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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/AsmParser/Parser.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.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 <memory>
using namespace llvm;
static cl::opt<std::string> InputFilename(cl::Positional,
cl::desc("<input .llvm file>"),
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"),
static cl::opt<bool> EmitModuleHash("module-hash", cl::desc("Emit module hash"),
static cl::opt<bool> DumpAsm("d", cl::desc("Print assembly as parsed"),
static cl::opt<bool>
DisableVerify("disable-verify", cl::Hidden,
cl::desc("Do not run verifier on input LLVM (dangerous!)"));
static cl::opt<bool> PreserveBitcodeUseListOrder(
cl::desc("Preserve use-list order when writing LLVM bitcode."),
cl::init(true), cl::Hidden);
static void WriteOutputFile(const Module *M) {
// Infer the output filename if needed.
if (OutputFilename.empty()) {
if (InputFilename == "-") {
OutputFilename = "-";
} else {
StringRef IFN = InputFilename;
OutputFilename = (IFN.endswith(".ll") ? IFN.drop_back(3) : IFN).str();
OutputFilename += ".bc";
std::error_code EC;
std::unique_ptr<ToolOutputFile> Out(
new ToolOutputFile(OutputFilename, EC, sys::fs::F_None));
if (EC) {
errs() << EC.message() << '\n';
if (Force || !CheckBitcodeOutputToConsole(Out->os(), true))
WriteBitcodeToFile(M, Out->os(), PreserveBitcodeUseListOrder, nullptr,
// Declare success.
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
PrettyStackTraceProgram X(argc, argv);
LLVMContext Context;
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, nullptr, !DisableVerify);
if (!M.get()) {
Err.print(argv[0], errs());
return 1;
if (!DisableVerify) {
std::string ErrorStr;
raw_string_ostream OS(ErrorStr);
if (verifyModule(*M.get(), &OS)) {
errs() << argv[0]
<< ": assembly parsed, but does not verify as correct!\n";
errs() << OS.str();
return 1;
if (DumpAsm)
errs() << "Here's the assembly:\n" << *M.get();
if (!DisableOutput)
return 0;