Revert of Experimental support for RegExp lookbehind.

src/regexp/regexp-macro-assembler-irregexp.cc

 // Copyright 2008-2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/regexp/regexp-macro-assembler-irregexp.h"
 
 #include "src/ast.h"
 #include "src/regexp/bytecodes-irregexp.h"
 #include "src/regexp/regexp-macro-assembler.h"
 #include "src/regexp/regexp-macro-assembler-irregexp-inl.h"
@@ skipping 255 matching lines @@
   EmitOrLink(on_equal);
 }
 
 
 void RegExpMacroAssemblerIrregexp::CheckAtStart(Label* on_at_start) {
   Emit(BC_CHECK_AT_START, 0);
   EmitOrLink(on_at_start);
 }
 
 
-void RegExpMacroAssemblerIrregexp::CheckNotAtStart(int cp_offset,
-                                                   Label* on_not_at_start) {
-  Emit(BC_CHECK_NOT_AT_START, cp_offset);
+void RegExpMacroAssemblerIrregexp::CheckNotAtStart(Label* on_not_at_start) {
+  Emit(BC_CHECK_NOT_AT_START, 0);
   EmitOrLink(on_not_at_start);
 }
 
 
 void RegExpMacroAssemblerIrregexp::CheckNotCharacter(uint32_t c,
                                                      Label* on_not_equal) {
   if (c > MAX_FIRST_ARG) {
     Emit(BC_CHECK_NOT_4_CHARS, 0);
     Emit32(c);
   } else {
@@ skipping 75 matching lines @@
     int byte = 0;
     for (int j = 0; j < kBitsPerByte; j++) {
       if (table->get(i + j) != 0) byte |= 1 << j;
     }
     Emit8(byte);
   }
 }
 
 
 void RegExpMacroAssemblerIrregexp::CheckNotBackReference(int start_reg,
-                                                         bool read_backward,
                                                          Label* on_not_equal) {
   DCHECK(start_reg >= 0);
   DCHECK(start_reg <= kMaxRegister);
-  Emit(read_backward ? BC_CHECK_NOT_BACK_REF_BACKWARD : BC_CHECK_NOT_BACK_REF,
-       start_reg);
+  Emit(BC_CHECK_NOT_BACK_REF, start_reg);
   EmitOrLink(on_not_equal);
 }
 
 
 void RegExpMacroAssemblerIrregexp::CheckNotBackReferenceIgnoreCase(
-    int start_reg, bool read_backward, Label* on_not_equal) {
+    int start_reg,
+    Label* on_not_equal) {
   DCHECK(start_reg >= 0);
   DCHECK(start_reg <= kMaxRegister);
-  Emit(read_backward ? BC_CHECK_NOT_BACK_REF_NO_CASE_BACKWARD
-                     : BC_CHECK_NOT_BACK_REF_NO_CASE,
-       start_reg);
+  Emit(BC_CHECK_NOT_BACK_REF_NO_CASE, start_reg);
   EmitOrLink(on_not_equal);
 }
 
 
 void RegExpMacroAssemblerIrregexp::IfRegisterLT(int register_index,
                                                 int comparand,
                                                 Label* on_less_than) {
   DCHECK(register_index >= 0);
   DCHECK(register_index <= kMaxRegister);
   Emit(BC_CHECK_REGISTER_LT, register_index);
@@ skipping 50 matching lines @@
   MemCopy(buffer_.start(), old_buffer.start(), old_buffer.length());
   if (old_buffer_was_our_own) {
     old_buffer.Dispose();
   }
 }
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }  // namespace internal
 }  // namespace v8