From 0b1075c6504aa93a027b1dc84797e7ecaa0880b9 Mon Sep 17 00:00:00 2001
Date: Fri, 22 Jan 2021 15:20:45 +0800
Subject: 8033552:Fix missing missing volatile specifiers in CAS
 operations in GC code

Summary: GC:Fix missing missing volatile specifiers in CAS operations in GC code
LLT: org.openjdk.jcstress.tests.defaultValues.arrays.small.plain.StringTest
Bug url: https://bugs.openjdk.java.net/browse/JDK-8033552
---
 .../concurrentMarkSweep/cmsOopClosures.hpp                | 4 ++--
 .../concurrentMarkSweep/concurrentMarkSweepGeneration.cpp | 8 ++++----
 .../concurrentMarkSweep/concurrentMarkSweepGeneration.hpp | 2 +-
 .../share/vm/gc_implementation/g1/heapRegionRemSet.cpp    | 4 ++--
 hotspot/src/share/vm/gc_implementation/g1/sparsePRT.cpp   | 2 +-
 hotspot/src/share/vm/gc_implementation/g1/sparsePRT.hpp   | 2 +-
 .../parallelScavenge/parallelScavengeHeap.hpp             | 2 +-
 .../vm/gc_implementation/parallelScavenge/psYoungGen.hpp  | 2 +-
 .../parallelScavenge/vmStructs_parallelgc.hpp             | 3 ++-
 .../share/vm/gc_implementation/shared/mutableSpace.hpp    | 4 ++--
 hotspot/src/share/vm/gc_interface/collectedHeap.hpp       | 2 +-
 hotspot/src/share/vm/memory/defNewGeneration.cpp          | 2 +-
 hotspot/src/share/vm/memory/defNewGeneration.hpp          | 2 +-
 hotspot/src/share/vm/memory/genCollectedHeap.cpp          | 2 +-
 hotspot/src/share/vm/memory/genCollectedHeap.hpp          | 2 +-
 hotspot/src/share/vm/memory/generation.hpp                | 2 +-
 hotspot/src/share/vm/runtime/vmStructs.cpp                | 3 +++
 17 files changed, 26 insertions(+), 22 deletions(-)

diff --git a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp
index 5220ee1f3..2697beda2 100644
--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsOopClosures.hpp
@@ -295,7 +295,7 @@ class Par_PushOrMarkClosure: public MetadataAwareOopClosure {
   OopTaskQueue*    _work_queue;
   CMSMarkStack*    _overflow_stack;
   HeapWord*  const _finger;
-  HeapWord** const _global_finger_addr;
+  HeapWord*volatile* const _global_finger_addr;
   Par_MarkFromRootsClosure* const
                    _parent;
  protected:
@@ -307,7 +307,7 @@ class Par_PushOrMarkClosure: public MetadataAwareOopClosure {
                         OopTaskQueue* work_queue,
                         CMSMarkStack* mark_stack,
                         HeapWord* finger,
-                        HeapWord** global_finger_addr,
+                        HeapWord*volatile* global_finger_addr,
                         Par_MarkFromRootsClosure* parent);
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
diff --git a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
index d48e208c5..56fb1c451 100644
--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
@@ -3920,7 +3920,7 @@ class CMSConcMarkingTask: public YieldingFlexibleGangTask {
   bool          _result;
   CompactibleFreeListSpace*  _cms_space;
   char          _pad_front[64];   // padding to ...
-  HeapWord*     _global_finger;   // ... avoid sharing cache line
+  HeapWord* volatile    _global_finger;   // ... avoid sharing cache line
   char          _pad_back[64];
   HeapWord*     _restart_addr;
 
@@ -3959,7 +3959,7 @@ class CMSConcMarkingTask: public YieldingFlexibleGangTask {
 
   OopTaskQueue* work_queue(int i) { return task_queues()->queue(i); }
 
-  HeapWord** global_finger_addr() { return &_global_finger; }
+  HeapWord*volatile* global_finger_addr() { return &_global_finger; }
 
   CMSConcMarkingTerminator* terminator() { return &_term; }
 
@@ -7668,7 +7668,7 @@ void Par_MarkFromRootsClosure::scan_oops_in_oop(HeapWord* ptr) {
 
