ErrorHandling.cpp revision 208954 
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/Signals.h"
20#include "llvm/System/Threading.h"
21#include <cassert>
22#include <cstdlib>
23using namespace llvm;
24using namespace std;
25
26static fatal_error_handler_t ErrorHandler = 0;
27static void *ErrorHandlerUserData = 0;
28
29void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
30                                       void *user_data) {
31  assert(!llvm_is_multithreaded() &&
32         "Cannot register error handlers after starting multithreaded mode!\n");
33  assert(!ErrorHandler && "Error handler already registered!\n");
34  ErrorHandler = handler;
35  ErrorHandlerUserData = user_data;
36}
37
38void llvm::remove_fatal_error_handler() {
39  ErrorHandler = 0;
40}
41
42void llvm::report_fatal_error(const char *reason) {
43  report_fatal_error(Twine(reason));
44}
45
46void llvm::report_fatal_error(const std::string &reason) {
47  report_fatal_error(Twine(reason));
48}
49
50void llvm::report_fatal_error(const Twine &reason) {
51  if (!ErrorHandler) {
52    errs() << "LLVM ERROR: " << reason << "\n";
53  } else {
54    ErrorHandler(ErrorHandlerUserData, reason.str());
55  }
56
57  // If we reached here, we are failing ungracefully. Run the interrupt handlers
58  // to make sure any special cleanups get done, in particular that we remove
59  // files registered with RemoveFileOnSignal.
60  sys::RunInterruptHandlers();
61
62  exit(1);
63}
64
65void llvm::llvm_unreachable_internal(const char *msg, const char *file,
66                                     unsigned line) {
67  // This code intentionally doesn't call the ErrorHandler callback, because
68  // llvm_unreachable is intended to be used to indicate "impossible"
69  // situations, and not legitimate runtime errors.
70  if (msg)
71    dbgs() << msg << "\n";
72  dbgs() << "UNREACHABLE executed";
73  if (file)
74    dbgs() << " at " << file << ":" << line;
75  dbgs() << "!\n";
76  abort();
77}
78