objexcept.c 4.36 KB
Newer Older
1
2
3
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
4
#include <stdarg.h>
5
6
7
8
9
#include <assert.h>

#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
10
#include "mpqstr.h"
11
#include "obj.h"
12
#include "objtuple.h"
13

14
15
16
17
// This is unified class for C-level and Python-level exceptions
// Python-level exception have empty ->msg and all arguments are in
// args tuple. C-level excepttion likely have ->msg, and may as well
// have args tuple (or otherwise have it as NULL).
18
19
typedef struct mp_obj_exception_t {
    mp_obj_base_t base;
20
    mp_obj_t traceback; // a list object, holding (file,line,block) as numbers (not Python objects); a hack for now
21
    qstr id;
22
23
    qstr msg;
    mp_obj_tuple_t args;
24
25
} mp_obj_exception_t;

26
void exception_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
27
    mp_obj_exception_t *o = o_in;
28
29
30
    if (o->msg != 0) {
        print(env, "%s: %s", qstr_str(o->id), qstr_str(o->msg));
    } else {
31
32
33
34
35
36
37
38
39
40
41
42
43
44
        // Yes, that's how CPython has it
        if (kind == PRINT_REPR) {
            print(env, "%s", qstr_str(o->id));
        }
        if (kind == PRINT_STR) {
            if (o->args.len == 0) {
                print(env, "");
                return;
            } else if (o->args.len == 1) {
                mp_obj_print_helper(print, env, o->args.items[0], PRINT_STR);
                return;
            }
        }
        tuple_print(print, env, &o->args, kind);
45
46
47
    }
}

48
static mp_obj_t exception_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
49
    mp_obj_exception_t *base = self_in;
50
51
52
53
54
55

    if (n_kw != 0) {
        nlr_jump(mp_obj_new_exception_msg_1_arg(MP_QSTR_TypeError, "%s does not take keyword arguments", qstr_str(base->id)));
    }

    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, mp_obj_t, n_args);
56
57
58
59
    o->base.type = &exception_type;
    o->id = base->id;
    o->msg = 0;
    o->args.len = n_args;
60
    memcpy(o->args.items, args, n_args * sizeof(mp_obj_t));
61
62
63
    return o;
}

64
65
66
const mp_obj_type_t exception_type = {
    { &mp_const_type },
    "exception",
67
    .print = exception_print,
68
    .call = exception_call,
69
70
71
};

mp_obj_t mp_obj_new_exception(qstr id) {
72
    return mp_obj_new_exception_msg_varg(id, NULL);
73
74
75
}

mp_obj_t mp_obj_new_exception_msg(qstr id, const char *msg) {
76
    return mp_obj_new_exception_msg_varg(id, msg);
77
78
79
}

mp_obj_t mp_obj_new_exception_msg_1_arg(qstr id, const char *fmt, const char *a1) {
80
    return mp_obj_new_exception_msg_varg(id, fmt, a1);
81
82
83
}

mp_obj_t mp_obj_new_exception_msg_2_args(qstr id, const char *fmt, const char *a1, const char *a2) {
84
    return mp_obj_new_exception_msg_varg(id, fmt, a1, a2);
85
}
86

87
88
mp_obj_t mp_obj_new_exception_msg_varg(qstr id, const char *fmt, ...) {
    // make exception object
89
    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, mp_obj_t*, 0);
90
    o->base.type = &exception_type;
91
    o->traceback = MP_OBJ_NULL;
92
    o->id = id;
93
94
95
96
97
98
99
100
101
102
103
    o->args.len = 0;
    if (fmt == NULL) {
        o->msg = 0;
    } else {
        // render exception message
        vstr_t *vstr = vstr_new();
        va_list ap;
        va_start(ap, fmt);
        vstr_vprintf(vstr, fmt, ap);
        va_end(ap);
        o->msg = qstr_from_str_take(vstr->buf, vstr->alloc);
104
105
106
107
108
    }

    return o;
}

109
110
111
112
113
qstr mp_obj_exception_get_type(mp_obj_t self_in) {
    assert(MP_OBJ_IS_TYPE(self_in, &exception_type));
    mp_obj_exception_t *self = self_in;
    return self->id;
}
114

115
void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, machine_uint_t line, qstr block) {
116
117
    assert(MP_OBJ_IS_TYPE(self_in, &exception_type));
    mp_obj_exception_t *self = self_in;
118
119
120
    // for traceback, we are just using the list object for convenience, it's not really a list of Python objects
    if (self->traceback == MP_OBJ_NULL) {
        self->traceback = mp_obj_new_list(0, NULL);
121
    }
122
123
124
    mp_obj_list_append(self->traceback, (mp_obj_t)(machine_uint_t)file);
    mp_obj_list_append(self->traceback, (mp_obj_t)(machine_uint_t)line);
    mp_obj_list_append(self->traceback, (mp_obj_t)(machine_uint_t)block);
125
126
}

127
void mp_obj_exception_get_traceback(mp_obj_t self_in, machine_uint_t *n, machine_uint_t **values) {
128
129
    assert(MP_OBJ_IS_TYPE(self_in, &exception_type));
    mp_obj_exception_t *self = self_in;
130
131
132
133
134
135
136
137
    if (self->traceback == MP_OBJ_NULL) {
        *n = 0;
        *values = NULL;
    } else {
        uint n2;
        mp_obj_list_get(self->traceback, &n2, (mp_obj_t**)values);
        *n = n2;
    }
138
}