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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 "TypeCheckType.h"
#include "TypeChecker.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/DiagnosticsParse.h"
#include "swift/AST/GenericEnvironment.h"
#include "swift/AST/GenericSignatureBuilder.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/NameLookupRequests.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/PropertyWrappers.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/AST/Types.h"
#include "swift/Parse/Lexer.h"
#include "swift/Sema/IDETypeChecking.h"
#include "clang/Basic/CharInfo.h"
#include "llvm/Support/Debug.h"
using namespace swift;
namespace {
/// This emits a diagnostic with a fixit to remove the attribute.
template<typename ...ArgTypes>
void diagnoseAndRemoveAttr(TypeChecker &TC, Decl *D, DeclAttribute *attr,
ArgTypes &&...Args) {
assert(!D->hasClangNode() && "Clang importer propagated a bogus attribute");
if (!D->hasClangNode()) {
SourceLoc loc = attr->getLocation();
assert(loc.isValid() && "Diagnosing attribute with invalid location");
if (loc.isInvalid()) {
loc = D->getLoc();
}
if (loc.isValid()) {
TC.diagnose(loc, std::forward<ArgTypes>(Args)...)
.fixItRemove(attr->getRangeWithAt());
}
}
attr->setInvalid();
}
/// This visits each attribute on a decl early, before the majority of type
/// checking has been performed for the decl. The visitor should return true if
/// the attribute is invalid and should be marked as such.
class AttributeEarlyChecker : public AttributeVisitor<AttributeEarlyChecker> {
TypeChecker &TC;
Decl *D;
public:
AttributeEarlyChecker(TypeChecker &TC, Decl *D) : TC(TC), D(D) {}
/// This emits a diagnostic with a fixit to remove the attribute.
template<typename ...ArgTypes>
void diagnoseAndRemoveAttr(DeclAttribute *attr, ArgTypes &&...Args) {
::diagnoseAndRemoveAttr(TC, D, attr, 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(Available)
IGNORED_ATTR(HasInitialValue)
IGNORED_ATTR(CDecl)
IGNORED_ATTR(ClangImporterSynthesizedType)
IGNORED_ATTR(Convenience)
IGNORED_ATTR(DiscardableResult)
IGNORED_ATTR(DynamicCallable)
IGNORED_ATTR(DynamicMemberLookup)
IGNORED_ATTR(Effects)
IGNORED_ATTR(Exported)
IGNORED_ATTR(FixedLayout)
IGNORED_ATTR(ForbidSerializingReference)
IGNORED_ATTR(Frozen)
IGNORED_ATTR(HasStorage)
IGNORED_ATTR(ImplementationOnly)
IGNORED_ATTR(Implements)
IGNORED_ATTR(ImplicitlyUnwrappedOptional)
IGNORED_ATTR(Infix)
IGNORED_ATTR(Inlinable)
IGNORED_ATTR(Inline)
IGNORED_ATTR(NonObjC)
IGNORED_ATTR(NSApplicationMain)
IGNORED_ATTR(NSCopying)
IGNORED_ATTR(ObjC)
IGNORED_ATTR(ObjCBridged)
IGNORED_ATTR(ObjCNonLazyRealization)
IGNORED_ATTR(ObjCRuntimeName)
IGNORED_ATTR(Optimize)
IGNORED_ATTR(Optional)
IGNORED_ATTR(Postfix)
IGNORED_ATTR(Prefix)
IGNORED_ATTR(RawDocComment)
IGNORED_ATTR(Required)
IGNORED_ATTR(RequiresStoredPropertyInits)
IGNORED_ATTR(RestatedObjCConformance)
IGNORED_ATTR(Rethrows)
IGNORED_ATTR(Semantics)
IGNORED_ATTR(ShowInInterface)
IGNORED_ATTR(SILGenName)
IGNORED_ATTR(Specialize)
IGNORED_ATTR(StaticInitializeObjCMetadata)
