| // Copyright 2011 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_CODE_STUBS_H_ |
| #define V8_CODE_STUBS_H_ |
| |
| #include "allocation.h" |
| #include "globals.h" |
| #include "codegen.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // List of code stubs used on all platforms. |
| #define CODE_STUB_LIST_ALL_PLATFORMS(V) \ |
| V(CallFunction) \ |
| V(UnaryOp) \ |
| V(BinaryOp) \ |
| V(StringAdd) \ |
| V(SubString) \ |
| V(StringCompare) \ |
| V(Compare) \ |
| V(CompareIC) \ |
| V(MathPow) \ |
| V(RecordWrite) \ |
| V(StoreBufferOverflow) \ |
| V(RegExpExec) \ |
| V(TranscendentalCache) \ |
| V(Instanceof) \ |
| V(ConvertToDouble) \ |
| V(WriteInt32ToHeapNumber) \ |
| V(StackCheck) \ |
| V(FastNewClosure) \ |
| V(FastNewContext) \ |
| V(FastNewBlockContext) \ |
| V(FastCloneShallowArray) \ |
| V(FastCloneShallowObject) \ |
| V(ToBoolean) \ |
| V(ToNumber) \ |
| V(ArgumentsAccess) \ |
| V(RegExpConstructResult) \ |
| V(NumberToString) \ |
| V(CEntry) \ |
| V(JSEntry) \ |
| V(KeyedLoadElement) \ |
| V(KeyedStoreElement) \ |
| V(DebuggerStatement) \ |
| V(StringDictionaryLookup) \ |
| V(ElementsTransitionAndStore) \ |
| V(StoreArrayLiteralElement) |
| |
| // List of code stubs only used on ARM platforms. |
| #ifdef V8_TARGET_ARCH_ARM |
| #define CODE_STUB_LIST_ARM(V) \ |
| V(GetProperty) \ |
| V(SetProperty) \ |
| V(InvokeBuiltin) \ |
| V(RegExpCEntry) \ |
| V(DirectCEntry) |
| #else |
| #define CODE_STUB_LIST_ARM(V) |
| #endif |
| |
| // List of code stubs only used on MIPS platforms. |
| #ifdef V8_TARGET_ARCH_MIPS |
| #define CODE_STUB_LIST_MIPS(V) \ |
| V(RegExpCEntry) \ |
| V(DirectCEntry) |
| #else |
| #define CODE_STUB_LIST_MIPS(V) |
| #endif |
| |
| // Combined list of code stubs. |
| #define CODE_STUB_LIST(V) \ |
| CODE_STUB_LIST_ALL_PLATFORMS(V) \ |
| CODE_STUB_LIST_ARM(V) \ |
| CODE_STUB_LIST_MIPS(V) |
| |
| // Mode to overwrite BinaryExpression values. |
| enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT }; |
| enum UnaryOverwriteMode { UNARY_OVERWRITE, UNARY_NO_OVERWRITE }; |
| |
| |
| // Stub is base classes of all stubs. |
| class CodeStub BASE_EMBEDDED { |
| public: |
| enum Major { |
| #define DEF_ENUM(name) name, |
| CODE_STUB_LIST(DEF_ENUM) |
| #undef DEF_ENUM |
| NoCache, // marker for stubs that do custom caching |
| NUMBER_OF_IDS |
| }; |
| |
| // Retrieve the code for the stub. Generate the code if needed. |
| Handle<Code> GetCode(); |
| |
| static Major MajorKeyFromKey(uint32_t key) { |
| return static_cast<Major>(MajorKeyBits::decode(key)); |
| } |
| static int MinorKeyFromKey(uint32_t key) { |
| return MinorKeyBits::decode(key); |
| } |
| |
| // Gets the major key from a code object that is a code stub or binary op IC. |
| static Major GetMajorKey(Code* code_stub) { |
| return static_cast<Major>(code_stub->major_key()); |
| } |
| |
| static const char* MajorName(Major major_key, bool allow_unknown_keys); |
| |
| virtual ~CodeStub() {} |
| |
| bool CompilingCallsToThisStubIsGCSafe() { |
| bool is_pregenerated = IsPregenerated(); |
| Code* code = NULL; |
| CHECK(!is_pregenerated || FindCodeInCache(&code)); |
| return is_pregenerated; |
| } |
| |
| // See comment above, where Instanceof is defined. |
| virtual bool IsPregenerated() { return false; } |
| |
| static void GenerateStubsAheadOfTime(); |
| static void GenerateFPStubs(); |
| |
| // Some stubs put untagged junk on the stack that cannot be scanned by the |
| // GC. This means that we must be statically sure that no GC can occur while |
| // they are running. If that is the case they should override this to return |
| // true, which will cause an assertion if we try to call something that can |
| // GC or if we try to put a stack frame on top of the junk, which would not |
| // result in a traversable stack. |
| virtual bool SometimesSetsUpAFrame() { return true; } |
| |
| // Lookup the code in the (possibly custom) cache. |
