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/Transforms/LevelChange.h"
14 #include "llvm/Transforms/ConstantMerge.h"
15 #include "llvm/Transforms/ChangeAllocations.h"
16 #include "llvm/Transforms/Scalar/DCE.h"
17 #include "llvm/Transforms/Scalar/IndVarSimplify.h"
18 #include "llvm/Transforms/Scalar/InstructionCombining.h"
19 #include "llvm/Bytecode/WriteBytecodePass.h"
20 #include "Support/CommandLine.h"
25 cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
27 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
29 int main(int argc, char **argv) {
30 cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
32 std::auto_ptr<Module> M;
34 // Parse the file now...
35 M.reset(ParseAssemblyFile(InputFilename));
36 } catch (const ParseException &E) {
37 cerr << E.getMessage() << endl;
42 cerr << "assembly didn't read correctly.\n";
46 if (OutputFilename == "") { // Didn't specify an output filename?
47 std::string IFN = InputFilename;
48 int Len = IFN.length();
49 if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
50 OutputFilename = std::string(IFN.begin(), IFN.end()-2);
52 OutputFilename = IFN; // Append a .o to it
54 OutputFilename += ".o";
57 std::ofstream Out(OutputFilename.c_str(), ios::out);
59 cerr << "Error opening " << OutputFilename << "!\n";
63 // In addition to just parsing the input from GCC, we also want to spiff it up
64 // a little bit. Do this now.
67 Passes.add(new DeadInstElimination()); // Remove Dead code/vars
68 Passes.add(new RaiseAllocations()); // call %malloc -> malloc inst
69 Passes.add(new CleanupGCCOutput()); // Fix gccisms
70 Passes.add(new InductionVariableSimplify()); // Simplify indvars
71 Passes.add(new RaisePointerReferences()); // Eliminate casts
72 Passes.add(new ConstantMerge()); // Merge dup global consts
73 Passes.add(new InstructionCombining()); // Combine silly seq's
74 Passes.add(new DeadCodeElimination()); // Remove Dead code/vars
75 Passes.add(new WriteBytecodePass(&Out)); // Write bytecode to file...
77 // Run our queue of passes all at once now, efficiently.