gecko/js/ipc/JavaScriptParent.cpp

659 lines
17 KiB
C++

/* -*- 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 "JavaScriptParent.h"
#include "mozilla/dom/ContentParent.h"
#include "nsJSUtils.h"
#include "jsfriendapi.h"
#include "jsproxy.h"
#include "HeapAPI.h"
#include "xpcprivate.h"
#include "mozilla/Casting.h"
using namespace js;
using namespace JS;
using namespace mozilla;
using namespace mozilla::jsipc;
JavaScriptParent::JavaScriptParent()
: refcount_(1),
inactive_(false)
{
}
static inline JavaScriptParent *
ParentOf(JSObject *obj)
{
MOZ_ASSERT(JavaScriptParent::IsCPOW(obj));
return reinterpret_cast<JavaScriptParent *>(GetProxyExtra(obj, 0).toPrivate());
}
ObjectId
JavaScriptParent::idOf(JSObject *obj)
{
MOZ_ASSERT(JavaScriptParent::IsCPOW(obj));
Value v = GetProxyExtra(obj, 1);
MOZ_ASSERT(v.isDouble());
ObjectId objId = BitwiseCast<uint64_t>(v.toDouble());
MOZ_ASSERT(findObject(objId) == obj);
MOZ_ASSERT(objId);
return objId;
}
int sCPOWProxyHandler;
class CPOWProxyHandler : public BaseProxyHandler
{
public:
CPOWProxyHandler()
: BaseProxyHandler(&sCPOWProxyHandler) {}
virtual ~CPOWProxyHandler() {}
virtual bool finalizeInBackground(Value priv) MOZ_OVERRIDE {
return false;
}
virtual bool preventExtensions(JSContext *cx, HandleObject proxy) MOZ_OVERRIDE;
virtual bool getPropertyDescriptor(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc, unsigned flags) MOZ_OVERRIDE;
virtual bool getOwnPropertyDescriptor(JSContext *cx, HandleObject proxy,
HandleId id, PropertyDescriptor *desc, unsigned flags) MOZ_OVERRIDE;
virtual bool defineProperty(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc) MOZ_OVERRIDE;
virtual bool getOwnPropertyNames(JSContext *cx, HandleObject proxy,
AutoIdVector &props) MOZ_OVERRIDE;
virtual bool delete_(JSContext *cx, HandleObject proxy, HandleId id, bool *bp) MOZ_OVERRIDE;
virtual bool enumerate(JSContext *cx, HandleObject proxy, AutoIdVector &props) MOZ_OVERRIDE;
virtual bool has(JSContext *cx, HandleObject proxy, HandleId id, bool *bp) MOZ_OVERRIDE;
virtual bool hasOwn(JSContext *cx, HandleObject proxy, HandleId id, bool *bp) MOZ_OVERRIDE;
virtual bool get(JSContext *cx, HandleObject proxy, HandleObject receiver,
HandleId id, MutableHandleValue vp) MOZ_OVERRIDE;
virtual bool set(JSContext *cx, JS::HandleObject proxy, JS::HandleObject receiver,
JS::HandleId id, bool strict, JS::MutableHandleValue vp) MOZ_OVERRIDE;
virtual bool keys(JSContext *cx, HandleObject proxy, AutoIdVector &props) MOZ_OVERRIDE;
virtual bool isExtensible(JSContext *cx, HandleObject proxy, bool *extensible) MOZ_OVERRIDE;
virtual bool call(JSContext *cx, HandleObject proxy, const CallArgs &args) MOZ_OVERRIDE;
virtual bool objectClassIs(HandleObject obj, js::ESClassValue classValue, JSContext *cx) MOZ_OVERRIDE;
virtual const char* className(JSContext *cx, HandleObject proxy) MOZ_OVERRIDE;
virtual void finalize(JSFreeOp *fop, JSObject *proxy) MOZ_OVERRIDE;
static CPOWProxyHandler singleton;
};
CPOWProxyHandler CPOWProxyHandler::singleton;
bool
CPOWProxyHandler::preventExtensions(JSContext *cx, HandleObject proxy)
{
return ParentOf(proxy)->preventExtensions(cx, proxy);
}
bool
JavaScriptParent::preventExtensions(JSContext *cx, HandleObject proxy)
{
ObjectId objId = idOf(proxy);
ReturnStatus status;
if (!CallPreventExtensions(objId, &status))
return ipcfail(cx);
return ok(cx, status);
}
bool
CPOWProxyHandler::getPropertyDescriptor(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc, unsigned flags)
{
return ParentOf(proxy)->getPropertyDescriptor(cx, proxy, id, desc, flags);
}
bool
JavaScriptParent::getPropertyDescriptor(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc, unsigned flags)
{
ObjectId objId = idOf(proxy);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
