llvm/lib/CodeGen/CommandFlags.cpp

   1 //===-- CommandFlags.cpp - Command Line Flags Interface ---------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains codegen-specific flags that are shared between different
  10 // command line tools. The tools "llc" and "opt" both use this file to prevent
  11 // flag duplication.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/CodeGen/CommandFlags.h"
  16 #include "llvm/IR/Module.h"
  17 #include "llvm/MC/SubtargetFeature.h"
  18 #include "llvm/Support/CommandLine.h"
  19 #include "llvm/Support/Host.h"
  20 #include "llvm/Support/MemoryBuffer.h"
  21
  22 using namespace llvm;
  23
  24 #define CGOPT(TY, NAME)                                                        \
  25   static cl::opt<TY> *NAME##View;                                              \
  26   TY codegen::get##NAME() {                                                    \
  27     assert(NAME##View && "RegisterCodeGenFlags not created.");                 \
  28     return *NAME##View;                                                        \
  29   }
  30
  31 #define CGLIST(TY, NAME)                                                       \
  32   static cl::list<TY> *NAME##View;                                             \
  33   std::vector<TY> codegen::get##NAME() {                                       \
  34     assert(NAME##View && "RegisterCodeGenFlags not created.");                 \
  35     return *NAME##View;                                                        \
  36   }
  37
  38 #define CGOPT_EXP(TY, NAME)                                                    \
  39   CGOPT(TY, NAME)                                                              \
  40   Optional<TY> codegen::getExplicit##NAME() {                                  \
  41     if (NAME##View->getNumOccurrences()) {                                     \
  42       TY res = *NAME##View;                                                    \
  43       return res;                                                              \
  44     }                                                                          \
  45     return None;                                                               \
  46   }
  47
  48 CGOPT(std::string, MArch)
  49 CGOPT(std::string, MCPU)
  50 CGLIST(std::string, MAttrs)
  51 CGOPT_EXP(Reloc::Model, RelocModel)
  52 CGOPT(ThreadModel::Model, ThreadModel)
  53 CGOPT_EXP(CodeModel::Model, CodeModel)
  54 CGOPT(ExceptionHandling, ExceptionModel)
  55 CGOPT_EXP(CodeGenFileType, FileType)
  56 CGOPT(FramePointerKind, FramePointerUsage)
  57 CGOPT(bool, EnableUnsafeFPMath)
  58 CGOPT(bool, EnableNoInfsFPMath)
  59 CGOPT(bool, EnableNoNaNsFPMath)
  60 CGOPT(bool, EnableNoSignedZerosFPMath)
  61 CGOPT(bool, EnableNoTrappingFPMath)
  62 CGOPT(bool, EnableAIXExtendedAltivecABI)
  63 CGOPT(DenormalMode::DenormalModeKind, DenormalFPMath)
  64 CGOPT(DenormalMode::DenormalModeKind, DenormalFP32Math)
  65 CGOPT(bool, EnableHonorSignDependentRoundingFPMath)
  66 CGOPT(FloatABI::ABIType, FloatABIForCalls)
  67 CGOPT(FPOpFusion::FPOpFusionMode, FuseFPOps)
  68 CGOPT(bool, DontPlaceZerosInBSS)
  69 CGOPT(bool, EnableGuaranteedTailCallOpt)
  70 CGOPT(bool, DisableTailCalls)
  71 CGOPT(bool, StackSymbolOrdering)
  72 CGOPT(bool, StackRealign)
  73 CGOPT(std::string, TrapFuncName)
  74 CGOPT(bool, UseCtors)
  75 CGOPT(bool, RelaxELFRelocations)
  76 CGOPT_EXP(bool, DataSections)
  77 CGOPT_EXP(bool, FunctionSections)
  78 CGOPT(bool, IgnoreXCOFFVisibility)
  79 CGOPT(bool, XCOFFTracebackTable)
  80 CGOPT(std::string, BBSections)
  81 CGOPT(unsigned, TLSSize)
  82 CGOPT(bool, EmulatedTLS)
  83 CGOPT(bool, UniqueSectionNames)
