// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_REGEXP_MIPS64_REGEXP_MACRO_ASSEMBLER_MIPS64_H_
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#define V8_REGEXP_MIPS64_REGEXP_MACRO_ASSEMBLER_MIPS64_H_
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#include "src/macro-assembler.h"
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#include "src/mips64/assembler-mips64.h"
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#include "src/regexp/regexp-macro-assembler.h"
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namespace v8 {
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namespace internal {
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#ifndef V8_INTERPRETED_REGEXP
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class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
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public:
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RegExpMacroAssemblerMIPS(Isolate* isolate, Zone* zone, Mode mode,
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int registers_to_save);
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virtual ~RegExpMacroAssemblerMIPS();
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virtual int stack_limit_slack();
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virtual void AdvanceCurrentPosition(int by);
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virtual void AdvanceRegister(int reg, int by);
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virtual void Backtrack();
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virtual void Bind(Label* label);
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virtual void CheckAtStart(Label* on_at_start);
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virtual void CheckCharacter(uint32_t c, Label* on_equal);
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virtual void CheckCharacterAfterAnd(uint32_t c,
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uint32_t mask,
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Label* on_equal);
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virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
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virtual void CheckCharacterLT(uc16 limit, Label* on_less);
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// A "greedy loop" is a loop that is both greedy and with a simple
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// body. It has a particularly simple implementation.
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virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
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virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
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virtual void CheckNotBackReference(int start_reg, bool read_backward,
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Label* on_no_match);
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virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
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bool read_backward, bool unicode,
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Label* on_no_match);
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virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal);
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virtual void CheckNotCharacterAfterAnd(uint32_t c,
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uint32_t mask,
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Label* on_not_equal);
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virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
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uc16 minus,
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uc16 mask,
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Label* on_not_equal);
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virtual void CheckCharacterInRange(uc16 from,
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uc16 to,
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Label* on_in_range);
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virtual void CheckCharacterNotInRange(uc16 from,
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uc16 to,
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Label* on_not_in_range);
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virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
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// Checks whether the given offset from the current position is before
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// the end of the string.
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virtual void CheckPosition(int cp_offset, Label* on_outside_input);
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virtual bool CheckSpecialCharacterClass(uc16 type,
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Label* on_no_match);
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virtual void Fail();
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virtual Handle<HeapObject> GetCode(Handle<String> source);
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virtual void GoTo(Label* label);
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virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
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virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
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virtual void IfRegisterEqPos(int reg, Label* if_eq);
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virtual IrregexpImplementation Implementation();
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virtual void LoadCurrentCharacter(int cp_offset,
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Label* on_end_of_input,
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bool check_bounds = true,
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int characters = 1);
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virtual void PopCurrentPosition();
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virtual void PopRegister(int register_index);
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virtual void PushBacktrack(Label* label);
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virtual void PushCurrentPosition();
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virtual void PushRegister(int register_index,
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StackCheckFlag check_stack_limit);
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virtual void ReadCurrentPositionFromRegister(int reg);
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virtual void ReadStackPointerFromRegister(int reg);
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virtual void SetCurrentPositionFromEnd(int by);
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virtual void SetRegister(int register_index, int to);
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virtual bool Succeed();
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virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
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virtual void ClearRegisters(int reg_from, int reg_to);
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virtual void WriteStackPointerToRegister(int reg);
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virtual bool CanReadUnaligned();
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// Called from RegExp if the stack-guard is triggered.
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// If the code object is relocated, the return address is fixed before
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// returning.
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static int64_t CheckStackGuardState(Address* return_address, Code* re_code,
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Address re_frame);
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void print_regexp_frame_constants();
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private:
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// Offsets from frame_pointer() of function parameters and stored registers.
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static const int kFramePointer = 0;
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// Above the frame pointer - Stored registers and stack passed parameters.
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// Registers s0 to s7, fp, and ra.
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static const int kStoredRegisters = kFramePointer;
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// Return address (stored from link register, read into pc on return).
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// TODO(plind): This 9 - is 8 s-regs (s0..s7) plus fp.
