sanitizer_stackdepot.h
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//===-- sanitizer_stackdepot.h ----------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_STACKDEPOT_H
#define SANITIZER_STACKDEPOT_H
#include "sanitizer_common.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_stacktrace.h"
namespace __sanitizer {
// StackDepot efficiently stores huge amounts of stack traces.
struct StackDepotNode;
struct StackDepotHandle {
StackDepotNode *node_;
StackDepotHandle() : node_(nullptr) {}
explicit StackDepotHandle(StackDepotNode *node) : node_(node) {}
bool valid() { return node_; }
u32 id();
int use_count();
void inc_use_count_unsafe();
};
const int kStackDepotMaxUseCount = 1U << (SANITIZER_ANDROID ? 16 : 20);
StackDepotStats *StackDepotGetStats();
u32 StackDepotPut(StackTrace stack);
StackDepotHandle StackDepotPut_WithHandle(StackTrace stack);
// Retrieves a stored stack trace by the id.
StackTrace StackDepotGet(u32 id);
void StackDepotLockAll();
void StackDepotUnlockAll();
// Instantiating this class creates a snapshot of StackDepot which can be
// efficiently queried with StackDepotGet(). You can use it concurrently with
// StackDepot, but the snapshot is only guaranteed to contain those stack traces
// which were stored before it was instantiated.
class StackDepotReverseMap {
public:
StackDepotReverseMap();
StackTrace Get(u32 id);
private:
struct IdDescPair {
u32 id;
StackDepotNode *desc;
static bool IdComparator(const IdDescPair &a, const IdDescPair &b);
};
InternalMmapVector<IdDescPair> map_;
// Disallow evil constructors.
StackDepotReverseMap(const StackDepotReverseMap&);
void operator=(const StackDepotReverseMap&);
};
} // namespace __sanitizer
#endif // SANITIZER_STACKDEPOT_H