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TypeCheckAccess.cpp
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//===--- TypeCheckAccess.cpp - Type Checking for Access Control -----------===//
//
// 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 access control checking.
//
//===----------------------------------------------------------------------===//
#include "TypeCheckAccess.h"
#include "TypeChecker.h"
#include "TypeCheckAvailability.h"
#include "TypeAccessScopeChecker.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/ClangModuleLoader.h"
#include "swift/AST/DiagnosticsSema.h"
#include "swift/AST/ExistentialLayout.h"
#include "swift/AST/Import.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/TypeCheckRequests.h"
#include "swift/Basic/Assertions.h"
#include "clang/AST/DeclObjC.h"
using namespace swift;
#define DEBUG_TYPE "TypeCheckAccess"
namespace {
/// Calls \p callback for each type in each requirement provided by
/// \p source.
static void forAllRequirementTypes(
WhereClauseOwner &&source,
llvm::function_ref<void(Type, TypeRepr *)> callback) {
std::move(source).visitRequirements(TypeResolutionStage::Interface,
[&](const Requirement &req, RequirementRepr *reqRepr) {
switch (req.getKind()) {
case RequirementKind::SameShape:
case RequirementKind::Conformance:
case RequirementKind::SameType:
case RequirementKind::Superclass:
callback(req.getFirstType(),
RequirementRepr::getFirstTypeRepr(reqRepr));
callback(req.getSecondType(),
RequirementRepr::getSecondTypeRepr(reqRepr));
break;
case RequirementKind::Layout:
callback(req.getFirstType(),
RequirementRepr::getFirstTypeRepr(reqRepr));
break;
}
return false;
});
}
/// \see checkTypeAccess
using CheckTypeAccessCallback =
void(AccessScope, const TypeRepr *, DowngradeToWarning, ImportAccessLevel);
class AccessControlCheckerBase {
protected:
bool checkUsableFromInline;
void checkTypeAccessImpl(
Type type, TypeRepr *typeRepr, AccessScope contextAccessScope,
const DeclContext *useDC, bool mayBeInferred,
llvm::function_ref<CheckTypeAccessCallback> diagnose);
void checkTypeAccess(
Type type, TypeRepr *typeRepr, const ValueDecl *context,
bool mayBeInferred,
llvm::function_ref<CheckTypeAccessCallback> diagnose);
void checkTypeAccess(
const TypeLoc &TL, const ValueDecl *context, bool mayBeInferred,
llvm::function_ref<CheckTypeAccessCallback> diagnose) {
return checkTypeAccess(TL.getType(), TL.getTypeRepr(), context,
mayBeInferred, diagnose);
}
void checkRequirementAccess(
WhereClauseOwner &&source,
AccessScope accessScope,
const DeclContext *useDC,
llvm::function_ref<CheckTypeAccessCallback> diagnose) {
forAllRequirementTypes(std::move(source), [&](Type type, TypeRepr *typeRepr) {
checkTypeAccessImpl(type, typeRepr, accessScope, useDC,
/*mayBeInferred*/false, diagnose);
});
}
AccessControlCheckerBase(bool checkUsableFromInline)
: checkUsableFromInline(checkUsableFromInline) {}
public:
void checkGenericParamAccess(
const GenericContext *ownerCtx,
const Decl *ownerDecl,
AccessScope accessScope,
AccessLevel contextAccess);
void checkGenericParamAccess(
const GenericContext *ownerCtx,
const ValueDecl *ownerDecl);
void checkGlobalActorAccess(const Decl *D);
};
} // end anonymous namespace
/// Searches the given type representation for a `DeclRefTypeRepr` that is
/// bound to a type declaration with the given access scope. The type
/// representation is searched in source order. For example, nodes in
/// `A<T>.B<U>` will be checked in the following order: `ATBU`.
