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circuitpython/py/objexcept.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014-2016 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 <string.h>
#include <stdarg.h>
#include <assert.h>
#include <stdio.h>
#include "py/objlist.h"
#include "py/objstr.h"
#include "py/objtuple.h"
#include "py/objtype.h"
#include "py/runtime.h"
#include "py/gc.h"
#include "py/mperrno.h"
#if MICROPY_ROM_TEXT_COMPRESSION && !defined(NO_QSTR)
// Extract the MP_MAX_UNCOMPRESSED_TEXT_LEN macro from "genhdr/compressed.data.h".
// Only need this if compression enabled and in a regular build (i.e. not during QSTR extraction).
#define MP_MATCH_COMPRESSED(...) // Ignore
#define MP_COMPRESSED_DATA(...) // Ignore
#include "genhdr/compressed.data.h"
#undef MP_MATCH_COMPRESSED
#undef MP_COMPRESSED_DATA
#endif
// Number of items per traceback entry (file, line, block)
#define TRACEBACK_ENTRY_LEN (3)
// Optionally allocated buffer for storing some traceback, the tuple argument,
// and possible string object and data, for when the heap is locked.
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// When used the layout of the emergency exception buffer is:
// - traceback entry (file, line, block)
// - traceback entry (file, line, block)
// - mp_obj_tuple_t object
// - n_args * mp_obj_t for tuple
// - mp_obj_str_t object
// - string data
#define EMG_BUF_TRACEBACK_OFFSET (0)
#define EMG_BUF_TRACEBACK_SIZE (2 * TRACEBACK_ENTRY_LEN * sizeof(size_t))
#define EMG_BUF_TUPLE_OFFSET (EMG_BUF_TRACEBACK_OFFSET + EMG_BUF_TRACEBACK_SIZE)
#define EMG_BUF_TUPLE_SIZE(n_args) (sizeof(mp_obj_tuple_t) + n_args * sizeof(mp_obj_t))
#define EMG_BUF_STR_OFFSET (EMG_BUF_TUPLE_OFFSET + EMG_BUF_TUPLE_SIZE(1))
#define EMG_BUF_STR_BUF_OFFSET (EMG_BUF_STR_OFFSET + sizeof(mp_obj_str_t))
#if MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE > 0
#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
#define mp_emergency_exception_buf_size MP_STATE_VM(mp_emergency_exception_buf_size)
void mp_init_emergency_exception_buf(void) {
mp_emergency_exception_buf_size = 0;
MP_STATE_VM(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_new(byte, size);
}
int old_size = mp_emergency_exception_buf_size;
void *old_buf = MP_STATE_VM(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_STATE_VM(mp_emergency_exception_buf) = buf;
MICROPY_END_ATOMIC_SECTION(atomic_state);
if (old_buf != NULL) {
m_del(byte, old_buf, old_size);
}
return mp_const_none;
}
#endif
#endif // MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
bool mp_obj_is_native_exception_instance(mp_obj_t self_in) {
return MP_OBJ_TYPE_GET_SLOT_OR_NULL(mp_obj_get_type(self_in), make_new) == mp_obj_exception_make_new;
}
mp_obj_exception_t *get_native_exception(mp_obj_t self_in) {
assert(mp_obj_is_exception_instance(self_in));
if (mp_obj_is_native_exception_instance(self_in)) {
return MP_OBJ_TO_PTR(self_in);
} else {
return MP_OBJ_TO_PTR(((mp_obj_instance_t *)MP_OBJ_TO_PTR(self_in))->subobj[0]);
}
}
STATIC void decompress_error_text_maybe(mp_obj_exception_t *o) {
#if MICROPY_ROM_TEXT_COMPRESSION
if (o->args->len == 1 && mp_obj_is_exact_type(o->args->items[0], &mp_type_str)) {
mp_obj_str_t *o_str = MP_OBJ_TO_PTR(o->args->items[0]);
if (MP_IS_COMPRESSED_ROM_STRING(o_str->data)) {
byte *buf = m_new_maybe(byte, MP_MAX_UNCOMPRESSED_TEXT_LEN + 1);
if (!buf) {
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// Try and use the emergency exception buf if enough space is available.
buf = (byte *)((uint8_t *)MP_STATE_VM(mp_emergency_exception_buf) + EMG_BUF_STR_BUF_OFFSET);
size_t avail = (uint8_t *)MP_STATE_VM(mp_emergency_exception_buf) + mp_emergency_exception_buf_size - buf;
if (avail < MP_MAX_UNCOMPRESSED_TEXT_LEN + 1) {
// No way to decompress, fallback to no message text.
