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1//===-- Implementation header for setjmp ------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef LLVM_LIBC_SRC_SETJMP_SETJMP_IMPL_H
10#define LLVM_LIBC_SRC_SETJMP_SETJMP_IMPL_H
11
12// This header has the _impl prefix in its name to avoid conflict with the
13// public header setjmp.h which is also included. here.
14#include "hdr/types/jmp_buf.h"
15#include "src/__support/macros/config.h"
16#include "src/__support/macros/properties/compiler.h"
17
18namespace LIBC_NAMESPACE_DECL {
19
20// TODO(https://github.com/llvm/llvm-project/issues/112427)
21// Some of the architecture-specific definitions are marked `naked`, which in
22// GCC implies `nothrow`.
23//
24// Right now, our aliases aren't marked `nothrow`, so we wind up in a situation
25// where clang will emit -Wmissing-exception-spec if we add `nothrow` here, but
26// GCC will emit -Wmissing-attributes here without `nothrow`. We need to update
27// LLVM_LIBC_FUNCTION to denote when a function throws or not.
28
29#ifdef LIBC_COMPILER_IS_GCC
30[[gnu::nothrow]]
31#endif
32[[gnu::returns_twice]] int
33setjmp(jmp_buf buf);
34
35} // namespace LIBC_NAMESPACE_DECL
36
37#endif // LLVM_LIBC_SRC_SETJMP_SETJMP_IMPL_H
38

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source code of libc/src/setjmp/setjmp_impl.h