568 lines
21 KiB
C++
568 lines
21 KiB
C++
//===--- ModuleMap.h - Describe the layout of modules -----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the ModuleMap interface, which describes the layout of a
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// module as it relates to headers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LEX_MODULEMAP_H
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#define LLVM_CLANG_LEX_MODULEMAP_H
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#include "clang/Basic/LangOptions.h"
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#include "clang/Basic/Module.h"
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#include "clang/Basic/SourceLocation.h"
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#include "clang/Basic/SourceManager.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include <algorithm>
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#include <memory>
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#include <string>
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#include <utility>
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namespace clang {
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class DirectoryEntry;
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class FileEntry;
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class FileManager;
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class DiagnosticConsumer;
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class DiagnosticsEngine;
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class HeaderSearch;
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class ModuleMapParser;
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/// \brief A mechanism to observe the actions of the module map parser as it
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/// reads module map files.
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class ModuleMapCallbacks {
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public:
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virtual ~ModuleMapCallbacks() = default;
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/// \brief Called when a module map file has been read.
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///
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/// \param FileStart A SourceLocation referring to the start of the file's
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/// contents.
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/// \param File The file itself.
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/// \param IsSystem Whether this is a module map from a system include path.
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virtual void moduleMapFileRead(SourceLocation FileStart,
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const FileEntry &File, bool IsSystem) {}
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/// \brief Called when a header is added during module map parsing.
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///
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/// \param Filename The header file itself.
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virtual void moduleMapAddHeader(StringRef Filename) {}
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/// \brief Called when an umbrella header is added during module map parsing.
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///
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/// \param FileMgr FileManager instance
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/// \param Header The umbrella header to collect.
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virtual void moduleMapAddUmbrellaHeader(FileManager *FileMgr,
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const FileEntry *Header) {}
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};
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class ModuleMap {
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SourceManager &SourceMgr;
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DiagnosticsEngine &Diags;
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const LangOptions &LangOpts;
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const TargetInfo *Target;
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HeaderSearch &HeaderInfo;
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llvm::SmallVector<std::unique_ptr<ModuleMapCallbacks>, 1> Callbacks;
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/// \brief The directory used for Clang-supplied, builtin include headers,
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/// such as "stdint.h".
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const DirectoryEntry *BuiltinIncludeDir;
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/// \brief Language options used to parse the module map itself.
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///
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/// These are always simple C language options.
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LangOptions MMapLangOpts;
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// The module that the main source file is associated with (the module
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// named LangOpts::CurrentModule, if we've loaded it).
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Module *SourceModule;
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/// \brief The top-level modules that are known.
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llvm::StringMap<Module *> Modules;
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/// \brief The number of modules we have created in total.
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unsigned NumCreatedModules;
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public:
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/// \brief Flags describing the role of a module header.
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enum ModuleHeaderRole {
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/// \brief This header is normally included in the module.
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NormalHeader = 0x0,
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/// \brief This header is included but private.
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PrivateHeader = 0x1,
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/// \brief This header is part of the module (for layering purposes) but
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/// should be textually included.
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TextualHeader = 0x2,
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// Caution: Adding an enumerator needs other changes.
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// Adjust the number of bits for KnownHeader::Storage.
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// Adjust the bitfield HeaderFileInfo::HeaderRole size.
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// Adjust the HeaderFileInfoTrait::ReadData streaming.
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// Adjust the HeaderFileInfoTrait::EmitData streaming.
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// Adjust ModuleMap::addHeader.
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};
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/// \brief A header that is known to reside within a given module,
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/// whether it was included or excluded.
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class KnownHeader {
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llvm::PointerIntPair<Module *, 2, ModuleHeaderRole> Storage;
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public:
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KnownHeader() : Storage(nullptr, NormalHeader) { }
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KnownHeader(Module *M, ModuleHeaderRole Role) : Storage(M, Role) { }
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friend bool operator==(const KnownHeader &A, const KnownHeader &B) {
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return A.Storage == B.Storage;
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}
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friend bool operator!=(const KnownHeader &A, const KnownHeader &B) {
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return A.Storage != B.Storage;
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}
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/// \brief Retrieve the module the header is stored in.
