Backed out changeset 9062e17fe15c (bug 1676361) on devs request. CLOSED TREE

docshell/base/nsDocShell.cpp

@@ -51,7 +51,6 @@
 #include "mozilla/Unused.h"
 #include "mozilla/WidgetUtils.h"
 
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ChildProcessChannelListener.h"
 #include "mozilla/dom/ClientChannelHelper.h"
 #include "mozilla/dom/ClientHandle.h"

dom/base/BodyStream.cpp

@@ -6,7 +6,6 @@
 
 #include "BodyStream.h"
 #include "mozilla/CycleCollectedJSContext.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/DOMException.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/WorkerCommon.h"

dom/base/CustomElementRegistry.cpp

@@ -8,7 +8,6 @@
 
 #include "mozilla/AsyncEventDispatcher.h"
 #include "mozilla/CycleCollectedJSContext.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/CustomElementRegistryBinding.h"
 #include "mozilla/dom/ElementBinding.h"
 #include "mozilla/dom/HTMLElementBinding.h"

dom/base/nsContentUtils.cpp

@@ -126,7 +126,6 @@
 #include "mozilla/Variant.h"
 #include "mozilla/ViewportUtils.h"
 #include "mozilla/dom/AncestorIterator.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/AutocompleteInfoBinding.h"
 #include "mozilla/dom/AutoSuppressEventHandlingAndSuspend.h"
 #include "mozilla/dom/BindingDeclarations.h"

dom/base/nsFrameMessageManager.cpp

@@ -40,7 +40,6 @@
 #include "mozilla/TimeStamp.h"
 #include "mozilla/TypedEnumBits.h"
 #include "mozilla/UniquePtr.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingDeclarations.h"
 #include "mozilla/dom/CallbackObject.h"
 #include "mozilla/dom/ChildProcessMessageManager.h"

dom/base/nsGlobalWindowInner.cpp

@@ -86,7 +86,6 @@
 #include "mozilla/UniquePtr.h"
 #include "mozilla/Unused.h"
 #include "mozilla/dom/AudioContext.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BarProps.h"
 #include "mozilla/dom/BindingDeclarations.h"
 #include "mozilla/dom/BindingUtils.h"

dom/bindings/CallbackObject.h

@@ -30,7 +30,6 @@
 #include "mozilla/Maybe.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/RefPtr.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingCallContext.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "nsCOMPtr.h"

dom/fetch/FetchStreamReader.cpp

@@ -8,7 +8,6 @@
 #include "InternalResponse.h"
 #include "js/Stream.h"
 #include "mozilla/ConsoleReportCollector.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/DOMException.h"
 #include "mozilla/dom/Promise.h"
 #include "mozilla/dom/PromiseBinding.h"

dom/ipc/SharedMap.cpp

@@ -10,7 +10,6 @@
 #include "MemMapSnapshot.h"
 #include "ScriptPreloader-inl.h"
 
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BlobImpl.h"
 #include "mozilla/dom/ContentParent.h"
 #include "mozilla/dom/ContentProcessMessageManager.h"

dom/ipc/jsactor/JSActor.cpp

@@ -10,7 +10,6 @@
 #include "chrome/common/ipc_channel.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/FunctionRef.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ClonedErrorHolder.h"
 #include "mozilla/dom/ClonedErrorHolderBinding.h"
 #include "mozilla/dom/DOMException.h"

dom/ipc/jsactor/JSActorManager.cpp

@@ -5,8 +5,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/dom/JSActorManager.h"
-
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/JSActorService.h"
 #include "mozilla/dom/PWindowGlobal.h"
 #include "mozilla/ipc/ProtocolUtils.h"

dom/jsurl/nsJSProtocolHandler.cpp

@@ -42,7 +42,6 @@
 #include "nsSandboxFlags.h"
 #include "mozilla/BasePrincipal.h"
 #include "mozilla/CycleCollectedJSContext.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/DOMSecurityMonitor.h"
 #include "mozilla/dom/JSExecutionContext.h"
 #include "mozilla/dom/ScriptSettings.h"

dom/l10n/DOMLocalization.cpp

@@ -10,7 +10,6 @@
 #include "nsIScriptError.h"
 #include "DOMLocalization.h"
 #include "mozilla/intl/LocaleService.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/L10nOverlays.h"
 

dom/l10n/DocumentL10n.cpp

@@ -6,7 +6,6 @@
 
 #include "DocumentL10n.h"
 #include "nsIContentSink.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/Document.h"
 #include "mozilla/dom/DocumentL10nBinding.h"
 #include "mozilla/Telemetry.h"

dom/media/webaudio/AudioWorkletNode.cpp

@@ -14,7 +14,6 @@
 #include "js/experimental/TypedData.h"  // JS_NewFloat32Array, JS_GetFloat32ArrayData, JS_GetTypedArrayLength, JS_GetArrayBufferViewBuffer
 #include "mozilla/dom/AudioWorkletNodeBinding.h"
 #include "mozilla/dom/AudioParamMapBinding.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/RootedDictionary.h"
 #include "mozilla/dom/ErrorEvent.h"
 #include "mozilla/dom/Worklet.h"

dom/media/webrtc/jsapi/RTCStatsReport.h

@@ -10,8 +10,8 @@
 #include "nsWrapperCache.h"
 #include "nsCOMPtr.h"
 
