diff --git a/src/ecmascript/spidermonkey/document.c b/src/ecmascript/spidermonkey/document.c
index fe73963a..f9b2c77b 100644
--- a/src/ecmascript/spidermonkey/document.c
+++ b/src/ecmascript/spidermonkey/document.c
@@ -144,6 +144,9 @@ document_get_property_baseURI(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -152,17 +155,27 @@ document_get_property_baseURI(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &document_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &document_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	char *str = get_uri_string(vs->uri, URI_BASE);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -240,6 +253,9 @@ document_get_property_cookie(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -251,6 +267,9 @@ document_get_property_cookie(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	cookies = send_cookies_js(vs->uri);
@@ -280,6 +299,9 @@ document_set_property_cookie(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -290,6 +312,9 @@ document_set_property_cookie(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	char *text = jsval_to_string(ctx, args[0]);
@@ -434,6 +459,9 @@ document_get_property_documentURI(JSContext *ctx, unsigned int argc, JS::Value *
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -442,8 +470,12 @@ document_get_property_documentURI(JSContext *ctx, unsigned int argc, JS::Value *
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &document_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &document_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
@@ -453,6 +485,9 @@ document_get_property_documentURI(JSContext *ctx, unsigned int argc, JS::Value *
 	char *str = get_uri_string(vs->uri, URI_BASE);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -475,6 +510,9 @@ document_get_property_domain(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -483,17 +521,27 @@ document_get_property_domain(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &document_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &document_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	char *str = get_uri_string(vs->uri, URI_HOST);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -699,6 +747,9 @@ document_get_property_location(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
@@ -719,6 +770,9 @@ document_get_property_nodeType(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	args.rval().setInt32(9);
@@ -739,6 +793,9 @@ document_set_property_location(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -750,6 +807,9 @@ document_set_property_location(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -776,6 +836,9 @@ document_get_property_referrer(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -789,6 +852,9 @@ document_get_property_referrer(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -893,6 +959,9 @@ document_get_property_title(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -904,6 +973,9 @@ document_get_property_title(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -925,6 +997,9 @@ document_set_property_title(JSContext *ctx, int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -939,6 +1014,9 @@ document_set_property_title(JSContext *ctx, int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs || !vs->doc_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -960,6 +1038,9 @@ document_get_property_url(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -972,6 +1053,9 @@ document_get_property_url(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -1000,6 +1084,9 @@ document_set_property_url(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1010,6 +1097,9 @@ document_set_property_url(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -1094,6 +1184,9 @@ document_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, J
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1101,8 +1194,12 @@ document_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, J
 
 	JSClass* classPtr = JS_GetClass(hobj);
 
-	if (classPtr != &document_class)
+	if (classPtr != &document_class) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
@@ -1145,6 +1242,9 @@ document_write_do(JSContext *ctx, unsigned int argc, JS::Value *rval, int newlin
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1751,6 +1851,9 @@ doctype_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1759,8 +1862,12 @@ doctype_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &doctype_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &doctype_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Dtd *dtd = JS_GetPrivate(hobj);
 
@@ -1786,6 +1893,9 @@ doctype_get_property_publicId(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1794,8 +1904,12 @@ doctype_get_property_publicId(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &doctype_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &doctype_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Dtd *dtd = JS_GetPrivate(hobj);
 
@@ -1821,6 +1935,9 @@ doctype_get_property_systemId(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1829,8 +1946,12 @@ doctype_get_property_systemId(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &doctype_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &doctype_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Dtd *dtd = JS_GetPrivate(hobj);
 
