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ce7ddef710
The motivations here are that (1) the parametric types that actually need the 'self' argument don't necessarily all want to do what tuples do and put the VWT relative to the metatype at some definable offset and (2) recovering type parameters from the metatype is much better defined than also hopping some relationship back. Plus this allows VWTs to be shared across instances of generic types. Also, I'm going to need to add a VW that takes a metatype, and consistency seems right here. If keeping two values live is actually punishing, I might have to reconsider this. But the VWT is at least always recoverable from the metatype, so.... I ended up abstracting the thing that GenHeap was doing in order to save archetypes for arrays, because I needed it to save metatypes instead of VWTs and because it really needed abstractin'. Swift SVN r3096
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
//===--- NecessaryBindigns.h - Optimizing archetype bindings ----*- 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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// This file defines a utility class for saving and restoring the
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// archetype metadata necessary in order to carry out value operations
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// on a type.
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//
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// This is a supplemental API of GenProto.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_IRGEN_NECESSARYBINDINGS_H
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#define SWIFT_IRGEN_NECESSARYBINDINGS_H
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#include "llvm/ADT/SetVector.h"
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namespace swift {
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class ArchetypeType;
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namespace irgen {
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class Address;
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class IRGenFunction;
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class IRGenModule;
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class Size;
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/// NecessaryBindings - The set of metadata that must be saved in
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/// order to perform value operations on the target type.
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class NecessaryBindings {
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llvm::SetVector<ArchetypeType*> Types;
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public:
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NecessaryBindings(IRGenModule &IGM, CanType type);
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/// Is the work to do trivial?
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bool empty() const { return Types.empty(); }
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/// Returns the required size of the bindings.
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/// Pointer alignment is sufficient.
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Size getBufferSize(IRGenModule &IGM) const;
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/// Save the necessary bindings to the given buffer.
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void save(IRGenFunction &IGF, Address buffer) const;
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/// Restore the necessary bindings from the given buffer.
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void restore(IRGenFunction &IGF, Address buffer) const;
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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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