| bool FindCodeInCache(Code** code_out); |
| |
| protected: |
| static const int kMajorBits = 6; |
| static const int kMinorBits = kBitsPerInt - kSmiTagSize - kMajorBits; |
| |
| private: |
| // Nonvirtual wrapper around the stub-specific Generate function. Call |
| // this function to set up the macro assembler and generate the code. |
| void GenerateCode(MacroAssembler* masm); |
| |
| // Generates the assembler code for the stub. |
| virtual void Generate(MacroAssembler* masm) = 0; |
| |
| // Perform bookkeeping required after code generation when stub code is |
| // initially generated. |
| void RecordCodeGeneration(Code* code, MacroAssembler* masm); |
| |
| // Finish the code object after it has been generated. |
| virtual void FinishCode(Handle<Code> code) { } |
| |
| // Activate newly generated stub. Is called after |
| // registering stub in the stub cache. |
| virtual void Activate(Code* code) { } |
| |
| // Returns information for computing the number key. |
| virtual Major MajorKey() = 0; |
| virtual int MinorKey() = 0; |
| |
| // BinaryOpStub needs to override this. |
| virtual int GetCodeKind(); |
| |
| // BinaryOpStub needs to override this. |
| virtual InlineCacheState GetICState() { |
| return UNINITIALIZED; |
| } |
| |
| // Add the code to a specialized cache, specific to an individual |
| // stub type. Please note, this method must add the code object to a |
| // roots object, otherwise we will remove the code during GC. |
| virtual void AddToSpecialCache(Handle<Code> new_object) { } |
| |
| // Find code in a specialized cache, work is delegated to the specific stub. |
| virtual bool FindCodeInSpecialCache(Code** code_out) { return false; } |
| |
| // If a stub uses a special cache override this. |
| virtual bool UseSpecialCache() { return false; } |
| |
| // Returns a name for logging/debugging purposes. |
| SmartArrayPointer<const char> GetName(); |
| virtual void PrintName(StringStream* stream); |
| |
| // Returns whether the code generated for this stub needs to be allocated as |
| // a fixed (non-moveable) code object. |
| virtual bool NeedsImmovableCode() { return false; } |
| |
| // Computes the key based on major and minor. |
| uint32_t GetKey() { |
| ASSERT(static_cast<int>(MajorKey()) < NUMBER_OF_IDS); |
| return MinorKeyBits::encode(MinorKey()) | |
| MajorKeyBits::encode(MajorKey()); |
| } |
| |
| class MajorKeyBits: public BitField<uint32_t, 0, kMajorBits> {}; |
| class MinorKeyBits: public BitField<uint32_t, kMajorBits, kMinorBits> {}; |
| |
| friend class BreakPointIterator; |
| }; |
| |
| |
| // Helper interface to prepare to/restore after making runtime calls. |
| class RuntimeCallHelper { |
| public: |
| virtual ~RuntimeCallHelper() {} |
| |
| virtual void BeforeCall(MacroAssembler* masm) const = 0; |
| |
| virtual void AfterCall(MacroAssembler* masm) const = 0; |
| |
| protected: |
| RuntimeCallHelper() {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(RuntimeCallHelper); |
| }; |
| |
| } } // namespace v8::internal |
| |
| #if V8_TARGET_ARCH_IA32 |
| #include "ia32/code-stubs-ia32.h" |
| #elif V8_TARGET_ARCH_X64 |
| #include "x64/code-stubs-x64.h" |
| #elif V8_TARGET_ARCH_ARM |
| #include "arm/code-stubs-arm.h" |
| #elif V8_TARGET_ARCH_MIPS |
| #include "mips/code-stubs-mips.h" |
| #else |
| #error Unsupported target architecture. |
| #endif |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // RuntimeCallHelper implementation used in stubs: enters/leaves a |
| // newly created internal frame before/after the runtime call. |
| class StubRuntimeCallHelper : public RuntimeCallHelper { |
| public: |
| StubRuntimeCallHelper() {} |
| |
| virtual void BeforeCall(MacroAssembler* masm) const; |
| |
| virtual void AfterCall(MacroAssembler* masm) const; |
| }; |
| |
| |
| // Trivial RuntimeCallHelper implementation. |
| class NopRuntimeCallHelper : public RuntimeCallHelper { |
| public: |
