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// Copyright (c) 2009, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ---
// Author: Andrew Fikes
//
// Utility class for coalescing sampled stack traces. Not thread-safe.
#ifndef TCMALLOC_STACK_TRACE_TABLE_H_
#define TCMALLOC_STACK_TRACE_TABLE_H_
#include <config.h>
#include "common.h"
namespace tcmalloc {
class PERFTOOLS_DLL_DECL StackTraceTable {
public:
// REQUIRES: L < pageheap_lock
StackTraceTable();
~StackTraceTable();
// Adds stack trace "t" to table.
//
// REQUIRES: L >= pageheap_lock
void AddTrace(const StackTrace& t);
// Returns stack traces formatted per MallocExtension guidelines.
// May return NULL on error. Clears state before returning.
//
// REQUIRES: L < pageheap_lock
void** ReadStackTracesAndClear();
// Exposed for PageHeapAllocator
struct Bucket {
// Key
uintptr_t hash;
StackTrace trace;
// Payload
int count;
Bucket* next;
bool KeyEqual(uintptr_t h, const StackTrace& t) const;
};
// For testing
int depth_total() const { return depth_total_; }
int bucket_total() const { return bucket_total_; }
private:
static const int kHashTableSize = 1 << 14; // => table_ is 128k
bool error_;
int depth_total_;
int bucket_total_;
Bucket** table_;
};
} // namespace tcmalloc
#endif // TCMALLOC_STACK_TRACE_TABLE_H_
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