BumpPtrAllocator: do the size check without moving any pointers

[oota-llvm.git] / include / llvm / Support / ThreadLocal.h

diff --git a/include/llvm/Support/ThreadLocal.h b/include/llvm/Support/ThreadLocal.h
index 15350a7afff7e6544b526b5217c4edb53a779876..7518626901e0b279dcae9ba9f781364684084d4a 100644 (file)
--- a/include/llvm/Support/ThreadLocal.h
+++ b/include/llvm/Support/ThreadLocal.h
@@ -11,9 +11,10 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_SYSTEM_THREAD_LOCAL_H
-#define LLVM_SYSTEM_THREAD_LOCAL_H
+#ifndef LLVM_SUPPORT_THREADLOCAL_H
+#define LLVM_SUPPORT_THREADLOCAL_H
 
+#include "llvm/Support/DataTypes.h"
 #include "llvm/Support/Threading.h"
 #include <cassert>
 
@@ -22,7 +23,15 @@ namespace llvm {
     // ThreadLocalImpl - Common base class of all ThreadLocal instantiations.
     // YOU SHOULD NEVER USE THIS DIRECTLY.
     class ThreadLocalImpl {
-      void* data;
+      typedef uint64_t ThreadLocalDataTy;
+      /// \brief Platform-specific thread local data.
+      ///
+      /// This is embedded in the class and we avoid malloc'ing/free'ing it,
+      /// to make this class more safe for use along with CrashRecoveryContext.
+      union {
+        char data[sizeof(ThreadLocalDataTy)];
+        ThreadLocalDataTy align_data;
+      };
     public:
       ThreadLocalImpl();
       virtual ~ThreadLocalImpl();