objexcept.c 10.9 KB
Newer Older
1
#include <string.h>
2
#include <stdarg.h>
3
4
5
6
7
#include <assert.h>

#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
8
#include "qstr.h"
9
#include "obj.h"
10
#include "objtuple.h"
11
12
#include "runtime.h"
#include "runtime0.h"
13

14
typedef struct _mp_obj_exception_t {
15
    mp_obj_base_t base;
16
    mp_obj_t traceback; // a list object, holding (file,line,block) as numbers (not Python objects); a hack for now
17
    mp_obj_tuple_t args;
18
19
} mp_obj_exception_t;

20
21
22
// Instance of GeneratorExit exception - needed by generator.close()
// This would belong to objgenerator.c, but to keep mp_obj_exception_t
// definition module-private so far, have it here.
23
const mp_obj_exception_t mp_const_GeneratorExit_obj = {{&mp_type_GeneratorExit}, MP_OBJ_NULL, {{&mp_type_tuple}, 0}};
24

25
STATIC void mp_obj_exception_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
26
    mp_obj_exception_t *o = o_in;
27
28
29
30
31
32
33
34
35
36
37
38
    if (kind == PRINT_REPR) {
        print(env, "%s", qstr_str(o->base.type->name));
    } else if (kind == PRINT_EXC) {
        print(env, "%s: ", qstr_str(o->base.type->name));
    }
    if (kind == PRINT_STR || kind == PRINT_EXC) {
        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;
39
        }
40
    }
41
    tuple_print(print, env, &o->args, kind);
42
43
}

44
45
STATIC mp_obj_t mp_obj_exception_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
    mp_obj_type_t *type = type_in;
46
47

    if (n_kw != 0) {
Damien George's avatar
Damien George committed
48
        nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "%s does not take keyword arguments", mp_obj_get_type_str(type_in)));
49
50
51
    }

    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, mp_obj_t, n_args);
52
    o->base.type = type;
53
    o->traceback = MP_OBJ_NULL;
54
    o->args.base.type = &mp_type_tuple;
55
    o->args.len = n_args;
56
    memcpy(o->args.items, args, n_args * sizeof(mp_obj_t));
57
58
59
    return o;
}

60
61
62
63
64
65
66
67
68
69
// Get exception "value" - that is, first argument, or None
mp_obj_t mp_obj_exception_get_value(mp_obj_t self_in) {
    mp_obj_exception_t *self = self_in;
    if (self->args.len == 0) {
        return mp_const_none;
    } else {
        return self->args.items[0];
    }
}

70
71
72
73
74
STATIC void exception_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
    mp_obj_exception_t *self = self_in;
    if (attr == MP_QSTR_args) {
        dest[0] = &self->args;
    } else if (self->base.type == &mp_type_StopIteration && attr == MP_QSTR_value) {
75
        dest[0] = mp_obj_exception_get_value(self);
76
77
78
    }
}

79
80
81
82
83
const mp_obj_type_t mp_type_BaseException = {
    { &mp_type_type },
    .name = MP_QSTR_BaseException,
    .print = mp_obj_exception_print,
    .make_new = mp_obj_exception_make_new,
84
    .load_attr = exception_load_attr,
85
86
};

87
#define MP_DEFINE_EXCEPTION_BASE(base_name) \
88
STATIC const mp_obj_tuple_t mp_type_ ## base_name ## _base_tuple = {{&mp_type_tuple}, 1, {(mp_obj_t)&mp_type_ ## base_name}};\
89
90

#define MP_DEFINE_EXCEPTION(exc_name, base_name) \
91
92
93
94
95
const mp_obj_type_t mp_type_ ## exc_name = { \
    { &mp_type_type }, \
    .name = MP_QSTR_ ## exc_name, \
    .print = mp_obj_exception_print, \
    .make_new = mp_obj_exception_make_new, \
96
    .load_attr = exception_load_attr, \
97
    .bases_tuple = (mp_obj_t)&mp_type_ ## base_name ## _base_tuple, \
98
99
};

