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// Copyright 2012 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_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
#define V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
#include "src/codegen/macro-assembler.h"
#include "src/codegen/x64/assembler-x64.h"
#include "src/regexp/regexp-macro-assembler.h"
#include "src/zone/zone-chunk-list.h"
namespace v8 {
namespace internal {
class V8_EXPORT_PRIVATE RegExpMacroAssemblerX64
: public NativeRegExpMacroAssembler {
public:
RegExpMacroAssemblerX64(Isolate* isolate, Zone* zone, Mode mode,
int registers_to_save);
~RegExpMacroAssemblerX64() override;
int stack_limit_slack() override;
void AdvanceCurrentPosition(int by) override;
void AdvanceRegister(int reg, int by) override;
void Backtrack() override;
void Bind(Label* label) override;
void CheckAtStart(int cp_offset, Label* on_at_start) override;
void CheckCharacter(uint32_t c, Label* on_equal) override;
void CheckCharacterAfterAnd(uint32_t c, uint32_t mask,
Label* on_equal) override;
void CheckCharacterGT(uc16 limit, Label* on_greater) override;
void CheckCharacterLT(uc16 limit, Label* on_less) override;
// A "greedy loop" is a loop that is both greedy and with a simple
// body. It has a particularly simple implementation.
void CheckGreedyLoop(Label* on_tos_equals_current_position) override;
void CheckNotAtStart(int cp_offset, Label* on_not_at_start) override;
void CheckNotBackReference(int start_reg, bool read_backward,
Label* on_no_match) override;
void CheckNotBackReferenceIgnoreCase(int start_reg, bool read_backward,
bool unicode,
Label* on_no_match) override;
void CheckNotCharacter(uint32_t c, Label* on_not_equal) override;
void CheckNotCharacterAfterAnd(uint32_t c, uint32_t mask,
Label* on_not_equal) override;
void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
Label* on_not_equal) override;
void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range) override;
void CheckCharacterNotInRange(uc16 from, uc16 to,
Label* on_not_in_range) override;
void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set) override;
// Checks whether the given offset from the current position is before
// the end of the string.
void CheckPosition(int cp_offset, Label* on_outside_input) override;
bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match) override;
void Fail() override;
Handle<HeapObject> GetCode(Handle<String> source) override;
void GoTo(Label* label) override;
void IfRegisterGE(int reg, int comparand, Label* if_ge) override;
void IfRegisterLT(int reg, int comparand, Label* if_lt) override;
void IfRegisterEqPos(int reg, Label* if_eq) override;
IrregexpImplementation Implementation() override;
void LoadCurrentCharacterUnchecked(int cp_offset,
int character_count) override;
void PopCurrentPosition() override;
void PopRegister(int register_index) override;
void PushBacktrack(Label* label) override;
void PushCurrentPosition() override;
void PushRegister(int register_index,
StackCheckFlag check_stack_limit) override;
void ReadCurrentPositionFromRegister(int reg) override;
void ReadStackPointerFromRegister(int reg) override;
void SetCurrentPositionFromEnd(int by) override;
void SetRegister(int register_index, int to) override;
bool Succeed() override;
void WriteCurrentPositionToRegister(int reg, int cp_offset) override;
void ClearRegisters(int reg_from, int reg_to) override;
void WriteStackPointerToRegister(int reg) override;
// Called from RegExp if the stack-guard is triggered.
// If the code object is relocated, the return address is fixed before
// returning.
// {raw_code} is an Address because this is called via ExternalReference.
static int CheckStackGuardState(Address* return_address, Address raw_code,
Address re_frame);
private:
// Offsets from rbp of function parameters and stored registers.
static const int kFramePointer = 0;
// Above the frame pointer - function parameters and return address.
static const int kReturn_eip = kFramePointer + kSystemPointerSize;
static const int kFrameAlign = kReturn_eip + kSystemPointerSize;
#ifdef V8_TARGET_OS_WIN
// Parameters (first four passed as registers, but with room on stack).
