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micropython/py/objarray.c
Angus Gratton 4bed614e70 py/objarray: Fix use-after-free if extending a bytearray from itself. 
Two cases, one assigning to a slice.
Closes https://github.com/micropython/micropython/issues/13283

Second is extending a slice from itself, similar logic.

In both cases the problem occurs when m_renew causes realloc to move the
buffer, leaving a dangling pointer behind.

There are more complex and hard to fix cases when either argument is a
memoryview into the buffer, currently resizing to a new address breaks
memoryviews into that object.

Reproducing this bug and confirming the fix was done by running the unix
port under valgrind with GC-aware extensions.

Note in default configurations with GIL this bug exists but has no impact
(the free buffer won't be reused while the function is still executing, and
is no longer referenced after it returns).

Signed-off-by: Angus Gratton <angus@redyak.com.au>
2024-04-22 11:50:52 +10:00

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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 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 <assert.h>
#include <stdint.h>
#include "py/runtime.h"
#include "py/binary.h"
#include "py/objstr.h"
#include "py/objarray.h"
#if MICROPY_PY_ARRAY || MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_BUILTINS_MEMORYVIEW
// About memoryview object: We want to reuse as much code as possible from
// array, and keep the memoryview object 4 words in size so it fits in 1 GC
// block. Also, memoryview must keep a pointer to the base of the buffer so
// that the buffer is not GC'd if the original parent object is no longer
// around (we are assuming that all memoryview'able objects return a pointer
// which points to the start of a GC chunk). Given the above constraints we
// do the following:
// - typecode high bit is set if the buffer is read-write (else read-only)
// - free is the offset in elements to the first item in the memoryview
// - len is the length in elements
// - items points to the start of the original buffer
// Note that we don't handle the case where the original buffer might change
// size due to a resize of the original parent object.
#if MICROPY_PY_BUILTINS_MEMORYVIEW
#define TYPECODE_MASK (0x7f)
#define memview_offset free
#define memview_offset_max ((1LL << MP_OBJ_ARRAY_FREE_SIZE_BITS) - 1)
#else
// make (& TYPECODE_MASK) a null operation if memorview not enabled
#define TYPECODE_MASK (~(size_t)0)
// memview_offset should not be accessed if memoryview is not enabled,
// so not defined to catch errors
#endif
static mp_obj_t array_iterator_new(mp_obj_t array_in, mp_obj_iter_buf_t *iter_buf);
static mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg);
static mp_obj_t array_extend(mp_obj_t self_in, mp_obj_t arg_in);
static mp_int_t array_get_buffer(mp_obj_t o_in, mp_buffer_info_t *bufinfo, mp_uint_t flags);
/******************************************************************************/
// array
#if MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_ARRAY
static void array_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_array_t *o = MP_OBJ_TO_PTR(o_in);
if (o->typecode == BYTEARRAY_TYPECODE) {
mp_print_str(print, "bytearray(b");
mp_str_print_quoted(print, o->items, o->len, true);
} else {
mp_printf(print, "array('%c'", o->typecode);
if (o->len > 0) {
mp_print_str(print, ", [");
for (size_t i = 0; i < o->len; i++) {
if (i > 0) {
mp_print_str(print, ", ");
}
mp_obj_print_helper(print, mp_binary_get_val_array(o->typecode, o->items, i), PRINT_REPR);
}
mp_print_str(print, "]");
}
}
mp_print_str(print, ")");
}
#endif
#if MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_ARRAY
static mp_obj_array_t *array_new(char typecode, size_t n) {
int typecode_size = mp_binary_get_size('@', typecode, NULL);
mp_obj_array_t *o = m_new_obj(mp_obj_array_t);
#if MICROPY_PY_BUILTINS_BYTEARRAY && MICROPY_PY_ARRAY
o->base.type = (typecode == BYTEARRAY_TYPECODE) ? &mp_type_bytearray : &mp_type_array;