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Module *getModule() const { return Storage.getPointer(); }
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/// \brief The role of this header within the module.
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ModuleHeaderRole getRole() const { return Storage.getInt(); }
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/// \brief Whether this header is available in the module.
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bool isAvailable() const {
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return getModule()->isAvailable();
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}
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/// \brief Whether this header is accessible from the specified module.
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bool isAccessibleFrom(Module *M) const {
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return !(getRole() & PrivateHeader) ||
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(M && M->getTopLevelModule() == getModule()->getTopLevelModule());
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}
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// \brief Whether this known header is valid (i.e., it has an
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// associated module).
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explicit operator bool() const {
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return Storage.getPointer() != nullptr;
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}
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};
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typedef llvm::SmallPtrSet<const FileEntry *, 1> AdditionalModMapsSet;
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private:
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typedef llvm::DenseMap<const FileEntry *, SmallVector<KnownHeader, 1>>
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HeadersMap;
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/// \brief Mapping from each header to the module that owns the contents of
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/// that header.
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HeadersMap Headers;
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/// \brief Mapping from directories with umbrella headers to the module
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/// that is generated from the umbrella header.
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///
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/// This mapping is used to map headers that haven't explicitly been named
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/// in the module map over to the module that includes them via its umbrella
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/// header.
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llvm::DenseMap<const DirectoryEntry *, Module *> UmbrellaDirs;
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/// \brief The set of attributes that can be attached to a module.
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struct Attributes {
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Attributes()
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: IsSystem(), IsExternC(), IsExhaustive(), NoUndeclaredIncludes() {}
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/// \brief Whether this is a system module.
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unsigned IsSystem : 1;
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/// \brief Whether this is an extern "C" module.
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unsigned IsExternC : 1;
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/// \brief Whether this is an exhaustive set of configuration macros.
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unsigned IsExhaustive : 1;
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/// \brief Whether files in this module can only include non-modular headers
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/// and headers from used modules.
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unsigned NoUndeclaredIncludes : 1;
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};
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/// \brief A directory for which framework modules can be inferred.
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struct InferredDirectory {
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InferredDirectory() : InferModules() {}
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/// \brief Whether to infer modules from this directory.
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unsigned InferModules : 1;
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/// \brief The attributes to use for inferred modules.
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Attributes Attrs;
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/// \brief If \c InferModules is non-zero, the module map file that allowed
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/// inferred modules. Otherwise, nullptr.
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const FileEntry *ModuleMapFile;
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/// \brief The names of modules that cannot be inferred within this
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/// directory.
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SmallVector<std::string, 2> ExcludedModules;
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};
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/// \brief A mapping from directories to information about inferring
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/// framework modules from within those directories.
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llvm::DenseMap<const DirectoryEntry *, InferredDirectory> InferredDirectories;
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/// A mapping from an inferred module to the module map that allowed the
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/// inference.
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llvm::DenseMap<const Module *, const FileEntry *> InferredModuleAllowedBy;
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llvm::DenseMap<const Module *, AdditionalModMapsSet> AdditionalModMaps;
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/// \brief Describes whether we haved parsed a particular file as a module
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/// map.
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llvm::DenseMap<const FileEntry *, bool> ParsedModuleMap;
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friend class ModuleMapParser;
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/// \brief Resolve the given export declaration into an actual export
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/// declaration.
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///
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/// \param Mod The module in which we're resolving the export declaration.
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///
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/// \param Unresolved The export declaration to resolve.
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///
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/// \param Complain Whether this routine should complain about unresolvable
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/// exports.
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///
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/// \returns The resolved export declaration, which will have a NULL pointer
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/// if the export could not be resolved.
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Module::ExportDecl
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resolveExport(Module *Mod, const Module::UnresolvedExportDecl &Unresolved,
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bool Complain) const;
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/// \brief Resolve the given module id to an actual module.
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///
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/// \param Id The module-id to resolve.
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///
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/// \param Mod The module in which we're resolving the module-id.
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///
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/// \param Complain Whether this routine should complain about unresolvable
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/// module-ids.
