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// 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 THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_COOKIE_H_
#define THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_COOKIE_H_
#include "third_party/base/compiler_specific.h"
#include "third_party/base/logging.h"
namespace pdfium {
namespace base {
namespace internal {
#if DCHECK_IS_ON()
// Handles alignment up to XMM instructions on Intel.
static constexpr size_t kCookieSize = 16;
static constexpr 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
} // namespace pdfium
#endif // THIRD_PARTY_BASE_ALLOCATOR_PARTITION_ALLOCATOR_PARTITION_COOKIE_H_
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