-#include "nsPIDOMWindow.h"  // nsPIDOMWindowInner
-#include "mozilla/dom/AutoEntryScript.h"
+#include "nsPIDOMWindow.h"               // nsPIDOMWindowInner
+#include "mozilla/dom/ScriptSettings.h"  // AutoEntryScript
 #include "nsIGlobalObject.h"
 #include "js/RootingAPI.h"  // JS::Rooted
 #include "js/Value.h"

dom/plugins/base/nsJSNPRuntime.cpp

@@ -32,7 +32,6 @@
 #include "mozilla/HashFunctions.h"
 #include "mozilla/ProfilerLabels.h"
 #include "mozilla/UniquePtr.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ScriptSettings.h"
 
 #define NPRUNTIME_JSCLASS_NAME "NPObject JS wrapper class"

dom/plugins/base/nsNPAPIPlugin.cpp

@@ -32,7 +32,6 @@
 
 #include "nsPIDOMWindow.h"
 #include "nsGlobalWindow.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/Document.h"
 #include "nsIContent.h"
 #include "nsIIDNService.h"

dom/promise/Promise.cpp

@@ -18,7 +18,6 @@
 #include "mozilla/ResultExtensions.h"
 #include "mozilla/Unused.h"
 
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/DOMException.h"
 #include "mozilla/dom/DOMExceptionBinding.h"

dom/promise/Promise.h

@@ -19,7 +19,6 @@
 #include "mozilla/RefPtr.h"
 #include "mozilla/Result.h"
 #include "mozilla/WeakPtr.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/ToJSValue.h"
 #include "nsCycleCollectionParticipant.h"

dom/prototype/PrototypeDocumentContentSink.cpp

@@ -38,7 +38,6 @@
 #include "nsMimeTypes.h"
 #include "nsHtml5SVGLoadDispatcher.h"
 #include "nsTextNode.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/CDATASection.h"
 #include "mozilla/dom/Comment.h"
 #include "mozilla/dom/DocumentType.h"

