void
WrapperPromiseCallback::Call(JS::Handle<JS::Value> aValue)
{
// AutoCxPusher and co. interact with xpconnect, which crashes on
// workers. On workers we'll get the right context from
// GetDefaultJSContextForThread(), and since there is only one context, we
// don't need to push or pop it from the stack.
JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
Maybe<AutoCxPusher> pusher;
if (NS_IsMainThread()) {
pusher.construct(cx);
}
Maybe<JSAutoCompartment> ac;
EnterCompartment(ac, cx, aValue);
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
JS::Rooted<JS::Value> value(cx,
mCallback->Call(aValue, rv, CallbackObject::eRethrowExceptions));
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
JS::Rooted<JS::Value> value(cx);
rv.StealJSException(cx, &value);
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextPromise->RejectInternal(cx, value, Promise::SyncTask);
return;
}
// If the return value is the same as the promise itself, throw TypeError.
if (value.isObject()) {
JS::Rooted<JSObject*> valueObj(cx, &value.toObject());
Promise* returnedPromise;
nsresult r = UNWRAP_OBJECT(Promise, valueObj, returnedPromise);
if (NS_SUCCEEDED(r) && returnedPromise == mNextPromise) {
const char* fileName = nullptr;
uint32_t lineNumber = 0;
// Try to get some information about the callback to report a sane error,
// but don't try too hard (only deals with scripted functions).
JS::Rooted<JSObject*> unwrapped(cx,
js::CheckedUnwrap(mCallback->Callback()));
if (unwrapped) {
JSAutoCompartment ac(cx, unwrapped);
if (JS_ObjectIsFunction(cx, unwrapped)) {
JS::Rooted<JS::Value> asValue(cx, JS::ObjectValue(*unwrapped));
JS::Rooted<JSFunction*> func(cx, JS_ValueToFunction(cx, asValue));
MOZ_ASSERT(func);
JSScript* script = JS_GetFunctionScript(cx, func);
if (script) {
fileName = JS_GetScriptFilename(cx, script);
lineNumber = JS_GetScriptBaseLineNumber(cx, script);
}
}
}
// We're back in aValue's compartment here.
JS::Rooted<JSString*> stack(cx, JS_GetEmptyString(JS_GetRuntime(cx)));
JS::Rooted<JSString*> fn(cx, JS_NewStringCopyZ(cx, fileName));
if (!fn) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
JS::Rooted<JSString*> message(cx,
JS_NewStringCopyZ(cx,
"then() cannot return same Promise that it resolves."));
if (!message) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
JS::Rooted<JS::Value> typeError(cx);
if (!JS::CreateTypeError(cx, stack, fn, lineNumber, 0,
nullptr, message, &typeError)) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
mNextPromise->RejectInternal(cx, typeError, Promise::SyncTask);
return;
}
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
Maybe<JSAutoCompartment> ac2;
EnterCompartment(ac2, cx, value);
mNextPromise->ResolveInternal(cx, value, Promise::SyncTask);
}
static JSScript *
GetScript(JSContext *cx, JS::HandleObject funobj)
{
return JS_GetFunctionScript(cx, JS_GetObjectFunction(funobj));
}
nsresult
leakmonJSObjectInfo::Init(leakmonObjectsInReportTable &aObjectsInReport)
{
mIsInitialized = PR_TRUE;
JSContext *cx = leakmonService::GetJSContext();
NS_ENSURE_TRUE(cx, NS_ERROR_UNEXPECTED);
JSAutoRequest ar(cx);
if (!JSVAL_IS_PRIMITIVE(mJSValue)) {
JSObject *obj = JSVAL_TO_OBJECT(mJSValue);
// All of the objects in obj's prototype chain, and all
// objects reachable from JS_NewPropertyIterator should
// (I think?) be in the same compartment.
JSAutoEnterCompartment ac;
if (!ac.enter(cx, obj)) {
return NS_ERROR_FAILURE;
}
JSObject *p;
for (p = obj; p; p = JS_GetPrototype(cx, p)) {
// Stack-scanning protects newly-created objects
// (etor) from GC. (And protecting |etor|
// should in turn protect |id|.)
// JS_NewPropertyIterator has the nice property that it
// avoids JS_Enumerate on native objects (where it can
// execute code) and uses the scope properties, but doesn't
// require this code to use the unstable OBJ_IS_NATIVE API.