| NopRuntimeCallHelper() {} |
| |
| virtual void BeforeCall(MacroAssembler* masm) const {} |
| |
| virtual void AfterCall(MacroAssembler* masm) const {} |
| }; |
| |
| |
| class StackCheckStub : public CodeStub { |
| public: |
| StackCheckStub() { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return StackCheck; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| class ToNumberStub: public CodeStub { |
| public: |
| ToNumberStub() { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return ToNumber; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| class FastNewClosureStub : public CodeStub { |
| public: |
| explicit FastNewClosureStub(LanguageMode language_mode) |
| : language_mode_(language_mode) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return FastNewClosure; } |
| int MinorKey() { return language_mode_ == CLASSIC_MODE |
| ? kNonStrictMode : kStrictMode; } |
| |
| LanguageMode language_mode_; |
| }; |
| |
| |
| class FastNewContextStub : public CodeStub { |
| public: |
| static const int kMaximumSlots = 64; |
| |
| explicit FastNewContextStub(int slots) : slots_(slots) { |
| ASSERT(slots_ > 0 && slots_ <= kMaximumSlots); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int slots_; |
| |
| Major MajorKey() { return FastNewContext; } |
| int MinorKey() { return slots_; } |
| }; |
| |
| |
| class FastNewBlockContextStub : public CodeStub { |
| public: |
| static const int kMaximumSlots = 64; |
| |
| explicit FastNewBlockContextStub(int slots) : slots_(slots) { |
| ASSERT(slots_ > 0 && slots_ <= kMaximumSlots); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int slots_; |
| |
| Major MajorKey() { return FastNewBlockContext; } |
| int MinorKey() { return slots_; } |
| }; |
| |
| |
| class FastCloneShallowArrayStub : public CodeStub { |
| public: |
| // Maximum length of copied elements array. |
| static const int kMaximumClonedLength = 8; |
| |
| enum Mode { |
| CLONE_ELEMENTS, |
| CLONE_DOUBLE_ELEMENTS, |
| COPY_ON_WRITE_ELEMENTS, |
| CLONE_ANY_ELEMENTS |
| }; |
| |
| FastCloneShallowArrayStub(Mode mode, int length) |
| : mode_(mode), |
| length_((mode == COPY_ON_WRITE_ELEMENTS) ? 0 : length) { |
| ASSERT_GE(length_, 0); |
| ASSERT_LE(length_, kMaximumClonedLength); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Mode mode_; |
| int length_; |
| |
| Major MajorKey() { return FastCloneShallowArray; } |
| int MinorKey() { |
| ASSERT(mode_ == 0 || mode_ == 1 || mode_ == 2 || mode_ == 3); |
| return length_ * 4 + mode_; |
| } |
| }; |
| |
| |
| class FastCloneShallowObjectStub : public CodeStub { |
| public: |
| // Maximum number of properties in copied object. |
| static const int kMaximumClonedProperties = 6; |
| |
| explicit FastCloneShallowObjectStub(int length) : length_(length) { |
| ASSERT_GE(length_, 0); |
| ASSERT_LE(length_, kMaximumClonedProperties); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int length_; |
| |
| Major MajorKey() { return FastCloneShallowObject; } |
| int MinorKey() { return length_; } |
| }; |
| |
| |
| class InstanceofStub: public CodeStub { |
| public: |
| enum Flags { |
| kNoFlags = 0, |
| kArgsInRegisters = 1 << 0, |
| kCallSiteInlineCheck = 1 << 1, |
| kReturnTrueFalseObject = 1 << 2 |
| }; |
| |
| explicit InstanceofStub(Flags flags) : flags_(flags) { } |
| |
| static Register left(); |
| static Register right(); |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return Instanceof; } |
| int MinorKey() { return static_cast<int>(flags_); } |
| |
| bool HasArgsInRegisters() const { |
| return (flags_ & kArgsInRegisters) != 0; |
| } |
| |
| bool HasCallSiteInlineCheck() const { |
| return (flags_ & kCallSiteInlineCheck) != 0; |
| } |
| |
| bool ReturnTrueFalseObject() const { |
| return (flags_ & kReturnTrueFalseObject) != 0; |
| } |
| |
| virtual void PrintName(StringStream* stream); |
| |
| Flags flags_; |
| }; |
| |
| |
| class MathPowStub: public CodeStub { |
