Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 188 insertions, 0 deletions

diff --git a/dom/bindings/nsScriptErrorWithStack.cpp b/dom/bindings/nsScriptErrorWithStack.cpp
new file mode 100644
index 0000000000..8b5f0bda9f
--- /dev/null
+++ b/dom/bindings/nsScriptErrorWithStack.cpp
@@ -0,0 +1,188 @@
+/* -*- 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/. */
+
+/*
+ * 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 "nsGlobalWindow.h"
+#include "nsCycleCollectionParticipant.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();
+}