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micropython/py/objexcept.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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 <string.h>
#include <stdarg.h>
#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include "mpconfig.h"
#include "nlr.h"
#include "misc.h"
#include "qstr.h"
#include "obj.h"
#include "objlist.h"
#include "objstr.h"
#include "objtuple.h"
#include "objtype.h"
#include "runtime.h"
#include "runtime0.h"
#include "gc.h"
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
mp_obj_tuple_t *args;
} mp_obj_exception_t;
// Instance of MemoryError exception - needed by mp_malloc_fail
const mp_obj_exception_t mp_const_MemoryError_obj = {{&mp_type_MemoryError}, MP_OBJ_NULL, mp_const_empty_tuple};
// Local non-heap memory for allocating an exception when we run out of RAM
STATIC mp_obj_exception_t mp_emergency_exception_obj;
// Optionally allocated buffer for storing the first argument of an exception
// allocated when the heap is locked.
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
# if MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE > 0
STATIC byte mp_emergency_exception_buf[MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE];
#define mp_emergency_exception_buf_size MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE
void mp_init_emergency_exception_buf(void) {
// Nothing to do since the buffer was declared statically. We put this
// definition here so that the calling code can call this function
// regardless of how its configured (makes the calling code a bit cleaner).
}
#else
STATIC mp_int_t mp_emergency_exception_buf_size = 0;
STATIC byte *mp_emergency_exception_buf = NULL;
void mp_init_emergency_exception_buf(void) {
mp_emergency_exception_buf_size = 0;
mp_emergency_exception_buf = NULL;
}
mp_obj_t mp_alloc_emergency_exception_buf(mp_obj_t size_in) {
mp_int_t size = mp_obj_get_int(size_in);
void *buf = NULL;
if (size > 0) {
buf = m_malloc(size);
}
int old_size = mp_emergency_exception_buf_size;
void *old_buf = mp_emergency_exception_buf;
// Update the 2 variables atomically so that an interrupt can't occur
// between the assignments.
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
mp_emergency_exception_buf_size = size;
mp_emergency_exception_buf = buf;
MICROPY_END_ATOMIC_SECTION(atomic_state);
if (old_buf != NULL) {
m_free(old_buf, old_size);
}
return mp_const_none;
}
#endif
#endif // MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// 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.
const mp_obj_exception_t mp_const_GeneratorExit_obj = {{&mp_type_GeneratorExit}, MP_OBJ_NULL, mp_const_empty_tuple};
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) {
mp_obj_exception_t *o = o_in;
mp_print_kind_t k = kind & ~PRINT_EXC_SUBCLASS;
bool is_subclass = kind & PRINT_EXC_SUBCLASS;
if (!is_subclass && (k == PRINT_REPR || k == PRINT_EXC)) {
print(env, "%s", qstr_str(o->base.type->name));
}
if (k == PRINT_EXC) {
print(env, ": ");
}
if (k == PRINT_STR || k == PRINT_EXC) {
if (o->args == NULL || 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;
}
}
mp_obj_tuple_print(print, env, o->args, kind);
}
mp_obj_t mp_obj_exception_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
mp_obj_type_t *type = type_in;
if (n_kw != 0) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "%s does not take keyword arguments", mp_obj_get_type_str(type_in)));
}
mp_obj_exception_t *o = m_new_obj_var_maybe(mp_obj_exception_t, mp_obj_t, 0);
if (o == NULL) {
// Couldn't allocate heap memory; use local data instead.
o = &mp_emergency_exception_obj;
// We can't store any args.
