LCOV - code coverage report
Current view: top level - src/regexp/x64 - regexp-macro-assembler-x64.h (source / functions) Hit Total Coverage
Test: app.info Lines: 5 5 100.0 %
Date: 2017-04-26 Functions: 1 1 100.0 %

          Line data    Source code
       1             : // Copyright 2012 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
       6             : #define V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_
       7             : 
       8             : #include "src/macro-assembler.h"
       9             : #include "src/regexp/regexp-macro-assembler.h"
      10             : #include "src/x64/assembler-x64.h"
      11             : 
      12             : namespace v8 {
      13             : namespace internal {
      14             : 
      15             : #ifndef V8_INTERPRETED_REGEXP
      16             : 
      17             : class RegExpMacroAssemblerX64: public NativeRegExpMacroAssembler {
      18             :  public:
      19             :   RegExpMacroAssemblerX64(Isolate* isolate, Zone* zone, Mode mode,
      20             :                           int registers_to_save);
      21             :   virtual ~RegExpMacroAssemblerX64();
      22             :   virtual int stack_limit_slack();
      23             :   virtual void AdvanceCurrentPosition(int by);
      24             :   virtual void AdvanceRegister(int reg, int by);
      25             :   virtual void Backtrack();
      26             :   virtual void Bind(Label* label);
      27             :   virtual void CheckAtStart(Label* on_at_start);
      28             :   virtual void CheckCharacter(uint32_t c, Label* on_equal);
      29             :   virtual void CheckCharacterAfterAnd(uint32_t c,
      30             :                                       uint32_t mask,
      31             :                                       Label* on_equal);
      32             :   virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
      33             :   virtual void CheckCharacterLT(uc16 limit, Label* on_less);
      34             :   // A "greedy loop" is a loop that is both greedy and with a simple
      35             :   // body. It has a particularly simple implementation.
      36             :   virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
      37             :   virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
      38             :   virtual void CheckNotBackReference(int start_reg, bool read_backward,
      39             :                                      Label* on_no_match);
      40             :   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
      41             :                                                bool read_backward, bool unicode,
      42             :                                                Label* on_no_match);
      43             :   virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal);
      44             :   virtual void CheckNotCharacterAfterAnd(uint32_t c,
      45             :                                          uint32_t mask,
      46             :                                          Label* on_not_equal);
      47             :   virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
      48             :                                               uc16 minus,
      49             :                                               uc16 mask,
      50             :                                               Label* on_not_equal);
      51             :   virtual void CheckCharacterInRange(uc16 from,
      52             :                                      uc16 to,
      53             :                                      Label* on_in_range);
      54             :   virtual void CheckCharacterNotInRange(uc16 from,
      55             :                                         uc16 to,
      56             :                                         Label* on_not_in_range);
      57             :   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
      58             : 
      59             :   // Checks whether the given offset from the current position is before
      60             :   // the end of the string.
      61             :   virtual void CheckPosition(int cp_offset, Label* on_outside_input);
      62             :   virtual bool CheckSpecialCharacterClass(uc16 type,
      63             :                                           Label* on_no_match);
      64             :   virtual void Fail();
      65             :   virtual Handle<HeapObject> GetCode(Handle<String> source);
      66             :   virtual void GoTo(Label* label);
      67             :   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
      68             :   virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
      69             :   virtual void IfRegisterEqPos(int reg, Label* if_eq);
      70             :   virtual IrregexpImplementation Implementation();
      71             :   virtual void LoadCurrentCharacter(int cp_offset,
      72             :                                     Label* on_end_of_input,
      73             :                                     bool check_bounds = true,
      74             :                                     int characters = 1);
      75             :   virtual void PopCurrentPosition();
      76             :   virtual void PopRegister(int register_index);
      77             :   virtual void PushBacktrack(Label* label);
      78             :   virtual void PushCurrentPosition();
      79             :   virtual void PushRegister(int register_index,
      80             :                             StackCheckFlag check_stack_limit);
      81             :   virtual void ReadCurrentPositionFromRegister(int reg);
      82             :   virtual void ReadStackPointerFromRegister(int reg);
      83             :   virtual void SetCurrentPositionFromEnd(int by);
      84             :   virtual void SetRegister(int register_index, int to);
      85             :   virtual bool Succeed();
      86             :   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
      87             :   virtual void ClearRegisters(int reg_from, int reg_to);
      88             :   virtual void WriteStackPointerToRegister(int reg);
      89             : 
      90             :   static Result Match(Handle<Code> regexp,
      91             :                       Handle<String> subject,
      92             :                       int* offsets_vector,
      93             :                       int offsets_vector_length,
      94             :                       int previous_index,
      95             :                       Isolate* isolate);
      96             : 
      97             :   static Result Execute(Code* code,
      98             :                         String* input,
      99             :                         int start_offset,
     100             :                         const byte* input_start,
     101             :                         const byte* input_end,
     102             :                         int* output,
     103             :                         bool at_start);
     104             : 
     105             :   // Called from RegExp if the stack-guard is triggered.
