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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /build/unix/stdc++compat | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | build/unix/stdc++compat/hide_std.ld | 5 | ||||
-rw-r--r-- | build/unix/stdc++compat/moz.build | 24 | ||||
-rw-r--r-- | build/unix/stdc++compat/stdc++compat.cpp | 196 |
3 files changed, 225 insertions, 0 deletions
diff --git a/build/unix/stdc++compat/hide_std.ld b/build/unix/stdc++compat/hide_std.ld new file mode 100644 index 0000000000..4b3400b0f3 --- /dev/null +++ b/build/unix/stdc++compat/hide_std.ld @@ -0,0 +1,5 @@ +hidden { + local: + # std::thread::_M_start_thread(...) + _ZNSt6thread15_M_start_thread*; +}; diff --git a/build/unix/stdc++compat/moz.build b/build/unix/stdc++compat/moz.build new file mode 100644 index 0000000000..a3681d15d8 --- /dev/null +++ b/build/unix/stdc++compat/moz.build @@ -0,0 +1,24 @@ +# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*- +# vim: set filetype=python: +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +if CONFIG["OS_TARGET"] == "Linux": + Library("stdc++compat") + SOURCES += ["stdc++compat.cpp"] + +if CONFIG["HOST_OS_ARCH"] == "Linux": + HostLibrary("host_stdc++compat") + HOST_SOURCES += [ + "stdc++compat.cpp", + ] + +FORCE_STATIC_LIB = True + +NO_PGO = True + +DisableStlWrapping() +COMPILE_FLAGS["CLANG_PLUGIN"] = [] + +OS_LIBS += ["-Wl,--version-script,%s/hide_std.ld" % SRCDIR] diff --git a/build/unix/stdc++compat/stdc++compat.cpp b/build/unix/stdc++compat/stdc++compat.cpp new file mode 100644 index 0000000000..0180f6bcfa --- /dev/null +++ b/build/unix/stdc++compat/stdc++compat.cpp @@ -0,0 +1,196 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include <ostream> +#include <istream> +#include <sstream> +#include <memory> +#include <string> +#include <stdarg.h> +#include <stdio.h> +#include <mozilla/Assertions.h> +#include <cxxabi.h> + +/* + GLIBCXX_3.4.19 is from gcc 4.8.1 (199309) + GLIBCXX_3.4.20 is from gcc 4.9.0 (199307) + GLIBCXX_3.4.21 is from gcc 5.0 (210290) + GLIBCXX_3.4.22 is from gcc 6.0 (222482) + GLIBCXX_3.4.23 is from gcc 7 + GLIBCXX_3.4.24 is from gcc 8 + GLIBCXX_3.4.25 is from gcc 8 + GLIBCXX_3.4.26 is from gcc 9 + GLIBCXX_3.4.27 is from gcc 10 + GLIBCXX_3.4.28 is from gcc 10 + GLIBCXX_3.4.29 is from gcc 11 + +This file adds the necessary compatibility tricks to avoid symbols with +version GLIBCXX_3.4.20 and bigger, keeping binary compatibility with +libstdc++ 4.8.1. + +WARNING: all symbols from this file must be defined weak when they +overlap with libstdc++. +*/ + +namespace std { + +/* We shouldn't be throwing exceptions at all, but it sadly turns out + we call STL (inline) functions that do. This avoids the GLIBCXX_3.4.20 + symbol version. */ +void __attribute__((weak)) __throw_out_of_range_fmt(char const* fmt, ...) { + va_list ap; + char buf[1024]; // That should be big enough. + + va_start(ap, fmt); + vsnprintf(buf, sizeof(buf), fmt, ap); + buf[sizeof(buf) - 1] = 0; + va_end(ap); + + __throw_range_error(buf); +} + +} // namespace std + +namespace __cxxabiv1 { +/* Calls to this function are added by the compiler itself on `new Class[n]` + * calls. This avoids the GLIBCXX_3.4.20 symbol version. */ +extern "C" void __attribute__((weak)) __cxa_throw_bad_array_new_length() { + MOZ_CRASH(); +} +} // namespace __cxxabiv1 + +#if _GLIBCXX_RELEASE >= 11 +namespace std { + +/* This avoids the GLIBCXX_3.4.29 symbol version. */ +void __attribute__((weak)) __throw_bad_array_new_length() { MOZ_CRASH(); } + +} // namespace std +#endif + +/* While we generally don't build with exceptions, we have some host tools + * that do use them. libstdc++ from GCC 5.0 added exception constructors with + * char const* argument. Older versions only have a constructor with + * std::string. This avoids the GLIBCXX_3.4.21 symbol version. */ +namespace std { +__attribute__((weak)) runtime_error::runtime_error(char const* s) + : runtime_error(std::string(s)) {} +__attribute__((weak)) out_of_range::out_of_range(char const* s) + : out_of_range(std::string(s)) {} +__attribute__((weak)) invalid_argument::invalid_argument(char const* s) + : invalid_argument(std::string(s)) {} +} // namespace std + +/* Expose the definitions for the old ABI, allowing us to call its functions */ +#define _GLIBCXX_THREAD_ABI_COMPAT 1 +#include <thread> + +namespace std { +/* The old ABI has a