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>
23 using namespace llvm;
24 using namespace std;
25 
26 static fatal_error_handler_t ErrorHandler = 0;
27 static void *ErrorHandlerUserData = 0;
28 
29 void 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 
38 void llvm::remove_fatal_error_handler() {
39   ErrorHandler = 0;
40 }
41 
42 void llvm::report_fatal_error(const char *reason) {
43   report_fatal_error(Twine(reason));
44 }
45 
46 void llvm::report_fatal_error(const std::string &reason) {
47   report_fatal_error(Twine(reason));
48 }
49 
50 void 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 
65 void 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