JSObject *etor = JS_NewPropertyIterator(cx, p);
if (!etor)
return NS_ERROR_OUT_OF_MEMORY;
jsid id;
while (JS_NextProperty(cx, etor, &id) && !JSID_IS_VOID(id)) {
nsresult rv = AppendProperty(id, cx, aObjectsInReport);
NS_ENSURE_SUCCESS(rv, rv);
}
}
if (JS_ObjectIsFunction(cx, obj)) {
JSFunction *fun = JS_ValueToFunction(cx, mJSValue);
NS_ENSURE_TRUE(fun, NS_ERROR_UNEXPECTED);
JSScript *script = JS_GetFunctionScript(cx, fun);
if (script) { // null for native code
const char *fname = JS_GetScriptFilename(cx, script);
// XXX Do we know the encoding of this file name?
mFileName = NS_ConvertUTF8toUTF16(fname);
mLineStart = JS_GetScriptBaseLineNumber(cx, script);
mLineEnd = mLineStart + JS_GetScriptLineExtent(cx, script) - 1;
}
}
}
ValueToString(cx, mJSValue, mString);
return NS_OK;
}
void
WrapperPromiseCallback::Call(JS::Handle<JS::Value> aValue)
{
ThreadsafeAutoSafeJSContext cx;
JSAutoCompartment ac(cx, mGlobal);
JS::Rooted<JS::Value> value(cx, aValue);
if (!JS_WrapValue(cx, &value)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return;
}
ErrorResult rv;
// If invoking callback threw an exception, run resolver's reject with the
// thrown exception as argument and the synchronous flag set.
JS::Rooted<JS::Value> retValue(cx,
mCallback->Call(value, rv, CallbackObject::eRethrowExceptions));
rv.WouldReportJSException();
if (rv.Failed() && rv.IsJSException()) {
JS::Rooted<JS::Value> value(cx);
rv.StealJSException(cx, &value);
if (!JS_WrapValue(cx, &value)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return;
}
mNextPromise->RejectInternal(cx, value, Promise::SyncTask);
return;
}
// If the return value is the same as the promise itself, throw TypeError.
if (retValue.isObject()) {
JS::Rooted<JSObject*> valueObj(cx, &retValue.toObject());
Promise* returnedPromise;
nsresult r = UNWRAP_OBJECT(Promise, valueObj, returnedPromise);
if (NS_SUCCEEDED(r) && returnedPromise == mNextPromise) {
const char* fileName = nullptr;
uint32_t lineNumber = 0;
// Try to get some information about the callback to report a sane error,
// but don't try too hard (only deals with scripted functions).
JS::Rooted<JSObject*> unwrapped(cx,
js::CheckedUnwrap(mCallback->Callback()));
if (unwrapped) {
JSAutoCompartment ac(cx, unwrapped);
if (JS_ObjectIsFunction(cx, unwrapped)) {
JS::Rooted<JS::Value> asValue(cx, JS::ObjectValue(*unwrapped));
JS::Rooted<JSFunction*> func(cx, JS_ValueToFunction(cx, asValue));
MOZ_ASSERT(func);
JSScript* script = JS_GetFunctionScript(cx, func);
if (script) {
fileName = JS_GetScriptFilename(script);
lineNumber = JS_GetScriptBaseLineNumber(cx, script);
}
}
}
// We're back in aValue's compartment here.
JS::Rooted<JSString*> stack(cx, JS_GetEmptyString(JS_GetRuntime(cx)));
JS::Rooted<JSString*> fn(cx, JS_NewStringCopyZ(cx, fileName));
if (!fn) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
JS::Rooted<JSString*> message(cx,
JS_NewStringCopyZ(cx,
"then() cannot return same Promise that it resolves."));
if (!message) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
JS::Rooted<JS::Value> typeError(cx);
if (!JS::CreateTypeError(cx, stack, fn, lineNumber, 0,
nullptr, message, &typeError)) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(cx);
return;
}
mNextPromise->RejectInternal(cx, typeError, Promise::SyncTask);
return;
}
}
// Otherwise, run resolver's resolve with value and the synchronous flag
// set.
if (!JS_WrapValue(cx, &retValue)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return;
}
mNextPromise->ResolveInternal(cx, retValue, Promise::SyncTask);
}
AutoPushJSContext::AutoPushJSContext(nsISupports* aSecuritySupports,
JSContext *cx)
: mContext(cx), mPushResult(NS_OK)
{
nsCOMPtr<nsIJSContextStack> contextStack =
do_GetService("@mozilla.org/js/xpc/ContextStack;1");
JS_BeginRequest(cx);
JSContext* currentCX;
if(contextStack &&
// Don't push if the current context is already on the stack.
