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8e048d2548
micropython/extmod/moductypes.c
Damien George 8e048d2548 all: Clean up error strings to use lowercase and change cannot to can't. 
Now that error string compression is supported it's more important to have
consistent error string formatting (eg all lowercase English words,
consistent contractions).  This commit cleans up some of the strings to
make them more consistent.
2020-04-13 22:19:37 +10:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2014-2018 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 <assert.h>
#include <string.h>
#include <stdint.h>
#include "py/runtime.h"
#include "py/objtuple.h"
#include "py/binary.h"
#if MICROPY_PY_UCTYPES
/// \module uctypes - Access data structures in memory
///
/// The module allows to define layout of raw data structure (using terms
/// of C language), and then access memory buffers using this definition.
/// The module also provides convenience functions to access memory buffers
/// contained in Python objects or wrap memory buffers in Python objects.
/// \constant UINT8_1 - uint8_t value type
/// \class struct - C-like structure
///
/// Encapsulalation of in-memory data structure. This class doesn't define
/// any methods, only attribute access (for structure fields) and
/// indexing (for pointer and array fields).
///
/// Usage:
///
/// # Define layout of a structure with 2 fields
/// # 0 and 4 are byte offsets of fields from the beginning of struct
/// # they are logically ORed with field type
/// FOO_STRUCT = {"a": 0 | uctypes.UINT32, "b": 4 | uctypes.UINT8}
///
/// # Example memory buffer to access (contained in bytes object)
/// buf = b"\x64\0\0\0\0x14"
///
/// # Create structure object referring to address of
/// # the data in the buffer above
/// s = uctypes.struct(FOO_STRUCT, uctypes.addressof(buf))
///
/// # Access fields
/// print(s.a, s.b)
/// # Result:
/// # 100, 20
#define LAYOUT_LITTLE_ENDIAN (0)
#define LAYOUT_BIG_ENDIAN (1)
#define LAYOUT_NATIVE (2)
#define VAL_TYPE_BITS 4
#define BITF_LEN_BITS 5
#define BITF_OFF_BITS 5
#define OFFSET_BITS 17
#if VAL_TYPE_BITS + BITF_LEN_BITS + BITF_OFF_BITS + OFFSET_BITS != 31
#error Invalid encoding field length
#endif
enum {
UINT8, INT8, UINT16, INT16,
UINT32, INT32, UINT64, INT64,
BFUINT8, BFINT8, BFUINT16, BFINT16,
BFUINT32, BFINT32,
FLOAT32, FLOAT64,
};
#define AGG_TYPE_BITS 2
enum {
STRUCT, PTR, ARRAY,
};
// Here we need to set sign bit right
#define TYPE2SMALLINT(x, nbits) ((((int)x) << (32 - nbits)) >> 1)
#define GET_TYPE(x, nbits) (((x) >> (31 - nbits)) & ((1 << nbits) - 1))
// Bit 0 is "is_signed"
#define GET_SCALAR_SIZE(val_type) (1 << ((val_type) >> 1))
#define VALUE_MASK(type_nbits) ~((int)0x80000000 >> type_nbits)
#define IS_SCALAR_ARRAY(tuple_desc) ((tuple_desc)->len == 2)
// We cannot apply the below to INT8, as their range [-128, 127]
#define IS_SCALAR_ARRAY_OF_BYTES(tuple_desc) (GET_TYPE(MP_OBJ_SMALL_INT_VALUE((tuple_desc)->items[1]), VAL_TYPE_BITS) == UINT8)
// "struct" in uctypes context means "structural", i.e. aggregate, type.
