Skip to content
Navigation Menu
{{ message }}
forked from adafruit/circuitpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathobjgenerator.c
More file actions
246 lines (211 loc) · 9.55 KB
/
Copy pathobjgenerator.c
File metadata and controls
246 lines (211 loc) · 9.55 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014 Paul Sokolovsky
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <assert.h>
#include "py/nlr.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "py/bc.h"
#include "py/objgenerator.h"
#include "py/objfun.h"
/******************************************************************************/
/* generator wrapper */
typedef struct _mp_obj_gen_wrap_t {
mp_obj_base_t base;
mp_obj_t *fun;
} mp_obj_gen_wrap_t;
typedef struct _mp_obj_gen_instance_t {
mp_obj_base_t base;
mp_obj_dict_t *globals;
mp_code_state code_state;
} mp_obj_gen_instance_t;
STATIC mp_obj_t gen_wrap_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_obj_gen_wrap_t *self = MP_OBJ_TO_PTR(self_in);
mp_obj_fun_bc_t *self_fun = (mp_obj_fun_bc_t*)self->fun;
assert(self_fun->base.type == &mp_type_fun_bc);
// get start of bytecode
const byte *ip = self_fun->bytecode;
// bytecode prelude: get state size and exception stack size
mp_uint_t n_state = mp_decode_uint(&ip);
mp_uint_t n_exc_stack = mp_decode_uint(&ip);
// allocate the generator object, with room for local stack and exception stack
mp_obj_gen_instance_t *o = m_new_obj_var(mp_obj_gen_instance_t, byte,
n_state * sizeof(mp_obj_t) + n_exc_stack * sizeof(mp_exc_stack_t));
o->base.type = &mp_type_gen_instance;
o->globals = self_fun->globals;
o->code_state.n_state = n_state;
o->code_state.ip = (byte*)(ip - self_fun->bytecode); // offset to prelude
mp_setup_code_state(&o->code_state, self_fun, n_args, n_kw, args);
return MP_OBJ_FROM_PTR(o);
}
const mp_obj_type_t mp_type_gen_wrap = {
{ &mp_type_type },
.name = MP_QSTR_generator,
.call = gen_wrap_call,
};
mp_obj_t mp_obj_new_gen_wrap(mp_obj_t fun) {
mp_obj_gen_wrap_t *o = m_new_obj(mp_obj_gen_wrap_t);
o->base.type = &mp_type_gen_wrap;
o->fun = MP_OBJ_TO_PTR(fun);
return MP_OBJ_FROM_PTR(o);
}
/******************************************************************************/
/* generator instance */
STATIC void gen_instance_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_gen_instance_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "<generator object '%q' at %p>", mp_obj_code_get_name(self->code_state.code_info), self);
}
mp_vm_return_kind_t mp_obj_gen_resume(mp_obj_t self_in, mp_obj_t send_value, mp_obj_t throw_value, mp_obj_t *ret_val) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_gen_instance));
mp_obj_gen_instance_t *self = MP_OBJ_TO_PTR(self_in);
if (self->code_state.ip == 0) {
// Trying to resume already stopped generator
*ret_val = MP_OBJ_STOP_ITERATION;
return MP_VM_RETURN_NORMAL;
}
if (self->code_state.sp == self->code_state.state - 1) {
if (send_value != mp_const_none) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "can't send non-None value to a just-started generator"));
}
} else {
*self->code_state.sp = send_value;
}
mp_obj_dict_t *old_globals = mp_globals_get();
mp_globals_set(self->globals);
mp_vm_return_kind_t ret_kind = mp_execute_bytecode(&self->code_state, throw_value);
mp_globals_set(old_globals);
switch (ret_kind) {
case MP_VM_RETURN_NORMAL:
default:
// Explicitly mark generator as completed. If we don't do this,
// subsequent next() may re-execute statements after last yield
// again and again, leading to side effects.