(NS_FAILED(contextStack->Peek(¤tCX)) ||
cx != currentCX) )
{
if (NS_SUCCEEDED(contextStack->Push(cx)))
{
// Leave the reference in mContextStack to
// indicate that we need to pop it in our dtor.
mContextStack.swap(contextStack);
}
}
nsCOMPtr<nsIScriptSecurityManager> secMan(
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &mPushResult));
if (NS_FAILED(mPushResult))
return;
nsCOMPtr<nsIPrincipal> principal;
mPushResult = secMan->GetPrincipalFromContext(cx, getter_AddRefs(principal));
if (NS_FAILED(mPushResult))
{
JS_ReportError(cx, "failed to get a principal");
return;
}
// See if JavaScript is enabled for the current window
PRBool jsEnabled = PR_FALSE;
mPushResult = secMan->CanExecuteScripts(cx, principal, &jsEnabled);
if (!jsEnabled)
mPushResult = NS_ERROR_FAILURE;
memset(&mFrame, 0, sizeof(mFrame));
if (NS_SUCCEEDED(mPushResult))
{
// See if there are any scripts on the stack.
// If not, we need to add a dummy frame with a principal.
PRBool hasScript = PR_FALSE;
JSStackFrame* tempFP = cx->fp;
while (tempFP)
{
if (tempFP->script)
{
hasScript = PR_TRUE;
break;
}
tempFP = tempFP->down;
};
if (!hasScript)
{
JSPrincipals* jsprinc;
principal->GetJSPrincipals(cx, &jsprinc);
JSFunction *fun = JS_CompileFunctionForPrincipals(cx, JS_GetGlobalObject(cx),
jsprinc, "anonymous", 0, nsnull,
"", 0, "", 1);
JSPRINCIPALS_DROP(cx, jsprinc);
if (fun)
{
JSScript *script = JS_GetFunctionScript(cx, fun);
mFrame.fun = fun;
mFrame.script = script;
mFrame.callee = JS_GetFunctionObject(fun);
mFrame.scopeChain = JS_GetParent(cx, mFrame.callee);
mFrame.down = cx->fp;
mRegs.pc = script->code + script->length - 1;
JS_ASSERT(static_cast<JSOp>(*mRegs.pc) == JSOP_STOP);
mRegs.sp = NULL;
mFrame.regs = &mRegs;
cx->fp = &mFrame;
}
else
mPushResult = NS_ERROR_OUT_OF_MEMORY;
}
}
}
static JSScript *
GetScript(JSContext *cx, JS::HandleObject funobj)
{
JS::RootedFunction fun(cx, JS_GetObjectFunction(funobj));
return JS_GetFunctionScript(cx, fun);
}
nsresult
WrapperPromiseCallback::Call(JSContext* aCx,
JS::Handle<JS::Value> aValue)
{
JS::ExposeObjectToActiveJS(mGlobal);
JS::ExposeValueToActiveJS(aValue);
JSAutoCompartment ac(aCx, mGlobal);
JS::Rooted<JS::Value> value(aCx, aValue);
if (!JS_WrapValue(aCx, &value)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return NS_ERROR_FAILURE;
}
ErrorResult rv;
// PromiseReactionTask step 6
JS::Rooted<JS::Value> retValue(aCx);
JSCompartment* compartment;
if (mNextPromise) {
compartment = mNextPromise->Compartment();
} else {
MOZ_ASSERT(mNextPromiseObj);
compartment = js::GetObjectCompartment(mNextPromiseObj);
}
mCallback->Call(value, &retValue, rv, "promise callback",
CallbackObject::eRethrowExceptions,
compartment);
rv.WouldReportJSException();
// PromiseReactionTask step 7
if (rv.Failed()) {
JS::Rooted<JS::Value> value(aCx);
{ // Scope for JSAutoCompartment
// Convert the ErrorResult to a JS exception object that we can reject
// ourselves with. This will be exactly the exception that would get
// thrown from a binding method whose ErrorResult ended up with whatever
// is on "rv" right now. Do this in the promise reflector compartment.