dom/script/AutoEntryScript.cpp

@@ -1,164 +0,0 @@
-/* -*- 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 "mozilla/dom/AutoEntryScript.h"
-
-#include <stdint.h>
-#include <utility>
-#include "js/ProfilingCategory.h"
-#include "js/ProfilingStack.h"
-#include "jsapi.h"
-#include "mozilla/Assertions.h"
-#include "mozilla/Maybe.h"
-#include "mozilla/Span.h"
-#include "nsCOMPtr.h"
-#include "nsContentUtils.h"
-#include "nsGlobalWindowInner.h"
-#include "nsIDocShell.h"
-#include "nsJSUtils.h"
-#include "nsPIDOMWindow.h"
-#include "nsPIDOMWindowInlines.h"
-#include "nsString.h"
-#include "xpcpublic.h"
-
-namespace mozilla::dom {
-
-namespace {
-// Assert if it's not safe to run script. The helper class
-// AutoAllowLegacyScriptExecution allows to allow-list
-// legacy cases where it's actually not safe to run script.
-#ifdef DEBUG
-void AssertIfNotSafeToRunScript() {
-  // if it's safe to run script, then there is nothing to do here.
-  if (nsContentUtils::IsSafeToRunScript()) {
-    return;
-  }
-
-  // auto allowing legacy script execution is fine for now.
-  if (AutoAllowLegacyScriptExecution::IsAllowed()) {
-    return;
-  }
-
-  MOZ_ASSERT(false, "is it safe to run script?");
-}
-#endif
-
-static unsigned long gRunToCompletionListeners = 0;
-
-}  // namespace
-
-void UseEntryScriptProfiling() {
-  MOZ_ASSERT(NS_IsMainThread());
-  ++gRunToCompletionListeners;
-}
-
-void UnuseEntryScriptProfiling() {
-  MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(gRunToCompletionListeners > 0);
-  --gRunToCompletionListeners;
-}
-
-AutoEntryScript::AutoEntryScript(nsIGlobalObject* aGlobalObject,
-                                 const char* aReason, bool aIsMainThread)
-    : AutoJSAPI(aGlobalObject, aIsMainThread, eEntryScript),
-      mWebIDLCallerPrincipal(nullptr)
-      // This relies on us having a cx() because the AutoJSAPI constructor
-      // already ran.
-      ,
-      mCallerOverride(cx())
-#ifdef MOZ_GECKO_PROFILER
-      ,
-      mAutoProfilerLabel(
-          "", aReason, JS::ProfilingCategoryPair::JS,
-          uint32_t(js::ProfilingStackFrame::Flags::RELEVANT_FOR_JS))
-#endif
-      ,
-      mJSThreadExecution(aGlobalObject, aIsMainThread) {
-  MOZ_ASSERT(aGlobalObject);
-
-  if (aIsMainThread) {
-#ifdef DEBUG
-    AssertIfNotSafeToRunScript();
-#endif
-    if (gRunToCompletionListeners > 0) {
-      mDocShellEntryMonitor.emplace(cx(), aReason);
-    }
-    mScriptActivity.emplace(true);
-  }
-}
-
-AutoEntryScript::AutoEntryScript(JSObject* aObject, const char* aReason,
-                                 bool aIsMainThread)
-    : AutoEntryScript(xpc::NativeGlobal(aObject), aReason, aIsMainThread) {
-  // xpc::NativeGlobal uses JS::GetNonCCWObjectGlobal, which asserts that
-  // aObject is not a CCW.
-}
-
-AutoEntryScript::~AutoEntryScript() = default;
-
-AutoEntryScript::DocshellEntryMonitor::DocshellEntryMonitor(JSContext* aCx,
-                                                            const char* aReason)
-    : JS::dbg::AutoEntryMonitor(aCx), mReason(aReason) {}
-
-void AutoEntryScript::DocshellEntryMonitor::Entry(
-    JSContext* aCx, JSFunction* aFunction, JSScript* aScript,
-    JS::Handle<JS::Value> aAsyncStack, const char* aAsyncCause) {
-  JS::Rooted<JSFunction*> rootedFunction(aCx);
-  if (aFunction) {
-    rootedFunction = aFunction;
-  }
-  JS::Rooted<JSScript*> rootedScript(aCx);
-  if (aScript) {
-    rootedScript = aScript;
-  }
-
-  nsCOMPtr<nsPIDOMWindowInner> window = xpc::CurrentWindowOrNull(aCx);
-  if (!window || !window->GetDocShell() ||
-      !window->GetDocShell()->GetRecordProfileTimelineMarkers()) {
-    return;
-  }
-
-  nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
-
-  nsAutoJSString functionName;
-  if (rootedFunction) {
-    JS::Rooted<JSString*> displayId(aCx,
-                                    JS_GetFunctionDisplayId(rootedFunction));
-    if (displayId) {
-      if (!functionName.init(aCx, displayId)) {
-        JS_ClearPendingException(aCx);
-        return;
-      }
-    }
-  }
-
-  nsString filename;
-  uint32_t lineNumber = 0;
-  if (!rootedScript) {
-    rootedScript = JS_GetFunctionScript(aCx, rootedFunction);
-  }
-  if (rootedScript) {
-    CopyUTF8toUTF16(MakeStringSpan(JS_GetScriptFilename(rootedScript)),
-                    filename);
-    lineNumber = JS_GetScriptBaseLineNumber(aCx, rootedScript);
-  }
-
-  if (!filename.IsEmpty() || !functionName.IsEmpty()) {
-    docShellForJSRunToCompletion->NotifyJSRunToCompletionStart(
-        mReason, functionName, filename, lineNumber, aAsyncStack, aAsyncCause);
-  }
-}
-
-void AutoEntryScript::DocshellEntryMonitor::Exit(JSContext* aCx) {
-  nsCOMPtr<nsPIDOMWindowInner> window = xpc::CurrentWindowOrNull(aCx);
-  // Not really worth checking GetRecordProfileTimelineMarkers here.
-  if (window && window->GetDocShell()) {
-    nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
-    docShellForJSRunToCompletion->NotifyJSRunToCompletionStop();
-  }
-}
-
-}  // namespace mozilla::dom

