зеркало из https://github.com/mozilla/gecko-dev.git
591 строка
16 KiB
C++
591 строка
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/Exceptions.h"
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#include "js/GCAPI.h"
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#include "js/OldDebugAPI.h"
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#include "jsapi.h"
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#include "jsprf.h"
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#include "mozilla/CycleCollectedJSRuntime.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/DOMException.h"
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#include "nsServiceManagerUtils.h"
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#include "nsThreadUtils.h"
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#include "XPCWrapper.h"
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#include "WorkerPrivate.h"
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#include "nsContentUtils.h"
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namespace {
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// We can't use nsContentUtils::IsCallerChrome because it might not exist in
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// xpcshell.
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bool
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IsCallerChrome()
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{
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nsCOMPtr<nsIScriptSecurityManager> secMan;
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secMan = XPCWrapper::GetSecurityManager();
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if (!secMan) {
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return false;
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}
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bool isChrome;
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return NS_SUCCEEDED(secMan->SubjectPrincipalIsSystem(&isChrome)) && isChrome;
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}
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} // anonymous namespace
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namespace mozilla {
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namespace dom {
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bool
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ThrowExceptionObject(JSContext* aCx, nsIException* aException)
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{
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// See if we really have an Exception.
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nsCOMPtr<Exception> exception = do_QueryInterface(aException);
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if (exception) {
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return ThrowExceptionObject(aCx, exception);
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}
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// We only have an nsIException (probably an XPCWrappedJS). Fall back on old
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// wrapping.
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MOZ_ASSERT(NS_IsMainThread());
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JS::Rooted<JSObject*> glob(aCx, JS::CurrentGlobalOrNull(aCx));
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if (!glob) {
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return false;
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}
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JS::Rooted<JS::Value> val(aCx);
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if (!WrapObject(aCx, glob, aException, &NS_GET_IID(nsIException), &val)) {
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return false;
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}
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JS_SetPendingException(aCx, val);
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return true;
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}
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bool
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ThrowExceptionObject(JSContext* aCx, Exception* aException)
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{
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JS::Rooted<JS::Value> thrown(aCx);
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// If we stored the original thrown JS value in the exception
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// (see XPCConvert::ConstructException) and we are in a web context
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// (i.e., not chrome), rethrow the original value. This only applies to JS
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// implemented components so we only need to check for this on the main
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// thread.
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if (NS_IsMainThread() && !IsCallerChrome() &&
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aException->StealJSVal(thrown.address())) {
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if (!JS_WrapValue(aCx, &thrown)) {
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return false;
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}
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JS_SetPendingException(aCx, thrown);
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return true;
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}
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JS::Rooted<JSObject*> glob(aCx, JS::CurrentGlobalOrNull(aCx));
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if (!glob) {
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return false;
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}
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if (!WrapNewBindingObject(aCx, glob, aException, &thrown)) {
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return false;
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}
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JS_SetPendingException(aCx, thrown);
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return true;
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}
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bool
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Throw(JSContext* aCx, nsresult aRv, const char* aMessage)
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{
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if (JS_IsExceptionPending(aCx)) {
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// Don't clobber the existing exception.
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return false;
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}
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CycleCollectedJSRuntime* runtime = CycleCollectedJSRuntime::Get();
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nsCOMPtr<nsIException> existingException = runtime->GetPendingException();
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if (existingException) {
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nsresult nr;
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if (NS_SUCCEEDED(existingException->GetResult(&nr)) &&
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aRv == nr) {
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// Reuse the existing exception.
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// Clear pending exception
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runtime->SetPendingException(nullptr);
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if (!ThrowExceptionObject(aCx, existingException)) {
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// If we weren't able to throw an exception we're
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// most likely out of memory
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JS_ReportOutOfMemory(aCx);
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}
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return false;
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}
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}
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nsRefPtr<Exception> finalException;
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// Do we use DOM exceptions for this error code?
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switch (NS_ERROR_GET_MODULE(aRv)) {
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case NS_ERROR_MODULE_DOM:
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case NS_ERROR_MODULE_SVG:
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case NS_ERROR_MODULE_DOM_XPATH:
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case NS_ERROR_MODULE_DOM_INDEXEDDB:
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case NS_ERROR_MODULE_DOM_FILEHANDLE:
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finalException = DOMException::Create(aRv);
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break;
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default:
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break;
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}
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// If not, use the default.
