libc/src/setjmp/setjmp_impl.h

   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
  18 namespace 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 int setjmp(jmp_buf buf);
  33
  34 } // namespace LIBC_NAMESPACE_DECL
  35
  36 #endif // LLVM_LIBC_SRC_SETJMP_SETJMP_IMPL_H