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+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file 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/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Assembly/PrintModulePass.h"
+#include "llvm/Support/IRReader.h"
+#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/MC/SubtargetFeature.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/ToolOutputFile.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/TargetSelect.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLibraryInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#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 bitcode>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
+
+// Determine optimization level.
+static cl::opt<char>
+OptLevel("O",
+ cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
+ "(default = '-O2')"),
+ cl::Prefix,
+ cl::ZeroOrMore,
+ cl::init(' '));
+
+static cl::opt<std::string>
+TargetTriple("mtriple", cl::desc("Override target triple for module"));
+
+static cl::opt<std::string>
+MArch("march", cl::desc("Architecture to generate code for (see --version)"));
+
+static cl::opt<std::string>
+MCPU("mcpu",
+ cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+ cl::value_desc("cpu-name"),
+ cl::init(""));
+
+static cl::list<std::string>
+MAttrs("mattr",
+ cl::CommaSeparated,
+ cl::desc("Target specific attributes (-mattr=help for details)"),
+ cl::value_desc("a1,+a2,-a3,..."));
+
+static cl::opt<Reloc::Model>
+RelocModel("relocation-model",
+ cl::desc("Choose relocation model"),
+ cl::init(Reloc::Default),
+ cl::values(
+ clEnumValN(Reloc::Default, "default",
+ "Target default relocation model"),
+ clEnumValN(Reloc::Static, "static",
+ "Non-relocatable code"),
+ clEnumValN(Reloc::PIC_, "pic",
+ "Fully relocatable, position independent code"),
+ clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
+ "Relocatable external references, non-relocatable code"),
+ clEnumValEnd));
+
+static cl::opt<llvm::CodeModel::Model>
+CMModel("code-model",
+ cl::desc("Choose code model"),
+ cl::init(CodeModel::Default),
+ cl::values(clEnumValN(CodeModel::Default, "default",
+ "Target default code model"),
+ clEnumValN(CodeModel::Small, "small",
+ "Small code model"),
+ clEnumValN(CodeModel::Kernel, "kernel",
+ "Kernel code model"),
+ clEnumValN(CodeModel::Medium, "medium",
+ "Medium code model"),
+ clEnumValN(CodeModel::Large, "large",
+ "Large code model"),
+ clEnumValEnd));
+
+static cl::opt<bool>
+RelaxAll("mc-relax-all",
+ cl::desc("When used with filetype=obj, "
+ "relax all fixups in the emitted object file"));
+
+cl::opt<TargetMachine::CodeGenFileType>
+FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
+ cl::desc("Choose a file type (not all types are supported by all targets):"),
+ cl::values(
+ clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm",
+ "Emit an assembly ('.s') file"),
+ clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
+ "Emit a native object ('.o') file"),
+ clEnumValN(TargetMachine::CGFT_Null, "null",
+ "Emit nothing, for performance testing"),
+ clEnumValEnd));
+
+cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
+ cl::desc("Do not verify input module"));
+
+cl::opt<bool> DisableDotLoc("disable-dot-loc", cl::Hidden,
+ cl::desc("Do not use .loc entries"));
+
+cl::opt<bool> DisableCFI("disable-cfi", cl::Hidden,
+ cl::desc("Do not use .cfi_* directives"));
+
+cl::opt<bool> EnableDwarfDirectory("enable-dwarf-directory", cl::Hidden,
+ cl::desc("Use .file directives with an explicit directory."));
+
+static cl::opt<bool>
+DisableRedZone("disable-red-zone",
+ cl::desc("Do not emit code that uses the red zone."),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableFPMAD("enable-fp-mad",
+ cl::desc("Enable less precise MAD instructions to be generated"),
+ cl::init(false));
+
+static cl::opt<bool>
+DisableFPElim("disable-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization"),
+ cl::init(false));
+
+static cl::opt<bool>
+DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableUnsafeFPMath("enable-unsafe-fp-math",
+ cl::desc("Enable optimizations that may decrease FP precision"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableNoInfsFPMath("enable-no-infs-fp-math",