// In Microsoft 64-bit Calling Convention, there is room on the callers
// stack (before the return address) to spill parameter registers. We
// use this space to store the register passed parameters.
static const int kInputString = kFrameAlign;
// StartIndex is passed as 32 bit int.
static const int kStartIndex = kInputString + kSystemPointerSize;
static const int kInputStart = kStartIndex + kSystemPointerSize;
static const int kInputEnd = kInputStart + kSystemPointerSize;
static const int kRegisterOutput = kInputEnd + kSystemPointerSize;
// For the case of global regular expression, we have room to store at least
// one set of capture results. For the case of non-global regexp, we ignore
// this value. NumOutputRegisters is passed as 32-bit value. The upper
// 32 bit of this 64-bit stack slot may contain garbage.
static const int kNumOutputRegisters = kRegisterOutput + kSystemPointerSize;
static const int kStackHighEnd = kNumOutputRegisters + kSystemPointerSize;
// DirectCall is passed as 32 bit int (values 0 or 1).
static const int kDirectCall = kStackHighEnd + kSystemPointerSize;
static const int kIsolate = kDirectCall + kSystemPointerSize;
#else
// In AMD64 ABI Calling Convention, the first six integer parameters
// are passed as registers, and caller must allocate space on the stack
// if it wants them stored. We push the parameters after the frame pointer.
static const int kInputString = kFramePointer - kSystemPointerSize;
static const int kStartIndex = kInputString - kSystemPointerSize;
static const int kInputStart = kStartIndex - kSystemPointerSize;
static const int kInputEnd = kInputStart - kSystemPointerSize;
static const int kRegisterOutput = kInputEnd - kSystemPointerSize;
// For the case of global regular expression, we have room to store at least
// one set of capture results. For the case of non-global regexp, we ignore
// this value.
static const int kNumOutputRegisters = kRegisterOutput - kSystemPointerSize;
static const int kStackHighEnd = kFrameAlign;
static const int kDirectCall = kStackHighEnd + kSystemPointerSize;
static const int kIsolate = kDirectCall + kSystemPointerSize;
#endif
#ifdef V8_TARGET_OS_WIN
// Microsoft calling convention has three callee-saved registers
// (that we are using). We push these after the frame pointer.
static const int kBackup_rsi = kFramePointer - kSystemPointerSize;
static const int kBackup_rdi = kBackup_rsi - kSystemPointerSize;
static const int kBackup_rbx = kBackup_rdi - kSystemPointerSize;
static const int kLastCalleeSaveRegister = kBackup_rbx;
#else
// AMD64 Calling Convention has only one callee-save register that
// we use. We push this after the frame pointer (and after the
// parameters).
static const int kBackup_rbx = kNumOutputRegisters - kSystemPointerSize;
static const int kLastCalleeSaveRegister = kBackup_rbx;
#endif
// When adding local variables remember to push space for them in
// the frame in GetCode.
static const int kSuccessfulCaptures =
kLastCalleeSaveRegister - kSystemPointerSize;
static const int kStringStartMinusOne =
kSuccessfulCaptures - kSystemPointerSize;
static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize;
// First register address. Following registers are below it on the stack.
static const int kRegisterZero = kBacktrackCount - kSystemPointerSize;
// Initial size of code buffer.
static const int kRegExpCodeSize = 1024;
// Check whether preemption has been requested.
void CheckPreemption();
// Check whether we are exceeding the stack limit on the backtrack stack.
void CheckStackLimit();
// Generate a call to CheckStackGuardState.
void CallCheckStackGuardState();
// The rbp-relative location of a regexp register.
Operand register_location(int register_index);
// The register containing the current character after LoadCurrentCharacter.
inline Register current_character() { return rdx; }
// The register containing the backtrack stack top. Provides a meaningful
// name to the register.
inline Register backtrack_stackpointer() { return rcx; }
// The registers containing a self pointer to this code's Code object.
inline Register code_object_pointer() { return r8; }
// 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);
void MarkPositionForCodeRelativeFixup() {
code_relative_fixup_positions_.push_back(masm_.pc_offset());
}
void FixupCodeRelativePositions();
// 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);
inline void SafeCallTarget(Label* label);
inline void SafeReturn();
// Pushes the value of a register on the backtrack stack. Decrements the
// stack pointer (rcx) by a word size and stores the register's value there.
inline void Push(Register source);
// Pushes a value on the backtrack stack. Decrements the stack pointer (rcx)
// by a word size and stores the value there.
inline void Push(Immediate value);
// Pushes the Code object relative offset of a label on the backtrack stack
// (i.e., a backtrack target). Decrements the stack pointer (rcx)
// by a word size and stores the value there.
inline void Push(Label* label);
// Pops a value from the backtrack stack. Reads the word at the stack pointer
// (rcx) and increments it by a word size.
inline void Pop(Register target);
// Drops the top value from the backtrack stack without reading it.
// Increments the stack pointer (rcx) by a word size.
inline void Drop();
inline void ReadPositionFromRegister(Register dst, int reg);
Isolate* isolate() const { return masm_.isolate(); }
MacroAssembler masm_;
NoRootArrayScope no_root_array_scope_;
ZoneChunkList<int> code_relative_fixup_positions_;
// 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 fallback_label_;
};
} // namespace internal
} // namespace v8
#endif // V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_