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70ebeabfb8
This patch does three main things: (1) It re-writes the cxa guard implementation to make it testable. (2) Adds support for recursive init detection on non-apple platforms. (3) It adds a futex based implementation. The futex based implementation locks and notifies on a per-object basis, unlike the current implementation which uses a global lock for all objects. Once this patch settles I'll turn it on by default when supported. llvm-svn: 359060
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
//===---------------------------- cxa_guard.cpp ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "__cxxabi_config.h"
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#include "cxxabi.h"
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// Tell the implementation that we're building the actual implementation
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// (and not testing it)
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#define BUILDING_CXA_GUARD
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#include "cxa_guard_impl.h"
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/*
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This implementation must be careful to not call code external to this file
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which will turn around and try to call __cxa_guard_acquire reentrantly.
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For this reason, the headers of this file are as restricted as possible.
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Previous implementations of this code for __APPLE__ have used
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std::__libcpp_mutex_lock and the abort_message utility without problem. This
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implementation also uses std::__libcpp_condvar_wait which has tested
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to not be a problem.
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*/
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namespace __cxxabiv1 {
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#if defined(_LIBCXXABI_GUARD_ABI_ARM)
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using guard_type = uint32_t;
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#else
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using guard_type = uint64_t;
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#endif
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extern "C"
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{
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_LIBCXXABI_FUNC_VIS int __cxa_guard_acquire(guard_type* raw_guard_object) {
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SelectedImplementation imp(raw_guard_object);
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return static_cast<int>(imp.cxa_guard_acquire());
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}
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_LIBCXXABI_FUNC_VIS void __cxa_guard_release(guard_type *raw_guard_object) {
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SelectedImplementation imp(raw_guard_object);
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imp.cxa_guard_release();
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}
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_LIBCXXABI_FUNC_VIS void __cxa_guard_abort(guard_type *raw_guard_object) {
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SelectedImplementation imp(raw_guard_object);
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imp.cxa_guard_abort();
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}
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} // extern "C"
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} // __cxxabiv1
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