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static const int kReturnAddress = kStoredRegisters + 9 * kPointerSize;
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// Stack frame header.
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static const int kStackFrameHeader = kReturnAddress;
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// Stack parameters placed by caller.
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static const int kIsolate = kStackFrameHeader + kPointerSize;
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// Below the frame pointer.
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// Register parameters stored by setup code.
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static const int kDirectCall = kFramePointer - kPointerSize;
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static const int kStackHighEnd = kDirectCall - kPointerSize;
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static const int kNumOutputRegisters = kStackHighEnd - kPointerSize;
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static const int kRegisterOutput = kNumOutputRegisters - kPointerSize;
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static const int kInputEnd = kRegisterOutput - kPointerSize;
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static const int kInputStart = kInputEnd - kPointerSize;
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static const int kStartIndex = kInputStart - kPointerSize;
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static const int kInputString = kStartIndex - kPointerSize;
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// When adding local variables remember to push space for them in
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// the frame in GetCode.
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static const int kSuccessfulCaptures = kInputString - kPointerSize;
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static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
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// First register address. Following registers are below it on the stack.
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static const int kRegisterZero = kStringStartMinusOne - kPointerSize;
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// Initial size of code buffer.
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static const size_t kRegExpCodeSize = 1024;
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// Load a number of characters at the given offset from the
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// current position, into the current-character register.
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void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
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// Check whether preemption has been requested.
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void CheckPreemption();
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// Check whether we are exceeding the stack limit on the backtrack stack.
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void CheckStackLimit();
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// Generate a call to CheckStackGuardState.
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void CallCheckStackGuardState(Register scratch);
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// The ebp-relative location of a regexp register.
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MemOperand register_location(int register_index);
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// Register holding the current input position as negative offset from
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// the end of the string.
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inline Register current_input_offset() { return a6; }
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// The register containing the current character after LoadCurrentCharacter.
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inline Register current_character() { return a7; }
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// Register holding address of the end of the input string.
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inline Register end_of_input_address() { return t2; }
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// Register holding the frame address. Local variables, parameters and
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// regexp registers are addressed relative to this.
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inline Register frame_pointer() { return fp; }
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// The register containing the backtrack stack top. Provides a meaningful
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// name to the register.
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inline Register backtrack_stackpointer() { return t0; }
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// Register holding pointer to the current code object.
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inline Register code_pointer() { return a5; }
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// Byte size of chars in the string to match (decided by the Mode argument).
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inline int char_size() { return static_cast<int>(mode_); }
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// Equivalent to a conditional branch to the label, unless the label
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// is nullptr, in which case it is a conditional Backtrack.
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void BranchOrBacktrack(Label* to,
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Condition condition,
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Register rs,
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const Operand& rt);
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// Call and return internally in the generated code in a way that
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// is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
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inline void SafeCall(Label* to,
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Condition cond,
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Register rs,
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const Operand& rt);
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inline void SafeReturn();
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inline void SafeCallTarget(Label* name);
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// Pushes the value of a register on the backtrack stack. Decrements the
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// stack pointer by a word size and stores the register's value there.
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inline void Push(Register source);
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// Pops a value from the backtrack stack. Reads the word at the stack pointer
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// and increments it by a word size.
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inline void Pop(Register target);
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Isolate* isolate() const { return masm_->isolate(); }
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MacroAssembler* masm_;
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// Which mode to generate code for (Latin1 or UC16).
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Mode mode_;
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// One greater than maximal register index actually used.
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int num_registers_;
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// Number of registers to output at the end (the saved registers
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// are always 0..num_saved_registers_-1).
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int num_saved_registers_;
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// Labels used internally.
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Label entry_label_;
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Label start_label_;
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Label success_label_;
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Label backtrack_label_;
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Label exit_label_;
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Label check_preempt_label_;
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Label stack_overflow_label_;
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Label internal_failure_label_;
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};
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#endif // V8_INTERPRETED_REGEXP
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} // namespace internal
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} // namespace v8
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#endif // V8_REGEXP_MIPS64_REGEXP_MACRO_ASSEMBLER_MIPS64_H_
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