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//===- PrettyStackTrace.cpp - Pretty Crash Handling -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines some helpful functions for dealing with the possibility of
// Unix signals occuring while your program is running.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Signals.h"
using namespace llvm;
// FIXME: This should be thread local when llvm supports threads.
static const PrettyStackTraceEntry *PrettyStackTraceHead = 0;
/// CrashHandler - This callback is run if a fatal signal is delivered to the
/// process, it prints the pretty stack trace.
static void CrashHandler(void *Cookie) {
// If there are pretty stack frames registered, walk and emit them.
raw_ostream &OS = errs();
OS << "Stack dump:\n";
unsigned i = 0;
for (const PrettyStackTraceEntry *Entry = PrettyStackTraceHead; Entry;
Entry = Entry->getNextEntry(), ++i) {
OS << i << ".\t";
Entry->print(OS);
}
OS.flush();
}
static bool RegisterCrashPrinter() {
sys::AddSignalHandler(CrashHandler, 0);
return false;
}
PrettyStackTraceEntry::PrettyStackTraceEntry() {
// The first time this is called, we register the crash printer.
static bool HandlerRegistered = RegisterCrashPrinter();
HandlerRegistered = HandlerRegistered;
// Link ourselves.
NextEntry = PrettyStackTraceHead;
PrettyStackTraceHead = this;
}
PrettyStackTraceEntry::~PrettyStackTraceEntry() {
assert(PrettyStackTraceHead == this &&
"Pretty stack trace entry destruction is out of order");
PrettyStackTraceHead = getNextEntry();
}
void PrettyStackTraceString::print(raw_ostream &OS) const {
OS << Str << "\n";
}
void PrettyStackTraceProgram::print(raw_ostream &OS) const {
// Print the argument list.
for (unsigned i = 0, e = ArgC; i != e; ++i)
OS << ArgV[i] << ' ';
OS << '\n';
}
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