Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 205 insertions, 0 deletions

diff --git a/js/loader/LoadedScript.cpp b/js/loader/LoadedScript.cpp
new file mode 100644
index 0000000000..dfdda337b9
--- /dev/null
+++ b/js/loader/LoadedScript.cpp
@@ -0,0 +1,205 @@
+/* -*- 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 "LoadedScript.h"
+
+#include "mozilla/HoldDropJSObjects.h"
+
+#include "jsfriendapi.h"
+#include "js/Modules.h"  // JS::{Get,Set}ModulePrivate
+
+namespace JS::loader {
+
+//////////////////////////////////////////////////////////////
+// LoadedScript
+//////////////////////////////////////////////////////////////
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LoadedScript)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(LoadedScript)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(LoadedScript)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchOptions)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(LoadedScript)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchOptions)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(LoadedScript)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(LoadedScript)
+
+LoadedScript::LoadedScript(ScriptKind aKind, ScriptFetchOptions* aFetchOptions,
+                           nsIURI* aBaseURL)
+    : mKind(aKind), mFetchOptions(aFetchOptions), mBaseURL(aBaseURL) {
+  MOZ_ASSERT(mFetchOptions);
+  MOZ_ASSERT(mBaseURL);
+}
+
+LoadedScript::~LoadedScript() { mozilla::DropJSObjects(this); }
+
+void LoadedScript::AssociateWithScript(JSScript* aScript) {
+  // Set a JSScript's private value to point to this object. The JS engine will
+  // increment our reference count by calling HostAddRefTopLevelScript(). This
+  // is decremented by HostReleaseTopLevelScript() below when the JSScript dies.
+
+  MOZ_ASSERT(JS::GetScriptPrivate(aScript).isUndefined());
+  JS::SetScriptPrivate(aScript, JS::PrivateValue(this));
+}
+
+inline void CheckModuleScriptPrivate(LoadedScript* script,
+                                     const JS::Value& aPrivate) {
+#ifdef DEBUG
+  if (script->IsModuleScript()) {
+    JSObject* module = script->AsModuleScript()->mModuleRecord.unbarrieredGet();
+    MOZ_ASSERT_IF(module, JS::GetModulePrivate(module) == aPrivate);
+  }
+#endif
+}
+
+void HostAddRefTopLevelScript(const JS::Value& aPrivate) {
+  // Increment the reference count of a LoadedScript object that is now pointed
+  // to by a JSScript. The reference count is decremented by
+  // HostReleaseTopLevelScript() below.
+
+  auto script = static_cast<LoadedScript*>(aPrivate.toPrivate());
+  CheckModuleScriptPrivate(script, aPrivate);
+  script->AddRef();
+}
+
+void HostReleaseTopLevelScript(const JS::Value& aPrivate) {
+  // Decrement the reference count of a LoadedScript object that was pointed to
+  // by a JSScript. The reference count was originally incremented by
+  // HostAddRefTopLevelScript() above.
