зеркало из https://github.com/mozilla/gecko-dev.git
Attachment 255316: Optimize GetProperty to get rid of intermediate objects. r=brendan
This commit is contained in:
igor.bukanov%gmail.com
Родитель
248c6fb367
Коммит
e039e2a2ff
194
js/src/jsxml.c
194
js/src/jsxml.c
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@ -4056,34 +4056,72 @@ SyncInScopeNamespaces(JSContext *cx, JSXML *xml)
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return JS_TRUE;
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}
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static JSBool
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GetNamedProperty(JSContext *cx, JSXML *xml, JSXMLQName* nameqn,
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JSBool attributes, JSXML *list)
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{
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JSXMLArray *array;
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JSXMLNameMatcher matcher;
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JSXMLArrayCursor cursor;
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JSXML *kid;
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JSBool ok;
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if (!JSXML_HAS_KIDS(xml))
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return JS_TRUE;
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if (attributes) {
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array = &xml->xml_attrs;
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matcher = MatchAttrName;
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} else {
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array = &xml->xml_kids;
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matcher = MatchElemName;
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}
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XMLArrayCursorInit(&cursor, array);
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while ((kid = (JSXML *) XMLArrayCursorNext(&cursor)) != NULL) {
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if (matcher(nameqn, kid)) {
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if (!attributes && kid->xml_class == JSXML_CLASS_ELEMENT) {
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ok = SyncInScopeNamespaces(cx, kid);
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if (!ok)
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goto out;
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}
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ok = Append(cx, list, kid);
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if (!ok)
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goto out;
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}
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}
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ok = JS_TRUE;
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out:
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XMLArrayCursorFinish(&cursor);
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return ok;
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}
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/* ECMA-357 9.1.1.1 XML [[Get]] and 9.2.1.1 XMLList [[Get]]. */
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static JSBool
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GetProperty(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
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{
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JSXML *xml, *list, *kid;
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uint32 index;
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JSObject *kidobj, *listobj, *nameobj;
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JSObject *kidobj, *listobj;
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JSXMLQName *nameqn;
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jsid funid;
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JSBool ok;
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jsval roots[2];
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JSTempValueRooter tvr;
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JSBool attributes;
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JSXMLArrayCursor cursor;
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jsval kidval;
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JSXMLArray *array;
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JSXMLNameMatcher matcher;
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xml = (JSXML *) JS_GetInstancePrivate(cx, obj, &js_XMLClass, NULL);
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if (!xml)
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return JS_TRUE;
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#ifdef __GNUC__
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list = NULL; /* quell GCC overwarning */
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#endif
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retry:
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if (xml->xml_class == JSXML_CLASS_LIST) {
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/* ECMA-357 9.2.1.1 starts here. */
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if (js_IdIsIndex(id, &index)) {
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if (xml->xml_class != JSXML_CLASS_LIST) {
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*vp = (index == 0) ? OBJECT_TO_JSVAL(obj) : JSVAL_VOID;
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} else {
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/*
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* ECMA-357 9.2.1.1 starts here.
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*
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* Erratum: 9.2 is not completely clear that indexed properties
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* correspond to kids, but that's what it seems to say, and it's
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* what any sane user would want.
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@ -4102,133 +4140,61 @@ retry:
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} else {
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*vp = JSVAL_VOID;
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}
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}
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return JS_TRUE;
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}
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/*
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* ECMA-357 9.2.1.1/9.1.1.1 qname case.
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*/
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nameqn = ToXMLName(cx, id, &funid);
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if (!nameqn)
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return JS_FALSE;
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if (funid)
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return GetFunction(cx, obj, xml, funid, vp);
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/*
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* Recursion through GetProperty may allocate more list objects, so
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* we make use of local root scopes here. Each new allocation will
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* push the newborn onto the local root stack.
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*/
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ok = js_EnterLocalRootScope(cx);
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if (!ok)
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return JS_FALSE;
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roots[0] = OBJECT_TO_JSVAL(nameqn->object);
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JS_PUSH_TEMP_ROOT(cx, 1, roots, &tvr);
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/*
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* NB: nameqn is already protected from GC by cx->newborn[GCX_OBJECT]
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* until listobj is created. After that, a local root keeps listobj
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* alive, and listobj's private keeps nameqn alive via targetprop.
