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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
116 lines
4.1 KiB
C++
116 lines
4.1 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/Debug.h>
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#include <AK/LogStream.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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#include <sys/internals.h>
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#include <sys/mman.h>
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extern "C" {
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struct AtExitEntry {
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AtExitFunction method { nullptr };
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void* parameter { nullptr };
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void* dso_handle { nullptr };
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bool has_been_called { false };
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};
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static constexpr size_t max_atexit_entry_count = PAGE_SIZE / sizeof(AtExitEntry);
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static AtExitEntry* atexit_entries;
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static size_t atexit_entry_count = 0;
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static void lock_atexit_handlers()
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{
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if (mprotect(atexit_entries, PAGE_SIZE, PROT_READ) < 0) {
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perror("lock_atexit_handlers");
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_exit(1);
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}
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}
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static void unlock_atexit_handlers()
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{
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if (mprotect(atexit_entries, PAGE_SIZE, PROT_READ | PROT_WRITE) < 0) {
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perror("unlock_atexit_handlers");
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_exit(1);
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}
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}
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int __cxa_atexit(AtExitFunction exit_function, void* parameter, void* dso_handle)
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{
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if (atexit_entry_count >= max_atexit_entry_count)
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return -1;
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if (!atexit_entries) {
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atexit_entries = (AtExitEntry*)mmap(nullptr, PAGE_SIZE, PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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if (atexit_entries == MAP_FAILED) {
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perror("__cxa_atexit mmap");
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_exit(1);
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}
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}
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unlock_atexit_handlers();
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atexit_entries[atexit_entry_count++] = { exit_function, parameter, dso_handle, false };
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lock_atexit_handlers();
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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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ssize_t entry_index = atexit_entry_count;
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dbgln_if(GLOBAL_DTORS_DEBUG, "__cxa_finalize: {} entries in the finalizer list", entry_index);
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while (--entry_index >= 0) {
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auto& exit_entry = atexit_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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dbgln_if(GLOBAL_DTORS_DEBUG, "__cxa_finalize: calling entry[{}] {:p}({:p}) dso: {:p}", entry_index, exit_entry.method, exit_entry.parameter, exit_entry.dso_handle);
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exit_entry.method(exit_entry.parameter);
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unlock_atexit_handlers();
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exit_entry.has_been_called = true;
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lock_atexit_handlers();
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}
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}
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}
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[[noreturn]] void __cxa_pure_virtual()
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{
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VERIFY_NOT_REACHED();
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}
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} // extern "C"
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