From: Owen Anderson <resistor@mac.com>
Date: Thu, 25 Jun 2009 23:31:33 +0000 (+0000)
Subject: Support thread-local pretty stack traces.
X-Git-Tag: android-x86-6.0-r1~1003^2~19541
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=0b49c32c56443a41f76c415bddc226488217da2f;p=android-x86%2Fexternal-llvm.git

Support thread-local pretty stack traces.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74227 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/PrettyStackTrace.cpp b/lib/Support/PrettyStackTrace.cpp
index c111c5e6be2..14290a1284f 100644
--- a/lib/Support/PrettyStackTrace.cpp
+++ b/lib/Support/PrettyStackTrace.cpp
@@ -15,11 +15,12 @@
 #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;
 
 // FIXME: This should be thread local when llvm supports threads.
-static const PrettyStackTraceEntry *PrettyStackTraceHead = 0;
+static sys::ThreadLocal<const PrettyStackTraceEntry> PrettyStackTraceHead;
 
 static unsigned PrintStack(const PrettyStackTraceEntry *Entry, raw_ostream &OS){
   unsigned NextID = 0;
@@ -34,12 +35,12 @@ static unsigned PrintStack(const PrettyStackTraceEntry *Entry, raw_ostream &OS){
 /// PrintCurStackTrace - Print the current stack trace to the specified stream.
 static void PrintCurStackTrace(raw_ostream &OS) {
   // Don't print an empty trace.
-  if (PrettyStackTraceHead == 0) return;
+  if (PrettyStackTraceHead.get() == 0) return;
   
   // If there are pretty stack frames registered, walk and emit them.
   OS << "Stack dump:\n";
   
-  PrintStack(PrettyStackTraceHead, OS);
+  PrintStack(PrettyStackTraceHead.get(), OS);
   OS.flush();
 }
 
@@ -84,14 +85,14 @@ PrettyStackTraceEntry::PrettyStackTraceEntry() {
   HandlerRegistered = HandlerRegistered;
     
   // Link ourselves.
-  NextEntry = PrettyStackTraceHead;
-  PrettyStackTraceHead = this;
+  NextEntry = PrettyStackTraceHead.get();
+  PrettyStackTraceHead.set(this);
 }
 
 PrettyStackTraceEntry::~PrettyStackTraceEntry() {
-  assert(PrettyStackTraceHead == this &&
+  assert(PrettyStackTraceHead.get() == this &&
          "Pretty stack trace entry destruction is out of order");
-  PrettyStackTraceHead = getNextEntry();
+  PrettyStackTraceHead.set(getNextEntry());
 }
 
 void PrettyStackTraceString::print(raw_ostream &OS) const {