static const DeclRefTypeRepr *
findTypeDeclWithAccessScope(TypeRepr *TR, AccessScope accessScope,
const DeclContext *useDC,
bool treatUsableFromInlineAsPublic) {
if (!TR) {
return nullptr;
}
class Finder : public ASTWalker {
AccessScope accessScope;
const DeclContext *useDC;
bool treatUsableFromInlineAsPublic;
const DeclRefTypeRepr *theFind;
public:
explicit Finder(AccessScope accessScope, const DeclContext *useDC,
bool treatUsableFromInlineAsPublic)
: accessScope(accessScope), useDC(useDC),
treatUsableFromInlineAsPublic(treatUsableFromInlineAsPublic),
theFind(nullptr) {}
const DeclRefTypeRepr *getFind() const { return theFind; }
MacroWalking getMacroWalkingBehavior() const override {
return MacroWalking::ArgumentsAndExpansion;
}
QualifiedIdentTypeReprWalkingScheme
getQualifiedIdentTypeReprWalkingScheme() const override {
return QualifiedIdentTypeReprWalkingScheme::SourceOrderRecursive;
}
PreWalkAction walkToTypeReprPre(TypeRepr *TR) override {
auto *declRefTR = dyn_cast<DeclRefTypeRepr>(TR);
if (!declRefTR)
return Action::Continue();
const ValueDecl *VD = declRefTR->getBoundDecl();
if (!VD)
return Action::Continue();
if (VD->getFormalAccessScope(useDC, treatUsableFromInlineAsPublic) !=
accessScope)
return Action::Continue();
theFind = declRefTR;
return Action::Stop();
}
} walker(accessScope, useDC, treatUsableFromInlineAsPublic);
TR->walk(walker);
return walker.getFind();
}
/// Checks if the access scope of the type described by \p TL contains
/// \p contextAccessScope. If it isn't, calls \p diagnose with a TypeRepr
/// representing the offending part of \p TL.
///
/// The TypeRepr passed to \p diagnose may be null, in which case a particular
/// part of the type that caused the problem could not be found. The DeclContext
/// is never null.
///
/// If \p type might be partially inferred even when \p typeRepr is present
/// (such as for properties), pass \c true for \p mayBeInferred. (This does not
/// include implicitly providing generic parameters for the Self type, such as
/// using `Array` to mean `Array<Element>` in an extension of Array.) If
/// \p typeRepr is known to be absent, it's okay to pass \c false for
/// \p mayBeInferred.
void AccessControlCheckerBase::checkTypeAccessImpl(
Type type, TypeRepr *typeRepr, AccessScope contextAccessScope,
const DeclContext *useDC, bool mayBeInferred,
llvm::function_ref<CheckTypeAccessCallback> diagnose) {
auto &Context = useDC->getASTContext();
if (Context.isAccessControlDisabled())
return;
// Don't spend time checking local declarations; this is always valid by the
// time we get to this point.
if (contextAccessScope.isInContext() &&
contextAccessScope.getDeclContext()->isLocalContext())
return;
// Report where it was imported from.
if (contextAccessScope.isPublic() ||
contextAccessScope.isPackage()) {
auto SF = useDC->getParentSourceFile();
auto report = [&](const DeclRefTypeRepr *typeRepr, const ValueDecl *VD) {
ImportAccessLevel import = VD->getImportAccessFrom(useDC);
if (import.has_value()) {
if (SF) {
auto useLevel = contextAccessScope.isPublic() ? AccessLevel::Public
: AccessLevel::Package;
SF->registerAccessLevelUsingImport(import.value(), useLevel);
}
if (Context.LangOpts.EnableModuleApiImportRemarks) {
SourceLoc diagLoc = typeRepr? typeRepr->getLoc()
: extractNearestSourceLoc(useDC);
ModuleDecl *importedVia = import->module.importedModule,
*sourceModule = VD->getModuleContext();
Context.Diags.diagnose(diagLoc, diag::module_api_import,
VD, importedVia, sourceModule,
importedVia == sourceModule,
/*isImplicit*/!typeRepr);
}
}
};
if (typeRepr) {
typeRepr->walk(DeclRefTypeReprFinder([&](const DeclRefTypeRepr *TR) {
const ValueDecl *VD = TR->getBoundDecl();
report(TR, VD);
return true;
}));
} else if (type) {
type.walk(SimpleTypeDeclFinder([&](const ValueDecl *VD) {
report(/*typeRepr=*/nullptr, VD);
return TypeWalker::Action::Continue;
}));
}
};
AccessScope problematicAccessScope = AccessScope::getPublic();
if (type) {
std::optional<AccessScope> typeAccessScope =
TypeAccessScopeChecker::getAccessScope(type, useDC,
checkUsableFromInline);
// Note: This means that the type itself is invalid for this particular
// context, because it references declarations from two incompatible scopes.
// In this case we should have diagnosed the bad reference already.
if (!typeAccessScope.has_value())
return;
problematicAccessScope = *typeAccessScope;
}
auto downgradeToWarning = DowngradeToWarning::No;
// Check if type can be referenced in this context.
// - hasEqualDeclContextWith checks for matching scopes (public to public,
// internal to the same module, private to same scope, etc.)