+ cl::desc("Enable FP math optimizations that assume no +-Infs"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableNoNaNsFPMath("enable-no-nans-fp-math",
+ cl::desc("Enable FP math optimizations that assume no NaNs"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
+ cl::Hidden,
+ cl::desc("Force codegen to assume rounding mode can change dynamically"),
+ cl::init(false));
+
+static cl::opt<bool>
+GenerateSoftFloatCalls("soft-float",
+ cl::desc("Generate software floating point library calls"),
+ cl::init(false));
+
+static cl::opt<llvm::FloatABI::ABIType>
+FloatABIForCalls("float-abi",
+ cl::desc("Choose float ABI type"),
+ cl::init(FloatABI::Default),
+ cl::values(
+ clEnumValN(FloatABI::Default, "default",
+ "Target default float ABI type"),
+ clEnumValN(FloatABI::Soft, "soft",
+ "Soft float ABI (implied by -soft-float)"),
+ clEnumValN(FloatABI::Hard, "hard",
+ "Hard float ABI (uses FP registers)"),
+ clEnumValEnd));
+
+static cl::opt<llvm::FPOpFusion::FPOpFusionMode>
+FuseFPOps("fp-contract",
+ cl::desc("Enable aggresive formation of fused FP ops"),
+ cl::init(FPOpFusion::Standard),
+ cl::values(
+ clEnumValN(FPOpFusion::Fast, "fast",
+ "Fuse FP ops whenever profitable"),
+ clEnumValN(FPOpFusion::Standard, "on",
+ "Only fuse 'blessed' FP ops."),
+ clEnumValN(FPOpFusion::Strict, "off",
+ "Only fuse FP ops when the result won't be effected."),
+ clEnumValEnd));
+
+static cl::opt<bool>
+DontPlaceZerosInBSS("nozero-initialized-in-bss",
+ cl::desc("Don't place zero-initialized symbols into bss section"),
+ cl::init(false));
+
+static cl::opt<bool>
+DisableSimplifyLibCalls("disable-simplify-libcalls",
+ cl::desc("Disable simplify-libcalls"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableGuaranteedTailCallOpt("tailcallopt",
+ cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
+ cl::init(false));
+
+static cl::opt<bool>
+DisableTailCalls("disable-tail-calls",
+ cl::desc("Never emit tail calls"),
+ cl::init(false));
+
+static cl::opt<unsigned>
+OverrideStackAlignment("stack-alignment",
+ cl::desc("Override default stack alignment"),
+ cl::init(0));
+
+static cl::opt<bool>
+EnableRealignStack("realign-stack",
+ cl::desc("Realign stack if needed"),
+ cl::init(true));
+
+static cl::opt<std::string>
+TrapFuncName("trap-func", cl::Hidden,
+ cl::desc("Emit a call to trap function rather than a trap instruction"),
+ cl::init(""));
+
+static cl::opt<bool>
+EnablePIE("enable-pie",
+ cl::desc("Assume the creation of a position independent executable."),
+ cl::init(false));
+
+static cl::opt<bool>
+SegmentedStacks("segmented-stacks",
+ cl::desc("Use segmented stacks if possible."),
+ cl::init(false));
+
+static cl::opt<bool>
+UseInitArray("use-init-array",
+ cl::desc("Use .init_array instead of .ctors."),
+ cl::init(false));
+
+static cl::opt<std::string> StopAfter("stop-after",
+ cl::desc("Stop compilation after a specific pass"),
+ cl::value_desc("pass-name"),
+ cl::init(""));
+static cl::opt<std::string> StartAfter("start-after",
+ cl::desc("Resume compilation after a specific pass"),
+ cl::value_desc("pass-name"),
+ cl::init(""));
+
+// 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') ||
+ (IFN[Len-2] == 'l' && IFN[Len-1] == 'l'))) {
+ outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
+ } else {
+ outputFilename = IFN;
+ }
+ return outputFilename;
+}
+
+static tool_output_file *GetOutputStream(const char *TargetName,
+ Triple::OSType OS,
+ const char *ProgName) {
+ // If we don't yet have an output filename, make one.
+ if (OutputFilename.empty()) {
+ if (InputFilename == "-")
+ OutputFilename = "-";
+ else {
+ OutputFilename = GetFileNameRoot(InputFilename);
+
+ switch (FileType) {
+ case TargetMachine::CGFT_AssemblyFile:
+ if (TargetName[0] == 'c') {
+ if (TargetName[1] == 0)
+ OutputFilename += ".cbe.c";
+ else if (TargetName[1] == 'p' && TargetName[2] == 'p')
+ OutputFilename += ".cpp";
+ else
+ OutputFilename += ".s";
+ } else
+ OutputFilename += ".s";
+ break;
+ case TargetMachine::CGFT_ObjectFile:
+ if (OS == Triple::Win32)
+ OutputFilename += ".obj";
+ else
+ OutputFilename += ".o";
+ break;
+ case TargetMachine::CGFT_Null:
+ OutputFilename += ".null";
+ break;
+ }
+ }
+ }
+
+ // Decide if we need "binary" output.