n_args = 0;
o->args = mp_const_empty_tuple;
} else {
o->args = mp_obj_new_tuple(n_args, args);
}
o->base.type = type;
o->traceback = MP_OBJ_NULL;
return o;
}
// 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];
}
}
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) {
dest[0] = mp_obj_exception_get_value(self);
}
}
STATIC mp_obj_t exc___init__(mp_uint_t n_args, const mp_obj_t *args) {
mp_obj_exception_t *self = args[0];
mp_obj_t argst = mp_obj_new_tuple(n_args - 1, args + 1);
self->args = argst;
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(exc___init___obj, 1, MP_OBJ_FUN_ARGS_MAX, exc___init__);
STATIC const mp_map_elem_t exc_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR___init__), (mp_obj_t)&exc___init___obj },
};
STATIC MP_DEFINE_CONST_DICT(exc_locals_dict, exc_locals_dict_table);
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,
.load_attr = exception_load_attr,
.locals_dict = (mp_obj_t)&exc_locals_dict,
};
#define MP_DEFINE_EXCEPTION_BASE(base_name) \
STATIC const mp_obj_tuple_t mp_type_ ## base_name ## _base_tuple = {{&mp_type_tuple}, 1, {(mp_obj_t)&mp_type_ ## base_name}};\
#define MP_DEFINE_EXCEPTION(exc_name, base_name) \
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, \
.load_attr = exception_load_attr, \
.bases_tuple = (mp_obj_t)&mp_type_ ## base_name ## _base_tuple, \
};
// List of all exceptions, arranged as in the table at:
// http://docs.python.org/3/library/exceptions.html
MP_DEFINE_EXCEPTION_BASE(BaseException)
MP_DEFINE_EXCEPTION(SystemExit, BaseException)
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)
//MP_DEFINE_EXCEPTION(FloatingPointError, ArithmeticError)
MP_DEFINE_EXCEPTION(OverflowError, ArithmeticError)
MP_DEFINE_EXCEPTION(ZeroDivisionError, ArithmeticError)
MP_DEFINE_EXCEPTION(AssertionError, Exception)
MP_DEFINE_EXCEPTION(AttributeError, Exception)
//MP_DEFINE_EXCEPTION(BufferError, Exception)
//MP_DEFINE_EXCEPTION(EnvironmentError, Exception) use OSError instead
MP_DEFINE_EXCEPTION(EOFError, Exception)
MP_DEFINE_EXCEPTION(ImportError, Exception)
//MP_DEFINE_EXCEPTION(IOError, Exception) use OSError instead
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)
MP_DEFINE_EXCEPTION(UnboundLocalError, NameError)
*/
MP_DEFINE_EXCEPTION(OSError, Exception)
/*
MP_DEFINE_EXCEPTION_BASE(OSError)
MP_DEFINE_EXCEPTION(BlockingIOError, OSError)
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)
MP_DEFINE_EXCEPTION(TimeoutError, OSError)
MP_DEFINE_EXCEPTION(FileExistsError, OSError)
MP_DEFINE_EXCEPTION(FileNotFoundError, OSError)
MP_DEFINE_EXCEPTION(ReferenceError, Exception)
*/
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)
/*
MP_DEFINE_EXCEPTION_BASE(IndentationError)
MP_DEFINE_EXCEPTION(TabError, IndentationError)
*/
//MP_DEFINE_EXCEPTION(SystemError, Exception)
MP_DEFINE_EXCEPTION(TypeError, Exception)
MP_DEFINE_EXCEPTION(ValueError, Exception)
//TODO: Implement UnicodeErrors which take arguments
/*
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)
*/
mp_obj_t mp_obj_new_exception(const mp_obj_type_t *exc_type) {
return mp_obj_new_exception_args(exc_type, 0, NULL);
}
// "Optimized" version for common(?) case of having 1 exception arg
mp_obj_t mp_obj_new_exception_arg1(const mp_obj_type_t *exc_type, mp_obj_t arg) {
return mp_obj_new_exception_args(exc_type, 1, &arg);
}
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) {
assert(exc_type->make_new == mp_obj_exception_make_new);
return exc_type->make_new((mp_obj_t)exc_type, n_args, 0, args);
}
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);
}
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);
// make exception object
mp_obj_exception_t *o = m_new_obj_var_maybe(mp_obj_exception_t, mp_obj_t, 0);
if (o == NULL) {
// Couldn't allocate heap memory; use local data instead.
