81ebba7e02
They are sugar for marking function as generator, "yield from" and pep492 python "semantically equivalents" respectively. @dpgeorge was the original author of this patch, but @pohmelie made changes to implement `async for` and `async with`.
476 lines
18 KiB
C
476 lines
18 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <stdio.h>
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#include "py/mpstate.h"
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#include "py/objlist.h"
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#include "py/objstr.h"
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#include "py/objtuple.h"
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#include "py/objtype.h"
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#include "py/runtime.h"
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#include "py/gc.h"
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// Instance of MemoryError exception - needed by mp_malloc_fail
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const mp_obj_exception_t mp_const_MemoryError_obj = {{&mp_type_MemoryError}, 0, 0, NULL, (mp_obj_tuple_t*)&mp_const_empty_tuple_obj};
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// Optionally allocated buffer for storing the first argument of an exception
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// allocated when the heap is locked.
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#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
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# if MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE > 0
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#define mp_emergency_exception_buf_size MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE
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void mp_init_emergency_exception_buf(void) {
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// Nothing to do since the buffer was declared statically. We put this
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// definition here so that the calling code can call this function
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// regardless of how its configured (makes the calling code a bit cleaner).
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}
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#else
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#define mp_emergency_exception_buf_size MP_STATE_VM(mp_emergency_exception_buf_size)
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void mp_init_emergency_exception_buf(void) {
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mp_emergency_exception_buf_size = 0;
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MP_STATE_VM(mp_emergency_exception_buf) = NULL;
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}
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mp_obj_t mp_alloc_emergency_exception_buf(mp_obj_t size_in) {
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mp_int_t size = mp_obj_get_int(size_in);
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void *buf = NULL;
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if (size > 0) {
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buf = m_new(byte, size);
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}
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int old_size = mp_emergency_exception_buf_size;
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void *old_buf = MP_STATE_VM(mp_emergency_exception_buf);
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// Update the 2 variables atomically so that an interrupt can't occur
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// between the assignments.
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mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
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mp_emergency_exception_buf_size = size;
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MP_STATE_VM(mp_emergency_exception_buf) = buf;
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MICROPY_END_ATOMIC_SECTION(atomic_state);
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if (old_buf != NULL) {
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m_del(byte, old_buf, old_size);
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}
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return mp_const_none;
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}
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#endif
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#endif // MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
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// Instance of GeneratorExit exception - needed by generator.close()
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// This would belong to objgenerator.c, but to keep mp_obj_exception_t
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// definition module-private so far, have it here.
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const mp_obj_exception_t mp_const_GeneratorExit_obj = {{&mp_type_GeneratorExit}, 0, 0, NULL, (mp_obj_tuple_t*)&mp_const_empty_tuple_obj};
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STATIC void mp_obj_exception_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
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mp_obj_exception_t *o = MP_OBJ_TO_PTR(o_in);
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mp_print_kind_t k = kind & ~PRINT_EXC_SUBCLASS;
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bool is_subclass = kind & PRINT_EXC_SUBCLASS;
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if (!is_subclass && (k == PRINT_REPR || k == PRINT_EXC)) {
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mp_print_str(print, qstr_str(o->base.type->name));
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}
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if (k == PRINT_EXC) {
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mp_print_str(print, ": ");
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}
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if (k == PRINT_STR || k == PRINT_EXC) {
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if (o->args == NULL || o->args->len == 0) {
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mp_print_str(print, "");
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return;
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} else if (o->args->len == 1) {
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mp_obj_print_helper(print, o->args->items[0], PRINT_STR);
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return;
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}
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}
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mp_obj_tuple_print(print, MP_OBJ_FROM_PTR(o->args), kind);
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}
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mp_obj_t mp_obj_exception_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, false);
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mp_obj_exception_t *o = m_new_obj_var_maybe(mp_obj_exception_t, mp_obj_t, 0);
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if (o == NULL) {
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// Couldn't allocate heap memory; use local data instead.
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o = &MP_STATE_VM(mp_emergency_exception_obj);
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// We can't store any args.
