================
@@ -0,0 +1,989 @@
+//===--- SemaAPINotes.cpp - API Notes Handling
----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the mapping from API notes to declaration attributes.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/APINotes/APINotesReader.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclObjC.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Sema/SemaInternal.h"
+
+using namespace clang;
+
+namespace {
+enum class IsActive_t : bool { Inactive, Active };
+enum class IsReplacement_t : bool { Original, Replacement };
+
+struct VersionedInfoMetadata {
+ /// An empty version refers to unversioned metadata.
+ VersionTuple Version;
+ unsigned IsActive : 1;
+ unsigned IsReplacement : 1;
+
+ VersionedInfoMetadata(VersionTuple Version, IsActive_t Active,
+ IsReplacement_t Replacement)
+ : Version(Version), IsActive(Active == IsActive_t::Active),
+ IsReplacement(Replacement == IsReplacement_t::Replacement) {}
+};
+} // end anonymous namespace
+
+/// Determine whether this is a multi-level pointer type.
+static bool isIndirectPointerType(QualType Type) {
+ QualType Pointee = Type->getPointeeType();
+ if (Pointee.isNull())
+ return false;
+
+ return Pointee->isAnyPointerType() || Pointee->isObjCObjectPointerType() ||
+ Pointee->isMemberPointerType();
+}
+
+/// Apply nullability to the given declaration.
+static void applyNullability(Sema &S, Decl *D, NullabilityKind Nullability,
+ VersionedInfoMetadata Metadata) {
+ if (!Metadata.IsActive)
+ return;
+
+ auto IsUnmodified = [&](Decl *D, QualType QT,
+ NullabilityKind Nullability) -> bool {
+ QualType Original = QT;
+ S.CheckImplicitNullabilityTypeSpecifier(QT, Nullability, D->getLocation(),
+ isa<ParmVarDecl>(D),
+ /*OverrideExisting=*/true);
+ return QT.getTypePtr() == Original.getTypePtr();
+ };
+
+ if (auto Function = dyn_cast<FunctionDecl>(D)) {
+ if (!IsUnmodified(D, Function->getReturnType(), Nullability)) {
+ QualType FnType = Function->getType();
+ Function->setType(FnType);
+ }
+ } else if (auto Method = dyn_cast<ObjCMethodDecl>(D)) {
+ QualType Type = Method->getReturnType();
+ if (!IsUnmodified(D, Type, Nullability)) {
+ Method->setReturnType(Type);
+
+ // Make it a context-sensitive keyword if we can.
+ if (!isIndirectPointerType(Type))
+ Method->setObjCDeclQualifier(Decl::ObjCDeclQualifier(
+ Method->getObjCDeclQualifier() | Decl::OBJC_TQ_CSNullability));
+ }
+ } else if (auto Value = dyn_cast<ValueDecl>(D)) {
+ QualType Type = Value->getType();
+ if (!IsUnmodified(D, Type, Nullability)) {
+ Value->setType(Type);
+
+ // Make it a context-sensitive keyword if we can.
+ if (auto Parm = dyn_cast<ParmVarDecl>(D)) {
+ if (Parm->isObjCMethodParameter() && !isIndirectPointerType(Type))
+ Parm->setObjCDeclQualifier(Decl::ObjCDeclQualifier(
+ Parm->getObjCDeclQualifier() | Decl::OBJC_TQ_CSNullability));
+ }
+ }
+ } else if (auto Property = dyn_cast<ObjCPropertyDecl>(D)) {
+ QualType Type = Property->getType();
+ if (!IsUnmodified(D, Type, Nullability)) {
+ Property->setType(Type, Property->getTypeSourceInfo());
+
+ // Make it a property attribute if we can.
+ if (!isIndirectPointerType(Type))
+ Property->setPropertyAttributes(
+ ObjCPropertyAttribute::kind_null_resettable);
+ }
+ }
+}
+
+/// Copy a string into ASTContext-allocated memory.
+static StringRef ASTAllocateString(ASTContext &Ctx, StringRef String) {
+ void *mem = Ctx.Allocate(String.size(), alignof(char *));
+ memcpy(mem, String.data(), String.size());
+ return StringRef(static_cast<char *>(mem), String.size());
+}
+
+static AttributeCommonInfo getPlaceholderAttrInfo() {
+ return AttributeCommonInfo(SourceRange(),
+ AttributeCommonInfo::UnknownAttribute,
+ {AttributeCommonInfo::AS_GNU,
+ /*Spelling*/ 0, /*IsAlignas*/ false,
+ /*IsRegularKeywordAttribute*/ false});
+}
+
+namespace {
+template <typename A> struct AttrKindFor {};
+
+#define ATTR(X)
\
+ template <> struct AttrKindFor<X##Attr> {
\
+ static const attr::Kind value = attr::X;
\
+ };
+#include "clang/Basic/AttrList.inc"
+
+/// Handle an attribute introduced by API notes.
+///
+/// \param IsAddition Whether we should add a new attribute
+/// (otherwise, we might remove an existing attribute).
