Bug 626830 - Allow JSD to turn on debugging when no JS code is running, not just when XPConnect stack is completely empty, r=dmandelin

--HG--
extra : rebase_source : 3f177904d2708642dfec8d5937964ec8fc83427a

js/src/xpconnect/src/nsXPConnect.cpp

@@ -2498,14 +2498,19 @@ nsXPConnect::Push(JSContext * cx)
     if(!data)
         return NS_ERROR_FAILURE;
 
-    PRInt32 count;
-    nsresult rv;
-    rv = data->GetJSContextStack()->GetCount(&count);
-    if (NS_FAILED(rv))
-        return rv;
-
-    if (count == 0)
-        CheckForDebugMode(mRuntime->GetJSRuntime());
+    if (gDebugMode != gDesiredDebugMode && NS_IsMainThread()) {
+        const nsTArray<XPCJSContextInfo>* stack = data->GetJSContextStack()->GetStack();
+        bool runningJS = false;
+        for (PRUint32 i = 0; i < stack->Length(); ++i) {
+            JSContext *cx = (*stack)[i].cx;
+            if (cx && cx->regs) {
+                runningJS = true;
+                break;
+            }
+        }
+        if (!runningJS)
+            CheckForDebugMode(mRuntime->GetJSRuntime());
+    }
 
     return data->GetJSContextStack()->Push(cx);
 }