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py: Add support for __debug__ constant. 

__debug__ now resolves to True or False.  Its value needs to be set by
mp_set_debug().

TODO: call mp_set_debug in unix/ port.

TODO: optimise away "if False:" statements in compiler.
This commit is contained in:
Damien George 2014-05-12 23:07:34 +01:00
parent 96f137b24a
commit 97f9a2813e
3 changed files with 25 additions and 4 deletions
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20
py/lexer.c
View File

@ -64,6 +64,13 @@ struct _mp_lexer_t {
mp_token_t tok_cur;
};
// debug flag for __debug__ constant
STATIC mp_token_kind_t mp_debug_value;
void mp_set_debug(bool value) {
mp_debug_value = value ? MP_TOKEN_KW_TRUE : MP_TOKEN_KW_FALSE;
}
// TODO replace with a call to a standard function
bool str_strn_equal(const char *str, const char *strn, int len) {
uint i = 0;
@ -303,7 +310,7 @@ STATIC const char *tok_kw[] = {
"while",
"with",
"yield",
NULL,
"__debug__",
};
STATIC int hex_digit(unichar c) {
@ -687,9 +694,18 @@ STATIC void mp_lexer_next_token_into(mp_lexer_t *lex, mp_token_t *tok, bool firs
// check for keywords
if (tok->kind == MP_TOKEN_NAME) {
for (int i = 0; tok_kw[i] != NULL; i++) {
// We check for __debug__ here and convert it to its value. This is so
// the parser gives a syntax error on, eg, x.__debug__. Otherwise, we
// need to check for this special token in many places in the compiler.
// TODO improve speed of these string comparisons
//for (int i = 0; tok_kw[i] != NULL; i++) {
for (int i = 0; i < ARRAY_SIZE(tok_kw); i++) {
if (str_strn_equal(tok_kw[i], tok->str, tok->len)) {
if (i == ARRAY_SIZE(tok_kw) - 1) {
tok->kind = mp_debug_value;
} else {
tok->kind = MP_TOKEN_KW_FALSE + i;
}
break;
}
}

3
py/runtime.c
View File

@ -74,6 +74,9 @@ void mp_init(void) {
MICROPY_PORT_INIT_FUNC;
#endif
// __debug__ enabled by default
mp_set_debug(true);
mp_emit_glue_init();
// init global module stuff

2
py/runtime.h
View File

@ -54,6 +54,8 @@ typedef struct _mp_arg_t {
void mp_init(void);
void mp_deinit(void);
void mp_set_debug(bool value); // sets the value of __debug__; see lexer.c
void mp_arg_check_num(uint n_args, uint n_kw, uint n_args_min, uint n_args_max, bool takes_kw);
void mp_arg_parse_all(uint n_pos, const mp_obj_t *pos, mp_map_t *kws, uint n_allowed, const mp_arg_t *allowed, mp_arg_val_t *out_vals);
void mp_arg_parse_all_kw_array(uint n_pos, uint n_kw, const mp_obj_t *args, uint n_allowed, const mp_arg_t *allowed, mp_arg_val_t *out_vals);