   // Note: the local finger doesn't advance while we drain
   // the stack below, but the global finger sure can and will.
-  HeapWord** gfa = _task->global_finger_addr();
+  HeapWord*volatile* gfa = _task->global_finger_addr();
   Par_PushOrMarkClosure pushOrMarkClosure(_collector,
                                       _span, _bit_map,
                                       _work_queue,
@@ -7837,7 +7837,7 @@ Par_PushOrMarkClosure::Par_PushOrMarkClosure(CMSCollector* collector,
                      OopTaskQueue* work_queue,
                      CMSMarkStack*  overflow_stack,
                      HeapWord* finger,
-                     HeapWord** global_finger_addr,
+                     HeapWord*volatile* global_finger_addr,
                      Par_MarkFromRootsClosure* parent) :
   MetadataAwareOopClosure(collector->ref_processor()),
   _collector(collector),
diff --git a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp
index c28f8d6c1..8b65d3426 100644
--- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp
+++ b/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp
@@ -750,7 +750,7 @@ class CMSCollector: public CHeapObj<mtGC> {
  private:
   // Support for parallelizing young gen rescan in CMS remark phase
   Generation* _young_gen;  // the younger gen
-  HeapWord** _top_addr;    // ... Top of Eden
+  HeapWord*volatile* _top_addr;    // ... Top of Eden
   HeapWord** _end_addr;    // ... End of Eden
   Mutex*     _eden_chunk_lock;
   HeapWord** _eden_chunk_array; // ... Eden partitioning array
diff --git a/hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp b/hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
index ad8a3562e..8167d2b09 100644
--- a/hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
+++ b/hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
@@ -56,7 +56,7 @@ class PerRegionTable: public CHeapObj<mtGC> {
   PerRegionTable * _collision_list_next;
 
   // Global free list of PRTs
-  static PerRegionTable* _free_list;
+  static PerRegionTable* volatile _free_list;
 
 protected:
   // We need access in order to union things into the base table.
@@ -250,7 +250,7 @@ public:
   static void test_fl_mem_size();
 };
 
-PerRegionTable* PerRegionTable::_free_list = NULL;
+PerRegionTable*volatile  PerRegionTable::_free_list = NULL;
 
 size_t OtherRegionsTable::_max_fine_entries = 0;
 size_t OtherRegionsTable::_mod_max_fine_entries_mask = 0;
diff --git a/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.cpp b/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.cpp
index 1439fe668..b9020002b 100644
--- a/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.cpp
+++ b/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.cpp
@@ -376,7 +376,7 @@ size_t RSHashTable::mem_size() const {
 
 // ----------------------------------------------------------------------
 
-SparsePRT* SparsePRT::_head_expanded_list = NULL;
+SparsePRT* volatile SparsePRT::_head_expanded_list = NULL;
 
 void SparsePRT::add_to_expanded_list(SparsePRT* sprt) {
   // We could expand multiple times in a pause -- only put on list once.
diff --git a/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.hpp b/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.hpp
index 5cc884621..17bd4a145 100644
--- a/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.hpp
+++ b/hotspot/src/share/vm/gc_implementation/g1/sparsePRT.hpp
@@ -236,7 +236,7 @@ class SparsePRT VALUE_OBJ_CLASS_SPEC {
 
   bool should_be_on_expanded_list();
 
-  static SparsePRT* _head_expanded_list;
+  static SparsePRT*volatile _head_expanded_list;
 
 public:
   SparsePRT(HeapRegion* hr);
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
index 5173ff94e..bf3a207cd 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
@@ -177,7 +177,7 @@ class ParallelScavengeHeap : public CollectedHeap {
 
   bool supports_inline_contig_alloc() const { return !UseNUMA; }
 
-  HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; }
+  HeapWord*volatile* top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; }
   HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; }
 
   void ensure_parsability(bool retire_tlabs);
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp
index e3da6bdf2..9bb7eb8e6 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.hpp
@@ -162,7 +162,7 @@ class PSYoungGen : public CHeapObj<mtGC> {
     return result;
   }
 
-  HeapWord** top_addr() const   { return eden_space()->top_addr(); }
+  HeapWord*volatile* top_addr() const   { return eden_space()->top_addr(); }
   HeapWord** end_addr() const   { return eden_space()->end_addr(); }
 
