1 files changed, 62 insertions, 0 deletions
diff --git a/dom/workers/JSSettings.h b/dom/workers/JSSettings.h
new file mode 100644
index 0000000000..af2247a847
--- /dev/null
+++ b/dom/workers/JSSettings.h
@@ -0,0 +1,62 @@
+/* -*- 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_workerinternals_JSSettings_h
+#define mozilla_dom_workerinternals_JSSettings_h
+
+#include <stdint.h>
+
+#include "js/ContextOptions.h"
+#include "js/GCAPI.h"
+#include "js/RealmOptions.h"
+#include "mozilla/Maybe.h"
+#include "nsString.h"
+#include "nsTArray.h"
+
+namespace mozilla::dom::workerinternals {
+
+// Random unique constant to facilitate JSPrincipal debugging
+const uint32_t kJSPrincipalsDebugToken = 0x7e2df9d2;
+
+struct JSSettings {
+  struct JSGCSetting {
+    JSGCParamKey key;
+    // Nothing() represents the default value, the result of calling
+    // JS_ResetGCParameter.
+    Maybe<uint32_t> value;
+
+    // For the IndexOf call below.
+    bool operator==(JSGCParamKey k) const { return key == k; }
+  };
+
+  JS::RealmOptions chromeRealmOptions;
+  JS::RealmOptions contentRealmOptions;
+  CopyableTArray<JSGCSetting> gcSettings;
+  JS::ContextOptions contextOptions;
+
+#ifdef JS_GC_ZEAL
+  uint8_t gcZeal = 0;
+  uint32_t gcZealFrequency = 0;
+#endif
+
+  // Returns whether there was a change in the setting.
+  bool ApplyGCSetting(JSGCParamKey aKey, Maybe<uint32_t> aValue) {
+    size_t index = gcSettings.IndexOf(aKey);
+    if (index == gcSettings.NoIndex) {
+      gcSettings.AppendElement(JSGCSetting{aKey, aValue});
+      return true;
+    }
+    if (gcSettings[index].value != aValue) {
+      gcSettings[index].value = aValue;
+      return true;
+    }
+    return false;
+  }
+};
+
+}  // namespace mozilla::dom::workerinternals
+
+#endif  // mozilla_dom_workerinternals_JSSettings_h