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Diffstat (limited to 'chromium/v8/src/arm64/regexp-macro-assembler-arm64.h')
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1 files changed, 292 insertions, 0 deletions
diff --git a/chromium/v8/src/arm64/regexp-macro-assembler-arm64.h b/chromium/v8/src/arm64/regexp-macro-assembler-arm64.h new file mode 100644 index 00000000000..c319eae3c59 --- /dev/null +++ b/chromium/v8/src/arm64/regexp-macro-assembler-arm64.h @@ -0,0 +1,292 @@ +// Copyright 2013 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_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_ +#define V8_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_ + +#include "src/arm64/assembler-arm64.h" +#include "src/arm64/assembler-arm64-inl.h" +#include "src/macro-assembler.h" + +namespace v8 { +namespace internal { + + +#ifndef V8_INTERPRETED_REGEXP +class RegExpMacroAssemblerARM64: public NativeRegExpMacroAssembler { + public: + RegExpMacroAssemblerARM64(Mode mode, int registers_to_save, Zone* zone); + virtual ~RegExpMacroAssemblerARM64(); + 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); + virtual void CheckCharacters(Vector<const uc16> str, + int cp_offset, + Label* on_failure, + bool check_end_of_string); + // 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(Label* on_not_at_start); + virtual void CheckNotBackReference(int start_reg, Label* on_no_match); + virtual void CheckNotBackReferenceIgnoreCase(int start_reg, + 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); + virtual bool CanReadUnaligned(); + + // 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, + int start_offset, + const byte** input_start, + const byte** input_end); + + private: + // Above the frame pointer - Stored registers and stack passed parameters. + // Callee-saved registers x19-x29, where x29 is the old frame pointer. + static const int kCalleeSavedRegisters = 0; + // Return address. + // It is placed above the 11 callee-saved registers. + static const int kReturnAddress = kCalleeSavedRegisters + 11 * kPointerSize; + static const int kSecondaryReturnAddress = kReturnAddress + kPointerSize; + // Stack parameter placed by caller. + static const int kIsolate = kSecondaryReturnAddress + kPointerSize; + + // Below the frame pointer. + // Register parameters stored by setup code. + static const int kDirectCall = kCalleeSavedRegisters - kPointerSize; + static const int kStackBase = kDirectCall - kPointerSize; + static const int kOutputSize = kStackBase - kPointerSize; + static const int kInput = kOutputSize - kPointerSize; + // When adding local variables remember to push space for them in + // the frame in GetCode. + static const int kSuccessCounter = kInput - kPointerSize; + // First position register address on the stack. Following positions are + // below it. A position is a 32 bit value. + static const int kFirstRegisterOnStack = kSuccessCounter - kWRegSize; + // A capture is a 64 bit value holding two position. + static const int kFirstCaptureOnStack = kSuccessCounter - kXRegSize; + + // Initial size of code buffer. + static const size_t kRegExpCodeSize = 1024; + + // When initializing registers to a non-position value we can unroll + // the loop. Set the limit of registers to unroll. + static const int kNumRegistersToUnroll = 16; + + // We are using x0 to x7 as a register cache. Each hardware register must + // contain one capture, that is two 32 bit registers. We can cache at most + // 16 registers. + static const int kNumCachedRegisters = 16; + + // 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(); + + // Generate a call to CheckStackGuardState. + void CallCheckStackGuardState(Register scratch); + + // Location of a 32 bit position register. + MemOperand register_location(int register_index); + + // Location of a 64 bit capture, combining two position registers. + MemOperand capture_location(int register_index, Register scratch); + + // Register holding the current input position as negative offset from + // the end of the string. + Register current_input_offset() { return w21; } + + // The register containing the current character after LoadCurrentCharacter. + Register current_character() { return w22; } + + // Register holding address of the end of the input string. + Register input_end() { return x25; } + + // Register holding address of the start of the input string. + Register input_start() { return x26; } + + // Register holding the offset from the start of the string where we should + // start matching. + Register start_offset() { return w27; } + + // Pointer to the output array's first element. + Register output_array() { return x28; } + + // Register holding the frame address. Local variables, parameters and + // regexp registers are addressed relative to this. + Register frame_pointer() { return fp; } + + // The register containing the backtrack stack top. Provides a meaningful + // name to the register. + Register backtrack_stackpointer() { return x23; } + + // Register holding pointer to the current code object. + Register code_pointer() { return x20; } + + // Register holding the value used for clearing capture registers. + Register non_position_value() { return w24; } + // The top 32 bit of this register is used to store this value + // twice. This is used for clearing more than one register at a time. + Register twice_non_position_value() { return x24; } + + // Byte size of chars in the string to match (decided by the Mode argument) + int char_size() { return static_cast<int>(mode_); } + + // Equivalent to a conditional branch to the label, unless the label + // is NULL, in which case it is a conditional Backtrack. + void BranchOrBacktrack(Condition condition, Label* to); + + // Compares reg against immmediate before calling BranchOrBacktrack. + // It makes use of the Cbz and Cbnz instructions. + void CompareAndBranchOrBacktrack(Register reg, + int immediate, + Condition condition, + Label* to); + + inline void CallIf(Label* to, Condition condition); + + // Save and restore the link register on the stack in a way that + // is GC-safe. + inline void SaveLinkRegister(); + inline void RestoreLinkRegister(); + + // 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); + + // This state indicates where the register actually is. + enum RegisterState { + STACKED, // Resides in memory. + CACHED_LSW, // Least Significant Word of a 64 bit hardware register. + CACHED_MSW // Most Significant Word of a 64 bit hardware register. + }; + + RegisterState GetRegisterState(int register_index) { + ASSERT(register_index >= 0); + if (register_index >= kNumCachedRegisters) { + return STACKED; + } else { + if ((register_index % 2) == 0) { + return CACHED_LSW; + } else { + return CACHED_MSW; + } + } + } + + // Store helper that takes the state of the register into account. + inline void StoreRegister(int register_index, Register source); + + // Returns a hardware W register that holds the value of the capture + // register. + // + // This function will try to use an existing cache register (w0-w7) for the + // result. Otherwise, it will load the value into maybe_result. + // + // If the returned register is anything other than maybe_result, calling code + // must not write to it. + inline Register GetRegister(int register_index, Register maybe_result); + + // Returns the harware register (x0-x7) holding the value of the capture + // register. + // This assumes that the state of the register is not STACKED. + inline Register GetCachedRegister(int register_index); + + Isolate* isolate() const { return masm_->isolate(); } + + MacroAssembler* masm_; + + // Which mode to generate code for (ASCII 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_; +}; + +#endif // V8_INTERPRETED_REGEXP + + +}} // namespace v8::internal + +#endif // V8_ARM64_REGEXP_MACRO_ASSEMBLER_ARM64_H_ |