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627 lines (576 loc) · 21.8 KB
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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
*
* 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 <stdint.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include "py/obj.h"
#include "py/objtype.h"
#include "py/objint.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "py/cstack.h"
#include "py/stream.h" // for mp_obj_print
// Allocates an object and also sets type, for mp_obj_malloc{,_var} macros.
MP_NOINLINE void *mp_obj_malloc_helper(size_t num_bytes, const mp_obj_type_t *type) {
mp_obj_base_t *base = (mp_obj_base_t *)m_malloc(num_bytes);
base->type = type;
return base;
}
#if MICROPY_ENABLE_FINALISER
// Allocates an object and also sets type, for mp_obj_malloc{,_var}_with_finaliser macros.
MP_NOINLINE void *mp_obj_malloc_with_finaliser_helper(size_t num_bytes, const mp_obj_type_t *type) {
mp_obj_base_t *base = (mp_obj_base_t *)m_malloc_with_finaliser(num_bytes);
base->type = type;
return base;
}
#endif
const mp_obj_type_t *MICROPY_WRAP_MP_OBJ_GET_TYPE(mp_obj_get_type)(mp_const_obj_t o_in) {
#if MICROPY_OBJ_IMMEDIATE_OBJS && MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A
if (mp_obj_is_obj(o_in)) {
const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
return o->type;
} else {
static const mp_obj_type_t *const types[] = {
NULL, &mp_type_int, &mp_type_str, &mp_type_int,
NULL, &mp_type_int, &mp_type_NoneType, &mp_type_int,
NULL, &mp_type_int, &mp_type_str, &mp_type_int,
NULL, &mp_type_int, &mp_type_bool, &mp_type_int,
};
return types[(uintptr_t)o_in & 0xf];
}
#elif MICROPY_OBJ_IMMEDIATE_OBJS && MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C
if (mp_obj_is_small_int(o_in)) {
return &mp_type_int;
} else if (mp_obj_is_obj(o_in)) {
const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
return o->type;
#if MICROPY_PY_BUILTINS_FLOAT
} else if ((((mp_uint_t)(o_in)) & 0xff800007) != 0x00000006) {
return &mp_type_float;
#endif
} else {
static const mp_obj_type_t *const types[] = {
&mp_type_str, &mp_type_NoneType, &mp_type_str, &mp_type_bool,
};
return types[((uintptr_t)o_in >> 3) & 3];
}
#else
if (mp_obj_is_small_int(o_in)) {
return &mp_type_int;
} else if (mp_obj_is_qstr(o_in)) {
return &mp_type_str;
#if MICROPY_PY_BUILTINS_FLOAT && ( \
MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C || MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_D)
} else if (mp_obj_is_float(o_in)) {
return &mp_type_float;
#endif
#if MICROPY_OBJ_IMMEDIATE_OBJS
} else if (mp_obj_is_immediate_obj(o_in)) {
static const mp_obj_type_t *const types[2] = {&mp_type_NoneType, &mp_type_bool};
return types[MP_OBJ_IMMEDIATE_OBJ_VALUE(o_in) & 1];
#endif
} else {
const mp_obj_base_t *o = MP_OBJ_TO_PTR(o_in);
return o->type;
}
#endif
}
const char *mp_obj_get_type_str(mp_const_obj_t o_in) {
return qstr_str(mp_obj_get_type(o_in)->name);
}
void mp_obj_print_helper(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
// There can be data structures nested too deep, or just recursive
mp_cstack_check();
#ifndef NDEBUG
if (o_in == MP_OBJ_NULL) {
mp_print_str(print, "(nil)");
return;
}
#endif
const mp_obj_type_t *type = mp_obj_get_type(o_in);
if (MP_OBJ_TYPE_HAS_SLOT(type, print)) {
MP_OBJ_TYPE_GET_SLOT(type, print)((mp_print_t *)print, o_in, kind);
} else {
mp_printf(print, "<%q>", (qstr)type->name);
}
}
void mp_obj_print(mp_obj_t o_in, mp_print_kind_t kind) {
mp_obj_print_helper(MP_PYTHON_PRINTER, o_in, kind);
}
// helper function to print an exception with traceback
void mp_obj_print_exception(const mp_print_t *print, mp_obj_t exc) {
if (mp_obj_is_exception_instance(exc)) {
size_t n, *values;
