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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. 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.
*
* 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 HOLDER 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.
*/
#pragma once
#include "MmapRegion.h"
#include "SoftMMU.h"
#include <AK/Badge.h>
#include <AK/HashMap.h>
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <AK/Vector.h>
namespace UserspaceEmulator {
class Emulator;
class SoftCPU;
struct Mallocation {
bool contains(FlatPtr a) const
{
return a >= address && a < (address + size);
}
FlatPtr address { 0 };
size_t size { 0 };
bool used { false };
bool freed { false };
Vector<FlatPtr> malloc_backtrace;
Vector<FlatPtr> free_backtrace;
};
class MallocRegionMetadata {
public:
FlatPtr address { 0 };
size_t chunk_size { 0 };
size_t chunk_index_for_address(FlatPtr) const;
Mallocation& mallocation_for_address(FlatPtr) const;
Vector<Mallocation> mallocations;
};
class MallocTracer {
public:
explicit MallocTracer(Emulator&);
void target_did_malloc(Badge<SoftCPU>, FlatPtr address, size_t);
void target_did_free(Badge<SoftCPU>, FlatPtr address);
void target_did_realloc(Badge<SoftCPU>, FlatPtr address, size_t);
void audit_read(const Region&, FlatPtr address, size_t);
void audit_write(const Region&, FlatPtr address, size_t);
void dump_leak_report();
private:
template<typename Callback>
void for_each_mallocation(Callback callback) const;
Mallocation* find_mallocation(const Region&, FlatPtr);
Mallocation* find_mallocation(FlatPtr);
Mallocation* find_mallocation_before(FlatPtr);
Mallocation* find_mallocation_after(FlatPtr);
bool is_reachable(const Mallocation&) const;
Emulator& m_emulator;
bool m_auditing_enabled { true };
};
ALWAYS_INLINE Mallocation* MallocTracer::find_mallocation(const Region& region, FlatPtr address)
{
if (!is<MmapRegion>(region))
return nullptr;
if (!static_cast<const MmapRegion&>(region).is_malloc_block())
return nullptr;
auto* malloc_data = static_cast<MmapRegion&>(const_cast<Region&>(region)).malloc_metadata();
if (!malloc_data)
return nullptr;
auto& mallocation = malloc_data->mallocation_for_address(address);
if (!mallocation.used)
return nullptr;
VERIFY(mallocation.contains(address));
return &mallocation;
}
}
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