   // Iteration.
diff --git a/hotspot/src/share/vm/gc_implementation/parallelScavenge/vmStructs_parallelgc.hpp b/hotspot/src/share/vm/gc_implementation/parallelScavenge/vmStructs_parallelgc.hpp
index 3c1a20284..051bcbd80 100644
--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/vmStructs_parallelgc.hpp
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/vmStructs_parallelgc.hpp
@@ -26,6 +26,7 @@
 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_VMSTRUCTS_PARALLELGC_HPP
 
 #define VM_STRUCTS_PARALLELGC(nonstatic_field, \
+                   volatile_nonstatic_field, \
                    static_field) \
                                                                                                                                      \
   /**********************/                                                                                                           \
@@ -40,7 +41,7 @@
   nonstatic_field(ImmutableSpace,              _bottom,                                       HeapWord*)                             \
   nonstatic_field(ImmutableSpace,              _end,                                          HeapWord*)                             \
                                                                                                                                      \
-  nonstatic_field(MutableSpace,                _top,                                          HeapWord*)                             \
+  volatile_nonstatic_field(MutableSpace,       _top,                                          HeapWord*)                             \
                                                                                                                                      \
   nonstatic_field(PSYoungGen,                  _reserved,                                     MemRegion)                             \
   nonstatic_field(PSYoungGen,                  _virtual_space,                                PSVirtualSpace*)                       \
diff --git a/hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp b/hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp
index 0f1dd075d..dbd52f24b 100644
--- a/hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp
+++ b/hotspot/src/share/vm/gc_implementation/shared/mutableSpace.hpp
@@ -51,7 +51,7 @@ class MutableSpace: public ImmutableSpace {
   MemRegion _last_setup_region;
   size_t _alignment;
  protected:
-  HeapWord* _top;
+  HeapWord *volatile _top;
 
   MutableSpaceMangler* mangler() { return _mangler; }
 
@@ -69,7 +69,7 @@ class MutableSpace: public ImmutableSpace {
   HeapWord* top() const                    { return _top;    }
   virtual void set_top(HeapWord* value)    { _top = value;   }
 
-  HeapWord** top_addr()                    { return &_top; }
+  HeapWord*volatile* top_addr()            { return &_top; }
   HeapWord** end_addr()                    { return &_end; }
 
   virtual void set_bottom(HeapWord* value) { _bottom = value; }
diff --git a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
index c13d29780..88632ddc8 100644
--- a/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
+++ b/hotspot/src/share/vm/gc_interface/collectedHeap.hpp
@@ -371,7 +371,7 @@ class CollectedHeap : public CHeapObj<mtInternal> {
   // These functions return the addresses of the fields that define the
   // boundaries of the contiguous allocation area.  (These fields should be
   // physically near to one another.)
-  virtual HeapWord** top_addr() const {
+  virtual HeapWord*volatile* top_addr() const {
     guarantee(false, "inline contiguous allocation not supported");
     return NULL;
   }
diff --git a/hotspot/src/share/vm/memory/defNewGeneration.cpp b/hotspot/src/share/vm/memory/defNewGeneration.cpp
index a9e1befed..e5ac4f847 100644
--- a/hotspot/src/share/vm/memory/defNewGeneration.cpp
+++ b/hotspot/src/share/vm/memory/defNewGeneration.cpp
@@ -494,7 +494,7 @@ size_t DefNewGeneration::contiguous_available() const {
 }
 
 
-HeapWord** DefNewGeneration::top_addr() const { return eden()->top_addr(); }
+HeapWord*volatile* DefNewGeneration::top_addr() const { return eden()->top_addr(); }
 HeapWord** DefNewGeneration::end_addr() const { return eden()->end_addr(); }
 
 void DefNewGeneration::object_iterate(ObjectClosure* blk) {
diff --git a/hotspot/src/share/vm/memory/defNewGeneration.hpp b/hotspot/src/share/vm/memory/defNewGeneration.hpp
index 28738619f..24d1b4c0f 100644
--- a/hotspot/src/share/vm/memory/defNewGeneration.hpp
+++ b/hotspot/src/share/vm/memory/defNewGeneration.hpp
@@ -233,7 +233,7 @@ protected:
   size_t max_survivor_size() const          { return _max_survivor_size; }
 
   bool supports_inline_contig_alloc() const { return true; }
-  HeapWord** top_addr() const;
+  HeapWord*volatile* top_addr() const;
   HeapWord** end_addr() const;
 
