// 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_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ #define V8_REGEXP_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_ #include "src/base/strings.h" #include "src/codegen/ia32/assembler-ia32.h" #include "src/codegen/macro-assembler.h" #include "src/regexp/regexp-macro-assembler.h" namespace v8 { namespace internal { class V8_EXPORT_PRIVATE RegExpMacroAssemblerIA32 : public NativeRegExpMacroAssembler { public: RegExpMacroAssemblerIA32(Isolate* isolate, Zone* zone, Mode mode, int registers_to_save); ~RegExpMacroAssemblerIA32() 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(base::uc16 limit, Label* on_greater) override; void CheckCharacterLT(base::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(base::uc16 c, base::uc16 minus, base::uc16 mask, Label* on_not_equal) override; void CheckCharacterInRange(base::uc16 from, base::uc16 to, Label* on_in_range) override; void CheckCharacterNotInRange(base::uc16 from, base::uc16 to, Label* on_not_in_range) override; bool CheckCharacterInRangeArray(const ZoneList<CharacterRange>* ranges, Label* on_in_range) override; bool CheckCharacterNotInRangeArray(const ZoneList<CharacterRange>* ranges, 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(StandardCharacterSet 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: Operand StaticVariable(const ExternalReference& ext); // Offsets from ebp 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; // Parameters. static const int kInputString = kFrameAlign; 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 kDirectCall = kNumOutputRegisters + kSystemPointerSize; static const int kIsolate = kDirectCall + kSystemPointerSize; // Below the frame pointer - local stack variables. // When adding local variables remember to push space for them in // the frame in GetCode. static const int kBackup_esi = kFramePointer - kSystemPointerSize; static const int kBackup_edi = kBackup_esi - kSystemPointerSize; static const int kBackup_ebx = kBackup_edi - kSystemPointerSize; static const int kLastCalleeSaveRegister = kBackup_ebx; static const int kSuccessfulCaptures = kLastCalleeSaveRegister - kSystemPointerSize; static const int kStringStartMinusOne = kSuccessfulCaptures - kSystemPointerSize; static const int kBacktrackCount = kStringStartMinusOne - kSystemPointerSize; // Stores the initial value of the regexp stack pointer in a // position-independent representation (in case the regexp stack grows and // thus moves). static const int kRegExpStackBasePointer = kBacktrackCount - kSystemPointerSize; // First register address. Following registers are below it on the stack. static const int kRegisterZero = kRegExpStackBasePointer - kSystemPointerSize; // Initial size of code buffer. static const int kRegExpCodeSize = 1024; void PushCallerSavedRegisters(); void PopCallerSavedRegisters(); // Check whether preemption has been requested. void CheckPreemption(); // Check whether we are exceeding the stack limit on the backtrack stack. void CheckStackLimit(); void CallCheckStackGuardState(Register scratch); void CallIsCharacterInRangeArray(const ZoneList<CharacterRange>* ranges); // The ebp-relative location of a regexp register. Operand register_location(int register_index); // The register containing the current character after LoadCurrentCharacter. static constexpr Register current_character() { return edx; } // The register containing the backtrack stack top. Provides a meaningful // name to the register. static constexpr Register backtrack_stackpointer() { return ecx; } // Byte size of chars in the string to match (decided by the Mode argument) inline int char_size() const { 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); // 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 SafeReturn(); inline void SafeCallTarget(Label* name); // Pushes the value of a register on the backtrack stack. Decrements the // stack pointer (ecx) 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 (ecx) // by a word size and stores the value there. inline void Push(Immediate value); // Pops a value from the backtrack stack. Reads the word at the stack pointer // (ecx) and increments it by a word size. inline void Pop(Register target); void LoadRegExpStackPointerFromMemory(Register dst); void StoreRegExpStackPointerToMemory(Register src, Register scratch); void PushRegExpBasePointer(Register stack_pointer, Register scratch); void PopRegExpBasePointer(Register stack_pointer_out, Register scratch); Isolate* isolate() const { return masm_->isolate(); } const std::unique_ptr<MacroAssembler> masm_; const NoRootArrayScope no_root_array_scope_; // Which mode to generate code for (LATIN1 or UC16). const 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). const 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_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_