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///
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/// \returns The resolved module, or null if the module-id could not be
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/// resolved.
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Module *resolveModuleId(const ModuleId &Id, Module *Mod, bool Complain) const;
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/// \brief Looks up the modules that \p File corresponds to.
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///
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/// If \p File represents a builtin header within Clang's builtin include
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/// directory, this also loads all of the module maps to see if it will get
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/// associated with a specific module (e.g. in /usr/include).
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HeadersMap::iterator findKnownHeader(const FileEntry *File);
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/// \brief Searches for a module whose umbrella directory contains \p File.
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///
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/// \param File The header to search for.
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///
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/// \param IntermediateDirs On success, contains the set of directories
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/// searched before finding \p File.
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KnownHeader findHeaderInUmbrellaDirs(const FileEntry *File,
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SmallVectorImpl<const DirectoryEntry *> &IntermediateDirs);
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/// \brief Given that \p File is not in the Headers map, look it up within
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/// umbrella directories and find or create a module for it.
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KnownHeader findOrCreateModuleForHeaderInUmbrellaDir(const FileEntry *File);
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/// \brief A convenience method to determine if \p File is (possibly nested)
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/// in an umbrella directory.
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bool isHeaderInUmbrellaDirs(const FileEntry *File) {
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SmallVector<const DirectoryEntry *, 2> IntermediateDirs;
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return static_cast<bool>(findHeaderInUmbrellaDirs(File, IntermediateDirs));
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}
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Module *inferFrameworkModule(const DirectoryEntry *FrameworkDir,
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Attributes Attrs, Module *Parent);
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public:
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/// \brief Construct a new module map.
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///
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/// \param SourceMgr The source manager used to find module files and headers.
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/// This source manager should be shared with the header-search mechanism,
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/// since they will refer to the same headers.
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///
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/// \param Diags A diagnostic engine used for diagnostics.
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///
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/// \param LangOpts Language options for this translation unit.
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///
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/// \param Target The target for this translation unit.
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ModuleMap(SourceManager &SourceMgr, DiagnosticsEngine &Diags,
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const LangOptions &LangOpts, const TargetInfo *Target,
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HeaderSearch &HeaderInfo);
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/// \brief Destroy the module map.
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///
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~ModuleMap();
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/// \brief Set the target information.
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void setTarget(const TargetInfo &Target);
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/// \brief Set the directory that contains Clang-supplied include
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/// files, such as our stdarg.h or tgmath.h.
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void setBuiltinIncludeDir(const DirectoryEntry *Dir) {
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BuiltinIncludeDir = Dir;
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}
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/// \brief Get the directory that contains Clang-supplied include files.
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const DirectoryEntry *getBuiltinDir() const {
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return BuiltinIncludeDir;
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}
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/// \brief Is this a compiler builtin header?
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static bool isBuiltinHeader(StringRef FileName);
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/// \brief Add a module map callback.
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void addModuleMapCallbacks(std::unique_ptr<ModuleMapCallbacks> Callback) {
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Callbacks.push_back(std::move(Callback));
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}
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/// \brief Retrieve the module that owns the given header file, if any.
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///
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/// \param File The header file that is likely to be included.
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///
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/// \param AllowTextual If \c true and \p File is a textual header, return
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/// its owning module. Otherwise, no KnownHeader will be returned if the
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/// file is only known as a textual header.
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///
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/// \returns The module KnownHeader, which provides the module that owns the
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/// given header file. The KnownHeader is default constructed to indicate
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/// that no module owns this header file.
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KnownHeader findModuleForHeader(const FileEntry *File,
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bool AllowTextual = false);
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/// \brief Retrieve all the modules that contain the given header file. This
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/// may not include umbrella modules, nor information from external sources,
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/// if they have not yet been inferred / loaded.
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///
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/// Typically, \ref findModuleForHeader should be used instead, as it picks
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/// the preferred module for the header.
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ArrayRef<KnownHeader> findAllModulesForHeader(const FileEntry *File) const;
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/// \brief Reports errors if a module must not include a specific file.
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///
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/// \param RequestingModule The module including a file.
