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TypeCheckAttr.cpp
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//===--- TypeCheckAttr.cpp - Type Checking for Attributes -----------------===//
//
// 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 semantic analysis for attributes.
//
//===----------------------------------------------------------------------===//
#include "MiscDiagnostics.h"
#include "TypeCheckAvailability.h"
#include "TypeCheckConcurrency.h"
#include "TypeCheckDistributed.h"
#include "TypeCheckMacros.h"
#include "TypeCheckObjC.h"
#include "TypeCheckType.h"
#include "TypeChecker.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/Decl.h"
#include "swift/AST/DiagnosticsParse.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/Effects.h"
#include "swift/AST/ExistentialLayout.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/ImportCache.h"
#include "swift/AST/ModuleNameLookup.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/NameLookupRequests.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/PropertyWrappers.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/StorageImpl.h"
#include "swift/AST/SwiftNameTranslation.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/AST/Types.h"
#include "swift/Basic/Assertions.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/Parser.h"
#include "swift/Sema/IDETypeChecking.h"
#include "clang/Basic/CharInfo.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
using namespace swift;
namespace {
/// This visits each attribute on a decl. The visitor should return true if
/// the attribute is invalid and should be marked as such.
class AttributeChecker : public AttributeVisitor<AttributeChecker> {
ASTContext &Ctx;
Decl *D;
public:
AttributeChecker(Decl *D) : Ctx(D->getASTContext()), D(D) {}
/// This emits a diagnostic with a fixit to remove the attribute.
template<typename ...ArgTypes>
InFlightDiagnostic diagnoseAndRemoveAttr(DeclAttribute *attr,
ArgTypes &&...Args) {
return swift::diagnoseAndRemoveAttr(D, attr,
std::forward<ArgTypes>(Args)...);
}
/// Emits a diagnostic with a fixit to remove the attribute if the attribute
/// is applied to a non-public declaration. Returns true if a diagnostic was
/// emitted.
bool diagnoseAndRemoveAttrIfDeclIsNonPublic(DeclAttribute *attr,
bool isError) {
if (auto *VD = dyn_cast<ValueDecl>(D)) {
auto access =
VD->getFormalAccessScope(/*useDC=*/nullptr,
/*treatUsableFromInlineAsPublic=*/true);
if (!access.isPublic()) {
diagnoseAndRemoveAttr(
attr,
isError ? diag::attr_not_on_decl_with_invalid_access_level
: diag::attr_has_no_effect_on_decl_with_access_level,
attr, access.accessLevelForDiagnostics());
return true;
}
}
return false;
}
/// Emits a diagnostic if there is no availability specified for the given
/// platform, as required by the given attribute. Returns true if a diagnostic
/// was emitted.
bool diagnoseMissingAvailability(DeclAttribute *attr, PlatformKind platform) {
auto IntroVer = D->getIntroducedOSVersion(platform);
if (IntroVer.has_value())
return false;
if (auto *VD = dyn_cast<ValueDecl>(D)) {
diagnose(attr->AtLoc, diag::attr_requires_decl_availability_for_platform,
attr, VD->getName(), prettyPlatformString(platform));
} else {
diagnose(attr->AtLoc, diag::attr_requires_availability_for_platform, attr,
prettyPlatformString(platform));
}
return true;
}
template <typename... ArgTypes>
InFlightDiagnostic diagnose(ArgTypes &&... Args) const {
return Ctx.Diags.diagnose(std::forward<ArgTypes>(Args)...);
}
/// Deleting this ensures that all attributes are covered by the visitor
/// below.
bool visitDeclAttribute(DeclAttribute *A) = delete;
#define IGNORED_ATTR(X) void visit##X##Attr(X##Attr *) {}
IGNORED_ATTR(AlwaysEmitIntoClient)
IGNORED_ATTR(HasInitialValue)
IGNORED_ATTR(ClangImporterSynthesizedType)
IGNORED_ATTR(Convenience)
IGNORED_ATTR(Effects)
IGNORED_ATTR(Exported)
IGNORED_ATTR(ForbidSerializingReference)
IGNORED_ATTR(HasStorage)
IGNORED_ATTR(HasMissingDesignatedInitializers)
IGNORED_ATTR(InheritsConvenienceInitializers)
IGNORED_ATTR(Inline)
IGNORED_ATTR(ObjCBridged)
IGNORED_ATTR(ObjCNonLazyRealization)
IGNORED_ATTR(ObjCRuntimeName)
IGNORED_ATTR(RawDocComment)
IGNORED_ATTR(RequiresStoredPropertyInits)
IGNORED_ATTR(RestatedObjCConformance)
IGNORED_ATTR(Semantics)
IGNORED_ATTR(NoLocks)
IGNORED_ATTR(NoAllocation)
IGNORED_ATTR(NoRuntime)
IGNORED_ATTR(NoExistentials)
IGNORED_ATTR(NoObjCBridging)
IGNORED_ATTR(EmitAssemblyVisionRemarks)
IGNORED_ATTR(ShowInInterface)
IGNORED_ATTR(SILGenName)
IGNORED_ATTR(StaticInitializeObjCMetadata)
IGNORED_ATTR(SynthesizedProtocol)
IGNORED_ATTR(Testable)
IGNORED_ATTR(PrivateImport)
IGNORED_ATTR(DisfavoredOverload)
IGNORED_ATTR(ProjectedValueProperty)
IGNORED_ATTR(ReferenceOwnership)
IGNORED_ATTR(OriginallyDefinedIn)
IGNORED_ATTR(NoDerivative)
IGNORED_ATTR(SpecializeExtension)
IGNORED_ATTR(NonSendable)
IGNORED_ATTR(AtRethrows)
IGNORED_ATTR(AtReasync)
IGNORED_ATTR(ImplicitSelfCapture)
IGNORED_ATTR(InheritActorContext)
IGNORED_ATTR(Preconcurrency)
IGNORED_ATTR(BackDeployed)
IGNORED_ATTR(Documentation)
IGNORED_ATTR(LexicalLifetimes)
IGNORED_ATTR(AllowFeatureSuppression)
IGNORED_ATTR(PreInverseGenerics)
#undef IGNORED_ATTR
void visitAlignmentAttr(AlignmentAttr *attr) {
// Alignment must be a power of two.
