1 files changed, 65 insertions, 0 deletions
diff --git a/js/src/builtin/temporal/PlainYearMonth.h b/js/src/builtin/temporal/PlainYearMonth.h
new file mode 100644
index 0000000000..e9adda9b08
--- /dev/null
+++ b/js/src/builtin/temporal/PlainYearMonth.h
@@ -0,0 +1,65 @@
+/* -*- 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_temporal_PlainYearMonth_h
+#define builtin_temporal_PlainYearMonth_h
+
+#include <stdint.h>
+
+#include "builtin/temporal/Calendar.h"
+#include "builtin/temporal/TemporalTypes.h"
+#include "js/TypeDecls.h"
+#include "js/Value.h"
+#include "vm/NativeObject.h"
+
+namespace js {
+struct ClassSpec;
+}
+
+namespace js::temporal {
+
+class PlainYearMonthObject : public NativeObject {
+ public:
+  static const JSClass class_;
+  static const JSClass& protoClass_;
+
+  static constexpr uint32_t ISO_YEAR_SLOT = 0;
+  static constexpr uint32_t ISO_MONTH_SLOT = 1;
+  static constexpr uint32_t ISO_DAY_SLOT = 2;
+  static constexpr uint32_t CALENDAR_SLOT = 3;
+  static constexpr uint32_t SLOT_COUNT = 4;
+
+  int32_t isoYear() const { return getFixedSlot(ISO_YEAR_SLOT).toInt32(); }
+
+  int32_t isoMonth() const { return getFixedSlot(ISO_MONTH_SLOT).toInt32(); }
+
+  int32_t isoDay() const { return getFixedSlot(ISO_DAY_SLOT).toInt32(); }
+
+  CalendarValue calendar() const {
+    return CalendarValue(getFixedSlot(CALENDAR_SLOT));
+  }
+
+ private:
+  static const ClassSpec classSpec_;
+};
+
+/**
+ * Extract the date fields from the PlainYearMonth object.
+ */
+inline PlainDate ToPlainDate(const PlainYearMonthObject* yearMonth) {
+  return {yearMonth->isoYear(), yearMonth->isoMonth(), yearMonth->isoDay()};
+}
+
+/**
+ * CreateTemporalYearMonth ( isoYear, isoMonth, calendar, referenceISODay [ ,
+ * newTarget ] )
+ */
+PlainYearMonthObject* CreateTemporalYearMonth(
+    JSContext* cx, const PlainDate& date, JS::Handle<CalendarValue> calendar);
+
+} /* namespace js::temporal */
+
+#endif /* builtin_temporal_PlainYearMonth_h */