diff --git a/src/ecmascript/spidermonkey/element.c b/src/ecmascript/spidermonkey/element.c
index e43cd8a1..a3f8f9ed 100644
--- a/src/ecmascript/spidermonkey/element.c
+++ b/src/ecmascript/spidermonkey/element.c
@@ -158,6 +158,9 @@ element_get_property_attributes(JSContext *ctx, unsigned int argc, JS::Value *vp
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -166,11 +169,18 @@ element_get_property_attributes(JSContext *ctx, unsigned int argc, JS::Value *vp
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -208,6 +218,9 @@ element_get_property_children(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -216,11 +229,18 @@ element_get_property_children(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -274,6 +294,9 @@ element_get_property_childElementCount(JSContext *ctx, unsigned int argc, JS::Va
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -282,11 +305,18 @@ element_get_property_childElementCount(JSContext *ctx, unsigned int argc, JS::Va
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -315,6 +345,9 @@ element_get_property_childNodes(JSContext *ctx, unsigned int argc, JS::Value *vp
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -323,11 +356,18 @@ element_get_property_childNodes(JSContext *ctx, unsigned int argc, JS::Value *vp
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -366,6 +406,9 @@ element_get_property_className(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -374,11 +417,18 @@ element_get_property_className(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -409,6 +459,9 @@ element_get_property_dir(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -417,11 +470,18 @@ element_get_property_dir(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -455,6 +515,9 @@ element_get_property_firstChild(JSContext *ctx, unsigned int argc, JS::Value *vp
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -463,11 +526,18 @@ element_get_property_firstChild(JSContext *ctx, unsigned int argc, JS::Value *vp
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -504,6 +574,9 @@ element_get_property_firstElementChild(JSContext *ctx, unsigned int argc, JS::Va
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -512,11 +585,18 @@ element_get_property_firstElementChild(JSContext *ctx, unsigned int argc, JS::Va
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -562,6 +642,9 @@ element_get_property_id(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -570,11 +653,18 @@ element_get_property_id(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -604,6 +694,9 @@ element_get_property_lang(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -612,11 +705,18 @@ element_get_property_lang(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -646,6 +746,9 @@ element_get_property_lastChild(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -654,11 +757,18 @@ element_get_property_lastChild(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -694,6 +804,9 @@ element_get_property_lastElementChild(JSContext *ctx, unsigned int argc, JS::Val
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -702,11 +815,18 @@ element_get_property_lastElementChild(JSContext *ctx, unsigned int argc, JS::Val
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -752,6 +872,9 @@ element_get_property_nextElementSibling(JSContext *ctx, unsigned int argc, JS::V
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -760,11 +883,18 @@ element_get_property_nextElementSibling(JSContext *ctx, unsigned int argc, JS::V
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -810,6 +940,9 @@ element_get_property_nodeName(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -818,11 +951,18 @@ element_get_property_nodeName(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -868,6 +1008,9 @@ element_get_property_nodeType(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -876,11 +1019,18 @@ element_get_property_nodeType(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -920,6 +1070,9 @@ element_get_property_nodeValue(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -928,11 +1081,18 @@ element_get_property_nodeValue(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -989,6 +1149,9 @@ element_get_property_nextSibling(JSContext *ctx, unsigned int argc, JS::Value *v
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -997,11 +1160,18 @@ element_get_property_nextSibling(JSContext *ctx, unsigned int argc, JS::Value *v
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1038,6 +1208,9 @@ element_get_property_ownerDocument(JSContext *ctx, unsigned int argc, JS::Value
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1046,11 +1219,18 @@ element_get_property_ownerDocument(JSContext *ctx, unsigned int argc, JS::Value
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	args.rval().setObject(*(JSObject *)(interpreter->document_obj));
@@ -1071,6 +1251,9 @@ element_get_property_parentElement(JSContext *ctx, unsigned int argc, JS::Value
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1079,11 +1262,18 @@ element_get_property_parentElement(JSContext *ctx, unsigned int argc, JS::Value
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1120,6 +1310,9 @@ element_get_property_parentNode(JSContext *ctx, unsigned int argc, JS::Value *vp
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1128,11 +1321,18 @@ element_get_property_parentNode(JSContext *ctx, unsigned int argc, JS::Value *vp
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1169,6 +1369,9 @@ element_get_property_previousElementSibling(JSContext *ctx, unsigned int argc, J
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1177,11 +1380,18 @@ element_get_property_previousElementSibling(JSContext *ctx, unsigned int argc, J
