Implement $ for non-multiline.

src/jsregexp.h

 // Copyright 2006-2008 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 558 matching lines @@
   RegExpNode* on_success_;
 };
 
 
 class ActionNode: public SeqRegExpNode {
  public:
   enum Type {
     STORE_REGISTER,
     INCREMENT_REGISTER,
     STORE_POSITION,
-    SAVE_POSITION,
     RESTORE_POSITION,
     BEGIN_SUBMATCH,
     ESCAPE_SUBMATCH
   };
   static ActionNode* StoreRegister(int reg, int val, RegExpNode* on_success);
   static ActionNode* IncrementRegister(int reg, RegExpNode* on_success);
   static ActionNode* StorePosition(int reg, RegExpNode* on_success);
-  static ActionNode* SavePosition(int reg, RegExpNode* on_success);
   static ActionNode* RestorePosition(int reg, RegExpNode* on_success);
-  static ActionNode* BeginSubmatch(int reg, RegExpNode* on_success);
-  static ActionNode* EscapeSubmatch(int reg, RegExpNode* on_success);
+  static ActionNode* BeginSubmatch(int stack_pointer_reg,
+                                   int position_reg,
+                                   RegExpNode* on_success);
+  static ActionNode* EscapeSubmatch(int stack_pointer_reg,
+                                    bool and_restore_position,
+                                    int restore_reg,
+                                    RegExpNode* on_success);
   virtual void Accept(NodeVisitor* visitor);
   virtual bool Emit(RegExpCompiler* compiler);
   virtual RegExpNode* PropagateForward(NodeInfo* info);
  private:
   union {
     struct {
       int reg;
       int value;
     } u_store_register;
     struct {
       int reg;
     } u_increment_register;
     struct {
       int reg;
     } u_position_register;
     struct {
-      int reg;
-    } u_submatch_stack_pointer_register;
+      int stack_pointer_register;
+      int current_position_register;
+    } u_submatch;
   } data_;
   ActionNode(Type type, RegExpNode* on_success)
       : SeqRegExpNode(on_success),
         type_(type) { }
   Type type_;
   friend class DotPrinter;
 };
 
 
 class TextNode: public SeqRegExpNode {
@@ skipping 185 matching lines @@
                                     RegExpNode** node_return,
                                     bool ignore_case,
                                     bool multiline);
   static void DotPrint(const char* label, RegExpNode* node);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSREGEXP_H_