STATIC const mp_obj_type_t uctypes_struct_type;
typedef struct _mp_obj_uctypes_struct_t {
mp_obj_base_t base;
mp_obj_t desc;
byte *addr;
uint32_t flags;
} mp_obj_uctypes_struct_t;
STATIC NORETURN void syntax_error(void) {
mp_raise_TypeError(MP_ERROR_TEXT("syntax error in uctypes descriptor"));
}
STATIC mp_obj_t uctypes_struct_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, 2, 3, false);
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = type;
o->addr = (void *)(uintptr_t)mp_obj_int_get_truncated(args[0]);
o->desc = args[1];
o->flags = LAYOUT_NATIVE;
if (n_args == 3) {
o->flags = mp_obj_get_int(args[2]);
}
return MP_OBJ_FROM_PTR(o);
}
STATIC void uctypes_struct_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_uctypes_struct_t *self = MP_OBJ_TO_PTR(self_in);
const char *typen = "unk";
if (mp_obj_is_type(self->desc, &mp_type_dict)
#if MICROPY_PY_COLLECTIONS_ORDEREDDICT
|| mp_obj_is_type(self->desc, &mp_type_ordereddict)
#endif
) {
typen = "STRUCT";
} else if (mp_obj_is_type(self->desc, &mp_type_tuple)) {
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(self->desc);
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
uint agg_type = GET_TYPE(offset, AGG_TYPE_BITS);
switch (agg_type) {
case PTR:
typen = "PTR";
break;
case ARRAY:
typen = "ARRAY";
break;
}
} else {
typen = "ERROR";
}
mp_printf(print, "<struct %s %p>", typen, self->addr);
}
// Get size of any type descriptor
STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, int layout_type, mp_uint_t *max_field_size);
// Get size of scalar type descriptor
static inline mp_uint_t uctypes_struct_scalar_size(int val_type) {
if (val_type == FLOAT32) {
return 4;
} else {
return GET_SCALAR_SIZE(val_type & 7);
}
}
// Get size of aggregate type descriptor
STATIC mp_uint_t uctypes_struct_agg_size(mp_obj_tuple_t *t, int layout_type, mp_uint_t *max_field_size) {
mp_uint_t total_size = 0;
mp_int_t offset_ = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
mp_uint_t agg_type = GET_TYPE(offset_, AGG_TYPE_BITS);
switch (agg_type) {
case STRUCT:
return uctypes_struct_size(t->items[1], layout_type, max_field_size);
case PTR:
if (sizeof(void *) > *max_field_size) {
*max_field_size = sizeof(void *);
}
return sizeof(void *);
case ARRAY: {
mp_int_t arr_sz = MP_OBJ_SMALL_INT_VALUE(t->items[1]);
uint val_type = GET_TYPE(arr_sz, VAL_TYPE_BITS);
arr_sz &= VALUE_MASK(VAL_TYPE_BITS);
mp_uint_t item_s;
if (t->len == 2) {
// Elements of array are scalar
item_s = GET_SCALAR_SIZE(val_type);
if (item_s > *max_field_size) {
*max_field_size = item_s;
}
} else {
// Elements of array are aggregates
item_s = uctypes_struct_size(t->items[2], layout_type, max_field_size);
}
return item_s * arr_sz;
}
default:
assert(0);
}
return total_size;
}
STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, int layout_type, mp_uint_t *max_field_size) {
if (!mp_obj_is_type(desc_in, &mp_type_dict)
#if MICROPY_PY_COLLECTIONS_ORDEREDDICT
&& !mp_obj_is_type(desc_in, &mp_type_ordereddict)
#endif
) {
if (mp_obj_is_type(desc_in, &mp_type_tuple)) {
return uctypes_struct_agg_size((mp_obj_tuple_t *)MP_OBJ_TO_PTR(desc_in), layout_type, max_field_size);
} else if (mp_obj_is_small_int(desc_in)) {
// We allow sizeof on both type definitions and structures/structure fields,
// but scalar structure field is lowered into native Python int, so all
// type info is lost. So, we cannot say if it's scalar type description,
// or such lowered scalar.