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1227,6 +1437,9 @@ element_get_property_previousSibling(JSContext *ctx, unsigned int argc, JS::Valu
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1235,11 +1448,18 @@ element_get_property_previousSibling(JSContext *ctx, unsigned int argc, JS::Valu
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1276,6 +1496,9 @@ element_get_property_tagName(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1284,11 +1507,18 @@ element_get_property_tagName(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1319,6 +1549,9 @@ element_get_property_title(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1327,11 +1560,18 @@ element_get_property_title(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1446,6 +1686,9 @@ element_get_property_innerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1454,11 +1697,18 @@ element_get_property_innerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1491,6 +1741,9 @@ element_get_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1499,11 +1752,18 @@ element_get_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1536,6 +1796,9 @@ element_get_property_textContent(JSContext *ctx, unsigned int argc, JS::Value *v
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1544,11 +1807,18 @@ element_get_property_textContent(JSContext *ctx, unsigned int argc, JS::Value *v
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	xmlpp::Element *el = JS_GetPrivate(hobj);
@@ -1581,6 +1851,9 @@ element_set_property_className(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1589,8 +1862,12 @@ element_set_property_className(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1623,6 +1900,9 @@ element_set_property_dir(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1631,8 +1911,12 @@ element_set_property_dir(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1669,6 +1953,9 @@ element_set_property_id(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1677,8 +1964,12 @@ element_set_property_id(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1712,6 +2003,9 @@ element_set_property_innerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1720,8 +2014,12 @@ element_set_property_innerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1776,6 +2074,9 @@ element_set_property_innerText(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1784,8 +2085,12 @@ element_set_property_innerText(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1824,6 +2129,9 @@ element_set_property_lang(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1832,8 +2140,12 @@ element_set_property_lang(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1867,6 +2179,9 @@ element_set_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1875,8 +2190,12 @@ element_set_property_outerHtml(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1898,6 +2217,9 @@ element_set_property_textContent(JSContext *ctx, unsigned int argc, JS::Value *v
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1906,8 +2228,12 @@ element_set_property_textContent(JSContext *ctx, unsigned int argc, JS::Value *v
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -1930,6 +2256,9 @@ element_set_property_title(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1938,8 +2267,12 @@ element_set_property_title(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	struct view_state *vs = interpreter->vs;
 	if (!vs) {
@@ -2032,6 +2365,9 @@ element_appendChild(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2041,6 +2377,9 @@ element_appendChild(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
 	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2069,6 +2408,9 @@ element_contains(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2077,8 +2419,12 @@ element_contains(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2114,6 +2460,9 @@ element_getAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2122,8 +2471,12 @@ element_getAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2160,6 +2513,9 @@ element_getAttributeNode(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2168,8 +2524,12 @@ element_getAttributeNode(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2197,6 +2557,9 @@ element_hasAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2205,8 +2568,12 @@ element_hasAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2233,6 +2600,9 @@ element_hasAttributes(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 0) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2264,6 +2634,9 @@ element_hasChildNodes(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 0) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2295,6 +2668,9 @@ element_insertBefore(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 2) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2342,6 +2718,9 @@ element_isEqualNode(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2350,8 +2729,12 @@ element_isEqualNode(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2390,6 +2773,9 @@ element_isSameNode(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2398,8 +2784,12 @@ element_isSameNode(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2425,6 +2815,9 @@ element_remove(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 0) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2433,8 +2826,12 @@ element_remove(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2457,6 +2854,9 @@ element_setAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp || argc != 2) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2465,8 +2865,12 @@ element_setAttribute(JSContext *ctx, unsigned int argc, JS::Value *rval)
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &element_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element *el = JS_GetPrivate(hobj);
 
