mirror of
https://github.com/mozilla/gecko-dev.git
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732 lines
20 KiB
C++
732 lines
20 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 "mozilla/dom/ScriptSettings.h"
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#include "xpcprivate.h"
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#include "js/Class.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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// Note - Using AutoJSAPI (rather than AutoEntryScript) for a trap means
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// that we don't expect it to run script. For most of these traps that will only
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// happen if the target is a scripted proxy, which is probably something that we
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// don't want to support over CPOWs. When enough code is fixed up, the long-term
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// plan is to have the JS engine throw if it encounters script when it isn't
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// expecting it.
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using mozilla::dom::AutoJSAPI;
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using mozilla::dom::AutoEntryScript;
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bool
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WrapperAnswer::fail(AutoJSAPI& jsapi, 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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JSContext* cx = jsapi.cx();
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RootedValue exn(cx);
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if (!jsapi.HasException())
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return true;
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if (!jsapi.StealException(&exn))
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return true;
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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::ok(ReturnStatus* rs, const JS::ObjectOpResult& result)
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{
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*rs = result
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? ReturnStatus(ReturnSuccess())
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: ReturnStatus(ReturnObjectOpResult(result.failureCode()));
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return true;
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}
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bool
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WrapperAnswer::RecvPreventExtensions(const ObjectId& objId, ReturnStatus* rs)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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ObjectOpResult success;
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if (!JS_PreventExtensions(cx, obj, success))
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return fail(jsapi, rs);
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LOG("%s.preventExtensions()", ReceiverObj(objId));
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return ok(rs, success);
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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::RecvGetPropertyDescriptor(const ObjectId& objId, const JSIDVariant& idVar,
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ReturnStatus* rs, PPropertyDescriptor* out)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.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(jsapi, rs);
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LOG("%s.getPropertyDescriptor(%s)", ReceiverObj(objId), Identifier(idVar));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(jsapi, rs);
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Rooted<PropertyDescriptor> desc(cx);
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if (!JS_GetPropertyDescriptorById(cx, obj, id, &desc))
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return fail(jsapi, rs);
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if (!fromDescriptor(cx, desc, out))
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return fail(jsapi, rs);
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvGetOwnPropertyDescriptor(const ObjectId& objId, const JSIDVariant& idVar,
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ReturnStatus* rs, PPropertyDescriptor* out)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.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(jsapi, rs);
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LOG("%s.getOwnPropertyDescriptor(%s)", ReceiverObj(objId), Identifier(idVar));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(jsapi, rs);
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Rooted<PropertyDescriptor> desc(cx);
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if (!JS_GetOwnPropertyDescriptorById(cx, obj, id, &desc))
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return fail(jsapi, rs);
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if (!fromDescriptor(cx, desc, out))
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return fail(jsapi, rs);
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvDefineProperty(const ObjectId& objId, const JSIDVariant& idVar,
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const PPropertyDescriptor& descriptor, ReturnStatus* rs)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("define %s[%s]", ReceiverObj(objId), Identifier(idVar));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(jsapi, rs);
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Rooted<PropertyDescriptor> desc(cx);
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if (!toDescriptor(cx, descriptor, &desc))
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return fail(jsapi, rs);
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ObjectOpResult success;
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if (!JS_DefinePropertyById(cx, obj, id, desc, success))
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return fail(jsapi, rs);
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return ok(rs, success);
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}
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bool
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WrapperAnswer::RecvDelete(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("delete %s[%s]", ReceiverObj(objId), Identifier(idVar));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(jsapi, rs);
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ObjectOpResult success;
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if (!JS_DeletePropertyById(cx, obj, id, success))
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return fail(jsapi, rs);
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return ok(rs, success);
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}
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bool
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WrapperAnswer::RecvHas(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs,
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bool* foundp)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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*foundp = false;
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("%s.has(%s)", ReceiverObj(objId), Identifier(idVar));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(jsapi, rs);
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if (!JS_HasPropertyById(cx, obj, id, foundp))
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return fail(jsapi, rs);
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvHasOwn(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs,
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bool* foundp)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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*foundp = false;
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("%s.hasOwn(%s)", ReceiverObj(objId), Identifier(idVar));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(jsapi, rs);
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if (!JS_HasOwnPropertyById(cx, obj, id, foundp))
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return fail(jsapi, rs);
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvGet(const ObjectId& objId, const JSVariant& receiverVar,
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const JSIDVariant& idVar, ReturnStatus* rs, JSVariant* result)
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{
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// We may run scripted getters.
