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90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
//===------------------------------------------------------------------------===
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// LLVM 'AS' UTILITY
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//
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// This utility may be invoked in the following manner:
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// as --help - Output information about command line switches
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// as [options] - Read LLVM assembly from stdin, write bytecode to stdout
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// as [options] x.ll - Read LLVM assembly from the x.ll file, write bytecode
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// to the x.bc file.
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//
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//===------------------------------------------------------------------------===
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#include "llvm/Module.h"
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#include "llvm/Assembly/Parser.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Bytecode/Writer.h"
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#include "Support/CommandLine.h"
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#include <fstream>
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#include <string>
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#include <memory>
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cl::String InputFilename ("", "Parse <arg> file, compile to bytecode", 0, "-");
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cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
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cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
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cl::Flag DumpAsm ("d", "Print assembly as parsed", cl::Hidden, false);
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .bc assembler\n");
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ostream *Out = 0;
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try {
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// Parse the file now...
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std::auto_ptr<Module> C(ParseAssemblyFile(InputFilename));
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if (C.get() == 0) {
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cerr << "assembly didn't read correctly.\n";
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return 1;
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}
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if (DumpAsm)
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cerr << "Here's the assembly:\n" << C.get();
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if (OutputFilename != "") { // Specified an output filename?
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if (!Force && !std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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cerr << "Error opening '" << OutputFilename << "': File exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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} else {
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if (InputFilename == "-") {
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OutputFilename = "-";
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Out = &cout;
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} else {
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std::string IFN = InputFilename;
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int Len = IFN.length();
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if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
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// Source ends in .ll
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OutputFilename = std::string(IFN.begin(), IFN.end()-3);
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} else {
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OutputFilename = IFN; // Append a .bc to it
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}
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OutputFilename += ".bc";
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if (!Force && !std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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cerr << "Error opening '" << OutputFilename << "': File exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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Out = new std::ofstream(OutputFilename.c_str());
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}
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}
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if (!Out->good()) {
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cerr << "Error opening " << OutputFilename << "!\n";
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return 1;
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}
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WriteBytecodeToFile(C.get(), *Out);
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} catch (const ParseException &E) {
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cerr << E.getMessage() << endl;
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return 1;
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}
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if (Out != &cout) delete Out;
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return 0;
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}
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