//===--- InterceptTraps.cpp -----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

#include <stdio.h>
#include <signal.h>
#include <string.h>
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__)) || defined(__wasi__)
#include <unistd.h>
#endif
#if defined(_WIN32)
#include <io.h>
#include <process.h>
#include <stdlib.h>
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#endif

#include "swift/Runtime/Config.h"

static void CrashCatcher(int Sig) {
  const char *Msg;
  switch (Sig) {
    case SIGILL:  Msg = "CRASHED: SIGILL\n";  break;
    case SIGABRT: Msg = "CRASHED: SIGABRT\n"; break;
    case SIGFPE:  Msg = "CRASHED: SIGFPE\n";  break;
    case SIGSEGV: Msg = "CRASHED: SIGSEGV\n"; break;
#if !defined(_WIN32)
    case SIGTRAP: Msg = "CRASHED: SIGTRAP\n"; break;
    case SIGBUS:  Msg = "CRASHED: SIGBUS\n";  break;
    case SIGSYS:  Msg = "CRASHED: SIGSYS\n";  break;
#endif
    default:      Msg = "CRASHED: SIG????\n"; break;
  }
#if defined(_WIN32)
  _write(_fileno(stderr), Msg, strlen(Msg));
#else
  write(STDERR_FILENO, Msg, strlen(Msg));
#endif
  _exit(0);
}

#if defined(_WIN32)
static LONG WINAPI
VectoredCrashHandler(PEXCEPTION_POINTERS ExceptionInfo) {
  switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
  case EXCEPTION_ILLEGAL_INSTRUCTION:
    _write(_fileno(stderr), "CRASHED: SIGTRAP\n", 17);
    _exit(0);

  case EXCEPTION_DATATYPE_MISALIGNMENT:
    _write(_fileno(stderr), "CRASHED: SIGBUS\n", 16);
    _exit(0);
  }

  return EXCEPTION_CONTINUE_SEARCH;
}
#endif // _WIN32

SWIFT_CC(swift) SWIFT_RUNTIME_LIBRARY_VISIBILITY extern "C"
void installTrapInterceptor() {
  // Disable buffering on stdout so that everything is printed before crashing.
  setbuf(stdout, 0);

#if defined(_WIN32)
  _set_abort_behavior(0, _WRITE_ABORT_MSG);
#endif

  signal(SIGILL,  CrashCatcher);
  signal(SIGABRT, CrashCatcher);
  signal(SIGFPE,  CrashCatcher);
  signal(SIGSEGV, CrashCatcher);
#if defined(_WIN32)
  AddVectoredExceptionHandler(TRUE, VectoredCrashHandler);
#else
  signal(SIGTRAP, CrashCatcher);
  signal(SIGBUS,  CrashCatcher);
  signal(SIGSYS,  CrashCatcher);
#endif
}