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if (!finalException) {
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finalException = new Exception(aMessage, aRv, nullptr, nullptr, nullptr);
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}
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MOZ_ASSERT(finalException);
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if (!ThrowExceptionObject(aCx, finalException)) {
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// If we weren't able to throw an exception we're
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// most likely out of memory
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JS_ReportOutOfMemory(aCx);
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}
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return false;
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}
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already_AddRefed<nsIStackFrame>
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GetCurrentJSStack()
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{
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// is there a current context available?
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JSContext* cx = nullptr;
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if (NS_IsMainThread()) {
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// Note, in xpcshell nsContentUtils is never initialized, but we still need
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// to report exceptions.
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if (nsContentUtils::XPConnect()) {
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cx = nsContentUtils::XPConnect()->GetCurrentJSContext();
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} else {
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nsCOMPtr<nsIXPConnect> xpc = do_GetService(nsIXPConnect::GetCID());
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cx = xpc->GetCurrentJSContext();
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}
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} else {
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cx = workers::GetCurrentThreadJSContext();
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}
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if (!cx) {
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return nullptr;
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}
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nsCOMPtr<nsIStackFrame> stack = exceptions::CreateStack(cx);
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if (!stack) {
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return nullptr;
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}
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// peel off native frames...
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uint32_t language;
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nsCOMPtr<nsIStackFrame> caller;
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while (stack &&
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NS_SUCCEEDED(stack->GetLanguage(&language)) &&
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language != nsIProgrammingLanguage::JAVASCRIPT &&
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NS_SUCCEEDED(stack->GetCaller(getter_AddRefs(caller))) &&
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caller) {
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stack = caller;
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}
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return stack.forget();
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}
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namespace exceptions {
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class StackDescriptionOwner {
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public:
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StackDescriptionOwner(JS::StackDescription* aDescription)
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: mDescription(aDescription)
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{
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mozilla::HoldJSObjects(this);
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}
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~StackDescriptionOwner()
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{
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// Make sure to set mDescription to null before calling DropJSObjects, since
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// in debug builds DropJSObjects try to trace us and we don't want to trace
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// a dead StackDescription.
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if (mDescription) {
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JS::FreeStackDescription(nullptr, mDescription);
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mDescription = nullptr;
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}
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mozilla::DropJSObjects(this);
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}
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(StackDescriptionOwner)
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(StackDescriptionOwner)
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JS::FrameDescription& FrameAt(size_t aIndex)
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{
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MOZ_ASSERT(aIndex < mDescription->nframes);
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return mDescription->frames[aIndex];
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}
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unsigned NumFrames()
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{
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return mDescription->nframes;
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}
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private:
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JS::StackDescription* mDescription;
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};
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NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(StackDescriptionOwner, AddRef)
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NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(StackDescriptionOwner, Release)
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NS_IMPL_CYCLE_COLLECTION_CLASS(StackDescriptionOwner)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(StackDescriptionOwner)
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if (tmp->mDescription) {
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JS::FreeStackDescription(nullptr, tmp->mDescription);
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tmp->mDescription = nullptr;
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(StackDescriptionOwner)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(StackDescriptionOwner)
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JS::StackDescription* desc = tmp->mDescription;
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if (tmp->mDescription) {
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for (size_t i = 0; i < desc->nframes; ++i) {
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mDescription->frames[i].script());
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mDescription->frames[i].fun());
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}
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}
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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class JSStackFrame : public nsIStackFrame
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(JSStackFrame)
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NS_DECL_NSISTACKFRAME
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// A null aStackDescription or an aIndex that's out of range for the
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// number of frames aStackDescription has will mean that the
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// JSStackFrame will never look at the stack description. Instead,
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// it is expected to be initialized by the caller as needed.
