protection_domain,
--                            host_class,
--                            NULL,     // dynamic_nest_host
-+                            unsafe_anonymous_host,
-                             NULL,     // cp_patches
-+                            dynamic_host_class,     // dynamic_nest_host
-                             Handle(), // classData
--                            false,    // is_hidden
--                            false,    // is_strong_hidden
-+                            the_class->is_hidden(),    // is_hidden
-+                            !the_class->is_non_strong_hidden(),    // is_strong_hidden
-                             true);    // FIXME: check if correct. can_access_vm_annotations
- 
-       k = SystemDictionary::parse_stream(the_class_sym,
-@@ -833,7 +840,17 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
-                                          THREAD);
- 
-       k->class_loader_data()->exchange_holders(the_class->class_loader_data());
--      the_class->class_loader_data()->inc_keep_alive();
-+
-+      if (the_class->is_hidden()) {
-+      // from jvm_lookup_define_class() (jvm.cpp):
-+      // The hidden class loader data has been artificially been kept alive to
-+      // this point. The mirror and any instances of this class have to keep
-+      // it alive afterwards.
-+        the_class->class_loader_data()->dec_keep_alive();
-+      } else {
-+        the_class->class_loader_data()->inc_keep_alive();
-+      }
-+
-     } else {
-       k = SystemDictionary::resolve_from_stream(the_class_sym,
-                                                   the_class_loader,
-@@ -1475,6 +1492,8 @@ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
-     ik->set_unsafe_anonymous_host(InstanceKlass::cast(ik->unsafe_anonymous_host()->newest_version()));
-   }
- 
-+  // FIXME: check new nest_host for hidden
-+
-   // Update implementor if there is only one, in this case implementor() can reference old class
-   if (ik->is_interface()) {
-     Klass* implKlass = ik->implementor();
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0018-dcevm15-DON-T-clear-F2-in-CP-cache-after-indy-unevol.patch

@@ -1,27 +0,0 @@
-From 25d78e62a702ad754c1a3a0136db1453089f008e Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 29 Nov 2020 20:08:57 +0100
-Subject: [PATCH 18/45] dcevm15 - DON'T clear F2 in CP cache after indy
- unevolving
-
-It's not clear why it was cleared in dcevm7-11
----
- src/hotspot/share/oops/cpCache.cpp | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/oops/cpCache.cpp b/src/hotspot/share/oops/cpCache.cpp
-index 167cb274661..7e72641ec5a 100644
---- a/src/hotspot/share/oops/cpCache.cpp
-+++ b/src/hotspot/share/oops/cpCache.cpp
-@@ -654,7 +654,7 @@ void ConstantPoolCacheEntry::clear_entry() {
- 
-   if (clearData) {
-     if (!is_resolved_reference()) {
--      _f2 = 0;
-+      // _f2 = 0;
-     }
-     // FIXME: (DCEVM) we want to clear flags, but parameter size is actually used
-     // after we return from the method, before entry is re-initialized. So let's
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0019-Cleanup-and-review-comments.patch

@@ -1,66 +0,0 @@
-From b84814b31883b0f5441fca6d77b18c7426d26c36 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 22 Nov 2020 12:03:32 +0100
-Subject: [PATCH 19/45] Cleanup and review comments
-
----
- src/hotspot/share/classfile/classLoaderDataGraph.hpp     | 2 +-
- src/hotspot/share/gc/shared/gcConfig.cpp                 | 2 +-
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 1 +
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp | 2 +-
- 4 files changed, 4 insertions(+), 3 deletions(-)
-
-diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.hpp b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-index 5f8913001b0..c3bcc7271e6 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-@@ -105,7 +105,7 @@ class ClassLoaderDataGraph : public AllStatic {
- 
-   static void dictionary_classes_do(KlassClosure* klass_closure);
- 
--  // Enhanced class redefinition
-+  // (DCEVM) Enhanced class redefinition
-   static void rollback_redefinition();
- 
-   // VM_CounterDecay iteration support
-diff --git a/src/hotspot/share/gc/shared/gcConfig.cpp b/src/hotspot/share/gc/shared/gcConfig.cpp
-index 26a2b67b8e9..8e78696bef5 100644
---- a/src/hotspot/share/gc/shared/gcConfig.cpp
-+++ b/src/hotspot/share/gc/shared/gcConfig.cpp
-@@ -97,7 +97,7 @@ void GCConfig::fail_if_non_included_gc_is_selected() {
- 
- void GCConfig::select_gc_ergonomically() {
-   if (AllowEnhancedClassRedefinition && !UseG1GC) {
--    // Enhanced class redefinition only supports serial GC at the moment
-+    // (DCEVM) Enhanced class redefinition only supports serial GC at the moment
-     FLAG_SET_ERGO(UseSerialGC, true);
-   } else if (os::is_server_class_machine()) {
- #if INCLUDE_G1GC
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 1433e429e30..af34d751bdb 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -842,6 +842,7 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
-       k->class_loader_data()->exchange_holders(the_class->class_loader_data());
- 
-       if (the_class->is_hidden()) {
-+      // TODO: (DCEVM) review if is correct
-       // from jvm_lookup_define_class() (jvm.cpp):
-       // The hidden class loader data has been artificially been kept alive to
-       // this point. The mirror and any instances of this class have to keep
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-index 61f62e7f831..43f1aff8e91 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-@@ -78,7 +78,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
-   // have any entries.
-   bool _any_class_has_resolved_methods;
- 
--  // Enhanced class redefinition, affected klasses contain all classes which should be redefined
-+  // (DCEVM) Enhanced class redefinition, affected klasses contain all classes which should be redefined
-   // either because of redefine, class hierarchy or interface change
-   GrowableArray<Klass*>*      _affected_klasses;
- 
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0020-Disable-AllowEnhancedClassRedefinition-in-flight-rec.patch

@@ -1,31 +0,0 @@
-From 9da70fec073a442e9c0aee19a5ec643c1f84cea5 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Fri, 12 Feb 2021 10:11:10 +0100
-Subject: [PATCH 20/45] 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 9661f2b62b9..252ebbc4e57 100644
---- a/src/hotspot/share/runtime/arguments.cpp
-+++ b/src/hotspot/share/runtime/arguments.cpp
-@@ -4027,6 +4027,13 @@ 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;
-+    }
-+  }
-+
- #if !INCLUDE_CDS
-   if (DumpSharedSpaces || RequireSharedSpaces) {
-     jio_fprintf(defaultStream::error_stream(),
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0021-dcevm17-fix-compilation-issues.patch

@@ -1,695 +0,0 @@
-From 5d065e823c431a80251696c2543f6c98e68f00a6 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Fri, 12 Feb 2021 09:44:28 +0100
-Subject: [PATCH 21/45] dcevm17 - fix compilation issues
-
----
- .../share/classfile/classLoaderData.cpp       |   2 +-
- src/hotspot/share/classfile/javaClasses.cpp   |   4 +-
- src/hotspot/share/classfile/javaClasses.hpp   |   4 +-
- .../share/classfile/lambdaFormInvokers.cpp    | 152 ++++++++++++++++++
- .../share/classfile/systemDictionary.cpp      |   5 +-
- .../share/classfile/systemDictionary.hpp      |   6 +
- src/hotspot/share/classfile/vmClassMacros.hpp |   2 +
- .../share/gc/g1/g1FullGCCompactTask.cpp       |   9 +-
- .../share/gc/g1/g1FullGCCompactionPoint.cpp   |  12 +-
- src/hotspot/share/gc/shared/dcevmSharedGC.cpp |   2 +-
- src/hotspot/share/gc/shared/space.inline.hpp  |   2 +-
- src/hotspot/share/memory/universe.cpp         |  71 --------
- src/hotspot/share/memory/universe.hpp         |   7 -
- src/hotspot/share/oops/instanceKlass.cpp      |   4 +-
- .../prims/jvmtiEnhancedRedefineClasses.cpp    |  47 ++++--
- .../prims/jvmtiEnhancedRedefineClasses.hpp    |   2 +
- .../share/prims/resolvedMethodTable.cpp       |   5 +-
- src/hotspot/share/runtime/arguments.hpp       |   2 +
- 18 files changed, 221 insertions(+), 117 deletions(-)
- create mode 100644 src/hotspot/share/classfile/lambdaFormInvokers.cpp
-
-diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
-index 2a826ff50a7..65ce4c4af8c 100644
---- a/src/hotspot/share/classfile/classLoaderData.cpp
-+++ b/src/hotspot/share/classfile/classLoaderData.cpp
-@@ -603,7 +603,7 @@ void ClassLoaderData::exchange_holders(ClassLoaderData* cld) {
-   oop holder_oop = _holder.peek();
-   _holder.replace(cld->_holder.peek());
-   cld->_holder.replace(holder_oop);
--  WeakHandle<vm_weak_data> exchange = _holder;
-+  WeakHandle exchange = _holder;
-   _holder = cld->_holder;
-   cld->_holder = exchange;
- }
-diff --git a/src/hotspot/share/classfile/javaClasses.cpp b/src/hotspot/share/classfile/javaClasses.cpp
-index dc800debea4..66ff72b2f02 100644
---- a/src/hotspot/share/classfile/javaClasses.cpp
-+++ b/src/hotspot/share/classfile/javaClasses.cpp
-@@ -3827,7 +3827,7 @@ void java_lang_invoke_DirectMethodHandle_StaticAccessor::set_static_offset(oop d
-   macro(_static_offset_offset, k, vmSymbols::static_offset_name(), long_signature, false)
- 
- void java_lang_invoke_DirectMethodHandle_StaticAccessor::compute_offsets() {
--  InstanceKlass* k = SystemDictionary::DirectMethodHandle_StaticAccessor_klass();
-+  InstanceKlass* k = vmClasses::DirectMethodHandle_StaticAccessor_klass();
-   DIRECTMETHODHANDLE_STATIC_ACCESSOR_FIELDS_DO(FIELD_COMPUTE_OFFSET);
- }
- 
-@@ -3855,7 +3855,7 @@ void java_lang_invoke_DirectMethodHandle_Accessor::set_field_offset(oop dmh, int
-   macro(_field_offset_offset, k, vmSymbols::field_offset_name(), int_signature, false)
- 
- void java_lang_invoke_DirectMethodHandle_Accessor::compute_offsets() {
--  InstanceKlass* k = SystemDictionary::DirectMethodHandle_Accessor_klass();
-+  InstanceKlass* k = vmClasses::DirectMethodHandle_Accessor_klass();
-   DIRECTMETHODHANDLE_ACCESSOR_FIELDS_DO(FIELD_COMPUTE_OFFSET);
- }
- 
-diff --git a/src/hotspot/share/classfile/javaClasses.hpp b/src/hotspot/share/classfile/javaClasses.hpp
-index 32348c90ef9..f7dc5ccbd8c 100644
---- a/src/hotspot/share/classfile/javaClasses.hpp
-+++ b/src/hotspot/share/classfile/javaClasses.hpp
-@@ -1029,7 +1029,7 @@ class java_lang_invoke_DirectMethodHandle_StaticAccessor: AllStatic {
- 
-   // Testers
-   static bool is_subclass(Klass* klass) {
--    return klass->is_subclass_of(SystemDictionary::DirectMethodHandle_StaticAccessor_klass());
-+    return klass->is_subclass_of(vmClasses::DirectMethodHandle_StaticAccessor_klass());
-   }
-   static bool is_instance(oop obj);
- 
-@@ -1053,7 +1053,7 @@ class java_lang_invoke_DirectMethodHandle_Accessor: AllStatic {
- 
-   // Testers
-   static bool is_subclass(Klass* klass) {
--    return klass->is_subclass_of(SystemDictionary::DirectMethodHandle_Accessor_klass());
-+    return klass->is_subclass_of(vmClasses::DirectMethodHandle_Accessor_klass());
-   }
-   static bool is_instance(oop obj);
- 
-diff --git a/src/hotspot/share/classfile/lambdaFormInvokers.cpp b/src/hotspot/share/classfile/lambdaFormInvokers.cpp
-new file mode 100644
-index 00000000000..281de58b482
---- /dev/null
-+++ b/src/hotspot/share/classfile/lambdaFormInvokers.cpp
-@@ -0,0 +1,152 @@
-+/*
-+ * 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.
-+ *
-+ * 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.
-+ *
-+ */
-+
-+#include "precompiled.hpp"
-+#include "classfile/classLoadInfo.hpp"
-+#include "classfile/classFileStream.hpp"
-+#include "classfile/javaClasses.inline.hpp"
-+#include "classfile/klassFactory.hpp"
-+#include "classfile/lambdaFormInvokers.hpp"
-+#include "classfile/symbolTable.hpp"
-+#include "classfile/systemDictionary.hpp"
-+#include "classfile/systemDictionaryShared.hpp"
-+#include "classfile/vmClasses.hpp"
-+#include "classfile/vmSymbols.hpp"
-+#include "logging/log.hpp"
-+#include "memory/oopFactory.hpp"
-+#include "memory/metaspaceShared.hpp"
-+#include "memory/resourceArea.hpp"
-+#include "oops/instanceKlass.hpp"
-+#include "oops/klass.hpp"
-+#include "oops/objArrayKlass.hpp"
-+#include "oops/objArrayOop.hpp"
-+#include "oops/oop.inline.hpp"
-+#include "oops/typeArrayOop.inline.hpp"
-+#include "runtime/handles.inline.hpp"
-+#include "runtime/javaCalls.hpp"
-+
-+GrowableArray<char*>* LambdaFormInvokers::_lambdaform_lines = NULL;
-+
-+void LambdaFormInvokers::append(char* line) {
-+  if (_lambdaform_lines == NULL) {
-+    _lambdaform_lines = new GrowableArray<char*>(100);
-+  }
-+  _lambdaform_lines->append(line);
-+}
-+
-+void LambdaFormInvokers::regenerate_holder_classes(TRAPS) {
-+  assert(_lambdaform_lines != NULL, "Bad List");
-+  ResourceMark rm(THREAD);
-+
-+  Symbol* cds_name  = vmSymbols::jdk_internal_misc_CDS();
-+  Klass*  cds_klass = SystemDictionary::resolve_or_null(cds_name, THREAD);
-+  guarantee(cds_klass != NULL, "jdk/internal/misc/CDS must exist!");
-+
-+  int len = _lambdaform_lines->length();
-+  objArrayHandle list_lines = oopFactory::new_objArray_handle(vmClasses::String_klass(), len, CHECK);
-+  for (int i = 0; i < len; i++) {
-+    Handle h_line = java_lang_String::create_from_str(_lambdaform_lines->at(i), CHECK);
-+    list_lines->obj_at_put(i, h_line());
-+  }
-+
-+  //
-+  // Object[] CDS.generateLambdaFormHolderClasses(String[] lines)
-+  // the returned Object[] layout:
-+  //   name, byte[], name, byte[] ....
-+  Symbol* method = vmSymbols::generateLambdaFormHolderClasses();
-+  Symbol* signrs = vmSymbols::generateLambdaFormHolderClasses_signature();
-+
-+  JavaValue result(T_OBJECT);
-+  JavaCalls::call_static(&result, cds_klass, method, signrs, list_lines, THREAD);
-+
-+  if (HAS_PENDING_EXCEPTION) {
-+    log_info(cds)("%s: %s", THREAD->pending_exception()->klass()->external_name(),
-+                            java_lang_String::as_utf8_string(java_lang_Throwable::message(THREAD->pending_exception())));
-+    CLEAR_PENDING_EXCEPTION;
-+    return;
-+  }
-+
-+  objArrayHandle h_array(THREAD, (objArrayOop)result.get_oop());
-+  int sz = h_array->length();
-+  assert(sz % 2 == 0 && sz >= 2, "Must be even size of length");
-+  for (int i = 0; i < sz; i+= 2) {
-+    Handle h_name(THREAD, h_array->obj_at(i));
-+    typeArrayHandle h_bytes(THREAD, (typeArrayOop)h_array->obj_at(i+1));
-+    assert(h_name != NULL, "Class name is NULL");
-+    assert(h_bytes != NULL, "Class bytes is NULL");
-+
-+    char *class_name = java_lang_String::as_utf8_string(h_name());
-+    int len = h_bytes->length();
-+    // make a copy of class bytes so GC will not affect us.
-+    char *buf = resource_allocate_bytes(THREAD, len);
-+    memcpy(buf, (char*)h_bytes->byte_at_addr(0), len);
-+    ClassFileStream st((u1*)buf, len, NULL, ClassFileStream::verify);
-+
-+    reload_class(class_name, st, THREAD);
-+    // free buf
-+    resource_free_bytes(buf, len);
-+
-+    if (HAS_PENDING_EXCEPTION) {
-+      log_info(cds)("Exception happened: %s", PENDING_EXCEPTION->klass()->name()->as_C_string());
-+      log_info(cds)("Could not create InstanceKlass for class %s", class_name);
-+      CLEAR_PENDING_EXCEPTION;
-+      return;
-+    }
-+  }
-+}
-+
-+// class_handle - the class name, bytes_handle - the class bytes
-+void LambdaFormInvokers::reload_class(char* name, ClassFileStream& st, TRAPS) {
-+  Symbol* class_name = SymbolTable::new_symbol((const char*)name);
-+  // the class must exist
-+  Klass* klass = SystemDictionary::resolve_or_null(class_name, THREAD);
-+  if (klass == NULL) {
-+    log_info(cds)("Class %s not present, skip", name);
-+    return;
-+  }
-+  assert(klass->is_instance_klass(), "Should be");
-+
-+  ClassLoaderData* cld = ClassLoaderData::the_null_class_loader_data();
-+  Handle protection_domain;
-+  ClassLoadInfo cl_info(protection_domain);
-+
-+  InstanceKlass* result = KlassFactory::create_from_stream(&st,
-+                                                   class_name,
-+                                                   cld,
-+                                                   cl_info,
-+                                                   false,
-+                                                   CHECK);
-+
-+  {
-+    MutexLocker mu_r(THREAD, Compile_lock); // add_to_hierarchy asserts this.
-+    SystemDictionary::add_to_hierarchy(result);
-+  }
-+  // new class not linked yet.
-+  MetaspaceShared::try_link_class(THREAD, result);
-+  assert(!HAS_PENDING_EXCEPTION, "Invariant");
-+
-+  // exclude the existing class from dump
-+  SystemDictionaryShared::set_excluded(InstanceKlass::cast(klass));
-+  log_info(cds, lambda)("Replaced class %s, old: %p  new: %p", name, klass, result);
-+}
-diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
-index 98e2541c79b..63de2e2f099 100644
---- a/src/hotspot/share/classfile/systemDictionary.cpp
-+++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -963,11 +963,12 @@ InstanceKlass* SystemDictionary::resolve_from_stream(ClassFileStream* st,
-                                                      Symbol* class_name,
-                                                      Handle class_loader,
-                                                      const ClassLoadInfo& cl_info,
-+                                                     InstanceKlass* old_klass,
-                                                      TRAPS) {
-   if (cl_info.is_hidden()) {
--    return resolve_hidden_class_from_stream(st, class_name, class_loader, cl_info, CHECK_NULL);
-+    return resolve_hidden_class_from_stream(st, class_name, class_loader, cl_info, old_klass, CHECK_NULL);
-   } else {
--    return resolve_class_from_stream(st, class_name, class_loader, cl_info, CHECK_NULL);
-+    return resolve_class_from_stream(st, class_name, class_loader, cl_info, old_klass, CHECK_NULL);
-   }
- }
- 
-diff --git a/src/hotspot/share/classfile/systemDictionary.hpp b/src/hotspot/share/classfile/systemDictionary.hpp
-index 0c774dfeb51..65185a29b10 100644
---- a/src/hotspot/share/classfile/systemDictionary.hpp
-+++ b/src/hotspot/share/classfile/systemDictionary.hpp
-@@ -124,6 +124,7 @@ class SystemDictionary : AllStatic {
-                                                          Symbol* class_name,
-                                                          Handle class_loader,
-                                                          const ClassLoadInfo& cl_info,
-+                                                         InstanceKlass* old_klass,
-                                                          TRAPS);
- 
-   // Resolve a class from stream (called by jni_DefineClass and JVM_DefineClass)
-@@ -132,6 +133,7 @@ class SystemDictionary : AllStatic {
-                                                   Symbol* class_name,
-                                                   Handle class_loader,
-                                                   const ClassLoadInfo& cl_info,
-+                                                  InstanceKlass* old_klass,
-                                                   TRAPS);
- 
-  public:
-@@ -203,6 +205,10 @@ class SystemDictionary : AllStatic {
-   // Initialization
-   static void initialize(TRAPS);
- 
-+  // (DCEVM) Enhanced class redefinition
-+  static void remove_from_hierarchy(InstanceKlass* k);
-+  static void update_constraints_after_redefinition();
-+
- protected:
-   // Returns the class loader data to be used when looking up/updating the
-   // system dictionary.
-diff --git a/src/hotspot/share/classfile/vmClassMacros.hpp b/src/hotspot/share/classfile/vmClassMacros.hpp
-index a4f55641b51..fb205721a39 100644
---- a/src/hotspot/share/classfile/vmClassMacros.hpp
-+++ b/src/hotspot/share/classfile/vmClassMacros.hpp
-@@ -109,6 +109,8 @@
-                                                                                                                 \
-   /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */                                   \
-   do_klass(DirectMethodHandle_klass,                    java_lang_invoke_DirectMethodHandle                   ) \
-+  do_klass(DirectMethodHandle_StaticAccessor_klass,     java_lang_invoke_DirectMethodHandle_StaticAccessor    ) \
-+  do_klass(DirectMethodHandle_Accessor_klass,           java_lang_invoke_DirectMethodHandle_Accessor          ) \
-   do_klass(MethodHandle_klass,                          java_lang_invoke_MethodHandle                         ) \
-   do_klass(VarHandle_klass,                             java_lang_invoke_VarHandle                            ) \
-   do_klass(MemberName_klass,                            java_lang_invoke_MemberName                           ) \
-diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-index 54edc9dffb5..058dea90828 100644
---- a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-@@ -141,7 +141,10 @@ void G1FullGCCompactTask::compact_region_dcevm(HeapRegion* hr, GrowableArray<Hea
-   // Once all objects have been moved the liveness information
-   // needs be cleared.
-   collector()->mark_bitmap()->clear_region(hr);
--  hr->complete_compaction();
-+  if (G1VerifyBitmaps) {
-+    collector()->mark_bitmap()->clear_region(hr);
-+  }
-+  hr->reset_compacted_after_full_gc();
- }
- 
- void G1FullGCCompactTask::serial_compaction_dcevm() {
-@@ -184,13 +187,13 @@ size_t G1FullGCCompactTask::G1CompactRegionClosureDcevm::apply(oop obj) {
-     } else {
-       DcevmSharedGC::update_fields(obj, oop(destination));
-     }
--    oop(destination)->init_mark_raw();
-+    oop(destination)->init_mark();
-     assert(oop(destination)->klass() != NULL, "should have a class");
-     return size;
-   }
- 
-   Copy::aligned_conjoint_words(obj_addr, destination, size);
--  oop(destination)->init_mark_raw();
-+  oop(destination)->init_mark();
-   assert(oop(destination)->klass() != NULL, "should have a class");
- 
-   return size;
-diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
-index 71a46b88f9e..87b1977128a 100644
---- a/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
-@@ -36,8 +36,8 @@ G1FullGCCompactionPoint::G1FullGCCompactionPoint() :
- {
-   _compaction_regions = new (ResourceObj::C_HEAP, mtGC) GrowableArray<HeapRegion*>(32, mtGC);
-   _compaction_region_iterator = _compaction_regions->begin();
--  _rescued_oops = new (ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(128, true, mtGC);
--  _rescued_oops_values = new (ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(128, true, mtGC);
-+  _rescued_oops = new (ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(128, mtGC);
-+  _rescued_oops_values = new (ResourceObj::C_HEAP, mtGC) GrowableArray<HeapWord*>(128, mtGC);
- }
- 
- G1FullGCCompactionPoint::~G1FullGCCompactionPoint() {
-@@ -180,15 +180,15 @@ void G1FullGCCompactionPoint::forward_dcevm(oop object, size_t size, bool force_
-       // with BiasedLocking, in this case forwardee() will return NULL
-       // even if the mark-word is used. This is no problem since
-       // forwardee() will return NULL in the compaction phase as well.
--      object->init_mark_raw();
-+      object->init_mark();
-     } else {
-       // Make sure object has the correct mark-word set or that it will be
-       // fixed when restoring the preserved marks.
--      assert(object->mark_raw() == markWord::prototype_for_klass(object->klass()) || // Correct mark
-+      assert(object->mark() == markWord::prototype_for_klass(object->klass()) || // Correct mark
-              object->mark_must_be_preserved() || // Will be restored by PreservedMarksSet
--             (UseBiasedLocking && object->has_bias_pattern_raw()), // Will be restored by BiasedLocking
-+             (UseBiasedLocking && object->has_bias_pattern()), // Will be restored by BiasedLocking
-              "should have correct prototype obj: " PTR_FORMAT " mark: " PTR_FORMAT " prototype: " PTR_FORMAT,
--             p2i(object), object->mark_raw().value(), markWord::prototype_for_klass(object->klass()).value());
-+             p2i(object), object->mark().value(), markWord::prototype_for_klass(object->klass()).value());
-     }
-     assert(object->forwardee() == NULL, "should be forwarded to NULL");
-   }
-diff --git a/src/hotspot/share/gc/shared/dcevmSharedGC.cpp b/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
-index 3dee097f1d3..edc19a3077d 100644
---- a/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
-+++ b/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
-@@ -64,7 +64,7 @@ void DcevmSharedGC::copy_rescued_objects_back(GrowableArray<HeapWord*>* rescued_
-         Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(rescued_obj), cast_from_oop<HeapWord*>(new_obj), size);
-       }
- 
--      new_obj->init_mark_raw();
-+      new_obj->init_mark();
-       assert(oopDesc::is_oop(new_obj), "must be a valid oop");
-     }
-   }
-diff --git a/src/hotspot/share/gc/shared/space.inline.hpp b/src/hotspot/share/gc/shared/space.inline.hpp
-index e3a37280268..cafa2503ef4 100644
---- a/src/hotspot/share/gc/shared/space.inline.hpp
-+++ b/src/hotspot/share/gc/shared/space.inline.hpp
-@@ -371,7 +371,7 @@ inline void CompactibleSpace::scan_and_compact(SpaceType* space, bool redefiniti
-         } else {
-           DcevmSharedGC::update_fields(oop(cur_obj), oop(compaction_top));
-         }
--        oop(compaction_top)->init_mark_raw();
-+        oop(compaction_top)->init_mark();
-         assert(oop(compaction_top)->klass() != NULL, "should have a class");
- 
-         debug_only(prev_obj = cur_obj);
-diff --git a/src/hotspot/share/memory/universe.cpp b/src/hotspot/share/memory/universe.cpp
-index 247f2b3e8c0..4ae3b382b67 100644
---- a/src/hotspot/share/memory/universe.cpp
-+++ b/src/hotspot/share/memory/universe.cpp
-@@ -44,8 +44,6 @@
- #include "gc/shared/oopStorageSet.hpp"
- #include "gc/shared/stringdedup/stringDedup.hpp"
- #include "gc/shared/tlab_globals.hpp"
--#include "gc/shared/weakProcessor.hpp"
--#include "interpreter/interpreter.hpp"
- #include "logging/log.hpp"
- #include "logging/logStream.hpp"
- #include "memory/metadataFactory.hpp"
-@@ -73,8 +71,6 @@
- #include "runtime/jniHandles.hpp"
- #include "runtime/thread.inline.hpp"
- #include "runtime/timerTrace.hpp"
--#include "runtime/vmOperations.hpp"
--#include "services/management.hpp"
- #include "services/memoryService.hpp"
- #include "utilities/align.hpp"
- #include "utilities/autoRestore.hpp"
-@@ -208,73 +204,6 @@ void Universe::basic_type_classes_do(KlassClosure *closure) {
-   }
- }
- 
--#define DO_PRIMITIVE_MIRROR(m) \
--  f->do_oop((oop*) &m);
--
--// FIXME: (DCEVM) This method should iterate all pointers that are not within heap objects.
--void Universe::root_oops_do(OopClosure *oopClosure) {
--  Universe::oops_do(oopClosure);
--//  ReferenceProcessor::oops_do(oopClosure); (tw) check why no longer there
--  JNIHandles::oops_do(oopClosure);   // Global (strong) JNI handles
--  Threads::oops_do(oopClosure, NULL);
--  ObjectSynchronizer::oops_do(oopClosure);
--  // (DCEVM) TODO: Check if this is correct?
--  Management::oops_do(oopClosure);
--  OopStorageSet::vm_global()->oops_do(oopClosure);
--  // CLDToOopClosure cld_closure(oopClosure, ClassLoaderData::_claim_none);
--  // ClassLoaderDataGraph::cld_do(&cld_closure);
--
--  // Now adjust pointers in remaining weak roots.  (All of which should
--  // have been cleared if they pointed to non-surviving objects.)
--  // Global (weak) JNI handles
--  WeakProcessor::oops_do(oopClosure);
--
--  JvmtiExport::oops_do(oopClosure);
--
--  CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
--  CodeCache::blobs_do(&blobClosure);
--  
--  AOT_ONLY(AOTLoader::oops_do(oopClosure);)
--  
--  // StringTable::oops_do was removed in j15
--  // StringTable::oops_do(oopClosure);
--
--  // OopStorageSet::vm_global()->oops_do(oopClosure);
--
--}
--
--void Universe::oops_do(OopClosure* f) {
--  PRIMITIVE_MIRRORS_DO(DO_PRIMITIVE_MIRROR);
--
--  for (int i = T_BOOLEAN; i < T_VOID+1; i++) {
--    f->do_oop((oop*) &_mirrors[i]);
--  }
--  assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking");
--
--  f->do_oop((oop*)&_the_empty_class_array);
--  f->do_oop((oop*)&_the_null_sentinel);
--  f->do_oop((oop*)&_the_null_string);
--  f->do_oop((oop*)&_the_min_jint_string);
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_java_heap));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_c_heap));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_metaspace));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_class_metaspace));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_array_size));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_gc_overhead_limit));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_realloc_objects));
--  f->do_oop((oop*)&out_of_memory_errors()->obj_at(_oom_retry));
--  f->do_oop((oop*)&_delayed_stack_overflow_error_message);
--  f->do_oop((oop*)&_preallocated_out_of_memory_error_array);
--  f->do_oop((oop*)&_null_ptr_exception_instance);
--  f->do_oop((oop*)&_arithmetic_exception_instance);
--  f->do_oop((oop*)&_virtual_machine_error_instance);
--  f->do_oop((oop*)&_main_thread_group);
--  f->do_oop((oop*)&_system_thread_group);
--  f->do_oop((oop*)&_reference_pending_list);
--  debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);)
--  ThreadsSMRSupport::exiting_threads_oops_do(f);
--}
--
- void LatestMethodCache::metaspace_pointers_do(MetaspaceClosure* it) {
-   it->push(&_klass);
- }
-diff --git a/src/hotspot/share/memory/universe.hpp b/src/hotspot/share/memory/universe.hpp
-index cb320076a55..4b2211c415e 100644
---- a/src/hotspot/share/memory/universe.hpp
-+++ b/src/hotspot/share/memory/universe.hpp
-@@ -326,13 +326,6 @@ class Universe: AllStatic {
-   static bool        should_fill_in_stack_trace(Handle throwable);
-   static void check_alignment(uintx size, uintx alignment, const char* name);
- 
--  // Iteration
--
--  static void root_oops_do(OopClosure *oopClosure); // FIXME: kill...
--  // Apply "f" to the addresses of all the direct heap pointers maintained
--  // as static fields of "Universe".
--  static void oops_do(OopClosure* f);
--
-   // CDS support
-   static void serialize(SerializeClosure* f);
- 
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index a8ac12450d7..ab2d7f10f9c 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -1286,7 +1286,7 @@ void InstanceKlass::init_implementor() {
- // (DCEVM) - init_implementor() for dcevm
- void InstanceKlass::init_implementor_from_redefine() {
-   assert(is_interface(), "not interface");
--  Klass* volatile* addr = adr_implementor();
-+  InstanceKlass* volatile* addr = adr_implementor();
-   assert(addr != NULL, "null addr");
-   if (addr != NULL) {
-     *addr = NULL;
-@@ -3828,7 +3828,7 @@ void InstanceKlass::verify_on(outputStream* st) {
- 
-     guarantee(sib->is_klass(), "should be klass");
-     // TODO: (DCEVM) explain
--    guarantee(sib->super() == super || AllowEnhancedClassRedefinition && super->newest_version() == SystemDictionary::Object_klass(), "siblings should have same superklass");
-+    guarantee(sib->super() == super || AllowEnhancedClassRedefinition && super->newest_version() == vmClasses::Object_klass(), "siblings should have same superklass");
-   }
- 
-   // Verify local interfaces
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index af34d751bdb..0b1db1581d1 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -26,8 +26,10 @@
- #include "aot/aotLoader.hpp"
- #include "classfile/classFileParser.hpp"
- #include "classfile/classFileStream.hpp"
-+#include "classfile/classLoadInfo.hpp"
- #include "classfile/metadataOnStackMark.hpp"
- #include "classfile/systemDictionary.hpp"
-+#include "classfile/symbolTable.hpp"
- #include "classfile/verifier.hpp"
- #include "classfile/dictionary.hpp"
- #include "classfile/classLoaderDataGraph.hpp"
-@@ -198,8 +200,8 @@ class FieldCopier : public FieldClosure {
-     if (found && result.is_static()) {
-       log_trace(redefine, class, obsolete, metadata)("Copying static field value for field %s old_offset=%d new_offset=%d",
-                                                fd->name()->as_C_string(), result.offset(), fd->offset());
--      memcpy(cur_oop->obj_field_addr_raw<HeapWord>(fd->offset()),
--             old_oop->obj_field_addr_raw<HeapWord>(result.offset()),
-+      memcpy(cur_oop->obj_field_addr<HeapWord>(fd->offset()),
-+             old_oop->obj_field_addr<HeapWord>(result.offset()),
-              type2aelembytes(fd->field_type()));
- 
-       // Static fields may have references to java.lang.Class
-@@ -242,6 +244,17 @@ void VM_EnhancedRedefineClasses::register_nmethod_g1(nmethod* nm) {
-   }
- }
- 
-+void VM_EnhancedRedefineClasses::root_oops_do(OopClosure *oopClosure) {
-+  Universe::vm_global()->oops_do(oopClosure);
-+
-+  Threads::oops_do(oopClosure, NULL);
-+  AOT_ONLY(AOTLoader::oops_do(oopClosure);)
-+  OopStorageSet::strong_oops_do(oopClosure);
-+
-+  CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
-+  CodeCache::blobs_do(&blobClosure);
-+}
-+
- // TODO comment
- struct StoreBarrier {
-   // TODO: j10 review change ::oop_store -> HeapAccess<>::oop_store
-@@ -558,7 +571,7 @@ void VM_EnhancedRedefineClasses::doit() {
-       _timer_heap_iterate.stop();
-     }
- 
--    Universe::root_oops_do(&oopClosureNoBarrier);
-+    root_oops_do(&oopClosureNoBarrier);
- 
-     if (UseG1GC) {
-       // this should work also for other GCs
-@@ -737,8 +750,8 @@ bool VM_EnhancedRedefineClasses::is_modifiable_class(oop klass_mirror) {
- //  - link new classes
- jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
- 
--  _affected_klasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(_class_count, true);
--  _new_classes = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<InstanceKlass*>(_class_count, true);
-+  _affected_klasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(_class_count);
-+  _new_classes = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<InstanceKlass*>(_class_count);
- 
-   ResourceMark rm(THREAD);
- 
-@@ -832,12 +845,12 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
-                             !the_class->is_non_strong_hidden(),    // is_strong_hidden
-                             true);    // FIXME: check if correct. can_access_vm_annotations
- 
--      k = SystemDictionary::parse_stream(the_class_sym,
--                                         the_class_loader,
--                                         &st,
--                                         cl_info,
--                                         the_class,
--                                         THREAD);
-+      k = SystemDictionary::resolve_from_stream(&st,
-+                                                the_class_sym,
-+                                                the_class_loader,
-+                                                cl_info,
-+                                                the_class,
-+                                                THREAD);
- 
-       k->class_loader_data()->exchange_holders(the_class->class_loader_data());
- 
-@@ -853,12 +866,12 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
-       }
- 
-     } else {
--      k = SystemDictionary::resolve_from_stream(the_class_sym,
--                                                  the_class_loader,
--                                                  protection_domain,
--                                                  &st,
--                                                  the_class,
--                                                  THREAD);
-+      k = SystemDictionary::resolve_from_stream(&st,
-+                                                the_class_sym,
-+                                                the_class_loader,
-+                                                protection_domain,
-+                                                the_class,
-+                                                THREAD);
-     }
-     // Clear class_being_redefined just to be sure.
-     state->clear_class_being_redefined();
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-index 43f1aff8e91..ae0a15281f3 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-@@ -124,6 +124,8 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
-   static void register_nmethod_g1(nmethod* nm);
-   static void unpatch_bytecode(Method* method, TRAPS);
- 
-+  void root_oops_do(OopClosure *oopClosure);
-+
-   // Figure out which new methods match old methods in name and signature,
-   // which methods have been added, and which are no longer present
-   void compute_added_deleted_matching_methods();
-diff --git a/src/hotspot/share/prims/resolvedMethodTable.cpp b/src/hotspot/share/prims/resolvedMethodTable.cpp
-index 3c29eda4da0..a1eadc2958a 100644
---- a/src/hotspot/share/prims/resolvedMethodTable.cpp
-+++ b/src/hotspot/share/prims/resolvedMethodTable.cpp
-@@ -34,6 +34,7 @@
- #include "oops/access.inline.hpp"
- #include "oops/method.hpp"
- #include "oops/oop.inline.hpp"
-+#include "oops/klass.inline.hpp"
- #include "oops/weakHandle.inline.hpp"
- #include "prims/resolvedMethodTable.hpp"
- #include "runtime/atomic.hpp"
-@@ -375,7 +376,7 @@ class AdjustMethodEntriesDcevm : public StackObj {
-   GrowableArray<oop>* _oops_to_add;
- public:
-   AdjustMethodEntriesDcevm(GrowableArray<oop>* oops_to_add, bool* trace_name_printed) : _trace_name_printed(trace_name_printed), _oops_to_add(oops_to_add) {};
--  bool operator()(WeakHandle<vm_resolved_method_table_data>* entry) {
-+  bool operator()(WeakHandle* entry) {
-     oop mem_name = entry->peek();
-     if (mem_name == NULL) {
-       // Removed
-@@ -460,7 +461,7 @@ void ResolvedMethodTable::adjust_method_entries_dcevm(bool * trace_name_printed)
-       if (_local_table->get(thread, lookup, rmg)) {
-         break;
-       }
--      WeakHandle<vm_resolved_method_table_data> wh = WeakHandle<vm_resolved_method_table_data>::create(Handle(thread, mem_name));
-+      WeakHandle wh(_oop_storage, mem_name);
-       // The hash table takes ownership of the WeakHandle, even if it's not inserted.
-       if (_local_table->insert(thread, lookup, wh)) {
-         log_insert(method);
-diff --git a/src/hotspot/share/runtime/arguments.hpp b/src/hotspot/share/runtime/arguments.hpp
-index 3adc03a6583..b8eb4d0ab24 100644
---- a/src/hotspot/share/runtime/arguments.hpp
-+++ b/src/hotspot/share/runtime/arguments.hpp
-@@ -487,6 +487,8 @@ class Arguments : AllStatic {
-   // Adjusts the arguments after the OS have adjusted the arguments
-   static jint adjust_after_os();
- 
-+  // Check for consistency in the selection of the garbage collector.
-+  static bool check_gc_consistency();        // Check user-selected gc
-   // Check consistency or otherwise of VM argument settings
-   static bool check_vm_args_consistency();
-   // Used by os_solaris
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0022-Fix-crash-on-GrowableArray-allocation-in-C_HEAP.patch

