tools/llvm-upgrade/llvm-upgrade.cpp

   1 //===--- llvm-upgrade.cpp - The LLVM Assembly Upgrader --------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by Reid Spencer and is distributed under the
   6 // University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  This utility will upgrade LLVM 1.9 Assembly to 2.0 format. It may be
  11 //  invoked as a filter, like this:
  12 //    llvm-1.9/bin/llvm-dis < 1.9.bc | llvm-upgrade | llvm-as > 2.0.bc
  13 //
  14 //  or, you can directly upgrade, like this:
  15 //    llvm-upgrade -o 2.0.ll < 1.9.ll
  16 //
  17 //  llvm-upgrade won't overwrite files by default. Use -f to force it to
  18 //  overwrite the output file.
  19 //
  20 //===----------------------------------------------------------------------===//
  21
  22 #include "UpgradeInternals.h"
  23 #include "llvm/Module.h"
  24 #include "llvm/Support/CommandLine.h"
  25 #include "llvm/Support/ManagedStatic.h"
  26 #include "llvm/Support/Streams.h"
  27 #include "llvm/Support/SystemUtils.h"
  28 #include "llvm/System/Signals.h"
  29 #include <fstream>
  30 #include <iostream>
  31 #include <memory>
  32 using namespace llvm;
  33
  34 static cl::opt<std::string>
  35 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
  36
  37 static cl::opt<std::string>
  38 OutputFilename("o", cl::desc("Override output filename"),
  39                cl::value_desc("filename"), cl::init("-"));
  40
  41 static cl::opt<bool>
  42 Force("f", cl::desc("Overwrite output files"), cl::init(false));
  43
  44 static cl::opt<bool>
  45 AddAttrs("add-attrs", cl::desc("Add function result and argument attributes"),
  46          cl::init(false));
  47
  48 static cl::opt<bool>
  49 Debug("debug-upgrade-yacc", cl::desc("Print debug output from yacc parser"),
  50       cl::Hidden, cl::init(false));
  51
  52 int main(int argc, char **argv) {
  53   llvm_shutdown_obj X;  // Call llvm_shutdown() on exit.
  54   cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
  55   sys::PrintStackTraceOnErrorSignal();
  56
  57   int exitCode = 0;
  58   std::ostream *Out = 0;
  59   std::istream *In = 0;
  60   try {
  61     if (OutputFilename != "") {   // Specified an output filename?
  62       if (OutputFilename != "-") {  // Not stdout?
  63         if (!Force && std::ifstream(OutputFilename.c_str())) {
  64           // If force is not specified, make sure not to overwrite a file!
  65           cerr << argv[0] << ": error opening '" << OutputFilename
  66                << "': file exists!\n"
  67                << "Use -f command line argument to force output\n";
  68           return 1;
  69         }
  70         Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
  71                                 std::ios::trunc);
  72       } else {                      // Specified stdout
  73         Out = &std::cout;
  74       }
  75     } else {
  76       if (InputFilename == "-") {
  77         OutputFilename = "-";
  78         Out = &std::cout;
  79       } else {
  80         std::string IFN = InputFilename;
  81         int Len = IFN.length();
  82         if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
  83           // Source ends in .ll
  84           OutputFilename = std::string(IFN.begin(), IFN.end()-3);
  85         } else {
  86           OutputFilename = IFN;   // Append to it
  87         }
  88         OutputFilename += ".llu";
  89
  90         if (!Force && std::ifstream(OutputFilename.c_str())) {
  91           // If force is not specified, make sure not to overwrite a file!
  92           cerr << argv[0] << ": error opening '" << OutputFilename
  93                << "': file exists!\n"
  94                << "Use -f command line argument to force output\n";
  95           return 1;
  96         }
  97
  98         Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
  99                                 std::ios::trunc);
 100         // Make sure that the Out file gets unlinked from the disk if we get a
 101         // SIGINT
 102         sys::RemoveFileOnSignal(sys::Path(OutputFilename));
 103       }
 104     }
 105
 106     if (InputFilename == "-") {
 107       In = &std::cin;
 108       InputFilename = "<stdin>";
 109     } else {
 110       In = new std::ifstream(InputFilename.c_str());
 111     }
 112
 113     if (!Out->good()) {
 114       cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
 115       return 1;
 116     }
 117
 118     if (!In->good()) {
 119       cerr << argv[0] << ": error opening " << InputFilename << "!\n";
 120       return 1;
 121     }
 122
 123     Module *M = UpgradeAssembly(InputFilename, *In, Debug, AddAttrs);
 124     if (!M) {
 125       cerr << argv[0] << ": No module returned from assembly parsing\n";
 126       *Out << argv[0] << ": parse failed.";
 127       exit(1);
 128     }
 129
 130     // Finally, print the module on the output stream.
 131     M->print(Out);
 132
 133   } catch (const std::string& caught_message) {
 134     cerr << argv[0] << ": " << caught_message << "\n";
 135     exitCode = 1;
 136   } catch (...) {
 137     cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
 138     exitCode = 1;
 139   }
 140
 141   if (Out != &std::cout) delete Out;
 142   return exitCode;
 143 }
 144