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Support: enable backtraces on Windows 

Some platforms, e.g. Windows, support backtraces but don't have
BACKTRACE. Checking for BACKTRACE prevents Windows from having
backtraces.

Patch by Jason Mittertreiner!

llvm-svn: 354951
This commit is contained in:
Saleem Abdulrasool 2019-02-27 03:21:50 +00:00
parent 7d3986ea30
commit b67342e7cb
1 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
llvm/lib/Support/PrettyStackTrace.cpp
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@ -33,7 +33,7 @@ using namespace llvm;
// If backtrace support is not enabled, compile out support for pretty stack // If backtrace support is not enabled, compile out support for pretty stack
// traces. This has the secondary effect of not requiring thread local storage // traces. This has the secondary effect of not requiring thread local storage
// when backtrace support is disabled. // when backtrace support is disabled.
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
// We need a thread local pointer to manage the stack of our stack trace // We need a thread local pointer to manage the stack of our stack trace
// objects, but we *really* cannot tolerate destructors running and do not want // objects, but we *really* cannot tolerate destructors running and do not want
@ -127,11 +127,10 @@ static void CrashHandler(void *) {
#endif #endif
} }
// defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #endif // ENABLE_BACKTRACES
#endif
PrettyStackTraceEntry::PrettyStackTraceEntry() { PrettyStackTraceEntry::PrettyStackTraceEntry() {
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
// Link ourselves. // Link ourselves.
NextEntry = PrettyStackTraceHead; NextEntry = PrettyStackTraceHead;
PrettyStackTraceHead = this; PrettyStackTraceHead = this;
@ -139,7 +138,7 @@ PrettyStackTraceEntry::PrettyStackTraceEntry() {
} }
PrettyStackTraceEntry::~PrettyStackTraceEntry() { PrettyStackTraceEntry::~PrettyStackTraceEntry() {
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
assert(PrettyStackTraceHead == this && assert(PrettyStackTraceHead == this &&
"Pretty stack trace entry destruction is out of order"); "Pretty stack trace entry destruction is out of order");
PrettyStackTraceHead = NextEntry; PrettyStackTraceHead = NextEntry;
@ -174,7 +173,7 @@ void PrettyStackTraceProgram::print(raw_ostream &OS) const {
OS << '\n'; OS << '\n';
} }
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
static bool RegisterCrashPrinter() { static bool RegisterCrashPrinter() {
sys::AddSignalHandler(CrashHandler, nullptr); sys::AddSignalHandler(CrashHandler, nullptr);
return false; return false;
@ -182,7 +181,7 @@ static bool RegisterCrashPrinter() {
#endif #endif
void llvm::EnablePrettyStackTrace() { void llvm::EnablePrettyStackTrace() {
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
// The first time this is called, we register the crash printer. // The first time this is called, we register the crash printer.
static bool HandlerRegistered = RegisterCrashPrinter(); static bool HandlerRegistered = RegisterCrashPrinter();
(void)HandlerRegistered; (void)HandlerRegistered;
@ -190,7 +189,7 @@ void llvm::EnablePrettyStackTrace() {
} }
const void *llvm::SavePrettyStackState() { const void *llvm::SavePrettyStackState() {
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
return PrettyStackTraceHead; return PrettyStackTraceHead;
#else #else
return nullptr; return nullptr;
@ -198,7 +197,7 @@ const void *llvm::SavePrettyStackState() {
} }
void llvm::RestorePrettyStackState(const void *Top) { void llvm::RestorePrettyStackState(const void *Top) {
#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES #if ENABLE_BACKTRACES
PrettyStackTraceHead = PrettyStackTraceHead =
static_cast<PrettyStackTraceEntry *>(const_cast<void *>(Top)); static_cast<PrettyStackTraceEntry *>(const_cast<void *>(Top));
#endif #endif