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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"
#include "llvm/System/ThreadLocal.h"
#include "llvm/ADT/SmallString.h"
using namespace llvm;
namespace llvm {
bool DisablePrettyStackTrace = false;
}
// FIXME: This should be thread local when llvm supports threads.
static sys::ThreadLocal<const PrettyStackTraceEntry> PrettyStackTraceHead;
static unsigned PrintStack(const PrettyStackTraceEntry *Entry, raw_ostream &OS){
unsigned NextID = 0;
if (Entry->getNextEntry())
NextID = PrintStack(Entry->getNextEntry(), OS);
OS << NextID << ".\t";
Entry->print(OS);
return NextID+1;
}
/// PrintCurStackTrace - Print the current stack trace to the specified stream.
static void PrintCurStackTrace(raw_ostream &OS) {
// Don't print an empty trace.
if (PrettyStackTraceHead.get() == 0) return;
// If there are pretty stack frames registered, walk and emit them.
OS << "Stack dump:\n";
PrintStack(PrettyStackTraceHead.get(), OS);
OS.flush();
}
// Integrate with crash reporter.
#ifdef __APPLE__
extern "C" const char *__crashreporter_info__;
const char *__crashreporter_info__ = 0;
#endif
/// 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) {
#ifndef __APPLE__
// On non-apple systems, just emit the crash stack trace to stderr.
PrintCurStackTrace(errs());
#else
// Otherwise, emit to a smallvector of chars, send *that* to stderr, but also
// put it into __crashreporter_info__.
SmallString<2048> TmpStr;
{
raw_svector_ostream Stream(TmpStr);
PrintCurStackTrace(Stream);
}
if (!TmpStr.empty()) {
__crashreporter_info__ = strdup(std::string(TmpStr.str()).c_str());
errs() << TmpStr.str();
}
#endif
}
static bool RegisterCrashPrinter() {
if (!DisablePrettyStackTrace)
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.get();
PrettyStackTraceHead.set(this);
}
PrettyStackTraceEntry::~PrettyStackTraceEntry() {
assert(PrettyStackTraceHead.get() == this &&
"Pretty stack trace entry destruction is out of order");
PrettyStackTraceHead.set(getNextEntry());
}
void PrettyStackTraceString::print(raw_ostream &OS) const {
OS << Str << "\n";
}
void PrettyStackTraceProgram::print(raw_ostream &OS) const {
OS << "Program arguments: ";
// Print the argument list.
for (unsigned i = 0, e = ArgC; i != e; ++i)
OS << ArgV[i] << ' ';
OS << '\n';
}
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