src/v8/src/regexp/s390/regexp-macro-assembler-s390.h - cobalt - Git at Google

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #ifndef V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_
 #define V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_

 #include "src/macro-assembler.h"
 #include "src/regexp/regexp-macro-assembler.h"
 #include "src/s390/assembler-s390.h"

 namespace v8 {
 namespace internal {

 #ifndef V8_INTERPRETED_REGEXP
 class RegExpMacroAssemblerS390 : public NativeRegExpMacroAssembler {
  public:
   RegExpMacroAssemblerS390(Isolate* isolate, Zone* zone, Mode mode,
                            int registers_to_save);
   virtual ~RegExpMacroAssemblerS390();
   virtual int stack_limit_slack();
   virtual void AdvanceCurrentPosition(int by);
   virtual void AdvanceRegister(int reg, int by);
   virtual void Backtrack();
   virtual void Bind(Label* label);
   virtual void CheckAtStart(Label* on_at_start);
   virtual void CheckCharacter(unsigned c, Label* on_equal);
   virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask,
                                       Label* on_equal);
   virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
   virtual void CheckCharacterLT(uc16 limit, Label* on_less);
   // A "greedy loop" is a loop that is both greedy and with a simple
   // body. It has a particularly simple implementation.
   virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
   virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
   virtual void CheckNotBackReference(int start_reg, bool read_backward,
                                      Label* on_no_match);
   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
                                                bool read_backward, bool unicode,
                                                Label* on_no_match);
   virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
   virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask,
                                          Label* on_not_equal);
   virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
                                               Label* on_not_equal);
   virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range);
   virtual void CheckCharacterNotInRange(uc16 from, uc16 to,
                                         Label* on_not_in_range);
   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);

   // Checks whether the given offset from the current position is before
   // the end of the string.
   virtual void CheckPosition(int cp_offset, Label* on_outside_input);
   virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
   virtual void Fail();
   virtual Handle<HeapObject> GetCode(Handle<String> source);
   virtual void GoTo(Label* label);
   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
   virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
   virtual void IfRegisterEqPos(int reg, Label* if_eq);
   virtual IrregexpImplementation Implementation();
   virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input,
                                     bool check_bounds = true,
                                     int characters = 1);
   virtual void PopCurrentPosition();
   virtual void PopRegister(int register_index);
   virtual void PushBacktrack(Label* label);
   virtual void PushCurrentPosition();
   virtual void PushRegister(int register_index,
                             StackCheckFlag check_stack_limit);
   virtual void ReadCurrentPositionFromRegister(int reg);
   virtual void ReadStackPointerFromRegister(int reg);
   virtual void SetCurrentPositionFromEnd(int by);
   virtual void SetRegister(int register_index, int to);
   virtual bool Succeed();
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
   virtual void ClearRegisters(int reg_from, int reg_to);
   virtual void WriteStackPointerToRegister(int reg);

   // Called from RegExp if the stack-guard is triggered.
   // If the code object is relocated, the return address is fixed before
   // returning.
   static int CheckStackGuardState(Address* return_address, Code* re_code,
                                   Address re_frame);

  private:
   // Offsets from frame_pointer() of function parameters and stored registers.
   static const int kFramePointer = 0;

   // Above the frame pointer - Stored registers and stack passed parameters.
   // Register 6-15(sp)
   static const int kStoredRegisters = kFramePointer;
   static const int kCallerFrame =
       kStoredRegisters + kCalleeRegisterSaveAreaSize;
   // Stack parameters placed by caller.
   static const int kCaptureArraySize = kCallerFrame;
   static const int kStackAreaBase = kCallerFrame + kPointerSize;
   // kDirectCall again
   static const int kIsolate = kStackAreaBase + 2 * kPointerSize;

   // Below the frame pointer.
   // Register parameters stored by setup code.
   static const int kDirectCall = kFramePointer - kPointerSize;
   static const int kStackHighEnd = kDirectCall - kPointerSize;
   static const int kNumOutputRegisters = kStackHighEnd - kPointerSize;
   static const int kRegisterOutput = kNumOutputRegisters - kPointerSize;
   static const int kInputEnd = kRegisterOutput - kPointerSize;
   static const int kInputStart = kInputEnd - kPointerSize;
   static const int kStartIndex = kInputStart - kPointerSize;
   static const int kInputString = kStartIndex - kPointerSize;
   // When adding local variables remember to push space for them in
   // the frame in GetCode.
   static const int kSuccessfulCaptures = kInputString - kPointerSize;
   static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
   // First register address. Following registers are below it on the stack.
   static const int kRegisterZero = kStringStartMinusOne - kPointerSize;

   // Initial size of code buffer.
   static const size_t kRegExpCodeSize = 1024;

   // Load a number of characters at the given offset from the
   // current position, into the current-character register.
   void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);

   // Check whether preemption has been requested.
   void CheckPreemption();

   // Check whether we are exceeding the stack limit on the backtrack stack.
   void CheckStackLimit();
   void CallCFunctionUsingStub(ExternalReference function, int num_arguments);