@@ -1,27 +0,0 @@
-From 09f5f22d61675a9f8909e903fa6e6f51507b656c Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Fri, 12 Feb 2021 11:38:48 +0100
-Subject: [PATCH 22/45] Fix crash on GrowableArray allocation in C_HEAP
-
----
- 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 0b1db1581d1..b88c071be13 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -750,8 +750,8 @@ bool VM_EnhancedRedefineClasses::is_modifiable_class(oop klass_mirror) {
- //  - link new classes
- jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
- 
--  _affected_klasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(_class_count);
--  _new_classes = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<InstanceKlass*>(_class_count);
-+  _affected_klasses = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(_class_count, mtInternal);
-+  _new_classes = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<InstanceKlass*>(_class_count, mtInternal);
- 
-   ResourceMark rm(THREAD);
- 
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0023-Rename-confusing-method-name-old_if_redefined-to-old.patch

@@ -1,49 +0,0 @@
-From 90b8572ff42dd5f64a6d2063aab6842bceddcf55 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Fri, 12 Feb 2021 11:39:05 +0100
-Subject: [PATCH 23/45] Rename confusing method name old_if_redefined to
- old_if_redefining
-
----
- src/hotspot/share/classfile/dictionary.cpp | 4 ++--
- src/hotspot/share/classfile/dictionary.hpp | 2 +-
- 2 files changed, 3 insertions(+), 3 deletions(-)
-
-diff --git a/src/hotspot/share/classfile/dictionary.cpp b/src/hotspot/share/classfile/dictionary.cpp
-index 223b9e1e7a9..2b236a7724e 100644
---- a/src/hotspot/share/classfile/dictionary.cpp
-+++ b/src/hotspot/share/classfile/dictionary.cpp
-@@ -359,7 +359,7 @@ 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;
-   }
-@@ -373,7 +373,7 @@ InstanceKlass* Dictionary::find_class(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);
- }
- 
- void Dictionary::add_protection_domain(int index, unsigned int hash,
-diff --git a/src/hotspot/share/classfile/dictionary.hpp b/src/hotspot/share/classfile/dictionary.hpp
-index bdfef5c8663..e997cfdcabd 100644
---- a/src/hotspot/share/classfile/dictionary.hpp
-+++ b/src/hotspot/share/classfile/dictionary.hpp
-@@ -109,7 +109,7 @@ public:
-                              Handle protection_domain);
- 
-   // (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;
-   }
- };
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0024-Check-InstanceKlass-has_nestmate_access_to-with-acti.patch

@@ -1,43 +0,0 @@
-From 86f7318e889fcb0d883501b4a70105d087b39482 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Fri, 12 Feb 2021 12:33:47 +0100
-Subject: [PATCH 24/45] 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 | 9 +++++++--
- 1 file changed, 7 insertions(+), 2 deletions(-)
-
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index ab2d7f10f9c..bcb0da6301f 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -398,9 +398,9 @@ 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) {
--    // TODO: (DCEVM) check if it correct. It fix problems with lambdas (hidden)
--    cur_host = InstanceKlass::cast(cur_host->newest_version());
-+    cur_host = InstanceKlass::cast(cur_host->active_version());
-   }
- 
-   Klass* k_nest_host = k->nest_host(CHECK_false);
-@@ -408,6 +408,11 @@ bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
-     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);
- 
-   ResourceMark rm(THREAD);
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0025-JBR-3111-Update-class-in-all-dictionaries-where-it-w.patch

@@ -1,95 +0,0 @@
-From 79ea607bf68161cfcee3a681d14540cffe5589a3 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 13 Feb 2021 20:47:52 +0100
-Subject: [PATCH 25/45] 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/classLoaderDataGraph.cpp | 9 +++++++++
- src/hotspot/share/classfile/classLoaderDataGraph.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/classLoaderDataGraph.cpp b/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-index fda5d2eb1ba..67ade5709f6 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-@@ -455,6 +455,15 @@ 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;
-+}
-+
- void ClassLoaderDataGraph::verify_dictionary() {
-   FOR_ALL_DICTIONARY(cld) {
-     cld->dictionary()->verify();
-diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.hpp b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-index c3bcc7271e6..ebdb0bc2c8c 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-@@ -108,6 +108,9 @@ class ClassLoaderDataGraph : public AllStatic {
-   // (DCEVM) Enhanced class redefinition
-   static void rollback_redefinition();
- 
-+  // Enhanced class redefinition
-+  static bool dictionary_classes_do_update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass);
-+
-   // VM_CounterDecay iteration support
-   static InstanceKlass* try_get_next_class();
-   static void adjust_saved_class(ClassLoaderData* cld);
-diff --git a/src/hotspot/share/classfile/dictionary.cpp b/src/hotspot/share/classfile/dictionary.cpp
-index 2b236a7724e..bb1d09fa7a2 100644
---- a/src/hotspot/share/classfile/dictionary.cpp
-+++ b/src/hotspot/share/classfile/dictionary.cpp
-@@ -322,7 +322,7 @@ 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 e997cfdcabd..7f8d8e35fc3 100644
---- a/src/hotspot/share/classfile/dictionary.hpp
-+++ b/src/hotspot/share/classfile/dictionary.hpp
-@@ -83,7 +83,7 @@ public:
-   void verify();
- 
-   // (DCEVM) 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 63de2e2f099..35e2f376870 100644
---- a/src/hotspot/share/classfile/systemDictionary.cpp
-+++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -1441,7 +1441,9 @@ void SystemDictionary::define_instance_class(InstanceKlass* k, InstanceKlass* ol
- 
-   unsigned int name_hash = dictionary->compute_hash(name_h);
-   if (is_redefining) {
--    bool ok = dictionary->update_klass(name_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(name_hash, k, class_loader, !is_redefining, CHECK);
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0026-Add-ClassLoaderDataGraph_lock-to-define-new-class-in.patch

@@ -1,29 +0,0 @@
-From 99c65ab84080d35c1ba1df6efd5641ad3ab9e1e8 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 20 Feb 2021 15:47:47 +0100
-Subject: [PATCH 26/45] Add ClassLoaderDataGraph_lock to define new class in
- enhanced redefiniton
-
-ClassLoaderDataGraph locking for introduced in redefinition in
-java.version>11
----
- src/hotspot/share/classfile/systemDictionary.cpp | 2 ++
- 1 file changed, 2 insertions(+)
-
-diff --git a/src/hotspot/share/classfile/systemDictionary.cpp b/src/hotspot/share/classfile/systemDictionary.cpp
-index 35e2f376870..c628cb9da83 100644
---- a/src/hotspot/share/classfile/systemDictionary.cpp
-+++ b/src/hotspot/share/classfile/systemDictionary.cpp
-@@ -1443,7 +1443,9 @@ void SystemDictionary::define_instance_class(InstanceKlass* k, InstanceKlass* ol
-   if (is_redefining) {
-     // 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
-+    ClassLoaderDataGraph_lock->lock();
-     bool ok = ClassLoaderDataGraph::dictionary_classes_do_update_klass(name_h, k, old_klass);
-+    ClassLoaderDataGraph_lock->unlock();
-     assert (ok, "must have found old class and updated!");
-   }
-   check_constraints(name_hash, k, class_loader, !is_redefining, CHECK);
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0027-JBR-3140-support-for-modularized-HotswapAgent.patch

@@ -1,180 +0,0 @@
-From e7e7920986355d6fd5ad0c333ec780c93583d030 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Thu, 18 Jun 2020 18:40:11 +0200
-Subject: [PATCH 27/45] JBR-3140 - support for modularized HotswapAgent
-
-Add -XX:HotswapAgent=[disabled,fatjar.core]
----
- src/hotspot/share/runtime/arguments.cpp       | 77 +++++++++++++++++++
- src/hotspot/share/runtime/arguments.hpp       |  4 +
- .../flags/jvmFlagConstraintsRuntime.cpp       |  9 +++
- .../flags/jvmFlagConstraintsRuntime.hpp       |  3 +-
- src/hotspot/share/runtime/globals.hpp         | 11 ++-
- 5 files changed, 102 insertions(+), 2 deletions(-)
-
-diff --git a/src/hotspot/share/runtime/arguments.cpp b/src/hotspot/share/runtime/arguments.cpp
-index 252ebbc4e57..9c6fab8ae4b 100644
---- a/src/hotspot/share/runtime/arguments.cpp
-+++ b/src/hotspot/share/runtime/arguments.cpp
-@@ -4034,6 +4034,8 @@ jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) {
-     }
-   }
- 
-+  setup_hotswap_agent();
-+
- #if !INCLUDE_CDS
-   if (DumpSharedSpaces || RequireSharedSpaces) {
-     jio_fprintf(defaultStream::error_stream(),
-@@ -4390,3 +4392,78 @@ 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
- }
-+
-+void Arguments::setup_hotswap_agent() {
-+
-+  if (DumpSharedSpaces)
-+    return;
-+
-+  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 (ha_fatjar || ha_core) {
-+
-+    char ext_path_str[JVM_MAXPATHLEN];
-+
-+    os::jvm_path(ext_path_str, sizeof(ext_path_str));
-+    for (int i = 0; i < 3; i++) {
-+      char *end = strrchr(ext_path_str, *os::file_separator());
-+      if (end != NULL) *end = '\0';
-+    }
-+    size_t ext_path_length = strlen(ext_path_str);
-+    if (ext_path_length >= 3) {
-+      if (strcmp(ext_path_str + ext_path_length - 3, "lib") != 0) {
-+        if (ext_path_length < JVM_MAXPATHLEN - 4) {
-+          jio_snprintf(ext_path_str + ext_path_length, sizeof(ext_path_str) - ext_path_length, "%slib", os::file_separator());
-+          ext_path_length += 4;
-+        }
-+      }
-+    }
-+    if (ext_path_length < JVM_MAXPATHLEN - 10) {
-+      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
-+  // Use to access java.lang.reflect.Proxy/proxyCache
-+  create_numbered_module_property("jdk.module.addopens", "java.base/java.lang=ALL-UNNAMED", addopens_count++);
-+  // Class of  field java.lang.reflect.Proxy/proxyCache
-+  create_numbered_module_property("jdk.module.addopens", "java.base/jdk.internal.loader=ALL-UNNAMED", addopens_count++);
-+  // Use to access java.io.Reader, java.io.InputStream, java.io.FileInputStream
-+  create_numbered_module_property("jdk.module.addopens", "java.base/java.io=ALL-UNNAMED", addopens_count++);
-+  // java.beans.Introspector access
-+  create_numbered_module_property("jdk.module.addopens", "java.desktop/java.beans=ALL-UNNAMED", addopens_count++);
-+  // java.beans.Introspector access
-+  create_numbered_module_property("jdk.module.addopens", "java.desktop/com.sun.beans=ALL-UNNAMED", addopens_count++);
-+  // com.sun.beans.introspect.ClassInfo access
-+  create_numbered_module_property("jdk.module.addopens", "java.desktop/com.sun.beans.introspect=ALL-UNNAMED", addopens_count++);
-+  // com.sun.beans.introspect.util.Cache access
-+  create_numbered_module_property("jdk.module.addopens", "java.desktop/com.sun.beans.util=ALL-UNNAMED", addopens_count++);
-+
-+}
-diff --git a/src/hotspot/share/runtime/arguments.hpp b/src/hotspot/share/runtime/arguments.hpp
-index b8eb4d0ab24..a14e11b48ef 100644
---- a/src/hotspot/share/runtime/arguments.hpp
-+++ b/src/hotspot/share/runtime/arguments.hpp
-@@ -496,6 +496,10 @@ class Arguments : AllStatic {
- 
-   static size_t conservative_max_heap_alignment() { return _conservative_max_heap_alignment; }
- 
-+
-+  // Initialize HotswapAgent
-+  static void setup_hotswap_agent();
-+
-   // Return the maximum size a heap with compressed oops can take
-   static size_t max_heap_for_compressed_oops();
- 
-diff --git a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp
-index 5b09758e089..e55b68e63a6 100644
---- a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp
-+++ b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.cpp
-@@ -158,6 +158,15 @@ JVMFlag::Error NUMAInterleaveGranularityConstraintFunc(size_t value, bool verbos
-                         " ... " UINTX_FORMAT " ]\n", value, min, max);
-     return JVMFlag::VIOLATES_CONSTRAINT;
-   }
-+  return JVMFlag::SUCCESS;
-+}
- 
-+JVMFlag::Error HotswapAgentConstraintFunc(ccstr 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 8bc3a9a1548..c5f58fd16ee 100644
---- a/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.hpp
-+++ b/src/hotspot/share/runtime/flags/jvmFlagConstraintsRuntime.hpp
-@@ -42,7 +42,8 @@
-   f(intx,   BiasedLockingDecayTimeFunc)               \
-   f(intx,   PerfDataSamplingIntervalFunc)             \
-   f(uintx,  VMPageSizeConstraintFunc)                 \
--  f(size_t, NUMAInterleaveGranularityConstraintFunc)
-+  f(size_t, NUMAInterleaveGranularityConstraintFunc)  \
-+  f(ccstr, HotswapAgentConstraintFunc)
- 
- RUNTIME_CONSTRAINTS(DECLARE_CONSTRAINT)
- 
-diff --git a/src/hotspot/share/runtime/globals.hpp b/src/hotspot/share/runtime/globals.hpp
-index fb6d1667156..20838a878ce 100644
---- a/src/hotspot/share/runtime/globals.hpp
-+++ b/src/hotspot/share/runtime/globals.hpp
-@@ -2090,7 +2090,16 @@ const intx ObjectAlignmentInBytes = 8;
-                                                                             \
-   product(bool, AllowEnhancedClassRedefinition, false,                      \
-              "Allow enhanced class redefinition beyond swapping method "    \
--             "bodies")
-+             "bodies")                                                      \
-+                                                                            \
-+  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)
- 
- 
- // end of RUNTIME_FLAGS
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0028-Support-for-redefinition-of-Well-Known-classses-java.patch

