[Heap] Remove concept of MarkingParity.

src/arm64/codegen-arm64.cc

 // Copyright 2013 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 "src/arm64/codegen-arm64.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/arm64/simulator-arm64.h"
 #include "src/codegen.h"
@@ skipping 54 matching lines @@
 bool CodeAgingHelper::IsOld(byte* candidate) const {
   return memcmp(candidate, old_sequence_.start(), kCodeAgeStubEntryOffset) == 0;
 }
 #endif
 
 
 bool Code::IsYoungSequence(Isolate* isolate, byte* sequence) {
   return MacroAssembler::IsYoungSequence(isolate, sequence);
 }
 
-
-void Code::GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age,
-                               MarkingParity* parity) {
+Code::Age Code::GetCodeAge(Isolate* isolate, byte* sequence) {
   if (IsYoungSequence(isolate, sequence)) {
-    *age = kNoAgeCodeAge;
-    *parity = NO_MARKING_PARITY;
+    return kNoAgeCodeAge;
   } else {
     byte* target = sequence + kCodeAgeStubEntryOffset;
     Code* stub = GetCodeFromTargetAddress(Memory::Address_at(target));
-    GetCodeAgeAndParity(stub, age, parity);
+    return GetAgeOfCodeAgeStub(stub);
   }
 }
 
-
-void Code::PatchPlatformCodeAge(Isolate* isolate,
-                                byte* sequence,
-                                Code::Age age,
-                                MarkingParity parity) {
+void Code::PatchPlatformCodeAge(Isolate* isolate, byte* sequence,
+                                Code::Age age) {
   PatchingAssembler patcher(isolate, sequence,
                             kNoCodeAgeSequenceLength / kInstructionSize);
   if (age == kNoAgeCodeAge) {
     MacroAssembler::EmitFrameSetupForCodeAgePatching(&patcher);
   } else {
-    Code * stub = GetCodeAgeStub(isolate, age, parity);
+    Code* stub = GetCodeAgeStub(isolate, age);
     MacroAssembler::EmitCodeAgeSequence(&patcher, stub);
   }
 }
 
 
 void StringCharLoadGenerator::Generate(MacroAssembler* masm,
                                        Register string,
                                        Register index,
                                        Register result,
                                        Label* call_runtime) {
@@ skipping 74 matching lines @@
   __ Ldrb(result, MemOperand(string, index, SXTW));
   __ Bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64