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cb7c2b4fce
Introduce three new requests for name lookup operations that avoid performing type checking/semantic analysis. They work using syntactic information (e.g., TypeReprs) and AST-level name lookup operations that will (eventually) avoid and calls back into type checking. The new requests are: * Retrieve the superclass declaration of a protocol or class declaration. Use this request for ClassDecl::getSuperclassDecl() and ProtocolDecl::getSuperclassDecl(). * Retrieve the types “directly referenced” by a particular location in an inheritance clause. This query is based on looking at the TypeReprs and performing fairly-minimal lookup, so it does not involve any Type computations. * Retrieve the types “directly referenced” by the underlying type of a typealias. This query allows us to desugar a typealias without forming a type. Along with these is a core operation to transform a set of TypeDecl*s into a set of NominalTypeDecl*s, looking through typealiases, and without involving Type at all. The superclass-decl request does this to find a ClassDecl; other requests will eventually do this to (e.g.) find all of the protocols mentioned in an inheritance clause.
101 lines
4.2 KiB
C++
101 lines
4.2 KiB
C++
//===--- NameLookupRequests.cpp - Name Lookup Requests --------------------===//
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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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#include "swift/AST/NameLookupRequests.h"
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#include "swift/Subsystems.h"
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#include "swift/AST/Evaluator.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Module.h"
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using namespace swift;
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namespace swift {
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// Implement the name lookup type zone.
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#define SWIFT_TYPEID_ZONE SWIFT_NAME_LOOKUP_REQUESTS_TYPEID_ZONE
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#define SWIFT_TYPEID_HEADER "swift/AST/NameLookupTypeIDZone.def"
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#include "swift/Basic/ImplementTypeIDZone.h"
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#undef SWIFT_TYPEID_ZONE
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#undef SWIFT_TYPEID_HEADER
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}
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//----------------------------------------------------------------------------//
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// Referenced inherited decls computation.
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//----------------------------------------------------------------------------//
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TypeLoc &InheritedDeclsReferencedRequest::getTypeLoc(
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llvm::PointerUnion<TypeDecl *, ExtensionDecl *> decl,
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unsigned index) const {
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// FIXME: Copy-pasted from InheritedTypeRequest. We need to consolidate here.
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if (auto typeDecl = decl.dyn_cast<TypeDecl *>())
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return typeDecl->getInherited()[index];
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return decl.get<ExtensionDecl *>()->getInherited()[index];
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}
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void InheritedDeclsReferencedRequest::diagnoseCycle(
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DiagnosticEngine &diags) const {
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const auto &storage = getStorage();
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auto &typeLoc = getTypeLoc(std::get<0>(storage), std::get<1>(storage));
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diags.diagnose(typeLoc.getLoc(), diag::circular_reference);
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}
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void InheritedDeclsReferencedRequest::noteCycleStep(
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DiagnosticEngine &diags) const {
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const auto &storage = getStorage();
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auto &typeLoc = getTypeLoc(std::get<0>(storage), std::get<1>(storage));
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diags.diagnose(typeLoc.getLoc(), diag::circular_reference_through);
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}
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//----------------------------------------------------------------------------//
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// Referenced underlying type declarations computation.
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//----------------------------------------------------------------------------//
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void UnderlyingTypeDeclsReferencedRequest::diagnoseCycle(
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DiagnosticEngine &diags) const {
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// FIXME: Improve this diagnostic.
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auto subjectDecl = std::get<0>(getStorage());
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diags.diagnose(subjectDecl, diag::circular_reference);
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}
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void UnderlyingTypeDeclsReferencedRequest::noteCycleStep(
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DiagnosticEngine &diags) const {
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auto subjectDecl = std::get<0>(getStorage());
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// FIXME: Customize this further.
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diags.diagnose(subjectDecl, diag::circular_reference_through);
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}
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//----------------------------------------------------------------------------//
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// Superclass declaration computation.
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//----------------------------------------------------------------------------//
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void SuperclassDeclRequest::diagnoseCycle(DiagnosticEngine &diags) const {
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// FIXME: Improve this diagnostic.
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auto subjectDecl = std::get<0>(getStorage());
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diags.diagnose(subjectDecl, diag::circular_reference);
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}
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void SuperclassDeclRequest::noteCycleStep(DiagnosticEngine &diags) const {
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auto subjectDecl = std::get<0>(getStorage());
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// FIXME: Customize this further.
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diags.diagnose(subjectDecl, diag::circular_reference_through);
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}
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// Define request evaluation functions for each of the name lookup requests.
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static AbstractRequestFunction *nameLookupRequestFunctions[] = {
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#define SWIFT_TYPEID(Name) \
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reinterpret_cast<AbstractRequestFunction *>(&Name::evaluateRequest),
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#include "swift/AST/NameLookupTypeIDZone.def"
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#undef SWIFT_TYPEID
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};
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void swift::registerNameLookupRequestFunctions(Evaluator &evaluator) {
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evaluator.registerRequestFunctions(SWIFT_NAME_LOOKUP_REQUESTS_TYPEID_ZONE,
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nameLookupRequestFunctions);
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}
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