зеркало из https://github.com/mozilla/gecko-dev.git
569 строки
14 KiB
C++
569 строки
14 KiB
C++
/* -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 8 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Firefox.
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Foundation <http://www.mozilla.org>.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Ben Newman <mozilla@benjamn.com> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "base/basictypes.h"
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#include "jscntxt.h"
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#include "jsapi.h"
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#include "jshashtable.h"
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#include "mozilla/jetpack/JetpackActorCommon.h"
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#include "mozilla/jetpack/PJetpack.h"
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#include "mozilla/jetpack/PHandleParent.h"
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#include "mozilla/jetpack/PHandleChild.h"
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#include "mozilla/jetpack/Handle.h"
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#include "nsJSUtils.h"
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using namespace mozilla::jetpack;
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class JetpackActorCommon::OpaqueSeenType
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{
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public:
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typedef JSObject* KeyType;
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typedef size_t IdType;
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typedef js::HashMap<
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KeyType, IdType,
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js::DefaultHasher<KeyType>,
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js::SystemAllocPolicy
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> MapType;
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OpaqueSeenType() {
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(void) map.init(1);
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}
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bool ok() { return map.initialized(); }
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// Reserving 0 as an invalid ID means starting the valid IDs at 1. We
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// could have reserved a dummy first element of rmap, but that would
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// have wasted space.
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static const IdType kInvalidId = 0;
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bool add(KeyType obj, IdType* id) {
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MapType::AddPtr ap = map.lookupForAdd(obj);
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if (!ap) {
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if (!rmap.AppendElement(obj) ||
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!map.add(ap, obj, *id = rmap.Length()))
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*id = kInvalidId;
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return true;
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}
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*id = ap->value;
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return false;
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}
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KeyType reverseLookup(IdType id) {
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return rmap.SafeElementAt(id - 1, NULL);
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}
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private:
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MapType map;
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nsAutoTArray<KeyType, 4> rmap;
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};
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bool
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JetpackActorCommon::jsval_to_PrimVariant(JSContext* cx, JSType type, jsval from,
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PrimVariant* to)
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{
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// A false return from this function just means the value couldn't be
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// converted to a PrimVariant (i.e., it wasn't a primitive value).
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switch (type) {
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case JSTYPE_VOID:
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*to = void_t();
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return true;
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case JSTYPE_NULL:
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*to = null_t();
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return true;
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case JSTYPE_FUNCTION:
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return false;
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case JSTYPE_OBJECT: {
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HandleParent* hp = HandleParent::FromJSVal(cx, from);
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HandleChild* hc = HandleChild::FromJSVal(cx, from);
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NS_ASSERTION(!hc || !hp, "Can't be both a parent and a child");
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if (hp) {
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*to = hp;
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return true;
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}
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if (hc) {
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*to = hc;
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return true;
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}
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return false;
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}
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case JSTYPE_STRING:
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{
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nsDependentJSString depStr;
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if (!depStr.init(cx, from))
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return false;
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*to = depStr;
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}
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return true;
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case JSTYPE_NUMBER:
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if (JSVAL_IS_INT(from))
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*to = JSVAL_TO_INT(from);
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else if (JSVAL_IS_DOUBLE(from))
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*to = JSVAL_TO_DOUBLE(from);
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else
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return false;
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return true;
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case JSTYPE_BOOLEAN:
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*to = !!JSVAL_TO_BOOLEAN(from);
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return true;
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case JSTYPE_XML:
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return false;
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default:
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return false;
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}
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}
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bool
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JetpackActorCommon::jsval_to_CompVariant(JSContext* cx, JSType type, jsval from,
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CompVariant* to, OpaqueSeenType* seen)
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{
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if (type != JSTYPE_OBJECT)
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return false;
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Maybe<OpaqueSeenType> lost;
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if (!seen) {
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lost.construct();
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seen = lost.addr();
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if (!seen->ok())
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return false;
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}
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OpaqueSeenType::KeyType obj = JSVAL_TO_OBJECT(from);
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OpaqueSeenType::IdType id;
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if (!seen->add(obj, &id)) {
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if (OpaqueSeenType::kInvalidId == id)
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return false;
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*to = CompVariant(id);
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return true;
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}
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if (JS_IsArrayObject(cx, obj)) {
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nsTArray<Variant> elems;
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jsuint len;
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if (!JS_GetArrayLength(cx, obj, &len) ||
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!elems.SetCapacity(len))
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return false;
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for (jsuint i = 0; i < len; ++i) {
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jsval val;
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Variant* vp = elems.AppendElement();
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if (!JS_GetElement(cx, obj, i, &val) ||
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!jsval_to_Variant(cx, val, vp, seen))
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*vp = void_t();
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}
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InfallibleTArray<Variant> outElems;
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outElems.SwapElements(elems);
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*to = outElems;
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return true;
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}
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js::AutoIdArray ida(cx, JS_Enumerate(cx, obj));
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if (!ida)
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return false;
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nsTArray<KeyValue> kvs;
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for (size_t i = 0; i < ida.length(); ++i) {
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jsval val; // reused for both key and value
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if (!JS_IdToValue(cx, ida[i], &val))
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return false;
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JSString* idStr = JS_ValueToString(cx, val);
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if (!idStr)
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return false;
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if (!JS_GetPropertyById(cx, obj, ida[i], &val))
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return false;
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KeyValue kv;
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// Silently drop properties that can't be converted.
