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 "llvm/System/Signals.h"
30 static cl::opt<std::string>
31 InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
33 static cl::opt<std::string>
34 OutputFilename("o", cl::desc("Override output filename"),
35 cl::value_desc("filename"));
38 Force("f", cl::desc("Overwrite output files"));
41 DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
44 DisableVerify("disable-verify", cl::Hidden,
45 cl::desc("Do not run verifier on input LLVM (dangerous!)"));
47 int main(int argc, char **argv) {
48 cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
49 PrintStackTraceOnErrorSignal();
51 std::ostream *Out = 0;
53 // Parse the file now...
54 std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename));
56 std::cerr << argv[0] << ": assembly didn't read correctly.\n";
62 verifyModule(*M.get(), ThrowExceptionAction);
63 } catch (const std::string &Err) {
65 << ": assembly parsed, but does not verify as correct!\n";
70 if (DumpAsm) std::cerr << "Here's the assembly:\n" << M.get();
72 if (OutputFilename != "") { // Specified an output filename?
73 if (OutputFilename != "-") { // Not stdout?
74 if (!Force && std::ifstream(OutputFilename.c_str())) {
75 // If force is not specified, make sure not to overwrite a file!
76 std::cerr << argv[0] << ": error opening '" << OutputFilename
77 << "': file exists!\n"
78 << "Use -f command line argument to force output\n";
81 Out = new std::ofstream(OutputFilename.c_str(), std::ios_base::out |
82 std::ios_base::trunc | std::ios_base::binary);
83 } else { // Specified stdout
87 if (InputFilename == "-") {
91 std::string IFN = InputFilename;
92 int Len = IFN.length();
93 if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
95 OutputFilename = std::string(IFN.begin(), IFN.end()-3);
97 OutputFilename = IFN; // Append a .bc to it
99 OutputFilename += ".bc";
101 if (!Force && std::ifstream(OutputFilename.c_str())) {
102 // If force is not specified, make sure not to overwrite a file!
103 std::cerr << argv[0] << ": error opening '" << OutputFilename
104 << "': file exists!\n"
105 << "Use -f command line argument to force output\n";
109 Out = new std::ofstream(OutputFilename.c_str(), std::ios_base::out |
110 std::ios_base::trunc | std::ios_base::binary);
111 // Make sure that the Out file gets unlinked from the disk if we get a
113 RemoveFileOnSignal(OutputFilename);
118 std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
122 WriteBytecodeToFile(M.get(), *Out);
123 } catch (const ParseException &E) {
124 std::cerr << argv[0] << ": " << E.getMessage() << "\n";
128 if (Out != &std::cout) delete Out;