IGNORED_ATTR(SwiftNativeObjCRuntimeBase)
IGNORED_ATTR(SynthesizedProtocol)
IGNORED_ATTR(Testable)
IGNORED_ATTR(UIApplicationMain)
IGNORED_ATTR(UnsafeNoObjCTaggedPointer)
IGNORED_ATTR(UsableFromInline)
IGNORED_ATTR(WeakLinked)
IGNORED_ATTR(DynamicReplacement)
IGNORED_ATTR(PrivateImport)
IGNORED_ATTR(Custom)
IGNORED_ATTR(PropertyWrapper)
IGNORED_ATTR(DisfavoredOverload)
IGNORED_ATTR(FunctionBuilder)
IGNORED_ATTR(ProjectedValueProperty)
// SWIFT_ENABLE_TENSORFLOW
IGNORED_ATTR(Differentiable)
IGNORED_ATTR(Differentiating)
IGNORED_ATTR(CompilerEvaluable)
IGNORED_ATTR(NoDerivative)
IGNORED_ATTR(Transposing)
#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)
TC.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>()) {
TC.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()) {
TC.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 visitConsumingAttr(ConsumingAttr *attr) { visitMutationAttr(attr); }
void visitDynamicAttr(DynamicAttr *attr);
void visitReferenceOwnershipAttr(ReferenceOwnershipAttr *attr) {
TC.checkReferenceOwnershipAttr(cast<VarDecl>(D), attr);
}
void visitFinalAttr(FinalAttr *attr) {
// Reject combining 'final' with 'open'.
if (auto accessAttr = D->getAttrs().getAttribute<AccessControlAttr>()) {
if (accessAttr->getAccess() == AccessLevel::Open) {
TC.diagnose(attr->getLocation(), diag::open_decl_cannot_be_final,
D->getDescriptiveKind());
return;
}
}
if (isa<ClassDecl>(D))
return;
// 'final' only makes sense in the context of a class declaration.
// Reject it on global functions, protocols, structs, enums, etc.
if (!D->getDeclContext()->getSelfClassDecl()) {
TC.diagnose(attr->getLocation(), diag::member_cannot_be_final)
.fixItRemove(attr->getRange());
// Remove the attribute so child declarations are not flagged as final
// and duplicate the error message.
D->getAttrs().removeAttribute(attr);
return;
}
}
void visitIndirectAttr(IndirectAttr *attr) {
if (auto caseDecl = dyn_cast<EnumElementDecl>(D)) {
// An indirect case should have a payload.
if (!caseDecl->hasAssociatedValues())
TC.diagnose(attr->getLocation(),
diag::indirect_case_without_payload, caseDecl->getName());
// If the enum is already indirect, its cases don't need to be.
else if (caseDecl->getParentEnum()->getAttrs()
.hasAttribute<IndirectAttr>())
TC.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 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);
bool visitAbstractAccessControlAttr(AbstractAccessControlAttr *attr);
void visitObjCMembersAttr(ObjCMembersAttr *attr);
};
} // end anonymous namespace
void AttributeEarlyChecker::visitTransparentAttr(TransparentAttr *attr) {
DeclContext *Ctx = D->getDeclContext();
// Protocol declarations cannot be transparent.
if (isa<ProtocolDecl>(Ctx))
diagnoseAndRemoveAttr(attr, diag::transparent_in_protocols_not_supported);
// Class declarations cannot be transparent.
if (isa<ClassDecl>(Ctx)) {
// @transparent is always ok on implicitly generated accessors: they can
// be dispatched (even in classes) when the references are within the
// class themself.
