1 files changed, 4 insertions, 1 deletions
diff --git a/JavaScriptCore/interpreter/CallFrame.h b/JavaScriptCore/interpreter/CallFrame.h
index 723d4ae..7ea59fb 100644
--- a/JavaScriptCore/interpreter/CallFrame.h
+++ b/JavaScriptCore/interpreter/CallFrame.h
@@ -117,6 +117,7 @@ namespace JSC  {
             CallFrame* callerFrame, int argc, JSObject* callee)
         {
             ASSERT(callerFrame); // Use noCaller() rather than 0 for the outer host call frame caller.
+            ASSERT(callerFrame == noCaller() || callerFrame->removeHostCallFrameFlag()->registerFile()->end() >= this);
 
             setCodeBlock(codeBlock);
             setScopeChain(scopeChain);
@@ -155,7 +156,9 @@ namespace JSC  {
 
     private:
         static const intptr_t HostCallFrameFlag = 1;
-
+#ifndef NDEBUG
+        RegisterFile* registerFile();
+#endif
         ExecState();
         ~ExecState();
     };