@@ -2559,6 +2963,9 @@ htmlCollection_get_property_length(JSContext *ctx, unsigned int argc, JS::Value
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2567,11 +2974,18 @@ htmlCollection_get_property_length(JSContext *ctx, unsigned int argc, JS::Value
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2635,12 +3049,20 @@ htmlCollection_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::Mutab
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	hvp.setUndefined();
 
@@ -2675,13 +3097,20 @@ htmlCollection_namedItem2(JSContext *ctx, JS::HandleObject hobj, char *str, JS::
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Node::NodeSet *ns = JS_GetPrivate(hobj);
 
@@ -2725,6 +3154,9 @@ htmlCollection_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2734,6 +3166,9 @@ htmlCollection_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
 	if (!JS_InstanceOf(ctx, hobj, &htmlCollection_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2836,6 +3271,9 @@ nodeList_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2844,11 +3282,18 @@ nodeList_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &nodeList_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &nodeList_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2890,12 +3335,20 @@ nodeList_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::MutableHand
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &nodeList_class, NULL)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &nodeList_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	hvp.setUndefined();
 
@@ -2939,6 +3392,9 @@ nodeList_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, J
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2948,6 +3404,9 @@ nodeList_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, J
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
 	if (!JS_InstanceOf(ctx, hobj, &nodeList_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3035,6 +3494,9 @@ attributes_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3043,11 +3505,18 @@ attributes_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3110,12 +3579,20 @@ attributes_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::MutableHa
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	hvp.setUndefined();
 
@@ -3151,13 +3628,20 @@ attributes_namedItem2(JSContext *ctx, JS::HandleObject hobj, char *str, JS::Muta
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	xmlpp::Element::AttributeList *al = JS_GetPrivate(hobj);
 
@@ -3202,6 +3686,9 @@ attributes_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid,
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3211,6 +3698,9 @@ attributes_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid,
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
 	if (!JS_InstanceOf(ctx, hobj, &attributes_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3295,6 +3785,9 @@ attr_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3303,11 +3796,18 @@ attr_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &attr_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &attr_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3337,6 +3837,9 @@ attr_get_property_value(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3345,11 +3848,18 @@ attr_get_property_value(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &attr_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &attr_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
diff --git a/src/ecmascript/spidermonkey/form.c b/src/ecmascript/spidermonkey/form.c
index e290adbb..a53f91a6 100644
--- a/src/ecmascript/spidermonkey/form.c
+++ b/src/ecmascript/spidermonkey/form.c
@@ -167,6 +167,9 @@ input_get_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -175,12 +178,20 @@ input_get_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -202,8 +213,12 @@ input_get_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 		if (keystr) {
 			args.rval().setString(keystr);
 		}
-		else
+		else {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 			return false;
+		}
 	}
 	return true;
 }
@@ -228,6 +243,9 @@ input_set_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -235,12 +253,20 @@ input_set_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -258,6 +284,9 @@ input_set_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	accesskey = UCS_NO_CHAR;
 
 	if (!args[0].isString()) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	JSString *str = args[0].toString();
@@ -281,6 +310,9 @@ input_set_property_accessKey(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	}
 	if (accesskey == UCS_NO_CHAR) {
 		JS_ReportErrorUTF8(ctx, "Invalid UTF-16 sequence");
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -308,6 +340,9 @@ input_get_property_alt(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -316,12 +351,20 @@ input_get_property_alt(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -348,6 +391,9 @@ input_set_property_alt(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -355,12 +401,20 @@ input_set_property_alt(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -383,7 +437,12 @@ input_get_property_checked(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	struct form_state *fs;
 
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 
 	args.rval().setBoolean(fs->state);
 
@@ -407,6 +466,9 @@ input_set_property_checked(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -415,12 +477,20 @@ input_set_property_checked(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -450,6 +520,9 @@ input_get_property_defaultChecked(JSContext *ctx, unsigned int argc, JS::Value *
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -457,12 +530,20 @@ input_get_property_defaultChecked(JSContext *ctx, unsigned int argc, JS::Value *
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -490,6 +571,9 @@ input_get_property_defaultValue(JSContext *ctx, unsigned int argc, JS::Value *vp
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -497,12 +581,17 @@ input_get_property_defaultValue(JSContext *ctx, unsigned int argc, JS::Value *vp
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -531,6 +620,9 @@ input_get_property_disabled(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -538,12 +630,20 @@ input_get_property_disabled(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -572,6 +672,9 @@ input_set_property_disabled(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -579,12 +682,20 @@ input_set_property_disabled(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -609,7 +720,12 @@ input_get_property_form(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	JS::RootedObject parent_form(ctx, JS::GetNonCCWObjectGlobal(hobj));
 	assert(JS_InstanceOf(ctx, parent_form, &form_class, NULL));
-	if_assert_failed return false;
+	if_assert_failed {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	args.rval().setObject(*parent_form);
 