#elif MICROPY_PY_BUILTINS_BYTEARRAY
o->base.type = &mp_type_bytearray;
#else
o->base.type = &mp_type_array;
#endif
o->typecode = typecode;
o->free = 0;
o->len = n;
o->items = m_new(byte, typecode_size * o->len);
return o;
}
#endif
#if MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_ARRAY
static mp_obj_t array_construct(char typecode, mp_obj_t initializer) {
// bytearrays can be raw-initialised from anything with the buffer protocol
// other arrays can only be raw-initialised from bytes and bytearray objects
mp_buffer_info_t bufinfo;
if (((MICROPY_PY_BUILTINS_BYTEARRAY
&& typecode == BYTEARRAY_TYPECODE)
|| (MICROPY_PY_ARRAY
&& (mp_obj_is_type(initializer, &mp_type_bytes)
|| (MICROPY_PY_BUILTINS_BYTEARRAY && mp_obj_is_type(initializer, &mp_type_bytearray)))))
&& mp_get_buffer(initializer, &bufinfo, MP_BUFFER_READ)) {
// construct array from raw bytes
// we round-down the len to make it a multiple of sz (CPython raises error)
size_t sz = mp_binary_get_size('@', typecode, NULL);
size_t len = bufinfo.len / sz;
mp_obj_array_t *o = array_new(typecode, len);
memcpy(o->items, bufinfo.buf, len * sz);
return MP_OBJ_FROM_PTR(o);
}
size_t len;
// Try to create array of exact len if initializer len is known
mp_obj_t len_in = mp_obj_len_maybe(initializer);
if (len_in == MP_OBJ_NULL) {
len = 0;
} else {
len = MP_OBJ_SMALL_INT_VALUE(len_in);
}
mp_obj_array_t *array = array_new(typecode, len);
mp_obj_t iterable = mp_getiter(initializer, NULL);
mp_obj_t item;
size_t i = 0;
while ((item = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
if (len == 0) {
array_append(MP_OBJ_FROM_PTR(array), item);
} else {
mp_binary_set_val_array(typecode, array->items, i++, item);
}
}
return MP_OBJ_FROM_PTR(array);
}
#endif
#if MICROPY_PY_ARRAY
static mp_obj_t array_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)type_in;
mp_arg_check_num(n_args, n_kw, 1, 2, false);
// get typecode
const char *typecode = mp_obj_str_get_str(args[0]);
if (n_args == 1) {
// 1 arg: make an empty array
return MP_OBJ_FROM_PTR(array_new(*typecode, 0));
} else {
// 2 args: construct the array from the given object
return array_construct(*typecode, args[1]);
}
}
#endif
#if MICROPY_PY_BUILTINS_BYTEARRAY
static mp_obj_t bytearray_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)type_in;
// Can take 2nd/3rd arg if constructs from str
mp_arg_check_num(n_args, n_kw, 0, 3, false);
if (n_args == 0) {
// no args: construct an empty bytearray
return MP_OBJ_FROM_PTR(array_new(BYTEARRAY_TYPECODE, 0));
} else if (mp_obj_is_int(args[0])) {
// 1 arg, an integer: construct a blank bytearray of that length
mp_uint_t len = mp_obj_get_int(args[0]);
mp_obj_array_t *o = array_new(BYTEARRAY_TYPECODE, len);
memset(o->items, 0, len);
return MP_OBJ_FROM_PTR(o);
} else {
// 1 arg: construct the bytearray from that
if (mp_obj_is_str(args[0]) && n_args == 1) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
// Match bytes_make_new.
mp_raise_TypeError(MP_ERROR_TEXT("wrong number of arguments"));
#else
mp_raise_TypeError(MP_ERROR_TEXT("string argument without an encoding"));
#endif
}
return array_construct(BYTEARRAY_TYPECODE, args[0]);
}
}
#endif
#if MICROPY_PY_BUILTINS_MEMORYVIEW
mp_obj_t mp_obj_new_memoryview(byte typecode, size_t nitems, void *items) {
mp_obj_array_t *self = m_new_obj(mp_obj_array_t);
mp_obj_memoryview_init(self, typecode, 0, nitems, items);
return MP_OBJ_FROM_PTR(self);
}
static mp_obj_t memoryview_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)type_in;
// TODO possibly allow memoryview constructor to take start/stop so that one
// can do memoryview(b, 4, 8) instead of memoryview(b)[4:8] (uses less RAM)
mp_arg_check_num(n_args, n_kw, 1, 1, false);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
mp_obj_array_t *self = MP_OBJ_TO_PTR(mp_obj_new_memoryview(bufinfo.typecode,
bufinfo.len / mp_binary_get_size('@', bufinfo.typecode, NULL),
bufinfo.buf));
// If the input object is a memoryview then need to point the items of the
// new memoryview to the start of the buffer so the GC can trace it.