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*/
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listobj = js_NewXMLObject(cx, JSXML_CLASS_LIST);
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if (!listobj) {
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ok = JS_FALSE;
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} else {
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list = (JSXML *) JS_GetPrivate(cx, listobj);
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list->xml_target = xml;
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if (listobj) {
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roots[1] = OBJECT_TO_JSVAL(listobj);
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tvr.count++;
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list = (JSXML *) JS_GetPrivate(cx, listobj);
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attributes = (OBJ_GET_CLASS(cx, nameqn->object) ==
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&js_AttributeNameClass);
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if (xml->xml_class == JSXML_CLASS_LIST) {
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XMLArrayCursorInit(&cursor, &xml->xml_kids);
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while ((kid = (JSXML *) XMLArrayCursorNext(&cursor)) != NULL) {
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if (kid->xml_class == JSXML_CLASS_ELEMENT) {
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kidobj = js_GetXMLObject(cx, kid);
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if (!kidobj) {
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ok = JS_FALSE;
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break;
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}
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ok = GetProperty(cx, kidobj, id, &kidval);
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if (!ok)
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break;
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kidobj = JSVAL_TO_OBJECT(kidval);
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kid = (JSXML *) JS_GetPrivate(cx, kidobj);
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if (JSXML_LENGTH(kid) > 0) {
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ok = Append(cx, list, kid);
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if (!ok)
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break;
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}
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}
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}
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XMLArrayCursorFinish(&cursor);
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}
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} else {
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/* ECMA-357 9.1.1.1 starts here. */
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if (js_IdIsIndex(id, &index)) {
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obj = ToXMLList(cx, OBJECT_TO_JSVAL(obj));
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if (!obj)
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return JS_FALSE;
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xml = (JSXML *) JS_GetPrivate(cx, obj);
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goto retry;
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}
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nameqn = ToXMLName(cx, id, &funid);
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if (!nameqn)
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return JS_FALSE;
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if (funid)
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return GetFunction(cx, obj, xml, funid, vp);
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nameobj = nameqn->object;
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/*
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* Recursion through GetProperty may allocate more list objects, so
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* we make use of local root scopes here. Each new allocation will
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* push the newborn onto the local root stack.
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*/
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ok = js_EnterLocalRootScope(cx);
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if (!ok)
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return JS_FALSE;
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listobj = js_NewXMLObject(cx, JSXML_CLASS_LIST);
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if (!listobj) {
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ok = JS_FALSE;
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} else {
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list = (JSXML *) JS_GetPrivate(cx, listobj);
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list->xml_target = xml;
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if (JSXML_HAS_KIDS(xml)) {
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if (OBJ_GET_CLASS(cx, nameobj) == &js_AttributeNameClass) {
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array = &xml->xml_attrs;
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matcher = MatchAttrName;
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} else {
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array = &xml->xml_kids;
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matcher = MatchElemName;
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}
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XMLArrayCursorInit(&cursor, array);
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while ((kid = (JSXML *) XMLArrayCursorNext(&cursor)) != NULL) {
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if (matcher(nameqn, kid)) {
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if (array == &xml->xml_kids &&
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kid->xml_class == JSXML_CLASS_ELEMENT) {
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ok = SyncInScopeNamespaces(cx, kid);
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if (!ok)
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break;
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}
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ok = Append(cx, list, kid);
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if (!ok)
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if (kid->xml_class == JSXML_CLASS_ELEMENT &&
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!GetNamedProperty(cx, kid, nameqn, attributes, list)) {
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listobj = NULL;
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break;
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}
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}
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XMLArrayCursorFinish(&cursor);
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} else {
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if (!GetNamedProperty(cx, xml, nameqn, attributes, list))
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listobj = NULL;
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}
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}
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}
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/* Common tail code for list and non-list cases. */
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js_LeaveLocalRootScopeWithResult(cx, (jsval) listobj);
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if (!ok)
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return JS_FALSE;
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/*
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* Erratum: ECMA-357 9.1.1.1 misses that [[Append]] sets the given list's
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* [[TargetProperty]] to the property that is being appended. This means
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* that any use of the internal [[Get]] property returns a list which,
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* when used by e.g. [[Insert]] duplicates the last element matched by id.
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* Erratum: ECMA-357 9.1.1.1 misses that [[Append]] sets the given
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* list's [[TargetProperty]] to the property that is being appended.
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* This means that any use of the internal [[Get]] property returns
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* a list which, when used by e.g. [[Insert]] duplicates the last
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* element matched by id.
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* See bug 336921.
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*/
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list->xml_target = xml;
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list->xml_targetprop = nameqn;
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*vp = OBJECT_TO_JSVAL(listobj);
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return JS_TRUE;
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}
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JS_POP_TEMP_ROOT(cx, &tvr);
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return listobj != NULL;
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}
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static JSXML *
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