//===--- Tools.h - 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.
//
//===----------------------------------------------------------------------===//
//
//  Action class - implementation and auxiliary functions.
//
//===----------------------------------------------------------------------===//

#include "Action.h"

#include "llvm/Support/CommandLine.h"
#include "llvm/System/Program.h"

#include <iostream>
#include <stdexcept>

using namespace llvm;

extern cl::opt<bool> VerboseMode;

namespace {
  int ExecuteProgram(const std::string& name,
                     const std::vector<std::string>& args) {
    sys::Path prog = sys::Program::FindProgramByName(name);

    if (prog.isEmpty())
      throw std::runtime_error("Can't find program '" + name + "'");
    if (!prog.canExecute())
      throw std::runtime_error("Program '" + name + "' is not executable.");

    // Invoke the program
    std::vector<const char*> argv((args.size()+2));
    argv[0] = name.c_str();
    for (unsigned i = 1; i <= args.size(); ++i)
      argv[i] = args[i-1].c_str();
    argv[args.size()+1] = 0;  // null terminate list.

    return sys::Program::ExecuteAndWait(prog, &argv[0]);
  }

  void print_string (const std::string& str) {
    std::cerr << str << ' ';
  }
}

int llvmcc::Action::Execute() const {
  if (VerboseMode) {
    std::cerr << Command_ << " ";
    std::for_each(Args_.begin(), Args_.end(), print_string);
    std::cerr << '\n';
  }
  return ExecuteProgram(Command_, Args_);
}