+/// \param CreateAttr Create the new attribute to be added.
+template <typename A>
+void handleAPINotedAttribute(
+ Sema &S, Decl *D, bool IsAddition, VersionedInfoMetadata Metadata,
+ llvm::function_ref<A *()> CreateAttr,
+ llvm::function_ref<Decl::attr_iterator(const Decl *)> GetExistingAttr) {
+ if (Metadata.IsActive) {
+ auto Existing = GetExistingAttr(D);
+ if (Existing != D->attr_end()) {
+ // Remove the existing attribute, and treat it as a superseded
+ // non-versioned attribute.
+ auto *Versioned = SwiftVersionedAdditionAttr::CreateImplicit(
+ S.Context, Metadata.Version, *Existing, /*IsReplacedByActive*/ true);
+
+ D->getAttrs().erase(Existing);
+ D->addAttr(Versioned);
+ }
+
+ // If we're supposed to add a new attribute, do so.
+ if (IsAddition) {
+ if (auto Attr = CreateAttr())
+ D->addAttr(Attr);
+ }
+
+ } else {
+ if (IsAddition) {
+ if (auto Attr = CreateAttr()) {
+ auto *Versioned = SwiftVersionedAdditionAttr::CreateImplicit(
+ S.Context, Metadata.Version, Attr,
+ /*IsReplacedByActive*/ Metadata.IsReplacement);
+ D->addAttr(Versioned);
+ }
+ } else {
+ // FIXME: This isn't preserving enough information for things like
+ // availability, where we're trying to remove a /specific/ kind of
+ // attribute.
+ auto *Versioned = SwiftVersionedRemovalAttr::CreateImplicit(
+ S.Context, Metadata.Version, AttrKindFor<A>::value,
+ /*IsReplacedByActive*/ Metadata.IsReplacement);
+ D->addAttr(Versioned);
+ }
+ }
+}
+
+template <typename A>
+void handleAPINotedAttribute(Sema &S, Decl *D, bool ShouldAddAttribute,
+ VersionedInfoMetadata Metadata,
+ llvm::function_ref<A *()> CreateAttr) {
+ handleAPINotedAttribute<A>(
+ S, D, ShouldAddAttribute, Metadata, CreateAttr, [](const Decl *D) {
+ return llvm::find_if(D->attrs(),
+ [](const Attr *Next) { return isa<A>(Next); });
+ });
+}
+} // namespace
+
+template <typename A = CFReturnsRetainedAttr>
+static void handleAPINotedRetainCountAttribute(Sema &S, Decl *D,
+ bool ShouldAddAttribute,
+ VersionedInfoMetadata Metadata)
{
+ // The template argument has a default to make the "removal" case more
+ // concise; it doesn't matter /which/ attribute is being removed.
+ handleAPINotedAttribute<A>(
+ S, D, ShouldAddAttribute, Metadata,
+ [&] { return new (S.Context) A(S.Context, getPlaceholderAttrInfo()); },
+ [](const Decl *D) -> Decl::attr_iterator {
+ return llvm::find_if(D->attrs(), [](const Attr *Next) -> bool {
+ return isa<CFReturnsRetainedAttr>(Next) ||
+ isa<CFReturnsNotRetainedAttr>(Next) ||
+ isa<NSReturnsRetainedAttr>(Next) ||
+ isa<NSReturnsNotRetainedAttr>(Next) ||
+ isa<CFAuditedTransferAttr>(Next);
+ });
+ });
+}
+
+static void handleAPINotedRetainCountConvention(
+ Sema &S, Decl *D, VersionedInfoMetadata Metadata,
+ std::optional<api_notes::RetainCountConventionKind> Convention) {
+ if (!Convention)
+ return;
+ switch (*Convention) {
+ case api_notes::RetainCountConventionKind::None:
+ if (isa<FunctionDecl>(D)) {
+ handleAPINotedRetainCountAttribute<CFUnknownTransferAttr>(
+ S, D, /*shouldAddAttribute*/ true, Metadata);
+ } else {
+ handleAPINotedRetainCountAttribute(S, D, /*shouldAddAttribute*/ false,
+ Metadata);
+ }
+ break;
+ case api_notes::RetainCountConventionKind::CFReturnsRetained:
+ handleAPINotedRetainCountAttribute<CFReturnsRetainedAttr>(
+ S, D, /*shouldAddAttribute*/ true, Metadata);
+ break;
+ case api_notes::RetainCountConventionKind::CFReturnsNotRetained:
+ handleAPINotedRetainCountAttribute<CFReturnsNotRetainedAttr>(
+ S, D, /*shouldAddAttribute*/ true, Metadata);
+ break;
+ case api_notes::RetainCountConventionKind::NSReturnsRetained:
+ handleAPINotedRetainCountAttribute<NSReturnsRetainedAttr>(
+ S, D, /*shouldAddAttribute*/ true, Metadata);
+ break;
+ case api_notes::RetainCountConventionKind::NSReturnsNotRetained:
