text: //===-- CommandFlags.h - Command Line Flags Interface -----------*- C++ -*-===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // This file contains codegen-specific flags that are shared between different
  // command line tools. The tools "llc" and "opt" both use this file to prevent
  // flag duplication.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_CODEGEN_COMMANDFLAGS_H
  #define LLVM_CODEGEN_COMMANDFLAGS_H
  
  #include "llvm/MC/MCTargetOptionsCommandFlags.h"
  #include "llvm/Support/CodeGen.h"
  #include "llvm/Support/CommandLine.h"
  #include "llvm/Target/TargetMachine.h"
  #include "llvm/Target/TargetOptions.h"
  #include <string>
  using namespace llvm;
  
  cl::opt<std::string>
  MArch("march", cl::desc("Architecture to generate code for (see --version)"));
  
  cl::opt<std::string>
  MCPU("mcpu",
       cl::desc("Target a specific cpu type (-mcpu=help for details)"),
       cl::value_desc("cpu-name"),
       cl::init(""));
  
  cl::list<std::string>
  MAttrs("mattr",
         cl::CommaSeparated,
         cl::desc("Target specific attributes (-mattr=help for details)"),
         cl::value_desc("a1,+a2,-a3,..."));
  
  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));
  
  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));
  
  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>
  DisableRedZone("disable-red-zone",
                 cl::desc("Do not emit code that uses the red zone."),
                 cl::init(false));
  
  cl::opt<bool>
  EnableFPMAD("enable-fp-mad",
              cl::desc("Enable less precise MAD instructions to be generated"),
              cl::init(false));
  
  cl::opt<bool>
  DisableFPElim("disable-fp-elim",
                cl::desc("Disable frame pointer elimination optimization"),
                cl::init(false));
  
  cl::opt<bool>
  EnableUnsafeFPMath("enable-unsafe-fp-math",
                  cl::desc("Enable optimizations that may decrease FP precision"),
                  cl::init(false));
  
  cl::opt<bool>
  EnableNoInfsFPMath("enable-no-infs-fp-math",
                  cl::desc("Enable FP math optimizations that assume no +-Infs"),
                  cl::init(false));
  
  cl::opt<bool>
  EnableNoNaNsFPMath("enable-no-nans-fp-math",
                     cl::desc("Enable FP math optimizations that assume no NaNs"),
                     cl::init(false));
  
  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));
  
  cl::opt<bool>
  GenerateSoftFloatCalls("soft-float",
                      cl::desc("Generate software floating point library calls"),
                      cl::init(false));
  
  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));
  
  cl::opt<llvm::FPOpFusion::FPOpFusionMode>
  FuseFPOps("fp-contract",
            cl::desc("Enable aggressive 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));
  
  cl::opt<bool>
  DontPlaceZerosInBSS("nozero-initialized-in-bss",
                cl::desc("Don't place zero-initialized symbols into bss section"),
                cl::init(false));
  
  cl::opt<bool>
  EnableGuaranteedTailCallOpt("tailcallopt",
    cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
    cl::init(false));
  
  cl::opt<bool>
  DisableTailCalls("disable-tail-calls",
                   cl::desc("Never emit tail calls"),
                   cl::init(false));
  
  cl::opt<unsigned>
  OverrideStackAlignment("stack-alignment",
                         cl::desc("Override default stack alignment"),
                         cl::init(0));
  
  cl::opt<std::string>
  TrapFuncName("trap-func", cl::Hidden,
          cl::desc("Emit a call to trap function rather than a trap instruction"),
          cl::init(""));
  
  cl::opt<bool>
  EnablePIE("enable-pie",
            cl::desc("Assume the creation of a position independent executable."),
            cl::init(false));
  
  cl::opt<bool>
  UseInitArray("use-init-array",
               cl::desc("Use .init_array instead of .ctors."),
               cl::init(false));
  
  cl::opt<std::string> StopAfter("stop-after",
                              cl::desc("Stop compilation after a specific pass"),
                              cl::value_desc("pass-name"),
                                        cl::init(""));
  cl::opt<std::string> StartAfter("start-after",
                            cl::desc("Resume compilation after a specific pass"),
                            cl::value_desc("pass-name"),
                            cl::init(""));
  
  cl::opt<bool> DataSections("data-sections",
                             cl::desc("Emit data into separate sections"),
                             cl::init(false));
  
  cl::opt<bool>
  FunctionSections("function-sections",
                   cl::desc("Emit functions into separate sections"),
                   cl::init(false));
  
  cl::opt<llvm::JumpTable::JumpTableType>
  JTableType("jump-table-type",
            cl::desc("Choose the type of Jump-Instruction Table for jumptable."),
            cl::init(JumpTable::Single),
            cl::values(
                clEnumValN(JumpTable::Single, "single",
                           "Create a single table for all jumptable functions"),
                clEnumValN(JumpTable::Arity, "arity",
                           "Create one table per number of parameters."),
                clEnumValN(JumpTable::Simplified, "simplified",
                           "Create one table per simplified function type."),
                clEnumValN(JumpTable::Full, "full",
                           "Create one table per unique function type."),
                clEnumValEnd));
  
  // Common utility function tightly tied to the options listed here. Initializes
  // a TargetOptions object with CodeGen flags and returns it.
  static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
    TargetOptions Options;
    Options.LessPreciseFPMADOption = EnableFPMAD;
    Options.NoFramePointerElim = DisableFPElim;
    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.TrapFuncName = TrapFuncName;
    Options.PositionIndependentExecutable = EnablePIE;
    Options.UseInitArray = UseInitArray;
    Options.DataSections = DataSections;
    Options.FunctionSections = FunctionSections;
  
    Options.MCOptions = InitMCTargetOptionsFromFlags();
    Options.JTType = JTableType;
  
    return Options;
  }
  
  #endif
  