@@ -1,347 +0,0 @@
-From 854df9651b358f3a8d89cd8a7d60fed26ca3d1d5 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 28/45] 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 ++
- src/hotspot/share/classfile/vmClasses.cpp     | 10 +++
- src/hotspot/share/classfile/vmClasses.hpp     |  4 ++
- 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         |  2 +
- .../prims/jvmtiEnhancedRedefineClasses.cpp    | 63 ++++++++++++++++++-
- .../prims/jvmtiEnhancedRedefineClasses.hpp    |  2 +
- 11 files changed, 142 insertions(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/ci/ciKlass.hpp b/src/hotspot/share/ci/ciKlass.hpp
-index 467284b7cde..644993a7513 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_CI_CIKLASS_HPP
-diff --git a/src/hotspot/share/ci/ciObjectFactory.cpp b/src/hotspot/share/ci/ciObjectFactory.cpp
-index 664062a0f74..e9cb49be3ff 100644
---- a/src/hotspot/share/ci/ciObjectFactory.cpp
-+++ b/src/hotspot/share/ci/ciObjectFactory.cpp
-@@ -74,7 +74,10 @@ GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
- ciSymbol*                 ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
- int                       ciObjectFactory::_shared_ident_limit = 0;
- volatile bool             ciObjectFactory::_initialized = false;
-+volatile bool             ciObjectFactory::_reinitialize_vm_klasses = false;
- 
-+// TODO: review...
-+Arena* ciObjectFactory::_initial_arena = NULL;
- 
- // ------------------------------------------------------------------
- // ciObjectFactory::ciObjectFactory
-@@ -110,6 +113,7 @@ 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();
-@@ -118,6 +122,36 @@ void ciObjectFactory::initialize() {
- 
- }
- 
-+// (DCEVM) vm classes could be modified
-+void ciObjectFactory::reinitialize_vm_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_vm_classes();
-+  _reinitialize_vm_klasses = false;
-+}
-+
-+// (DCEVM) vm classes could be modified
-+void ciObjectFactory::do_reinitialize_vm_classes() {
-+#define VM_CLASS_DEFN(name, ignore_s)   \
-+  if (ciEnv::_##name != NULL && ciEnv::_##name->new_version() != NULL) { \
-+    int old_ident = ciEnv::_##name->ident(); \
-+    ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass(); \
-+    ciEnv::_##name->compute_nonstatic_fields(); \
-+    ciEnv::_##name->set_ident(old_ident); \
-+  }
-+
-+  VM_CLASSES_DO(VM_CLASS_DEFN)
-+#undef VM_CLASS_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 fdefc8e3b92..1ed8732cb40 100644
---- a/src/hotspot/share/ci/ciObjectFactory.hpp
-+++ b/src/hotspot/share/ci/ciObjectFactory.hpp
-@@ -42,9 +42,11 @@ class ciObjectFactory : public ResourceObj {
- 
- private:
-   static volatile bool _initialized;
-+  static volatile bool _reinitialize_vm_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;
-@@ -90,10 +92,14 @@ private:
-   ciInstance* get_unloaded_instance(ciInstanceKlass* klass);
- 
-   static int compare_cimetadata(ciMetadata** a, ciMetadata** b);
-+  void do_reinitialize_vm_classes();
- public:
-   static bool is_initialized() { return _initialized; }
-+  static bool is_reinitialize_vm_klasses() { return _reinitialize_vm_klasses; }
-+  static void set_reinitialize_vm_klasses() { _reinitialize_vm_klasses = true; }
- 
-   static void initialize();
-+  static void reinitialize_vm_classes();
-   void init_shared_objects();
-   void remove_symbols();
- 
-diff --git a/src/hotspot/share/classfile/vmClasses.cpp b/src/hotspot/share/classfile/vmClasses.cpp
-index 2bd1ca65cc0..3ec13d952d8 100644
---- a/src/hotspot/share/classfile/vmClasses.cpp
-+++ b/src/hotspot/share/classfile/vmClasses.cpp
-@@ -259,3 +259,13 @@ BasicType vmClasses::box_klass_type(Klass* k) {
-   }
-   return T_OBJECT;
- }
-+
-+bool vmClasses::update_vm_klass(InstanceKlass* old_klass, InstanceKlass* new_klass) {
-+  for (int id = static_cast<int>(vmClassID::FIRST); id < static_cast<int>(vmClassID::LIMIT); id++) {
-+    if (_klasses[id] == old_klass) {
-+      _klasses[id] = new_klass;
-+      return true;
-+    }
-+  }
-+  return false;
-+}
-diff --git a/src/hotspot/share/classfile/vmClasses.hpp b/src/hotspot/share/classfile/vmClasses.hpp
-index 364014a2514..b637ff0ae3d 100644
---- a/src/hotspot/share/classfile/vmClasses.hpp
-+++ b/src/hotspot/share/classfile/vmClasses.hpp
-@@ -110,6 +110,10 @@ public:
-   static bool Cloneable_klass_loaded()      { return is_loaded(VM_CLASS_AT(Cloneable_klass));          }
-   static bool Parameter_klass_loaded()      { return is_loaded(VM_CLASS_AT(reflect_Parameter_klass));  }
-   static bool ClassLoader_klass_loaded()    { return is_loaded(VM_CLASS_AT(ClassLoader_klass));        }
-+
-+  // (DCEVM) vmClasses could be modified
-+  static bool update_vm_klass(InstanceKlass* new_klass, InstanceKlass* old_klass);
-+
- };
- 
- #endif // SHARE_CLASSFILE_VMCLASSES_HPP
-diff --git a/src/hotspot/share/classfile/vmSymbols.hpp b/src/hotspot/share/classfile/vmSymbols.hpp
-index dad94005f5c..82fd593224a 100644
---- a/src/hotspot/share/classfile/vmSymbols.hpp
-+++ b/src/hotspot/share/classfile/vmSymbols.hpp
-@@ -380,6 +380,8 @@
-   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 cc1dff089e8..aaf8e4b1f1e 100644
---- a/src/hotspot/share/compiler/compileBroker.cpp
-+++ b/src/hotspot/share/compiler/compileBroker.cpp
-@@ -1982,6 +1982,17 @@ 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_vm_klasses())
-+          {
-+            ASSERT_IN_VM;
-+            MutexLocker only_one(CompileThread_lock);
-+            if (ciObjectFactory::is_reinitialize_vm_klasses()) {
-+              ciObjectFactory::reinitialize_vm_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 4ae3b382b67..92da9bbe5f9 100644
---- a/src/hotspot/share/memory/universe.cpp
-+++ b/src/hotspot/share/memory/universe.cpp
-@@ -924,6 +924,14 @@ 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,
-+                          vmClasses::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 4b2211c415e..4d4c444220e 100644
---- a/src/hotspot/share/memory/universe.hpp
-+++ b/src/hotspot/share/memory/universe.hpp
-@@ -268,6 +268,8 @@ class Universe: AllStatic {
-   // Function to initialize these
-   static void initialize_known_methods(TRAPS);
- 
-+  static void reinitialize_loader_addClass_method(TRAPS);
-+
-   static void create_preallocated_out_of_memory_errors(TRAPS);
- 
-   // Reference pending list manipulation.  Access is protected by
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index b88c071be13..fb9da134e97 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -55,6 +55,7 @@
- #include "prims/resolvedMethodTable.hpp"
- #include "prims/methodHandles.hpp"
- #include "runtime/deoptimization.hpp"
-+#include "runtime/javaCalls.hpp"
- #include "runtime/jniHandles.inline.hpp"
- #include "runtime/relocator.hpp"
- #include "runtime/fieldDescriptor.hpp"
-@@ -66,6 +67,7 @@
- #include "gc/g1/g1CollectedHeap.hpp"
- #include "gc/shared/dcevmSharedGC.hpp"
- #include "gc/shared/scavengableNMethods.hpp"
-+#include "gc/shared/oopStorageSet.inline.hpp"
- #include "ci/ciObjectFactory.hpp"
- 
- Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
-@@ -521,6 +523,16 @@ void VM_EnhancedRedefineClasses::doit() {
-     redefine_single_class(_new_classes->at(i), thread);
-   }
- 
-+  // Update possible redefinition of vm classes (like ClassLoader)
-+  for (int i = 0; i < _new_classes->length(); i++) {
-+    InstanceKlass* cur = _new_classes->at(i);
-+    if (cur->old_version() != NULL && vmClasses::update_vm_klass(InstanceKlass::cast(cur->old_version()), cur))
-+    {
-+      log_trace(redefine, class, obsolete, metadata)("Well known class updated %s", cur->external_name());
-+      ciObjectFactory::set_reinitialize_vm_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(thread);
-@@ -688,12 +700,56 @@ 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 == vmClasses::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;
-   }
-@@ -1623,7 +1679,12 @@ 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 ae0a15281f3..d0d2f78aa62 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-@@ -150,6 +150,8 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
- 
-   u8 next_id();
- 
-+  void reinitializeJDKClasses();
-+
-   static void check_class(InstanceKlass* k_oop, TRAPS);
- 
-   static void dump_methods();
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0029-Fix-fastdebug-compilation-issues-cast_to_oop.patch

@@ -1,260 +0,0 @@
-From 01f4cb9929cad1512d02e20cc7538a29ff0d3ef1 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 15 May 2021 10:31:28 +0200
-Subject: [PATCH 29/45] Fix fastdebug compilation issues - cast_to_oop
-
----
- .../share/gc/g1/g1FullGCCompactTask.cpp       | 12 +++++-----
- .../share/gc/g1/g1FullGCCompactionPoint.cpp   | 10 ++++-----
- .../share/gc/g1/g1FullGCPrepareTask.cpp       |  4 ++--
- src/hotspot/share/gc/shared/dcevmSharedGC.cpp |  6 ++---
- src/hotspot/share/gc/shared/space.cpp         | 22 +++++++++----------
- src/hotspot/share/gc/shared/space.inline.hpp  | 14 ++++++------
- .../prims/jvmtiEnhancedRedefineClasses.cpp    |  2 +-
- 7 files changed, 35 insertions(+), 35 deletions(-)
-
-diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-index 058dea90828..765630a9826 100644
---- a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-@@ -183,18 +183,18 @@ size_t G1FullGCCompactTask::G1CompactRegionClosureDcevm::apply(oop obj) {
-     Klass* new_version = obj->klass()->new_version();
-     if (new_version->update_information() == NULL) {
-       Copy::aligned_conjoint_words(obj_addr, destination, size);
--      oop(destination)->set_klass(new_version);
-+      cast_to_oop(destination)->set_klass(new_version);
-     } else {
--      DcevmSharedGC::update_fields(obj, oop(destination));
-+      DcevmSharedGC::update_fields(obj, cast_to_oop(destination));
-     }
--    oop(destination)->init_mark();
--    assert(oop(destination)->klass() != NULL, "should have a class");
-+    cast_to_oop(destination)->init_mark();
-+    assert(cast_to_oop(destination)->klass() != NULL, "should have a class");
-     return size;
-   }
- 
-   Copy::aligned_conjoint_words(obj_addr, destination, size);
--  oop(destination)->init_mark();
--  assert(oop(destination)->klass() != NULL, "should have a class");
-+  cast_to_oop(destination)->init_mark();
-+  assert(cast_to_oop(destination)->klass() != NULL, "should have a class");
- 
-   return size;
- }
-diff --git a/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp b/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
-index 87b1977128a..028c182e68f 100644
---- a/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp
-@@ -171,7 +171,7 @@ void G1FullGCCompactionPoint::forward_dcevm(oop object, size_t size, bool force_
- 
-   // Store a forwarding pointer if the object should be moved.
-   if (cast_from_oop<HeapWord*>(object) != _compaction_top || force_forward) {
--    object->forward_to(oop(_compaction_top));
-+    object->forward_to(cast_to_oop(_compaction_top));
-   } else {
-     if (object->forwardee() != NULL) {
-       // Object should not move but mark-word is used so it looks like the
-@@ -208,17 +208,17 @@ void G1FullGCCompactionPoint::forward_rescued() {
-   for (;i<rescued_oops()->length(); i++) {
-     HeapWord* q = rescued_oops()->at(i);
- 
--    size_t size = oop(q)->size();
-+    size_t size = cast_to_oop(q)->size();
- 
-     // (DCEVM) There is a new version of the class of q => different size
--    if (oop(q)->klass()->new_version() != NULL) {
-+    if (cast_to_oop(q)->klass()->new_version() != NULL) {
-       // assert(size != new_size, "instances without changed size have to be updated prior to GC run");
--      size = oop(q)->size_given_klass(oop(q)->klass()->new_version());
-+      size = cast_to_oop(q)->size_given_klass(cast_to_oop(q)->klass()->new_version());
-     }
-     if (forward_compact_top(size) == NULL) {
-       break;
-     }
--    forward_dcevm(oop(q), size, true);
-+    forward_dcevm(cast_to_oop(q), size, true);
-   }
-   _last_rescued_oop = i;
- }
-diff --git a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
-index 05f0444cc7a..93c066383a1 100644
---- a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
-@@ -297,7 +297,7 @@ size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosureDcevm::apply(oop object)
- 
-   HeapWord* compact_top = _cp->forward_compact_top(forward_size);
- 
--  if (compact_top == NULL || must_rescue(object, oop(compact_top))) {
-+  if (compact_top == NULL || must_rescue(object, cast_to_oop(compact_top))) {
-     _cp->rescued_oops()->append(cast_from_oop<HeapWord*>(object));
-   } else {
-     _cp->forward_dcevm(object, forward_size, (size != forward_size));
-@@ -308,7 +308,7 @@ size_t G1FullGCPrepareTask::G1PrepareCompactLiveClosureDcevm::apply(oop object)
- 
- bool G1FullGCPrepareTask::G1PrepareCompactLiveClosureDcevm::must_rescue(oop old_obj, oop new_obj) {
-   // Only redefined objects can have the need to be rescued.
--  if (oop(old_obj)->klass()->new_version() == NULL) {
-+  if (old_obj->klass()->new_version() == NULL) {
-     return false;
-   }
- 
-diff --git a/src/hotspot/share/gc/shared/dcevmSharedGC.cpp b/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
-index edc19a3077d..de3d518b696 100644
---- a/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
-+++ b/src/hotspot/share/gc/shared/dcevmSharedGC.cpp
-@@ -46,7 +46,7 @@ void DcevmSharedGC::copy_rescued_objects_back(GrowableArray<HeapWord*>* rescued_
-   if (rescued_oops != NULL) {
-     for (int i=from; i < to; i++) {
-       HeapWord* rescued_ptr = rescued_oops->at(i);
--      oop rescued_obj = (oop) rescued_ptr;
-+      oop rescued_obj = cast_to_oop(rescued_ptr);
- 
-       int size = rescued_obj->size();
-       oop new_obj = rescued_obj->forwardee();
-@@ -75,7 +75,7 @@ void DcevmSharedGC::clear_rescued_objects_resource(GrowableArray<HeapWord*>* res
-   if (rescued_oops != NULL) {
-     for (int i=0; i < rescued_oops->length(); i++) {
-       HeapWord* rescued_ptr = rescued_oops->at(i);
--      int size = ((oop) rescued_ptr)->size();
-+      int size = cast_to_oop(rescued_ptr)->size();
-       FREE_RESOURCE_ARRAY(HeapWord, rescued_ptr, size);
-     }
-     rescued_oops->clear();
-@@ -114,7 +114,7 @@ void DcevmSharedGC::update_fields(oop q, oop new_location) {
-     if ((cast_from_oop<HeapWord*>(q) >= cast_from_oop<HeapWord*>(new_location) && cast_from_oop<HeapWord*>(q) < cast_from_oop<HeapWord*>(new_location) + new_size) ||
-         (cast_from_oop<HeapWord*>(new_location) >= cast_from_oop<HeapWord*>(q) && cast_from_oop<HeapWord*>(new_location) < cast_from_oop<HeapWord*>(q) + size)) {
-        tmp = NEW_RESOURCE_ARRAY(HeapWord, size);
--       q = (oop) tmp;
-+       q = cast_to_oop(tmp);
-        Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(tmp_obj), cast_from_oop<HeapWord*>(q), size);
-     }
-   }
-diff --git a/src/hotspot/share/gc/shared/space.cpp b/src/hotspot/share/gc/shared/space.cpp
-index 29a81348d2d..000760744f7 100644
---- a/src/hotspot/share/gc/shared/space.cpp
-+++ b/src/hotspot/share/gc/shared/space.cpp
-@@ -475,7 +475,7 @@ bool CompactibleSpace::must_rescue(oop old_obj, oop new_obj) {
- 
-   int new_size = old_obj->size_given_klass(oop(old_obj)->klass()->new_version());
-   int original_size = old_obj->size();
--  
-+
-   Generation* tenured_gen = GenCollectedHeap::heap()->old_gen();
-   bool old_in_tenured = tenured_gen->is_in_reserved(old_obj);
-   bool new_in_tenured = tenured_gen->is_in_reserved(new_obj);
-@@ -513,9 +513,9 @@ bool CompactibleSpace::must_rescue(oop old_obj, oop new_obj) {
- }
- 
- HeapWord* CompactibleSpace::rescue(HeapWord* old_obj) {
--  assert(must_rescue(oop(old_obj), oop(old_obj)->forwardee()), "do not call otherwise");
-+  assert(must_rescue(cast_to_oop(old_obj), cast_to_oop(old_obj)->forwardee()), "do not call otherwise");
- 
--  int size = oop(old_obj)->size();
-+  int size = cast_to_oop(old_obj)->size();
-   HeapWord* rescued_obj = NEW_RESOURCE_ARRAY(HeapWord, size);
-   Copy::aligned_disjoint_words(old_obj, rescued_obj, size);
- 
-@@ -803,16 +803,16 @@ HeapWord* CompactibleSpace::forward_with_rescue(HeapWord* q, size_t size,
-   size_t forward_size = size;
- 
-   // (DCEVM) There is a new version of the class of q => different size
--  if (oop(q)->klass()->new_version() != NULL) {
-+  if (cast_to_oop(q)->klass()->new_version() != NULL) {
- 
--    size_t new_size = oop(q)->size_given_klass(oop(q)->klass()->new_version());
-+    size_t new_size = cast_to_oop(q)->size_given_klass(cast_to_oop(q)->klass()->new_version());
-     // assert(size != new_size, "instances without changed size have to be updated prior to GC run");
-     forward_size = new_size;
-   }
- 
-   compact_top = forward_compact_top(forward_size, cp, compact_top);
- 
--  if (must_rescue(oop(q), oop(compact_top))) {
-+  if (must_rescue(cast_to_oop(q), cast_to_oop(compact_top))) {
-     if (MarkSweep::_rescued_oops == NULL) {
-       MarkSweep::_rescued_oops = new GrowableArray<HeapWord*>(128);
-     }
-@@ -820,7 +820,7 @@ HeapWord* CompactibleSpace::forward_with_rescue(HeapWord* q, size_t size,
-     return compact_top;
-   }
- 
--  return forward(oop(q), forward_size, cp, compact_top, force_forward);
-+  return forward(cast_to_oop(q), forward_size, cp, compact_top, force_forward);
- }
- 
- // Compute the forwarding addresses for the objects that need to be rescued.
-@@ -830,17 +830,17 @@ HeapWord* CompactibleSpace::forward_rescued(CompactPoint* cp, HeapWord* compact_
-     for (int i=0; i<MarkSweep::_rescued_oops->length(); i++) {
-       HeapWord* q = MarkSweep::_rescued_oops->at(i);
- 
--      /* size_t size = oop(q)->size();  changing this for cms for perm gen */
-+      /* size_t size = cast_to_oop(q)->size();  changing this for cms for perm gen */
-       size_t size = block_size(q);
- 
-       // (DCEVM) There is a new version of the class of q => different size
--      if (oop(q)->klass()->new_version() != NULL) {
--        size_t new_size = oop(q)->size_given_klass(oop(q)->klass()->new_version());
-+      if (cast_to_oop(q)->klass()->new_version() != NULL) {
-+        size_t new_size = cast_to_oop(q)->size_given_klass(cast_to_oop(q)->klass()->new_version());
-         // assert(size != new_size, "instances without changed size have to be updated prior to GC run");
-         size = new_size;
-       }
- 
--      compact_top = cp->space->forward(oop(q), size, cp, compact_top, true);
-+      compact_top = cp->space->forward(cast_to_oop(q), size, cp, compact_top, true);
-       assert(compact_top <= end(), "must not write over end of space!");
-     }
-     MarkSweep::_rescued_oops->clear();
-diff --git a/src/hotspot/share/gc/shared/space.inline.hpp b/src/hotspot/share/gc/shared/space.inline.hpp
-index cafa2503ef4..076ce6b0cce 100644
---- a/src/hotspot/share/gc/shared/space.inline.hpp
-+++ b/src/hotspot/share/gc/shared/space.inline.hpp
-@@ -351,7 +351,7 @@ inline void CompactibleSpace::scan_and_compact(SpaceType* space, bool redefiniti
-       size_t size = space->obj_size(cur_obj);
-       HeapWord* compaction_top = cast_from_oop<HeapWord*>(cast_to_oop(cur_obj)->forwardee());
- 
--      if (redefinition_run &&  space->must_rescue(oop(cur_obj), oop(cur_obj)->forwardee())) {
-+      if (redefinition_run &&  space->must_rescue(cast_to_oop(cur_obj), cast_to_oop(cur_obj)->forwardee())) {
-          space->rescue(cur_obj);
-         debug_only(Copy::fill_to_words(cur_obj, size, 0));
-         cur_obj += size;
-@@ -363,16 +363,16 @@ inline void CompactibleSpace::scan_and_compact(SpaceType* space, bool redefiniti
- 
-       // copy object and reinit its mark
-       assert(redefinition_run || cur_obj != compaction_top, "everything in this pass should be moving");
--      if (redefinition_run && oop(cur_obj)->klass()->new_version() != NULL) {
--        Klass* new_version = oop(cur_obj)->klass()->new_version();
-+      if (redefinition_run && cast_to_oop(cur_obj)->klass()->new_version() != NULL) {
-+        Klass* new_version = cast_to_oop(cur_obj)->klass()->new_version();
-         if (new_version->update_information() == NULL) {
-           Copy::aligned_conjoint_words(cur_obj, compaction_top, size);
--          oop(compaction_top)->set_klass(new_version);
-+          cast_to_oop(compaction_top)->set_klass(new_version);
-         } else {
--          DcevmSharedGC::update_fields(oop(cur_obj), oop(compaction_top));
-+          DcevmSharedGC::update_fields(cast_to_oop(cur_obj), cast_to_oop(compaction_top));
-         }
--        oop(compaction_top)->init_mark();
--        assert(oop(compaction_top)->klass() != NULL, "should have a class");
-+        cast_to_oop(compaction_top)->init_mark();
-+        assert(cast_to_oop(compaction_top)->klass() != NULL, "should have a class");
- 
-         debug_only(prev_obj = cur_obj);
-         cur_obj += size;
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index fb9da134e97..890382e2029 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -439,7 +439,7 @@ public:
-     int size = o->size();
-     if (_tmp_obj_size < size) {
-       _tmp_obj_size = size;
--      _tmp_obj = (oop)resource_allocate_bytes(size * HeapWordSize);
-+      _tmp_obj = cast_to_oop(resource_allocate_bytes(size * HeapWordSize));
-     }
-     Copy::aligned_disjoint_words(cast_from_oop<HeapWord*>(o), cast_from_oop<HeapWord*>(_tmp_obj), size);
-   }
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0030-JBR-3458-Skip-dynamic-proxy-classes-based-on-com.sun.patch

@@ -1,27 +0,0 @@
-From cac2eac1986ae05e264b2213d0d2658e2f57f07f 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 30/45] 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 890382e2029..90dfc1ae545 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -707,7 +707,8 @@ 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 == vmClasses::ClassLoader_klass()) {
-           // ClassLoader.addClass method is cached in Universe, we must redefine
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0031-JBR-3459-Fix-race-condition-in-ClassLoaderDataGraph-.patch

@@ -1,81 +0,0 @@
-From 4c87af809d20a12553f155110592a9f230ec0ea5 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 31/45] 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.
----
- .../share/classfile/classLoaderDataGraph.cpp       | 10 ++++++++++
- .../share/classfile/classLoaderDataGraph.hpp       |  4 ++++
- .../share/prims/jvmtiEnhancedRedefineClasses.cpp   | 14 ++++++++++++--
- 3 files changed, 26 insertions(+), 2 deletions(-)
-
-diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.cpp b/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-index 67ade5709f6..aa2a6bcec6b 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-@@ -361,6 +361,16 @@ void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
-   }
- }
- 
-+void ClassLoaderDataGraph::anonymous_or_hidden_classes_do(KlassClosure* klass_closure) {
-+  Thread* thread = Thread::current();
-+  for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
-+    if (cld->has_class_mirror_holder()) {
-+      Handle holder(thread, cld->holder_phantom());
-+      cld->classes_do(klass_closure);
-+    }
-+  }
-+}
-+
- void ClassLoaderDataGraph::classes_do(void f(Klass* const)) {
-   ClassLoaderDataGraphIterator iter;
-   while (ClassLoaderData* cld = iter.get_next()) {
-diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.hpp b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-index ebdb0bc2c8c..da712eaf55f 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-@@ -78,6 +78,10 @@ class ClassLoaderDataGraph : public AllStatic {
-   // for redefinition.  These classes are removed during the next class unloading.
-   // Walking the ClassLoaderDataGraph also includes hidden classes.
-   static void classes_do(KlassClosure* klass_closure);
-+
-+  // Enhanced class redefinition
-+  static void anonymous_or_hidden_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 90dfc1ae545..10407755457 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -2164,9 +2164,19 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
- 
-   {
-     MutexLocker mcld(ClassLoaderDataGraph_lock);
--    ClassLoaderDataGraph::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 or hidden 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_or_hidden_classes_do(&closure);
-   }
--  //ClassLoaderDataGraph::dictionary_classes_do(&closure);
- 
-   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
- 
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0032-Fix-compilation-problems.patch

@@ -1,39 +0,0 @@
-From c4941350aa7d3c5df3a20652f640fe446ff00c5c Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 15 May 2021 13:01:25 +0200
-Subject: [PATCH 32/45] Fix compilation problems
-
----
- src/hotspot/share/oops/instanceKlass.cpp                 | 2 +-
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 2 +-
- 2 files changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index bcb0da6301f..c5f37d42a9a 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -978,7 +978,7 @@ bool InstanceKlass::link_class_impl(TRAPS) {
-         set_init_state(linked);
-       }
-       // (DCEVM) Must check for old version in order to prevent infinite loops.
--      if (JvmtiExport::should_post_class_prepare()  && (!AllowEnhancedClassRedefinition || old_version() == NULL /* JVMTI deadlock otherwise */) {
-+      if (JvmtiExport::should_post_class_prepare()  && (!AllowEnhancedClassRedefinition || old_version() == NULL /* JVMTI deadlock otherwise */)) {
-         JvmtiExport::post_class_prepare(THREAD, this);
-       }
-     }
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 10407755457..e87d4452d31 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -708,7 +708,7 @@ void VM_EnhancedRedefineClasses::reinitializeJDKClasses() {
-       InstanceKlass* cur = _new_classes->at(i);
- 
-       if ((cur->name()->starts_with("java/") || cur->name()->starts_with("jdk/") || cur->name()->starts_with("sun/"))
--          && cur->name()->index_of_at(0, "$$") == -1) { // skip dynamic proxies
-+          && cur->name()->index_of_at(0, "$$", (int) strlen("$$")) == -1) { // skip dynamic proxies
- 
-         if (cur == vmClasses::ClassLoader_klass()) {
-           // ClassLoader.addClass method is cached in Universe, we must redefine
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0033-Fix-dcevm-issues-related-to-refactorization-of-Threa.patch

