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Bug 996785 - Move CPOW wrapper answering code (r=mrbkap)

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This commit is contained in:
Bill McCloskey 2014-05-16 16:40:36 -07:00
parent 4ea552c328
commit 88f199c672
10 changed files with 748 additions and 596 deletions
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2
dom/ipc/ContentParent.cpp
View File

@ -3349,7 +3349,7 @@ ContentParent::DoSendAsyncMessage(JSContext* aCx,
return false;
}
InfallibleTArray<CpowEntry> cpows;
if (!GetCPOWManager()->Wrap(aCx, aCpows, &cpows)) {
if (aCpows && !GetCPOWManager()->Wrap(aCx, aCpows, &cpows)) {
return false;
}
return SendAsyncMessage(nsString(aMessage), data, cpows, aPrincipal);

84
js/ipc/JavaScriptBase.h
View File

@ -8,6 +8,7 @@
#ifndef mozilla_jsipc_JavaScriptBase_h__
#define mozilla_jsipc_JavaScriptBase_h__
#include "WrapperAnswer.h"
#include "WrapperOwner.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/jsipc/PJavaScript.h"
@ -16,11 +17,90 @@ namespace mozilla {
namespace jsipc {
template<class Base>
class JavaScriptBase : public WrapperOwner, public Base
class JavaScriptBase : public WrapperOwner, public WrapperAnswer, public Base
{
typedef WrapperOwner Shared;
typedef WrapperAnswer Answer;
public:
virtual void ActorDestroy(WrapperOwner::ActorDestroyReason why) {
WrapperOwner::ActorDestroy(why);
}
/*** IPC handlers ***/
bool AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs) {
return Answer::AnswerPreventExtensions(objId, rs);
}
bool AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs,
PPropertyDescriptor *out) {
return Answer::AnswerGetPropertyDescriptor(objId, id, rs, out);
}
bool AnswerGetOwnPropertyDescriptor(const ObjectId &objId,
const nsString &id,
ReturnStatus *rs,
PPropertyDescriptor *out) {
return Answer::AnswerGetOwnPropertyDescriptor(objId, id, rs, out);
}
bool AnswerDefineProperty(const ObjectId &objId, const nsString &id,
const PPropertyDescriptor &flags,
ReturnStatus *rs) {
return Answer::AnswerDefineProperty(objId, id, flags, rs);
}
bool AnswerDelete(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *success) {
return Answer::AnswerDelete(objId, id, rs, success);
}
bool AnswerHas(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *bp) {
return Answer::AnswerHas(objId, id, rs, bp);
}
bool AnswerHasOwn(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *bp) {
return Answer::AnswerHasOwn(objId, id, rs, bp);
}
bool AnswerGet(const ObjectId &objId, const ObjectId &receiverId,
const nsString &id,
ReturnStatus *rs, JSVariant *result) {
return Answer::AnswerGet(objId, receiverId, id, rs, result);
}
bool AnswerSet(const ObjectId &objId, const ObjectId &receiverId,
const nsString &id, const bool &strict,
const JSVariant &value, ReturnStatus *rs, JSVariant *result) {
return Answer::AnswerSet(objId, receiverId, id, strict, value, rs, result);
}
bool AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs,
bool *result) {
return Answer::AnswerIsExtensible(objId, rs, result);
}
bool AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv,
ReturnStatus *rs, JSVariant *result,
nsTArray<JSParam> *outparams) {
return Answer::AnswerCall(objId, argv, rs, result, outparams);
}
bool AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
bool *result) {
return Answer::AnswerObjectClassIs(objId, classValue, result);
}
bool AnswerClassName(const ObjectId &objId, nsString *result) {
return Answer::AnswerClassName(objId, result);
}
bool AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
ReturnStatus *rs, nsTArray<nsString> *names) {
return Answer::AnswerGetPropertyNames(objId, flags, rs, names);
}
bool AnswerInstanceOf(const ObjectId &objId, const JSIID &iid,
ReturnStatus *rs, bool *instanceof) {
return Answer::AnswerInstanceOf(objId, iid, rs, instanceof);
}
bool AnswerDOMInstanceOf(const ObjectId &objId, const int &prototypeID, const int &depth,
ReturnStatus *rs, bool *instanceof) {
return Answer::AnswerDOMInstanceOf(objId, prototypeID, depth, rs, instanceof);
}
/*** Dummy call handlers ***/
bool CallPreventExtensions(const ObjectId &objId, ReturnStatus *rs) {