// - isChildOf checks for use of public in internal, etc.
if (contextAccessScope.hasEqualDeclContextWith(problematicAccessScope) ||
contextAccessScope.isChildOf(problematicAccessScope)) {
// /Also/ check the TypeRepr, if present. This can be important when we're
// unable to preserve typealias sugar that's present in the TypeRepr.
if (!typeRepr)
return;
auto typeReprAccessScope =
TypeAccessScopeChecker::getAccessScope(typeRepr, useDC,
checkUsableFromInline);
if (!typeReprAccessScope.has_value())
return;
if (contextAccessScope.hasEqualDeclContextWith(*typeReprAccessScope) ||
contextAccessScope.isChildOf(*typeReprAccessScope)) {
// Only if both the Type and the TypeRepr follow the access rules can
// we exit; otherwise we have to emit a diagnostic.
return;
}
problematicAccessScope = *typeReprAccessScope;
} else {
// The type violates the rules of access control (with or without taking the
// TypeRepr into account).
if (typeRepr && mayBeInferred &&
!Context.LangOpts.isSwiftVersionAtLeast(5) &&
!useDC->getParentModule()->isResilient()) {
// Swift 4.2 and earlier didn't check the Type when a TypeRepr was
// present. However, this is a major hole when generic parameters are
// inferred:
//
// public let foo: Optional = VeryPrivateStruct()
//
// Downgrade the error to a warning in this case for source compatibility.
std::optional<AccessScope> typeReprAccessScope =
TypeAccessScopeChecker::getAccessScope(typeRepr, useDC,
checkUsableFromInline);
assert(typeReprAccessScope && "valid Type but not valid TypeRepr?");
if (contextAccessScope.hasEqualDeclContextWith(*typeReprAccessScope) ||
contextAccessScope.isChildOf(*typeReprAccessScope)) {
downgradeToWarning = DowngradeToWarning::Yes;
}
}
}
const DeclRefTypeRepr *complainRepr = findTypeDeclWithAccessScope(
typeRepr, problematicAccessScope, useDC, checkUsableFromInline);
ImportAccessLevel complainImport = std::nullopt;
if (complainRepr) {
const ValueDecl *VD = complainRepr->getBoundDecl();
assert(VD &&
"findTypeDeclWithAccessScope should return bound TypeReprs only");
complainImport = VD->getImportAccessFrom(useDC);
// Don't complain about an import that doesn't restrict the access
// level of the decl. This can happen with imported `package` decls.
if (complainImport.has_value() &&
complainImport->accessLevel >= VD->getFormalAccess())
complainImport = std::nullopt;
}
diagnose(problematicAccessScope, complainRepr, downgradeToWarning,
complainImport);
}
/// Checks if the access scope of the type described by \p TL is valid for the
/// type to be the type of \p context. If it isn't, calls \p diagnose with a
/// TypeRepr representing the offending part of \p TL.
///
/// The TypeRepr passed to \p diagnose may be null, in which case a particular
/// part of the type that caused the problem could not be found.
///
/// If \p type might be partially inferred even when \p typeRepr is present
/// (such as for properties), pass \c true for \p mayBeInferred. (This does not
/// include implicitly providing generic parameters for the Self type, such as
/// using `Array` to mean `Array<Element>` in an extension of Array.) If
/// \p typeRepr is known to be absent, it's okay to pass \c false for
/// \p mayBeInferred.
void AccessControlCheckerBase::checkTypeAccess(
Type type, TypeRepr *typeRepr, const ValueDecl *context, bool mayBeInferred,
llvm::function_ref<CheckTypeAccessCallback> diagnose) {
assert(!isa<ParamDecl>(context));
const DeclContext *DC = context->getDeclContext();
AccessScope contextAccessScope =
context->getFormalAccessScope(
context->getDeclContext(), checkUsableFromInline);
checkTypeAccessImpl(type, typeRepr, contextAccessScope, DC, mayBeInferred,
diagnose);
}
/// Highlights the given TypeRepr, and adds a note pointing to the type's
/// declaration if possible.