+ bool Binary = false;
+ switch (FileType) {
+ case TargetMachine::CGFT_AssemblyFile:
+ break;
+ case TargetMachine::CGFT_ObjectFile:
+ case TargetMachine::CGFT_Null:
+ Binary = true;
+ break;
+ }
+
+ // Open the file.
+ std::string error;
+ unsigned OpenFlags = 0;
+ if (Binary) OpenFlags |= raw_fd_ostream::F_Binary;
+ tool_output_file *FDOut = new tool_output_file(OutputFilename.c_str(), error,
+ OpenFlags);
+ if (!error.empty()) {
+ errs() << error << '\n';
+ delete FDOut;
+ return 0;
+ }
+
+ return FDOut;
+}
+
+// main - Entry point for the llc compiler.
+//
+int main(int argc, char **argv) {
+ sys::PrintStackTraceOnErrorSignal();
+ PrettyStackTraceProgram X(argc, argv);
+
+ // Enable debug stream buffering.
+ EnableDebugBuffering = true;
+
+ LLVMContext &Context = getGlobalContext();
+ llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
+
+ // Initialize targets first, so that --version shows registered targets.
+ InitializeAllTargets();
+ InitializeAllTargetMCs();
+ InitializeAllAsmPrinters();
+ InitializeAllAsmParsers();
+
+ // Initialize codegen and IR passes used by llc so that the -print-after,
+ // -print-before, and -stop-after options work.
+ PassRegistry *Registry = PassRegistry::getPassRegistry();
+ initializeCore(*Registry);
+ initializeCodeGen(*Registry);
+ initializeLoopStrengthReducePass(*Registry);
+ initializeLowerIntrinsicsPass(*Registry);
+ initializeUnreachableBlockElimPass(*Registry);
+
+ // Register the target printer for --version.
+ cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
+
+ cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
+
+ // Load the module to be compiled...
+ SMDiagnostic Err;
+ std::auto_ptr<Module> M;
+ Module *mod = 0;
+ Triple TheTriple;
+
+ bool SkipModule = MCPU == "help" ||
+ (!MAttrs.empty() && MAttrs.front() == "help");
+
+ // If user just wants to list available options, skip module loading
+ if (!SkipModule) {
+ M.reset(ParseIRFile(InputFilename, Err, Context));
+ mod = M.get();
+ if (mod == 0) {
+ Err.print(argv[0], errs());
+ return 1;
+ }
+
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ mod->setTargetTriple(Triple::normalize(TargetTriple));
+ TheTriple = Triple(mod->getTargetTriple());
+ } else {
+ TheTriple = Triple(Triple::normalize(TargetTriple));
+ }
+
+ if (TheTriple.getTriple().empty())
+ TheTriple.setTriple(sys::getDefaultTargetTriple());
+
+ // Get the target specific parser.