@@ -633,6 +749,9 @@ input_get_property_maxLength(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -640,12 +759,20 @@ input_get_property_maxLength(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -673,6 +800,9 @@ input_set_property_maxLength(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -680,12 +810,20 @@ input_set_property_maxLength(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -713,6 +851,9 @@ input_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -720,12 +861,20 @@ input_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -754,6 +903,9 @@ input_set_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -763,18 +915,27 @@ input_set_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -802,6 +963,9 @@ input_get_property_readonly(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -810,17 +974,29 @@ input_get_property_readonly(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -850,6 +1026,9 @@ input_set_property_readonly(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -858,17 +1037,29 @@ input_set_property_readonly(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -899,6 +1090,9 @@ input_get_property_selectedIndex(JSContext *ctx, unsigned int argc, JS::Value *v
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -907,17 +1101,29 @@ input_get_property_selectedIndex(JSContext *ctx, unsigned int argc, JS::Value *v
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -951,6 +1157,9 @@ input_set_property_selectedIndex(JSContext *ctx, unsigned int argc, JS::Value *v
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -959,17 +1168,29 @@ input_set_property_selectedIndex(JSContext *ctx, unsigned int argc, JS::Value *v
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1004,6 +1225,9 @@ input_get_property_size(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1012,17 +1236,29 @@ input_get_property_size(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1052,6 +1288,9 @@ input_get_property_src(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1060,17 +1299,29 @@ input_get_property_src(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1107,6 +1358,9 @@ input_set_property_src(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1115,8 +1369,12 @@ input_set_property_src(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
@@ -1125,7 +1383,12 @@ input_set_property_src(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1161,6 +1424,9 @@ input_get_property_tabIndex(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1169,17 +1435,29 @@ input_get_property_tabIndex(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1217,6 +1495,9 @@ input_get_property_type(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1225,17 +1506,29 @@ input_get_property_type(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1273,11 +1566,20 @@ input_get_property_value(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 
 	args.rval().setString(JS_NewStringCopyZ(ctx, fs->value));
 
@@ -1301,6 +1603,9 @@ input_set_property_value(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1309,17 +1614,29 @@ input_set_property_value(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	fc = find_form_control(document, fs);
 
 	assert(fc);
@@ -1411,8 +1728,12 @@ input_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS::
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	hvp.setUndefined();
 
@@ -1443,8 +1764,12 @@ input_set_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS::
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &input_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	return true;
 }
@@ -1483,19 +1808,32 @@ input_click(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &input_class, &args)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &input_class, &args)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	ses = doc_view->session;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 
 	assert(fs);
 	fc = find_form_control(document, fs);
@@ -1541,19 +1879,32 @@ input_focus(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &input_class, &args)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &input_class, &args)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
 	document = doc_view->document;
 	ses = doc_view->session;
 	fs = input_get_form_state(ctx, hobj);
-	if (!fs) return false; /* detached */
+	if (!fs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 
 	assert(fs);
 	fc = find_form_control(document, fs);
@@ -1787,6 +2138,9 @@ form_elements_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId h
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1796,6 +2150,9 @@ form_elements_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId h
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
 	if (!JS_InstanceOf(ctx, hobj, &form_elements_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	vs = interpreter->vs;
@@ -1804,7 +2161,12 @@ form_elements_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId h
 
 	form_view = JS_GetInstancePrivate(ctx, hobj, &form_elements_class, nullptr);
 //	form_view = form_get_form_view(ctx, nullptr, /*parent_form*/ NULL);
-	if (!form_view) return false; /* detached */
+	if (!form_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(document, form_view);
 
 	if (JSID_IS_STRING(id)) {
@@ -1865,6 +2227,9 @@ form_elements_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1873,6 +2238,9 @@ form_elements_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -1880,7 +2248,12 @@ form_elements_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *
 	document = doc_view->document;
 	form_view = JS_GetInstancePrivate(ctx, hobj, &form_elements_class, nullptr);
 //	form_view = form_get_form_view(ctx, nullptr, /*parent_form*/ NULL);
-	if (!form_view) return false; /* detached */
+	if (!form_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 
 	form = find_form_by_form_view(document, form_view);
 	args.rval().setInt32(list_size(&form->items));
@@ -1927,12 +2300,20 @@ form_elements_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::Mutabl
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &form_elements_class, NULL)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &form_elements_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
@@ -1942,7 +2323,12 @@ form_elements_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::Mutabl
 
 //	form_view = form_get_form_view(ctx, nullptr/*parent_form*/, NULL);
 
