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Merge branch 'fix-build-xenial' into avoid-std-terminate-in-write-buffers

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Alexey Milovidov 2019-12-24 20:14:05 +03:00
commit 20f0ec6265
5 changed files with 1 additions and 210 deletions
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2
contrib/libcxxabi vendored

@ -1 +1 @@
Subproject commit c26cf36f8387c5edf2cabb4a630f0975c35aa9fb
Subproject commit 7aacd45028ecf5f1c39985ecbd4f67eed9b11ce5

4
libs/libglibc-compatibility/CMakeLists.txt
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@ -27,10 +27,6 @@ if (GLIBC_COMPATIBILITY)
list(APPEND glibc_compatibility_sources musl/getentropy.c)
endif()
if(MAKE_STATIC_LIBRARIES)
list(APPEND glibc_compatibility_sources libcxxabi/cxa_thread_atexit.cpp)
endif()
# Need to omit frame pointers to match the performance of glibc
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fomit-frame-pointer")

76
libs/libglibc-compatibility/libcxxabi/LICENSE.TXT
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@ -1,76 +0,0 @@
==============================================================================
libc++abi License
==============================================================================
The libc++abi library is dual licensed under both the University of Illinois
"BSD-Like" license and the MIT license. As a user of this code you may choose
to use it under either license. As a contributor, you agree to allow your code
to be used under both.
Full text of the relevant licenses is included below.
==============================================================================
University of Illinois/NCSA
Open Source License
Copyright (c) 2009-2018 by the contributors listed in CREDITS.TXT
All rights reserved.
Developed by:
LLVM Team
University of Illinois at Urbana-Champaign
http://llvm.org
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal with
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimers.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimers in the
documentation and/or other materials provided with the distribution.
* Neither the names of the LLVM Team, University of Illinois at
Urbana-Champaign, nor the names of its contributors may be used to
endorse or promote products derived from this Software without specific
prior written permission.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
SOFTWARE.
==============================================================================
Copyright (c) 2009-2014 by the contributors listed in CREDITS.TXT
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

8
libs/libglibc-compatibility/libcxxabi/README.txt
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@ -1,8 +0,0 @@
Imported from https://github.com/llvm-project/llvm-project-20170507
revision: ad82e63b9719923cb393bd805730eaca0e3632a8
This is needed to avoid linking with "__cxa_thread_atexit_impl" function, that require too new (2.18) glibc library.
Note: "__cxa_thread_atexit_impl" may provide sophisticated implementation to correct destruction of thread-local objects,
that was created in different DSO. Read https://sourceware.org/glibc/wiki/Destructor%20support%20for%20thread_local%20variables
We simply don't need this implementation, because we don't use thread-local objects from different DSO.

121
libs/libglibc-compatibility/libcxxabi/cxa_thread_atexit.cpp
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@ -1,121 +0,0 @@
//===----------------------- cxa_thread_atexit.cpp ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <cstdlib>
#include <pthread.h>
using Dtor = void(*)(void*);
namespace {
// This implementation is used if the C library does not provide
// __cxa_thread_atexit_impl() for us. It has a number of limitations that are
// difficult to impossible to address without ..._impl():
//
// - dso_symbol is ignored. This means that a shared library may be unloaded
// (via dlclose()) before its thread_local destructors have run.
//
// - thread_local destructors for the main thread are run by the destructor of
// a static object. This is later than expected; they should run before the
// destructors of any objects with static storage duration.
//
// - thread_local destructors on non-main threads run on the first iteration
// through the __libccpp_tls_key destructors.
// std::notify_all_at_thread_exit() and similar functions must be careful to
// wait until the second iteration to provide their intended ordering
// guarantees.
//
// Another limitation, though one shared with ..._impl(), is that any
// thread_locals that are first initialized after non-thread_local global
// destructors begin to run will not be destroyed. [basic.start.term] states
// that all thread_local destructors are sequenced before the destruction of
// objects with static storage duration, resulting in a contradiction if a
// thread_local is constructed after that point. Thus we consider such
// programs ill-formed, and don't bother to run those destructors. (If the
// program terminates abnormally after such a thread_local is constructed,
// the destructor is not expected to run and thus there is no contradiction.
// So construction still has to work.)
struct DtorList {
Dtor dtor;
void* obj;
DtorList* next;
};
// The linked list of thread-local destructors to run
__thread DtorList* dtors = nullptr;
// True if the destructors are currently scheduled to run on this thread
__thread bool dtors_alive = false;
// Used to trigger destructors on thread exit; value is ignored
pthread_key_t dtors_key;
void run_dtors(void*) {
while (auto head = dtors) {
dtors = head->next;
head->dtor(head->obj);
std::free(head);
}
dtors_alive = false;
}
struct DtorsManager {
DtorsManager() {
// There is intentionally no matching std::__libcpp_tls_delete call, as
// __cxa_thread_atexit() may be called arbitrarily late (for example, from
// global destructors or atexit() handlers).
if (pthread_key_create(&dtors_key, run_dtors) != 0) {
abort();
}
}
~DtorsManager() {
// std::__libcpp_tls_key destructors do not run on threads that call exit()
// (including when the main thread returns from main()), so we explicitly
// call the destructor here. This runs at exit time (potentially earlier
// if libc++abi is dlclose()'d). Any thread_locals initialized after this
// point will not be destroyed.
run_dtors(nullptr);
}
};
} // namespace
extern "C"
{
int __cxa_thread_atexit_impl(Dtor dtor, void* obj, void* dso_symbol) throw()
{
// Initialize the dtors std::__libcpp_tls_key (uses __cxa_guard_*() for
// one-time initialization and __cxa_atexit() for destruction)
static DtorsManager manager;
if (!dtors_alive) {
if (pthread_setspecific(dtors_key, &dtors_key) != 0) {
return -1;
}
dtors_alive = true;
}
auto head = static_cast<DtorList*>(std::malloc(sizeof(DtorList)));
if (!head) {
return -1;
}
head->dtor = dtor;
head->obj = obj;
head->next = dtors;
dtors = head;
return 0;
}
int __attribute__((__weak__)) __cxa_thread_atexit(Dtor dtor, void* obj, void* dso_symbol) throw()
{
return __cxa_thread_atexit_impl(dtor, obj, dso_symbol);
}
} // extern "C"