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gecko-dev/js/ipc/WrapperAnswer.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=80:
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WrapperAnswer.h"
#include "JavaScriptLogging.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/ScriptSettings.h"
#include "xpcprivate.h"
#include "js/Class.h"
#include "jsfriendapi.h"
using namespace JS;
using namespace mozilla;
using namespace mozilla::jsipc;
// Note - Using AutoJSAPI (rather than AutoEntryScript) for a trap means
// that we don't expect it to run script. For most of these traps that will only
// happen if the target is a scripted proxy, which is probably something that we
// don't want to support over CPOWs. When enough code is fixed up, the long-term
// plan is to have the JS engine throw if it encounters script when it isn't
// expecting it.
using mozilla::dom::AutoJSAPI;
using mozilla::dom::AutoEntryScript;
static void
MaybeForceDebugGC()
{
static bool sEnvVarInitialized = false;
static bool sDebugGCs = false;
if (!sEnvVarInitialized)
sDebugGCs = !!PR_GetEnv("MOZ_DEBUG_DEAD_CPOWS");
if (sDebugGCs) {
JSContext* cx = nsXPConnect::GetContextInstance()->Context();
PrepareForFullGC(cx);
GCForReason(cx, GC_NORMAL, gcreason::COMPONENT_UTILS);
}
}
bool
WrapperAnswer::fail(AutoJSAPI& jsapi, ReturnStatus* rs)
{
// By default, we set |undefined| unless we can get a more meaningful
// exception.
*rs = ReturnStatus(ReturnException(JSVariant(UndefinedVariant())));
// Note we always return true from this function, since this propagates
// to the IPC code, and we don't want a JS failure to cause the death
// of the child process.
JSContext* cx = jsapi.cx();
RootedValue exn(cx);
if (!jsapi.HasException())
return true;
if (!jsapi.StealException(&exn))
return true;
if (JS_IsStopIteration(exn)) {
*rs = ReturnStatus(ReturnStopIteration());
return true;
}
// If this fails, we still don't want to exit. Just return an invalid
// exception.
(void) toVariant(cx, exn, &rs->get_ReturnException().exn());
return true;
}
bool
WrapperAnswer::ok(ReturnStatus* rs)
{
*rs = ReturnStatus(ReturnSuccess());
return true;
}
bool
WrapperAnswer::ok(ReturnStatus* rs, const JS::ObjectOpResult& result)
{
*rs = result
? ReturnStatus(ReturnSuccess())
: ReturnStatus(ReturnObjectOpResult(result.failureCode()));
return true;
}
bool
WrapperAnswer::deadCPOW(AutoJSAPI& jsapi, ReturnStatus* rs)
{
JSContext* cx = jsapi.cx();
JS_ClearPendingException(cx);
*rs = ReturnStatus(ReturnDeadCPOW());
return true;
}
bool
WrapperAnswer::RecvPreventExtensions(const ObjectId& objId, ReturnStatus* rs)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
ObjectOpResult success;
if (!JS_PreventExtensions(cx, obj, success))
return fail(jsapi, rs);
LOG("%s.preventExtensions()", ReceiverObj(objId));
return ok(rs, success);
}
static void
EmptyDesc(PPropertyDescriptor* desc)
{
desc->obj() = LocalObject(0);
desc->attrs() = 0;
desc->value() = UndefinedVariant();
desc->getter() = 0;
desc->setter() = 0;
}
bool
WrapperAnswer::RecvGetPropertyDescriptor(const ObjectId& objId, const JSIDVariant& idVar,
ReturnStatus* rs, PPropertyDescriptor* out)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
EmptyDesc(out);
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.getPropertyDescriptor(%s)", ReceiverObj(objId), Identifier(idVar));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(jsapi, rs);
Rooted<PropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, id, &desc))
return fail(jsapi, rs);
if (!fromDescriptor(cx, desc, out))
return fail(jsapi, rs);
return ok(rs);
}
bool
WrapperAnswer::RecvGetOwnPropertyDescriptor(const ObjectId& objId, const JSIDVariant& idVar,
ReturnStatus* rs, PPropertyDescriptor* out)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
EmptyDesc(out);
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.getOwnPropertyDescriptor(%s)", ReceiverObj(objId), Identifier(idVar));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(jsapi, rs);
Rooted<PropertyDescriptor> desc(cx);
if (!JS_GetOwnPropertyDescriptorById(cx, obj, id, &desc))
return fail(jsapi, rs);
if (!fromDescriptor(cx, desc, out))
return fail(jsapi, rs);
return ok(rs);
}
bool
WrapperAnswer::RecvDefineProperty(const ObjectId& objId, const JSIDVariant& idVar,
