| // Copyright 2014 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_PPC_CODE_STUBS_PPC_H_ |
| #define V8_PPC_CODE_STUBS_PPC_H_ |
| |
| #include "src/ppc/frames-ppc.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code); |
| |
| |
| class StringHelper : public AllStatic { |
| public: |
| // Compares two flat one-byte strings and returns result in r0. |
| 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 r0. |
| 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 scratch1, |
| Label* chars_not_equal); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper); |
| }; |
| |
| |
| class StoreRegistersStateStub : public PlatformCodeStub { |
| public: |
| explicit StoreRegistersStateStub(Isolate* isolate) |
| : PlatformCodeStub(isolate) {} |
| |
| static void GenerateAheadOfTime(Isolate* isolate); |
| |
| private: |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| DEFINE_PLATFORM_CODE_STUB(StoreRegistersState, PlatformCodeStub); |
| }; |
| |
| |
| class RestoreRegistersStateStub : public PlatformCodeStub { |
| public: |
| explicit RestoreRegistersStateStub(Isolate* isolate) |
| : PlatformCodeStub(isolate) {} |
| |
| static void GenerateAheadOfTime(Isolate* isolate); |
| |
| private: |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| DEFINE_PLATFORM_CODE_STUB(RestoreRegistersState, 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 }; |
| |
| bool SometimesSetsUpAFrame() override { return false; } |
| |
| static void PatchBranchIntoNop(MacroAssembler* masm, int pos) { |
| // Consider adding DCHECK here to catch bad patching |
| masm->instr_at_put(pos, (masm->instr_at(pos) & ~kBOfieldMask) | BT); |
| } |
| |
| static void PatchNopIntoBranch(MacroAssembler* masm, int pos) { |
| // Consider adding DCHECK here to catch bad patching |
| masm->instr_at_put(pos, (masm->instr_at(pos) & ~kBOfieldMask) | BF); |
| } |
| |
| static Mode GetMode(Code* stub) { |
| Instr first_instruction = |
| Assembler::instr_at(stub->instruction_start() + Assembler::kInstrSize); |
| Instr second_instruction = Assembler::instr_at(stub->instruction_start() + |
| (Assembler::kInstrSize * 2)); |
| |
| // Consider adding DCHECK here to catch unexpected instruction sequence |
| if (BF == (first_instruction & kBOfieldMask)) { |
| return INCREMENTAL; |
| } |
| |
| if (BF == (second_instruction & kBOfieldMask)) { |
| return INCREMENTAL_COMPACTION; |
| } |
| |
| return STORE_BUFFER_ONLY; |
| } |
| |
| static void Patch(Code* stub, Mode mode) { |
| MacroAssembler masm(stub->GetIsolate(), stub->instruction_start(), |
| stub->instruction_size(), CodeObjectRequired::kNo); |
| switch (mode) { |
| case STORE_BUFFER_ONLY: |
| DCHECK(GetMode(stub) == INCREMENTAL || |
| GetMode(stub) == INCREMENTAL_COMPACTION); |
| |
| PatchBranchIntoNop(&masm, Assembler::kInstrSize); |
| PatchBranchIntoNop(&masm, Assembler::kInstrSize * 2); |
| break; |
| case INCREMENTAL: |
| DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| PatchNopIntoBranch(&masm, Assembler::kInstrSize); |
| break; |
| case INCREMENTAL_COMPACTION: |
| DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| PatchNopIntoBranch(&masm, Assembler::kInstrSize * 2); |
| break; |
| } |
| DCHECK(GetMode(stub) == mode); |
| Assembler::FlushICache(stub->GetIsolate(), |
| stub->instruction_start() + Assembler::kInstrSize, |
| 2 * Assembler::kInstrSize); |
| } |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| |
| private: |
| // This is a helper class for freeing up 3 scratch registers. 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_(object), address_(address), scratch0_(scratch0) { |
| DCHECK(!AreAliased(scratch0, object, address, no_reg)); |
| scratch1_ = GetRegisterThatIsNotOneOf(object_, address_, scratch0_); |
| } |
| |
| void Save(MacroAssembler* masm) { |
| DCHECK(!AreAliased(object_, address_, scratch1_, scratch0_)); |
| // We don't have to save scratch0_ because it was given to us as |