ReturnStatus status;
PPropertyDescriptor result;
if (!CallGetPropertyDescriptor(objId, idstr, flags, &status, &result))
return ipcfail(cx);
if (!ok(cx, status))
return false;
return toDescriptor(cx, result, desc);
}
bool
CPOWProxyHandler::getOwnPropertyDescriptor(JSContext *cx, HandleObject proxy,
HandleId id, PropertyDescriptor *desc, unsigned flags)
{
return ParentOf(proxy)->getOwnPropertyDescriptor(cx, proxy, id, desc, flags);
}
bool
JavaScriptParent::getOwnPropertyDescriptor(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc, unsigned flags)
{
ObjectId objId = idOf(proxy);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
ReturnStatus status;
PPropertyDescriptor result;
if (!CallGetOwnPropertyDescriptor(objId, idstr, flags, &status, &result))
return ipcfail(cx);
if (!ok(cx, status))
return false;
return toDescriptor(cx, result, desc);
}
bool
CPOWProxyHandler::defineProperty(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc)
{
return ParentOf(proxy)->defineProperty(cx, proxy, id, desc);
}
bool
JavaScriptParent::defineProperty(JSContext *cx, HandleObject proxy, HandleId id,
PropertyDescriptor *desc)
{
ObjectId objId = idOf(proxy);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
PPropertyDescriptor descriptor;
if (!fromDescriptor(cx, *desc, &descriptor))
return false;
ReturnStatus status;
if (!CallDefineProperty(objId, idstr, descriptor, &status))
return ipcfail(cx);
return ok(cx, status);
}
bool
CPOWProxyHandler::getOwnPropertyNames(JSContext *cx, HandleObject proxy, AutoIdVector &props)
{
return ParentOf(proxy)->getOwnPropertyNames(cx, proxy, props);
}
bool
JavaScriptParent::getOwnPropertyNames(JSContext *cx, HandleObject proxy, AutoIdVector &props)
{
return getPropertyNames(cx, proxy, JSITER_OWNONLY | JSITER_HIDDEN, props);
}
bool
CPOWProxyHandler::delete_(JSContext *cx, HandleObject proxy, HandleId id, bool *bp)
{
return ParentOf(proxy)->delete_(cx, proxy, id, bp);
}
bool
JavaScriptParent::delete_(JSContext *cx, HandleObject proxy, HandleId id, bool *bp)
{
ObjectId objId = idOf(proxy);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
ReturnStatus status;
if (!CallDelete(objId, idstr, &status, bp))
return ipcfail(cx);
return ok(cx, status);
}
bool
CPOWProxyHandler::enumerate(JSContext *cx, HandleObject proxy, AutoIdVector &props)
{
return ParentOf(proxy)->enumerate(cx, proxy, props);
}
bool
JavaScriptParent::enumerate(JSContext *cx, HandleObject proxy, AutoIdVector &props)
{
return getPropertyNames(cx, proxy, 0, props);
}
bool
CPOWProxyHandler::has(JSContext *cx, HandleObject proxy, HandleId id, bool *bp)
{
return ParentOf(proxy)->has(cx, proxy, id, bp);
}
bool
JavaScriptParent::has(JSContext *cx, HandleObject proxy, HandleId id, bool *bp)
{
ObjectId objId = idOf(proxy);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
ReturnStatus status;
if (!CallHas(objId, idstr, &status, bp))
return ipcfail(cx);
return ok(cx, status);
}
bool
CPOWProxyHandler::hasOwn(JSContext *cx, HandleObject proxy, HandleId id, bool *bp)
{
return ParentOf(proxy)->hasOwn(cx, proxy, id, bp);
}
bool
JavaScriptParent::hasOwn(JSContext *cx, HandleObject proxy, HandleId id, bool *bp)
{
ObjectId objId = idOf(proxy);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
ReturnStatus status;
if (!CallHasOwn(objId, idstr, &status, bp))
return ipcfail(cx);
return !!ok(cx, status);
}
bool
CPOWProxyHandler::get(JSContext *cx, HandleObject proxy, HandleObject receiver,
HandleId id, MutableHandleValue vp)
{
return ParentOf(proxy)->get(cx, proxy, receiver, id, vp);
}
bool
JavaScriptParent::get(JSContext *cx, HandleObject proxy, HandleObject receiver,
HandleId id, MutableHandleValue vp)
{
ObjectId objId = idOf(proxy);