+ std::string Error;
+ const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
+ Error);
+ if (!TheTarget) {
+ errs() << argv[0] << ": " << Error;
+ return 1;
+ }
+
+ // Package up features to be passed to target/subtarget
+ std::string FeaturesStr;
+ if (MAttrs.size()) {
+ SubtargetFeatures Features;
+ for (unsigned i = 0; i != MAttrs.size(); ++i)
+ Features.AddFeature(MAttrs[i]);
+ FeaturesStr = Features.getString();
+ }
+
+ CodeGenOpt::Level OLvl = CodeGenOpt::Default;
+ switch (OptLevel) {
+ default:
+ errs() << argv[0] << ": invalid optimization level.\n";
+ return 1;
+ case ' ': break;
+ case '0': OLvl = CodeGenOpt::None; break;
+ case '1': OLvl = CodeGenOpt::Less; break;
+ case '2': OLvl = CodeGenOpt::Default; break;
+ case '3': OLvl = CodeGenOpt::Aggressive; break;
+ }
+
+ TargetOptions Options;
+ Options.LessPreciseFPMADOption = EnableFPMAD;
+ Options.NoFramePointerElim = DisableFPElim;
+ Options.NoFramePointerElimNonLeaf = DisableFPElimNonLeaf;
+ Options.AllowFPOpFusion = FuseFPOps;
+ Options.UnsafeFPMath = EnableUnsafeFPMath;
+ Options.NoInfsFPMath = EnableNoInfsFPMath;
+ Options.NoNaNsFPMath = EnableNoNaNsFPMath;
+ Options.HonorSignDependentRoundingFPMathOption =
+ EnableHonorSignDependentRoundingFPMath;
+ Options.UseSoftFloat = GenerateSoftFloatCalls;
+ if (FloatABIForCalls != FloatABI::Default)
+ Options.FloatABIType = FloatABIForCalls;
+ Options.NoZerosInBSS = DontPlaceZerosInBSS;
+ Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
+ Options.DisableTailCalls = DisableTailCalls;
+ Options.StackAlignmentOverride = OverrideStackAlignment;
+ Options.RealignStack = EnableRealignStack;
+ Options.TrapFuncName = TrapFuncName;
+ Options.PositionIndependentExecutable = EnablePIE;
+ Options.EnableSegmentedStacks = SegmentedStacks;
+ Options.UseInitArray = UseInitArray;
+
+ std::auto_ptr<TargetMachine>
+ target(TheTarget->createTargetMachine(TheTriple.getTriple(),
+ MCPU, FeaturesStr, Options,
+ RelocModel, CMModel, OLvl));
+ assert(target.get() && "Could not allocate target machine!");
+ assert(mod && "Should have exited after outputting help!");
+ TargetMachine &Target = *target.get();
+
+ if (DisableDotLoc)
+ Target.setMCUseLoc(false);
+
+ if (DisableCFI)
+ Target.setMCUseCFI(false);
+
+ if (EnableDwarfDirectory)
+ Target.setMCUseDwarfDirectory(true);
+
+ if (GenerateSoftFloatCalls)
+ FloatABIForCalls = FloatABI::Soft;
+
+ // Disable .loc support for older OS X versions.
+ if (TheTriple.isMacOSX() &&
+ TheTriple.isMacOSXVersionLT(10, 6))
+ Target.setMCUseLoc(false);
+
+ // Figure out where we are going to send the output.
+ OwningPtr<tool_output_file> Out
+ (GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]));
+ if (!Out) return 1;
+
+ // Build up all of the passes that we want to do to the module.
+ PassManager PM;
+
+ // Add an appropriate TargetLibraryInfo pass for the module's triple.
+ TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
+ if (DisableSimplifyLibCalls)
+ TLI->disableAllFunctions();
+ PM.add(TLI);
+
+ // Add the target data from the target machine, if it exists, or the module.
+ if (const TargetData *TD = Target.getTargetData())
+ PM.add(new TargetData(*TD));
+ else
+ PM.add(new TargetData(mod));
+
+ // Override default to generate verbose assembly.
+ Target.setAsmVerbosityDefault(true);
+
+ if (RelaxAll) {
+ if (FileType != TargetMachine::CGFT_ObjectFile)
+ errs() << argv[0]
+ << ": warning: ignoring -mc-relax-all because filetype != obj";
+ else
+ Target.setMCRelaxAll(true);
+ }
+
+ {
+ formatted_raw_ostream FOS(Out->os());
+
+ AnalysisID StartAfterID = 0;
+ AnalysisID StopAfterID = 0;
+ const PassRegistry *PR = PassRegistry::getPassRegistry();
+ if (!StartAfter.empty()) {
+ const PassInfo *PI = PR->getPassInfo(StartAfter);
+ if (!PI) {
+ errs() << argv[0] << ": start-after pass is not registered.\n";
+ return 1;
+ }
+ StartAfterID = PI->getTypeInfo();
+ }
+ if (!StopAfter.empty()) {
+ const PassInfo *PI = PR->getPassInfo(StopAfter);
+ if (!PI) {
+ errs() << argv[0] << ": stop-after pass is not registered.\n";
+ return 1;
+ }
+ StopAfterID = PI->getTypeInfo();
+ }
+
+ // Ask the target to add backend passes as necessary.
+ if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify,
+ StartAfterID, StopAfterID)) {
+ errs() << argv[0] << ": target does not support generation of this"
+ << " file type!\n";
+ return 1;
+ }
+
+ // Before executing passes, print the final values of the LLVM options.
+ cl::PrintOptionValues();
+
+ PM.run(*mod);
+ }
+
+ // Declare success.
+ Out->keep();
+
+ return 0;
+}
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