* Irregexp: Handle backtrack past look-ahead.

src/regexp-macro-assembler-tracer.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 132 matching lines @@
 
 void RegExpMacroAssemblerTracer::WriteCurrentPositionToRegister(int reg,
                                                                 int cp_offset) {
   PrintF(" WriteCurrentPositionToRegister(register=%d,cp_offset=%d);\n",
          reg,
          cp_offset);
   assembler_->WriteCurrentPositionToRegister(reg, cp_offset);
 }
 
 
-void RegExpMacroAssemblerTracer::ClearRegister(int reg) {
-  PrintF(" ClearRegister(register=%d);\n", reg);
-  assembler_->ClearRegister(reg);
+void RegExpMacroAssemblerTracer::ClearRegisters(int reg_from, int reg_to) {
+  PrintF(" ClearRegister(from=%d, to=%d);\n", reg_from, reg_to);
+  assembler_->ClearRegisters(reg_from, reg_to);
 }
 
 
 void RegExpMacroAssemblerTracer::ReadCurrentPositionFromRegister(int reg) {
   PrintF(" ReadCurrentPositionFromRegister(register=%d);\n", reg);
   assembler_->ReadCurrentPositionFromRegister(reg);
 }
 
 
 void RegExpMacroAssemblerTracer::WriteStackPointerToRegister(int reg) {
@@ skipping 245 matching lines @@
   return assembler_->Implementation();
 }
 
 
 Handle<Object> RegExpMacroAssemblerTracer::GetCode(Handle<String> source) {
   PrintF(" GetCode(%s);\n", *(source->ToCString()));
   return assembler_->GetCode(source);
 }
 
 }}  // namespace v8::internal