551
js/ipc/JavaScriptChild.cpp
View File

@ -47,8 +47,11 @@ JavaScriptChild::trace(JSTracer *trc)
bool
JavaScriptChild::init()
{
if (!JavaScriptShared::init())
if (!WrapperOwner::init())
return false;
if (!WrapperAnswer::init())
return false;
if (!ids_.init())
return false;
@ -108,549 +111,3 @@ JavaScriptChild::fromId(JSContext *cx, ObjectId id)
return obj;
}
bool
JavaScriptChild::fail(JSContext *cx, ReturnStatus *rs)
{
// By default, we set |undefined| unless we can get a more meaningful
// exception.
*rs = ReturnStatus(ReturnException(JSVariant(void_t())));
// 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.
RootedValue exn(cx);
if (!JS_GetPendingException(cx, &exn))
return true;
// If we don't clear the pending exception, JS will try to wrap it as it
// leaves the current compartment. Since there is no previous compartment,
// that would crash.
JS_ClearPendingException(cx);
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
JavaScriptChild::ok(ReturnStatus *rs)
{
*rs = ReturnStatus(ReturnSuccess());
return true;
}
bool
JavaScriptChild::AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
if (!JS_PreventExtensions(cx, obj))
return fail(cx, rs);
return ok(rs);
}
static void
EmptyDesc(PPropertyDescriptor *desc)
{
desc->objId() = 0;
desc->attrs() = 0;
desc->value() = void_t();
desc->getter() = 0;
desc->setter() = 0;
}
bool
JavaScriptChild::AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, PPropertyDescriptor *out)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
EmptyDesc(out);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
return fail(cx, rs);
if (!desc.object())
return ok(rs);
if (!fromDescriptor(cx, desc, out))
return fail(cx, rs);
return ok(rs);
}
bool
JavaScriptChild::AnswerGetOwnPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, PPropertyDescriptor *out)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
EmptyDesc(out);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
return fail(cx, rs);
if (desc.object() != obj)
return ok(rs);
if (!fromDescriptor(cx, desc, out))
return fail(cx, rs);
return ok(rs);
}
bool
JavaScriptChild::AnswerDefineProperty(const ObjectId &objId, const nsString &id,
const PPropertyDescriptor &descriptor, ReturnStatus *rs)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!toDescriptor(cx, descriptor, &desc))
return false;
if (!js::CheckDefineProperty(cx, obj, internedId, desc.value(), desc.attributes(),
desc.getter(), desc.setter()))
{
return fail(cx, rs);
}
if (!JS_DefinePropertyById(cx, obj, internedId, desc.value(), desc.attributes(),
desc.getter(), desc.setter()))
{
return fail(cx, rs);
}
return ok(rs);
}
bool
JavaScriptChild::AnswerDelete(const ObjectId &objId, const nsString &id, ReturnStatus *rs,
bool *success)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*success = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
if (!JS_DeletePropertyById2(cx, obj, internedId, success))
return fail(cx, rs);
return ok(rs);
}
bool
JavaScriptChild::AnswerHas(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*bp = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
bool found;
if (!JS_HasPropertyById(cx, obj, internedId, &found))
return fail(cx, rs);
*bp = !!found;
return ok(rs);
}
bool
JavaScriptChild::AnswerHasOwn(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*bp = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
return fail(cx, rs);
*bp = (desc.object() == obj);
return ok(rs);
}
bool
JavaScriptChild::AnswerGet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
ReturnStatus *rs, JSVariant *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
// The outparam will be written to the buffer, so it must be set even if
// the parent won't read it.
*result = void_t();
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
RootedObject receiver(cx, findObjectById(receiverId));
if (!receiver)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
JS::RootedValue val(cx);
if (!JS_ForwardGetPropertyTo(cx, obj, internedId, receiver, &val))
return fail(cx, rs);
if (!toVariant(cx, val, result))
return fail(cx, rs);
return ok(rs);
}
bool
JavaScriptChild::AnswerSet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
