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//===--- NecessaryBindings.h - Optimizing archetype bindings ----*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file defines a utility class for saving and restoring the
// archetype metadata necessary in order to carry out value operations
// on a type.
//
// This is a supplemental API of GenProto.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_NECESSARYBINDINGS_H
#define SWIFT_IRGEN_NECESSARYBINDINGS_H
#include "GenericRequirement.h"
#include "llvm/ADT/SetVector.h"
#include "swift/AST/Types.h"
namespace swift {
class CanType;
enum class MetadataState : size_t;
class ProtocolDecl;
class ProtocolConformanceRef;
class SpecializedProtocolConformance;
namespace irgen {
class Address;
class Explosion;
class IRGenFunction;
class IRGenModule;
class Size;
/// NecessaryBindings - The set of metadata that must be saved in
/// order to perform some set of operations on a type.
class NecessaryBindings {
llvm::SetVector<GenericRequirement> RequirementsSet;
SubstitutionMap SubMap;
bool NoEscape;
public:
NecessaryBindings() {}
NecessaryBindings(SubstitutionMap subs, bool noEscape)
: SubMap(subs), NoEscape(noEscape) {}
SubstitutionMap getSubstitutionMap() const {
return SubMap;
}
/// Collect the necessary bindings to invoke a function with the given
/// signature.
static NecessaryBindings forPartialApplyForwarder(IRGenModule &IGM,
CanSILFunctionType origType,
SubstitutionMap subs,
bool noEscape,
bool considerParameterSources);
void addRequirement(GenericRequirement requirement) {
auto type = requirement.getTypeParameter().subst(SubMap);
if (!type->hasArchetype())
return;
RequirementsSet.insert(requirement);
}
/// Get the requirement from the bindings at index i.
const GenericRequirement &operator[](size_t i) const {
return RequirementsSet[i];
}
size_t size() const { return getRequirements().size(); }
/// Is the work to do trivial?
bool empty() const { return getRequirements().empty(); }
/// Returns the required size of the bindings.
/// Pointer alignment is sufficient.
Size getBufferSize(IRGenModule &IGM) const;
/// Save the necessary bindings to the given buffer.
void save(IRGenFunction &IGF, Address buffer) const;
/// Restore the necessary bindings from the given buffer.
void restore(IRGenFunction &IGF, Address buffer, MetadataState state) const;
const llvm::ArrayRef<GenericRequirement> getRequirements() const {
return RequirementsSet.getArrayRef();
}
private:
void computeBindings(IRGenModule &IGM,
CanSILFunctionType origType,
bool considerParameterSources);
};
} // end namespace irgen
} // end namespace swift
#endif
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