if (mp_obj_get_type(args[0]) == &mp_type_memoryview) {
mp_obj_array_t *other = MP_OBJ_TO_PTR(args[0]);
self->memview_offset = other->memview_offset;
self->items = other->items;
}
// test if the object can be written to
if (mp_get_buffer(args[0], &bufinfo, MP_BUFFER_RW)) {
self->typecode |= MP_OBJ_ARRAY_TYPECODE_FLAG_RW; // indicate writable buffer
}
return MP_OBJ_FROM_PTR(self);
}
#if MICROPY_PY_BUILTINS_MEMORYVIEW_ITEMSIZE
static void memoryview_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
if (dest[0] != MP_OBJ_NULL) {
return;
}
if (attr == MP_QSTR_itemsize) {
mp_obj_array_t *self = MP_OBJ_TO_PTR(self_in);
dest[0] = MP_OBJ_NEW_SMALL_INT(mp_binary_get_size('@', self->typecode & TYPECODE_MASK, NULL));
}
#if MICROPY_PY_BUILTINS_BYTES_HEX
else {
// Need to forward to locals dict.
dest[1] = MP_OBJ_SENTINEL;
}
#endif
}
#endif
#endif
static mp_obj_t array_unary_op(mp_unary_op_t op, mp_obj_t o_in) {
mp_obj_array_t *o = MP_OBJ_TO_PTR(o_in);
switch (op) {
case MP_UNARY_OP_BOOL:
return mp_obj_new_bool(o->len != 0);
case MP_UNARY_OP_LEN:
return MP_OBJ_NEW_SMALL_INT(o->len);
default:
return MP_OBJ_NULL; // op not supported
}
}
static int typecode_for_comparison(int typecode, bool *is_unsigned) {
if (typecode == BYTEARRAY_TYPECODE) {
typecode = 'B';
}
if (typecode <= 'Z') {
typecode += 32; // to lowercase
*is_unsigned = true;
}
return typecode;
}
static mp_obj_t array_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
mp_obj_array_t *lhs = MP_OBJ_TO_PTR(lhs_in);
switch (op) {
case MP_BINARY_OP_ADD: {
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (lhs->base.type == &mp_type_memoryview) {
return MP_OBJ_NULL; // op not supported
}
#endif
// allow to add anything that has the buffer protocol (extension to CPython)
mp_buffer_info_t lhs_bufinfo;
mp_buffer_info_t rhs_bufinfo;
array_get_buffer(lhs_in, &lhs_bufinfo, MP_BUFFER_READ);
mp_get_buffer_raise(rhs_in, &rhs_bufinfo, MP_BUFFER_READ);
size_t sz = mp_binary_get_size('@', lhs_bufinfo.typecode, NULL);
// convert byte count to element count (in case rhs is not multiple of sz)
size_t rhs_len = rhs_bufinfo.len / sz;
// note: lhs->len is element count of lhs, lhs_bufinfo.len is byte count
mp_obj_array_t *res = array_new(lhs_bufinfo.typecode, lhs->len + rhs_len);
mp_seq_cat((byte *)res->items, lhs_bufinfo.buf, lhs_bufinfo.len, rhs_bufinfo.buf, rhs_len * sz, byte);
return MP_OBJ_FROM_PTR(res);
}
case MP_BINARY_OP_INPLACE_ADD: {
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (lhs->base.type == &mp_type_memoryview) {
return MP_OBJ_NULL; // op not supported
}
#endif
array_extend(lhs_in, rhs_in);
return lhs_in;
}
case MP_BINARY_OP_CONTAINS: {
#if MICROPY_PY_BUILTINS_BYTEARRAY
// Can search string only in bytearray
mp_buffer_info_t lhs_bufinfo;
mp_buffer_info_t rhs_bufinfo;
if (mp_get_buffer(rhs_in, &rhs_bufinfo, MP_BUFFER_READ)) {
if (!mp_obj_is_type(lhs_in, &mp_type_bytearray)) {
return mp_const_false;
}
array_get_buffer(lhs_in, &lhs_bufinfo, MP_BUFFER_READ);
return mp_obj_new_bool(
find_subbytes(lhs_bufinfo.buf, lhs_bufinfo.len, rhs_bufinfo.buf, rhs_bufinfo.len, 1) != NULL);
}
#endif
