//===--- Tool.cpp - The LLVM Compiler Driver --------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open
// Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  Tool base class - implementation details.
//
//===----------------------------------------------------------------------===//

#include "llvm/CompilerDriver/BuiltinOptions.h"
#include "llvm/CompilerDriver/Tool.h"

#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Path.h"

#include <algorithm>

using namespace llvm;
using namespace llvmc;

namespace {
  sys::Path MakeTempFile(const sys::Path& TempDir, const std::string& BaseName,
                         const std::string& Suffix) {
    sys::Path Out;

    // Make sure we don't end up with path names like '/file.o' if the
    // TempDir is empty.
    if (TempDir.empty()) {
      Out.set(BaseName);
    }
    else {
      Out = TempDir;
      Out.appendComponent(BaseName);
    }
    Out.appendSuffix(Suffix);
    // NOTE: makeUnique always *creates* a unique temporary file,
    // which is good, since there will be no races. However, some
    // tools do not like it when the output file already exists, so
    // they need to be placated with -f or something like that.
    Out.makeUnique(true, NULL);
    return Out;
  }
}

sys::Path Tool::OutFilename(const sys::Path& In,
                            const sys::Path& TempDir,
                            bool StopCompilation,
                            const char* OutputSuffix) const {
  sys::Path Out;

  if (StopCompilation) {
    if (!OutputFilename.empty()) {
      Out.set(OutputFilename);
    }
    else if (IsJoin()) {
      Out.set("a");
      Out.appendSuffix(OutputSuffix);
    }
    else {
      Out.set(sys::path::stem(In.str()));
      Out.appendSuffix(OutputSuffix);
    }
  }
  else {
    if (IsJoin())
      Out = MakeTempFile(TempDir, "tmp", OutputSuffix);
    else
      Out = MakeTempFile(TempDir, sys::path::stem(In.str()), OutputSuffix);
  }
  return Out;
}

namespace {
  template <class A, class B>
  bool CompareFirst (std::pair<A,B> p1, std::pair<A,B> p2) {
    return std::less<A>()(p1.first, p2.first);
  }
}

StrVector Tool::SortArgs(ArgsVector& Args) const {
  StrVector Out;

  // HACK: this won't be needed when we'll migrate away from CommandLine.
  std::stable_sort(Args.begin(), Args.end(),
                   &CompareFirst<unsigned, std::string>);
  for (ArgsVector::iterator B = Args.begin(), E = Args.end(); B != E; ++B) {
    Out.push_back(B->second);
  }

  return Out;
}
