1 // Copyright 2014 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.
5 #ifndef V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_
6 #define V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_
8 #include "src/macro-assembler.h"
9 #include "src/ppc/assembler-ppc.h"
10 #include "src/ppc/frames-ppc.h"
11 #include "src/regexp/regexp-macro-assembler.h"
17 #ifndef V8_INTERPRETED_REGEXP
18 class RegExpMacroAssemblerPPC : public NativeRegExpMacroAssembler {
20 RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone, Mode mode,
21 int registers_to_save);
22 virtual ~RegExpMacroAssemblerPPC();
23 virtual int stack_limit_slack();
24 virtual void AdvanceCurrentPosition(int by);
25 virtual void AdvanceRegister(int reg, int by);
26 virtual void Backtrack();
27 virtual void Bind(Label* label);
28 virtual void CheckAtStart(Label* on_at_start);
29 virtual void CheckCharacter(unsigned c, Label* on_equal);
30 virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask,
32 virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
33 virtual void CheckCharacterLT(uc16 limit, Label* on_less);
34 // A "greedy loop" is a loop that is both greedy and with a simple
35 // body. It has a particularly simple implementation.
36 virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
37 virtual void CheckNotAtStart(Label* on_not_at_start);
38 virtual void CheckNotBackReference(int start_reg, Label* on_no_match);
39 virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
41 virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
42 virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask,
44 virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
46 virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range);
47 virtual void CheckCharacterNotInRange(uc16 from, uc16 to,
48 Label* on_not_in_range);
49 virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
51 // Checks whether the given offset from the current position is before
52 // the end of the string.
53 virtual void CheckPosition(int cp_offset, Label* on_outside_input);
54 virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
56 virtual Handle<HeapObject> GetCode(Handle<String> source);
57 virtual void GoTo(Label* label);
58 virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
59 virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
60 virtual void IfRegisterEqPos(int reg, Label* if_eq);
61 virtual IrregexpImplementation Implementation();
62 virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input,
63 bool check_bounds = true,
65 virtual void PopCurrentPosition();
66 virtual void PopRegister(int register_index);
67 virtual void PushBacktrack(Label* label);
68 virtual void PushCurrentPosition();
69 virtual void PushRegister(int register_index,
70 StackCheckFlag check_stack_limit);
71 virtual void ReadCurrentPositionFromRegister(int reg);
72 virtual void ReadStackPointerFromRegister(int reg);
73 virtual void SetCurrentPositionFromEnd(int by);
74 virtual void SetRegister(int register_index, int to);
75 virtual bool Succeed();
76 virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
77 virtual void ClearRegisters(int reg_from, int reg_to);
78 virtual void WriteStackPointerToRegister(int reg);
79 virtual bool CanReadUnaligned();
81 // Called from RegExp if the stack-guard is triggered.
82 // If the code object is relocated, the return address is fixed before
84 static int CheckStackGuardState(Address* return_address, Code* re_code,
88 // Offsets from frame_pointer() of function parameters and stored registers.
89 static const int kFramePointer = 0;
91 // Above the frame pointer - Stored registers and stack passed parameters.
93 static const int kStoredRegisters = kFramePointer;
94 // Return address (stored from link register, read into pc on return).
95 static const int kReturnAddress = kStoredRegisters + 7 * kPointerSize;
96 static const int kCallerFrame = kReturnAddress + kPointerSize;
97 // Stack parameters placed by caller.
98 static const int kSecondaryReturnAddress =
99 kCallerFrame + kStackFrameExtraParamSlot * kPointerSize;
100 static const int kIsolate = kSecondaryReturnAddress + kPointerSize;
102 // Below the frame pointer.
103 // Register parameters stored by setup code.
104 static const int kDirectCall = kFramePointer - kPointerSize;
105 static const int kStackHighEnd = kDirectCall - kPointerSize;
106 static const int kNumOutputRegisters = kStackHighEnd - kPointerSize;
107 static const int kRegisterOutput = kNumOutputRegisters - kPointerSize;
108 static const int kInputEnd = kRegisterOutput - kPointerSize;
109 static const int kInputStart = kInputEnd - kPointerSize;
110 static const int kStartIndex = kInputStart - kPointerSize;
111 static const int kInputString = kStartIndex - kPointerSize;
112 // When adding local variables remember to push space for them in
113 // the frame in GetCode.
114 static const int kSuccessfulCaptures = kInputString - kPointerSize;
115 static const int kInputStartMinusOne = kSuccessfulCaptures - kPointerSize;
116 // First register address. Following registers are below it on the stack.
117 static const int kRegisterZero = kInputStartMinusOne - kPointerSize;
119 // Initial size of code buffer.
120 static const size_t kRegExpCodeSize = 1024;
122 // Load a number of characters at the given offset from the
123 // current position, into the current-character register.
124 void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
126 // Check whether preemption has been requested.
127 void CheckPreemption();
129 // Check whether we are exceeding the stack limit on the backtrack stack.
130 void CheckStackLimit();
133 // Generate a call to CheckStackGuardState.
134 void CallCheckStackGuardState(Register scratch);
136 // The ebp-relative location of a regexp register.
137 MemOperand register_location(int register_index);
139 // Register holding the current input position as negative offset from
140 // the end of the string.
141 inline Register current_input_offset() { return r27; }
143 // The register containing the current character after LoadCurrentCharacter.
144 inline Register current_character() { return r28; }
146 // Register holding address of the end of the input string.
147 inline Register end_of_input_address() { return r30; }
149 // Register holding the frame address. Local variables, parameters and
150 // regexp registers are addressed relative to this.
151 inline Register frame_pointer() { return fp; }
153 // The register containing the backtrack stack top. Provides a meaningful
154 // name to the register.
155 inline Register backtrack_stackpointer() { return r29; }
157 // Register holding pointer to the current code object.
158 inline Register code_pointer() { return r26; }
160 // Byte size of chars in the string to match (decided by the Mode argument)
161 inline int char_size() { return static_cast<int>(mode_); }
163 // Equivalent to a conditional branch to the label, unless the label
164 // is NULL, in which case it is a conditional Backtrack.
165 void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7);
167 // Call and return internally in the generated code in a way that
168 // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
169 inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7);
170 inline void SafeReturn();
171 inline void SafeCallTarget(Label* name);
173 // Pushes the value of a register on the backtrack stack. Decrements the
174 // stack pointer by a word size and stores the register's value there.
175 inline void Push(Register source);
177 // Pops a value from the backtrack stack. Reads the word at the stack pointer
178 // and increments it by a word size.
179 inline void Pop(Register target);
181 Isolate* isolate() const { return masm_->isolate(); }
183 MacroAssembler* masm_;
185 // Which mode to generate code for (Latin1 or UC16).
188 // One greater than maximal register index actually used.
191 // Number of registers to output at the end (the saved registers
192 // are always 0..num_saved_registers_-1)
193 int num_saved_registers_;
195 // Labels used internally.
198 Label success_label_;
199 Label backtrack_label_;
201 Label check_preempt_label_;
202 Label stack_overflow_label_;
203 Label internal_failure_label_;
206 // Set of non-volatile registers saved/restored by generated regexp code.
207 const RegList kRegExpCalleeSaved =
208 1 << 25 | 1 << 26 | 1 << 27 | 1 << 28 | 1 << 29 | 1 << 30 | 1 << 31;
210 #endif // V8_INTERPRETED_REGEXP
212 } // namespace v8::internal
214 #endif // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_