auto value = attr->getValue();
if (value == 0 || (value & (value - 1)) != 0)
diagnose(attr->getLocation(), diag::alignment_not_power_of_two);
}
void visitBorrowedAttr(BorrowedAttr *attr) {
// These criteria are the same preconditions laid out by
// AbstractStorageDecl::requiresOpaqueModifyCoroutine().
assert(!D->hasClangNode() && "@_borrowed on imported declaration?");
if (D->getAttrs().hasAttribute<DynamicAttr>()) {
diagnose(attr->getLocation(), diag::borrowed_with_objc_dynamic,
D->getDescriptiveKind())
.fixItRemove(attr->getRange());
D->getAttrs().removeAttribute(attr);
return;
}
auto dc = D->getDeclContext();
auto protoDecl = dyn_cast<ProtocolDecl>(dc);
if (protoDecl && protoDecl->isObjC()) {
diagnose(attr->getLocation(), diag::borrowed_on_objc_protocol_requirement,
D->getDescriptiveKind())
.fixItRemove(attr->getRange());
D->getAttrs().removeAttribute(attr);
return;
}
}
void visitTransparentAttr(TransparentAttr *attr);
void visitMutationAttr(DeclAttribute *attr);
void visitMutatingAttr(MutatingAttr *attr) { visitMutationAttr(attr); }
void visitNonMutatingAttr(NonMutatingAttr *attr) { visitMutationAttr(attr); }
void visitBorrowingAttr(BorrowingAttr *attr) { visitMutationAttr(attr); }
void visitConsumingAttr(ConsumingAttr *attr) { visitMutationAttr(attr); }
void visitLegacyConsumingAttr(LegacyConsumingAttr *attr) {
visitMutationAttr(attr);
}
void visitDynamicAttr(DynamicAttr *attr);
void visitIndirectAttr(IndirectAttr *attr) {
if (auto caseDecl = dyn_cast<EnumElementDecl>(D)) {
// An indirect case should have a payload.
if (!caseDecl->hasAssociatedValues())
diagnose(attr->getLocation(), diag::indirect_case_without_payload,
caseDecl->getBaseIdentifier());
// If the enum is already indirect, its cases don't need to be.
else if (caseDecl->getParentEnum()->getAttrs()
.hasAttribute<IndirectAttr>())
diagnose(attr->getLocation(), diag::indirect_case_in_indirect_enum);
}
}
void visitWarnUnqualifiedAccessAttr(WarnUnqualifiedAccessAttr *attr) {
if (!D->getDeclContext()->isTypeContext()) {
diagnoseAndRemoveAttr(attr, diag::attr_methods_only, attr);
}
}
void visitFinalAttr(FinalAttr *attr);
void visitMoveOnlyAttr(MoveOnlyAttr *attr);
void visitCompileTimeConstAttr(CompileTimeConstAttr *attr) {}
void visitIBActionAttr(IBActionAttr *attr);
void visitIBSegueActionAttr(IBSegueActionAttr *attr);
void visitLazyAttr(LazyAttr *attr);
void visitIBDesignableAttr(IBDesignableAttr *attr);
void visitIBInspectableAttr(IBInspectableAttr *attr);
void visitGKInspectableAttr(GKInspectableAttr *attr);
void visitIBOutletAttr(IBOutletAttr *attr);
void visitLLDBDebuggerFunctionAttr(LLDBDebuggerFunctionAttr *attr);
void visitNSManagedAttr(NSManagedAttr *attr);
void visitOverrideAttr(OverrideAttr *attr);
void visitNonOverrideAttr(NonOverrideAttr *attr);
void visitAccessControlAttr(AccessControlAttr *attr);
void visitSetterAccessAttr(SetterAccessAttr *attr);
void visitSPIAccessControlAttr(SPIAccessControlAttr *attr);
bool visitAbstractAccessControlAttr(AbstractAccessControlAttr *attr);
void visitObjCAttr(ObjCAttr *attr);
void visitNonObjCAttr(NonObjCAttr *attr);
void visitObjCImplementationAttr(ObjCImplementationAttr *attr);
void visitObjCMembersAttr(ObjCMembersAttr *attr);
void visitOptionalAttr(OptionalAttr *attr);
void visitAvailableAttr(AvailableAttr *attr);
void visitCDeclAttr(CDeclAttr *attr);
void visitExposeAttr(ExposeAttr *attr);
void visitExternAttr(ExternAttr *attr);
void visitUsedAttr(UsedAttr *attr);
void visitSectionAttr(SectionAttr *attr);
void visitDynamicCallableAttr(DynamicCallableAttr *attr);
void visitDynamicMemberLookupAttr(DynamicMemberLookupAttr *attr);
void visitNSCopyingAttr(NSCopyingAttr *attr);
void visitRequiredAttr(RequiredAttr *attr);