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JSStackFrame(StackDescriptionOwner* aStackDescription, size_t aIndex);
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virtual ~JSStackFrame();
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static already_AddRefed<nsIStackFrame>
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CreateStack(JSContext* cx);
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static already_AddRefed<nsIStackFrame>
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CreateStackFrameLocation(uint32_t aLanguage,
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const char* aFilename,
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const char* aFunctionName,
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int32_t aLineNumber,
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nsIStackFrame* aCaller);
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private:
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bool IsJSFrame() const {
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return mLanguage == nsIProgrammingLanguage::JAVASCRIPT;
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}
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const char* GetFilename();
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const char* GetFunname();
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int32_t GetLineno();
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nsRefPtr<StackDescriptionOwner> mStackDescription;
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nsCOMPtr<nsIStackFrame> mCaller;
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// Cached values
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char* mFilename;
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char* mFunname;
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int32_t mLineno;
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uint32_t mLanguage;
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size_t mIndex;
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bool mFilenameInitialized;
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bool mFunnameInitialized;
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bool mLinenoInitialized;
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bool mCallerInitialized;
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};
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JSStackFrame::JSStackFrame(StackDescriptionOwner* aStackDescription,
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size_t aIndex)
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: mFilename(nullptr),
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mFunname(nullptr),
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mLineno(0)
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{
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if (aStackDescription && aIndex < aStackDescription->NumFrames()) {
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mStackDescription = aStackDescription;
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mIndex = aIndex;
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mFilenameInitialized = false;
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mFunnameInitialized = false;
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mLinenoInitialized = false;
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mCallerInitialized = false;
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mLanguage = nsIProgrammingLanguage::JAVASCRIPT;
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} else {
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MOZ_ASSERT(!mStackDescription);
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mIndex = 0;
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mFilenameInitialized = true;
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mFunnameInitialized = true;
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mLinenoInitialized = true;
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mCallerInitialized = true;
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mLanguage = nsIProgrammingLanguage::UNKNOWN;
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}
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}
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JSStackFrame::~JSStackFrame()
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{
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if (mFilename) {
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nsMemory::Free(mFilename);
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}
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if (mFunname) {
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nsMemory::Free(mFunname);
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}
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}
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NS_IMPL_CYCLE_COLLECTION_2(JSStackFrame, mStackDescription, mCaller)
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NS_IMPL_CYCLE_COLLECTING_ADDREF(JSStackFrame)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(JSStackFrame)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JSStackFrame)
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NS_INTERFACE_MAP_ENTRY(nsIStackFrame)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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/* readonly attribute uint32_t language; */
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NS_IMETHODIMP JSStackFrame::GetLanguage(uint32_t* aLanguage)
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{
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*aLanguage = mLanguage;
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return NS_OK;
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}
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/* readonly attribute string languageName; */
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NS_IMETHODIMP JSStackFrame::GetLanguageName(char** aLanguageName)
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{
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static const char js[] = "JavaScript";
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static const char cpp[] = "C++";
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if (IsJSFrame()) {
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*aLanguageName = (char*) nsMemory::Clone(js, sizeof(js));
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} else {
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*aLanguageName = (char*) nsMemory::Clone(cpp, sizeof(cpp));
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}
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return NS_OK;
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}
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const char*
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JSStackFrame::GetFilename()
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{
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if (!mFilenameInitialized) {
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JS::FrameDescription& desc = mStackDescription->FrameAt(mIndex);
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if (desc.script()) {
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// This cx dance is silly, since JS_GetScriptFilename ignores
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// its cx argument.
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JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
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JSAutoRequest ar(cx);
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JSAutoCompartment ac(cx, desc.script());
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const char* filename = JS_GetScriptFilename(cx, desc.script());
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if (filename) {
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mFilename =
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(char*)nsMemory::Clone(filename, sizeof(char)*(strlen(filename)+1));
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}
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}
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mFilenameInitialized = true;
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}
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return mFilename;
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}
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/* readonly attribute string filename; */
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NS_IMETHODIMP JSStackFrame::GetFilename(char** aFilename)
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{
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NS_ENSURE_ARG_POINTER(aFilename);
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const char* filename = GetFilename();
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if (filename) {
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*aFilename = (char*) nsMemory::Clone(filename,
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sizeof(char)*(strlen(filename)+1));
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} else {
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*aFilename = nullptr;
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}
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return NS_OK;
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}
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const char*
