//===--- HeaderSearchOptions.h ----------------------------------*- C++ -*-===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H

#define LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H

#include "clang/Basic/LLVM.h"

#include "llvm/ADT/IntrusiveRefCntPtr.h"

#include "llvm/ADT/SetVector.h"

#include "llvm/ADT/StringRef.h"

#include <string>

#include <vector>

namespace clang {

namespace frontend {

  /// IncludeDirGroup - Identifiers the group a include entry belongs to, which

  /// represents its relative positive in the search list.  A \#include of a ""

  /// path starts at the -iquote group, then searches the Angled group, then

  /// searches the system group, etc.

  enum IncludeDirGroup {

    Quoted = 0,     ///< '\#include ""' paths, added by 'gcc -iquote'.

    Angled,         ///< Paths for '\#include <>' added by '-I'.

    IndexHeaderMap, ///< Like Angled, but marks header maps used when

                       ///  building frameworks.

    System,         ///< Like Angled, but marks system directories.

    ExternCSystem,  ///< Like System, but headers are implicitly wrapped in

                    ///  extern "C".

    CSystem,        ///< Like System, but only used for C.

    CXXSystem,      ///< Like System, but only used for C++.

    ObjCSystem,     ///< Like System, but only used for ObjC.

    ObjCXXSystem,   ///< Like System, but only used for ObjC++.

    After           ///< Like System, but searched after the system directories.

  };

}

/// HeaderSearchOptions - Helper class for storing options related to the

/// initialization of the HeaderSearch object.

class HeaderSearchOptions : public RefCountedBase<HeaderSearchOptions> {

public:

  struct Entry {

    std::string Path;

    frontend::IncludeDirGroup Group;

    unsigned IsFramework : 1;

    /// IgnoreSysRoot - This is false if an absolute path should be treated

    /// relative to the sysroot, or true if it should always be the absolute

    /// path.

    unsigned IgnoreSysRoot : 1;

    Entry(StringRef path, frontend::IncludeDirGroup group, bool isFramework,

          bool ignoreSysRoot)

      : Path(path), Group(group), IsFramework(isFramework),

        IgnoreSysRoot(ignoreSysRoot) {}

  };

  struct SystemHeaderPrefix {

    /// A prefix to be matched against paths in \#include directives.

    std::string Prefix;

    /// True if paths beginning with this prefix should be treated as system

    /// headers.

    bool IsSystemHeader;

    SystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader)

      : Prefix(Prefix), IsSystemHeader(IsSystemHeader) {}

  };

  /// If non-empty, the directory to use as a "virtual system root" for include

  /// paths.

  std::string Sysroot;

  /// User specified include entries.

  std::vector<Entry> UserEntries;

  /// User-specified system header prefixes.

  std::vector<SystemHeaderPrefix> SystemHeaderPrefixes;

  /// The directory which holds the compiler resource files (builtin includes,

  /// etc.).

  std::string ResourceDir;

  /// \brief The directory used for the module cache.

  std::string ModuleCachePath;

  /// \brief The directory used for a user build.

  std::string ModuleUserBuildPath;

  /// The module/pch container format.

  std::string ModuleFormat;

  /// \brief Whether we should disable the use of the hash string within the

  /// module cache.

  ///

  /// Note: Only used for testing!

  unsigned DisableModuleHash : 1;

  /// \brief Implicit module maps.  This option is enabld by default when

  /// modules is enabled.

  unsigned ImplicitModuleMaps : 1;

  /// \brief Set the 'home directory' of a module map file to the current

  /// working directory (or the home directory of the module map file that

  /// contained the 'extern module' directive importing this module map file

  /// if any) rather than the directory containing the module map file.

  //

  /// The home directory is where we look for files named in the module map

  /// file.

  unsigned ModuleMapFileHomeIsCwd : 1;

  /// \brief The interval (in seconds) between pruning operations.

  ///

  /// This operation is expensive, because it requires Clang to walk through

  /// the directory structure of the module cache, stat()'ing and removing

  /// files.

  ///

  /// The default value is large, e.g., the operation runs once a week.

  unsigned ModuleCachePruneInterval;

  /// \brief The time (in seconds) after which an unused module file will be

  /// considered unused and will, therefore, be pruned.

  ///

  /// When the module cache is pruned, any module file that has not been

  /// accessed in this many seconds will be removed. The default value is

  /// large, e.g., a month, to avoid forcing infrequently-used modules to be

  /// regenerated often.

  unsigned ModuleCachePruneAfter;

  /// \brief The time in seconds when the build session started.

  ///

  /// This time is used by other optimizations in header search and module

  /// loading.

  uint64_t BuildSessionTimestamp;

  /// \brief The set of macro names that should be ignored for the purposes

  /// of computing the module hash.

  llvm::SetVector<std::string> ModulesIgnoreMacros;

  /// \brief The set of user-provided virtual filesystem overlay files.

  std::vector<std::string> VFSOverlayFiles;

  /// Include the compiler builtin includes.

  unsigned UseBuiltinIncludes : 1;

  /// Include the system standard include search directories.

  unsigned UseStandardSystemIncludes : 1;

  /// Include the system standard C++ library include search directories.

  unsigned UseStandardCXXIncludes : 1;

  /// Use libc++ instead of the default libstdc++.

  unsigned UseLibcxx : 1;

  /// Whether header search information should be output as for -v.

  unsigned Verbose : 1;

  /// \brief If true, skip verifying input files used by modules if the

  /// module was already verified during this build session (see

  /// \c BuildSessionTimestamp).

  unsigned ModulesValidateOncePerBuildSession : 1;

  /// \brief Whether to validate system input files when a module is loaded.

  unsigned ModulesValidateSystemHeaders : 1;

public:

  HeaderSearchOptions(StringRef _Sysroot = "/")

      : Sysroot(_Sysroot), ModuleFormat("raw"), DisableModuleHash(0),

        ImplicitModuleMaps(0), ModuleMapFileHomeIsCwd(0),

        ModuleCachePruneInterval(7 * 24 * 60 * 60),

        ModuleCachePruneAfter(31 * 24 * 60 * 60), BuildSessionTimestamp(0),

        UseBuiltinIncludes(true), UseStandardSystemIncludes(true),

        UseStandardCXXIncludes(true), UseLibcxx(false), Verbose(false),

        ModulesValidateOncePerBuildSession(false),

        ModulesValidateSystemHeaders(false) {}

  /// AddPath - Add the \p Path path to the specified \p Group list.

  void AddPath(StringRef Path, frontend::IncludeDirGroup Group,

               bool IsFramework, bool IgnoreSysRoot) {

    UserEntries.emplace_back(Path, Group, IsFramework, IgnoreSysRoot);

  }

  /// AddSystemHeaderPrefix - Override whether \#include directives naming a

  /// path starting with \p Prefix should be considered as naming a system

  /// header.

  void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {

    SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);

  }

  void AddVFSOverlayFile(StringRef Name) {

    VFSOverlayFiles.push_back(Name);

  }

};

} // end namespace clang

#endif