     106             :   // If the code object is relocated, the return address is fixed before
     107             :   // returning.
     108             :   static int CheckStackGuardState(Address* return_address,
     109             :                                   Code* re_code,
     110             :                                   Address re_frame);
     111             : 
     112             :  private:
     113             :   // Offsets from rbp of function parameters and stored registers.
     114             :   static const int kFramePointer = 0;
     115             :   // Above the frame pointer - function parameters and return address.
     116             :   static const int kReturn_eip = kFramePointer + kRegisterSize;
     117             :   static const int kFrameAlign = kReturn_eip + kRegisterSize;
     118             : 
     119             : #ifdef _WIN64
     120             :   // Parameters (first four passed as registers, but with room on stack).
     121             :   // In Microsoft 64-bit Calling Convention, there is room on the callers
     122             :   // stack (before the return address) to spill parameter registers. We
     123             :   // use this space to store the register passed parameters.
     124             :   static const int kInputString = kFrameAlign;
     125             :   // StartIndex is passed as 32 bit int.
     126             :   static const int kStartIndex = kInputString + kRegisterSize;
     127             :   static const int kInputStart = kStartIndex + kRegisterSize;
     128             :   static const int kInputEnd = kInputStart + kRegisterSize;
     129             :   static const int kRegisterOutput = kInputEnd + kRegisterSize;
     130             :   // For the case of global regular expression, we have room to store at least
     131             :   // one set of capture results.  For the case of non-global regexp, we ignore
     132             :   // this value. NumOutputRegisters is passed as 32-bit value.  The upper
     133             :   // 32 bit of this 64-bit stack slot may contain garbage.
     134             :   static const int kNumOutputRegisters = kRegisterOutput + kRegisterSize;
     135             :   static const int kStackHighEnd = kNumOutputRegisters + kRegisterSize;
     136             :   // DirectCall is passed as 32 bit int (values 0 or 1).
     137             :   static const int kDirectCall = kStackHighEnd + kRegisterSize;
     138             :   static const int kIsolate = kDirectCall + kRegisterSize;
     139             : #else
     140             :   // In AMD64 ABI Calling Convention, the first six integer parameters
     141             :   // are passed as registers, and caller must allocate space on the stack
     142             :   // if it wants them stored. We push the parameters after the frame pointer.
     143             :   static const int kInputString = kFramePointer - kRegisterSize;
     144             :   static const int kStartIndex = kInputString - kRegisterSize;
     145             :   static const int kInputStart = kStartIndex - kRegisterSize;
     146             :   static const int kInputEnd = kInputStart - kRegisterSize;
     147             :   static const int kRegisterOutput = kInputEnd - kRegisterSize;
     148             : 
     149             :   // For the case of global regular expression, we have room to store at least
     150             :   // one set of capture results.  For the case of non-global regexp, we ignore
     151             :   // this value.
     152             :   static const int kNumOutputRegisters = kRegisterOutput - kRegisterSize;
     153             :   static const int kStackHighEnd = kFrameAlign;
     154             :   static const int kDirectCall = kStackHighEnd + kRegisterSize;
     155             :   static const int kIsolate = kDirectCall + kRegisterSize;
     156             : #endif
     157             : 
     158             : #ifdef _WIN64
     159             :   // Microsoft calling convention has three callee-saved registers
     160             :   // (that we are using). We push these after the frame pointer.
     161             :   static const int kBackup_rsi = kFramePointer - kRegisterSize;
     162             :   static const int kBackup_rdi = kBackup_rsi - kRegisterSize;
     163             :   static const int kBackup_rbx = kBackup_rdi - kRegisterSize;
     164             :   static const int kLastCalleeSaveRegister = kBackup_rbx;
     165             : #else
     166             :   // AMD64 Calling Convention has only one callee-save register that
     167             :   // we use. We push this after the frame pointer (and after the
     168             :   // parameters).
     169             :   static const int kBackup_rbx = kNumOutputRegisters - kRegisterSize;
     170             :   static const int kLastCalleeSaveRegister = kBackup_rbx;
     171             : #endif
     172             : 
     173             :   static const int kSuccessfulCaptures = kLastCalleeSaveRegister - kPointerSize;
     174             :   // When adding local variables remember to push space for them in
     175             :   // the frame in GetCode.
     176             :   static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
     177             : 
     178             :   // First register address. Following registers are below it on the stack.
