blob: 970a88a501bca12c4334cfc3b387b0417e03ae02 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
#pragma clang system_header
// Copyright 2022 The TCMalloc Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef TCMALLOC_INTERNAL_OVERFLOW_H_
#define TCMALLOC_INTERNAL_OVERFLOW_H_
#include <cstddef>
#include "absl/base/config.h"
#include "tcmalloc/internal/config.h"
GOOGLE_MALLOC_SECTION_BEGIN
namespace tcmalloc {
namespace tcmalloc_internal {
inline bool MultiplyOverflow(size_t a, size_t b, size_t* out) {
#if ABSL_HAVE_BUILTIN(__builtin_mul_overflow)
return __builtin_mul_overflow(a, b, out);
#else
*out = a * b;
return b != 0 && *out / b != a;
#endif
}
} // namespace tcmalloc_internal
} // namespace tcmalloc
GOOGLE_MALLOC_SECTION_END
#endif // TCMALLOC_INTERNAL_OVERFLOW_H_
|