const PPropertyDescriptor& descriptor, ReturnStatus* rs)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("define %s[%s]", ReceiverObj(objId), Identifier(idVar));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(jsapi, rs);
Rooted<PropertyDescriptor> desc(cx);
if (!toDescriptor(cx, descriptor, &desc))
return fail(jsapi, rs);
ObjectOpResult success;
if (!JS_DefinePropertyById(cx, obj, id, desc, success))
return fail(jsapi, rs);
return ok(rs, success);
}
bool
WrapperAnswer::RecvDelete(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("delete %s[%s]", ReceiverObj(objId), Identifier(idVar));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(jsapi, rs);
ObjectOpResult success;
if (!JS_DeletePropertyById(cx, obj, id, success))
return fail(jsapi, rs);
return ok(rs, success);
}
bool
WrapperAnswer::RecvHas(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs,
bool* foundp)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
*foundp = false;
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.has(%s)", ReceiverObj(objId), Identifier(idVar));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(jsapi, rs);
if (!JS_HasPropertyById(cx, obj, id, foundp))
return fail(jsapi, rs);
return ok(rs);
}
bool
WrapperAnswer::RecvHasOwn(const ObjectId& objId, const JSIDVariant& idVar, ReturnStatus* rs,
bool* foundp)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
*foundp = false;
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.hasOwn(%s)", ReceiverObj(objId), Identifier(idVar));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(jsapi, rs);
if (!JS_HasOwnPropertyById(cx, obj, id, foundp))
return fail(jsapi, rs);
return ok(rs);
}
bool
WrapperAnswer::RecvGet(const ObjectId& objId, const JSVariant& receiverVar,
const JSIDVariant& idVar, ReturnStatus* rs, JSVariant* result)
{
MaybeForceDebugGC();
// We may run scripted getters.
AutoEntryScript aes(scopeForTargetObjects(),
"Cross-Process Object Wrapper 'get'");
JSContext* cx = aes.cx();
// The outparam will be written to the buffer, so it must be set even if
// the parent won't read it.
*result = UndefinedVariant();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(aes, rs);
RootedValue receiver(cx);
if (!fromVariant(cx, receiverVar, &receiver))
return fail(aes, rs);
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(aes, rs);
JS::RootedValue val(cx);
if (!JS_ForwardGetPropertyTo(cx, obj, id, receiver, &val))
return fail(aes, rs);
if (!toVariant(cx, val, result))
return fail(aes, rs);
LOG("get %s.%s = %s", ReceiverObj(objId), Identifier(idVar), OutVariant(*result));
return ok(rs);
}
bool
WrapperAnswer::RecvSet(const ObjectId& objId, const JSIDVariant& idVar, const JSVariant& value,
const JSVariant& receiverVar, ReturnStatus* rs)
{
MaybeForceDebugGC();
// We may run scripted setters.
AutoEntryScript aes(scopeForTargetObjects(),
"Cross-Process Object Wrapper 'set'");
JSContext* cx = aes.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(aes, rs);
LOG("set %s[%s] = %s", ReceiverObj(objId), Identifier(idVar), InVariant(value));
RootedId id(cx);
if (!fromJSIDVariant(cx, idVar, &id))
return fail(aes, rs);
RootedValue val(cx);
if (!fromVariant(cx, value, &val))
return fail(aes, rs);
RootedValue receiver(cx);
if (!fromVariant(cx, receiverVar, &receiver))
return fail(aes, rs);
ObjectOpResult result;
if (!JS_ForwardSetPropertyTo(cx, obj, id, val, receiver, result))
return fail(aes, rs);
return ok(rs, result);
}
bool
WrapperAnswer::RecvIsExtensible(const ObjectId& objId, ReturnStatus* rs, bool* result)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
*result = false;
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.isExtensible()", ReceiverObj(objId));
bool extensible;
if (!JS_IsExtensible(cx, obj, &extensible))
return fail(jsapi, rs);
*result = !!extensible;
return ok(rs);
}
bool
WrapperAnswer::RecvCallOrConstruct(const ObjectId& objId,
InfallibleTArray<JSParam>&& argv,
const bool& construct,
ReturnStatus* rs,
JSVariant* result,
nsTArray<JSParam>* outparams)
{
MaybeForceDebugGC();
AutoEntryScript aes(scopeForTargetObjects(),
"Cross-Process Object Wrapper call/construct");
JSContext* cx = aes.cx();
// The outparam will be written to the buffer, so it must be set even if
// the parent won't read it.
