lib/CompilerDriver/Main.cpp

   1 //===--- Main.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 //  llvmc::Main function - driver entry point.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CompilerDriver/BuiltinOptions.h"
  15 #include "llvm/CompilerDriver/CompilationGraph.h"
  16 #include "llvm/CompilerDriver/Error.h"
  17 #include "llvm/CompilerDriver/Plugin.h"
  18
  19 #include "llvm/Support/raw_ostream.h"
  20 #include "llvm/System/Path.h"
  21
  22 #include <stdexcept>
  23 #include <string>
  24
  25 namespace cl = llvm::cl;
  26 namespace sys = llvm::sys;
  27 using namespace llvmc;
  28
  29 namespace {
  30
  31   sys::Path getTempDir() {
  32     sys::Path tempDir;
  33
  34     // The --temp-dir option.
  35     if (!TempDirname.empty()) {
  36       tempDir = TempDirname;
  37     }
  38     // GCC 4.5-style -save-temps handling.
  39     else if (SaveTemps == SaveTempsEnum::Unset) {
  40       tempDir = sys::Path::GetTemporaryDirectory();
  41       return tempDir;
  42     }
  43     else if (SaveTemps == SaveTempsEnum::Obj && !OutputFilename.empty()) {
  44       tempDir = OutputFilename;
  45       tempDir = tempDir.getDirname();
  46     }
  47     else {
  48       // SaveTemps == Cwd --> use current dir (leave tempDir empty).
  49       return tempDir;
  50     }
  51
  52     if (!tempDir.exists()) {
  53       std::string ErrMsg;
  54       if (tempDir.createDirectoryOnDisk(true, &ErrMsg))
  55         throw std::runtime_error(ErrMsg);
  56     }
  57
  58     return tempDir;
  59   }
  60
  61   /// BuildTargets - A small wrapper for CompilationGraph::Build.
  62   int BuildTargets(CompilationGraph& graph, const LanguageMap& langMap) {
  63     int ret;
  64     const sys::Path& tempDir = getTempDir();
  65     bool toDelete = (SaveTemps == SaveTempsEnum::Unset);
  66
  67     try {
  68       ret = graph.Build(tempDir, langMap);
  69     }
  70     catch(...) {
  71       if (toDelete)
  72         tempDir.eraseFromDisk(true);
  73       throw;
  74     }
  75
  76     if (toDelete)
  77       tempDir.eraseFromDisk(true);
  78     return ret;
  79   }
  80 }
  81
  82 namespace llvmc {
  83
  84 // Sometimes plugins want to condition on the value in argv[0].
  85 const char* ProgramName;
  86
  87 int Main(int argc, char** argv) {
  88   try {
  89     LanguageMap langMap;
  90     CompilationGraph graph;
  91
  92     ProgramName = argv[0];
  93
  94     cl::ParseCommandLineOptions
  95       (argc, argv, "LLVM Compiler Driver (Work In Progress)", true);
  96
  97     PluginLoader Plugins;
  98     Plugins.PopulateLanguageMap(langMap);
  99     Plugins.PopulateCompilationGraph(graph);
 100
 101     if (CheckGraph) {
 102       int ret = graph.Check();
 103       if (!ret)
 104         llvm::errs() << "check-graph: no errors found.\n";
 105
 106       return ret;
 107     }
 108
 109     if (ViewGraph) {
 110       graph.viewGraph();
 111       if (!WriteGraph)
 112         return 0;
 113     }
 114
 115     if (WriteGraph) {
 116       graph.writeGraph(OutputFilename.empty()
 117                        ? std::string("compilation-graph.dot")
 118                        : OutputFilename);
 119       return 0;
 120     }
 121
 122     if (InputFilenames.empty()) {
 123       throw std::runtime_error("no input files");
 124     }
 125
 126     return BuildTargets(graph, langMap);
 127   }
 128   catch(llvmc::error_code& ec) {
 129     return ec.code();
 130   }
 131   catch(const std::exception& ex) {
 132     llvm::errs() << argv[0] << ": " << ex.what() << '\n';
 133   }
 134   catch(...) {
 135     llvm::errs() << argv[0] << ": unknown error!\n";
 136   }
 137   return 1;
 138 }
 139
 140 } // end namespace llvmc