mp_raise_TypeError(MP_ERROR_TEXT("can't unambiguously get sizeof scalar"));
}
syntax_error();
}
mp_obj_dict_t *d = MP_OBJ_TO_PTR(desc_in);
mp_uint_t total_size = 0;
for (mp_uint_t i = 0; i < d->map.alloc; i++) {
if (mp_map_slot_is_filled(&d->map, i)) {
mp_obj_t v = d->map.table[i].value;
if (mp_obj_is_small_int(v)) {
mp_uint_t offset = MP_OBJ_SMALL_INT_VALUE(v);
mp_uint_t val_type = GET_TYPE(offset, VAL_TYPE_BITS);
offset &= VALUE_MASK(VAL_TYPE_BITS);
if (val_type >= BFUINT8 && val_type <= BFINT32) {
offset &= (1 << OFFSET_BITS) - 1;
}
mp_uint_t s = uctypes_struct_scalar_size(val_type);
if (s > *max_field_size) {
*max_field_size = s;
}
if (offset + s > total_size) {
total_size = offset + s;
}
} else {
if (!mp_obj_is_type(v, &mp_type_tuple)) {
syntax_error();
}
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(v);
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
offset &= VALUE_MASK(AGG_TYPE_BITS);
mp_uint_t s = uctypes_struct_agg_size(t, layout_type, max_field_size);
if (offset + s > total_size) {
total_size = offset + s;
}
}
}
}
// Round size up to alignment of biggest field
if (layout_type == LAYOUT_NATIVE) {
total_size = (total_size + *max_field_size - 1) & ~(*max_field_size - 1);
}
return total_size;
}
STATIC mp_obj_t uctypes_struct_sizeof(size_t n_args, const mp_obj_t *args) {
mp_obj_t obj_in = args[0];
mp_uint_t max_field_size = 0;
if (mp_obj_is_type(obj_in, &mp_type_bytearray)) {
return mp_obj_len(obj_in);
}
int layout_type = LAYOUT_NATIVE;
// We can apply sizeof either to structure definition (a dict)
// or to instantiated structure
if (mp_obj_is_type(obj_in, &uctypes_struct_type)) {
if (n_args != 1) {
mp_raise_TypeError(NULL);
}
// Extract structure definition
mp_obj_uctypes_struct_t *obj = MP_OBJ_TO_PTR(obj_in);
obj_in = obj->desc;
layout_type = obj->flags;
} else {
if (n_args == 2) {
layout_type = mp_obj_get_int(args[1]);
}
}
mp_uint_t size = uctypes_struct_size(obj_in, layout_type, &max_field_size);
return MP_OBJ_NEW_SMALL_INT(size);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(uctypes_struct_sizeof_obj, 1, 2, uctypes_struct_sizeof);
static inline mp_obj_t get_unaligned(uint val_type, byte *p, int big_endian) {
char struct_type = big_endian ? '>' : '<';
static const char type2char[16] = "BbHhIiQq------fd";
return mp_binary_get_val(struct_type, type2char[val_type], p, &p);
}
static inline void set_unaligned(uint val_type, byte *p, int big_endian, mp_obj_t val) {
char struct_type = big_endian ? '>' : '<';
static const char type2char[16] = "BbHhIiQq------fd";
mp_binary_set_val(struct_type, type2char[val_type], val, p, &p);
}
static inline mp_uint_t get_aligned_basic(uint val_type, void *p) {
switch (val_type) {
case UINT8:
return *(uint8_t *)p;
case UINT16:
return *(uint16_t *)p;
case UINT32:
return *(uint32_t *)p;
}
assert(0);
return 0;
}
static inline void set_aligned_basic(uint val_type, void *p, mp_uint_t v) {
switch (val_type) {
case UINT8:
*(uint8_t *)p = (uint8_t)v;
return;
case UINT16:
*(uint16_t *)p = (uint16_t)v;
return;
case UINT32:
*(uint32_t *)p = (uint32_t)v;
return;
}
assert(0);
}
STATIC mp_obj_t get_aligned(uint val_type, void *p, mp_int_t index) {
switch (val_type) {
case UINT8:
return MP_OBJ_NEW_SMALL_INT(((uint8_t *)p)[index]);
case INT8:
