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#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "objtuple.h"
// 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).
typedef struct mp_obj_exception_t {
mp_obj_base_t base;
mp_obj_t traceback; // a list object, holding (file,line,block) as numbers (not Python objects); a hack for now
qstr id;
qstr msg;
mp_obj_tuple_t args;
} mp_obj_exception_t;
void exception_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_exception_t *o = o_in;
if (o->msg != 0) {
print(env, "%s: %s", qstr_str(o->id), qstr_str(o->msg));
} else {
// 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);
}
}
static mp_obj_t exception_call(mp_obj_t self_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_exception_t *base = self_in;
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);
o->base.type = &exception_type;
o->id = base->id;
o->msg = 0;
o->args.len = n_args;
memcpy(o->args.items, args, n_args * sizeof(mp_obj_t));
return o;
}
const mp_obj_type_t exception_type = {
{ &mp_const_type },
"exception",
.print = exception_print,
.call = exception_call,
};
mp_obj_t mp_obj_new_exception(qstr id) {
return mp_obj_new_exception_msg_varg(id, NULL);
}
mp_obj_t mp_obj_new_exception_msg(qstr id, const char *msg) {
return mp_obj_new_exception_msg_varg(id, msg);
}
mp_obj_t mp_obj_new_exception_msg_1_arg(qstr id, const char *fmt, const char *a1) {
return mp_obj_new_exception_msg_varg(id, fmt, a1);
}
mp_obj_t mp_obj_new_exception_msg_2_args(qstr id, const char *fmt, const char *a1, const char *a2) {
return mp_obj_new_exception_msg_varg(id, fmt, a1, a2);
}
mp_obj_t mp_obj_new_exception_msg_varg(qstr id, const char *fmt, ...) {
// make exception object
mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, mp_obj_t*, 0);
o->base.type = &exception_type;
o->traceback = MP_OBJ_NULL;
o->id = id;
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_strn_take(vstr->buf, vstr->alloc, vstr->len);
}
return o;
}
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;
}
void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, machine_uint_t line, qstr block) {
assert(MP_OBJ_IS_TYPE(self_in, &exception_type));
mp_obj_exception_t *self = self_in;
// 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);
}
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);
}
void mp_obj_exception_get_traceback(mp_obj_t self_in, machine_uint_t *n, machine_uint_t **values) {
assert(MP_OBJ_IS_TYPE(self_in, &exception_type));
mp_obj_exception_t *self = self_in;
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;
}
}
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