| public: |
| enum ExponentType { INTEGER, DOUBLE, TAGGED, ON_STACK}; |
| |
| explicit MathPowStub(ExponentType exponent_type) |
| : exponent_type_(exponent_type) { } |
| virtual void Generate(MacroAssembler* masm); |
| |
| private: |
| virtual CodeStub::Major MajorKey() { return MathPow; } |
| virtual int MinorKey() { return exponent_type_; } |
| |
| ExponentType exponent_type_; |
| }; |
| |
| |
| class ICCompareStub: public CodeStub { |
| public: |
| ICCompareStub(Token::Value op, CompareIC::State state) |
| : op_(op), state_(state) { |
| ASSERT(Token::IsCompareOp(op)); |
| } |
| |
| virtual void Generate(MacroAssembler* masm); |
| |
| void set_known_map(Handle<Map> map) { known_map_ = map; } |
| |
| private: |
| class OpField: public BitField<int, 0, 3> { }; |
| class StateField: public BitField<int, 3, 5> { }; |
| |
| virtual void FinishCode(Handle<Code> code) { |
| code->set_compare_state(state_); |
| } |
| |
| virtual CodeStub::Major MajorKey() { return CompareIC; } |
| virtual int MinorKey(); |
| |
| virtual int GetCodeKind() { return Code::COMPARE_IC; } |
| |
| void GenerateSmis(MacroAssembler* masm); |
| void GenerateHeapNumbers(MacroAssembler* masm); |
| void GenerateSymbols(MacroAssembler* masm); |
| void GenerateStrings(MacroAssembler* masm); |
| void GenerateObjects(MacroAssembler* masm); |
| void GenerateMiss(MacroAssembler* masm); |
| void GenerateKnownObjects(MacroAssembler* masm); |
| |
| bool strict() const { return op_ == Token::EQ_STRICT; } |
| Condition GetCondition() const { return CompareIC::ComputeCondition(op_); } |
| |
| virtual void AddToSpecialCache(Handle<Code> new_object); |
| virtual bool FindCodeInSpecialCache(Code** code_out); |
| virtual bool UseSpecialCache() { return state_ == CompareIC::KNOWN_OBJECTS; } |
| |
| Token::Value op_; |
| CompareIC::State state_; |
| Handle<Map> known_map_; |
| }; |
| |
| |
| // Flags that control the compare stub code generation. |
| enum CompareFlags { |
| NO_COMPARE_FLAGS = 0, |
| NO_SMI_COMPARE_IN_STUB = 1 << 0, |
| NO_NUMBER_COMPARE_IN_STUB = 1 << 1, |
| CANT_BOTH_BE_NAN = 1 << 2 |
| }; |
| |
| |
| enum NaNInformation { |
| kBothCouldBeNaN, |
| kCantBothBeNaN |
| }; |
| |
| |
| class CompareStub: public CodeStub { |
| public: |
| CompareStub(Condition cc, |
| bool strict, |
| CompareFlags flags, |
| Register lhs, |
| Register rhs) : |
| cc_(cc), |
| strict_(strict), |
| never_nan_nan_((flags & CANT_BOTH_BE_NAN) != 0), |
| include_number_compare_((flags & NO_NUMBER_COMPARE_IN_STUB) == 0), |
| include_smi_compare_((flags & NO_SMI_COMPARE_IN_STUB) == 0), |
| lhs_(lhs), |
| rhs_(rhs) { } |
| |
| CompareStub(Condition cc, |
| bool strict, |
| CompareFlags flags) : |
| cc_(cc), |
| strict_(strict), |
| never_nan_nan_((flags & CANT_BOTH_BE_NAN) != 0), |
| include_number_compare_((flags & NO_NUMBER_COMPARE_IN_STUB) == 0), |
| include_smi_compare_((flags & NO_SMI_COMPARE_IN_STUB) == 0), |
| lhs_(no_reg), |
| rhs_(no_reg) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Condition cc_; |
| bool strict_; |
| // Only used for 'equal' comparisons. Tells the stub that we already know |
| // that at least one side of the comparison is not NaN. This allows the |
| // stub to use object identity in the positive case. We ignore it when |
| // generating the minor key for other comparisons to avoid creating more |
| // stubs. |
| bool never_nan_nan_; |
| // Do generate the number comparison code in the stub. Stubs without number |
| // comparison code is used when the number comparison has been inlined, and |
| // the stub will be called if one of the operands is not a number. |
| bool include_number_compare_; |
| |
| // Generate the comparison code for two smi operands in the stub. |
| bool include_smi_compare_; |
| |
| // Register holding the left hand side of the comparison if the stub gives |
| // a choice, no_reg otherwise. |
| |
| Register lhs_; |