void visitRethrowsAttr(RethrowsAttr *attr);
void checkApplicationMainAttribute(DeclAttribute *attr,
Identifier Id_ApplicationDelegate,
Identifier Id_Kit,
Identifier Id_ApplicationMain);
void visitNSApplicationMainAttr(NSApplicationMainAttr *attr);
void visitUIApplicationMainAttr(UIApplicationMainAttr *attr);
void visitMainTypeAttr(MainTypeAttr *attr);
void visitUnsafeNoObjCTaggedPointerAttr(UnsafeNoObjCTaggedPointerAttr *attr);
void visitSwiftNativeObjCRuntimeBaseAttr(
SwiftNativeObjCRuntimeBaseAttr *attr);
void checkOperatorAttribute(DeclAttribute *attr);
void visitInfixAttr(InfixAttr *attr) { checkOperatorAttribute(attr); }
void visitPostfixAttr(PostfixAttr *attr) { checkOperatorAttribute(attr); }
void visitPrefixAttr(PrefixAttr *attr) { checkOperatorAttribute(attr); }
void visitSpecializeAttr(SpecializeAttr *attr);
void visitFixedLayoutAttr(FixedLayoutAttr *attr);
void visitUsableFromInlineAttr(UsableFromInlineAttr *attr);
void visitInlinableAttr(InlinableAttr *attr);
void visitOptimizeAttr(OptimizeAttr *attr);
void visitExclusivityAttr(ExclusivityAttr *attr);
void visitDiscardableResultAttr(DiscardableResultAttr *attr);
void visitDynamicReplacementAttr(DynamicReplacementAttr *attr);
void visitTypeEraserAttr(TypeEraserAttr *attr);
void visitStorageRestrictionsAttr(StorageRestrictionsAttr *attr);
void visitImplementsAttr(ImplementsAttr *attr);
void visitNoMetadataAttr(NoMetadataAttr *attr);
void visitFrozenAttr(FrozenAttr *attr);
void visitCustomAttr(CustomAttr *attr);
void visitPropertyWrapperAttr(PropertyWrapperAttr *attr);
void visitResultBuilderAttr(ResultBuilderAttr *attr);
void visitImplementationOnlyAttr(ImplementationOnlyAttr *attr);
void visitSPIOnlyAttr(SPIOnlyAttr *attr);
void visitNonEphemeralAttr(NonEphemeralAttr *attr);
void checkOriginalDefinedInAttrs(ArrayRef<OriginallyDefinedInAttr *> Attrs);
void visitDifferentiableAttr(DifferentiableAttr *attr);
void visitDerivativeAttr(DerivativeAttr *attr);
void visitTransposeAttr(TransposeAttr *attr);
void visitActorAttr(ActorAttr *attr);
void visitDistributedActorAttr(DistributedActorAttr *attr);
void visitGlobalActorAttr(GlobalActorAttr *attr);
void visitAsyncAttr(AsyncAttr *attr);
void visitMarkerAttr(MarkerAttr *attr);
void visitReasyncAttr(ReasyncAttr *attr);
void visitNonisolatedAttr(NonisolatedAttr *attr);
void visitNoImplicitCopyAttr(NoImplicitCopyAttr *attr);
void visitAlwaysEmitConformanceMetadataAttr(AlwaysEmitConformanceMetadataAttr *attr);
void visitExtractConstantsFromMembersAttr(ExtractConstantsFromMembersAttr *attr);
void visitSensitiveAttr(SensitiveAttr *attr);
void visitUnavailableFromAsyncAttr(UnavailableFromAsyncAttr *attr);
void visitUnsafeInheritExecutorAttr(UnsafeInheritExecutorAttr *attr);
bool visitLifetimeAttr(DeclAttribute *attr);
void visitEagerMoveAttr(EagerMoveAttr *attr);
void visitNoEagerMoveAttr(NoEagerMoveAttr *attr);
void visitCompilerInitializedAttr(CompilerInitializedAttr *attr);
void checkAvailableAttrs(ArrayRef<AvailableAttr *> Attrs);
void checkBackDeployedAttrs(ArrayRef<BackDeployedAttr *> Attrs);
void visitKnownToBeLocalAttr(KnownToBeLocalAttr *attr);
void visitSendableAttr(SendableAttr *attr);
void visitMacroRoleAttr(MacroRoleAttr *attr);
void visitRawLayoutAttr(RawLayoutAttr *attr);
void visitNonEscapableAttr(NonEscapableAttr *attr);
void visitUnsafeNonEscapableResultAttr(UnsafeNonEscapableResultAttr *attr);
void visitStaticExclusiveOnlyAttr(StaticExclusiveOnlyAttr *attr);
void visitWeakLinkedAttr(WeakLinkedAttr *attr);
};
} // end anonymous namespace
void AttributeChecker::visitNoImplicitCopyAttr(NoImplicitCopyAttr *attr) {
// Only allow for this attribute to be used when experimental move only is
// enabled.
