| // Copyright 2006-2008 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 "globals.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // List of code stubs used on all platforms. The order in this list is important |
| // as only the stubs up to and including RecordWrite allows nested stub calls. |
| #define CODE_STUB_LIST_ALL_PLATFORMS(V) \ |
| V(CallFunction) \ |
| V(GenericBinaryOp) \ |
| V(TypeRecordingBinaryOp) \ |
| V(StringAdd) \ |
| V(StringCharAt) \ |
| V(SubString) \ |
| V(StringCompare) \ |
| V(SmiOp) \ |
| V(Compare) \ |
| V(CompareIC) \ |
| V(MathPow) \ |
| V(TranscendentalCache) \ |
| V(RecordWrite) \ |
| V(ConvertToDouble) \ |
| V(WriteInt32ToHeapNumber) \ |
| V(IntegerMod) \ |
| V(StackCheck) \ |
| V(FastNewClosure) \ |
| V(FastNewContext) \ |
| V(FastCloneShallowArray) \ |
| V(GenericUnaryOp) \ |
| V(RevertToNumber) \ |
| V(ToBoolean) \ |
| V(Instanceof) \ |
| V(CounterOp) \ |
| V(ArgumentsAccess) \ |
| V(RegExpExec) \ |
| V(RegExpConstructResult) \ |
| V(NumberToString) \ |
| V(CEntry) \ |
| V(JSEntry) \ |
| V(DebuggerStatement) |
| |
| // 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) |
| #else |
| #define CODE_STUB_LIST_ARM(V) |
| #endif |
| |
| // Combined list of code stubs. |
| #define CODE_STUB_LIST(V) \ |
| CODE_STUB_LIST_ALL_PLATFORMS(V) \ |
| CODE_STUB_LIST_ARM(V) |
| |
| // Types of uncatchable exceptions. |
| enum UncatchableExceptionType { OUT_OF_MEMORY, TERMINATION }; |
| |
| // 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(); |
| |
| // Retrieve the code for the stub if already generated. Do not |
| // generate the code if not already generated and instead return a |
| // retry after GC Failure object. |
| MUST_USE_RESULT MaybeObject* TryGetCode(); |
| |
| 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() {} |
| |
| protected: |
| static const int kMajorBits = 6; |
| static const int kMinorBits = kBitsPerInt - kSmiTagSize - kMajorBits; |
| |
| private: |
| // Lookup the code in the (possibly custom) cache. |
| bool FindCodeInCache(Code** code_out); |
| |
| // 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(Code* code) { } |
| |
| // Returns information for computing the number key. |
| virtual Major MajorKey() = 0; |
| virtual int MinorKey() = 0; |
| |
| // The CallFunctionStub needs to override this so it can encode whether a |
| // lazily generated function should be fully optimized or not. |
| virtual InLoopFlag InLoop() { return NOT_IN_LOOP; } |
| |
| // GenericBinaryOpStub needs to override this. |
| virtual int GetCodeKind(); |
| |
| // GenericBinaryOpStub needs to override this. |
| virtual InlineCacheState GetICState() { |
| return UNINITIALIZED; |
| } |
| |
| // Returns a name for logging/debugging purposes. |
| virtual const char* GetName() { return MajorName(MajorKey(), false); } |
| |
| #ifdef DEBUG |
| virtual void Print() { PrintF("%s\n", GetName()); } |
| #endif |
| |
| // 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()); |
| } |
| |
| bool AllowsStubCalls() { return MajorKey() <= RecordWrite; } |
| |
| 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: |
| |
| const char* GetName() { return "StackCheckStub"; } |
| |
| Major MajorKey() { return StackCheck; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| class FastNewClosureStub : public CodeStub { |
| public: |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| const char* GetName() { return "FastNewClosureStub"; } |
| Major MajorKey() { return FastNewClosure; } |
| int MinorKey() { return 0; } |
| }; |
| |
| |
| 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_; |
| |
| const char* GetName() { return "FastNewContextStub"; } |
| Major MajorKey() { return FastNewContext; } |
| int MinorKey() { return slots_; } |
| }; |
| |
| |
| class FastCloneShallowArrayStub : public CodeStub { |
| public: |
| // Maximum length of copied elements array. |
| static const int kMaximumClonedLength = 8; |
| |
| enum Mode { |
| CLONE_ELEMENTS, |
| COPY_ON_WRITE_ELEMENTS |
| }; |
| |
| FastCloneShallowArrayStub(Mode mode, int length) |
| : mode_(mode), |
| length_((mode == COPY_ON_WRITE_ELEMENTS) ? 0 : length) { |
| ASSERT(length_ >= 0); |
| ASSERT(length_ <= kMaximumClonedLength); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Mode mode_; |
| int length_; |
| |
| const char* GetName() { return "FastCloneShallowArrayStub"; } |
