| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * vim: set ts=8 sts=4 et sw=4 tw=99: */ |
| |
| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_NATIVE_REGEXP_MACRO_ASSEMBLER_H_ |
| #define V8_NATIVE_REGEXP_MACRO_ASSEMBLER_H_ |
| |
| #include "irregexp/RegExpMacroAssembler.h" |
| |
| namespace js { |
| namespace irregexp { |
| |
| struct InputOutputData |
| { |
| const void* inputStart; |
| const void* inputEnd; |
| |
| // Index into inputStart (in chars) at which to begin matching. |
| size_t startIndex; |
| |
| MatchPairs* matches; |
| |
| // RegExpMacroAssembler::Result for non-global regexps, number of captures |
| // for global regexps. |
| int32_t result; |
| |
| template <typename CharT> |
| InputOutputData(const CharT* inputStart, const CharT* inputEnd, |
| size_t startIndex, MatchPairs* matches) |
| : inputStart(inputStart), |
| inputEnd(inputEnd), |
| startIndex(startIndex), |
| matches(matches), |
| result(0) |
| {} |
| }; |
| |
| struct FrameData |
| { |
| // Copy of the input/output data's data. |
| char16_t* inputStart; |
| size_t startIndex; |
| |
| // Pointer to the character before the input start. |
| char16_t* inputStartMinusOne; |
| |
| // Copy of the input MatchPairs registers, may be modified by JIT code. |
| int32_t* outputRegisters; |
| int32_t numOutputRegisters; |
| |
| int32_t successfulCaptures; |
| |
| void* backtrackStackBase; |
| }; |
| |
| class MOZ_STACK_CLASS NativeRegExpMacroAssembler : public RegExpMacroAssembler |
| { |
| public: |
| // Type of input string to generate code for. |
| enum Mode { ASCII = 1, CHAR16 = 2 }; |
| |
| NativeRegExpMacroAssembler(LifoAlloc* alloc, RegExpShared* shared, |
| JSRuntime* rt, Mode mode, int registers_to_save); |
| |
| // Inherited virtual methods. |
| RegExpCode GenerateCode(JSContext* cx, bool match_only); |
| int stack_limit_slack(); |
| bool CanReadUnaligned(); |
| void AdvanceCurrentPosition(int by); |
| void AdvanceRegister(int reg, int by); |
| void Backtrack(); |
| void Bind(jit::Label* label); |
| void CheckAtStart(jit::Label* on_at_start); |
| void CheckCharacter(unsigned c, jit::Label* on_equal); |
| void CheckCharacterAfterAnd(unsigned c, unsigned and_with, jit::Label* on_equal); |
| void CheckCharacterGT(char16_t limit, jit::Label* on_greater); |
| void CheckCharacterLT(char16_t limit, jit::Label* on_less); |
| void CheckGreedyLoop(jit::Label* on_tos_equals_current_position); |
| void CheckNotAtStart(jit::Label* on_not_at_start); |
| void CheckNotBackReference(int start_reg, jit::Label* on_no_match); |
| void CheckNotBackReferenceIgnoreCase(int start_reg, jit::Label* on_no_match); |
| void CheckNotCharacter(unsigned c, jit::Label* on_not_equal); |
| void CheckNotCharacterAfterAnd(unsigned c, unsigned and_with, jit::Label* on_not_equal); |
| void CheckNotCharacterAfterMinusAnd(char16_t c, char16_t minus, char16_t and_with, |
| jit::Label* on_not_equal); |
| void CheckCharacterInRange(char16_t from, char16_t to, |
| jit::Label* on_in_range); |
| void CheckCharacterNotInRange(char16_t from, char16_t to, |
| jit::Label* on_not_in_range); |
| void CheckBitInTable(uint8_t* table, jit::Label* on_bit_set); |
| void CheckPosition(int cp_offset, jit::Label* on_outside_input); |
| void JumpOrBacktrack(jit::Label* to); |
| bool CheckSpecialCharacterClass(char16_t type, jit::Label* on_no_match); |
| void Fail(); |
| void IfRegisterGE(int reg, int comparand, jit::Label* if_ge); |
| void IfRegisterLT(int reg, int comparand, jit::Label* if_lt); |
| void IfRegisterEqPos(int reg, jit::Label* if_eq); |
| void LoadCurrentCharacter(int cp_offset, jit::Label* on_end_of_input, |