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 AttributeEarlyChecker::visitMutationAttr(DeclAttribute *attr) {
FuncDecl *FD = cast<FuncDecl>(D);
SelfAccessKind attrModifier;
switch (attr->getKind()) {
case DeclAttrKind::DAK_Consuming:
attrModifier = SelfAccessKind::__Consuming;
break;
case DeclAttrKind::DAK_Mutating:
attrModifier = SelfAccessKind::Mutating;
break;
case DeclAttrKind::DAK_NonMutating:
attrModifier = SelfAccessKind::NonMutating;
break;
default:
llvm_unreachable("unhandled attribute kind");
}
// mutation attributes may only appear in type context.
if (auto contextTy = FD->getDeclContext()->getDeclaredInterfaceType()) {
// 'mutating' and 'nonmutating' are not valid on types
// with reference semantics.
if (contextTy->hasReferenceSemantics()) {
if (attrModifier != SelfAccessKind::__Consuming)
diagnoseAndRemoveAttr(attr, diag::mutating_invalid_classes,
attrModifier);
}
} else {
diagnoseAndRemoveAttr(attr, diag::mutating_invalid_global_scope,
attrModifier);
}
// Verify we don't have more than one of mutating, nonmutating,
// and __consuming.
if ((FD->getAttrs().hasAttribute<MutatingAttr>() +
FD->getAttrs().hasAttribute<NonMutatingAttr>() +
FD->getAttrs().hasAttribute<ConsumingAttr>()) > 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<ConsumingAttr>()) {
if (attrModifier != SelfAccessKind::__Consuming) {
diagnoseAndRemoveAttr(CSA, diag::functions_mutating_and_not,
SelfAccessKind::__Consuming, attrModifier);
}
}
}
// Verify that we don't have a static function.
if (FD->isStatic())
diagnoseAndRemoveAttr(attr, diag::static_functions_not_mutating);
}
void AttributeEarlyChecker::visitDynamicAttr(DynamicAttr *attr) {
// Members cannot be both dynamic and @_transparent.
if (D->getAttrs().hasAttribute<TransparentAttr>())
diagnoseAndRemoveAttr(attr, diag::dynamic_with_transparent);
if (!D->getAttrs().hasAttribute<ObjCAttr>() &&
D->getModuleContext()->isResilient())
diagnoseAndRemoveAttr(attr,
diag::dynamic_and_library_evolution_not_supported);
}
void AttributeEarlyChecker::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());
}
void AttributeEarlyChecker::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());
}
void AttributeEarlyChecker::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 AttributeEarlyChecker::visitIBInspectableAttr(IBInspectableAttr *attr) {
// Only instance properties can be 'IBInspectable'.
auto *VD = cast<VarDecl>(D);
if (!VD->getDeclContext()->getSelfClassDecl() || VD->isStatic())
diagnoseAndRemoveAttr(attr, diag::invalid_ibinspectable,
attr->getAttrName());
}
void AttributeEarlyChecker::visitGKInspectableAttr(GKInspectableAttr *attr) {
// Only instance properties can be 'GKInspectable'.
auto *VD = cast<VarDecl>(D);
if (!VD->getDeclContext()->getSelfClassDecl() || VD->isStatic())
diagnoseAndRemoveAttr(attr, diag::invalid_ibinspectable,
attr->getAttrName());
}
static Optional<Diag<bool,Type>>
isAcceptableOutletType(Type type, bool &isArray, TypeChecker &TC) {
if (type->isObjCExistentialType() || type->isAny())
return None; // @objc existential types are okay
auto nominal = type->getAnyNominal();
if (auto classDecl = dyn_cast_or_null<ClassDecl>(nominal)) {
if (classDecl->isObjC())
return None; // @objc class types are okay.
return diag::iboutlet_nonobjc_class;
}
if (nominal == TC.Context.getStringDecl()) {
// String is okay because it is bridged to NSString.
// FIXME: BridgesTypes.def is almost sufficient for this.
return None;
}
if (nominal == TC.Context.getArrayDecl()) {
// 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, TC);
}
if (type->isExistentialType())
return diag::iboutlet_nonobjc_protocol;
// No other types are permitted.
return diag::iboutlet_nonobject_type;
}
void AttributeEarlyChecker::visitIBOutletAttr(IBOutletAttr *attr) {
// Only instance properties can be 'IBOutlet'.
auto *VD = cast<VarDecl>(D);
if (!VD->getDeclContext()->getSelfClassDecl() || VD->isStatic())
diagnoseAndRemoveAttr(attr, diag::invalid_iboutlet);
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->getType();
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, TC))
diagnoseAndRemoveAttr(attr, isError.getValue(),
/*array=*/isArray, type);
// If the type wasn't optional, an array, or unowned, complain.
