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(SwiftAsyncFramePointerMode, SwiftAsyncFramePointer)
  69 CGOPT(bool, DontPlaceZerosInBSS)
  70 CGOPT(bool, EnableGuaranteedTailCallOpt)
  71 CGOPT(bool, DisableTailCalls)
  72 CGOPT(bool, StackSymbolOrdering)
  73 CGOPT(bool, StackRealign)
  74 CGOPT(std::string, TrapFuncName)
  75 CGOPT(bool, UseCtors)
  76 CGOPT(bool, RelaxELFRelocations)
  77 CGOPT_EXP(bool, DataSections)
  78 CGOPT_EXP(bool, FunctionSections)
  79 CGOPT(bool, IgnoreXCOFFVisibility)
  80 CGOPT(bool, XCOFFTracebackTable)
  81 CGOPT(std::string, BBSections)
  82 CGOPT(unsigned, TLSSize)
  83 CGOPT(bool, EmulatedTLS)
  84 CGOPT(bool, UniqueSectionNames)
  85 CGOPT(bool, UniqueBasicBlockSectionNames)
  86 CGOPT(EABI, EABIVersion)
  87 CGOPT(DebuggerKind, DebuggerTuningOpt)
  88 CGOPT(bool, EnableStackSizeSection)
  89 CGOPT(bool, EnableAddrsig)
  90 CGOPT(bool, EmitCallSiteInfo)
  91 CGOPT(bool, EnableMachineFunctionSplitter)
  92 CGOPT(bool, EnableDebugEntryValues)
  93 CGOPT(bool, ForceDwarfFrameSection)
  94 CGOPT(bool, XRayOmitFunctionIndex)
  95 CGOPT(bool, DebugStrictDwarf)
  96 CGOPT(unsigned, AlignLoops)
  97
  98 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
  99 #define CGBINDOPT(NAME)                                                        \
 100   do {                                                                         \
 101     NAME##View = std::addressof(NAME);                                         \
 102   } while (0)
 103
 104   static cl::opt<std::string> MArch(
 105       "march", cl::desc("Architecture to generate code for (see --version)"));
 106   CGBINDOPT(MArch);
 107
 108   static cl::opt<std::string> MCPU(
 109       "mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"),
 110       cl::value_desc("cpu-name"), cl::init(""));
 111   CGBINDOPT(MCPU);
 112
 113   static cl::list<std::string> MAttrs(
 114       "mattr", cl::CommaSeparated,
 115       cl::desc("Target specific attributes (-mattr=help for details)"),
 116       cl::value_desc("a1,+a2,-a3,..."));
 117   CGBINDOPT(MAttrs);
 118
 119   static cl::opt<Reloc::Model> RelocModel(
 120       "relocation-model", cl::desc("Choose relocation model"),
 121       cl::values(
 122           clEnumValN(Reloc::Static, "static", "Non-relocatable code"),
 123           clEnumValN(Reloc::PIC_, "pic",
 124                      "Fully relocatable, position independent code"),
 125           clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
 126                      "Relocatable external references, non-relocatable code"),
 127           clEnumValN(
 128               Reloc::ROPI, "ropi",
 129               "Code and read-only data relocatable, accessed PC-relative"),
 130           clEnumValN(
 131               Reloc::RWPI, "rwpi",
 132               "Read-write data relocatable, accessed relative to static base"),
 133           clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi",
 134                      "Combination of ropi and rwpi")));
 135   CGBINDOPT(RelocModel);
 136
 137   static cl::opt<ThreadModel::Model> ThreadModel(
 138       "thread-model", cl::desc("Choose threading model"),
 139       cl::init(ThreadModel::POSIX),
 140       cl::values(
 141           clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"),
 142           clEnumValN(ThreadModel::Single, "single", "Single thread model")));
 143   CGBINDOPT(ThreadModel);
 144
 145   static cl::opt<CodeModel::Model> CodeModel(
 146       "code-model", cl::desc("Choose code model"),
 147       cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"),
 148                  clEnumValN(CodeModel::Small, "small", "Small code model"),
 149                  clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"),
 150                  clEnumValN(CodeModel::Medium, "medium", "Medium code model"),
 151                  clEnumValN(CodeModel::Large, "large", "Large code model")));
 152   CGBINDOPT(CodeModel);
 153
