X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Fllc%2Fllc.cpp;h=7b55c8092cf125f20808827d1c9eb558de8b9bf0;hb=82a13c9c4811e40d0ff858c508cb54d672ee926e;hp=4d1bb772edf318c532bd587eb74c91f6e85780fb;hpb=29abc971009cf4b18c02e7e972de92d98aef3784;p=oota-llvm.git diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp index 4d1bb772edf..7b55c8092cf 100644 --- a/tools/llc/llc.cpp +++ b/tools/llc/llc.cpp @@ -1,50 +1,102 @@ //===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===// // -// This is the llc 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 bitcode. // //===----------------------------------------------------------------------===// -#include "llvm/Bytecode/Reader.h" -#include "llvm/Target/TargetMachineImpls.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/CodeGen/FileWriters.h" +#include "llvm/CodeGen/LinkAllCodegenComponents.h" +#include "llvm/Target/SubtargetFeature.h" +#include "llvm/Target/TargetData.h" #include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetMachineRegistry.h" #include "llvm/Transforms/Scalar.h" #include "llvm/Module.h" +#include "llvm/ModuleProvider.h" #include "llvm/PassManager.h" #include "llvm/Pass.h" -#include "Support/CommandLine.h" -#include "Support/Signals.h" -#include +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ManagedStatic.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/PluginLoader.h" +#include "llvm/Support/FileUtilities.h" +#include "llvm/Analysis/Verifier.h" +#include "llvm/System/Signals.h" +#include "llvm/Config/config.h" +#include "llvm/LinkAllVMCore.h" #include +#include +#include +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 -InputFilename(cl::Positional, cl::desc(""), cl::init("-")); +InputFilename(cl::Positional, cl::desc(""), cl::init("-")); static cl::opt OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename")); static cl::opt Force("f", cl::desc("Overwrite output files")); -enum ArchName { noarch, x86, Sparc }; +static cl::opt Fast("fast", + cl::desc("Generate code quickly, potentially sacrificing code quality")); + +static cl::opt +TargetTriple("mtriple", cl::desc("Override target triple for module")); + +static cl::opt +MArch("march", cl::desc("Architecture to generate code for:")); + +static cl::opt +MCPU("mcpu", + cl::desc("Target a specific cpu type (-mcpu=help for details)"), + cl::value_desc("cpu-name"), + cl::init("")); -static cl::opt -Arch("march", cl::desc("Architecture to generate assembly for:"), cl::Prefix, - cl::values(clEnumVal(x86, " IA-32 (Pentium and above)"), - clEnumValN(Sparc, "sparc", " SPARC V9"), - 0), - cl::init(noarch)); +static cl::list +MAttrs("mattr", + cl::CommaSeparated, + cl::desc("Target specific attributes (-mattr=help for details)"), + cl::value_desc("a1,+a2,-a3,...")); -// GetFileNameRoot - Helper function to get the basename of a filename... +cl::opt +FileType("filetype", cl::init(TargetMachine::AssemblyFile), + cl::desc("Choose a file type (not all types are supported by all targets):"), + cl::values( + clEnumValN(TargetMachine::AssemblyFile, "asm", + " Emit an assembly ('.s') file"), + clEnumValN(TargetMachine::ObjectFile, "obj", + " Emit a native object ('.o') file [experimental]"), + clEnumValN(TargetMachine::DynamicLibrary, "dynlib", + " Emit a native dynamic library ('.so') file" + " [experimental]"), + clEnumValEnd)); + +cl::opt NoVerify("disable-verify", cl::Hidden, + cl::desc("Do not verify input module")); + + +// GetFileNameRoot - Helper function to get the basename of a filename. static inline std::string -GetFileNameRoot(const std::string &InputFilename) -{ +GetFileNameRoot(const std::string &InputFilename) { std::string IFN = InputFilename; std::string outputFilename; int Len = IFN.length(); - if (IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') { + 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; @@ -52,119 +104,199 @@ GetFileNameRoot(const std::string &InputFilename) return outputFilename; } +static std::ostream *GetOutputStream(const char *ProgName) { + if (OutputFilename != "") { + if (OutputFilename == "-") + return &std::cout; + + // 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 << ProgName << ": error opening '" << OutputFilename + << "': file exists!\n" + << "Use -f command line argument to force output\n"; + return 0; + } + // Make sure that the Out file gets unlinked from the disk if we get a + // SIGINT + sys::RemoveFileOnSignal(sys::Path(OutputFilename)); + + return new std::ofstream(OutputFilename.c_str()); + } + + if (InputFilename == "-") { + OutputFilename = "-"; + return &std::cout; + } + + OutputFilename = GetFileNameRoot(InputFilename); + + switch (FileType) { + case TargetMachine::AssemblyFile: + if (MArch->Name[0] != 'c' || MArch->Name[1] != 0) // not CBE + OutputFilename += ".s"; + else + OutputFilename += ".cbe.c"; + break; + case TargetMachine::ObjectFile: + OutputFilename += ".o"; + break; + case TargetMachine::DynamicLibrary: + OutputFilename += LTDL_SHLIB_EXT; + break; + } + + if (!Force && std::ifstream(OutputFilename.c_str())) { + // If force is not specified, make sure not to overwrite a file! + std::cerr << ProgName << ": error opening '" << OutputFilename + << "': file exists!\n" + << "Use -f command line argument to force output\n"; + return 0; + } + + // Make sure that the Out file gets unlinked from the disk if we get a + // SIGINT + sys::RemoveFileOnSignal(sys::Path(OutputFilename)); + + std::ostream *Out = new std::ofstream(OutputFilename.c_str()); + if (!Out->good()) { + std::cerr << ProgName << ": error opening " << OutputFilename << "!