// Otherwise, can only look for a scalar numeric value in an array
if (mp_obj_is_int(rhs_in) || mp_obj_is_float(rhs_in)) {
mp_raise_NotImplementedError(NULL);
}
return mp_const_false;
}
case MP_BINARY_OP_EQUAL:
case MP_BINARY_OP_LESS:
case MP_BINARY_OP_LESS_EQUAL:
case MP_BINARY_OP_MORE:
case MP_BINARY_OP_MORE_EQUAL: {
mp_buffer_info_t lhs_bufinfo;
mp_buffer_info_t rhs_bufinfo;
array_get_buffer(lhs_in, &lhs_bufinfo, MP_BUFFER_READ);
if (!mp_get_buffer(rhs_in, &rhs_bufinfo, MP_BUFFER_READ)) {
return mp_const_false;
}
// mp_seq_cmp_bytes is used so only compatible representations can be correctly compared.
// The type doesn't matter: array/bytearray/str/bytes all have the same buffer layout, so
// just check if the typecodes are compatible; for testing equality the types should have the
// same code except for signedness, and not be floating point because nan never equals nan.
// For > and < the types should be the same and unsigned.
// Note that typecode_for_comparison always returns lowercase letters to save code size.
// No need for (& TYPECODE_MASK) here: xxx_get_buffer already takes care of that.
bool is_unsigned = false;
const int lhs_code = typecode_for_comparison(lhs_bufinfo.typecode, &is_unsigned);
const int rhs_code = typecode_for_comparison(rhs_bufinfo.typecode, &is_unsigned);
if (lhs_code == rhs_code && lhs_code != 'f' && lhs_code != 'd' && (op == MP_BINARY_OP_EQUAL || is_unsigned)) {
return mp_obj_new_bool(mp_seq_cmp_bytes(op, lhs_bufinfo.buf, lhs_bufinfo.len, rhs_bufinfo.buf, rhs_bufinfo.len));
}
// mp_obj_equal_not_equal treats returning MP_OBJ_NULL as 'fall back to pointer comparison'
// for MP_BINARY_OP_EQUAL but that is incompatible with CPython.
mp_raise_NotImplementedError(NULL);
}
default:
return MP_OBJ_NULL; // op not supported
}
}
#if MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_ARRAY
static mp_obj_t array_append(mp_obj_t self_in, mp_obj_t arg) {
// self is not a memoryview, so we don't need to use (& TYPECODE_MASK)
assert((MICROPY_PY_BUILTINS_BYTEARRAY && mp_obj_is_type(self_in, &mp_type_bytearray))
|| (MICROPY_PY_ARRAY && mp_obj_is_type(self_in, &mp_type_array)));
mp_obj_array_t *self = MP_OBJ_TO_PTR(self_in);
if (self->free == 0) {
size_t item_sz = mp_binary_get_size('@', self->typecode, NULL);
// TODO: alloc policy
self->free = 8;
self->items = m_renew(byte, self->items, item_sz * self->len, item_sz * (self->len + self->free));
mp_seq_clear(self->items, self->len + 1, self->len + self->free, item_sz);
}
mp_binary_set_val_array(self->typecode, self->items, self->len, arg);
// only update length/free if set succeeded
self->len++;
self->free--;
return mp_const_none; // return None, as per CPython
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_obj_array_append_obj, array_append);
static mp_obj_t array_extend(mp_obj_t self_in, mp_obj_t arg_in) {
// self is not a memoryview, so we don't need to use (& TYPECODE_MASK)
assert((MICROPY_PY_BUILTINS_BYTEARRAY && mp_obj_is_type(self_in, &mp_type_bytearray))
|| (MICROPY_PY_ARRAY && mp_obj_is_type(self_in, &mp_type_array)));
mp_obj_array_t *self = MP_OBJ_TO_PTR(self_in);