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///
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/// \param RequestingModuleIsModuleInterface \c true if the inclusion is in
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/// the interface of RequestingModule, \c false if it's in the
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/// implementation of RequestingModule. Value is ignored and
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/// meaningless if RequestingModule is nullptr.
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///
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/// \param FilenameLoc The location of the inclusion's filename.
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///
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/// \param Filename The included filename as written.
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///
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/// \param File The included file.
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void diagnoseHeaderInclusion(Module *RequestingModule,
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bool RequestingModuleIsModuleInterface,
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SourceLocation FilenameLoc, StringRef Filename,
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const FileEntry *File);
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/// \brief Determine whether the given header is part of a module
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/// marked 'unavailable'.
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bool isHeaderInUnavailableModule(const FileEntry *Header) const;
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/// \brief Determine whether the given header is unavailable as part
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/// of the specified module.
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bool isHeaderUnavailableInModule(const FileEntry *Header,
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const Module *RequestingModule) const;
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/// \brief Retrieve a module with the given name.
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///
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/// \param Name The name of the module to look up.
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///
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/// \returns The named module, if known; otherwise, returns null.
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Module *findModule(StringRef Name) const;
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/// \brief Retrieve a module with the given name using lexical name lookup,
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/// starting at the given context.
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///
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/// \param Name The name of the module to look up.
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///
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/// \param Context The module context, from which we will perform lexical
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/// name lookup.
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///
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/// \returns The named module, if known; otherwise, returns null.
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Module *lookupModuleUnqualified(StringRef Name, Module *Context) const;
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/// \brief Retrieve a module with the given name within the given context,
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/// using direct (qualified) name lookup.
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///
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/// \param Name The name of the module to look up.
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///
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/// \param Context The module for which we will look for a submodule. If
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/// null, we will look for a top-level module.
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///
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/// \returns The named submodule, if known; otherwose, returns null.
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Module *lookupModuleQualified(StringRef Name, Module *Context) const;
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/// \brief Find a new module or submodule, or create it if it does not already
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/// exist.
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///
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/// \param Name The name of the module to find or create.
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///
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/// \param Parent The module that will act as the parent of this submodule,
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/// or NULL to indicate that this is a top-level module.
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///
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/// \param IsFramework Whether this is a framework module.
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///
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/// \param IsExplicit Whether this is an explicit submodule.
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///
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/// \returns The found or newly-created module, along with a boolean value
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/// that will be true if the module is newly-created.
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std::pair<Module *, bool> findOrCreateModule(StringRef Name, Module *Parent,
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bool IsFramework,
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bool IsExplicit);
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/// \brief Create a new module for a C++ Modules TS module interface unit.
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/// The module must not already exist, and will be configured for the current
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/// compilation.
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///
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/// Note that this also sets the current module to the newly-created module.
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///
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/// \returns The newly-created module.
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Module *createModuleForInterfaceUnit(SourceLocation Loc, StringRef Name);
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/// \brief Infer the contents of a framework module map from the given
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/// framework directory.
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Module *inferFrameworkModule(const DirectoryEntry *FrameworkDir,
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bool IsSystem, Module *Parent);
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/// \brief Retrieve the module map file containing the definition of the given
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/// module.
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///
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/// \param Module The module whose module map file will be returned, if known.
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///
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/// \returns The file entry for the module map file containing the given
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/// module, or NULL if the module definition was inferred.
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const FileEntry *getContainingModuleMapFile(const Module *Module) const;
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/// \brief Get the module map file that (along with the module name) uniquely
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/// identifies this module.
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///
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/// The particular module that \c Name refers to may depend on how the module
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/// was found in header search. However, the combination of \c Name and
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/// this module map will be globally unique for top-level modules. In the case
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/// of inferred modules, returns the module map that allowed the inference
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/// (e.g. contained 'module *'). Otherwise, returns
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/// getContainingModuleMapFile().
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const FileEntry *getModuleMapFileForUniquing(const Module *M) const;
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void setInferredModuleAllowedBy(Module *M, const FileEntry *ModuleMap);
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/// \brief Get any module map files other than getModuleMapFileForUniquing(M)
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/// that define submodules of a top-level module \p M. This is cheaper than
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/// getting the module map file for each submodule individually, since the
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/// expected number of results is very small.
