| // Copyright 2011 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. |
| |
| #ifndef V8_X87_CODE_STUBS_X87_H_ |
| #define V8_X87_CODE_STUBS_X87_H_ |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| void ArrayNativeCode(MacroAssembler* masm, |
| bool construct_call, |
| Label* call_generic_code); |
| |
| |
| class StringHelper : public AllStatic { |
| public: |
| // Generate code for copying characters using the rep movs instruction. |
| // Copies ecx characters from esi to edi. Copying of overlapping regions is |
| // not supported. |
| static void GenerateCopyCharacters(MacroAssembler* masm, |
| Register dest, |
| Register src, |
| Register count, |
| Register scratch, |
| String::Encoding encoding); |
| |
| // Compares two flat one byte strings and returns result in eax. |
| static void GenerateCompareFlatOneByteStrings(MacroAssembler* masm, |
| Register left, Register right, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3); |
| |
| // Compares two flat one byte strings for equality and returns result in eax. |
| static void GenerateFlatOneByteStringEquals(MacroAssembler* masm, |
| Register left, Register right, |
| Register scratch1, |
| Register scratch2); |
| |
| private: |
| static void GenerateOneByteCharsCompareLoop( |
| MacroAssembler* masm, Register left, Register right, Register length, |
| Register scratch, Label* chars_not_equal, |
| Label::Distance chars_not_equal_near = Label::kFar); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper); |
| }; |
| |
| |
| class NameDictionaryLookupStub: public PlatformCodeStub { |
| public: |
| enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP }; |
| |
| NameDictionaryLookupStub(Isolate* isolate, Register dictionary, |
| Register result, Register index, LookupMode mode) |
| : PlatformCodeStub(isolate) { |
| minor_key_ = DictionaryBits::encode(dictionary.code()) | |
| ResultBits::encode(result.code()) | |
| IndexBits::encode(index.code()) | LookupModeBits::encode(mode); |
| } |
| |
| static void GenerateNegativeLookup(MacroAssembler* masm, |
| Label* miss, |
| Label* done, |
| Register properties, |
| Handle<Name> name, |
| Register r0); |
| |
| static void GeneratePositiveLookup(MacroAssembler* masm, |
| Label* miss, |
| Label* done, |
| Register elements, |
| Register name, |
| Register r0, |
| Register r1); |
| |
| virtual bool SometimesSetsUpAFrame() { return false; } |
| |
| private: |
| static const int kInlinedProbes = 4; |
| static const int kTotalProbes = 20; |
| |
| static const int kCapacityOffset = |
| NameDictionary::kHeaderSize + |
| NameDictionary::kCapacityIndex * kPointerSize; |
| |
| static const int kElementsStartOffset = |
| NameDictionary::kHeaderSize + |
| NameDictionary::kElementsStartIndex * kPointerSize; |
| |
| Register dictionary() const { |
| return Register::from_code(DictionaryBits::decode(minor_key_)); |
| } |
| |
| Register result() const { |
| return Register::from_code(ResultBits::decode(minor_key_)); |
| } |
| |
| Register index() const { |
| return Register::from_code(IndexBits::decode(minor_key_)); |
| } |
| |
| LookupMode mode() const { return LookupModeBits::decode(minor_key_); } |
| |
| class DictionaryBits: public BitField<int, 0, 3> {}; |
| class ResultBits: public BitField<int, 3, 3> {}; |
| class IndexBits: public BitField<int, 6, 3> {}; |
| class LookupModeBits: public BitField<LookupMode, 9, 1> {}; |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| DEFINE_PLATFORM_CODE_STUB(NameDictionaryLookup, PlatformCodeStub); |
| }; |
| |
| |
| class RecordWriteStub: public PlatformCodeStub { |
| public: |
| RecordWriteStub(Isolate* isolate, Register object, Register value, |
| Register address, RememberedSetAction remembered_set_action, |
| SaveFPRegsMode fp_mode) |
| : PlatformCodeStub(isolate), |
| regs_(object, // An input reg. |
| address, // An input reg. |
| value) { // One scratch reg. |
| minor_key_ = ObjectBits::encode(object.code()) | |
| ValueBits::encode(value.code()) | |
| AddressBits::encode(address.code()) | |
| RememberedSetActionBits::encode(remembered_set_action) | |
| SaveFPRegsModeBits::encode(fp_mode); |
| } |
| |