@@ -1,350 +0,0 @@
-From dad40d31ec8a1633189e70eff57ae5fd21544b20 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 20 Jun 2021 19:11:16 +0200
-Subject: [PATCH 33/45] Fix dcevm issues related to refactorization of Thread
- to JavaThread
-
----
- src/hotspot/share/cds/lambdaFormInvokers.cpp  |  1 +
- .../prims/jvmtiEnhancedRedefineClasses.cpp    | 72 +++++++++----------
- .../prims/jvmtiEnhancedRedefineClasses.hpp    | 12 ++--
- 3 files changed, 39 insertions(+), 46 deletions(-)
-
-diff --git a/src/hotspot/share/cds/lambdaFormInvokers.cpp b/src/hotspot/share/cds/lambdaFormInvokers.cpp
-index 5c058dc43ac..9de28f740ac 100644
---- a/src/hotspot/share/cds/lambdaFormInvokers.cpp
-+++ b/src/hotspot/share/cds/lambdaFormInvokers.cpp
-@@ -178,6 +178,7 @@ void LambdaFormInvokers::reload_class(char* name, ClassFileStream& st, TRAPS) {
-                                                    class_name,
-                                                    cld,
-                                                    cl_info,
-+                                                   false, // pick_newest
-                                                    CHECK);
- 
-   {
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index e87d4452d31..0aeeea4e7a4 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -23,7 +23,6 @@
-  */
- 
- #include "precompiled.hpp"
--#include "aot/aotLoader.hpp"
- #include "classfile/classFileParser.hpp"
- #include "classfile/classFileStream.hpp"
- #include "classfile/classLoadInfo.hpp"
-@@ -38,7 +37,7 @@
- #include "interpreter/rewriter.hpp"
- #include "logging/logStream.hpp"
- #include "memory/metadataFactory.hpp"
--#include "memory/metaspaceShared.hpp"
-+#include "cds/metaspaceShared.hpp"
- #include "memory/resourceArea.hpp"
- #include "memory/iterator.inline.hpp"
- #include "oops/fieldStreams.hpp"
-@@ -156,7 +155,7 @@ bool VM_EnhancedRedefineClasses::doit_prologue() {
- 
-   // We first load new class versions in the prologue, because somewhere down the
-   // call chain it is required that the current thread is a Java thread.
--  _res = load_new_class_versions(Thread::current());
-+  _res = load_new_class_versions(JavaThread::current());
- 
-   // prepare GC, lock heap
-   if (_res == JVMTI_ERROR_NONE && !VM_GC_Operation::doit_prologue()) {
-@@ -250,7 +249,6 @@ void VM_EnhancedRedefineClasses::root_oops_do(OopClosure *oopClosure) {
-   Universe::vm_global()->oops_do(oopClosure);
- 
-   Threads::oops_do(oopClosure, NULL);
--  AOT_ONLY(AOTLoader::oops_do(oopClosure);)
-   OopStorageSet::strong_oops_do(oopClosure);
- 
-   CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
-@@ -520,7 +518,7 @@ void VM_EnhancedRedefineClasses::doit() {
-                            // before the stack walk again.
- 
-   for (int i = 0; i < _new_classes->length(); i++) {
--    redefine_single_class(_new_classes->at(i), thread);
-+    redefine_single_class(thread, _new_classes->at(i));
-   }
- 
-   // Update possible redefinition of vm classes (like ClassLoader)
-@@ -535,7 +533,7 @@ void VM_EnhancedRedefineClasses::doit() {
- 
-   // Deoptimize all compiled code that depends on this class (do only once, because it clears whole cache)
-   // if (_max_redefinition_flags > Klass::ModifyClass) {
--    flush_dependent_code(thread);
-+    flush_dependent_code();
-   // }
- 
-   // Adjust constantpool caches for all classes that reference methods of the evolved class.
-@@ -692,7 +690,7 @@ void VM_EnhancedRedefineClasses::doit() {
-     assert(new_version->super() == NULL || new_version->super()->new_version() == NULL, "Super class must be newest version");
-   }
-   log_trace(redefine, class, obsolete, metadata)("calling check_class");
--  ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(check_class, thread);
-+  ClassLoaderData::the_null_class_loader_data()->dictionary()->classes_do(check_class);
- #ifdef PRODUCT
-   }
- #endif
-@@ -702,7 +700,7 @@ void VM_EnhancedRedefineClasses::doit() {
- 
- void VM_EnhancedRedefineClasses::reinitializeJDKClasses() {
-   if (!_new_classes->is_empty()) {
--    ResourceMark rm(Thread::current());
-+    ResourceMark rm(JavaThread::current());
- 
-     for (int i = 0; i < _new_classes->length(); i++) {
-       InstanceKlass* cur = _new_classes->at(i);
-@@ -712,7 +710,7 @@ void VM_EnhancedRedefineClasses::reinitializeJDKClasses() {
- 
-         if (cur == vmClasses::ClassLoader_klass()) {
-           // ClassLoader.addClass method is cached in Universe, we must redefine
--          Universe::reinitialize_loader_addClass_method(Thread::current());
-+          Universe::reinitialize_loader_addClass_method(JavaThread::current());
-           log_trace(redefine, class, obsolete, metadata)("Reinitialize ClassLoade addClass method cache.");
-         }
- 
-@@ -735,7 +733,7 @@ void VM_EnhancedRedefineClasses::reinitializeJDKClasses() {
-                                   cur,
-                                   signature,
-                                   vmSymbols::void_method_signature(),
--                                  Thread::current());
-+                                  JavaThread::current());
-           log_trace(redefine, class, obsolete, metadata)("Reregister natives of JDK class %s", cur->external_name());
-         }
-       }
-@@ -793,7 +791,7 @@ bool VM_EnhancedRedefineClasses::is_modifiable_class(oop klass_mirror) {
- 
-   // Cannot redefine or retransform an anonymous class.
-   // TODO: check if is correct in j15
--  if (InstanceKlass::cast(k)->is_unsafe_anonymous() || InstanceKlass::cast(k)->is_hidden()) {
-+  if (InstanceKlass::cast(k)->is_hidden()) {
-     return false;
-   }
-   return true;
-@@ -879,23 +877,15 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
- 
-     InstanceKlass* k;
- 
--    if (the_class->is_unsafe_anonymous() || the_class->is_hidden()) {
-+    if (the_class->is_hidden()) {
-       InstanceKlass* dynamic_host_class = NULL;
--      InstanceKlass* unsafe_anonymous_host = NULL;
- 
-       if (the_class->is_hidden()) {
-         log_debug(redefine, class, load)("loading hidden class %s", the_class->name()->as_C_string());
-         dynamic_host_class = the_class->nest_host(THREAD);
-       }
- 
--      if (the_class->is_unsafe_anonymous()) {
--        log_debug(redefine, class, load)("loading usafe anonymous %s", the_class->name()->as_C_string());
--        unsafe_anonymous_host = the_class->unsafe_anonymous_host();
--      }
--
-       ClassLoadInfo cl_info(protection_domain,
--                            unsafe_anonymous_host,
--                            NULL,     // cp_patches
-                             dynamic_host_class,     // dynamic_nest_host
-                             Handle(), // classData
-                             the_class->is_hidden(),    // is_hidden
-@@ -1143,7 +1133,7 @@ int VM_EnhancedRedefineClasses::calculate_redefinition_flags(InstanceKlass* new_
-   Array<Method*>* k_new_methods(new_class->methods());
-   int n_old_methods = k_old_methods->length();
-   int n_new_methods = k_new_methods->length();
--  Thread* thread = Thread::current();
-+  JavaThread* thread = JavaThread::current();
- 
-   int ni = 0;
-   int oi = 0;
-@@ -1491,8 +1481,8 @@ void VM_EnhancedRedefineClasses::rollback() {
- // Rewrite faster byte-codes back to their slower equivalent. Undoes rewriting happening in templateTable_xxx.cpp
- // The reason is that once we zero cpool caches, we need to re-resolve all entries again. Faster bytecodes do not
- // do that, they assume that cache entry is resolved already.
--void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method, TRAPS) {
--  RawBytecodeStream bcs(methodHandle(THREAD, method));
-+void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method) {
-+  RawBytecodeStream bcs(methodHandle(Thread::current(), method));
-   Bytecodes::Code code;
-   Bytecodes::Code java_code;
-   while (!bcs.is_last_bytecode()) {
-@@ -1535,10 +1525,10 @@ void VM_EnhancedRedefineClasses::unpatch_bytecode(Method* method, TRAPS) {
-       assert(code2 == Bytecodes::_fast_igetfield ||
-              code2 == Bytecodes::_fast_agetfield ||
-              code2 == Bytecodes::_fast_fgetfield, "");
--        *(bcp + 1) = Bytecodes::java_code(code2);
--      }
-+      *(bcp + 1) = Bytecodes::java_code(code2);
-     }
-   }
-+}
- 
- // Unevolving classes may point to old methods directly
- // from their constant pool caches, itables, and/or vtables. We
-@@ -1559,9 +1549,11 @@ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
-   constantPoolHandle other_cp = constantPoolHandle(_thread, ik->constants());
- 
-   // Update host klass of anonymous classes (for example, produced by lambdas) to newest version.
-+  /*
-   if (ik->is_unsafe_anonymous() && ik->unsafe_anonymous_host()->new_version() != NULL) {
-     ik->set_unsafe_anonymous_host(InstanceKlass::cast(ik->unsafe_anonymous_host()->newest_version()));
-   }
-+  */
- 
-   // FIXME: check new nest_host for hidden
- 
-@@ -1596,7 +1588,7 @@ void VM_EnhancedRedefineClasses::ClearCpoolCacheAndUnpatch::do_klass(Klass* k) {
- 
-   // If bytecode rewriting is enabled, we also need to unpatch bytecode to force resolution of zeroed entries
-   if (RewriteBytecodes) {
--    ik->methods_do(unpatch_bytecode, _thread);
-+    ik->methods_do(unpatch_bytecode);
-   }
- }
- 
-@@ -1628,7 +1620,7 @@ void VM_EnhancedRedefineClasses::MethodDataCleaner::do_klass(Klass* k) {
- }
- 
- 
--void VM_EnhancedRedefineClasses::update_jmethod_ids(TRAPS) {
-+void VM_EnhancedRedefineClasses::update_jmethod_ids(Thread* current) {
-   for (int j = 0; j < _matching_methods_length; ++j) {
-     Method* old_method = _matching_old_methods[j];
-     jmethodID jmid = old_method->find_jmethod_id_or_null();
-@@ -1639,10 +1631,10 @@ void VM_EnhancedRedefineClasses::update_jmethod_ids(TRAPS) {
- 
-     if (jmid != NULL) {
-       // There is a jmethodID, change it to point to the new method
--      methodHandle new_method_h(THREAD, _matching_new_methods[j]);
-+      methodHandle new_method_h(current, _matching_new_methods[j]);
- 
-       if (old_method->new_version() == NULL) {
--        methodHandle old_method_h(THREAD, _matching_old_methods[j]);
-+        methodHandle old_method_h(current, _matching_old_methods[j]);
-         jmethodID new_jmethod_id = Method::make_jmethod_id(old_method_h->method_holder()->class_loader_data(), old_method_h());
-         bool result = InstanceKlass::cast(old_method_h->method_holder())->update_jmethod_id(old_method_h(), new_jmethod_id);
-       } else {
-@@ -1864,7 +1856,7 @@ void VM_EnhancedRedefineClasses::mark_dependent_code(InstanceKlass* ik) {
- // subsequent calls to RedefineClasses need only throw away code
- // that depends on the class.
- //
--void VM_EnhancedRedefineClasses::flush_dependent_code(TRAPS) {
-+void VM_EnhancedRedefineClasses::flush_dependent_code() {
-   assert_locked_or_safepoint(Compile_lock);
- 
-   // All dependencies have been recorded from startup or this is a second or
-@@ -1959,9 +1951,9 @@ void VM_EnhancedRedefineClasses::compute_added_deleted_matching_methods() {
- //      a helper method to be specified. The interesting parameters
- //      that we would like to pass to the helper method are saved in
- //      static global fields in the VM operation.
--void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_oop, TRAPS) {
-+void VM_EnhancedRedefineClasses::redefine_single_class(Thread* current, InstanceKlass* new_class_oop) {
- 
--  HandleMark hm(THREAD);   // make sure handles from this call are freed
-+  HandleMark hm(current);   // make sure handles from this call are freed
- 
-   InstanceKlass* new_class = new_class_oop;
-   InstanceKlass* the_class = InstanceKlass::cast(new_class_oop->old_version());
-@@ -1980,7 +1972,7 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
- 
-   // track number of methods that are EMCP for add_previous_version() call below
-   check_methods_and_mark_as_obsolete();
--  update_jmethod_ids(THREAD);
-+  update_jmethod_ids(current);
- 
-   _any_class_has_resolved_methods = the_class->has_resolved_methods() || _any_class_has_resolved_methods;
- 
-@@ -2002,14 +1994,14 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
-   */
- 
-   {
--    ResourceMark rm(THREAD);
-+    ResourceMark rm(current);
-     // increment the classRedefinedCount field in the_class and in any
-     // direct and indirect subclasses of the_class
--    increment_class_counter(new_class, THREAD);
-+    increment_class_counter(current, new_class);
-     log_info(redefine, class, load)
-       ("redefined name=%s, count=%d (avail_mem=" UINT64_FORMAT "K)",
-        new_class->external_name(), java_lang_Class::classRedefinedCount(new_class->java_mirror()), os::available_memory() >> 10);
--    Events::log_redefinition(THREAD, "redefined class name=%s, count=%d",
-+    Events::log_redefinition(current, "redefined class name=%s, count=%d",
-                              new_class->external_name(),
-                              java_lang_Class::classRedefinedCount(new_class->java_mirror()));
-   }
-@@ -2018,21 +2010,21 @@ void VM_EnhancedRedefineClasses::redefine_single_class(InstanceKlass* new_class_
- 
- // Increment the classRedefinedCount field in the specific InstanceKlass
- // and in all direct and indirect subclasses.
--void VM_EnhancedRedefineClasses::increment_class_counter(InstanceKlass *ik, TRAPS) {
-+void VM_EnhancedRedefineClasses::increment_class_counter(Thread* current, InstanceKlass *ik) {
-   oop class_mirror = ik->old_version()->java_mirror();
-   Klass* class_oop = java_lang_Class::as_Klass(class_mirror);
-   int new_count = java_lang_Class::classRedefinedCount(class_mirror) + 1;
-   java_lang_Class::set_classRedefinedCount(ik->java_mirror(), new_count);
- }
- 
--void VM_EnhancedRedefineClasses::check_class(InstanceKlass* ik, TRAPS) {
-+void VM_EnhancedRedefineClasses::check_class(InstanceKlass* ik) {
-   if (ik->is_instance_klass() && ik->old_version() != NULL) {
--    HandleMark hm(THREAD);
-+    HandleMark hm(Thread::current());
- 
-     assert(ik->new_version() == NULL, "must be latest version in system dictionary");
- 
-     if (ik->vtable_length() > 0) {
--      ResourceMark rm(THREAD);
-+      ResourceMark rm(Thread::current());
-       assert(ik->vtable().check_no_old_or_obsolete_entries(), "old method found");
-       ik->vtable().verify(tty, true);
-     }
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-index d0d2f78aa62..252287a3697 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.hpp
-@@ -122,7 +122,7 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
-   static void mark_as_scavengable(nmethod* nm);
-   static void unregister_nmethod_g1(nmethod* nm);
-   static void register_nmethod_g1(nmethod* nm);
--  static void unpatch_bytecode(Method* method, TRAPS);
-+  static void unpatch_bytecode(Method* method);
- 
-   void root_oops_do(OopClosure *oopClosure);
- 
-@@ -131,28 +131,28 @@ class VM_EnhancedRedefineClasses: public VM_GC_Operation {
-   void compute_added_deleted_matching_methods();
- 
-   // Change jmethodIDs to point to the new methods
--  void update_jmethod_ids(TRAPS);
-+  void update_jmethod_ids(Thread* current);
- 
-   // marking methods as old and/or obsolete
-   void check_methods_and_mark_as_obsolete();
-   void transfer_old_native_function_registrations(InstanceKlass* the_class);
- 
-   // Install the redefinition of a class
--  void redefine_single_class(InstanceKlass* new_class_oop, TRAPS);
-+  void redefine_single_class(Thread* current, InstanceKlass* new_class_oop);
- 
-   // Increment the classRedefinedCount field in the specific InstanceKlass
-   // and in all direct and indirect subclasses.
--  void increment_class_counter(InstanceKlass *ik, TRAPS);
-+  void increment_class_counter(Thread* current, InstanceKlass *ik);
- 
-   void mark_dependent_code(InstanceKlass* ik);
- 
--  void flush_dependent_code(TRAPS);
-+  void flush_dependent_code();
- 
-   u8 next_id();
- 
-   void reinitializeJDKClasses();
- 
--  static void check_class(InstanceKlass* k_oop, TRAPS);
-+  static void check_class(InstanceKlass* k_oop);
- 
-   static void dump_methods();
- 
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0034-Fix-init_method_MemberName-after-Thread-to-JavaThrea.patch

@@ -1,142 +0,0 @@
-From 7fcef1a84c37c568c0afafb8cb22303efda68f0d Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sun, 20 Jun 2021 19:42:51 +0200
-Subject: [PATCH 34/45] Fix init_method_MemberName after Thread to JavaThread
- refactorization
-
----
- src/hotspot/share/interpreter/linkResolver.cpp    | 14 ++++++++++----
- src/hotspot/share/interpreter/linkResolver.hpp    |  3 ++-
- src/hotspot/share/oops/instanceKlass.cpp          | 15 ---------------
- src/hotspot/share/oops/instanceKlass.hpp          |  1 -
- .../share/prims/jvmtiEnhancedRedefineClasses.cpp  | 11 +++++++++--
- 5 files changed, 21 insertions(+), 23 deletions(-)
-
-diff --git a/src/hotspot/share/interpreter/linkResolver.cpp b/src/hotspot/share/interpreter/linkResolver.cpp
-index 74a6af13ea4..78c9624a18b 100644
---- a/src/hotspot/share/interpreter/linkResolver.cpp
-+++ b/src/hotspot/share/interpreter/linkResolver.cpp
-@@ -131,14 +131,14 @@ void CallInfo::set_common(Klass* resolved_klass,
- }
- 
- // utility query for unreflecting a method
--CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
-+CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, Thread* thread) {
-   Klass* resolved_method_holder = resolved_method->method_holder();
-   if (resolved_klass == NULL) { // 2nd argument defaults to holder of 1st
-     resolved_klass = resolved_method_holder;
-   }
-   _resolved_klass  = resolved_klass;
--  _resolved_method = methodHandle(THREAD, resolved_method);
--  _selected_method = methodHandle(THREAD, resolved_method);
-+  _resolved_method = methodHandle(thread, resolved_method);
-+  _selected_method = methodHandle(thread, resolved_method);
-   // classify:
-   CallKind kind = CallInfo::unknown_kind;
-   int index = resolved_method->vtable_index();
-@@ -179,7 +179,9 @@ CallInfo::CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS) {
-   _call_index = index;
-   _resolved_appendix = Handle();
-   // Find or create a ResolvedMethod instance for this Method*
--  set_resolved_method_name(CHECK);
-+  if (thread->is_Java_thread()) { // exclude DCEVM VM thread
-+    set_resolved_method_name(thread->as_Java_thread());
-+  }
- 
-   DEBUG_ONLY(verify());
- }
-@@ -190,6 +192,10 @@ void CallInfo::set_resolved_method_name(TRAPS) {
-   _resolved_method_name = Handle(THREAD, rmethod_name);
- }
- 
-+void CallInfo::set_resolved_method_name_dcevm(oop rmethod_name, Thread* thread) {
-+  _resolved_method_name = Handle(thread, rmethod_name);
-+}
-+
- #ifdef ASSERT
- void CallInfo::verify() {
-   switch (call_kind()) {  // the meaning and allowed value of index depends on kind
-diff --git a/src/hotspot/share/interpreter/linkResolver.hpp b/src/hotspot/share/interpreter/linkResolver.hpp
-index 9eeb10cc6fd..871eaab7464 100644
---- a/src/hotspot/share/interpreter/linkResolver.hpp
-+++ b/src/hotspot/share/interpreter/linkResolver.hpp
-@@ -91,7 +91,7 @@ class CallInfo : public StackObj {
-   // utility to extract an effective CallInfo from a method and an optional receiver limit
-   // does not queue the method for compilation.  This also creates a ResolvedMethodName
-   // object for the resolved_method.
--  CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS);
-+  CallInfo(Method* resolved_method, Klass* resolved_klass, Thread* thread);
- 
-   Klass*  resolved_klass() const                 { return _resolved_klass; }
-   Method* resolved_method() const                { return _resolved_method(); }
-@@ -100,6 +100,7 @@ class CallInfo : public StackObj {
-   Handle       resolved_method_name() const      { return _resolved_method_name; }
-   // Materialize a java.lang.invoke.ResolvedMethodName for this resolved_method
-   void     set_resolved_method_name(TRAPS);
-+  void     set_resolved_method_name_dcevm(oop rmethod_name, Thread* thread);
- 
-   BasicType    result_type() const               { return selected_method()->result_type(); }
-   CallKind     call_kind() const                 { return _call_kind; }
-diff --git a/src/hotspot/share/oops/instanceKlass.cpp b/src/hotspot/share/oops/instanceKlass.cpp
-index c5f37d42a9a..9920e7fb25d 100644
---- a/src/hotspot/share/oops/instanceKlass.cpp
-+++ b/src/hotspot/share/oops/instanceKlass.cpp
-@@ -1643,21 +1643,6 @@ void InstanceKlass::methods_do(void f(Method* method)) {
-   }
- }
- 
--void InstanceKlass::methods_do(void f(Method* method, TRAPS), TRAPS) {
--  // Methods aren't stable until they are loaded.  This can be read outside
--  // a lock through the ClassLoaderData for profiling
--  if (!is_loaded()) {
--    return;
--  }
--
--  int len = methods()->length();
--  for (int index = 0; index < len; index++) {
--    Method* m = methods()->at(index);
--    assert(m->is_method(), "must be method");
--    f(m, CHECK);
--  }
--}
--
- //  (DCEVM) Update information contains mapping of fields from old class to the new class.
- //  Info is stored on HEAP, you need to call clear_update_information to free the space.
- void InstanceKlass::store_update_information(GrowableArray<int> &values) {
-diff --git a/src/hotspot/share/oops/instanceKlass.hpp b/src/hotspot/share/oops/instanceKlass.hpp
-index 317a006a4ec..36587031fec 100644
---- a/src/hotspot/share/oops/instanceKlass.hpp
-+++ b/src/hotspot/share/oops/instanceKlass.hpp
-@@ -1017,7 +1017,6 @@ public:
-   void clear_update_information();
- 
-   void methods_do(void f(Method* method));
--  void methods_do(void f(Method* method, TRAPS), TRAPS);
-   void array_klasses_do(void f(Klass* k));
-   void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
- 
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 0aeeea4e7a4..e7f26b7d08e 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -292,8 +292,15 @@ class ChangePointersOopClosure : public BasicOopIterateClosure {
-           // Note: we might set NULL at this point, which should force AbstractMethodError at runtime
-           Thread *thread = Thread::current();
-           CallInfo info(new_method, newest, thread);
--          Handle objHandle(thread, obj);
--          MethodHandles::init_method_MemberName(objHandle, info);
-+          oop resolved_method = ResolvedMethodTable::find_method(info.resolved_method());
-+          if (resolved_method != NULL) {
-+            info.set_resolved_method_name_dcevm(resolved_method, thread);
-+            Handle objHandle(thread, obj);
-+            MethodHandles::init_method_MemberName(objHandle, info);
-+          } else {
-+            assert(0, "Must be resolved");
-+            java_lang_invoke_MemberName::set_method(obj, NULL);
-+          }
-         } else {
-           java_lang_invoke_MemberName::set_method(obj, NULL);
-         }
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0035-Fix-implicit-conversion-of-NULL-constant-to-bool.patch

@@ -1,25 +0,0 @@
-From e16371268f8ba1c752dc61635a09c94e978f5117 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Mon, 21 Jun 2021 20:44:17 +0200
-Subject: [PATCH 35/45] Fix "implicit conversion of NULL constant to 'bool'"
-
----
- src/hotspot/share/prims/jvmtiRedefineClasses.cpp | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/prims/jvmtiRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
-index 87b3b5f47ce..6915a09cf85 100644
---- a/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiRedefineClasses.cpp
-@@ -1390,7 +1390,7 @@ jvmtiError VM_RedefineClasses::load_new_class_versions() {
-                                                       the_class->name(),
-                                                       the_class->class_loader_data(),
-                                                       cl_info,
--                                                      NULL,
-+                                                      false,
-                                                       THREAD);
- 
-     // Clear class_being_redefined just to be sure.
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0036-Fix-pass-SystemDictionary-resolve_from_stream-cl_inf.patch

@@ -1,35 +0,0 @@
-From 4d7390cedc3d06281f6a89f12b469108f11aab42 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Wed, 30 Jun 2021 18:30:00 +0200
-Subject: [PATCH 36/45] Fix, pass SystemDictionary::resolve_from_stream cl_info
- param
-
----
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 8 +++++++-
- 1 file changed, 7 insertions(+), 1 deletion(-)
-
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index e7f26b7d08e..4d145f30100 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -920,10 +920,16 @@ jvmtiError VM_EnhancedRedefineClasses::load_new_class_versions(TRAPS) {
-       }
- 
-     } else {
-+      ClassLoadInfo cl_info(protection_domain,
-+                            NULL,     // dynamic_nest_host
-+                            Handle(), // classData
-+                            false,    // is_hidden
-+                            !the_class->is_non_strong_hidden(),    // is_strong_hidden
-+                            true);    // FIXME: check if correct. can_access_vm_annotations
-       k = SystemDictionary::resolve_from_stream(&st,
-                                                 the_class_sym,
-                                                 the_class_loader,
--                                                protection_domain,
-+                                                cl_info,
-                                                 the_class,
-                                                 THREAD);
-     }
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0037-Search-for-affected-classes-in-all-initialized-class.patch

