libcxx: update to LLVM 18

release/18.x branch, commit 78b99c73ee4b96fe9ce0e294d4632326afb2db42

This adds the flag `-D_LIBCPP_HARDENING_MODE` which is determined based
on the Zig optimization mode.

This commit also fixes libunwind, libcxx, and libcxxabi to properly
report sub compilation errors.

1 files changed, 135 insertions, 0 deletions

diff --git a/lib/libcxx/include/__thread/jthread.h b/lib/libcxx/include/__thread/jthread.h
new file mode 100644
index 0000000000..2fbc8a3675
--- /dev/null
+++ b/lib/libcxx/include/__thread/jthread.h
@@ -0,0 +1,135 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___THREAD_JTHREAD_H
+#define _LIBCPP___THREAD_JTHREAD_H
+
+#include <__availability>
+#include <__config>
+#include <__functional/invoke.h>
+#include <__stop_token/stop_source.h>
+#include <__stop_token/stop_token.h>
+#include <__thread/thread.h>
+#include <__threading_support>
+#include <__type_traits/decay.h>
+#include <__type_traits/is_constructible.h>
+#include <__type_traits/is_same.h>
+#include <__type_traits/remove_cvref.h>
+#include <__utility/forward.h>
+#include <__utility/move.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN)
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+class _LIBCPP_AVAILABILITY_SYNC jthread {
+public:
+  // types
+  using id                 = thread::id;
+  using native_handle_type = thread::native_handle_type;
+
+  // [thread.jthread.cons], constructors, move, and assignment
+  _LIBCPP_HIDE_FROM_ABI jthread() noexcept : __stop_source_(std::nostopstate) {}
+
+  template <class _Fun, class... _Args>
+  _LIBCPP_HIDE_FROM_ABI explicit jthread(_Fun&& __fun, _Args&&... __args)
+    requires(!std::is_same_v<remove_cvref_t<_Fun>, jthread>)
+      : __stop_source_(),
+        __thread_(__init_thread(__stop_source_, std::forward<_Fun>(__fun), std::forward<_Args>(__args)...)) {
+    static_assert(is_constructible_v<decay_t<_Fun>, _Fun>);
+    static_assert((is_constructible_v<decay_t<_Args>, _Args> && ...));
+    static_assert(is_invocable_v<decay_t<_Fun>, decay_t<_Args>...> ||
+                  is_invocable_v<decay_t<_Fun>, stop_token, decay_t<_Args>...>);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI ~jthread() {
+    if (joinable()) {
+      request_stop();
+      join();
+    }
+  }
+
+  jthread(const jthread&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI jthread(jthread&&) noexcept = default;
+
+  jthread& operator=(const jthread&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI jthread& operator=(jthread&& __other) noexcept {
+    if (this != &__other) {
+      if (joinable()) {
+        request_stop();
+        join();
+      }
+      __stop_source_ = std::move(__other.__stop_source_);
+      __thread_      = std::move(__other.__thread_);
+    }
+
+    return *this;
+  }
+
+  // [thread.jthread.mem], members
+  _LIBCPP_HIDE_FROM_ABI void swap(jthread& __other) noexcept {
+    std::swap(__stop_source_, __other.__stop_source_);
+    std::swap(__thread_, __other.__thread_);
+  }
+
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI bool joinable() const noexcept { return get_id() != id(); }
+
+  _LIBCPP_HIDE_FROM_ABI void join() { __thread_.join(); }
+
+  _LIBCPP_HIDE_FROM_ABI void detach() { __thread_.detach(); }
+
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI id get_id() const noexcept { return __thread_.get_id(); }
+
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() { return __thread_.native_handle(); }
+
+  // [thread.jthread.stop], stop token handling
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI stop_source get_stop_source() noexcept { return __stop_source_; }
+
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI stop_token get_stop_token() const noexcept { return __stop_source_.get_token(); }
+
+  _LIBCPP_HIDE_FROM_ABI bool request_stop() noexcept { return __stop_source_.request_stop(); }
+
+  // [thread.jthread.special], specialized algorithms
+  _LIBCPP_HIDE_FROM_ABI friend void swap(jthread& __lhs, jthread& __rhs) noexcept { __lhs.swap(__rhs); }
+
+  // [thread.jthread.static], static members
+  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static unsigned int hardware_concurrency() noexcept {
+    return thread::hardware_concurrency();
+  }
+
+private:
+  template <class _Fun, class... _Args>
+  _LIBCPP_HIDE_FROM_ABI static thread __init_thread(const stop_source& __ss, _Fun&& __fun, _Args&&... __args) {
+    if constexpr (is_invocable_v<decay_t<_Fun>, stop_token, decay_t<_Args>...>) {
+      return thread(std::forward<_Fun>(__fun), __ss.get_token(), std::forward<_Args>(__args)...);
+    } else {
+      return thread(std::forward<_Fun>(__fun), std::forward<_Args>(__args)...);
+    }
+  }
+
+  stop_source __stop_source_;
+  thread __thread_;
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_STOP_TOKEN)
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___THREAD_JTHREAD_H