   // Generate a call to CheckStackGuardState.
   void CallCheckStackGuardState(Register scratch);

   // The ebp-relative location of a regexp register.
   MemOperand register_location(int register_index);

   // Register holding the current input position as negative offset from
   // the end of the string.
   inline Register current_input_offset() { return r8; }

   // The register containing the current character after LoadCurrentCharacter.
   inline Register current_character() { return r9; }

   // Register holding address of the end of the input string.
   inline Register end_of_input_address() { return r10; }

   // Register holding the frame address. Local variables, parameters and
   // regexp registers are addressed relative to this.
   inline Register frame_pointer() { return fp; }

   // The register containing the backtrack stack top. Provides a meaningful
   // name to the register.
   inline Register backtrack_stackpointer() { return r13; }

   // Register holding pointer to the current code object.
   inline Register code_pointer() { return r7; }

   // Byte size of chars in the string to match (decided by the Mode argument)
   inline int char_size() { return static_cast<int>(mode_); }

   // Equivalent to a conditional branch to the label, unless the label
   // is nullptr, in which case it is a conditional Backtrack.
   void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7);

   // Call and return internally in the generated code in a way that
   // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
   inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7);
   inline void SafeReturn();
   inline void SafeCallTarget(Label* name);

   // Pushes the value of a register on the backtrack stack. Decrements the
   // stack pointer by a word size and stores the register's value there.
   inline void Push(Register source);

   // Pops a value from the backtrack stack. Reads the word at the stack pointer
   // and increments it by a word size.
   inline void Pop(Register target);

   Isolate* isolate() const { return masm_->isolate(); }

   MacroAssembler* masm_;

   // Which mode to generate code for (Latin1 or UC16).
   Mode mode_;

   // One greater than maximal register index actually used.
   int num_registers_;

   // Number of registers to output at the end (the saved registers
   // are always 0..num_saved_registers_-1)
   int num_saved_registers_;

   // Labels used internally.
   Label entry_label_;
   Label start_label_;
   Label success_label_;
   Label backtrack_label_;
   Label exit_label_;
   Label check_preempt_label_;
   Label stack_overflow_label_;
   Label internal_failure_label_;
 };

 // Set of non-volatile registers saved/restored by generated regexp code.
 const RegList kRegExpCalleeSaved =
     1 << 6 | 1 << 7 | 1 << 8 | 1 << 9 | 1 << 10 | 1 << 11 | 1 << 13;

 #endif  // V8_INTERPRETED_REGEXP
 }  // namespace internal
 }  // namespace v8

 #endif  // V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_
	// Copyright 2015 the V8 project authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#ifndef V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_
	#define V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_

	#include "src/macro-assembler.h"
	#include "src/regexp/regexp-macro-assembler.h"
	#include "src/s390/assembler-s390.h"

	namespace v8 {
	namespace internal {

	#ifndef V8_INTERPRETED_REGEXP
	class RegExpMacroAssemblerS390 : public NativeRegExpMacroAssembler {
	public:
	RegExpMacroAssemblerS390(Isolate* isolate, Zone* zone, Mode mode,
	int registers_to_save);
	virtual ~RegExpMacroAssemblerS390();
	virtual int stack_limit_slack();
	virtual void AdvanceCurrentPosition(int by);
	virtual void AdvanceRegister(int reg, int by);
	virtual void Backtrack();
	virtual void Bind(Label* label);
	virtual void CheckAtStart(Label* on_at_start);
	virtual void CheckCharacter(unsigned c, Label* on_equal);
	virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask,
	Label* on_equal);
	virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
	virtual void CheckCharacterLT(uc16 limit, Label* on_less);
	// A "greedy loop" is a loop that is both greedy and with a simple
	// body. It has a particularly simple implementation.
	virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
	virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
	virtual void CheckNotBackReference(int start_reg, bool read_backward,
	Label* on_no_match);
	virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
	bool read_backward, bool unicode,
	Label* on_no_match);
	virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
	virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask,
	Label* on_not_equal);
	virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
	Label* on_not_equal);
	virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range);
	virtual void CheckCharacterNotInRange(uc16 from, uc16 to,
	Label* on_not_in_range);
	virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);

	// Checks whether the given offset from the current position is before
	// the end of the string.
	virtual void CheckPosition(int cp_offset, Label* on_outside_input);
	virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
	virtual void Fail();
	virtual Handle<HeapObject> GetCode(Handle<String> source);
	virtual void GoTo(Label* label);
	virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
	virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
	virtual void IfRegisterEqPos(int reg, Label* if_eq);
	virtual IrregexpImplementation Implementation();
	virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input,
	bool check_bounds = true,
	int characters = 1);
	virtual void PopCurrentPosition();
	virtual void PopRegister(int register_index);
	virtual void PushBacktrack(Label* label);
	virtual void PushCurrentPosition();
	virtual void PushRegister(int register_index,
	StackCheckFlag check_stack_limit);
	virtual void ReadCurrentPositionFromRegister(int reg);
	virtual void ReadStackPointerFromRegister(int reg);
	virtual void SetCurrentPositionFromEnd(int by);
	virtual void SetRegister(int register_index, int to);
	virtual bool Succeed();
	virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
	virtual void ClearRegisters(int reg_from, int reg_to);
	virtual void WriteStackPointerToRegister(int reg);