  84 CGOPT(bool, UniqueBasicBlockSectionNames)
  85 CGOPT(EABI, EABIVersion)
  86 CGOPT(DebuggerKind, DebuggerTuningOpt)
  87 CGOPT(bool, EnableStackSizeSection)
  88 CGOPT(bool, EnableAddrsig)
  89 CGOPT(bool, EmitCallSiteInfo)
  90 CGOPT(bool, EnableMachineFunctionSplitter)
  91 CGOPT(bool, EnableDebugEntryValues)
  92 CGOPT(bool, PseudoProbeForProfiling)
  93 CGOPT(bool, ValueTrackingVariableLocations)
  94 CGOPT(bool, ForceDwarfFrameSection)
  95 CGOPT(bool, XRayOmitFunctionIndex)
  96 CGOPT(bool, DebugStrictDwarf)
  97 CGOPT(unsigned, AlignLoops)
  98
  99 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
 100 #define CGBINDOPT(NAME)                                                        \
 101   do {                                                                         \
 102     NAME##View = std::addressof(NAME);                                         \
 103   } while (0)
 104
 105   static cl::opt<std::string> MArch(
 106       "march", cl::desc("Architecture to generate code for (see --version)"));
 107   CGBINDOPT(MArch);
 108
 109   static cl::opt<std::string> MCPU(
 110       "mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"),
 111       cl::value_desc("cpu-name"), cl::init(""));
 112   CGBINDOPT(MCPU);
 113
 114   static cl::list<std::string> MAttrs(
 115       "mattr", cl::CommaSeparated,
 116       cl::desc("Target specific attributes (-mattr=help for details)"),
 117       cl::value_desc("a1,+a2,-a3,..."));
 118   CGBINDOPT(MAttrs);
 119
 120   static cl::opt<Reloc::Model> RelocModel(
 121       "relocation-model", cl::desc("Choose relocation model"),
 122       cl::values(
 123           clEnumValN(Reloc::Static, "static", "Non-relocatable code"),
 124           clEnumValN(Reloc::PIC_, "pic",
 125                      "Fully relocatable, position independent code"),
 126           clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
 127                      "Relocatable external references, non-relocatable code"),
 128           clEnumValN(
 129               Reloc::ROPI, "ropi",
 130               "Code and read-only data relocatable, accessed PC-relative"),
 131           clEnumValN(
 132               Reloc::RWPI, "rwpi",
 133               "Read-write data relocatable, accessed relative to static base"),
 134           clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi",
 135                      "Combination of ropi and rwpi")));
 136   CGBINDOPT(RelocModel);
 137
 138   static cl::opt<ThreadModel::Model> ThreadModel(
 139       "thread-model", cl::desc("Choose threading model"),
 140       cl::init(ThreadModel::POSIX),
 141       cl::values(
 142           clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"),
 143           clEnumValN(ThreadModel::Single, "single", "Single thread model")));
 144   CGBINDOPT(ThreadModel);
 145
 146   static cl::opt<CodeModel::Model> CodeModel(
 147       "code-model", cl::desc("Choose code model"),
 148       cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"),
 149                  clEnumValN(CodeModel::Small, "small", "Small code model"),
 150                  clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"),
 151                  clEnumValN(CodeModel::Medium, "medium", "Medium code model"),
 152                  clEnumValN(CodeModel::Large, "large", "Large code model")));
 153   CGBINDOPT(CodeModel);
 154
 155   static cl::opt<ExceptionHandling> ExceptionModel(
 156       "exception-model", cl::desc("exception model"),
 157       cl::init(ExceptionHandling::None),
 158       cl::values(
 159           clEnumValN(ExceptionHandling::None, "default",
 160                      "default exception handling model"),
