1 //===------------------------------------------------------------------------===
2 // LLVM 'GCCAS' UTILITY
4 // This utility is designed to be used by the GCC frontend for creating
5 // bytecode files from it's intermediate llvm assembly. The requirements for
6 // this utility are thus slightly different than that of the standard as util.
8 //===------------------------------------------------------------------------===
10 #include "llvm/Module.h"
11 #include "llvm/Assembly/Parser.h"
12 #include "llvm/Transforms/CleanupGCCOutput.h"
13 #include "llvm/Optimizations/DCE.h"
14 #include "llvm/Bytecode/Writer.h"
15 #include "llvm/Support/CommandLine.h"
20 cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
22 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
24 int main(int argc, char **argv) {
25 cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
28 std::auto_ptr<Module> M;
30 // Parse the file now...
31 M.reset(ParseAssemblyFile(InputFilename));
32 } catch (const ParseException &E) {
33 cerr << E.getMessage() << endl;
38 cerr << "assembly didn't read correctly.\n";
42 if (OutputFilename == "") { // Didn't specify an output filename?
43 string IFN = InputFilename;
44 int Len = IFN.length();
45 if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
46 OutputFilename = string(IFN.begin(), IFN.end()-2);
48 OutputFilename = IFN; // Append a .o to it
50 OutputFilename += ".o";
53 Out = new ofstream(OutputFilename.c_str(), ios::out);
55 cerr << "Error opening " << OutputFilename << "!\n";
59 // In addition to just parsing the input from GCC, we also want to spiff it up
60 // a little bit. Do this now.
63 Passes.push_back(new CleanupGCCOutput());
64 Passes.push_back(new opt::DeadCodeElimination());
66 // Run our queue of passes all at once now, efficiently. This form of
67 // runAllPasses frees the Pass objects after runAllPasses completes.
69 Pass::runAllPassesAndFree(M.get(), Passes);
71 WriteBytecodeToFile(M.get(), *Out);