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/*
* Copyright © 2021 Adrian Johnson
*
* 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.
*
* Author: Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairo-test.h"
#include <cairo.h>
/* Uncomment to enable faulty test data in order to force a
* failure. This allows the error logging path to be tested.
*/
/* #define FORCE_FAILURE 1 */
struct test_data {
uint64_t a;
uint64_t b;
uint64_t result;
cairo_bool_t overflow;
};
#if SIZEOF_SIZE_T == 4
static const struct test_data add_32bit_test_data[] = {
{ 0x00000000, 0x00000000, 0x00000000, 0 },
{ 0x00000001, 0x00000000, 0x00000001, 0 },
{ 0x00000000, 0x00000001, 0x00000001, 0 },
{ 0xffffffff, 0x00000001, 0x00000000, 1 },
{ 0x00000001, 0xffffffff, 0x00000000, 1 },
{ 0xfffffffe, 0x00000001, 0xffffffff, 0 },
{ 0x00000001, 0xfffffffe, 0xffffffff, 0 },
{ 0x12345678, 0x98765432, 0xaaaaaaaa, 0 },
{ 0x80000000, 0x80000000, 0x00000000, 1 },
#if FORCE_FAILURE
{ 0x00000001, 0x00000002, 0x00000004, 1 },
#endif
};
static const struct test_data mul_32bit_test_data[] = {
{ 0x00000000, 0x00000000, 0x00000000, 0 },
{ 0x0000ffff, 0x0000ffff, 0xfffe0001, 0 },
{ 0x00010000, 0x00010000, 0x00000000, 1 },
{ 0x00000002, 0x80000000, 0x00000000, 1 },
{ 0x80000000, 0x00000002, 0x00000000, 1 },
{ 0xffffffff, 0x00000001, 0xffffffff, 0 },
};
#endif
#if SIZEOF_SIZE_T == 8
static const struct test_data add_64bit_test_data[] = {
{ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0 },
{ 0x0000000000000001, 0x0000000000000000, 0x0000000000000001, 0 },
{ 0x0000000000000000, 0x0000000000000001, 0x0000000000000001, 0 },
{ 0xffffffffffffffff, 0x0000000000000001, 0x0000000000000000, 1 },
{ 0x0000000000000001, 0xffffffffffffffff, 0x0000000000000000, 1 },
{ 0x0000000000000001, 0xfffffffffffffffe, 0xffffffffffffffff, 0 },
{ 0xfffffffffffffffe, 0x0000000000000001, 0xffffffffffffffff, 0 },
{ 0x123456789abcdef0, 0x987654320fedcbba, 0xaaaaaaaaaaaaaaaa, 0 },
{ 0x8000000000000000, 0x8000000000000000, 0x0000000000000000, 1 },
#if FORCE_FAILURE
{ 0x0000000000000001, 0x0000000000000002, 0x0000000000000004, 1 },
#endif
};
static const struct test_data mul_64bit_test_data[] = {
{ 0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0 },
{ 0x00000000ffffffff, 0x00000000ffffffff, 0xfffffffe00000001, 0 },
{ 0x0000000100000000, 0x0000000100000000, 0x0000000000000000, 1 },
{ 0x0000000000000002, 0x8000000000000000, 0x0000000000000000, 1 },
{ 0x8000000000000000, 0x0000000000000002, 0x0000000000000000, 1 },
{ 0xffffffffffffffff, 0x0000000000000001, 0xffffffffffffffff, 0 },
};
#endif
static cairo_bool_t
check_if_result_fail (cairo_test_context_t *ctx,
size_t result,
cairo_bool_t overflow,
const struct test_data *data,
const char *func_name)
{
int hex_digits = SIZEOF_SIZE_T * 2;
if (overflow != data->overflow || (!data->overflow && result != data->result)) {
cairo_test_log (ctx, "%s a = 0x%0*llx b = 0x%0*llx result = 0x%0*llx overflow = %d\n",
func_name,
hex_digits,
(unsigned long long)data->a,
hex_digits,
(unsigned long long)data->b,
hex_digits,
(unsigned long long)result,
overflow);
if (data->overflow)
cairo_test_log (ctx, "EXPECTED overflow = 1\n");
else
cairo_test_log (ctx, "EXPECTED result = 0x%0*llx overflow = 0\n",
hex_digits,
(unsigned long long)data->result);
return TRUE;
}
return FALSE;
}
static cairo_test_status_t
preamble (cairo_test_context_t *ctx)
{
int i;
cairo_bool_t overflow;
size_t result;
#if SIZEOF_SIZE_T == 4
const struct test_data *add_data = add_32bit_test_data;
int num_add_tests = ARRAY_LENGTH(add_32bit_test_data);
const struct test_data *mul_data = mul_32bit_test_data;
int num_mul_tests = ARRAY_LENGTH(mul_32bit_test_data);
#elif SIZEOF_SIZE_T == 8
const struct test_data *add_data = add_64bit_test_data;
int num_add_tests = ARRAY_LENGTH(add_64bit_test_data);
const struct test_data *mul_data = mul_64bit_test_data;
int num_mul_tests = ARRAY_LENGTH(mul_64bit_test_data);
#else
cairo_test_log (ctx, "sizeof(size_t) = %lld is not supported by this test\n",
(unsigned long long)sizeof(size_t));
return CAIRO_TEST_UNTESTED;
#endif
/* First check the fallback versions of the overflow functions. */
for (i = 0; i < num_add_tests; i++) {
const struct test_data *data = &add_data[i];
overflow = _cairo_fallback_add_size_t_overflow (data->a, data->b, &result);
if (check_if_result_fail (ctx,
result,
overflow,
data,
"_cairo_fallback_add_size_t_overflow"))
{
return CAIRO_TEST_FAILURE;
}
}
for (i = 0; i < num_mul_tests; i++) {
const struct test_data *data = &mul_data[i];
overflow = _cairo_fallback_mul_size_t_overflow (data->a, data->b, &result);
if (check_if_result_fail (ctx,
result,
overflow,
data,
"_cairo_fallback_mul_size_t_overflow"))
{
return CAIRO_TEST_FAILURE;
}
}
/* Next check the compiler builtins (if available, otherwise the
* fallback versions are tested again). This is to ensure the fallback version
* produces identical results to the compiler builtins.
*/
for (i = 0; i < num_add_tests; i++) {
const struct test_data *data = &add_data[i];
overflow = _cairo_add_size_t_overflow (data->a, data->b, &result);
if (check_if_result_fail (ctx,
result,
overflow,
data,
"_cairo_add_size_t_overflow"))
{
return CAIRO_TEST_FAILURE;
}
}
for (i = 0; i < num_mul_tests; i++) {
const struct test_data *data = &mul_data[i];
overflow = _cairo_mul_size_t_overflow (data->a, data->b, &result);
if (check_if_result_fail (ctx,
result,
overflow,
data,
"_cairo_mul_size_t_overflow"))
{
return CAIRO_TEST_FAILURE;
}
}
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (overflow,
"Test the _cairo_*_size_t_overflow functions.",
"memory", /* keywords */
NULL, /* requirements */
0, 0,
preamble, NULL)
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