 161           clEnumValN(ExceptionHandling::DwarfCFI, "dwarf",
 162                      "DWARF-like CFI based exception handling"),
 163           clEnumValN(ExceptionHandling::SjLj, "sjlj",
 164                      "SjLj exception handling"),
 165           clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"),
 166           clEnumValN(ExceptionHandling::WinEH, "wineh",
 167                      "Windows exception model"),
 168           clEnumValN(ExceptionHandling::Wasm, "wasm",
 169                      "WebAssembly exception handling")));
 170   CGBINDOPT(ExceptionModel);
 171
 172   static cl::opt<CodeGenFileType> FileType(
 173       "filetype", cl::init(CGFT_AssemblyFile),
 174       cl::desc(
 175           "Choose a file type (not all types are supported by all targets):"),
 176       cl::values(
 177           clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"),
 178           clEnumValN(CGFT_ObjectFile, "obj",
 179                      "Emit a native object ('.o') file"),
 180           clEnumValN(CGFT_Null, "null",
 181                      "Emit nothing, for performance testing")));
 182   CGBINDOPT(FileType);
 183
 184   static cl::opt<FramePointerKind> FramePointerUsage(
 185       "frame-pointer",
 186       cl::desc("Specify frame pointer elimination optimization"),
 187       cl::init(FramePointerKind::None),
 188       cl::values(
 189           clEnumValN(FramePointerKind::All, "all",
 190                      "Disable frame pointer elimination"),
 191           clEnumValN(FramePointerKind::NonLeaf, "non-leaf",
 192                      "Disable frame pointer elimination for non-leaf frame"),
 193           clEnumValN(FramePointerKind::None, "none",
 194                      "Enable frame pointer elimination")));
 195   CGBINDOPT(FramePointerUsage);
 196
 197   static cl::opt<bool> EnableUnsafeFPMath(
 198       "enable-unsafe-fp-math",
 199       cl::desc("Enable optimizations that may decrease FP precision"),
 200       cl::init(false));
 201   CGBINDOPT(EnableUnsafeFPMath);
 202
 203   static cl::opt<bool> EnableNoInfsFPMath(
 204       "enable-no-infs-fp-math",
 205       cl::desc("Enable FP math optimizations that assume no +-Infs"),
 206       cl::init(false));
 207   CGBINDOPT(EnableNoInfsFPMath);
 208
 209   static cl::opt<bool> EnableNoNaNsFPMath(
 210       "enable-no-nans-fp-math",
 211       cl::desc("Enable FP math optimizations that assume no NaNs"),
 212       cl::init(false));
 213   CGBINDOPT(EnableNoNaNsFPMath);
 214
 215   static cl::opt<bool> EnableNoSignedZerosFPMath(
 216       "enable-no-signed-zeros-fp-math",
 217       cl::desc("Enable FP math optimizations that assume "
 218                "the sign of 0 is insignificant"),
 219       cl::init(false));
 220   CGBINDOPT(EnableNoSignedZerosFPMath);
 221
 222   static cl::opt<bool> EnableNoTrappingFPMath(
 223       "enable-no-trapping-fp-math",
 224       cl::desc("Enable setting the FP exceptions build "
 225                "attribute not to use exceptions"),
 226       cl::init(false));
 227   CGBINDOPT(EnableNoTrappingFPMath);
 228
 229   static const auto DenormFlagEnumOptions =
 230   cl::values(clEnumValN(DenormalMode::IEEE, "ieee",
 231                         "IEEE 754 denormal numbers"),
 232              clEnumValN(DenormalMode::PreserveSign, "preserve-sign",
 233                         "the sign of a  flushed-to-zero number is preserved "
 234                         "in the sign of 0"),
 235              clEnumValN(DenormalMode::PositiveZero, "positive-zero",
 236                         "denormals are flushed to positive zero"));
 237
 238   // FIXME: Doesn't have way to specify separate input and output modes.