| Major MajorKey() { return FastCloneShallowArray; } |
| int MinorKey() { |
| ASSERT(mode_ == 0 || mode_ == 1); |
| return (length_ << 1) | mode_; |
| } |
| }; |
| |
| |
| class InstanceofStub: public CodeStub { |
| public: |
| enum Flags { |
| kNoFlags = 0, |
| kArgsInRegisters = 1 << 0 |
| }; |
| |
| explicit InstanceofStub(Flags flags) : flags_(flags) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| Major MajorKey() { return Instanceof; } |
| int MinorKey() { return args_in_registers() ? 1 : 0; } |
| |
| bool args_in_registers() { |
| return (flags_ & kArgsInRegisters) != 0; |
| } |
| |
| Flags flags_; |
| }; |
| |
| |
| enum NegativeZeroHandling { |
| kStrictNegativeZero, |
| kIgnoreNegativeZero |
| }; |
| |
| |
| enum UnaryOpFlags { |
| NO_UNARY_FLAGS = 0, |
| NO_UNARY_SMI_CODE_IN_STUB = 1 << 0 |
| }; |
| |
| |
| class GenericUnaryOpStub : public CodeStub { |
| public: |
| GenericUnaryOpStub(Token::Value op, |
| UnaryOverwriteMode overwrite, |
| UnaryOpFlags flags, |
| NegativeZeroHandling negative_zero = kStrictNegativeZero) |
| : op_(op), |
| overwrite_(overwrite), |
| include_smi_code_((flags & NO_UNARY_SMI_CODE_IN_STUB) == 0), |
| negative_zero_(negative_zero) { } |
| |
| private: |
| Token::Value op_; |
| UnaryOverwriteMode overwrite_; |
| bool include_smi_code_; |
| NegativeZeroHandling negative_zero_; |
| |
| class OverwriteField: public BitField<UnaryOverwriteMode, 0, 1> {}; |
| class IncludeSmiCodeField: public BitField<bool, 1, 1> {}; |
| class NegativeZeroField: public BitField<NegativeZeroHandling, 2, 1> {}; |
| class OpField: public BitField<Token::Value, 3, kMinorBits - 3> {}; |
| |
| Major MajorKey() { return GenericUnaryOp; } |
| int MinorKey() { |
| return OpField::encode(op_) | |
| OverwriteField::encode(overwrite_) | |
| IncludeSmiCodeField::encode(include_smi_code_) | |
| NegativeZeroField::encode(negative_zero_); |
| } |
| |
| void Generate(MacroAssembler* masm); |
| |
| const char* GetName(); |
| }; |
| |
| |
| class MathPowStub: public CodeStub { |
| public: |
| MathPowStub() {} |
| virtual void Generate(MacroAssembler* masm); |
| |
| private: |
| virtual CodeStub::Major MajorKey() { return MathPow; } |
| virtual int MinorKey() { return 0; } |
| |
| const char* GetName() { return "MathPowStub"; } |
| }; |
| |
| |
| class StringCharAtStub: public CodeStub { |
| public: |
| StringCharAtStub() {} |
| |
| private: |
| Major MajorKey() { return StringCharAt; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| }; |
| |
| |
| 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); |
| |
| private: |
| class OpField: public BitField<int, 0, 3> { }; |
| class StateField: public BitField<int, 3, 5> { }; |
| |
| virtual void FinishCode(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 GenerateObjects(MacroAssembler* masm); |
| void GenerateMiss(MacroAssembler* masm); |
| |
| bool strict() const { return op_ == Token::EQ_STRICT; } |
| Condition GetCondition() const { return CompareIC::ComputeCondition(op_); } |
| |
| Token::Value op_; |
| CompareIC::State state_; |
| }; |
| |
| |
| // 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), |
| name_(NULL) { } |
| |
| 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), |
| name_(NULL) { } |
| |
| 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(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. |
| char* name_; |
| const char* GetName(); |
| #ifdef DEBUG |
| void Print() { |
| PrintF("CompareStub (minor %d) (cc %d), (strict %s), " |
| "(never_nan_nan %s), (smi_compare %s) (number_compare %s) ", |
| MinorKey(), |
| static_cast<int>(cc_), |
| strict_ ? "true" : "false", |
| never_nan_nan_ ? "true" : "false", |
| include_smi_compare_ ? "inluded" : "not included", |
| include_number_compare_ ? "included" : "not included"); |
| |
| if (!lhs_.is(no_reg) && !rhs_.is(no_reg)) { |
| PrintF("(lhs r%d), (rhs r%d)\n", lhs_.code(), rhs_.code()); |
| } else { |
| PrintF("\n"); |
| } |
| } |
| #endif |
| }; |
| |
| |
| class CEntryStub : public CodeStub { |
| public: |
| explicit CEntryStub(int result_size) |
| : result_size_(result_size), save_doubles_(false) { } |
| |
| void Generate(MacroAssembler* masm); |
| void SaveDoubles() { save_doubles_ = true; } |
| |
| 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, |
| int alignment_skew = 0); |
| void GenerateThrowTOS(MacroAssembler* masm); |