return MP_OBJ_NEW_SMALL_INT(((int8_t *)p)[index]);
case UINT16:
return MP_OBJ_NEW_SMALL_INT(((uint16_t *)p)[index]);
case INT16:
return MP_OBJ_NEW_SMALL_INT(((int16_t *)p)[index]);
case UINT32:
return mp_obj_new_int_from_uint(((uint32_t *)p)[index]);
case INT32:
return mp_obj_new_int(((int32_t *)p)[index]);
case UINT64:
return mp_obj_new_int_from_ull(((uint64_t *)p)[index]);
case INT64:
return mp_obj_new_int_from_ll(((int64_t *)p)[index]);
#if MICROPY_PY_BUILTINS_FLOAT
case FLOAT32:
return mp_obj_new_float((mp_float_t)((float *)p)[index]);
case FLOAT64:
return mp_obj_new_float((mp_float_t)((double *)p)[index]);
#endif
default:
assert(0);
return MP_OBJ_NULL;
}
}
STATIC void set_aligned(uint val_type, void *p, mp_int_t index, mp_obj_t val) {
#if MICROPY_PY_BUILTINS_FLOAT
if (val_type == FLOAT32 || val_type == FLOAT64) {
mp_float_t v = mp_obj_get_float(val);
if (val_type == FLOAT32) {
((float *)p)[index] = v;
} else {
((double *)p)[index] = v;
}
return;
}
#endif
mp_int_t v = mp_obj_get_int_truncated(val);
switch (val_type) {
case UINT8:
((uint8_t *)p)[index] = (uint8_t)v;
return;
case INT8:
((int8_t *)p)[index] = (int8_t)v;
return;
case UINT16:
((uint16_t *)p)[index] = (uint16_t)v;
return;
case INT16:
((int16_t *)p)[index] = (int16_t)v;
return;
case UINT32:
((uint32_t *)p)[index] = (uint32_t)v;
return;
case INT32:
((int32_t *)p)[index] = (int32_t)v;
return;
case INT64:
case UINT64:
if (sizeof(mp_int_t) == 8) {
((uint64_t *)p)[index] = (uint64_t)v;
} else {
// TODO: Doesn't offer atomic store semantics, but should at least try
set_unaligned(val_type, p, MP_ENDIANNESS_BIG, val);
}
return;
default:
assert(0);
}
}
STATIC mp_obj_t uctypes_struct_attr_op(mp_obj_t self_in, qstr attr, mp_obj_t set_val) {
mp_obj_uctypes_struct_t *self = MP_OBJ_TO_PTR(self_in);
if (!mp_obj_is_type(self->desc, &mp_type_dict)
#if MICROPY_PY_COLLECTIONS_ORDEREDDICT
&& !mp_obj_is_type(self->desc, &mp_type_ordereddict)
#endif
) {
mp_raise_TypeError(MP_ERROR_TEXT("struct: no fields"));
}
mp_obj_t deref = mp_obj_dict_get(self->desc, MP_OBJ_NEW_QSTR(attr));
if (mp_obj_is_small_int(deref)) {
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(deref);
mp_uint_t val_type = GET_TYPE(offset, VAL_TYPE_BITS);
offset &= VALUE_MASK(VAL_TYPE_BITS);
//printf("scalar type=%d offset=%x\n", val_type, offset);
if (val_type <= INT64 || val_type == FLOAT32 || val_type == FLOAT64) {
// printf("size=%d\n", GET_SCALAR_SIZE(val_type));
if (self->flags == LAYOUT_NATIVE) {
if (set_val == MP_OBJ_NULL) {
return get_aligned(val_type, self->addr + offset, 0);
} else {
set_aligned(val_type, self->addr + offset, 0, set_val);
return set_val; // just !MP_OBJ_NULL
}
} else {
if (set_val == MP_OBJ_NULL) {
return get_unaligned(val_type, self->addr + offset, self->flags);
} else {
set_unaligned(val_type, self->addr + offset, self->flags, set_val);
return set_val; // just !MP_OBJ_NULL
}
}
} else if (val_type >= BFUINT8 && val_type <= BFINT32) {
uint bit_offset = (offset >> 17) & 31;
uint bit_len = (offset >> 22) & 31;
offset &= (1 << 17) - 1;
mp_uint_t val;
if (self->flags == LAYOUT_NATIVE) {
val = get_aligned_basic(val_type & 6, self->addr + offset);
} else {
val = mp_binary_get_int(GET_SCALAR_SIZE(val_type & 7), val_type & 1, self->flags, self->addr + offset);