| // Register holding the right hand side of the comparison if the stub gives |
| // a choice, no_reg otherwise. |
| Register rhs_; |
| |
| // Encoding of the minor key in 16 bits. |
| class StrictField: public BitField<bool, 0, 1> {}; |
| class NeverNanNanField: public BitField<bool, 1, 1> {}; |
| class IncludeNumberCompareField: public BitField<bool, 2, 1> {}; |
| class IncludeSmiCompareField: public BitField<bool, 3, 1> {}; |
| class RegisterField: public BitField<bool, 4, 1> {}; |
| class ConditionField: public BitField<int, 5, 11> {}; |
| |
| Major MajorKey() { return Compare; } |
| |
| int MinorKey(); |
| |
| virtual int GetCodeKind() { return Code::COMPARE_IC; } |
| virtual void FinishCode(Handle<Code> code) { |
| code->set_compare_state(CompareIC::GENERIC); |
| } |
| |
| // Branch to the label if the given object isn't a symbol. |
| void BranchIfNonSymbol(MacroAssembler* masm, |
| Label* label, |
| Register object, |
| Register scratch); |
| |
| // Unfortunately you have to run without snapshots to see most of these |
| // names in the profile since most compare stubs end up in the snapshot. |
| virtual void PrintName(StringStream* stream); |
| }; |
| |
| |
| class CEntryStub : public CodeStub { |
| public: |
| explicit CEntryStub(int result_size, |
| SaveFPRegsMode save_doubles = kDontSaveFPRegs) |
| : result_size_(result_size), save_doubles_(save_doubles) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| // The version of this stub that doesn't save doubles is generated ahead of |
| // time, so it's OK to call it from other stubs that can't cope with GC during |
| // their code generation. On machines that always have gp registers (x64) we |
| // can generate both variants ahead of time. |
| virtual bool IsPregenerated(); |
| static void GenerateAheadOfTime(); |
| |
| private: |
| void GenerateCore(MacroAssembler* masm, |
| Label* throw_normal_exception, |
| Label* throw_termination_exception, |
| Label* throw_out_of_memory_exception, |
| bool do_gc, |
| bool always_allocate_scope); |
| void GenerateThrowTOS(MacroAssembler* masm); |
| void GenerateThrowUncatchable(MacroAssembler* masm, |
| UncatchableExceptionType type); |
| |
| // Number of pointers/values returned. |
| const int result_size_; |
| SaveFPRegsMode save_doubles_; |
| |
| Major MajorKey() { return CEntry; } |
| int MinorKey(); |
| |
| bool NeedsImmovableCode(); |
| }; |
| |
| |
| class JSEntryStub : public CodeStub { |
| public: |
| JSEntryStub() { } |
| |
| void Generate(MacroAssembler* masm) { GenerateBody(masm, false); } |
| |
| protected: |
| void GenerateBody(MacroAssembler* masm, bool is_construct); |
| |
| private: |
| Major MajorKey() { return JSEntry; } |
| int MinorKey() { return 0; } |
| |
| virtual void FinishCode(Handle<Code> code); |
| |
| int handler_offset_; |
| }; |
| |
| |
| class JSConstructEntryStub : public JSEntryStub { |
| public: |
| JSConstructEntryStub() { } |
| |
| void Generate(MacroAssembler* masm) { GenerateBody(masm, true); } |
| |
| private: |
| int MinorKey() { return 1; } |
| |
| virtual void PrintName(StringStream* stream) { |
| stream->Add("JSConstructEntryStub"); |
| } |
| }; |
| |
| |
| class ArgumentsAccessStub: public CodeStub { |
| public: |
| enum Type { |
| READ_ELEMENT, |
| NEW_NON_STRICT_FAST, |
| NEW_NON_STRICT_SLOW, |
| NEW_STRICT |
| }; |
| |
| explicit ArgumentsAccessStub(Type type) : type_(type) { } |
| |
| private: |
| Type type_; |
| |
| Major MajorKey() { return ArgumentsAccess; } |
| int MinorKey() { return type_; } |
| |
| void Generate(MacroAssembler* masm); |
| void GenerateReadElement(MacroAssembler* masm); |
| void GenerateNewStrict(MacroAssembler* masm); |
| void GenerateNewNonStrictFast(MacroAssembler* masm); |
| void GenerateNewNonStrictSlow(MacroAssembler* masm); |
| |
| virtual void PrintName(StringStream* stream); |
| }; |
| |
| |
| class RegExpExecStub: public CodeStub { |
