1 files changed, 69 insertions, 0 deletions
diff --git a/dom/ipc/JSOracleChild.h b/dom/ipc/JSOracleChild.h
new file mode 100644
index 0000000000..f62ef7134c
--- /dev/null
+++ b/dom/ipc/JSOracleChild.h
@@ -0,0 +1,69 @@
+/* -*- 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 mozilla_dom_JSOracleChild
+#define mozilla_dom_JSOracleChild
+
+#include "mozilla/dom/PJSOracleChild.h"
+
+#include "js/experimental/JSStencil.h"
+#include "js/experimental/CompileScript.h"
+#include "js/Initialization.h"
+#include "jsapi.h"
+
+namespace mozilla::ipc {
+class UtilityProcessParent;
+}
+
+namespace mozilla::dom {
+struct JSFrontendContextHolder {
+  JSFrontendContextHolder() {
+    MOZ_RELEASE_ASSERT(JS_IsInitialized(),
+                       "UtilityProcessChild::Init should have JS initialized");
+
+    mFc = JS::NewFrontendContext();
+    if (!mFc) {
+      MOZ_CRASH("Failed to create JS FrontendContext");
+      return;
+    }
+
+    // See the comment in XPCJSContext::Initialize.
+    const size_t kDefaultStackQuota = 128 * sizeof(size_t) * 1024;
+
+    JS::SetNativeStackQuota(mFc, kDefaultStackQuota);
+  }
+
+  ~JSFrontendContextHolder() {
+    if (mFc) {
+      JS::DestroyFrontendContext(mFc);
+    }
+  }
+
+  static void MaybeInit();
+
+  JS::FrontendContext* mFc;
+};
+
+class PJSValidatorChild;
+
+class JSOracleChild final : public PJSOracleChild {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(JSOracleChild, override);
+
+  already_AddRefed<PJSValidatorChild> AllocPJSValidatorChild();
+
+  void Start(Endpoint<PJSOracleChild>&& aEndpoint);
+
+  static JS::FrontendContext* JSFrontendContext();
+
+ private:
+  ~JSOracleChild() = default;
+
+  static JSOracleChild* GetSingleton();
+};
+}  // namespace mozilla::dom
+
+#endif  // defined(mozilla_dom_JSOracleChild)