 154   static cl::opt<ExceptionHandling> ExceptionModel(
 155       "exception-model", cl::desc("exception model"),
 156       cl::init(ExceptionHandling::None),
 157       cl::values(
 158           clEnumValN(ExceptionHandling::None, "default",
 159                      "default exception handling model"),
 160           clEnumValN(ExceptionHandling::DwarfCFI, "dwarf",
 161                      "DWARF-like CFI based exception handling"),
 162           clEnumValN(ExceptionHandling::SjLj, "sjlj",
 163                      "SjLj exception handling"),
 164           clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"),
 165           clEnumValN(ExceptionHandling::WinEH, "wineh",
 166                      "Windows exception model"),
 167           clEnumValN(ExceptionHandling::Wasm, "wasm",
 168                      "WebAssembly exception handling")));
 169   CGBINDOPT(ExceptionModel);
 170
 171   static cl::opt<CodeGenFileType> FileType(
 172       "filetype", cl::init(CGFT_AssemblyFile),
 173       cl::desc(
 174           "Choose a file type (not all types are supported by all targets):"),
 175       cl::values(
 176           clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"),
 177           clEnumValN(CGFT_ObjectFile, "obj",
 178                      "Emit a native object ('.o') file"),
 179           clEnumValN(CGFT_Null, "null",
 180                      "Emit nothing, for performance testing")));
 181   CGBINDOPT(FileType);
 182
 183   static cl::opt<FramePointerKind> FramePointerUsage(
 184       "frame-pointer",
 185       cl::desc("Specify frame pointer elimination optimization"),
 186       cl::init(FramePointerKind::None),
 187       cl::values(
 188           clEnumValN(FramePointerKind::All, "all",
 189                      "Disable frame pointer elimination"),
 190           clEnumValN(FramePointerKind::NonLeaf, "non-leaf",
 191                      "Disable frame pointer elimination for non-leaf frame"),
 192           clEnumValN(FramePointerKind::None, "none",
 193                      "Enable frame pointer elimination")));
 194   CGBINDOPT(FramePointerUsage);
 195
 196   static cl::opt<bool> EnableUnsafeFPMath(
 197       "enable-unsafe-fp-math",
 198       cl::desc("Enable optimizations that may decrease FP precision"),
 199       cl::init(false));
 200   CGBINDOPT(EnableUnsafeFPMath);
 201
 202   static cl::opt<bool> EnableNoInfsFPMath(
 203       "enable-no-infs-fp-math",
 204       cl::desc("Enable FP math optimizations that assume no +-Infs"),
 205       cl::init(false));
 206   CGBINDOPT(EnableNoInfsFPMath);
 207
 208   static cl::opt<bool> EnableNoNaNsFPMath(
 209       "enable-no-nans-fp-math",
 210       cl::desc("Enable FP math optimizations that assume no NaNs"),
 211       cl::init(false));
 212   CGBINDOPT(EnableNoNaNsFPMath);
 213
 214   static cl::opt<bool> EnableNoSignedZerosFPMath(
 215       "enable-no-signed-zeros-fp-math",
 216       cl::desc("Enable FP math optimizations that assume "
 217                "the sign of 0 is insignificant"),
 218       cl::init(false));
 219   CGBINDOPT(EnableNoSignedZerosFPMath);
 220
 221   static cl::opt<bool> EnableNoTrappingFPMath(
 222       "enable-no-trapping-fp-math",
 223       cl::desc("Enable setting the FP exceptions build "
 224                "attribute not to use exceptions"),
 225       cl::init(false));
 226   CGBINDOPT(EnableNoTrappingFPMath);
 227
 228   static const auto DenormFlagEnumOptions =
 229   cl::values(clEnumValN(DenormalMode::IEEE, "ieee",
 230                         "IEEE 754 denormal numbers"),
 231              clEnumValN(DenormalMode::PreserveSign, "preserve-sign",
 232                         "the sign of a  flushed-to-zero number is preserved "
 233                         "in the sign of 0"),
 234              clEnumValN(DenormalMode::PositiveZero, "positive-zero",
 235                         "denormals are flushed to positive zero"));
 236
 237   // FIXME: Doesn't have way to specify separate input and output modes.
