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1 // Copyright 2008-2009 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 //     * Redistributions of source code must retain the above copyright
7 //       notice, this list of conditions and the following disclaimer.
8 //     * Redistributions in binary form must reproduce the above
9 //       copyright notice, this list of conditions and the following
10 //       disclaimer in the documentation and/or other materials provided
11 //       with the distribution.
12 //     * Neither the name of Google Inc. nor the names of its
13 //       contributors may be used to endorse or promote products derived
14 //       from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
28 #ifndef V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
29 #define V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
30 
31 #include "ia32/assembler-ia32.h"
32 #include "ia32/assembler-ia32-inl.h"
33 
34 namespace v8 {
35 namespace internal {
36 
37 #ifdef V8_INTERPRETED_REGEXP
38 class RegExpMacroAssemblerIA32: public RegExpMacroAssembler {
39  public:
RegExpMacroAssemblerIA32()40   RegExpMacroAssemblerIA32() { }
~RegExpMacroAssemblerIA32()41   virtual ~RegExpMacroAssemblerIA32() { }
42 };
43 
44 #else  // V8_INTERPRETED_REGEXP
45 class RegExpMacroAssemblerIA32: public NativeRegExpMacroAssembler {
46  public:
47   RegExpMacroAssemblerIA32(Mode mode, int registers_to_save);
48   virtual ~RegExpMacroAssemblerIA32();
49   virtual int stack_limit_slack();
50   virtual void AdvanceCurrentPosition(int by);
51   virtual void AdvanceRegister(int reg, int by);
52   virtual void Backtrack();
53   virtual void Bind(Label* label);
54   virtual void CheckAtStart(Label* on_at_start);
55   virtual void CheckCharacter(uint32_t c, Label* on_equal);
56   virtual void CheckCharacterAfterAnd(uint32_t c,
57                                       uint32_t mask,
58                                       Label* on_equal);
59   virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
60   virtual void CheckCharacterLT(uc16 limit, Label* on_less);
61   virtual void CheckCharacters(Vector<const uc16> str,
62                                int cp_offset,
63                                Label* on_failure,
64                                bool check_end_of_string);
65   // A "greedy loop" is a loop that is both greedy and with a simple
66   // body. It has a particularly simple implementation.
67   virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
68   virtual void CheckNotAtStart(Label* on_not_at_start);
69   virtual void CheckNotBackReference(int start_reg, Label* on_no_match);
70   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
71                                                Label* on_no_match);
72   virtual void CheckNotRegistersEqual(int reg1, int reg2, Label* on_not_equal);
73   virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal);
74   virtual void CheckNotCharacterAfterAnd(uint32_t c,
75                                          uint32_t mask,
76                                          Label* on_not_equal);
77   virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
78                                               uc16 minus,
79                                               uc16 mask,
80                                               Label* on_not_equal);
81   // Checks whether the given offset from the current position is before
82   // the end of the string.
83   virtual void CheckPosition(int cp_offset, Label* on_outside_input);
84   virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
85   virtual void Fail();
86   virtual Handle<HeapObject> GetCode(Handle<String> source);
87   virtual void GoTo(Label* label);
88   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
89   virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
90   virtual void IfRegisterEqPos(int reg, Label* if_eq);
91   virtual IrregexpImplementation Implementation();
92   virtual void LoadCurrentCharacter(int cp_offset,
93                                     Label* on_end_of_input,
94                                     bool check_bounds = true,
95                                     int characters = 1);
96   virtual void PopCurrentPosition();
97   virtual void PopRegister(int register_index);
98   virtual void PushBacktrack(Label* label);
99   virtual void PushCurrentPosition();
100   virtual void PushRegister(int register_index,
101                             StackCheckFlag check_stack_limit);
102   virtual void ReadCurrentPositionFromRegister(int reg);
103   virtual void ReadStackPointerFromRegister(int reg);
104   virtual void SetCurrentPositionFromEnd(int by);
105   virtual void SetRegister(int register_index, int to);
106   virtual void Succeed();
107   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
108   virtual void ClearRegisters(int reg_from, int reg_to);
109   virtual void WriteStackPointerToRegister(int reg);
110 
111   // Called from RegExp if the stack-guard is triggered.
