1 files changed, 79 insertions, 0 deletions
diff --git a/js/src/builtin/intl/DisplayNames.h b/js/src/builtin/intl/DisplayNames.h
new file mode 100644
index 0000000000..9fd6c63a62
--- /dev/null
+++ b/js/src/builtin/intl/DisplayNames.h
@@ -0,0 +1,79 @@
+/* -*- 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 builtin_intl_DisplayNames_h
+#define builtin_intl_DisplayNames_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "jstypes.h"
+#include "NamespaceImports.h"
+
+#include "builtin/SelfHostingDefines.h"
+#include "js/Class.h"  // JSClass, JSClassOps, js::ClassSpec
+#include "js/TypeDecls.h"
+#include "js/Value.h"
+#include "vm/NativeObject.h"
+
+struct JS_PUBLIC_API JSContext;
+
+namespace mozilla::intl {
+class DisplayNames;
+}
+
+namespace js {
+struct ClassSpec;
+
+class DisplayNamesObject : public NativeObject {
+ public:
+  static const JSClass class_;
+  static const JSClass& protoClass_;
+
+  static constexpr uint32_t INTERNALS_SLOT = 0;
+  static constexpr uint32_t LOCALE_DISPLAY_NAMES_SLOT = 1;
+  static constexpr uint32_t SLOT_COUNT = 3;
+
+  static_assert(INTERNALS_SLOT == INTL_INTERNALS_OBJECT_SLOT,
+                "INTERNALS_SLOT must match self-hosting define for internals "
+                "object slot");
+
+  // Estimated memory use for ULocaleDisplayNames (see IcuMemoryUsage).
+  static constexpr size_t EstimatedMemoryUse = 1238;
+
+  mozilla::intl::DisplayNames* getDisplayNames() const {
+    const auto& slot = getFixedSlot(LOCALE_DISPLAY_NAMES_SLOT);
+    if (slot.isUndefined()) {
+      return nullptr;
+    }
+    return static_cast<mozilla::intl::DisplayNames*>(slot.toPrivate());
+  }
+
+  void setDisplayNames(mozilla::intl::DisplayNames* displayNames) {
+    setFixedSlot(LOCALE_DISPLAY_NAMES_SLOT, PrivateValue(displayNames));
+  }
+
+ private:
+  static const JSClassOps classOps_;
+  static const ClassSpec classSpec_;
+
+  static void finalize(JS::GCContext* gcx, JSObject* obj);
+};
+
+/**
+ * Return the display name for the requested code or undefined if no applicable
+ * display name was found.
+ *
+ * Usage: result = intl_ComputeDisplayName(displayNames, locale, calendar,
+ *                                         style, languageDisplay, fallback,
+ *                                         type, code)
+ */
+[[nodiscard]] extern bool intl_ComputeDisplayName(JSContext* cx, unsigned argc,
+                                                  Value* vp);
+
+}  // namespace js
+
+#endif /* builtin_intl_DisplayNames_h */