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annotate lib/Support/ErrorHandling.cpp @ 20:a5b470e0d09d

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set FastCC(Calling Convention) when the function is code segment and set GuaranteedTailCallOpt. but llvm still output not jmp but call...
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sun, 06 Oct 2013 18:16:15 +0900
parents 9ad51c7bc036
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1 //===- lib/Support/ErrorHandling.cpp - Callbacks for errors ---------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file defines an API used to indicate fatal error conditions. Non-fatal
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11 // errors (most of them) should be handled through LLVMContext.
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12 //
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13 //===----------------------------------------------------------------------===//
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14
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15 #include "llvm/Support/ErrorHandling.h"
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16 #include "llvm/ADT/SmallVector.h"
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17 #include "llvm/ADT/Twine.h"
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18 #include "llvm/Config/config.h"
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19 #include "llvm/Support/Debug.h"
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20 #include "llvm/Support/Signals.h"
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21 #include "llvm/Support/Threading.h"
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22 #include "llvm/Support/raw_ostream.h"
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23 #include <cassert>
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24 #include <cstdlib>
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25
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26 #if defined(HAVE_UNISTD_H)
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27 # include <unistd.h>
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28 #endif
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29 #if defined(_MSC_VER)
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30 # include <io.h>
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31 # include <fcntl.h>
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32 #endif
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33
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34 using namespace llvm;
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35
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36 static fatal_error_handler_t ErrorHandler = 0;
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37 static void *ErrorHandlerUserData = 0;
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38
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39 void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
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40 void *user_data) {
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41 assert(!llvm_is_multithreaded() &&
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42 "Cannot register error handlers after starting multithreaded mode!\n");
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43 assert(!ErrorHandler && "Error handler already registered!\n");
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44 ErrorHandler = handler;
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45 ErrorHandlerUserData = user_data;
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46 }
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47
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48 void llvm::remove_fatal_error_handler() {
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49 ErrorHandler = 0;
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50 }
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51
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52 void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
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53 report_fatal_error(Twine(Reason), GenCrashDiag);
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54 }
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55
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56 void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
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57 report_fatal_error(Twine(Reason), GenCrashDiag);
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58 }
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59
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60 void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
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61 report_fatal_error(Twine(Reason), GenCrashDiag);
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62 }
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63
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64 void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
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65 if (ErrorHandler) {
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66 ErrorHandler(ErrorHandlerUserData, Reason.str(), GenCrashDiag);
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67 } else {
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68 // Blast the result out to stderr. We don't try hard to make sure this
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69 // succeeds (e.g. handling EINTR) and we can't use errs() here because
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70 // raw ostreams can call report_fatal_error.
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71 SmallVector<char, 64> Buffer;
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72 raw_svector_ostream OS(Buffer);
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73 OS << "LLVM ERROR: " << Reason << "\n";
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74 StringRef MessageStr = OS.str();
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75 ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
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76 (void)written; // If something went wrong, we deliberately just give up.
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77 }
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78
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79 // If we reached here, we are failing ungracefully. Run the interrupt handlers
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80 // to make sure any special cleanups get done, in particular that we remove
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81 // files registered with RemoveFileOnSignal.
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82 sys::RunInterruptHandlers();
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83
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84 exit(1);
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85 }
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86
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87 void llvm::llvm_unreachable_internal(const char *msg, const char *file,
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88 unsigned line) {
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89 // This code intentionally doesn't call the ErrorHandler callback, because
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90 // llvm_unreachable is intended to be used to indicate "impossible"
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91 // situations, and not legitimate runtime errors.
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92 if (msg)
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93 dbgs() << msg << "\n";
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94 dbgs() << "UNREACHABLE executed";
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95 if (file)
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96 dbgs() << " at " << file << ":" << line;
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97 dbgs() << "!\n";
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98 abort();
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99 }