//===- HeaderSearchOptions.h ------------------------------------*- 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

//

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

#ifndef LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H

#define LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H

#include "clang/Basic/LLVM.h"

#include "llvm/ADT/CachedHashString.h"

#include "llvm/ADT/Hashing.h"

#include "llvm/ADT/SetVector.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/Support/HashBuilder.h"

#include <cstdint>

#include <map>

#include <string>

#include <vector>

namespace clang {

namespace frontend {

/// IncludeDirGroup - Identifies the group an include Entry belongs to,

/// representing its relative positive in the search list.

/// \#include directives whose paths are enclosed by string quotes ("")

/// start searching at the Quoted group (specified by '-iquote'),

/// then search the Angled group, then the System group, etc.

enum IncludeDirGroup {

  /// '\#include ""' paths, added by 'gcc -iquote'.

  Quoted = 0,

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

  Angled,

  /// Like Angled, but marks header maps used when building frameworks.

  IndexHeaderMap,

  /// Like Angled, but marks system directories.

  System,

  /// Like System, but headers are implicitly wrapped in extern "C".

  ExternCSystem,

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

  CSystem,

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

  CXXSystem,

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

  ObjCSystem,

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

  ObjCXXSystem,

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

  After

};

} // namespace frontend

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

/// initialization of the HeaderSearch object.

class 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;

  /// The directory used for the module cache.

  std::string ModuleCachePath;

  /// The directory used for a user build.

  std::string ModuleUserBuildPath;

  /// The mapping of module names to prebuilt module files.

  std::map<std::string, std::string, std::less<>> PrebuiltModuleFiles;

  /// The directories used to load prebuilt module files.

  std::vector<std::string> PrebuiltModulePaths;

  /// The module/pch container format.

  std::string ModuleFormat;

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

  /// module cache.

  ///

  /// Note: Only used for testing!

  unsigned DisableModuleHash : 1;

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

  /// modules is enabled.

  unsigned ImplicitModuleMaps : 1;

  /// 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;

  /// Also search for prebuilt implicit modules in the prebuilt module cache

  /// path.

  unsigned EnablePrebuiltImplicitModules : 1;

  /// 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 = 7 * 24 * 60 * 60;

  /// 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 = 31 * 24 * 60 * 60;

  /// 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 = 0;

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

  /// of computing the module hash.

  llvm::SmallSetVector<llvm::CachedHashString, 16> ModulesIgnoreMacros;

  /// 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;

  /// 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;

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

  unsigned ModulesValidateSystemHeaders : 1;

  // Whether the content of input files should be hashed and used to

  // validate consistency.

  unsigned ValidateASTInputFilesContent : 1;

  /// Whether the module includes debug information (-gmodules).

  unsigned UseDebugInfo : 1;

  unsigned ModulesValidateDiagnosticOptions : 1;

  unsigned ModulesHashContent : 1;

  /// Whether we should include all things that could impact the module in the

  /// hash.

  ///

  /// This includes things like the full header search path, and enabled

  /// diagnostics.

  unsigned ModulesStrictContextHash : 1;

  HeaderSearchOptions(StringRef _Sysroot = "/")

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

        ImplicitModuleMaps(false), ModuleMapFileHomeIsCwd(false),

        EnablePrebuiltImplicitModules(false), UseBuiltinIncludes(true),

        UseStandardSystemIncludes(true), UseStandardCXXIncludes(true),

        UseLibcxx(false), Verbose(false),

        ModulesValidateOncePerBuildSession(false),

        ModulesValidateSystemHeaders(false),

        ValidateASTInputFilesContent(false), UseDebugInfo(false),

        ModulesValidateDiagnosticOptions(true), ModulesHashContent(false),

        ModulesStrictContextHash(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(std::string(Name));

  }

  void AddPrebuiltModulePath(StringRef Name) {

    PrebuiltModulePaths.push_back(std::string(Name));

  }

};

inline llvm::hash_code hash_value(const HeaderSearchOptions::Entry &E) {

  return llvm::hash_combine(E.Path, E.Group, E.IsFramework, E.IgnoreSysRoot);

}

template <typename HasherT, llvm::support::endianness Endianness>

inline void addHash(llvm::HashBuilderImpl<HasherT, Endianness> &HBuilder,

                    const HeaderSearchOptions::Entry &E) {

  HBuilder.add(E.Path, E.Group, E.IsFramework, E.IgnoreSysRoot);

}

inline llvm::hash_code

hash_value(const HeaderSearchOptions::SystemHeaderPrefix &SHP) {

  return llvm::hash_combine(SHP.Prefix, SHP.IsSystemHeader);

}

template <typename HasherT, llvm::support::endianness Endianness>

inline void addHash(llvm::HashBuilderImpl<HasherT, Endianness> &HBuilder,

                    const HeaderSearchOptions::SystemHeaderPrefix &SHP) {

  HBuilder.add(SHP.Prefix, SHP.IsSystemHeader);

}

} // namespace clang

#endif // LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H