| // 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. |
| |
| #ifndef V8_ARM_CODE_STUBS_ARM_H_ |
| #define V8_ARM_CODE_STUBS_ARM_H_ |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code); |
| |
| |
| class StringHelper : public AllStatic { |
| public: |
| // Generate code for copying a large number of characters. This function |
| // is allowed to spend extra time setting up conditions to make copying |
| // faster. Copying of overlapping regions is not supported. |
| // Dest register ends at the position after the last character written. |
| 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 r0. |
| static void GenerateCompareFlatOneByteStrings( |
| MacroAssembler* masm, Register left, Register right, Register scratch1, |
| Register scratch2, Register scratch3, Register scratch4); |
| |
| // 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, |
| Register scratch3); |
| |
| private: |
| static void GenerateOneByteCharsCompareLoop( |
| MacroAssembler* masm, Register left, Register right, Register length, |
| Register scratch1, Register scratch2, Label* chars_not_equal); |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper); |
| }; |
| |
| |
| // This stub can convert a signed int32 to a heap number (double). It does |
| // not work for int32s that are in Smi range! No GC occurs during this stub |
| // so you don't have to set up the frame. |
| class WriteInt32ToHeapNumberStub : public PlatformCodeStub { |
| public: |
| WriteInt32ToHeapNumberStub(Isolate* isolate, Register the_int, |
| Register the_heap_number, Register scratch) |
| : PlatformCodeStub(isolate) { |
| minor_key_ = IntRegisterBits::encode(the_int.code()) | |
| HeapNumberRegisterBits::encode(the_heap_number.code()) | |
| ScratchRegisterBits::encode(scratch.code()); |
| } |
| |
| static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate); |
| |
| private: |
| Register the_int() const { |
| return Register::from_code(IntRegisterBits::decode(minor_key_)); |
| } |
| |
| Register the_heap_number() const { |
| return Register::from_code(HeapNumberRegisterBits::decode(minor_key_)); |
| } |
| |
| Register scratch() const { |
| return Register::from_code(ScratchRegisterBits::decode(minor_key_)); |
| } |
| |
| // Minor key encoding in 16 bits. |
| class IntRegisterBits: public BitField<int, 0, 4> {}; |
| class HeapNumberRegisterBits: public BitField<int, 4, 4> {}; |
| class ScratchRegisterBits: public BitField<int, 8, 4> {}; |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| DEFINE_PLATFORM_CODE_STUB(WriteInt32ToHeapNumber, 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 void PatchBranchIntoNop(MacroAssembler* masm, int pos) { |
| masm->instr_at_put(pos, (masm->instr_at(pos) & ~B27) | (B24 | B20)); |
| DCHECK(Assembler::IsTstImmediate(masm->instr_at(pos))); |
| } |
| |
| static void PatchNopIntoBranch(MacroAssembler* masm, int pos) { |
| masm->instr_at_put(pos, (masm->instr_at(pos) & ~(B24 | B20)) | B27); |
| DCHECK(Assembler::IsBranch(masm->instr_at(pos))); |
| } |
| |
| static Mode GetMode(Code* stub) { |
| Instr first_instruction = Assembler::instr_at(stub->instruction_start()); |
| Instr second_instruction = Assembler::instr_at(stub->instruction_start() + |
| Assembler::kInstrSize); |
| |
| if (Assembler::IsBranch(first_instruction)) { |
| return INCREMENTAL; |
| } |
| |
| DCHECK(Assembler::IsTstImmediate(first_instruction)); |
| |
| if (Assembler::IsBranch(second_instruction)) { |
| return INCREMENTAL_COMPACTION; |
| } |
| |
| DCHECK(Assembler::IsTstImmediate(second_instruction)); |
| |
| return STORE_BUFFER_ONLY; |
| } |
| |
| static void Patch(Code* stub, Mode mode) { |
| MacroAssembler masm(NULL, |
| stub->instruction_start(), |
| stub->instruction_size()); |
| switch (mode) { |
| case STORE_BUFFER_ONLY: |
| DCHECK(GetMode(stub) == INCREMENTAL || |
| GetMode(stub) == INCREMENTAL_COMPACTION); |
| PatchBranchIntoNop(&masm, 0); |
| PatchBranchIntoNop(&masm, Assembler::kInstrSize); |
| break; |
| case INCREMENTAL: |
| DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| PatchNopIntoBranch(&masm, 0); |
| break; |
| case INCREMENTAL_COMPACTION: |
| DCHECK(GetMode(stub) == STORE_BUFFER_ONLY); |
| PatchNopIntoBranch(&masm, Assembler::kInstrSize); |
| break; |
| } |
| DCHECK(GetMode(stub) == mode); |
| CpuFeatures::FlushICache(stub->instruction_start(), |
| 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->stm(db_w, sp, (kCallerSaved | lr.bit()) & ~scratch1_.bit()); |
| if (mode == kSaveFPRegs) { |
| masm->SaveFPRegs(sp, scratch0_); |
| } |
| } |
| |
| inline void RestoreCallerSaveRegisters(MacroAssembler*masm, |
| SaveFPRegsMode mode) { |
| if (mode == kSaveFPRegs) { |
| masm->RestoreFPRegs(sp, scratch0_); |
| } |
| masm->ldm(ia_w, sp, (kCallerSaved | lr.bit()) & ~scratch1_.bit()); |
| } |
| |
| 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 |
| }; |
| |
| 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, 4> {}; |
| class ValueBits: public BitField<int, 4, 4> {}; |
| class AddressBits: public BitField<int, 8, 4> {}; |
| class RememberedSetActionBits: public BitField<RememberedSetAction, 12, 1> {}; |
| class SaveFPRegsModeBits: public BitField<SaveFPRegsMode, 13, 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() { 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); |
| |
| 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; |
| |
| 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 v8::internal |
| |
| #endif // V8_ARM_CODE_STUBS_ARM_H_ |