}
if (set_val == MP_OBJ_NULL) {
val >>= bit_offset;
val &= (1 << bit_len) - 1;
// TODO: signed
assert((val_type & 1) == 0);
return mp_obj_new_int(val);
} else {
mp_uint_t set_val_int = (mp_uint_t)mp_obj_get_int(set_val);
mp_uint_t mask = (1 << bit_len) - 1;
set_val_int &= mask;
set_val_int <<= bit_offset;
mask <<= bit_offset;
val = (val & ~mask) | set_val_int;
if (self->flags == LAYOUT_NATIVE) {
set_aligned_basic(val_type & 6, self->addr + offset, val);
} else {
mp_binary_set_int(GET_SCALAR_SIZE(val_type & 7), self->flags == LAYOUT_BIG_ENDIAN,
self->addr + offset, val);
}
return set_val; // just !MP_OBJ_NULL
}
}
assert(0);
return MP_OBJ_NULL;
}
if (!mp_obj_is_type(deref, &mp_type_tuple)) {
syntax_error();
}
if (set_val != MP_OBJ_NULL) {
// Cannot assign to aggregate
syntax_error();
}
mp_obj_tuple_t *sub = MP_OBJ_TO_PTR(deref);
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(sub->items[0]);
mp_uint_t agg_type = GET_TYPE(offset, AGG_TYPE_BITS);
offset &= VALUE_MASK(AGG_TYPE_BITS);
//printf("agg type=%d offset=%x\n", agg_type, offset);
switch (agg_type) {
case STRUCT: {
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = &uctypes_struct_type;
o->desc = sub->items[1];
o->addr = self->addr + offset;
o->flags = self->flags;
return MP_OBJ_FROM_PTR(o);
}
case ARRAY: {
mp_uint_t dummy;
if (IS_SCALAR_ARRAY(sub) && IS_SCALAR_ARRAY_OF_BYTES(sub)) {
return mp_obj_new_bytearray_by_ref(uctypes_struct_agg_size(sub, self->flags, &dummy), self->addr + offset);
}
// Fall thru to return uctypes struct object
}
case PTR: {
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = &uctypes_struct_type;
o->desc = MP_OBJ_FROM_PTR(sub);
o->addr = self->addr + offset;
o->flags = self->flags;
//printf("PTR/ARR base addr=%p\n", o->addr);
return MP_OBJ_FROM_PTR(o);
}
}
// Should be unreachable once all cases are handled
return MP_OBJ_NULL;
}
STATIC void uctypes_struct_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
if (dest[0] == MP_OBJ_NULL) {
// load attribute
mp_obj_t val = uctypes_struct_attr_op(self_in, attr, MP_OBJ_NULL);
dest[0] = val;
} else {
// delete/store attribute
if (uctypes_struct_attr_op(self_in, attr, dest[1]) != MP_OBJ_NULL) {
dest[0] = MP_OBJ_NULL; // indicate success
}
}
}
STATIC mp_obj_t uctypes_struct_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
mp_obj_uctypes_struct_t *self = MP_OBJ_TO_PTR(self_in);
if (value == MP_OBJ_NULL) {
// delete
return MP_OBJ_NULL; // op not supported
} else {
// load / store
if (!mp_obj_is_type(self->desc, &mp_type_tuple)) {
mp_raise_TypeError(MP_ERROR_TEXT("struct: can't index"));
}
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(self->desc);
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
uint agg_type = GET_TYPE(offset, AGG_TYPE_BITS);
mp_int_t index = MP_OBJ_SMALL_INT_VALUE(index_in);
if (agg_type == ARRAY) {
mp_int_t arr_sz = MP_OBJ_SMALL_INT_VALUE(t->items[1]);
uint val_type = GET_TYPE(arr_sz, VAL_TYPE_BITS);
arr_sz &= VALUE_MASK(VAL_TYPE_BITS);
if (index >= arr_sz) {
mp_raise_msg(&mp_type_IndexError, MP_ERROR_TEXT("struct: index out of range"));
}
if (t->len == 2) {
// array of scalars
if (self->flags == LAYOUT_NATIVE) {
if (value == MP_OBJ_SENTINEL) {
return get_aligned(val_type, self->addr, index);
} else {
