Adding upstream version 115.7.0esr.upstream/115.7.0esr

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

1 files changed, 218 insertions, 0 deletions

diff --git a/dom/script/ScriptLoadContext.cpp b/dom/script/ScriptLoadContext.cpp
new file mode 100644
index 0000000000..8bc2275ae3
--- /dev/null
+++ b/dom/script/ScriptLoadContext.cpp
@@ -0,0 +1,218 @@
+/* -*- 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 "GeckoProfiler.h"
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "mozilla/StaticPrefs_dom.h"
+#include "mozilla/Unused.h"
+#include "mozilla/Utf8.h"  // mozilla::Utf8Unit
+
+#include "js/OffThreadScriptCompilation.h"
+#include "js/SourceText.h"
+#include "js/loader/LoadContextBase.h"
+#include "js/loader/ModuleLoadRequest.h"
+
+#include "ScriptLoadContext.h"
+#include "ModuleLoadRequest.h"
+#include "nsContentUtils.h"
+#include "nsICacheInfoChannel.h"
+#include "nsIClassOfService.h"
+#include "nsISupportsPriority.h"
+
+namespace mozilla::dom {
+
+//////////////////////////////////////////////////////////////
+// ScriptLoadContext
+//////////////////////////////////////////////////////////////
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ScriptLoadContext)
+NS_INTERFACE_MAP_END_INHERITING(JS::loader::LoadContextBase)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(ScriptLoadContext)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ScriptLoadContext,
+                                                JS::loader::LoadContextBase)
+  MOZ_ASSERT(!tmp->mOffThreadToken);
+  MOZ_ASSERT(!tmp->mRunnable);
+  tmp->MaybeUnblockOnload();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ScriptLoadContext,
+                                                  JS::loader::LoadContextBase)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLoadBlockedDocument)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_ADDREF_INHERITED(ScriptLoadContext, JS::loader::LoadContextBase)
+NS_IMPL_RELEASE_INHERITED(ScriptLoadContext, JS::loader::LoadContextBase)
+
+ScriptLoadContext::ScriptLoadContext()
+    : JS::loader::LoadContextBase(JS::loader::ContextKind::Window),
+      mScriptMode(ScriptMode::eBlocking),
+      mScriptFromHead(false),
+      mIsInline(true),
+      mInDeferList(false),
+      mInAsyncList(false),
+      mIsNonAsyncScriptInserted(false),
+      mIsXSLT(false),
+      mInCompilingList(false),
+      mIsTracking(false),
+      mWasCompiledOMT(false),
+      mOffThreadToken(nullptr),
+      mRunnable(nullptr),
+      mLineNo(1),
+      mColumnNo(0),
+      mIsPreload(false),
+      mUnreportedPreloadError(NS_OK) {}
+
+ScriptLoadContext::~ScriptLoadContext() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Off-thread parsing must have completed by this point.
+  MOZ_DIAGNOSTIC_ASSERT(!mOffThreadToken && !mRunnable);
+
+  mRequest = nullptr;
+
+  MaybeUnblockOnload();
+}
+
+void ScriptLoadContext::BlockOnload(Document* aDocument) {
+  MOZ_ASSERT(!mLoadBlockedDocument);
+  aDocument->BlockOnload();
+  mLoadBlockedDocument = aDocument;
+}
+
+void ScriptLoadContext::MaybeUnblockOnload() {
+  if (mLoadBlockedDocument) {
+    mLoadBlockedDocument->UnblockOnload(false);
+    mLoadBlockedDocument = nullptr;
+  }
+}
+
+void ScriptLoadContext::MaybeCancelOffThreadScript() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!mOffThreadToken) {
+    return;
+  }
+
+  // Cancel parse if it hasn't been started yet or wait for it to finish and
+  // clean up finished parse data.
