lib/CompilerDriver/Action.cpp

   1 //===--- Action.cpp - The LLVM Compiler Driver ------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open
   6 // Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  Action class - implementation and auxiliary functions.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CompilerDriver/Action.h"
  15
  16 #include "llvm/Support/CommandLine.h"
  17 #include "llvm/System/Program.h"
  18
  19 #include <iostream>
  20 #include <stdexcept>
  21
  22 using namespace llvm;
  23 using namespace llvmc;
  24
  25 extern cl::opt<bool> DryRun;
  26 extern cl::opt<bool> VerboseMode;
  27
  28 namespace {
  29   int ExecuteProgram(const std::string& name,
  30                      const StrVector& args) {
  31     sys::Path prog = sys::Program::FindProgramByName(name);
  32
  33     if (prog.isEmpty())
  34       throw std::runtime_error("Can't find program '" + name + "'");
  35     if (!prog.canExecute())
  36       throw std::runtime_error("Program '" + name + "' is not executable.");
  37
  38     // Build the command line vector and the redirects array.
  39     const sys::Path* redirects[3] = {0,0,0};
  40     sys::Path stdout_redirect;
  41
  42     std::vector<const char*> argv;
  43     argv.reserve((args.size()+2));
  44     argv.push_back(name.c_str());
  45
  46     for (StrVector::const_iterator B = args.begin(), E = args.end();
  47          B!=E; ++B) {
  48       if (*B == ">") {
  49         ++B;
  50         stdout_redirect.set(*B);
  51         redirects[1] = &stdout_redirect;
  52       }
  53       else {
  54         argv.push_back((*B).c_str());
  55       }
  56     }
  57     argv.push_back(0);  // null terminate list.
  58
  59     // Invoke the program.
  60     return sys::Program::ExecuteAndWait(prog, &argv[0], 0, &redirects[0]);
  61   }
  62
  63   void print_string (const std::string& str) {
  64     std::cerr << str << ' ';
  65   }
  66 }
  67
  68 int llvmc::Action::Execute() const {
  69   if (DryRun || VerboseMode) {
  70     std::cerr << Command_ << " ";
  71     std::for_each(Args_.begin(), Args_.end(), print_string);
  72     std::cerr << '\n';
  73   }
  74   if (DryRun)
  75     return 0;
  76   else
  77     return ExecuteProgram(Command_, Args_);
  78 }