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https://github.com/LadybirdBrowser/ladybird.git
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94ca55cefd
As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020, 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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#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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