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o->args = (mp_obj_tuple_t*)&mp_const_empty_tuple_obj;
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} else {
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o->args = MP_OBJ_TO_PTR(mp_obj_new_tuple(n_args, args));
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}
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o->base.type = type;
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o->traceback_data = NULL;
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return MP_OBJ_FROM_PTR(o);
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}
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// Get exception "value" - that is, first argument, or None
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mp_obj_t mp_obj_exception_get_value(mp_obj_t self_in) {
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mp_obj_exception_t *self = MP_OBJ_TO_PTR(self_in);
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if (self->args->len == 0) {
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return mp_const_none;
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} else {
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return self->args->items[0];
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}
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}
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STATIC void exception_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
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if (dest[0] != MP_OBJ_NULL) {
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// not load attribute
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return;
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}
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mp_obj_exception_t *self = MP_OBJ_TO_PTR(self_in);
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if (attr == MP_QSTR_args) {
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dest[0] = MP_OBJ_FROM_PTR(self->args);
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} else if (self->base.type == &mp_type_StopIteration && attr == MP_QSTR_value) {
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dest[0] = mp_obj_exception_get_value(self_in);
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}
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}
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STATIC mp_obj_t exc___init__(size_t n_args, const mp_obj_t *args) {
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mp_obj_exception_t *self = MP_OBJ_TO_PTR(args[0]);
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mp_obj_t argst = mp_obj_new_tuple(n_args - 1, args + 1);
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self->args = MP_OBJ_TO_PTR(argst);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(exc___init___obj, 1, MP_OBJ_FUN_ARGS_MAX, exc___init__);
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STATIC const mp_rom_map_elem_t exc_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___init__), MP_ROM_PTR(&exc___init___obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(exc_locals_dict, exc_locals_dict_table);
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const mp_obj_type_t mp_type_BaseException = {
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{ &mp_type_type },
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.name = MP_QSTR_BaseException,
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.print = mp_obj_exception_print,
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.make_new = mp_obj_exception_make_new,
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.attr = exception_attr,
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.locals_dict = (mp_obj_dict_t*)&exc_locals_dict,
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};
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#define MP_DEFINE_EXCEPTION_BASE(base_name) \
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STATIC const mp_rom_obj_tuple_t mp_type_ ## base_name ## _base_tuple = {{&mp_type_tuple}, 1, {MP_ROM_PTR(&mp_type_ ## base_name)}};\
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#define MP_DEFINE_EXCEPTION(exc_name, base_name) \
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const mp_obj_type_t mp_type_ ## exc_name = { \
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{ &mp_type_type }, \
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.name = MP_QSTR_ ## exc_name, \
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.print = mp_obj_exception_print, \
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.make_new = mp_obj_exception_make_new, \
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.attr = exception_attr, \
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.bases_tuple = (mp_obj_tuple_t*)(mp_rom_obj_tuple_t*)&mp_type_ ## base_name ## _base_tuple, \
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};
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// List of all exceptions, arranged as in the table at:
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// http://docs.python.org/3/library/exceptions.html
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MP_DEFINE_EXCEPTION_BASE(BaseException)
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MP_DEFINE_EXCEPTION(SystemExit, BaseException)
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MP_DEFINE_EXCEPTION(KeyboardInterrupt, BaseException)
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MP_DEFINE_EXCEPTION(GeneratorExit, BaseException)
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MP_DEFINE_EXCEPTION(Exception, BaseException)
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MP_DEFINE_EXCEPTION_BASE(Exception)
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#if MICROPY_PY_ASYNC_AWAIT
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MP_DEFINE_EXCEPTION(StopAsyncIteration, Exception)
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#endif
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MP_DEFINE_EXCEPTION(StopIteration, Exception)
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MP_DEFINE_EXCEPTION(ArithmeticError, Exception)
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MP_DEFINE_EXCEPTION_BASE(ArithmeticError)
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//MP_DEFINE_EXCEPTION(FloatingPointError, ArithmeticError)
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MP_DEFINE_EXCEPTION(OverflowError, ArithmeticError)
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MP_DEFINE_EXCEPTION(ZeroDivisionError, ArithmeticError)
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MP_DEFINE_EXCEPTION(AssertionError, Exception)
