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fe97523a2a
Also rename a bunch of things to say 'Class' in them in preparation for other refactoring. Swift SVN r2890
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
//===--- ClassMetadataLayout.h - CRTP for class metadata --------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// A CRTP helper class for class metadata.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_CLASSMETADATALAYOUT_H
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#define SWIFT_IRGEN_CLASSMETADATALAYOUT_H
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#include "llvm/ADT/SmallVector.h"
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#include "swift/AST/Decl.h"
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#include "GenProto.h"
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namespace swift {
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namespace irgen {
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class IRGenModule;
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/// A CRTP class for laying out class metadata. Note that this does
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/// *not* handle the metadata template stuff.
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template <class Impl> class ClassMetadataLayout {
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Impl &asImpl() { return *static_cast<Impl*>(this); }
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protected:
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IRGenModule &IGM;
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/// The most-derived class.
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ClassDecl *const TargetClass;
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ClassMetadataLayout(IRGenModule &IGM, ClassDecl *targetClass)
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: IGM(IGM), TargetClass(targetClass) {}
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public:
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void layout() {
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// Common fields.
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asImpl().addMetadataFlags();
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asImpl().addValueWitnessTable();
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asImpl().addDestructorFunction();
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asImpl().addSizeFunction();
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// Class-specific fields.
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asImpl().addClassFields(TargetClass);
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}
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protected:
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/// Add fields associated with the given class and its bases.
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void addClassFields(ClassDecl *theClass) {
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// TODO: base class
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// TODO: virtual methods
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if (auto generics = theClass->getGenericParamsOfContext()) {
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addGenericClassFields(theClass, *generics);
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}
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}
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/// Add fields related to the generics of this class declaration.
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/// TODO: don't add new fields that are implied by base class
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/// fields. e.g., if B<T> extends A<T>, the witness for T in A's
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/// section should be enough.
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void addGenericClassFields(ClassDecl *theClass,
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const GenericParamList &generics) {
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SmallVector<llvm::Type*, 4> signature;
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expandPolymorphicSignature(IGM, generics, signature);
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for (auto type : signature) {
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asImpl().addGenericWitness(theClass, type);
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}
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}
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};
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} // end namespace irgen
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} // end namespace swift
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#endif
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