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 #include "llvm/CompilerDriver/BuiltinOptions.h"
  16 #include "llvm/Support/raw_ostream.h"
  17 #include "llvm/System/Program.h"
  18 #include <stdexcept>
  19
  20 using namespace llvm;
  21 using namespace llvmc;
  22
  23 namespace {
  24   int ExecuteProgram(const std::string& name,
  25                      const StrVector& args) {
  26     sys::Path prog = sys::Program::FindProgramByName(name);
  27
  28     if (prog.isEmpty())
  29       throw std::runtime_error("Can't find program '" + name + "'");
  30     if (!prog.canExecute())
  31       throw std::runtime_error("Program '" + name + "' is not executable.");
  32
  33     // Build the command line vector and the redirects array.
  34     const sys::Path* redirects[3] = {0,0,0};
  35     sys::Path stdout_redirect;
  36
  37     std::vector<const char*> argv;
  38     argv.reserve((args.size()+2));
  39     argv.push_back(name.c_str());
  40
  41     for (StrVector::const_iterator B = args.begin(), E = args.end();
  42          B!=E; ++B) {
  43       if (*B == ">") {
  44         ++B;
  45         stdout_redirect.set(*B);
  46         redirects[1] = &stdout_redirect;
  47       }
  48       else {
  49         argv.push_back((*B).c_str());
  50       }
  51     }
  52     argv.push_back(0);  // null terminate list.
  53
  54     // Invoke the program.
  55     return sys::Program::ExecuteAndWait(prog, &argv[0], 0, &redirects[0]);
  56   }
  57
  58   void print_string (const std::string& str) {
  59     errs() << str << ' ';
  60   }
  61 }
  62
  63 int llvmc::Action::Execute() const {
  64   if (DryRun || VerboseMode) {
  65     errs() << Command_ << " ";
  66     std::for_each(Args_.begin(), Args_.end(), print_string);
  67     errs() << '\n';
  68   }
  69   if (DryRun)
  70     return 0;
  71   else
  72     return ExecuteProgram(Command_, Args_);
  73 }