Experimental support for RegExp lookbehind.

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

Index: src/regexp/regexp-macro-assembler-irregexp.h
diff --git a/src/regexp/regexp-macro-assembler-irregexp.h b/src/regexp/regexp-macro-assembler-irregexp.h
index bbfe5203d93787dfb245901f403e4739ffbea290..f1ace63a74ce355cc723d0369af4c8db7cbafa40 100644
--- a/src/regexp/regexp-macro-assembler-irregexp.h
+++ b/src/regexp/regexp-macro-assembler-irregexp.h
@@ -66,7 +66,7 @@ class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {
   virtual void CheckCharacterLT(uc16 limit, Label* on_less);
   virtual void CheckGreedyLoop(Label* on_tos_equals_current_position);
   virtual void CheckAtStart(Label* on_at_start);
-  virtual void CheckNotAtStart(Label* on_not_at_start);
+  virtual void CheckNotAtStart(int cp_offset, Label* on_not_at_start);
   virtual void CheckNotCharacter(unsigned c, Label* on_not_equal);
   virtual void CheckNotCharacterAfterAnd(unsigned c,
                                          unsigned mask,
@@ -82,8 +82,10 @@ class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {
                                         uc16 to,
                                         Label* on_not_in_range);
   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
-  virtual void CheckNotBackReference(int start_reg, Label* on_no_match);
+  virtual void CheckNotBackReference(int start_reg, bool read_backward,
+                                     Label* on_no_match);
   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
+                                               bool read_backward,
                                                Label* on_no_match);
   virtual void IfRegisterLT(int register_index, int comparand, Label* if_lt);
   virtual void IfRegisterGE(int register_index, int comparand, Label* if_ge);