dom/script/AutoEntryScript.h

@@ -1,125 +0,0 @@
-/* -*- 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/. */
-
-#ifndef DOM_SCRIPT_AUTOENTRYSCRIPT_H_
-#define DOM_SCRIPT_AUTOENTRYSCRIPT_H_
-
-#include "MainThreadUtils.h"
-#include "js/Debug.h"
-//#include "js/RootingAPI.h"
-#include "js/TypeDecls.h"
-#include "jsapi.h"
-#include "mozilla/Attributes.h"
-#include "mozilla/Maybe.h"
-#include "mozilla/dom/JSExecutionManager.h"
-#include "mozilla/dom/ScriptSettings.h"
-
-#ifdef MOZ_GECKO_PROFILER
-#  include "GeckoProfiler.h"
-#endif
-
-class nsIGlobalObject;
-class nsIPrincipal;
-
-namespace xpc {
-class AutoScriptActivity;
-}
-
-namespace mozilla::dom {
-/*
- * Static helpers in ScriptSettings which track the number of listeners
- * of Javascript RunToCompletion events.  These should be used by the code in
- * nsDocShell::SetRecordProfileTimelineMarkers to indicate to script
- * settings that script run-to-completion needs to be monitored.
- * SHOULD BE CALLED ONLY BY MAIN THREAD.
- */
-void UseEntryScriptProfiling();
-void UnuseEntryScriptProfiling();
-
-/*
- * A class that represents a new script entry point.
- *
- * |aReason| should be a statically-allocated C string naming the reason we're
- * invoking JavaScript code: "setTimeout", "event", and so on. The devtools use
- * these strings to label JS execution in timeline and profiling displays.
- *
- */
-class MOZ_STACK_CLASS AutoEntryScript : public AutoJSAPI {
- public:
-  // Constructing the AutoEntryScript will ensure that it enters the
-  // Realm of aGlobalObject's JSObject and exposes that JSObject to active JS.
-  AutoEntryScript(nsIGlobalObject* aGlobalObject, const char* aReason,
-                  bool aIsMainThread = NS_IsMainThread());
-
-  // aObject can be any object from the relevant global. It must not be a
-  // cross-compartment wrapper because CCWs are not associated with a single
-  // global.
-  //
-  // Constructing the AutoEntryScript will ensure that it enters the
-  // Realm of aObject JSObject and exposes aObject's global to active JS.
-  AutoEntryScript(JSObject* aObject, const char* aReason,
-                  bool aIsMainThread = NS_IsMainThread());
-
-  ~AutoEntryScript();
-
-  void SetWebIDLCallerPrincipal(nsIPrincipal* aPrincipal) {
-    mWebIDLCallerPrincipal = aPrincipal;
-  }
-
- private:
-  // A subclass of AutoEntryMonitor that notifies the docshell.
-  class DocshellEntryMonitor final : public JS::dbg::AutoEntryMonitor {
-   public:
-    DocshellEntryMonitor(JSContext* aCx, const char* aReason);
-
-    // Please note that |aAsyncCause| here is owned by the caller, and its
-    // lifetime must outlive the lifetime of the DocshellEntryMonitor object.
-    // In practice, |aAsyncCause| is identical to |aReason| passed into
-    // the AutoEntryScript constructor, so the lifetime requirements are
-    // trivially satisfied by |aReason| being a statically allocated string.
-    void Entry(JSContext* aCx, JSFunction* aFunction,
-               JS::Handle<JS::Value> aAsyncStack,
-               const char* aAsyncCause) override {
-      Entry(aCx, aFunction, nullptr, aAsyncStack, aAsyncCause);
-    }
-
-    void Entry(JSContext* aCx, JSScript* aScript,
-               JS::Handle<JS::Value> aAsyncStack,
-               const char* aAsyncCause) override {
-      Entry(aCx, nullptr, aScript, aAsyncStack, aAsyncCause);
-    }
-
-    void Exit(JSContext* aCx) override;
-
-   private:
-    void Entry(JSContext* aCx, JSFunction* aFunction, JSScript* aScript,
-               JS::Handle<JS::Value> aAsyncStack, const char* aAsyncCause);
-
-    const char* mReason;
-  };
-
-  // It's safe to make this a weak pointer, since it's the subject principal
-  // when we go on the stack, so can't go away until after we're gone.  In
-  // particular, this is only used from the CallSetup constructor, and only in
-  // the aIsJSImplementedWebIDL case.  And in that case, the subject principal
-  // is the principal of the callee function that is part of the CallArgs just a
-  // bit up the stack, and which will outlive us.  So we know the principal
-  // can't go away until then either.
-  nsIPrincipal* MOZ_NON_OWNING_REF mWebIDLCallerPrincipal;
-  friend nsIPrincipal* GetWebIDLCallerPrincipal();
-
-  Maybe<DocshellEntryMonitor> mDocShellEntryMonitor;
-  Maybe<xpc::AutoScriptActivity> mScriptActivity;
-  JS::AutoHideScriptedCaller mCallerOverride;
-#ifdef MOZ_GECKO_PROFILER
-  AutoProfilerLabel mAutoProfilerLabel;
-#endif
-  AutoRequestJSThreadExecution mJSThreadExecution;
-};
-
-}  // namespace mozilla::dom
-
-#endif  // DOM_SCRIPT_AUTOENTRYSCRIPT_H_

dom/script/ScriptLoader.cpp

@@ -29,7 +29,6 @@
 #include "nsCycleCollectionParticipant.h"
 #include "nsIContent.h"
 #include "nsJSUtils.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/DocGroup.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/JSExecutionContext.h"

