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https://github.com/licsber/micropython.git
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1831034be1
This patch refactors the error handling in the lexer, to simplify it (ie reduce code size). A long time ago, when the lexer/parser/compiler were first written, the lexer and parser were designed so they didn't use exceptions (ie nlr) to report errors but rather returned an error code. Over time that has gradually changed, the parser in particular has more and more ways of raising exceptions. Also, the lexer never really handled all errors without raising, eg there were some memory errors which could raise an exception (and in these rare cases one would get a fatal nlr-not-handled fault). This patch accepts the fact that the lexer can raise exceptions in some cases and allows it to raise exceptions to handle all its errors, which are for the most part just out-of-memory errors during construction of the lexer. This makes the lexer a bit simpler, and also the persistent code stuff is simplified. What this means for users of the lexer is that calls to it must be wrapped in a nlr handler. But all uses of the lexer already have such an nlr handler for the parser (and compiler) so that doesn't put any extra burden on the callers.
399 lines
12 KiB
C
399 lines
12 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013-2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "py/reader.h"
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#include "py/emitglue.h"
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#include "py/persistentcode.h"
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#include "py/bc.h"
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#if MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
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#include "py/smallint.h"
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// The current version of .mpy files
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#define MPY_VERSION (1)
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// The feature flags byte encodes the compile-time config options that
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// affect the generate bytecode.
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#define MPY_FEATURE_FLAGS ( \
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((MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE) << 0) \
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| ((MICROPY_PY_BUILTINS_STR_UNICODE) << 1) \
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)
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// This is a version of the flags that can be configured at runtime.
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#define MPY_FEATURE_FLAGS_DYNAMIC ( \
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((MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE_DYNAMIC) << 0) \
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| ((MICROPY_PY_BUILTINS_STR_UNICODE_DYNAMIC) << 1) \
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)
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#if MICROPY_PERSISTENT_CODE_LOAD || (MICROPY_PERSISTENT_CODE_SAVE && !MICROPY_DYNAMIC_COMPILER)
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// The bytecode will depend on the number of bits in a small-int, and
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// this function computes that (could make it a fixed constant, but it
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// would need to be defined in mpconfigport.h).
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STATIC int mp_small_int_bits(void) {
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mp_int_t i = MP_SMALL_INT_MAX;
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int n = 1;
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while (i != 0) {
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i >>= 1;
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++n;
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}
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return n;
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}
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#endif
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typedef struct _bytecode_prelude_t {
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uint n_state;
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uint n_exc_stack;
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uint scope_flags;
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uint n_pos_args;
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uint n_kwonly_args;
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uint n_def_pos_args;
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uint code_info_size;
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} bytecode_prelude_t;
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// ip will point to start of opcodes
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// ip2 will point to simple_name, source_file qstrs
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STATIC void extract_prelude(const byte **ip, const byte **ip2, bytecode_prelude_t *prelude) {
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prelude->n_state = mp_decode_uint(ip);
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prelude->n_exc_stack = mp_decode_uint(ip);
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prelude->scope_flags = *(*ip)++;
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prelude->n_pos_args = *(*ip)++;
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prelude->n_kwonly_args = *(*ip)++;
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prelude->n_def_pos_args = *(*ip)++;
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*ip2 = *ip;
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prelude->code_info_size = mp_decode_uint(ip2);
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*ip += prelude->code_info_size;
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while (*(*ip)++ != 255) {
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}
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}
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#endif // MICROPY_PERSISTENT_CODE_LOAD || MICROPY_PERSISTENT_CODE_SAVE
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#if MICROPY_PERSISTENT_CODE_LOAD
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#include "py/parsenum.h"
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#include "py/bc0.h"
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STATIC int read_byte(mp_reader_t *reader) {
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return reader->readbyte(reader->data);
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}
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STATIC void read_bytes(mp_reader_t *reader, byte *buf, size_t len) {
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while (len-- > 0) {
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*buf++ = reader->readbyte(reader->data);
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}
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}
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STATIC size_t read_uint(mp_reader_t *reader) {
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size_t unum = 0;
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for (;;) {
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byte b = reader->readbyte(reader->data);
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unum = (unum << 7) | (b & 0x7f);
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if ((b & 0x80) == 0) {
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break;
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}
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}
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return unum;
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}
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STATIC qstr load_qstr(mp_reader_t *reader) {
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size_t len = read_uint(reader);
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char *str = m_new(char, len);
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read_bytes(reader, (byte*)str, len);
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qstr qst = qstr_from_strn(str, len);
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m_del(char, str, len);
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return qst;
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}
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STATIC mp_obj_t load_obj(mp_reader_t *reader) {
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byte obj_type = read_byte(reader);
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if (obj_type == 'e') {
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return MP_OBJ_FROM_PTR(&mp_const_ellipsis_obj);
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} else {
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size_t len = read_uint(reader);
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vstr_t vstr;
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vstr_init_len(&vstr, len);
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read_bytes(reader, (byte*)vstr.buf, len);