   // Thread-local allocation buffers
diff --git a/hotspot/src/share/vm/memory/genCollectedHeap.cpp b/hotspot/src/share/vm/memory/genCollectedHeap.cpp
index 7f4fc0d61..bbe6370a6 100644
--- a/hotspot/src/share/vm/memory/genCollectedHeap.cpp
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.cpp
@@ -782,7 +782,7 @@ bool GenCollectedHeap::supports_inline_contig_alloc() const {
   return _gens[0]->supports_inline_contig_alloc();
 }
 
-HeapWord** GenCollectedHeap::top_addr() const {
+HeapWord*volatile* GenCollectedHeap::top_addr() const {
   return _gens[0]->top_addr();
 }
 
diff --git a/hotspot/src/share/vm/memory/genCollectedHeap.hpp b/hotspot/src/share/vm/memory/genCollectedHeap.hpp
index 416ae8741..6d0dd591c 100644
--- a/hotspot/src/share/vm/memory/genCollectedHeap.hpp
+++ b/hotspot/src/share/vm/memory/genCollectedHeap.hpp
@@ -162,7 +162,7 @@ public:
   // We may support a shared contiguous allocation area, if the youngest
   // generation does.
   bool supports_inline_contig_alloc() const;
-  HeapWord** top_addr() const;
+  HeapWord*volatile* top_addr() const;
   HeapWord** end_addr() const;
 
   // Does this heap support heap inspection? (+PrintClassHistogram)
diff --git a/hotspot/src/share/vm/memory/generation.hpp b/hotspot/src/share/vm/memory/generation.hpp
index ca3fe949d..ef5457890 100644
--- a/hotspot/src/share/vm/memory/generation.hpp
+++ b/hotspot/src/share/vm/memory/generation.hpp
@@ -291,7 +291,7 @@ class Generation: public CHeapObj<mtGC> {
   // These functions return the addresses of the fields that define the
   // boundaries of the contiguous allocation area.  (These fields should be
   // physicall near to one another.)
-  virtual HeapWord** top_addr() const { return NULL; }
+  virtual HeapWord*volatile* top_addr() const { return NULL; }
   virtual HeapWord** end_addr() const { return NULL; }
 
   // Thread-local allocation buffers
diff --git a/hotspot/src/share/vm/runtime/vmStructs.cpp b/hotspot/src/share/vm/runtime/vmStructs.cpp
index 60eb2682a..428e07c75 100644
--- a/hotspot/src/share/vm/runtime/vmStructs.cpp
+++ b/hotspot/src/share/vm/runtime/vmStructs.cpp
@@ -2918,6 +2918,7 @@ VMStructEntry VMStructs::localHotSpotVMStructs[] = {
 
 #if INCLUDE_ALL_GCS
   VM_STRUCTS_PARALLELGC(GENERATE_NONSTATIC_VM_STRUCT_ENTRY,
+                        GENERATE_NONSTATIC_VM_STRUCT_ENTRY,
                         GENERATE_STATIC_VM_STRUCT_ENTRY)
 
   VM_STRUCTS_CMS(GENERATE_NONSTATIC_VM_STRUCT_ENTRY,
@@ -3075,6 +3076,7 @@ VMStructs::init() {
 
 #if INCLUDE_ALL_GCS
   VM_STRUCTS_PARALLELGC(CHECK_NONSTATIC_VM_STRUCT_ENTRY,
+             CHECK_VOLATILE_NONSTATIC_VM_STRUCT_ENTRY,
              CHECK_STATIC_VM_STRUCT_ENTRY);
 
   VM_STRUCTS_CMS(CHECK_NONSTATIC_VM_STRUCT_ENTRY,
@@ -3191,6 +3193,7 @@ VMStructs::init() {
                         CHECK_NO_OP));
 #if INCLUDE_ALL_GCS
   debug_only(VM_STRUCTS_PARALLELGC(ENSURE_FIELD_TYPE_PRESENT,
+                                   ENSURE_FIELD_TYPE_PRESENT,
                                    ENSURE_FIELD_TYPE_PRESENT));
   debug_only(VM_STRUCTS_CMS(ENSURE_FIELD_TYPE_PRESENT,
                             ENSURE_FIELD_TYPE_PRESENT,
-- 
2.19.0