1 files changed, 374 insertions, 0 deletions
diff --git a/js/xpconnect/loader/ChromeScriptLoader.cpp b/js/xpconnect/loader/ChromeScriptLoader.cpp
new file mode 100644
index 0000000000..210dd8ffd4
--- /dev/null
+++ b/js/xpconnect/loader/ChromeScriptLoader.cpp
@@ -0,0 +1,374 @@
+/* -*- 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 "PrecompiledScript.h"
+
+#include "nsIIncrementalStreamLoader.h"
+#include "nsIURI.h"
+#include "nsIChannel.h"
+#include "nsNetUtil.h"
+#include "nsThreadUtils.h"
+
+#include "jsapi.h"
+#include "jsfriendapi.h"
+#include "js/CompilationAndEvaluation.h"
+#include "js/SourceText.h"
+#include "js/Utility.h"
+
+#include "mozilla/Attributes.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/dom/ChromeUtils.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/ScriptLoader.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "nsCCUncollectableMarker.h"
+#include "nsCycleCollectionParticipant.h"
+
+using namespace JS;
+using namespace mozilla;
+using namespace mozilla::dom;
+
+class AsyncScriptCompiler final : public nsIIncrementalStreamLoaderObserver,
+                                  public Runnable {
+ public:
+  // Note: References to this class are never held by cycle-collected objects.
+  // If at any point a reference is returned to a caller, please update this
+  // class to implement cycle collection.
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIINCREMENTALSTREAMLOADEROBSERVER
+  NS_DECL_NSIRUNNABLE
+
+  AsyncScriptCompiler(JSContext* aCx, nsIGlobalObject* aGlobal,
+                      const nsACString& aURL, Promise* aPromise)
+      : mozilla::Runnable("AsyncScriptCompiler"),
+        mOptions(aCx),
+        mURL(aURL),
+        mGlobalObject(aGlobal),
+        mPromise(aPromise),
+        mToken(nullptr),
+        mScriptLength(0) {}
+
+  MOZ_MUST_USE nsresult Start(JSContext* aCx,
+                              const CompileScriptOptionsDictionary& aOptions,
+                              nsIPrincipal* aPrincipal);
+
+  inline void SetToken(JS::OffThreadToken* aToken) { mToken = aToken; }
+
+ protected:
+  virtual ~AsyncScriptCompiler() {
+    if (mPromise->State() == Promise::PromiseState::Pending) {
+      mPromise->MaybeReject(NS_ERROR_FAILURE);
+    }
+  }
+
+ private:
+  void Reject(JSContext* aCx);
+  void Reject(JSContext* aCx, const char* aMxg);
+
+  bool StartCompile(JSContext* aCx);
+  void FinishCompile(JSContext* aCx);
+  void Finish(JSContext* aCx, Handle<JSScript*> script);
+
+  OwningCompileOptions mOptions;
+  nsCString mURL;
+  nsCOMPtr<nsIGlobalObject> mGlobalObject;
+  RefPtr<Promise> mPromise;
+  nsString mCharset;
+  JS::OffThreadToken* mToken;
+  UniqueTwoByteChars mScriptText;
+  size_t mScriptLength;
+};
+
+NS_IMPL_QUERY_INTERFACE_INHERITED(AsyncScriptCompiler, Runnable,
+                                  nsIIncrementalStreamLoaderObserver)
+NS_IMPL_ADDREF_INHERITED(AsyncScriptCompiler, Runnable)
+NS_IMPL_RELEASE_INHERITED(AsyncScriptCompiler, Runnable)
+
+nsresult AsyncScriptCompiler::Start(
+    JSContext* aCx, const CompileScriptOptionsDictionary& aOptions,
+    nsIPrincipal* aPrincipal) {
+  mCharset = aOptions.mCharset;
+
+  CompileOptions options(aCx);
+  options.setFile(mURL.get()).setNoScriptRval(!aOptions.mHasReturnValue);
+
+  if (!aOptions.mLazilyParse) {
+    options.setForceFullParse();
+  }
+
+  if (NS_WARN_IF(!mOptions.copy(aCx, options))) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), mURL);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIChannel> channel;
+  rv = NS_NewChannel(
+      getter_AddRefs(channel), uri, aPrincipal,
+      nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL,
+      nsIContentPolicy::TYPE_INTERNAL_CHROMEUTILS_COMPILED_SCRIPT);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // allow deprecated HTTP request from SystemPrincipal