+ handleAPINotedRetainCountAttribute<NSReturnsNotRetainedAttr>(
+ S, D, /*shouldAddAttribute*/ true, Metadata);
+ break;
+ }
+}
+
+static void ProcessAPINotes(Sema &S, Decl *D,
+ const api_notes::CommonEntityInfo &Info,
+ VersionedInfoMetadata Metadata) {
+ // Availability
+ if (Info.Unavailable) {
+ handleAPINotedAttribute<UnavailableAttr>(S, D, true, Metadata, [&] {
+ return new (S.Context)
+ UnavailableAttr(S.Context, getPlaceholderAttrInfo(),
+ ASTAllocateString(S.Context, Info.UnavailableMsg));
+ });
+ }
+
+ if (Info.UnavailableInSwift) {
+ handleAPINotedAttribute<AvailabilityAttr>(
+ S, D, true, Metadata,
+ [&] {
+ return new (S.Context) AvailabilityAttr(
+ S.Context, getPlaceholderAttrInfo(),
+ &S.Context.Idents.get("swift"), VersionTuple(), VersionTuple(),
+ VersionTuple(),
+ /*Unavailable=*/true,
+ ASTAllocateString(S.Context, Info.UnavailableMsg),
+ /*Strict=*/false,
+ /*Replacement=*/StringRef(),
+ /*Priority=*/Sema::AP_Explicit);
+ },
+ [](const Decl *D) {
+ return llvm::find_if(D->attrs(), [](const Attr *next) -> bool {
+ if (const auto *AA = dyn_cast<AvailabilityAttr>(next))
+ if (const auto *II = AA->getPlatform())
+ return II->isStr("swift");
+ return false;
+ });
+ });
+ }
+
+ // swift_private
+ if (auto SwiftPrivate = Info.isSwiftPrivate()) {
+ handleAPINotedAttribute<SwiftPrivateAttr>(
+ S, D, *SwiftPrivate, Metadata, [&] {
+ return new (S.Context)
+ SwiftPrivateAttr(S.Context, getPlaceholderAttrInfo());
+ });
+ }
+
+ // swift_name
+ if (!Info.SwiftName.empty()) {
+ handleAPINotedAttribute<SwiftNameAttr>(
+ S, D, true, Metadata, [&]() -> SwiftNameAttr * {
+ AttributeFactory AF{};
+ AttributePool AP{AF};
+ auto &C = S.getASTContext();
+ ParsedAttr *SNA =
+ AP.create(&C.Idents.get("swift_name"), SourceRange(), nullptr,
+ SourceLocation(), nullptr, nullptr, nullptr,
+ ParsedAttr::Form::GNU());
+
+ if (!S.DiagnoseSwiftName(D, Info.SwiftName, D->getLocation(), *SNA,
+ /*IsAsync=*/false))
+ return nullptr;
+
+ return new (S.Context)
+ SwiftNameAttr(S.Context, getPlaceholderAttrInfo(),
+ ASTAllocateString(S.Context, Info.SwiftName));
+ });
+ }
+}
+
+static void ProcessAPINotes(Sema &S, Decl *D,
+ const api_notes::CommonTypeInfo &Info,
+ VersionedInfoMetadata Metadata) {
+ // swift_bridge
+ if (auto SwiftBridge = Info.getSwiftBridge()) {
+ handleAPINotedAttribute<SwiftBridgeAttr>(
+ S, D, !SwiftBridge->empty(), Metadata, [&] {
+ return new (S.Context)
+ SwiftBridgeAttr(S.Context, getPlaceholderAttrInfo(),
+ ASTAllocateString(S.Context, *SwiftBridge));
+ });
+ }
+
+ // ns_error_domain
+ if (auto NSErrorDomain = Info.getNSErrorDomain()) {
+ handleAPINotedAttribute<NSErrorDomainAttr>(
+ S, D, !NSErrorDomain->empty(), Metadata, [&] {
+ return new (S.Context)
+ NSErrorDomainAttr(S.Context, getPlaceholderAttrInfo(),
+ &S.Context.Idents.get(*NSErrorDomain));
+ });
+ }
+
+ ProcessAPINotes(S, D, static_cast<const api_notes::CommonEntityInfo &>(Info),
+ Metadata);
+}
+
+/// Check that the replacement type provided by API notes is reasonable.
+///
+/// This is a very weak form of ABI check.
+static bool checkAPINotesReplacementType(Sema &S, SourceLocation Loc,
+ QualType OrigType,
+ QualType ReplacementType) {
+ if (S.Context.getTypeSize(OrigType) !=
+ S.Context.getTypeSize(ReplacementType)) {
+ S.Diag(Loc, diag::err_incompatible_replacement_type)
+ << ReplacementType << OrigType;
+ return true;
+ }
+
+ return false;
----------------
compnerd wrote:
An early return feels like it is slightly beneficial.
```suggestion
if (S.Context.getTypeSize(OrigType) ==
S.Context.getTypeSize(ReplacementType))
return false;
S.Diag(Loc, diag::err_incompatible_replacement_type)
<< ReplacementType << OrigType;
return true;
```
https://github.com/llvm/llvm-project/pull/78445
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