mp_obj_exception_get_traceback(exc, &n, &values);
if (n > 0) {
assert(n % 3 == 0);
mp_print_str(print, "Traceback (most recent call last):\n");
for (int i = n - 3; i >= 0; i -= 3) {
#if MICROPY_ENABLE_SOURCE_LINE
mp_printf(print, " File \"%q\", line %d", values[i], (int)values[i + 1]);
#else
mp_printf(print, " File \"%q\"", values[i]);
#endif
// the block name can be NULL if it's unknown
qstr block = values[i + 2];
if (block == MP_QSTRnull) {
mp_print_str(print, "\n");
} else {
mp_printf(print, ", in %q\n", block);
}
}
}
}
mp_obj_print_helper(print, exc, PRINT_EXC);
mp_print_str(print, "\n");
}
bool mp_obj_is_true(mp_obj_t arg) {
if (arg == mp_const_false) {
return 0;
} else if (arg == mp_const_true) {
return 1;
} else if (arg == mp_const_none) {
return 0;
} else if (mp_obj_is_small_int(arg)) {
if (arg == MP_OBJ_NEW_SMALL_INT(0)) {
return 0;
} else {
return 1;
}
} else {
const mp_obj_type_t *type = mp_obj_get_type(arg);
if (MP_OBJ_TYPE_HAS_SLOT(type, unary_op)) {
mp_obj_t result = MP_OBJ_TYPE_GET_SLOT(type, unary_op)(MP_UNARY_OP_BOOL, arg);
if (result != MP_OBJ_NULL) {
return result == mp_const_true;
}
}
mp_obj_t len = mp_obj_len_maybe(arg);
if (len != MP_OBJ_NULL) {
// obj has a length, truth determined if len != 0
return len != MP_OBJ_NEW_SMALL_INT(0);
} else {
// any other obj is true per Python semantics
return 1;
}
}
}
bool mp_obj_is_callable(mp_obj_t o_in) {
const mp_call_fun_t call = MP_OBJ_TYPE_GET_SLOT_OR_NULL(mp_obj_get_type(o_in), call);
if (call != mp_obj_instance_call) {
return call != NULL;
}
return mp_obj_instance_is_callable(o_in);
}
// This function implements the '==' and '!=' operators.
//
// From the Python language reference:
// (https://docs.python.org/3/reference/expressions.html#not-in)
// "The objects need not have the same type. If both are numbers, they are converted
// to a common type. Otherwise, the == and != operators always consider objects of
// different types to be unequal."
//
// This means that False==0 and True==1 are true expressions.
//
// Furthermore, from the v3.4.2 code for object.c: "Practical amendments: If rich
// comparison returns NotImplemented, == and != are decided by comparing the object
// pointer."
mp_obj_t mp_obj_equal_not_equal(mp_binary_op_t op, mp_obj_t o1, mp_obj_t o2) {
mp_obj_t local_true = (op == MP_BINARY_OP_NOT_EQUAL) ? mp_const_false : mp_const_true;
mp_obj_t local_false = (op == MP_BINARY_OP_NOT_EQUAL) ? mp_const_true : mp_const_false;
int pass_number = 0;
// Shortcut for very common cases
if (o1 == o2 &&
(mp_obj_is_small_int(o1) || !(mp_obj_get_type(o1)->flags & MP_TYPE_FLAG_EQ_NOT_REFLEXIVE))) {
return local_true;
}
// fast path for strings
if (mp_obj_is_str(o1)) {
if (mp_obj_is_str(o2)) {
// both strings, use special function
return mp_obj_str_equal(o1, o2) ? local_true : local_false;
#if MICROPY_PY_STR_BYTES_CMP_WARN
} else if (mp_obj_is_type(o2, &mp_type_bytes)) {
str_bytes_cmp:
mp_warning(MP_WARN_CAT(BytesWarning), "Comparison between bytes and str");
return local_false;
#endif
} else {
goto skip_one_pass;
}
#if MICROPY_PY_STR_BYTES_CMP_WARN
} else if (mp_obj_is_str(o2) && mp_obj_is_type(o1, &mp_type_bytes)) {
// o1 is not a string (else caught above), so the objects are not equal
goto str_bytes_cmp;
#endif
}
// fast path for small ints
if (mp_obj_is_small_int(o1)) {
if (mp_obj_is_small_int(o2)) {
// both SMALL_INT, and not equal if we get here
return local_false;
} else {
goto skip_one_pass;
}
}
// generic type, call binary_op(MP_BINARY_OP_EQUAL)
while (pass_number < 2) {
const mp_obj_type_t *type = mp_obj_get_type(o1);
// If a full equality test is not needed and the other object is a different
// type then we don't need to bother trying the comparison.
