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py/emitglue: Add feature-flag header to .mpy to detect bytecode compat. 

Loading .mpy files will now check to make sure that the target VM can
support the bytecode.
This commit is contained in:
Damien George 2015-11-23 10:58:16 +00:00
parent 9f10d3fb63
commit 39a8deb95f
1 changed files with 13 additions and 3 deletions
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16
py/emitglue.c
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@ -319,12 +319,16 @@ STATIC mp_raw_code_t *load_raw_code(mp_reader_t *reader) {
}
mp_raw_code_t *mp_raw_code_load(mp_reader_t *reader) {
byte header[2];
read_bytes(reader, header, 2);
byte header[3];
read_bytes(reader, header, 3);
if (strncmp((char*)header, "M\x00", 2) != 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"invalid .mpy file"));
}
if (header[2] != MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"incompatible .mpy file"));
}
return load_raw_code(reader);
}
@ -558,7 +562,13 @@ STATIC void save_raw_code(mp_print_t *print, mp_raw_code_t *rc) {
}
void mp_raw_code_save(mp_raw_code_t *rc, mp_print_t *print) {
mp_print_bytes(print, (const byte*)"M\x00", 2);
// header contains:
// byte 'M'
// byte version
// byte feature flags (right now just OPT_CACHE_MAP_LOOKUP_IN_BYTECODE)
byte header[3] = {'M', 0, MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE};
mp_print_bytes(print, header, 3);
save_raw_code(print, rc);
}