+  JSContext* cx = danger::GetJSContext();
+  JS::CancelOffThreadToken(cx, mOffThreadToken);
+  mOffThreadToken = nullptr;
+
+  // Clear the pointer to the runnable. It may still run later if we didn't
+  // cancel in time. In this case the runnable is held live by the reference
+  // passed to Dispatch, which is dropped after it runs.
+  mRunnable = nullptr;
+
+  MaybeUnblockOnload();
+}
+
+void ScriptLoadContext::SetScriptMode(bool aDeferAttr, bool aAsyncAttr,
+                                      bool aLinkPreload) {
+  if (aLinkPreload) {
+    mScriptMode = ScriptMode::eLinkPreload;
+  } else if (aAsyncAttr) {
+    mScriptMode = ScriptMode::eAsync;
+  } else if (aDeferAttr || mRequest->IsModuleRequest()) {
+    mScriptMode = ScriptMode::eDeferred;
+  } else {
+    mScriptMode = ScriptMode::eBlocking;
+  }
+}
+
+// static
+void ScriptLoadContext::PrioritizeAsPreload(nsIChannel* aChannel) {
+  if (nsCOMPtr<nsIClassOfService> cos = do_QueryInterface(aChannel)) {
+    cos->AddClassFlags(nsIClassOfService::Unblocked);
+  }
+  if (nsCOMPtr<nsISupportsPriority> sp = do_QueryInterface(aChannel)) {
+    sp->AdjustPriority(nsISupportsPriority::PRIORITY_HIGHEST);
+  }
+}
+
+void ScriptLoadContext::PrioritizeAsPreload() {
+  if (!IsLinkPreloadScript()) {
+    // Do the prioritization only if this request has not already been created
+    // as a preload.
+    PrioritizeAsPreload(Channel());
+  }
+}
+
+bool ScriptLoadContext::IsPreload() const {
+  if (mRequest->IsModuleRequest() && !mRequest->IsTopLevel()) {
+    JS::loader::ModuleLoadRequest* root =
+        mRequest->AsModuleRequest()->GetRootModule();
+    return root->GetScriptLoadContext()->IsPreload();
+  }
+
+  MOZ_ASSERT_IF(mIsPreload, !GetScriptElement());
+  return mIsPreload;
+}
+
+bool ScriptLoadContext::CompileStarted() const {
+  return mRequest->IsCompiling() ||
+         (mRequest->IsReadyToRun() && mWasCompiledOMT);
+}
+
+nsIScriptElement* ScriptLoadContext::GetScriptElement() const {
+  nsCOMPtr<nsIScriptElement> scriptElement =
+      do_QueryInterface(mRequest->mFetchOptions->mElement);
+  return scriptElement;
+}
+
+void ScriptLoadContext::SetIsLoadRequest(nsIScriptElement* aElement) {
+  MOZ_ASSERT(aElement);
+  MOZ_ASSERT(!GetScriptElement());
+  MOZ_ASSERT(IsPreload());
+  // We are not tracking our own element, and are relying on the one in
+  // FetchOptions.
+  mRequest->mFetchOptions->mElement = do_QueryInterface(aElement);
+  mIsPreload = false;
+}
+
+void ScriptLoadContext::GetProfilerLabel(nsACString& aOutString) {
+  if (!profiler_is_active()) {
+    aOutString.Append("<script> element");
+    return;
+  }
+  aOutString.Append("<script");
+  if (IsAsyncScript()) {
+    aOutString.Append(" async");
+  } else if (IsDeferredScript()) {
+    aOutString.Append(" defer");
+  }
+  if (mRequest->IsModuleRequest()) {
+    aOutString.Append(" type=\"module\"");
+  }
+
+  nsAutoCString url;
+  if (mRequest->mURI) {
+    mRequest->mURI->GetAsciiSpec(url);
+  } else {
+    url = "<unknown>";
+  }
+
+  if (mIsInline) {
+    if (GetParserCreated() != NOT_FROM_PARSER) {
+      aOutString.Append("> inline at line ");
+      aOutString.AppendInt(mLineNo);
+      aOutString.Append(" of ");
+    } else {
+      aOutString.Append("> inline (dynamically created) in ");
+    }
+    aOutString.Append(url);
+  } else {
+    aOutString.Append(" src=\"");
+    aOutString.Append(url);
+    aOutString.Append("\">");
+  }
+}
+
+}  // namespace mozilla::dom