| // 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 |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ |
| #define V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ |
| |
| #include "ia32/assembler-ia32.h" |
| #include "ia32/assembler-ia32-inl.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifndef V8_INTERPRETED_REGEXP |
| class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler { |
| public: |
| RegExpMacroAssemblerIA32(Mode mode, int registers_to_save, Zone* zone); |
| virtual ~RegExpMacroAssemblerIA32(); |
| 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 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); |
| virtual void CheckCharacterInRange(uc16 from, |
| uc16 to, |
| Label* on_in_range); |
| virtual void CheckCharacterNotInRange(uc16 from, |
| uc16 to, |
| Label* on_not_in_range); |
| virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set); |
| |
| // 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, Label* on_no_match); |
| virtual void Fail(); |
| virtual Handle<HeapObject> 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 SetCurrentPositionFromEnd(int by); |
| virtual void SetRegister(int register_index, int to); |
| virtual bool Succeed(); |
| virtual void WriteCurrentPositionToRegister(int reg, int cp_offset); |
| virtual void ClearRegisters(int reg_from, int reg_to); |
| virtual void WriteStackPointerToRegister(int reg); |
| |
| // 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); |
| |
| private: |
| // Offsets from ebp 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; |
| // 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; |
| // For the case of global regular expression, we have room to store at least |
| // one set of capture results. For the case of non-global regexp, we ignore |
| // this value. |
| static const int kNumOutputRegisters = kRegisterOutput + kPointerSize; |
| static const int kStackHighEnd = kNumOutputRegisters + kPointerSize; |
| static const int kDirectCall = kStackHighEnd + kPointerSize; |
| static const int kIsolate = kDirectCall + kPointerSize; |
| // Below the frame pointer - local stack variables. |
| // When adding local variables remember to push space for them in |
| // the frame in GetCode. |
| static const int kBackup_esi = kFramePointer - kPointerSize; |
| static const int kBackup_edi = kBackup_esi - kPointerSize; |
| static const int kBackup_ebx = kBackup_edi - kPointerSize; |
| static const int kSuccessfulCaptures = kBackup_ebx - kPointerSize; |
| static const int kInputStartMinusOne = kSuccessfulCaptures - 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(); |
| |
| // Generate a call to CheckStackGuardState. |
| void CallCheckStackGuardState(Register scratch); |
| |
| // The ebp-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 edx; } |
| |
| // The register containing the backtrack stack top. Provides a meaningful |
| // name to the register. |
| inline Register backtrack_stackpointer() { return ecx; } |
| |
| // 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); |
| |
| // 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 SafeReturn(); |
| inline void SafeCallTarget(Label* name); |
| |
| // Pushes the value of a register on the backtrack stack. Decrements the |
| // stack pointer (ecx) 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 (ecx) |
| // by a word size and stores the value there. |
| inline void Push(Immediate value); |
| |
| // Pops a value from the backtrack stack. Reads the word at the stack pointer |
| // (ecx) and increments it by a word size. |
| inline void Pop(Register target); |
| |
| MacroAssembler* masm_; |
| |
| // 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_; |
| }; |
| #endif // V8_INTERPRETED_REGEXP |
| |
| }} // namespace v8::internal |
| |
| #endif // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ |