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86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
/*
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* Copyright (c) 2019-2020, Andrew Kaster <andrewdkaster@gmail.com>
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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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#include <AK/Types.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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//#define GLOBAL_DTORS_DEBUG
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extern "C" {
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typedef void (*AtExitFunction)(void*);
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struct __exit_entry {
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AtExitFunction method;
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void* parameter;
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void* dso_handle;
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bool has_been_called;
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};
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static __exit_entry __exit_entries[1024] {};
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static int __exit_entry_count = 0;
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int __cxa_atexit(AtExitFunction exit_function, void* parameter, void* dso_handle)
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{
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if (__exit_entry_count >= 1024)
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return -1;
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__exit_entries[__exit_entry_count++] = { exit_function, parameter, dso_handle, false };
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return 0;
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}
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void __cxa_finalize(void* dso_handle)
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{
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// From the itanium abi, https://itanium-cxx-abi.github.io/cxx-abi/abi.html#dso-dtor-runtime-api
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//
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// When __cxa_finalize(d) is called, it should walk the termination function list, calling each in turn
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// if d matches __dso_handle for the termination function entry. If d == NULL, it should call all of them.
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// Multiple calls to __cxa_finalize shall not result in calling termination function entries multiple times;
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// the implementation may either remove entries or mark them finished.
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int entry_index = __exit_entry_count;
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#ifdef GLOBAL_DTORS_DEBUG
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dbgprintf("__cxa_finalize: %d entries in the finalizer list\n", entry_index);
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#endif
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while (--entry_index >= 0) {
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auto& exit_entry = __exit_entries[entry_index];
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bool needs_calling = !exit_entry.has_been_called && (!dso_handle || dso_handle == exit_entry.dso_handle);
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if (needs_calling) {
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#ifdef GLOBAL_DTORS_DEBUG
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dbgprintf("__cxa_finalize: calling entry[%d] %p(%p) dso: %p\n", entry_index, exit_entry.method, exit_entry.parameter, exit_entry.dso_handle);
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#endif
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exit_entry.method(exit_entry.parameter);
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exit_entry.has_been_called = true;
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}
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}
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}
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} // extern "C"
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