@@ -1,113 +0,0 @@
-From 24fe3ebd655068b819a437af62d40c2ee9ed7171 Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Wed, 30 Jun 2021 18:50:38 +0200
-Subject: [PATCH 37/45] Search for affected classes in all initialized classes
- in cld
-
-Fix also case when lambda interface is redefined. Lambda class is
-missing in cld dictionary since it is hidden since j17
----
- src/hotspot/share/classfile/classLoaderData.cpp     | 10 ++++++++++
- src/hotspot/share/classfile/classLoaderData.hpp     |  1 +
- .../share/classfile/classLoaderDataGraph.cpp        | 11 ++++-------
- .../share/classfile/classLoaderDataGraph.hpp        |  2 +-
- .../share/prims/jvmtiEnhancedRedefineClasses.cpp    | 13 ++++---------
- 5 files changed, 20 insertions(+), 17 deletions(-)
-
-diff --git a/src/hotspot/share/classfile/classLoaderData.cpp b/src/hotspot/share/classfile/classLoaderData.cpp
-index 65ce4c4af8c..1c51e83e86e 100644
---- a/src/hotspot/share/classfile/classLoaderData.cpp
-+++ b/src/hotspot/share/classfile/classLoaderData.cpp
-@@ -337,6 +337,16 @@ void ClassLoaderData::classes_do(KlassClosure* klass_closure) {
-   }
- }
- 
-+void ClassLoaderData::initialized_classes_do(KlassClosure* klass_closure) {
-+  // Lock-free access requires load_acquire
-+  for (Klass* k = Atomic::load_acquire(&_klasses); k != NULL; k = k->next_link()) {
-+    if (k->is_instance_klass() && InstanceKlass::cast(k)->is_initialized()) {
-+      klass_closure->do_klass(k);
-+    }
-+    assert(k != k->next_link(), "no loops!");
-+  }
-+}
-+
- void ClassLoaderData::classes_do(void f(Klass * const)) {
-   // Lock-free access requires load_acquire
-   for (Klass* k = Atomic::load_acquire(&_klasses); k != NULL; k = k->next_link()) {
-diff --git a/src/hotspot/share/classfile/classLoaderData.hpp b/src/hotspot/share/classfile/classLoaderData.hpp
-index bda39f3e353..28fc9060e03 100644
---- a/src/hotspot/share/classfile/classLoaderData.hpp
-+++ b/src/hotspot/share/classfile/classLoaderData.hpp
-@@ -272,6 +272,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
-   void oops_do(OopClosure* f, int claim_value, bool clear_modified_oops = false);
- 
-   void classes_do(KlassClosure* klass_closure);
-+  void initialized_classes_do(KlassClosure* klass_closure);
-   Klass* klasses() { return _klasses; }
- 
-   JNIMethodBlock* jmethod_ids() const              { return _jmethod_ids; }
-diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.cpp b/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-index aa2a6bcec6b..f2394f72dbd 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.cpp
-@@ -361,13 +361,10 @@ void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
-   }
- }
- 
--void ClassLoaderDataGraph::anonymous_or_hidden_classes_do(KlassClosure* klass_closure) {
--  Thread* thread = Thread::current();
--  for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
--    if (cld->has_class_mirror_holder()) {
--      Handle holder(thread, cld->holder_phantom());
--      cld->classes_do(klass_closure);
--    }
-+void ClassLoaderDataGraph::initialized_classes_do(KlassClosure* klass_closure) {
-+  ClassLoaderDataGraphIterator iter;
-+  while (ClassLoaderData* cld = iter.get_next()) {
-+    cld->initialized_classes_do(klass_closure);
-   }
- }
- 
-diff --git a/src/hotspot/share/classfile/classLoaderDataGraph.hpp b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-index da712eaf55f..ff391ec74fc 100644
---- a/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-+++ b/src/hotspot/share/classfile/classLoaderDataGraph.hpp
-@@ -80,7 +80,7 @@ class ClassLoaderDataGraph : public AllStatic {
-   static void classes_do(KlassClosure* klass_closure);
- 
-   // Enhanced class redefinition
--  static void anonymous_or_hidden_classes_do(KlassClosure* klass_closure);
-+  static void initialized_classes_do(KlassClosure* klass_closure);
- 
-   static void classes_do(void f(Klass* const));
-   static void methods_do(void f(Method*));
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 4d145f30100..8615806ac98 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -2170,17 +2170,12 @@ jvmtiError VM_EnhancedRedefineClasses::find_sorted_affected_classes(TRAPS) {
-   {
-     MutexLocker mcld(ClassLoaderDataGraph_lock);
- 
--    // 0. we can't use ClassLoaderDataGraph::classes_do since classes can be uninitialized in cld,
--    // fully initialized class is in system dictionary
-+    // We can't use ClassLoaderDataGraph::classes_do since classes can be uninitialized in cld,
-+    // fully initialized class is in system dictionary, but hidden classes are excluded. Therefore
-+    // we use special method iterating over initialized classes only
-     // ClassLoaderDataGraph::classes_do(&closure);
- 
--    // 1. Scan over dictionaries
--    ClassLoaderDataGraph::dictionary_classes_do(&closure);
--
--    // 2. Anonymous or hidden 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_or_hidden_classes_do(&closure);
-+    ClassLoaderDataGraph::initialized_classes_do(&closure);
-   }
- 
-   log_trace(redefine, class, load)("%d classes affected", _affected_klasses->length());
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0038-Fix-compilation-issue.patch

@@ -1,27 +0,0 @@
-From 3e62ad1914f202d2d3fe907036924e181cd60fcb Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Wed, 30 Jun 2021 18:58:47 +0200
-Subject: [PATCH 38/45] Fix compilation issue
-
----
- src/hotspot/share/interpreter/linkResolver.cpp | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/src/hotspot/share/interpreter/linkResolver.cpp b/src/hotspot/share/interpreter/linkResolver.cpp
-index 78c9624a18b..28dccd0face 100644
---- a/src/hotspot/share/interpreter/linkResolver.cpp
-+++ b/src/hotspot/share/interpreter/linkResolver.cpp
-@@ -562,8 +562,8 @@ void LinkResolver::check_method_accessability(Klass* ref_klass,
-   // We'll check for the method name first, as that's most likely
-   // to be false (so we'll short-circuit out of these tests).
-   if (sel_method->name() == vmSymbols::clone_name() &&
--      ( !AllowEnhancedClassRedefinition && sel_klass == vmClasses::Object_klass() ||
--      AllowEnhancedClassRedefinition && sel_klass->newest_version() == vmClasses::Object_klass()->newest_version()) &&
-+      ( (!AllowEnhancedClassRedefinition && sel_klass == vmClasses::Object_klass()) ||
-+        (AllowEnhancedClassRedefinition && sel_klass->newest_version() == vmClasses::Object_klass()->newest_version()) ) &&
-       resolved_klass->is_array_klass()) {
-     // We need to change "protected" to "public".
-     assert(flags.is_protected(), "clone not protected?");
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0039-Remove-duplicated-lambdaFormInvokers.cpp.patch

@@ -1,171 +0,0 @@
-From 4cfb8eb8caa9b13f54f21cdd34b4d761b2b488cc Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Tue, 27 Jul 2021 21:32:51 +0200
-Subject: [PATCH 39/45] Remove duplicated lambdaFormInvokers.cpp
-
----
- .../share/classfile/lambdaFormInvokers.cpp    | 152 ------------------
- 1 file changed, 152 deletions(-)
- delete mode 100644 src/hotspot/share/classfile/lambdaFormInvokers.cpp
-
-diff --git a/src/hotspot/share/classfile/lambdaFormInvokers.cpp b/src/hotspot/share/classfile/lambdaFormInvokers.cpp
-deleted file mode 100644
-index 281de58b482..00000000000
---- a/src/hotspot/share/classfile/lambdaFormInvokers.cpp
-+++ /dev/null
-@@ -1,152 +0,0 @@
--/*
-- * 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.
-- *
-- * 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.
-- *
-- */
--
--#include "precompiled.hpp"
--#include "classfile/classLoadInfo.hpp"
--#include "classfile/classFileStream.hpp"
--#include "classfile/javaClasses.inline.hpp"
--#include "classfile/klassFactory.hpp"
--#include "classfile/lambdaFormInvokers.hpp"
--#include "classfile/symbolTable.hpp"
--#include "classfile/systemDictionary.hpp"
--#include "classfile/systemDictionaryShared.hpp"
--#include "classfile/vmClasses.hpp"
--#include "classfile/vmSymbols.hpp"
--#include "logging/log.hpp"
--#include "memory/oopFactory.hpp"
--#include "memory/metaspaceShared.hpp"
--#include "memory/resourceArea.hpp"
--#include "oops/instanceKlass.hpp"
--#include "oops/klass.hpp"
--#include "oops/objArrayKlass.hpp"
--#include "oops/objArrayOop.hpp"
--#include "oops/oop.inline.hpp"
--#include "oops/typeArrayOop.inline.hpp"
--#include "runtime/handles.inline.hpp"
--#include "runtime/javaCalls.hpp"
--
--GrowableArray<char*>* LambdaFormInvokers::_lambdaform_lines = NULL;
--
--void LambdaFormInvokers::append(char* line) {
--  if (_lambdaform_lines == NULL) {
--    _lambdaform_lines = new GrowableArray<char*>(100);
--  }
--  _lambdaform_lines->append(line);
--}
--
--void LambdaFormInvokers::regenerate_holder_classes(TRAPS) {
--  assert(_lambdaform_lines != NULL, "Bad List");
--  ResourceMark rm(THREAD);
--
--  Symbol* cds_name  = vmSymbols::jdk_internal_misc_CDS();
--  Klass*  cds_klass = SystemDictionary::resolve_or_null(cds_name, THREAD);
--  guarantee(cds_klass != NULL, "jdk/internal/misc/CDS must exist!");
--
--  int len = _lambdaform_lines->length();
--  objArrayHandle list_lines = oopFactory::new_objArray_handle(vmClasses::String_klass(), len, CHECK);
--  for (int i = 0; i < len; i++) {
--    Handle h_line = java_lang_String::create_from_str(_lambdaform_lines->at(i), CHECK);
--    list_lines->obj_at_put(i, h_line());
--  }
--
--  //
--  // Object[] CDS.generateLambdaFormHolderClasses(String[] lines)
--  // the returned Object[] layout:
--  //   name, byte[], name, byte[] ....
--  Symbol* method = vmSymbols::generateLambdaFormHolderClasses();
--  Symbol* signrs = vmSymbols::generateLambdaFormHolderClasses_signature();
--
--  JavaValue result(T_OBJECT);
--  JavaCalls::call_static(&result, cds_klass, method, signrs, list_lines, THREAD);
--
--  if (HAS_PENDING_EXCEPTION) {
--    log_info(cds)("%s: %s", THREAD->pending_exception()->klass()->external_name(),
--                            java_lang_String::as_utf8_string(java_lang_Throwable::message(THREAD->pending_exception())));
--    CLEAR_PENDING_EXCEPTION;
--    return;
--  }
--
--  objArrayHandle h_array(THREAD, (objArrayOop)result.get_oop());
--  int sz = h_array->length();
--  assert(sz % 2 == 0 && sz >= 2, "Must be even size of length");
--  for (int i = 0; i < sz; i+= 2) {
--    Handle h_name(THREAD, h_array->obj_at(i));
--    typeArrayHandle h_bytes(THREAD, (typeArrayOop)h_array->obj_at(i+1));
--    assert(h_name != NULL, "Class name is NULL");
--    assert(h_bytes != NULL, "Class bytes is NULL");
--
--    char *class_name = java_lang_String::as_utf8_string(h_name());
--    int len = h_bytes->length();
--    // make a copy of class bytes so GC will not affect us.
--    char *buf = resource_allocate_bytes(THREAD, len);
--    memcpy(buf, (char*)h_bytes->byte_at_addr(0), len);
--    ClassFileStream st((u1*)buf, len, NULL, ClassFileStream::verify);
--
--    reload_class(class_name, st, THREAD);
--    // free buf
--    resource_free_bytes(buf, len);
--
--    if (HAS_PENDING_EXCEPTION) {
--      log_info(cds)("Exception happened: %s", PENDING_EXCEPTION->klass()->name()->as_C_string());
--      log_info(cds)("Could not create InstanceKlass for class %s", class_name);
--      CLEAR_PENDING_EXCEPTION;
--      return;
--    }
--  }
--}
--
--// class_handle - the class name, bytes_handle - the class bytes
--void LambdaFormInvokers::reload_class(char* name, ClassFileStream& st, TRAPS) {
--  Symbol* class_name = SymbolTable::new_symbol((const char*)name);
--  // the class must exist
--  Klass* klass = SystemDictionary::resolve_or_null(class_name, THREAD);
--  if (klass == NULL) {
--    log_info(cds)("Class %s not present, skip", name);
--    return;
--  }
--  assert(klass->is_instance_klass(), "Should be");
--
--  ClassLoaderData* cld = ClassLoaderData::the_null_class_loader_data();
--  Handle protection_domain;
--  ClassLoadInfo cl_info(protection_domain);
--
--  InstanceKlass* result = KlassFactory::create_from_stream(&st,
--                                                   class_name,
--                                                   cld,
--                                                   cl_info,
--                                                   false,
--                                                   CHECK);
--
--  {
--    MutexLocker mu_r(THREAD, Compile_lock); // add_to_hierarchy asserts this.
--    SystemDictionary::add_to_hierarchy(result);
--  }
--  // new class not linked yet.
--  MetaspaceShared::try_link_class(THREAD, result);
--  assert(!HAS_PENDING_EXCEPTION, "Invariant");
--
--  // exclude the existing class from dump
--  SystemDictionaryShared::set_excluded(InstanceKlass::cast(klass));
--  log_info(cds, lambda)("Replaced class %s, old: %p  new: %p", name, klass, result);
--}
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0040-JBR-3867-update-keys-of-jvmti-TAG-map-after-redefini.patch

@@ -1,222 +0,0 @@
-From 92651c5d109896613e14792aa96ed5226a797f9b 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 40/45] 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 a3fc430e1d1..ab2e663b95d 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 c07bdac2922..7e3070d7d1d 100644
---- a/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
-+++ b/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
-@@ -477,6 +477,14 @@ 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) {
-@@ -486,6 +494,18 @@ 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 bc7ddb660bf..f8cb8e36f17 100644
---- a/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.c
-+++ b/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.c
-@@ -712,3 +712,32 @@ 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 c3700f8c743..35c77e4adbf 100644
---- a/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.h
-+++ b/src/jdk.jdwp.agent/share/native/libjdwp/commonRef.h
-@@ -43,4 +43,6 @@ 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 2403c5273ba..b4a5ad183e0 100644
---- a/src/jdk.jdwp.agent/share/native/libjdwp/util.c
-+++ b/src/jdk.jdwp.agent/share/native/libjdwp/util.c
-@@ -43,6 +43,7 @@ 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
-@@ -285,6 +286,8 @@ util_initialize(JNIEnv *env)
-             }
-         }
- 
-+        gdata->isEnhancedClassRedefinitionEnabled = isEnhancedClassRedefinitionEnabled(env);
-+
-     } END_WITH_LOCAL_REFS(env);
- 
- }
-@@ -1701,6 +1704,36 @@ 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 f62b5c409f0..6de8f17bb23 100644
---- a/src/jdk.jdwp.agent/share/native/libjdwp/util.h
-+++ b/src/jdk.jdwp.agent/share/native/libjdwp/util.h
-@@ -133,6 +133,9 @@ 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
-

jb/project/tools/patches/dcevm/0041-JBR-3867-fix-msvc-compilation-issue-with-non-const-a.patch

@@ -1,54 +0,0 @@
-From 7cfd70e1e43bca677b9827a5a7643bb604e6ae38 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 41/45] 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 7e3070d7d1d..669fac7cb5b 100644
---- a/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
-+++ b/src/jdk.jdwp.agent/share/native/libjdwp/VirtualMachineImpl.c
-@@ -477,11 +477,16 @@ 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);
-             }
-         }
- 
-@@ -495,7 +500,7 @@ 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 */
-@@ -504,6 +509,7 @@ redefineClasses(PacketInputStream *in, PacketOutputStream *out)
-                         break;
-                     }
-                 }
-+                jvmtiDeallocate((void*) classIds);
-             }
- 
-         }
--- 
-2.23.0
-

jb/project/tools/patches/dcevm/0042-Attempt-to-fix-JBR-3887.patch

@@ -1,31 +0,0 @@
-From d41ca807dcf4f192bc730c577acb5d2bff0aa3f7 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 42/45] 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 ab2e663b95d..698d32a7228 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
-

jb/project/tools/patches/dcevm/0043-JBR-3937-Fix-crashes-in-C1-C2-compilers.patch

@@ -1,180 +0,0 @@
-From 91534f381bf08471b7e6e5064d561fb75e2890c6 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 43/45] 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 | 38 ++++++++++++++++++--
- src/hotspot/share/compiler/compileBroker.hpp |  6 ++++
- src/hotspot/share/prims/jvmtiEnv.cpp         |  7 ++++
- src/hotspot/share/runtime/mutexLocker.cpp    |  3 ++
- src/hotspot/share/runtime/mutexLocker.hpp    |  1 +
- 5 files changed, 53 insertions(+), 2 deletions(-)
-
-diff --git a/src/hotspot/share/compiler/compileBroker.cpp b/src/hotspot/share/compiler/compileBroker.cpp
-index aaf8e4b1f1e..878bc265d2f 100644
---- a/src/hotspot/share/compiler/compileBroker.cpp
-+++ b/src/hotspot/share/compiler/compileBroker.cpp
-@@ -140,6 +140,8 @@ 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;
- 
- // Performance counters
- PerfCounter* CompileBroker::_perf_total_compilation = NULL;
-@@ -2320,8 +2322,19 @@ void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
-           locker.wait();
-         }
-       }
--      comp->compile_method(&ci_env, target, osr_bci, true, directive);
--
-+      if (AllowEnhancedClassRedefinition) {
-+        {
-+          MonitorLocker locker(DcevmCompilation_lock, Mutex::_no_safepoint_check_flag);
-+          while (_compilation_stopped) {
-+            locker.wait();
-+          }
-+          Atomic::add(&_active_compilations, 1);
-+        }
-+        comp->compile_method(&ci_env, target, osr_bci, true, directive);
-+        Atomic::sub(&_active_compilations, 1);
-+      } else {
-+        comp->compile_method(&ci_env, target, osr_bci, true, directive);
-+      }
-       /* Repeat compilation without installing code for profiling purposes */
-       int repeat_compilation_count = directive->RepeatCompilationOption;
-       while (repeat_compilation_count > 0) {
-@@ -2329,6 +2342,7 @@ void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
-         comp->compile_method(&ci_env, target, osr_bci, false , directive);
-         repeat_compilation_count--;
-       }
-+
-     }
- 
-     if (!ci_env.failing() && task->code() == NULL) {
-@@ -2942,3 +2956,23 @@ 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) {
-+    MonitorLocker locker(DcevmCompilation_lock, Mutex::_no_safepoint_check_flag);
-+    _compilation_stopped = true;
-+    while (_active_compilations > 0) {
-+      VM_ThreadsSuspendJVMTI tsj; // force safepoint to run C1/C2 VM op
-+      VMThread::execute(&tsj);
-+      locker.wait(10);
-+    }
-+  }
-+}
-+
-+void CompileBroker::releaseCompilationAfterEnhancedRedefinition() {
-+  if (AllowEnhancedClassRedefinition) {
-+    MonitorLocker locker(DcevmCompilation_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 0b721f83121..f146ff5c93d 100644
---- a/src/hotspot/share/compiler/compileBroker.hpp
-+++ b/src/hotspot/share/compiler/compileBroker.hpp
-@@ -175,6 +175,9 @@ 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 CompileQueue* _c2_compile_queue;
-   static CompileQueue* _c1_compile_queue;
- 
-@@ -423,6 +426,9 @@ 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_COMPILER_COMPILEBROKER_HPP
-diff --git a/src/hotspot/share/prims/jvmtiEnv.cpp b/src/hotspot/share/prims/jvmtiEnv.cpp
-index 8970d7991b7..9ca8e660197 100644
---- a/src/hotspot/share/prims/jvmtiEnv.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnv.cpp
-@@ -31,6 +31,7 @@
- #include "classfile/vmClasses.hpp"
- #include "classfile/vmSymbols.hpp"
- #include "gc/shared/collectedHeap.hpp"
-+#include "compiler/compileBroker.hpp"
- #include "interpreter/bytecodeStream.hpp"
- #include "interpreter/interpreter.hpp"
- #include "jfr/jfrEvents.hpp"
-@@ -458,8 +459,11 @@ JvmtiEnv::RetransformClasses(jint class_count, const jclass* classes) {
- 
-   if (AllowEnhancedClassRedefinition) {
-     MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
-+    // Stop compilation to avoid compilator race condition (crashes) with advanced redefinition
-+    CompileBroker::stopCompilationBeforeEnhancedRedefinition();
-     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_retransform);
-     VMThread::execute(&op);
-+    CompileBroker::releaseCompilationAfterEnhancedRedefinition();
-     op_id = op.id();
-     error = (op.check_error());
-   } else {
-@@ -489,8 +493,11 @@ JvmtiEnv::RedefineClasses(jint class_count, const jvmtiClassDefinition* class_de
- 
-   if (AllowEnhancedClassRedefinition) {
-     MutexLocker sd_mutex(EnhancedRedefineClasses_lock);
-+    // Stop compilation to avoid compilator race condition (crashes) with advanced redefinition
-+    CompileBroker::stopCompilationBeforeEnhancedRedefinition();
-     VM_EnhancedRedefineClasses op(class_count, class_definitions, jvmti_class_load_kind_redefine);
-     VMThread::execute(&op);
-+    CompileBroker::releaseCompilationAfterEnhancedRedefinition();
-     op_id = op.id();
-     error = (op.check_error());
-   } else {
-diff --git a/src/hotspot/share/runtime/mutexLocker.cpp b/src/hotspot/share/runtime/mutexLocker.cpp
-index 83982382e6f..beb36ebc177 100644
---- a/src/hotspot/share/runtime/mutexLocker.cpp
-+++ b/src/hotspot/share/runtime/mutexLocker.cpp
-@@ -84,6 +84,7 @@ 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;
-@@ -318,6 +319,8 @@ void mutex_init() {
-     def(Compilation_lock           , PaddedMonitor, leaf,        false, _safepoint_check_never);
-   }
- 
-+  def(DcevmCompilation_lock        , PaddedMonitor, nonleaf+1,   false, _safepoint_check_never);
-+
- #if INCLUDE_JFR
-   def(JfrMsg_lock                  , PaddedMonitor, leaf,        true,  _safepoint_check_always);
-   def(JfrBuffer_lock               , PaddedMutex  , leaf,        true,  _safepoint_check_never);
-diff --git a/src/hotspot/share/runtime/mutexLocker.hpp b/src/hotspot/share/runtime/mutexLocker.hpp
-index 65a6366bbfb..4333bd51464 100644
---- a/src/hotspot/share/runtime/mutexLocker.hpp
-+++ b/src/hotspot/share/runtime/mutexLocker.hpp
-@@ -80,6 +80,7 @@ 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
-

jb/project/tools/patches/dcevm/0044-G1-fixes-code-cleanup.patch

@@ -1,111 +0,0 @@
-From c45eb681e77d16b7e873c8e4dbd19f98879a102a Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Sat, 6 Nov 2021 19:47:08 +0100
-Subject: [PATCH 44/45] G1 fixes, code cleanup
-
----
- src/hotspot/share/compiler/compileBroker.cpp             | 2 ++
- src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp          | 4 +---
- src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp          | 4 ++++
- src/hotspot/share/gc/shared/gcConfig.cpp                 | 6 +++---
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 3 ++-
- 5 files changed, 12 insertions(+), 7 deletions(-)
-
-diff --git a/src/hotspot/share/compiler/compileBroker.cpp b/src/hotspot/share/compiler/compileBroker.cpp
-index 878bc265d2f..d8275508f9b 100644
---- a/src/hotspot/share/compiler/compileBroker.cpp
-+++ b/src/hotspot/share/compiler/compileBroker.cpp
-@@ -2958,6 +2958,8 @@ 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) {
-     MonitorLocker 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 765630a9826..c5bffc9bc49 100644
---- a/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCCompactTask.cpp
-@@ -140,7 +140,6 @@ void G1FullGCCompactTask::compact_region_dcevm(HeapRegion* hr, GrowableArray<Hea
-   hr->apply_to_marked_objects(collector()->mark_bitmap(), &compact);
-   // Once all objects have been moved the liveness information
-   // needs be cleared.
--  collector()->mark_bitmap()->clear_region(hr);
-   if (G1VerifyBitmaps) {
-     collector()->mark_bitmap()->clear_region(hr);
-   }
-@@ -150,8 +149,7 @@ 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/g1/g1FullGCPrepareTask.cpp b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
-index 93c066383a1..aa199f57dd7 100644
---- a/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
-+++ b/src/hotspot/share/gc/g1/g1FullGCPrepareTask.cpp
-@@ -146,6 +146,9 @@ bool G1FullGCPrepareTask::G1CalculatePointersClosure::should_compact(HeapRegion*
-   if (hr->is_pinned()) {
-     return false;
-   }
-+  if (Universe::is_redefining_gc_run()) {
-+    return true;
-+  }
-   size_t live_words = _collector->live_words(hr->hrm_index());
-   size_t live_words_threshold = _collector->scope()->region_compaction_threshold();
-   // High live ratio region will not be compacted.
-@@ -324,6 +327,7 @@ bool G1FullGCPrepareTask::G1PrepareCompactLiveClosureDcevm::must_rescue(oop old_
-   int new_size = old_obj->size_given_klass(oop(old_obj)->klass()->new_version());
-   int original_size = old_obj->size();
- 
-+  // what if old_obj > new_obj ?
-   bool overlap = (cast_from_oop<HeapWord*>(old_obj) + original_size < cast_from_oop<HeapWord*>(new_obj) + new_size);
- 
-   return overlap;
-diff --git a/src/hotspot/share/gc/shared/gcConfig.cpp b/src/hotspot/share/gc/shared/gcConfig.cpp
-index 8e78696bef5..f8365f94214 100644
---- a/src/hotspot/share/gc/shared/gcConfig.cpp
-+++ b/src/hotspot/share/gc/shared/gcConfig.cpp
-@@ -96,9 +96,9 @@ void GCConfig::fail_if_non_included_gc_is_selected() {
- }
- 
- void GCConfig::select_gc_ergonomically() {
--  if (AllowEnhancedClassRedefinition && !UseG1GC) {
--    // (DCEVM) Enhanced class redefinition only supports serial GC at the moment
--    FLAG_SET_ERGO(UseSerialGC, true);
-+  if (AllowEnhancedClassRedefinition && !UseSerialGC) {
-+    // (DCEVM) use G1 as default GC in Enhanced class redefinition
-+    FLAG_SET_ERGO(UseG1GC, true);
-   } else if (os::is_server_class_machine()) {
- #if INCLUDE_G1GC
-     FLAG_SET_ERGO_IF_DEFAULT(UseG1GC, true);
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 8615806ac98..32e0fcbe62b 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -385,7 +385,7 @@ class ChangePointersOopClosure : public BasicOopIterateClosure {
-     bool oop_updated  = false;
-     if (obj->is_instance() && InstanceKlass::cast(obj->klass())->is_mirror_instance_klass()) {
-       Klass* klass = java_lang_Class::as_Klass(obj);
--      if (klass != NULL && klass->is_instance_klass()) {
-+      if (klass != NULL && klass->is_instance_klass() && klass->new_version() != NULL) {
-         assert(obj == InstanceKlass::cast(klass)->java_mirror(), "just checking");
-         if (klass->new_version() != NULL) {
-           obj = InstanceKlass::cast(klass->new_version())->java_mirror();
-@@ -578,6 +578,7 @@ 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
-

jb/project/tools/patches/dcevm/0045-JBR-3867-fix-dcevm-redefinition-stops-due-the-not-up.patch

