Add an operation that checks whether we are at the start of the string.

src/regexp-macro-assembler-irregexp.cc

 // 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 208 matching lines @@
 }
 
 
 void RegExpMacroAssemblerIrregexp::CheckCharacter(uc16 c, Label* on_equal) {
   Emit(BC_CHECK_CHAR);
   Emit16(c);
   EmitOrLink(on_equal);
 }
 
 
+void RegExpMacroAssemblerIrregexp::CheckNotAtStart(Label* on_not_at_start) {
+  Emit(BC_CHECK_NOT_AT_START);
+  EmitOrLink(on_not_at_start);
+}
+
+
 void RegExpMacroAssemblerIrregexp::CheckNotCharacter(uc16 c,
                                                      Label* on_not_equal) {
   Emit(BC_CHECK_NOT_CHAR);
   Emit16(c);
   EmitOrLink(on_not_equal);
 }
 
 
 void RegExpMacroAssemblerIrregexp::CheckNotCharacterAfterOr(
     uc16 c,
@@ skipping 135 matching lines @@
   buffer_ = Vector<byte>::New(old_buffer.length() * 2);
   own_buffer_ = true;
   memcpy(buffer_.start(), old_buffer.start(), old_buffer.length());
   if (old_buffer_was_our_own) {
     old_buffer.Dispose();
   }
 }
 
 
 } }  // namespace v8::internal