///
/// Just flushes \p diag as is if \p complainRepr is null.
static void highlightOffendingType(InFlightDiagnostic &diag,
const TypeRepr *complainRepr) {
if (!complainRepr) {
diag.flush();
return;
}
diag.highlight(complainRepr->getSourceRange());
diag.flush();
if (auto *declRefTR = dyn_cast<DeclRefTypeRepr>(complainRepr)) {
const ValueDecl *VD = declRefTR->getBoundDecl();
VD->diagnose(diag::kind_declared_here, DescriptiveDeclKind::Type);
}
}
/// Emit a note on \p limitImport when it restricted the access level
/// of a type.
static void noteLimitingImport(const Decl *userDecl,
ASTContext &ctx,
const ImportAccessLevel limitImport,
const TypeRepr *complainRepr) {
if (!limitImport.has_value())
return;
assert(limitImport->accessLevel != AccessLevel::Public &&
"a public import shouldn't limit the access level of a decl");
if (auto *declRefTR = dyn_cast_or_null<DeclRefTypeRepr>(complainRepr)) {
ValueDecl *VD = declRefTR->getBoundDecl();
// When using an IDE in a large file the decl_import_via_here note
// may be easy to miss on the import. Duplicate the information on the
// error line as well so it can't be missed.
if (userDecl)
userDecl->diagnose(diag::decl_import_via_local,
VD,
limitImport->accessLevel,
limitImport->module.importedModule);
if (limitImport->importLoc.isValid())
ctx.Diags.diagnose(limitImport->importLoc,
diag::decl_import_via_here,
VD,
limitImport->accessLevel,
limitImport->module.importedModule);
} else if (limitImport->importLoc.isValid()) {
ctx.Diags.diagnose(limitImport->importLoc, diag::module_imported_here,
limitImport->module.importedModule,
limitImport->accessLevel);
}
}
static void noteLimitingImport(const Decl *userDecl,
const ImportAccessLevel limitImport,
const TypeRepr *complainRepr) {
if (!limitImport.has_value())
return;
ASTContext &ctx = userDecl->getASTContext();
noteLimitingImport(userDecl, ctx, limitImport, complainRepr);
}
void AccessControlCheckerBase::checkGenericParamAccess(
const GenericContext *ownerCtx,
const Decl *ownerDecl,
AccessScope accessScope,
AccessLevel contextAccess) {
if (!ownerCtx->isGenericContext())
return;
// This must stay in sync with diag::generic_param_access.
enum class ACEK {
Parameter = 0,
Requirement
} accessControlErrorKind;
auto minAccessScope = AccessScope::getPublic();
const TypeRepr *complainRepr = nullptr;
auto downgradeToWarning = DowngradeToWarning::Yes;
ImportAccessLevel minImportLimit = std::nullopt;
auto callbackACEK = ACEK::Parameter;
auto callback = [&](AccessScope typeAccessScope,
const TypeRepr *thisComplainRepr,
DowngradeToWarning thisDowngrade,
ImportAccessLevel importLimit) {
if (typeAccessScope.isChildOf(minAccessScope) ||
(thisDowngrade == DowngradeToWarning::No &&
downgradeToWarning == DowngradeToWarning::Yes) ||
(!complainRepr &&
typeAccessScope.hasEqualDeclContextWith(minAccessScope))) {
minAccessScope = typeAccessScope;
complainRepr = thisComplainRepr;
accessControlErrorKind = callbackACEK;
downgradeToWarning = thisDowngrade;
minImportLimit = importLimit;
}
};
auto *DC = ownerDecl->getDeclContext();
if (auto params = ownerCtx->getGenericParams()) {
for (auto param : *params) {
auto inheritedEntries = param->getInherited().getEntries();
if (inheritedEntries.empty())
continue;
assert(inheritedEntries.size() == 1);
checkTypeAccessImpl(inheritedEntries.front().getType(),
inheritedEntries.front().getTypeRepr(), accessScope,
DC, /*mayBeInferred*/ false, callback);
}
}
callbackACEK = ACEK::Requirement;
if (ownerCtx->getTrailingWhereClause()) {
checkRequirementAccess(WhereClauseOwner(
const_cast<GenericContext *>(ownerCtx)),
accessScope, DC, callback);
}
if (minAccessScope.isPublic())
return;
// FIXME: Promote these to an error in the next -swift-version break.
