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diff --git a/circuitpython/py/emitglue.h b/circuitpython/py/emitglue.h
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#ifndef MICROPY_INCLUDED_PY_EMITGLUE_H
+#define MICROPY_INCLUDED_PY_EMITGLUE_H
+
+#include "py/obj.h"
+#include "py/bc.h"
+
+// These variables and functions glue the code emitters to the runtime.
+
+// These must fit in 8 bits; see scope.h
+enum {
+    MP_EMIT_OPT_NONE,
+    MP_EMIT_OPT_BYTECODE,
+    MP_EMIT_OPT_NATIVE_PYTHON,
+    MP_EMIT_OPT_VIPER,
+    MP_EMIT_OPT_ASM,
+};
+
+typedef enum {
+    MP_CODE_UNUSED,
+    MP_CODE_RESERVED,
+    MP_CODE_BYTECODE,
+    MP_CODE_NATIVE_PY,
+    MP_CODE_NATIVE_VIPER,
+    MP_CODE_NATIVE_ASM,
+} mp_raw_code_kind_t;
+
+typedef struct _mp_qstr_link_entry_t {
+    uint16_t off;
+    uint16_t qst;
+} mp_qstr_link_entry_t;
+
+typedef struct _mp_raw_code_t {
+    uint8_t kind; // of type mp_raw_code_kind_t
+    uint8_t scope_flags;
+    uint16_t n_pos_args;
+    const void *fun_data;
+    const mp_uint_t *const_table;
+    #if MICROPY_PERSISTENT_CODE_SAVE
+    size_t fun_data_len;
+    uint16_t n_obj;
+    uint16_t n_raw_code;
+    #if MICROPY_PY_SYS_SETTRACE
+    mp_bytecode_prelude_t prelude;
+    // line_of_definition is a Python source line where the raw_code was
+    // created e.g. MP_BC_MAKE_FUNCTION. This is different from lineno info
+    // stored in prelude, which provides line number for first statement of
+    // a function. Required to properly implement "call" trace event.
+    mp_uint_t line_of_definition;
+    #endif
+    #if MICROPY_EMIT_MACHINE_CODE
+    uint16_t prelude_offset;
+    uint16_t n_qstr;
+    mp_qstr_link_entry_t *qstr_link;
+    #endif
+    #endif
+    #if MICROPY_EMIT_MACHINE_CODE
+    mp_uint_t type_sig; // for viper, compressed as 2-bit types; ret is MSB, then arg0, arg1, etc
+    #endif
+} mp_raw_code_t;
+
+mp_raw_code_t *mp_emit_glue_new_raw_code(void);
+
+void mp_emit_glue_assign_bytecode(mp_raw_code_t *rc, const byte *code,
+    #if MICROPY_PERSISTENT_CODE_SAVE || MICROPY_DEBUG_PRINTERS
+    size_t len,
+    #endif
+    const mp_uint_t *const_table,
+    #if MICROPY_PERSISTENT_CODE_SAVE
+    uint16_t n_obj, uint16_t n_raw_code,
+    #endif
+    mp_uint_t scope_flags);
+
+void mp_emit_glue_assign_native(mp_raw_code_t *rc, mp_raw_code_kind_t kind, void *fun_data, mp_uint_t fun_len,
+    const mp_uint_t *const_table,
+    #if MICROPY_PERSISTENT_CODE_SAVE
+    uint16_t prelude_offset,
+    uint16_t n_obj, uint16_t n_raw_code,
+    uint16_t n_qstr, mp_qstr_link_entry_t *qstr_link,
+    #endif
+    mp_uint_t n_pos_args, mp_uint_t scope_flags, mp_uint_t type_sig);
+
+mp_obj_t mp_make_function_from_raw_code(const mp_raw_code_t *rc, mp_obj_t def_args, mp_obj_t def_kw_args);
+mp_obj_t mp_make_closure_from_raw_code(const mp_raw_code_t *rc, mp_uint_t n_closed_over, const mp_obj_t *args);
+
+#endif // MICROPY_INCLUDED_PY_EMITGLUE_H