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comparison lib/Support/ErrorHandling.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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-1:000000000000 0:95c75e76d11b
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/Support/ErrorHandling.h"
16 #include "llvm/ADT/SmallVector.h"
17 #include "llvm/ADT/Twine.h"
18 #include "llvm/Config/config.h"
19 #include "llvm/Support/Debug.h"
20 #include "llvm/Support/Signals.h"
21 #include "llvm/Support/Threading.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include "llvm-c/Core.h"
24 #include <cassert>
25 #include <cstdlib>
26
27 #if defined(HAVE_UNISTD_H)
28 # include <unistd.h>
29 #endif
30 #if defined(_MSC_VER)
31 # include <io.h>
32 # include <fcntl.h>
33 #endif
34
35 using namespace llvm;
36
37 static fatal_error_handler_t ErrorHandler = 0;
38 static void *ErrorHandlerUserData = 0;
39
40 void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
41 void *user_data) {
42 assert(!llvm_is_multithreaded() &&
43 "Cannot register error handlers after starting multithreaded mode!\n");
44 assert(!ErrorHandler && "Error handler already registered!\n");
45 ErrorHandler = handler;
46 ErrorHandlerUserData = user_data;
47 }
48
49 void llvm::remove_fatal_error_handler() {
50 ErrorHandler = 0;
51 }
52
53 void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
54 report_fatal_error(Twine(Reason), GenCrashDiag);
55 }
56
57 void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
58 report_fatal_error(Twine(Reason), GenCrashDiag);
59 }
60
61 void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
62 report_fatal_error(Twine(Reason), GenCrashDiag);
63 }
64
65 void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
66 if (ErrorHandler) {
67 ErrorHandler(ErrorHandlerUserData, Reason.str(), GenCrashDiag);
68 } else {
69 // Blast the result out to stderr. We don't try hard to make sure this
70 // succeeds (e.g. handling EINTR) and we can't use errs() here because
71 // raw ostreams can call report_fatal_error.
72 SmallVector<char, 64> Buffer;
73 raw_svector_ostream OS(Buffer);
74 OS << "LLVM ERROR: " << Reason << "\n";
75 StringRef MessageStr = OS.str();
76 ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
77 (void)written; // If something went wrong, we deliberately just give up.
78 }
79
80 // If we reached here, we are failing ungracefully. Run the interrupt handlers
81 // to make sure any special cleanups get done, in particular that we remove
82 // files registered with RemoveFileOnSignal.
83 sys::RunInterruptHandlers();
84
85 exit(1);
86 }
87
88 void llvm::llvm_unreachable_internal(const char *msg, const char *file,
89 unsigned line) {
90 // This code intentionally doesn't call the ErrorHandler callback, because
91 // llvm_unreachable is intended to be used to indicate "impossible"
92 // situations, and not legitimate runtime errors.
93 if (msg)
94 dbgs() << msg << "\n";
95 dbgs() << "UNREACHABLE executed";
96 if (file)
97 dbgs() << " at " << file << ":" << line;
98 dbgs() << "!\n";
99 abort();
100 #ifdef LLVM_BUILTIN_UNREACHABLE
101 // Windows systems and possibly others don't declare abort() to be noreturn,
102 // so use the unreachable builtin to avoid a Clang self-host warning.
103 LLVM_BUILTIN_UNREACHABLE;
104 #endif
105 }
106
107 static void bindingsErrorHandler(void *user_data, const std::string& reason,
108 bool gen_crash_diag) {
109 LLVMFatalErrorHandler handler =
110 LLVM_EXTENSION reinterpret_cast<LLVMFatalErrorHandler>(user_data);
111 handler(reason.c_str());
112 }
113
114 void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
115 install_fatal_error_handler(bindingsErrorHandler,
116 LLVM_EXTENSION reinterpret_cast<void *>(Handler));
117 }
118
119 void LLVMResetFatalErrorHandler() {
120 remove_fatal_error_handler();
121 }