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if (obj_type == 's' || obj_type == 'b') {
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return mp_obj_new_str_from_vstr(obj_type == 's' ? &mp_type_str : &mp_type_bytes, &vstr);
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} else if (obj_type == 'i') {
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return mp_parse_num_integer(vstr.buf, vstr.len, 10, NULL);
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} else {
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assert(obj_type == 'f' || obj_type == 'c');
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return mp_parse_num_decimal(vstr.buf, vstr.len, obj_type == 'c', false, NULL);
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}
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}
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}
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STATIC void load_bytecode_qstrs(mp_reader_t *reader, byte *ip, byte *ip_top) {
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while (ip < ip_top) {
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size_t sz;
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uint f = mp_opcode_format(ip, &sz);
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if (f == MP_OPCODE_QSTR) {
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qstr qst = load_qstr(reader);
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ip[1] = qst;
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ip[2] = qst >> 8;
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}
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ip += sz;
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}
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}
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STATIC mp_raw_code_t *load_raw_code(mp_reader_t *reader) {
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// load bytecode
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size_t bc_len = read_uint(reader);
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byte *bytecode = m_new(byte, bc_len);
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read_bytes(reader, bytecode, bc_len);
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// extract prelude
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const byte *ip = bytecode;
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const byte *ip2;
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bytecode_prelude_t prelude;
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extract_prelude(&ip, &ip2, &prelude);
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// load qstrs and link global qstr ids into bytecode
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qstr simple_name = load_qstr(reader);
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qstr source_file = load_qstr(reader);
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((byte*)ip2)[0] = simple_name; ((byte*)ip2)[1] = simple_name >> 8;
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((byte*)ip2)[2] = source_file; ((byte*)ip2)[3] = source_file >> 8;
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load_bytecode_qstrs(reader, (byte*)ip, bytecode + bc_len);
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// load constant table
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size_t n_obj = read_uint(reader);
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size_t n_raw_code = read_uint(reader);
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mp_uint_t *const_table = m_new(mp_uint_t, prelude.n_pos_args + prelude.n_kwonly_args + n_obj + n_raw_code);
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mp_uint_t *ct = const_table;
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for (size_t i = 0; i < prelude.n_pos_args + prelude.n_kwonly_args; ++i) {
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*ct++ = (mp_uint_t)MP_OBJ_NEW_QSTR(load_qstr(reader));
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}
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for (size_t i = 0; i < n_obj; ++i) {
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*ct++ = (mp_uint_t)load_obj(reader);
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}
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for (size_t i = 0; i < n_raw_code; ++i) {
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*ct++ = (mp_uint_t)(uintptr_t)load_raw_code(reader);
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}
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// create raw_code and return it
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mp_raw_code_t *rc = mp_emit_glue_new_raw_code();
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mp_emit_glue_assign_bytecode(rc, bytecode, bc_len, const_table,
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#if MICROPY_PERSISTENT_CODE_SAVE
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n_obj, n_raw_code,
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#endif
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prelude.scope_flags);
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return rc;
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}
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mp_raw_code_t *mp_raw_code_load(mp_reader_t *reader) {
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byte header[4];
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read_bytes(reader, header, sizeof(header));
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if (header[0] != 'M'
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|| header[1] != MPY_VERSION
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|| header[2] != MPY_FEATURE_FLAGS
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|| header[3] > mp_small_int_bits()) {
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mp_raise_ValueError("incompatible .mpy file");
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}
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mp_raw_code_t *rc = load_raw_code(reader);
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reader->close(reader->data);
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return rc;
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}
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mp_raw_code_t *mp_raw_code_load_mem(const byte *buf, size_t len) {
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mp_reader_t reader;
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mp_reader_new_mem(&reader, buf, len, 0);
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return mp_raw_code_load(&reader);
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}
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mp_raw_code_t *mp_raw_code_load_file(const char *filename) {
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mp_reader_t reader;
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mp_reader_new_file(&reader, filename);
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return mp_raw_code_load(&reader);
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}
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#endif // MICROPY_PERSISTENT_CODE_LOAD
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#if MICROPY_PERSISTENT_CODE_SAVE
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#include "py/objstr.h"
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STATIC void mp_print_bytes(mp_print_t *print, const byte *data, size_t len) {
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print->print_strn(print->data, (const char*)data, len);
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}
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#define BYTES_FOR_INT ((BYTES_PER_WORD * 8 + 6) / 7)
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STATIC void mp_print_uint(mp_print_t *print, size_t n) {
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byte buf[BYTES_FOR_INT];
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byte *p = buf + sizeof(buf);
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*--p = n & 0x7f;
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n >>= 7;
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for (; n != 0; n >>= 7) {
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*--p = 0x80 | (n & 0x7f);
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}
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print->print_strn(print->data, (char*)p, buf + sizeof(buf) - p);
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}
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STATIC void save_qstr(mp_print_t *print, qstr qst) {
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size_t len;
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const byte *str = qstr_data(qst, &len);
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mp_print_uint(print, len);
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mp_print_bytes(print, str, len);
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}
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STATIC void save_obj(mp_print_t *print, mp_obj_t o) {
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if (MP_OBJ_IS_STR_OR_BYTES(o)) {
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byte obj_type;
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if (MP_OBJ_IS_STR(o)) {