// allow to extend by anything that has the buffer protocol (extension to CPython)
mp_buffer_info_t arg_bufinfo;
mp_get_buffer_raise(arg_in, &arg_bufinfo, MP_BUFFER_READ);
size_t sz = mp_binary_get_size('@', self->typecode, NULL);
// convert byte count to element count
size_t len = arg_bufinfo.len / sz;
// make sure we have enough room to extend
// TODO: alloc policy; at the moment we go conservative
if (self->free < len) {
self->items = m_renew(byte, self->items, (self->len + self->free) * sz, (self->len + len) * sz);
self->free = 0;
if (self_in == arg_in) {
// Get arg_bufinfo again in case self->items has moved
//
// (Note not possible to handle case that arg_in is a memoryview into self)
mp_get_buffer_raise(arg_in, &arg_bufinfo, MP_BUFFER_READ);
}
} else {
self->free -= len;
}
// extend
mp_seq_copy((byte *)self->items + self->len * sz, arg_bufinfo.buf, len * sz, byte);
self->len += len;
return mp_const_none;
}
MP_DEFINE_CONST_FUN_OBJ_2(mp_obj_array_extend_obj, array_extend);
#endif
static mp_obj_t array_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
if (value == MP_OBJ_NULL) {
// delete item
// TODO implement
// TODO: confirmed that both bytearray and array.array support
// slice deletion
return MP_OBJ_NULL; // op not supported
} else {
mp_obj_array_t *o = MP_OBJ_TO_PTR(self_in);
#if MICROPY_PY_BUILTINS_SLICE
if (mp_obj_is_type(index_in, &mp_type_slice)) {
mp_bound_slice_t slice;
if (!mp_seq_get_fast_slice_indexes(o->len, index_in, &slice)) {
mp_raise_NotImplementedError(MP_ERROR_TEXT("only slices with step=1 (aka None) are supported"));
}
if (value != MP_OBJ_SENTINEL) {
#if MICROPY_PY_ARRAY_SLICE_ASSIGN
// Assign
size_t src_len;
uint8_t *src_items;
size_t src_offs = 0;
size_t item_sz = mp_binary_get_size('@', o->typecode & TYPECODE_MASK, NULL);
if (mp_obj_is_obj(value) && MP_OBJ_TYPE_GET_SLOT_OR_NULL(((mp_obj_base_t *)MP_OBJ_TO_PTR(value))->type, subscr) == array_subscr) {
// value is array, bytearray or memoryview
mp_obj_array_t *src_slice = MP_OBJ_TO_PTR(value);
if (item_sz != mp_binary_get_size('@', src_slice->typecode & TYPECODE_MASK, NULL)) {
compat_error:
mp_raise_ValueError(MP_ERROR_TEXT("lhs and rhs should be compatible"));
}
src_len = src_slice->len;
src_items = src_slice->items;
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (mp_obj_is_type(value, &mp_type_memoryview)) {
src_offs = src_slice->memview_offset * item_sz;
}
#endif
} else if (mp_obj_is_type(value, &mp_type_bytes)) {
if (item_sz != 1) {
goto compat_error;
}
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(value, &bufinfo, MP_BUFFER_READ);
src_len = bufinfo.len;
src_items = bufinfo.buf;
} else {
mp_raise_NotImplementedError(MP_ERROR_TEXT("array/bytes required on right side"));
}
// TODO: check src/dst compat
mp_int_t len_adj = src_len - (slice.stop - slice.start);
uint8_t *dest_items = o->items;
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (o->base.type == &mp_type_memoryview) {
if (!(o->typecode & MP_OBJ_ARRAY_TYPECODE_FLAG_RW)) {
// store to read-only memoryview not allowed
return MP_OBJ_NULL;
}
if (len_adj != 0) {
goto compat_error;
}
dest_items += o->memview_offset * item_sz;
}
#endif