@@ -1,35 +0,0 @@
-From bb7c41e91326eaa90e25e02e13a2559adf41ae9e Mon Sep 17 00:00:00 2001
-From: Vladimir Dvorak <vladimir.dvorak@jetbrains.com>
-Date: Mon, 8 Nov 2021 19:51:41 +0100
-Subject: [PATCH 45/45] JBR-3867 - fix dcevm redefinition stops due the not
- updated weak oops
-
-Dcevm must update also oops in weak storage using WeakProcessor. Oops
-storage is new concept in java17.
----
- src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp | 2 ++
- 1 file changed, 2 insertions(+)
-
-diff --git a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-index 32e0fcbe62b..35dfc1a66d1 100644
---- a/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-+++ b/src/hotspot/share/prims/jvmtiEnhancedRedefineClasses.cpp
-@@ -67,6 +67,7 @@
- #include "gc/shared/dcevmSharedGC.hpp"
- #include "gc/shared/scavengableNMethods.hpp"
- #include "gc/shared/oopStorageSet.inline.hpp"
-+#include "gc/shared/weakProcessor.hpp"
- #include "ci/ciObjectFactory.hpp"
- 
- Array<Method*>* VM_EnhancedRedefineClasses::_old_methods = NULL;
-@@ -250,6 +251,7 @@ void VM_EnhancedRedefineClasses::root_oops_do(OopClosure *oopClosure) {
- 
-   Threads::oops_do(oopClosure, NULL);
-   OopStorageSet::strong_oops_do(oopClosure);
-+  WeakProcessor::oops_do(oopClosure);
- 
-   CodeBlobToOopClosure blobClosure(oopClosure, CodeBlobToOopClosure::FixRelocations);
-   CodeCache::blobs_do(&blobClosure);
--- 
-2.23.0
-

jb/project/tools/test/perfcmp.sh

@@ -49,7 +49,7 @@ echo $refFile
 echo $resFile
 
 curValues=`cat "$curFile" | cut -f 2 | tr -d '\t'`
-if [ -z noHeaders ]; then
+if [ -z $noHeaders ]; then
   curValuesHeader=`echo "$curValues" | head -n +1`_cur
   header=`cat "$refFile" | head -n +1 | awk -F'\t' -v x=$curValuesHeader '{print "  "$1"\t"$2"_ref\t"x"\tratio"}'`
   testContent=`paste -d '\t' $refFile <(echo "$curValues") | tail -n +2`
@@ -58,7 +58,7 @@ else
 fi
 
 testContent=`echo "$testContent" | awk -F'\t' '{ if ($3>$2+$2*0.1) {print "* "$1"\t"$2"\t"$3"\t"(($2==0)?"-":$3/$2)} else {print "  "$1"\t"$2"\t"$3"\t"(($2==0)?"-":$3/$2)} }'`
-if [ -z noHeaders ]; then
+if [ -z $noHeaders ]; then
   echo "$header" > $resFile
 fi
 echo "$testContent" >> $resFile

jb/project/tools/windows/scripts/mkimages_x64.sh

@@ -84,12 +84,6 @@ case "$bundle_type" in
   "jcef")
     do_reset_changes=0
     ;;
-  "dcevm")
-    HEAD_REVISION=$(git rev-parse HEAD)
-    git am jb/project/tools/patches/dcevm/*.patch || do_exit $?
-    do_reset_dcevm=0
-    do_reset_changes=0
-    ;;
   "nomod" | "")
     bundle_type=""
     ;;
@@ -120,7 +114,7 @@ JSDK=$IMAGES_DIR/jdk
 JSDK_MODS_DIR=$IMAGES_DIR/jmods
 JBRSDK_BUNDLE=jbrsdk
 
-if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ]; then
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "fd" ]; then
   git apply -p0 < jb/project/tools/patches/add_jcef_module.patch || do_exit $?
   update_jsdk_mods "$JSDK" "$JCEF_PATH"/jmods "$JSDK"/jmods "$JSDK_MODS_DIR" || do_exit $?
   cp $JCEF_PATH/jmods/* ${JSDK_MODS_DIR} # $JSDK/jmods is not unchanged
@@ -134,7 +128,7 @@ create_image_bundle "jbr${jbr_name_postfix}" "jbr" $JSDK_MODS_DIR "$modules" ||
 
 # create sdk image bundle
 modules=$(cat ${JSDK}/release | grep MODULES | sed s/MODULES=//g | sed s/' '/','/g | sed s/\"//g | sed s/\\r//g | sed s/\\n//g)
-if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "dcevm" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
+if [ "$bundle_type" == "jcef" ] || [ "$bundle_type" == "fd" ] || [ "$bundle_type" == "$JBRSDK_BUNDLE" ]; then
   modules=${modules},$(get_mods_list "$JCEF_PATH"/jmods)
 fi
 create_image_bundle "$JBRSDK_BUNDLE${jbr_name_postfix}" "$JBRSDK_BUNDLE" "$JSDK_MODS_DIR" "$modules" || do_exit $?

make/CreateJmods.gmk

@@ -221,6 +221,26 @@ else
   JMOD_FLAGS += --exclude '**{_the.*,_*.marker*,*.diz,*.debuginfo,*.dSYM/**,*.dSYM}'
 endif
 
+# For reproducible builds specify the jmod --date using SOURCE_DATE in ISO-8601
+ifeq ($(ENABLE_REPRODUCIBLE_BUILD), true)
+  JMOD_SOURCE_DATE := --date $(SOURCE_DATE_ISO_8601)
+else
+  JMOD_SOURCE_DATE :=
+endif
+
+ifeq ($(ENABLE_REPRODUCIBLE_BUILD), true)
+  ifeq ($(MODULE), java.base)
+    JAR_FILE_TO_FIX := $(SUPPORT_OUTPUTDIR)/modules_libs/java.base/jrt-fs.jar
+    $(eval $(call SetupExecute, fixup_jrtfs_jar, \
+      WARN := Fixing timestamps in modules_libs/java.base/jrt-fs.jar, \
+      DEPS := $(JAR_FILE_TO_FIX) $(JDK_OUTPUTDIR)/bin/jar, \
+      OUTPUT_DIR := $(JMODS_SUPPORT_DIR), \
+      COMMAND := $(FIXPATH) $(JDK_OUTPUTDIR)/bin/jar --date $(SOURCE_DATE_ISO_8601) --update --file $(JAR_FILE_TO_FIX) @$(SUPPORT_OUTPUTDIR)/modules_libs/java.base/_the.jrt-fs.jar_contents, \
+    ))
+    DEPS += $(fixup_jrtfs_jar_TARGET)
+  endif
+endif
+
 # Create jmods in the support dir and then move them into place to keep the
 # module path in $(IMAGES_OUTPUTDIR)/jmods valid at all times.
 $(eval $(call SetupExecute, create_$(JMOD_FILE), \
@@ -232,6 +252,7 @@ $(eval $(call SetupExecute, create_$(JMOD_FILE), \
     COMMAND := $(JMOD) create --module-version $(VERSION_SHORT) \
         --target-platform '$(OPENJDK_MODULE_TARGET_PLATFORM)' \
         --module-path $(JMODS_DIR) $(JMOD_FLAGS) \
+        $(JMOD_SOURCE_DATE) \
         $(JMODS_SUPPORT_DIR)/$(JMOD_FILE), \
     POST_COMMAND := $(MV) $(JMODS_SUPPORT_DIR)/$(JMOD_FILE) $(JMODS_DIR)/$(JMOD_FILE), \
 ))

make/InitSupport.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -313,6 +313,15 @@ else # $(HAS_SPEC)=true
       SOURCE_DATE := $$(shell $$(DATE) +"%s")
     endif
     export SOURCE_DATE_EPOCH := $$(SOURCE_DATE)
+    ifeq ($$(IS_GNU_DATE), yes)
+      export SOURCE_DATE_ISO_8601 := $$(shell $$(DATE) --utc \
+                                                       --date="@$$(SOURCE_DATE_EPOCH)" \
+                                                       +"%Y-%m-%dT%H:%M:%SZ" 2> /dev/null)
+    else
+      export SOURCE_DATE_ISO_8601 := $$(shell $$(DATE) -u \
+                                                       -j -f "%s" "$$(SOURCE_DATE_EPOCH)" \
+                                                       +"%Y-%m-%dT%H:%M:%SZ" 2> /dev/null)
+    endif
   endef
 
   # Parse COMPARE_BUILD into COMPARE_BUILD_*

make/JBRApi.gmk

@@ -18,18 +18,19 @@ include $(SPEC)
 include MakeBase.gmk
 include JavaCompilation.gmk
 
-JBR_API_ROOT_DIR := $(TOPDIR)/src/jetbrains.api
-JBR_API_GENSRC_TEMPLATES := $(JBR_API_ROOT_DIR)/templates
-JBR_API_SRC_DIR          := $(JBR_API_ROOT_DIR)/src
+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_GENSRC_SOURCES := $(call FindFiles, $(JBR_API_GENSRC_TEMPLATES))
-JBR_API_GENSRC_FILES := $(foreach f, $(call FindFiles, $(JBR_API_GENSRC_TEMPLATES)/com), \
-    $(JBR_API_GENSRC_DIR)/$(call RelativePath, $f, $(JBR_API_GENSRC_TEMPLATES)))
 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>
@@ -43,27 +44,30 @@ ARCHIVE_BUILD_JBR_API_BIN := $(JBR_API_BIN_DIR)
 $(eval $(call SetupJavaCompilation, BUILD_JBR_API, \
     SMALL_JAVA := true, \
     COMPILER := bootjdk, \
-    SRC := $(JBR_API_GENSRC_DIR) $(JBR_API_SRC_DIR), \
+    SRC := $(JBR_API_GENSRC_DIR), \
     EXTRA_FILES := $(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) $(JBR_API_SRC_FILES), \
-    SRCS := $(JBR_API_GENSRC_DIR) $(JBR_API_SRC_DIR), \
+    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), \
 ))
 
-$(JBR_API_GENSRC_FILES): $(JBR_API_GENSRC_SOURCES) $(JBR_API_SRC_FILES) $(JBR_API_VERSION_PROPERTIES)
+# Grouped targets may not be supported, so hack dependencies: sources -> version file -> generated sources
+$(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_GENSRC_TEMPLATES)/Gensrc.java" \
+	$(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_SRC_FILES) $(JBR_API_VERSION_PROPERTIES)
-	$(JAVA_CMD) $(JAVA_FLAGS_SMALL) "$(JBR_API_GENSRC_TEMPLATES)/CheckVersion.java" \
+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
@@ -72,7 +76,7 @@ jbr-api: $(BUILD_JBR_API) $(BUILD_JBR_API_SOURCES_JAR) jbr-api-check-version
 
 ifneq ($(JBR_API_CONF_FILE),)
   $(JBR_API_CONF_FILE): $(JBR_API_GENSRC_FILES)
-	$(ECHO) "VERSION=`$(CAT) $(JBR_API_OUTPUT_DIR)/jbr-api.version`" > $(JBR_API_CONF_FILE)
+	$(ECHO) "VERSION=`$(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)

make/Main.gmk

@@ -324,7 +324,7 @@ $(eval $(call SetupTarget, vscode-project-ccls, \
 # aren't built until after libjava and libjvm are available to link to.
 $(eval $(call SetupTarget, demos-jdk, \
     MAKEFILE := CompileDemos, \
-    DEPS := java.base-libs exploded-image, \
+    DEPS := java.base-libs exploded-image buildtools-jdk, \
 ))
 
 $(eval $(call SetupTarget, test-image-demos-jdk, \
@@ -383,12 +383,12 @@ bootcycle-images:
 
 $(eval $(call SetupTarget, zip-security, \
     MAKEFILE := ZipSecurity, \
-    DEPS := java.base-java java.security.jgss-java java.security.jgss-libs, \
+    DEPS := buildtools-jdk java.base-java java.security.jgss-java java.security.jgss-libs, \
 ))
 
 $(eval $(call SetupTarget, zip-source, \
     MAKEFILE := ZipSource, \
-    DEPS := gensrc, \
+    DEPS := buildtools-jdk gensrc, \
 ))
 
 $(eval $(call SetupTarget, jrtfs-jar, \
@@ -508,13 +508,13 @@ $(eval $(call SetupTarget, docs-jdk-index, \
 $(eval $(call SetupTarget, docs-zip, \
     MAKEFILE := Docs, \
     TARGET := docs-zip, \
-    DEPS :=  docs-jdk, \
+    DEPS :=  docs-jdk buildtools-jdk, \
 ))
 
 $(eval $(call SetupTarget, docs-specs-zip, \
     MAKEFILE := Docs, \
     TARGET := docs-specs-zip, \
-    DEPS := docs-jdk-specs, \
+    DEPS := docs-jdk-specs buildtools-jdk, \
 ))
 
 $(eval $(call SetupTarget, update-build-docs, \

make/ToolsJdk.gmk

@@ -80,6 +80,8 @@ TOOL_GENERATECACERTS = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_class
 TOOL_GENERATEEMOJIDATA = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
     build.tools.generateemojidata.GenerateEmojiData
 
+TOOL_MAKEZIPREPRODUCIBLE = $(JAVA_SMALL) -cp $(BUILDTOOLS_OUTPUTDIR)/jdk_tools_classes \
+    build.tools.makezipreproducible.MakeZipReproducible
 
 # TODO: There are references to the jdwpgen.jar in jdk/make/netbeans/jdwpgen/build.xml
 # and nbproject/project.properties in the same dir. Needs to be looked at.

make/autoconf/basic_tools.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2020, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2022, 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
@@ -356,13 +356,17 @@ AC_DEFUN_ONCE([BASIC_SETUP_COMPLEX_TOOLS],
   fi
   AC_SUBST(IS_GNU_TIME)
 
-  # Check if it's GNU date
-  check_date=`$DATE --version 2>&1 | $GREP GNU`
+  # Check if it's a GNU date compatible version
+  AC_MSG_CHECKING([if date is a GNU compatible version])
+  check_date=`$DATE --version 2>&1 | $GREP "GNU\|BusyBox"`
   if test "x$check_date" != x; then
+    AC_MSG_RESULT([yes])
     IS_GNU_DATE=yes
   else
+    AC_MSG_RESULT([no])
     IS_GNU_DATE=no
   fi
+  AC_SUBST(IS_GNU_DATE)
 
   if test "x$OPENJDK_TARGET_OS" = "xmacosx"; then
     UTIL_REQUIRE_PROGS(DSYMUTIL, dsymutil)

make/autoconf/boot-jdk.m4

@@ -357,6 +357,16 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK],
 
   # Finally, set some other options...
 
+  # Determine if the boot jdk jar supports the --date option
+  if $JAR --help 2>&1 | $GREP -q "\-\-date=TIMESTAMP"; then
+    BOOT_JDK_JAR_SUPPORTS_DATE=true
+  else
+    BOOT_JDK_JAR_SUPPORTS_DATE=false
+  fi
+  AC_MSG_CHECKING([if Boot JDK jar supports --date=TIMESTAMP])
+  AC_MSG_RESULT([$BOOT_JDK_JAR_SUPPORTS_DATE])
+  AC_SUBST(BOOT_JDK_JAR_SUPPORTS_DATE)
+
   # When compiling code to be executed by the Boot JDK, force compatibility with the
   # oldest supported bootjdk.
   OLDEST_BOOT_JDK=`$ECHO $DEFAULT_ACCEPTABLE_BOOT_VERSIONS \

make/autoconf/flags-cflags.m4

@@ -778,6 +778,8 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
               FILE_MACRO_CFLAGS=
           ]
       )
+      # -fdebug-prefix-map is supported by all modern versions of gcc/clang
+      DEBUG_PREFIX_CFLAGS=" -fdebug-prefix-map=${workspace_root_trailing_slash}="
     elif test "x$TOOLCHAIN_TYPE" = xmicrosoft &&
         test "x$ENABLE_REPRODUCIBLE_BUILD" = xtrue; then
       # There is a known issue with the pathmap if the mapping is made to the
@@ -810,12 +812,12 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
       $TOOLCHAIN_CFLAGS_JVM ${$1_TOOLCHAIN_CFLAGS_JVM} \
       $OS_CFLAGS $OS_CFLAGS_JVM $CFLAGS_OS_DEF_JVM $DEBUG_CFLAGS_JVM \
       $WARNING_CFLAGS $WARNING_CFLAGS_JVM $JVM_PICFLAG $FILE_MACRO_CFLAGS \
-      $REPRODUCIBLE_CFLAGS"
+      $REPRODUCIBLE_CFLAGS $DEBUG_PREFIX_CFLAGS"
 
   CFLAGS_JDK_COMMON="$ALWAYS_CFLAGS_JDK $ALWAYS_DEFINES_JDK $TOOLCHAIN_CFLAGS_JDK \
       $OS_CFLAGS $CFLAGS_OS_DEF_JDK $DEBUG_CFLAGS_JDK $DEBUG_OPTIONS_FLAGS_JDK \
       $WARNING_CFLAGS $WARNING_CFLAGS_JDK $DEBUG_SYMBOLS_CFLAGS_JDK \
-      $FILE_MACRO_CFLAGS $REPRODUCIBLE_CFLAGS"
+      $FILE_MACRO_CFLAGS $REPRODUCIBLE_CFLAGS $DEBUG_PREFIX_CFLAGS"
 
   # Use ${$2EXTRA_CFLAGS} to block EXTRA_CFLAGS to be added to build flags.
   # (Currently we don't have any OPENJDK_BUILD_EXTRA_CFLAGS, but that might

make/autoconf/flags-other.m4

@@ -82,6 +82,14 @@ AC_DEFUN([FLAGS_SETUP_ASFLAGS],
   elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
     BASIC_ASFLAGS="-nologo -c"
   fi
+
+  if test "x$ALLOW_ABSOLUTE_PATHS_IN_OUTPUT" = "xfalse"; then
+    if test "x$TOOLCHAIN_TYPE" = xgcc || test "x$TOOLCHAIN_TYPE" = xclang; then
+      workspace_root_trailing_slash="${WORKSPACE_ROOT%/}/"
+      BASIC_ASFLAGS+=" -fdebug-prefix-map=${workspace_root_trailing_slash}="
+    fi
+  fi
+
   AC_SUBST(BASIC_ASFLAGS)
 
   if test "x$OPENJDK_TARGET_OS" = xmacosx; then

make/autoconf/spec.gmk.in

@@ -364,6 +364,9 @@ BUILD_JDK:=@BUILD_JDK@
 CREATE_BUILDJDK:=@CREATE_BUILDJDK@
 EXTERNAL_BUILDJDK:=@EXTERNAL_BUILDJDK@
 
+# Whether the boot jdk jar supports --date=TIMESTAMP
+BOOT_JDK_JAR_SUPPORTS_DATE:=@BOOT_JDK_JAR_SUPPORTS_DATE@
+
 # When compiling Java source to be run by the boot jdk
 # use these extra flags, eg -source 6 -target 6
 BOOT_JDK_SOURCETARGET:=@BOOT_JDK_SOURCETARGET@
@@ -707,6 +710,7 @@ CODESIGN:=@CODESIGN@
 CP:=@CP@
 CUT:=@CUT@
 DATE:=@DATE@
+IS_GNU_DATE:=@IS_GNU_DATE@
 DIFF:=@DIFF@
 DIRNAME:=@DIRNAME@
 DSYMUTIL:=@DSYMUTIL@

make/autoconf/util.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
@@ -236,13 +236,15 @@ AC_DEFUN([UTIL_GET_MATCHING_VALUES],
 # $2: input date/time string
 AC_DEFUN([UTIL_GET_EPOCH_TIMESTAMP],
 [
-  timestamp=$($DATE --utc --date=$2 +"%s" 2> /dev/null)
-  if test "x$timestamp" = x; then
-    # GNU date format did not work, try BSD date options
-    timestamp=$($DATE -j -f "%F %T" "$2" "+%s" 2> /dev/null)
+  if test "x$IS_GNU_DATE" = xyes; then
+    # GNU date
+    timestamp=$($DATE --utc --date=$2 +"%s" 2> /dev/null)
+  else
+    # BSD date
+    timestamp=$($DATE -u -j -f "%F %T" "$2" "+%s" 2> /dev/null)
     if test "x$timestamp" = x; then
       # Perhaps the time was missing
-      timestamp=$($DATE -j -f "%F %T" "$2 00:00:00" "+%s" 2> /dev/null)
+      timestamp=$($DATE -u -j -f "%F %T" "$2 00:00:00" "+%s" 2> /dev/null)
       # If this did not work, we give up and return the empty string
     fi
   fi

make/autoconf/version-numbers

@@ -0,0 +1,55 @@
+#
+# 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
+# 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.
+#
+
+# Default version, product, and vendor information to use,
+# unless overridden by configure
+
+DEFAULT_VERSION_FEATURE=15
+DEFAULT_VERSION_INTERIM=0
+DEFAULT_VERSION_UPDATE=0
+DEFAULT_VERSION_PATCH=0
+DEFAULT_VERSION_EXTRA1=0
+DEFAULT_VERSION_EXTRA2=0
+DEFAULT_VERSION_EXTRA3=0
+DEFAULT_VERSION_DATE=2020-09-15
+DEFAULT_VERSION_CLASSFILE_MAJOR=59  # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
+DEFAULT_VERSION_CLASSFILE_MINOR=0
+DEFAULT_ACCEPTABLE_BOOT_VERSIONS="14 15"
+DEFAULT_JDK_SOURCE_TARGET_VERSION=15
+DEFAULT_PROMOTED_VERSION_PRE=
+
+LAUNCHER_NAME=openjdk
+PRODUCT_NAME=OpenJDK
+PRODUCT_SUFFIX="Runtime Environment"
+JDK_RC_PLATFORM_NAME=Platform
+COMPANY_NAME=N/A
+HOTSPOT_VM_DISTRO="Dynamic Code Evolution"
+VENDOR_URL=https://openjdk.java.net/
+VENDOR_URL_BUG=https://bugreport.java.com/bugreport/
+VENDOR_URL_VM_BUG=https://bugreport.java.com/bugreport/crash.jsp
+
+# Might need better names for these
+MACOSX_BUNDLE_NAME_BASE="OpenJDK"
+MACOSX_BUNDLE_ID_BASE="net.java.openjdk"

make/common/JarArchive.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -193,7 +193,7 @@ define SetupJarArchiveBody
   $1_UPDATE_CONTENTS=\
       if [ "`$(WC) -l $$($1_BIN)/_the.$$($1_JARNAME)_contents | $(AWK) '{ print $$$$1 }'`" -gt "0" ]; then \
         $(ECHO) "  updating" `$(WC) -l $$($1_BIN)/_the.$$($1_JARNAME)_contents | $(AWK) '{ print $$$$1 }'` files && \
-        $$($1_JAR_CMD) $$($1_JAR_UPDATE_OPTIONS) $$@ @$$($1_BIN)/_the.$$($1_JARNAME)_contents; \
+        $$($1_JAR_CMD) --update $$($1_JAR_OPTIONS) --file $$@ @$$($1_BIN)/_the.$$($1_JARNAME)_contents; \
       fi $$(NEWLINE)
   # The s-variants of the above macros are used when the jar is created from scratch.
   # NOTICE: please leave the parentheses space separated otherwise the AIX build will break!
@@ -212,25 +212,27 @@ define SetupJarArchiveBody
             | $(SED) 's|$$(src)/|-C $$(src) |g' >> \
         $$($1_BIN)/_the.$$($1_JARNAME)_contents) $$(NEWLINE) )
   endif
-  $1_SUPDATE_CONTENTS=$$($1_JAR_CMD) $$($1_JAR_UPDATE_OPTIONS) $$@ @$$($1_BIN)/_the.$$($1_JARNAME)_contents $$(NEWLINE)
+  $1_SUPDATE_CONTENTS=$$($1_JAR_CMD) --update $$($1_JAR_OPTIONS) --file $$@ @$$($1_BIN)/_the.$$($1_JARNAME)_contents $$(NEWLINE)
 
   # Use a slightly shorter name for logging, but with enough path to identify this jar.
   $1_NAME:=$$(subst $$(OUTPUTDIR)/,,$$($1_JAR))
 
-  ifneq (,$$($1_CHECK_COMPRESS_JAR))
-    $1_JAR_CREATE_OPTIONS := c0fm
-    $1_JAR_UPDATE_OPTIONS := u0f
-    ifeq ($(COMPRESS_JARS), true)
-      $1_JAR_CREATE_OPTIONS := cfm
-      $1_JAR_UPDATE_OPTIONS := uf
+  # If reproducible build and the boot jdk jar supports --date option
+  # then specify the --date using SOURCE_DATE in ISO-8601
+  $1_JAR_OPTIONS :=
+  ifeq ($$(ENABLE_REPRODUCIBLE_BUILD), true)
+    ifeq ($$(BOOT_JDK_JAR_SUPPORTS_DATE), true)
+      $1_JAR_OPTIONS += --date $(SOURCE_DATE_ISO_8601)
+    endif
+  endif
+  ifneq (,$$($1_CHECK_COMPRESS_JAR))
+    ifneq ($(COMPRESS_JARS), true)
+      $1_JAR_OPTIONS += --no-compress
     endif
-  else
-    $1_JAR_CREATE_OPTIONS := cfm
-    $1_JAR_UPDATE_OPTIONS := uf
   endif
 
   # Include all variables of significance in the vardeps file
-  $1_VARDEPS := $$($1_JAR_CMD) $$($1_JAR_CREATE_OPTIONS) $$($1_MANIFEST) \
+  $1_VARDEPS := $$($1_JAR_CMD) $$($1_JAR_OPTIONS) $$($1_MANIFEST) \
       $$($1_JARMAIN) $$($1_EXTRA_MANIFEST_ATTR) $$($1_ORIG_DEPS) $$($1_SRCS) \
       $$($1_INCLUDES) $$($1_EXCLUDES) $$($1_EXCLUDE_FILES) $$($1_EXTRA_FILES)
   $1_VARDEPS_FILE := $$(call DependOnVariable, $1_VARDEPS, $$($1_BIN)/_the.$$($1_JARNAME).vardeps)
@@ -255,7 +257,7 @@ define SetupJarArchiveBody
 	  $$(if $$($1_EXTRA_MANIFEST_ATTR), \
 	    $(PRINTF) "$$($1_EXTRA_MANIFEST_ATTR)\n" >> $$($1_MANIFEST_FILE) $$(NEWLINE)) \
 	  $(ECHO) Creating $$($1_NAME) $$(NEWLINE) \
-	  $$($1_JAR_CMD) $$($1_JAR_CREATE_OPTIONS) $$@ $$($1_MANIFEST_FILE) $$(NEWLINE) \
+	  $$($1_JAR_CMD) --create $$($1_JAR_OPTIONS) --file $$@ --manifest $$($1_MANIFEST_FILE) $$(NEWLINE) \
 	  $$($1_SCAPTURE_CONTENTS) \
 	  $$($1_SCAPTURE_METAINF) \
 	  $$($1_SUPDATE_CONTENTS) \

make/common/ZipArchive.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -26,6 +26,9 @@
 ifndef _ZIP_ARCHIVE_GMK
 _ZIP_ARCHIVE_GMK := 1
 
