X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FAbstractTypeUser.h;h=81f5c5c7680d87ef4b6f8b0fe76cc3963923287d;hb=35fcd6557f53aab69c2990b80fed4653fbaa3473;hp=ee3fde033eb0345ec261eea48f380b3db8156529;hpb=cb403d69fb620d4df66233d27a6f8c545ce0d0e4;p=oota-llvm.git

diff --git a/include/llvm/AbstractTypeUser.h b/include/llvm/AbstractTypeUser.h
index ee3fde033eb..81f5c5c7680 100644
--- a/include/llvm/AbstractTypeUser.h
+++ b/include/llvm/AbstractTypeUser.h
@@ -2,8 +2,8 @@
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -14,9 +14,11 @@
 #ifndef LLVM_ABSTRACT_TYPE_USER_H
 #define LLVM_ABSTRACT_TYPE_USER_H
 
-// IMPORTANT: Do not include this file directly.  Include Type.h instead.
-// Some versions of GCC can't handle the inlined method PATypeHolder::dropRef()
-// correctly otherwise.
+#if !defined(LLVM_TYPE_H) && !defined(LLVM_VALUE_H)
+#error Do not include this file directly.  Include Type.h instead.
+#error Some versions of GCC (e.g. 3.4 and 4.1) can not handle the inlined method
+#error PATypeHolder::dropRef() correctly otherwise.
+#endif
 
 // This is the "master" include for <cassert> Whether this file needs it or not,
 // it must always include <cassert> for the files which include
@@ -29,8 +31,10 @@
 
 namespace llvm {
 
+class Value;
 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
@@ -39,7 +43,7 @@ class DerivedType;
 ///
 /// Classes must implement this interface so that they may be notified when an
 /// abstract type is resolved.  Abstract types may be resolved into more 
-/// concrete types through: linking, parsing, and bytecode reading.  When this 
+/// concrete types through: linking, parsing, and bitcode reading.  When this 
 /// happens, all of the users of the type must be updated to reference the new,
 /// more concrete type.  They are notified through the AbstractTypeUser 
 /// interface.
@@ -52,6 +56,12 @@ class DerivedType;
 class AbstractTypeUser {
 protected:
   virtual ~AbstractTypeUser();                        // Derive from me
+
+  /// setType - It's normally not possible to change a Value's type in place,
+  /// but an AbstractTypeUser subclass that knows what its doing can be
+  /// permitted to do so with care.
+  void setType(Value *V, const Type *NewTy);
+
 public:
 
   /// refineAbstractType - The callback method invoked when an abstract type is
@@ -62,7 +72,7 @@ public:
                                   const Type *NewTy) = 0;
 
   /// The other case which AbstractTypeUsers must be aware of is when a type
-  /// makes the transition from being abstract (where it has clients on it's
+  /// makes the transition from being abstract (where it has clients on its
   /// AbstractTypeUsers list) to concrete (where it does not).  This method
   /// notifies ATU's when this occurs for a type.
   ///
@@ -134,7 +144,9 @@ public:
 ///
 class PATypeHolder {
   mutable const Type *Ty;
+  void destroy();
 public:
+  PATypeHolder() : Ty(0) {}
   PATypeHolder(const Type *ty) : Ty(ty) {
     addRef();
   }
@@ -170,8 +182,24 @@ public:
 private:
   void addRef();
   void dropRef();
+  friend class TypeMapBase;
 };
 
+// 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