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1ee2db4520
Accessors logically belong to their storage and can be synthesized on the fly, so removing them from the members list eliminates one source of mutability (but doesn't eliminate it; there are also witnesses for derived conformances, and implicit constructors). Since a few ASTWalker implementations break in non-trivial ways when the traversal is changed to visit accessors as children of the storage rather than peers, I hacked up the ASTWalker to optionally preserve the old traversal order for now. This is ugly and needs to be cleaned up, but I want to avoid breaking _too_ much with this commit.
133 lines
4.4 KiB
C++
133 lines
4.4 KiB
C++
//===--- DerivedConformanceError.cpp - Derived Error ----------------------===//
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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 implements implicit derivation of the Error
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// protocol.
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//
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//===----------------------------------------------------------------------===//
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#include "TypeChecker.h"
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#include "DerivedConformances.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/Stmt.h"
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#include "swift/AST/Expr.h"
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#include "swift/AST/Module.h"
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#include "swift/AST/Types.h"
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#include "swift/AST/SwiftNameTranslation.h"
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using namespace swift;
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using namespace swift::objc_translation;
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static std::pair<BraceStmt *, bool>
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deriveBodyBridgedNSError_enum_nsErrorDomain(AbstractFunctionDecl *domainDecl,
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void *) {
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// enum SomeEnum {
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// @derived
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// static var _nsErrorDomain: String {
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// return String(reflecting: self)
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// }
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// }
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auto M = domainDecl->getParentModule();
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auto &C = M->getASTContext();
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auto self = domainDecl->getImplicitSelfDecl();
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auto selfRef = new (C) DeclRefExpr(self, DeclNameLoc(), /*implicit*/ true);
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auto stringType = TypeExpr::createForDecl(SourceLoc(), C.getStringDecl(),
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domainDecl, /*implicit*/ true);
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auto initReflectingCall =
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CallExpr::createImplicit(C, stringType,
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{ selfRef }, { C.getIdentifier("reflecting") });
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auto ret =
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new (C) ReturnStmt(SourceLoc(), initReflectingCall, /*implicit*/ true);
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auto body = BraceStmt::create(C, SourceLoc(), ASTNode(ret), SourceLoc());
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return { body, /*isTypeChecked=*/false };
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}
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static std::pair<BraceStmt *, bool>
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deriveBodyBridgedNSError_printAsObjCEnum_nsErrorDomain(
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AbstractFunctionDecl *domainDecl, void *) {
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// enum SomeEnum {
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// @derived
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// static var _nsErrorDomain: String {
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// return "ModuleName.SomeEnum"
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// }
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// }
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auto M = domainDecl->getParentModule();
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auto &C = M->getASTContext();
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auto TC = domainDecl->getInnermostTypeContext();
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auto ED = TC->getSelfEnumDecl();
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StringRef value(C.AllocateCopy(getErrorDomainStringForObjC(ED)));
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auto string = new (C) StringLiteralExpr(value, SourceRange(), /*implicit*/ true);
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auto ret = new (C) ReturnStmt(SourceLoc(), string, /*implicit*/ true);
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auto body = BraceStmt::create(C, SourceLoc(),
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ASTNode(ret),
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SourceLoc());
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return { body, /*isTypeChecked=*/false };
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}
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static ValueDecl *
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deriveBridgedNSError_enum_nsErrorDomain(
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DerivedConformance &derived,
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std::pair<BraceStmt *, bool> (*synthesizer)(AbstractFunctionDecl *, void*)) {
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// enum SomeEnum {
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// @derived
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// static var _nsErrorDomain: String {
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// ...
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// }
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// }
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ASTContext &C = derived.TC.Context;
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auto stringTy = C.getStringDecl()->getDeclaredType();
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// Define the property.
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VarDecl *propDecl;
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PatternBindingDecl *pbDecl;
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std::tie(propDecl, pbDecl) = derived.declareDerivedProperty(
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C.Id_nsErrorDomain, stringTy, stringTy, /*isStatic=*/true,
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/*isFinal=*/true);
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// Define the getter.
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auto getterDecl = derived.addGetterToReadOnlyDerivedProperty(
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propDecl, stringTy);
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getterDecl->setBodySynthesizer(synthesizer);
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derived.addMembersToConformanceContext({propDecl, pbDecl});
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return propDecl;
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}
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ValueDecl *DerivedConformance::deriveBridgedNSError(ValueDecl *requirement) {
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if (!isa<EnumDecl>(Nominal))
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return nullptr;
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if (requirement->getBaseName() == TC.Context.Id_nsErrorDomain) {
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auto synthesizer = deriveBodyBridgedNSError_enum_nsErrorDomain;
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auto scope = Nominal->getFormalAccessScope(Nominal->getModuleScopeContext());
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if (scope.isPublic() || scope.isInternal())
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// PrintAsObjC may print this domain, so we should make sure we use the
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// same string it will.
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synthesizer = deriveBodyBridgedNSError_printAsObjCEnum_nsErrorDomain;
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return deriveBridgedNSError_enum_nsErrorDomain(*this, synthesizer);
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}
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TC.diagnose(requirement->getLoc(), diag::broken_errortype_requirement);
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return nullptr;
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}
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