 239   static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath(
 240     "denormal-fp-math",
 241     cl::desc("Select which denormal numbers the code is permitted to require"),
 242     cl::init(DenormalMode::IEEE),
 243     DenormFlagEnumOptions);
 244   CGBINDOPT(DenormalFPMath);
 245
 246   static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math(
 247     "denormal-fp-math-f32",
 248     cl::desc("Select which denormal numbers the code is permitted to require for float"),
 249     cl::init(DenormalMode::Invalid),
 250     DenormFlagEnumOptions);
 251   CGBINDOPT(DenormalFP32Math);
 252
 253   static cl::opt<bool> EnableHonorSignDependentRoundingFPMath(
 254       "enable-sign-dependent-rounding-fp-math", cl::Hidden,
 255       cl::desc("Force codegen to assume rounding mode can change dynamically"),
 256       cl::init(false));
 257   CGBINDOPT(EnableHonorSignDependentRoundingFPMath);
 258
 259   static cl::opt<FloatABI::ABIType> FloatABIForCalls(
 260       "float-abi", cl::desc("Choose float ABI type"),
 261       cl::init(FloatABI::Default),
 262       cl::values(clEnumValN(FloatABI::Default, "default",
 263                             "Target default float ABI type"),
 264                  clEnumValN(FloatABI::Soft, "soft",
 265                             "Soft float ABI (implied by -soft-float)"),
 266                  clEnumValN(FloatABI::Hard, "hard",
 267                             "Hard float ABI (uses FP registers)")));
 268   CGBINDOPT(FloatABIForCalls);
 269
 270   static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps(
 271       "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"),
 272       cl::init(FPOpFusion::Standard),
 273       cl::values(
 274           clEnumValN(FPOpFusion::Fast, "fast",
 275                      "Fuse FP ops whenever profitable"),
 276           clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."),
 277           clEnumValN(FPOpFusion::Strict, "off",
 278                      "Only fuse FP ops when the result won't be affected.")));
 279   CGBINDOPT(FuseFPOps);
 280
 281   static cl::opt<bool> DontPlaceZerosInBSS(
 282       "nozero-initialized-in-bss",
 283       cl::desc("Don't place zero-initialized symbols into bss section"),
 284       cl::init(false));
 285   CGBINDOPT(DontPlaceZerosInBSS);
 286
 287   static cl::opt<bool> EnableAIXExtendedAltivecABI(
 288       "vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."),
 289       cl::init(false));
 290   CGBINDOPT(EnableAIXExtendedAltivecABI);
 291
 292   static cl::opt<bool> EnableGuaranteedTailCallOpt(
 293       "tailcallopt",
 294       cl::desc(
 295           "Turn fastcc calls into tail calls by (potentially) changing ABI."),
 296       cl::init(false));
 297   CGBINDOPT(EnableGuaranteedTailCallOpt);
 298
 299   static cl::opt<bool> DisableTailCalls(
 300       "disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false));
 301   CGBINDOPT(DisableTailCalls);
 302
 303   static cl::opt<bool> StackSymbolOrdering(
 304       "stack-symbol-ordering", cl::desc("Order local stack symbols."),
 305       cl::init(true));
 306   CGBINDOPT(StackSymbolOrdering);
 307
 308   static cl::opt<bool> StackRealign(
 309       "stackrealign",
 310       cl::desc("Force align the stack to the minimum alignment"),
 311       cl::init(false));
 312   CGBINDOPT(StackRealign);
 313
 314   static cl::opt<std::string> TrapFuncName(
 315       "trap-func", cl::Hidden,
 316       cl::desc("Emit a call to trap function rather than a trap instruction"),