	// Called from RegExp if the stack-guard is triggered.
	// If the code object is relocated, the return address is fixed before
	// returning.
	static int CheckStackGuardState(Address* return_address, Code* re_code,
	Address re_frame);

	private:
	// Offsets from frame_pointer() of function parameters and stored registers.
	static const int kFramePointer = 0;

	// Above the frame pointer - Stored registers and stack passed parameters.
	// Register 6-15(sp)
	static const int kStoredRegisters = kFramePointer;
	static const int kCallerFrame =
	kStoredRegisters + kCalleeRegisterSaveAreaSize;
	// Stack parameters placed by caller.
	static const int kCaptureArraySize = kCallerFrame;
	static const int kStackAreaBase = kCallerFrame + kPointerSize;
	// kDirectCall again
	static const int kIsolate = kStackAreaBase + 2 * kPointerSize;

	// Below the frame pointer.
	// Register parameters stored by setup code.
	static const int kDirectCall = kFramePointer - kPointerSize;
	static const int kStackHighEnd = kDirectCall - kPointerSize;
	static const int kNumOutputRegisters = kStackHighEnd - kPointerSize;
	static const int kRegisterOutput = kNumOutputRegisters - kPointerSize;
	static const int kInputEnd = kRegisterOutput - kPointerSize;
	static const int kInputStart = kInputEnd - kPointerSize;
	static const int kStartIndex = kInputStart - kPointerSize;
	static const int kInputString = kStartIndex - kPointerSize;
	// When adding local variables remember to push space for them in
	// the frame in GetCode.
	static const int kSuccessfulCaptures = kInputString - kPointerSize;
	static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
	// First register address. Following registers are below it on the stack.
	static const int kRegisterZero = kStringStartMinusOne - kPointerSize;

	// Initial size of code buffer.
	static const size_t kRegExpCodeSize = 1024;

	// Load a number of characters at the given offset from the
	// current position, into the current-character register.
	void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);

	// Check whether preemption has been requested.
	void CheckPreemption();

	// Check whether we are exceeding the stack limit on the backtrack stack.
	void CheckStackLimit();
	void CallCFunctionUsingStub(ExternalReference function, int num_arguments);

	// Generate a call to CheckStackGuardState.
	void CallCheckStackGuardState(Register scratch);

	// The ebp-relative location of a regexp register.
	MemOperand register_location(int register_index);

	// Register holding the current input position as negative offset from
	// the end of the string.
	inline Register current_input_offset() { return r8; }

	// The register containing the current character after LoadCurrentCharacter.
	inline Register current_character() { return r9; }

	// Register holding address of the end of the input string.
	inline Register end_of_input_address() { return r10; }

	// Register holding the frame address. Local variables, parameters and
	// regexp registers are addressed relative to this.
	inline Register frame_pointer() { return fp; }

	// The register containing the backtrack stack top. Provides a meaningful
	// name to the register.
	inline Register backtrack_stackpointer() { return r13; }

	// Register holding pointer to the current code object.
	inline Register code_pointer() { return r7; }

	// Byte size of chars in the string to match (decided by the Mode argument)
	inline int char_size() { return static_cast<int>(mode_); }

	// Equivalent to a conditional branch to the label, unless the label
	// is nullptr, in which case it is a conditional Backtrack.
	void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7);

	// Call and return internally in the generated code in a way that
	// is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
	inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7);
	inline void SafeReturn();
	inline void SafeCallTarget(Label* name);

	// Pushes the value of a register on the backtrack stack. Decrements the
	// stack pointer by a word size and stores the register's value there.
	inline void Push(Register source);

	// Pops a value from the backtrack stack. Reads the word at the stack pointer
	// and increments it by a word size.
	inline void Pop(Register target);

	Isolate* isolate() const { return masm_->isolate(); }

	MacroAssembler* masm_;

	// Which mode to generate code for (Latin1 or UC16).
	Mode mode_;

	// One greater than maximal register index actually used.
	int num_registers_;

	// Number of registers to output at the end (the saved registers
	// are always 0..num_saved_registers_-1)
	int num_saved_registers_;

	// Labels used internally.
	Label entry_label_;
	Label start_label_;
	Label success_label_;
	Label backtrack_label_;
	Label exit_label_;
	Label check_preempt_label_;
	Label stack_overflow_label_;
	Label internal_failure_label_;
	};

	// Set of non-volatile registers saved/restored by generated regexp code.
	const RegList kRegExpCalleeSaved =
	1 << 6 \| 1 << 7 \| 1 << 8 \| 1 << 9 \| 1 << 10 \| 1 << 11 \| 1 << 13;

	#endif // V8_INTERPRETED_REGEXP
	} // namespace internal
	} // namespace v8

	#endif // V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_