//===- Multilib.cpp - Multilib Implementation -----------------------------===//

//

// 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

//

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

#include "clang/Driver/Multilib.h"

#include "clang/Basic/LLVM.h"

#include "clang/Basic/Version.h"

#include "llvm/ADT/SmallString.h"

#include "llvm/ADT/StringMap.h"

#include "llvm/ADT/StringRef.h"

#include "llvm/Support/Compiler.h"

#include "llvm/Support/Error.h"

#include "llvm/Support/ErrorHandling.h"

#include "llvm/Support/Path.h"

#include "llvm/Support/Regex.h"

#include "llvm/Support/VersionTuple.h"

#include "llvm/Support/YAMLParser.h"

#include "llvm/Support/YAMLTraits.h"

#include "llvm/Support/raw_ostream.h"

#include <algorithm>

#include <cassert>

#include <string>

using namespace clang;

using namespace driver;

using namespace llvm::sys;

Multilib::Multilib(StringRef GCCSuffix, StringRef OSSuffix,

                   StringRef IncludeSuffix, const flags_list &Flags)

    : GCCSuffix(GCCSuffix), OSSuffix(OSSuffix), IncludeSuffix(IncludeSuffix),

      Flags(Flags) {

  assert(GCCSuffix.empty() ||

         (StringRef(GCCSuffix).front() == '/' && GCCSuffix.size() > 1));

  assert(OSSuffix.empty() ||

         (StringRef(OSSuffix).front() == '/' && OSSuffix.size() > 1));

  assert(IncludeSuffix.empty() ||

         (StringRef(IncludeSuffix).front() == '/' && IncludeSuffix.size() > 1));

}

LLVM_DUMP_METHOD void Multilib::dump() const {

  print(llvm::errs());

}

void Multilib::print(raw_ostream &OS) const {

  if (GCCSuffix.empty())

    OS << ".";

  else {

    OS << StringRef(GCCSuffix).drop_front();

  }

  OS << ";";

  for (StringRef Flag : Flags) {

    if (Flag.front() == '-')

      OS << "@" << Flag.substr(1);

  }

}

bool Multilib::operator==(const Multilib &Other) const {

  // Check whether the flags sets match

  // allowing for the match to be order invariant

  llvm::StringSet<> MyFlags;

  for (const auto &Flag : Flags)

    MyFlags.insert(Flag);

  for (const auto &Flag : Other.Flags)

    if (!MyFlags.contains(Flag))

      return false;

  if (osSuffix() != Other.osSuffix())

    return false;

  if (gccSuffix() != Other.gccSuffix())

    return false;

  if (includeSuffix() != Other.includeSuffix())

    return false;

  return true;

}

raw_ostream &clang::driver::operator<<(raw_ostream &OS, const Multilib &M) {

  M.print(OS);

  return OS;

}

MultilibSet &MultilibSet::FilterOut(FilterCallback F) {

  llvm::erase_if(Multilibs, F);

  return *this;

}

void MultilibSet::push_back(const Multilib &M) { Multilibs.push_back(M); }

bool MultilibSet::select(const Multilib::flags_list &Flags,

                         llvm::SmallVector<Multilib> &Selected) const {

  llvm::StringSet<> FlagSet(expandFlags(Flags));

  Selected.clear();

  llvm::copy_if(Multilibs, std::back_inserter(Selected),

                [&FlagSet](const Multilib &M) {

                  for (const std::string &F : M.flags())

                    if (!FlagSet.contains(F))

                      return false;

                  return true;

                });

  return !Selected.empty();

}

llvm::StringSet<>

MultilibSet::expandFlags(const Multilib::flags_list &InFlags) const {

  llvm::StringSet<> Result;

  for (const auto &F : InFlags)

    Result.insert(F);

  for (const FlagMatcher &M : FlagMatchers) {

    std::string RegexString(M.Match);

    // Make the regular expression match the whole string.

    if (!StringRef(M.Match).starts_with("^"))

      RegexString.insert(RegexString.begin(), '^');

    if (!StringRef(M.Match).ends_with("$"))

      RegexString.push_back('$');

    const llvm::Regex Regex(RegexString);

    assert(Regex.isValid());

    
if (86
llvm::find_if(InFlags, [&Regex](StringRef F) 86
{

          return Regex.match(F);