thread::_M_start_thread(shared_ptr<_Impl_base>), + * while the new has thread::_M_start_thread(unique_ptr<_State>, void(*)()). + * There is an intermediate ABI at version 3.4.21, with + * thread::_M_start_thread(shared_ptr<_Impl_base>, void(*)()). + * The void(*)() parameter is only there to keep a reference to pthread_create + * on the caller side, and is unused in the implementation + * We're creating an entry point for the new and intermediate ABIs, and make + * them call the old ABI. This avoids the GLIBCXX_3.4.21 symbol version. */ +__attribute__((weak)) void thread::_M_start_thread(shared_ptr<_Impl_base> impl, + void (*)()) { + _M_start_thread(std::move(impl)); +} + +/* We need a _Impl_base-derived class wrapping a _State to call the old ABI + * from what we got by diverting the new API. This avoids the GLIBCXX_3.4.22 + * symbol version. */ +struct StateWrapper : public thread::_Impl_base { + unique_ptr<thread::_State> mState; + + StateWrapper(unique_ptr<thread::_State> aState) : mState(std::move(aState)) {} + + void _M_run() override { mState->_M_run(); } +}; + +/* This avoids the GLIBCXX_3.4.22 symbol version. */ +__attribute__((weak)) void thread::_M_start_thread(unique_ptr<_State> aState, + void (*)()) { + auto impl = std::make_shared<StateWrapper>(std::move(aState)); + _M_start_thread(std::move(impl)); +} + +/* For some reason this is a symbol exported by new versions of libstdc++, + * even though the destructor is default there too. This avoids the + * GLIBCXX_3.4.22 symbol version. */ +__attribute__((weak)) thread::_State::~_State() = default; + +#if _GLIBCXX_RELEASE >= 9 +// Ideally we'd define +// bool _Sp_make_shared_tag::_S_eq(const type_info& ti) noexcept +// but we wouldn't be able to change its visibility because of the existing +// definition in C++ headers. We do need to change its visibility because we +// don't want it to be shadowing the one provided by libstdc++ itself, because +// it doesn't support RTTI. Not supporting RTTI doesn't matter for Firefox +// itself because it's built with RTTI disabled. +// So we define via the mangled symbol. +// This avoids the GLIBCXX_3.4.26 symbol version. +extern "C" __attribute__((visibility("hidden"))) bool +_ZNSt19_Sp_make_shared_tag5_S_eqERKSt9type_info(const type_info*) noexcept { + return false; +} +#endif + +} // namespace std + +namespace std { +/* Instantiate this template to avoid GLIBCXX_3.4.21 symbol versions + * depending on optimization level */ +template basic_ios<char, char_traits<char>>::operator bool() const; +} // namespace std + +#if !defined(MOZ_ASAN) && !defined(MOZ_TSAN) +/* operator delete with size is only available in CXXAPI_1.3.9, equivalent to + * GLIBCXX_3.4.21. */ +void operator delete(void* ptr, size_t size) noexcept(true) { + ::operator delete(ptr); +} +#endif + +namespace std { +/* Instantiate this template to avoid GLIBCXX_3.4.23 symbol versions + * depending on optimization level */ +template basic_string<char, char_traits<char>, allocator<char>>::basic_string( + const basic_string&, size_t, const allocator<char>&); + +#if _GLIBCXX_RELEASE >= 9 +// This avoids the GLIBCXX_3.4.26 symbol version. +template basic_stringstream<char, char_traits<char>, + allocator<char>>::basic_stringstream(); + +template basic_ostringstream<char, char_traits<char>, + allocator<char>>::basic_ostringstream(); +#endif + +#if _GLIBCXX_RELEASE >= 11 +// This avoids the GLIBCXX_3.4.29 symbol version. +template void basic_string<char, char_traits<char>, allocator<char>>::reserve(); + +template void +basic_string<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>::reserve(); +#endif + +} // namespace std + +/* The __cxa_thread_atexit_impl symbol is only available on GLIBC 2.18, but we + * want things to keep working on 2.17. It's not actually used directly from + * C++ code, but through __cxa_thead_atexit in libstdc++. The problem we have, + * though, is that rust's libstd also uses it, introducing a dependency we + * don't actually want. Fortunately, we can fall back to libstdc++'s wrapper + * (which, on systems without __cxa_thread_atexit_impl, has its own compatible + * implementation). + * The __cxa_thread_atexit symbol itself is marked CXXABI_1.3.7, which is + * equivalent to GLIBCXX_3.4.18. + */ +extern "C" int __cxa_thread_atexit_impl(void (*dtor)(void*), void* obj, + void* dso_handle) { + return __cxxabiv1::__cxa_thread_atexit(dtor, obj, dso_handle); +} |