o->args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
return;
}
#else
o->args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
return;
#endif
}
mp_decompress_rom_string(buf, (mp_rom_error_text_t)o_str->data);
o_str->data = buf;
o_str->len = strlen((const char *)buf);
o_str->hash = 0;
}
// Lazily compute the string hash.
if (o_str->hash == 0) {
o_str->hash = qstr_compute_hash(o_str->data, o_str->len);
}
}
#endif
}
void mp_obj_exception_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_exception_t *o = MP_OBJ_TO_PTR(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)) {
mp_print_str(print, qstr_str(o->base.type->name));
}
if (k == PRINT_EXC) {
mp_print_str(print, ": ");
}
decompress_error_text_maybe(o);
if (k == PRINT_STR || k == PRINT_EXC) {
if (o->args == NULL || o->args->len == 0) {
mp_print_str(print, "");
return;
}
#if MICROPY_PY_UERRNO
// try to provide a nice OSError error message
if (o->base.type == &mp_type_OSError && o->args->len > 0 && o->args->len < 3 && mp_obj_is_small_int(o->args->items[0])) {
// CIRCUITPY can print a whole string, not just the errno qstr
char decompressed[50];
const char *msg = mp_common_errno_to_str(o->args->items[0], decompressed, sizeof(decompressed));
if (msg != NULL) {
mp_printf(print, "[Errno " INT_FMT "] %s", MP_OBJ_SMALL_INT_VALUE(o->args->items[0]), msg);
if (o->args->len > 1) {
mp_print_str(print, ": ");
mp_obj_print_helper(print, o->args->items[1], PRINT_STR);
}
return;
}
}
#endif
if (o->args->len == 1) {
mp_obj_print_helper(print, o->args->items[0], PRINT_STR);
return;
}
}
mp_obj_tuple_print(print, MP_OBJ_FROM_PTR(o->args), kind);
}
// CIRCUITPY
void mp_obj_exception_initialize0(mp_obj_exception_t *o_exc, const mp_obj_type_t *type) {
o_exc->base.type = type;
o_exc->args = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
mp_obj_exception_clear_traceback(o_exc);
}
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) {
mp_arg_check_num(n_args, n_kw, 0, MP_OBJ_FUN_ARGS_MAX, false);
// Try to allocate memory for the exception, with fallback to emergency exception object
mp_obj_exception_t *o_exc = m_new_obj_maybe(mp_obj_exception_t);
if (o_exc == NULL) {
o_exc = &MP_STATE_VM(mp_emergency_exception_obj);
}
// Populate the exception object
o_exc->base.type = type;
o_exc->traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
mp_obj_tuple_t *o_tuple;
if (n_args == 0) {
// No args, can use the empty tuple straight away
o_tuple = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
} else {
// Try to allocate memory for the tuple containing the args
o_tuple = m_new_obj_var_maybe(mp_obj_tuple_t, mp_obj_t, n_args);
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// If we are called by mp_obj_new_exception_msg_varg then it will have
// reserved room (after the traceback data) for a tuple with 1 element.
// Otherwise we are free to use the whole buffer after the traceback data.
