Remove some unused stuff from regexp implementation.

src/jsregexp.h

 // Copyright 2012 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 449 matching lines @@
   // character was.
   bool follows_word_interest: 1;
   bool follows_newline_interest: 1;
   bool follows_start_interest: 1;
 
   bool at_end: 1;
   bool visited: 1;
 };
 
 
-class SiblingList {
- public:
-  SiblingList() : list_(NULL) { }
-  int length() {
-    return list_ == NULL ? 0 : list_->length();
-  }
-  void Ensure(RegExpNode* parent) {
-    if (list_ == NULL) {
-      list_ = new ZoneList<RegExpNode*>(2);
-      list_->Add(parent);
-    }
-  }
-  void Add(RegExpNode* node) { list_->Add(node); }
-  RegExpNode* Get(int index) { return list_->at(index); }
- private:
-  ZoneList<RegExpNode*>* list_;
-};
-
-
 // Details of a quick mask-compare check that can look ahead in the
 // input stream.
 class QuickCheckDetails {
  public:
   QuickCheckDetails()
       : characters_(0),
         mask_(0),
         value_(0),
         cannot_match_(false) { }
   explicit QuickCheckDetails(int characters)
@@ skipping 34 matching lines @@
   uint32_t mask_;
   uint32_t value_;
   // If set to true, there is no way this quick check can match at all.
   // E.g., if it requires to be at the start of the input, and isn't.
   bool cannot_match_;
 };
 
 
 class RegExpNode: public ZoneObject {
  public:
-  RegExpNode() : first_character_set_(NULL), trace_count_(0) {
+  RegExpNode() : trace_count_(0) {
     bm_info_[0] = bm_info_[1] = NULL;
   }
   virtual ~RegExpNode();
   virtual void Accept(NodeVisitor* visitor) = 0;
   // Generates a goto to this node or actually generates the code at this point.
   virtual void Emit(RegExpCompiler* compiler, Trace* trace) = 0;
   // How many characters must this node consume at a minimum in order to
   // succeed.  If we have found at least 'still_to_find' characters that
   // must be consumed there is no need to ask any following nodes whether
   // they are sure to eat any more characters.  The not_at_start argument is
@@ skipping 48 matching lines @@
   Label* label() { return &label_; }
   // If non-generic code is generated for a node (i.e. the node is not at the
   // start of the trace) then it cannot be reused.  This variable sets a limit
   // on how often we allow that to happen before we insist on starting a new
   // trace and generating generic code for a node that can be reused by flushing
   // the deferred actions in the current trace and generating a goto.
   static const int kMaxCopiesCodeGenerated = 10;
 
   NodeInfo* info() { return &info_; }
 
-  void AddSibling(RegExpNode* node) { siblings_.Add(node); }
-
-  // Static version of EnsureSibling that expresses the fact that the
-  // result has the same type as the input.
-  template <class C>
-  static C* EnsureSibling(C* node, NodeInfo* info, bool* cloned) {
-    return static_cast<C*>(node->EnsureSibling(info, cloned));
-  }
-
-  SiblingList* siblings() { return &siblings_; }
-  void set_siblings(SiblingList* other) { siblings_ = *other; }
-
-  // Get and set the cached first character set value.
-  ZoneList<CharacterRange>* first_character_set() {
-    return first_character_set_;
-  }
-  void set_first_character_set(ZoneList<CharacterRange>* character_set) {
-    first_character_set_ = character_set;
-  }
   BoyerMooreLookahead* bm_info(bool not_at_start) {
     return bm_info_[not_at_start ? 1 : 0];
   }
 
  protected:
   enum LimitResult { DONE, CONTINUE };
-  static const int kComputeFirstCharacterSetFail = -1;
 
   LimitResult LimitVersions(RegExpCompiler* compiler, Trace* trace);
 
-  // Returns a sibling of this node whose interests and assumptions
-  // match the ones in the given node info.  If no sibling exists NULL
-  // is returned.
-  RegExpNode* TryGetSibling(NodeInfo* info);
-
-  // Returns a sibling of this node whose interests match the ones in
-  // the given node info.  The info must not contain any assertions.
-  // If no node exists a new one will be created by cloning the current
-  // node.  The result will always be an instance of the same concrete
-  // class as this node.
-  RegExpNode* EnsureSibling(NodeInfo* info, bool* cloned);
-
   // Returns a clone of this node initialized using the copy constructor
   // of its concrete class.  Note that the node may have to be pre-
   // processed before it is on a usable state.
   virtual RegExpNode* Clone() = 0;
 
   void set_bm_info(bool not_at_start, BoyerMooreLookahead* bm) {
     bm_info_[not_at_start ? 1 : 0] = bm;
   }
 
  private:
   static const int kFirstCharBudget = 10;
   Label label_;
   NodeInfo info_;
-  SiblingList siblings_;
-  ZoneList<CharacterRange>* first_character_set_;
   // This variable keeps track of how many times code has been generated for
   // this node (in different traces).  We don't keep track of where the
   // generated code is located unless the code is generated at the start of
   // a trace, in which case it is generic and can be reused by flushing the
   // deferred operations in the current trace and generating a goto.
   int trace_count_;
   BoyerMooreLookahead* bm_info_[2];
 };
 
 
@@ skipping 940 matching lines @@
   int* vector_;
   int offsets_vector_length_;
 
   friend class ExternalReference;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSREGEXP_H_