if (!D->getASTContext().LangOpts.hasFeature(Feature::NoImplicitCopy)) {
auto error =
diag::experimental_moveonly_feature_can_only_be_used_when_enabled;
diagnoseAndRemoveAttr(attr, error);
return;
}
if (auto *funcDecl = dyn_cast<FuncDecl>(D)) {
if (visitLifetimeAttr(attr))
return;
// We only handle non-lvalue arguments today.
if (funcDecl->isMutating()) {
auto error = diag::noimplicitcopy_attr_valid_only_on_local_let_params;
diagnoseAndRemoveAttr(attr, error);
return;
}
return;
}
auto *dc = D->getDeclContext();
// If we have a param decl that is marked as no implicit copy, change our
// default specifier to be owned.
if (auto *paramDecl = dyn_cast<ParamDecl>(D)) {
// We only handle non-lvalue arguments today.
if (paramDecl->getSpecifier() == ParamDecl::Specifier::InOut) {
auto error = diag::noimplicitcopy_attr_valid_only_on_local_let_params;
diagnoseAndRemoveAttr(attr, error);
return;
}
return;
}
auto *vd = dyn_cast<VarDecl>(D);
if (!vd) {
auto error = diag::noimplicitcopy_attr_valid_only_on_local_let_params;
diagnoseAndRemoveAttr(attr, error);
return;
}
// If we have a 'var' instead of a 'let', bail. We only support on local
// lets.
if (!vd->isLet()) {
auto error = diag::noimplicitcopy_attr_valid_only_on_local_let_params;
diagnoseAndRemoveAttr(attr, error);
return;
}
// We only support local lets.
if (!dc->isLocalContext()) {
auto error = diag::noimplicitcopy_attr_valid_only_on_local_let_params;
diagnoseAndRemoveAttr(attr, error);
return;
}
// We do not support static vars either yet.
if (dc->isTypeContext() && vd->isStatic()) {
auto error = diag::noimplicitcopy_attr_valid_only_on_local_let_params;
diagnoseAndRemoveAttr(attr, error);
return;
}
}
void AttributeChecker::visitAlwaysEmitConformanceMetadataAttr(AlwaysEmitConformanceMetadataAttr *attr) {
return;
}
void AttributeChecker::visitExtractConstantsFromMembersAttr(ExtractConstantsFromMembersAttr *attr) {
if (!Ctx.LangOpts.hasFeature(Feature::ExtractConstantsFromMembers)) {
diagnoseAndRemoveAttr(attr,
diag::attr_extractConstantsFromMembers_experimental);
}
}
void AttributeChecker::visitSensitiveAttr(SensitiveAttr *attr) {
if (!Ctx.LangOpts.hasFeature(Feature::Sensitive)) {
diagnoseAndRemoveAttr(attr,
diag::attr_sensitive_experimental);
}
}
void AttributeChecker::visitTransparentAttr(TransparentAttr *attr) {
DeclContext *dc = D->getDeclContext();
// Protocol declarations cannot be transparent.
if (isa<ProtocolDecl>(dc))
diagnoseAndRemoveAttr(attr, diag::transparent_in_protocols_not_supported);
// Class declarations cannot be transparent.
if (isa<ClassDecl>(dc)) {
// @transparent is always ok on implicitly generated accessors: they can
// be dispatched (even in classes) when the references are within the
// class themselves.
if (!(isa<AccessorDecl>(D) && D->isImplicit()))
diagnoseAndRemoveAttr(attr, diag::transparent_in_classes_not_supported);
}
if (auto *VD = dyn_cast<VarDecl>(D)) {
// Stored properties and variables can't be transparent.