 317       cl::init(""));
 318   CGBINDOPT(TrapFuncName);
 319
 320   static cl::opt<bool> UseCtors("use-ctors",
 321                                 cl::desc("Use .ctors instead of .init_array."),
 322                                 cl::init(false));
 323   CGBINDOPT(UseCtors);
 324
 325   static cl::opt<bool> RelaxELFRelocations(
 326       "relax-elf-relocations",
 327       cl::desc(
 328           "Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"),
 329       cl::init(false));
 330   CGBINDOPT(RelaxELFRelocations);
 331
 332   static cl::opt<bool> DataSections(
 333       "data-sections", cl::desc("Emit data into separate sections"),
 334       cl::init(false));
 335   CGBINDOPT(DataSections);
 336
 337   static cl::opt<bool> FunctionSections(
 338       "function-sections", cl::desc("Emit functions into separate sections"),
 339       cl::init(false));
 340   CGBINDOPT(FunctionSections);
 341
 342   static cl::opt<bool> IgnoreXCOFFVisibility(
 343       "ignore-xcoff-visibility",
 344       cl::desc("Not emit the visibility attribute for asm in AIX OS or give "
 345                "all symbols 'unspecified' visibility in XCOFF object file"),
 346       cl::init(false));
 347   CGBINDOPT(IgnoreXCOFFVisibility);
 348
 349   static cl::opt<bool> XCOFFTracebackTable(
 350       "xcoff-traceback-table", cl::desc("Emit the XCOFF traceback table"),
 351       cl::init(true));
 352   CGBINDOPT(XCOFFTracebackTable);
 353
 354   static cl::opt<std::string> BBSections(
 355       "basic-block-sections",
 356       cl::desc("Emit basic blocks into separate sections"),
 357       cl::value_desc("all | <function list (file)> | labels | none"),
 358       cl::init("none"));
 359   CGBINDOPT(BBSections);
 360
 361   static cl::opt<unsigned> TLSSize(
 362       "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0));
 363   CGBINDOPT(TLSSize);
 364
 365   static cl::opt<bool> EmulatedTLS(
 366       "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false));
 367   CGBINDOPT(EmulatedTLS);
 368
 369   static cl::opt<bool> UniqueSectionNames(
 370       "unique-section-names", cl::desc("Give unique names to every section"),
 371       cl::init(true));
 372   CGBINDOPT(UniqueSectionNames);
 373
 374   static cl::opt<bool> UniqueBasicBlockSectionNames(
 375       "unique-basic-block-section-names",
 376       cl::desc("Give unique names to every basic block section"),
 377       cl::init(false));
 378   CGBINDOPT(UniqueBasicBlockSectionNames);
 379
 380   static cl::opt<EABI> EABIVersion(
 381       "meabi", cl::desc("Set EABI type (default depends on triple):"),
 382       cl::init(EABI::Default),
 383       cl::values(
 384           clEnumValN(EABI::Default, "default", "Triple default EABI version"),
 385           clEnumValN(EABI::EABI4, "4", "EABI version 4"),
 386           clEnumValN(EABI::EABI5, "5", "EABI version 5"),
 387           clEnumValN(EABI::GNU, "gnu", "EABI GNU")));
 388   CGBINDOPT(EABIVersion);
 389
 390   static cl::opt<DebuggerKind> DebuggerTuningOpt(
 391       "debugger-tune", cl::desc("Tune debug info for a particular debugger"),
 392       cl::init(DebuggerKind::Default),
 393       cl::values(
 394           clEnumValN(DebuggerKind::GDB, "gdb", "gdb"),
 395           clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"),
 396           clEnumValN(DebuggerKind::DBX, "dbx", "dbx"),
 397           clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)")));
