// Copyright 2012 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_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
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#define V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
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#include "src/macro-assembler.h"
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#include "src/regexp/regexp-macro-assembler.h"
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#include "src/x64/assembler-x64.h"
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#include "src/zone/zone-chunk-list.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 RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler {
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public:
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RegExpMacroAssemblerX64(Isolate* isolate, Zone* zone, Mode mode,
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int registers_to_save);
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virtual ~RegExpMacroAssemblerX64();
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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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static Result Match(Handle<Code> regexp,
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Handle<String> subject,
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int* offsets_vector,
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int offsets_vector_length,
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int previous_index,
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Isolate* isolate);
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static Result Execute(Code* code,
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String* input,
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int start_offset,
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const byte* input_start,
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const byte* input_end,
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int* output,
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bool at_start);
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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 int CheckStackGuardState(Address* return_address,
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Code* re_code,
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Address re_frame);
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private:
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// Offsets from rbp of function parameters and stored registers.
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static const int kFramePointer = 0;
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// Above the frame pointer - function parameters and return address.
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static const int kReturn_eip = kFramePointer + kRegisterSize;
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static const int kFrameAlign = kReturn_eip + kRegisterSize;
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#ifdef _WIN64
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// Parameters (first four passed as registers, but with room on stack).
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// In Microsoft 64-bit Calling Convention, there is room on the callers
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// stack (before the return address) to spill parameter registers. We
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// use this space to store the register passed parameters.
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static const int kInputString = kFrameAlign;
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// StartIndex is passed as 32 bit int.
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static const int kStartIndex = kInputString + kRegisterSize;
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static const int kInputStart = kStartIndex + kRegisterSize;
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static const int kInputEnd = kInputStart + kRegisterSize;
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static const int kRegisterOutput = kInputEnd + kRegisterSize;
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// For the case of global regular expression, we have room to store at least
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// one set of capture results. For the case of non-global regexp, we ignore
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// this value. NumOutputRegisters is passed as 32-bit value. The upper
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// 32 bit of this 64-bit stack slot may contain garbage.
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static const int kNumOutputRegisters = kRegisterOutput + kRegisterSize;
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static const int kStackHighEnd = kNumOutputRegisters + kRegisterSize;
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// DirectCall is passed as 32 bit int (values 0 or 1).
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static const int kDirectCall = kStackHighEnd + kRegisterSize;
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static const int kIsolate = kDirectCall + kRegisterSize;
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#else
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// In AMD64 ABI Calling Convention, the first six integer parameters
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// are passed as registers, and caller must allocate space on the stack
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// if it wants them stored. We push the parameters after the frame pointer.
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static const int kInputString = kFramePointer - kRegisterSize;
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static const int kStartIndex = kInputString - kRegisterSize;
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static const int kInputStart = kStartIndex - kRegisterSize;
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static const int kInputEnd = kInputStart - kRegisterSize;
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static const int kRegisterOutput = kInputEnd - kRegisterSize;
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// For the case of global regular expression, we have room to store at least
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// one set of capture results. For the case of non-global regexp, we ignore
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// this value.
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static const int kNumOutputRegisters = kRegisterOutput - kRegisterSize;
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static const int kStackHighEnd = kFrameAlign;
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static const int kDirectCall = kStackHighEnd + kRegisterSize;
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static const int kIsolate = kDirectCall + kRegisterSize;
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#endif
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#ifdef _WIN64
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// Microsoft calling convention has three callee-saved registers
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// (that we are using). We push these after the frame pointer.
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static const int kBackup_rsi = kFramePointer - kRegisterSize;
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static const int kBackup_rdi = kBackup_rsi - kRegisterSize;
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static const int kBackup_rbx = kBackup_rdi - kRegisterSize;
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static const int kLastCalleeSaveRegister = kBackup_rbx;
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#else
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// AMD64 Calling Convention has only one callee-save register that
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// we use. We push this after the frame pointer (and after the
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// parameters).
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static const int kBackup_rbx = kNumOutputRegisters - kRegisterSize;
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static const int kLastCalleeSaveRegister = kBackup_rbx;
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#endif
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static const int kSuccessfulCaptures = kLastCalleeSaveRegister - 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 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();
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// The rbp-relative location of a regexp register.
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Operand register_location(int register_index);
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// The register containing the current character after LoadCurrentCharacter.
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inline Register current_character() { return rdx; }
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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 rcx; }
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// The registers containing a self pointer to this code's Code object.
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inline Register code_object_pointer() { return r8; }
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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(Condition condition, Label* to);
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void MarkPositionForCodeRelativeFixup() {
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code_relative_fixup_positions_.push_back(masm_.pc_offset());
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}
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void FixupCodeRelativePositions();
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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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inline void SafeCallTarget(Label* label);
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inline void SafeReturn();
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// Pushes the value of a register on the backtrack stack. Decrements the
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// stack pointer (rcx) by a word size and stores the register's value there.
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inline void Push(Register source);
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// Pushes a value on the backtrack stack. Decrements the stack pointer (rcx)
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// by a word size and stores the value there.
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inline void Push(Immediate value);
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// Pushes the Code object relative offset of a label on the backtrack stack
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// (i.e., a backtrack target). Decrements the stack pointer (rcx)
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// by a word size and stores the value there.
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inline void Push(Label* label);
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// Pops a value from the backtrack stack. Reads the word at the stack pointer
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// (rcx) and increments it by a word size.
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inline void Pop(Register target);
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// Drops the top value from the backtrack stack without reading it.
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// Increments the stack pointer (rcx) by a word size.
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inline void Drop();
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inline void ReadPositionFromRegister(Register dst, int reg);
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Isolate* isolate() const { return masm_.isolate(); }
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MacroAssembler masm_;
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NoRootArrayScope no_root_array_scope_;
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ZoneChunkList<int> code_relative_fixup_positions_;
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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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};
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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_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
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