| public: |
| RegExpExecStub() { } |
| |
| private: |
| Major MajorKey() { return RegExpExec; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| }; |
| |
| |
| class RegExpConstructResultStub: public CodeStub { |
| public: |
| RegExpConstructResultStub() { } |
| |
| private: |
| Major MajorKey() { return RegExpConstructResult; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| }; |
| |
| |
| class CallFunctionStub: public CodeStub { |
| public: |
| CallFunctionStub(int argc, CallFunctionFlags flags) |
| : argc_(argc), flags_(flags) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| virtual void FinishCode(Handle<Code> code); |
| |
| static void Clear(Heap* heap, Address address); |
| |
| static Object* GetCachedValue(Address address); |
| |
| static int ExtractArgcFromMinorKey(int minor_key) { |
| return ArgcBits::decode(minor_key); |
| } |
| |
| // The object that indicates an uninitialized cache. |
| static Handle<Object> UninitializedSentinel(Isolate* isolate) { |
| return isolate->factory()->the_hole_value(); |
| } |
| |
| // A raw version of the uninitialized sentinel that's safe to read during |
| // garbage collection (e.g., for patching the cache). |
| static Object* RawUninitializedSentinel(Heap* heap) { |
| return heap->raw_unchecked_the_hole_value(); |
| } |
| |
| // The object that indicates a megamorphic state. |
| static Handle<Object> MegamorphicSentinel(Isolate* isolate) { |
| return isolate->factory()->undefined_value(); |
| } |
| |
| private: |
| int argc_; |
| CallFunctionFlags flags_; |
| |
| virtual void PrintName(StringStream* stream); |
| |
| // Minor key encoding in 32 bits with Bitfield <Type, shift, size>. |
| class FlagBits: public BitField<CallFunctionFlags, 0, 2> {}; |
| class ArgcBits: public BitField<unsigned, 2, 32 - 2> {}; |
| |
| Major MajorKey() { return CallFunction; } |
| int MinorKey() { |
| // Encode the parameters in a unique 32 bit value. |
| return FlagBits::encode(flags_) | ArgcBits::encode(argc_); |
| } |
| |
| bool ReceiverMightBeImplicit() { |
| return (flags_ & RECEIVER_MIGHT_BE_IMPLICIT) != 0; |
| } |
| |
| bool RecordCallTarget() { |
| return (flags_ & RECORD_CALL_TARGET) != 0; |
| } |
| }; |
| |
| |
| enum StringIndexFlags { |
| // Accepts smis or heap numbers. |
| STRING_INDEX_IS_NUMBER, |
| |
| // Accepts smis or heap numbers that are valid array indices |
| // (ECMA-262 15.4). Invalid indices are reported as being out of |
| // range. |
| STRING_INDEX_IS_ARRAY_INDEX |
| }; |
| |
| |
| // Generates code implementing String.prototype.charCodeAt. |
| // |
| // Only supports the case when the receiver is a string and the index |
| // is a number (smi or heap number) that is a valid index into the |
| // string. Additional index constraints are specified by the |
| // flags. Otherwise, bails out to the provided labels. |
| // |
| // Register usage: |object| may be changed to another string in a way |
| // that doesn't affect charCodeAt/charAt semantics, |index| is |
| // preserved, |scratch| and |result| are clobbered. |
| class StringCharCodeAtGenerator { |
| public: |
| StringCharCodeAtGenerator(Register object, |
| Register index, |
| Register result, |
| Label* receiver_not_string, |
| Label* index_not_number, |
| Label* index_out_of_range, |
| StringIndexFlags index_flags) |
| : object_(object), |
| index_(index), |
| result_(result), |
| receiver_not_string_(receiver_not_string), |
| index_not_number_(index_not_number), |
| index_out_of_range_(index_out_of_range), |
| index_flags_(index_flags) { |
| ASSERT(!result_.is(object_)); |
| ASSERT(!result_.is(index_)); |
| } |
| |
| // Generates the fast case code. On the fallthrough path |result| |
| // register contains the result. |
| void GenerateFast(MacroAssembler* masm); |
| |
| // Generates the slow case code. Must not be naturally |
| // reachable. Expected to be put after a ret instruction (e.g., in |
