gecko/js/ipc/JavaScriptShared.cpp

577 lines
14 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 "JavaScriptShared.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/TabChild.h"
#include "jsfriendapi.h"
#include "xpcprivate.h"
#include "mozilla/Preferences.h"
using namespace js;
using namespace JS;
using namespace mozilla;
using namespace mozilla::jsipc;
IdToObjectMap::IdToObjectMap()
: table_(SystemAllocPolicy())
{
}
bool
IdToObjectMap::init()
{
if (table_.initialized())
return true;
return table_.init(32);
}
void
IdToObjectMap::trace(JSTracer *trc)
{
for (Table::Range r(table_.all()); !r.empty(); r.popFront()) {
DebugOnly<JSObject *> prior = r.front().value().get();
JS_CallObjectTracer(trc, &r.front().value(), "ipc-object");
MOZ_ASSERT(r.front().value() == prior);
}
}
void
IdToObjectMap::sweep()
{
for (Table::Enum e(table_); !e.empty(); e.popFront()) {
DebugOnly<JSObject *> prior = e.front().value().get();
if (JS_IsAboutToBeFinalized(&e.front().value()))
e.removeFront();
}
}
JSObject *
IdToObjectMap::find(ObjectId id)
{
Table::Ptr p = table_.lookup(id);
if (!p)
return nullptr;
return p->value();
}
bool
IdToObjectMap::add(ObjectId id, JSObject *obj)
{
return table_.put(id, obj);
}
void
IdToObjectMap::remove(ObjectId id)
{
table_.remove(id);
}
ObjectToIdMap::ObjectToIdMap()
: table_(nullptr)
{
}
ObjectToIdMap::~ObjectToIdMap()
{
if (table_) {
dom::AddForDeferredFinalization<Table, nsAutoPtr>(table_);
table_ = nullptr;
}
}
bool
ObjectToIdMap::init()
{
if (table_)
return true;
table_ = new Table(SystemAllocPolicy());
return table_ && table_->init(32);
}
void
ObjectToIdMap::sweep()
{
for (Table::Enum e(*table_); !e.empty(); e.popFront()) {
JSObject *obj = e.front().key();
if (JS_IsAboutToBeFinalizedUnbarriered(&obj))
e.removeFront();
else if (obj != e.front().key())
e.rekeyFront(obj);
}
}
ObjectId
ObjectToIdMap::find(JSObject *obj)
{
Table::Ptr p = table_->lookup(obj);
if (!p)
return 0;
return p->value();
}
bool
ObjectToIdMap::add(JSContext *cx, JSObject *obj, ObjectId id)
{
if (!table_->put(obj, id))
return false;
JS_StoreObjectPostBarrierCallback(cx, keyMarkCallback, obj, table_);
return true;
}
/*
* This function is called during minor GCs for each key in the HashMap that has
* been moved.
*/
/* static */ void
ObjectToIdMap::keyMarkCallback(JSTracer *trc, JSObject *key, void *data)
{
Table *table = static_cast<Table*>(data);
JSObject *prior = key;
JS_CallUnbarrieredObjectTracer(trc, &key, "ObjectIdCache::table_ key");
table->rekeyIfMoved(prior, key);
}
void
ObjectToIdMap::remove(JSObject *obj)
{
table_->remove(obj);
}
bool JavaScriptShared::sLoggingInitialized;
bool JavaScriptShared::sLoggingEnabled;
bool JavaScriptShared::sStackLoggingEnabled;
JavaScriptShared::JavaScriptShared(JSRuntime *rt)
: rt_(rt),
refcount_(1),
lastId_(0)
{
if (!sLoggingInitialized) {
sLoggingInitialized = true;
if (PR_GetEnv("MOZ_CPOW_LOG")) {
sLoggingEnabled = true;
sStackLoggingEnabled = true;
} else {
Preferences::AddBoolVarCache(&sLoggingEnabled,
"dom.ipc.cpows.log.enabled", false);
Preferences::AddBoolVarCache(&sStackLoggingEnabled,
"dom.ipc.cpows.log.stack", false);
}
}
}
bool
JavaScriptShared::init()
{
if (!objects_.init())
return false;
if (!cpows_.init())
return false;
if (!objectIds_.init())
return false;
return true;
}
void
JavaScriptShared::decref()
{
refcount_--;
if (!refcount_)
delete this;
}
void
JavaScriptShared::incref()
{
refcount_++;
}
bool
JavaScriptShared::convertIdToGeckoString(JSContext *cx, JS::HandleId id, nsString *to)
{
RootedValue idval(cx);
if (!JS_IdToValue(cx, id, &idval))
return false;