+  nsCOMPtr<nsILoadInfo> loadInfo = channel->LoadInfo();
+  loadInfo->SetAllowDeprecatedSystemRequests(true);
+  nsCOMPtr<nsIIncrementalStreamLoader> loader;
+  rv = NS_NewIncrementalStreamLoader(getter_AddRefs(loader), this);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return channel->AsyncOpen(loader);
+}
+
+static void OffThreadScriptLoaderCallback(JS::OffThreadToken* aToken,
+                                          void* aCallbackData) {
+  RefPtr<AsyncScriptCompiler> scriptCompiler =
+      dont_AddRef(static_cast<AsyncScriptCompiler*>(aCallbackData));
+
+  scriptCompiler->SetToken(aToken);
+
+  SchedulerGroup::Dispatch(TaskCategory::Other, scriptCompiler.forget());
+}
+
+bool AsyncScriptCompiler::StartCompile(JSContext* aCx) {
+  Rooted<JSObject*> global(aCx, mGlobalObject->GetGlobalJSObject());
+
+  JS::SourceText<char16_t> srcBuf;
+  if (!srcBuf.init(aCx, std::move(mScriptText), mScriptLength)) {
+    return false;
+  }
+
+  if (JS::CanCompileOffThread(aCx, mOptions, mScriptLength)) {
+    if (!JS::CompileOffThread(aCx, mOptions, srcBuf,
+                              OffThreadScriptLoaderCallback,
+                              static_cast<void*>(this))) {
+      return false;
+    }
+
+    NS_ADDREF(this);
+    return true;
+  }
+
+  Rooted<JSScript*> script(aCx, JS::Compile(aCx, mOptions, srcBuf));
+  if (!script) {
+    return false;
+  }
+
+  Finish(aCx, script);
+  return true;
+}
+
+NS_IMETHODIMP
+AsyncScriptCompiler::Run() {
+  AutoJSAPI jsapi;
+  if (jsapi.Init(mGlobalObject)) {
+    FinishCompile(jsapi.cx());
+  } else {
+    jsapi.Init();
+    JS::CancelOffThreadScript(jsapi.cx(), mToken);
+
+    mPromise->MaybeReject(NS_ERROR_FAILURE);
+  }
+
+  return NS_OK;
+}
+
+void AsyncScriptCompiler::FinishCompile(JSContext* aCx) {
+  Rooted<JSScript*> script(aCx, JS::FinishOffThreadScript(aCx, mToken));
+  if (script) {
+    Finish(aCx, script);
+  } else {
+    Reject(aCx);
+  }
+}
+
+void AsyncScriptCompiler::Finish(JSContext* aCx, Handle<JSScript*> aScript) {
+  RefPtr<PrecompiledScript> result =
+      new PrecompiledScript(mGlobalObject, aScript, mOptions);
+
+  mPromise->MaybeResolve(result);
+}
+
+void AsyncScriptCompiler::Reject(JSContext* aCx) {
+  RootedValue value(aCx, JS::UndefinedValue());
+  if (JS_GetPendingException(aCx, &value)) {
+    JS_ClearPendingException(aCx);
+  }
+  mPromise->MaybeReject(value);
+}
+
+void AsyncScriptCompiler::Reject(JSContext* aCx, const char* aMsg) {
+  nsAutoString msg;
+  msg.AppendASCII(aMsg);
+  msg.AppendLiteral(": ");
+  AppendUTF8toUTF16(mURL, msg);
+
+  RootedValue exn(aCx);
+  if (xpc::NonVoidStringToJsval(aCx, msg, &exn)) {
+    JS_SetPendingException(aCx, exn);
+  }
+
+  Reject(aCx);
+}
+
+NS_IMETHODIMP
+AsyncScriptCompiler::OnIncrementalData(nsIIncrementalStreamLoader* aLoader,
+                                       nsISupports* aContext,
+                                       uint32_t aDataLength,
+                                       const uint8_t* aData,
+                                       uint32_t* aConsumedData) {
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+AsyncScriptCompiler::OnStreamComplete(nsIIncrementalStreamLoader* aLoader,
+                                      nsISupports* aContext, nsresult aStatus,
+                                      uint32_t aLength, const uint8_t* aBuf) {
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(mGlobalObject)) {
+    mPromise->MaybeReject(NS_ERROR_FAILURE);
+    return NS_OK;
+  }
+
+  JSContext* cx = jsapi.cx();
+
+  if (NS_FAILED(aStatus)) {
+    Reject(cx, "Unable to load script");
+    return NS_OK;
+  }
+
+  nsresult rv = ScriptLoader::ConvertToUTF16(
