Check for empty repetitions.

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 88 matching lines @@
                                      Label* half_nibble_map,
                                      const Vector<Label*>& destinations);
   virtual void DispatchByteMap(uc16 start,
                                Label* byte_map,
                                const Vector<Label*>& destinations);
   virtual void DispatchHighByteMap(byte start,
                                    Label* byte_map,
                                    const Vector<Label*>& destinations);
   virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt);
   virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge);
+  virtual void IfRegisterEqPos(int register_index, Label* if_eq);
 
   virtual IrregexpImplementation Implementation();
   virtual Handle<Object> GetCode(Handle<String> source);
  private:
   void Expand();
   // Code and bitmap emission.
   inline void Emit32(uint32_t x);
   inline void Emit16(uint32_t x);
   inline void Emit(uint32_t x);
   // Bytecode buffer.
   int length();
   void Copy(Address a);
 
   // The buffer into which code and relocation info are generated.
   Vector<byte> buffer_;
   // The program counter.
   int pc_;
   // 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_