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1f971f88dd
This frees up an extra bit in SILType, which we can expose to LLVM through PointerLikeTypeTraits. Use this bit in a PointerUnion, which allows simplifying ValueBase, which happened to be the last use of the isInvalid() state. Swift SVN r5218
88 lines
2.9 KiB
C++
88 lines
2.9 KiB
C++
//===--- SILModule.cpp - SILModule implementation -------------------------===//
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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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#include "swift/SIL/SILModule.h"
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#include "swift/SIL/SILValue.h"
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#include "llvm/ADT/FoldingSet.h"
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using namespace swift;
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namespace swift {
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/// SILTypeList - The uniqued backing store for the SILValue type list. This
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/// is only exposed out of SILValue as an ArrayRef of types, so it should
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/// never be used outside of libSIL.
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class SILTypeList : public llvm::FoldingSetNode {
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public:
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unsigned NumTypes;
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SILType Types[1]; // Actually variable sized.
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void Profile(llvm::FoldingSetNodeID &ID) const {
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for (unsigned i = 0, e = NumTypes; i != e; ++i) {
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ID.AddPointer(Types[i].getOpaqueValue());
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}
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}
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};
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} // end namespace swift.
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/// SILTypeListUniquingType - This is the type of the folding set maintained by
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/// SILModule that these things are uniqued into.
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typedef llvm::FoldingSet<SILTypeList> SILTypeListUniquingType;
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SILModule::SILModule(ASTContext &Context)
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: TheASTContext(Context), Types(*this) {
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TypeListUniquing = new SILTypeListUniquingType();
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}
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SILModule::~SILModule() {
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delete (SILTypeListUniquingType*)TypeListUniquing;
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}
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ArrayRef<SILType> ValueBase::getTypes() const {
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// No results.
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if (TypeOrTypeList.isNull())
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return ArrayRef<SILType>();
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// Arbitrary list of results.
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if (auto *TypeList = TypeOrTypeList.dyn_cast<SILTypeList*>())
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return ArrayRef<SILType>(TypeList->Types, TypeList->NumTypes);
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// Single result.
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return TypeOrTypeList.get<SILType>();
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}
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/// getSILTypeList - Get a uniqued pointer to a SIL type list. This can only
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/// be used by SILValue.
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SILTypeList *SILModule::getSILTypeList(ArrayRef<SILType> Types) const {
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assert(Types.size() > 1 && "Shouldn't use type list for 0 or 1 types");
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auto UniqueMap = (SILTypeListUniquingType*)TypeListUniquing;
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llvm::FoldingSetNodeID ID;
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for (auto T : Types) {
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ID.AddPointer(T.getOpaqueValue());
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}
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// If we already have this type list, just return it.
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void *InsertPoint = 0;
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if (SILTypeList *TypeList = UniqueMap->FindNodeOrInsertPos(ID, InsertPoint))
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return TypeList;
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// Otherwise, allocate a new one.
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void *NewListP = BPA.Allocate(sizeof(SILTypeList)+
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sizeof(SILType)*(Types.size()-1),
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alignof(SILTypeList));
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SILTypeList *NewList = new (NewListP) SILTypeList();
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NewList->NumTypes = Types.size();
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std::copy(Types.begin(), Types.end(), NewList->Types);
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UniqueMap->InsertNode(NewList, InsertPoint);
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return NewList;
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}
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