// TODO: check how return with value behaves under such conditions
// in CPython.
self->code_state.ip = 0;
*ret_val = *self->code_state.sp;
break;
case MP_VM_RETURN_YIELD:
*ret_val = *self->code_state.sp;
if (*ret_val == MP_OBJ_STOP_ITERATION) {
self->code_state.ip = 0;
}
break;
case MP_VM_RETURN_EXCEPTION:
self->code_state.ip = 0;
*ret_val = self->code_state.state[self->code_state.n_state - 1];
break;
}
return ret_kind;
}
STATIC mp_obj_t gen_resume_and_raise(mp_obj_t self_in, mp_obj_t send_value, mp_obj_t throw_value) {
mp_obj_t ret;
switch (mp_obj_gen_resume(self_in, send_value, throw_value, &ret)) {
case MP_VM_RETURN_NORMAL:
default:
// Optimize return w/o value in case generator is used in for loop
if (ret == mp_const_none || ret == MP_OBJ_STOP_ITERATION) {
return MP_OBJ_STOP_ITERATION;
} else {
nlr_raise(mp_obj_new_exception_args(&mp_type_StopIteration, 1, &ret));
}
case MP_VM_RETURN_YIELD:
if (throw_value != MP_OBJ_NULL && mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(throw_value)), MP_OBJ_FROM_PTR(&mp_type_GeneratorExit))) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_RuntimeError, "generator ignored GeneratorExit"));
}
return ret;
case MP_VM_RETURN_EXCEPTION:
// TODO: Optimization of returning MP_OBJ_STOP_ITERATION is really part
// of mp_iternext() protocol, but this function is called by other methods
// too, which may not handled MP_OBJ_STOP_ITERATION.
if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(ret)), MP_OBJ_FROM_PTR(&mp_type_StopIteration))) {
mp_obj_t val = mp_obj_exception_get_value(ret);
if (val == mp_const_none) {
return MP_OBJ_STOP_ITERATION;
}
}
nlr_raise(ret);
}
}
STATIC mp_obj_t gen_instance_iternext(mp_obj_t self_in) {
return gen_resume_and_raise(self_in, mp_const_none, MP_OBJ_NULL);
}
STATIC mp_obj_t gen_instance_send(mp_obj_t self_in, mp_obj_t send_value) {
mp_obj_t ret = gen_resume_and_raise(self_in, send_value, MP_OBJ_NULL);
if (ret == MP_OBJ_STOP_ITERATION) {
nlr_raise(mp_obj_new_exception(&mp_type_StopIteration));
} else {
return ret;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(gen_instance_send_obj, gen_instance_send);
STATIC mp_obj_t gen_instance_close(mp_obj_t self_in);
STATIC mp_obj_t gen_instance_throw(size_t n_args, const mp_obj_t *args) {
mp_obj_t exc = (n_args == 2) ? args[1] : args[2];
exc = mp_make_raise_obj(exc);
mp_obj_t ret = gen_resume_and_raise(args[0], mp_const_none, exc);
if (ret == MP_OBJ_STOP_ITERATION) {
nlr_raise(mp_obj_new_exception(&mp_type_StopIteration));
} else {
return ret;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(gen_instance_throw_obj, 2, 4, gen_instance_throw);
STATIC mp_obj_t gen_instance_close(mp_obj_t self_in) {
mp_obj_t ret;
switch (mp_obj_gen_resume(self_in, mp_const_none, MP_OBJ_FROM_PTR(&mp_const_GeneratorExit_obj), &ret)) {
case MP_VM_RETURN_YIELD:
nlr_raise(mp_obj_new_exception_msg(&mp_type_RuntimeError, "generator ignored GeneratorExit"));
// Swallow StopIteration & GeneratorExit (== successful close), and re-raise any other
case MP_VM_RETURN_EXCEPTION:
// ret should always be an instance of an exception class
if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(ret)), MP_OBJ_FROM_PTR(&mp_type_GeneratorExit)) ||
mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(ret)), MP_OBJ_FROM_PTR(&mp_type_StopIteration))) {
return mp_const_none;
}
nlr_raise(ret);
default:
// The only choice left is MP_VM_RETURN_NORMAL which is successful close
return mp_const_none;
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(gen_instance_close_obj, gen_instance_close);
STATIC const mp_rom_map_elem_t gen_instance_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&gen_instance_close_obj) },
{ MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(&gen_instance_send_obj) },
{ MP_ROM_QSTR(MP_QSTR_throw), MP_ROM_PTR(&gen_instance_throw_obj) },
};
STATIC MP_DEFINE_CONST_DICT(gen_instance_locals_dict, gen_instance_locals_dict_table);
const mp_obj_type_t mp_type_gen_instance = {
{ &mp_type_type },
.name = MP_QSTR_generator,
.print = gen_instance_print,
.getiter = mp_identity,
.iternext = gen_instance_iternext,
.locals_dict = (mp_obj_dict_t*)&gen_instance_locals_dict,
};
You can’t perform that action at this time.