const bool &strict, const JSVariant &value, ReturnStatus *rs,
JSVariant *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
// The outparam will be written to the buffer, so it must be set even if
// the parent won't read it.
*result = void_t();
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
RootedObject receiver(cx, findObjectById(receiverId));
if (!receiver)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
MOZ_ASSERT(obj == receiver);
RootedValue val(cx);
if (!fromVariant(cx, value, &val))
return fail(cx, rs);
if (!JS_SetPropertyById(cx, obj, internedId, val))
return fail(cx, rs);
if (!toVariant(cx, val, result))
return fail(cx, rs);
return ok(rs);
}
bool
JavaScriptChild::AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs, bool *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*result = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
bool extensible;
if (!JS_IsExtensible(cx, obj, &extensible))
return fail(cx, rs);
*result = !!extensible;
return ok(rs);
}
bool
JavaScriptChild::AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv, ReturnStatus *rs,
JSVariant *result, nsTArray<JSParam> *outparams)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
// The outparam will be written to the buffer, so it must be set even if
// the parent won't read it.
*result = void_t();
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
MOZ_ASSERT(argv.Length() >= 2);
RootedValue objv(cx);
if (!fromVariant(cx, argv[0], &objv))
return fail(cx, rs);
JSAutoCompartment comp(cx, &objv.toObject());
*result = JSVariant(void_t());
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.
JSCompartment *compartment = js::GetContextCompartment(cx);
RootedObject global(cx, JS_GetGlobalForCompartmentOrNull(cx, compartment));
RootedObject obj(cx, xpc::NewOutObject(cx, global));
if (!obj)
return fail(cx, rs);
if (!outobjects.append(ObjectValue(*obj)))
return fail(cx, rs);
if (!vals.append(ObjectValue(*obj)))
return fail(cx, rs);
} else {
RootedValue v(cx);
if (!fromVariant(cx, argv[i].get_JSVariant(), &v))
return fail(cx, rs);
if (!vals.append(v))
return fail(cx, rs);
}
}
RootedValue rval(cx);
{
AutoSaveContextOptions asco(cx);
ContextOptionsRef(cx).setDontReportUncaught(true);
HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2);
bool success = JS::Call(cx, vals[1], vals[0], args, &rval);
if (!success)
return fail(cx, rs);
}
if (!toVariant(cx, rval, result))
return fail(cx, 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(cx, rs);
} else {
v = UndefinedValue();
}
if (!vals.append(v))
return fail(cx, 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(cx, rs);
outparams->ReplaceElementAt(i, JSParam(variant));
}
return ok(rs);
}
bool
JavaScriptChild::AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
bool *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
*result = js_ObjectClassIs(cx, obj, (js::ESClassValue)classValue);
return true;
}
bool
JavaScriptChild::AnswerClassName(const ObjectId &objId, nsString *name)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
*name = NS_ConvertASCIItoUTF16(js_ObjectClassName(cx, obj));
return true;
}
bool
JavaScriptChild::AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
ReturnStatus *rs, nsTArray<nsString> *names)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
AutoIdVector props(cx);
if (!js::GetPropertyNames(cx, obj, flags, &props))
return fail(cx, rs);
for (size_t i = 0; i < props.length(); i++) {
nsString name;
if (!convertIdToGeckoString(cx, props[i], &name))
return fail(cx, rs);
names->AppendElement(name);
}
return ok(rs);
}
bool
JavaScriptChild::AnswerInstanceOf(const ObjectId &objId, const JSIID &iid, ReturnStatus *rs,
bool *instanceof)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*instanceof = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
nsID nsiid;
ConvertID(iid, &nsiid);
nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof);
if (rv != NS_OK)
return fail(cx, rs);
return ok(rs);
}
bool
JavaScriptChild::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(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
bool tmp;
if (!mozilla::dom::InterfaceHasInstance(cx, prototypeID, depth, obj, &tmp))
return fail(cx, rs);
*instanceof = tmp;
return ok(rs);
}