if (isa<SubscriptDecl>(ownerDecl) || isa<TypeAliasDecl>(ownerDecl))
downgradeToWarning = DowngradeToWarning::Yes;
auto &Context = ownerDecl->getASTContext();
if (checkUsableFromInline) {
if (!Context.isSwiftVersionAtLeast(5))
downgradeToWarning = DowngradeToWarning::Yes;
auto diagID = diag::generic_param_usable_from_inline;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::generic_param_usable_from_inline_warn;
auto diag =
Context.Diags.diagnose(ownerDecl, diagID, ownerDecl->getDescriptiveKind(),
accessControlErrorKind == ACEK::Requirement);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(/*userDecl*/nullptr, Context, minImportLimit, complainRepr);
return;
}
auto minAccess = minAccessScope.accessLevelForDiagnostics();
bool isExplicit =
ownerDecl->getAttrs().hasAttribute<AccessControlAttr>() ||
isa<ProtocolDecl>(DC);
auto diagID = diag::generic_param_access;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::generic_param_access_warn;
auto diag = Context.Diags.diagnose(
ownerDecl, diagID, ownerDecl->getDescriptiveKind(), isExplicit,
contextAccess, minAccess, isa<FileUnit>(DC),
accessControlErrorKind == ACEK::Requirement);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(/*userDecl*/nullptr, Context, minImportLimit, complainRepr);
}
void AccessControlCheckerBase::checkGenericParamAccess(
const GenericContext *ownerCtx,
const ValueDecl *ownerDecl) {
checkGenericParamAccess(ownerCtx, ownerDecl,
ownerDecl->getFormalAccessScope(
nullptr, checkUsableFromInline),
ownerDecl->getFormalAccess());
}
void AccessControlCheckerBase::checkGlobalActorAccess(const Decl *D) {
auto VD = dyn_cast<ValueDecl>(D);
if (!VD)
return;
auto globalActorAttr = D->getGlobalActorAttr();
if (!globalActorAttr)
return;
auto customAttr = globalActorAttr->first;
auto globalActorDecl = globalActorAttr->second;
checkTypeAccess(
customAttr->getType(), customAttr->getTypeRepr(), VD,
/*mayBeInferred*/ false,
[&](AccessScope typeAccessScope, const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning, ImportAccessLevel importLimit) {
if (checkUsableFromInline) {
auto diag = D->diagnose(diag::global_actor_not_usable_from_inline,
VD);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(D, importLimit, complainRepr);
return;
}
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit = D->getAttrs().hasAttribute<AccessControlAttr>();
auto declAccess = isExplicit
? VD->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto diag = D->diagnose(diag::global_actor_access, declAccess, VD,
typeAccess, globalActorDecl->getName());
highlightOffendingType(diag, complainRepr);
noteLimitingImport(D, importLimit, complainRepr);
});
}
namespace {
class AccessControlChecker : public AccessControlCheckerBase,
public DeclVisitor<AccessControlChecker> {
public:
AccessControlChecker(bool allowUsableFromInline)
: AccessControlCheckerBase(allowUsableFromInline) {}
AccessControlChecker()
: AccessControlCheckerBase(/*checkUsableFromInline=*/false) {}
void visit(Decl *D) {
if (D->isInvalid() || D->isImplicit())
return;
DeclVisitor<AccessControlChecker>::visit(D);
checkGlobalActorAccess(D);
checkAttachedMacrosAccess(D);
}
// Force all kinds to be handled at a lower level.
void visitDecl(Decl *D) = delete;
void visitValueDecl(ValueDecl *D) = delete;
#define UNREACHABLE(KIND, REASON) \
void visit##KIND##Decl(KIND##Decl *D) { \
llvm_unreachable(REASON); \
}
UNREACHABLE(Import, "cannot appear in a type context")
UNREACHABLE(Extension, "cannot appear in a type context")
UNREACHABLE(TopLevelCode, "cannot appear in a type context")
UNREACHABLE(Operator, "cannot appear in a type context")
UNREACHABLE(PrecedenceGroup, "cannot appear in a type context")
UNREACHABLE(Module, "cannot appear in a type context")
UNREACHABLE(IfConfig, "does not have access control")
UNREACHABLE(PoundDiagnostic, "does not have access control")
UNREACHABLE(Param, "does not have access control")
UNREACHABLE(GenericTypeParam, "does not have access control")
UNREACHABLE(Missing, "does not have access control")
UNREACHABLE(MissingMember, "does not have access control")
UNREACHABLE(MacroExpansion, "does not have access control")
UNREACHABLE(BuiltinTuple, "BuiltinTupleDecl should not show up here")
#undef UNREACHABLE
#define UNINTERESTING(KIND) \
void visit##KIND##Decl(KIND##Decl *D) {}
UNINTERESTING(EnumCase) // Handled at the EnumElement level.
UNINTERESTING(Var) // Handled at the PatternBinding level.
UNINTERESTING(Destructor) // Always correct.
UNINTERESTING(Accessor) // Handled by the Var or Subscript.