if (MP_OBJ_TYPE_HAS_SLOT(type, binary_op) &&
((type->flags & MP_TYPE_FLAG_EQ_CHECKS_OTHER_TYPE) || mp_obj_get_type(o2) == type)) {
// CPython is asymmetric: it will try __eq__ if there's no __ne__ but not the
// other way around. If the class doesn't need a full test we can skip __ne__.
if (op == MP_BINARY_OP_NOT_EQUAL && (type->flags & MP_TYPE_FLAG_EQ_HAS_NEQ_TEST)) {
mp_obj_t r = MP_OBJ_TYPE_GET_SLOT(type, binary_op)(MP_BINARY_OP_NOT_EQUAL, o1, o2);
if (r != MP_OBJ_NULL) {
return r;
}
}
// Try calling __eq__.
mp_obj_t r = MP_OBJ_TYPE_GET_SLOT(type, binary_op)(MP_BINARY_OP_EQUAL, o1, o2);
if (r != MP_OBJ_NULL) {
if (op == MP_BINARY_OP_EQUAL) {
return r;
} else {
return mp_obj_is_true(r) ? local_true : local_false;
}
}
}
skip_one_pass:
// Try the other way around if none of the above worked
++pass_number;
mp_obj_t temp = o1;
o1 = o2;
o2 = temp;
}
// equality not implemented, so fall back to pointer comparison
return (o1 == o2) ? local_true : local_false;
}
bool mp_obj_equal(mp_obj_t o1, mp_obj_t o2) {
return mp_obj_is_true(mp_obj_equal_not_equal(MP_BINARY_OP_EQUAL, o1, o2));
}
mp_int_t mp_obj_get_int(mp_const_obj_t arg) {
// This function essentially performs implicit type conversion to int
// Note that Python does NOT provide implicit type conversion from
// float to int in the core expression language, try some_list[1.0].
mp_int_t val;
if (!mp_obj_get_int_maybe(arg, &val)) {
mp_raise_TypeError_int_conversion(arg);
}
return val;
}
#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
mp_uint_t mp_obj_get_uint(mp_const_obj_t arg) {
if (!mp_obj_is_exact_type(arg, &mp_type_int)) {
mp_obj_t as_int = mp_unary_op(MP_UNARY_OP_INT_MAYBE, (mp_obj_t)arg);
if (as_int == MP_OBJ_NULL) {
mp_raise_TypeError_int_conversion(arg);
}
arg = as_int;
}
return mp_obj_int_get_uint_checked(arg);
}
long long mp_obj_get_ll(mp_const_obj_t arg) {
if (!mp_obj_is_exact_type(arg, &mp_type_int)) {
mp_obj_t as_int = mp_unary_op(MP_UNARY_OP_INT_MAYBE, (mp_obj_t)arg);
if (as_int == MP_OBJ_NULL) {
mp_raise_TypeError_int_conversion(arg);
}
arg = as_int;
}
if (mp_obj_is_small_int(arg)) {
return MP_OBJ_SMALL_INT_VALUE(arg);
} else {
long long res;
mp_obj_int_to_bytes((mp_obj_t)arg, sizeof(res), (byte *)&res, MP_ENDIANNESS_BIG, false, false);
return res;
}
}
#endif
mp_int_t mp_obj_get_int_truncated(mp_const_obj_t arg) {
if (mp_obj_is_int(arg)) {
return mp_obj_int_get_truncated(arg);
} else {
return mp_obj_get_int(arg);
}
}
// returns false if arg is not of integral type
// returns true and sets *value if it is of integral type
// can throw OverflowError if arg is of integral type, but doesn't fit in a mp_int_t
bool mp_obj_get_int_maybe(mp_const_obj_t arg, mp_int_t *value) {
if (arg == mp_const_false) {
*value = 0;
} else if (arg == mp_const_true) {
*value = 1;
} else if (mp_obj_is_small_int(arg)) {
*value = MP_OBJ_SMALL_INT_VALUE(arg);
} else if (mp_obj_is_exact_type(arg, &mp_type_int)) {
*value = mp_obj_int_get_checked(arg);
} else {
arg = mp_unary_op(MP_UNARY_OP_INT_MAYBE, (mp_obj_t)arg);
if (arg != MP_OBJ_NULL) {
*value = mp_obj_int_get_checked(arg);
} else {
return false;
}
}
return true;
}
#if MICROPY_PY_BUILTINS_FLOAT
bool mp_obj_get_float_maybe(mp_obj_t arg, mp_float_t *value) {
mp_float_t val;
if (arg == mp_const_false) {
val = 0;
} else if (arg == mp_const_true) {
val = 1;
} else if (mp_obj_is_small_int(arg)) {
val = (mp_float_t)MP_OBJ_SMALL_INT_VALUE(arg);
#if MICROPY_LONGINT_IMPL != MICROPY_LONGINT_IMPL_NONE
} else if (mp_obj_is_exact_type(arg, &mp_type_int)) {
val = mp_obj_int_as_float_impl(arg);
#endif
} else if (mp_obj_is_float(arg)) {