set_aligned(val_type, self->addr, index, value);
return value; // just !MP_OBJ_NULL
}
} else {
byte *p = self->addr + GET_SCALAR_SIZE(val_type) * index;
if (value == MP_OBJ_SENTINEL) {
return get_unaligned(val_type, p, self->flags);
} else {
set_unaligned(val_type, p, self->flags, value);
return value; // just !MP_OBJ_NULL
}
}
} else if (value == MP_OBJ_SENTINEL) {
mp_uint_t dummy = 0;
mp_uint_t size = uctypes_struct_size(t->items[2], self->flags, &dummy);
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = &uctypes_struct_type;
o->desc = t->items[2];
o->addr = self->addr + size * index;
o->flags = self->flags;
return MP_OBJ_FROM_PTR(o);
} else {
return MP_OBJ_NULL; // op not supported
}
} else if (agg_type == PTR) {
byte *p = *(void **)self->addr;
if (mp_obj_is_small_int(t->items[1])) {
uint val_type = GET_TYPE(MP_OBJ_SMALL_INT_VALUE(t->items[1]), VAL_TYPE_BITS);
return get_aligned(val_type, p, index);
} else {
mp_uint_t dummy = 0;
mp_uint_t size = uctypes_struct_size(t->items[1], self->flags, &dummy);
mp_obj_uctypes_struct_t *o = m_new_obj(mp_obj_uctypes_struct_t);
o->base.type = &uctypes_struct_type;
o->desc = t->items[1];
o->addr = p + size * index;
o->flags = self->flags;
return MP_OBJ_FROM_PTR(o);
}
}
assert(0);
return MP_OBJ_NULL;
}
}
STATIC mp_obj_t uctypes_struct_unary_op(mp_unary_op_t op, mp_obj_t self_in) {
mp_obj_uctypes_struct_t *self = MP_OBJ_TO_PTR(self_in);
switch (op) {
case MP_UNARY_OP_INT:
if (mp_obj_is_type(self->desc, &mp_type_tuple)) {
mp_obj_tuple_t *t = MP_OBJ_TO_PTR(self->desc);
mp_int_t offset = MP_OBJ_SMALL_INT_VALUE(t->items[0]);
uint agg_type = GET_TYPE(offset, AGG_TYPE_BITS);
if (agg_type == PTR) {
byte *p = *(void **)self->addr;
return mp_obj_new_int((mp_int_t)(uintptr_t)p);
}
}
/* fallthru */
default:
return MP_OBJ_NULL; // op not supported
}
}
STATIC mp_int_t uctypes_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
(void)flags;
mp_obj_uctypes_struct_t *self = MP_OBJ_TO_PTR(self_in);
mp_uint_t max_field_size = 0;
mp_uint_t size = uctypes_struct_size(self->desc, self->flags, &max_field_size);
bufinfo->buf = self->addr;
bufinfo->len = size;
bufinfo->typecode = BYTEARRAY_TYPECODE;
return 0;
}
/// \function addressof()
/// Return address of object's data (applies to object providing buffer
/// interface).
STATIC mp_obj_t uctypes_struct_addressof(mp_obj_t buf) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
return mp_obj_new_int((mp_int_t)(uintptr_t)bufinfo.buf);
}
MP_DEFINE_CONST_FUN_OBJ_1(uctypes_struct_addressof_obj, uctypes_struct_addressof);
/// \function bytearray_at()
/// Capture memory at given address of given size as bytearray. Memory is
/// captured by reference (and thus memory pointed by bytearray may change
/// or become invalid at later time). Use bytes_at() to capture by value.
STATIC mp_obj_t uctypes_struct_bytearray_at(mp_obj_t ptr, mp_obj_t size) {
return mp_obj_new_bytearray_by_ref(mp_obj_int_get_truncated(size), (void *)(uintptr_t)mp_obj_int_get_truncated(ptr));
}
MP_DEFINE_CONST_FUN_OBJ_2(uctypes_struct_bytearray_at_obj, uctypes_struct_bytearray_at);
/// \function bytes_at()
/// Capture memory at given address of given size as bytes. Memory is
/// captured by value, i.e. copied. Use bytearray_at() to capture by reference
/// ("zero copy").