| // deferred code). Always jumps back to the fast case. |
| void GenerateSlow(MacroAssembler* masm, |
| const RuntimeCallHelper& call_helper); |
| |
| private: |
| Register object_; |
| Register index_; |
| Register result_; |
| |
| Label* receiver_not_string_; |
| Label* index_not_number_; |
| Label* index_out_of_range_; |
| |
| StringIndexFlags index_flags_; |
| |
| Label call_runtime_; |
| Label index_not_smi_; |
| Label got_smi_index_; |
| Label exit_; |
| |
| DISALLOW_COPY_AND_ASSIGN(StringCharCodeAtGenerator); |
| }; |
| |
| |
| // Generates code for creating a one-char string from a char code. |
| class StringCharFromCodeGenerator { |
| public: |
| StringCharFromCodeGenerator(Register code, |
| Register result) |
| : code_(code), |
| result_(result) { |
| ASSERT(!code_.is(result_)); |
| } |
| |
| // Generates the fast case code. On the fallthrough path |result| |
| // register contains the result. |
| void GenerateFast(MacroAssembler* masm); |
| |
| // Generates the slow case code. Must not be naturally |
| // reachable. Expected to be put after a ret instruction (e.g., in |
| // deferred code). Always jumps back to the fast case. |
| void GenerateSlow(MacroAssembler* masm, |
| const RuntimeCallHelper& call_helper); |
| |
| private: |
| Register code_; |
| Register result_; |
| |
| Label slow_case_; |
| Label exit_; |
| |
| DISALLOW_COPY_AND_ASSIGN(StringCharFromCodeGenerator); |
| }; |
| |
| |
| // Generates code implementing String.prototype.charAt. |
| // |
| // Only supports the case when the receiver is a string and the index |
| // is a number (smi or heap number) that is a valid index into the |
| // string. Additional index constraints are specified by the |
| // flags. Otherwise, bails out to the provided labels. |
| // |
| // Register usage: |object| may be changed to another string in a way |
| // that doesn't affect charCodeAt/charAt semantics, |index| is |
| // preserved, |scratch1|, |scratch2|, and |result| are clobbered. |
| class StringCharAtGenerator { |
| public: |
| StringCharAtGenerator(Register object, |
| Register index, |
| Register scratch, |
| Register result, |
| Label* receiver_not_string, |
| Label* index_not_number, |
| Label* index_out_of_range, |
| StringIndexFlags index_flags) |
| : char_code_at_generator_(object, |
| index, |
| scratch, |
| receiver_not_string, |
| index_not_number, |
| index_out_of_range, |
| index_flags), |
| char_from_code_generator_(scratch, result) {} |
| |
| // Generates the fast case code. On the fallthrough path |result| |
| // register contains the result. |
| void GenerateFast(MacroAssembler* masm); |
| |
| // Generates the slow case code. Must not be naturally |
| // reachable. Expected to be put after a ret instruction (e.g., in |
| // deferred code). Always jumps back to the fast case. |
| void GenerateSlow(MacroAssembler* masm, |
| const RuntimeCallHelper& call_helper); |
| |
| private: |
| StringCharCodeAtGenerator char_code_at_generator_; |
| StringCharFromCodeGenerator char_from_code_generator_; |
| |
| DISALLOW_COPY_AND_ASSIGN(StringCharAtGenerator); |
| }; |
| |
| |
| class AllowStubCallsScope { |
| public: |
| AllowStubCallsScope(MacroAssembler* masm, bool allow) |
| : masm_(masm), previous_allow_(masm->allow_stub_calls()) { |
| masm_->set_allow_stub_calls(allow); |
| } |
| ~AllowStubCallsScope() { |
| masm_->set_allow_stub_calls(previous_allow_); |
| } |
| |
| private: |
| MacroAssembler* masm_; |
| bool previous_allow_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AllowStubCallsScope); |
| }; |
| |
| |
| class KeyedLoadElementStub : public CodeStub { |
| public: |
| explicit KeyedLoadElementStub(ElementsKind elements_kind) |
| : elements_kind_(elements_kind) |
| { } |
| |
| Major MajorKey() { return KeyedLoadElement; } |
| int MinorKey() { return elements_kind_; } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| ElementsKind elements_kind_; |
