1 //===- lib/Support/ErrorHandling.cpp - Callbacks for errors -----*- C++ -*-===//
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 for error handling, it supersedes cerr+abort(), and
11 // cerr+exit() style error handling.
12 // Callbacks can be registered for these errors through this API.
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>
22 
23 using namespace llvm;
24 using namespace std;
25 
26 static llvm_error_handler_t ErrorHandler = 0;
27 static void *ErrorHandlerUserData = 0;
28 
29 namespace llvm {
30 void llvm_install_error_handler(llvm_error_handler_t handler,
31                                 void *user_data) {
32   assert(!llvm_is_multithreaded() &&
33          "Cannot register error handlers after starting multithreaded mode!\n");
34   assert(!ErrorHandler && "Error handler already registered!\n");
35   ErrorHandler = handler;
36   ErrorHandlerUserData = user_data;
37 }
38 
39 void llvm_remove_error_handler() {
40   ErrorHandler = 0;
41 }
42 
43 void llvm_report_error(const char *reason) {
44   llvm_report_error(Twine(reason));
45 }
46 
47 void llvm_report_error(const std::string &reason) {
48   llvm_report_error(Twine(reason));
49 }
50 
51 void llvm_report_error(const Twine &reason) {
52   if (!ErrorHandler) {
53     errs() << "LLVM ERROR: " << reason << "\n";
54   } else {
55     ErrorHandler(ErrorHandlerUserData, reason.str());
56   }
57   exit(1);
58 }
59 
60 void llvm_unreachable_internal(const char *msg, const char *file,
61                                unsigned line) {
62   // This code intentionally doesn't call the ErrorHandler callback, because
63   // llvm_unreachable is intended to be used to indicate "impossible"
64   // situations, and not legitimate runtime errors.
65   if (msg)
66     dbgs() << msg << "\n";
67   dbgs() << "UNREACHABLE executed";
68   if (file)
69     dbgs() << " at " << file << ":" << line;
70   dbgs() << "!\n";
71   abort();
72 }
73 }
74 
75