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https://github.com/RGBCube/serenity
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c4dd77a170
When a mallocation is shrunk/grown without moving, UE needs to update its precise metadata about the mallocation, since it tracks *exactly* how many bytes were allocated, not just the malloc chunk size.
74 lines
2.4 KiB
C++
74 lines
2.4 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 <AK/Badge.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 SoftCPU;
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class MallocTracer {
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public:
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MallocTracer();
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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(FlatPtr address, size_t);
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void audit_write(FlatPtr address, size_t);
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void dump_leak_report();
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private:
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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 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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Mallocation* find_mallocation(FlatPtr);
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Mallocation* find_mallocation_before(FlatPtr);
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bool is_reachable(const Mallocation&) const;
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Vector<Mallocation> m_mallocations;
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bool m_auditing_enabled { true };
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};
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}
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