if (o_tuple == NULL && mp_emergency_exception_buf_size >=
(mp_int_t)(EMG_BUF_TUPLE_OFFSET + EMG_BUF_TUPLE_SIZE(n_args))) {
o_tuple = (mp_obj_tuple_t *)
((uint8_t *)MP_STATE_VM(mp_emergency_exception_buf) + EMG_BUF_TUPLE_OFFSET);
}
#endif
if (o_tuple == NULL) {
// No memory for a tuple, fallback to an empty tuple
o_tuple = (mp_obj_tuple_t *)&mp_const_empty_tuple_obj;
} else {
// Have memory for a tuple so populate it
o_tuple->base.type = &mp_type_tuple;
o_tuple->len = n_args;
memcpy(o_tuple->items, args, n_args * sizeof(mp_obj_t));
}
}
// Store the tuple of args in the exception object
o_exc->args = o_tuple;
return MP_OBJ_FROM_PTR(o_exc);
}
// 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 = get_native_exception(self_in);
if (self->args->len == 0) {
return mp_const_none;
} else {
decompress_error_text_maybe(self);
return self->args->items[0];
}
}
void mp_obj_exception_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
mp_obj_exception_t *self = MP_OBJ_TO_PTR(self_in);
if (dest[0] != MP_OBJ_NULL) {
// store/delete attribute
#if MICROPY_CONST_GENERATOREXIT_OBJ
if (self == &mp_static_GeneratorExit_obj) {
mp_raise_AttributeError(MP_ERROR_TEXT("can't set attribute"));
}
#endif
if (attr == MP_QSTR___traceback__) {
if (dest[1] == mp_const_none) {
self->traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
} else {
if (!mp_obj_is_type(dest[1], &mp_type_traceback)) {
mp_raise_TypeError_varg(MP_ERROR_TEXT("%q must be of type %q or %q, not %q"), MP_QSTR___context__, MP_QSTR_traceback, MP_QSTR_None, mp_obj_get_type(dest[1])->name);
}
self->traceback = MP_OBJ_TO_PTR(dest[1]);
}
dest[0] = MP_OBJ_NULL; // indicate success
#if MICROPY_CPYTHON_EXCEPTION_CHAIN
} else if (attr == MP_QSTR___cause__) {
if (dest[1] == mp_const_none) {
self->cause = NULL;
} else if (!mp_obj_is_type(dest[1], &mp_type_BaseException)) {
self->cause = dest[1];
} else {
mp_raise_TypeError_varg(MP_ERROR_TEXT("%q must be of type %q or %q, not %q"), attr, MP_QSTR_BaseException, MP_QSTR_None, mp_obj_get_type(dest[1])->name);
}
self->suppress_context = true;
dest[0] = MP_OBJ_NULL; // indicate success
} else if (attr == MP_QSTR___context__) {
if (dest[1] == mp_const_none) {
self->context = NULL;
} else if (!mp_obj_is_type(dest[1], &mp_type_BaseException)) {
self->context = dest[1];
} else {
mp_raise_TypeError_varg(MP_ERROR_TEXT("%q must be of type %q or %q, not %q"), attr, MP_QSTR_BaseException, MP_QSTR_None, mp_obj_get_type(dest[1])->name);
}
dest[0] = MP_OBJ_NULL; // indicate success
} else if (attr == MP_QSTR___suppress_context__) {
self->suppress_context = mp_obj_is_true(dest[1]);
dest[0] = MP_OBJ_NULL; // indicate success
#endif
}
return;
}
if (attr == MP_QSTR_args) {
decompress_error_text_maybe(self);
dest[0] = MP_OBJ_FROM_PTR(self->args);
} else if (attr == MP_QSTR_value && self->base.type == &mp_type_StopIteration) {
dest[0] = mp_obj_exception_get_value(self_in);
} else if (attr == MP_QSTR___traceback__) {
dest[0] = (self->traceback) ? MP_OBJ_FROM_PTR(self->traceback) : mp_const_none;
#if MICROPY_CPYTHON_EXCEPTION_CHAIN
} else if (attr == MP_QSTR___cause__) {
dest[0] = (self->cause) ? MP_OBJ_FROM_PTR(self->cause) : mp_const_none;
} else if (attr == MP_QSTR___context__) {
dest[0] = (self->context) ? MP_OBJ_FROM_PTR(self->context) : mp_const_none;
} else if (attr == MP_QSTR___suppress_context__) {
dest[0] = mp_obj_new_bool(self->suppress_context);
#endif
#if MICROPY_CPYTHON_COMPAT
} else if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(self->base.type), MP_OBJ_FROM_PTR(&mp_type_OSError))) {
if (attr == MP_QSTR_errno) {
