| //===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===// |
| // |
| // 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 is the llc code generator driver. It provides a convenient |
| // command-line interface for generating native assembly-language code |
| // or C code, given LLVM bytecode. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Bytecode/Reader.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include "llvm/Target/TargetMachineRegistry.h" |
| #include "llvm/Transforms/Scalar.h" |
| #include "llvm/Module.h" |
| #include "llvm/PassManager.h" |
| #include "llvm/Pass.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/PluginLoader.h" |
| #include "llvm/System/Signals.h" |
| #include <fstream> |
| #include <iostream> |
| #include <memory> |
| |
| using namespace llvm; |
| |
| // General options for llc. Other pass-specific options are specified |
| // within the corresponding llc passes, and target-specific options |
| // and back-end code generation options are specified with the target machine. |
| // |
| static cl::opt<std::string> |
| InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-")); |
| |
| static cl::opt<std::string> |
| OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); |
| |
| static cl::opt<bool> Force("f", cl::desc("Overwrite output files")); |
| |
| static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser> |
| MArch("march", cl::desc("Architecture to generate assembly for:")); |
| |
| // GetFileNameRoot - Helper function to get the basename of a filename... |
| static inline std::string |
| GetFileNameRoot(const std::string &InputFilename) { |
| std::string IFN = InputFilename; |
| std::string outputFilename; |
| int Len = IFN.length(); |
| if ((Len > 2) && |
| IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') { |
| outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/ |
| } else { |
| outputFilename = IFN; |
| } |
| return outputFilename; |
| } |
| |
| |
| // main - Entry point for the llc compiler. |
| // |
| int main(int argc, char **argv) { |
| cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n"); |
| sys::PrintStackTraceOnErrorSignal(); |
| |
| // Load the module to be compiled... |
| std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename)); |
| if (M.get() == 0) { |
| std::cerr << argv[0] << ": bytecode didn't read correctly.\n"; |
| return 1; |
| } |
| Module &mod = *M.get(); |
| |
| // Allocate target machine. First, check whether the user has |
| // explicitly specified an architecture to compile for. |
| TargetMachine* (*TargetMachineAllocator)(const Module&, |
| IntrinsicLowering *) = 0; |
| if (MArch == 0) { |
| std::string Err; |
| MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err); |
| if (MArch == 0) { |
| std::cerr << argv[0] << ": error auto-selecting target for module '" |
| << Err << "'. Please use the -march option to explicitly " |
| << "pick a target.\n"; |
| return 1; |
| } |
| } |
| |
| std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, 0)); |
| assert(target.get() && "Could not allocate target machine!"); |
| TargetMachine &Target = *target.get(); |
| const TargetData &TD = Target.getTargetData(); |
| |
| // Build up all of the passes that we want to do to the module... |
| PassManager Passes; |
| Passes.add(new TargetData("llc", TD.isLittleEndian(), TD.getPointerSize(), |
| TD.getPointerAlignment(), TD.getDoubleAlignment())); |
| |
| // Figure out where we are going to send the output... |
| std::ostream *Out = 0; |
| if (OutputFilename != "") { |
| if (OutputFilename != "-") { |
| // Specified an output filename? |
| if (!Force && std::ifstream(OutputFilename.c_str())) { |
| // If force is not specified, make sure not to overwrite a file! |
| std::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()); |
| |
| // Make sure that the Out file gets unlinked from the disk if we get a |
| // SIGINT |
| sys::RemoveFileOnSignal(sys::Path(OutputFilename)); |
| } else { |
| Out = &std::cout; |
| } |
| } else { |
| if (InputFilename == "-") { |
| OutputFilename = "-"; |
| Out = &std::cout; |
| } else { |
| OutputFilename = GetFileNameRoot(InputFilename); |
| |
| if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE |
| OutputFilename += ".s"; |
| else |
| OutputFilename += ".cbe.c"; |
| |
| if (!Force && std::ifstream(OutputFilename.c_str())) { |
| // If force is not specified, make sure not to overwrite a file! |
| std::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()); |
| if (!Out->good()) { |
| std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n"; |
| delete Out; |
| return 1; |
| } |
| |
| // Make sure that the Out file gets unlinked from the disk if we get a |
| // SIGINT |
| sys::RemoveFileOnSignal(sys::Path(OutputFilename)); |
| } |
| } |
| |
| // Ask the target to add backend passes as necessary |
| if (Target.addPassesToEmitAssembly(Passes, *Out)) { |
| std::cerr << argv[0] << ": target '" << Target.getName() |
| << "' does not support static compilation!\n"; |
| if (Out != &std::cout) delete Out; |
| // And the Out file is empty and useless, so remove it now. |
| std::remove(OutputFilename.c_str()); |
| return 1; |
| } else { |
| // Run our queue of passes all at once now, efficiently. |
| Passes.run(*M.get()); |
| } |
| |
| // Delete the ostream if it's not a stdout stream |
| if (Out != &std::cout) delete Out; |
| |
| return 0; |
| } |