47
js/ipc/JavaScriptChild.h
View File

@ -8,15 +8,13 @@
#ifndef mozilla_jsipc_JavaScriptChild_h_
#define mozilla_jsipc_JavaScriptChild_h_
#include "JavaScriptShared.h"
#include "JavaScriptBase.h"
#include "mozilla/jsipc/PJavaScriptChild.h"
namespace mozilla {
namespace jsipc {
class JavaScriptChild
: public PJavaScriptChild,
public JavaScriptShared
class JavaScriptChild : public JavaScriptBase<PJavaScriptChild>
{
public:
JavaScriptChild(JSRuntime *rt);
@ -27,46 +25,7 @@ class JavaScriptChild
bool RecvDropObject(const ObjectId &objId) MOZ_OVERRIDE;
bool AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs) MOZ_OVERRIDE;
bool AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs,
PPropertyDescriptor *out) MOZ_OVERRIDE;
bool AnswerGetOwnPropertyDescriptor(const ObjectId &objId,
const nsString &id,
ReturnStatus *rs,
PPropertyDescriptor *out) MOZ_OVERRIDE;
bool AnswerDefineProperty(const ObjectId &objId, const nsString &id,
const PPropertyDescriptor &flags,
ReturnStatus *rs) MOZ_OVERRIDE;
bool AnswerDelete(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *success) MOZ_OVERRIDE;
bool AnswerHas(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *bp) MOZ_OVERRIDE;
bool AnswerHasOwn(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *bp) MOZ_OVERRIDE;
bool AnswerGet(const ObjectId &objId, const ObjectId &receiverId,
const nsString &id,
ReturnStatus *rs, JSVariant *result) MOZ_OVERRIDE;
bool AnswerSet(const ObjectId &objId, const ObjectId &receiverId,
const nsString &id, const bool &strict,
const JSVariant &value, ReturnStatus *rs, JSVariant *result) MOZ_OVERRIDE;
bool AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs,
bool *result) MOZ_OVERRIDE;
bool AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv,
ReturnStatus *rs, JSVariant *result,
nsTArray<JSParam> *outparams) MOZ_OVERRIDE;
bool AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
bool *result) MOZ_OVERRIDE;
bool AnswerClassName(const ObjectId &objId, nsString *result) MOZ_OVERRIDE;
bool AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
ReturnStatus *rs, nsTArray<nsString> *names) MOZ_OVERRIDE;
bool AnswerInstanceOf(const ObjectId &objId, const JSIID &iid,
ReturnStatus *rs, bool *instanceof) MOZ_OVERRIDE;
bool AnswerDOMInstanceOf(const ObjectId &objId, const int &prototypeID, const int &depth,
ReturnStatus *rs, bool *instanceof) MOZ_OVERRIDE;
virtual void drop(JSObject *obj) { MOZ_CRASH(); }
private:
JSObject *fromId(JSContext *cx, ObjectId id);

6
js/ipc/JavaScriptShared.cpp
View File

@ -23,6 +23,8 @@ IdToObjectMap::IdToObjectMap()
bool
IdToObjectMap::init()
{
if (table_.initialized())
return true;
return table_.init(32);
}
@ -73,7 +75,9 @@ ObjectToIdMap::~ObjectToIdMap()
bool
ObjectToIdMap::init()
{
MOZ_ASSERT(!table_);
if (table_)
return true;
table_ = new Table(SystemAllocPolicy());
return table_ && table_->init(32);
}