112   // If the code object is relocated, the return address is fixed before
113   // returning.
114   static int CheckStackGuardState(Address* return_address,
115                                   Code* re_code,
116                                   Address re_frame);
117 
118  private:
119   // Offsets from ebp of function parameters and stored registers.
120   static const int kFramePointer = 0;
121   // Above the frame pointer - function parameters and return address.
122   static const int kReturn_eip = kFramePointer + kPointerSize;
123   static const int kFrameAlign = kReturn_eip + kPointerSize;
124   // Parameters.
125   static const int kInputString = kFrameAlign;
126   static const int kStartIndex = kInputString + kPointerSize;
127   static const int kInputStart = kStartIndex + kPointerSize;
128   static const int kInputEnd = kInputStart + kPointerSize;
129   static const int kRegisterOutput = kInputEnd + kPointerSize;
130   static const int kStackHighEnd = kRegisterOutput + kPointerSize;
131   static const int kDirectCall = kStackHighEnd + kPointerSize;
132   static const int kIsolate = kDirectCall + kPointerSize;
133   // Below the frame pointer - local stack variables.
134   // When adding local variables remember to push space for them in
135   // the frame in GetCode.
136   static const int kBackup_esi = kFramePointer - kPointerSize;
137   static const int kBackup_edi = kBackup_esi - kPointerSize;
138   static const int kBackup_ebx = kBackup_edi - kPointerSize;
139   static const int kInputStartMinusOne = kBackup_ebx - kPointerSize;
140   // First register address. Following registers are below it on the stack.
141   static const int kRegisterZero = kInputStartMinusOne - kPointerSize;
142 
143   // Initial size of code buffer.
144   static const size_t kRegExpCodeSize = 1024;
145 
146   // Load a number of characters at the given offset from the
147   // current position, into the current-character register.
148   void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
149 
150   // Check whether preemption has been requested.
151   void CheckPreemption();
152 
153   // Check whether we are exceeding the stack limit on the backtrack stack.
154   void CheckStackLimit();
155 
156   // Generate a call to CheckStackGuardState.
157   void CallCheckStackGuardState(Register scratch);
158 
159   // The ebp-relative location of a regexp register.
160   Operand register_location(int register_index);
161 
162   // The register containing the current character after LoadCurrentCharacter.
163   inline Register current_character() { return edx; }
164 
165   // The register containing the backtrack stack top. Provides a meaningful
166   // name to the register.
167   inline Register backtrack_stackpointer() { return ecx; }
168 
169   // Byte size of chars in the string to match (decided by the Mode argument)
170   inline int char_size() { return static_cast<int>(mode_); }
171 
172   // Equivalent to a conditional branch to the label, unless the label
173   // is NULL, in which case it is a conditional Backtrack.
174   void BranchOrBacktrack(Condition condition, Label* to);
175 
176   // Call and return internally in the generated code in a way that
177   // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
178   inline void SafeCall(Label* to);
179   inline void SafeReturn();
180   inline void SafeCallTarget(Label* name);
181 
182   // Pushes the value of a register on the backtrack stack. Decrements the
183   // stack pointer (ecx) by a word size and stores the register's value there.
184   inline void Push(Register source);
185 
186   // Pushes a value on the backtrack stack. Decrements the stack pointer (ecx)
187   // by a word size and stores the value there.
188   inline void Push(Immediate value);
189 
190   // Pops a value from the backtrack stack. Reads the word at the stack pointer
191   // (ecx) and increments it by a word size.
192   inline void Pop(Register target);
193 
194   MacroAssembler* masm_;
195 
196   // Which mode to generate code for (ASCII or UC16).
197   Mode mode_;
198 
199   // One greater than maximal register index actually used.
200   int num_registers_;
201 
202   // Number of registers to output at the end (the saved registers
203   // are always 0..num_saved_registers_-1)
204   int num_saved_registers_;
205 
206   // Labels used internally.
207   Label entry_label_;
208   Label start_label_;
209   Label success_label_;
210   Label backtrack_label_;
211   Label exit_label_;
212   Label check_preempt_label_;
213   Label stack_overflow_label_;
214 };
215 #endif  // V8_INTERPRETED_REGEXP
216 
217 }}  // namespace v8::internal
218 
219 #endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
220