// Unfortunately, we won't be able to format the string...
o = &mp_emergency_exception_obj;
o->base.type = exc_type;
o->traceback = MP_OBJ_NULL;
o->args = mp_const_empty_tuple;
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// If the user has provided a buffer, then we try to create a tuple
// of length 1, which has a string object and the string data.
if (mp_emergency_exception_buf_size > (sizeof(mp_obj_tuple_t) + sizeof(mp_obj_str_t) + sizeof(mp_obj_t))) {
mp_obj_tuple_t *tuple = (mp_obj_tuple_t *)mp_emergency_exception_buf;
mp_obj_str_t *str = (mp_obj_str_t *)&tuple->items[1];
tuple->base.type = &mp_type_tuple;
tuple->len = 1;
tuple->items[0] = str;
byte *str_data = (byte *)&str[1];
uint max_len = mp_emergency_exception_buf + mp_emergency_exception_buf_size
- str_data;
va_list ap;
va_start(ap, fmt);
str->len = vsnprintf((char *)str_data, max_len, fmt, ap);
va_end(ap);
str->base.type = &mp_type_str;
str->hash = qstr_compute_hash(str_data, str->len);
str->data = str_data;
o->args = tuple;
uint offset = &str_data[str->len] - mp_emergency_exception_buf;
offset += sizeof(void *) - 1;
offset &= ~(sizeof(void *) - 1);
if ((mp_emergency_exception_buf_size - offset) > (sizeof(mp_obj_list_t) + sizeof(mp_obj_t) * 3)) {
// We have room to store some traceback.
mp_obj_list_t *list = (mp_obj_list_t *)((byte *)mp_emergency_exception_buf + offset);
list->base.type = &mp_type_list;
list->items = (mp_obj_t)&list[1];
list->alloc = (mp_emergency_exception_buf + mp_emergency_exception_buf_size - (byte *)list->items) / sizeof(list->items[0]);
list->len = 0;
o->traceback = list;
}
}
#endif // MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
} else {
o->base.type = exc_type;
o->traceback = MP_OBJ_NULL;
o->args = mp_obj_new_tuple(1, NULL);
if (fmt == NULL) {
// no message
assert(0);
} else {
// render exception message and store as .args[0]
// TODO: optimize bufferbloat
vstr_t *vstr = vstr_new();
va_list ap;
va_start(ap, fmt);
vstr_vprintf(vstr, fmt, ap);
va_end(ap);
o->args->items[0] = mp_obj_new_str(vstr->buf, vstr->len, false);
vstr_free(vstr);
}
}
return o;
}
// 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)) {
// optimisation when self_in is a builtin exception
mp_obj_type_t *self = self_in;
if (self->make_new == mp_obj_exception_make_new) {
return true;
}
}
return mp_obj_is_subclass_fast(self_in, &mp_type_BaseException);
}
// return true if the given object is an instance of an exception type
bool mp_obj_is_exception_instance(mp_obj_t self_in) {
return mp_obj_is_exception_type(mp_obj_get_type(self_in));
}
// Return true if exception (type or instance) is a subclass of given
// exception type. Assumes exc_type is a subclass of BaseException, as
// defined by mp_obj_is_exception_type(exc_type).
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_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 = self_in; \
} else { \
self = ((mp_obj_instance_t*)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 = MP_OBJ_NULL;
}
void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, mp_uint_t line, qstr block) {
GET_NATIVE_EXCEPTION(self, self_in);
#if MICROPY_ENABLE_GC
if (gc_is_locked()) {
if (self->traceback == MP_OBJ_NULL) {
// We can't allocate any memory, and no memory has been
// pre-allocated, so there is nothing else we can do.
return;
}
mp_obj_list_t *list = self->traceback;
if (list->alloc <= (list->len + 3)) {
// There is some preallocated memory, but not enough to store an
// entire record.
return;
}
}
#endif
// 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)(mp_uint_t)file);
mp_obj_list_append(self->traceback, (mp_obj_t)(mp_uint_t)line);
mp_obj_list_append(self->traceback, (mp_obj_t)(mp_uint_t)block);
}
void mp_obj_exception_get_traceback(mp_obj_t self_in, mp_uint_t *n, mp_uint_t **values) {
GET_NATIVE_EXCEPTION(self, self_in);
if (self->traceback == MP_OBJ_NULL) {
*n = 0;
*values = NULL;
} else {
mp_uint_t n2;
mp_obj_list_get(self->traceback, &n2, (mp_obj_t**)values);
*n = n2;
}
}
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