| RecordWriteStub(uint32_t key, Isolate* isolate) |
| : PlatformCodeStub(key, isolate), regs_(object(), address(), value()) {} |
| |
| enum Mode { |
| STORE_BUFFER_ONLY, |
| INCREMENTAL, |
| INCREMENTAL_COMPACTION |
| }; |
| |
| virtual bool SometimesSetsUpAFrame() { return false; } |
| |
| static const byte kTwoByteNopInstruction = 0x3c; // Cmpb al, #imm8. |
| static const byte kTwoByteJumpInstruction = 0xeb; // Jmp #imm8. |
| |
| static const byte kFiveByteNopInstruction = 0x3d; // Cmpl eax, #imm32. |
| static const byte kFiveByteJumpInstruction = 0xe9; // Jmp #imm32. |
| |
| static Mode GetMode(Code* stub) { |
| byte first_instruction = stub->instruction_start()[0]; |
| byte second_instruction = stub->instruction_start()[2]; |
| |
| if (first_instruction == kTwoByteJumpInstruction) { |
| return INCREMENTAL; |
| } |
| |
| DCHECK(first_instruction == kTwoByteNopInstruction); |
| |
| if (second_instruction == kFiveByteJumpInstruction) { |
| return INCREMENTAL_COMPACTION; |
| } |
| |
| DCHECK(second_instruction == kFiveByteNopInstruction); |
| |
| return STORE_BUFFER_ONLY; |
| } |
| |
| static void Patch(Code* stub, Mode mode) { |
| switch (mode) { |
| case STORE_BUFFER_ONLY: |
| DCHECK(GetMode(stub) == INCREMENTAL || |
| GetMode(stub) == INCREMENTAL_COMPACTION); |
| stub->instruction_start()[0] = kTwoByteNopInstruction; |
| stub->instruction_start()[2] = kFiveByteNopInstruction; |
| break; |
| case INCREMENTAL: |
| DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| stub->instruction_start()[0] = kTwoByteJumpInstruction; |
| break; |
| case INCREMENTAL_COMPACTION: |
| DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| stub->instruction_start()[0] = kTwoByteNopInstruction; |
| stub->instruction_start()[2] = kFiveByteJumpInstruction; |
| break; |
| } |
| DCHECK(GetMode(stub) == mode); |
| CpuFeatures::FlushICache(stub->instruction_start(), 7); |
| } |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| |
| private: |
| // This is a helper class for freeing up 3 scratch registers, where the third |
| // is always ecx (needed for shift operations). The input is two registers |
| // that must be preserved and one scratch register provided by the caller. |
| class RegisterAllocation { |
| public: |
| RegisterAllocation(Register object, |
| Register address, |
| Register scratch0) |
| : object_orig_(object), |
| address_orig_(address), |
| scratch0_orig_(scratch0), |
| object_(object), |
| address_(address), |
| scratch0_(scratch0) { |
| DCHECK(!AreAliased(scratch0, object, address, no_reg)); |
| scratch1_ = GetRegThatIsNotEcxOr(object_, address_, scratch0_); |
| if (scratch0.is(ecx)) { |
| scratch0_ = GetRegThatIsNotEcxOr(object_, address_, scratch1_); |
| } |
| if (object.is(ecx)) { |
| object_ = GetRegThatIsNotEcxOr(address_, scratch0_, scratch1_); |
| } |
| if (address.is(ecx)) { |
| address_ = GetRegThatIsNotEcxOr(object_, scratch0_, scratch1_); |
| } |
| DCHECK(!AreAliased(scratch0_, object_, address_, ecx)); |
| } |
| |
| void Save(MacroAssembler* masm) { |
| DCHECK(!address_orig_.is(object_)); |
| DCHECK(object_.is(object_orig_) || address_.is(address_orig_)); |
| DCHECK(!AreAliased(object_, address_, scratch1_, scratch0_)); |
| DCHECK(!AreAliased(object_orig_, address_, scratch1_, scratch0_)); |
| DCHECK(!AreAliased(object_, address_orig_, scratch1_, scratch0_)); |
| // We don't have to save scratch0_orig_ because it was given to us as |
| // a scratch register. But if we had to switch to a different reg then |
| // we should save the new scratch0_. |
| if (!scratch0_.is(scratch0_orig_)) masm->push(scratch0_); |
| if (!ecx.is(scratch0_orig_) && |
| !ecx.is(object_orig_) && |
| !ecx.is(address_orig_)) { |
| masm->push(ecx); |
| } |
| masm->push(scratch1_); |
| if (!address_.is(address_orig_)) { |
| masm->push(address_); |
| masm->mov(address_, address_orig_); |
| } |
| if (!object_.is(object_orig_)) { |
| masm->push(object_); |
| masm->mov(object_, object_orig_); |
| } |
| } |
| |
| void Restore(MacroAssembler* masm) { |
| // These will have been preserved the entire time, so we just need to move |
| // them back. Only in one case is the orig_ reg different from the plain |