        }) != InFlags.end()) {

      Result.insert(M.Flags.begin(), M.Flags.end());

    }

  }

  return Result;

}

namespace {

// When updating this also update MULTILIB_VERSION in MultilibTest.cpp

static const VersionTuple MultilibVersionCurrent(1, 0);

struct MultilibSerialization {

  std::string Dir;

  std::vector<std::string> Flags;

};

struct MultilibSetSerialization {

  llvm::VersionTuple MultilibVersion;

  std::vector<MultilibSerialization> Multilibs;

  std::vector<MultilibSet::FlagMatcher> FlagMatchers;

};

} // end anonymous namespace

template <> struct llvm::yaml::MappingTraits<MultilibSerialization> {

  static void mapping(llvm::yaml::IO &io, MultilibSerialization &V) {

    io.mapRequired("Dir", V.Dir);

    io.mapRequired("Flags", V.Flags);

  }

  static std::string validate(IO &io, MultilibSerialization &V) {

    if (StringRef(V.Dir).starts_with("/"))

      return "paths must be relative but \"" + V.Dir + "\" starts with \"/\"";

    return std::string{};

  }

};

template <> struct llvm::yaml::MappingTraits<MultilibSet::FlagMatcher> {

  static void mapping(llvm::yaml::IO &io, MultilibSet::FlagMatcher &M) {

    io.mapRequired("Match", M.Match);

    io.mapRequired("Flags", M.Flags);

  }

  static std::string validate(IO &io, MultilibSet::FlagMatcher &M) {

    llvm::Regex Regex(M.Match);

    std::string RegexError;

    if (!Regex.isValid(RegexError))

      return RegexError;

    if (M.Flags.empty())

      return "value required for 'Flags'";

    return std::string{};

  }

};

template <> struct llvm::yaml::MappingTraits<MultilibSetSerialization> {

  static void mapping(llvm::yaml::IO &io, MultilibSetSerialization &M) {

    io.mapRequired("MultilibVersion", M.MultilibVersion);

    io.mapRequired("Variants", M.Multilibs);

    io.mapOptional("Mappings", M.FlagMatchers);

  }

  static std::string validate(IO &io, MultilibSetSerialization &M) {

    if (M.MultilibVersion.empty())

      return "missing required key 'MultilibVersion'";

    if (M.MultilibVersion.getMajor() != MultilibVersionCurrent.getMajor())

      return "multilib version " + M.MultilibVersion.getAsString() +

             " is unsupported";

    if (M.MultilibVersion.getMinor() > MultilibVersionCurrent.getMinor())

      return "multilib version " + M.MultilibVersion.getAsString() +

             " is unsupported";

    return std::string{};

  }

};

LLVM_YAML_IS_SEQUENCE_VECTOR(MultilibSerialization)

LLVM_YAML_IS_SEQUENCE_VECTOR(MultilibSet::FlagMatcher)

llvm::ErrorOr<MultilibSet>

MultilibSet::parseYaml(llvm::MemoryBufferRef Input,

                       llvm::SourceMgr::DiagHandlerTy DiagHandler,

                       void *DiagHandlerCtxt) {

  MultilibSetSerialization MS;

  llvm::yaml::Input YamlInput(Input, nullptr, DiagHandler, DiagHandlerCtxt);

  YamlInput >> MS;

  if (YamlInput.error())

    return YamlInput.error();

  multilib_list Multilibs;

  Multilibs.reserve(MS.Multilibs.size());

  for (const auto &M : MS.Multilibs) {

    std::string Dir;

    if (M.Dir != ".")

      Dir = "/" + M.Dir;

    Multilibs.emplace_back(Dir, Dir, Dir, M.Flags);

  }

  return MultilibSet(std::move(Multilibs), std::move(MS.FlagMatchers));

}

LLVM_DUMP_METHOD void MultilibSet::dump() const {

  print(llvm::errs());

}

void MultilibSet::print(raw_ostream &OS) const {

  for (const auto &M : *this)

    OS << M << "\n";

}

raw_ostream &clang::driver::operator<<(raw_ostream &OS, const MultilibSet &MS) {

  MS.print(OS);

  return OS;

}