+# Depends on build tools for MakeZipReproducible
+include ../ToolsJdk.gmk
+
 ifeq (,$(_MAKEBASE_GMK))
   $(error You must include MakeBase.gmk prior to including ZipArchive.gmk)
 endif
@@ -51,6 +54,8 @@ endif
 #   FOLLOW_SYMLINKS - Set to explicitly follow symlinks. Affects performance of
 #                     finding files.
 #   ZIP_OPTIONS extra options to pass to zip
+#   REPRODUCIBLE override ENABLE_REPRODUCIBLE_BUILD (to make zip reproducible or not)
+
 SetupZipArchive = $(NamedParamsMacroTemplate)
 define SetupZipArchiveBody
 
@@ -124,6 +129,10 @@ define SetupZipArchiveBody
     ) \
   )
 
+  ifeq ($$($1_REPRODUCIBLE), )
+    $1_REPRODUCIBLE := $$(ENABLE_REPRODUCIBLE_BUILD)
+  endif
+
   # Use a slightly shorter name for logging, but with enough path to identify this zip.
   $1_NAME:=$$(subst $$(OUTPUTDIR)/,,$$($1_ZIP))
 
@@ -134,6 +143,8 @@ define SetupZipArchiveBody
   # dir is very small.
   # If zip has nothing to do, it returns 12 and would fail the build. Check for 12
   # and only fail if it's not.
+  # For reproducible builds set the zip access & modify times to SOURCE_DATE_EPOCH
+  # by using a ziptmp folder to generate final zip from using MakeZipReproducible.
   $$($1_ZIP) : $$($1_ALL_SRCS) $$($1_EXTRA_DEPS)
 	$$(call LogWarn, Updating $$($1_NAME))
 	$$(call MakeTargetDir)
@@ -163,7 +174,18 @@ define SetupZipArchiveBody
 	        $$($1_ZIP_EXCLUDES_$$s) \
 	        || test "$$$$?" = "12" \
 	    ))$$(NEWLINE) \
-	) true \
+	) true
+        ifeq ($$($1_REPRODUCIBLE), true)
+	    $$(call ExecuteWithLog, \
+		$$(SUPPORT_OUTPUTDIR)/makezipreproducible/$$(patsubst $$(OUTPUTDIR)/%,%, $$@), \
+		($(RM) $$(SUPPORT_OUTPUTDIR)/ziptmp/$1/tmp.zip && \
+		 $(MKDIR) -p $$(SUPPORT_OUTPUTDIR)/ziptmp/$1 && \
+		 $(TOOL_MAKEZIPREPRODUCIBLE) -f $$(SUPPORT_OUTPUTDIR)/ziptmp/$1/tmp.zip \
+			 		     -t $(SOURCE_DATE_EPOCH) $$@ && \
+		 $(RM) $$@ && \
+		 $(MV) $$(SUPPORT_OUTPUTDIR)/ziptmp/$1/tmp.zip $$@ \
+		))
+        endif
 	$(TOUCH) $$@
 
   # Add zip to target list

make/jdk/src/classes/build/tools/makezipreproducible/MakeZipReproducible.java

@@ -0,0 +1,237 @@
+/*
+ * Copyright (c) 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.
+ *
+ * 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.
+ */
+
+package build.tools.makezipreproducible;
+
+import java.io.*;
+import java.nio.file.*;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.nio.channels.Channels;
+import java.nio.channels.FileChannel;
+import java.util.*;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipException;
+import java.util.zip.ZipFile;
+import java.util.zip.ZipInputStream;
+import java.util.zip.ZipOutputStream;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.LocalDateTime;
+
+/**
+ * Generate a zip file in a "reproducible" manner from the input zip file.
+ * Standard zip tools rely on OS file list querying whose ordering can vary
+ * by platform architecture, this class ensures the zip entries are ordered
+ * and also supports SOURCE_DATE_EPOCH timestamps which will set the ZipEntry
+ * local time in UTC.
+ */
+public class MakeZipReproducible {
+    String input_file = null;
+    String fname = null;
+    String zname = "";
+    LocalDateTime timestamp = null;
+    boolean verbose = false;
+
+    // Keep a sorted Set of ZipEntrys to be processed, so that the zip is reproducible
+    SortedMap<String, ZipEntry> entries  = new TreeMap<String, ZipEntry>();
+
+    private boolean ok;
+
+    public MakeZipReproducible() {
+    }
+
+    public synchronized boolean run(String args[]) {
+        ok = true;
+        if (!parseArgs(args)) {
+            return false;
+        }
+        try {
+            zname = fname.replace(File.separatorChar, '/');
+            if (zname.startsWith("./")) {
+                zname = zname.substring(2);
+            }
+
+            if (verbose) System.out.println("Input zip file: " + input_file);
+
+            File inFile  = new File(input_file);
+            if (!inFile.exists()) {
+                error("Input zip file does not exist");
+                ok = false;
+            } else {
+                File zipFile = new File(fname);
+                // Check archive to create does not exist
+                if (!zipFile.exists()) {
+                    // Process input ZipEntries
+                    ok = processInputEntries(inFile);
+                    if (ok) {
+                        try (FileOutputStream out = new FileOutputStream(fname)) {
+                            ok = create(inFile, new BufferedOutputStream(out, 4096));
+                        }
+                    } else {
+                    }
+                } else {
+                    error("Target zip file "+fname+" already exists.");
+                    ok = false;
+                }
+            }
+        } catch (IOException e) {
+            fatalError(e);
+            ok = false;
+        } catch (Error ee) {
+            ee.printStackTrace();
+            ok = false;
+        } catch (Throwable t) {
+            t.printStackTrace();
+            ok = false;
+        }
+        return ok;
+    }
+
+    boolean parseArgs(String args[]) {
+        try {
+            boolean parsingIncludes = false;
+            boolean parsingExcludes = false;
+            int count = 0;
+            while(count < args.length) {
+                if (args[count].startsWith("-")) {
+                    String flag = args[count].substring(1);
+                    switch (flag.charAt(0)) {
+                    case 'f':
+                        fname = args[++count];
+                        break;
+                    case 't':
+                        // SOURCE_DATE_EPOCH timestamp specified
+                        long epochSeconds = Long.parseLong(args[++count]);
+                        Instant instant = Instant.ofEpochSecond(epochSeconds);
+                        timestamp = LocalDateTime.ofInstant(instant, ZoneOffset.UTC);
+                        break;
+                    case 'v':
+                        verbose = true;
+                        break;
+                    default:
+                        error(String.format("Illegal option -%s", String.valueOf(flag.charAt(0))));
+                        usageError();
+                        return false;
+                    }
+                } else {
+                    // input zip file
+                    if (input_file != null) {
+                        error("Input zip file already specified");
+                        usageError();
+                        return false;
+                    }
+                    input_file = args[count];
+                }
+                count++;
+            }
+        } catch (ArrayIndexOutOfBoundsException e) {
+            usageError();
+            return false;
+        } catch (NumberFormatException e) {
+            usageError();
+            return false;
+        }
+        if (fname == null) {
+            error("-f <outputArchiveName> must be specified");
+            usageError();
+            return false;
+        }
+        // If no files specified then default to current directory
+        if (input_file == null) {
+            error("No input zip file specified");
+            usageError();
+            return false;
+        }
+
+        return true;
+    }
+
+    // Process input zip file and add to sorted entries set
+    boolean processInputEntries(File inFile) throws IOException {
+        ZipFile zipFile = new ZipFile(inFile);
+        zipFile.stream().forEach(entry -> entries.put(entry.getName(), entry));
+
+        return true;
+    }
+
+    // Create new zip from entries
+    boolean create(File inFile, OutputStream out) throws IOException
+    {
+        try (ZipFile zipFile = new ZipFile(inFile);
+             ZipOutputStream zos = new ZipOutputStream(out)) {
+            for (Map.Entry<String, ZipEntry> entry : entries.entrySet()) {
+                ZipEntry zipEntry = entry.getValue();
+                if (zipEntry.getSize() > 0) {
+                    try (InputStream eis = zipFile.getInputStream(zipEntry)) {
+                        addEntry(zos, zipEntry, eis);
+                    }
+                } else {
+                    addEntry(zos, zipEntry, null);
+                }
+            }
+        }
+        return true;
+    }
+
+    // Add Entry and data to Zip
+    void addEntry(ZipOutputStream zos, ZipEntry entry, InputStream entryInputStream) throws IOException {
+        if (verbose) {
+            System.out.println("Adding: "+entry.getName());
+        }
+
+        // Set to specified timestamp if set otherwise leave as original lastModified time
+        if (timestamp != null) {
+            entry.setTimeLocal(timestamp);
+        }
+
+        zos.putNextEntry(entry);
+        if (entry.getSize() > 0 && entryInputStream != null) {
+            entryInputStream.transferTo(zos);
+        }
+        zos.closeEntry();
+    }
+
+    void usageError() {
+        error(
+        "Usage: MakeZipReproducible [-v] [-t <SOURCE_DATE_EPOCH>] -f <output_zip_file> <input_zip_file>\n" +
+        "Options:\n" +
+        "   -v  verbose output\n" +
+        "   -f  specify archive file name to create\n" +
+        "   -t  specific SOURCE_DATE_EPOCH value to use for timestamps\n" +
+        "   input_zip_file re-written as a reproducible zip output_zip_file.\n");
+    }
+
+    void fatalError(Exception e) {
+        e.printStackTrace();
+    }
+
+    protected void error(String s) {
+        System.err.println(s);
+    }
+
+    public static void main(String args[]) {
+        MakeZipReproducible z = new MakeZipReproducible();
+        System.exit(z.run(args) ? 0 : 1);
+    }
+}
+

modules.list

@@ -31,6 +31,7 @@ jdk.httpserver,
 jdk.internal.ed,
 jdk.internal.le,
 jdk.internal.vm.ci,
+jdk.javadoc,
 jdk.jdi,
 jdk.jdwp.agent,
 jdk.jfr,
@@ -46,6 +47,7 @@ jdk.sctp,
 jdk.security.auth,
 jdk.security.jgss,
 jdk.unsupported,
+jdk.unsupported.desktop,
 jdk.xml.dom,
 jdk.zipfs,
 jdk.hotspot.agent,

src/hotspot/os_cpu/bsd_aarch64/copy_bsd_aarch64.S

@@ -25,6 +25,7 @@
 
 #define CFUNC(x) _##x
 
+        .file "copy_bsd_aarch64.S"
         .global CFUNC(_Copy_conjoint_words)
         .global CFUNC(_Copy_disjoint_words)
 

src/hotspot/os_cpu/bsd_x86/bsd_x86_32.S

@@ -31,6 +31,7 @@
 #define ELF_TYPE(name, description) .type name,description
 #endif
 
+        .file "bsd_x86_32.S"
         .globl SYMBOL(fixcw)
 
         # NOTE WELL!  The _Copy functions are called directly

src/hotspot/os_cpu/bsd_x86/bsd_x86_64.S

@@ -30,6 +30,7 @@
 #define ELF_TYPE(name, description) .type name,description
 #endif
 
+        .file "bsd_x86_64.S"
         # NOTE WELL!  The _Copy functions are called directly
 	# from server-compiler-generated code via CallLeafNoFP,
 	# which means that they *must* either not use floating

src/hotspot/os_cpu/linux_aarch64/atomic_linux_aarch64.S

@@ -19,7 +19,7 @@
 // or visit www.oracle.com if you need additional information or have any
 // questions.
 
-
+        .file "atomic_linux_aarch64.S"
 
         .text
 

src/hotspot/os_cpu/linux_aarch64/copy_linux_aarch64.S

@@ -21,6 +21,8 @@
  * questions.
  *
  */
+        .file "copy_linux_aarch64.S"
+
         .global _Copy_conjoint_words
         .global _Copy_disjoint_words
 

src/hotspot/os_cpu/linux_aarch64/threadLS_linux_aarch64.S

@@ -19,6 +19,8 @@
 // or visit www.oracle.com if you need additional information or have any
 // questions.
 
+        .file "threadLS_linux_aarch64.S"
+
         // JavaThread::aarch64_get_thread_helper()
         //
         // Return the current thread pointer in x0.

src/hotspot/os_cpu/linux_arm/linux_arm_32.S

@@ -21,6 +21,7 @@
 # questions.
 #
 
+        .file "linux_arm_32.S"
 
         # NOTE WELL!  The _Copy functions are called directly
 	# from server-compiler-generated code via CallLeafNoFP,

src/hotspot/os_cpu/linux_x86/linux_x86_32.S

@@ -22,6 +22,8 @@
 #
 
 
+        .file "linux_x86_32.S"
+
         # NOTE WELL!  The _Copy functions are called directly
 	# from server-compiler-generated code via CallLeafNoFP,
 	# which means that they *must* either not use floating

src/hotspot/os_cpu/linux_x86/linux_x86_64.S

@@ -21,6 +21,7 @@
 # questions.
 #
 
+        .file "linux_x86_64.S"
 
         # NOTE WELL!  The _Copy functions are called directly
 	# from server-compiler-generated code via CallLeafNoFP,

src/hotspot/share/c1/c1_Instruction.cpp

@@ -837,18 +837,10 @@ bool BlockBegin::try_merge(ValueStack* new_state) {
           existing_state->invalidate_local(index);
           TRACE_PHI(tty->print_cr("invalidating local %d because of type mismatch", index));
         }
-      }
 
-      for_each_stack_value(existing_state, index, existing_value) {
-        if ( !(existing_value->as_Phi() != NULL && existing_value->as_Phi()->block() == this)) {
-          TRACE_PHI(tty->print_cr("Re-entered loop head without existing phi for stack - bailout"));
-          return false;
-        }
-      }
-      for_each_local_value(existing_state, index, existing_value) {
-        if (!(existing_value == new_state->local_at(index) || (existing_value->as_Phi() != NULL && existing_value->as_Phi()->as_Phi()->block() == this))) {
-          TRACE_PHI(tty->print_cr("Re-entered loop head without existing phi for modified local - bailout"));
-          return false;
+        if (existing_value != new_state->local_at(index) && existing_value->as_Phi() == NULL) {
+          TRACE_PHI(tty->print_cr("required phi for local %d is missing, irreducible loop?", index));
+          return false; // BAILOUT in caller
         }
       }
 

src/hotspot/share/cds/lambdaFormInvokers.cpp

@@ -178,6 +178,7 @@ void LambdaFormInvokers::reload_class(char* name, ClassFileStream& st, TRAPS) {
                                                    class_name,
                                                    cld,
                                                    cl_info,
+                                                   false, // pick_newest
                                                    CHECK);
 
   {

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_CI_CIKLASS_HPP

src/hotspot/share/ci/ciObjectFactory.cpp

@@ -74,7 +74,10 @@ GrowableArray<ciMetadata*>* ciObjectFactory::_shared_ci_metadata = NULL;
 ciSymbol*                 ciObjectFactory::_shared_ci_symbols[vmSymbols::number_of_symbols()];
 int                       ciObjectFactory::_shared_ident_limit = 0;
 volatile bool             ciObjectFactory::_initialized = false;
+volatile bool             ciObjectFactory::_reinitialize_vm_klasses = false;
 
+// TODO: review...
+Arena* ciObjectFactory::_initial_arena = NULL;
 
 // ------------------------------------------------------------------
 // ciObjectFactory::ciObjectFactory
@@ -110,6 +113,7 @@ 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();
@@ -118,6 +122,36 @@ void ciObjectFactory::initialize() {
 
 }
 
+// (DCEVM) vm classes could be modified
+void ciObjectFactory::reinitialize_vm_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_vm_classes();
+  _reinitialize_vm_klasses = false;
+}
+
+// (DCEVM) vm classes could be modified
+void ciObjectFactory::do_reinitialize_vm_classes() {
+#define VM_CLASS_DEFN(name, ignore_s)   \
+  if (ciEnv::_##name != NULL && ciEnv::_##name->new_version() != NULL) { \
+    int old_ident = ciEnv::_##name->ident(); \
+    ciEnv::_##name = get_metadata(vmClasses::name())->as_instance_klass(); \
+    ciEnv::_##name->compute_nonstatic_fields(); \
+    ciEnv::_##name->set_ident(old_ident); \
+  }
+
+  VM_CLASSES_DO(VM_CLASS_DEFN)
+#undef VM_CLASS_DEFN
+}
+
 void ciObjectFactory::init_shared_objects() {
 
   _next_ident = 1;  // start numbering CI objects at 1
@@ -716,3 +750,28 @@ void ciObjectFactory::print() {
              _unloaded_instances.length(),
              _unloaded_klasses.length());
 }
+
+
+int ciObjectFactory::compare_cimetadata(ciMetadata** a, ciMetadata** b) {
+  Metadata* am = (*a)->constant_encoding();
+  Metadata* bm = (*b)->constant_encoding();
+  return ((am > bm) ? 1 : ((am == bm) ? 0 : -1));
+}
+
+// FIXME: review... Resoring the ciObject arrays after class redefinition
+void ciObjectFactory::resort_shared_ci_metadata() {
+  if (_shared_ci_metadata == NULL) return;
+  _shared_ci_metadata->sort(ciObjectFactory::compare_cimetadata);
+
+#ifdef ASSERT
+  if (CIObjectFactoryVerify) {
+    Metadata* last = NULL;
+    for (int j = 0; j< _shared_ci_metadata->length(); j++) {
+      Metadata* o = _shared_ci_metadata->at(j)->constant_encoding();
+      assert(last < o, "out of order");
+      last = o;
+    }
+  }
+#endif // ASSERT
+}
+

src/hotspot/share/ci/ciObjectFactory.hpp

@@ -42,9 +42,11 @@ class ciObjectFactory : public ResourceObj {
 
 private:
   static volatile bool _initialized;
+  static volatile bool _reinitialize_vm_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 +91,15 @@ private:
 
   ciInstance* get_unloaded_instance(ciInstanceKlass* klass);
 
+  static int compare_cimetadata(ciMetadata** a, ciMetadata** b);
+  void do_reinitialize_vm_classes();
 public:
   static bool is_initialized() { return _initialized; }
+  static bool is_reinitialize_vm_klasses() { return _reinitialize_vm_klasses; }
+  static void set_reinitialize_vm_klasses() { _reinitialize_vm_klasses = true; }
 
   static void initialize();
+  static void reinitialize_vm_classes();
   void init_shared_objects();
   void remove_symbols();
 
@@ -145,6 +152,8 @@ public:
 
   void print_contents();
   void print();
+
+  static void resort_shared_ci_metadata();
 };
 
 #endif // SHARE_CI_CIOBJECTFACTORY_HPP

src/hotspot/share/classfile/classFileParser.cpp

@@ -852,6 +852,9 @@ void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
                                                   CHECK);
       }
 
+      // (DCEVM) pick newest
+      interf = (Klass *) maybe_newest(interf);
+
       if (!interf->is_interface()) {
         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
@@ -4017,7 +4020,8 @@ const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
     // However, make sure it is not an array type.
     bool is_array = false;
     if (cp->tag_at(super_class_index).is_klass()) {
-      super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
+      // (DCEVM) pick newest
+      super_klass = InstanceKlass::cast(maybe_newest(cp->resolved_klass_at(super_class_index)));
       if (need_verify)
         is_array = super_klass->is_array_klass();
     } else if (need_verify) {
@@ -4157,7 +4161,10 @@ void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
   if (!_has_empty_finalizer) {
     if (_has_finalizer ||
         (super != NULL && super->has_finalizer())) {
-      ik->set_has_finalizer();
+        // FIXME - (DCEVM) this is condition from previous DCEVM version, however after reload a new finalize() method is not active
+        if (ik->old_version() == NULL || ik->old_version()->has_finalizer()) {
+          ik->set_has_finalizer();
+        }
     }
   }
 
@@ -5504,6 +5511,7 @@ ClassFileParser::ClassFileParser(ClassFileStream* stream,
                                  ClassLoaderData* loader_data,
                                  const ClassLoadInfo* cl_info,
                                  Publicity pub_level,
+                                 const bool pick_newest,
                                  TRAPS) :
   _stream(stream),
   _class_name(NULL),
@@ -5562,7 +5570,8 @@ ClassFileParser::ClassFileParser(ClassFileStream* stream,
   _has_finalizer(false),
   _has_empty_finalizer(false),
   _has_vanilla_constructor(false),
-  _max_bootstrap_specifier_index(-1) {
+  _max_bootstrap_specifier_index(-1),
+  _pick_newest(pick_newest) {
 
   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
   _class_name->increment_refcount();
@@ -5961,14 +5970,15 @@ void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const st
         CHECK);
     }
     Handle loader(THREAD, _loader_data->class_loader());
-    _super_klass = (const InstanceKlass*)
+    const Klass* super_klass =
                        SystemDictionary::resolve_super_or_fail(_class_name,
                                                                super_class_name,
                                                                loader,
                                                                _protection_domain,
                                                                true,
                                                                CHECK);
-  }
+   _super_klass = (const InstanceKlass*) maybe_newest(super_klass);
+ }
 
   if (_super_klass != NULL) {
     if (_super_klass->has_nonstatic_concrete_methods()) {

src/hotspot/share/classfile/classFileParser.hpp

@@ -198,6 +198,9 @@ class ClassFileParser {
   bool _has_vanilla_constructor;
   int _max_bootstrap_specifier_index;  // detects BSS values
 
+  // (DCEVM) Enhanced class redefinition
+  const bool _pick_newest;
+
   void parse_stream(const ClassFileStream* const stream, TRAPS);
 
   void mangle_hidden_class_name(InstanceKlass* const ik);
@@ -525,6 +528,8 @@ class ClassFileParser {
                                TRAPS);
 
   void update_class_name(Symbol* new_name);
+  // (DCEVM) Enhanced class redefinition
+  inline const Klass* maybe_newest(const Klass* klass) const { return klass != NULL && _pick_newest ? klass->newest_version() : klass; }
 
  public:
   ClassFileParser(ClassFileStream* stream,
@@ -532,6 +537,7 @@ class ClassFileParser {
                   ClassLoaderData* loader_data,
                   const ClassLoadInfo* cl_info,
                   Publicity pub_level,
+                  const bool pick_newest,
                   TRAPS);
 
   ~ClassFileParser();
@@ -557,6 +563,7 @@ class ClassFileParser {
   ClassLoaderData* loader_data() const { return _loader_data; }
   const Symbol* class_name() const { return _class_name; }
   const InstanceKlass* super_klass() const { return _super_klass; }
+  Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
 
   ReferenceType reference_type() const { return _rt; }
   AccessFlags access_flags() const { return _access_flags; }

src/hotspot/share/classfile/classLoader.cpp

@@ -1223,6 +1223,7 @@ InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TR
                                                            name,
                                                            loader_data,
                                                            cl_info,
+                                                           false, // pick_newest
                                                            CHECK_NULL);
   result->set_classpath_index(classpath_index);
   return result;

src/hotspot/share/classfile/classLoaderData.cpp

@@ -337,6 +337,16 @@ void ClassLoaderData::classes_do(KlassClosure* klass_closure) {
   }
 }
 
+void ClassLoaderData::initialized_classes_do(KlassClosure* klass_closure) {
+  // Lock-free access requires load_acquire
+  for (Klass* k = Atomic::load_acquire(&_klasses); k != NULL; k = k->next_link()) {
+    if (k->is_instance_klass() && InstanceKlass::cast(k)->is_initialized()) {
+      klass_closure->do_klass(k);
+    }
+    assert(k != k->next_link(), "no loops!");
+  }
+}
+
 void ClassLoaderData::classes_do(void f(Klass * const)) {
   // Lock-free access requires load_acquire
   for (Klass* k = Atomic::load_acquire(&_klasses); k != NULL; k = k->next_link()) {
@@ -599,6 +609,15 @@ Dictionary* ClassLoaderData::create_dictionary() {
   return new Dictionary(this, size, resizable);
 }
 
+void ClassLoaderData::exchange_holders(ClassLoaderData* cld) {
+  oop holder_oop = _holder.peek();
+  _holder.replace(cld->_holder.peek());
+  cld->_holder.replace(holder_oop);
+  WeakHandle exchange = _holder;
+  _holder = cld->_holder;
+  cld->_holder = exchange;
+}
+
 // Tell the GC to keep this klass alive while iterating ClassLoaderDataGraph
 oop ClassLoaderData::holder_phantom() const {
   // A klass that was previously considered dead can be looked up in the

src/hotspot/share/classfile/classLoaderData.hpp

@@ -175,7 +175,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
 
   oop holder_no_keepalive() const;
   oop holder_phantom() const;
-
+  void exchange_holders(ClassLoaderData* cld);
  private:
   void unload();
   bool keep_alive() const       { return _keep_alive > 0; }
@@ -272,6 +272,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
   void oops_do(OopClosure* f, int claim_value, bool clear_modified_oops = false);
 
   void classes_do(KlassClosure* klass_closure);
+  void initialized_classes_do(KlassClosure* klass_closure);
   Klass* klasses() { return _klasses; }
 
   JNIMethodBlock* jmethod_ids() const              { return _jmethod_ids; }

src/hotspot/share/classfile/classLoaderDataGraph.cpp

@@ -361,6 +361,13 @@ void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
   }
 }
 
+void ClassLoaderDataGraph::initialized_classes_do(KlassClosure* klass_closure) {
+  ClassLoaderDataGraphIterator iter;
+  while (ClassLoaderData* cld = iter.get_next()) {
+    cld->initialized_classes_do(klass_closure);
+  }
+}
+
 void ClassLoaderDataGraph::classes_do(void f(Klass* const)) {
   ClassLoaderDataGraphIterator iter;
   while (ClassLoaderData* cld = iter.get_next()) {
@@ -441,6 +448,29 @@ void ClassLoaderDataGraph::dictionary_classes_do(void f(InstanceKlass*, TRAPS),
   }
 }
 
+// (DCEVM) - iterate over dict classes
+void ClassLoaderDataGraph::dictionary_classes_do(KlassClosure* klass_closure) {
+  FOR_ALL_DICTIONARY(cld) {
+    cld->dictionary()->classes_do(klass_closure);
+  }
+}
+
+// (DCEVM) rollback redefined classes
+void ClassLoaderDataGraph::rollback_redefinition() {
+  FOR_ALL_DICTIONARY(cld) {
+    cld->dictionary()->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;
+}
+
 void ClassLoaderDataGraph::verify_dictionary() {
   FOR_ALL_DICTIONARY(cld) {
     cld->dictionary()->verify();

src/hotspot/share/classfile/classLoaderDataGraph.hpp

@@ -78,6 +78,10 @@ class ClassLoaderDataGraph : public AllStatic {
   // for redefinition.  These classes are removed during the next class unloading.
   // Walking the ClassLoaderDataGraph also includes hidden classes.
   static void classes_do(KlassClosure* klass_closure);
+
+  // Enhanced class redefinition
+  static void initialized_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*));
@@ -103,6 +107,14 @@ class ClassLoaderDataGraph : public AllStatic {
   // Added for initialize_itable_for_klass to handle exceptions.
   static void dictionary_classes_do(void f(InstanceKlass*, TRAPS), TRAPS);
 