dom/script/ScriptSettings.cpp

@@ -5,47 +5,32 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/dom/ScriptSettings.h"
-
-#include <utility>
 #include "LoadedScript.h"
-#include "MainThreadUtils.h"
-#include "js/CharacterEncoding.h"
-#include "js/CompilationAndEvaluation.h"
-#include "js/Conversions.h"
-#include "js/ErrorReport.h"
-#include "js/Exception.h"
-#include "js/GCAPI.h"
-#include "js/TypeDecls.h"
-#include "js/Value.h"
-#include "js/Warnings.h"
-#include "js/Wrapper.h"
-#include "js/friend/ErrorMessages.h"
-#include "jsapi.h"
 #include "mozilla/Assertions.h"
 #include "mozilla/BasePrincipal.h"
 #include "mozilla/CycleCollectedJSContext.h"
-#include "mozilla/DebugOnly.h"
-#include "mozilla/Maybe.h"
-#include "mozilla/RefPtr.h"
 #include "mozilla/ThreadLocal.h"
-#include "mozilla/dom/AutoEntryScript.h"
-#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/Maybe.h"
 #include "mozilla/dom/Document.h"
 #include "mozilla/dom/Element.h"
-#include "mozilla/dom/ScriptLoadRequest.h"
-#include "mozilla/dom/WorkerCommon.h"
-#include "nsContentUtils.h"
-#include "nsDebug.h"
-#include "nsGlobalWindowInner.h"
-#include "nsIGlobalObject.h"
-#include "nsINode.h"
-#include "nsIPrincipal.h"
-#include "nsISupports.h"
-#include "nsJSUtils.h"
-#include "nsPIDOMWindow.h"
-#include "nsString.h"
-#include "nscore.h"
+#include "mozilla/dom/JSExecutionManager.h"
+#include "mozilla/dom/WorkerPrivate.h"
+
+#include "jsapi.h"
+#include "js/CompilationAndEvaluation.h"
+#include "js/friend/ErrorMessages.h"  // JSMSG_OUT_OF_MEMORY
+#include "js/Warnings.h"              // JS::{Get,}WarningReporter
 #include "xpcpublic.h"
+#include "nsIGlobalObject.h"
+#include "nsIDocShell.h"
+#include "nsIScriptGlobalObject.h"
+#include "nsIScriptContext.h"
+#include "nsContentUtils.h"
+#include "nsGlobalWindow.h"
+#include "nsPIDOMWindow.h"
+#include "nsTArray.h"
+#include "nsJSUtils.h"
+#include "nsDOMJSUtils.h"
 
 namespace mozilla {
 namespace dom {
@@ -81,6 +66,25 @@ JSObject* GetElementCallback(JSContext* aCx, JS::HandleValue aValue) {
 
 static MOZ_THREAD_LOCAL(ScriptSettingsStackEntry*) sScriptSettingsTLS;
 
+// Assert if it's not safe to run script. The helper class
+// AutoAllowLegacyScriptExecution allows to allow-list
+// legacy cases where it's actually not safe to run script.
+#ifdef DEBUG
+static void AssertIfNotSafeToRunScript() {
+  // if it's safe to run script, then there is nothing to do here.
+  if (nsContentUtils::IsSafeToRunScript()) {
+    return;
+  }
+
+  // auto allowing legacy script execution is fine for now.
+  if (AutoAllowLegacyScriptExecution::IsAllowed()) {
+    return;
+  }
+
+  MOZ_ASSERT(false, "is it safe to run script?");
+}
+#endif
+
 class ScriptSettingsStack {
  public:
   static ScriptSettingsStackEntry* Top() { return sScriptSettingsTLS.get(); }
@@ -148,6 +152,19 @@ class ScriptSettingsStack {
 #endif  // DEBUG
 };
 
+static unsigned long gRunToCompletionListeners = 0;
+
+void UseEntryScriptProfiling() {
+  MOZ_ASSERT(NS_IsMainThread());
+  ++gRunToCompletionListeners;
+}
+
+void UnuseEntryScriptProfiling() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(gRunToCompletionListeners > 0);
+  --gRunToCompletionListeners;
+}
+
 void InitScriptSettings() {
   bool success = sScriptSettingsTLS.init();
   if (!success) {
@@ -615,6 +632,106 @@ bool AutoJSAPI::IsStackTop() const {
 }
 #endif  // DEBUG
 
