From b67342e7cb08e9b3b64f07698ffab616ef397edb Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Wed, 27 Feb 2019 03:21:50 +0000
Subject: 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
---
 llvm/lib/Support/PrettyStackTrace.cpp | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

(limited to 'llvm/lib/Support/PrettyStackTrace.cpp')

diff --git a/llvm/lib/Support/PrettyStackTrace.cpp b/llvm/lib/Support/PrettyStackTrace.cpp
index 6e0b35b5e53..8863dea67dd 100644
--- a/llvm/lib/Support/PrettyStackTrace.cpp
+++ b/llvm/lib/Support/PrettyStackTrace.cpp
@@ -33,7 +33,7 @@ using namespace llvm;
 // If backtrace support is not enabled, compile out support for pretty stack
 // traces.  This has the secondary effect of not requiring thread local storage
 // 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
 // objects, but we *really* cannot tolerate destructors running and do not want
@@ -127,11 +127,10 @@ static void CrashHandler(void *) {
 #endif
 }
 
-// defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
-#endif
+#endif // ENABLE_BACKTRACES
 
 PrettyStackTraceEntry::PrettyStackTraceEntry() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   // Link ourselves.
   NextEntry = PrettyStackTraceHead;
   PrettyStackTraceHead = this;
@@ -139,7 +138,7 @@ PrettyStackTraceEntry::PrettyStackTraceEntry() {
 }
 
 PrettyStackTraceEntry::~PrettyStackTraceEntry() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   assert(PrettyStackTraceHead == this &&
          "Pretty stack trace entry destruction is out of order");
   PrettyStackTraceHead = NextEntry;
@@ -174,7 +173,7 @@ void PrettyStackTraceProgram::print(raw_ostream &OS) const {
   OS << '\n';
 }
 
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
 static bool RegisterCrashPrinter() {
   sys::AddSignalHandler(CrashHandler, nullptr);
   return false;
@@ -182,7 +181,7 @@ static bool RegisterCrashPrinter() {
 #endif
 
 void llvm::EnablePrettyStackTrace() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   // The first time this is called, we register the crash printer.
   static bool HandlerRegistered = RegisterCrashPrinter();
   (void)HandlerRegistered;
@@ -190,7 +189,7 @@ void llvm::EnablePrettyStackTrace() {
 }
 
 const void *llvm::SavePrettyStackState() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   return PrettyStackTraceHead;
 #else
   return nullptr;
@@ -198,7 +197,7 @@ const void *llvm::SavePrettyStackState() {
 }
 
 void llvm::RestorePrettyStackState(const void *Top) {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   PrettyStackTraceHead =
       static_cast<PrettyStackTraceEntry *>(const_cast<void *>(Top));
 #endif
-- 
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