\n"; + delete Out; + return 0; + } + + return Out; +} // main - Entry point for the llc compiler. // int main(int argc, char **argv) { - cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n"); - + llvm_shutdown_obj X; // Call llvm_shutdown() on exit. + cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n"); + sys::PrintStackTraceOnErrorSignal(); + // Load the module to be compiled... - std::auto_ptr M(ParseBytecodeFile(InputFilename)); + std::string ErrorMessage; + std::auto_ptr M; + + std::auto_ptr Buffer( + MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)); + if (Buffer.get()) + M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage)); if (M.get() == 0) { - std::cerr << argv[0] << ": bytecode didn't read correctly.\n"; + std::cerr << argv[0] << ": bitcode didn't read correctly.\n"; + std::cerr << "Reason: " << ErrorMessage << "\n"; return 1; } Module &mod = *M.get(); - + + // If we are supposed to override the target triple, do so now. + if (!TargetTriple.empty()) + mod.setTargetTriple(TargetTriple); + // Allocate target machine. First, check whether the user has // explicitly specified an architecture to compile for. - unsigned Config = (mod.isLittleEndian() ? TM::LittleEndian : TM::BigEndian)| - (mod.has32BitPointers() ? TM::PtrSize32 : TM::PtrSize64); - TargetMachine* (*TargetMachineAllocator)(unsigned) = 0; - switch (Arch) { - case x86: - TargetMachineAllocator = allocateX86TargetMachine; - break; - case Sparc: - TargetMachineAllocator = allocateSparcTargetMachine; - break; - default: - // Decide what the default target machine should be, by looking at - // the module. This heuristic (ILP32, LE -> IA32; LP64, BE -> - // SPARCV9) is kind of gross, but it will work until we have more - // sophisticated target information to work from. - if (mod.isLittleEndian() && mod.has32BitPointers()) { - TargetMachineAllocator = allocateX86TargetMachine; - } else if (mod.isBigEndian() && mod.has64BitPointers()) { - TargetMachineAllocator = allocateSparcTargetMachine; - } else { - assert(0 && "You must specify -march; I could not guess the default"); - } - break; + 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; + } + } + + // Package up features to be passed to target/subtarget + std::string FeaturesStr; + if (MCPU.size() || MAttrs.size()) { + SubtargetFeatures Features; + Features.setCPU(MCPU); + for (unsigned i = 0; i != MAttrs.size(); ++i) + Features.AddFeature(MAttrs[i]); + FeaturesStr = Features.getString(); } - std::auto_ptr target((*TargetMachineAllocator)(Config)); + + std::auto_ptr target(MArch->CtorFn(mod, FeaturesStr)); 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 unlink'd from the disk if we get a - // SIGINT - RemoveFileOnSignal(OutputFilename); - } else { - Out = &std::cout; + std::ostream *Out = GetOutputStream(argv[0]); + if (Out == 0) return 1; + + // If this target requires addPassesToEmitWholeFile, do it now. This is + // used by strange things like the C backend. + if (Target.WantsWholeFile()) { + PassManager PM; + PM.add(new TargetData(*Target.getTargetData())); + if (!NoVerify) + PM.add(createVerifierPass()); + + // Ask the target to add backend passes as necessary. + if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, Fast)) { + std::cerr << argv[0] << ": target does not support generation of this" + << " file type!\n"; + if (Out != &std::cout) delete Out; + // And the Out file is empty and useless, so remove it now. + sys::Path(OutputFilename).eraseFromDisk(); + return 1; } + PM.run(mod); } else { - if (InputFilename == "-") { - OutputFilename = "-"; - Out = &std::cout; - } else { - OutputFilename = GetFileNameRoot(InputFilename); - OutputFilename += ".s"; - - 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 unlink'd from the disk if we get a - // SIGINT - RemoveFileOnSignal(OutputFilename); + // Build up all of the passes that we want to do to the module. + FunctionPassManager Passes(new ExistingModuleProvider(M.get())); + Passes.add(new TargetData(*Target.getTargetData())); + +#ifndef NDEBUG + if (!NoVerify) + Passes.add(createVerifierPass()); +#endif + + // Ask the target to add backend passes as necessary. + MachineCodeEmitter *MCE = 0; + + switch (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) { + default: + assert(0 && "Invalid file model!"); + return 1; + case FileModel::Error: + std::cerr << argv[0] << ": target does not support generation of this" + << " file type!\n"; + if (Out != &std::cout) delete Out; + // And the Out file is empty and useless, so remove it now. + sys::Path(OutputFilename).eraseFromDisk(); + return 1; + case FileModel::AsmFile: + break; + case FileModel::MachOFile: + MCE = AddMachOWriter(Passes, *Out, Target); + break; + case FileModel::ElfFile: + MCE = AddELFWriter(Passes, *Out, Target); + break; } - } - // 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 { + if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) { + std::cerr << argv[0] << ": target does not support generation of this" + << " file type!\n"; + if (Out != &std::cout) delete Out; + // And the Out file is empty and useless, so remove it now. + sys::Path(OutputFilename).eraseFromDisk(); + return 1; + } + + Passes.doInitialization(); + // Run our queue of passes all at once now, efficiently. - Passes.run(*M.get()); + // TODO: this could lazily stream functions out of the module. + for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I) + if (!I->isDeclaration()) + Passes.run(*I); + + Passes.doFinalization(); } - + // Delete the ostream if it's not a stdout stream if (Out != &std::cout) delete Out;