mirror of
https://github.com/mozilla/gecko-dev.git
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624 lines
16 KiB
C++
624 lines
16 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 "WrapperAnswer.h"
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#include "JavaScriptLogging.h"
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#include "mozilla/dom/ContentChild.h"
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#include "mozilla/dom/BindingUtils.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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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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bool
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WrapperAnswer::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(ReturnException(JSVariant(UndefinedVariant())));
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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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RootedValue exn(cx);
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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 (JS_IsStopIteration(exn)) {
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*rs = ReturnStatus(ReturnStopIteration());
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return true;
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}
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// If this fails, we still don't want to exit. Just return an invalid
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// exception.
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(void) toVariant(cx, exn, &rs->get_ReturnException().exn());
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return true;
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}
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bool
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WrapperAnswer::ok(ReturnStatus *rs)
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{
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*rs = ReturnStatus(ReturnSuccess());
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return true;
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}
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bool
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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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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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LOG("%s.preventExtensions()", ReceiverObj(objId));
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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->obj() = LocalObject(0);
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desc->attrs() = 0;
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desc->value() = UndefinedVariant();
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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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WrapperAnswer::AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
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ReturnStatus *rs, 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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("%s.getPropertyDescriptor(%s)", ReceiverObj(objId), id);
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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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Rooted<JSPropertyDescriptor> desc(cx);
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if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
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return fail(cx, rs);
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if (!desc.object())
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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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WrapperAnswer::AnswerGetOwnPropertyDescriptor(const ObjectId &objId, const nsString &id,
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ReturnStatus *rs, 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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("%s.getOwnPropertyDescriptor(%s)", ReceiverObj(objId), id);
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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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Rooted<JSPropertyDescriptor> desc(cx);
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if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
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return fail(cx, rs);
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if (desc.object() != 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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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("define %s[%s]", ReceiverObj(objId), id);
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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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Rooted<JSPropertyDescriptor> desc(cx);
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if (!toDescriptor(cx, descriptor, &desc))
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return fail(cx, rs);
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if (!js::CheckDefineProperty(cx, obj, internedId, desc.value(), desc.attributes(),
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desc.getter(), desc.setter()))
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{
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return fail(cx, rs);
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}
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if (!JS_DefinePropertyById(cx, obj, internedId, desc.value(), desc.attributes(),
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desc.getter(), desc.setter()))
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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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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("delete %s[%s]", ReceiverObj(objId), id);
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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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if (!JS_DeletePropertyById2(cx, obj, internedId, success))
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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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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("%s.has(%s)", ReceiverObj(objId), id);
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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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bool 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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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("%s.hasOwn(%s)", ReceiverObj(objId), id);
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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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Rooted<JSPropertyDescriptor> desc(cx);
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if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
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return fail(cx, rs);
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*bp = (desc.object() == obj);
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return ok(rs);
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}
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bool
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WrapperAnswer::AnswerGet(const ObjectId &objId, const ObjectVariant &receiverVar, 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 = UndefinedVariant();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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RootedObject receiver(cx, fromObjectVariant(cx, receiverVar));
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if (!receiver)
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return fail(cx, rs);
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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::RootedValue val(cx);
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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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LOG("get %s.%s = %s", ReceiverObj(objId), id, OutVariant(*result));
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return ok(rs);
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}
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bool
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WrapperAnswer::AnswerSet(const ObjectId &objId, const ObjectVariant &receiverVar, 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 = UndefinedVariant();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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RootedObject receiver(cx, fromObjectVariant(cx, receiverVar));
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if (!receiver)
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return fail(cx, rs);
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LOG("set %s[%s] = %s", ReceiverObj(objId), id, InVariant(value));
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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 (!fromVariant(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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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("%s.isExtensible()", ReceiverObj(objId));
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bool 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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WrapperAnswer::AnswerCallOrConstruct(const ObjectId &objId,
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const nsTArray<JSParam> &argv,
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const bool &construct,
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ReturnStatus *rs,
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JSVariant *result,
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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 = UndefinedVariant();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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MOZ_ASSERT(argv.Length() >= 2);
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RootedValue objv(cx);
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if (!fromVariant(cx, argv[0], &objv))
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return fail(cx, rs);
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*result = JSVariant(UndefinedVariant());
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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 (!fromVariant(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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RootedValue rval(cx);
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{
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AutoSaveContextOptions asco(cx);
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ContextOptionsRef(cx).setDontReportUncaught(true);
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HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2);
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bool success;
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if (construct)
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success = JS::Construct(cx, vals[0], args, &rval);
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else
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success = JS::Call(cx, vals[1], vals[0], args, &rval);
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if (!success)
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return fail(cx, rs);
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}
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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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RootedValue v(cx);
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bool 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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LOG("%s.call(%s) = %s", ReceiverObj(objId), argv, OutVariant(*result));
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return ok(rs);
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}
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bool
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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj) {
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// This is very unfortunate, but we have no choice.
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*result = false;
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return true;
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}
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JSAutoCompartment comp(cx, obj);
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LOG("%s.objectClassIs()", ReceiverObj(objId));
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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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WrapperAnswer::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, findObjectById(cx, objId));
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if (!obj) {
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// This is very unfortunate, but we have no choice.
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return "<dead CPOW>";
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}
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JSAutoCompartment comp(cx, obj);
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LOG("%s.className()", ReceiverObj(objId));
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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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WrapperAnswer::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;
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JSAutoRequest request(cx);
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(cx, rs);
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JSAutoCompartment comp(cx, obj);
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LOG("%s.getPropertyNames()", ReceiverObj(objId));
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AutoIdVector props(cx);
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if (!js::GetPropertyNames(cx, obj, flags, &props))
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return fail(cx, rs);
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for (size_t i = 0; i < props.length(); i++) {
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nsString name;
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if (!convertIdToGeckoString(cx, props[i], &name))
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return fail(cx, rs);
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names->AppendElement(name);
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}
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::AnswerInstanceOf(const ObjectId &objId, const JSIID &iid, ReturnStatus *rs,
|
|
bool *instanceof)
|
|
{
|
|
AutoSafeJSContext cx;
|
|
JSAutoRequest request(cx);
|
|
|
|
*instanceof = false;
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(cx, rs);
|
|
|
|
JSAutoCompartment comp(cx, obj);
|
|
|
|
LOG("%s.instanceOf()", ReceiverObj(objId));
|
|
|
|
nsID nsiid;
|
|
ConvertID(iid, &nsiid);
|
|
|
|
nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof);
|
|
if (rv != NS_OK)
|
|
return fail(cx, rs);
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::AnswerDOMInstanceOf(const ObjectId &objId, const int &prototypeID,
|
|
const int &depth,
|
|
ReturnStatus *rs, bool *instanceof)
|
|
{
|
|
AutoSafeJSContext cx;
|
|
JSAutoRequest request(cx);
|
|
|
|
*instanceof = false;
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(cx, rs);
|
|
|
|
JSAutoCompartment comp(cx, obj);
|
|
|
|
LOG("%s.domInstanceOf()", ReceiverObj(objId));
|
|
|
|
bool tmp;
|
|
if (!mozilla::dom::InterfaceHasInstance(cx, prototypeID, depth, obj, &tmp))
|
|
return fail(cx, rs);
|
|
*instanceof = tmp;
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvDropObject(const ObjectId &objId)
|
|
{
|
|
JSObject *obj = findObjectById(objId);
|
|
if (obj) {
|
|
objectIds_.remove(obj);
|
|
objects_.remove(objId);
|
|
}
|
|
return true;
|
|
}
|