if (VD->hasStorage())
diagnoseAndRemoveAttr(attr, diag::attribute_invalid_on_stored_property,
attr);
}
}
void AttributeChecker::visitMutationAttr(DeclAttribute *attr) {
FuncDecl *FD = cast<FuncDecl>(D);
SelfAccessKind attrModifier;
switch (attr->getKind()) {
case DeclAttrKind::LegacyConsuming:
attrModifier = SelfAccessKind::LegacyConsuming;
break;
case DeclAttrKind::Mutating:
attrModifier = SelfAccessKind::Mutating;
break;
case DeclAttrKind::NonMutating:
attrModifier = SelfAccessKind::NonMutating;
break;
case DeclAttrKind::Consuming:
attrModifier = SelfAccessKind::Consuming;
break;
case DeclAttrKind::Borrowing:
attrModifier = SelfAccessKind::Borrowing;
break;
default:
llvm_unreachable("unhandled attribute kind");
}
auto DC = FD->getDeclContext();
// mutation attributes may only appear in type context.
if (auto contextTy = DC->getDeclaredInterfaceType()) {
// 'mutating' and 'nonmutating' are not valid on types
// with reference semantics.
if (contextTy->hasReferenceSemantics()) {
switch (attrModifier) {
case SelfAccessKind::Consuming:
case SelfAccessKind::LegacyConsuming:
case SelfAccessKind::Borrowing:
// It's still OK to specify the ownership convention of methods in
// classes.
break;
case SelfAccessKind::Mutating:
case SelfAccessKind::NonMutating:
diagnoseAndRemoveAttr(attr, diag::mutating_invalid_classes,
attrModifier, FD->getDescriptiveKind(),
DC->getSelfProtocolDecl() != nullptr);
break;
}
}
// Types who are marked @_staticExclusiveOnly cannot have mutating functions.
if (auto SD = contextTy->getStructOrBoundGenericStruct()) {
if (SD->getAttrs().hasAttribute<StaticExclusiveOnlyAttr>() &&
attrModifier == SelfAccessKind::Mutating) {
diagnoseAndRemoveAttr(attr, diag::attr_static_exclusive_only_mutating,
contextTy, FD);
}
}
} else {
diagnoseAndRemoveAttr(attr, diag::mutating_invalid_global_scope,
attrModifier);
}
// Verify we don't have more than one ownership specifier.
if ((FD->getAttrs().hasAttribute<MutatingAttr>() +
FD->getAttrs().hasAttribute<NonMutatingAttr>() +
FD->getAttrs().hasAttribute<LegacyConsumingAttr>() +
FD->getAttrs().hasAttribute<ConsumingAttr>() +
FD->getAttrs().hasAttribute<BorrowingAttr>()) > 1) {
if (auto *NMA = FD->getAttrs().getAttribute<NonMutatingAttr>()) {
if (attrModifier != SelfAccessKind::NonMutating) {
diagnoseAndRemoveAttr(NMA, diag::functions_mutating_and_not,
SelfAccessKind::NonMutating, attrModifier);
}
}
if (auto *MUA = FD->getAttrs().getAttribute<MutatingAttr>()) {
if (attrModifier != SelfAccessKind::Mutating) {
diagnoseAndRemoveAttr(MUA, diag::functions_mutating_and_not,
SelfAccessKind::Mutating, attrModifier);
}
}
if (auto *CSA = FD->getAttrs().getAttribute<LegacyConsumingAttr>()) {
if (attrModifier != SelfAccessKind::LegacyConsuming) {
diagnoseAndRemoveAttr(CSA, diag::functions_mutating_and_not,
SelfAccessKind::LegacyConsuming, attrModifier);
}
}
if (auto *CSA = FD->getAttrs().getAttribute<ConsumingAttr>()) {
if (attrModifier != SelfAccessKind::Consuming) {
diagnoseAndRemoveAttr(CSA, diag::functions_mutating_and_not,
SelfAccessKind::Consuming, attrModifier);
}
}
if (auto *BSA = FD->getAttrs().getAttribute<BorrowingAttr>()) {
if (attrModifier != SelfAccessKind::Borrowing) {
diagnoseAndRemoveAttr(BSA, diag::functions_mutating_and_not,
SelfAccessKind::Borrowing, attrModifier);
}
}
}
// Verify that we don't have a static function.
if (FD->isStatic())
diagnoseAndRemoveAttr(attr, diag::static_functions_not_mutating);
}
void AttributeChecker::visitDynamicAttr(DynamicAttr *attr) {
// Members cannot be both dynamic and @_transparent.
if (D->getAttrs().hasAttribute<TransparentAttr>())
diagnoseAndRemoveAttr(attr, diag::dynamic_with_transparent);
}
/// Replaces asynchronous IBActionAttr/IBSegueActionAttr function declarations
/// with a synchronous function. The body of the original function is moved
/// inside of a task executed on the MainActor
static void emitFixItIBActionRemoveAsync(ASTContext &ctx, const FuncDecl &FD) {
// If we don't have an async loc for some reason, things will explode
if (!FD.getAsyncLoc())
return;
std::string replacement = "";
// attributes, function name and everything up to `async` (exclusive)
replacement +=
CharSourceRange(ctx.SourceMgr, FD.getSourceRangeIncludingAttrs().Start,
FD.getAsyncLoc())
.str();
CharSourceRange returnType = Lexer::getCharSourceRangeFromSourceRange(
ctx.SourceMgr, FD.getResultTypeSourceRange());
// If we have a return type, include that here
if (returnType.isValid()) {
replacement +=
(llvm::Twine("-> ") + Lexer::getCharSourceRangeFromSourceRange(
ctx.SourceMgr, FD.getResultTypeSourceRange())
.str())
.str();
}
if (!FD.hasBody()) {
// If we don't have any body, the sourcelocs won't work and will result in
// crashes, so just swap out what we can
SourceLoc endLoc =
returnType.isValid() ? returnType.getEnd() : FD.getAsyncLoc();
ctx.Diags
.diagnose(FD.getAsyncLoc(), diag::remove_async_add_task, &FD)
.fixItReplace(
SourceRange(FD.getSourceRangeIncludingAttrs().Start, endLoc),
replacement);
return;
}
if (returnType.isValid())
replacement += " "; // insert space between type name and lbrace
replacement += "{\nTask { @MainActor in";
// If the body of the function is just "{}", there isn't anything to wrap.