Maybe<JSAutoCompartment> ac;
if (mNextPromise) {
ac.emplace(aCx, mNextPromise->GlobalJSObject());
} else {
ac.emplace(aCx, mNextPromiseObj);
}
DebugOnly<bool> conversionResult = ToJSValue(aCx, rv, &value);
MOZ_ASSERT(conversionResult);
}
if (mNextPromise) {
mNextPromise->RejectInternal(aCx, value);
} else {
JS::Rooted<JS::Value> ignored(aCx);
ErrorResult rejectRv;
mRejectFunc->Call(value, &ignored, rejectRv);
// This reported any JS exceptions; we just have a pointless exception on
// there now.
rejectRv.SuppressException();
}
return NS_OK;
}
// If the return value is the same as the promise itself, throw TypeError.
if (retValue.isObject()) {
JS::Rooted<JSObject*> valueObj(aCx, &retValue.toObject());
valueObj = js::CheckedUnwrap(valueObj);
JS::Rooted<JSObject*> nextPromiseObj(aCx);
if (mNextPromise) {
nextPromiseObj = mNextPromise->GetWrapper();
} else {
MOZ_ASSERT(mNextPromiseObj);
nextPromiseObj = mNextPromiseObj;
}
// XXXbz shouldn't this check be over in ResolveInternal anyway?
if (valueObj == nextPromiseObj) {
const char* fileName = nullptr;
uint32_t lineNumber = 0;
// Try to get some information about the callback to report a sane error,
// but don't try too hard (only deals with scripted functions).
JS::Rooted<JSObject*> unwrapped(aCx,
js::CheckedUnwrap(mCallback->Callback()));
if (unwrapped) {
JSAutoCompartment ac(aCx, unwrapped);
if (JS_ObjectIsFunction(aCx, unwrapped)) {
JS::Rooted<JS::Value> asValue(aCx, JS::ObjectValue(*unwrapped));
JS::Rooted<JSFunction*> func(aCx, JS_ValueToFunction(aCx, asValue));
MOZ_ASSERT(func);
JSScript* script = JS_GetFunctionScript(aCx, func);
if (script) {
fileName = JS_GetScriptFilename(script);
lineNumber = JS_GetScriptBaseLineNumber(aCx, script);
}
}
}
// We're back in aValue's compartment here.
JS::Rooted<JSString*> fn(aCx, JS_NewStringCopyZ(aCx, fileName));
if (!fn) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(aCx);
return NS_ERROR_OUT_OF_MEMORY;
}
JS::Rooted<JSString*> message(aCx,
JS_NewStringCopyZ(aCx,
"then() cannot return same Promise that it resolves."));
if (!message) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(aCx);
return NS_ERROR_OUT_OF_MEMORY;
}
JS::Rooted<JS::Value> typeError(aCx);
if (!JS::CreateError(aCx, JSEXN_TYPEERR, nullptr, fn, lineNumber, 0,
nullptr, message, &typeError)) {
// Out of memory. Promise will stay unresolved.
JS_ClearPendingException(aCx);
return NS_ERROR_OUT_OF_MEMORY;
}
if (mNextPromise) {
mNextPromise->RejectInternal(aCx, typeError);
} else {
JS::Rooted<JS::Value> ignored(aCx);
ErrorResult rejectRv;
mRejectFunc->Call(typeError, &ignored, rejectRv);
// This reported any JS exceptions; we just have a pointless exception
// on there now.
rejectRv.SuppressException();
}
return NS_OK;
}
}
// Otherwise, run resolver's resolve with value.
if (!JS_WrapValue(aCx, &retValue)) {
NS_WARNING("Failed to wrap value into the right compartment.");
return NS_ERROR_FAILURE;
}
if (mNextPromise) {
mNextPromise->ResolveInternal(aCx, retValue);
} else {
JS::Rooted<JS::Value> ignored(aCx);
ErrorResult resolveRv;
mResolveFunc->Call(retValue, &ignored, resolveRv);
// This reported any JS exceptions; we just have a pointless exception
// on there now.
resolveRv.SuppressException();
}
return NS_OK;
}