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AutoEntryScript aes(scopeForTargetObjects(),
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"Cross-Process Object Wrapper 'get'");
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JSContext* cx = aes.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(aes, rs);
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RootedValue receiver(cx);
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if (!fromVariant(cx, receiverVar, &receiver))
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return fail(aes, rs);
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(aes, rs);
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JS::RootedValue val(cx);
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if (!JS_ForwardGetPropertyTo(cx, obj, id, receiver, &val))
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return fail(aes, rs);
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if (!toVariant(cx, val, result))
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return fail(aes, rs);
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LOG("get %s.%s = %s", ReceiverObj(objId), Identifier(idVar), OutVariant(*result));
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvSet(const ObjectId& objId, const JSIDVariant& idVar, const JSVariant& value,
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const JSVariant& receiverVar, ReturnStatus* rs)
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{
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// We may run scripted setters.
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AutoEntryScript aes(scopeForTargetObjects(),
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"Cross-Process Object Wrapper 'set'");
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JSContext* cx = aes.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(aes, rs);
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LOG("set %s[%s] = %s", ReceiverObj(objId), Identifier(idVar), InVariant(value));
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RootedId id(cx);
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if (!fromJSIDVariant(cx, idVar, &id))
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return fail(aes, rs);
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RootedValue val(cx);
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if (!fromVariant(cx, value, &val))
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return fail(aes, rs);
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RootedValue receiver(cx);
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if (!fromVariant(cx, receiverVar, &receiver))
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return fail(aes, rs);
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ObjectOpResult result;
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if (!JS_ForwardSetPropertyTo(cx, obj, id, val, receiver, result))
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return fail(aes, rs);
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return ok(rs, result);
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}
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bool
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WrapperAnswer::RecvIsExtensible(const ObjectId& objId, ReturnStatus* rs, bool* result)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.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(jsapi, rs);
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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(jsapi, 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::RecvCallOrConstruct(const ObjectId& objId,
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InfallibleTArray<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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AutoEntryScript aes(scopeForTargetObjects(),
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"Cross-Process Object Wrapper call/construct");
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JSContext* cx = aes.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(aes, rs);
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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(aes, 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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RootedObject obj(cx, xpc::NewOutObject(cx));
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if (!obj)
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return fail(aes, rs);
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if (!outobjects.append(ObjectValue(*obj)))
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return fail(aes, rs);
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if (!vals.append(ObjectValue(*obj)))
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return fail(aes, 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(aes, rs);
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if (!vals.append(v))
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return fail(aes, rs);
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}
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}
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RootedValue rval(cx);
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{
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HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2);
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if (construct) {
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RootedObject obj(cx);
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if (!JS::Construct(cx, vals[0], args, &obj))
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return fail(aes, rs);
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rval.setObject(*obj);
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} else {
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if(!JS::Call(cx, vals[1], vals[0], args, &rval))
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return fail(aes, rs);
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}
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}
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if (!toVariant(cx, rval, result))
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return fail(aes, 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(aes, 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(aes, 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(aes, 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::RecvHasInstance(const ObjectId& objId, const JSVariant& vVar, ReturnStatus* rs, bool* bp)
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{
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("%s.hasInstance(%s)", ReceiverObj(objId), InVariant(vVar));
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RootedValue val(cx);
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if (!fromVariant(cx, vVar, &val))
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return fail(jsapi, rs);
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if (!JS_HasInstance(cx, obj, val, bp))
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return fail(jsapi, rs);
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvGetBuiltinClass(const ObjectId& objId, ReturnStatus* rs,
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uint32_t* classValue)
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{
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*classValue = uint32_t(js::ESClass::Other);
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("%s.getBuiltinClass()", ReceiverObj(objId));
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js::ESClass cls;
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if (!js::GetBuiltinClass(cx, obj, &cls))
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return fail(jsapi, rs);
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*classValue = uint32_t(cls);
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return ok(rs);
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}
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bool
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WrapperAnswer::RecvIsArray(const ObjectId& objId, ReturnStatus* rs,
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uint32_t* ans)
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{
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*ans = uint32_t(IsArrayAnswer::NotArray);
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AutoJSAPI jsapi;
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if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
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return false;
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JSContext* cx = jsapi.cx();
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RootedObject obj(cx, findObjectById(cx, objId));
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if (!obj)
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return fail(jsapi, rs);
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LOG("%s.isArray()", ReceiverObj(objId));
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IsArrayAnswer answer;
|
|
if (!JS::IsArray(cx, obj, &answer))
|
|
return fail(jsapi, rs);
|
|
|
|
*ans = uint32_t(answer);
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvClassName(const ObjectId& objId, nsCString* name)
|
|
{
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj) {
|
|
// This is very unfortunate, but we have no choice.