// stepping over the braces to grab just the body will result in the `Start`
// location of the source range to come after the `End` of the range, and we
// will overflow. Dance around this by just appending the end of the fix to
// the replacement.
if (FD.getBody()->getLBraceLoc() !=
FD.getBody()->getRBraceLoc().getAdvancedLocOrInvalid(-1)) {
// We actually have a body, so add that to the string
CharSourceRange functionBody(
ctx.SourceMgr, FD.getBody()->getLBraceLoc().getAdvancedLocOrInvalid(1),
FD.getBody()->getRBraceLoc().getAdvancedLocOrInvalid(-1));
replacement += functionBody.str();
}
replacement += " }\n}";
ctx.Diags
.diagnose(FD.getAsyncLoc(), diag::remove_async_add_task, &FD)
.fixItReplace(SourceRange(FD.getSourceRangeIncludingAttrs().Start,
FD.getBody()->getRBraceLoc()),
replacement);
}
static bool
validateIBActionSignature(ASTContext &ctx, DeclAttribute *attr,
const FuncDecl *FD, unsigned minParameters,
unsigned maxParameters, bool hasVoidResult = true) {
bool valid = true;
auto arity = FD->getParameters()->size();
auto resultType = FD->getResultInterfaceType();
if (arity < minParameters || arity > maxParameters) {
auto diagID = diag::invalid_ibaction_argument_count;
if (minParameters == maxParameters)
diagID = diag::invalid_ibaction_argument_count_exact;
else if (minParameters == 0)
diagID = diag::invalid_ibaction_argument_count_max;
ctx.Diags.diagnose(FD, diagID, attr->getAttrName(), minParameters,
maxParameters);
valid = false;
}
if (resultType->isVoid() != hasVoidResult) {
ctx.Diags.diagnose(FD, diag::invalid_ibaction_result, attr->getAttrName(),
hasVoidResult);
valid = false;
}
if (FD->isAsyncContext()) {
ctx.Diags.diagnose(FD->getAsyncLoc(), diag::attr_decl_async,
attr->getAttrName(), FD->getDescriptiveKind());
emitFixItIBActionRemoveAsync(ctx, *FD);
valid = false;
}
// We don't need to check here that parameter or return types are
// ObjC-representable; IsObjCRequest will validate that.
if (!valid)
attr->setInvalid();
return valid;
}
static bool isiOS(ASTContext &ctx) {
return ctx.LangOpts.Target.isiOS();
}
static bool iswatchOS(ASTContext &ctx) {
return ctx.LangOpts.Target.isWatchOS();
}
static bool isRelaxedIBAction(ASTContext &ctx) {
if (ctx.LangOpts.Target.isXROS())
return true;
return isiOS(ctx) || iswatchOS(ctx);
}
void AttributeChecker::visitIBActionAttr(IBActionAttr *attr) {
// Only instance methods can be IBActions.
const FuncDecl *FD = cast<FuncDecl>(D);
if (!FD->isPotentialIBActionTarget()) {
diagnoseAndRemoveAttr(attr, diag::invalid_ibaction_decl,
attr->getAttrName());
return;
}
if (isRelaxedIBAction(Ctx))
// iOS, tvOS, and watchOS allow 0-2 parameters to an @IBAction method.
validateIBActionSignature(Ctx, attr, FD, /*minParams=*/0, /*maxParams=*/2);
else
// macOS allows 1 parameter to an @IBAction method.
validateIBActionSignature(Ctx, attr, FD, /*minParams=*/1, /*maxParams=*/1);
}
void AttributeChecker::visitIBSegueActionAttr(IBSegueActionAttr *attr) {
// Only instance methods can be IBActions.
const FuncDecl *FD = cast<FuncDecl>(D);
if (!FD->isPotentialIBActionTarget())
diagnoseAndRemoveAttr(attr, diag::invalid_ibaction_decl,
attr->getAttrName());
if (!validateIBActionSignature(Ctx, attr, FD,
/*minParams=*/1, /*maxParams=*/3,
/*hasVoidResult=*/false))
return;
// If the IBSegueAction method's selector belongs to one of the ObjC method
// families (like -newDocumentSegue: or -copyScreen), it would return the
// object at +1, but the caller would expect it to be +0 and would therefore
// leak it.