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JSStackFrame::GetFunname()
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{
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if (!mFunnameInitialized) {
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JS::FrameDescription& desc = mStackDescription->FrameAt(mIndex);
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if (desc.fun() && desc.script()) {
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JSContext* cx = nsContentUtils::GetDefaultJSContextForThread();
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JSAutoRequest ar(cx);
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JSAutoCompartment ac(cx, desc.script());
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JS::Rooted<JSFunction*> fun(cx, desc.fun());
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JS::Rooted<JSString*> funid(cx, JS_GetFunctionDisplayId(fun));
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if (funid) {
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size_t length = JS_GetStringEncodingLength(cx, funid);
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if (length != size_t(-1)) {
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mFunname = static_cast<char *>(nsMemory::Alloc(length + 1));
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if (mFunname) {
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JS_EncodeStringToBuffer(cx, funid, mFunname, length);
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mFunname[length] = '\0';
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}
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}
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}
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}
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mFunnameInitialized = true;
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}
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return mFunname;
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}
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/* readonly attribute string name; */
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NS_IMETHODIMP JSStackFrame::GetName(char** aFunction)
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{
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NS_ENSURE_ARG_POINTER(aFunction);
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const char* funname = GetFunname();
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if (funname) {
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*aFunction = (char*) nsMemory::Clone(funname,
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sizeof(char)*(strlen(funname)+1));
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} else {
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*aFunction = nullptr;
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}
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return NS_OK;
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}
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int32_t
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JSStackFrame::GetLineno()
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{
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if (!mLinenoInitialized) {
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JS::FrameDescription& desc = mStackDescription->FrameAt(mIndex);
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mLineno = desc.lineno();
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mLinenoInitialized = true;
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}
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return mLineno;
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}
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/* readonly attribute int32_t lineNumber; */
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NS_IMETHODIMP JSStackFrame::GetLineNumber(int32_t* aLineNumber)
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{
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*aLineNumber = GetLineno();
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return NS_OK;
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}
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/* readonly attribute string sourceLine; */
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NS_IMETHODIMP JSStackFrame::GetSourceLine(char** aSourceLine)
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{
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*aSourceLine = nullptr;
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return NS_OK;
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}
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/* readonly attribute nsIStackFrame caller; */
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NS_IMETHODIMP JSStackFrame::GetCaller(nsIStackFrame** aCaller)
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{
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if (!mCallerInitialized) {
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mCaller = new JSStackFrame(mStackDescription, mIndex+1);
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mCallerInitialized = true;
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}
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NS_IF_ADDREF(*aCaller = mCaller);
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return NS_OK;
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}
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/* string toString (); */
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NS_IMETHODIMP JSStackFrame::ToString(char** _retval)
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{
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const char* frametype = IsJSFrame() ? "JS" : "native";
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const char* filename = GetFilename();
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if (!filename) {
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filename = "<unknown filename>";
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}
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const char* funname = GetFunname();
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if (!funname) {
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funname = "<TOP_LEVEL>";
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}
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static const char format[] = "%s frame :: %s :: %s :: line %d";
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int len = sizeof(char)*
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(strlen(frametype) + strlen(filename) + strlen(funname)) +
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sizeof(format) + 3 * sizeof(mLineno);
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char* buf = (char*) nsMemory::Alloc(len);
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JS_snprintf(buf, len, format, frametype, filename, funname, GetLineno());
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*_retval = buf;
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return NS_OK;
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}
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/* static */ already_AddRefed<nsIStackFrame>
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JSStackFrame::CreateStack(JSContext* cx)
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{
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static const unsigned MAX_FRAMES = 100;
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JS::StackDescription* desc = JS::DescribeStack(cx, MAX_FRAMES);
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if (!desc) {
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return nullptr;
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}
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nsRefPtr<StackDescriptionOwner> descOwner = new StackDescriptionOwner(desc);
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nsRefPtr<JSStackFrame> first = new JSStackFrame(descOwner, 0);
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return first.forget();
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}
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/* static */ already_AddRefed<nsIStackFrame>
|
|
JSStackFrame::CreateStackFrameLocation(uint32_t aLanguage,
|
|
const char* aFilename,
|
|
const char* aFunctionName,
|
|
int32_t aLineNumber,
|
|
nsIStackFrame* aCaller)
|
|
{
|
|
nsRefPtr<JSStackFrame> self = new JSStackFrame(nullptr, 0);
|
|
|
|
self->mLanguage = aLanguage;
|
|
self->mLineno = aLineNumber;
|
|
|
|
if (aFilename) {
|
|
self->mFilename =
|
|
(char*)nsMemory::Clone(aFilename, sizeof(char)*(strlen(aFilename)+1));
|
|
}
|
|
|
|
if (aFunctionName) {
|
|
self->mFunname =
|
|
(char*)nsMemory::Clone(aFunctionName,
|
|
sizeof(char)*(strlen(aFunctionName)+1));
|
|
}
|
|
|
|
self->mCaller = aCaller;
|
|
|
|
return self.forget();
|
|
}
|
|
|
|
already_AddRefed<nsIStackFrame>
|
|
CreateStack(JSContext* cx)
|
|
{
|
|
return JSStackFrame::CreateStack(cx);
|
|
}
|
|
|
|
already_AddRefed<nsIStackFrame>
|
|
CreateStackFrameLocation(uint32_t aLanguage,
|
|
const char* aFilename,
|
|
const char* aFunctionName,
|
|
int32_t aLineNumber,
|
|
nsIStackFrame* aCaller)
|
|
{
|
|
return JSStackFrame::CreateStackFrameLocation(aLanguage, aFilename,
|
|
aFunctionName, aLineNumber,
|
|
aCaller);
|
|
}
|
|
|
|
} // namespace exceptions
|
|
} // namespace dom
|
|
} // namespace mozilla
|