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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
/*
* nsScriptErrorWithStack implementation.
* a main-thread-only, cycle-collected subclass of nsScriptErrorBase
* that can store a SavedFrame stack trace object.
*/
#include "nsScriptError.h"
#include "MainThreadUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/dom/ScriptSettings.h"
#include "js/Wrapper.h"
#include "nsCycleCollectionParticipant.h"
#include "nsGlobalWindowInner.h"
#include "nsJSUtils.h"
using namespace mozilla::dom;
namespace {
static nsCString FormatStackString(JSContext* cx, JSPrincipals* aPrincipals,
JS::Handle<JSObject*> aStack) {
JS::Rooted<JSString*> formattedStack(cx);
if (!JS::BuildStackString(cx, aPrincipals, aStack, &formattedStack)) {
return nsCString();
}
nsAutoJSString stackJSString;
if (!stackJSString.init(cx, formattedStack)) {
return nsCString();
}
return NS_ConvertUTF16toUTF8(stackJSString.get());
}
} // namespace
NS_IMPL_CYCLE_COLLECTION_CLASS(nsScriptErrorWithStack)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsScriptErrorWithStack)
tmp->mException.setUndefined();
tmp->mStack = nullptr;
tmp->mStackGlobal = nullptr;
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsScriptErrorWithStack)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsScriptErrorWithStack)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mException)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mStack)
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mStackGlobal)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsScriptErrorWithStack)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsScriptErrorWithStack)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsScriptErrorWithStack)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIConsoleMessage)
NS_INTERFACE_MAP_ENTRY(nsIScriptError)
NS_INTERFACE_MAP_END
nsScriptErrorWithStack::nsScriptErrorWithStack(
JS::Handle<mozilla::Maybe<JS::Value>> aException,
JS::Handle<JSObject*> aStack, JS::Handle<JSObject*> aStackGlobal)
: mStack(aStack), mStackGlobal(aStackGlobal) {
MOZ_ASSERT(NS_IsMainThread(), "You can't use this class on workers.");
if (aException.isSome()) {
mHasException = true;
mException.set(*aException);
} else {
mHasException = false;
mException.setUndefined();
}
if (mStack) {
MOZ_ASSERT(JS_IsGlobalObject(mStackGlobal));
js::AssertSameCompartment(mStack, mStackGlobal);
} else {
MOZ_ASSERT(!mStackGlobal);
}
mozilla::HoldJSObjects(this);
}
nsScriptErrorWithStack::~nsScriptErrorWithStack() {
mozilla::DropJSObjects(this);
}
NS_IMETHODIMP
nsScriptErrorWithStack::GetHasException(bool* aHasException) {
*aHasException = mHasException;
return NS_OK;
}
NS_IMETHODIMP
nsScriptErrorWithStack::GetException(JS::MutableHandle<JS::Value> aException) {
aException.set(mException);
return NS_OK;
}
NS_IMETHODIMP
nsScriptErrorWithStack::GetStack(JS::MutableHandle<JS::Value> aStack) {
aStack.setObjectOrNull(mStack);
return NS_OK;
}
NS_IMETHODIMP
nsScriptErrorWithStack::GetStackGlobal(
JS::MutableHandle<JS::Value> aStackGlobal) {
aStackGlobal.setObjectOrNull(mStackGlobal);
return NS_OK;
}
NS_IMETHODIMP
nsScriptErrorWithStack::ToString(nsACString& /*UTF8*/ aResult) {
MOZ_ASSERT(NS_IsMainThread());
nsCString message;
nsresult rv = nsScriptErrorBase::ToString(message);
NS_ENSURE_SUCCESS(rv, rv);
if (!mStack) {
aResult.Assign(message);
return NS_OK;
}
AutoJSAPI jsapi;
if (!jsapi.Init(mStackGlobal)) {
return NS_ERROR_FAILURE;
}
JSPrincipals* principals =
JS::GetRealmPrincipals(js::GetNonCCWObjectRealm(mStackGlobal));
JSContext* cx = jsapi.cx();
JS::Rooted<JSObject*> stack(cx, mStack);
nsCString stackString = FormatStackString(cx, principals, stack);
nsCString combined = message + "\n"_ns + stackString;
aResult.Assign(combined);
return NS_OK;
}
static bool IsObjectGlobalDying(JSObject* aObj) {
// CCWs are not associated with a single global
if (js::IsCrossCompartmentWrapper(aObj)) {
return false;
}
nsGlobalWindowInner* win = xpc::WindowGlobalOrNull(aObj);
return win && win->IsDying();
}
already_AddRefed<nsScriptErrorBase> CreateScriptError(
nsGlobalWindowInner* win, JS::Handle<mozilla::Maybe<JS::Value>> aException,
JS::Handle<JSObject*> aStack, JS::Handle<JSObject*> aStackGlobal) {
bool createWithStack = true;
if (aException.isNothing() && !aStack) {
// Neither stack nor exception, do not need nsScriptErrorWithStack.
createWithStack = false;
} else if (win && (win->IsDying() || !win->WindowID())) {
// The window is already dying or we don't have a WindowID,
// this means nsConsoleService::ClearMessagesForWindowID
// would be unable to cleanup this error.
createWithStack = false;
} else if ((aStackGlobal && IsObjectGlobalDying(aStackGlobal)) ||
(aException.isSome() && aException.value().isObject() &&
IsObjectGlobalDying(&aException.value().toObject()))) {
// Prevent leaks by not creating references to already dying globals.
createWithStack = false;
}
if (!createWithStack) {
RefPtr<nsScriptErrorBase> error = new nsScriptError();
return error.forget();
}
RefPtr<nsScriptErrorBase> error =
new nsScriptErrorWithStack(aException, aStack, aStackGlobal);
return error.forget();
}