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      1 // Copyright 2015 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_S390_REGEXP_MACRO_ASSEMBLER_S390_H_
      6 #define V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_
      7 
      8 #include "src/macro-assembler.h"
      9 #include "src/regexp/regexp-macro-assembler.h"
     10 #include "src/s390/assembler-s390.h"
     11 #include "src/s390/frames-s390.h"
     12 
     13 namespace v8 {
     14 namespace internal {
     15 
     16 #ifndef V8_INTERPRETED_REGEXP
     17 class RegExpMacroAssemblerS390 : public NativeRegExpMacroAssembler {
     18  public:
     19   RegExpMacroAssemblerS390(Isolate* isolate, Zone* zone, Mode mode,
     20                            int registers_to_save);
     21   virtual ~RegExpMacroAssemblerS390();
     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(unsigned c, Label* on_equal);
     29   virtual void CheckCharacterAfterAnd(unsigned c, unsigned mask,
     30                                       Label* on_equal);
     31   virtual void CheckCharacterGT(uc16 limit, Label* on_greater);
     32   virtual void CheckCharacterLT(uc16 limit, Label* on_less);
     33   // A "greedy loop" is a loop that is both greedy and with a simple
     34   // body. It has a particularly simple implementation.
     35   virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
     36   virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
     37   virtual void CheckNotBackReference(int start_reg, bool read_backward,
     38                                      Label* on_no_match);
     39   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
     40                                                bool read_backward, bool unicode,
     41                                                Label* on_no_match);
     42   virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
     43   virtual void CheckNotCharacterAfterAnd(unsigned c, unsigned mask,
     44                                          Label* on_not_equal);
     45   virtual void CheckNotCharacterAfterMinusAnd(uc16 c, uc16 minus, uc16 mask,
     46                                               Label* on_not_equal);
     47   virtual void CheckCharacterInRange(uc16 from, uc16 to, Label* on_in_range);
     48   virtual void CheckCharacterNotInRange(uc16 from, uc16 to,
     49                                         Label* on_not_in_range);
     50   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
     51 
     52   // Checks whether the given offset from the current position is before
     53   // the end of the string.
     54   virtual void CheckPosition(int cp_offset, Label* on_outside_input);
     55   virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match);
     56   virtual void Fail();
     57   virtual Handle<HeapObject> GetCode(Handle<String> source);
     58   virtual void GoTo(Label* label);
     59   virtual void IfRegisterGE(int reg, int comparand, Label* if_ge);
     60   virtual void IfRegisterLT(int reg, int comparand, Label* if_lt);
     61   virtual void IfRegisterEqPos(int reg, Label* if_eq);
     62   virtual IrregexpImplementation Implementation();
     63   virtual void LoadCurrentCharacter(int cp_offset, Label* on_end_of_input,
     64                                     bool check_bounds = true,
     65                                     int characters = 1);
     66   virtual void PopCurrentPosition();
     67   virtual void PopRegister(int register_index);
     68   virtual void PushBacktrack(Label* label);
     69   virtual void PushCurrentPosition();
     70   virtual void PushRegister(int register_index,
     71                             StackCheckFlag check_stack_limit);
     72   virtual void ReadCurrentPositionFromRegister(int reg);
     73   virtual void ReadStackPointerFromRegister(int reg);
     74   virtual void SetCurrentPositionFromEnd(int by);
     75   virtual void SetRegister(int register_index, int to);
     76   virtual bool Succeed();
     77   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
     78   virtual void ClearRegisters(int reg_from, int reg_to);
     79   virtual void WriteStackPointerToRegister(int reg);
     80 
     81   // Called from RegExp if the stack-guard is triggered.
     82   // If the code object is relocated, the return address is fixed before
     83   // returning.
     84   static int CheckStackGuardState(Address* return_address, Code* re_code,
     85                                   Address re_frame);
     86 
     87  private:
     88   // Offsets from frame_pointer() of function parameters and stored registers.
     89   static const int kFramePointer = 0;
     90 
     91   // Above the frame pointer - Stored registers and stack passed parameters.
     92   // Register 6-15(sp)
     93   static const int kStoredRegisters = kFramePointer;
     94   static const int kCallerFrame =
     95       kStoredRegisters + kCalleeRegisterSaveAreaSize;
     96   // Stack parameters placed by caller.
     97   static const int kCaptureArraySize = kCallerFrame;
     98   static const int kStackAreaBase = kCallerFrame + kPointerSize;
     99   // kDirectCall again
    100   static const int kSecondaryReturnAddress = kStackAreaBase + 2 * kPointerSize;
    101   static const int kIsolate = kSecondaryReturnAddress + kPointerSize;
    102 
    103   // Below the frame pointer.
    104   // Register parameters stored by setup code.
