forked from mirrors/gecko-dev
627 lines
15 KiB
C++
627 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 sw=4 et tw=80:
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "JavaScriptChild.h"
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#include "mozilla/dom/ContentChild.h"
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#include "nsContentUtils.h"
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#include "xpcprivate.h"
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#include "jsfriendapi.h"
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#include "nsCxPusher.h"
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using namespace JS;
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using namespace mozilla;
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using namespace mozilla::jsipc;
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using mozilla::AutoSafeJSContext;
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JavaScriptChild::JavaScriptChild(JSRuntime *rt)
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: lastId_(0),
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rt_(rt)
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{
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}
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static void
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Trace(JSTracer *trc, void *data)
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{
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reinterpret_cast<JavaScriptChild *>(data)->trace(trc);
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}
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JavaScriptChild::~JavaScriptChild()
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{
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JS_RemoveExtraGCRootsTracer(rt_, Trace, this);
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}
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void
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JavaScriptChild::trace(JSTracer *trc)
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{
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objects_.trace(trc);
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ids_.trace(trc);
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}
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bool
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JavaScriptChild::init()
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{
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if (!JavaScriptShared::init())
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return false;
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if (!ids_.init())
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return false;
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JS_AddExtraGCRootsTracer(rt_, Trace, this);
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return true;
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}
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bool
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JavaScriptChild::RecvDropObject(const ObjectId &objId)
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{
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JSObject *obj = findObject(objId);
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if (obj) {
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ids_.remove(obj);
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objects_.remove(objId);
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}
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return true;
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}
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bool
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JavaScriptChild::makeId(JSContext *cx, JSObject *obj, ObjectId *idp)
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{
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if (!obj) {
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*idp = 0;
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return true;
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}
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ObjectId id = ids_.find(obj);
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if (id) {
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*idp = id;
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return true;
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}
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id = ++lastId_;
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if (id > MAX_CPOW_IDS) {
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JS_ReportError(cx, "CPOW id limit reached");
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return false;
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}
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id <<= OBJECT_EXTRA_BITS;
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if (JS_ObjectIsCallable(cx, obj))
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id |= OBJECT_IS_CALLABLE;
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if (!objects_.add(id, obj))
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return false;
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if (!ids_.add(obj, id))
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return false;
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*idp = id;
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return true;
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}
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JSObject *
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JavaScriptChild::unwrap(JSContext *cx, ObjectId id)
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{
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JSObject *obj = findObject(id);
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MOZ_ASSERT(obj);
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return obj;
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}
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bool
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JavaScriptChild::fail(JSContext *cx, ReturnStatus *rs)
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{
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// By default, we set |undefined| unless we can get a more meaningful
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// exception.
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*rs = ReturnStatus(false, JSVariant(void_t()));
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// Note we always return true from this function, since this propagates
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// to the IPC code, and we don't want a JS failure to cause the death
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// of the child process.
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jsval exn;
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if (!JS_GetPendingException(cx, &exn))
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return true;
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// If we don't clear the pending exception, JS will try to wrap it as it
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// leaves the current compartment. Since there is no previous compartment,
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// that would crash.
