llvm-project/libc/include/__llvm-libc-common.h

//===-- Common definitions for LLVM-libc public header files --------------===//
//
// 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 LLVM_LIBC___COMMON_H
#define LLVM_LIBC___COMMON_H

#ifdef __cplusplus

#undef __BEGIN_C_DECLS
#define __BEGIN_C_DECLS extern "C" {

#undef __END_C_DECLS
#define __END_C_DECLS }

#undef _Noreturn
#define _Noreturn [[noreturn]]

#undef _Alignas
#define _Alignas alignas

#undef _Static_assert
#define _Static_assert static_assert

#undef _Alignof
#define _Alignof alignof

#undef _Thread_local
#define _Thread_local thread_local

#else // not __cplusplus

#undef __BEGIN_C_DECLS
#define __BEGIN_C_DECLS

#undef __END_C_DECLS
#define __END_C_DECLS

#undef __restrict
#define __restrict restrict // C99 and above support the restrict keyword.

#endif // __cplusplus

#endif // LLVM_LIBC___COMMON_H
[libc][NFC] Make all top of file comments consistent. Summary: Made all header files consistent based of this documentation: https://llvm.org/docs/CodingStandards.html#file-headers. And did the same for all source files top of file comments. Reviewers: sivachandra, abrachet Reviewed By: sivachandra, abrachet Subscribers: MaskRay, tschuett, libc-commits Tags: #libc-project Differential Revision: https://reviews.llvm.org/D77533 2020-04-09 01:16:30 +08:00			`//===-- Common definitions for LLVM-libc public header files --------------===//`
Add few docs and implementation of strcpy and strcat. Summary: This patch illustrates some of the features like modularity we want in the new libc. Few other ideas like different kinds of testing, redirectors etc are not yet present. Reviewers: dlj, hfinkel, theraven, jfb, alexshap, jdoerfert Subscribers: mgorny, dexonsmith, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67867 llvm-svn: 373764 2019-10-05 01:30:54 +08:00			`//`
			`// 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 LLVM_LIBC___COMMON_H`
			`#define LLVM_LIBC___COMMON_H`

			`#ifdef __cplusplus`

			`#undef __BEGIN_C_DECLS`
			`#define __BEGIN_C_DECLS extern "C" {`

			`#undef __END_C_DECLS`
			`#define __END_C_DECLS }`

[libc] Create abort and _Exit This revision creates abort and _Exit implementations Differential Revision: https://reviews.llvm.org/D74949 2020-03-06 03:21:18 +08:00			`#undef _Noreturn`
			`#define _Noreturn [[noreturn]]`

[libc] Add a class "Atomic" as a simple equivalent of std::atomic. Only the methods currently required by the libc have been added. Most of the existing uses of atomic operations have been switched over to this new class. A future change will clean up the rest of uses. This change now allows building mutex and condition variable code with a C++ compiler which does not have stdatomic.h, for example g++. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D120642 2022-02-28 06:15:21 +08:00			`#undef _Alignas`
			`#define _Alignas alignas`

[libc][NFC] Add a static assert for futex size. 2022-03-02 06:53:46 +08:00			`#undef _Static_assert`
			`#define _Static_assert static_assert`

[libc] Add a class "Atomic" as a simple equivalent of std::atomic. Only the methods currently required by the libc have been added. Most of the existing uses of atomic operations have been switched over to this new class. A future change will clean up the rest of uses. This change now allows building mutex and condition variable code with a C++ compiler which does not have stdatomic.h, for example g++. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D120642 2022-02-28 06:15:21 +08:00			`#undef _Alignof`
			`#define _Alignof alignof`

[libc] Make the errno macro resolve to the thread local variable directly. With modern architectures having a thread pointer and language supporting thread locals, there is no reason to use a function intermediary to access the thread local errno value. The entrypoint corresponding to errno has been replaced with an object library as there is no formal entrypoint for errno anymore. Reviewed By: jeffbailey, michaelrj Differential Revision: https://reviews.llvm.org/D120920 2022-03-03 18:25:35 +08:00			`#undef _Thread_local`
			`#define _Thread_local thread_local`

Add few docs and implementation of strcpy and strcat. Summary: This patch illustrates some of the features like modularity we want in the new libc. Few other ideas like different kinds of testing, redirectors etc are not yet present. Reviewers: dlj, hfinkel, theraven, jfb, alexshap, jdoerfert Subscribers: mgorny, dexonsmith, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D67867 llvm-svn: 373764 2019-10-05 01:30:54 +08:00			`#else // not __cplusplus`

			`#undef __BEGIN_C_DECLS`
			`#define __BEGIN_C_DECLS`

			`#undef __END_C_DECLS`
			`#define __END_C_DECLS`

			`#undef __restrict`
			`#define __restrict restrict // C99 and above support the restrict keyword.`

			`#endif // __cplusplus`

			`#endif // LLVM_LIBC___COMMON_H`