Bug 800878 - EvalInFrame, Check debug mode before iterating the stack. r=luke,decoder

js/src/shell/js.cpp

@@ -2523,6 +2523,13 @@ EvalInFrame(JSContext *cx, unsigned argc, jsval *vp)
 
     JS_ASSERT(cx->hasfp());
 
+    /* This is a copy of CheckDebugMode. */
+    if (!JS_GetDebugMode(cx)) {
+        JS_ReportErrorFlagsAndNumber(cx, JSREPORT_ERROR, js_GetErrorMessage,
+                                     NULL, JSMSG_NEED_DEBUG_MODE);
+        return false;
+    }
+
     /* Debug-mode currently disables Ion compilation. */
     ScriptFrameIter fi(cx);
     for (uint32_t i = 0; i < upCount; ++i, ++fi) {