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MP_DEFINE_EXCEPTION(AttributeError, Exception)
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//MP_DEFINE_EXCEPTION(BufferError, Exception)
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//MP_DEFINE_EXCEPTION(EnvironmentError, Exception) use OSError instead
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MP_DEFINE_EXCEPTION(EOFError, Exception)
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MP_DEFINE_EXCEPTION(ImportError, Exception)
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//MP_DEFINE_EXCEPTION(IOError, Exception) use OSError instead
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MP_DEFINE_EXCEPTION(LookupError, Exception)
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MP_DEFINE_EXCEPTION_BASE(LookupError)
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MP_DEFINE_EXCEPTION(IndexError, LookupError)
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MP_DEFINE_EXCEPTION(KeyError, LookupError)
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MP_DEFINE_EXCEPTION(MemoryError, Exception)
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MP_DEFINE_EXCEPTION(NameError, Exception)
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/*
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MP_DEFINE_EXCEPTION_BASE(NameError)
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MP_DEFINE_EXCEPTION(UnboundLocalError, NameError)
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*/
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MP_DEFINE_EXCEPTION(OSError, Exception)
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#if MICROPY_PY_BUILTINS_TIMEOUTERROR
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MP_DEFINE_EXCEPTION_BASE(OSError)
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MP_DEFINE_EXCEPTION(TimeoutError, OSError)
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#endif
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/*
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MP_DEFINE_EXCEPTION(BlockingIOError, OSError)
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MP_DEFINE_EXCEPTION(ChildProcessError, OSError)
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MP_DEFINE_EXCEPTION(ConnectionError, OSError)
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MP_DEFINE_EXCEPTION(BrokenPipeError, ConnectionError)
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MP_DEFINE_EXCEPTION(ConnectionAbortedError, ConnectionError)
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MP_DEFINE_EXCEPTION(ConnectionRefusedError, ConnectionError)
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MP_DEFINE_EXCEPTION(ConnectionResetError, ConnectionError)
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MP_DEFINE_EXCEPTION(InterruptedError, OSError)
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MP_DEFINE_EXCEPTION(IsADirectoryError, OSError)
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MP_DEFINE_EXCEPTION(NotADirectoryError, OSError)
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MP_DEFINE_EXCEPTION(PermissionError, OSError)
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MP_DEFINE_EXCEPTION(ProcessLookupError, OSError)
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MP_DEFINE_EXCEPTION(FileExistsError, OSError)
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MP_DEFINE_EXCEPTION(FileNotFoundError, OSError)
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MP_DEFINE_EXCEPTION(ReferenceError, Exception)
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*/
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MP_DEFINE_EXCEPTION(RuntimeError, Exception)
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MP_DEFINE_EXCEPTION_BASE(RuntimeError)
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MP_DEFINE_EXCEPTION(NotImplementedError, RuntimeError)
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MP_DEFINE_EXCEPTION(SyntaxError, Exception)
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MP_DEFINE_EXCEPTION_BASE(SyntaxError)
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MP_DEFINE_EXCEPTION(IndentationError, SyntaxError)
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/*
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MP_DEFINE_EXCEPTION_BASE(IndentationError)
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MP_DEFINE_EXCEPTION(TabError, IndentationError)
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*/
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//MP_DEFINE_EXCEPTION(SystemError, Exception)
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MP_DEFINE_EXCEPTION(TypeError, Exception)
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#if MICROPY_EMIT_NATIVE
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MP_DEFINE_EXCEPTION_BASE(TypeError)
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MP_DEFINE_EXCEPTION(ViperTypeError, TypeError)
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#endif
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MP_DEFINE_EXCEPTION(ValueError, Exception)
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#if MICROPY_PY_BUILTINS_STR_UNICODE
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MP_DEFINE_EXCEPTION_BASE(ValueError)
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MP_DEFINE_EXCEPTION(UnicodeError, ValueError)
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//TODO: Implement more UnicodeError subclasses which take arguments
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#endif
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/*
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MP_DEFINE_EXCEPTION(Warning, Exception)
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MP_DEFINE_EXCEPTION_BASE(Warning)
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MP_DEFINE_EXCEPTION(DeprecationWarning, Warning)
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MP_DEFINE_EXCEPTION(PendingDeprecationWarning, Warning)
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MP_DEFINE_EXCEPTION(RuntimeWarning, Warning)
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MP_DEFINE_EXCEPTION(SyntaxWarning, Warning)
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MP_DEFINE_EXCEPTION(UserWarning, Warning)
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MP_DEFINE_EXCEPTION(FutureWarning, Warning)
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MP_DEFINE_EXCEPTION(ImportWarning, Warning)
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MP_DEFINE_EXCEPTION(UnicodeWarning, Warning)
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MP_DEFINE_EXCEPTION(BytesWarning, Warning)
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MP_DEFINE_EXCEPTION(ResourceWarning, Warning)
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*/