+      nullptr, aBuf, aLength, mCharset, nullptr, mScriptText, mScriptLength);
+  if (NS_FAILED(rv)) {
+    Reject(cx, "Unable to decode script");
+    return NS_OK;
+  }
+
+  if (!StartCompile(cx)) {
+    Reject(cx);
+  }
+
+  return NS_OK;
+}
+
+namespace mozilla {
+namespace dom {
+
+/* static */
+already_AddRefed<Promise> ChromeUtils::CompileScript(
+    GlobalObject& aGlobal, const nsAString& aURL,
+    const CompileScriptOptionsDictionary& aOptions, ErrorResult& aRv) {
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  MOZ_ASSERT(global);
+
+  RefPtr<Promise> promise = Promise::Create(global, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  NS_ConvertUTF16toUTF8 url(aURL);
+  RefPtr<AsyncScriptCompiler> compiler =
+      new AsyncScriptCompiler(aGlobal.Context(), global, url, promise);
+
+  nsresult rv = compiler->Start(aGlobal.Context(), aOptions,
+                                aGlobal.GetSubjectPrincipal());
+  if (NS_FAILED(rv)) {
+    promise->MaybeReject(rv);
+  }
+
+  return promise.forget();
+}
+
+PrecompiledScript::PrecompiledScript(nsISupports* aParent,
+                                     Handle<JSScript*> aScript,
+                                     JS::ReadOnlyCompileOptions& aOptions)
+    : mParent(aParent),
+      mScript(aScript),
+      mURL(aOptions.filename()),
+      mHasReturnValue(!aOptions.noScriptRval) {
+  MOZ_ASSERT(aParent);
+  MOZ_ASSERT(aScript);
+
+  mozilla::HoldJSObjects(this);
+};
+
+PrecompiledScript::~PrecompiledScript() { mozilla::DropJSObjects(this); }
+
+void PrecompiledScript::ExecuteInGlobal(JSContext* aCx, HandleObject aGlobal,
+                                        MutableHandleValue aRval,
+                                        ErrorResult& aRv) {
+  {
+    RootedObject targetObj(aCx, JS_FindCompilationScope(aCx, aGlobal));
+    JSAutoRealm ar(aCx, targetObj);
+
+    Rooted<JSScript*> script(aCx, mScript);
+    if (!JS::CloneAndExecuteScript(aCx, script, aRval)) {
+      aRv.NoteJSContextException(aCx);
+      return;
+    }
+  }
+
+  JS_WrapValue(aCx, aRval);
+}
+
+void PrecompiledScript::GetUrl(nsAString& aUrl) { CopyUTF8toUTF16(mURL, aUrl); }
+
+bool PrecompiledScript::HasReturnValue() { return mHasReturnValue; }
+
+JSObject* PrecompiledScript::WrapObject(JSContext* aCx,
+                                        HandleObject aGivenProto) {
+  return PrecompiledScript_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+bool PrecompiledScript::IsBlackForCC(bool aTracingNeeded) {
+  return (nsCCUncollectableMarker::sGeneration && HasKnownLiveWrapper() &&
+          (!aTracingNeeded || HasNothingToTrace(this)));
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(PrecompiledScript)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PrecompiledScript)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(PrecompiledScript)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+
+  tmp->mScript = nullptr;
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(PrecompiledScript)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(PrecompiledScript)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mScript)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(PrecompiledScript)
+  if (tmp->IsBlackForCC(false)) {
+    tmp->mScript.exposeToActiveJS();
+    return true;
+  }
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(PrecompiledScript)
+  return tmp->IsBlackForCC(true);
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
+
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(PrecompiledScript)
+  return tmp->IsBlackForCC(false);
+NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(PrecompiledScript)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(PrecompiledScript)
+
+}  // namespace dom
+}  // namespace mozilla