+  static void dictionary_classes_do(KlassClosure* klass_closure);
+
+  // (DCEVM) Enhanced class redefinition
+  static void rollback_redefinition();
+
+  // Enhanced class redefinition
+  static bool dictionary_classes_do_update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass);
+
   // VM_CounterDecay iteration support
   static InstanceKlass* try_get_next_class();
   static void adjust_saved_class(ClassLoaderData* cld);

src/hotspot/share/classfile/classLoaderExt.cpp

@@ -290,6 +290,7 @@ InstanceKlass* ClassLoaderExt::load_class(Symbol* name, const char* path, TRAPS)
                                                       name,
                                                       loader_data,
                                                       cl_info,
+                                                      false,
                                                       CHECK_NULL);
   return k;
 }

src/hotspot/share/classfile/dictionary.cpp

@@ -225,6 +225,21 @@ void Dictionary::classes_do(void f(InstanceKlass*)) {
   }
 }
 
+
+// (DCEVM) iterate over dict entry
+void Dictionary::classes_do(KlassClosure* closure) {
+  for (int index = 0; index < table_size(); index++) {
+    for (DictionaryEntry* probe = bucket(index);
+                          probe != NULL;
+                          probe = probe->next()) {
+      InstanceKlass* k = probe->instance_klass();
+      if (loader_data() == k->class_loader_data()) {
+        closure->do_klass(k);
+      }
+    }
+  }
+}
+
 // Added for initialize_itable_for_klass to handle exceptions
 //   Just the classes from defining class loaders
 void Dictionary::classes_do(void f(InstanceKlass*, TRAPS), TRAPS) {
@@ -306,6 +321,35 @@ DictionaryEntry* Dictionary::get_entry(int index, unsigned int hash,
   return NULL;
 }
 
+// (DCEVM) replace old_class by new class in dictionary
+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++) {
+    for (DictionaryEntry* entry = bucket(index); entry != NULL; entry = entry->next()) {
+      if (entry->instance_klass() == old_klass) {
+        entry->set_literal(k);
+        found = true;
+      }
+    }
+  }
+  return found;
+}
+
+// (DCEVM) rollback redefinition
+void Dictionary::rollback_redefinition() {
+  for (int index = 0; index < table_size(); index++) {
+    for (DictionaryEntry* entry = bucket(index);
+                          entry != NULL;
+                          entry = entry->next()) {
+      if (entry->instance_klass()->is_redefining()) {
+        entry->set_literal((InstanceKlass*) entry->instance_klass()->old_version());
+      }
+    }
+  }
+}
+
+
 
 
 InstanceKlass* Dictionary::find(unsigned int hash, Symbol* name,
@@ -315,7 +359,7 @@ 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 entry->instance_klass();
+    return old_if_redefining(entry->instance_klass());
   } else {
     return NULL;
   }
@@ -329,7 +373,7 @@ InstanceKlass* Dictionary::find_class(unsigned int hash,
   assert (index == index_for(name), "incorrect index?");
 
   DictionaryEntry* entry = get_entry(index, hash, name);
-  return (entry != NULL) ? entry->instance_klass() : NULL;
+  return old_if_redefining((entry != NULL) ? entry->instance_klass() : NULL);
 }
 
 void Dictionary::add_protection_domain(int index, unsigned int hash,

src/hotspot/share/classfile/dictionary.hpp

@@ -64,6 +64,7 @@ public:
   InstanceKlass* find_class(unsigned int hash, Symbol* name);
 
   void classes_do(void f(InstanceKlass*));
+  void classes_do(KlassClosure* closure);
   void classes_do(void f(InstanceKlass*, TRAPS), TRAPS);
   void all_entries_do(KlassClosure* closure);
   void classes_do(MetaspaceClosure* it);
@@ -81,6 +82,11 @@ public:
   void print_on(outputStream* st) const;
   void verify();
 
+  // (DCEVM) Enhanced class redefinition
+  bool update_klass(Symbol* name, InstanceKlass* k, InstanceKlass* old_klass);
+
+  void rollback_redefinition();
+
  private:
   DictionaryEntry* new_entry(unsigned int hash, InstanceKlass* klass);
 
@@ -101,6 +107,11 @@ public:
   void add_protection_domain(int index, unsigned int hash,
                              InstanceKlass* klass,
                              Handle protection_domain);
+
+  // (DCEVM) return old class if redefining in AllowEnhancedClassRedefinition, otherwise return "k"
+  static InstanceKlass* old_if_redefining(InstanceKlass* k) {
+    return (k != NULL && k->is_redefining()) ? ((InstanceKlass* )k->old_version()) : k;
+  }
 };
 
 // An entry in the class loader data dictionaries, this describes a class as

src/hotspot/share/classfile/javaClasses.cpp

@@ -2594,6 +2594,8 @@ void java_lang_Throwable::fill_in_stack_trace(Handle throwable, const methodHand
         skip_throwableInit_check = true;
       }
     }
+    // (DCEVM): Line numbers from newest version must be used for EMCP-swapped methods
+    method = method->newest_version();
     if (method->is_hidden()) {
       if (skip_hidden) {
         if (total_count == 0) {
@@ -3807,6 +3809,62 @@ void java_lang_invoke_DirectMethodHandle::serialize_offsets(SerializeClosure* f)
 }
 #endif
 
+// Support for java_lang_invoke_DirectMethodHandle$StaticAccessor
+
+int java_lang_invoke_DirectMethodHandle_StaticAccessor::_static_offset_offset;
+
+long java_lang_invoke_DirectMethodHandle_StaticAccessor::static_offset(oop dmh) {
+  assert(_static_offset_offset != 0, "");
+  return dmh->long_field(_static_offset_offset);
+}
+
+void java_lang_invoke_DirectMethodHandle_StaticAccessor::set_static_offset(oop dmh, long static_offset) {
+  assert(_static_offset_offset != 0, "");
+  dmh->long_field_put(_static_offset_offset, static_offset);
+}
+
+#define DIRECTMETHODHANDLE_STATIC_ACCESSOR_FIELDS_DO(macro) \
+  macro(_static_offset_offset, k, vmSymbols::static_offset_name(), long_signature, false)
+
+void java_lang_invoke_DirectMethodHandle_StaticAccessor::compute_offsets() {
+  InstanceKlass* k = vmClasses::DirectMethodHandle_StaticAccessor_klass();
+  DIRECTMETHODHANDLE_STATIC_ACCESSOR_FIELDS_DO(FIELD_COMPUTE_OFFSET);
+}
+
+#if INCLUDE_CDS
+void java_lang_invoke_DirectMethodHandle_StaticAccessor::serialize_offsets(SerializeClosure* f) {
+  DIRECTMETHODHANDLE_STATIC_ACCESSOR_FIELDS_DO(FIELD_SERIALIZE_OFFSET);
+}
+#endif
+
+// Support for java_lang_invoke_DirectMethodHandle$Accessor
+
+int java_lang_invoke_DirectMethodHandle_Accessor::_field_offset_offset;
+
+int java_lang_invoke_DirectMethodHandle_Accessor::field_offset(oop dmh) {
+  assert(_field_offset_offset != 0, "");
+  return dmh->int_field(_field_offset_offset);
+}
+
+void java_lang_invoke_DirectMethodHandle_Accessor::set_field_offset(oop dmh, int field_offset) {
+  assert(_field_offset_offset != 0, "");
+  dmh->int_field_put(_field_offset_offset, field_offset);
+}
+
+#define DIRECTMETHODHANDLE_ACCESSOR_FIELDS_DO(macro) \
+  macro(_field_offset_offset, k, vmSymbols::field_offset_name(), int_signature, false)
+
+void java_lang_invoke_DirectMethodHandle_Accessor::compute_offsets() {
+  InstanceKlass* k = vmClasses::DirectMethodHandle_Accessor_klass();
+  DIRECTMETHODHANDLE_ACCESSOR_FIELDS_DO(FIELD_COMPUTE_OFFSET);
+}
+
+#if INCLUDE_CDS
+void java_lang_invoke_DirectMethodHandle_Accessor::serialize_offsets(SerializeClosure* f) {
+  DIRECTMETHODHANDLE_ACCESSOR_FIELDS_DO(FIELD_SERIALIZE_OFFSET);
+}
+#endif
+
 // Support for java_lang_invoke_MethodHandle
 
 int java_lang_invoke_MethodHandle::_type_offset;

src/hotspot/share/classfile/javaClasses.hpp

@@ -59,6 +59,8 @@ class RecordComponent;
   f(java_lang_invoke_MethodType) \
   f(java_lang_invoke_CallSite) \
   f(java_lang_invoke_ConstantCallSite) \
+  f(java_lang_invoke_DirectMethodHandle_StaticAccessor) \
+  f(java_lang_invoke_DirectMethodHandle_Accessor) \
   f(java_lang_invoke_MethodHandleNatives_CallSiteContext) \
   f(java_security_AccessControlContext) \
   f(java_lang_reflect_AccessibleObject) \
@@ -293,7 +295,9 @@ class java_lang_Class : AllStatic {
   static void set_init_lock(oop java_class, oop init_lock);
   static void set_protection_domain(oop java_class, oop protection_domain);
   static void set_class_loader(oop java_class, oop class_loader);
+ public: // DCEVM
   static void set_component_mirror(oop java_class, oop comp_mirror);
+ private:
   static void initialize_mirror_fields(Klass* k, Handle mirror, Handle protection_domain,
                                        Handle classData, TRAPS);
   static void set_mirror_module_field(JavaThread* current, Klass* K, Handle mirror, Handle module);
@@ -1008,6 +1012,55 @@ class java_lang_invoke_DirectMethodHandle: AllStatic {
   static int member_offset()           { CHECK_INIT(_member_offset); }
 };
 
+// Interface to java.lang.invoke.DirectMethodHandle$StaticAccessor objects
+
+class java_lang_invoke_DirectMethodHandle_StaticAccessor: AllStatic {
+  friend class JavaClasses;
+
+ private:
+  static int _static_offset_offset;               // offset to static field
+
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static long      static_offset(oop dmh);
+  static void  set_static_offset(oop dmh, long value);
+
+  // Testers
+  static bool is_subclass(Klass* klass) {
+    return klass->is_subclass_of(vmClasses::DirectMethodHandle_StaticAccessor_klass());
+  }
+  static bool is_instance(oop obj);
+
+  static void serialize_offsets(SerializeClosure* f) NOT_CDS_RETURN;
+};
+
+// Interface to java.lang.invoke.DirectMethodHandle$Accessor objects
+
+class java_lang_invoke_DirectMethodHandle_Accessor: AllStatic {
+  friend class JavaClasses;
+
+ private:
+  static int _field_offset_offset;               // offset to field
+
+  static void compute_offsets();
+
+ public:
+  // Accessors
+  static int      field_offset(oop dmh);
+  static void set_field_offset(oop dmh, int value);
+
+  // Testers
+  static bool is_subclass(Klass* klass) {
+    return klass->is_subclass_of(vmClasses::DirectMethodHandle_Accessor_klass());
+  }
+  static bool is_instance(oop obj);
+
+  static void serialize_offsets(SerializeClosure* f) NOT_CDS_RETURN;
+};
+
+
 // Interface to java.lang.invoke.LambdaForm objects
 // (These are a private interface for managing adapter code generation.)
 

src/hotspot/share/classfile/javaClasses.inline.hpp

@@ -272,6 +272,14 @@ inline bool java_lang_invoke_DirectMethodHandle::is_instance(oop obj) {
   return obj != NULL && is_subclass(obj->klass());
 }
 
+inline bool java_lang_invoke_DirectMethodHandle_StaticAccessor::is_instance(oop obj) {
+  return obj != NULL && is_subclass(obj->klass());
+}
+
+inline bool java_lang_invoke_DirectMethodHandle_Accessor::is_instance(oop obj) {
+  return obj != NULL && is_subclass(obj->klass());
+}
+
 inline bool java_lang_Module::is_instance(oop obj) {
   return obj != NULL && obj->klass() == vmClasses::Module_klass();
 }

src/hotspot/share/classfile/klassFactory.cpp

@@ -85,6 +85,7 @@ InstanceKlass* KlassFactory::check_shared_class_file_load_hook(
                              loader_data,
                              &cl_info,
                              ClassFileParser::BROADCAST, // publicity level
+                             false,
                              CHECK_NULL);
       const ClassInstanceInfo* cl_inst_info = cl_info.class_hidden_info_ptr();
       InstanceKlass* new_ik = parser.create_instance_klass(true, // changed_by_loadhook
@@ -167,6 +168,7 @@ InstanceKlass* KlassFactory::create_from_stream(ClassFileStream* stream,
                                                 Symbol* name,
                                                 ClassLoaderData* loader_data,
                                                 const ClassLoadInfo& cl_info,
+                                                const bool pick_newest,
                                                 TRAPS) {
   assert(stream != NULL, "invariant");
   assert(loader_data != NULL, "invariant");
@@ -196,6 +198,7 @@ InstanceKlass* KlassFactory::create_from_stream(ClassFileStream* stream,
                          loader_data,
                          &cl_info,
                          ClassFileParser::BROADCAST, // publicity level
+                         pick_newest,
                          CHECK_NULL);
 
   const ClassInstanceInfo* cl_inst_info = cl_info.class_hidden_info_ptr();

src/hotspot/share/classfile/klassFactory.hpp

@@ -64,6 +64,7 @@ class KlassFactory : AllStatic {
                                            Symbol* name,
                                            ClassLoaderData* loader_data,
                                            const ClassLoadInfo& cl_info,
+                                           const bool pick_newest,
                                            TRAPS);
   static InstanceKlass* check_shared_class_file_load_hook(
                                           InstanceKlass* ik,

src/hotspot/share/classfile/loaderConstraints.cpp

@@ -4,7 +4,7 @@
  *
  * 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.
+ * published by the Free Software Foundation) replace old_class by new class in dictionary.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
@@ -92,6 +92,20 @@ LoaderConstraintEntry** LoaderConstraintTable::find_loader_constraint(
   return pp;
 }
 
+// (DCEVM) update constraint entries to new classes, called from dcevm redefinition code only
+void LoaderConstraintTable::update_after_redefinition() {
+  for (int index = 0; index < table_size(); index++) {
+    LoaderConstraintEntry** p = bucket_addr(index);
+    while(*p) {
+      LoaderConstraintEntry* probe = *p;
+      if (probe->klass() != NULL) {
+        // We swap the class with the newest version with an assumption that the hash will be the same
+        probe->set_klass((InstanceKlass*) probe->klass()->newest_version());
+      }
+      p = probe->next_addr();
+    }
+  }
+}
 
 void LoaderConstraintTable::purge_loader_constraints() {
   assert_locked_or_safepoint(SystemDictionary_lock);
@@ -446,7 +460,7 @@ void LoaderConstraintTable::verify(PlaceholderTable* placeholders) {
         if (k != NULL) {
           // We found the class in the dictionary, so we should
           // make sure that the Klass* matches what we already have.
-          guarantee(k == probe->klass(), "klass should be in dictionary");
+          guarantee(k == probe->klass()->newest_version(), "klass should be in dictionary");
         } else {
           // If we don't find the class in the dictionary, it
           // has to be in the placeholders table.

src/hotspot/share/classfile/loaderConstraints.hpp

@@ -55,6 +55,9 @@ public:
     return (LoaderConstraintEntry**)Hashtable<InstanceKlass*, mtClass>::bucket_addr(i);
   }
 
+  // (DCEVM) update all klasses with newest version
+  void update_after_redefinition();
+
   // Check class loader constraints
   bool add_entry(Symbol* name, InstanceKlass* klass1, Handle loader1,
                                     InstanceKlass* klass2, Handle loader2);

src/hotspot/share/classfile/systemDictionary.cpp

@@ -229,7 +229,7 @@ void verify_dictionary_entry(Symbol* class_name, InstanceKlass* k) {
   assert(class_name == k->name(), "Must be the same");
   unsigned int name_hash = dictionary->compute_hash(class_name);
   InstanceKlass* kk = dictionary->find_class(name_hash, class_name);
-  assert(kk == k, "should be present in dictionary");
+  assert((kk == k && !k->is_redefining()) || (k->is_redefining() && kk == k->old_version()), "should be present in the dictionary");
 }
 #endif
 
@@ -266,6 +266,7 @@ Klass* SystemDictionary::resolve_or_fail(Symbol* class_name, Handle class_loader
   if (HAS_PENDING_EXCEPTION || klass == NULL) {
     handle_resolution_exception(class_name, throw_error, CHECK_NULL);
   }
+  assert(klass == NULL || klass->new_version() == NULL || klass->newest_version()->is_redefining(), "must be");
   return klass;
 }
 
@@ -824,11 +825,14 @@ InstanceKlass* SystemDictionary::resolve_hidden_class_from_stream(
                                                      Symbol* class_name,
                                                      Handle class_loader,
                                                      const ClassLoadInfo& cl_info,
+                                                     InstanceKlass* old_klass,
                                                      TRAPS) {
 
   EventClassLoad class_load_start_event;
   ClassLoaderData* loader_data;
 
+  bool is_redefining = (old_klass != NULL);
+
   // - for hidden classes that are not strong: create a new CLD that has a class holder and
   //                                           whose loader is the Lookup class's loader.
   // - for hidden class: add the class to the Lookup class's loader's CLD.
@@ -844,8 +848,13 @@ InstanceKlass* SystemDictionary::resolve_hidden_class_from_stream(
                                                       class_name,
                                                       loader_data,
                                                       cl_info,
+                                                      is_redefining, // pick_newest
                                                       CHECK_NULL);
   assert(k != NULL, "no klass created");
+  if (is_redefining && k != NULL) {
+    k->set_redefining(true);
+    k->set_old_version(old_klass);
+  }
 
   // Hidden classes that are not strong must update ClassLoaderData holder
   // so that they can be unloaded when the mirror is no longer referenced.
@@ -884,10 +893,12 @@ InstanceKlass* SystemDictionary::resolve_class_from_stream(
                                                      Symbol* class_name,
                                                      Handle class_loader,
                                                      const ClassLoadInfo& cl_info,
+                                                     InstanceKlass* old_klass,
                                                      TRAPS) {
 
   HandleMark hm(THREAD);
 
+  bool is_redefining = (old_klass != NULL);
   ClassLoaderData* loader_data = register_loader(class_loader);
 
   // Classloaders that support parallelism, e.g. bootstrap classloader,
@@ -902,6 +913,7 @@ InstanceKlass* SystemDictionary::resolve_class_from_stream(
  InstanceKlass* k = NULL;
 
 #if INCLUDE_CDS
+  // FIXME: (DCEVM) what to do during redefinition?
   if (!DumpSharedSpaces) {
     k = SystemDictionaryShared::lookup_from_stream(class_name,
                                                    class_loader,
@@ -912,7 +924,12 @@ InstanceKlass* SystemDictionary::resolve_class_from_stream(
 #endif
 
   if (k == NULL) {
-    k = KlassFactory::create_from_stream(st, class_name, loader_data, cl_info, CHECK_NULL);
+    k = KlassFactory::create_from_stream(st, class_name, loader_data, cl_info, is_redefining, CHECK_NULL);
+  }
+
+  if (is_redefining && k != NULL) {
+    k->set_redefining(true);
+    k->set_old_version(old_klass);
   }
 
   assert(k != NULL, "no klass created");
@@ -923,10 +940,10 @@ InstanceKlass* SystemDictionary::resolve_class_from_stream(
   // If a class loader supports parallel classloading, handle parallel define requests.
   // find_or_define_instance_class may return a different InstanceKlass,
   // in which case the old k would be deallocated
-  if (is_parallelCapable(class_loader)) {
+  if (is_parallelCapable(class_loader) && !is_redefining) {
     k = find_or_define_instance_class(h_name, class_loader, k, CHECK_NULL);
   } else {
-    define_instance_class(k, class_loader, THREAD);
+    define_instance_class(k, old_klass, class_loader, THREAD);
 
     // If defining the class throws an exception register 'k' for cleanup.
     if (HAS_PENDING_EXCEPTION) {
@@ -946,11 +963,12 @@ InstanceKlass* SystemDictionary::resolve_from_stream(ClassFileStream* st,
                                                      Symbol* class_name,
                                                      Handle class_loader,
                                                      const ClassLoadInfo& cl_info,
+                                                     InstanceKlass* old_klass,
                                                      TRAPS) {
   if (cl_info.is_hidden()) {
-    return resolve_hidden_class_from_stream(st, class_name, class_loader, cl_info, CHECK_NULL);
+    return resolve_hidden_class_from_stream(st, class_name, class_loader, cl_info, old_klass, CHECK_NULL);
   } else {
-    return resolve_class_from_stream(st, class_name, class_loader, cl_info, CHECK_NULL);
+    return resolve_class_from_stream(st, class_name, class_loader, cl_info, old_klass, CHECK_NULL);
   }
 }
 
@@ -1392,10 +1410,11 @@ static void post_class_define_event(InstanceKlass* k, const ClassLoaderData* def
   }
 }
 
-void SystemDictionary::define_instance_class(InstanceKlass* k, Handle class_loader, TRAPS) {
+void SystemDictionary::define_instance_class(InstanceKlass* k, InstanceKlass* old_klass, Handle class_loader, TRAPS) {
 
   ClassLoaderData* loader_data = k->class_loader_data();
   assert(loader_data->class_loader() == class_loader(), "they must be the same");
+  bool is_redefining = (old_klass != NULL);
 
   // Bootstrap and other parallel classloaders don't acquire a lock,
   // they use placeholder token.
@@ -1419,8 +1438,17 @@ void SystemDictionary::define_instance_class(InstanceKlass* k, Handle class_load
   // which will require a token to perform the define class
   Symbol*  name_h = k->name();
   Dictionary* dictionary = loader_data->dictionary();
+
   unsigned int name_hash = dictionary->compute_hash(name_h);
-  check_constraints(name_hash, k, class_loader, true, CHECK);
+  if (is_redefining) {
+    // 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
+    ClassLoaderDataGraph_lock->lock();
+    bool ok = ClassLoaderDataGraph::dictionary_classes_do_update_klass(name_h, k, old_klass);
+    ClassLoaderDataGraph_lock->unlock();
+    assert (ok, "must have found old class and updated!");
+  }
+  check_constraints(name_hash, k, class_loader, !is_redefining, CHECK);
 
   // Register class just loaded with class loader (placed in ArrayList)
   // Note we do this before updating the dictionary, as this can
@@ -1449,7 +1477,7 @@ void SystemDictionary::define_instance_class(InstanceKlass* k, Handle class_load
   k->eager_initialize(THREAD);
 
   // notify jvmti
-  if (JvmtiExport::should_post_class_load()) {
+  if (!is_redefining && JvmtiExport::should_post_class_load()) {
     JvmtiExport::post_class_load(THREAD, k);
   }
   post_class_define_event(k, loader_data);
@@ -1524,7 +1552,7 @@ InstanceKlass* SystemDictionary::find_or_define_helper(Symbol* class_name, Handl
     }
   }
 
-  define_instance_class(k, class_loader, THREAD);
+  define_instance_class(k, NULL, class_loader, THREAD);
 
   // definer must notify any waiting threads
   {
@@ -1587,6 +1615,19 @@ void SystemDictionary::add_to_hierarchy(InstanceKlass* k) {
   }
 }
 
+// (DCEVM) - remove from klass hierarchy
+void SystemDictionary::remove_from_hierarchy(InstanceKlass* k) {
+    assert(k != NULL, "just checking");
+
+  // remove receiver from sibling list
+  k->remove_from_sibling_list();
+}
+
+// (DCEVM)
+void SystemDictionary::update_constraints_after_redefinition() {
+  constraints()->update_after_redefinition();
+}
+
 // ----------------------------------------------------------------------------
 // GC support
 
@@ -1687,7 +1728,7 @@ void SystemDictionary::check_constraints(unsigned int name_hash,
       // else - ok, class loaded by a different thread in parallel.
       // We should only have found it if it was done loading and ok to use.
 
-      if ((defining == true) || (k != check)) {
+      if ((defining == true) || (k != check && (!AllowEnhancedClassRedefinition || k->old_version() != check))) {
         throwException = true;
         ss.print("loader %s", loader_data->loader_name_and_id());
         ss.print(" attempted duplicate %s definition for %s. (%s)",

src/hotspot/share/classfile/systemDictionary.hpp

@@ -124,6 +124,7 @@ class SystemDictionary : AllStatic {
                                                          Symbol* class_name,
                                                          Handle class_loader,
                                                          const ClassLoadInfo& cl_info,
+                                                         InstanceKlass* old_klass,
                                                          TRAPS);
 
   // Resolve a class from stream (called by jni_DefineClass and JVM_DefineClass)
@@ -132,6 +133,7 @@ class SystemDictionary : AllStatic {
                                                   Symbol* class_name,
                                                   Handle class_loader,
                                                   const ClassLoadInfo& cl_info,
+                                                  InstanceKlass* old_klass,
                                                   TRAPS);
 
  public:
@@ -140,6 +142,7 @@ class SystemDictionary : AllStatic {
                                             Symbol* class_name,
                                             Handle class_loader,
                                             const ClassLoadInfo& cl_info,
+                                            InstanceKlass* old_klass,
                                             TRAPS);
 
   // Lookup an already loaded class. If not found NULL is returned.
@@ -202,6 +205,10 @@ class SystemDictionary : AllStatic {
   // Initialization
   static void initialize(TRAPS);
 
+  // (DCEVM) Enhanced class redefinition
+  static void remove_from_hierarchy(InstanceKlass* k);
+  static void update_constraints_after_redefinition();
+
 protected:
   // Returns the class loader data to be used when looking up/updating the
   // system dictionary.
@@ -336,7 +343,7 @@ private:
                                                 Handle lockObject,
                                                 bool* throw_circularity_error);
 
-  static void define_instance_class(InstanceKlass* k, Handle class_loader, TRAPS);
+  static void define_instance_class(InstanceKlass* k, InstanceKlass* old_klass, Handle class_loader, TRAPS);
   static InstanceKlass* find_or_define_helper(Symbol* class_name,
                                               Handle class_loader,
                                               InstanceKlass* k, TRAPS);

src/hotspot/share/classfile/verifier.cpp

@@ -270,7 +270,7 @@ bool Verifier::is_eligible_for_verification(InstanceKlass* klass, bool should_ve
   Symbol* name = klass->name();
   Klass* refl_magic_klass = vmClasses::reflect_MagicAccessorImpl_klass();
 
-  bool is_reflect = refl_magic_klass != NULL && klass->is_subtype_of(refl_magic_klass);
+  bool is_reflect = refl_magic_klass != NULL && (klass->is_subtype_of(refl_magic_klass) || klass->is_subtype_of(refl_magic_klass->newest_version()));
 
   return (should_verify_for(klass->class_loader(), should_verify_class) &&
     // return if the class is a bootstrapping class