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110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
//===- PrettyStackTrace.cpp - Pretty Crash Handling -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines some helpful functions for dealing with the possibility of
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// Unix signals occuring while your program is running.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/System/Signals.h"
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#include "llvm/System/ThreadLocal.h"
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#include "llvm/ADT/SmallString.h"
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using namespace llvm;
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// FIXME: This should be thread local when llvm supports threads.
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static sys::ThreadLocal<const PrettyStackTraceEntry> PrettyStackTraceHead;
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static unsigned PrintStack(const PrettyStackTraceEntry *Entry, raw_ostream &OS){
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unsigned NextID = 0;
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if (Entry->getNextEntry())
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NextID = PrintStack(Entry->getNextEntry(), OS);
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OS << NextID << ".\t";
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Entry->print(OS);
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return NextID+1;
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}
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/// PrintCurStackTrace - Print the current stack trace to the specified stream.
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static void PrintCurStackTrace(raw_ostream &OS) {
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// Don't print an empty trace.
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if (PrettyStackTraceHead.get() == 0) return;
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// If there are pretty stack frames registered, walk and emit them.
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OS << "Stack dump:\n";
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PrintStack(PrettyStackTraceHead.get(), OS);
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OS.flush();
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}
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// Integrate with crash reporter.
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#ifdef __APPLE__
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extern "C" const char *__crashreporter_info__;
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const char *__crashreporter_info__ = 0;
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#endif
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/// CrashHandler - This callback is run if a fatal signal is delivered to the
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/// process, it prints the pretty stack trace.
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static void CrashHandler(void *Cookie) {
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#ifndef __APPLE__
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// On non-apple systems, just emit the crash stack trace to stderr.
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PrintCurStackTrace(errs());
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#else
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// Otherwise, emit to a smallvector of chars, send *that* to stderr, but also
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// put it into __crashreporter_info__.
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SmallString<2048> TmpStr;
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{
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raw_svector_ostream Stream(TmpStr);
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PrintCurStackTrace(Stream);
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}
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if (!TmpStr.empty()) {
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__crashreporter_info__ = strdup(TmpStr.c_str());
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errs() << __crashreporter_info__;
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}
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#endif
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}
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static bool RegisterCrashPrinter() {
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sys::AddSignalHandler(CrashHandler, 0);
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return false;
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}
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PrettyStackTraceEntry::PrettyStackTraceEntry() {
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// The first time this is called, we register the crash printer.
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static bool HandlerRegistered = RegisterCrashPrinter();
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HandlerRegistered = HandlerRegistered;
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// Link ourselves.
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NextEntry = PrettyStackTraceHead.get();
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PrettyStackTraceHead.set(this);
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}
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PrettyStackTraceEntry::~PrettyStackTraceEntry() {
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assert(PrettyStackTraceHead.get() == this &&
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"Pretty stack trace entry destruction is out of order");
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PrettyStackTraceHead.set(getNextEntry());
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}
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void PrettyStackTraceString::print(raw_ostream &OS) const {
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OS << Str << "\n";
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}
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void PrettyStackTraceProgram::print(raw_ostream &OS) const {
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OS << "Program arguments: ";
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// Print the argument list.
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for (unsigned i = 0, e = ArgC; i != e; ++i)
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OS << ArgV[i] << ' ';
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OS << '\n';
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}
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