tools/llvm-as/llvm-as.cpp

   1 //===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  This utility may be invoked in the following manner:
  11 //   llvm-as --help         - Output information about command line switches
  12 //   llvm-as [options]      - Read LLVM asm from stdin, write bitcode to stdout
  13 //   llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
  14 //                            to the x.bc file.
  15 //
  16 //===----------------------------------------------------------------------===//
  17
  18 #include "llvm/LLVMContext.h"
  19 #include "llvm/Module.h"
  20 #include "llvm/Assembly/Parser.h"
  21 #include "llvm/Analysis/Verifier.h"
  22 #include "llvm/Bitcode/ReaderWriter.h"
  23 #include "llvm/Support/CommandLine.h"
  24 #include "llvm/Support/ManagedStatic.h"
  25 #include "llvm/Support/PrettyStackTrace.h"
  26 #include "llvm/Support/SourceMgr.h"
  27 #include "llvm/Support/SystemUtils.h"
  28 #include "llvm/Support/raw_ostream.h"
  29 #include "llvm/System/Signals.h"
  30 #include <memory>
  31 using namespace llvm;
  32
  33 static cl::opt<std::string>
  34 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
  35
  36 static cl::opt<std::string>
  37 OutputFilename("o", cl::desc("Override output filename"),
  38                cl::value_desc("filename"));
  39
  40 static cl::opt<bool>
  41 Force("f", cl::desc("Overwrite output files"));
  42
  43 static cl::opt<bool>
  44 DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
  45
  46 static cl::opt<bool>
  47 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
  48
  49 static cl::opt<bool>
  50 DisableVerify("disable-verify", cl::Hidden,
  51               cl::desc("Do not run verifier on input LLVM (dangerous!)"));
  52
  53 int main(int argc, char **argv) {
  54   // Print a stack trace if we signal out.
  55   sys::PrintStackTraceOnErrorSignal();
  56   PrettyStackTraceProgram X(argc, argv);
  57   LLVMContext &Context = getGlobalContext();
  58   llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  59   cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
  60
  61   int exitCode = 0;
  62   raw_ostream *Out = 0;
  63   try {
  64     // Parse the file now...
  65     SMDiagnostic Err;
  66     std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, Context));
  67     if (M.get() == 0) {
  68       Err.Print(argv[0], errs());
  69       return 1;
  70     }
  71
  72     if (!DisableVerify) {
  73       std::string Err;
  74       if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
  75         errs() << argv[0]
  76                << ": assembly parsed, but does not verify as correct!\n";
  77         errs() << Err;
  78         return 1;
  79       }
  80     }
  81
  82     if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
  83
  84     if (OutputFilename != "") {   // Specified an output filename?
  85       if (OutputFilename != "-") {  // Not stdout?
  86         std::string ErrorInfo;
  87         Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true,
  88                                  Force, ErrorInfo);
  89         if (!ErrorInfo.empty()) {
  90           errs() << ErrorInfo << '\n';
  91           if (!Force)
  92             errs() << "Use -f command line argument to force output\n";
  93           delete Out;
  94           return 1;
  95         }
  96       } else {                      // Specified stdout
  97         // FIXME: outs() is not binary!
  98         Out = &outs();
  99       }
 100     } else {
 101       if (InputFilename == "-") {
 102         OutputFilename = "-";
 103         Out = &outs();
 104       } else {
 105         std::string IFN = InputFilename;
 106         int Len = IFN.length();
 107         if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
 108           // Source ends in .ll
 109           OutputFilename = std::string(IFN.begin(), IFN.end()-3);
 110         } else {
 111           OutputFilename = IFN;   // Append a .bc to it
 112         }
 113         OutputFilename += ".bc";
 114
 115         std::string ErrorInfo;
 116         Out = new raw_fd_ostream(OutputFilename.c_str(), /*Binary=*/true,
 117                                  Force, ErrorInfo);
 118         if (!ErrorInfo.empty()) {
 119           errs() << ErrorInfo << '\n';
 120           if (!Force)
 121             errs() << "Use -f command line argument to force output\n";
 122           delete Out;
 123           return 1;
 124         }
 125         // Make sure that the Out file gets unlinked from the disk if we get a
 126         // SIGINT
 127         sys::RemoveFileOnSignal(sys::Path(OutputFilename));
 128       }
 129     }
 130
 131     if (!DisableOutput)
 132       if (Force || !CheckBitcodeOutputToConsole(Out,true))
 133         WriteBitcodeToFile(M.get(), *Out);
 134   } catch (const std::string& msg) {
 135     errs() << argv[0] << ": " << msg << "\n";
 136     exitCode = 1;
 137   } catch (...) {
 138     errs() << argv[0] << ": Unexpected unknown exception occurred.\n";
 139     exitCode = 1;
 140   }
 141
 142   if (Out != &outs()) delete Out;
 143   return exitCode;
 144 }
 145