mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-28 16:26:10 +03:00
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
// Copyright (c) 2018 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#ifndef BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_COOKIE_H_
|
|
#define BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_COOKIE_H_
|
|
|
|
#include "base/compiler_specific.h"
|
|
#include "base/logging.h"
|
|
|
|
namespace base {
|
|
namespace internal {
|
|
|
|
#if DCHECK_IS_ON()
|
|
// These two byte values match tcmalloc.
|
|
static const unsigned char kUninitializedByte = 0xAB;
|
|
static const unsigned char kFreedByte = 0xCD;
|
|
static const size_t kCookieSize =
|
|
16; // Handles alignment up to XMM instructions on Intel.
|
|
static const unsigned char kCookieValue[kCookieSize] = {
|
|
0xDE, 0xAD, 0xBE, 0xEF, 0xCA, 0xFE, 0xD0, 0x0D,
|
|
0x13, 0x37, 0xF0, 0x05, 0xBA, 0x11, 0xAB, 0x1E};
|
|
#endif
|
|
|
|
ALWAYS_INLINE void PartitionCookieCheckValue(void* ptr) {
|
|
#if DCHECK_IS_ON()
|
|
unsigned char* cookie_ptr = reinterpret_cast<unsigned char*>(ptr);
|
|
for (size_t i = 0; i < kCookieSize; ++i, ++cookie_ptr)
|
|
DCHECK(*cookie_ptr == kCookieValue[i]);
|
|
#endif
|
|
}
|
|
|
|
ALWAYS_INLINE size_t PartitionCookieSizeAdjustAdd(size_t size) {
|
|
#if DCHECK_IS_ON()
|
|
// Add space for cookies, checking for integer overflow. TODO(palmer):
|
|
// Investigate the performance and code size implications of using
|
|
// CheckedNumeric throughout PA.
|
|
DCHECK(size + (2 * kCookieSize) > size);
|
|
size += 2 * kCookieSize;
|
|
#endif
|
|
return size;
|
|
}
|
|
|
|
ALWAYS_INLINE void* PartitionCookieFreePointerAdjust(void* ptr) {
|
|
#if DCHECK_IS_ON()
|
|
// The value given to the application is actually just after the cookie.
|
|
ptr = static_cast<char*>(ptr) - kCookieSize;
|
|
#endif
|
|
return ptr;
|
|
}
|
|
|
|
ALWAYS_INLINE size_t PartitionCookieSizeAdjustSubtract(size_t size) {
|
|
#if DCHECK_IS_ON()
|
|
// Remove space for cookies.
|
|
DCHECK(size >= 2 * kCookieSize);
|
|
size -= 2 * kCookieSize;
|
|
#endif
|
|
return size;
|
|
}
|
|
|
|
ALWAYS_INLINE void PartitionCookieWriteValue(void* ptr) {
|
|
#if DCHECK_IS_ON()
|
|
unsigned char* cookie_ptr = reinterpret_cast<unsigned char*>(ptr);
|
|
for (size_t i = 0; i < kCookieSize; ++i, ++cookie_ptr)
|
|
*cookie_ptr = kCookieValue[i];
|
|
#endif
|
|
}
|
|
|
|
} // namespace internal
|
|
} // namespace base
|
|
|
|
#endif // BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_COOKIE_H_
|