/// \see visitPatternBindingDecl
void checkNamedPattern(const NamedPattern *NP, bool isTypeContext,
const llvm::DenseSet<const VarDecl *> &seenVars) {
const VarDecl *theVar = NP->getDecl();
if (seenVars.count(theVar) || theVar->isInvalid())
return;
checkTypeAccess(theVar->getInterfaceType(), nullptr, theVar,
/*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning,
ImportAccessLevel importLimit) {
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit = theVar->getAttrs().hasAttribute<AccessControlAttr>() ||
isa<ProtocolDecl>(theVar->getDeclContext());
auto theVarAccess =
isExplicit ? theVar->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto diagID = diag::pattern_type_access_inferred;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::pattern_type_access_inferred_warn;
auto &DE = theVar->getASTContext().Diags;
DE.diagnose(NP->getLoc(), diagID, theVar->isLet(),
isTypeContext, isExplicit, theVarAccess,
isa<FileUnit>(theVar->getDeclContext()),
typeAccess, theVar->getInterfaceType());
noteLimitingImport(theVar, importLimit, complainRepr);
});
}
void checkTypedPattern(const TypedPattern *TP, bool isTypeContext,
llvm::DenseSet<const VarDecl *> &seenVars) {
VarDecl *anyVar = nullptr;
TP->forEachVariable([&](VarDecl *V) {
seenVars.insert(V);
anyVar = V;
});
if (!anyVar)
return;
checkTypeAccess(TP->hasType() ? TP->getType() : Type(),
TP->getTypeRepr(), anyVar, /*mayBeInferred*/true,
[&](AccessScope typeAccessScope,
const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning,
ImportAccessLevel importLimit) {
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit = anyVar->getAttrs().hasAttribute<AccessControlAttr>() ||
isa<ProtocolDecl>(anyVar->getDeclContext());
auto diagID = diag::pattern_type_access;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::pattern_type_access_warn;
auto anyVarAccess =
isExplicit ? anyVar->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto &DE = anyVar->getASTContext().Diags;
auto diag = DE.diagnose(
TP->getLoc(), diagID, anyVar->isLet(), isTypeContext, isExplicit,
anyVarAccess, isa<FileUnit>(anyVar->getDeclContext()), typeAccess);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(anyVar, importLimit, complainRepr);
});
// Check the property wrapper types.
for (auto attr : anyVar->getAttachedPropertyWrappers()) {
checkTypeAccess(attr->getType(), attr->getTypeRepr(), anyVar,
/*mayBeInferred=*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning,
ImportAccessLevel importLimit) {
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit =
anyVar->getAttrs().hasAttribute<AccessControlAttr>() ||
isa<ProtocolDecl>(anyVar->getDeclContext());
auto anyVarAccess =
isExplicit ? anyVar->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto diag = anyVar->diagnose(diag::property_wrapper_type_access,
anyVar->isLet(),
isTypeContext,
isExplicit,
anyVarAccess,
isa<FileUnit>(anyVar->getDeclContext()),
typeAccess);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(anyVar, importLimit, complainRepr);
});
}
}
void visitPatternBindingDecl(PatternBindingDecl *PBD) {
bool isTypeContext = PBD->getDeclContext()->isTypeContext();
llvm::DenseSet<const VarDecl *> seenVars;
for (auto idx : range(PBD->getNumPatternEntries())) {
PBD->getPattern(idx)->forEachNode([&](const Pattern *P) {
if (auto *NP = dyn_cast<NamedPattern>(P)) {
// Only check individual variables if we didn't check an enclosing
// TypedPattern.
checkNamedPattern(NP, isTypeContext, seenVars);
return;
}
auto *TP = dyn_cast<TypedPattern>(P);
if (!TP)
return;
checkTypedPattern(TP, isTypeContext, seenVars);
});
seenVars.clear();
}
}
void visitTypeAliasDecl(TypeAliasDecl *TAD) {
checkGenericParamAccess(TAD, TAD);
checkTypeAccess(TAD->getUnderlyingType(),
TAD->getUnderlyingTypeRepr(), TAD, /*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning,
ImportAccessLevel importLimit) {
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit =
TAD->getAttrs().hasAttribute<AccessControlAttr>() ||
isa<ProtocolDecl>(TAD->getDeclContext());
auto diagID = diag::type_alias_underlying_type_access;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::type_alias_underlying_type_access_warn;
auto aliasAccess = isExplicit
? TAD->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto diag = TAD->diagnose(diagID, isExplicit, aliasAccess, typeAccess,
isa<FileUnit>(TAD->getDeclContext()));
highlightOffendingType(diag, complainRepr);
noteLimitingImport(TAD, importLimit, complainRepr);
});
}
void visitOpaqueTypeDecl(OpaqueTypeDecl *OTD) {
// TODO(opaque): The constraint class/protocols on the opaque interface, as
// well as the naming decl for the opaque type, need to be accessible.
