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//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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 bytecode to stdout
// llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bytecode
// to the x.bc file.
//
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Assembly/Parser.h"
#include "llvm/Bytecode/Writer.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Streams.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/System/Signals.h"
#include <fstream>
#include <iostream>
#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"),
cl::value_desc("filename"));
static cl::opt<bool>
Force("f", cl::desc("Overwrite output files"));
static cl::opt<bool>
DumpAsm("d", cl::desc("Print assembly as parsed"), cl::Hidden);
static cl::opt<bool>
NoCompress("disable-compression", cl::init(false),
cl::desc("Don't compress the generated bytecode"));
static cl::opt<bool>
DisableVerify("disable-verify", cl::Hidden,
cl::desc("Do not run verifier on input LLVM (dangerous!)"));
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
sys::PrintStackTraceOnErrorSignal();
int exitCode = 0;
std::ostream *Out = 0;
try {
// Parse the file now...
ParseError Err;
std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename,&Err));
if (M.get() == 0) {
llvm_cerr << argv[0] << ": " << Err.getMessage() << "\n";
return 1;
}
if (!DisableVerify) {
std::string Err;
if (verifyModule(*M.get(), ReturnStatusAction, &Err)) {
llvm_cerr << argv[0]
<< ": assembly parsed, but does not verify as correct!\n";
llvm_cerr << Err;
return 1;
}
}
if (DumpAsm) llvm_cerr << "Here's the assembly:\n" << *M.get();
if (OutputFilename != "") { // Specified an output filename?
if (OutputFilename != "-") { // Not stdout?
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
llvm_cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
std::ios::trunc | std::ios::binary);
} else { // Specified stdout
// FIXME: cout is not binary!
Out = &std::cout;
}
} else {
if (InputFilename == "-") {
OutputFilename = "-";
Out = &std::cout;
} 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";
if (!Force && std::ifstream(OutputFilename.c_str())) {
// If force is not specified, make sure not to overwrite a file!
llvm_cerr << argv[0] << ": error opening '" << OutputFilename
<< "': file exists!\n"
<< "Use -f command line argument to force output\n";
return 1;
}
Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
std::ios::trunc | std::ios::binary);
// Make sure that the Out file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
}
if (!Out->good()) {
llvm_cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
return 1;
}
if (Force || !CheckBytecodeOutputToConsole(Out,true)) {
llvm_ostream L(*Out);
WriteBytecodeToFile(M.get(), L, !NoCompress);
}
} catch (const std::string& msg) {
llvm_cerr << argv[0] << ": " << msg << "\n";
exitCode = 1;
} catch (...) {
llvm_cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
exitCode = 1;
}
if (Out != &std::cout) delete Out;
return exitCode;
}
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