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py: Implement 'not' in compiler, and improve rt_is_true.

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This commit is contained in:
Damien George 2014-01-28 23:27:35 +00:00
parent b40892d266
commit e4b6a079b3
3 changed files with 26 additions and 17 deletions
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14
py/compile.c
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@ -1912,7 +1912,21 @@ void compile_and_test(compiler_t *comp, mp_parse_node_struct_t *pns) {
void compile_not_test_2(compiler_t *comp, mp_parse_node_struct_t *pns) {
compile_node(comp, pns->nodes[0]);
#if MICROPY_EMIT_CPYTHON
EMIT_ARG(unary_op, RT_UNARY_OP_NOT);
#else
// eliminate use of NOT byte code
int l_load_false = comp_next_label(comp);
int l_done = comp_next_label(comp);
int stack_size = EMIT(get_stack_size);
EMIT_ARG(pop_jump_if_true, l_load_false);
EMIT_ARG(load_const_tok, MP_TOKEN_KW_TRUE);
EMIT_ARG(jump, l_done);
EMIT_ARG(label_assign, l_load_false);
EMIT_ARG(load_const_tok, MP_TOKEN_KW_FALSE);
EMIT_ARG(label_assign, l_done);
EMIT_ARG(set_stack_size, stack_size); // force stack size since it counts 1 pop and 2 pushes statically, but really it's 1 pop and 1 push dynamically
#endif
}
void compile_comparison(compiler_t *comp, mp_parse_node_struct_t *pns) {

27
py/runtime.c
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@ -315,23 +315,18 @@ int rt_is_true(mp_obj_t arg) {
return 0;
} else if (arg == mp_const_true) {
return 1;
} else if (MP_OBJ_IS_STR(arg)) {
return mp_obj_str_get_len(arg) != 0;
} else if (MP_OBJ_IS_TYPE(arg, &list_type)) {
uint len;
mp_obj_t *dummy;
mp_obj_list_get(arg, &len, &dummy);
return len != 0;
} else if (MP_OBJ_IS_TYPE(arg, &tuple_type)) {
uint len;
mp_obj_t *dummy;
mp_obj_tuple_get(arg, &len, &dummy);
return len != 0;
} else if (MP_OBJ_IS_TYPE(arg, &dict_type)) {
return mp_obj_dict_len(arg) != 0;
} else {
assert(0);
return 0;
mp_obj_t len = mp_obj_len_maybe(arg);
if (len != MP_OBJ_NULL) {
// obj has a length, truth determined if len != 0
return len != MP_OBJ_NEW_SMALL_INT(0);
} else {
// TODO check for __bool__ method
// TODO check floats and complex numbers
// any other obj is true (TODO is that correct?)
return 1;
}
}
}

2
py/runtime0.h
View File

@ -1,5 +1,5 @@
typedef enum {
RT_UNARY_OP_NOT,
RT_UNARY_OP_NOT, // TODO remove this op since it's no longer needed
RT_UNARY_OP_POSITIVE,
RT_UNARY_OP_NEGATIVE,
RT_UNARY_OP_INVERT,