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/AutoGenerated.h"
  15 #include "llvm/CompilerDriver/BuiltinOptions.h"
  16 #include "llvm/CompilerDriver/CompilationGraph.h"
  17 #include "llvm/CompilerDriver/Error.h"
  18
  19 #include "llvm/Support/FileSystem.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include "llvm/Support/Path.h"
  22
  23 #include <sstream>
  24 #include <string>
  25
  26 namespace cl = llvm::cl;
  27 namespace sys = llvm::sys;
  28 using namespace llvmc;
  29
  30 namespace {
  31
  32   std::stringstream* GlobalTimeLog;
  33
  34   /// GetTempDir - Get the temporary directory location. Returns non-zero value
  35   /// on error.
  36   int GetTempDir(sys::Path& tempDir) {
  37     // The --temp-dir option.
  38     if (!TempDirname.empty()) {
  39       tempDir = TempDirname;
  40     }
  41     // GCC 4.5-style -save-temps handling.
  42     else if (SaveTemps == SaveTempsEnum::Unset) {
  43       tempDir = sys::Path::GetTemporaryDirectory();
  44       return 0;
  45     }
  46     else if (SaveTemps == SaveTempsEnum::Obj && !OutputFilename.empty()) {
  47       tempDir = sys::path::parent_path(OutputFilename);
  48     }
  49     else {
  50       // SaveTemps == Cwd --> use current dir (leave tempDir empty).
  51       return 0;
  52     }
  53
  54     bool Exists;
  55     if (llvm::sys::fs::exists(tempDir.str(), Exists) || !Exists) {
  56       std::string ErrMsg;
  57       if (tempDir.createDirectoryOnDisk(true, &ErrMsg)) {
  58         PrintError(ErrMsg);
  59         return 1;
  60       }
  61     }
  62
  63     return 0;
  64   }
  65
  66   /// BuildTargets - A small wrapper for CompilationGraph::Build. Returns
  67   /// non-zero value in case of error.
  68   int BuildTargets(CompilationGraph& graph, const LanguageMap& langMap) {
  69     int ret;
  70     sys::Path tempDir;
  71     bool toDelete = (SaveTemps == SaveTempsEnum::Unset);
  72
  73     if (int ret = GetTempDir(tempDir))
  74       return ret;
  75
  76     ret = graph.Build(tempDir, langMap);
  77
  78     if (toDelete)
  79       tempDir.eraseFromDisk(true);
  80
  81     return ret;
  82   }
  83 }
  84
  85 namespace llvmc {
  86
  87 // Used to implement -time option. External linkage is intentional.
  88 void AppendToGlobalTimeLog(const std::string& cmd, double time) {
  89   *GlobalTimeLog << "# " << cmd << ' ' << time << '\n';
  90 }
  91
  92 // Sometimes user code wants to access the argv[0] value.
  93 const char* ProgramName;
  94
  95 int Main(int argc, char** argv) {
  96   int ret = 0;
  97   LanguageMap langMap;
  98   CompilationGraph graph;
  99
 100   ProgramName = argv[0];
 101
 102   cl::ParseCommandLineOptions
 103     (argc, argv,
 104      /* Overview = */ "LLVM Compiler Driver (Work In Progress)",
 105      /* ReadResponseFiles = */ false);
 106
 107   if (int ret = autogenerated::RunInitialization(langMap, graph))
 108     return ret;
 109
 110   if (CheckGraph) {
 111     ret = graph.Check();
 112     if (!ret)
 113       llvm::errs() << "check-graph: no errors found.\n";
 114
 115     return ret;
 116   }
 117
 118   if (ViewGraph) {
 119     graph.viewGraph();
 120     if (!WriteGraph)
 121       return 0;
 122   }
 123
 124   if (WriteGraph) {
 125     const std::string& Out = (OutputFilename.empty()
 126                               ? std::string("compilation-graph.dot")
 127                               : OutputFilename);
 128     return graph.writeGraph(Out);
 129   }
 130
 131   if (Time) {
 132     GlobalTimeLog = new std::stringstream;
 133     GlobalTimeLog->precision(2);
 134   }
 135
 136   ret = BuildTargets(graph, langMap);
 137
 138   if (Time) {
 139     llvm::errs() << GlobalTimeLog->str();
 140     delete GlobalTimeLog;
 141   }
 142
 143   return ret;
 144 }
 145
 146 } // end namespace llvmc