val = mp_obj_float_get(arg);
} else {
arg = mp_unary_op(MP_UNARY_OP_FLOAT_MAYBE, (mp_obj_t)arg);
if (arg != MP_OBJ_NULL && mp_obj_is_float(arg)) {
val = mp_obj_float_get(arg);
} else {
return false;
}
}
*value = val;
return true;
}
mp_float_t mp_obj_get_float(mp_obj_t arg) {
mp_float_t val;
if (!mp_obj_get_float_maybe(arg, &val)) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("can't convert to float"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("can't convert %s to float"), mp_obj_get_type_str(arg));
#endif
}
return val;
}
#if MICROPY_PY_BUILTINS_COMPLEX
bool mp_obj_get_complex_maybe(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
if (mp_obj_get_float_maybe(arg, real)) {
*imag = 0;
} else if (mp_obj_is_type(arg, &mp_type_complex)) {
mp_obj_complex_get(arg, real, imag);
} else {
arg = mp_unary_op(MP_UNARY_OP_COMPLEX_MAYBE, (mp_obj_t)arg);
if (arg != MP_OBJ_NULL && mp_obj_is_type(arg, &mp_type_complex)) {
mp_obj_complex_get(arg, real, imag);
} else {
return false;
}
}
return true;
}
void mp_obj_get_complex(mp_obj_t arg, mp_float_t *real, mp_float_t *imag) {
if (!mp_obj_get_complex_maybe(arg, real, imag)) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("can't convert to complex"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("can't convert %s to complex"), mp_obj_get_type_str(arg));
#endif
}
}
#endif
#endif
// note: returned value in *items may point to the interior of a GC block
void mp_obj_get_array(mp_obj_t o, size_t *len, mp_obj_t **items) {
if (mp_obj_is_type(o, &mp_type_tuple)) {
mp_obj_tuple_get(o, len, items);
} else if (mp_obj_is_type(o, &mp_type_list)) {
mp_obj_list_get(o, len, items);
} else {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("expected tuple/list"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("object '%s' isn't a tuple or list"), mp_obj_get_type_str(o));
#endif
}
}
// note: returned value in *items may point to the interior of a GC block
void mp_obj_get_array_fixed_n(mp_obj_t o, size_t len, mp_obj_t **items) {
size_t seq_len;
mp_obj_get_array(o, &seq_len, items);
if (seq_len != len) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_ValueError(MP_ERROR_TEXT("tuple/list has wrong length"));
#else
mp_raise_msg_varg(&mp_type_ValueError,
MP_ERROR_TEXT("requested length %d but object has length %d"), (int)len, (int)seq_len);
#endif
}
}
// is_slice determines whether the index is a slice index
size_t mp_get_index(const mp_obj_type_t *type, size_t len, mp_obj_t index, bool is_slice) {
mp_int_t i;
if (mp_obj_is_small_int(index)) {
i = MP_OBJ_SMALL_INT_VALUE(index);
} else if (!mp_obj_get_int_maybe(index, &i)) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("indices must be integers"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("%q indices must be integers, not %s"),
type->name, mp_obj_get_type_str(index));
#endif
}
if (i < 0) {
i += len;
}
if (is_slice) {
if (i < 0) {
i = 0;
} else if ((mp_uint_t)i > len) {
i = len;
}
} else {
if (i < 0 || (mp_uint_t)i >= len) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_msg(&mp_type_IndexError, MP_ERROR_TEXT("index out of range"));
#else
mp_raise_msg_varg(&mp_type_IndexError, MP_ERROR_TEXT("%q index out of range"), type->name);
#endif
}
}
// By this point 0 <= i <= len and so fits in a size_t
return (size_t)i;
}
mp_obj_t mp_obj_id(mp_obj_t o_in) {
mp_int_t id = (mp_int_t)o_in;
if (!mp_obj_is_obj(o_in)) {
return mp_obj_new_int(id);
} else if (id >= 0) {
// Many OSes and CPUs have affinity for putting "user" memories
// into low half of address space, and "system" into upper half.
