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09d0cfee8d
Now we can discern the types of values in heap boxes at runtime! Closure reference captures are a common way of creating reference cycles, so this provides some basic infrastructure for detecting those someday. A closure capture descriptor has the following: - The number of captures. - The number of sources of metadata reachable from the closure. This is important for substituting generics at runtime since we can't know precisely what will get captured until we observe a closure. - The number of types in the NecessaryBindings structure. This is a holding tank in a closure for sources of metadata that can't be gotten from the captured values themselves. - The metadata source map, a list of pairs, for each source of metadata for every generic argument needed to perform substitution at runtime. Key: The typeref for the generic parameter visible from the closure in the Swift source. Value: The metadata source, which describes how to crawl the heap from the closure to get to the metadata for that generic argument. - A list of typerefs for the captured values themselves. Follow-up: IRGen tests for various capture scenarios, which will include MetadataSource encoding tests. rdar://problem/24989531
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
//===--- MetadataSourceBuilder.h - Swift Metadata Source Builder --------*- 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 - 2016 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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// Implements utilities for constructing MetadataSources.
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_REFLECTION_METADATASOURCEBUILDER_H
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#define SWIFT_REFLECTION_METADATASOURCEBUILDER_H
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#include "swift/Reflection/MetadataSource.h"
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namespace swift {
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namespace reflection {
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class MetadataSourceBuilder {
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std::vector<std::unique_ptr<const MetadataSource>> MetadataSourcePool;
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public:
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using Source = const MetadataSource *;
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MetadataSourceBuilder() {}
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MetadataSourceBuilder(const MetadataSourceBuilder &Other) = delete;
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MetadataSourceBuilder &operator=(const MetadataSourceBuilder &Other) = delete;
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template <typename MetadataSourceTy, typename... Args>
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MetadataSourceTy *make_source(Args... args) {
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auto MS = new MetadataSourceTy(::std::forward<Args>(args)...);
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MetadataSourcePool.push_back(std::unique_ptr<const MetadataSource>(MS));
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return MS;
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}
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const GenericArgumentMetadataSource *
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createGenericArgument(unsigned Index, const MetadataSource *Source) {
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return GenericArgumentMetadataSource::create(*this, Index, Source);
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}
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const MetadataCaptureMetadataSource *
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createMetadataCapture(unsigned Index) {
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return MetadataCaptureMetadataSource::create(*this, Index);
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}
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const ReferenceCaptureMetadataSource *
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createReferenceCapture(unsigned Index) {
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return ReferenceCaptureMetadataSource::create(*this, Index);
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}
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const ClosureBindingMetadataSource *
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createClosureBinding(unsigned Index) {
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return ClosureBindingMetadataSource::create(*this, Index);
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}
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const ParentMetadataSource *
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createParent(const MetadataSource *Child) {
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return ParentMetadataSource::create(*this, Child);
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}
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};
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} // end namespace reflection
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} // end namespace swift
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#endif // SWIFT_REFLECTION_METADATASOURCEBUILDER_H
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