 398   CGBINDOPT(DebuggerTuningOpt);
 399
 400   static cl::opt<bool> EnableStackSizeSection(
 401       "stack-size-section",
 402       cl::desc("Emit a section containing stack size metadata"),
 403       cl::init(false));
 404   CGBINDOPT(EnableStackSizeSection);
 405
 406   static cl::opt<bool> EnableAddrsig(
 407       "addrsig", cl::desc("Emit an address-significance table"),
 408       cl::init(false));
 409   CGBINDOPT(EnableAddrsig);
 410
 411   static cl::opt<bool> EmitCallSiteInfo(
 412       "emit-call-site-info",
 413       cl::desc(
 414           "Emit call site debug information, if debug information is enabled."),
 415       cl::init(false));
 416   CGBINDOPT(EmitCallSiteInfo);
 417
 418   static cl::opt<bool> EnableDebugEntryValues(
 419       "debug-entry-values",
 420       cl::desc("Enable debug info for the debug entry values."),
 421       cl::init(false));
 422   CGBINDOPT(EnableDebugEntryValues);
 423
 424   static cl::opt<bool> PseudoProbeForProfiling(
 425       "pseudo-probe-for-profiling", cl::desc("Emit pseudo probes for AutoFDO"),
 426       cl::init(false));
 427   CGBINDOPT(PseudoProbeForProfiling);
 428
 429   static cl::opt<bool> ValueTrackingVariableLocations(
 430       "experimental-debug-variable-locations",
 431       cl::desc("Use experimental new value-tracking variable locations"),
 432       cl::init(false));
 433   CGBINDOPT(ValueTrackingVariableLocations);
 434
 435   static cl::opt<bool> EnableMachineFunctionSplitter(
 436       "split-machine-functions",
 437       cl::desc("Split out cold basic blocks from machine functions based on "
 438                "profile information"),
 439       cl::init(false));
 440   CGBINDOPT(EnableMachineFunctionSplitter);
 441
 442   static cl::opt<bool> ForceDwarfFrameSection(
 443       "force-dwarf-frame-section",
 444       cl::desc("Always emit a debug frame section."), cl::init(false));
 445   CGBINDOPT(ForceDwarfFrameSection);
 446
 447   static cl::opt<bool> XRayOmitFunctionIndex(
 448       "no-xray-index", cl::desc("Don't emit xray_fn_idx section"),
 449       cl::init(false));
 450   CGBINDOPT(XRayOmitFunctionIndex);
 451
 452   static cl::opt<bool> DebugStrictDwarf(
 453       "strict-dwarf", cl::desc("use strict dwarf"), cl::init(false));
 454   CGBINDOPT(DebugStrictDwarf);
 455
 456   static cl::opt<unsigned> AlignLoops("align-loops",
 457                                       cl::desc("Default alignment for loops"));
 458   CGBINDOPT(AlignLoops);
 459
 460 #undef CGBINDOPT
 461
 462   mc::RegisterMCTargetOptionsFlags();
 463 }
 464
 465 llvm::BasicBlockSection
 466 codegen::getBBSectionsMode(llvm::TargetOptions &Options) {
 467   if (getBBSections() == "all")
 468     return BasicBlockSection::All;
 469   else if (getBBSections() == "labels")
 470     return BasicBlockSection::Labels;
 471   else if (getBBSections() == "none")
 472     return BasicBlockSection::None;
 473   else {
 474     ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
 475         MemoryBuffer::getFile(getBBSections());
 476     if (!MBOrErr) {
 477       errs() << "Error loading basic block sections function list file: "
 478              << MBOrErr.getError().message() << "\n";
 479     } else {
 480       Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
 481     }
 482     return BasicBlockSection::List;
 483   }
 484 }
 485
 486 // Common utility function tightly tied to the options listed here. Initializes
 487 // a TargetOptions object with CodeGen flags and returns it.
