ErrorHandling.cpp revision 207618 
1//===- lib/Support/ErrorHandling.cpp - Callbacks for errors ---------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines an API used to indicate fatal error conditions.  Non-fatal
11// errors (most of them) should be handled through LLVMContext.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/ADT/Twine.h"
16#include "llvm/Support/Debug.h"
17#include "llvm/Support/ErrorHandling.h"
18#include "llvm/Support/raw_ostream.h"
19#include "llvm/System/Threading.h"
20#include <cassert>
21#include <cstdlib>
22using namespace llvm;
23using namespace std;
24
25static fatal_error_handler_t ErrorHandler = 0;
26static void *ErrorHandlerUserData = 0;
27
28void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
29                                       void *user_data) {
30  assert(!llvm_is_multithreaded() &&
31         "Cannot register error handlers after starting multithreaded mode!\n");
32  assert(!ErrorHandler && "Error handler already registered!\n");
33  ErrorHandler = handler;
34  ErrorHandlerUserData = user_data;
35}
36
37void llvm::remove_fatal_error_handler() {
38  ErrorHandler = 0;
39}
40
41void llvm::report_fatal_error(const char *reason) {
42  report_fatal_error(Twine(reason));
43}
44
45void llvm::report_fatal_error(const std::string &reason) {
46  report_fatal_error(Twine(reason));
47}
48
49void llvm::report_fatal_error(const Twine &reason) {
50  if (!ErrorHandler) {
51    errs() << "LLVM ERROR: " << reason << "\n";
52  } else {
53    ErrorHandler(ErrorHandlerUserData, reason.str());
54  }
55  exit(1);
56}
57
58void llvm::llvm_unreachable_internal(const char *msg, const char *file,
59                                     unsigned line) {
60  // This code intentionally doesn't call the ErrorHandler callback, because
61  // llvm_unreachable is intended to be used to indicate "impossible"
62  // situations, and not legitimate runtime errors.
63  if (msg)
64    dbgs() << msg << "\n";
65  dbgs() << "UNREACHABLE executed";
66  if (file)
67    dbgs() << " at " << file << ":" << line;
68  dbgs() << "!\n";
69  abort();
70}
71