Added stack overflow check for RegExp analysis phase.

src/jsregexp.h

Index: src/jsregexp.h
diff --git a/src/jsregexp.h b/src/jsregexp.h
index 18bd19b44c456ad72ce8f7c54c2a309a965eddc5..1b13b43fec365cb24d1d8bf8d79c16c64346eb05 100644
--- a/src/jsregexp.h
+++ b/src/jsregexp.h
@@ -1310,7 +1310,7 @@ FOR_EACH_NODE_TYPE(DECLARE_VISIT)
 class Analysis: public NodeVisitor {
  public:
   explicit Analysis(bool ignore_case)
-      : ignore_case_(ignore_case) { }
+      : ignore_case_(ignore_case), error_message_(NULL) { }
   void EnsureAnalyzed(RegExpNode* node);
 
 #define DECLARE_VISIT(Type)                                          \
@@ -1319,8 +1319,17 @@ FOR_EACH_NODE_TYPE(DECLARE_VISIT)
 #undef DECLARE_VISIT
   virtual void VisitLoopChoice(LoopChoiceNode* that);
 
+  bool failed() { return error_message_ != NULL; }

[Christian Plesner Hansen, 2009/05/27 10:04:48]

Since this is a boolean predicate it should be 'has_failed'.

+  const char* error_message() {
+    ASSERT(error_message_ != NULL);
+    return error_message_;
+  }
+  void fail(const char* error_message) {
+    error_message_ = error_message;
+  }
  private:
   bool ignore_case_;
+  const char* error_message_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Analysis);
 };