 238   static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath(
 239     "denormal-fp-math",
 240     cl::desc("Select which denormal numbers the code is permitted to require"),
 241     cl::init(DenormalMode::IEEE),
 242     DenormFlagEnumOptions);
 243   CGBINDOPT(DenormalFPMath);
 244
 245   static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math(
 246     "denormal-fp-math-f32",
 247     cl::desc("Select which denormal numbers the code is permitted to require for float"),
 248     cl::init(DenormalMode::Invalid),
 249     DenormFlagEnumOptions);
 250   CGBINDOPT(DenormalFP32Math);
 251
 252   static cl::opt<bool> EnableHonorSignDependentRoundingFPMath(
 253       "enable-sign-dependent-rounding-fp-math", cl::Hidden,
 254       cl::desc("Force codegen to assume rounding mode can change dynamically"),
 255       cl::init(false));
 256   CGBINDOPT(EnableHonorSignDependentRoundingFPMath);
 257
 258   static cl::opt<FloatABI::ABIType> FloatABIForCalls(
 259       "float-abi", cl::desc("Choose float ABI type"),
 260       cl::init(FloatABI::Default),
 261       cl::values(clEnumValN(FloatABI::Default, "default",
 262                             "Target default float ABI type"),
 263                  clEnumValN(FloatABI::Soft, "soft",
 264                             "Soft float ABI (implied by -soft-float)"),
 265                  clEnumValN(FloatABI::Hard, "hard",
 266                             "Hard float ABI (uses FP registers)")));
 267   CGBINDOPT(FloatABIForCalls);
 268
 269   static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps(
 270       "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"),
 271       cl::init(FPOpFusion::Standard),
 272       cl::values(
 273           clEnumValN(FPOpFusion::Fast, "fast",
 274                      "Fuse FP ops whenever profitable"),
 275           clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."),
 276           clEnumValN(FPOpFusion::Strict, "off",
 277                      "Only fuse FP ops when the result won't be affected.")));
 278   CGBINDOPT(FuseFPOps);
 279
 280   static cl::opt<SwiftAsyncFramePointerMode> SwiftAsyncFramePointer(
 281       "swift-async-fp",
 282       cl::desc("Determine when the Swift async frame pointer should be set"),
 283       cl::init(SwiftAsyncFramePointerMode::Always),
 284       cl::values(clEnumValN(SwiftAsyncFramePointerMode::DeploymentBased, "auto",
 285                             "Determine based on deployment target"),
 286                  clEnumValN(SwiftAsyncFramePointerMode::Always, "always",
 287                             "Always set the bit"),
 288                  clEnumValN(SwiftAsyncFramePointerMode::Never, "never",
 289                             "Never set the bit")));
 290   CGBINDOPT(SwiftAsyncFramePointer);
 291
 292   static cl::opt<bool> DontPlaceZerosInBSS(
 293       "nozero-initialized-in-bss",
 294       cl::desc("Don't place zero-initialized symbols into bss section"),
 295       cl::init(false));
 296   CGBINDOPT(DontPlaceZerosInBSS);
 297
 298   static cl::opt<bool> EnableAIXExtendedAltivecABI(
 299       "vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."),
 300       cl::init(false));
 301   CGBINDOPT(EnableAIXExtendedAltivecABI);
 302
 303   static cl::opt<bool> EnableGuaranteedTailCallOpt(
 304       "tailcallopt",
 305       cl::desc(
 306           "Turn fastcc calls into tail calls by (potentially) changing ABI."),
 307       cl::init(false));
 308   CGBINDOPT(EnableGuaranteedTailCallOpt);
 309
 310   static cl::opt<bool> DisableTailCalls(
