--- /dev/null
+/* Copyright 2018 SiFive, Inc */
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#ifndef METAL__COMPILER_H
+#define METAL__COMPILER_H
+
+#define __METAL_DECLARE_VTABLE(type) \
+ extern const struct type type;
+
+#define __METAL_DEFINE_VTABLE(type) \
+ const struct type type
+
+#define __METAL_GET_FIELD(reg, mask) \
+ (((reg) & (mask)) / ((mask) & ~((mask) << 1)))
+
+/* Set field with mask for a given value */
+#define __METAL_SET_FIELD(reg, mask, val) \
+ (((reg) & ~(mask)) | (((val) * ((mask) & ~((mask) << 1))) & (mask)))
+
+void _metal_trap(int ecode);
+
+#endif