Port regexp fix (backslash-b at end of input) to

src/jsregexp.cc

 // Copyright 2006-2009 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 4852 matching lines @@
   if (type == AssertionNode::AT_BOUNDARY ||
       type == AssertionNode::AT_NON_BOUNDARY) {
     // Check if the following character is known to be a word character
     // or known to not be a word character.
     ZoneList<CharacterRange>* following_chars = that->FirstCharacterSet();
 
     CharacterRange::Canonicalize(following_chars);
 
     SetRelation word_relation =
         CharacterRange::WordCharacterRelation(following_chars);
-    if (word_relation.ContainedIn()) {
+    if (word_relation.Disjoint()) {
+      // Includes the case where following_chars is empty (e.g., end-of-input).
+      // Following character is definitely *not* a word character.
+      type = (type == AssertionNode::AT_BOUNDARY) ?
+                 AssertionNode::AFTER_WORD_CHARACTER :
+                 AssertionNode::AFTER_NONWORD_CHARACTER;
+      that->set_type(type);
+    } else if (word_relation.ContainedIn()) {
       // Following character is definitely a word character.
       type = (type == AssertionNode::AT_BOUNDARY) ?
-                  AssertionNode::AFTER_NONWORD_CHARACTER :
-                  AssertionNode::AFTER_WORD_CHARACTER;
-      that->set_type(type);
-    } else if (word_relation.Disjoint()) {
-      // Following character is definitely *not* a word character.
-      type = (type == AssertionNode::AT_BOUNDARY) ?
-                  AssertionNode::AFTER_WORD_CHARACTER :
-                  AssertionNode::AFTER_NONWORD_CHARACTER;
+                 AssertionNode::AFTER_NONWORD_CHARACTER :
+                 AssertionNode::AFTER_WORD_CHARACTER;
       that->set_type(type);
     }
   }
 }
 
 
 ZoneList<CharacterRange>* RegExpNode::FirstCharacterSet() {
   if (first_character_set_ == NULL) {
     if (ComputeFirstCharacterSet(kFirstCharBudget) < 0) {
       // If we can't find an exact solution within the budget, we
@@ skipping 352 matching lines @@
                            node,
                            data->capture_count,
                            pattern);
 }
 
 
 int OffsetsVector::static_offsets_vector_[
     OffsetsVector::kStaticOffsetsVectorSize];
 
 }}  // namespace v8::internal