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Diffstat (limited to 'V8Binding/v8/src/x64/regexp-macro-assembler-x64.h')
| -rw-r--r-- | V8Binding/v8/src/x64/regexp-macro-assembler-x64.h | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/V8Binding/v8/src/x64/regexp-macro-assembler-x64.h b/V8Binding/v8/src/x64/regexp-macro-assembler-x64.h index 209aa2d..a270bc1 100644 --- a/V8Binding/v8/src/x64/regexp-macro-assembler-x64.h +++ b/V8Binding/v8/src/x64/regexp-macro-assembler-x64.h @@ -25,3 +25,271 @@ // (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_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ +#define V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ + +namespace v8 { +namespace internal { + +class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler { + public: + RegExpMacroAssemblerX64(Mode mode, int registers_to_save); + virtual ~RegExpMacroAssemblerX64(); + virtual int stack_limit_slack(); + virtual void AdvanceCurrentPosition(int by); + virtual void AdvanceRegister(int reg, int by); + virtual void Backtrack(); + virtual void Bind(Label* label); + virtual void CheckAtStart(Label* on_at_start); + virtual void CheckCharacter(uint32_t c, Label* on_equal); + virtual void CheckCharacterAfterAnd(uint32_t c, + uint32_t mask, + Label* on_equal); + virtual void CheckCharacterGT(uc16 limit, Label* on_greater); + virtual void CheckCharacterLT(uc16 limit, Label* on_less); + virtual void CheckCharacters(Vector<const uc16> str, + int cp_offset, + Label* on_failure, + bool check_end_of_string); + // A "greedy loop" is a loop that is both greedy and with a simple + // body. It has a particularly simple implementation. + virtual void CheckGreedyLoop(Label* on_tos_equals_current_position); + virtual void CheckNotAtStart(Label* on_not_at_start); + virtual void CheckNotBackReference(int start_reg, Label* on_no_match); + virtual void CheckNotBackReferenceIgnoreCase(int start_reg, + Label* on_no_match); + virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal); + virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal); + virtual void CheckNotCharacterAfterAnd(uint32_t c, + uint32_t mask, + Label* on_not_equal); + virtual void CheckNotCharacterAfterMinusAnd(uc16 c, + uc16 minus, + uc16 mask, + Label* on_not_equal); + // Checks whether the given offset from the current position is before + // the end of the string. + virtual void CheckPosition(int cp_offset, Label* on_outside_input); + virtual bool CheckSpecialCharacterClass(uc16 type, + int cp_offset, + bool check_offset, + Label* on_no_match); + virtual void Fail(); + virtual Handle<Object> GetCode(Handle<String> source); + virtual void GoTo(Label* label); + virtual void IfRegisterGE(int reg, int comparand, Label* if_ge); + virtual void IfRegisterLT(int reg, int comparand, Label* if_lt); + virtual void IfRegisterEqPos(int reg, Label* if_eq); + virtual IrregexpImplementation Implementation(); + virtual void LoadCurrentCharacter(int cp_offset, + Label* on_end_of_input, + bool check_bounds = true, + int characters = 1); + virtual void PopCurrentPosition(); + virtual void PopRegister(int register_index); + virtual void PushBacktrack(Label* label); + virtual void PushCurrentPosition(); + virtual void PushRegister(int register_index, + StackCheckFlag check_stack_limit); + virtual void ReadCurrentPositionFromRegister(int reg); + virtual void ReadStackPointerFromRegister(int reg); + virtual void SetRegister(int register_index, int to); + virtual void Succeed(); + virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); + virtual void ClearRegisters(int reg_from, int reg_to); + virtual void WriteStackPointerToRegister(int reg); + + static Result Match(Handle<Code> regexp, + Handle<String> subject, + int* offsets_vector, + int offsets_vector_length, + int previous_index); + + static Result Execute(Code* code, + String* input, + int start_offset, + const byte* input_start, + const byte* input_end, + int* output, + bool at_start); + + private: + // Offsets from rbp of function parameters and stored registers. + static const int kFramePointer = 0; + // Above the frame pointer - function parameters and return address. + static const int kReturn_eip = kFramePointer + kPointerSize; + static const int kFrameAlign = kReturn_eip + kPointerSize; + +#ifdef __MSVC__ + // Parameters (first four passed as registers, but with room on stack). + // In Microsoft 64-bit Calling Convention, there is room on the callers + // stack (before the return address) to spill parameter registers. We + // use this space to store the register passed parameters. + static const int kInputString = kFrameAlign; + static const int kStartIndex = kInputString + kPointerSize; + static const int kInputStart = kStartIndex + kPointerSize; + static const int kInputEnd = kInputStart + kPointerSize; + static const int kRegisterOutput = kInputEnd + kPointerSize; + static const int kAtStart = kRegisterOutput + kPointerSize; + static const int kStackHighEnd = kAtStart + kPointerSize; +#else + // In AMD64 ABI Calling Convention, the first six integer parameters + // are passed as registers, and caller must allocate space on the stack + // if it wants them stored. We push the parameters after the frame pointer. + static const int kInputString = kFramePointer - kPointerSize; + static const int kStartIndex = kInputString - kPointerSize; + static const int kInputStart = kStartIndex - kPointerSize; + static const int kInputEnd = kInputStart - kPointerSize; + static const int kRegisterOutput = kInputEnd - kPointerSize; + static const int kAtStart = kRegisterOutput - kPointerSize; + static const int kStackHighEnd = kFrameAlign; +#endif + +#ifdef __MSVC__ + // Microsoft calling convention has three callee-saved