| // 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. |
| |
| #ifndef V8_ARM64_CODE_STUBS_ARM64_H_ |
| #define V8_ARM64_CODE_STUBS_ARM64_H_ |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| class StringHelper : public AllStatic { |
| public: |
| // Compares two flat one-byte strings and returns result in x0. |
| static void GenerateCompareFlatOneByteStrings( |
| MacroAssembler* masm, Register left, Register right, Register scratch1, |
| Register scratch2, Register scratch3, Register scratch4); |
| |
| // Compare two flat one-byte strings for equality and returns result in x0. |
| 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); |
| }; |
| |
| |
| class RecordWriteStub: public PlatformCodeStub { |
| public: |
| // Stub to record the write of 'value' at 'address' in 'object'. |
| // Typically 'address' = 'object' + <some offset>. |
| // See MacroAssembler::RecordWriteField() for example. |
| 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. |
| DCHECK(object.Is64Bits()); |
| DCHECK(value.Is64Bits()); |
| DCHECK(address.Is64Bits()); |
| 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 Mode GetMode(Code* stub); |
| |
| static void Patch(Code* stub, Mode mode); |
| |
| DEFINE_NULL_CALL_INTERFACE_DESCRIPTOR(); |
| |
| private: |
| // This is a helper class to manage the registers associated with the stub. |
| // The 'object' and 'address' registers must be preserved. |
| class RegisterAllocation { |
| public: |
| RegisterAllocation(Register object, Register address, Register scratch); |
| |
| void Save(MacroAssembler* masm) { |
| // We don't have to save scratch0_ because it was given to us as |
| // a scratch register. |
| masm->Push(scratch1_, scratch2_); |
| } |
| |
| void Restore(MacroAssembler* masm) { |
| masm->Pop(scratch2_, scratch1_); |
| } |
| |
| // If we have to call into C then we need to save and restore all caller- |
| // saved registers that were not already preserved. |
| void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) { |
| // TODO(all): This can be very expensive, and it is likely that not every |
| // register will need to be preserved. Can we improve this? |
| masm->PushCPURegList(saved_regs_); |
| if (mode == kSaveFPRegs) { |
| masm->PushCPURegList(saved_fp_regs_); |
| } |
| } |
| |
| void RestoreCallerSaveRegisters(MacroAssembler*masm, SaveFPRegsMode mode) { |
| // TODO(all): This can be very expensive, and it is likely that not every |
| // register will need to be preserved. Can we improve this? |
| if (mode == kSaveFPRegs) { |
| masm->PopCPURegList(saved_fp_regs_); |
| } |
| masm->PopCPURegList(saved_regs_); |
| } |
| |
| Register object() { return object_; } |
| Register address() { return address_; } |
| Register scratch0() { return scratch0_; } |
| Register scratch1() { return scratch1_; } |
| Register scratch2() { return scratch2_; } |
| |
| private: |
| Register object_; |
| Register address_; |
| Register scratch0_; |
| Register scratch1_ = NoReg; |
| Register scratch2_ = NoReg; |
| CPURegList saved_regs_; |
| CPURegList saved_fp_regs_; |
| |
| // TODO(all): We should consider moving this somewhere else. |
| static CPURegList GetValidRegistersForAllocation() { |
| // The list of valid registers for allocation is defined as all the |
| // registers without those with a special meaning. |
| // |
| // The default list excludes registers x26 to x31 because they are |
| // reserved for the following purpose: |
| // - x26 root register |
| // - x27 context pointer register |
| // - x28 jssp |
| // - x29 frame pointer |
| // - x30 link register(lr) |
| // - x31 xzr/stack pointer |
| CPURegList list(CPURegister::kRegister, kXRegSizeInBits, 0, 25); |
| |
| // We also remove MacroAssembler's scratch registers. |
| list.Remove(MacroAssembler::DefaultTmpList()); |
| |
| return list; |
| } |
| |
| 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; |
| |
| 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_; |
| }; |
| |
| |
| // Helper to call C++ functions from generated code. The caller must prepare |
| // the exit frame before doing the call with GenerateCall. |
| 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_ARM64_CODE_STUBS_ARM64_H_ |