| // one, since only one of them can alias with ecx. |
| if (!object_.is(object_orig_)) { |
| masm->mov(object_orig_, object_); |
| masm->pop(object_); |
| } |
| if (!address_.is(address_orig_)) { |
| masm->mov(address_orig_, address_); |
| masm->pop(address_); |
| } |
| masm->pop(scratch1_); |
| if (!ecx.is(scratch0_orig_) && |
| !ecx.is(object_orig_) && |
| !ecx.is(address_orig_)) { |
| masm->pop(ecx); |
| } |
| if (!scratch0_.is(scratch0_orig_)) masm->pop(scratch0_); |
| } |
| |
| // If we have to call into C then we need to save and restore all caller- |
| // saved registers that were not already preserved. The caller saved |
| // registers are eax, ecx and edx. The three scratch registers (incl. ecx) |
| // will be restored by other means so we don't bother pushing them here. |
| void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) { |
| if (!scratch0_.is(eax) && !scratch1_.is(eax)) masm->push(eax); |
| if (!scratch0_.is(edx) && !scratch1_.is(edx)) masm->push(edx); |
| if (mode == kSaveFPRegs) { |
| // Save FPU state in m108byte. |
| masm->sub(esp, Immediate(108)); |
| masm->fnsave(Operand(esp, 0)); |
| } |
| } |
| |
| inline void RestoreCallerSaveRegisters(MacroAssembler* masm, |
| SaveFPRegsMode mode) { |
| if (mode == kSaveFPRegs) { |
| // Restore FPU state in m108byte. |
| masm->frstor(Operand(esp, 0)); |
| masm->add(esp, Immediate(108)); |
| } |
| if (!scratch0_.is(edx) && !scratch1_.is(edx)) masm->pop(edx); |
| if (!scratch0_.is(eax) && !scratch1_.is(eax)) masm->pop(eax); |
| } |
| |
| inline Register object() { return object_; } |
| inline Register address() { return address_; } |
| inline Register scratch0() { return scratch0_; } |
| inline Register scratch1() { return scratch1_; } |
| |
| private: |
| Register object_orig_; |
| Register address_orig_; |
| Register scratch0_orig_; |
| Register object_; |
| Register address_; |
| Register scratch0_; |
| Register scratch1_; |
| // Third scratch register is always ecx. |
| |
| Register GetRegThatIsNotEcxOr(Register r1, |
| Register r2, |
| Register r3) { |
| for (int i = 0; i < Register::NumAllocatableRegisters(); i++) { |
| Register candidate = Register::FromAllocationIndex(i); |
| if (candidate.is(ecx)) continue; |
| if (candidate.is(r1)) continue; |
| if (candidate.is(r2)) continue; |
| if (candidate.is(r3)) continue; |
| return candidate; |
| } |
| UNREACHABLE(); |
| return no_reg; |
| } |
| friend class RecordWriteStub; |
| }; |
| |
| enum OnNoNeedToInformIncrementalMarker { |
| kReturnOnNoNeedToInformIncrementalMarker, |
| kUpdateRememberedSetOnNoNeedToInformIncrementalMarker |
| }; |
| |
| virtual inline Major MajorKey() const FINAL OVERRIDE { return RecordWrite; } |
| |
| virtual void Generate(MacroAssembler* masm) OVERRIDE; |
| void GenerateIncremental(MacroAssembler* masm, Mode mode); |
| void CheckNeedsToInformIncrementalMarker( |
| MacroAssembler* masm, |
| OnNoNeedToInformIncrementalMarker on_no_need, |
| Mode mode); |
| void InformIncrementalMarker(MacroAssembler* masm); |
| |
| void Activate(Code* code) { |
| code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code); |
| } |
| |
| Register object() const { |
| return Register::from_code(ObjectBits::decode(minor_key_)); |
| } |
| |
| Register value() const { |
| return Register::from_code(ValueBits::decode(minor_key_)); |
| } |
| |
| Register address() const { |
| return Register::from_code(AddressBits::decode(minor_key_)); |
| } |
| |
| RememberedSetAction remembered_set_action() const { |
| return RememberedSetActionBits::decode(minor_key_); |
| } |
| |
| SaveFPRegsMode save_fp_regs_mode() const { |
| return SaveFPRegsModeBits::decode(minor_key_); |
| } |
| |
| class ObjectBits: public BitField<int, 0, 3> {}; |
| class ValueBits: public BitField<int, 3, 3> {}; |
| class AddressBits: public BitField<int, 6, 3> {}; |
| class RememberedSetActionBits: public BitField<RememberedSetAction, 9, 1> {}; |
| class SaveFPRegsModeBits : public BitField<SaveFPRegsMode, 10, 1> {}; |
| |
| RegisterAllocation regs_; |
| |
| DISALLOW_COPY_AND_ASSIGN(RecordWriteStub); |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_X87_CODE_STUBS_X87_H_ |