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

src/regexp-macro-assembler-ia32.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 144 matching lines @@
   BranchOrBacktrack(equal, on_equal);
 }
 
 
 void RegExpMacroAssemblerIA32::CheckCharacterGT(uc16 limit, Label* on_greater) {
   __ cmp(edx, limit);
   BranchOrBacktrack(greater, on_greater);
 }
 
 
+void RegExpMacroAssemblerIA32::CheckNotAtStart(Label* on_not_at_start) {
+  UNIMPLEMENTED();
+}
+
+
 void RegExpMacroAssemblerIA32::CheckCharacterLT(uc16 limit, Label* on_less) {
   __ cmp(edx, limit);
   BranchOrBacktrack(less, on_less);
 }
 
 
 void RegExpMacroAssemblerIA32::CheckCharacters(Vector<const uc16> str,
                                                int cp_offset,
                                                Label* on_failure) {
   int byte_length = str.length() * char_size();
@@ skipping 467 matching lines @@
 
 
 void RegExpMacroAssemblerIA32::LoadConstantBufferAddress(Register reg,
                                                          ArraySlice* buffer) {
   __ mov(reg, buffer->array());
   __ add(Operand(reg), Immediate(buffer->base_offset()));
 }
 
 #undef __
 }}  // namespace v8::internal