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obj_type = 's';
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} else {
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obj_type = 'b';
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}
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mp_uint_t len;
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const char *str = mp_obj_str_get_data(o, &len);
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mp_print_bytes(print, &obj_type, 1);
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mp_print_uint(print, len);
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mp_print_bytes(print, (const byte*)str, len);
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} else if (MP_OBJ_TO_PTR(o) == &mp_const_ellipsis_obj) {
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byte obj_type = 'e';
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mp_print_bytes(print, &obj_type, 1);
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} else {
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// we save numbers using a simplistic text representation
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// TODO could be improved
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byte obj_type;
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if (MP_OBJ_IS_TYPE(o, &mp_type_int)) {
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obj_type = 'i';
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} else if (mp_obj_is_float(o)) {
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obj_type = 'f';
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} else {
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assert(MP_OBJ_IS_TYPE(o, &mp_type_complex));
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obj_type = 'c';
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}
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vstr_t vstr;
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mp_print_t pr;
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vstr_init_print(&vstr, 10, &pr);
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mp_obj_print_helper(&pr, o, PRINT_REPR);
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mp_print_bytes(print, &obj_type, 1);
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mp_print_uint(print, vstr.len);
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mp_print_bytes(print, (const byte*)vstr.buf, vstr.len);
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vstr_clear(&vstr);
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}
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}
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STATIC void save_bytecode_qstrs(mp_print_t *print, const byte *ip, const byte *ip_top) {
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while (ip < ip_top) {
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size_t sz;
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uint f = mp_opcode_format(ip, &sz);
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if (f == MP_OPCODE_QSTR) {
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qstr qst = ip[1] | (ip[2] << 8);
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save_qstr(print, qst);
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}
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ip += sz;
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}
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}
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STATIC void save_raw_code(mp_print_t *print, mp_raw_code_t *rc) {
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if (rc->kind != MP_CODE_BYTECODE) {
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mp_raise_ValueError("can only save bytecode");
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}
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// save bytecode
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mp_print_uint(print, rc->data.u_byte.bc_len);
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mp_print_bytes(print, rc->data.u_byte.bytecode, rc->data.u_byte.bc_len);
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// extract prelude
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const byte *ip = rc->data.u_byte.bytecode;
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const byte *ip2;
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bytecode_prelude_t prelude;
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extract_prelude(&ip, &ip2, &prelude);
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// save qstrs
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save_qstr(print, ip2[0] | (ip2[1] << 8)); // simple_name
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save_qstr(print, ip2[2] | (ip2[3] << 8)); // source_file
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save_bytecode_qstrs(print, ip, rc->data.u_byte.bytecode + rc->data.u_byte.bc_len);
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// save constant table
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mp_print_uint(print, rc->data.u_byte.n_obj);
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mp_print_uint(print, rc->data.u_byte.n_raw_code);
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const mp_uint_t *const_table = rc->data.u_byte.const_table;
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for (uint i = 0; i < prelude.n_pos_args + prelude.n_kwonly_args; ++i) {
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mp_obj_t o = (mp_obj_t)*const_table++;
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save_qstr(print, MP_OBJ_QSTR_VALUE(o));
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}
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for (uint i = 0; i < rc->data.u_byte.n_obj; ++i) {
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save_obj(print, (mp_obj_t)*const_table++);
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}
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for (uint i = 0; i < rc->data.u_byte.n_raw_code; ++i) {
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save_raw_code(print, (mp_raw_code_t*)(uintptr_t)*const_table++);
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}
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}
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void mp_raw_code_save(mp_raw_code_t *rc, mp_print_t *print) {
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// header contains:
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// byte 'M'
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// byte version
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// byte feature flags
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// byte number of bits in a small int
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byte header[4] = {'M', MPY_VERSION, MPY_FEATURE_FLAGS_DYNAMIC,
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#if MICROPY_DYNAMIC_COMPILER
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mp_dynamic_compiler.small_int_bits,
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#else
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mp_small_int_bits(),
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#endif
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};
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mp_print_bytes(print, header, sizeof(header));
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save_raw_code(print, rc);
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}
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// here we define mp_raw_code_save_file depending on the port
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// TODO abstract this away properly
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#if defined(__i386__) || defined(__x86_64__) || (defined(__arm__) && (defined(__unix__)))
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#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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STATIC void fd_print_strn(void *env, const char *str, size_t len) {
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int fd = (intptr_t)env;
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ssize_t ret = write(fd, str, len);
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(void)ret;
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}
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void mp_raw_code_save_file(mp_raw_code_t *rc, const char *filename) {
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int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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mp_print_t fd_print = {(void*)(intptr_t)fd, fd_print_strn};
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mp_raw_code_save(rc, &fd_print);
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close(fd);
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}
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#else
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#error mp_raw_code_save_file not implemented for this platform
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#endif
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#endif // MICROPY_PERSISTENT_CODE_SAVE
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