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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
#include <config.h>
#include "stack_trace_table.h"
#include <string.h> // for NULL, memset
#include "base/spinlock.h" // for SpinLockHolder
#include "common.h" // for StackTrace
#include "internal_logging.h" // for ASSERT, Log
#include "page_heap_allocator.h" // for PageHeapAllocator
#include "static_vars.h" // for Static
namespace tcmalloc {
bool StackTraceTable::Bucket::KeyEqual(uintptr_t h,
const StackTrace& t) const {
const bool eq = (this->hash == h && this->trace.depth == t.depth);
for (int i = 0; eq && i < t.depth; ++i) {
if (this->trace.stack[i] != t.stack[i]) {
return false;
}
}
return eq;
}
StackTraceTable::StackTraceTable()
: error_(false),
depth_total_(0),
bucket_total_(0),
table_(new Bucket*[kHashTableSize]()) {
memset(table_, 0, kHashTableSize * sizeof(Bucket*));
}
StackTraceTable::~StackTraceTable() {
delete[] table_;
}
void StackTraceTable::AddTrace(const StackTrace& t) {
if (error_) {
return;
}
// Hash function borrowed from base/heap-profile-table.cc
uintptr_t h = 0;
for (int i = 0; i < t.depth; ++i) {
h += reinterpret_cast<uintptr_t>(t.stack[i]);
h += h << 10;
h ^= h >> 6;
}
h += h << 3;
h ^= h >> 11;
const int idx = h % kHashTableSize;
Bucket* b = table_[idx];
while (b != NULL && !b->KeyEqual(h, t)) {
b = b->next;
}
if (b != NULL) {
b->count++;
b->trace.size += t.size; // keep cumulative size
} else {
depth_total_ += t.depth;
bucket_total_++;
b = Static::bucket_allocator()->New();
if (b == NULL) {
Log(kLog, __FILE__, __LINE__,
"tcmalloc: could not allocate bucket", sizeof(*b));
error_ = true;
} else {
b->hash = h;
b->trace = t;
b->count = 1;
b->next = table_[idx];
table_[idx] = b;
}
}
}
void** StackTraceTable::ReadStackTracesAndClear() {
if (error_) {
return NULL;
}
// Allocate output array
const int out_len = bucket_total_ * 3 + depth_total_ + 1;
void** out = new void*[out_len];
if (out == NULL) {
Log(kLog, __FILE__, __LINE__,
"tcmalloc: allocation failed for stack traces",
out_len * sizeof(*out));
return NULL;
}
// Fill output array
int idx = 0;
for (int i = 0; i < kHashTableSize; ++i) {
Bucket* b = table_[i];
while (b != NULL) {
out[idx++] = reinterpret_cast<void*>(static_cast<uintptr_t>(b->count));
out[idx++] = reinterpret_cast<void*>(b->trace.size); // cumulative size
out[idx++] = reinterpret_cast<void*>(b->trace.depth);
for (int d = 0; d < b->trace.depth; ++d) {
out[idx++] = b->trace.stack[d];
}
b = b->next;
}
}
out[idx++] = NULL;
ASSERT(idx == out_len);
// Clear state
error_ = false;
depth_total_ = 0;
bucket_total_ = 0;
SpinLockHolder h(Static::pageheap_lock());
for (int i = 0; i < kHashTableSize; ++i) {
Bucket* b = table_[i];
while (b != NULL) {
Bucket* next = b->next;
Static::bucket_allocator()->Delete(b);
b = next;
}
table_[i] = NULL;
}
return out;
}
} // namespace tcmalloc
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