100
101
// List of all exceptions, arranged as in the table at:
// http://docs.python.org/3.3/library/exceptions.html
102
MP_DEFINE_EXCEPTION_BASE(BaseException)
103
//MP_DEFINE_EXCEPTION(SystemExit, BaseException)
104
105
106
107
108
109
110
//MP_DEFINE_EXCEPTION(KeyboardInterrupt, BaseException)
MP_DEFINE_EXCEPTION(GeneratorExit, BaseException)
MP_DEFINE_EXCEPTION(Exception, BaseException)
  MP_DEFINE_EXCEPTION_BASE(Exception)
  MP_DEFINE_EXCEPTION(StopIteration, Exception)
  MP_DEFINE_EXCEPTION(ArithmeticError, Exception)
    MP_DEFINE_EXCEPTION_BASE(ArithmeticError)
111
    //MP_DEFINE_EXCEPTION(FloatingPointError, ArithmeticError)
112
113
114
115
    MP_DEFINE_EXCEPTION(OverflowError, ArithmeticError)
    MP_DEFINE_EXCEPTION(ZeroDivisionError, ArithmeticError)
  MP_DEFINE_EXCEPTION(AssertionError, Exception)
  MP_DEFINE_EXCEPTION(AttributeError, Exception)
116
  //MP_DEFINE_EXCEPTION(BufferError, Exception)
117
  //MP_DEFINE_EXCEPTION(EnvironmentError, Exception)
118
119
120
121
122
123
124
125
126
127
  MP_DEFINE_EXCEPTION(EOFError, Exception)
  MP_DEFINE_EXCEPTION(ImportError, Exception)
  MP_DEFINE_EXCEPTION(IOError, Exception)
  MP_DEFINE_EXCEPTION(LookupError, Exception)
    MP_DEFINE_EXCEPTION_BASE(LookupError)
    MP_DEFINE_EXCEPTION(IndexError, LookupError)
    MP_DEFINE_EXCEPTION(KeyError, LookupError)
  MP_DEFINE_EXCEPTION(MemoryError, Exception)
  MP_DEFINE_EXCEPTION(NameError, Exception)
    MP_DEFINE_EXCEPTION_BASE(NameError)
128
    //MP_DEFINE_EXCEPTION(UnboundLocalError, NameError)
129
  MP_DEFINE_EXCEPTION(OSError, Exception)
130
    MP_DEFINE_EXCEPTION_BASE(OSError)
131
132
    /*
    MP_DEFINE_EXCEPTION(BlockingIOError, OSError)
133
134
135
136
137
138
139
140
141
142
143
    MP_DEFINE_EXCEPTION(ChildProcessError, OSError)
    MP_DEFINE_EXCEPTION(ConnectionError, OSError)
      MP_DEFINE_EXCEPTION(BrokenPipeError, ConnectionError)
      MP_DEFINE_EXCEPTION(ConnectionAbortedError, ConnectionError)
      MP_DEFINE_EXCEPTION(ConnectionRefusedError, ConnectionError)
      MP_DEFINE_EXCEPTION(ConnectionResetError, ConnectionError)
    MP_DEFINE_EXCEPTION(InterruptedError, OSError)
    MP_DEFINE_EXCEPTION(IsADirectoryError, OSError)
    MP_DEFINE_EXCEPTION(NotADirectoryError, OSError)
    MP_DEFINE_EXCEPTION(PermissionError, OSError)
    MP_DEFINE_EXCEPTION(ProcessLookupError, OSError)
144
    MP_DEFINE_EXCEPTION(TimeoutError, OSError)
145
146
    MP_DEFINE_EXCEPTION(FileExistsError, OSError)
    MP_DEFINE_EXCEPTION(FileNotFoundError, OSError)
147
148
    MP_DEFINE_EXCEPTION(ReferenceError, Exception)
    */
149
150
151
152
153
154
  MP_DEFINE_EXCEPTION(RuntimeError, Exception)
    MP_DEFINE_EXCEPTION_BASE(RuntimeError)
    MP_DEFINE_EXCEPTION(NotImplementedError, RuntimeError)
  MP_DEFINE_EXCEPTION(SyntaxError, Exception)
    MP_DEFINE_EXCEPTION_BASE(SyntaxError)
    MP_DEFINE_EXCEPTION(IndentationError, SyntaxError)
155
    /*
156
      MP_DEFINE_EXCEPTION_BASE(IndentationError)
157
158
      MP_DEFINE_EXCEPTION(TabError, IndentationError)
      */
159
160
161
162
  MP_DEFINE_EXCEPTION(SystemError, Exception)
  MP_DEFINE_EXCEPTION(TypeError, Exception)
  MP_DEFINE_EXCEPTION(ValueError, Exception)
    //TODO: Implement UnicodeErrors which take arguments
163
  /*
164
165
166
167
168
169
170
171
172
173
174
175
  MP_DEFINE_EXCEPTION(Warning, Exception)
    MP_DEFINE_EXCEPTION_BASE(Warning)
    MP_DEFINE_EXCEPTION(DeprecationWarning, Warning)
    MP_DEFINE_EXCEPTION(PendingDeprecationWarning, Warning)
    MP_DEFINE_EXCEPTION(RuntimeWarning, Warning)
    MP_DEFINE_EXCEPTION(SyntaxWarning, Warning)
    MP_DEFINE_EXCEPTION(UserWarning, Warning)
    MP_DEFINE_EXCEPTION(FutureWarning, Warning)
    MP_DEFINE_EXCEPTION(ImportWarning, Warning)
    MP_DEFINE_EXCEPTION(UnicodeWarning, Warning)
    MP_DEFINE_EXCEPTION(BytesWarning, Warning)
    MP_DEFINE_EXCEPTION(ResourceWarning, Warning)
176
    */
177
178

mp_obj_t mp_obj_new_exception(const mp_obj_type_t *exc_type) {
179
    return mp_obj_new_exception_args(exc_type, 0, NULL);
180
181
}