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JS_ClearPendingException(cx);
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if (!toVariant(cx, exn, &rs->exn()))
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return true;
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return true;
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}
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bool
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JavaScriptChild::ok(ReturnStatus *rs)
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{
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*rs = ReturnStatus(true, JSVariant(void_t()));
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return true;
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}
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bool
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JavaScriptChild::AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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if (!JS_PreventExtensions(cx, obj))
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return fail(cx, rs);
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return ok(rs);
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}
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static void
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EmptyDesc(PPropertyDescriptor *desc)
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{
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desc->objId() = 0;
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desc->attrs() = 0;
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desc->shortid() = 0;
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desc->value() = void_t();
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desc->getter() = 0;
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desc->setter() = 0;
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}
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bool
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JavaScriptChild::AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
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const uint32_t &flags, ReturnStatus *rs,
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PPropertyDescriptor *out)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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EmptyDesc(out);
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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JSPropertyDescriptor desc;
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if (!JS_GetPropertyDescriptorById(cx, obj, internedId, flags, &desc))
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return fail(cx, rs);
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if (!desc.obj)
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return ok(rs);
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if (!fromDescriptor(cx, desc, out))
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return fail(cx, rs);
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerGetOwnPropertyDescriptor(const ObjectId &objId, const nsString &id,
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const uint32_t &flags, ReturnStatus *rs,
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PPropertyDescriptor *out)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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EmptyDesc(out);
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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JSPropertyDescriptor desc;
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if (!JS_GetPropertyDescriptorById(cx, obj, internedId, flags, &desc))
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return fail(cx, rs);
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if (desc.obj != obj)
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return ok(rs);
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if (!fromDescriptor(cx, desc, out))
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return fail(cx, rs);
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerDefineProperty(const ObjectId &objId, const nsString &id,
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const PPropertyDescriptor &descriptor, ReturnStatus *rs)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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JSPropertyDescriptor desc;
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if (!toDescriptor(cx, descriptor, &desc))
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return false;
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RootedValue v(cx, desc.value);
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if (!js::CheckDefineProperty(cx, obj, internedId, v, desc.getter, desc.setter, desc.attrs) ||
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!JS_DefinePropertyById(cx, obj, internedId, v, desc.getter, desc.setter, desc.attrs))
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{
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return fail(cx, rs);
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}
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerDelete(const ObjectId &objId, const nsString &id, ReturnStatus *rs,
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bool *success)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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*success = false;
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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RootedValue v(cx);
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if (!JS_DeletePropertyById2(cx, obj, internedId, v.address()))
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return fail(cx, rs);
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JSBool b;
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if (!JS_ValueToBoolean(cx, v, &b))
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return fail(cx, rs);
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*success = !!b;
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerHas(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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*bp = false;
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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JSBool found;
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if (!JS_HasPropertyById(cx, obj, internedId, &found))
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return fail(cx, rs);
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*bp = !!found;
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerHasOwn(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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*bp = false;
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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JSPropertyDescriptor desc;
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if (!JS_GetPropertyDescriptorById(cx, obj, internedId, 0, &desc))
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return fail(cx, rs);
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*bp = (desc.obj == obj);
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerGet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
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ReturnStatus *rs, JSVariant *result)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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// The outparam will be written to the buffer, so it must be set even if
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// the parent won't read it.
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*result = void_t();
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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RootedObject receiver(cx, findObject(receiverId));
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if (!receiver)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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JS::Value val;
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if (!JS_ForwardGetPropertyTo(cx, obj, internedId, receiver, &val))
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return fail(cx, rs);
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if (!toVariant(cx, val, result))
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return fail(cx, rs);
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerSet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
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const bool &strict, const JSVariant &value, ReturnStatus *rs,
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JSVariant *result)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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// The outparam will be written to the buffer, so it must be set even if
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// the parent won't read it.
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*result = void_t();
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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RootedObject receiver(cx, findObject(receiverId));
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if (!receiver)
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return false;
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JSAutoCompartment comp(cx, obj);
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RootedId internedId(cx);
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if (!convertGeckoStringToId(cx, id, &internedId))
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return fail(cx, rs);
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MOZ_ASSERT(obj == receiver);
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RootedValue val(cx);
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if (!toValue(cx, value, &val))
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return fail(cx, rs);
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if (!JS_SetPropertyById(cx, obj, internedId, val))
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return fail(cx, rs);
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if (!toVariant(cx, val, result))
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return fail(cx, rs);
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs, bool *result)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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*result = false;
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSBool extensible;
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if (!JS_IsExtensible(cx, obj, &extensible))
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return fail(cx, rs);
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*result = !!extensible;
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv, ReturnStatus *rs,
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JSVariant *result, nsTArray<JSParam> *outparams)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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// The outparam will be written to the buffer, so it must be set even if
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// the parent won't read it.
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*result = void_t();
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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MOZ_ASSERT(argv.Length() >= 2);
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RootedValue objv(cx);
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if (!toValue(cx, argv[0], &objv))
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return fail(cx, rs);
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JSAutoCompartment comp(cx, &objv.toObject());
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*result = JSVariant(void_t());
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AutoValueVector vals(cx);
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AutoValueVector outobjects(cx);
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for (size_t i = 0; i < argv.Length(); i++) {
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if (argv[i].type() == JSParam::Tvoid_t) {
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// This is an outparam.