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if (jsval_to_Variant(cx, val, &kv.value(), seen)) {
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nsDependentJSString depStr;
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if (!depStr.init(cx, idStr))
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return false;
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kv.key() = depStr;
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// If AppendElement fails, we lose this property, no big deal.
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kvs.AppendElement(kv);
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}
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}
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InfallibleTArray<KeyValue> outKvs;
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outKvs.SwapElements(kvs);
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*to = outKvs;
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return true;
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}
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bool
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JetpackActorCommon::jsval_to_Variant(JSContext* cx, jsval from, Variant* to,
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OpaqueSeenType* seen)
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{
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JSType type = JS_TypeOfValue(cx, from);
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if (JSVAL_IS_NULL(from))
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type = JSTYPE_NULL;
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PrimVariant pv;
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if (jsval_to_PrimVariant(cx, type, from, &pv)) {
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*to = pv;
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return true;
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}
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CompVariant cv;
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if (jsval_to_CompVariant(cx, type, from, &cv, seen)) {
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*to = cv;
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return true;
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}
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return false;
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}
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bool
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JetpackActorCommon::jsval_from_PrimVariant(JSContext* cx,
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const PrimVariant& from,
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jsval* to)
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{
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switch (from.type()) {
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case PrimVariant::Tvoid_t:
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*to = JSVAL_VOID;
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return true;
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case PrimVariant::Tnull_t:
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*to = JSVAL_NULL;
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return true;
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case PrimVariant::Tbool:
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*to = from.get_bool() ? JSVAL_TRUE : JSVAL_FALSE;
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return true;
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case PrimVariant::Tint:
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*to = INT_TO_JSVAL(from.get_int());
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return true;
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case PrimVariant::Tdouble:
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return !!JS_NewNumberValue(cx, from.get_double(), to);
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case PrimVariant::TnsString: {
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const nsString& str = from.get_nsString();
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// TODO Use some sort of sharedstring/stringbuffer abstraction to
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// exploit sharing opportunities more generally.
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if (!str.Length()) {
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*to = JS_GetEmptyStringValue(cx);
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return true;
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}
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JSString* s =
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JS_NewUCStringCopyN(cx, str.get(), str.Length());
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if (!s)
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return false;
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*to = STRING_TO_JSVAL(s);
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return true;
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}
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case PrimVariant::TPHandleParent: {
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JSObject* hobj =
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static_cast<HandleParent*>(from.get_PHandleParent())->ToJSObject(cx);
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if (!hobj)
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return false;
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*to = OBJECT_TO_JSVAL(hobj);
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return true;
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}
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case PrimVariant::TPHandleChild: {
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JSObject* hobj =
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static_cast<HandleChild*>(from.get_PHandleChild())->ToJSObject(cx);
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if (!hobj)
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return false;
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*to = OBJECT_TO_JSVAL(hobj);
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return true;
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}
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default:
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return false;
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}
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}
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bool
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JetpackActorCommon::jsval_from_CompVariant(JSContext* cx,
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const CompVariant& from,
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jsval* to,
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OpaqueSeenType* seen)
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{
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Maybe<OpaqueSeenType> lost;
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if (!seen) {
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lost.construct();
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seen = lost.addr();
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if (!seen->ok())
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return false;
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}
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JSObject* obj = NULL;
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switch (from.type()) {
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case CompVariant::TArrayOfKeyValue: {
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if (!(obj = JS_NewObject(cx, NULL, NULL, NULL)))
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return false;
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js::AutoObjectRooter root(cx, obj);
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OpaqueSeenType::IdType ignored;
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if (!seen->add(obj, &ignored))
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return false;
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const nsTArray<KeyValue>& kvs = from.get_ArrayOfKeyValue();
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for (PRUint32 i = 0; i < kvs.Length(); ++i) {
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const KeyValue& kv = kvs.ElementAt(i);
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js::AutoValueRooter toSet(cx);
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if (!jsval_from_Variant(cx, kv.value(), toSet.jsval_addr(), seen) ||
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!JS_SetUCProperty(cx, obj,
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kv.key().get(),
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kv.key().Length(),
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toSet.jsval_addr()))
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return false;
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}
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break;
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}
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case CompVariant::TArrayOfVariant: {
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const nsTArray<Variant>& vs = from.get_ArrayOfVariant();
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nsAutoTArray<jsval, 8> jsvals;
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jsval* elems = jsvals.AppendElements(vs.Length());
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if (!elems)
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return false;
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for (PRUint32 i = 0; i < vs.Length(); ++i)
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elems[i] = JSVAL_VOID;
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js::AutoArrayRooter root(cx, vs.Length(), elems);
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OpaqueSeenType::IdType ignored;
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if (!seen->add(obj, &ignored))
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return false;
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for (PRUint32 i = 0; i < vs.Length(); ++i)
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if (!jsval_from_Variant(cx, vs.ElementAt(i), elems + i, seen))
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return false;
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if (!(obj = JS_NewArrayObject(cx, vs.Length(), elems)))
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return false;
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break;
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}
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case CompVariant::Tsize_t:
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if (!(obj = seen->reverseLookup(from.get_size_t())))
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return false;
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break;
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default:
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return false;
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}
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*to = OBJECT_TO_JSVAL(obj);
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return true;
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}
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bool
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JetpackActorCommon::jsval_from_Variant(JSContext* cx, const Variant& from,
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jsval* to, OpaqueSeenType* seen)
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{
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switch (from.type()) {
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case Variant::TPrimVariant:
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return jsval_from_PrimVariant(cx, from, to);
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case Variant::TCompVariant:
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return jsval_from_CompVariant(cx, from, to, seen);
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default:
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return false;
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}
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}
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bool
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JetpackActorCommon::RecvMessage(JSContext* cx,
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const nsString& messageName,
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const InfallibleTArray<Variant>& data,
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InfallibleTArray<Variant>* results)
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{
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if (results)
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results->Clear();
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JSObject* implGlobal = JS_GetGlobalObject(cx);
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JSAutoEnterCompartment ac;
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if (!ac.enter(cx, implGlobal))
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return false;
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RecList* list;
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if (!mReceivers.Get(messageName, &list))
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return true;
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nsAutoTArray<jsval, 4> snapshot;
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if (!list->copyTo(cx, snapshot))
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return false;
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if (!snapshot.Length())
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return true;
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nsAutoTArray<jsval, 4> args;
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PRUint32 argc = data.Length() + 1;
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jsval* argv = args.AppendElements(argc);
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if (!argv)
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return false;
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for (PRUint32 i = 0; i < argc; ++i)
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argv[i] = JSVAL_VOID;
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js::AutoArrayRooter argvRooter(cx, argc, argv);
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JSString* msgNameStr =
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JS_NewUCStringCopyN(cx,
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messageName.get(),
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messageName.Length());
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if (!msgNameStr)
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return false;
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argv[0] = STRING_TO_JSVAL(msgNameStr);
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for (PRUint32 i = 0; i < data.Length(); ++i)
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if (!jsval_from_Variant(cx, data.ElementAt(i), argv + i + 1))
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return false;
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js::AutoValueRooter rval(cx);
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for (PRUint32 i = 0; i < snapshot.Length(); ++i) {
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Variant* vp = results ? results->AppendElement() : NULL;
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rval.set(JSVAL_VOID);
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if (!JS_CallFunctionValue(cx, implGlobal, snapshot[i], argc, argv,
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rval.jsval_addr())) {
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(void) JS_ReportPendingException(cx);
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if (vp)
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*vp = void_t();
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} else if (vp && !jsval_to_Variant(cx, rval.jsval_value(), vp))
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*vp = void_t();
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}
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return true;
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}
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JetpackActorCommon::RecList::~RecList()
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{
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while (mHead) {
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RecNode* old = mHead;
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mHead = mHead->down;
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delete old;
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}
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}
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void
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JetpackActorCommon::RecList::add(jsval v)
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{
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RecNode* node = mHead, *tail = NULL;
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while (node) {
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if (node->value() == v)
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return;
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node = (tail = node)->down;
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}
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node = new RecNode(mCx, v);
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if (tail)
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tail->down = node;
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else
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mHead = node;
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}
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void
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JetpackActorCommon::RecList::remove(jsval v)
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{
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while (mHead && mHead->value() == v) {
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RecNode* old = mHead;
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mHead = mHead->down;
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delete old;
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}
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if (!mHead)
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return;
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RecNode* prev = mHead, *node = prev->down;
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while (node) {
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if (node->value() == v) {
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prev->down = node->down;
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delete node;
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} else
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prev = node;
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node = prev->down;
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}
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}
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bool
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JetpackActorCommon::RecList::copyTo(JSContext *cx, nsTArray<jsval>& dst) const
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{
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dst.Clear();
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for (RecNode* node = mHead; node; node = node->down) {
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jsval v = node->value();
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if (!JS_WrapValue(cx, &v))
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return false;
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dst.AppendElement(v);
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}
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return true;
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}
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nsresult
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JetpackActorCommon::RegisterReceiver(JSContext* cx,
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const nsString& messageName,
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jsval receiver)
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{
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if (JS_TypeOfValue(cx, receiver) != JSTYPE_FUNCTION)
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return NS_ERROR_INVALID_ARG;
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RecList* list;
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if (!mReceivers.Get(messageName, &list)) {
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list = new RecList(cx);
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if (!list || !mReceivers.Put(messageName, list)) {
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|
delete list;
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
}
|
|
|
|
list->add(receiver);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
JetpackActorCommon::UnregisterReceiver(const nsString& messageName,
|
|
jsval receiver)
|
|
{
|
|
RecList* list;
|
|
if (!mReceivers.Get(messageName, &list))
|
|
return;
|
|
list->remove(receiver);
|
|
}
|