 311       "disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false));
 312   CGBINDOPT(DisableTailCalls);
 313
 314   static cl::opt<bool> StackSymbolOrdering(
 315       "stack-symbol-ordering", cl::desc("Order local stack symbols."),
 316       cl::init(true));
 317   CGBINDOPT(StackSymbolOrdering);
 318
 319   static cl::opt<bool> StackRealign(
 320       "stackrealign",
 321       cl::desc("Force align the stack to the minimum alignment"),
 322       cl::init(false));
 323   CGBINDOPT(StackRealign);
 324
 325   static cl::opt<std::string> TrapFuncName(
 326       "trap-func", cl::Hidden,
 327       cl::desc("Emit a call to trap function rather than a trap instruction"),
 328       cl::init(""));
 329   CGBINDOPT(TrapFuncName);
 330
 331   static cl::opt<bool> UseCtors("use-ctors",
 332                                 cl::desc("Use .ctors instead of .init_array."),
 333                                 cl::init(false));
 334   CGBINDOPT(UseCtors);
 335
 336   static cl::opt<bool> RelaxELFRelocations(
 337       "relax-elf-relocations",
 338       cl::desc(
 339           "Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"),
 340       cl::init(false));
 341   CGBINDOPT(RelaxELFRelocations);
 342
 343   static cl::opt<bool> DataSections(
 344       "data-sections", cl::desc("Emit data into separate sections"),
 345       cl::init(false));
 346   CGBINDOPT(DataSections);
 347
 348   static cl::opt<bool> FunctionSections(
 349       "function-sections", cl::desc("Emit functions into separate sections"),
 350       cl::init(false));
 351   CGBINDOPT(FunctionSections);
 352
 353   static cl::opt<bool> IgnoreXCOFFVisibility(
 354       "ignore-xcoff-visibility",
 355       cl::desc("Not emit the visibility attribute for asm in AIX OS or give "
 356                "all symbols 'unspecified' visibility in XCOFF object file"),
 357       cl::init(false));
 358   CGBINDOPT(IgnoreXCOFFVisibility);
 359
 360   static cl::opt<bool> XCOFFTracebackTable(
 361       "xcoff-traceback-table", cl::desc("Emit the XCOFF traceback table"),
 362       cl::init(true));
 363   CGBINDOPT(XCOFFTracebackTable);
 364
 365   static cl::opt<std::string> BBSections(
 366       "basic-block-sections",
 367       cl::desc("Emit basic blocks into separate sections"),
 368       cl::value_desc("all | <function list (file)> | labels | none"),
 369       cl::init("none"));
 370   CGBINDOPT(BBSections);
 371
 372   static cl::opt<unsigned> TLSSize(
 373       "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0));
 374   CGBINDOPT(TLSSize);
 375
 376   static cl::opt<bool> EmulatedTLS(
 377       "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false));
 378   CGBINDOPT(EmulatedTLS);
 379
 380   static cl::opt<bool> UniqueSectionNames(
 381       "unique-section-names", cl::desc("Give unique names to every section"),
 382       cl::init(true));
 383   CGBINDOPT(UniqueSectionNames);
 384
 385   static cl::opt<bool> UniqueBasicBlockSectionNames(
 386       "unique-basic-block-section-names",
 387       cl::desc("Give unique names to every basic block section"),
 388       cl::init(false));
 389   CGBINDOPT(UniqueBasicBlockSectionNames);
 390
 391   static cl::opt<EABI> EABIVersion(
 392       "meabi", cl::desc("Set EABI type (default depends on triple):"),
 393       cl::init(EABI::Default),
 394       cl::values(
 395           clEnumValN(EABI::Default, "default", "Triple default EABI version"),
 396           clEnumValN(EABI::EABI4, "4", "EABI version 4"),
 397           clEnumValN(EABI::EABI5, "5", "EABI version 5"),
