| //===--- ResilienceDiagnostics.cpp - Resilience Inlineability Diagnostics -===// |
| // |
| // 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 implements diagnostics for @inlinable. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "TypeChecker.h" |
| #include "swift/AST/Attr.h" |
| #include "swift/AST/Decl.h" |
| #include "swift/AST/Initializer.h" |
| #include "swift/AST/DeclContext.h" |
| |
| using namespace swift; |
| using FragileFunctionKind = TypeChecker::FragileFunctionKind; |
| |
| std::pair<FragileFunctionKind, bool> |
| TypeChecker::getFragileFunctionKind(const DeclContext *DC) { |
| for (; DC->isLocalContext(); DC = DC->getParent()) { |
| if (isa<DefaultArgumentInitializer>(DC)) { |
| // Default argument generators of public functions cannot reference |
| // @usableFromInline declarations; all other fragile function kinds |
| // can. |
| auto *VD = cast<ValueDecl>(DC->getInnermostDeclarationDeclContext()); |
| auto access = |
| VD->getFormalAccessScope(/*useDC=*/nullptr, |
| /*treatUsableFromInlineAsPublic=*/false); |
| return std::make_pair(FragileFunctionKind::DefaultArgument, |
| !access.isPublic()); |
| } |
| |
| if (isa<PatternBindingInitializer>(DC)) |
| return std::make_pair(FragileFunctionKind::PropertyInitializer, |
| /*treatUsableFromInlineAsPublic=*/true); |
| |
| if (auto *AFD = dyn_cast<AbstractFunctionDecl>(DC)) { |
| // If the function is a nested function, we will serialize its body if |
| // we serialize the parent's body. |
| if (AFD->getDeclContext()->isLocalContext()) |
| continue; |
| |
| // Bodies of public transparent and always-inline functions are |
| // serialized, so use conservative access patterns. |
| if (AFD->isTransparent()) |
| return std::make_pair(FragileFunctionKind::Transparent, |
| /*treatUsableFromInlineAsPublic=*/true); |
| |
| if (AFD->getAttrs().hasAttribute<InlinableAttr>()) |
| return std::make_pair(FragileFunctionKind::Inlinable, |
| /*treatUsableFromInlineAsPublic=*/true); |
| |
| if (auto attr = AFD->getAttrs().getAttribute<InlineAttr>()) |
| if (attr->getKind() == InlineKind::Always) |
| return std::make_pair(FragileFunctionKind::InlineAlways, |
| /*treatUsableFromInlineAsPublic=*/true); |
| |
| // If a property or subscript is @inlinable, the accessors are |
| // @inlinable also. |
| if (auto accessor = dyn_cast<AccessorDecl>(AFD)) |
| if (accessor->getStorage()->getAttrs().getAttribute<InlinableAttr>()) |
| return std::make_pair(FragileFunctionKind::Inlinable, |
| /*treatUsableFromInlineAsPublic=*/true); |
| } |
| } |
| |
| llvm_unreachable("Context is not nested inside a fragile function"); |
| } |
| |
| void TypeChecker::diagnoseInlinableLocalType(const NominalTypeDecl *NTD) { |
| auto *DC = NTD->getDeclContext(); |
| auto expansion = DC->getResilienceExpansion(); |
| if (expansion == ResilienceExpansion::Minimal) { |
| auto kind = getFragileFunctionKind(DC); |
| diagnose(NTD, diag::local_type_in_inlinable_function, |
| NTD->getFullName(), |
| static_cast<unsigned>(kind.first)); |
| } |
| } |
| |
| /// A uniquely-typed boolean to reduce the chances of accidentally inverting |
| /// a check. |
| enum class DowngradeToWarning: bool { |
| No, |
| Yes |
| }; |
| |
| bool TypeChecker::diagnoseInlinableDeclRef(SourceLoc loc, |
| const ValueDecl *D, |
| const DeclContext *DC, |
| FragileFunctionKind Kind, |
| bool TreatUsableFromInlineAsPublic) { |
| // Local declarations are OK. |
| if (D->getDeclContext()->isLocalContext()) |
| return false; |
| |
| // Type parameters are OK. |
| if (isa<AbstractTypeParamDecl>(D)) |
| return false; |
| |
| // Public declarations are OK. |
| if (D->getFormalAccessScope(/*useDC=*/nullptr, |
| TreatUsableFromInlineAsPublic).isPublic()) |
| return false; |
| |
| // Enum cases are handled as part of their containing enum. |
| if (isa<EnumElementDecl>(D)) |
| return false; |
| |
| // Protocol requirements are not versioned because there's no |
| // global entry point. |
| if (isa<ProtocolDecl>(D->getDeclContext()) && |
| D->isProtocolRequirement()) |
| return false; |
| |
| // Dynamic declarations are not versioned because there's no |
| // global entry point. |
| if (D->isDynamic()) |
| return false; |
| |
| DowngradeToWarning downgradeToWarning = DowngradeToWarning::No; |
| |
| // Swift 4.2 did not perform any checks for type aliases. |
| if (isa<TypeAliasDecl>(D)) { |
| if (!Context.isSwiftVersionAtLeast(4, 2)) |
| return false; |
| if (!Context.isSwiftVersionAtLeast(5)) |
| downgradeToWarning = DowngradeToWarning::Yes; |
| } |
| |
| auto diagID = diag::resilience_decl_unavailable; |
| if (downgradeToWarning == DowngradeToWarning::Yes) |
| diagID = diag::resilience_decl_unavailable_warn; |
| |
| diagnose(loc, diagID, |
| D->getDescriptiveKind(), D->getFullName(), |
| D->getFormalAccessScope().accessLevelForDiagnostics(), |
| static_cast<unsigned>(Kind)); |
| |
| if (TreatUsableFromInlineAsPublic) { |
| diagnose(D, diag::resilience_decl_declared_here, |
| D->getDescriptiveKind(), D->getFullName()); |
| } else { |
| diagnose(D, diag::resilience_decl_declared_here_public, |
| D->getDescriptiveKind(), D->getFullName()); |
| } |
| |
| return (downgradeToWarning == DowngradeToWarning::No); |
| } |
| |