 488 TargetOptions
 489 codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
 490   TargetOptions Options;
 491   Options.AllowFPOpFusion = getFuseFPOps();
 492   Options.UnsafeFPMath = getEnableUnsafeFPMath();
 493   Options.NoInfsFPMath = getEnableNoInfsFPMath();
 494   Options.NoNaNsFPMath = getEnableNoNaNsFPMath();
 495   Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath();
 496   Options.NoTrappingFPMath = getEnableNoTrappingFPMath();
 497
 498   DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
 499
 500   // FIXME: Should have separate input and output flags
 501   Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind));
 502
 503   Options.HonorSignDependentRoundingFPMathOption =
 504       getEnableHonorSignDependentRoundingFPMath();
 505   if (getFloatABIForCalls() != FloatABI::Default)
 506     Options.FloatABIType = getFloatABIForCalls();
 507   Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI();
 508   Options.NoZerosInBSS = getDontPlaceZerosInBSS();
 509   Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt();
 510   Options.StackSymbolOrdering = getStackSymbolOrdering();
 511   Options.UseInitArray = !getUseCtors();
 512   Options.RelaxELFRelocations = getRelaxELFRelocations();
 513   Options.DataSections =
 514       getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections());
 515   Options.FunctionSections = getFunctionSections();
 516   Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility();
 517   Options.XCOFFTracebackTable = getXCOFFTracebackTable();
 518   Options.BBSections = getBBSectionsMode(Options);
 519   Options.UniqueSectionNames = getUniqueSectionNames();
 520   Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames();
 521   Options.TLSSize = getTLSSize();
 522   Options.EmulatedTLS = getEmulatedTLS();
 523   Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0;
 524   Options.ExceptionModel = getExceptionModel();
 525   Options.EmitStackSizeSection = getEnableStackSizeSection();
 526   Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter();
 527   Options.EmitAddrsig = getEnableAddrsig();
 528   Options.EmitCallSiteInfo = getEmitCallSiteInfo();
 529   Options.EnableDebugEntryValues = getEnableDebugEntryValues();
 530   Options.PseudoProbeForProfiling = getPseudoProbeForProfiling();
 531   Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations();
 532   Options.ForceDwarfFrameSection = getForceDwarfFrameSection();
 533   Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
 534   Options.DebugStrictDwarf = getDebugStrictDwarf();
 535   Options.LoopAlignment = getAlignLoops();
 536
 537   Options.MCOptions = mc::InitMCTargetOptionsFromFlags();
 538
 539   Options.ThreadModel = getThreadModel();
 540   Options.EABIVersion = getEABIVersion();
 541   Options.DebuggerTuning = getDebuggerTuningOpt();
 542
 543   return Options;
 544 }
 545
 546 std::string codegen::getCPUStr() {
 547   // If user asked for the 'native' CPU, autodetect here. If autodection fails,
 548   // this will set the CPU to an empty string which tells the target to
 549   // pick a basic default.
 550   if (getMCPU() == "native")
 551     return std::string(sys::getHostCPUName());
 552
 553   return getMCPU();
 554 }
 555
 556 std::string codegen::getFeaturesStr() {
 557   SubtargetFeatures Features;
 558
 559   // If user asked for the 'native' CPU, we need to autodetect features.
 560   // This is necessary for x86 where the CPU might not support all the
 561   // features the autodetected CPU name lists in the target. For example,
 562   // not all Sandybridge processors support AVX.
 563   if (getMCPU() == "native") {
 564     StringMap<bool> HostFeatures;
 565     if (sys::getHostCPUFeatures(HostFeatures))
 566       for (auto &F : HostFeatures)
 567         Features.AddFeature(F.first(), F.second);
 568   }
 569
 570   for (auto const &MAttr : getMAttrs())
 571     Features.AddFeature(MAttr);
 572
 573   return Features.getString();
 574 }
 575
 576 std::vector<std::string> codegen::getFeatureList() {
 577   SubtargetFeatures Features;
 578
 579   // If user asked for the 'native' CPU, we need to autodetect features.
 580   // This is necessary for x86 where the CPU might not support all the
 581   // features the autodetected CPU name lists in the target. For example,
 582   // not all Sandybridge processors support AVX.
 583   if (getMCPU() == "native") {
 584     StringMap<bool> HostFeatures;
 585     if (sys::getHostCPUFeatures(HostFeatures))
 586       for (auto &F : HostFeatures)
 587         Features.AddFeature(F.first(), F.second);
 588   }
 589
 590   for (auto const &MAttr : getMAttrs())
 591     Features.AddFeature(MAttr);
 592
 593   return Features.getFeatures();
 594 }
 595
 596 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) {
 597   B.addAttribute(Name, Val ? "true" : "false");
 598 }
 599
 600 #define HANDLE_BOOL_ATTR(CL, AttrName)                                         \
 601   do {                                                                         \
 602     if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName))            \
 603       renderBoolStringAttr(NewAttrs, AttrName, *CL);                           \
 604   } while (0)
 605
 606 /// Set function attributes of function \p F based on CPU, Features, and command
 607 /// line flags.