     179             :   static const int kRegisterZero = kStringStartMinusOne - kPointerSize;
     180             : 
     181             :   // Initial size of code buffer.
     182             :   static const size_t kRegExpCodeSize = 1024;
     183             : 
     184             :   // Load a number of characters at the given offset from the
     185             :   // current position, into the current-character register.
     186             :   void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
     187             : 
     188             :   // Check whether preemption has been requested.
     189             :   void CheckPreemption();
     190             : 
     191             :   // Check whether we are exceeding the stack limit on the backtrack stack.
     192             :   void CheckStackLimit();
     193             : 
     194             :   // Generate a call to CheckStackGuardState.
     195             :   void CallCheckStackGuardState();
     196             : 
     197             :   // The rbp-relative location of a regexp register.
     198             :   Operand register_location(int register_index);
     199             : 
     200             :   // The register containing the current character after LoadCurrentCharacter.
     201             :   inline Register current_character() { return rdx; }
     202             : 
     203             :   // The register containing the backtrack stack top. Provides a meaningful
     204             :   // name to the register.
     205             :   inline Register backtrack_stackpointer() { return rcx; }
     206             : 
     207             :   // The registers containing a self pointer to this code's Code object.
     208             :   inline Register code_object_pointer() { return r8; }
     209             : 
     210             :   // Byte size of chars in the string to match (decided by the Mode argument)
     211     1508819 :   inline int char_size() { return static_cast<int>(mode_); }
     212             : 
     213             :   // Equivalent to a conditional branch to the label, unless the label
     214             :   // is NULL, in which case it is a conditional Backtrack.
     215             :   void BranchOrBacktrack(Condition condition, Label* to);
     216             : 
     217      687543 :   void MarkPositionForCodeRelativeFixup() {
     218     2062629 :     code_relative_fixup_positions_.Add(masm_.pc_offset(), zone());
     219      687543 :   }
     220             : 
     221             :   void FixupCodeRelativePositions();
     222             : 
     223             :   // Call and return internally in the generated code in a way that
     224             :   // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
     225             :   inline void SafeCall(Label* to);
     226             :   inline void SafeCallTarget(Label* label);
     227             :   inline void SafeReturn();
     228             : 
     229             :   // Pushes the value of a register on the backtrack stack. Decrements the
     230             :   // stack pointer (rcx) by a word size and stores the register's value there.
     231             :   inline void Push(Register source);
     232             : 
     233             :   // Pushes a value on the backtrack stack. Decrements the stack pointer (rcx)
     234             :   // by a word size and stores the value there.
     235             :   inline void Push(Immediate value);
     236             : 
     237             :   // Pushes the Code object relative offset of a label on the backtrack stack
     238             :   // (i.e., a backtrack target). Decrements the stack pointer (rcx)
     239             :   // by a word size and stores the value there.
     240             :   inline void Push(Label* label);
     241             : 
     242             :   // Pops a value from the backtrack stack. Reads the word at the stack pointer
     243             :   // (rcx) and increments it by a word size.
     244             :   inline void Pop(Register target);
     245             : 
     246             :   // Drops the top value from the backtrack stack without reading it.
     247             :   // Increments the stack pointer (rcx) by a word size.
     248             :   inline void Drop();
     249             : 
     250             :   inline void ReadPositionFromRegister(Register dst, int reg);
     251             : 
     252     1482904 :   Isolate* isolate() const { return masm_.isolate(); }
     253             : 
     254             :   MacroAssembler masm_;
     255             :   MacroAssembler::NoRootArrayScope no_root_array_scope_;
     256             : 
     257             :   ZoneList<int> code_relative_fixup_positions_;
     258             : 
     259             :   // Which mode to generate code for (LATIN1 or UC16).
     260             :   Mode mode_;
     261             : 
     262             :   // One greater than maximal register index actually used.
     263             :   int num_registers_;
     264             : 
     265             :   // Number of registers to output at the end (the saved registers
     266             :   // are always 0..num_saved_registers_-1)
     267             :   int num_saved_registers_;
     268             : 
     269             :   // Labels used internally.
     270             :   Label entry_label_;
     271             :   Label start_label_;
     272             :   Label success_label_;
     273             :   Label backtrack_label_;
     274             :   Label exit_label_;
     275             :   Label check_preempt_label_;
     276             :   Label stack_overflow_label_;
     277             : };
     278             : 
     279             : #endif  // V8_INTERPRETED_REGEXP
     280             : 
     281             : }  // namespace internal
     282             : }  // namespace v8
     283             : 
     284             : #endif  // V8_REGEXP_X64_REGEXP_MACRO_ASSEMBLER_X64_H_

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