lib/Support/ErrorHandling.cpp

   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/ErrorHandling.h"
  17 #include "llvm/Support/raw_ostream.h"
  18 #include "llvm/System/Threading.h"
  19 #include <cassert>
  20 #include <cstdlib>
  21
  22 using namespace llvm;
  23 using namespace std;
  24
  25 static llvm_error_handler_t ErrorHandler = 0;
  26 static void *ErrorHandlerUserData = 0;
  27
  28 namespace llvm {
  29 void llvm_install_error_handler(llvm_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_error_handler() {
  39   ErrorHandler = 0;
  40 }
  41
  42 void llvm_report_error(const char *reason) {
  43   llvm_report_error(Twine(reason));
  44 }
  45
  46 void llvm_report_error(const std::string &reason) {
  47   llvm_report_error(Twine(reason));
  48 }
  49
  50 void llvm_report_error(const Twine &reason) {
  51   if (!ErrorHandler) {
  52     errs() << "LLVM ERROR: " << reason << "\n";
  53   } else {
  54     ErrorHandler(ErrorHandlerUserData, reason.str());
  55   }
  56   exit(1);
  57 }
  58
  59 void llvm_unreachable_internal(const char *msg, const char *file,
  60                                unsigned line) {
  61   // This code intentionally doesn't call the ErrorHandler callback, because
  62   // llvm_unreachable is intended to be used to indicate "impossible"
  63   // situations, and not legitimate runtime errors.
  64   if (msg)
  65     errs() << msg << "\n";
  66   errs() << "UNREACHABLE executed";
  67   if (file)
  68     errs() << " at " << file << ":" << line;
  69   errs() << "!\n";
  70   abort();
  71 }
  72 }
  73