| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_ARM_CODE_STUBS_ARM_H_ |
| #define V8_ARM_CODE_STUBS_ARM_H_ |
| |
| #include "ic-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code); |
| |
| |
| // Compute a transcendental math function natively, or call the |
| // TranscendentalCache runtime function. |
| class TranscendentalCacheStub: public PlatformCodeStub { |
| public: |
| enum ArgumentType { |
| TAGGED = 0 << TranscendentalCache::kTranscendentalTypeBits, |
| UNTAGGED = 1 << TranscendentalCache::kTranscendentalTypeBits |
| }; |
| |
| TranscendentalCacheStub(TranscendentalCache::Type type, |
| ArgumentType argument_type) |
| : type_(type), argument_type_(argument_type) { } |
| void Generate(MacroAssembler* masm); |
| private: |
| TranscendentalCache::Type type_; |
| ArgumentType argument_type_; |
| void GenerateCallCFunction(MacroAssembler* masm, Register scratch); |
| |
| Major MajorKey() { return TranscendentalCache; } |
| int MinorKey() { return type_ | argument_type_; } |
| Runtime::FunctionId RuntimeFunction(); |
| }; |
| |
| |
| class StoreBufferOverflowStub: public PlatformCodeStub { |
| public: |
| explicit StoreBufferOverflowStub(SaveFPRegsMode save_fp) |
| : save_doubles_(save_fp) {} |
| |
| void Generate(MacroAssembler* masm); |
| |
| virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE { return true; } |
| static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate); |
| virtual bool SometimesSetsUpAFrame() { return false; } |
| |
| private: |
| SaveFPRegsMode save_doubles_; |
| |
| Major MajorKey() { return StoreBufferOverflow; } |
| int MinorKey() { return (save_doubles_ == kSaveFPRegs) ? 1 : 0; } |
| }; |
| |
| |
| class StringHelper : public AllStatic { |
| public: |
| // Generate code for copying characters using a simple loop. This should only |
| // be used in places where the number of characters is small and the |
| // additional setup and checking in GenerateCopyCharactersLong adds too much |
| // overhead. 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, |
| bool ascii); |
| |
| // 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 GenerateCopyCharactersLong(MacroAssembler* masm, |
| Register dest, |
| Register src, |
| Register count, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3, |
| Register scratch4, |
| int flags); |
| |
| |
| // Probe the string table for a two character string. If the string is |
| // not found by probing a jump to the label not_found is performed. This jump |
| // does not guarantee that the string is not in the string table. If the |
| // string is found the code falls through with the string in register r0. |
| // Contents of both c1 and c2 registers are modified. At the exit c1 is |
| // guaranteed to contain halfword with low and high bytes equal to |
| // initial contents of c1 and c2 respectively. |
| static void GenerateTwoCharacterStringTableProbe(MacroAssembler* masm, |
| Register c1, |
| Register c2, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3, |
| Register scratch4, |
| Register scratch5, |
| Label* not_found); |
| |
| // Generate string hash. |
| static void GenerateHashInit(MacroAssembler* masm, |
| Register hash, |
| Register character); |
| |
| static void GenerateHashAddCharacter(MacroAssembler* masm, |
| Register hash, |
| Register character); |
| |
| static void GenerateHashGetHash(MacroAssembler* masm, |
| Register hash); |
| |
| private: |
| DISALLOW_IMPLICIT_CONSTRUCTORS(StringHelper); |
| }; |
| |
| |
| class StringAddStub: public PlatformCodeStub { |
| public: |
| explicit StringAddStub(StringAddFlags flags) : flags_(flags) {} |
| |
| private: |
| Major MajorKey() { return StringAdd; } |
| int MinorKey() { return flags_; } |
| |
| void Generate(MacroAssembler* masm); |
| |
| void GenerateConvertArgument(MacroAssembler* masm, |
| int stack_offset, |
| Register arg, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3, |
| Register scratch4, |
| Label* slow); |
| |
| void GenerateRegisterArgsPush(MacroAssembler* masm); |
| void GenerateRegisterArgsPop(MacroAssembler* masm); |
| |
| const StringAddFlags flags_; |
| }; |
| |
| |
| class SubStringStub: public PlatformCodeStub { |
| public: |
| SubStringStub() {} |
| |
| private: |
| Major MajorKey() { return SubString; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| }; |
| |
| |
| |
| class StringCompareStub: public PlatformCodeStub { |
| public: |
| StringCompareStub() { } |
| |
| // Compares two flat ASCII strings and returns result in r0. |
| static void GenerateCompareFlatAsciiStrings(MacroAssembler* masm, |
| Register left, |
| Register right, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3, |
| Register scratch4); |
| |
| // Compares two flat ASCII strings for equality and returns result |
| // in r0. |
| static void GenerateFlatAsciiStringEquals(MacroAssembler* masm, |
| Register left, |
| Register right, |
| Register scratch1, |
| Register scratch2, |
| Register scratch3); |
| |
| private: |
| virtual Major MajorKey() { return StringCompare; } |
| virtual int MinorKey() { return 0; } |
| virtual void Generate(MacroAssembler* masm); |
| |
| static void GenerateAsciiCharsCompareLoop(MacroAssembler* masm, |
