Limit end-anchored regexps to testing end of string where possible.

src/ast.h

 // Copyright 2010 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 1505 matching lines @@
 
 
 class RegExpTree: public ZoneObject {
  public:
   static const int kInfinity = kMaxInt;
   virtual ~RegExpTree() { }
   virtual void* Accept(RegExpVisitor* visitor, void* data) = 0;
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success) = 0;
   virtual bool IsTextElement() { return false; }
-  virtual bool IsAnchored() { return false; }
+  virtual bool IsAnchoredAtStart() { return false; }
+  virtual bool IsAnchoredAtEnd() { return false; }
   virtual int min_match() = 0;
   virtual int max_match() = 0;
   // Returns the interval of registers used for captures within this
   // expression.
   virtual Interval CaptureRegisters() { return Interval::Empty(); }
   virtual void AppendToText(RegExpText* text);
   SmartPointer<const char> ToString();
 #define MAKE_ASTYPE(Name)                                                  \
   virtual RegExp##Name* As##Name();                                        \
   virtual bool Is##Name();
   FOR_EACH_REG_EXP_TREE_TYPE(MAKE_ASTYPE)
 #undef MAKE_ASTYPE
 };
 
 
 class RegExpDisjunction: public RegExpTree {
  public:
   explicit RegExpDisjunction(ZoneList<RegExpTree*>* alternatives);
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpDisjunction* AsDisjunction();
   virtual Interval CaptureRegisters();
   virtual bool IsDisjunction();
-  virtual bool IsAnchored();
+  virtual bool IsAnchoredAtStart();
+  virtual bool IsAnchoredAtEnd();
   virtual int min_match() { return min_match_; }
   virtual int max_match() { return max_match_; }
   ZoneList<RegExpTree*>* alternatives() { return alternatives_; }
  private:
   ZoneList<RegExpTree*>* alternatives_;
   int min_match_;
   int max_match_;
 };
 
 
 class RegExpAlternative: public RegExpTree {
  public:
   explicit RegExpAlternative(ZoneList<RegExpTree*>* nodes);
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpAlternative* AsAlternative();
   virtual Interval CaptureRegisters();
   virtual bool IsAlternative();
-  virtual bool IsAnchored();
+  virtual bool IsAnchoredAtStart();
+  virtual bool IsAnchoredAtEnd();
   virtual int min_match() { return min_match_; }
   virtual int max_match() { return max_match_; }
   ZoneList<RegExpTree*>* nodes() { return nodes_; }
  private:
   ZoneList<RegExpTree*>* nodes_;
   int min_match_;
   int max_match_;
 };
 
 
 class RegExpAssertion: public RegExpTree {
  public:
   enum Type {
     START_OF_LINE,
     START_OF_INPUT,
     END_OF_LINE,
     END_OF_INPUT,
     BOUNDARY,
     NON_BOUNDARY
   };
   explicit RegExpAssertion(Type type) : type_(type) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpAssertion* AsAssertion();
   virtual bool IsAssertion();
-  virtual bool IsAnchored();
+  virtual bool IsAnchoredAtStart();
+  virtual bool IsAnchoredAtEnd();
   virtual int min_match() { return 0; }
   virtual int max_match() { return 0; }
   Type type() { return type_; }
  private:
   Type type_;
 };
 
 
 class CharacterSet BASE_EMBEDDED {
  public:
@@ skipping 152 matching lines @@
   explicit RegExpCapture(RegExpTree* body, int index)
       : body_(body), index_(index) { }
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   static RegExpNode* ToNode(RegExpTree* body,
                             int index,
                             RegExpCompiler* compiler,
                             RegExpNode* on_success);
   virtual RegExpCapture* AsCapture();
-  virtual bool IsAnchored();
+  virtual bool IsAnchoredAtStart();
+  virtual bool IsAnchoredAtEnd();
   virtual Interval CaptureRegisters();
   virtual bool IsCapture();
   virtual int min_match() { return body_->min_match(); }
   virtual int max_match() { return body_->max_match(); }
   RegExpTree* body() { return body_; }
   int index() { return index_; }
   static int StartRegister(int index) { return index * 2; }
   static int EndRegister(int index) { return index * 2 + 1; }
  private:
   RegExpTree* body_;
@@ skipping 11 matching lines @@
         is_positive_(is_positive),
         capture_count_(capture_count),
         capture_from_(capture_from) { }
 
   virtual void* Accept(RegExpVisitor* visitor, void* data);
   virtual RegExpNode* ToNode(RegExpCompiler* compiler,
                              RegExpNode* on_success);
   virtual RegExpLookahead* AsLookahead();
   virtual Interval CaptureRegisters();
   virtual bool IsLookahead();
-  virtual bool IsAnchored();
+  virtual bool IsAnchoredAtStart();
   virtual int min_match() { return 0; }
   virtual int max_match() { return 0; }
   RegExpTree* body() { return body_; }
   bool is_positive() { return is_positive_; }
   int capture_count() { return capture_count_; }
   int capture_from() { return capture_from_; }
  private:
   RegExpTree* body_;
   bool is_positive_;
   int capture_count_;
@@ skipping 67 matching lines @@
   AST_NODE_LIST(DEF_VISIT)
 #undef DEF_VISIT
 
  private:
   bool stack_overflow_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_AST_H_