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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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 "xpcprivate.h"
#include "StaticComponents.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/ProfilerLabels.h"
#include "js/Debug.h" // JS::dbg::ShouldAvoidSideEffects
#include "js/PropertyAndElement.h" // JS_DefineProperty, JS_DefinePropertyById
#include "js/String.h" // JS::LinearStringHasLatin1Chars
#include "nsJSUtils.h"
using namespace mozilla;
using namespace JS;
namespace xpc {
static bool Services_NewEnumerate(JSContext* cx, HandleObject obj,
MutableHandleIdVector properties,
bool enumerableOnly);
static bool Services_Resolve(JSContext* cx, HandleObject obj, HandleId id,
bool* resolvedp);
static bool Services_MayResolve(const JSAtomState& names, jsid id,
JSObject* maybeObj);
static const JSClassOps sServices_ClassOps = {
nullptr, // addProperty
nullptr, // delProperty
nullptr, // enumerate
Services_NewEnumerate, // newEnumerate
Services_Resolve, // resolve
Services_MayResolve, // mayResolve
nullptr, // finalize
nullptr, // call
nullptr, // construct
nullptr, // trace
};
static const JSClass sServices_Class = {"JSServices", 0, &sServices_ClassOps};
JSObject* NewJSServices(JSContext* cx) {
return JS_NewObject(cx, &sServices_Class);
}
static bool Services_NewEnumerate(JSContext* cx, HandleObject obj,
MutableHandleIdVector properties,
bool enumerableOnly) {
auto services = xpcom::StaticComponents::GetJSServices();
if (!properties.reserve(services.Length())) {
JS_ReportOutOfMemory(cx);
return false;
}
RootedId id(cx);
RootedString name(cx);
for (const auto& service : services) {
name = JS_AtomizeString(cx, service.Name().get());
if (!name || !JS_StringToId(cx, name, &id)) {
return false;
}
properties.infallibleAppend(id);
}
return true;
}
static JSLinearString* GetNameIfLatin1(jsid id) {
if (id.isString()) {
JSLinearString* name = id.toLinearString();
if (JS::LinearStringHasLatin1Chars(name)) {
return name;
}
}
return nullptr;
}
static bool GetServiceImpl(JSContext* cx, const xpcom::JSServiceEntry& service,
JS::MutableHandleObject aObj, ErrorResult& aRv) {
nsresult rv;
nsCOMPtr<nsISupports> inst = service.Module().GetService(&rv);
if (!inst) {
aRv.Throw(rv);
return false;
}
auto ifaces = service.Interfaces();
if (ifaces.Length() == 0) {
// If we weren't given any interfaces, we're expecting either a WebIDL
// object or a wrapped JS object. In the former case, the object will handle
// its own wrapping, and there's nothing to do. In the latter case, we want
// to unwrap the underlying JS object.
if (nsCOMPtr<nsIXPConnectWrappedJS> wrappedJS = do_QueryInterface(inst)) {
aObj.set(wrappedJS->GetJSObject());
return !!aObj;
}
}
JS::RootedValue val(cx);
const nsIID* iid = ifaces.Length() ? ifaces[0] : nullptr;
xpcObjectHelper helper(inst);
if (!XPCConvert::NativeInterface2JSObject(cx, &val, helper, iid,
/* allowNativeWrapper */ true,
&rv)) {
aRv.Throw(rv);
return false;
}
if (ifaces.Length() > 1) {
auto* wn = XPCWrappedNative::Get(&val.toObject());
for (const nsIID* iid : Span(ifaces).From(1)) {
// Ignore any supplemental interfaces that aren't implemented. Tests do
// weird things with some services, and JS can generally handle the
// interfaces being absent.
Unused << wn->FindTearOff(cx, *iid);
}
}
aObj.set(&val.toObject());
return true;
}
static JSObject* GetService(JSContext* cx, const xpcom::JSServiceEntry& service,
ErrorResult& aRv) {
JS::RootedObject obj(cx);
if (!GetServiceImpl(cx, service, &obj, aRv)) {
return nullptr;
}
return obj;
}
static bool Services_Resolve(JSContext* cx, HandleObject obj, HandleId id,
bool* resolvedp) {
*resolvedp = false;
if (JS::dbg::ShouldAvoidSideEffects(cx)) {
return false;
}
JSLinearString* name = GetNameIfLatin1(id);
if (!name) {
return true;
}
nsAutoJSLinearCString nameStr(name);
if (const auto* service = xpcom::JSServiceEntry::Lookup(nameStr)) {
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING_NONSENSITIVE("Services_Resolve",
OTHER, service->Name());
*resolvedp = true;
ErrorResult rv;
JS::RootedValue val(cx);
val.setObjectOrNull(GetService(cx, *service, rv));
if (rv.MaybeSetPendingException(cx)) {
return false;
}
return JS_DefinePropertyById(cx, obj, id, val, JSPROP_ENUMERATE);
}
return true;
}
static bool Services_MayResolve(const JSAtomState& names, jsid id,
JSObject* maybeObj) {
if (JSLinearString* name = GetNameIfLatin1(id)) {
nsAutoJSLinearCString nameStr(name);
return xpcom::JSServiceEntry::Lookup(nameStr);
}
return false;
}
} // namespace xpc
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