| Register left, |
| Register right, |
| Register length, |
| Register scratch1, |
| Register scratch2, |
| Label* chars_not_equal); |
| }; |
| |
| |
| // 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(Register the_int, |
| Register the_heap_number, |
| Register scratch) |
| : the_int_(the_int), |
| the_heap_number_(the_heap_number), |
| scratch_(scratch) { } |
| |
| virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE; |
| static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate); |
| |
| private: |
| Register the_int_; |
| Register the_heap_number_; |
| Register scratch_; |
| |
| // 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> {}; |
| |
| Major MajorKey() { return WriteInt32ToHeapNumber; } |
| int MinorKey() { |
| // Encode the parameters in a unique 16 bit value. |
| return IntRegisterBits::encode(the_int_.code()) |
| | HeapNumberRegisterBits::encode(the_heap_number_.code()) |
| | ScratchRegisterBits::encode(scratch_.code()); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| }; |
| |
| |
| class RecordWriteStub: public PlatformCodeStub { |
| public: |
| RecordWriteStub(Register object, |
| Register value, |
| Register address, |
| RememberedSetAction remembered_set_action, |
| SaveFPRegsMode fp_mode) |
| : object_(object), |
| value_(value), |
| address_(address), |
| remembered_set_action_(remembered_set_action), |
| save_fp_regs_mode_(fp_mode), |
| regs_(object, // An input reg. |
| address, // An input reg. |
| value) { // One scratch reg. |
| } |
| |
| enum Mode { |
| STORE_BUFFER_ONLY, |
| INCREMENTAL, |
| INCREMENTAL_COMPACTION |
| }; |
| |
| virtual bool IsPregenerated(Isolate* isolate) V8_OVERRIDE; |
| static void GenerateFixedRegStubsAheadOfTime(Isolate* isolate); |
| virtual bool SometimesSetsUpAFrame() { return false; } |
| |
| static void PatchBranchIntoNop(MacroAssembler* masm, int pos) { |
| masm->instr_at_put(pos, (masm->instr_at(pos) & ~B27) | (B24 | B20)); |
| ASSERT(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); |
| ASSERT(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; |
| } |
| |
| ASSERT(Assembler::IsTstImmediate(first_instruction)); |
| |
| if (Assembler::IsBranch(second_instruction)) { |
| return INCREMENTAL_COMPACTION; |
| } |
| |
| ASSERT(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: |
| ASSERT(GetMode(stub) == INCREMENTAL || |
| GetMode(stub) == INCREMENTAL_COMPACTION); |
| PatchBranchIntoNop(&masm, 0); |
| PatchBranchIntoNop(&masm, Assembler::kInstrSize); |
| break; |
| case INCREMENTAL: |
| ASSERT(GetMode(stub) == STORE_BUFFER_ONLY); |
| PatchNopIntoBranch(&masm, 0); |
| break; |
| case INCREMENTAL_COMPACTION: |
| ASSERT(GetMode(stub) == STORE_BUFFER_ONLY); |
| PatchNopIntoBranch(&masm, Assembler::kInstrSize); |
| break; |
| } |
| ASSERT(GetMode(stub) == mode); |
| CPU::FlushICache(stub->instruction_start(), 2 * Assembler::kInstrSize); |
| } |
| |
| 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) { |
| ASSERT(!AreAliased(scratch0, object, address, no_reg)); |
| scratch1_ = GetRegisterThatIsNotOneOf(object_, address_, scratch0_); |
| } |
| |
| void Save(MacroAssembler* masm) { |
| ASSERT(!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 |
| }; |
| |
| void Generate(MacroAssembler* masm); |
| void GenerateIncremental(MacroAssembler* masm, Mode mode); |
| void CheckNeedsToInformIncrementalMarker( |
| MacroAssembler* masm, |
| OnNoNeedToInformIncrementalMarker on_no_need, |
| Mode mode); |
| void InformIncrementalMarker(MacroAssembler* masm, Mode mode); |
| |
| Major MajorKey() { return RecordWrite; } |
| |
| int MinorKey() { |
| return ObjectBits::encode(object_.code()) | |
| ValueBits::encode(value_.code()) | |
| AddressBits::encode(address_.code()) | |
| RememberedSetActionBits::encode(remembered_set_action_) | |
| SaveFPRegsModeBits::encode(save_fp_regs_mode_); |
| } |
| |
| void Activate(Code* code) { |
| code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code); |
| } |
| |
| 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> {}; |
| |
| Register object_; |
| Register value_; |
| Register address_; |
| RememberedSetAction remembered_set_action_; |
| SaveFPRegsMode save_fp_regs_mode_; |
| Label slow_; |
| RegisterAllocation regs_; |
| }; |
| |
| |
| // 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: |
| DirectCEntryStub() {} |
| void Generate(MacroAssembler* masm); |
| void GenerateCall(MacroAssembler* masm, Register target); |
| |
| private: |
| Major MajorKey() { return DirectCEntry; } |
| int MinorKey() { return 0; } |
| |
| bool NeedsImmovableCode() { return true; } |
| }; |
| |
| |
| class NameDictionaryLookupStub: public PlatformCodeStub { |
| public: |
| enum LookupMode { POSITIVE_LOOKUP, NEGATIVE_LOOKUP }; |
| |
| explicit NameDictionaryLookupStub(LookupMode mode) : mode_(mode) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| 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; |
| |
| Major MajorKey() { return NameDictionaryLookup; } |
| |
| int MinorKey() { |
| return LookupModeBits::encode(mode_); |
| } |
| |
| class LookupModeBits: public BitField<LookupMode, 0, 1> {}; |
| |
| LookupMode mode_; |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_ARM_CODE_STUBS_ARM_H_ |