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bbc4816861
I am going to expose this on TypeBase, so I am attempting to prevent a layering violation in between AST and Sema.
83 lines
3.3 KiB
C++
83 lines
3.3 KiB
C++
//===--- Concurrency.cpp --------------------------------------------------===//
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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 - 2024 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/Concurrency.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/ConformanceLookup.h"
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#include "swift/AST/Decl.h"
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#include "swift/AST/ProtocolConformance.h"
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#include "swift/AST/SourceFile.h"
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using namespace swift;
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std::optional<DiagnosticBehavior>
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swift::getConcurrencyDiagnosticBehaviorLimit(NominalTypeDecl *nominal,
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const DeclContext *fromDC,
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bool ignoreExplicitConformance) {
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ModuleDecl *importedModule = nullptr;
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if (nominal->getAttrs().hasAttribute<PreconcurrencyAttr>()) {
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// If the declaration itself has the @preconcurrency attribute,
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// respect it.
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importedModule = nominal->getParentModule();
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} else {
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// Determine whether this nominal type is visible via a @preconcurrency
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// import.
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auto import = nominal->findImport(fromDC);
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auto sourceFile = fromDC->getParentSourceFile();
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if (!import || !import->options.contains(ImportFlags::Preconcurrency))
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return std::nullopt;
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if (sourceFile)
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sourceFile->setImportUsedPreconcurrency(*import);
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importedModule = import->module.importedModule;
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}
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// When the type is explicitly non-Sendable, @preconcurrency imports
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// downgrade the diagnostic to a warning in Swift 6.
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if (!ignoreExplicitConformance && hasExplicitSendableConformance(nominal))
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return DiagnosticBehavior::Warning;
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// When the type is implicitly non-Sendable, `@preconcurrency` suppresses
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// diagnostics until the imported module enables Swift 6.
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return importedModule->isConcurrencyChecked() ? DiagnosticBehavior::Warning
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: DiagnosticBehavior::Ignore;
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}
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/// Determine whether the given nominal type has an explicit Sendable
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/// conformance (regardless of its availability).
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bool swift::hasExplicitSendableConformance(NominalTypeDecl *nominal,
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bool applyModuleDefault) {
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ASTContext &ctx = nominal->getASTContext();
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auto nominalModule = nominal->getParentModule();
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// In a concurrency-checked module, a missing conformance is equivalent to
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// an explicitly unavailable one. If we want to apply this rule, do so now.
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if (applyModuleDefault && nominalModule->isConcurrencyChecked())
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return true;
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// Look for any conformance to `Sendable`.
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auto proto = ctx.getProtocol(KnownProtocolKind::Sendable);
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if (!proto)
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return false;
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// Look for a conformance. If it's present and not (directly) missing,
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// we're done.
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auto conformance = lookupConformance(nominal->getDeclaredInterfaceType(),
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proto, /*allowMissing=*/true);
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return conformance &&
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!(isa<BuiltinProtocolConformance>(conformance.getConcrete()) &&
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cast<BuiltinProtocolConformance>(conformance.getConcrete())
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->isMissing());
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}
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