-	if (!form_view) return false; /* detached */
+	if (!form_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(document, form_view);
 
 	hvp.setUndefined();
@@ -2003,6 +2389,9 @@ form_elements_namedItem2(JSContext *ctx, JS::HandleObject hobj, char *string, JS
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2012,7 +2401,12 @@ form_elements_namedItem2(JSContext *ctx, JS::HandleObject hobj, char *string, JS
 		return true;
 	}
 
-	if (!JS_InstanceOf(ctx, hobj, &form_elements_class, NULL)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &form_elements_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
@@ -2020,7 +2414,12 @@ form_elements_namedItem2(JSContext *ctx, JS::HandleObject hobj, char *string, JS
 
 	form_view = JS_GetInstancePrivate(ctx, hobj, &form_elements_class, nullptr);
 //	form_view = form_get_form_view(ctx, nullptr, /*parent_form*/ NULL);
-	if (!form_view) return false; /* detached */
+	if (!form_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(document, form_view);
 
 	hvp.setUndefined();
@@ -2116,6 +2515,9 @@ form_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS::M
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2124,13 +2526,22 @@ form_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS::M
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2185,6 +2596,9 @@ form_get_property_action(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2193,16 +2607,28 @@ form_get_property_action(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2228,6 +2654,9 @@ form_set_property_action(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2236,16 +2665,28 @@ form_set_property_action(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2274,11 +2715,20 @@ form_get_property_elements(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 
 	/* jsform ('form') is form_elements' parent; who knows is that's correct */
 	JSObject *jsform_elems = JS_NewObjectWithGivenProto(ctx, &form_elements_class, hobj);
@@ -2310,6 +2760,9 @@ form_get_property_encoding(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2318,16 +2771,28 @@ form_get_property_encoding(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2366,6 +2831,9 @@ form_set_property_encoding(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2374,16 +2842,28 @@ form_set_property_encoding(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2421,6 +2901,9 @@ form_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2429,16 +2912,28 @@ form_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2464,6 +2959,9 @@ form_get_property_method(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2472,16 +2970,28 @@ form_get_property_method(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2519,6 +3029,9 @@ form_set_property_method(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2527,16 +3040,28 @@ form_set_property_method(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2571,6 +3096,9 @@ form_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2579,16 +3107,28 @@ form_get_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2615,6 +3155,9 @@ form_set_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2623,16 +3166,28 @@ form_set_property_name(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2657,6 +3212,9 @@ form_get_property_target(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2665,16 +3223,28 @@ form_get_property_target(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2699,6 +3269,9 @@ form_set_property_target(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2707,16 +3280,28 @@ form_set_property_target(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &form_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
 	fv = form_get_form_view(ctx, hobj, NULL);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2746,18 +3331,31 @@ form_reset(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &form_class, &args)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &form_class, &args)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
 ///	fv = form_get_form_view(ctx, obj, argv);
 	fv = form_get_form_view(ctx, hobj, rval);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2791,19 +3389,32 @@ form_submit(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &form_class, &args)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &form_class, &args)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
 	ses = doc_view->session;
 //	fv = form_get_form_view(ctx, obj, argv);
 	fv = form_get_form_view(ctx, hobj, rval);
-	if (!fv) return false; /* detached */
+	if (!fv) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false; /* detached */
+	}
 	form = find_form_by_form_view(doc_view->document, fv);
 
 	assert(form);
@@ -2987,6 +3598,9 @@ forms_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS::
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -2995,8 +3609,12 @@ forms_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS::
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &forms_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &forms_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
@@ -3036,6 +3654,9 @@ forms_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3044,11 +3665,18 @@ forms_get_property_length(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &forms_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &forms_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -3091,11 +3719,18 @@ forms_item2(JSContext *ctx, JS::HandleObject hobj, int index, JS::MutableHandleV
 	struct form_view *fv;
 	int counter = -1;
 