|
|
*name = "<dead CPOW>";
|
|
return true;
|
|
}
|
|
|
|
LOG("%s.className()", ReceiverObj(objId));
|
|
|
|
*name = js::ObjectClassName(cx, obj);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvGetPrototype(const ObjectId& objId, ReturnStatus* rs, ObjectOrNullVariant* result)
|
|
{
|
|
*result = NullVariant();
|
|
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(jsapi, rs);
|
|
|
|
JS::RootedObject proto(cx);
|
|
if (!JS_GetPrototype(cx, obj, &proto))
|
|
return fail(jsapi, rs);
|
|
|
|
if (!toObjectOrNullVariant(cx, proto, result))
|
|
return fail(jsapi, rs);
|
|
|
|
LOG("getPrototype(%s)", ReceiverObj(objId));
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvGetPrototypeIfOrdinary(const ObjectId& objId, ReturnStatus* rs, bool* isOrdinary,
|
|
ObjectOrNullVariant* result)
|
|
{
|
|
*result = NullVariant();
|
|
*isOrdinary = false;
|
|
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(jsapi, rs);
|
|
|
|
JS::RootedObject proto(cx);
|
|
if (!JS_GetPrototypeIfOrdinary(cx, obj, isOrdinary, &proto))
|
|
return fail(jsapi, rs);
|
|
|
|
if (!toObjectOrNullVariant(cx, proto, result))
|
|
return fail(jsapi, rs);
|
|
|
|
LOG("getPrototypeIfOrdinary(%s)", ReceiverObj(objId));
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvRegExpToShared(const ObjectId& objId, ReturnStatus* rs,
|
|
nsString* source, uint32_t* flags)
|
|
{
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(jsapi, rs);
|
|
|
|
RootedString sourceJSStr(cx, JS_GetRegExpSource(cx, obj));
|
|
if (!sourceJSStr)
|
|
return fail(jsapi, rs);
|
|
nsAutoJSString sourceStr;
|
|
if (!sourceStr.init(cx, sourceJSStr))
|
|
return fail(jsapi, rs);
|
|
source->Assign(sourceStr);
|
|
|
|
*flags = JS_GetRegExpFlags(cx, obj);
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvGetPropertyKeys(const ObjectId& objId, const uint32_t& flags,
|
|
ReturnStatus* rs, nsTArray<JSIDVariant>* ids)
|
|
{
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(jsapi, rs);
|
|
|
|
LOG("%s.getPropertyKeys()", ReceiverObj(objId));
|
|
|
|
AutoIdVector props(cx);
|
|
if (!js::GetPropertyKeys(cx, obj, flags, &props))
|
|
return fail(jsapi, rs);
|
|
|
|
for (size_t i = 0; i < props.length(); i++) {
|
|
JSIDVariant id;
|
|
if (!toJSIDVariant(cx, props[i], &id))
|
|
return fail(jsapi, rs);
|
|
|
|
ids->AppendElement(id);
|
|
}
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvInstanceOf(const ObjectId& objId, const JSIID& iid, ReturnStatus* rs,
|
|
bool* instanceof)
|
|
{
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
|
|
*instanceof = false;
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(jsapi, rs);
|
|
|
|
LOG("%s.instanceOf()", ReceiverObj(objId));
|
|
|
|
nsID nsiid;
|
|
ConvertID(iid, &nsiid);
|
|
|
|
nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof);
|
|
if (rv != NS_OK)
|
|
return fail(jsapi, rs);
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvDOMInstanceOf(const ObjectId& objId, const int& prototypeID,
|
|
const int& depth, ReturnStatus* rs, bool* instanceof)
|
|
{
|
|
AutoJSAPI jsapi;
|
|
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
|
|
return false;
|
|
JSContext* cx = jsapi.cx();
|
|
*instanceof = false;
|
|
|
|
RootedObject obj(cx, findObjectById(cx, objId));
|
|
if (!obj)
|
|
return fail(jsapi, rs);
|
|
|
|
LOG("%s.domInstanceOf()", ReceiverObj(objId));
|
|
|
|
bool tmp;
|
|
if (!mozilla::dom::InterfaceHasInstance(cx, prototypeID, depth, obj, &tmp))
|
|
return fail(jsapi, rs);
|
|
*instanceof = tmp;
|
|
|
|
return ok(rs);
|
|
}
|
|
|
|
bool
|
|
WrapperAnswer::RecvDropObject(const ObjectId& objId)
|
|
{
|
|
JSObject* obj = objects_.find(objId);
|
|
if (obj) {
|
|
objectIdMap(objId.hasXrayWaiver()).remove(obj);
|
|
objects_.remove(objId);
|
|
}
|
|
return true;
|
|
}
|