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- // -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
- // 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>
- #ifdef HAVE_STDINT_H
- #include <stdint.h> // for uintptr_t
- #endif
- #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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