// We're going to take advantage of that and return small int
// (signed) for such "user" addresses.
return MP_OBJ_NEW_SMALL_INT(id);
} else {
// If that didn't work, well, let's return long int, just as
// a (big) positive value, so it will never clash with the range
// of small int returned in previous case.
return mp_obj_new_int_from_uint((mp_uint_t)id);
}
}
// will raise a TypeError if object has no length
mp_obj_t mp_obj_len(mp_obj_t o_in) {
mp_obj_t len = mp_obj_len_maybe(o_in);
if (len == MP_OBJ_NULL) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("object has no len"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("object of type '%s' has no len()"), mp_obj_get_type_str(o_in));
#endif
} else {
return len;
}
}
// may return MP_OBJ_NULL
mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
if (
#if !MICROPY_PY_BUILTINS_STR_UNICODE
// It's simple - unicode is slow, non-unicode is fast
mp_obj_is_str(o_in) ||
#endif
mp_obj_is_type(o_in, &mp_type_bytes)) {
GET_STR_LEN(o_in, l);
return MP_OBJ_NEW_SMALL_INT(l);
} else {
const mp_obj_type_t *type = mp_obj_get_type(o_in);
if (MP_OBJ_TYPE_HAS_SLOT(type, unary_op)) {
return MP_OBJ_TYPE_GET_SLOT(type, unary_op)(MP_UNARY_OP_LEN, o_in);
} else {
return MP_OBJ_NULL;
}
}
}
mp_obj_t mp_obj_subscr(mp_obj_t base, mp_obj_t index, mp_obj_t value) {
const mp_obj_type_t *type = mp_obj_get_type(base);
if (MP_OBJ_TYPE_HAS_SLOT(type, subscr)) {
mp_obj_t ret = MP_OBJ_TYPE_GET_SLOT(type, subscr)(base, index, value);
if (ret != MP_OBJ_NULL) {
return ret;
}
// TODO: call base classes here?
}
if (value == MP_OBJ_NULL) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("object doesn't support item deletion"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("'%s' object doesn't support item deletion"), mp_obj_get_type_str(base));
#endif
} else if (value == MP_OBJ_SENTINEL) {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("object isn't subscriptable"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("'%s' object isn't subscriptable"), mp_obj_get_type_str(base));
#endif
} else {
#if MICROPY_ERROR_REPORTING <= MICROPY_ERROR_REPORTING_TERSE
mp_raise_TypeError(MP_ERROR_TEXT("object doesn't support item assignment"));
#else
mp_raise_msg_varg(&mp_type_TypeError,
MP_ERROR_TEXT("'%s' object doesn't support item assignment"), mp_obj_get_type_str(base));
#endif
}
}
// Return input argument. Useful as .getiter for objects which are
// their own iterators, etc.
mp_obj_t mp_identity(mp_obj_t self) {
return self;
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_identity_obj, mp_identity);
// mp_obj_t mp_identity_getiter(mp_obj_t self, mp_obj_iter_buf_t *iter_buf) {
// (void)iter_buf;
// return self;
// }
bool mp_get_buffer(mp_obj_t obj, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
const mp_obj_type_t *type = mp_obj_get_type(obj);
if (MP_OBJ_TYPE_HAS_SLOT(type, buffer)
&& MP_OBJ_TYPE_GET_SLOT(type, buffer)(obj, bufinfo, flags & MP_BUFFER_RW) == 0) {
return true;
}
if (flags & MP_BUFFER_RAISE_IF_UNSUPPORTED) {
mp_raise_TypeError(MP_ERROR_TEXT("object with buffer protocol required"));
}
return false;
}