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// Copyright (c) 2007, Google Inc.
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// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: Arun Sharma
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#include "config_for_unittests.h"
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#if defined HAVE_STDINT_H
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#include <stdint.h> // to get uintptr_t
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#elif defined HAVE_INTTYPES_H
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#include <inttypes.h> // another place uintptr_t might be defined
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#include <sys/types.h>
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#include "base/logging.h"
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#include "system-alloc.h"
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class ArraySysAllocator : public SysAllocator {
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// Was this allocator invoked at least once?
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ArraySysAllocator() : SysAllocator() {
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void* Alloc(size_t size, size_t *actual_size, size_t alignment) {
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void *result = &array_[ptr_];
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uintptr_t ptr = reinterpret_cast<uintptr_t>(result);
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// Try to get more memory for alignment
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size_t extra = alignment - (ptr & (alignment-1));
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CHECK_LT(ptr_ + size, kArraySize);
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if ((ptr & (alignment-1)) != 0) {
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ptr += alignment - (ptr & (alignment-1));
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return reinterpret_cast<void *>(ptr);
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void DumpStats(TCMalloc_Printer* printer) {
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static const int kArraySize = 8 * 1024 * 1024;
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char array_[kArraySize];
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// We allocate the next chunk from here
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const int ArraySysAllocator::kArraySize;
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static void TestBasicInvoked() {
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RegisterSystemAllocator(&a, 0);
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// An allocation size that is likely to trigger the system allocator.
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// XXX: this is implementation specific.
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char *p = new char[1024 * 1024];
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// Make sure that our allocator was invoked.
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int main(int argc, char** argv) {