}
void visitAssociatedTypeDecl(AssociatedTypeDecl *assocType) {
// This must stay in sync with diag::associated_type_access.
enum {
ACEK_DefaultDefinition = 0,
ACEK_Requirement
} accessControlErrorKind;
auto minAccessScope = AccessScope::getPublic();
const TypeRepr *complainRepr = nullptr;
auto downgradeToWarning = DowngradeToWarning::No;
ImportAccessLevel minImportLimit = std::nullopt;
for (TypeLoc requirement : assocType->getInherited().getEntries()) {
checkTypeAccess(requirement, assocType, /*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *thisComplainRepr,
DowngradeToWarning downgradeDiag,
ImportAccessLevel importLimit) {
if (typeAccessScope.isChildOf(minAccessScope) ||
(!complainRepr &&
typeAccessScope.hasEqualDeclContextWith(minAccessScope))) {
minAccessScope = typeAccessScope;
complainRepr = thisComplainRepr;
accessControlErrorKind = ACEK_Requirement;
downgradeToWarning = downgradeDiag;
minImportLimit = importLimit;
}
});
}
checkTypeAccess(assocType->getDefaultDefinitionType(),
assocType->getDefaultDefinitionTypeRepr(), assocType,
/*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *thisComplainRepr,
DowngradeToWarning downgradeDiag,
ImportAccessLevel importLimit) {
if (typeAccessScope.isChildOf(minAccessScope) ||
(!complainRepr &&
typeAccessScope.hasEqualDeclContextWith(minAccessScope))) {
minAccessScope = typeAccessScope;
complainRepr = thisComplainRepr;
accessControlErrorKind = ACEK_DefaultDefinition;
downgradeToWarning = downgradeDiag;
minImportLimit = importLimit;
}
});
checkRequirementAccess(assocType,
assocType->getFormalAccessScope(),
assocType->getDeclContext(),
[&](AccessScope typeAccessScope,
const TypeRepr *thisComplainRepr,
DowngradeToWarning downgradeDiag,
ImportAccessLevel importLimit) {
if (typeAccessScope.isChildOf(minAccessScope) ||
(!complainRepr &&
typeAccessScope.hasEqualDeclContextWith(minAccessScope))) {
minAccessScope = typeAccessScope;
complainRepr = thisComplainRepr;
accessControlErrorKind = ACEK_Requirement;
downgradeToWarning = downgradeDiag;
minImportLimit = importLimit;
// Swift versions before 5.0 did not check requirements on the
// protocol's where clause, so emit a warning.
if (!assocType->getASTContext().isSwiftVersionAtLeast(5))
downgradeToWarning = DowngradeToWarning::Yes;
}
});
if (!minAccessScope.isPublic()) {
auto minAccess = minAccessScope.accessLevelForDiagnostics();
auto diagID = diag::associated_type_access;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::associated_type_access_warn;
auto diag = assocType->diagnose(diagID, assocType->getFormalAccess(),
minAccess, accessControlErrorKind);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(assocType, minImportLimit, complainRepr);
}
}
void visitEnumDecl(EnumDecl *ED) {
checkGenericParamAccess(ED, ED);
if (ED->hasRawType()) {
Type rawType = ED->getRawType();
auto inheritedEntries = ED->getInherited().getEntries();
auto rawTypeLocIter = std::find_if(inheritedEntries.begin(),
inheritedEntries.end(),
[&](TypeLoc inherited) {
if (!inherited.wasValidated())
return false;
return inherited.getType().getPointer() == rawType.getPointer();
});
if (rawTypeLocIter == inheritedEntries.end())
return;
checkTypeAccess(rawType, rawTypeLocIter->getTypeRepr(), ED,
/*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning,
ImportAccessLevel importLimit) {
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit = ED->getAttrs().hasAttribute<AccessControlAttr>();
auto diagID = diag::enum_raw_type_access;
if (downgradeToWarning == DowngradeToWarning::Yes)
diagID = diag::enum_raw_type_access_warn;
auto enumDeclAccess = isExplicit
? ED->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto diag = ED->diagnose(diagID, isExplicit, enumDeclAccess, typeAccess,
isa<FileUnit>(ED->getDeclContext()));
highlightOffendingType(diag, complainRepr);
noteLimitingImport(ED, importLimit, complainRepr);
});
}
}
void visitStructDecl(StructDecl *SD) {
checkGenericParamAccess(SD, SD);
}
void visitClassDecl(ClassDecl *CD) {
checkGenericParamAccess(CD, CD);
if (const NominalTypeDecl *superclassDecl = CD->getSuperclassDecl()) {
// Be slightly defensive here in the presence of badly-ordered
// inheritance clauses.
