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//===--- DirectoryLookup.h - Info for searching for headers -----*- C++ -*-===//
//
// 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 defines the DirectoryLookup interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LEX_DIRECTORYLOOKUP_H
#define LLVM_CLANG_LEX_DIRECTORYLOOKUP_H
#include "clang/Basic/LLVM.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/ModuleMap.h"
namespace clang {
class HeaderMap;
class HeaderSearch;
class Module;
/// DirectoryLookup - This class represents one entry in the search list that
/// specifies the search order for directories in \#include directives. It
/// represents either a directory, a framework, or a headermap.
///
class DirectoryLookup {
public:
enum LookupType_t {
LT_NormalDir,
LT_Framework,
LT_HeaderMap
};
private:
union DLU { // This union is discriminated by isHeaderMap.
/// Dir - This is the actual directory that we're referring to for a normal
/// directory or a framework.
DirectoryEntryRef Dir;
/// Map - This is the HeaderMap if this is a headermap lookup.
///
const HeaderMap *Map;
DLU(DirectoryEntryRef Dir) : Dir(Dir) {}
DLU(const HeaderMap *Map) : Map(Map) {}
} u;
/// DirCharacteristic - The type of directory this is: this is an instance of
/// SrcMgr::CharacteristicKind.
LLVM_PREFERRED_TYPE(SrcMgr::CharacteristicKind)
unsigned DirCharacteristic : 3;
/// LookupType - This indicates whether this DirectoryLookup object is a
/// normal directory, a framework, or a headermap.
LLVM_PREFERRED_TYPE(LookupType_t)
unsigned LookupType : 2;
/// Whether this is a header map used when building a framework.
LLVM_PREFERRED_TYPE(bool)
unsigned IsIndexHeaderMap : 1;
/// Whether we've performed an exhaustive search for module maps
/// within the subdirectories of this directory.
LLVM_PREFERRED_TYPE(bool)
unsigned SearchedAllModuleMaps : 1;
public:
/// This ctor *does not take ownership* of 'Dir'.
DirectoryLookup(DirectoryEntryRef Dir, SrcMgr::CharacteristicKind DT,
bool isFramework)
: u(Dir), DirCharacteristic(DT),
LookupType(isFramework ? LT_Framework : LT_NormalDir),
IsIndexHeaderMap(false), SearchedAllModuleMaps(false) {}
/// This ctor *does not take ownership* of 'Map'.
DirectoryLookup(const HeaderMap *Map, SrcMgr::CharacteristicKind DT,
bool isIndexHeaderMap)
: u(Map), DirCharacteristic(DT), LookupType(LT_HeaderMap),
IsIndexHeaderMap(isIndexHeaderMap), SearchedAllModuleMaps(false) {}
/// getLookupType - Return the kind of directory lookup that this is: either a
/// normal directory, a framework path, or a HeaderMap.
LookupType_t getLookupType() const { return (LookupType_t)LookupType; }
/// getName - Return the directory or filename corresponding to this lookup
/// object.
StringRef getName() const;
/// getDir - Return the directory that this entry refers to.
///
const DirectoryEntry *getDir() const {
return isNormalDir() ? &u.Dir.getDirEntry() : nullptr;
}
OptionalDirectoryEntryRef getDirRef() const {
return isNormalDir() ? OptionalDirectoryEntryRef(u.Dir) : std::nullopt;
}
/// getFrameworkDir - Return the directory that this framework refers to.
///
const DirectoryEntry *getFrameworkDir() const {
return isFramework() ? &u.Dir.getDirEntry() : nullptr;
}
OptionalDirectoryEntryRef getFrameworkDirRef() const {
return isFramework() ? OptionalDirectoryEntryRef(u.Dir) : std::nullopt;
}
/// getHeaderMap - Return the directory that this entry refers to.
///
const HeaderMap *getHeaderMap() const {
return isHeaderMap() ? u.Map : nullptr;
}
/// isNormalDir - Return true if this is a normal directory, not a header map.
bool isNormalDir() const { return getLookupType() == LT_NormalDir; }
/// isFramework - True if this is a framework directory.
///
bool isFramework() const { return getLookupType() == LT_Framework; }
/// isHeaderMap - Return true if this is a header map, not a normal directory.
bool isHeaderMap() const { return getLookupType() == LT_HeaderMap; }
/// Determine whether we have already searched this entire
/// directory for module maps.
bool haveSearchedAllModuleMaps() const { return SearchedAllModuleMaps; }
/// Specify whether we have already searched all of the subdirectories
/// for module maps.
void setSearchedAllModuleMaps(bool SAMM) {
SearchedAllModuleMaps = SAMM;
}
/// DirCharacteristic - The type of directory this is, one of the DirType enum
/// values.
SrcMgr::CharacteristicKind getDirCharacteristic() const {
return (SrcMgr::CharacteristicKind)DirCharacteristic;
}
/// Whether this describes a system header directory.
bool isSystemHeaderDirectory() const {
return getDirCharacteristic() != SrcMgr::C_User;
}
/// Whether this header map is building a framework or not.
bool isIndexHeaderMap() const {
return isHeaderMap() && IsIndexHeaderMap;
}
/// LookupFile - Lookup the specified file in this search path, returning it
/// if it exists or returning null if not.
///
/// \param Filename The file to look up relative to the search paths.
///
/// \param HS The header search instance to search with.
///
/// \param IncludeLoc the source location of the #include or #import
/// directive.
///
/// \param SearchPath If not NULL, will be set to the search path relative
/// to which the file was found.
///
/// \param RelativePath If not NULL, will be set to the path relative to
/// SearchPath at which the file was found. This only differs from the
/// Filename for framework includes.
///
/// \param RequestingModule The module in which the lookup was performed.
///
/// \param SuggestedModule If non-null, and the file found is semantically
/// part of a known module, this will be set to the module that should
/// be imported instead of preprocessing/parsing the file found.
///
/// \param [out] InUserSpecifiedSystemFramework If the file is found,
/// set to true if the file is located in a framework that has been
/// user-specified to be treated as a system framework.
///
/// \param [out] IsFrameworkFound For a framework directory set to true if
/// specified '.framework' directory is found.
///
/// \param [out] MappedName if this is a headermap which maps the filename to
/// a framework include ("Foo.h" -> "Foo/Foo.h"), set the new name to this
/// vector and point Filename to it.
OptionalFileEntryRef
LookupFile(StringRef &Filename, HeaderSearch &HS, SourceLocation IncludeLoc,
SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule,
bool &InUserSpecifiedSystemFramework, bool &IsFrameworkFound,
bool &IsInHeaderMap, SmallVectorImpl<char> &MappedName,
bool OpenFile = true) const;
private:
OptionalFileEntryRef DoFrameworkLookup(
StringRef Filename, HeaderSearch &HS, SmallVectorImpl<char> *SearchPath,
SmallVectorImpl<char> *RelativePath, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule,
bool &InUserSpecifiedSystemFramework, bool &IsFrameworkFound) const;
};
} // end namespace clang
#endif
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