if (!wasOptional && !isArray) {
TC.diagnose(attr->getLocation(), diag::iboutlet_non_optional, type);
auto typeRange = VD->getTypeSourceRangeForDiagnostics();
{ // Only one diagnostic can be active at a time.
auto diag = TC.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 = TC.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 AttributeEarlyChecker::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 AttributeEarlyChecker::
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 AttributeEarlyChecker::visitOverrideAttr(OverrideAttr *attr) {
if (!isa<ClassDecl>(D->getDeclContext()) &&
!isa<ProtocolDecl>(D->getDeclContext()) &&
!isa<ExtensionDecl>(D->getDeclContext()))
diagnoseAndRemoveAttr(attr, diag::override_nonclass_decl);
}
void AttributeEarlyChecker::visitNonOverrideAttr(NonOverrideAttr *attr) {
if (!isa<ClassDecl>(D->getDeclContext()) &&
!isa<ProtocolDecl>(D->getDeclContext()) &&
!isa<ExtensionDecl>(D->getDeclContext()))
diagnoseAndRemoveAttr(attr, diag::nonoverride_wrong_decl_context);
}
void AttributeEarlyChecker::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
if (auto *refAttr = attrs.getAttribute<ReferenceOwnershipAttr>())
diagnoseAndRemoveAttr(attr, diag::lazy_not_strong, refAttr->get());
auto varDC = VD->getDeclContext();
// 'lazy' is not allowed on a global variable or on a static property (which
// are already lazily initialized).
// TODO: we can't currently support lazy properties on non-type-contexts.
if (VD->isStatic() ||
(varDC->isModuleScopeContext() &&
!varDC->getParentSourceFile()->isScriptMode())) {
diagnoseAndRemoveAttr(attr, diag::lazy_on_already_lazy_global);
} else if (!VD->getDeclContext()->isTypeContext()) {
diagnoseAndRemoveAttr(attr, diag::lazy_must_be_property);
}
}
bool AttributeEarlyChecker::visitAbstractAccessControlAttr(
AbstractAccessControlAttr *attr) {
// Access control attr may only be used on value decls and extensions.
if (!isa<ValueDecl>(D) && !isa<ExtensionDecl>(D)) {
diagnoseAndRemoveAttr(attr, diag::invalid_decl_modifier, attr);
return true;
}
if (auto extension = dyn_cast<ExtensionDecl>(D)) {
if (!extension->getInherited().empty()) {
diagnoseAndRemoveAttr(attr, diag::extension_access_with_conformances,
attr);
return true;
}
}
// And not on certain value decls.
if (isa<DestructorDecl>(D) || isa<EnumElementDecl>(D)) {
diagnoseAndRemoveAttr(attr, diag::invalid_decl_modifier, attr);
return true;
}
// Or within protocols.
if (isa<ProtocolDecl>(D->getDeclContext())) {
diagnoseAndRemoveAttr(attr, diag::access_control_in_protocol, attr);
TC.diagnose(attr->getLocation(), diag::access_control_in_protocol_detail);
return true;
}
return false;
}
void AttributeEarlyChecker::visitAccessControlAttr(AccessControlAttr *attr) {
visitAbstractAccessControlAttr(attr);
}
void AttributeEarlyChecker::visitSetterAccessAttr(
SetterAccessAttr *attr) {
auto storage = dyn_cast<AbstractStorageDecl>(D);
if (!storage)
diagnoseAndRemoveAttr(attr, diag::access_control_setter, attr->getAccess());
if (visitAbstractAccessControlAttr(attr))
return;
if (!storage->isSettable(storage->getDeclContext())) {
// This must stay in sync with diag::access_control_setter_read_only.
