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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
      6 #define V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
      7 
      8 #include "src/ia32/assembler-ia32.h"
      9 #include "src/macro-assembler.h"
     10 #include "src/regexp/regexp-macro-assembler.h"
     11 
     12 namespace v8 {
     13 namespace internal {
     14 
     15 #ifndef V8_INTERPRETED_REGEXP
     16 class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler {
     17  public:
     18   RegExpMacroAssemblerIA32(Isolate* isolate, Zone* zone, Mode mode,
     19                            int registers_to_save);
     20   virtual ~RegExpMacroAssemblerIA32();
     21   virtual int stack_limit_slack();
     22   virtual void AdvanceCurrentPosition(int by);
     23   virtual void AdvanceRegister(int reg, int by);
     24   virtual void Backtrack();
     25   virtual void Bind(Label* label);
     26   virtual void CheckAtStart(Label* on_at_start);
     27   virtual void CheckCharacter(uint32_t c, Label* on_equal);
     28   virtual void CheckCharacterAfterAnd(uint32_t c,
     29                                       uint32_t mask,
     30                                       Label* on_equal);
     31   virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
     32   virtual void CheckCharacterLT(uc16 limit, Label* on_less);
     33   // A "greedy loop" is a loop that is both greedy and with a simple
     34   // body. It has a particularly simple implementation.
     35   virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
     36   virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
     37   virtual void CheckNotBackReference(int start_reg, bool read_backward,
     38                                      Label* on_no_match);
     39   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
     40                                                bool read_backward,
     41                                                Label* on_no_match);
     42   virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal);
     43   virtual void CheckNotCharacterAfterAnd(uint32_t c,
     44                                          uint32_t mask,
     45                                          Label* on_not_equal);
     46   virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
     47                                               uc16 minus,
     48                                               uc16 mask,
     49                                               Label* on_not_equal);
     50   virtual void CheckCharacterInRange(uc16 from,
     51                                      uc16 to,
     52                                      Label* on_in_range);
     53   virtual void CheckCharacterNotInRange(uc16 from,
     54                                         uc16 to,
     55                                         Label* on_not_in_range);
     56   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
     57 
     58   // Checks whether the given offset from the current position is before
     59   // the end of the string.
     60   virtual void CheckPosition(int cp_offset, Label* on_outside_input);
     61   virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
     62   virtual void Fail();
     63   virtual Handle<HeapObject> GetCode(Handle<String> source);
     64   virtual void GoTo(Label* label);
     65   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
     66   virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
     67   virtual void IfRegisterEqPos(int reg, Label* if_eq);
     68   virtual IrregexpImplementation Implementation();
     69   virtual void LoadCurrentCharacter(int cp_offset,
     70                                     Label* on_end_of_input,
     71                                     bool check_bounds = true,
     72                                     int characters = 1);
     73   virtual void PopCurrentPosition();
     74   virtual void PopRegister(int register_index);
     75   virtual void PushBacktrack(Label* label);
     76   virtual void PushCurrentPosition();
     77   virtual void PushRegister(int register_index,
     78                             StackCheckFlag check_stack_limit);
     79   virtual void ReadCurrentPositionFromRegister(int reg);
     80   virtual void ReadStackPointerFromRegister(int reg);
     81   virtual void SetCurrentPositionFromEnd(int by);
     82   virtual void SetRegister(int register_index, int to);
     83   virtual bool Succeed();
     84   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
     85   virtual void ClearRegisters(int reg_from, int reg_to);
     86   virtual void WriteStackPointerToRegister(int reg);
     87 
     88   // Called from RegExp if the stack-guard is triggered.
     89   // If the code object is relocated, the return address is fixed before
     90   // returning.
     91   static int CheckStackGuardState(Address* return_address,
     92                                   Code* re_code,
     93                                   Address re_frame);
     94 
     95  private:
     96   // Offsets from ebp of function parameters and stored registers.
     97   static const int kFramePointer = 0;
     98   // Above the frame pointer - function parameters and return address.
     99   static const int kReturn_eip = kFramePointer + kPointerSize;
    100   static const int kFrameAlign = kReturn_eip + kPointerSize;
    101   // Parameters.
