mirror of
https://github.com/RGBCube/serenity
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112 lines
3.5 KiB
C++
112 lines
3.5 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "MmapRegion.h"
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#include "SoftMMU.h"
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#include <AK/Badge.h>
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#include <AK/HashMap.h>
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace UserspaceEmulator {
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class Emulator;
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class SoftCPU;
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struct Mallocation {
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bool contains(FlatPtr a) const
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{
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return a >= address && a < (address + size);
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}
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FlatPtr address { 0 };
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size_t size { 0 };
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bool used { false };
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bool freed { false };
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Vector<FlatPtr> malloc_backtrace;
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Vector<FlatPtr> free_backtrace;
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};
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class MallocRegionMetadata {
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public:
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FlatPtr address { 0 };
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size_t chunk_size { 0 };
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size_t chunk_index_for_address(FlatPtr) const;
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Mallocation& mallocation_for_address(FlatPtr) const;
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Vector<Mallocation> mallocations;
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};
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class MallocTracer {
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public:
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explicit MallocTracer(Emulator&);
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void target_did_malloc(Badge<SoftCPU>, FlatPtr address, size_t);
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void target_did_free(Badge<SoftCPU>, FlatPtr address);
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void target_did_realloc(Badge<SoftCPU>, FlatPtr address, size_t);
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void audit_read(const Region&, FlatPtr address, size_t);
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void audit_write(const Region&, FlatPtr address, size_t);
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void dump_leak_report();
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private:
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template<typename Callback>
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void for_each_mallocation(Callback callback) const;
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Mallocation* find_mallocation(const Region&, FlatPtr);
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Mallocation* find_mallocation(FlatPtr);
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Mallocation* find_mallocation_before(FlatPtr);
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Mallocation* find_mallocation_after(FlatPtr);
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bool is_reachable(const Mallocation&) const;
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Emulator& m_emulator;
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bool m_auditing_enabled { true };
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};
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ALWAYS_INLINE Mallocation* MallocTracer::find_mallocation(const Region& region, FlatPtr address)
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{
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if (!is<MmapRegion>(region))
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return nullptr;
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if (!static_cast<const MmapRegion&>(region).is_malloc_block())
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return nullptr;
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auto* malloc_data = static_cast<MmapRegion&>(const_cast<Region&>(region)).malloc_metadata();
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if (!malloc_data)
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return nullptr;
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auto& mallocation = malloc_data->mallocation_for_address(address);
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if (!mallocation.used)
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return nullptr;
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ASSERT(mallocation.contains(address));
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return &mallocation;
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}
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}
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