RootedString str(cx, ToString(cx, idval));
if (!str)
return false;
return AssignJSString(cx, *to, str);
}
bool
JavaScriptShared::convertGeckoStringToId(JSContext *cx, const nsString &from, JS::MutableHandleId to)
{
RootedString str(cx, JS_NewUCStringCopyN(cx, from.BeginReading(), from.Length()));
if (!str)
return false;
return JS_StringToId(cx, str, to);
}
bool
JavaScriptShared::toVariant(JSContext *cx, JS::HandleValue from, JSVariant *to)
{
switch (JS_TypeOfValue(cx, from)) {
case JSTYPE_VOID:
*to = UndefinedVariant();
return true;
case JSTYPE_OBJECT:
case JSTYPE_FUNCTION:
{
RootedObject obj(cx, from.toObjectOrNull());
if (!obj) {
MOZ_ASSERT(from == JSVAL_NULL);
*to = NullVariant();
return true;
}
if (xpc_JSObjectIsID(cx, obj)) {
JSIID iid;
const nsID *id = xpc_JSObjectToID(cx, obj);
ConvertID(*id, &iid);
*to = iid;
return true;
}
ObjectVariant objVar;
if (!toObjectVariant(cx, obj, &objVar))
return false;
*to = objVar;
return true;
}
case JSTYPE_STRING:
{
nsAutoJSString autoStr;
if (!autoStr.init(cx, from))
return false;
*to = autoStr;
return true;
}
case JSTYPE_NUMBER:
if (from.isInt32())
*to = double(from.toInt32());
else
*to = from.toDouble();
return true;
case JSTYPE_BOOLEAN:
*to = from.toBoolean();
return true;
default:
MOZ_ASSERT(false);
return false;
}
}
bool
JavaScriptShared::fromVariant(JSContext *cx, const JSVariant &from, MutableHandleValue to)
{
switch (from.type()) {
case JSVariant::TUndefinedVariant:
to.set(UndefinedValue());
return true;
case JSVariant::TNullVariant:
to.set(NullValue());
return true;
case JSVariant::TObjectVariant:
{
JSObject *obj = fromObjectVariant(cx, from.get_ObjectVariant());
if (!obj)
return false;
to.set(ObjectValue(*obj));
return true;
}
case JSVariant::Tdouble:
to.set(JS_NumberValue(from.get_double()));
return true;
case JSVariant::Tbool:
to.set(BOOLEAN_TO_JSVAL(from.get_bool()));
return true;
case JSVariant::TnsString:
{
const nsString &old = from.get_nsString();
JSString *str = JS_NewUCStringCopyN(cx, old.BeginReading(), old.Length());
if (!str)
return false;
to.set(StringValue(str));
return true;
}
case JSVariant::TJSIID:
{
nsID iid;
const JSIID &id = from.get_JSIID();
ConvertID(id, &iid);
JSCompartment *compartment = GetContextCompartment(cx);
RootedObject global(cx, JS_GetGlobalForCompartmentOrNull(cx, compartment));
JSObject *obj = xpc_NewIDObject(cx, global, iid);
if (!obj)
return false;
to.set(ObjectValue(*obj));
return true;
}
default:
return false;
}
}
/* static */ void
JavaScriptShared::ConvertID(const nsID &from, JSIID *to)
{
to->m0() = from.m0;
to->m1() = from.m1;
to->m2() = from.m2;
to->m3_0() = from.m3[0];
to->m3_1() = from.m3[1];
to->m3_2() = from.m3[2];
to->m3_3() = from.m3[3];
to->m3_4() = from.m3[4];
to->m3_5() = from.m3[5];
to->m3_6() = from.m3[6];
to->m3_7() = from.m3[7];
}
/* static */ void
JavaScriptShared::ConvertID(const JSIID &from, nsID *to)
{
to->m0 = from.m0();
to->m1 = from.m1();
to->m2 = from.m2();
to->m3[0] = from.m3_0();
to->m3[1] = from.m3_1();
to->m3[2] = from.m3_2();
to->m3[3] = from.m3_3();
to->m3[4] = from.m3_4();
to->m3[5] = from.m3_5();
to->m3[6] = from.m3_6();
to->m3[7] = from.m3_7();
}
JSObject *
JavaScriptShared::findObjectById(JSContext *cx, uint32_t objId)
{
RootedObject obj(cx, findObjectById(objId));
if (!obj) {
JS_ReportError(cx, "operation not possible on dead CPOW");
return nullptr;
}
// Each process has a dedicated compartment for CPOW targets. All CPOWs
// from the other process point to objects in this scope. From there, they
// can access objects in other compartments using cross-compartment
// wrappers.