enum {
SK_Constant = 0,
SK_Variable,
SK_Property,
SK_Subscript
} storageKind;
if (isa<SubscriptDecl>(storage))
storageKind = SK_Subscript;
else if (storage->getDeclContext()->isTypeContext())
storageKind = SK_Property;
else if (cast<VarDecl>(storage)->isLet())
storageKind = SK_Constant;
else
storageKind = SK_Variable;
diagnoseAndRemoveAttr(attr, diag::access_control_setter_read_only,
attr->getAccess(), storageKind);
}
}
void AttributeEarlyChecker::visitObjCMembersAttr(ObjCMembersAttr *attr) {
if (!isa<ClassDecl>(D))
diagnoseAndRemoveAttr(attr, diag::objcmembers_attribute_nonclass);
}
void TypeChecker::checkDeclAttributesEarly(Decl *D) {
// Don't perform early attribute validation more than once.
// FIXME: Crummy way to get idempotency.
if (D->didEarlyAttrValidation())
return;
D->setEarlyAttrValidation();
AttributeEarlyChecker Checker(*this, D);
for (auto attr : D->getAttrs()) {
if (!attr->isValid()) continue;
// If Attr.def says that the attribute cannot appear on this kind of
// declaration, diagnose it and disable it.
if (attr->canAppearOnDecl(D)) {
// Otherwise, check it.
Checker.visit(attr);
continue;
}
// Otherwise, this attribute cannot be applied to this declaration. If the
// attribute is only valid on one kind of declaration (which is pretty
// common) give a specific helpful error.
auto PossibleDeclKinds = attr->getOptions() & DeclAttribute::OnAnyDecl;
StringRef OnlyKind;
switch (PossibleDeclKinds) {
case DeclAttribute::OnAccessor: OnlyKind = "accessor"; break;
case DeclAttribute::OnClass: OnlyKind = "class"; break;
case DeclAttribute::OnConstructor: OnlyKind = "init"; break;
case DeclAttribute::OnDestructor: OnlyKind = "deinit"; break;
case DeclAttribute::OnEnum: OnlyKind = "enum"; break;
case DeclAttribute::OnEnumCase: OnlyKind = "case"; break;
case DeclAttribute::OnFunc | DeclAttribute::OnAccessor: // FIXME
case DeclAttribute::OnFunc: OnlyKind = "func"; break;
case DeclAttribute::OnImport: OnlyKind = "import"; break;
case DeclAttribute::OnModule: OnlyKind = "module"; break;
case DeclAttribute::OnParam: OnlyKind = "parameter"; break;
case DeclAttribute::OnProtocol: OnlyKind = "protocol"; break;
case DeclAttribute::OnStruct: OnlyKind = "struct"; break;
case DeclAttribute::OnSubscript: OnlyKind = "subscript"; break;
case DeclAttribute::OnTypeAlias: OnlyKind = "typealias"; break;
case DeclAttribute::OnVar: OnlyKind = "var"; break;
default: break;
}
if (!OnlyKind.empty())
Checker.diagnoseAndRemoveAttr(attr, diag::attr_only_one_decl_kind,
attr, OnlyKind);
else if (attr->isDeclModifier())
Checker.diagnoseAndRemoveAttr(attr, diag::invalid_decl_modifier, attr);
else
Checker.diagnoseAndRemoveAttr(attr, diag::invalid_decl_attribute, attr);
}
}
namespace {
class AttributeChecker : public AttributeVisitor<AttributeChecker> {
TypeChecker &TC;
Decl *D;
/// This emits a diagnostic with a fixit to remove the attribute.
template<typename ...ArgTypes>
void diagnoseAndRemoveAttr(DeclAttribute *attr, ArgTypes &&...Args) {
::diagnoseAndRemoveAttr(TC, D, attr, std::forward<ArgTypes>(Args)...);
}
public:
AttributeChecker(TypeChecker &TC, Decl *D) : TC(TC), D(D) {}
/// Deleting this ensures that all attributes are covered by the visitor
/// below.