    102   static const int kInputString = kFrameAlign;
    103   static const int kStartIndex = kInputString + kPointerSize;
    104   static const int kInputStart = kStartIndex + kPointerSize;
    105   static const int kInputEnd = kInputStart + kPointerSize;
    106   static const int kRegisterOutput = kInputEnd + kPointerSize;
    107   // For the case of global regular expression, we have room to store at least
    108   // one set of capture results.  For the case of non-global regexp, we ignore
    109   // this value.
    110   static const int kNumOutputRegisters = kRegisterOutput + kPointerSize;
    111   static const int kStackHighEnd = kNumOutputRegisters + kPointerSize;
    112   static const int kDirectCall = kStackHighEnd + kPointerSize;
    113   static const int kIsolate = kDirectCall + kPointerSize;
    114   // Below the frame pointer - local stack variables.
    115   // When adding local variables remember to push space for them in
    116   // the frame in GetCode.
    117   static const int kBackup_esi = kFramePointer - kPointerSize;
    118   static const int kBackup_edi = kBackup_esi - kPointerSize;
    119   static const int kBackup_ebx = kBackup_edi - kPointerSize;
    120   static const int kSuccessfulCaptures = kBackup_ebx - kPointerSize;
    121   static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
    122   // First register address. Following registers are below it on the stack.
    123   static const int kRegisterZero = kStringStartMinusOne - kPointerSize;
    124 
    125   // Initial size of code buffer.
    126   static const size_t kRegExpCodeSize = 1024;
    127 
    128   // Load a number of characters at the given offset from the
    129   // current position, into the current-character register.
    130   void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
    131 
    132   // Check whether preemption has been requested.
    133   void CheckPreemption();
    134 
    135   // Check whether we are exceeding the stack limit on the backtrack stack.
    136   void CheckStackLimit();
    137 
    138   // Generate a call to CheckStackGuardState.
    139   void CallCheckStackGuardState(Register scratch);
    140 
    141   // The ebp-relative location of a regexp register.
    142   Operand register_location(int register_index);
    143 
    144   // The register containing the current character after LoadCurrentCharacter.
    145   inline Register current_character() { return edx; }
    146 
    147   // The register containing the backtrack stack top. Provides a meaningful
    148   // name to the register.
    149   inline Register backtrack_stackpointer() { return ecx; }
    150 
    151   // Byte size of chars in the string to match (decided by the Mode argument)
    152   inline int char_size() { return static_cast<int>(mode_); }
    153 
    154   // Equivalent to a conditional branch to the label, unless the label
    155   // is NULL, in which case it is a conditional Backtrack.
    156   void BranchOrBacktrack(Condition condition, Label* to);
    157 
    158   // Call and return internally in the generated code in a way that
    159   // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
    160   inline void SafeCall(Label* to);
    161   inline void SafeReturn();
    162   inline void SafeCallTarget(Label* name);
    163 
    164   // Pushes the value of a register on the backtrack stack. Decrements the
    165   // stack pointer (ecx) by a word size and stores the register's value there.
    166   inline void Push(Register source);
    167 
    168   // Pushes a value on the backtrack stack. Decrements the stack pointer (ecx)
    169   // by a word size and stores the value there.
    170   inline void Push(Immediate value);
    171 
    172   // Pops a value from the backtrack stack. Reads the word at the stack pointer
    173   // (ecx) and increments it by a word size.
    174   inline void Pop(Register target);
    175 
    176   Isolate* isolate() const { return masm_->isolate(); }
    177 
    178   MacroAssembler* masm_;
    179 
    180   // Which mode to generate code for (LATIN1 or UC16).
    181   Mode mode_;
    182 
    183   // One greater than maximal register index actually used.
    184   int num_registers_;
    185 
    186   // Number of registers to output at the end (the saved registers
    187   // are always 0..num_saved_registers_-1)
    188   int num_saved_registers_;
    189 
    190   // Labels used internally.
    191   Label entry_label_;
    192   Label start_label_;
    193   Label success_label_;
    194   Label backtrack_label_;
    195   Label exit_label_;
    196   Label check_preempt_label_;
    197   Label stack_overflow_label_;
    198 };
    199 #endif  // V8_INTERPRETED_REGEXP
    200 
    201 }  // namespace internal
    202 }  // namespace v8
    203 
    204 #endif  // V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
    205