JSAutoCompartment ac(cx, scopeForTargetObjects());
if (!JS_WrapObject(cx, &obj))
return nullptr;
return obj;
}
static const uint64_t DefaultPropertyOp = 1;
static const uint64_t UnknownPropertyOp = 2;
bool
JavaScriptShared::fromDescriptor(JSContext *cx, Handle<JSPropertyDescriptor> desc,
PPropertyDescriptor *out)
{
out->attrs() = desc.attributes();
if (!toVariant(cx, desc.value(), &out->value()))
return false;
JS_ASSERT(desc.object());
if (!toObjectVariant(cx, desc.object(), &out->obj()))
return false;
if (!desc.getter()) {
out->getter() = 0;
} else if (desc.hasGetterObject()) {
JSObject *getter = desc.getterObject();
ObjectVariant objVar;
if (!toObjectVariant(cx, getter, &objVar))
return false;
out->getter() = objVar;
} else {
if (desc.getter() == JS_PropertyStub)
out->getter() = DefaultPropertyOp;
else
out->getter() = UnknownPropertyOp;
}
if (!desc.setter()) {
out->setter() = 0;
} else if (desc.hasSetterObject()) {
JSObject *setter = desc.setterObject();
ObjectVariant objVar;
if (!toObjectVariant(cx, setter, &objVar))
return false;
out->setter() = objVar;
} else {
if (desc.setter() == JS_StrictPropertyStub)
out->setter() = DefaultPropertyOp;
else
out->setter() = UnknownPropertyOp;
}
return true;
}
bool
UnknownPropertyStub(JSContext *cx, HandleObject obj, HandleId id, MutableHandleValue vp)
{
JS_ReportError(cx, "getter could not be wrapped via CPOWs");
return false;
}
bool
UnknownStrictPropertyStub(JSContext *cx, HandleObject obj, HandleId id, bool strict, MutableHandleValue vp)
{
JS_ReportError(cx, "setter could not be wrapped via CPOWs");
return false;
}
bool
JavaScriptShared::toDescriptor(JSContext *cx, const PPropertyDescriptor &in,
MutableHandle<JSPropertyDescriptor> out)
{
out.setAttributes(in.attrs());
if (!fromVariant(cx, in.value(), out.value()))
return false;
Rooted<JSObject*> obj(cx);
obj = fromObjectVariant(cx, in.obj());
if (!obj)
return false;
out.object().set(obj);
if (in.getter().type() == GetterSetter::Tuint64_t && !in.getter().get_uint64_t()) {
out.setGetter(nullptr);
} else if (in.attrs() & JSPROP_GETTER) {
Rooted<JSObject*> getter(cx);
getter = fromObjectVariant(cx, in.getter().get_ObjectVariant());
if (!getter)
return false;
out.setGetter(JS_DATA_TO_FUNC_PTR(JSPropertyOp, getter.get()));
} else {
if (in.getter().get_uint64_t() == DefaultPropertyOp)
out.setGetter(JS_PropertyStub);
else
out.setGetter(UnknownPropertyStub);
}
if (in.setter().type() == GetterSetter::Tuint64_t && !in.setter().get_uint64_t()) {
out.setSetter(nullptr);
} else if (in.attrs() & JSPROP_SETTER) {
Rooted<JSObject*> setter(cx);
setter = fromObjectVariant(cx, in.setter().get_ObjectVariant());
if (!setter)
return false;
out.setSetter(JS_DATA_TO_FUNC_PTR(JSStrictPropertyOp, setter.get()));
} else {
if (in.setter().get_uint64_t() == DefaultPropertyOp)
out.setSetter(JS_StrictPropertyStub);
else
out.setSetter(UnknownStrictPropertyStub);
}
return true;
}
bool
CpowIdHolder::ToObject(JSContext *cx, JS::MutableHandleObject objp)
{
return js_->Unwrap(cx, cpows_, objp);
}
bool
JavaScriptShared::Unwrap(JSContext *cx, const InfallibleTArray<CpowEntry> &aCpows,
JS::MutableHandleObject objp)
{
objp.set(nullptr);
if (!aCpows.Length())
return true;
RootedObject obj(cx, JS_NewObject(cx, nullptr, JS::NullPtr(), JS::NullPtr()));
if (!obj)
return false;
RootedValue v(cx);
RootedString str(cx);
for (size_t i = 0; i < aCpows.Length(); i++) {
const nsString &name = aCpows[i].name();
if (!fromVariant(cx, aCpows[i].value(), &v))
return false;
if (!JS_DefineUCProperty(cx,
obj,
name.BeginReading(),
name.Length(),
v,
JSPROP_ENUMERATE))
{
return false;
}
}
objp.set(obj);
return true;
}
bool
JavaScriptShared::Wrap(JSContext *cx, HandleObject aObj, InfallibleTArray<CpowEntry> *outCpows)
{
if (!aObj)
return true;
AutoIdArray ids(cx, JS_Enumerate(cx, aObj));
if (!ids)
return false;
RootedId id(cx);
RootedValue v(cx);
for (size_t i = 0; i < ids.length(); i++) {
id = ids[i];
nsString str;
if (!convertIdToGeckoString(cx, id, &str))
return false;
if (!JS_GetPropertyById(cx, aObj, id, &v))
return false;
JSVariant var;
if (!toVariant(cx, v, &var))
return false;
outCpows->AppendElement(CpowEntry(str, var));
}
return true;
}
void JavaScriptShared::fixupAfterMovingGC()
{
objects_.sweep();
cpows_.sweep();
objectIds_.sweep();
}