 398           clEnumValN(EABI::GNU, "gnu", "EABI GNU")));
 399   CGBINDOPT(EABIVersion);
 400
 401   static cl::opt<DebuggerKind> DebuggerTuningOpt(
 402       "debugger-tune", cl::desc("Tune debug info for a particular debugger"),
 403       cl::init(DebuggerKind::Default),
 404       cl::values(
 405           clEnumValN(DebuggerKind::GDB, "gdb", "gdb"),
 406           clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"),
 407           clEnumValN(DebuggerKind::DBX, "dbx", "dbx"),
 408           clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)")));
 409   CGBINDOPT(DebuggerTuningOpt);
 410
 411   static cl::opt<bool> EnableStackSizeSection(
 412       "stack-size-section",
 413       cl::desc("Emit a section containing stack size metadata"),
 414       cl::init(false));
 415   CGBINDOPT(EnableStackSizeSection);
 416
 417   static cl::opt<bool> EnableAddrsig(
 418       "addrsig", cl::desc("Emit an address-significance table"),
 419       cl::init(false));
 420   CGBINDOPT(EnableAddrsig);
 421
 422   static cl::opt<bool> EmitCallSiteInfo(
 423       "emit-call-site-info",
 424       cl::desc(
 425           "Emit call site debug information, if debug information is enabled."),
 426       cl::init(false));
 427   CGBINDOPT(EmitCallSiteInfo);
 428
 429   static cl::opt<bool> EnableDebugEntryValues(
 430       "debug-entry-values",
 431       cl::desc("Enable debug info for the debug entry values."),
 432       cl::init(false));
 433   CGBINDOPT(EnableDebugEntryValues);
 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.ForceDwarfFrameSection = getForceDwarfFrameSection();
 531   Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
 532   Options.DebugStrictDwarf = getDebugStrictDwarf();
 533   Options.LoopAlignment = getAlignLoops();
 534
 535   Options.MCOptions = mc::InitMCTargetOptionsFromFlags();
 536
 537   Options.ThreadModel = getThreadModel();
 538   Options.EABIVersion = getEABIVersion();
 539   Options.DebuggerTuning = getDebuggerTuningOpt();
 540   Options.SwiftAsyncFramePointer = getSwiftAsyncFramePointer();
 541   return Options;
 542 }
 543
 544 std::string codegen::getCPUStr() {
 545   // If user asked for the 'native' CPU, autodetect here. If autodection fails,
 546   // this will set the CPU to an empty string which tells the target to
 547   // pick a basic default.
 548   if (getMCPU() == "native")
 549     return std::string(sys::getHostCPUName());
 550
 551   return getMCPU();
 552 }
 553
 554 std::string codegen::getFeaturesStr() {
 555   SubtargetFeatures Features;
 556
 557   // If user asked for the 'native' CPU, we need to autodetect features.
 558   // This is necessary for x86 where the CPU might not support all the
 559   // features the autodetected CPU name lists in the target. For example,
 560   // not all Sandybridge processors support AVX.
 561   if (getMCPU() == "native") {
 562     StringMap<bool> HostFeatures;
 563     if (sys::getHostCPUFeatures(HostFeatures))
 564       for (auto &F : HostFeatures)
 565         Features.AddFeature(F.first(), F.second);
 566   }
 567
 568   for (auto const &MAttr : getMAttrs())
 569     Features.AddFeature(MAttr);
 570
 571   return Features.getString();
 572 }
 573
 574 std::vector<std::string> codegen::getFeatureList() {
 575   SubtargetFeatures Features;
 576
 577   // If user asked for the 'native' CPU, we need to autodetect features.
 578   // This is necessary for x86 where the CPU might not support all the
 579   // features the autodetected CPU name lists in the target. For example,
 580   // not all Sandybridge processors support AVX.