*result = UndefinedVariant();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(aes, rs);
MOZ_ASSERT(argv.Length() >= 2);
RootedValue objv(cx);
if (!fromVariant(cx, argv[0], &objv))
return fail(aes, rs);
*result = JSVariant(UndefinedVariant());
AutoValueVector vals(cx);
AutoValueVector outobjects(cx);
for (size_t i = 0; i < argv.Length(); i++) {
if (argv[i].type() == JSParam::Tvoid_t) {
// This is an outparam.
RootedObject obj(cx, xpc::NewOutObject(cx));
if (!obj)
return fail(aes, rs);
if (!outobjects.append(ObjectValue(*obj)))
return fail(aes, rs);
if (!vals.append(ObjectValue(*obj)))
return fail(aes, rs);
} else {
RootedValue v(cx);
if (!fromVariant(cx, argv[i].get_JSVariant(), &v))
return fail(aes, rs);
if (!vals.append(v))
return fail(aes, rs);
}
}
RootedValue rval(cx);
{
HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2);
if (construct) {
RootedObject obj(cx);
if (!JS::Construct(cx, vals[0], args, &obj))
return fail(aes, rs);
rval.setObject(*obj);
} else {
if(!JS::Call(cx, vals[1], vals[0], args, &rval))
return fail(aes, rs);
}
}
if (!toVariant(cx, rval, result))
return fail(aes, rs);
// Prefill everything with a dummy jsval.
for (size_t i = 0; i < outobjects.length(); i++)
outparams->AppendElement(JSParam(void_t()));
// Go through each argument that was an outparam, retrieve the "value"
// field, and add it to a temporary list. We need to do this separately
// because the outparams vector is not rooted.
vals.clear();
for (size_t i = 0; i < outobjects.length(); i++) {
RootedObject obj(cx, &outobjects[i].toObject());
RootedValue v(cx);
bool found;
if (JS_HasProperty(cx, obj, "value", &found)) {
if (!JS_GetProperty(cx, obj, "value", &v))
return fail(aes, rs);
} else {
v = UndefinedValue();
}
if (!vals.append(v))
return fail(aes, rs);
}
// Copy the outparams. If any outparam is already set to a void_t, we
// treat this as the outparam never having been set.
for (size_t i = 0; i < vals.length(); i++) {
JSVariant variant;
if (!toVariant(cx, vals[i], &variant))
return fail(aes, rs);
outparams->ReplaceElementAt(i, JSParam(variant));
}
LOG("%s.call(%s) = %s", ReceiverObj(objId), argv, OutVariant(*result));
return ok(rs);
}
bool
WrapperAnswer::RecvHasInstance(const ObjectId& objId, const JSVariant& vVar, ReturnStatus* rs, bool* bp)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.hasInstance(%s)", ReceiverObj(objId), InVariant(vVar));
RootedValue val(cx);
if (!fromVariant(cx, vVar, &val))
return fail(jsapi, rs);
if (!JS_HasInstance(cx, obj, val, bp))
return fail(jsapi, rs);
return ok(rs);
}
bool
WrapperAnswer::RecvGetBuiltinClass(const ObjectId& objId, ReturnStatus* rs,
uint32_t* classValue)
{
MaybeForceDebugGC();
*classValue = uint32_t(js::ESClass::Other);
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.getBuiltinClass()", ReceiverObj(objId));
js::ESClass cls;
if (!js::GetBuiltinClass(cx, obj, &cls))
return fail(jsapi, rs);
*classValue = uint32_t(cls);
return ok(rs);
}
bool
WrapperAnswer::RecvIsArray(const ObjectId& objId, ReturnStatus* rs,
uint32_t* ans)
{
MaybeForceDebugGC();
*ans = uint32_t(IsArrayAnswer::NotArray);
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(jsapi, rs);
LOG("%s.isArray()", ReceiverObj(objId));
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)
{
MaybeForceDebugGC();
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)
{
MaybeForceDebugGC();
*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 deadCPOW(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)
{
MaybeForceDebugGC();
*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 deadCPOW(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)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(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)
{
MaybeForceDebugGC();
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(scopeForTargetObjects())))
return false;
JSContext* cx = jsapi.cx();
RootedObject obj(cx, findObjectById(cx, objId));
if (!obj)
return deadCPOW(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)
{
MaybeForceDebugGC();
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 deadCPOW(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)
{
MaybeForceDebugGC();
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 deadCPOW(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_.findPreserveColor(objId);
if (obj) {
objectIdMap(objId.hasXrayWaiver()).remove(obj);
objects_.remove(objId);
}
return true;
}
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