Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/ia32/codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "codegen.h"
 #include "heap.h"
@@ skipping 1032 matching lines @@
   __ movsd(double_scratch, Operand::StaticArray(
       temp2, times_8, ExternalReference::math_exp_log_table()));
   __ orps(input, double_scratch);
   __ mulsd(result, input);
   __ bind(&done);
 }
 
 #undef __
 
 
-static byte* GetNoCodeAgeSequence(uint32_t* length) {
-  static bool initialized = false;
-  static byte sequence[kNoCodeAgeSequenceLength];
-  *length = kNoCodeAgeSequenceLength;
-  if (!initialized) {
-    // The sequence of instructions that is patched out for aging code is the
-    // following boilerplate stack-building prologue that is found both in
-    // FUNCTION and OPTIMIZED_FUNCTION code:
-    CodePatcher patcher(sequence, kNoCodeAgeSequenceLength);
-    patcher.masm()->push(ebp);
-    patcher.masm()->mov(ebp, esp);
-    patcher.masm()->push(esi);
-    patcher.masm()->push(edi);
-    initialized = true;
-  }
-  return sequence;
+CodeAgingHelper::CodeAgingHelper() {
+  ASSERT(young_sequence_.length() == kNoCodeAgeSequenceLength);
+  CodePatcher patcher(young_sequence_.start(), young_sequence_.length());
+  patcher.masm()->push(ebp);
+  patcher.masm()->mov(ebp, esp);
+  patcher.masm()->push(esi);
+  patcher.masm()->push(edi);
 }
 
 
-bool Code::IsYoungSequence(byte* sequence) {
-  uint32_t young_length;
-  byte* young_sequence = GetNoCodeAgeSequence(&young_length);
-  bool result = (!memcmp(sequence, young_sequence, young_length));
-  ASSERT(result || *sequence == kCallOpcode);
+#ifdef DEBUG
+bool CodeAgingHelper::IsOld(byte* candidate) const {
+  return *candidate == kCallOpcode;
+}
+#endif
+
+
+bool Code::IsYoungSequence(Isolate* isolate, byte* sequence) {
+  bool result = isolate->code_aging_helper()->IsYoung(sequence);
+  ASSERT(result || isolate->code_aging_helper()->IsOld(sequence));
   return result;
 }
 
 
-void Code::GetCodeAgeAndParity(byte* sequence, Age* age,
+void Code::GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age,
                                MarkingParity* parity) {
-  if (IsYoungSequence(sequence)) {
+  if (IsYoungSequence(isolate, sequence)) {
     *age = kNoAgeCodeAge;
     *parity = NO_MARKING_PARITY;
   } else {
     sequence++;  // Skip the kCallOpcode byte
     Address target_address = sequence + *reinterpret_cast<int*>(sequence) +
         Assembler::kCallTargetAddressOffset;
     Code* stub = GetCodeFromTargetAddress(target_address);
     GetCodeAgeAndParity(stub, age, parity);
   }
 }
 
 
 void Code::PatchPlatformCodeAge(Isolate* isolate,
                                 byte* sequence,
                                 Code::Age age,
                                 MarkingParity parity) {
-  uint32_t young_length;
-  byte* young_sequence = GetNoCodeAgeSequence(&young_length);
+  uint32_t young_length = isolate->code_aging_helper()->young_sequence_length();
   if (age == kNoAgeCodeAge) {
-    CopyBytes(sequence, young_sequence, young_length);
+    isolate->code_aging_helper()->CopyYoungSequenceTo(sequence);
     CPU::FlushICache(sequence, young_length);
   } else {
     Code* stub = GetCodeAgeStub(isolate, age, parity);
     CodePatcher patcher(sequence, young_length);
     patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32