STATIC mp_obj_t uctypes_struct_bytes_at(mp_obj_t ptr, mp_obj_t size) {
return mp_obj_new_bytes((void *)(uintptr_t)mp_obj_int_get_truncated(ptr), mp_obj_int_get_truncated(size));
}
MP_DEFINE_CONST_FUN_OBJ_2(uctypes_struct_bytes_at_obj, uctypes_struct_bytes_at);
STATIC const mp_obj_type_t uctypes_struct_type = {
{ &mp_type_type },
.name = MP_QSTR_struct,
.print = uctypes_struct_print,
.make_new = uctypes_struct_make_new,
.attr = uctypes_struct_attr,
.subscr = uctypes_struct_subscr,
.unary_op = uctypes_struct_unary_op,
.buffer_p = { .get_buffer = uctypes_get_buffer },
};
STATIC const mp_rom_map_elem_t mp_module_uctypes_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_uctypes) },
{ MP_ROM_QSTR(MP_QSTR_struct), MP_ROM_PTR(&uctypes_struct_type) },
{ MP_ROM_QSTR(MP_QSTR_sizeof), MP_ROM_PTR(&uctypes_struct_sizeof_obj) },
{ MP_ROM_QSTR(MP_QSTR_addressof), MP_ROM_PTR(&uctypes_struct_addressof_obj) },
{ MP_ROM_QSTR(MP_QSTR_bytes_at), MP_ROM_PTR(&uctypes_struct_bytes_at_obj) },
{ MP_ROM_QSTR(MP_QSTR_bytearray_at), MP_ROM_PTR(&uctypes_struct_bytearray_at_obj) },
/// \moduleref uctypes
/// \constant NATIVE - Native structure layout - native endianness,
/// platform-specific field alignment
{ MP_ROM_QSTR(MP_QSTR_NATIVE), MP_ROM_INT(LAYOUT_NATIVE) },
/// \constant LITTLE_ENDIAN - Little-endian structure layout, tightly packed
/// (no alignment constraints)
{ MP_ROM_QSTR(MP_QSTR_LITTLE_ENDIAN), MP_ROM_INT(LAYOUT_LITTLE_ENDIAN) },
/// \constant BIG_ENDIAN - Big-endian structure layout, tightly packed
/// (no alignment constraints)
{ MP_ROM_QSTR(MP_QSTR_BIG_ENDIAN), MP_ROM_INT(LAYOUT_BIG_ENDIAN) },
/// \constant VOID - void value type, may be used only as pointer target type.
{ MP_ROM_QSTR(MP_QSTR_VOID), MP_ROM_INT(TYPE2SMALLINT(UINT8, VAL_TYPE_BITS)) },
/// \constant UINT8 - uint8_t value type
{ MP_ROM_QSTR(MP_QSTR_UINT8), MP_ROM_INT(TYPE2SMALLINT(UINT8, 4)) },
/// \constant INT8 - int8_t value type
{ MP_ROM_QSTR(MP_QSTR_INT8), MP_ROM_INT(TYPE2SMALLINT(INT8, 4)) },
/// \constant UINT16 - uint16_t value type
{ MP_ROM_QSTR(MP_QSTR_UINT16), MP_ROM_INT(TYPE2SMALLINT(UINT16, 4)) },
/// \constant INT16 - int16_t value type
{ MP_ROM_QSTR(MP_QSTR_INT16), MP_ROM_INT(TYPE2SMALLINT(INT16, 4)) },
/// \constant UINT32 - uint32_t value type
{ MP_ROM_QSTR(MP_QSTR_UINT32), MP_ROM_INT(TYPE2SMALLINT(UINT32, 4)) },
/// \constant INT32 - int32_t value type
{ MP_ROM_QSTR(MP_QSTR_INT32), MP_ROM_INT(TYPE2SMALLINT(INT32, 4)) },
/// \constant UINT64 - uint64_t value type
