1 //===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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 bytecode to stdout
13 // llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bytecode
16 //===------------------------------------------------------------------------===
18 #include "llvm/Module.h"
19 #include "llvm/Assembly/Parser.h"
20 #include "llvm/Bytecode/Writer.h"
21 #include "llvm/Analysis/Verifier.h"
22 #include "Support/CommandLine.h"
23 #include "Support/Signals.h"
27 static cl::opt<std::string>
28 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
30 static cl::opt<std::string>
31 OutputFilename("o", cl::desc("Override output filename"),
32 cl::value_desc("filename"));
35 Force("f", cl::desc("Overwrite output files"));
38 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
41 DisableVerify("disable-verify", cl::Hidden,
42 cl::desc("Do not run verifier on input LLVM (dangerous!"));
44 int main(int argc, char **argv) {
45 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
47 std::ostream *Out = 0;
49 // Parse the file now...
50 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename));
52 std::cerr << argv[0] << ": assembly didn't read correctly.\n";
56 if (!DisableVerify && verifyModule(*M.get())) {
58 << ": assembly parsed, but does not verify as correct!\n";
62 if (DumpAsm) std::cerr << "Here's the assembly:\n" << M.get();
64 if (OutputFilename != "") { // Specified an output filename?
65 if (OutputFilename != "-") { // Not stdout?
66 if (!Force && std::ifstream(OutputFilename.c_str())) {
67 // If force is not specified, make sure not to overwrite a file!
68 std::cerr << argv[0] << ": error opening '" << OutputFilename
69 << "': file exists!\n"
70 << "Use -f command line argument to force output\n";
73 Out = new std::ofstream(OutputFilename.c_str());
74 } else { // Specified stdout
78 if (InputFilename == "-") {
82 std::string IFN = InputFilename;
83 int Len = IFN.length();
84 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
86 OutputFilename = std::string(IFN.begin(), IFN.end()-3);
88 OutputFilename = IFN; // Append a .bc to it
90 OutputFilename += ".bc";
92 if (!Force && std::ifstream(OutputFilename.c_str())) {
93 // If force is not specified, make sure not to overwrite a file!
94 std::cerr << argv[0] << ": error opening '" << OutputFilename
95 << "': file exists!\n"
96 << "Use -f command line argument to force output\n";
100 Out = new std::ofstream(OutputFilename.c_str());
101 // Make sure that the Out file gets unlinked from the disk if we get a
103 RemoveFileOnSignal(OutputFilename);
108 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
112 WriteBytecodeToFile(M.get(), *Out);
113 } catch (const ParseException &E) {
114 std::cerr << argv[0] << ": " << E.getMessage() << "\n";
118 if (Out != &std::cout) delete Out;