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py/emitglue: Add more feature flags to .mpy persistent bytecode output. 

Need to record in .mpy file whether unicode is enabled, and how many bits
are in a small int.
This commit is contained in:
Damien George 2016-01-08 13:35:35 +00:00
parent adfe4ff72a
commit 1404d620c0
1 changed files with 29 additions and 6 deletions
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35
py/emitglue.c
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@ -196,6 +196,28 @@ mp_obj_t mp_make_closure_from_raw_code(mp_raw_code_t *rc, mp_uint_t n_closed_ove
#if MICROPY_PERSISTENT_CODE
#include "py/smallint.h"
// The feature flags byte encodes the compile-time config options that
// affect the generate bytecode.
#define MPY_FEATURE_FLAGS ( \
((MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE) << 0) \
| ((MICROPY_PY_BUILTINS_STR_UNICODE) << 1) \
)
// The bytecode will depend on the number of bits in a small-int, and
// this function computes that (could make it a fixed constant, but it
// would need to be defined in mpconfigport.h).
STATIC int mp_small_int_bits(void) {
mp_int_t i = MP_SMALL_INT_MAX;
int n = 1;
while (i != 0) {
i >>= 1;
++n;
}
return n;
}
typedef struct _bytecode_prelude_t {
uint n_state;
uint n_exc_stack;
@ -338,13 +360,13 @@ 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[3];
read_bytes(reader, header, 3);
byte header[4];
read_bytes(reader, header, sizeof(header));
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) {
if (header[2] != MPY_FEATURE_FLAGS || header[3] != mp_small_int_bits()) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
"incompatible .mpy file"));
}
@ -591,9 +613,10 @@ void mp_raw_code_save(mp_raw_code_t *rc, mp_print_t *print) {
// 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);
// byte feature flags
// byte number of bits in a small int
byte header[4] = {'M', 0, MPY_FEATURE_FLAGS, mp_small_int_bits()};
mp_print_bytes(print, header, sizeof(header));
save_raw_code(print, rc);
}