void visitDeclAttribute(DeclAttribute *A) = delete;
#define IGNORED_ATTR(CLASS) \
void visit##CLASS##Attr(CLASS##Attr *) {}
IGNORED_ATTR(Alignment)
IGNORED_ATTR(AlwaysEmitIntoClient)
IGNORED_ATTR(Borrowed)
IGNORED_ATTR(HasInitialValue)
IGNORED_ATTR(ClangImporterSynthesizedType)
IGNORED_ATTR(Consuming)
IGNORED_ATTR(Convenience)
IGNORED_ATTR(Dynamic)
IGNORED_ATTR(DynamicReplacement)
IGNORED_ATTR(Effects)
IGNORED_ATTR(Exported)
IGNORED_ATTR(ForbidSerializingReference)
IGNORED_ATTR(GKInspectable)
IGNORED_ATTR(HasStorage)
IGNORED_ATTR(IBDesignable)
IGNORED_ATTR(IBInspectable)
IGNORED_ATTR(IBOutlet) // checked early.
IGNORED_ATTR(ImplicitlyUnwrappedOptional)
IGNORED_ATTR(Indirect)
IGNORED_ATTR(Inline)
IGNORED_ATTR(Lazy) // checked early.
IGNORED_ATTR(LLDBDebuggerFunction)
IGNORED_ATTR(Mutating)
IGNORED_ATTR(NonMutating)
IGNORED_ATTR(NonObjC)
IGNORED_ATTR(NSManaged) // checked early.
IGNORED_ATTR(ObjC)
IGNORED_ATTR(ObjCBridged)
IGNORED_ATTR(ObjCMembers)
IGNORED_ATTR(ObjCNonLazyRealization)
IGNORED_ATTR(ObjCRuntimeName)
IGNORED_ATTR(Optional)
IGNORED_ATTR(Override)
IGNORED_ATTR(PrivateImport)
IGNORED_ATTR(RawDocComment)
IGNORED_ATTR(ReferenceOwnership)
IGNORED_ATTR(RequiresStoredPropertyInits)
IGNORED_ATTR(RestatedObjCConformance)
IGNORED_ATTR(Semantics)
IGNORED_ATTR(ShowInInterface)
IGNORED_ATTR(SILGenName)
IGNORED_ATTR(StaticInitializeObjCMetadata)
IGNORED_ATTR(SynthesizedProtocol)
IGNORED_ATTR(Testable)
IGNORED_ATTR(Transparent)
IGNORED_ATTR(WarnUnqualifiedAccess)
IGNORED_ATTR(WeakLinked)
IGNORED_ATTR(DisfavoredOverload)
IGNORED_ATTR(ProjectedValueProperty)
#undef IGNORED_ATTR
void visitAvailableAttr(AvailableAttr *attr);
void visitCDeclAttr(CDeclAttr *attr);
void visitDynamicCallableAttr(DynamicCallableAttr *attr);
void visitDynamicMemberLookupAttr(DynamicMemberLookupAttr *attr);
void visitFinalAttr(FinalAttr *attr);
void visitIBActionAttr(IBActionAttr *attr);
void visitIBSegueActionAttr(IBSegueActionAttr *attr);
void visitNSCopyingAttr(NSCopyingAttr *attr);
void visitRequiredAttr(RequiredAttr *attr);
void visitRethrowsAttr(RethrowsAttr *attr);
void visitAccessControlAttr(AccessControlAttr *attr);
void visitSetterAccessAttr(SetterAccessAttr *attr);
void checkApplicationMainAttribute(DeclAttribute *attr,
Identifier Id_ApplicationDelegate,
Identifier Id_Kit,
Identifier Id_ApplicationMain);
void visitNSApplicationMainAttr(NSApplicationMainAttr *attr);
void visitUIApplicationMainAttr(UIApplicationMainAttr *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 visitDiscardableResultAttr(DiscardableResultAttr *attr);
void visitImplementsAttr(ImplementsAttr *attr);
void visitFrozenAttr(FrozenAttr *attr);
void visitNonOverrideAttr(NonOverrideAttr *attr);
void visitCustomAttr(CustomAttr *attr);
void visitPropertyWrapperAttr(PropertyWrapperAttr *attr);
void visitFunctionBuilderAttr(FunctionBuilderAttr *attr);
// SWIFT_ENABLE_TENSORFLOW
void visitDifferentiableAttr(DifferentiableAttr *attr);
void visitDifferentiatingAttr(DifferentiatingAttr *attr);
void visitCompilerEvaluableAttr(CompilerEvaluableAttr *attr);
void visitNoDerivativeAttr(NoDerivativeAttr *attr);
void visitTransposingAttr(TransposingAttr *attr);
void visitImplementationOnlyAttr(ImplementationOnlyAttr *attr);
};
} // end anonymous namespace
static bool isiOS(TypeChecker &TC) {
return TC.getLangOpts().Target.isiOS();
}
static bool iswatchOS(TypeChecker &TC) {
return TC.getLangOpts().Target.isWatchOS();
}
static bool isRelaxedIBAction(TypeChecker &TC) {
return isiOS(TC) || iswatchOS(TC);
}
/// Returns true if the given method is an valid implementation of a
/// @dynamicCallable attribute requirement. The method is given to be defined
/// as one of the following: `dynamicallyCall(withArguments:)` or
/// `dynamicallyCall(withKeywordArguments:)`.