| // a scratch register. |
| masm->push(scratch1_); |
| } |
| |
| void Restore(MacroAssembler* masm) { masm->pop(scratch1_); } |
| |
| // If we have to call into C then we need to save and restore all caller- |
| // saved registers that were not already preserved. The scratch registers |
| // will be restored by other means so we don't bother pushing them here. |
| void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) { |
| masm->mflr(r0); |
| masm->push(r0); |
| masm->MultiPush(kJSCallerSaved & ~scratch1_.bit()); |
| if (mode == kSaveFPRegs) { |
| // Save all volatile FP registers except d0. |
| masm->MultiPushDoubles(kCallerSavedDoubles & ~d0.bit()); |
| } |
| } |
| |
| inline void RestoreCallerSaveRegisters(MacroAssembler* masm, |
| SaveFPRegsMode mode) { |
| if (mode == kSaveFPRegs) { |
| // Restore all volatile FP registers except d0. |
| masm->MultiPopDoubles(kCallerSavedDoubles & ~d0.bit()); |
| } |
| masm->MultiPop(kJSCallerSaved & ~scratch1_.bit()); |
| masm->pop(r0); |
| masm->mtlr(r0); |
| } |
| |
| inline Register object() { return object_; } |
| inline Register address() { return address_; } |
| inline Register scratch0() { return scratch0_; } |
| inline Register scratch1() { return scratch1_; } |
| |
| private: |
| Register object_; |
| Register address_; |
| Register scratch0_; |
| Register scratch1_; |
| |
| friend class RecordWriteStub; |
| }; |
| |
| enum OnNoNeedToInformIncrementalMarker { |
| kReturnOnNoNeedToInformIncrementalMarker, |
| kUpdateRememberedSetOnNoNeedToInformIncrementalMarker |
| }; |
| |
| inline Major MajorKey() const final { return RecordWrite; } |
| |
| 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) override { |
| 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, 5> {}; |
| class ValueBits : public BitField<int, 5, 5> {}; |
| class AddressBits : public BitField<int, 10, 5> {}; |
| class RememberedSetActionBits : public BitField<RememberedSetAction, 15, 1> { |
| }; |
| class SaveFPRegsModeBits : public BitField<SaveFPRegsMode, 16, 1> {}; |
| |
| Label slow_; |
| RegisterAllocation regs_; |
| |
| DISALLOW_COPY_AND_ASSIGN(RecordWriteStub); |
| }; |
| |
| |
| // Trampoline stub to call into native code. To call safely into native code |
| // in the presence of compacting GC (which can move code objects) we need to |
| // keep the code which called into native pinned in the memory. Currently the |
| // simplest approach is to generate such stub early enough so it can never be |
| // moved by GC |
| class DirectCEntryStub : public PlatformCodeStub { |
| public: |
| explicit DirectCEntryStub(Isolate* isolate) : PlatformCodeStub(isolate) {} |
| void GenerateCall(MacroAssembler* masm, Register target); |
| |
| private: |
| bool NeedsImmovableCode() override { return true; } |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| DEFINE_PLATFORM_CODE_STUB(DirectCEntry, PlatformCodeStub); |
| }; |
| |
| |
| class NameDictionaryLookupStub : public PlatformCodeStub { |
| public: |
| enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP }; |
| |
| NameDictionaryLookupStub(Isolate* isolate, LookupMode mode) |
| : PlatformCodeStub(isolate) { |
| minor_key_ = LookupModeBits::encode(mode); |
| } |
| |
| static void GenerateNegativeLookup(MacroAssembler* masm, Label* miss, |
| Label* done, Register receiver, |
| Register properties, Handle<Name> name, |
| Register scratch0); |
| |
| bool SometimesSetsUpAFrame() override { 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; |
| |
| LookupMode mode() const { return LookupModeBits::decode(minor_key_); } |
| |
| class LookupModeBits : public BitField<LookupMode, 0, 1> {}; |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| DEFINE_PLATFORM_CODE_STUB(NameDictionaryLookup, PlatformCodeStub); |
| }; |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_PPC_CODE_STUBS_PPC_H_ |