dest[0] = mp_obj_exception_get_value(self_in);
} else if (attr == MP_QSTR_strerror) {
if (self->args->len > 1) {
dest[0] = self->args->items[1];
} else if (self->args->len > 0) {
char decompressed[50];
const char *msg = mp_common_errno_to_str(self->args->items[0], decompressed, sizeof(decompressed));
if (msg != NULL) {
dest[0] = mp_obj_new_str(msg, strlen(msg));
} else {
dest[0] = mp_const_none;
}
} else {
dest[0] = mp_const_none;
}
} else if (attr == MP_QSTR_filename) {
dest[0] = self->args->len > 2 ? self->args->items[2] : mp_const_none;
// skip winerror
} else if (attr == MP_QSTR_filename2) {
dest[0] = self->args->len > 4 ? self->args->items[4] : mp_const_none;
}
#endif
}
}
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_BaseException,
MP_QSTR_BaseException,
MP_TYPE_FLAG_NONE,
make_new, mp_obj_exception_make_new,
print, mp_obj_exception_print,
attr, mp_obj_exception_attr
);
// *FORMAT-OFF*
// List of all exceptions, arranged as in the table at:
// http://docs.python.org/3/library/exceptions.html
MP_DEFINE_EXCEPTION(SystemExit, BaseException)
MP_DEFINE_EXCEPTION(KeyboardInterrupt, BaseException)
// CIRCUITPY
MP_DEFINE_EXCEPTION(ReloadException, BaseException)
MP_DEFINE_EXCEPTION(GeneratorExit, BaseException)
MP_DEFINE_EXCEPTION(Exception, BaseException)
#if MICROPY_PY_ASYNC_AWAIT
MP_DEFINE_EXCEPTION(StopAsyncIteration, Exception)
#endif
MP_DEFINE_EXCEPTION(StopIteration, Exception)
MP_DEFINE_EXCEPTION(ArithmeticError, Exception)
//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(EOFError, Exception)
MP_DEFINE_EXCEPTION(ImportError, Exception)
MP_DEFINE_EXCEPTION(LookupError, Exception)
MP_DEFINE_EXCEPTION(IndexError, LookupError)
MP_DEFINE_EXCEPTION(KeyError, LookupError)
MP_DEFINE_EXCEPTION(MemoryError, Exception)
MP_DEFINE_EXCEPTION(NameError, Exception)
/*
MP_DEFINE_EXCEPTION(UnboundLocalError, NameError)
*/
MP_DEFINE_EXCEPTION(OSError, Exception)
/*
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(NotImplementedError, RuntimeError)
MP_DEFINE_EXCEPTION(SyntaxError, Exception)
MP_DEFINE_EXCEPTION(IndentationError, SyntaxError)
/*
MP_DEFINE_EXCEPTION(TabError, IndentationError)
*/
//MP_DEFINE_EXCEPTION(SystemError, Exception)
MP_DEFINE_EXCEPTION(TypeError, Exception)
#if MICROPY_EMIT_NATIVE
MP_DEFINE_EXCEPTION(ViperTypeError, TypeError)
#endif
MP_DEFINE_EXCEPTION(ValueError, Exception)
#if MICROPY_PY_BUILTINS_STR_UNICODE
MP_DEFINE_EXCEPTION(UnicodeError, ValueError)
//TODO: Implement more UnicodeError subclasses which take arguments
#endif
#if CIRCUITPY_ALARM
MP_DEFINE_EXCEPTION(DeepSleepRequest, BaseException)
#endif
/*
MP_DEFINE_EXCEPTION(Warning, Exception)
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)
*/
// *FORMAT-ON*
mp_obj_t mp_obj_new_exception(const mp_obj_type_t *exc_type) {
assert(MP_OBJ_TYPE_GET_SLOT_OR_NULL(exc_type, make_new) == mp_obj_exception_make_new);
return mp_obj_exception_make_new(exc_type, 0, 0, NULL);
}
mp_obj_t mp_obj_new_exception_args(const mp_obj_type_t *exc_type, size_t n_args, const mp_obj_t *args) {
assert(MP_OBJ_TYPE_GET_SLOT_OR_NULL(exc_type, make_new) == mp_obj_exception_make_new);
return mp_obj_exception_make_new(exc_type, n_args, 0, args);
}
#if MICROPY_ERROR_REPORTING != MICROPY_ERROR_REPORTING_NONE
mp_obj_t mp_obj_new_exception_msg(const mp_obj_type_t *exc_type, const compressed_string_t *msg) {
return mp_obj_new_exception_msg_varg(exc_type, msg);
}
// The following struct and function implement a simple printer that conservatively
// allocates memory and truncates the output data if no more memory can be obtained.
// It leaves room for a null byte at the end of the buffer.