+AutoEntryScript::AutoEntryScript(nsIGlobalObject* aGlobalObject,
+                                 const char* aReason, bool aIsMainThread)
+    : AutoJSAPI(aGlobalObject, aIsMainThread, eEntryScript),
+      mWebIDLCallerPrincipal(nullptr)
+      // This relies on us having a cx() because the AutoJSAPI constructor
+      // already ran.
+      ,
+      mCallerOverride(cx())
+#ifdef MOZ_GECKO_PROFILER
+      ,
+      mAutoProfilerLabel(
+          "", aReason, JS::ProfilingCategoryPair::JS,
+          uint32_t(js::ProfilingStackFrame::Flags::RELEVANT_FOR_JS))
+#endif
+      ,
+      mJSThreadExecution(aGlobalObject, aIsMainThread) {
+  MOZ_ASSERT(aGlobalObject);
+
+  if (aIsMainThread) {
+#ifdef DEBUG
+    AssertIfNotSafeToRunScript();
+#endif
+    if (gRunToCompletionListeners > 0) {
+      mDocShellEntryMonitor.emplace(cx(), aReason);
+    }
+    mScriptActivity.emplace(true);
+  }
+}
+
+AutoEntryScript::AutoEntryScript(JSObject* aObject, const char* aReason,
+                                 bool aIsMainThread)
+    : AutoEntryScript(xpc::NativeGlobal(aObject), aReason, aIsMainThread) {
+  // xpc::NativeGlobal uses JS::GetNonCCWObjectGlobal, which asserts that
+  // aObject is not a CCW.
+}
+
+AutoEntryScript::~AutoEntryScript() = default;
+
+AutoEntryScript::DocshellEntryMonitor::DocshellEntryMonitor(JSContext* aCx,
+                                                            const char* aReason)
+    : JS::dbg::AutoEntryMonitor(aCx), mReason(aReason) {}
+
+void AutoEntryScript::DocshellEntryMonitor::Entry(
+    JSContext* aCx, JSFunction* aFunction, JSScript* aScript,
+    JS::Handle<JS::Value> aAsyncStack, const char* aAsyncCause) {
+  JS::Rooted<JSFunction*> rootedFunction(aCx);
+  if (aFunction) {
+    rootedFunction = aFunction;
+  }
+  JS::Rooted<JSScript*> rootedScript(aCx);
+  if (aScript) {
+    rootedScript = aScript;
+  }
+
+  nsCOMPtr<nsPIDOMWindowInner> window = xpc::CurrentWindowOrNull(aCx);
+  if (!window || !window->GetDocShell() ||
+      !window->GetDocShell()->GetRecordProfileTimelineMarkers()) {
+    return;
+  }
+
+  nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
+
+  nsAutoJSString functionName;
+  if (rootedFunction) {
+    JS::Rooted<JSString*> displayId(aCx,
+                                    JS_GetFunctionDisplayId(rootedFunction));
+    if (displayId) {
+      if (!functionName.init(aCx, displayId)) {
+        JS_ClearPendingException(aCx);
+        return;
+      }
+    }
+  }
+
+  nsString filename;
+  uint32_t lineNumber = 0;
+  if (!rootedScript) {
+    rootedScript = JS_GetFunctionScript(aCx, rootedFunction);
+  }
+  if (rootedScript) {
+    CopyUTF8toUTF16(MakeStringSpan(JS_GetScriptFilename(rootedScript)),
+                    filename);
+    lineNumber = JS_GetScriptBaseLineNumber(aCx, rootedScript);
+  }
+
+  if (!filename.IsEmpty() || !functionName.IsEmpty()) {
+    docShellForJSRunToCompletion->NotifyJSRunToCompletionStart(
+        mReason, functionName, filename, lineNumber, aAsyncStack, aAsyncCause);
+  }
+}
+
+void AutoEntryScript::DocshellEntryMonitor::Exit(JSContext* aCx) {
+  nsCOMPtr<nsPIDOMWindowInner> window = xpc::CurrentWindowOrNull(aCx);
+  // Not really worth checking GetRecordProfileTimelineMarkers here.
+  if (window && window->GetDocShell()) {
+    nsCOMPtr<nsIDocShell> docShellForJSRunToCompletion = window->GetDocShell();
+    docShellForJSRunToCompletion->NotifyJSRunToCompletionStop();
+  }
+}
+
 AutoIncumbentScript::AutoIncumbentScript(nsIGlobalObject* aGlobalObject)
     : ScriptSettingsStackEntry(aGlobalObject, eIncumbentScript),
       mCallerOverride(nsContentUtils::GetCurrentJSContext()) {

dom/script/ScriptSettings.h

@@ -9,15 +9,23 @@
 #ifndef mozilla_dom_ScriptSettings_h
 #define mozilla_dom_ScriptSettings_h
 
+#include "MainThreadUtils.h"
 #include "xpcpublic.h"
 
 #include "mozilla/dom/JSExecutionManager.h"
 #include "mozilla/Maybe.h"
 
 #include "jsapi.h"
+#include "js/Debug.h"
 #include "js/Warnings.h"  // JS::WarningReporter
 
+#ifdef MOZ_GECKO_PROFILER
+#  include "GeckoProfiler.h"
+#endif
+
+class JSFunction;
 class JSObject;
+class JSScript;
 class nsIGlobalObject;
 class nsIPrincipal;
 class nsPIDOMWindowInner;
@@ -42,6 +50,16 @@ class Document;
 void InitScriptSettings();
 void DestroyScriptSettings();
 
