1 files changed, 80 insertions, 0 deletions
diff --git a/js/src/vm/HelperThreadTask.h b/js/src/vm/HelperThreadTask.h
new file mode 100644
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+++ b/js/src/vm/HelperThreadTask.h
@@ -0,0 +1,80 @@
+/* -*- 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 vm_HelperThreadTask_h
+#define vm_HelperThreadTask_h
+
+#include "js/Utility.h"
+
+namespace js {
+
+class AutoLockHelperThreadState;
+struct ParseTask;
+struct DelazifyTask;
+struct FreeDelazifyTask;
+class SourceCompressionTask;
+
+namespace jit {
+class IonCompileTask;
+class IonFreeTask;
+}  // namespace jit
+namespace wasm {
+struct Tier2GeneratorTask;
+}  // namespace wasm
+
+template <typename T>
+struct MapTypeToThreadType {};
+
+template <>
+struct MapTypeToThreadType<jit::IonCompileTask> {
+  static const ThreadType threadType = THREAD_TYPE_ION;
+};
+
+template <>
+struct MapTypeToThreadType<wasm::Tier2GeneratorTask> {
+  static const ThreadType threadType = THREAD_TYPE_WASM_GENERATOR_TIER2;
+};
+
+template <>
+struct MapTypeToThreadType<ParseTask> {
+  static const ThreadType threadType = THREAD_TYPE_PARSE;
+};
+
+template <>
+struct MapTypeToThreadType<DelazifyTask> {
+  static const ThreadType threadType = THREAD_TYPE_DELAZIFY;
+};
+
+template <>
+struct MapTypeToThreadType<FreeDelazifyTask> {
+  static const ThreadType threadType = THREAD_TYPE_DELAZIFY_FREE;
+};
+
+template <>
+struct MapTypeToThreadType<SourceCompressionTask> {
+  static const ThreadType threadType = THREAD_TYPE_COMPRESS;
+};
+
+struct HelperThreadTask {
+  virtual void runHelperThreadTask(AutoLockHelperThreadState& locked) = 0;
+  virtual ThreadType threadType() = 0;
+  virtual ~HelperThreadTask() = default;
+
+  template <typename T>
+  bool is() {
+    return MapTypeToThreadType<T>::threadType == threadType();
+  }
+
+  template <typename T>
+  T* as() {
+    MOZ_ASSERT(this->is<T>());
+    return static_cast<T*>(this);
+  }
+};
+
+}  // namespace js
+
+#endif /* vm_HelperThreadTask_h */