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f3ff561c6f
This is phase-1 of switching from llvm::Optional to std::optional in the
next rebranch. llvm::Optional was removed from upstream LLVM, so we need
to migrate off rather soon. On Darwin, std::optional, and llvm::Optional
have the same layout, so we don't need to be as concerned about ABI
beyond the name mangling. `llvm::Optional` is only returned from one
function in
```
getStandardTypeSubst(StringRef TypeName,
bool allowConcurrencyManglings);
```
It's the return value, so it should not impact the mangling of the
function, and the layout is the same as `std::optional`, so it should be
mostly okay. This function doesn't appear to have users, and the ABI was
already broken 2 years ago for concurrency and no one seemed to notice
so this should be "okay".
I'm doing the migration incrementally so that folks working on main can
cherry-pick back to the release/5.9 branch. Once 5.9 is done and locked
away, then we can go through and finish the replacement. Since `None`
and `Optional` show up in contexts where they are not `llvm::None` and
`llvm::Optional`, I'm preparing the work now by going through and
removing the namespace unwrapping and making the `llvm` namespace
explicit. This should make it fairly mechanical to go through and
replace llvm::Optional with std::optional, and llvm::None with
std::nullopt. It's also a change that can be brought onto the
release/5.9 with minimal impact. This should be an NFC change.
139 lines
4.7 KiB
C++
139 lines
4.7 KiB
C++
//===--- ClangModule.h - An imported Clang module ---------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements support for loading Clang modules into Swift.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_CLANGIMPORTER_CLANGMODULE_H
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#define SWIFT_CLANGIMPORTER_CLANGMODULE_H
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#include "swift/AST/FileUnit.h"
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#include "swift/ClangImporter/ClangImporter.h"
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#include "clang/AST/ExternalASTSource.h"
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#include "clang/Basic/Module.h"
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namespace clang {
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class ASTContext;
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class Module;
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}
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namespace swift {
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class ASTContext;
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class ModuleLoader;
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/// Represents a Clang module that has been imported into Swift.
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class ClangModuleUnit final : public LoadedFile {
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ClangImporter::Implementation &owner;
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const clang::Module *clangModule;
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llvm::PointerIntPair<ModuleDecl *, 1, bool> overlayModule;
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mutable llvm::Optional<ArrayRef<ImportedModule>> importedModulesForLookup;
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/// The metadata of the underlying Clang module.
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clang::ASTSourceDescriptor ASTSourceDescriptor;
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public:
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/// True if the given Module contains an imported Clang module unit.
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static bool hasClangModule(ModuleDecl *M);
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ClangModuleUnit(ModuleDecl &M, ClangImporter::Implementation &owner,
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const clang::Module *clangModule);
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/// Retrieve the underlying Clang module.
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///
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/// This will be null if the module unit represents the imported headers.
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const clang::Module *getClangModule() const { return clangModule; }
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/// Returns true if this is a top-level Clang module (not a submodule).
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bool isTopLevel() const;
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/// Returns the Swift module that overlays this Clang module.
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ModuleDecl *getOverlayModule() const override;
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/// Retrieve the "exported" name of the module, which is usually the module
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/// real name, but might be the name of the public module through which this
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/// (private) module is re-exported.
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StringRef getExportedModuleName() const override;
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virtual bool isSystemModule() const override;
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virtual void lookupValue(DeclName name, NLKind lookupKind,
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OptionSet<ModuleLookupFlags> Flags,
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SmallVectorImpl<ValueDecl*> &results) const override;
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virtual TypeDecl *
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lookupNestedType(Identifier name,
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const NominalTypeDecl *baseType) const override;
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virtual void lookupVisibleDecls(ImportPath::Access accessPath,
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VisibleDeclConsumer &consumer,
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NLKind lookupKind) const override;
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virtual void lookupClassMembers(ImportPath::Access accessPath,
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VisibleDeclConsumer &consumer) const override;
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virtual void
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lookupClassMember(ImportPath::Access accessPath, DeclName name,
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SmallVectorImpl<ValueDecl*> &decls) const override;
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void lookupObjCMethods(
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ObjCSelector selector,
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SmallVectorImpl<AbstractFunctionDecl *> &results) const override;
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virtual bool shouldCollectDisplayDecls() const override;
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virtual void getTopLevelDecls(SmallVectorImpl<Decl*> &results) const override;
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virtual void getDisplayDecls(SmallVectorImpl<Decl*> &results, bool recursive = false) const override;
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virtual void
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getImportedModules(SmallVectorImpl<ImportedModule> &imports,
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ModuleDecl::ImportFilter filter) const override;
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virtual void getImportedModulesForLookup(
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SmallVectorImpl<ImportedModule> &imports) const override;
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virtual void
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collectLinkLibraries(ModuleDecl::LinkLibraryCallback callback) const override;
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Identifier
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getDiscriminatorForPrivateDecl(const Decl *D) const override {
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llvm_unreachable("no private decls in Clang modules");
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}
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virtual StringRef getFilename() const override;
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virtual StringRef getLoadedFilename() const override;
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virtual const clang::Module *getUnderlyingClangModule() const override {
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return getClangModule();
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}
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clang::ASTContext &getClangASTContext() const;
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/// Returns the ASTSourceDescriptor of the associated Clang module if one
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/// exists.
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llvm::Optional<clang::ASTSourceDescriptor> getASTSourceDescriptor() const;
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virtual StringRef getModuleDefiningPath() const override;
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static bool classof(const FileUnit *file) {
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return file->getKind() == FileUnitKind::ClangModule;
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}
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static bool classof(const DeclContext *DC) {
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return isa<FileUnit>(DC) && classof(cast<FileUnit>(DC));
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}
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};
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}
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#endif
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