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.
4
5#ifndef V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_
6#define V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_
7
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"
12
13namespace v8 {
14namespace internal {
15
16
17#ifndef V8_INTERPRETED_REGEXP
18class RegExpMacroAssemblerPPC : public NativeRegExpMacroAssembler {
19 public:
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,
31                                      Label* on_equal);
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(int cp_offset, Label* on_not_at_start);
38  virtual void CheckNotBackReference(int start_reg, bool read_backward,
39                                     Label* on_no_match);
40  virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
41                                               bool read_backward, bool unicode,
42                                               Label* on_no_match);
43  virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
44  virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask,
45                                         Label* on_not_equal);
46  virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
47                                              Label* on_not_equal);
48  virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range);
49  virtual void CheckCharacterNotInRange(uc16 from, uc16 to,
50                                        Label* on_not_in_range);
51  virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
52
53  // Checks whether the given offset from the current position is before
54  // the end of the string.
55  virtual void CheckPosition(int cp_offset, Label* on_outside_input);
56  virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
57  virtual void Fail();
58  virtual Handle<HeapObject> GetCode(Handle<String> source);
59  virtual void GoTo(Label* label);
60  virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
61  virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
62  virtual void IfRegisterEqPos(int reg, Label* if_eq);
63  virtual IrregexpImplementation Implementation();
64  virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input,
65                                    bool check_bounds = true,
66                                    int characters = 1);
67  virtual void PopCurrentPosition();
68  virtual void PopRegister(int register_index);
69  virtual void PushBacktrack(Label* label);
70  virtual void PushCurrentPosition();
71  virtual void PushRegister(int register_index,
72                            StackCheckFlag check_stack_limit);
73  virtual void ReadCurrentPositionFromRegister(int reg);
74  virtual void ReadStackPointerFromRegister(int reg);
75  virtual void SetCurrentPositionFromEnd(int by);
76  virtual void SetRegister(int register_index, int to);
77  virtual bool Succeed();
78  virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
79  virtual void ClearRegisters(int reg_from, int reg_to);
80  virtual void WriteStackPointerToRegister(int reg);
81  virtual bool CanReadUnaligned();
82
83  // Called from RegExp if the stack-guard is triggered.
84  // If the code object is relocated, the return address is fixed before
85  // returning.
86  static int CheckStackGuardState(Address* return_address, Code* re_code,
87                                  Address re_frame);
88
89 private:
90  // Offsets from frame_pointer() of function parameters and stored registers.
91  static const int kFramePointer = 0;
92
93  // Above the frame pointer - Stored registers and stack passed parameters.
94  // Register 25..31.
95  static const int kStoredRegisters = kFramePointer;
96  // Return address (stored from link register, read into pc on return).
97  static const int kReturnAddress = kStoredRegisters + 7 * kPointerSize;
98  static const int kCallerFrame = kReturnAddress + kPointerSize;
99  // Stack parameters placed by caller.
100  static const int kSecondaryReturnAddress =
101      kCallerFrame + kStackFrameExtraParamSlot * kPointerSize;
102  static const int kIsolate = kSecondaryReturnAddress + kPointerSize;
103
104  // Below the frame pointer.
105  // Register parameters stored by setup code.
106  static const int kDirectCall = kFramePointer - kPointerSize;
107  static const int kStackHighEnd = kDirectCall - kPointerSize;
108  static const int kNumOutputRegisters = kStackHighEnd - kPointerSize;
109  static const int kRegisterOutput = kNumOutputRegisters - kPointerSize;
110  static const int kInputEnd = kRegisterOutput - kPointerSize;
111  static const int kInputStart = kInputEnd - kPointerSize;
112  static const int kStartIndex = kInputStart - kPointerSize;
113  static const int kInputString = kStartIndex - kPointerSize;
114  // When adding local variables remember to push space for them in
115  // the frame in GetCode.
116  static const int kSuccessfulCaptures = kInputString - kPointerSize;
117  static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
118  // First register address. Following registers are below it on the stack.
119  static const int kRegisterZero = kStringStartMinusOne - kPointerSize;
120
121  // Initial size of code buffer.
122  static const size_t kRegExpCodeSize = 1024;
123
124  // Load a number of characters at the given offset from the
125  // current position, into the current-character register.
126  void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
127
128  // Check whether preemption has been requested.
129  void CheckPreemption();
130
131  // Check whether we are exceeding the stack limit on the backtrack stack.
132  void CheckStackLimit();
133
134
135  // Generate a call to CheckStackGuardState.
136  void CallCheckStackGuardState(Register scratch);
137
138  // The ebp-relative location of a regexp register.
139  MemOperand register_location(int register_index);
140
141  // Register holding the current input position as negative offset from
142  // the end of the string.
143  inline Register current_input_offset() { return r27; }
144
145  // The register containing the current character after LoadCurrentCharacter.
146  inline Register current_character() { return r28; }
147
148  // Register holding address of the end of the input string.
149  inline Register end_of_input_address() { return r30; }
150
151  // Register holding the frame address. Local variables, parameters and
152  // regexp registers are addressed relative to this.
153  inline Register frame_pointer() { return fp; }
154
155  // The register containing the backtrack stack top. Provides a meaningful
156  // name to the register.
157  inline Register backtrack_stackpointer() { return r29; }
158
159  // Register holding pointer to the current code object.
160  inline Register code_pointer() { return r26; }
161
162  // Byte size of chars in the string to match (decided by the Mode argument)
163  inline int char_size() { return static_cast<int>(mode_); }
164
165  // Equivalent to a conditional branch to the label, unless the label
166  // is NULL, in which case it is a conditional Backtrack.
167  void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7);
168
169  // Call and return internally in the generated code in a way that
170  // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
171  inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7);
172  inline void SafeReturn();
173  inline void SafeCallTarget(Label* name);
174
175  // Pushes the value of a register on the backtrack stack. Decrements the
176  // stack pointer by a word size and stores the register's value there.
177  inline void Push(Register source);
178
179  // Pops a value from the backtrack stack. Reads the word at the stack pointer
180  // and increments it by a word size.
181  inline void Pop(Register target);
182
183  Isolate* isolate() const { return masm_->isolate(); }
184
185  MacroAssembler* masm_;
186
187  // Which mode to generate code for (Latin1 or UC16).
188  Mode mode_;
189
190  // One greater than maximal register index actually used.
191  int num_registers_;
192
193  // Number of registers to output at the end (the saved registers
194  // are always 0..num_saved_registers_-1)
195  int num_saved_registers_;
196
197  // Labels used internally.
198  Label entry_label_;
199  Label start_label_;
200  Label success_label_;
201  Label backtrack_label_;
202  Label exit_label_;
203  Label check_preempt_label_;
204  Label stack_overflow_label_;
205  Label internal_failure_label_;
206};
207
208// Set of non-volatile registers saved/restored by generated regexp code.
209const RegList kRegExpCalleeSaved =
210    1 << 25 | 1 << 26 | 1 << 27 | 1 << 28 | 1 << 29 | 1 << 30 | 1 << 31;
211
212#endif  // V8_INTERPRETED_REGEXP
213}  // namespace internal
214}  // namespace v8
215
216#endif  // V8_REGEXP_PPC_REGEXP_MACRO_ASSEMBLER_PPC_H_
217