1
js/ipc/PJavaScript.ipdl
View File

@ -22,6 +22,7 @@ child:
// The parent process no longer holds any references to the child object.
async DropObject(uint64_t objId);
both:
// These roughly map to the ProxyHandler hooks that CPOWs need.
rpc PreventExtensions(uint64_t objId) returns (ReturnStatus rs);
rpc GetPropertyDescriptor(uint64_t objId, nsString id) returns (ReturnStatus rs, PPropertyDescriptor result);

578
js/ipc/WrapperAnswer.cpp Normal file
View File

@ -0,0 +1,578 @@
/* -*- 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 "mozilla/dom/ContentChild.h"
#include "mozilla/dom/BindingUtils.h"
#include "nsContentUtils.h"
#include "xpcprivate.h"
#include "jsfriendapi.h"
#include "nsCxPusher.h"
using namespace JS;
using namespace mozilla;
using namespace mozilla::jsipc;
using mozilla::AutoSafeJSContext;
bool
WrapperAnswer::fail(JSContext *cx, 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.
RootedValue exn(cx);
if (!JS_GetPendingException(cx, &exn))
return true;
// If we don't clear the pending exception, JS will try to wrap it as it
// leaves the current compartment. Since there is no previous compartment,
// that would crash.
JS_ClearPendingException(cx);
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::AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
if (!JS_PreventExtensions(cx, obj))
return fail(cx, rs);
return ok(rs);
}
static void
EmptyDesc(PPropertyDescriptor *desc)
{
desc->obj() = LocalObject(0);
desc->attrs() = 0;
desc->value() = UndefinedVariant();
desc->getter() = 0;
desc->setter() = 0;
}
bool
WrapperAnswer::AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, PPropertyDescriptor *out)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
EmptyDesc(out);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
return fail(cx, rs);
if (!desc.object())
return ok(rs);
if (!fromDescriptor(cx, desc, out))
return fail(cx, rs);
return ok(rs);
}
bool
WrapperAnswer::AnswerGetOwnPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, PPropertyDescriptor *out)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
EmptyDesc(out);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
return fail(cx, rs);
if (desc.object() != obj)
return ok(rs);
if (!fromDescriptor(cx, desc, out))
return fail(cx, rs);
return ok(rs);
}
bool
WrapperAnswer::AnswerDefineProperty(const ObjectId &objId, const nsString &id,
const PPropertyDescriptor &descriptor, ReturnStatus *rs)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!toDescriptor(cx, descriptor, &desc))
return false;
if (!js::CheckDefineProperty(cx, obj, internedId, desc.value(), desc.attributes(),
desc.getter(), desc.setter()))
{
return fail(cx, rs);
}
if (!JS_DefinePropertyById(cx, obj, internedId, desc.value(), desc.attributes(),
desc.getter(), desc.setter()))
{
return fail(cx, rs);
}
return ok(rs);
}
bool
WrapperAnswer::AnswerDelete(const ObjectId &objId, const nsString &id, ReturnStatus *rs,
bool *success)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*success = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
if (!JS_DeletePropertyById2(cx, obj, internedId, success))
return fail(cx, rs);
return ok(rs);
}
bool
WrapperAnswer::AnswerHas(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*bp = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
bool found;
if (!JS_HasPropertyById(cx, obj, internedId, &found))
return fail(cx, rs);
*bp = !!found;
return ok(rs);
}
bool
WrapperAnswer::AnswerHasOwn(const ObjectId &objId, const nsString &id, ReturnStatus *rs, bool *bp)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*bp = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
Rooted<JSPropertyDescriptor> desc(cx);
if (!JS_GetPropertyDescriptorById(cx, obj, internedId, &desc))
return fail(cx, rs);
*bp = (desc.object() == obj);
return ok(rs);
}
bool
WrapperAnswer::AnswerGet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
ReturnStatus *rs, JSVariant *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(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(objId));
if (!obj)
return false;
RootedObject receiver(cx, findObjectById(receiverId));
if (!receiver)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
JS::RootedValue val(cx);