    105   static const int kDirectCall = kFramePointer - kPointerSize;
    106   static const int kStackHighEnd = kDirectCall - kPointerSize;
    107   static const int kNumOutputRegisters = kStackHighEnd - kPointerSize;
    108   static const int kRegisterOutput = kNumOutputRegisters - kPointerSize;
    109   static const int kInputEnd = kRegisterOutput - kPointerSize;
    110   static const int kInputStart = kInputEnd - kPointerSize;
    111   static const int kStartIndex = kInputStart - kPointerSize;
    112   static const int kInputString = kStartIndex - kPointerSize;
    113   // When adding local variables remember to push space for them in
    114   // the frame in GetCode.
    115   static const int kSuccessfulCaptures = kInputString - kPointerSize;
    116   static const int kStringStartMinusOne = kSuccessfulCaptures - kPointerSize;
    117   // First register address. Following registers are below it on the stack.
    118   static const int kRegisterZero = kStringStartMinusOne - kPointerSize;
    119 
    120   // Initial size of code buffer.
    121   static const size_t kRegExpCodeSize = 1024;
    122 
    123   // Load a number of characters at the given offset from the
    124   // current position, into the current-character register.
    125   void LoadCurrentCharacterUnchecked(int cp_offset, int character_count);
    126 
    127   // Check whether preemption has been requested.
    128   void CheckPreemption();
    129 
    130   // Check whether we are exceeding the stack limit on the backtrack stack.
    131   void CheckStackLimit();
    132   void CallCFunctionUsingStub(ExternalReference function, int num_arguments);
    133 
    134   // Generate a call to CheckStackGuardState.
    135   void CallCheckStackGuardState(Register scratch);
    136 
    137   // The ebp-relative location of a regexp register.
    138   MemOperand register_location(int register_index);
    139 
    140   // Register holding the current input position as negative offset from
    141   // the end of the string.
    142   inline Register current_input_offset() { return r8; }
    143 
    144   // The register containing the current character after LoadCurrentCharacter.
    145   inline Register current_character() { return r9; }
    146 
    147   // Register holding address of the end of the input string.
    148   inline Register end_of_input_address() { return r10; }
    149 
    150   // Register holding the frame address. Local variables, parameters and
    151   // regexp registers are addressed relative to this.
    152   inline Register frame_pointer() { return fp; }
    153 
    154   // The register containing the backtrack stack top. Provides a meaningful
    155   // name to the register.
    156   inline Register backtrack_stackpointer() { return r13; }
    157 
    158   // Register holding pointer to the current code object.
    159   inline Register code_pointer() { return r7; }
    160 
    161   // Byte size of chars in the string to match (decided by the Mode argument)
    162   inline int char_size() { return static_cast<int>(mode_); }
    163 
    164   // Equivalent to a conditional branch to the label, unless the label
    165   // is NULL, in which case it is a conditional Backtrack.
    166   void BranchOrBacktrack(Condition condition, Label* to, CRegister cr = cr7);
    167 
    168   // Call and return internally in the generated code in a way that
    169   // is GC-safe (i.e., doesn't leave absolute code addresses on the stack)
    170   inline void SafeCall(Label* to, Condition cond = al, CRegister cr = cr7);
    171   inline void SafeReturn();
    172   inline void SafeCallTarget(Label* name);
    173 
    174   // Pushes the value of a register on the backtrack stack. Decrements the
    175   // stack pointer by a word size and stores the register's value there.
    176   inline void Push(Register source);
    177 
    178   // Pops a value from the backtrack stack. Reads the word at the stack pointer
    179   // and increments it by a word size.
    180   inline void Pop(Register target);
    181 
    182   Isolate* isolate() const { return masm_->isolate(); }
    183 
    184   MacroAssembler* masm_;
    185 
    186   // Which mode to generate code for (Latin1 or UC16).
    187   Mode mode_;
    188 
    189   // One greater than maximal register index actually used.
    190   int num_registers_;
    191 
    192   // Number of registers to output at the end (the saved registers
    193   // are always 0..num_saved_registers_-1)
    194   int num_saved_registers_;
    195 
    196   // Labels used internally.
    197   Label entry_label_;
    198   Label start_label_;
    199   Label success_label_;
    200   Label backtrack_label_;
    201   Label exit_label_;
    202   Label check_preempt_label_;
    203   Label stack_overflow_label_;
    204   Label internal_failure_label_;
    205 };
    206 
    207 // Set of non-volatile registers saved/restored by generated regexp code.
    208 const RegList kRegExpCalleeSaved =
    209     1 << 6 | 1 << 7 | 1 << 8 | 1 << 9 | 1 << 10 | 1 << 11 | 1 << 13;
    210 
    211 #endif  // V8_INTERPRETED_REGEXP
    212 }  // namespace internal
    213 }  // namespace v8
    214 
    215 #endif  // V8_S390_REGEXP_MACRO_ASSEMBLER_S390_H_
    216