1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
//===- lib/Support/ErrorHandling.cpp - Callbacks for errors ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an API used to indicate fatal error conditions. Non-fatal
// errors (most of them) should be handled through LLVMContext.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ErrorHandling.h"
#include "llvm-c/Core.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Config/config.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/MutexGuard.h"
#include "llvm/Support/Threading.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdlib>
#if defined(HAVE_UNISTD_H)
# include <unistd.h>
#endif
#if defined(_MSC_VER)
# include <io.h>
# include <fcntl.h>
#endif
using namespace llvm;
static fatal_error_handler_t ErrorHandler = nullptr;
static void *ErrorHandlerUserData = nullptr;
static sys::Mutex ErrorHandlerMutex;
void llvm::install_fatal_error_handler(fatal_error_handler_t handler,
void *user_data) {
llvm::MutexGuard Lock(ErrorHandlerMutex);
assert(!ErrorHandler && "Error handler already registered!\n");
ErrorHandler = handler;
ErrorHandlerUserData = user_data;
}
void llvm::remove_fatal_error_handler() {
llvm::MutexGuard Lock(ErrorHandlerMutex);
ErrorHandler = nullptr;
ErrorHandlerUserData = nullptr;
}
void llvm::report_fatal_error(const char *Reason, bool GenCrashDiag) {
report_fatal_error(Twine(Reason), GenCrashDiag);
}
void llvm::report_fatal_error(const std::string &Reason, bool GenCrashDiag) {
report_fatal_error(Twine(Reason), GenCrashDiag);
}
void llvm::report_fatal_error(StringRef Reason, bool GenCrashDiag) {
report_fatal_error(Twine(Reason), GenCrashDiag);
}
void llvm::report_fatal_error(const Twine &Reason, bool GenCrashDiag) {
llvm::fatal_error_handler_t handler = nullptr;
void* handlerData = nullptr;
{
// Only acquire the mutex while reading the handler, so as not to invoke a
// user-supplied callback under a lock.
llvm::MutexGuard Lock(ErrorHandlerMutex);
handler = ErrorHandler;
handlerData = ErrorHandlerUserData;
}
if (handler) {
handler(handlerData, Reason.str(), GenCrashDiag);
} else {
// Blast the result out to stderr. We don't try hard to make sure this
// succeeds (e.g. handling EINTR) and we can't use errs() here because
// raw ostreams can call report_fatal_error.
SmallVector<char, 64> Buffer;
raw_svector_ostream OS(Buffer);
OS << "LLVM ERROR: " << Reason << "\n";
StringRef MessageStr = OS.str();
ssize_t written = ::write(2, MessageStr.data(), MessageStr.size());
(void)written; // If something went wrong, we deliberately just give up.
}
// If we reached here, we are failing ungracefully. Run the interrupt handlers
// to make sure any special cleanups get done, in particular that we remove
// files registered with RemoveFileOnSignal.
sys::RunInterruptHandlers();
exit(1);
}
void llvm::llvm_unreachable_internal(const char *msg, const char *file,
unsigned line) {
// This code intentionally doesn't call the ErrorHandler callback, because
// llvm_unreachable is intended to be used to indicate "impossible"
// situations, and not legitimate runtime errors.
if (msg)
dbgs() << msg << "\n";
dbgs() << "UNREACHABLE executed";
if (file)
dbgs() << " at " << file << ":" << line;
dbgs() << "!\n";
abort();
#ifdef LLVM_BUILTIN_UNREACHABLE
// Windows systems and possibly others don't declare abort() to be noreturn,
// so use the unreachable builtin to avoid a Clang self-host warning.
LLVM_BUILTIN_UNREACHABLE;
#endif
}
static void bindingsErrorHandler(void *user_data, const std::string& reason,
bool gen_crash_diag) {
LLVMFatalErrorHandler handler =
LLVM_EXTENSION reinterpret_cast<LLVMFatalErrorHandler>(user_data);
handler(reason.c_str());
}
void LLVMInstallFatalErrorHandler(LLVMFatalErrorHandler Handler) {
install_fatal_error_handler(bindingsErrorHandler,
LLVM_EXTENSION reinterpret_cast<void *>(Handler));
}
void LLVMResetFatalErrorHandler() {
remove_fatal_error_handler();
}
|
