From 8ee284673f9581a8e43159e296dbbb3e4832c81a Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 27 Dec 2008 07:47:40 +0000
Subject: [PATCH] implement simplify_type for PATypeHolder so that
 isa<FooType>(PATypeHolder) works.

llvm-svn: 61448
---
 llvm/include/llvm/AbstractTypeUser.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/llvm/include/llvm/AbstractTypeUser.h b/llvm/include/llvm/AbstractTypeUser.h
index f7fabfcb2fe4..80656d89b726 100644
--- a/llvm/include/llvm/AbstractTypeUser.h
+++ b/llvm/include/llvm/AbstractTypeUser.h
@@ -33,6 +33,7 @@ namespace llvm {
 
 class Type;
 class DerivedType;
+template<typename T> struct simplify_type;
 
 /// The AbstractTypeUser class is an interface to be implemented by classes who
 /// could possibly use an abstract type.  Abstract types are denoted by the
@@ -174,6 +175,21 @@ private:
   void dropRef();
 };
 
+// simplify_type - Allow clients to treat uses just like values when using
+// casting operators.
+template<> struct simplify_type<PATypeHolder> {
+  typedef const Type* SimpleType;
+  static SimpleType getSimplifiedValue(const PATypeHolder &Val) {
+    return static_cast<SimpleType>(Val.get());
+  }
+};
+template<> struct simplify_type<const PATypeHolder> {
+  typedef const Type* SimpleType;
+  static SimpleType getSimplifiedValue(const PATypeHolder &Val) {
+    return static_cast<SimpleType>(Val.get());
+  }
+};
+  
 } // End llvm namespace
 
 #endif