bool swift::isValidDynamicCallableMethod(FuncDecl *decl, DeclContext *DC,
TypeChecker &TC,
bool hasKeywordArguments) {
// There are two cases to check.
// 1. `dynamicallyCall(withArguments:)`.
// In this case, the method is valid if the argument has type `A` where
// `A` conforms to `ExpressibleByArrayLiteral`.
// `A.ArrayLiteralElement` and the return type can be arbitrary.
// 2. `dynamicallyCall(withKeywordArguments:)`
// In this case, the method is valid if the argument has type `D` where
// `D` conforms to `ExpressibleByDictionaryLiteral` and `D.Key` conforms to
// `ExpressibleByStringLiteral`.
// `D.Value` and the return type can be arbitrary.
TC.validateDeclForNameLookup(decl);
auto paramList = decl->getParameters();
if (paramList->size() != 1 || paramList->get(0)->isVariadic()) return false;
auto argType = paramList->get(0)->getType();
// If non-keyword (positional) arguments, check that argument type conforms to
// `ExpressibleByArrayLiteral`.
if (!hasKeywordArguments) {
auto arrayLitProto =
TC.Context.getProtocol(KnownProtocolKind::ExpressibleByArrayLiteral);
return TypeChecker::conformsToProtocol(argType, arrayLitProto, DC,
ConformanceCheckOptions()).hasValue();
}
// If keyword arguments, check that argument type conforms to
// `ExpressibleByDictionaryLiteral` and that the `Key` associated type
// conforms to `ExpressibleByStringLiteral`.
auto stringLitProtocol =
TC.Context.getProtocol(KnownProtocolKind::ExpressibleByStringLiteral);
auto dictLitProto =
TC.Context.getProtocol(KnownProtocolKind::ExpressibleByDictionaryLiteral);
auto dictConf = TypeChecker::conformsToProtocol(argType, dictLitProto, DC,
ConformanceCheckOptions());
if (!dictConf) return false;
auto lookup = dictLitProto->lookupDirect(TC.Context.Id_Key);
auto keyAssocType =
cast<AssociatedTypeDecl>(lookup[0])->getDeclaredInterfaceType();
auto keyType = dictConf.getValue().getAssociatedType(argType, keyAssocType);
return TypeChecker::conformsToProtocol(keyType, stringLitProtocol, DC,
ConformanceCheckOptions()).hasValue();
}
/// Returns true if the given nominal type has a valid implementation of a
/// @dynamicCallable attribute requirement with the given argument name.
static bool hasValidDynamicCallableMethod(TypeChecker &TC,
NominalTypeDecl *decl,
Identifier argumentName,
bool hasKeywordArgs) {
auto declType = decl->getDeclaredType();
auto methodName = DeclName(TC.Context,
DeclBaseName(TC.Context.Id_dynamicallyCall),
{ argumentName });
auto candidates = TC.lookupMember(decl, declType, methodName);
if (candidates.empty()) return false;
// Filter valid candidates.
