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b5e79d5590
Noncopyable types may have user-defined code in their `deinit`s that requires passing the type's generic parameters, so a box for a captured noncopyable type needs to capture the generic environment even when the captured type is fixed- layout. Fixes rdar://138958210.
118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
//===--- NecessaryBindings.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 - 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 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 "GenericRequirement.h"
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#include "llvm/ADT/SetVector.h"
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#include "swift/AST/Types.h"
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namespace swift {
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class CanType;
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enum class MetadataState : size_t;
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class ProtocolDecl;
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class ProtocolConformanceRef;
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class SpecializedProtocolConformance;
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namespace irgen {
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class Address;
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class Explosion;
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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 some set of operations on a type.
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class NecessaryBindings {
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llvm::SetVector<GenericRequirement> RequirementsSet;
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SubstitutionMap SubMap;
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bool NoEscape;
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public:
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NecessaryBindings() {}
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NecessaryBindings(SubstitutionMap subs, bool noEscape)
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: SubMap(subs), NoEscape(noEscape) {}
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SubstitutionMap getSubstitutionMap() const {
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return SubMap;
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}
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/// Collect the necessary bindings to invoke a function with the given
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/// signature.
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static NecessaryBindings forPartialApplyForwarder(IRGenModule &IGM,
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CanSILFunctionType origType,
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SubstitutionMap subs,
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bool noEscape,
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bool considerParameterSources);
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/// Collect the necessary bindings to be able to destroy a value inside of a
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/// fixed-layout boxed allocation.
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static NecessaryBindings forFixedBox(IRGenModule &IGM,
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SILBoxType *box);
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void addRequirement(GenericRequirement requirement) {
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auto type = requirement.getTypeParameter().subst(SubMap);
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if (!type->hasArchetype())
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return;
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RequirementsSet.insert(requirement);
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}
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/// Get the requirement from the bindings at index i.
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const GenericRequirement &operator[](size_t i) const {
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return RequirementsSet[i];
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}
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size_t size() const { return getRequirements().size(); }
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/// Is the work to do trivial?
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bool empty() const { return getRequirements().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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///
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/// If `replacementSubs` has a value, then the bindings saved are taken from
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/// the given substitution map instead of the substitutions
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void save(IRGenFunction &IGF, Address buffer,
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std::optional<SubstitutionMap> replacementSubs = std::nullopt)
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const;
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/// Restore the necessary bindings from the given buffer.
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void restore(IRGenFunction &IGF, Address buffer, MetadataState state) const;
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const llvm::ArrayRef<GenericRequirement> getRequirements() const {
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return RequirementsSet.getArrayRef();
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}
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private:
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void computeBindings(IRGenModule &IGM,
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CanSILFunctionType origType,
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bool considerParameterSources);
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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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