if (!JS_ForwardGetPropertyTo(cx, obj, internedId, receiver, &val))
return fail(cx, rs);
if (!toVariant(cx, val, result))
return fail(cx, rs);
return ok(rs);
}
bool
WrapperAnswer::AnswerSet(const ObjectId &objId, const ObjectId &receiverId, const nsString &id,
const bool &strict, const JSVariant &value, ReturnStatus *rs,
JSVariant *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(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(objId));
if (!obj)
return false;
RootedObject receiver(cx, findObjectById(receiverId));
if (!receiver)
return false;
JSAutoCompartment comp(cx, obj);
RootedId internedId(cx);
if (!convertGeckoStringToId(cx, id, &internedId))
return fail(cx, rs);
MOZ_ASSERT(obj == receiver);
RootedValue val(cx);
if (!fromVariant(cx, value, &val))
return fail(cx, rs);
if (!JS_SetPropertyById(cx, obj, internedId, val))
return fail(cx, rs);
if (!toVariant(cx, val, result))
return fail(cx, rs);
return ok(rs);
}
bool
WrapperAnswer::AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs, bool *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
*result = false;
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
bool extensible;
if (!JS_IsExtensible(cx, obj, &extensible))
return fail(cx, rs);
*result = !!extensible;
return ok(rs);
}
bool
WrapperAnswer::AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv, ReturnStatus *rs,
JSVariant *result, nsTArray<JSParam> *outparams)
{
AutoSafeJSContext cx;
JSAutoRequest request(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(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
MOZ_ASSERT(argv.Length() >= 2);
RootedValue objv(cx);
if (!fromVariant(cx, argv[0], &objv))
return fail(cx, 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.
JSCompartment *compartment = js::GetContextCompartment(cx);
RootedObject global(cx, JS_GetGlobalForCompartmentOrNull(cx, compartment));
RootedObject obj(cx, xpc::NewOutObject(cx, global));
if (!obj)
return fail(cx, rs);
if (!outobjects.append(ObjectValue(*obj)))
return fail(cx, rs);
if (!vals.append(ObjectValue(*obj)))
return fail(cx, rs);
} else {
RootedValue v(cx);
if (!fromVariant(cx, argv[i].get_JSVariant(), &v))
return fail(cx, rs);
if (!vals.append(v))
return fail(cx, rs);
}
}
RootedValue rval(cx);
{
AutoSaveContextOptions asco(cx);
ContextOptionsRef(cx).setDontReportUncaught(true);
HandleValueArray args = HandleValueArray::subarray(vals, 2, vals.length() - 2);
bool success = JS::Call(cx, vals[1], vals[0], args, &rval);
if (!success)
return fail(cx, rs);
}
if (!toVariant(cx, rval, result))
return fail(cx, 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(cx, rs);
} else {
v = UndefinedValue();
}
if (!vals.append(v))
return fail(cx, 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(cx, rs);
outparams->ReplaceElementAt(i, JSParam(variant));
}
return ok(rs);
}
bool
WrapperAnswer::AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
bool *result)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
*result = js_ObjectClassIs(cx, obj, (js::ESClassValue)classValue);
return true;
}
bool
WrapperAnswer::AnswerClassName(const ObjectId &objId, nsString *name)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
*name = NS_ConvertASCIItoUTF16(js_ObjectClassName(cx, obj));
return true;
}
bool
WrapperAnswer::AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
ReturnStatus *rs, nsTArray<nsString> *names)
{
AutoSafeJSContext cx;
JSAutoRequest request(cx);
RootedObject obj(cx, findObjectById(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
AutoIdVector props(cx);
if (!js::GetPropertyNames(cx, obj, flags, &props))
return fail(cx, rs);
for (size_t i = 0; i < props.length(); i++) {
nsString name;
if (!convertIdToGeckoString(cx, props[i], &name))
return fail(cx, rs);
names->AppendElement(name);
}
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(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
nsID nsiid;
ConvertID(iid, &nsiid);
nsresult rv = xpc::HasInstance(cx, obj, &nsiid, instanceof);
if (rv != NS_OK)
return fail(cx, rs);
return ok(rs);
}
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(objId));
if (!obj)
return false;
JSAutoCompartment comp(cx, obj);
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;
}