-	if (!JS_InstanceOf(ctx, hobj, &forms_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &forms_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -3134,12 +3769,20 @@ forms_namedItem(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &forms_class, &args)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &forms_class, &args)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
diff --git a/src/ecmascript/spidermonkey/localstorage.c b/src/ecmascript/spidermonkey/localstorage.c
index ed0969b7..cc4808d8 100644
--- a/src/ecmascript/spidermonkey/localstorage.c
+++ b/src/ecmascript/spidermonkey/localstorage.c
@@ -151,6 +151,9 @@ localstorage_getitem(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	if (!comp)
 	{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -195,6 +198,9 @@ localstorage_setitem(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	if (!comp)
 	{
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
diff --git a/src/ecmascript/spidermonkey/location.c b/src/ecmascript/spidermonkey/location.c
index 8ba19f17..e3ba2cf8 100644
--- a/src/ecmascript/spidermonkey/location.c
+++ b/src/ecmascript/spidermonkey/location.c
@@ -87,6 +87,9 @@ history_back(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -115,6 +118,9 @@ history_forward(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -140,6 +146,9 @@ history_go(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -243,6 +252,9 @@ location_get_property_hash(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -251,11 +263,18 @@ location_get_property_hash(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -285,6 +304,9 @@ location_get_property_host(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -293,17 +315,27 @@ location_get_property_host(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	char *str = get_uri_string(vs->uri, URI_HOST | URI_PORT);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -326,6 +358,9 @@ location_get_property_hostname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -334,17 +369,27 @@ location_get_property_hostname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	char *str = get_uri_string(vs->uri, URI_HOST);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -367,6 +412,9 @@ location_get_property_href(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -375,17 +423,27 @@ location_get_property_href(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	char *str = get_uri_string(vs->uri, URI_ORIGINAL);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -408,6 +466,9 @@ location_get_property_origin(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -416,17 +477,27 @@ location_get_property_origin(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	char *str = get_uri_string(vs->uri, URI_SERVER);
 
 	if (!str) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -449,6 +520,9 @@ location_get_property_pathname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -457,11 +531,18 @@ location_get_property_pathname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -491,6 +572,9 @@ location_get_property_port(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -499,11 +583,15 @@ location_get_property_port(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -531,6 +619,9 @@ location_get_property_protocol(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -539,11 +630,18 @@ location_get_property_protocol(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -577,6 +675,9 @@ location_get_property_search(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -585,11 +686,18 @@ location_get_property_search(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -621,6 +729,9 @@ location_set_property_hash(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -629,11 +740,18 @@ location_set_property_hash(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -655,6 +773,9 @@ location_set_property_host(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -663,11 +784,18 @@ location_set_property_host(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -688,6 +816,9 @@ location_set_property_hostname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -696,11 +827,18 @@ location_set_property_hostname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -721,6 +859,9 @@ location_set_property_href(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -729,11 +870,15 @@ location_set_property_href(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -754,6 +899,9 @@ location_set_property_pathname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -762,11 +910,18 @@ location_set_property_pathname(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -787,6 +942,9 @@ location_set_property_port(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -795,11 +953,18 @@ location_set_property_port(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -820,6 +985,9 @@ location_set_property_protocol(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -828,11 +996,18 @@ location_set_property_protocol(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -853,6 +1028,9 @@ location_set_property_search(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -861,11 +1039,18 @@ location_set_property_search(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	location_goto_common(ctx, vs->doc_view, args[0]);
@@ -897,6 +1082,9 @@ location_reload(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -905,11 +1093,18 @@ location_reload(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &location_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
diff --git a/src/ecmascript/spidermonkey/screen.c b/src/ecmascript/spidermonkey/screen.c
index e8f63ebe..28c8f77e 100644
--- a/src/ecmascript/spidermonkey/screen.c
+++ b/src/ecmascript/spidermonkey/screen.c
@@ -91,6 +91,9 @@ screen_get_property_availHeight(JSContext *ctx, unsigned int argc, JS::Value *vp
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -99,17 +102,27 @@ screen_get_property_availHeight(JSContext *ctx, unsigned int argc, JS::Value *vp
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct document_view *doc_view = vs->doc_view;
 
 	if (!doc_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -131,6 +144,9 @@ screen_get_property_availWidth(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -139,17 +155,27 @@ screen_get_property_availWidth(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct document_view *doc_view = vs->doc_view;
 
 	if (!doc_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -171,6 +197,9 @@ screen_get_property_height(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -179,23 +208,36 @@ screen_get_property_height(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct document_view *doc_view = vs->doc_view;
 
