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//===--- DirectoryLookup.h - Info for searching for headers -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the DirectoryLookup interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LEX_DIRECTORYLOOKUP_H
#define LLVM_CLANG_LEX_DIRECTORYLOOKUP_H
namespace clang {
class DirectoryEntry;
class HeaderMap;
/// 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 or a 'headermap'. A headermap is just like a
/// directory, but it remaps its contents through an indirection table instead
/// of indexing a directory.
class DirectoryLookup {
public:
enum DirType {
NormalHeaderDir,
SystemHeaderDir,
ExternCSystemHeaderDir
};
private:
union { // This union is discriminated by isHeaderMap.
/// Dir - This is the actual directory that we're referring to.
///
const DirectoryEntry *Dir;
/// Map - This is the HeaderMap corresponding if the isHeaderMap field is
/// true.
const HeaderMap *Map;
} u;
/// DirCharacteristic - The type of directory this is, one of the DirType enum
/// values.
DirType DirCharacteristic : 2;
/// UserSupplied - True if this is a user-supplied directory.
///
bool UserSupplied : 1;
/// Framework - True if this is a framework directory search-path.
///
bool Framework : 1;
/// isHeaderMap - True if the HeaderMap field is valid, false if the Dir field
/// is valid.
bool isHeaderMap : 1;
public:
/// DirectoryLookup ctor - Note that this ctor *does not take ownership* of
/// 'dir'.
DirectoryLookup(const DirectoryEntry *dir, DirType DT, bool isUser,
bool isFramework)
: DirCharacteristic(DT), UserSupplied(isUser),
Framework(isFramework), isHeaderMap(false) {
u.Dir = dir;
}
/// DirectoryLookup ctor - Note that this ctor *does not take ownership* of
/// 'map'.
DirectoryLookup(const HeaderMap *map, DirType DT, bool isUser, bool isFWork)
: DirCharacteristic(DT), UserSupplied(isUser), Framework(isFWork),
isHeaderMap(true) {
u.Map = map;
}
/// getDir - Return the directory that this entry refers to.
///
const DirectoryEntry *getDir() const { return !isHeaderMap ? u.Dir : 0; }
/// getHeaderMap - Return the directory that this entry refers to.
///
const HeaderMap *getHeaderMap() const { return isHeaderMap ? u.Map : 0; }
/// DirCharacteristic - The type of directory this is, one of the DirType enum
/// values.
DirType getDirCharacteristic() const { return DirCharacteristic; }
/// isUserSupplied - True if this is a user-supplied directory.
///
bool isUserSupplied() const { return UserSupplied; }
/// isFramework - True if this is a framework directory.
///
bool isFramework() const { return Framework; }
};
} // end namespace clang
#endif
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