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mp_obj_t mp_obj_new_exception(const mp_obj_type_t *exc_type) {
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return mp_obj_new_exception_args(exc_type, 0, NULL);
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}
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// "Optimized" version for common(?) case of having 1 exception arg
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mp_obj_t mp_obj_new_exception_arg1(const mp_obj_type_t *exc_type, mp_obj_t arg) {
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return mp_obj_new_exception_args(exc_type, 1, &arg);
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}
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mp_obj_t mp_obj_new_exception_args(const mp_obj_type_t *exc_type, mp_uint_t n_args, const mp_obj_t *args) {
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assert(exc_type->make_new == mp_obj_exception_make_new);
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return exc_type->make_new(exc_type, n_args, 0, args);
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}
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mp_obj_t mp_obj_new_exception_msg(const mp_obj_type_t *exc_type, const char *msg) {
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return mp_obj_new_exception_msg_varg(exc_type, msg);
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}
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mp_obj_t mp_obj_new_exception_msg_varg(const mp_obj_type_t *exc_type, const char *fmt, ...) {
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// check that the given type is an exception type
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assert(exc_type->make_new == mp_obj_exception_make_new);
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// make exception object
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mp_obj_exception_t *o = m_new_obj_var_maybe(mp_obj_exception_t, mp_obj_t, 0);
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if (o == NULL) {
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// Couldn't allocate heap memory; use local data instead.
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// Unfortunately, we won't be able to format the string...
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o = &MP_STATE_VM(mp_emergency_exception_obj);
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o->base.type = exc_type;
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o->traceback_data = NULL;
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o->args = (mp_obj_tuple_t*)&mp_const_empty_tuple_obj;
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#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
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// If the user has provided a buffer, then we try to create a tuple
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// of length 1, which has a string object and the string data.
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if (mp_emergency_exception_buf_size > (sizeof(mp_obj_tuple_t) + sizeof(mp_obj_str_t) + sizeof(mp_obj_t))) {
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mp_obj_tuple_t *tuple = (mp_obj_tuple_t *)MP_STATE_VM(mp_emergency_exception_buf);
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mp_obj_str_t *str = (mp_obj_str_t *)&tuple->items[1];
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tuple->base.type = &mp_type_tuple;
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tuple->len = 1;
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tuple->items[0] = MP_OBJ_FROM_PTR(str);
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byte *str_data = (byte *)&str[1];
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uint max_len = MP_STATE_VM(mp_emergency_exception_buf) + mp_emergency_exception_buf_size
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- str_data;
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vstr_t vstr;
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vstr_init_fixed_buf(&vstr, max_len, (char *)str_data);
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va_list ap;
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va_start(ap, fmt);
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vstr_vprintf(&vstr, fmt, ap);
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va_end(ap);
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str->base.type = &mp_type_str;
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str->hash = qstr_compute_hash(str_data, str->len);
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str->len = vstr.len;
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str->data = str_data;
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o->args = tuple;
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uint offset = &str_data[str->len] - MP_STATE_VM(mp_emergency_exception_buf);
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offset += sizeof(void *) - 1;
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offset &= ~(sizeof(void *) - 1);
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if ((mp_emergency_exception_buf_size - offset) > (sizeof(o->traceback_data[0]) * 3)) {
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// We have room to store some traceback.
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o->traceback_data = (size_t*)((byte *)MP_STATE_VM(mp_emergency_exception_buf) + offset);
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o->traceback_alloc = (MP_STATE_VM(mp_emergency_exception_buf) + mp_emergency_exception_buf_size - (byte *)o->traceback_data) / sizeof(o->traceback_data[0]);
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o->traceback_len = 0;
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}
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}
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#endif // MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
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} else {
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o->base.type = exc_type;
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o->traceback_data = NULL;
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o->args = MP_OBJ_TO_PTR(mp_obj_new_tuple(1, NULL));
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if (fmt == NULL) {
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// no message
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assert(0);
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} else {
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if (strchr(fmt, '%') == NULL) {
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// no formatting substitutions, avoid allocating vstr.