72
js/ipc/WrapperAnswer.h Normal file
View File

@ -0,0 +1,72 @@
/* -*- 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/. */
#ifndef mozilla_jsipc_WrapperAnswer_h_
#define mozilla_jsipc_WrapperAnswer_h_
#include "JavaScriptShared.h"
namespace mozilla {
namespace jsipc {
class WrapperAnswer : public virtual JavaScriptShared
{
public:
WrapperAnswer(JSRuntime *rt) : JavaScriptShared(rt) {}
bool AnswerPreventExtensions(const ObjectId &objId, ReturnStatus *rs);
bool AnswerGetPropertyDescriptor(const ObjectId &objId, const nsString &id,
ReturnStatus *rs,
PPropertyDescriptor *out);
bool AnswerGetOwnPropertyDescriptor(const ObjectId &objId,
const nsString &id,
ReturnStatus *rs,
PPropertyDescriptor *out);
bool AnswerDefineProperty(const ObjectId &objId, const nsString &id,
const PPropertyDescriptor &flags,
ReturnStatus *rs);
bool AnswerDelete(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *success);
bool AnswerHas(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *bp);
bool AnswerHasOwn(const ObjectId &objId, const nsString &id,
ReturnStatus *rs, bool *bp);
bool AnswerGet(const ObjectId &objId, const ObjectId &receiverId,
const nsString &id,
ReturnStatus *rs, JSVariant *result);
bool AnswerSet(const ObjectId &objId, const ObjectId &receiverId,
const nsString &id, const bool &strict,
const JSVariant &value, ReturnStatus *rs, JSVariant *result);
bool AnswerIsExtensible(const ObjectId &objId, ReturnStatus *rs,
bool *result);
bool AnswerCall(const ObjectId &objId, const nsTArray<JSParam> &argv,
ReturnStatus *rs, JSVariant *result,
nsTArray<JSParam> *outparams);
bool AnswerObjectClassIs(const ObjectId &objId, const uint32_t &classValue,
bool *result);
bool AnswerClassName(const ObjectId &objId, nsString *result);
bool AnswerGetPropertyNames(const ObjectId &objId, const uint32_t &flags,
ReturnStatus *rs, nsTArray<nsString> *names);
bool AnswerInstanceOf(const ObjectId &objId, const JSIID &iid,
ReturnStatus *rs, bool *instanceof);
bool AnswerDOMInstanceOf(const ObjectId &objId, const int &prototypeID, const int &depth,
ReturnStatus *rs, bool *instanceof);
bool RecvDropObject(const ObjectId &objId);
private:
bool fail(JSContext *cx, ReturnStatus *rs);
bool ok(ReturnStatus *rs);
};
} // mozilla
} // jsipc
#endif

2
js/ipc/WrapperOwner.h
View File

@ -24,7 +24,7 @@ class BaseProxyHandler;
namespace mozilla {
namespace jsipc {
class WrapperOwner : public JavaScriptShared
class WrapperOwner : public virtual JavaScriptShared
{
public:
typedef mozilla::ipc::IProtocolManager<

1
js/ipc/moz.build
View File

@ -8,6 +8,7 @@ UNIFIED_SOURCES += [
'JavaScriptChild.cpp',
'JavaScriptParent.cpp',
'JavaScriptShared.cpp',
'WrapperAnswer.cpp',
'WrapperOwner.cpp',
]