llvm/compiler-rt/lib/builtins/int_util.c

//===-- int_util.c - Implement internal utilities -------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "int_lib.h"

// NOTE: The definitions in this file are declared weak because we clients to be
// able to arbitrarily package individual functions into separate .a files. If
// we did not declare these weak, some link situations might end up seeing
// duplicate strong definitions of the same symbol.
//
// We can't use this solution for kernel use (which may not support weak), but
// currently expect that when built for kernel use all the functionality is
// packaged into a single library.

#ifdef KERNEL_USE

NORETURN extern void panic(const char *, ...);
#ifndef _WIN32
__attribute__((visibility("hidden")))
#endif
void __compilerrt_abort_impl(const char *file, int line, const char *function) {
  panic("%s:%d: abort in %s", file, line, function);
}

#elif __APPLE__

// from libSystem.dylib
NORETURN extern void __assert_rtn(const char *func, const char *file, int line,
                                  const char *message);

__attribute__((weak))
__attribute__((visibility("hidden")))
void __compilerrt_abort_impl(const char *file, int line, const char *function) {
  __assert_rtn(function, file, line, "libcompiler_rt abort");
}

#else

#ifdef _WIN32
#include <stdlib.h>
#endif

#ifndef _WIN32
__attribute__((weak))
__attribute__((visibility("hidden")))
#endif
void __compilerrt_abort_impl(const char *file, int line, const char *function) { … }

#endif