// Copyright (c) 2009, Google Inc.
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//
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// ---
// 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_