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o->args->items[0] = mp_obj_new_str(fmt, strlen(fmt), false);
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} else {
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// render exception message and store as .args[0]
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va_list ap;
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vstr_t vstr;
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vstr_init(&vstr, 16);
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va_start(ap, fmt);
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vstr_vprintf(&vstr, fmt, ap);
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va_end(ap);
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o->args->items[0] = mp_obj_new_str_from_vstr(&mp_type_str, &vstr);
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}
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}
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}
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return MP_OBJ_FROM_PTR(o);
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}
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// return true if the given object is an exception type
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bool mp_obj_is_exception_type(mp_obj_t self_in) {
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if (MP_OBJ_IS_TYPE(self_in, &mp_type_type)) {
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// optimisation when self_in is a builtin exception
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mp_obj_type_t *self = MP_OBJ_TO_PTR(self_in);
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if (self->make_new == mp_obj_exception_make_new) {
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return true;
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}
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}
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return mp_obj_is_subclass_fast(self_in, MP_OBJ_FROM_PTR(&mp_type_BaseException));
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}
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// return true if the given object is an instance of an exception type
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bool mp_obj_is_exception_instance(mp_obj_t self_in) {
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return mp_obj_is_exception_type(MP_OBJ_FROM_PTR(mp_obj_get_type(self_in)));
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}
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// Return true if exception (type or instance) is a subclass of given
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// exception type. Assumes exc_type is a subclass of BaseException, as
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// defined by mp_obj_is_exception_type(exc_type).
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bool mp_obj_exception_match(mp_obj_t exc, mp_const_obj_t exc_type) {
|
|
// if exc is an instance of an exception, then extract and use its type
|
|
if (mp_obj_is_exception_instance(exc)) {
|
|
exc = MP_OBJ_FROM_PTR(mp_obj_get_type(exc));
|
|
}
|
|
return mp_obj_is_subclass_fast(exc, exc_type);
|
|
}
|
|
|
|
// traceback handling functions
|
|
|
|
#define GET_NATIVE_EXCEPTION(self, self_in) \
|
|
/* make sure self_in is an exception instance */ \
|
|
assert(mp_obj_is_exception_instance(self_in)); \
|
|
mp_obj_exception_t *self; \
|
|
if (mp_obj_is_native_exception_instance(self_in)) { \
|
|
self = MP_OBJ_TO_PTR(self_in); \
|
|
} else { \
|
|
self = MP_OBJ_TO_PTR(((mp_obj_instance_t*)MP_OBJ_TO_PTR(self_in))->subobj[0]); \
|
|
}
|
|
|
|
void mp_obj_exception_clear_traceback(mp_obj_t self_in) {
|
|
GET_NATIVE_EXCEPTION(self, self_in);
|
|
// just set the traceback to the null object
|
|
// we don't want to call any memory management functions here
|
|
self->traceback_data = NULL;
|
|
}
|
|
|
|
void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, size_t line, qstr block) {
|
|
GET_NATIVE_EXCEPTION(self, self_in);
|
|
|
|
// append this traceback info to traceback data
|
|
// if memory allocation fails (eg because gc is locked), just return
|
|
|
|
if (self->traceback_data == NULL) {
|
|
self->traceback_data = m_new_maybe(size_t, 3);
|
|
if (self->traceback_data == NULL) {
|
|
return;
|
|
}
|
|
self->traceback_alloc = 3;
|
|
self->traceback_len = 0;
|
|
} else if (self->traceback_len + 3 > self->traceback_alloc) {
|
|
// be conservative with growing traceback data
|
|
size_t *tb_data = m_renew_maybe(size_t, self->traceback_data, self->traceback_alloc, self->traceback_alloc + 3, true);
|
|
if (tb_data == NULL) {
|
|
return;
|
|
}
|
|
self->traceback_data = tb_data;
|
|
self->traceback_alloc += 3;
|
|
}
|
|
|
|
size_t *tb_data = &self->traceback_data[self->traceback_len];
|
|
self->traceback_len += 3;
|
|
tb_data[0] = file;
|
|
tb_data[1] = line;
|
|
tb_data[2] = block;
|
|
}
|
|
|
|
void mp_obj_exception_get_traceback(mp_obj_t self_in, size_t *n, size_t **values) {
|
|
GET_NATIVE_EXCEPTION(self, self_in);
|
|
|
|
if (self->traceback_data == NULL) {
|
|
*n = 0;
|
|
*values = NULL;
|
|
} else {
|
|
*n = self->traceback_len;
|
|
*values = self->traceback_data;
|
|
}
|
|
}
|