struct _exc_printer_t {
bool allow_realloc;
size_t alloc;
size_t len;
byte *buf;
};
STATIC void exc_add_strn(void *data, const char *str, size_t len) {
struct _exc_printer_t *pr = data;
if (pr->len + len >= pr->alloc) {
// Not enough room for data plus a null byte so try to grow the buffer
if (pr->allow_realloc) {
size_t new_alloc = pr->alloc + len + 16;
byte *new_buf = m_renew_maybe(byte, pr->buf, pr->alloc, new_alloc, true);
if (new_buf == NULL) {
pr->allow_realloc = false;
len = pr->alloc - pr->len - 1;
} else {
pr->alloc = new_alloc;
pr->buf = new_buf;
}
} else {
len = pr->alloc - pr->len - 1;
}
}
memcpy(pr->buf + pr->len, str, len);
pr->len += len;
}
mp_obj_t mp_obj_new_exception_msg_varg(const mp_obj_type_t *exc_type, const compressed_string_t *fmt, ...) {
va_list args;
va_start(args, fmt);
mp_obj_t exc = mp_obj_new_exception_msg_vlist(exc_type, fmt, args);
va_end(args);
return exc;
}
mp_obj_t mp_obj_new_exception_msg_vlist(const mp_obj_type_t *exc_type, const compressed_string_t *fmt, va_list ap) {
assert(fmt != NULL);
// Check that the given type is an exception type
assert(MP_OBJ_TYPE_GET_SLOT_OR_NULL(exc_type, make_new) == mp_obj_exception_make_new);
// Try to allocate memory for the message
mp_obj_str_t *o_str = m_new_obj_maybe(mp_obj_str_t);
size_t o_str_alloc = decompress_length(fmt);
byte *o_str_buf = m_new_maybe(byte, o_str_alloc);
bool used_emg_buf = false;
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// If memory allocation failed and there is an emergency buffer then try to use
// that buffer to store the string object and its data (at least 16 bytes for
// the string data), reserving room at the start for the traceback and 1-tuple.
if ((o_str == NULL || o_str_buf == NULL)
&& mp_emergency_exception_buf_size >= (mp_int_t)(EMG_BUF_STR_OFFSET + sizeof(mp_obj_str_t) + 16)) {
used_emg_buf = true;
o_str = (mp_obj_str_t *)((uint8_t *)MP_STATE_VM(mp_emergency_exception_buf)
+ EMG_BUF_STR_OFFSET);
o_str_buf = (byte *)&o_str[1];
o_str_alloc = (uint8_t *)MP_STATE_VM(mp_emergency_exception_buf)
+ mp_emergency_exception_buf_size - o_str_buf;
}
#endif
if (o_str == NULL) {
// No memory for the string object so create the exception with no args.
// The exception will only have a type and no message (compression is irrelevant).
return mp_obj_exception_make_new(exc_type, 0, 0, NULL);
}
if (o_str_buf == NULL) {
// No memory for the string buffer: the string is compressed so don't add it.
o_str->len = 0;
o_str->data = NULL;
} else {
// We have some memory to format the string.
struct _exc_printer_t exc_pr = {!used_emg_buf, o_str_alloc, 0, o_str_buf};
mp_print_t print = {&exc_pr, exc_add_strn};
mp_vcprintf(&print, fmt, ap);
exc_pr.buf[exc_pr.len] = '\0';
o_str->len = exc_pr.len;
o_str->data = exc_pr.buf;
}
// Create the string object and call mp_obj_exception_make_new to create the exception
o_str->base.type = &mp_type_str;
#if MICROPY_ROM_TEXT_COMPRESSION
o_str->hash = 0; // will be computed only if string object is accessed
#else
o_str->hash = qstr_compute_hash(o_str->data, o_str->len);
#endif
mp_obj_t arg = MP_OBJ_FROM_PTR(o_str);
return mp_obj_exception_make_new(exc_type, 1, 0, &arg);
}
mp_obj_t mp_obj_new_exception_msg_str(const mp_obj_type_t *exc_type, const char *msg) {
assert(msg != NULL);
// Check that the given type is an exception type
assert(MP_OBJ_TYPE_GET_SLOT_OR_NULL(exc_type, make_new) == mp_obj_exception_make_new);
// Try to allocate memory for the message
mp_obj_str_t *o_str = m_new_obj_maybe(mp_obj_str_t);
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
// If memory allocation failed and there is an emergency buffer then try to use
// that buffer to store the string object and its data (at least 16 bytes for
// the string data), reserving room at the start for the traceback and 1-tuple.
if (o_str == NULL
&& mp_emergency_exception_buf_size >= EMG_BUF_STR_OFFSET + sizeof(mp_obj_str_t) + 16) {
o_str = (mp_obj_str_t *)((uint8_t *)MP_STATE_VM(mp_emergency_exception_buf)
+ EMG_BUF_STR_OFFSET);
}
#endif
if (o_str == NULL) {
// No memory for the string object so create the exception with no args
return mp_obj_exception_make_new(exc_type, 0, 0, NULL);
}
// Assume the message is statically allocated.
