diff options
Diffstat (limited to 'src/3rdparty/v8/src/x64/codegen-x64.cc')
-rw-r--r-- | src/3rdparty/v8/src/x64/codegen-x64.cc | 91 |
1 files changed, 88 insertions, 3 deletions
diff --git a/src/3rdparty/v8/src/x64/codegen-x64.cc b/src/3rdparty/v8/src/x64/codegen-x64.cc index a8d39b2..ffccf47 100644 --- a/src/3rdparty/v8/src/x64/codegen-x64.cc +++ b/src/3rdparty/v8/src/x64/codegen-x64.cc @@ -220,7 +220,7 @@ ModuloFunction CreateModuloFunction() { #define __ ACCESS_MASM(masm) -void ElementsTransitionGenerator::GenerateSmiOnlyToObject( +void ElementsTransitionGenerator::GenerateMapChangeElementsTransition( MacroAssembler* masm) { // ----------- S t a t e ------------- // -- rax : value @@ -241,7 +241,7 @@ void ElementsTransitionGenerator::GenerateSmiOnlyToObject( } -void ElementsTransitionGenerator::GenerateSmiOnlyToDouble( +void ElementsTransitionGenerator::GenerateSmiToDouble( MacroAssembler* masm, Label* fail) { // ----------- S t a t e ------------- // -- rax : value @@ -551,7 +551,7 @@ void StringCharLoadGenerator::Generate(MacroAssembler* masm, // Dispatch on the encoding: ASCII or two-byte. Label ascii; __ bind(&seq_string); - STATIC_ASSERT((kStringEncodingMask & kAsciiStringTag) != 0); + STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); __ testb(result, Immediate(kStringEncodingMask)); __ j(not_zero, &ascii, Label::kNear); @@ -577,6 +577,91 @@ void StringCharLoadGenerator::Generate(MacroAssembler* masm, #undef __ + +static const int kNoCodeAgeSequenceLength = 6; + +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(rbp); + patcher.masm()->movq(rbp, rsp); + patcher.masm()->push(rsi); + patcher.masm()->push(rdi); + initialized = true; + } + return sequence; +} + + +byte* Code::FindPlatformCodeAgeSequence() { + byte* start = instruction_start(); + uint32_t young_length; + byte* young_sequence = GetNoCodeAgeSequence(&young_length); + if (!memcmp(start, young_sequence, young_length) || + *start == kCallOpcode) { + return start; + } else { + byte* start_after_strict = NULL; + if (kind() == FUNCTION) { + start_after_strict = start + kSizeOfFullCodegenStrictModePrologue; + } else { + ASSERT(kind() == OPTIMIZED_FUNCTION); + start_after_strict = start + kSizeOfOptimizedStrictModePrologue; + } + ASSERT(!memcmp(start_after_strict, young_sequence, young_length) || + *start_after_strict == kCallOpcode); + return start_after_strict; + } +} + + +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); + return result; +} + + +void Code::GetCodeAgeAndParity(byte* sequence, Age* age, + MarkingParity* parity) { + if (IsYoungSequence(sequence)) { + *age = kNoAge; + *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(byte* sequence, + Code::Age age, + MarkingParity parity) { + uint32_t young_length; + byte* young_sequence = GetNoCodeAgeSequence(&young_length); + if (age == kNoAge) { + memcpy(sequence, young_sequence, young_length); + CPU::FlushICache(sequence, young_length); + } else { + Code* stub = GetCodeAgeStub(age, parity); + CodePatcher patcher(sequence, young_length); + patcher.masm()->call(stub->instruction_start()); + patcher.masm()->nop(); + } +} + + } } // namespace v8::internal #endif // V8_TARGET_ARCH_X64 |