| void GenerateThrowUncatchable(MacroAssembler* masm, |
| UncatchableExceptionType type); |
| |
| // Number of pointers/values returned. |
| const int result_size_; |
| bool save_doubles_; |
| |
| Major MajorKey() { return CEntry; } |
| int MinorKey(); |
| |
| const char* GetName() { return "CEntryStub"; } |
| }; |
| |
| |
| 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; } |
| |
| const char* GetName() { return "JSEntryStub"; } |
| }; |
| |
| |
| class JSConstructEntryStub : public JSEntryStub { |
| public: |
| JSConstructEntryStub() { } |
| |
| void Generate(MacroAssembler* masm) { GenerateBody(masm, true); } |
| |
| private: |
| int MinorKey() { return 1; } |
| |
| const char* GetName() { return "JSConstructEntryStub"; } |
| }; |
| |
| |
| class ArgumentsAccessStub: public CodeStub { |
| public: |
| enum Type { |
| READ_ELEMENT, |
| NEW_OBJECT |
| }; |
| |
| 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 GenerateNewObject(MacroAssembler* masm); |
| |
| const char* GetName() { return "ArgumentsAccessStub"; } |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("ArgumentsAccessStub (type %d)\n", type_); |
| } |
| #endif |
| }; |
| |
| |
| class RegExpExecStub: public CodeStub { |
| public: |
| RegExpExecStub() { } |
| |
| private: |
| Major MajorKey() { return RegExpExec; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| |
| const char* GetName() { return "RegExpExecStub"; } |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("RegExpExecStub\n"); |
| } |
| #endif |
| }; |
| |
| |
| class RegExpConstructResultStub: public CodeStub { |
| public: |
| RegExpConstructResultStub() { } |
| |
| private: |
| Major MajorKey() { return RegExpConstructResult; } |
| int MinorKey() { return 0; } |
| |
| void Generate(MacroAssembler* masm); |
| |
| const char* GetName() { return "RegExpConstructResultStub"; } |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("RegExpConstructResultStub\n"); |
| } |
| #endif |
| }; |
| |
| |
| class CallFunctionStub: public CodeStub { |
| public: |
| CallFunctionStub(int argc, InLoopFlag in_loop, CallFunctionFlags flags) |
| : argc_(argc), in_loop_(in_loop), flags_(flags) { } |
| |
| void Generate(MacroAssembler* masm); |
| |
| private: |
| int argc_; |
| InLoopFlag in_loop_; |
| CallFunctionFlags flags_; |
| |
| #ifdef DEBUG |
| void Print() { |
| PrintF("CallFunctionStub (args %d, in_loop %d, flags %d)\n", |
| argc_, |
| static_cast<int>(in_loop_), |
| static_cast<int>(flags_)); |
| } |
| #endif |
| |
| // Minor key encoding in 32 bits with Bitfield <Type, shift, size>. |
| class InLoopBits: public BitField<InLoopFlag, 0, 1> {}; |
| class FlagBits: public BitField<CallFunctionFlags, 1, 1> {}; |
| class ArgcBits: public BitField<int, 2, 32 - 2> {}; |
| |
| Major MajorKey() { return CallFunction; } |
| int MinorKey() { |
| // Encode the parameters in a unique 32 bit value. |
| return InLoopBits::encode(in_loop_) |
| | FlagBits::encode(flags_) |
| | ArgcBits::encode(argc_); |
| } |
| |
| InLoopFlag InLoop() { return in_loop_; } |
| bool ReceiverMightBeValue() { |
| return (flags_ & RECEIVER_MIGHT_BE_VALUE) != 0; |
| } |
| |
| public: |
| static int ExtractArgcFromMinorKey(int minor_key) { |
| return ArgcBits::decode(minor_key); |
| } |
| }; |
| |
| |
| 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 scratch, |
| Register result, |
| Label* receiver_not_string, |
| Label* index_not_number, |
| Label* index_out_of_range, |
| StringIndexFlags index_flags) |
| : object_(object), |
| index_(index), |
| scratch_(scratch), |
| 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(!scratch_.is(object_)); |
| ASSERT(!scratch_.is(index_)); |
| ASSERT(!scratch_.is(result_)); |
| 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 scratch_; |
| 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 scratch1, |
| Register scratch2, |
| Register result, |
| Label* receiver_not_string, |
| Label* index_not_number, |
| Label* index_out_of_range, |
| StringIndexFlags index_flags) |
| : char_code_at_generator_(object, |
| index, |
| scratch1, |
| scratch2, |
| receiver_not_string, |
| index_not_number, |
| index_out_of_range, |
| index_flags), |
| char_from_code_generator_(scratch2, 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); |
| }; |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_CODE_STUBS_H_ |