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JSCompartment *compartment = js::GetContextCompartment(cx);
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RootedObject global(cx, JS_GetGlobalForCompartmentOrNull(cx, compartment));
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RootedObject obj(cx, xpc::NewOutObject(cx, global));
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if (!obj)
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return fail(cx, rs);
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if (!outobjects.append(ObjectValue(*obj)))
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return fail(cx, rs);
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if (!vals.append(ObjectValue(*obj)))
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return fail(cx, rs);
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} else {
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RootedValue v(cx);
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if (!toValue(cx, argv[i].get_JSVariant(), &v))
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return fail(cx, rs);
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if (!vals.append(v))
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return fail(cx, rs);
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}
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}
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uint32_t oldOpts =
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JS_SetOptions(cx, JS_GetOptions(cx) | JSOPTION_DONT_REPORT_UNCAUGHT);
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RootedValue rval(cx);
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bool success = JS::Call(cx, vals[1], vals[0], vals.length() - 2, vals.begin() + 2, &rval);
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JS_SetOptions(cx, oldOpts);
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if (!success)
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return fail(cx, rs);
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if (!toVariant(cx, rval, result))
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return fail(cx, rs);
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// Prefill everything with a dummy jsval.
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for (size_t i = 0; i < outobjects.length(); i++)
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outparams->AppendElement(JSParam(void_t()));
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// Go through each argument that was an outparam, retrieve the "value"
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// field, and add it to a temporary list. We need to do this separately
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// because the outparams vector is not rooted.
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vals.clear();
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for (size_t i = 0; i < outobjects.length(); i++) {
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RootedObject obj(cx, &outobjects[i].toObject());
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jsval v;
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JSBool found;
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if (JS_HasProperty(cx, obj, "value", &found)) {
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if (!JS_GetProperty(cx, obj, "value", &v))
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return fail(cx, rs);
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} else {
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v = UndefinedValue();
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}
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if (!vals.append(v))
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return fail(cx, rs);
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}
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// Copy the outparams. If any outparam is already set to a void_t, we
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// treat this as the outparam never having been set.
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for (size_t i = 0; i < vals.length(); i++) {
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JSVariant variant;
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if (!toVariant(cx, vals[i], &variant))
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return fail(cx, rs);
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outparams->ReplaceElementAt(i, JSParam(variant));
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}
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return ok(rs);
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}
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bool
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JavaScriptChild::AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
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bool *result)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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*result = js_ObjectClassIs(cx, obj, (js::ESClassValue)classValue);
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return true;
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}
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bool
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JavaScriptChild::AnswerClassName(const ObjectId &objId, nsString *name)
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{
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AutoSafeJSContext cx;
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JSAutoRequest request(cx);
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RootedObject obj(cx, findObject(objId));
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if (!obj)
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return false;
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JSAutoCompartment comp(cx, obj);
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*name = NS_ConvertASCIItoUTF16(js_ObjectClassName(cx, obj));
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return true;
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}
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bool
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JavaScriptChild::AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
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ReturnStatus *rs, nsTArray<nsString> *names)
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{
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|
AutoSafeJSContext cx;
|
|
JSAutoRequest request(cx);
|
|
|
|
RootedObject obj(cx, findObject(objId));
|
|
if (!obj)
|
|
return false;
|
|
|
|
JSAutoCompartment comp(cx, obj);
|
|
|
|
AutoIdVector props(cx);
|
|
if (!js::GetPropertyNames(cx, obj, flags, &props))
|
|
return fail(cx, rs);
|
|
|
|
for (size_t i = 0; i < props.length(); i++) {
|
|
nsString name;
|
|
if (!convertIdToGeckoString(cx, props.handleAt(i), &name))
|
|
return fail(cx, rs);
|
|
|
|
names->AppendElement(name);
|
|
}
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
JavaScriptChild::AnswerInstanceOf(const ObjectId &objId, const JSIID &iid, ReturnStatus *rs,
|
|
bool *instanceof)
|
|
{
|
|
AutoSafeJSContext cx;
|
|
JSAutoRequest request(cx);
|
|
|
|
*instanceof = false;
|
|
|
|
RootedObject obj(cx, findObject(objId));
|
|
if (!obj)
|
|
return false;
|
|
|
|
JSAutoCompartment comp(cx, obj);
|
|
|
|
nsID nsiid;
|
|
ConvertID(iid, &nsiid);
|
|
|
|
nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof);
|
|
if (rv != NS_OK)
|
|
return fail(cx, rs);
|
|
|
|
return ok(rs);
|
|
}
|