registers + // (that we are using). We push these after the frame pointer. + static const int kBackup_rsi = kFramePointer - kPointerSize; + static const int kBackup_rdi = kBackup_rsi - kPointerSize; + static const int kBackup_rbx = kBackup_rdi - kPointerSize; + static const int kLastCalleeSaveRegister = kBackup_rbx; +#else + // AMD64 Calling Convention has only one callee-save register that + // we use. We push this after the frame pointer (and after the + // parameters). + static const int kBackup_rbx = kAtStart - kPointerSize; + static const int kLastCalleeSaveRegister = kBackup_rbx; +#endif + + // When adding local variables remember to push space for them in + // the frame in GetCode. + static const int kInputStartMinusOne = + kLastCalleeSaveRegister - kPointerSize; + + // First register address. Following registers are below it on the stack. + static const int kRegisterZero = kInputStartMinusOne - kPointerSize; + + // Initial size of code buffer. + static const size_t kRegExpCodeSize = 1024; + + // Load a number of characters at the given offset from the + // current position, into the current-character register. + void LoadCurrentCharacterUnchecked(int cp_offset, int character_count); + + // Check whether preemption has been requested. + void CheckPreemption(); + + // Check whether we are exceeding the stack limit on the backtrack stack. + void CheckStackLimit(); + + // Called from RegExp if the stack-guard is triggered. + // If the code object is relocated, the return address is fixed before + // returning. + static int CheckStackGuardState(Address* return_address, + Code* re_code, + Address re_frame); + + // Generate a call to CheckStackGuardState. + void CallCheckStackGuardState(); + + // Called from RegExp if the backtrack stack limit is hit. + // Tries to expand the stack. Returns the new stack-pointer if + // successful, and updates the stack_top address, or returns 0 if unable + // to grow the stack. + // This function must not trigger a garbage collection. + static Address GrowStack(Address stack_pointer, Address* stack_top); + + // The rbp-relative location of a regexp register. + Operand register_location(int register_index); + + // The register containing the current character after LoadCurrentCharacter. + inline Register current_character() { return rdx; } + + // The register containing the backtrack stack top. Provides a meaningful + // name to the register. + inline Register backtrack_stackpointer() { return rcx; } + + // The registers containing a self pointer to this code's Code object. + inline Register code_object_pointer() { return r8; } + + // Byte size of chars in the string to match (decided by the Mode argument) + inline int char_size() { return static_cast<int>(mode_); } + + // Equivalent to a conditional branch to the label, unless the label + // is NULL, in which case it is a conditional Backtrack. + void BranchOrBacktrack(Condition condition, Label* to); + + void MarkPositionForCodeRelativeFixup() { + code_relative_fixup_positions_.Add(masm_->pc_offset()); + } + + void FixupCodeRelativePositions(); + + // Call and return internally in the generated code in a way that + // is GC-safe (i.e., doesn't leave absolute code addresses on the stack) + inline void SafeCall(Label* to); + inline void SafeCallTarget(Label* label); + inline void SafeReturn(); + + // Pushes the value of a register on the backtrack stack. Decrements the + // stack pointer (rcx) by a word size and stores the register's value there. + inline void Push(Register source); + + // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx) + // by a word size and stores the value there. + inline void Push(Immediate value); + + // Pushes the Code object relative offset of a label on the backtrack stack + // (i.e., a backtrack target). Decrements the stack pointer (rcx) + // by a word size and stores the value there. + inline void Push(Label* label); + + // Pops a value from the backtrack stack. Reads the word at the stack pointer + // (rcx) and increments it by a word size. + inline void Pop(Register target); + + // Drops the top value from the backtrack stack without reading it. + // Increments the stack pointer (rcx) by a word size. + inline void Drop(); + + // Before calling a C-function from generated code, align arguments on stack. + // After aligning the frame, arguments must be stored in esp[0], esp[4], + // etc., not pushed. The argument count assumes all arguments are word sized. + // Some compilers/platforms require the stack to be aligned when calling + // C++ code. + // Needs a scratch register to do some arithmetic. This register will be + // trashed. + inline void FrameAlign(int num_arguments); + + // Calls a C function and cleans up the space for arguments allocated + // by FrameAlign. The called function is not allowed to trigger a garbage + // collection, since that might move the code and invalidate the return + // address (unless this is somehow accounted for by the called function). + inline void CallCFunction(Address function_address, int num_arguments); + + MacroAssembler* masm_; + + ZoneList<int> code_relative_fixup_positions_; + + // Which mode to generate code for (ASCII or UC16). + Mode mode_; + + // One greater than maximal register index actually used. + int num_registers_; + + // Number of registers to output at the end (the saved registers + // are always 0..num_saved_registers_-1) + int num_saved_registers_; + + // Labels used internally. + Label entry_label_; + Label start_label_; + Label success_label_; + Label backtrack_label_; + Label exit_label_; + Label check_preempt_label_; + Label stack_overflow_label_; +}; + +}} // namespace v8::internal + +#endif // V8_X64_REGEXP_MACRO_ASSEMBLER_X64_H_ |