182
183
184
185
186
mp_obj_t mp_obj_new_exception_args(const mp_obj_type_t *exc_type, uint n_args, const mp_obj_t *args) {
    assert(exc_type->make_new == mp_obj_exception_make_new);
    return exc_type->make_new((mp_obj_t)exc_type, n_args, 0, args);
}

187
188
mp_obj_t mp_obj_new_exception_msg(const mp_obj_type_t *exc_type, const char *msg) {
    return mp_obj_new_exception_msg_varg(exc_type, msg);
189
190
}

191
192
193
194
mp_obj_t mp_obj_new_exception_msg_varg(const mp_obj_type_t *exc_type, const char *fmt, ...) {
    // check that the given type is an exception type
    assert(exc_type->make_new == mp_obj_exception_make_new);

195
    // make exception object
196
    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, mp_obj_t, 1);
197
    o->base.type = exc_type;
198
    o->traceback = MP_OBJ_NULL;
199
    o->args.base.type = &mp_type_tuple;
200
    o->args.len = 1;
201

202
    if (fmt == NULL) {
203
        // no message
204
        assert(0);
205
    } else {
206
207
208
        // render exception message and store as .args[0]
        // TODO: optimize bufferbloat
        vstr_t *vstr = vstr_new();
209
210
        va_list ap;
        va_start(ap, fmt);
211
        vstr_vprintf(vstr, fmt, ap);
212
        va_end(ap);
213
214
        o->args.items[0] = mp_obj_new_str((byte*)vstr->buf, vstr->len, false);
        vstr_free(vstr);
215
216
217
218
219
    }

    return o;
}

220
221
222
// return true if the given object is an exception type
bool mp_obj_is_exception_type(mp_obj_t self_in) {
    if (MP_OBJ_IS_TYPE(self_in, &mp_type_type)) {
223
        // optimisation when self_in is a builtin exception
224
        mp_obj_type_t *self = self_in;
225
226
227
        if (self->make_new == mp_obj_exception_make_new) {
            return true;
        }
228
    }
229
    return mp_obj_is_subclass_fast(self_in, &mp_type_BaseException);
230
231
232
233
}

// return true if the given object is an instance of an exception type
bool mp_obj_is_exception_instance(mp_obj_t self_in) {
234
    return mp_obj_is_exception_type(mp_obj_get_type(self_in));
235
236
}

237
238
239
240
// return true if exception (type or instance) is a subclass of given
// exception type.
bool mp_obj_exception_match(mp_obj_t exc, const mp_obj_type_t *exc_type) {
    // TODO: move implementation from RT_BINARY_OP_EXCEPTION_MATCH here.
Damien George's avatar
Damien George committed
241
    return mp_binary_op(MP_BINARY_OP_EXCEPTION_MATCH, exc, (mp_obj_t)exc_type) == mp_const_true;
242
243
}

244
245
void mp_obj_exception_clear_traceback(mp_obj_t self_in) {
    // make sure self_in is an exception instance
246
247
248
    // TODO add traceback information to user-defined exceptions (need proper builtin subclassing for that)
    if (mp_obj_get_type(self_in)->make_new == mp_obj_exception_make_new) {
        mp_obj_exception_t *self = self_in;
249

250
251
252
253
        // just set the traceback to the null object
        // we don't want to call any memory management functions here
        self->traceback = MP_OBJ_NULL;
    }
254
}
255

256
void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, machine_uint_t line, qstr block) {
257
    // make sure self_in is an exception instance
258
259
260
    // TODO add traceback information to user-defined exceptions (need proper builtin subclassing for that)
    if (mp_obj_get_type(self_in)->make_new == mp_obj_exception_make_new) {
        mp_obj_exception_t *self = self_in;
261

262
263
264
265
266
267
268
        // 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);
269
    }
270
271
}

272
void mp_obj_exception_get_traceback(mp_obj_t self_in, machine_uint_t *n, machine_uint_t **values) {
273
274
    // make sure self_in is an exception instance
    assert(mp_obj_get_type(self_in)->make_new == mp_obj_exception_make_new);
275
    mp_obj_exception_t *self = self_in;
276

277
278
279
280
281
282
283
284
    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;
    }
285
}