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/IR/LLVMContext.h"
19#include "llvm/IR/Verifier.h"
20#include "llvm/AsmParser/Parser.h"
21#include "llvm/Bitcode/ReaderWriter.h"
22#include "llvm/IR/Module.h"
23#include "llvm/Support/CommandLine.h"
24#include "llvm/Support/FileSystem.h"
25#include "llvm/Support/ManagedStatic.h"
26#include "llvm/Support/PrettyStackTrace.h"
27#include "llvm/Support/Signals.h"
28#include "llvm/Support/SourceMgr.h"
29#include "llvm/Support/SystemUtils.h"
30#include "llvm/Support/ToolOutputFile.h"
31
32#include "BitWriter_3_2/ReaderWriter_3_2.h"
33#include "BitWriter_2_9/ReaderWriter_2_9.h"
34#include "BitWriter_2_9_func/ReaderWriter_2_9_func.h"
35
36#include <memory>
37using namespace llvm;
38
39static cl::opt<std::string>
40InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
41
42static cl::opt<std::string>
43OutputFilename("o", cl::desc("Override output filename"),
44               cl::value_desc("filename"));
45
46static cl::opt<bool>
47Force("f", cl::desc("Enable binary output on terminals"));
48
49static cl::opt<bool>
50DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
51
52static cl::opt<bool>
53DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
54
55static cl::opt<bool>
56DisableVerify("disable-verify", cl::Hidden,
57              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
58
59enum BCVersion {
60  BC29, BC29Func, BC32, BCHEAD
61};
62
63cl::opt<BCVersion> BitcodeVersion("bitcode-version",
64  cl::desc("Set the bitcode version to be written:"),
65  cl::values(
66    clEnumValN(BC29, "BC29", "Version 2.9"),
67     clEnumVal(BC29Func,     "Version 2.9 func"),
68     clEnumVal(BC32,         "Version 3.2"),
69     clEnumVal(BCHEAD,       "Most current version"),
70    clEnumValEnd), cl::init(BC32));
71
72static void WriteOutputFile(const Module *M) {
73  // Infer the output filename if needed.
74  if (OutputFilename.empty()) {
75    if (InputFilename == "-") {
76      OutputFilename = "-";
77    } else {
78      std::string IFN = InputFilename;
79      int Len = IFN.length();
80      if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
81        // Source ends in .ll
82        OutputFilename = std::string(IFN.begin(), IFN.end()-3);
83      } else {
84        OutputFilename = IFN;   // Append a .bc to it
85      }
86      OutputFilename += ".bc";
87    }
88  }
89
90  std::error_code EC;
91  std::unique_ptr<tool_output_file> Out
92  (new tool_output_file(OutputFilename.c_str(), EC, llvm::sys::fs::F_None));
93  if (EC) {
94    // TODO(srhines): This isn't actually very specific and needs cleanup.
95    errs() << EC.message() << '\n';
96    exit(1);
97  }
98
99  if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
100    switch(BitcodeVersion) {
101      case BC29:
102        llvm_2_9::WriteBitcodeToFile(M, Out->os());
103        break;
104      case BC29Func:
105        llvm_2_9_func::WriteBitcodeToFile(M, Out->os());
106        break;
107      case BC32:
108        llvm_3_2::WriteBitcodeToFile(M, Out->os());
109        break;
110      case BCHEAD:
111        llvm::WriteBitcodeToFile(M, Out->os());
112        break;
113    }
114  }
115
116  // Declare success.
117  Out->keep();
118}
119
120int main(int argc, char **argv) {
121  // Print a stack trace if we signal out.
122  sys::PrintStackTraceOnErrorSignal();
123  PrettyStackTraceProgram X(argc, argv);
124  LLVMContext &Context = getGlobalContext();
125  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
126  cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
127
128  // Parse the file now...
129  SMDiagnostic Err;
130  std::unique_ptr<Module> M(parseAssemblyFile(InputFilename, Err, Context));
131  if (M.get() == 0) {
132    Err.print(argv[0], errs());
133    return 1;
134  }
135
136  if (!DisableVerify) {
137    std::string Err;
138    raw_string_ostream stream(Err);
139    if (verifyModule(*M.get(), &stream)) {
140      errs() << argv[0]
141             << ": assembly parsed, but does not verify as correct!\n";
142      errs() << Err;
143      return 1;
144    }
145  }
146
147  if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
148
149  if (!DisableOutput)
150    WriteOutputFile(M.get());
151
152  return 0;
153}
154