X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FAbstractTypeUser.h;h=c1216baabf8fac950ba59fcd29efd55897f0b6aa;hb=617dd7baa6dfd3a7b5ee72ace37f6b6aeaa6006b;hp=a06252dc73d13cbc74b38e884da351f644095884;hpb=ec90d8f80d0ad5614c14db74dd22f5e3f100f2cb;p=oota-llvm.git diff --git a/include/llvm/AbstractTypeUser.h b/include/llvm/AbstractTypeUser.h index a06252dc73d..c1216baabf8 100644 --- a/include/llvm/AbstractTypeUser.h +++ b/include/llvm/AbstractTypeUser.h @@ -1,33 +1,25 @@ //===-- llvm/AbstractTypeUser.h - AbstractTypeUser Interface ----*- C++ -*-===// -// -// 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. -// -//===----------------------------------------------------------------------===// +// The LLVM Compiler Infrastructure // -// The AbstractTypeUser class is an interface to be implemented by classes who -// could possible use an abstract type. Abstract types are denoted by the -// isAbstract flag set to true in the Type class. These are classes that -// contain an Opaque type in their structure somehow. +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // -// 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 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. +//===----------------------------------------------------------------------===// // -// In addition to this, AbstractTypeUsers must keep the use list of the -// potentially abstract type that they reference up-to-date. To do this in a -// nice, transparent way, the PATypeHandle class is used to hold "Potentially -// Abstract Types", and keep the use list of the abstract types up-to-date. +// This file declares the AbstractTypeUser class. // //===----------------------------------------------------------------------===// #ifndef LLVM_ABSTRACT_TYPE_USER_H #define LLVM_ABSTRACT_TYPE_USER_H +#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 Whether this file needs it or not, // it must always include for the files which include // llvm/AbstractTypeUser.h @@ -39,9 +31,27 @@ namespace llvm { -struct Type; +class Type; class DerivedType; +template 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 +/// isAbstract flag set to true in the Type class. These are classes that +/// contain an Opaque type in their structure somewhere. +/// +/// 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 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. +/// +/// In addition to this, AbstractTypeUsers must keep the use list of the +/// potentially abstract type that they reference up-to-date. To do this in a +/// nice, transparent way, the PATypeHandle class is used to hold "Potentially +/// Abstract Types", and keep the use list of the abstract types up-to-date. +/// @brief LLVM Abstract Type User Representation class AbstractTypeUser { protected: virtual ~AbstractTypeUser(); // Derive from me @@ -52,7 +62,7 @@ public: /// its internal state to reference NewType instead of OldType. /// virtual void refineAbstractType(const DerivedType *OldTy, - const Type *NewTy) = 0; + 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 @@ -79,7 +89,7 @@ class PATypeHandle { void removeUser(); public: // ctor - Add use to type if abstract. Note that Ty must not be null - inline PATypeHandle(const Type *ty, AbstractTypeUser *user) + inline PATypeHandle(const Type *ty, AbstractTypeUser *user) : Ty(ty), User(user) { addUser(); } @@ -117,14 +127,6 @@ public: // operator-> - Allow user to dereference handle naturally... inline const Type *operator->() const { return Ty; } - - // removeUserFromConcrete - This function should be called when the User is - // notified that our type is refined... and the type is being refined to - // itself, which is now a concrete type. When a type becomes concrete like - // this, we MUST remove ourself from the AbstractTypeUser list, even though - // the type is apparently concrete. - // - void removeUserFromConcrete(); }; @@ -135,6 +137,7 @@ public: /// class PATypeHolder { mutable const Type *Ty; + void destroy(); public: PATypeHolder(const Type *ty) : Ty(ty) { addRef(); @@ -143,7 +146,7 @@ public: addRef(); } - ~PATypeHolder() { dropRef(); } + ~PATypeHolder() { if (Ty) dropRef(); } operator Type *() const { return get(); } Type *get() const; @@ -164,11 +167,31 @@ public: return operator=(H.Ty); } + /// getRawType - This should only be used to implement the vmcore library. + /// + const Type *getRawType() const { return Ty; } + 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 { + typedef const Type* SimpleType; + static SimpleType getSimplifiedValue(const PATypeHolder &Val) { + return static_cast(Val.get()); + } +}; +template<> struct simplify_type { + typedef const Type* SimpleType; + static SimpleType getSimplifiedValue(const PATypeHolder &Val) { + return static_cast(Val.get()); + } +}; + } // End llvm namespace #endif