auto inheritedEntries = CD->getInherited().getEntries();
auto superclassLocIter = std::find_if(inheritedEntries.begin(),
inheritedEntries.end(),
[&](TypeLoc inherited) {
if (!inherited.wasValidated())
return false;
Type ty = inherited.getType();
if (ty->is<ProtocolCompositionType>())
if (auto superclass = ty->getExistentialLayout().explicitSuperclass)
ty = superclass;
return ty->getAnyNominal() == superclassDecl;
});
// Soundness check: we couldn't find the superclass for whatever reason
// (possibly because it's synthetic or something), so don't bother
// checking it.
if (superclassLocIter == inheritedEntries.end())
return;
auto outerDowngradeToWarning = DowngradeToWarning::No;
if (superclassDecl->isGenericContext() &&
!CD->getASTContext().isSwiftVersionAtLeast(5)) {
// Swift 4 failed to properly check this if the superclass was generic,
// because the above loop was too strict.
outerDowngradeToWarning = DowngradeToWarning::Yes;
}
checkTypeAccess(CD->getSuperclass(), superclassLocIter->getTypeRepr(), CD,
/*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *complainRepr,
DowngradeToWarning downgradeToWarning,
ImportAccessLevel importLimit) {
auto typeAccess = typeAccessScope.accessLevelForDiagnostics();
bool isExplicit = CD->getAttrs().hasAttribute<AccessControlAttr>();
auto diagID = diag::class_super_access;
if (downgradeToWarning == DowngradeToWarning::Yes ||
outerDowngradeToWarning == DowngradeToWarning::Yes)
diagID = diag::class_super_access_warn;
auto classDeclAccess = isExplicit
? CD->getFormalAccess()
: typeAccessScope.requiredAccessForDiagnostics();
auto diag =
CD->diagnose(diagID, isExplicit, classDeclAccess, typeAccess,
isa<FileUnit>(CD->getDeclContext()),
superclassLocIter->getTypeRepr() != complainRepr);
highlightOffendingType(diag, complainRepr);
noteLimitingImport(CD, importLimit, complainRepr);
});
}
}
void visitProtocolDecl(ProtocolDecl *proto) {
// This must stay in sync with diag::protocol_access.
enum {
PCEK_Refine = 0,
PCEK_Requirement
} protocolControlErrorKind;
auto minAccessScope = AccessScope::getPublic();
const TypeRepr *complainRepr = nullptr;
auto downgradeToWarning = DowngradeToWarning::No;
ImportAccessLevel minImportLimit = std::nullopt;
DescriptiveDeclKind declKind = DescriptiveDeclKind::Protocol;
// FIXME: Hack to ensure that we've computed the types involved here.
auto inheritedTypes = proto->getInherited();
for (auto i : inheritedTypes.getIndices()) {
(void)inheritedTypes.getResolvedType(i);
}
auto declKindForType = [](Type type) -> DescriptiveDeclKind {
// If this is an existential type, use the decl kind of
// its constraint type.
if (auto existential = type->getAs<ExistentialType>())
type = existential->getConstraintType();
if (isa<TypeAliasType>(type.getPointer()))
return DescriptiveDeclKind::TypeAlias;
else if (auto nominal = type->getAnyNominal())
return nominal->getDescriptiveKind();
else
return DescriptiveDeclKind::Type;
};
for (TypeLoc requirement : proto->getInherited().getEntries()) {
checkTypeAccess(requirement, proto, /*mayBeInferred*/false,
[&](AccessScope typeAccessScope,
const TypeRepr *thisComplainRepr,
DowngradeToWarning downgradeDiag,
ImportAccessLevel importLimit) {
if (typeAccessScope.isChildOf(minAccessScope) ||
(!complainRepr &&
typeAccessScope.hasEqualDeclContextWith(minAccessScope))) {
minAccessScope = typeAccessScope;
complainRepr = thisComplainRepr;
protocolControlErrorKind = PCEK_Refine;
downgradeToWarning = downgradeDiag;