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.
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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
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#if MICROPY_PERSISTENT_CODE
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#include "py/smallint.h"
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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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// 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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typedef struct _bytecode_prelude_t {
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uint n_state;
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uint n_exc_stack;
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@ -338,13 +360,13 @@ STATIC mp_raw_code_t *load_raw_code(mp_reader_t *reader) {
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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[3];
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read_bytes(reader, header, 3);
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byte header[4];
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read_bytes(reader, header, sizeof(header));
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if (strncmp((char*)header, "M\x00", 2) != 0) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
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"invalid .mpy file"));
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}
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if (header[2] != MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE) {
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if (header[2] != MPY_FEATURE_FLAGS || header[3] != mp_small_int_bits()) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
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"incompatible .mpy file"));
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}
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@ -591,9 +613,10 @@ 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 (right now just OPT_CACHE_MAP_LOOKUP_IN_BYTECODE)
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byte header[3] = {'M', 0, MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE};
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mp_print_bytes(print, header, 3);
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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', 0, MPY_FEATURE_FLAGS, mp_small_int_bits()};
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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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