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Now that TypeChecker is being used to check all sorts of things (not all from a single TU), it's not really correct to have a single top-level TU that gets used everywhere. Instead, we should be using the TU that's appropriate for whatever's being checked. This is a small correctness win for order-independent type-checking, but is critical for multi-file translation units, which is needed for implicit visibility. This basically involves passing around DeclContexts much more. Caveat: we aren't smart about, say, filtering extensions based on the current context, so we're still not 100% correct here. Swift SVN r9006
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===--- LazyResolver.h - Lazy Resolution for ASTs --------------*- 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 the LazyResolver abstract interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_AST_LAZYRESOLVER_H
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#define SWIFT_AST_LAZYRESOLVER_H
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#include "swift/Basic/Optional.h"
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namespace swift {
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class DeclContext;
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class ExtensionDecl;
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class Identifier;
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class NominalTypeDecl;
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class ProtocolConformance;
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class ProtocolDecl;
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class Type;
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class ValueDecl;
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/// Abstract interface used to lazily resolve aspects of the AST, such as the
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/// types of declarations or protocol conformance structures.
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class LazyResolver {
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public:
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virtual ~LazyResolver();
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/// Resolve the conformance of the given nominal type to the given protocol.
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///
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/// \param type The nominal type that conforms to the given protocol.
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////
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/// \param protocol The protocol to which the type conforms.
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///
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/// \param ext If the conforms occurs via an extension, the extension
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/// declaration.
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///
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/// \returns the protocol conformance, or null if the type does not conform
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/// to the protocol.
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virtual ProtocolConformance *resolveConformance(NominalTypeDecl *type,
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ProtocolDecl *protocol,
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ExtensionDecl *ext) = 0;
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/// Resolve the "existential conforms to itself" bit for the given protocol.
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virtual void resolveExistentialConformsToItself(ProtocolDecl *proto) = 0;
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/// Resolve a member type.
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///
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/// \param dc The context in which to resolve the type.
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/// \param type The type in which we will search for the member type.
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/// \param name The name of the member type.
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///
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/// \returns the member type, or an empty type if no such type could be
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/// found.
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virtual Type resolveMemberType(DeclContext *dc, Type type,
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Identifier name) = 0;
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/// Resolve the type and declaration attributes of a value.
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///
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/// This can be called when the type or signature of a value is needed.
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/// It does not perform full type-checking, only checks for basic
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/// consistency and provides the value a type.
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virtual void resolveDeclSignature(ValueDecl *VD) = 0;
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};
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}
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#endif // LLVM_SWIFT_AST_LAZYRESOLVER_H
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