| |
| DISALLOW_COPY_AND_ASSIGN(KeyedLoadElementStub); |
| }; |
| |
| |
| class KeyedStoreElementStub : public CodeStub { |
| public: |
| KeyedStoreElementStub(bool is_js_array, |
| ElementsKind elements_kind) |
| : is_js_array_(is_js_array), |
| elements_kind_(elements_kind) { } |
| |
| Major MajorKey() { return KeyedStoreElement; } |
| int MinorKey() { |
| return (is_js_array_ ? 0 : kElementsKindCount) + elements_kind_; |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| bool is_js_array_; |
| ElementsKind elements_kind_; |
| |
| DISALLOW_COPY_AND_ASSIGN(KeyedStoreElementStub); |
| }; |
| |
| |
| class ToBooleanStub: public CodeStub { |
| public: |
| enum Type { |
| UNDEFINED, |
| BOOLEAN, |
| NULL_TYPE, |
| SMI, |
| SPEC_OBJECT, |
| STRING, |
| HEAP_NUMBER, |
| NUMBER_OF_TYPES |
| }; |
| |
| // At most 8 different types can be distinguished, because the Code object |
| // only has room for a single byte to hold a set of these types. :-P |
| STATIC_ASSERT(NUMBER_OF_TYPES <= 8); |
| |
| class Types { |
| public: |
| Types() {} |
| explicit Types(byte bits) : set_(bits) {} |
| |
| bool IsEmpty() const { return set_.IsEmpty(); } |
| bool Contains(Type type) const { return set_.Contains(type); } |
| void Add(Type type) { set_.Add(type); } |
| byte ToByte() const { return set_.ToIntegral(); } |
| void Print(StringStream* stream) const; |
| void TraceTransition(Types to) const; |
| bool Record(Handle<Object> object); |
| bool NeedsMap() const; |
| bool CanBeUndetectable() const; |
| |
| private: |
| EnumSet<Type, byte> set_; |
| }; |
| |
| static Types no_types() { return Types(); } |
| static Types all_types() { return Types((1 << NUMBER_OF_TYPES) - 1); } |
| |
| explicit ToBooleanStub(Register tos, Types types = Types()) |
| : tos_(tos), types_(types) { } |
| |
| void Generate(MacroAssembler* masm); |
| virtual int GetCodeKind() { return Code::TO_BOOLEAN_IC; } |
| virtual void PrintName(StringStream* stream); |
| |
| virtual bool SometimesSetsUpAFrame() { return false; } |
| |
| private: |
| Major MajorKey() { return ToBoolean; } |
| int MinorKey() { return (tos_.code() << NUMBER_OF_TYPES) | types_.ToByte(); } |
| |
| virtual void FinishCode(Handle<Code> code) { |
| code->set_to_boolean_state(types_.ToByte()); |
| } |
| |
| void CheckOddball(MacroAssembler* masm, |
| Type type, |
| Heap::RootListIndex value, |
| bool result); |
| void GenerateTypeTransition(MacroAssembler* masm); |
| |
| Register tos_; |
| Types types_; |
| }; |
| |
| |
| class ElementsTransitionAndStoreStub : public CodeStub { |
| public: |
| ElementsTransitionAndStoreStub(ElementsKind from, |
| ElementsKind to, |
| bool is_jsarray, |
| StrictModeFlag strict_mode) |
| : from_(from), |
| to_(to), |
| is_jsarray_(is_jsarray), |
| strict_mode_(strict_mode) {} |
| |
| private: |
| class FromBits: public BitField<ElementsKind, 0, 8> {}; |
| class ToBits: public BitField<ElementsKind, 8, 8> {}; |
| class IsJSArrayBits: public BitField<bool, 16, 8> {}; |
| class StrictModeBits: public BitField<StrictModeFlag, 24, 8> {}; |
| |
| Major MajorKey() { return ElementsTransitionAndStore; } |
| int MinorKey() { |
| return FromBits::encode(from_) | |
| ToBits::encode(to_) | |
| IsJSArrayBits::encode(is_jsarray_) | |
| StrictModeBits::encode(strict_mode_); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| ElementsKind from_; |
| ElementsKind to_; |
| bool is_jsarray_; |
| StrictModeFlag strict_mode_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ElementsTransitionAndStoreStub); |
| }; |
| |
| |
| class StoreArrayLiteralElementStub : public CodeStub { |
| public: |
| explicit StoreArrayLiteralElementStub() {} |
| |
| private: |
| Major MajorKey() { return StoreArrayLiteralElement; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| |
| DISALLOW_COPY_AND_ASSIGN(StoreArrayLiteralElementStub); |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_CODE_STUBS_H_ |