py/qstr: Change qstr hash type from mp_uint_t to size_t.
The hash is either 8 or 16 bits (depending on MICROPY_QSTR_BYTES_IN_HASH) so will fit in a size_t. This saves 268 bytes on the unix nanbox build. Non-nanbox configurations are unchanged because mp_uint_t is the same size as size_t. Signed-off-by: Damien George <damien@micropython.org>
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@ -30,7 +30,7 @@
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typedef struct _mp_obj_str_t {
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mp_obj_base_t base;
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mp_uint_t hash;
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size_t hash;
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// len == number of bytes used in data, alloc = len + 1 because (at the moment) we also append a null byte
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size_t len;
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const byte *data;
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@ -41,7 +41,7 @@ typedef struct _mp_obj_str_t {
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// use this macro to extract the string hash
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// warning: the hash can be 0, meaning invalid, and must then be explicitly computed from the data
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#define GET_STR_HASH(str_obj_in, str_hash) \
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mp_uint_t str_hash; \
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size_t str_hash; \
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if (mp_obj_is_qstr(str_obj_in)) { \
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str_hash = qstr_hash(MP_OBJ_QSTR_VALUE(str_obj_in)); \
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} else { \
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@ -60,9 +60,9 @@
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#define MICROPY_ALLOC_QSTR_ENTRIES_INIT (10)
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// this must match the equivalent function in makeqstrdata.py
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mp_uint_t qstr_compute_hash(const byte *data, size_t len) {
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size_t qstr_compute_hash(const byte *data, size_t len) {
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// djb2 algorithm; see http://www.cse.yorku.ca/~oz/hash.html
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mp_uint_t hash = 5381;
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size_t hash = 5381;
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for (const byte *top = data + len; data < top; data++) {
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hash = ((hash << 5) + hash) ^ (*data); // hash * 33 ^ data
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}
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@ -181,7 +181,7 @@ STATIC qstr qstr_add(mp_uint_t hash, mp_uint_t len, const char *q_ptr) {
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qstr qstr_find_strn(const char *str, size_t str_len) {
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// work out hash of str
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mp_uint_t str_hash = qstr_compute_hash((const byte *)str, str_len);
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size_t str_hash = qstr_compute_hash((const byte *)str, str_len);
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// search pools for the data
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for (const qstr_pool_t *pool = MP_STATE_VM(last_pool); pool != NULL; pool = pool->prev) {
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@ -254,7 +254,7 @@ qstr qstr_from_strn(const char *str, size_t len) {
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MP_STATE_VM(qstr_last_used) += n_bytes;
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// store the interned strings' data
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mp_uint_t hash = qstr_compute_hash((const byte *)str, len);
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size_t hash = qstr_compute_hash((const byte *)str, len);
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memcpy(q_ptr, str, len);
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q_ptr[len] = '\0';
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q = qstr_add(hash, len, q_ptr);
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@ -78,7 +78,7 @@ typedef struct _qstr_pool_t {
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void qstr_init(void);
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mp_uint_t qstr_compute_hash(const byte *data, size_t len);
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size_t qstr_compute_hash(const byte *data, size_t len);
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qstr qstr_find_strn(const char *str, size_t str_len); // returns MP_QSTRnull if not found
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qstr qstr_from_str(const char *str);
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