+
+  auto script = static_cast<LoadedScript*>(aPrivate.toPrivate());
+  CheckModuleScriptPrivate(script, aPrivate);
+  script->Release();
+}
+
+//////////////////////////////////////////////////////////////
+// EventScript
+//////////////////////////////////////////////////////////////
+
+EventScript::EventScript(ScriptFetchOptions* aFetchOptions, nsIURI* aBaseURL)
+    : LoadedScript(ScriptKind::eEvent, aFetchOptions, aBaseURL) {}
+
+//////////////////////////////////////////////////////////////
+// ClassicScript
+//////////////////////////////////////////////////////////////
+
+ClassicScript::ClassicScript(ScriptFetchOptions* aFetchOptions,
+                             nsIURI* aBaseURL)
+    : LoadedScript(ScriptKind::eClassic, aFetchOptions, aBaseURL) {}
+
+//////////////////////////////////////////////////////////////
+// ModuleScript
+//////////////////////////////////////////////////////////////
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(ModuleScript, LoadedScript)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleScript)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ModuleScript, LoadedScript)
+  tmp->UnlinkModuleRecord();
+  tmp->mParseError.setUndefined();
+  tmp->mErrorToRethrow.setUndefined();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ModuleScript, LoadedScript)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(ModuleScript, LoadedScript)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mParseError)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mErrorToRethrow)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+ModuleScript::ModuleScript(ScriptFetchOptions* aFetchOptions, nsIURI* aBaseURL)
+    : LoadedScript(ScriptKind::eModule, aFetchOptions, aBaseURL),
+      mDebuggerDataInitialized(false) {
+  MOZ_ASSERT(!ModuleRecord());
+  MOZ_ASSERT(!HasParseError());
+  MOZ_ASSERT(!HasErrorToRethrow());
+}
+
+void ModuleScript::Shutdown() {
+  if (mModuleRecord) {
+    JS::ClearModuleEnvironment(mModuleRecord);
+  }
+
+  UnlinkModuleRecord();
+}
+
+void ModuleScript::UnlinkModuleRecord() {
+  // Remove the module record's pointer to this object if present and decrement
+  // our reference count. The reference is added by SetModuleRecord() below.
+  //
+  // This takes care not to trigger gray unmarking because this takes a lot of
+  // time when we're tearing down the entire page. This is safe because we are
+  // only writing undefined into the module private, so it won't create any
+  // black-gray edges.
+  if (mModuleRecord) {
+    JSObject* module = mModuleRecord.unbarrieredGet();
+    MOZ_ASSERT(JS::GetModulePrivate(module).toPrivate() == this);
+    JS::ClearModulePrivate(module);
+    mModuleRecord = nullptr;
+  }
+}
+
+ModuleScript::~ModuleScript() {
+  // The object may be destroyed without being unlinked first.
+  UnlinkModuleRecord();
+}
+
+void ModuleScript::SetModuleRecord(JS::Handle<JSObject*> aModuleRecord) {
+  MOZ_ASSERT(!mModuleRecord);
+  MOZ_ASSERT_IF(IsModuleScript(), !AsModuleScript()->HasParseError());
+  MOZ_ASSERT_IF(IsModuleScript(), !AsModuleScript()->HasErrorToRethrow());
+
+  mModuleRecord = aModuleRecord;
+
+  // Make module's host defined field point to this object. The JS engine will
+  // increment our reference count by calling HostAddRefTopLevelScript(). This
+  // is decremented when the field is cleared in UnlinkModuleRecord() above or
+  // when the module record dies.
+  MOZ_ASSERT(JS::GetModulePrivate(mModuleRecord).isUndefined());
+  JS::SetModulePrivate(mModuleRecord, JS::PrivateValue(this));
+
+  mozilla::HoldJSObjects(this);
+}
+
+void ModuleScript::SetParseError(const JS::Value& aError) {
+  MOZ_ASSERT(!aError.isUndefined());
+  MOZ_ASSERT(!HasParseError());
+  MOZ_ASSERT(!HasErrorToRethrow());
+
+  UnlinkModuleRecord();
+  mParseError = aError;
+  mozilla::HoldJSObjects(this);
+}
+
+void ModuleScript::SetErrorToRethrow(const JS::Value& aError) {
+  MOZ_ASSERT(!aError.isUndefined());
+
+  // This is only called after SetModuleRecord() or SetParseError() so we don't
+  // need to call HoldJSObjects() here.
+  MOZ_ASSERT(ModuleRecord() || HasParseError());
+
+  mErrorToRethrow = aError;
+}
+
+void ModuleScript::SetDebuggerDataInitialized() {
+  MOZ_ASSERT(ModuleRecord());
+  MOZ_ASSERT(!mDebuggerDataInitialized);
+
+  mDebuggerDataInitialized = true;
+}
+
+}  // namespace JS::loader