+/*
+ * Static helpers in ScriptSettings which track the number of listeners
+ * of Javascript RunToCompletion events.  These should be used by the code in
+ * nsDocShell::SetRecordProfileTimelineMarkers to indicate to script
+ * settings that script run-to-completion needs to be monitored.
+ * SHOULD BE CALLED ONLY BY MAIN THREAD.
+ */
+void UseEntryScriptProfiling();
+void UnuseEntryScriptProfiling();
+
 // To implement a web-compatible browser, it is often necessary to obtain the
 // global object that is "associated" with the currently-running code. This
 // process is made more complicated by the fact that, historically, different
@@ -299,6 +317,87 @@ class MOZ_STACK_CLASS AutoJSAPI : protected ScriptSettingsStackEntry {
   AutoJSAPI& operator=(const AutoJSAPI&) = delete;
 };
 
+/*
+ * A class that represents a new script entry point.
+ *
+ * |aReason| should be a statically-allocated C string naming the reason we're
+ * invoking JavaScript code: "setTimeout", "event", and so on. The devtools use
+ * these strings to label JS execution in timeline and profiling displays.
+ *
+ */
+class MOZ_STACK_CLASS AutoEntryScript : public AutoJSAPI {
+ public:
+  // Constructing the AutoEntryScript will ensure that it enters the
+  // Realm of aGlobalObject's JSObject and exposes that JSObject to active JS.
+  AutoEntryScript(nsIGlobalObject* aGlobalObject, const char* aReason,
+                  bool aIsMainThread = NS_IsMainThread());
+
+  // aObject can be any object from the relevant global. It must not be a
+  // cross-compartment wrapper because CCWs are not associated with a single
+  // global.
+  //
+  // Constructing the AutoEntryScript will ensure that it enters the
+  // Realm of aObject JSObject and exposes aObject's global to active JS.
+  AutoEntryScript(JSObject* aObject, const char* aReason,
+                  bool aIsMainThread = NS_IsMainThread());
+
+  ~AutoEntryScript();
+
+  void SetWebIDLCallerPrincipal(nsIPrincipal* aPrincipal) {
+    mWebIDLCallerPrincipal = aPrincipal;
+  }
+
+ private:
+  // A subclass of AutoEntryMonitor that notifies the docshell.
+  class DocshellEntryMonitor final : public JS::dbg::AutoEntryMonitor {
+   public:
+    DocshellEntryMonitor(JSContext* aCx, const char* aReason);
+
+    // Please note that |aAsyncCause| here is owned by the caller, and its
+    // lifetime must outlive the lifetime of the DocshellEntryMonitor object.
+    // In practice, |aAsyncCause| is identical to |aReason| passed into
+    // the AutoEntryScript constructor, so the lifetime requirements are
+    // trivially satisfied by |aReason| being a statically allocated string.
+    void Entry(JSContext* aCx, JSFunction* aFunction,
+               JS::Handle<JS::Value> aAsyncStack,
+               const char* aAsyncCause) override {
+      Entry(aCx, aFunction, nullptr, aAsyncStack, aAsyncCause);
+    }
+
+    void Entry(JSContext* aCx, JSScript* aScript,
+               JS::Handle<JS::Value> aAsyncStack,
+               const char* aAsyncCause) override {
+      Entry(aCx, nullptr, aScript, aAsyncStack, aAsyncCause);
+    }
+
+    void Exit(JSContext* aCx) override;
+
+   private:
+    void Entry(JSContext* aCx, JSFunction* aFunction, JSScript* aScript,
+               JS::Handle<JS::Value> aAsyncStack, const char* aAsyncCause);
+
+    const char* mReason;
+  };
+
+  // It's safe to make this a weak pointer, since it's the subject principal
+  // when we go on the stack, so can't go away until after we're gone.  In
+  // particular, this is only used from the CallSetup constructor, and only in
+  // the aIsJSImplementedWebIDL case.  And in that case, the subject principal
+  // is the principal of the callee function that is part of the CallArgs just a
+  // bit up the stack, and which will outlive us.  So we know the principal
+  // can't go away until then either.
+  nsIPrincipal* MOZ_NON_OWNING_REF mWebIDLCallerPrincipal;
+  friend nsIPrincipal* GetWebIDLCallerPrincipal();
+
+  Maybe<DocshellEntryMonitor> mDocShellEntryMonitor;
+  Maybe<xpc::AutoScriptActivity> mScriptActivity;
+  JS::AutoHideScriptedCaller mCallerOverride;
+#ifdef MOZ_GECKO_PROFILER
+  AutoProfilerLabel mAutoProfilerLabel;
+#endif
+  AutoRequestJSThreadExecution mJSThreadExecution;
+};
+
 /*
  * A class that can be used to force a particular incumbent script on the stack.
  */

dom/script/moz.build

@@ -18,7 +18,6 @@ EXPORTS += [
 ]
 