 	if (!doc_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct session *ses = doc_view->session;
 
 	if (!ses) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -217,6 +259,9 @@ screen_get_property_width(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -225,23 +270,36 @@ screen_get_property_width(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct document_view *doc_view = vs->doc_view;
 
 	if (!doc_view) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct session *ses = doc_view->session;
 
 	if (!ses) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
diff --git a/src/ecmascript/spidermonkey/unibar.c b/src/ecmascript/spidermonkey/unibar.c
index e30e63c9..9b6866a7 100644
--- a/src/ecmascript/spidermonkey/unibar.c
+++ b/src/ecmascript/spidermonkey/unibar.c
@@ -119,6 +119,9 @@ unibar_get_property_visible(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -128,11 +131,18 @@ unibar_get_property_visible(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
 	if (!JS_InstanceOf(ctx, hobj, &menubar_class, NULL)
-	 && !JS_InstanceOf(ctx, hobj, &statusbar_class, NULL))
+	 && !JS_InstanceOf(ctx, hobj, &statusbar_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
@@ -175,6 +185,9 @@ unibar_set_property_visible(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -184,11 +197,18 @@ unibar_set_property_visible(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
 	if (!JS_InstanceOf(ctx, hobj, &menubar_class, NULL)
-	 && !JS_InstanceOf(ctx, hobj, &statusbar_class, NULL))
+	 && !JS_InstanceOf(ctx, hobj, &statusbar_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;
diff --git a/src/ecmascript/spidermonkey/window.c b/src/ecmascript/spidermonkey/window.c
index 45ad639c..333336b3 100644
--- a/src/ecmascript/spidermonkey/window.c
+++ b/src/ecmascript/spidermonkey/window.c
@@ -155,6 +155,9 @@ window_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS:
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -162,8 +165,12 @@ window_get_property(JSContext *ctx, JS::HandleObject hobj, JS::HandleId hid, JS:
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &window_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &window_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	vs = interpreter->vs;
 
@@ -224,6 +231,9 @@ window_alert(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -275,12 +285,20 @@ window_open(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
 	struct ecmascript_interpreter *interpreter = JS::GetRealmPrivate(comp);
 
-	if (!JS_InstanceOf(ctx, hobj, &window_class, &args)) return false;
+	if (!JS_InstanceOf(ctx, hobj, &window_class, &args)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
+		return false;
+	}
 
 	vs = interpreter->vs;
 	doc_view = vs->doc_view;
@@ -387,6 +405,9 @@ window_setTimeout(JSContext *ctx, unsigned int argc, JS::Value *rval)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -433,8 +454,12 @@ window_get_property_closed(JSContext *ctx, JS::HandleObject hobj, JS::HandleId h
 	/* This can be called if @obj if not itself an instance of the
 	 * appropriate class but has one in its prototype chain.  Fail
 	 * such calls.  */
-	if (!JS_InstanceOf(ctx, hobj, &window_class, NULL))
+	if (!JS_InstanceOf(ctx, hobj, &window_class, NULL)) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
+	}
 
 	boolean_to_jsval(ctx, vp, 0);
 
@@ -488,6 +513,9 @@ window_get_property_self(JSContext *ctx, unsigned int argc, JS::Value *vp)
 
 	args.rval().setObject(*hobj);
 
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 	return false;
 }
 
@@ -511,6 +539,9 @@ window_set_property_status(JSContext *ctx, unsigned int argc, JS::Value *vp)
 #endif
 	JS::CallArgs args = CallArgsFromVp(argc, vp);
 	if (args.length() != 1) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -518,6 +549,9 @@ window_set_property_status(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -549,6 +583,9 @@ window_get_property_top(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	JS::Realm *comp = js::GetContextRealm(ctx);
 
 	if (!comp) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 
@@ -559,6 +596,9 @@ window_get_property_top(JSContext *ctx, unsigned int argc, JS::Value *vp)
 	vs = interpreter->vs;
 
 	if (!vs) {
+#ifdef ECMASCRIPT_DEBUG
+	fprintf(stderr, "%s:%s %d\n", __FILE__, __FUNCTION__, __LINE__);
+#endif
 		return false;
 	}
 	doc_view = vs->doc_view;