llvm-as.cpp revision 198090 
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>
31using namespace llvm;
32
33static cl::opt<std::string>
34InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
35
36static cl::opt<std::string>
37OutputFilename("o", cl::desc("Override output filename"),
38               cl::value_desc("filename"));
39
40static cl::opt<bool>
41Force("f", cl::desc("Enable binary output on terminals"));
42
43static cl::opt<bool>
44DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
45
46static cl::opt<bool>
47DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
48
49static cl::opt<bool>
50DisableVerify("disable-verify", cl::Hidden,
51              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
52
53int 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  // Parse the file now...
62  SMDiagnostic Err;
63  std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename, Err, Context));
64  if (M.get() == 0) {
65    Err.Print(argv[0], errs());
66    return 1;
67  }
68
69  if (!DisableVerify) {
70    std::string Err;
71    if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
72      errs() << argv[0]
73             << ": assembly parsed, but does not verify as correct!\n";
74      errs() << Err;
75      return 1;
76    }
77  }
78
79  if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
80
81  // Infer the output filename if needed.
82  if (OutputFilename.empty()) {
83    if (InputFilename == "-") {
84      OutputFilename = "-";
85    } else {
86      std::string IFN = InputFilename;
87      int Len = IFN.length();
88      if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
89        // Source ends in .ll
90        OutputFilename = std::string(IFN.begin(), IFN.end()-3);
91      } else {
92        OutputFilename = IFN;   // Append a .bc to it
93      }
94      OutputFilename += ".bc";
95    }
96  }
97
98  // Make sure that the Out file gets unlinked from the disk if we get a
99  // SIGINT.
100  if (OutputFilename != "-")
101    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
102
103  std::string ErrorInfo;
104  std::auto_ptr<raw_ostream> Out
105  (new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
106                      raw_fd_ostream::F_Binary));
107  if (!ErrorInfo.empty()) {
108    errs() << ErrorInfo << '\n';
109    return 1;
110  }
111
112  if (!DisableOutput)
113    if (Force || !CheckBitcodeOutputToConsole(*Out, true))
114      WriteBitcodeToFile(M.get(), *Out);
115  return 0;
116}
117
118