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/PassManager.h"
12 #include "llvm/Assembly/Parser.h"
13 #include "llvm/Transforms/CleanupGCCOutput.h"
14 #include "llvm/Transforms/LevelChange.h"
15 #include "llvm/Transforms/ConstantMerge.h"
16 #include "llvm/Transforms/ChangeAllocations.h"
17 #include "llvm/Transforms/Scalar/DCE.h"
18 #include "llvm/Transforms/Scalar/IndVarSimplify.h"
19 #include "llvm/Transforms/Scalar/InstructionCombining.h"
20 #include "llvm/Bytecode/WriteBytecodePass.h"
21 #include "Support/CommandLine.h"
26 cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
28 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
29 cl::Flag StopAtLevelRaise("stopraise", "Stop optimization before level raise",
32 int main(int argc, char **argv) {
33 cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
35 std::auto_ptr<Module> M;
37 // Parse the file now...
38 M.reset(ParseAssemblyFile(InputFilename));
39 } catch (const ParseException &E) {
40 cerr << E.getMessage() << endl;
45 cerr << "assembly didn't read correctly.\n";
49 if (OutputFilename == "") { // Didn't specify an output filename?
50 std::string IFN = InputFilename;
51 int Len = IFN.length();
52 if (IFN[Len-2] == '.' && IFN[Len-1] == 's') { // Source ends in .s?
53 OutputFilename = std::string(IFN.begin(), IFN.end()-2);
55 OutputFilename = IFN; // Append a .o to it
57 OutputFilename += ".o";
60 std::ofstream Out(OutputFilename.c_str(), ios::out);
62 cerr << "Error opening " << OutputFilename << "!\n";
66 // In addition to just parsing the input from GCC, we also want to spiff it up
67 // a little bit. Do this now.
70 Passes.add(createDeadInstEliminationPass()); // Remove Dead code/vars
71 Passes.add(createRaiseAllocationsPass()); // call %malloc -> malloc inst
72 Passes.add(createCleanupGCCOutputPass()); // Fix gccisms
73 Passes.add(createIndVarSimplifyPass()); // Simplify indvars
74 if (!StopAtLevelRaise) {
75 Passes.add(createRaisePointerReferencesPass()); // Eliminate casts
76 Passes.add(createConstantMergePass()); // Merge dup global consts
77 Passes.add(createInstructionCombiningPass()); // Combine silly seq's
78 Passes.add(createDeadCodeEliminationPass()); // Remove Dead code/vars
80 Passes.add(new WriteBytecodePass(&Out)); // Write bytecode to file...
82 // Run our queue of passes all at once now, efficiently.