//
// To prevent that, diagnose if the selector belongs to one of the method
// families and suggest that the user change the Swift name or Obj-C selector.
auto currentSelector = FD->getObjCSelector();
SmallString<32> prefix("make");
switch (currentSelector.getSelectorFamily()) {
case ObjCSelectorFamily::None:
// No error--exit early.
return;
case ObjCSelectorFamily::Alloc:
case ObjCSelectorFamily::Init:
case ObjCSelectorFamily::New:
// Fix-it will replace the "alloc"/"init"/"new" in the selector with "make".
break;
case ObjCSelectorFamily::Copy:
// Fix-it will replace the "copy" in the selector with "makeCopy".
prefix += "Copy";
break;
case ObjCSelectorFamily::MutableCopy:
// Fix-it will replace the "mutable" in the selector with "makeMutable".
prefix += "Mutable";
break;
}
// Emit the actual error.
diagnose(FD, diag::ibsegueaction_objc_method_family, attr->getAttrName(),
currentSelector);
// The rest of this is just fix-it generation.
/// Replaces the first word of \c oldName with the prefix, where "word" is a
/// sequence of lowercase characters.
auto replacingPrefix = [&](Identifier oldName) -> Identifier {
SmallString<32> scratch = prefix;
scratch += oldName.str().drop_while(clang::isLowercase);
return Ctx.getIdentifier(scratch);
};
// Suggest changing the Swift name of the method, unless there is already an
// explicit selector.
if (!FD->getAttrs().hasAttribute<ObjCAttr>() ||
!FD->getAttrs().getAttribute<ObjCAttr>()->hasName()) {
auto newSwiftBaseName = replacingPrefix(FD->getBaseIdentifier());
auto argumentNames = FD->getName().getArgumentNames();
DeclName newSwiftName(Ctx, newSwiftBaseName, argumentNames);
auto diag = diagnose(FD, diag::fixit_rename_in_swift, newSwiftName);
fixDeclarationName(diag, FD, newSwiftName);
}
// Suggest changing just the selector to one with a different first piece.
auto oldPieces = currentSelector.getSelectorPieces();
SmallVector<Identifier, 4> newPieces(oldPieces.begin(), oldPieces.end());
newPieces[0] = replacingPrefix(newPieces[0]);
ObjCSelector newSelector(Ctx, currentSelector.getNumArgs(), newPieces);
auto diag = diagnose(FD, diag::fixit_rename_in_objc, newSelector);
fixDeclarationObjCName(diag, FD, currentSelector, newSelector);
}
void AttributeChecker::visitIBDesignableAttr(IBDesignableAttr *attr) {
if (auto *ED = dyn_cast<ExtensionDecl>(D)) {
if (auto nominalDecl = ED->getExtendedNominal()) {
if (!isa<ClassDecl>(nominalDecl))
diagnoseAndRemoveAttr(attr, diag::invalid_ibdesignable_extension);
}
}
}
void AttributeChecker::visitIBInspectableAttr(IBInspectableAttr *attr) {
// Only instance properties can be 'IBInspectable'.
auto *VD = cast<VarDecl>(D);
if (!VD->getDeclContext()->getSelfClassDecl() || VD->isStatic())
diagnoseAndRemoveAttr(attr, diag::attr_must_be_used_on_class_instance,
attr->getAttrName());
}
void AttributeChecker::visitGKInspectableAttr(GKInspectableAttr *attr) {
// Only instance properties can be 'GKInspectable'.
auto *VD = cast<VarDecl>(D);
if (!VD->getDeclContext()->getSelfClassDecl() || VD->isStatic())
diagnoseAndRemoveAttr(attr, diag::attr_must_be_used_on_class_instance,
attr->getAttrName());
}
static std::optional<Diag<bool, Type>>
isAcceptableOutletType(Type type, bool &isArray, ASTContext &ctx) {
if (type->isObjCExistentialType() || type->isAny())
return std::nullopt; // @objc existential types are okay
auto nominal = type->getAnyNominal();
if (auto classDecl = dyn_cast_or_null<ClassDecl>(nominal)) {
if (classDecl->isObjC())
return std::nullopt; // @objc class types are okay.
return diag::iboutlet_nonobjc_class;
}
if (type->isString()) {
// String is okay because it is bridged to NSString.
