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Add LLVM libcxxabi (#1063)
* third_party: Add libcxxabi Added libcxxabi from LLVM 17.0.6 The library implements the Itanium C++ exception handling ABI. * third_party/libcxxabi: Enable __cxa_thread_atexit Enable `__cxa_thread_atexit` from libcxxabi. `__cxa_thread_atexit_impl` is still implemented by the cosmo libc. The original `__cxa_thread_atexit` has been removed. * third_party/libcxx: Build with exceptions Build libcxx with exceptions enabled. - Removed `_LIBCPP_NO_EXCEPTIONS` from `__config`. - Switched the exception implementation to `libcxxabi`. These two files are taken from the same `libcxx` version as mentioned in `README.cosmo`. - Removed `new_handler_fallback` in favor of `libcxxabi` implementation. - Enable `-fexceptions` and `-frtti` for `libcxx`. - Removed `THIRD_PARTY_LIBCXX` dependency from `libcxxabi` and `libunwind`. These libraries do not use any runtime `libcxx` functions, just headers. * libc: Remove remaining redundant cxa functions - `__cxa_pure_virtual` in `libcxxabi` is also a stub similar to the existing one. - `__cxa_guard_*` from `libcxxabi` is used instead of the ones from Android. Now there should be no more duplicate implementations. `__cxa_thread_atexit_impl`, `__cxa_atexit`, and related supporting functions, are still left to other libraries as in `libcxxabi`. `libcxxabi` is also now added to `cosmopolitan.a` to make up for the removed functions. Affected in-tree libraries (`third_party/double-conversion`) have been updated.
This commit is contained in:
Trung Nguyen
GitHub
parent
94bab1618d
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8b33204f37
53 changed files with 14606 additions and 372 deletions
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/kprintf.h"
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#include "libc/runtime/runtime.h"
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void __cxa_pure_virtual(void) {
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#ifndef NDEBUG
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kprintf("__cxa_pure_virtual() called\n"
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"Did you call a virtual method from a destructor?\n");
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#endif
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abort();
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}
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/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "libc/atomic.h"
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#include "libc/cxxabi.h"
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#include "libc/intrin/atomic.h"
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#include "libc/limits.h"
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#include "third_party/nsync/futex.internal.h"
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// This file contains C++ ABI support functions for one time
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// constructors as defined in the "Run-time ABI for the ARM Architecture"
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// section 4.4.2
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//
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// ARM C++ ABI and Itanium/x86 C++ ABI has different definition for
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// one time construction:
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//
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// ARM C++ ABI defines the LSB of guard variable should be tested
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// by compiler-generated code before calling __cxa_guard_acquire et al.
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//
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// The Itanium/x86 C++ ABI defines the low-order _byte_ should be
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// tested instead.
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//
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// Meanwhile, guard variable are 32bit aligned for ARM, and 64bit
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// aligned for x86.
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//
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// Reference documentation:
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//
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// section 3.2.3 of ARM IHI 0041C (for ARM)
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// section 3.3.2 of the Itanium C++ ABI specification v1.83 (for x86).
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//
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// There is no C++ ABI available for other ARCH. But the gcc source
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// shows all other ARCH follow the definition of Itanium/x86 C++ ABI.
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// The Itanium/x86 C++ ABI (used by all architectures that aren't ARM32)
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// mandates guard variables are 64-bit aligned, 64-bit values. The least
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// significant byte is tested by the compiler-generated code before it's
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// calling __cxa_guard_acquire.
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union CxaGuardValue {
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atomic_int state;
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int64_t aligner;
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};
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// Set construction state values according to reference documentation. 0
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// is the initialization value. Arm requires ((*gv & 1) == 1) after
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// __cxa_guard_release, ((*gv & 3) == 0) after __cxa_guard_abort. X86
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// requires first byte not modified by __cxa_guard_acquire, first byte
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// is non-zero after __cxa_guard_release.
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#define CONSTRUCTION_NOT_YET_STARTED 0
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#define CONSTRUCTION_COMPLETE 1
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#define CONSTRUCTION_UNDERWAY_WITHOUT_WAITER 0x100
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#define CONSTRUCTION_UNDERWAY_WITH_WAITER 0x200
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int __cxa_guard_acquire(union CxaGuardValue *gv) {
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int old_value = atomic_load_explicit(&gv->state, memory_order_relaxed);
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while (true) {
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if (old_value == CONSTRUCTION_COMPLETE) {
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// A load_acquire operation is needed before exiting with COMPLETE
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// state, as we must ensure that all the stores performed by the
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// construction function are observable on this CPU after we exit.
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atomic_thread_fence(memory_order_acquire);
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return 0;
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} else if (old_value == CONSTRUCTION_NOT_YET_STARTED) {
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if (!atomic_compare_exchange_weak_explicit(
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&gv->state, &old_value, CONSTRUCTION_UNDERWAY_WITHOUT_WAITER,
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memory_order_relaxed, memory_order_relaxed)) {
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continue;
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}
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// The acquire fence may not be needed. But as described in section 3.3.2
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// of the Itanium C++ ABI specification, it probably has to behave like
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// the acquisition of a mutex, which needs an acquire fence.
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atomic_thread_fence(memory_order_acquire);
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return 1;
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} else if (old_value == CONSTRUCTION_UNDERWAY_WITHOUT_WAITER) {
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if (!atomic_compare_exchange_weak_explicit(
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&gv->state, &old_value, CONSTRUCTION_UNDERWAY_WITH_WAITER,
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memory_order_relaxed, memory_order_relaxed)) {
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continue;
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}
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}
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nsync_futex_wait_(&gv->state, CONSTRUCTION_UNDERWAY_WITH_WAITER, 0, 0);
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old_value = atomic_load_explicit(&gv->state, memory_order_relaxed);
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}
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}
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void __cxa_guard_release(union CxaGuardValue *gv) {
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// Release fence is used to make all stores performed by the construction
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// function visible in other threads.
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int old_value = atomic_exchange_explicit(&gv->state, CONSTRUCTION_COMPLETE,
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memory_order_release);
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if (old_value == CONSTRUCTION_UNDERWAY_WITH_WAITER) {
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nsync_futex_wake_(&gv->state, INT_MAX, 0);
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}
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}
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void __cxa_guard_abort(union CxaGuardValue *gv) {
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// Release fence is used to make all stores performed by the construction
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// function visible in other threads.
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int old_value = atomic_exchange_explicit(
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&gv->state, CONSTRUCTION_NOT_YET_STARTED, memory_order_release);
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if (old_value == CONSTRUCTION_UNDERWAY_WITH_WAITER) {
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nsync_futex_wake_(&gv->state, INT_MAX, 0);
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}
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}
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@ -1,23 +0,0 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/cxaatexit.internal.h"
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int __cxa_thread_atexit(void *fun, void *arg, void *dso_symbol) {
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return __cxa_thread_atexit_impl(fun, arg, dso_symbol);
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}
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