o_str->len = strlen(msg);
o_str->data = (const byte *)msg;
// Create the string object and call mp_obj_exception_make_new to create the exception
o_str->base.type = &mp_type_str;
o_str->hash = qstr_compute_hash(o_str->data, o_str->len);
mp_obj_t arg = MP_OBJ_FROM_PTR(o_str);
return mp_obj_exception_make_new(exc_type, 1, 0, &arg);
}
#endif
// 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 = MP_OBJ_TO_PTR(self_in);
if (MP_OBJ_TYPE_GET_SLOT_OR_NULL(self, make_new) == mp_obj_exception_make_new) {
return true;
}
}
return mp_obj_is_subclass_fast(self_in, MP_OBJ_FROM_PTR(&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_FROM_PTR(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_FROM_PTR(mp_obj_get_type(exc));
}
return mp_obj_is_subclass_fast(exc, exc_type);
}
// traceback handling functions
void mp_obj_exception_clear_traceback(mp_obj_t self_in) {
mp_obj_exception_t *self = get_native_exception(self_in);
// just set the traceback to the empty traceback object
// we don't want to call any memory management functions here
self->traceback = (mp_obj_traceback_t *)&mp_const_empty_traceback_obj;
#if MICROPY_CPYTHON_EXCEPTION_CHAIN
self->cause = 0;
self->context = 0;
self->suppress_context = false;
self->marked = false;
#endif
}
void mp_obj_exception_add_traceback(mp_obj_t self_in, qstr file, size_t line, qstr block) {
mp_obj_exception_t *self = get_native_exception(self_in);
// append this traceback info to traceback data
// if memory allocation fails (eg because gc is locked), just return
#if MICROPY_PY_SYS_TRACEBACKLIMIT
mp_int_t max_traceback = MP_OBJ_SMALL_INT_VALUE(MP_STATE_VM(sys_mutable[MP_SYS_MUTABLE_TRACEBACKLIMIT]));
if (max_traceback <= 0) {
return;
} else if (self->traceback != NULL && self->traceback->len >= max_traceback * TRACEBACK_ENTRY_LEN) {
self->traceback->len -= TRACEBACK_ENTRY_LEN;
memmove(self->traceback->data, self->traceback->data + TRACEBACK_ENTRY_LEN, self->traceback->len * sizeof(self->traceback->data[0]));
}
#endif
// Try to allocate memory for the traceback, with fallback to emergency traceback object
if (self->traceback == NULL || self->traceback == (mp_obj_traceback_t *)&mp_const_empty_traceback_obj) {
self->traceback = m_new_obj_maybe(mp_obj_traceback_t);
if (self->traceback == NULL) {
self->traceback = &MP_STATE_VM(mp_emergency_traceback_obj);
}
// populate traceback object
*self->traceback = mp_const_empty_traceback_obj;
}
// append the provided 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, TRACEBACK_ENTRY_LEN);
if (self->traceback->data == NULL) {
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
if (mp_emergency_exception_buf_size >= (mp_int_t)(EMG_BUF_TRACEBACK_OFFSET + EMG_BUF_TRACEBACK_SIZE)) {
// There is room in the emergency buffer for traceback data
size_t *tb = (size_t *)((uint8_t *)MP_STATE_VM(mp_emergency_exception_buf)
+ EMG_BUF_TRACEBACK_OFFSET);
self->traceback->data = tb;
self->traceback->alloc = EMG_BUF_TRACEBACK_SIZE / sizeof(size_t);
} else {
// Can't allocate and no room in emergency buffer
return;
}
#else
// Can't allocate
return;
#endif
} else {
// Allocated the traceback data on the heap
self->traceback->alloc = TRACEBACK_ENTRY_LEN;
}
self->traceback->len = 0;
} else if (self->traceback->len + TRACEBACK_ENTRY_LEN > self->traceback->alloc) {
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
if (self->traceback->data == (size_t *)MP_STATE_VM(mp_emergency_exception_buf)) {
// Can't resize the emergency buffer
return;
}
#endif
// be conservative with growing traceback data
size_t *tb_data = m_renew_maybe(size_t, self->traceback->data, self->traceback->alloc,
self->traceback->alloc + TRACEBACK_ENTRY_LEN, true);
if (tb_data == NULL) {
return;
}
self->traceback->data = tb_data;
self->traceback->alloc += TRACEBACK_ENTRY_LEN;
}
size_t *tb_data = &self->traceback->data[self->traceback->len];
self->traceback->len += TRACEBACK_ENTRY_LEN;
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) {
mp_obj_exception_t *self = mp_obj_exception_get_native(self_in);
if (self->traceback == NULL) {
*n = 0;
*values = NULL;
} else {
*n = self->traceback->len;
*values = self->traceback->data;
}
}
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