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6eeb281e09
it's only really useful if you're going to crash anyways. Use it in the pretty stack trace printer to kill the compiler if we hang while printing the stack trace. llvm-svn: 177962
138 lines
4.1 KiB
C++
138 lines
4.1 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 occurring 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/ADT/SmallString.h"
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#include "llvm/Config/config.h" // Get autoconf configuration settings
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/ThreadLocal.h"
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#include "llvm/Support/Watchdog.h"
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#include "llvm/Support/raw_ostream.h"
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#ifdef HAVE_CRASHREPORTERCLIENT_H
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#include <CrashReporterClient.h>
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#endif
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using namespace llvm;
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namespace llvm {
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bool DisablePrettyStackTrace = false;
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}
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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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{
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sys::Watchdog W(5);
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Entry->print(OS);
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}
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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 libraries.
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#if defined (__APPLE__) && HAVE_CRASHREPORTERCLIENT_H
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// If any clients of llvm try to link to libCrashReporterClient.a themselves,
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// only one crash info struct will be used.
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extern "C" {
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CRASH_REPORTER_CLIENT_HIDDEN
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struct crashreporter_annotations_t gCRAnnotations
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__attribute__((section("__DATA," CRASHREPORTER_ANNOTATIONS_SECTION)))
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= { CRASHREPORTER_ANNOTATIONS_VERSION, 0, 0, 0, 0, 0, 0 };
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}
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#elif defined (__APPLE__) && HAVE_CRASHREPORTER_INFO
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static const char *__crashreporter_info__ = 0;
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asm(".desc ___crashreporter_info__, 0x10");
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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 *) {
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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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#ifdef HAVE_CRASHREPORTERCLIENT_H
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// Cast to void to avoid warning.
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(void)CRSetCrashLogMessage(std::string(TmpStr.str()).c_str());
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#elif HAVE_CRASHREPORTER_INFO
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__crashreporter_info__ = strdup(std::string(TmpStr.str()).c_str());
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#endif
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errs() << TmpStr.str();
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}
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#endif
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}
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static bool RegisterCrashPrinter() {
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if (!DisablePrettyStackTrace)
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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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(void)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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