| bool check_bounds = true, int characters = 1); |
| void PopCurrentPosition(); |
| void PopRegister(int register_index); |
| void PushCurrentPosition(); |
| void PushRegister(int register_index, StackCheckFlag check_stack_limit); |
| void ReadCurrentPositionFromRegister(int reg); |
| void ReadBacktrackStackPointerFromRegister(int reg); |
| void SetCurrentPositionFromEnd(int by); |
| void SetRegister(int register_index, int to); |
| bool Succeed(); |
| void WriteCurrentPositionToRegister(int reg, int cp_offset); |
| void ClearRegisters(int reg_from, int reg_to); |
| void WriteBacktrackStackPointerToRegister(int reg); |
| void PushBacktrack(jit::Label* label); |
| void BindBacktrack(jit::Label* label); |
| |
| // Compares two-byte strings case insensitively. |
| // Called from generated RegExp code. |
| static int CaseInsensitiveCompareUC16(jit::Address byte_offset1, |
| jit::Address byte_offset2, |
| size_t byte_length); |
| |
| // Byte map of one byte characters with a 0xff if the character is a word |
| // character (digit, letter or underscore) and 0x00 otherwise. |
| // Used by generated RegExp code. |
| static const uint8_t word_character_map[256]; |
| |
| // Byte size of chars in the string to match (decided by the Mode argument) |
| inline int char_size() { return static_cast<int>(mode_); } |
| inline jit::Scale factor() { return mode_ == CHAR16 ? jit::TimesTwo : jit::TimesOne; } |
| |
| jit::Label* BranchOrBacktrack(jit::Label* branch); |
| |
| // Pushes a register or constant on the backtrack stack. Decrements the |
| // stack pointer by a word size and stores the register's value there. |
| void PushBacktrack(jit::Register value); |
| void PushBacktrack(int32_t value); |
| |
| // Pop a value from the backtrack stack. |
| void PopBacktrack(jit::Register target); |
| |
| // Check whether we are exceeding the stack limit on the backtrack stack. |
| void CheckBacktrackStackLimit(); |
| |
| void LoadCurrentCharacterUnchecked(int cp_offset, int characters); |
| |
| private: |
| jit::MacroAssembler masm; |
| |
| JSRuntime* runtime; |
| Mode mode_; |
| jit::Label entry_label_; |
| jit::Label start_label_; |
| jit::Label backtrack_label_; |
| jit::Label success_label_; |
| jit::Label exit_label_; |
| jit::Label stack_overflow_label_; |
| jit::Label exit_with_exception_label_; |
| |
| // Set of registers which are used by the code generator, and as such which |
| // are saved. |
| jit::LiveGeneralRegisterSet savedNonVolatileRegisters; |
| |
| struct LabelPatch { |
| // Once it is bound via BindBacktrack, |label| becomes null and |
| // |labelOffset| is set. |
| jit::Label* label; |
| size_t labelOffset; |
| |
| jit::CodeOffset patchOffset; |
| |
| LabelPatch(jit::Label* label, jit::CodeOffset patchOffset) |
| : label(label), labelOffset(0), patchOffset(patchOffset) |
| {} |
| }; |
| |
| Vector<LabelPatch, 4, SystemAllocPolicy> labelPatches; |
| |
| // See RegExpMacroAssembler.cpp for the meaning of these registers. |
| jit::Register input_end_pointer; |
| jit::Register current_character; |
| jit::Register current_position; |
| jit::Register backtrack_stack_pointer; |
| jit::Register temp0, temp1, temp2; |
| |
| // The frame_pointer-relative location of a regexp register. |
| jit::Address register_location(int register_index) { |
| checkRegister(register_index); |
| return jit::Address(masm.getStackPointer(), register_offset(register_index)); |
| } |
| |
| int32_t register_offset(int register_index) { |
| return sizeof(FrameData) + register_index * sizeof(void*); |
| } |
| }; |
| |
| } } // namespace js::irregexp |
| |
| #endif // V8_NATIVE_REGEXP_MACRO_ASSEMBLER_H_ |