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AdditionalModMapsSet *getAdditionalModuleMapFiles(const Module *M) {
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auto I = AdditionalModMaps.find(M);
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if (I == AdditionalModMaps.end())
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return nullptr;
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return &I->second;
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}
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void addAdditionalModuleMapFile(const Module *M, const FileEntry *ModuleMap) {
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AdditionalModMaps[M].insert(ModuleMap);
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}
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/// \brief Resolve all of the unresolved exports in the given module.
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///
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/// \param Mod The module whose exports should be resolved.
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///
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/// \param Complain Whether to emit diagnostics for failures.
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///
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/// \returns true if any errors were encountered while resolving exports,
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/// false otherwise.
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bool resolveExports(Module *Mod, bool Complain);
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/// \brief Resolve all of the unresolved uses in the given module.
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///
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/// \param Mod The module whose uses should be resolved.
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///
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/// \param Complain Whether to emit diagnostics for failures.
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///
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/// \returns true if any errors were encountered while resolving uses,
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/// false otherwise.
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bool resolveUses(Module *Mod, bool Complain);
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/// \brief Resolve all of the unresolved conflicts in the given module.
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///
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/// \param Mod The module whose conflicts should be resolved.
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///
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/// \param Complain Whether to emit diagnostics for failures.
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///
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/// \returns true if any errors were encountered while resolving conflicts,
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/// false otherwise.
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bool resolveConflicts(Module *Mod, bool Complain);
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/// \brief Infers the (sub)module based on the given source location and
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/// source manager.
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///
|
|
/// \param Loc The location within the source that we are querying, along
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|
/// with its source manager.
|
|
///
|
|
/// \returns The module that owns this source location, or null if no
|
|
/// module owns this source location.
|
|
Module *inferModuleFromLocation(FullSourceLoc Loc);
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|
|
|
/// \brief Sets the umbrella header of the given module to the given
|
|
/// header.
|
|
void setUmbrellaHeader(Module *Mod, const FileEntry *UmbrellaHeader,
|
|
Twine NameAsWritten);
|
|
|
|
/// \brief Sets the umbrella directory of the given module to the given
|
|
/// directory.
|
|
void setUmbrellaDir(Module *Mod, const DirectoryEntry *UmbrellaDir,
|
|
Twine NameAsWritten);
|
|
|
|
/// \brief Adds this header to the given module.
|
|
/// \param Role The role of the header wrt the module.
|
|
void addHeader(Module *Mod, Module::Header Header,
|
|
ModuleHeaderRole Role, bool Imported = false);
|
|
|
|
/// \brief Marks this header as being excluded from the given module.
|
|
void excludeHeader(Module *Mod, Module::Header Header);
|
|
|
|
/// \brief Parse the given module map file, and record any modules we
|
|
/// encounter.
|
|
///
|
|
/// \param File The file to be parsed.
|
|
///
|
|
/// \param IsSystem Whether this module map file is in a system header
|
|
/// directory, and therefore should be considered a system module.
|
|
///
|
|
/// \param HomeDir The directory in which relative paths within this module
|
|
/// map file will be resolved.
|
|
///
|
|
/// \param ExternModuleLoc The location of the "extern module" declaration
|
|
/// that caused us to load this module map file, if any.
|
|
///
|
|
/// \returns true if an error occurred, false otherwise.
|
|
bool parseModuleMapFile(const FileEntry *File, bool IsSystem,
|
|
const DirectoryEntry *HomeDir,
|
|
SourceLocation ExternModuleLoc = SourceLocation());
|
|
|
|
/// \brief Dump the contents of the module map, for debugging purposes.
|
|
void dump();
|
|
|
|
typedef llvm::StringMap<Module *>::const_iterator module_iterator;
|
|
module_iterator module_begin() const { return Modules.begin(); }
|
|
module_iterator module_end() const { return Modules.end(); }
|
|
};
|
|
|
|
} // end namespace clang
|
|
|
|
#endif // LLVM_CLANG_LEX_MODULEMAP_H
|