if (len_adj > 0) {
if ((size_t)len_adj > o->free) {
// TODO: alloc policy; at the moment we go conservative
o->items = m_renew(byte, o->items, (o->len + o->free) * item_sz, (o->len + len_adj) * item_sz);
o->free = len_adj;
// m_renew may have moved o->items
if (src_items == dest_items) {
src_items = o->items;
}
dest_items = o->items;
}
mp_seq_replace_slice_grow_inplace(dest_items, o->len,
slice.start, slice.stop, src_items + src_offs, src_len, len_adj, item_sz);
} else {
mp_seq_replace_slice_no_grow(dest_items, o->len,
slice.start, slice.stop, src_items + src_offs, src_len, item_sz);
// Clear "freed" elements at the end of list
// TODO: This is actually only needed for typecode=='O'
mp_seq_clear(dest_items, o->len + len_adj, o->len, item_sz);
// TODO: alloc policy after shrinking
}
o->free -= len_adj;
o->len += len_adj;
return mp_const_none;
#else
return MP_OBJ_NULL; // op not supported
#endif
}
mp_obj_array_t *res;
size_t sz = mp_binary_get_size('@', o->typecode & TYPECODE_MASK, NULL);
assert(sz > 0);
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (o->base.type == &mp_type_memoryview) {
if (slice.start > memview_offset_max) {
mp_raise_msg(&mp_type_OverflowError, MP_ERROR_TEXT("memoryview offset too large"));
}
res = m_new_obj(mp_obj_array_t);
*res = *o;
res->memview_offset += slice.start;
res->len = slice.stop - slice.start;
} else
#endif
{
res = array_new(o->typecode, slice.stop - slice.start);
memcpy(res->items, (uint8_t *)o->items + slice.start * sz, (slice.stop - slice.start) * sz);
}
return MP_OBJ_FROM_PTR(res);
} else
#endif
{
size_t index = mp_get_index(o->base.type, o->len, index_in, false);
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (o->base.type == &mp_type_memoryview) {
index += o->memview_offset;
if (value != MP_OBJ_SENTINEL && !(o->typecode & MP_OBJ_ARRAY_TYPECODE_FLAG_RW)) {
// store to read-only memoryview
return MP_OBJ_NULL;
}
}
#endif
if (value == MP_OBJ_SENTINEL) {
// load
return mp_binary_get_val_array(o->typecode & TYPECODE_MASK, o->items, index);
} else {
// store
mp_binary_set_val_array(o->typecode & TYPECODE_MASK, o->items, index, value);
return mp_const_none;
}
}
}
}
static mp_int_t array_get_buffer(mp_obj_t o_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
mp_obj_array_t *o = MP_OBJ_TO_PTR(o_in);
size_t sz = mp_binary_get_size('@', o->typecode & TYPECODE_MASK, NULL);
bufinfo->buf = o->items;
bufinfo->len = o->len * sz;
bufinfo->typecode = o->typecode & TYPECODE_MASK;
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (o->base.type == &mp_type_memoryview) {
if (!(o->typecode & MP_OBJ_ARRAY_TYPECODE_FLAG_RW) && (flags & MP_BUFFER_WRITE)) {
// read-only memoryview
return 1;
}
bufinfo->buf = (uint8_t *)bufinfo->buf + (size_t)o->memview_offset * sz;
}
#else
(void)flags;
#endif
return 0;
}
#if MICROPY_PY_ARRAY
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_array,
MP_QSTR_array,
MP_TYPE_FLAG_ITER_IS_GETITER,
make_new, array_make_new,
print, array_print,
iter, array_iterator_new,
unary_op, array_unary_op,
binary_op, array_binary_op,
subscr, array_subscr,
buffer, array_get_buffer,
locals_dict, &mp_obj_array_locals_dict
