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79 lines
3.5 KiB
C++
79 lines
3.5 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2013, Google Inc.
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// All rights reserved.
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//
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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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// met:
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//
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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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// distribution.
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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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//
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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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// This file defines structs to accumulate memory allocation and deallocation
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// counts. These structs are commonly used for malloc (in HeapProfileTable)
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// and mmap (in MemoryRegionMap).
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// A bucket is data structure for heap profiling to store a pair of a stack
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// trace and counts of (de)allocation. Buckets are stored in a hash table
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// which is declared as "HeapProfileBucket**".
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//
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// A hash value is computed from a stack trace. Collision in the hash table
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// is resolved by separate chaining with linked lists. The links in the list
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// are implemented with the member "HeapProfileBucket* next".
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//
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// A structure of a hash table HeapProfileBucket** bucket_table would be like:
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// bucket_table[0] => NULL
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// bucket_table[1] => HeapProfileBucket() => HeapProfileBucket() => NULL
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// ...
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// bucket_table[i] => HeapProfileBucket() => NULL
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// ...
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// bucket_table[n] => HeapProfileBucket() => NULL
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#ifndef HEAP_PROFILE_STATS_H_
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#define HEAP_PROFILE_STATS_H_
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struct HeapProfileStats {
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// Returns true if the two HeapProfileStats are semantically equal.
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bool Equivalent(const HeapProfileStats& other) const {
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return allocs - frees == other.allocs - other.frees &&
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alloc_size - free_size == other.alloc_size - other.free_size;
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}
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int32 allocs; // Number of allocation calls.
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int32 frees; // Number of free calls.
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int64 alloc_size; // Total size of all allocated objects so far.
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int64 free_size; // Total size of all freed objects so far.
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};
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// Allocation and deallocation statistics per each stack trace.
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struct HeapProfileBucket : public HeapProfileStats {
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// Longest stack trace we record.
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static const int kMaxStackDepth = 32;
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uintptr_t hash; // Hash value of the stack trace.
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int depth; // Depth of stack trace.
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const void** stack; // Stack trace.
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HeapProfileBucket* next; // Next entry in hash-table.
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};
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#endif // HEAP_PROFILE_STATS_H_
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