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9a6126b148
Another refactoring in preparation for adding the new type of class metadata emitted when deploying to a target with a new Objective-C runtime. Progress on <rdar://problem/47649465>.
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
//===--- ClassLayout.cpp - Layout of class instances ---------------------===//
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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 - 2017 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 https://swift.org/LICENSE.txt for license information
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// See https://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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// This file implements algorithms for laying out class instances.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/AST/ASTContext.h"
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#include "IRGenFunction.h"
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#include "IRGenModule.h"
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#include "ClassLayout.h"
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#include "TypeInfo.h"
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using namespace swift;
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using namespace irgen;
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ClassLayout::ClassLayout(const StructLayoutBuilder &builder,
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ClassMetadataOptions options,
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llvm::Type *classTy,
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ArrayRef<VarDecl *> allStoredProps,
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ArrayRef<FieldAccess> allFieldAccesses,
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ArrayRef<ElementLayout> allElements)
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: MinimumAlign(builder.getAlignment()),
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MinimumSize(builder.getSize()),
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IsFixedLayout(builder.isFixedLayout()),
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Options(options),
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Ty(classTy),
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AllStoredProperties(allStoredProps),
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AllFieldAccesses(allFieldAccesses),
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AllElements(allElements) { }
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Size ClassLayout::getInstanceStart() const {
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if (AllElements.empty())
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return getSize();
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auto element = AllElements[0];
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if (element.getKind() == ElementLayout::Kind::Fixed ||
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element.getKind() == ElementLayout::Kind::Empty) {
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// FIXME: assumes layout is always sequential!
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return element.getByteOffset();
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}
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return Size(0);
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}
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