{ MP_ROM_QSTR(MP_QSTR_UINT64), MP_ROM_INT(TYPE2SMALLINT(UINT64, 4)) },
/// \constant INT64 - int64_t value type
{ MP_ROM_QSTR(MP_QSTR_INT64), MP_ROM_INT(TYPE2SMALLINT(INT64, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BFUINT8), MP_ROM_INT(TYPE2SMALLINT(BFUINT8, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BFINT8), MP_ROM_INT(TYPE2SMALLINT(BFINT8, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BFUINT16), MP_ROM_INT(TYPE2SMALLINT(BFUINT16, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BFINT16), MP_ROM_INT(TYPE2SMALLINT(BFINT16, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BFUINT32), MP_ROM_INT(TYPE2SMALLINT(BFUINT32, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BFINT32), MP_ROM_INT(TYPE2SMALLINT(BFINT32, 4)) },
{ MP_ROM_QSTR(MP_QSTR_BF_POS), MP_ROM_INT(17) },
{ MP_ROM_QSTR(MP_QSTR_BF_LEN), MP_ROM_INT(22) },
#if MICROPY_PY_BUILTINS_FLOAT
{ MP_ROM_QSTR(MP_QSTR_FLOAT32), MP_ROM_INT(TYPE2SMALLINT(FLOAT32, 4)) },
{ MP_ROM_QSTR(MP_QSTR_FLOAT64), MP_ROM_INT(TYPE2SMALLINT(FLOAT64, 4)) },
#endif
#if MICROPY_PY_UCTYPES_NATIVE_C_TYPES
// C native type aliases. These depend on GCC-compatible predefined
// preprocessor macros.
#if __SIZEOF_SHORT__ == 2
{ MP_ROM_QSTR(MP_QSTR_SHORT), MP_ROM_INT(TYPE2SMALLINT(INT16, 4)) },
{ MP_ROM_QSTR(MP_QSTR_USHORT), MP_ROM_INT(TYPE2SMALLINT(UINT16, 4)) },
#endif
#if __SIZEOF_INT__ == 4
{ MP_ROM_QSTR(MP_QSTR_INT), MP_ROM_INT(TYPE2SMALLINT(INT32, 4)) },
{ MP_ROM_QSTR(MP_QSTR_UINT), MP_ROM_INT(TYPE2SMALLINT(UINT32, 4)) },
#endif
#if __SIZEOF_LONG__ == 4
{ MP_ROM_QSTR(MP_QSTR_LONG), MP_ROM_INT(TYPE2SMALLINT(INT32, 4)) },
{ MP_ROM_QSTR(MP_QSTR_ULONG), MP_ROM_INT(TYPE2SMALLINT(UINT32, 4)) },
#elif __SIZEOF_LONG__ == 8
{ MP_ROM_QSTR(MP_QSTR_LONG), MP_ROM_INT(TYPE2SMALLINT(INT64, 4)) },
{ MP_ROM_QSTR(MP_QSTR_ULONG), MP_ROM_INT(TYPE2SMALLINT(UINT64, 4)) },
#endif
#if __SIZEOF_LONG_LONG__ == 8
{ MP_ROM_QSTR(MP_QSTR_LONGLONG), MP_ROM_INT(TYPE2SMALLINT(INT64, 4)) },
{ MP_ROM_QSTR(MP_QSTR_ULONGLONG), MP_ROM_INT(TYPE2SMALLINT(UINT64, 4)) },
#endif
#endif // MICROPY_PY_UCTYPES_NATIVE_C_TYPES
{ MP_ROM_QSTR(MP_QSTR_PTR), MP_ROM_INT(TYPE2SMALLINT(PTR, AGG_TYPE_BITS)) },
{ MP_ROM_QSTR(MP_QSTR_ARRAY), MP_ROM_INT(TYPE2SMALLINT(ARRAY, AGG_TYPE_BITS)) },
};
STATIC MP_DEFINE_CONST_DICT(mp_module_uctypes_globals, mp_module_uctypes_globals_table);
const mp_obj_module_t mp_module_uctypes = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t *)&mp_module_uctypes_globals,
};
#endif
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