);
#endif
#if MICROPY_PY_BUILTINS_BYTEARRAY
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_bytearray,
MP_QSTR_bytearray,
MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE | MP_TYPE_FLAG_ITER_IS_GETITER,
make_new, bytearray_make_new,
print, array_print,
iter, array_iterator_new,
unary_op, array_unary_op,
binary_op, array_binary_op,
subscr, array_subscr,
buffer, array_get_buffer,
locals_dict, &mp_obj_bytearray_locals_dict
);
#endif
#if MICROPY_PY_BUILTINS_MEMORYVIEW
#if MICROPY_PY_BUILTINS_MEMORYVIEW_ITEMSIZE
#define MEMORYVIEW_TYPE_ATTR attr, memoryview_attr,
#else
#define MEMORYVIEW_TYPE_ATTR
#endif
#if MICROPY_PY_BUILTINS_BYTES_HEX
#define MEMORYVIEW_TYPE_LOCALS_DICT locals_dict, &mp_obj_memoryview_locals_dict,
#else
#define MEMORYVIEW_TYPE_LOCALS_DICT
#endif
MP_DEFINE_CONST_OBJ_TYPE(
mp_type_memoryview,
MP_QSTR_memoryview,
MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE | MP_TYPE_FLAG_ITER_IS_GETITER,
make_new, memoryview_make_new,
iter, array_iterator_new,
unary_op, array_unary_op,
binary_op, array_binary_op,
MEMORYVIEW_TYPE_LOCALS_DICT
MEMORYVIEW_TYPE_ATTR
subscr, array_subscr,
buffer, array_get_buffer
);
#endif // MICROPY_PY_BUILTINS_MEMORYVIEW
/* unused
size_t mp_obj_array_len(mp_obj_t self_in) {
return ((mp_obj_array_t *)self_in)->len;
}
*/
#if MICROPY_PY_BUILTINS_BYTEARRAY
mp_obj_t mp_obj_new_bytearray(size_t n, const void *items) {
mp_obj_array_t *o = array_new(BYTEARRAY_TYPECODE, n);
memcpy(o->items, items, n);
return MP_OBJ_FROM_PTR(o);
}
// Create bytearray which references specified memory area
mp_obj_t mp_obj_new_bytearray_by_ref(size_t n, void *items) {
mp_obj_array_t *o = mp_obj_malloc(mp_obj_array_t, &mp_type_bytearray);
o->typecode = BYTEARRAY_TYPECODE;
o->free = 0;
o->len = n;
o->items = items;
return MP_OBJ_FROM_PTR(o);
}
#endif
/******************************************************************************/
// array iterator
typedef struct _mp_obj_array_it_t {
mp_obj_base_t base;
mp_obj_array_t *array;
size_t offset;
size_t cur;
} mp_obj_array_it_t;
static mp_obj_t array_it_iternext(mp_obj_t self_in) {
mp_obj_array_it_t *self = MP_OBJ_TO_PTR(self_in);
if (self->cur < self->array->len) {
return mp_binary_get_val_array(self->array->typecode & TYPECODE_MASK, self->array->items, self->offset + self->cur++);
} else {
return MP_OBJ_STOP_ITERATION;
}
}
static MP_DEFINE_CONST_OBJ_TYPE(
mp_type_array_it,
MP_QSTR_iterator,
MP_TYPE_FLAG_ITER_IS_ITERNEXT,
iter, array_it_iternext
);
static mp_obj_t array_iterator_new(mp_obj_t array_in, mp_obj_iter_buf_t *iter_buf) {
assert(sizeof(mp_obj_array_t) <= sizeof(mp_obj_iter_buf_t));
mp_obj_array_t *array = MP_OBJ_TO_PTR(array_in);
mp_obj_array_it_t *o = (mp_obj_array_it_t *)iter_buf;
o->base.type = &mp_type_array_it;
o->array = array;
o->offset = 0;
o->cur = 0;
#if MICROPY_PY_BUILTINS_MEMORYVIEW
if (array->base.type == &mp_type_memoryview) {
o->offset = array->memview_offset;
}
#endif
return MP_OBJ_FROM_PTR(o);
}
#endif // MICROPY_PY_ARRAY || MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_BUILTINS_MEMORYVIEW
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