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having the compiler emit RTTI and vtables to EVERY translation unit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11871 91177308-0d34-0410-b5e6-96231b3b80d8
175 lines
5.6 KiB
C++
175 lines
5.6 KiB
C++
//===-- llvm/AbstractTypeUser.h - AbstractTypeUser Interface ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The AbstractTypeUser class is an interface to be implemented by classes who
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// could possible use an abstract type. Abstract types are denoted by the
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// isAbstract flag set to true in the Type class. These are classes that
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// contain an Opaque type in their structure somehow.
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//
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// Classes must implement this interface so that they may be notified when an
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// abstract type is resolved. Abstract types may be resolved into more concrete
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// types through: linking, parsing, and bytecode reading. When this happens,
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// all of the users of the type must be updated to reference the new, more
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// concrete type. They are notified through the AbstractTypeUser interface.
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//
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// In addition to this, AbstractTypeUsers must keep the use list of the
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// potentially abstract type that they reference up-to-date. To do this in a
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// nice, transparent way, the PATypeHandle class is used to hold "Potentially
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// Abstract Types", and keep the use list of the abstract types up-to-date.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ABSTRACT_TYPE_USER_H
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#define LLVM_ABSTRACT_TYPE_USER_H
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// This is the "master" include for <cassert> Whether this file needs it or not,
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// it must always include <cassert> for the files which include
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// llvm/AbstractTypeUser.h
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//
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// In this way, most every LLVM source file will have access to the assert()
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// macro without having to #include <cassert> directly.
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//
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#include <cassert>
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namespace llvm {
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class Type;
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class DerivedType;
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class AbstractTypeUser {
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protected:
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virtual ~AbstractTypeUser(); // Derive from me
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public:
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/// refineAbstractType - The callback method invoked when an abstract type is
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/// resolved to another type. An object must override this method to update
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/// its internal state to reference NewType instead of OldType.
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///
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virtual void refineAbstractType(const DerivedType *OldTy,
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const Type *NewTy) = 0;
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/// The other case which AbstractTypeUsers must be aware of is when a type
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/// makes the transition from being abstract (where it has clients on it's
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/// AbstractTypeUsers list) to concrete (where it does not). This method
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/// notifies ATU's when this occurs for a type.
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///
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virtual void typeBecameConcrete(const DerivedType *AbsTy) = 0;
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// for debugging...
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virtual void dump() const = 0;
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};
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/// PATypeHandle - Handle to a Type subclass. This class is used to keep the
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/// use list of abstract types up-to-date.
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///
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class PATypeHandle {
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const Type *Ty;
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AbstractTypeUser * const User;
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// These functions are defined at the bottom of Type.h. See the comment there
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// for justification.
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void addUser();
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void removeUser();
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public:
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// ctor - Add use to type if abstract. Note that Ty must not be null
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inline PATypeHandle(const Type *ty, AbstractTypeUser *user)
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: Ty(ty), User(user) {
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addUser();
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}
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// ctor - Add use to type if abstract.
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inline PATypeHandle(const PATypeHandle &T) : Ty(T.Ty), User(T.User) {
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addUser();
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}
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// dtor - Remove reference to type...
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inline ~PATypeHandle() { removeUser(); }
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// Automatic casting operator so that the handle may be used naturally
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inline operator const Type *() const { return Ty; }
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inline const Type *get() const { return Ty; }
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// operator= - Allow assignment to handle
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inline const Type *operator=(const Type *ty) {
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if (Ty != ty) { // Ensure we don't accidentally drop last ref to Ty
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removeUser();
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Ty = ty;
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addUser();
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}
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return Ty;
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}
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// operator= - Allow assignment to handle
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inline const Type *operator=(const PATypeHandle &T) {
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return operator=(T.Ty);
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}
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inline bool operator==(const Type *ty) {
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return Ty == ty;
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}
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// operator-> - Allow user to dereference handle naturally...
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inline const Type *operator->() const { return Ty; }
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// removeUserFromConcrete - This function should be called when the User is
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// notified that our type is refined... and the type is being refined to
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// itself, which is now a concrete type. When a type becomes concrete like
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// this, we MUST remove ourself from the AbstractTypeUser list, even though
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// the type is apparently concrete.
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//
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void removeUserFromConcrete();
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};
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/// PATypeHolder - Holder class for a potentially abstract type. This uses
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/// efficient union-find techniques to handle dynamic type resolution. Unless
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/// you need to do custom processing when types are resolved, you should always
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/// use PATypeHolders in preference to PATypeHandles.
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///
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class PATypeHolder {
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mutable const Type *Ty;
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public:
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PATypeHolder(const Type *ty) : Ty(ty) {
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addRef();
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}
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PATypeHolder(const PATypeHolder &T) : Ty(T.Ty) {
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addRef();
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}
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~PATypeHolder() { dropRef(); }
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operator const Type *() const { return get(); }
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const Type *get() const;
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// operator-> - Allow user to dereference handle naturally...
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const Type *operator->() const { return get(); }
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// operator= - Allow assignment to handle
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const Type *operator=(const Type *ty) {
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if (Ty != ty) { // Don't accidentally drop last ref to Ty.
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dropRef();
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Ty = ty;
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addRef();
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}
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return get();
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}
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const Type *operator=(const PATypeHolder &H) {
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return operator=(H.Ty);
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}
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private:
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void addRef();
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void dropRef();
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};
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} // End llvm namespace
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#endif
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