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//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This utility may be invoked in the following manner:
// llvm-as --help - Output information about command line switches
// llvm-as [options] - Read LLVM asm from stdin, write bitcode to stdout
// llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bitcode
// to the x.bc file.
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Verifier.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/ToolOutputFile.h"
#include "BitWriter_3_2/ReaderWriter_3_2.h"
#include "BitWriter_2_9/ReaderWriter_2_9.h"
#include "BitWriter_2_9_func/ReaderWriter_2_9_func.h"
#include <memory>
using namespace llvm;
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input .llvm file>"), cl::init("-"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
static cl::opt<bool>
Force("f", cl::desc("Enable binary output on terminals"));
static cl::opt<bool>
DisableOutput("disable-output", cl::desc("Disable output"), cl::init(false));
static cl::opt<bool>
DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
static cl::opt<bool>
DisableVerify("disable-verify", cl::Hidden,
cl::desc("Do not run verifier on input LLVM (dangerous!)"));
enum BCVersion {
BC29, BC29Func, BC32, BCHEAD
cl::opt<BCVersion> BitcodeVersion("bitcode-version",
cl::desc("Set the bitcode version to be written:"),
clEnumValN(BC29, "BC29", "Version 2.9"),
clEnumVal(BC29Func, "Version 2.9 func"),
clEnumVal(BC32, "Version 3.2"),
clEnumVal(BCHEAD, "Most current version"),
clEnumValEnd), cl::init(BC32));
static void WriteOutputFile(const Module *M) {
// Infer the output filename if needed.
if (OutputFilename.empty()) {
if (InputFilename == "-") {
OutputFilename = "-";
} else {
std::string IFN = InputFilename;
int Len = IFN.length();
if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
// Source ends in .ll
OutputFilename = std::string(IFN.begin(), IFN.end()-3);
} else {
OutputFilename = IFN; // Append a .bc to it
OutputFilename += ".bc";
std::error_code EC;
std::unique_ptr<tool_output_file> Out
(new tool_output_file(OutputFilename.c_str(), EC, llvm::sys::fs::F_None));
if (EC) {
// TODO(srhines): This isn't actually very specific and needs cleanup.
errs() << EC.message() << '\n';
if (Force || !CheckBitcodeOutputToConsole(Out->os(), true)) {
switch(BitcodeVersion) {
case BC29:
llvm_2_9::WriteBitcodeToFile(M, Out->os());
case BC29Func:
llvm_2_9_func::WriteBitcodeToFile(M, Out->os());
case BC32:
llvm_3_2::WriteBitcodeToFile(M, Out->os());
case BCHEAD:
llvm::WriteBitcodeToFile(M, Out->os());
// Declare success.
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
PrettyStackTraceProgram X(argc, argv);
LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm .ll -> .bc assembler\n");
// Parse the file now...
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyFile(InputFilename, Err, Context));
if (M.get() == 0) {
Err.print(argv[0], errs());
return 1;
if (!DisableVerify) {
std::string Err;
raw_string_ostream stream(Err);
if (verifyModule(*M.get(), &stream)) {
errs() << argv[0]
<< ": assembly parsed, but does not verify as correct!\n";
errs() << Err;
return 1;
if (DumpAsm) errs() << "Here's the assembly:\n" << *M.get();
if (!DisableOutput)
return 0;