 608 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
 609                                     Function &F) {
 610   auto &Ctx = F.getContext();
 611   AttributeList Attrs = F.getAttributes();
 612   AttrBuilder NewAttrs;
 613
 614   if (!CPU.empty() && !F.hasFnAttribute("target-cpu"))
 615     NewAttrs.addAttribute("target-cpu", CPU);
 616   if (!Features.empty()) {
 617     // Append the command line features to any that are already on the function.
 618     StringRef OldFeatures =
 619         F.getFnAttribute("target-features").getValueAsString();
 620     if (OldFeatures.empty())
 621       NewAttrs.addAttribute("target-features", Features);
 622     else {
 623       SmallString<256> Appended(OldFeatures);
 624       Appended.push_back(',');
 625       Appended.append(Features);
 626       NewAttrs.addAttribute("target-features", Appended);
 627     }
 628   }
 629   if (FramePointerUsageView->getNumOccurrences() > 0 &&
 630       !F.hasFnAttribute("frame-pointer")) {
 631     if (getFramePointerUsage() == FramePointerKind::All)
 632       NewAttrs.addAttribute("frame-pointer", "all");
 633     else if (getFramePointerUsage() == FramePointerKind::NonLeaf)
 634       NewAttrs.addAttribute("frame-pointer", "non-leaf");
 635     else if (getFramePointerUsage() == FramePointerKind::None)
 636       NewAttrs.addAttribute("frame-pointer", "none");
 637   }
 638   if (DisableTailCallsView->getNumOccurrences() > 0)
 639     NewAttrs.addAttribute("disable-tail-calls",
 640                           toStringRef(getDisableTailCalls()));
 641   if (getStackRealign())
 642     NewAttrs.addAttribute("stackrealign");
 643
 644   HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math");
 645   HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math");
 646   HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math");
 647   HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math");
 648
 649   if (DenormalFPMathView->getNumOccurrences() > 0 &&
 650       !F.hasFnAttribute("denormal-fp-math")) {
 651     DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
 652
 653     // FIXME: Command line flag should expose separate input/output modes.
 654     NewAttrs.addAttribute("denormal-fp-math",
 655                           DenormalMode(DenormKind, DenormKind).str());
 656   }
 657
 658   if (DenormalFP32MathView->getNumOccurrences() > 0 &&
 659       !F.hasFnAttribute("denormal-fp-math-f32")) {
 660     // FIXME: Command line flag should expose separate input/output modes.
 661     DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math();
 662
 663     NewAttrs.addAttribute(
 664       "denormal-fp-math-f32",
 665       DenormalMode(DenormKind, DenormKind).str());
 666   }
 667
 668   if (TrapFuncNameView->getNumOccurrences() > 0)
 669     for (auto &B : F)
 670       for (auto &I : B)
 671         if (auto *Call = dyn_cast<CallInst>(&I))
 672           if (const auto *F = Call->getCalledFunction())
 673             if (F->getIntrinsicID() == Intrinsic::debugtrap ||
 674                 F->getIntrinsicID() == Intrinsic::trap)
 675               Call->addFnAttr(
 676                   Attribute::get(Ctx, "trap-func-name", getTrapFuncName()));
 677
 678   // Let NewAttrs override Attrs.
 679   F.setAttributes(Attrs.addFnAttributes(Ctx, NewAttrs));
 680 }
 681
 682 /// Set function attributes of functions in Module M based on CPU,
 683 /// Features, and command line flags.
 684 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
 685                                     Module &M) {
 686   for (Function &F : M)
 687     setFunctionAttributes(CPU, Features, F);
 688 }