 EXPORTS.mozilla.dom += [
-    "AutoEntryScript.h",
     "LoadedScript.h",
     "ScriptDecoding.h",
     "ScriptElement.h",
@@ -29,7 +28,6 @@ EXPORTS.mozilla.dom += [
 ]
 
 UNIFIED_SOURCES += [
-    "AutoEntryScript.cpp",
     "LoadedScript.cpp",
     "ModuleLoadRequest.cpp",
     "nsIScriptElement.cpp",

dom/workers/WorkerScope.cpp

@@ -39,7 +39,6 @@
 #include "mozilla/StorageAccess.h"
 #include "mozilla/TaskCategory.h"
 #include "mozilla/UniquePtr.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingDeclarations.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/BlobURLProtocolHandler.h"

dom/worklet/Worklet.cpp

@@ -7,7 +7,6 @@
 #include "Worklet.h"
 #include "WorkletThread.h"
 
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/WorkletBinding.h"
 #include "mozilla/dom/WorkletGlobalScope.h"
 #include "mozilla/dom/BlobBinding.h"

ipc/testshell/TestShellParent.cpp

@@ -8,7 +8,6 @@
 #include "jsfriendapi.h"
 #include "mozilla/ArrayUtils.h"
 
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ScriptSettings.h"
 
 #include "xpcpublic.h"

ipc/testshell/XPCShellEnvironment.cpp

@@ -27,7 +27,6 @@
 
 #include "mozilla/Utf8.h"  // mozilla::Utf8Unit
 #include "mozilla/XPCOM.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ScriptSettings.h"
 
 #include "nsIPrincipal.h"

js/xpconnect/loader/mozJSComponentLoader.cpp

@@ -62,7 +62,6 @@
 #include "mozilla/ResultExtensions.h"
 #include "mozilla/ScriptPreloader.h"
 #include "mozilla/ScopeExit.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/ResultExtensions.h"
 #include "mozilla/UniquePtrExtensions.h"

js/xpconnect/src/Sandbox.cpp

@@ -32,7 +32,6 @@
 #include "xpc_make_class.h"
 #include "XPCWrapper.h"
 #include "Crypto.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingCallContext.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/BlobBinding.h"

js/xpconnect/src/XPCJSContext.cpp

@@ -80,6 +80,7 @@
 using namespace mozilla;
 using namespace xpc;
 using namespace JS;
+using mozilla::dom::AutoEntryScript;
 
 // The watchdog thread loop is pretty trivial, and should not require much stack
 // space to do its job. So only give it 32KiB or the platform minimum.

js/xpconnect/src/XPCJSRuntime.cpp

@@ -86,6 +86,7 @@
 using namespace mozilla;
 using namespace xpc;
 using namespace JS;
+using mozilla::dom::AutoEntryScript;
 using mozilla::dom::PerThreadAtomCache;
 
 /***************************************************************************/

js/xpconnect/src/XPCShellImpl.cpp

@@ -15,7 +15,6 @@
 #include "js/PropertySpec.h"
 #include "js/SourceText.h"  // JS::SourceText
 #include "mozilla/ChaosMode.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/IOInterposer.h"
 #include "mozilla/Preferences.h"

js/xpconnect/src/XPCWrappedJSClass.cpp

@@ -17,7 +17,6 @@
 #include "nsJSUtils.h"
 #include "nsPrintfCString.h"
 #include "mozilla/Attributes.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingUtils.h"
 #include "mozilla/dom/DOMException.h"
 #include "mozilla/dom/DOMExceptionBinding.h"

js/xpconnect/src/xpcprivate.h

@@ -161,7 +161,6 @@
 
 namespace mozilla {
 namespace dom {
-class AutoEntryScript;
 class Exception;
 }  // namespace dom
 }  // namespace mozilla

toolkit/components/extensions/webrequest/StreamFilter.cpp

@@ -15,7 +15,6 @@
 #include "mozilla/extensions/StreamFilterChild.h"
 #include "mozilla/extensions/StreamFilterEvents.h"
 #include "mozilla/extensions/StreamFilterParent.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/ipc/Endpoint.h"
 #include "nsContentUtils.h"

xpcom/base/CycleCollectedJSRuntime.cpp

@@ -77,7 +77,6 @@
 #include "mozilla/TimelineConsumers.h"
 #include "mozilla/TimelineMarker.h"
 #include "mozilla/Unused.h"
-#include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/DOMJSClass.h"
 #include "mozilla/dom/JSExecutionManager.h"
 #include "mozilla/dom/ProfileTimelineMarkerBinding.h"