Bug 704369: Factor EmitTree to avoid recursion limit. (r=Waldo)

js/src/jscntxtinlines.h

@@ -118,10 +118,34 @@ class AutoNamespaceArray : protected AutoGCRooter {
     JSXMLArray<JSObject> array;
 };
 
+template <typename T>
+class AutoPtr
+{
+    JSContext *cx;
+    T *value;
+
+    AutoPtr(const AutoPtr &other) MOZ_DELETE;
+
+  public:
+    explicit AutoPtr(JSContext *cx) : cx(cx), value(NULL) {}
+    ~AutoPtr() {
+        cx->delete_<T>(value);
+    }
+
+    void operator=(T *ptr) { value = ptr; }
+
+    typedef void ***** ConvertibleToBool;
+    operator ConvertibleToBool() const { return (ConvertibleToBool) value; }
+
+    const T *operator->() const { return value; }
+    T *operator->() { return value; }
+
+    T *get() { return value; }
+};
+
 #ifdef DEBUG
 class CompartmentChecker
 {
-  private:
     JSContext *context;
     JSCompartment *compartment;