candidates.filter([&](LookupResultEntry entry, bool isOuter) {
auto candidate = cast<FuncDecl>(entry.getValueDecl());
return isValidDynamicCallableMethod(candidate, decl, TC, hasKeywordArgs);
});
// If there are no valid candidates, return false.
if (candidates.size() == 0) return false;
return true;
}
void AttributeChecker::
visitDynamicCallableAttr(DynamicCallableAttr *attr) {
// This attribute is only allowed on nominal types.
auto decl = cast<NominalTypeDecl>(D);
auto type = decl->getDeclaredType();
bool hasValidMethod = false;
hasValidMethod |=
hasValidDynamicCallableMethod(TC, decl, TC.Context.Id_withArguments,
/*hasKeywordArgs*/ false);
hasValidMethod |=
hasValidDynamicCallableMethod(TC, decl, TC.Context.Id_withKeywordArguments,
/*hasKeywordArgs*/ true);
if (!hasValidMethod) {
TC.diagnose(attr->getLocation(), diag::invalid_dynamic_callable_type, type);
attr->setInvalid();
}
}
static bool hasSingleNonVariadicParam(SubscriptDecl *decl,
Identifier expectedLabel) {
auto *indices = decl->getIndices();
if (decl->isInvalid() || indices->size() != 1)
return false;
auto *index = indices->get(0);
if (index->isVariadic() || !index->hasValidSignature())
return false;
return index->getArgumentName() == expectedLabel;
}
/// Returns true if the given subscript method is an valid implementation of
/// the `subscript(dynamicMember:)` requirement for @dynamicMemberLookup.
/// The method is given to be defined as `subscript(dynamicMember:)`.
bool swift::isValidDynamicMemberLookupSubscript(SubscriptDecl *decl,
DeclContext *DC,
TypeChecker &TC) {
// It could be
// - `subscript(dynamicMember: {Writable}KeyPath<...>)`; or
// - `subscript(dynamicMember: String*)`
return isValidKeyPathDynamicMemberLookup(decl, TC) ||
isValidStringDynamicMemberLookup(decl, DC, TC);
}
bool swift::isValidStringDynamicMemberLookup(SubscriptDecl *decl,
DeclContext *DC,
TypeChecker &TC) {
// There are two requirements:
// - The subscript method has exactly one, non-variadic parameter.
// - The parameter type conforms to `ExpressibleByStringLiteral`.
if (!hasSingleNonVariadicParam(decl, TC.Context.Id_dynamicMember))
return false;
const auto *param = decl->getIndices()->get(0);
auto paramType = param->getType();
auto stringLitProto =
TC.Context.getProtocol(KnownProtocolKind::ExpressibleByStringLiteral);
// If this is `subscript(dynamicMember: String*)`
return bool(TypeChecker::conformsToProtocol(paramType, stringLitProto, DC,
ConformanceCheckOptions()));
}
bool swift::isValidKeyPathDynamicMemberLookup(SubscriptDecl *decl,
TypeChecker &TC) {
if (!hasSingleNonVariadicParam(decl, TC.Context.Id_dynamicMember))
return false;
const auto *param = decl->getIndices()->get(0);
if (auto NTD = param->getType()->getAnyNominal()) {
return NTD == TC.Context.getKeyPathDecl() ||
NTD == TC.Context.getWritableKeyPathDecl() ||
NTD == TC.Context.getReferenceWritableKeyPathDecl();
}
return false;
}
Optional<std::pair<Type, Type>>
swift::getRootAndResultTypeOfKeypathDynamicMember(SubscriptDecl *subscript,
const DeclContext *DC) {
auto &TC = TypeChecker::createForContext(DC->getASTContext());
if (!isValidKeyPathDynamicMemberLookup(subscript, TC))
return None;
const auto *param = subscript->getIndices()->get(0);
auto keyPathType = param->getType()->getAs<BoundGenericType>();
if (!keyPathType)
return None;
auto genericArgs = keyPathType->getGenericArgs();
assert(!genericArgs.empty() && genericArgs.size() == 2 &&