// FIXME: BridgesTypes.def is almost sufficient for this.
return std::nullopt;
}
if (type->isArray()) {
// Arrays of arrays are not allowed.
if (isArray)
return diag::iboutlet_nonobject_type;
isArray = true;
// Handle Array<T>. T must be an Objective-C class or protocol.
auto boundTy = type->castTo<BoundGenericStructType>();
auto boundArgs = boundTy->getGenericArgs();
assert(boundArgs.size() == 1 && "invalid Array declaration");
Type elementTy = boundArgs.front();
return isAcceptableOutletType(elementTy, isArray, ctx);
}
if (type->isExistentialType())
return diag::iboutlet_nonobjc_protocol;
// No other types are permitted.
return diag::iboutlet_nonobject_type;
}
void AttributeChecker::visitIBOutletAttr(IBOutletAttr *attr) {
// Only instance properties can be 'IBOutlet'.
auto *VD = cast<VarDecl>(D);
if (!VD->getDeclContext()->getSelfClassDecl() || VD->isStatic())
diagnoseAndRemoveAttr(attr, diag::attr_must_be_used_on_class_instance,
attr->getAttrName());
if (!VD->isSettable(nullptr)) {
// Allow non-mutable IBOutlet properties in module interfaces,
// as they may have been private(set)
SourceFile *Parent = VD->getDeclContext()->getParentSourceFile();
if (!Parent || Parent->Kind != SourceFileKind::Interface)
diagnoseAndRemoveAttr(attr, diag::iboutlet_only_mutable);
}
// Verify that the field type is valid as an outlet.
auto type = VD->getTypeInContext();
if (VD->isInvalid())
return;
// Look through ownership types, and optionals.
type = type->getReferenceStorageReferent();
bool wasOptional = false;
if (Type underlying = type->getOptionalObjectType()) {
type = underlying;
wasOptional = true;
}
bool isArray = false;
if (auto isError = isAcceptableOutletType(type, isArray, Ctx))
diagnoseAndRemoveAttr(attr, isError.value(),
/*array=*/isArray, type);
// Skip remaining diagnostics if the property has an
// attached wrapper.
if (VD->hasAttachedPropertyWrapper())
return;
// If the type wasn't optional, an array, or unowned, complain.
if (!wasOptional && !isArray) {
diagnose(attr->getLocation(), diag::iboutlet_non_optional, type);
auto typeRange = VD->getTypeSourceRangeForDiagnostics();
{ // Only one diagnostic can be active at a time.
auto diag = diagnose(typeRange.Start, diag::note_make_optional,
OptionalType::get(type));
if (type->hasSimpleTypeRepr()) {
diag.fixItInsertAfter(typeRange.End, "?");
} else {
diag.fixItInsert(typeRange.Start, "(")
.fixItInsertAfter(typeRange.End, ")?");
}
}
{ // Only one diagnostic can be active at a time.
auto diag = diagnose(typeRange.Start,
diag::note_make_implicitly_unwrapped_optional);
if (type->hasSimpleTypeRepr()) {
diag.fixItInsertAfter(typeRange.End, "!");
} else {
diag.fixItInsert(typeRange.Start, "(")
.fixItInsertAfter(typeRange.End, ")!");
}
}
}
}
void AttributeChecker::visitNSManagedAttr(NSManagedAttr *attr) {
// @NSManaged only applies to instance methods and properties within a class.
if (cast<ValueDecl>(D)->isStatic() ||
!D->getDeclContext()->getSelfClassDecl()) {
diagnoseAndRemoveAttr(attr, diag::attr_NSManaged_not_instance_member);
}
if (auto *method = dyn_cast<FuncDecl>(D)) {
// Separate out the checks for methods.
if (method->hasBody())
diagnoseAndRemoveAttr(attr, diag::attr_NSManaged_method_body);
return;
}
// Everything below deals with restrictions on @NSManaged properties.
auto *VD = cast<VarDecl>(D);
// @NSManaged properties cannot be @NSCopying
if (auto *NSCopy = VD->getAttrs().getAttribute<NSCopyingAttr>())
diagnoseAndRemoveAttr(NSCopy, diag::attr_NSManaged_NSCopying);
}
void AttributeChecker::
visitLLDBDebuggerFunctionAttr(LLDBDebuggerFunctionAttr *attr) {
// This is only legal when debugger support is on.
if (!D->getASTContext().LangOpts.DebuggerSupport)
diagnoseAndRemoveAttr(attr, diag::attr_for_debugger_support_only);
}
void AttributeChecker::visitOverrideAttr(OverrideAttr *attr) {
if (!isa<ClassDecl>(D->getDeclContext()) &&
!isa<ProtocolDecl>(D->getDeclContext()) &&
!isa<ExtensionDecl>(D->getDeclContext()))
diagnoseAndRemoveAttr(attr, diag::override_nonclass_decl);
}
void AttributeChecker::visitNonOverrideAttr(NonOverrideAttr *attr) {
if (auto overrideAttr = D->getAttrs().getAttribute<OverrideAttr>())
diagnoseAndRemoveAttr(overrideAttr, diag::nonoverride_and_override_attr);
if (!isa<ClassDecl>(D->getDeclContext()) &&
!isa<ProtocolDecl>(D->getDeclContext()) &&
!isa<ExtensionDecl>(D->getDeclContext())) {
diagnoseAndRemoveAttr(attr, diag::nonoverride_wrong_decl_context);
}
}
void AttributeChecker::visitLazyAttr(LazyAttr *attr) {
// lazy may only be used on properties.
auto *VD = cast<VarDecl>(D);
auto attrs = VD->getAttrs();
// 'lazy' is not allowed to have reference attributes