* Move irregexp backtrack stack to external memory area, instead of the system stack.

src/regexp-macro-assembler-irregexp.h

 // Copyright 2008 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
@@ skipping 30 matching lines @@
   // If the provided buffer is NULL, the assembler allocates and grows its own
   // buffer, and buffer_size determines the initial buffer size. The buffer is
   // owned by the assembler and deallocated upon destruction of the assembler.
   //
   // If the provided buffer is not NULL, the assembler uses the provided buffer
   // for code generation and assumes its size to be buffer_size. If the buffer
   // is too small, a fatal error occurs. No deallocation of the buffer is done
   // upon destruction of the assembler.
   explicit RegExpMacroAssemblerIrregexp(Vector<byte>);
   virtual ~RegExpMacroAssemblerIrregexp();
+  // The byte-code interpreter checks on each push anyway.
+  virtual int stack_limit() { return 1; }
   virtual void Bind(Label* label);
   virtual void EmitOrLink(Label* label);
   virtual void AdvanceCurrentPosition(int by);  // Signed cp change.
   virtual void PopCurrentPosition();
-  virtual void PushCurrentPosition();
+  virtual void PushCurrentPosition(StackCheckFlag check_stack_limit);
   virtual void Backtrack();
   virtual void GoTo(Label* label);
-  virtual void PushBacktrack(Label* label);
+  virtual void PushBacktrack(Label* label, StackCheckFlag check_stack_limit);
   virtual void Succeed();
   virtual void Fail();
   virtual void PopRegister(int register_index);
-  virtual void PushRegister(int register_index);
+  virtual void PushRegister(int register_index,
+                            StackCheckFlag check_stack_limit);
   virtual void AdvanceRegister(int reg, int by);  // r[reg] += by.
   virtual void SetRegister(int register_index, int to);
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
   virtual void ReadCurrentPositionFromRegister(int reg);
   virtual void WriteStackPointerToRegister(int reg);
   virtual void ReadStackPointerFromRegister(int reg);
   virtual void LoadCurrentCharacter(int cp_offset,
                                     Label* on_end_of_input,
                                     bool check_bounds = true,
                                     int characters = 1);
@@ skipping 54 matching lines @@
   // True if the assembler owns the buffer, false if buffer is external.
   bool own_buffer_;
   Label backtrack_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(RegExpMacroAssemblerIrregexp);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGEXP_MACRO_ASSEMBLER_IRREGEXP_H_