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diff --git a/tools/llvm-mc/AsmCond.h b/tools/llvm-mc/AsmCond.h
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+//===- AsmCond.h - Assembly file conditional assembly  ----------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ASMCOND_H
+#define ASMCOND_H
+
+namespace llvm {
+
+/// AsmCond - Class to support conditional assembly
+///
+/// The conditional assembly feature (.if, .else, .elseif and .endif) is
+/// implemented with AsmCond that tells us what we are in the middle of 
+/// processing.  Ignore can be either true or false.  When true we are ignoring
+/// the block of code in the middle of a conditional.
+
+class AsmCond {
+public:
+  enum ConditionalAssemblyType {
+    NoCond,     // no conditional is being processed
+    IfCond,     // inside if conditional
+    ElseIfCond, // inside elseif conditional
+    ElseCond    // inside else conditional
+  };
+
+  ConditionalAssemblyType TheCond;
+  bool CondMet;
+  bool Ignore;
+
+  AsmCond() : TheCond(NoCond), CondMet(false), Ignore(false) {}
+};
+
+} // end namespace llvm
+
+#endif