ObjectId receiverId = idOf(receiver);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
JSVariant val;
ReturnStatus status;
if (!CallGet(objId, receiverId, idstr, &status, &val))
return ipcfail(cx);
if (!ok(cx, status))
return false;
return toValue(cx, val, vp);
}
bool
CPOWProxyHandler::set(JSContext *cx, JS::HandleObject proxy, JS::HandleObject receiver,
JS::HandleId id, bool strict, JS::MutableHandleValue vp)
{
return ParentOf(proxy)->set(cx, proxy, receiver, id, strict, vp);
}
bool
JavaScriptParent::set(JSContext *cx, JS::HandleObject proxy, JS::HandleObject receiver,
JS::HandleId id, bool strict, JS::MutableHandleValue vp)
{
ObjectId objId = idOf(proxy);
ObjectId receiverId = idOf(receiver);
nsString idstr;
if (!convertIdToGeckoString(cx, id, &idstr))
return false;
JSVariant val;
if (!toVariant(cx, vp, &val))
return false;
ReturnStatus status;
JSVariant result;
if (!CallSet(objId, receiverId, idstr, strict, val, &status, &result))
return ipcfail(cx);
if (!ok(cx, status))
return false;
return toValue(cx, result, vp);
}
bool
CPOWProxyHandler::keys(JSContext *cx, HandleObject proxy, AutoIdVector &props)
{
return ParentOf(proxy)->keys(cx, proxy, props);
}
bool
JavaScriptParent::keys(JSContext *cx, HandleObject proxy, AutoIdVector &props)
{
return getPropertyNames(cx, proxy, JSITER_OWNONLY, props);
}
bool
CPOWProxyHandler::isExtensible(JSContext *cx, HandleObject proxy, bool *extensible)
{
return ParentOf(proxy)->isExtensible(cx, proxy, extensible);
}
bool
JavaScriptParent::isExtensible(JSContext *cx, HandleObject proxy, bool *extensible)
{
ObjectId objId = idOf(proxy);
ReturnStatus status;
if (!CallIsExtensible(objId, &status, extensible))
return ipcfail(cx);
return ok(cx, status);
}
bool
CPOWProxyHandler::call(JSContext *cx, HandleObject proxy, const CallArgs &args)
{
return ParentOf(proxy)->call(cx, proxy, args);
}
bool
JavaScriptParent::call(JSContext *cx, HandleObject proxy, const CallArgs &args)
{
ObjectId objId = idOf(proxy);
InfallibleTArray<JSParam> vals;
AutoValueVector outobjects(cx);
RootedValue v(cx);
for (size_t i = 0; i < args.length() + 2; i++) {
v = args.base()[i];
if (v.isObject()) {
JSObject *obj = &v.toObject();
if (xpc::IsOutObject(cx, obj)) {
// Make sure it is not an in-out object.
JSBool found;
if (!JS_HasProperty(cx, obj, "value", &found))
return false;
if (found) {
JS_ReportError(cx, "in-out objects cannot be sent via CPOWs yet");
return false;
}
vals.AppendElement(JSParam(void_t()));
if (!outobjects.append(ObjectValue(*obj)))
return false;
continue;
}
}
JSVariant val;
if (!toVariant(cx, v, &val))
return false;
vals.AppendElement(JSParam(val));
}
JSVariant result;
ReturnStatus status;
InfallibleTArray<JSParam> outparams;
if (!CallCall(objId, vals, &status, &result, &outparams))
return ipcfail(cx);
if (!ok(cx, status))
return false;
if (outparams.Length() != outobjects.length())
return ipcfail(cx);
for (size_t i = 0; i < outparams.Length(); i++) {
// Don't bother doing anything for outparams that weren't set.
if (outparams[i].type() == JSParam::Tvoid_t)
continue;
// Take the value the child process returned, and set it on the XPC
// object.
if (!toValue(cx, outparams[i], &v))
return false;
JSObject *obj = &outobjects[i].toObject();
if (!JS_SetProperty(cx, obj, "value", v))
return false;
}
if (!toValue(cx, result, args.rval()))
return false;
return true;
}
bool
CPOWProxyHandler::objectClassIs(HandleObject proxy, js::ESClassValue classValue, JSContext *cx)
{
return ParentOf(proxy)->objectClassIs(cx, proxy, classValue);
}
bool
JavaScriptParent::objectClassIs(JSContext *cx, HandleObject proxy, js::ESClassValue classValue)
{
ObjectId objId = idOf(proxy);
// This function is assumed infallible, so we just return false if the IPC
// channel fails.
