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