bool result;
if (!CallObjectClassIs(objId, classValue, &result))
return false;
return result;
}
const char *
CPOWProxyHandler::className(JSContext *cx, HandleObject proxy)
{
return ParentOf(proxy)->className(cx, proxy);
}
const char *
JavaScriptParent::className(JSContext *cx, HandleObject proxy)
{
ObjectId objId = idOf(proxy);
nsString name;
if (!CallClassName(objId, &name))
return NULL;
return ToNewCString(name);
}
void
CPOWProxyHandler::finalize(JSFreeOp *fop, JSObject *proxy)
{
ParentOf(proxy)->drop(proxy);
}
void
JavaScriptParent::drop(JSObject *obj)
{
ObjectId objId = idOf(obj);
objects_.remove(objId);
if (!inactive_ && !SendDropObject(objId))
(void)0;
decref();
}
bool
JavaScriptParent::init()
{
if (!JavaScriptShared::init())
return false;
return true;
}
bool
JavaScriptParent::makeId(JSContext *cx, JSObject *obj, ObjectId *idp)
{
if (!IsProxy(obj) || GetProxyHandler(obj) != &CPOWProxyHandler::singleton) {
JS_ReportError(cx, "cannot ipc non-cpow object");
return false;
}
*idp = idOf(obj);
return true;
}
bool
JavaScriptParent::getPropertyNames(JSContext *cx, HandleObject proxy, uint32_t flags, AutoIdVector &props)
{
ObjectId objId = idOf(proxy);
ReturnStatus status;
InfallibleTArray<nsString> names;
if (!CallGetPropertyNames(objId, flags, &status, &names))
return ipcfail(cx);
if (!ok(cx, status))
return false;
for (size_t i = 0; i < names.Length(); i++) {
RootedId name(cx);
if (!convertGeckoStringToId(cx, names[i], &name))
return false;
if (!props.append(name))
return false;
}
return true;
}
JSObject *
JavaScriptParent::unwrap(JSContext *cx, ObjectId objId)
{
if (JSObject *obj = findObject(objId)) {
if (!JS_WrapObject(cx, &obj))
return NULL;
return obj;
}
if (objId > MAX_CPOW_IDS) {
JS_ReportError(cx, "unusable CPOW id");
return NULL;
}
bool callable = !!(objId & OBJECT_IS_CALLABLE);
RootedObject global(cx, JS::CurrentGlobalOrNull(cx));
RootedValue v(cx, UndefinedValue());
JSObject *obj = NewProxyObject(cx,
&CPOWProxyHandler::singleton,
v,
NULL,
global,
callable ? ProxyIsCallable : ProxyNotCallable);
if (!obj)
return NULL;
if (!objects_.add(objId, obj))
return NULL;
// Incref once we know the decref will be called.
incref();
SetProxyExtra(obj, 0, PrivateValue(this));
SetProxyExtra(obj, 1, DoubleValue(BitwiseCast<double>(objId)));
return obj;
}
bool
JavaScriptParent::ipcfail(JSContext *cx)
{
JS_ReportError(cx, "catastrophic IPC failure");
return false;
}
bool
JavaScriptParent::ok(JSContext *cx, const ReturnStatus &status)
{
if (status.ok())
return true;
RootedValue exn(cx);
if (!toValue(cx, status.exn(), &exn))
return false;
JS_SetPendingException(cx, exn);
return false;
}
void
JavaScriptParent::decref()
{
refcount_--;
if (!refcount_)
delete this;
}
void
JavaScriptParent::incref()
{
refcount_++;
}
void
JavaScriptParent::destroyFromContent()
{
inactive_ = true;
decref();
}
/* static */ bool
JavaScriptParent::IsCPOW(JSObject *obj)
{
return IsProxy(obj) && GetProxyHandler(obj) == &CPOWProxyHandler::singleton;
}
/* static */ nsresult
JavaScriptParent::InstanceOf(JSObject *obj, const nsID *id, bool *bp)
{
return ParentOf(obj)->instanceOf(obj, id, bp);
}
nsresult
JavaScriptParent::instanceOf(JSObject *obj, const nsID *id, bool *bp)
{
ObjectId objId = idOf(obj);
JSIID iid;
ConvertID(*id, &iid);
ReturnStatus status;
if (!CallInstanceOf(objId, iid, &status, bp))
return NS_ERROR_UNEXPECTED;
if (!status.ok())
return NS_ERROR_UNEXPECTED;
return NS_OK;
}