 581   if (getMCPU() == "native") {
 582     StringMap<bool> HostFeatures;
 583     if (sys::getHostCPUFeatures(HostFeatures))
 584       for (auto &F : HostFeatures)
 585         Features.AddFeature(F.first(), F.second);
 586   }
 587
 588   for (auto const &MAttr : getMAttrs())
 589     Features.AddFeature(MAttr);
 590
 591   return Features.getFeatures();
 592 }
 593
 594 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) {
 595   B.addAttribute(Name, Val ? "true" : "false");
 596 }
 597
 598 #define HANDLE_BOOL_ATTR(CL, AttrName)                                         \
 599   do {                                                                         \
 600     if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName))            \
 601       renderBoolStringAttr(NewAttrs, AttrName, *CL);                           \
 602   } while (0)
 603
 604 /// Set function attributes of function \p F based on CPU, Features, and command
 605 /// line flags.
 606 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
 607                                     Function &F) {
 608   auto &Ctx = F.getContext();
 609   AttributeList Attrs = F.getAttributes();
 610   AttrBuilder NewAttrs(Ctx);
 611
 612   if (!CPU.empty() && !F.hasFnAttribute("target-cpu"))
 613     NewAttrs.addAttribute("target-cpu", CPU);
 614   if (!Features.empty()) {
 615     // Append the command line features to any that are already on the function.
 616     StringRef OldFeatures =
 617         F.getFnAttribute("target-features").getValueAsString();
 618     if (OldFeatures.empty())
 619       NewAttrs.addAttribute("target-features", Features);
 620     else {
 621       SmallString<256> Appended(OldFeatures);
 622       Appended.push_back(',');
 623       Appended.append(Features);
 624       NewAttrs.addAttribute("target-features", Appended);
 625     }
 626   }
 627   if (FramePointerUsageView->getNumOccurrences() > 0 &&
 628       !F.hasFnAttribute("frame-pointer")) {
 629     if (getFramePointerUsage() == FramePointerKind::All)
 630       NewAttrs.addAttribute("frame-pointer", "all");
 631     else if (getFramePointerUsage() == FramePointerKind::NonLeaf)
 632       NewAttrs.addAttribute("frame-pointer", "non-leaf");
 633     else if (getFramePointerUsage() == FramePointerKind::None)
 634       NewAttrs.addAttribute("frame-pointer", "none");
 635   }
 636   if (DisableTailCallsView->getNumOccurrences() > 0)
 637     NewAttrs.addAttribute("disable-tail-calls",
 638                           toStringRef(getDisableTailCalls()));
 639   if (getStackRealign())
 640     NewAttrs.addAttribute("stackrealign");
 641
 642   HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math");
 643   HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math");
 644   HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math");
 645   HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math");
 646
 647   if (DenormalFPMathView->getNumOccurrences() > 0 &&
 648       !F.hasFnAttribute("denormal-fp-math")) {
 649     DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
 650
 651     // FIXME: Command line flag should expose separate input/output modes.
 652     NewAttrs.addAttribute("denormal-fp-math",
 653                           DenormalMode(DenormKind, DenormKind).str());
 654   }
 655
 656   if (DenormalFP32MathView->getNumOccurrences() > 0 &&
 657       !F.hasFnAttribute("denormal-fp-math-f32")) {
 658     // FIXME: Command line flag should expose separate input/output modes.
 659     DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math();
 660
 661     NewAttrs.addAttribute(
 662       "denormal-fp-math-f32",
 663       DenormalMode(DenormKind, DenormKind).str());
 664   }
 665
 666   if (TrapFuncNameView->getNumOccurrences() > 0)
 667     for (auto &B : F)
 668       for (auto &I : B)
 669         if (auto *Call = dyn_cast<CallInst>(&I))
 670           if (const auto *F = Call->getCalledFunction())
 671             if (F->getIntrinsicID() == Intrinsic::debugtrap ||
 672                 F->getIntrinsicID() == Intrinsic::trap)
 673               Call->addFnAttr(
 674                   Attribute::get(Ctx, "trap-func-name", getTrapFuncName()));
 675
 676   // Let NewAttrs override Attrs.
 677   F.setAttributes(Attrs.addFnAttributes(Ctx, NewAttrs));
 678 }
 679
 680 /// Set function attributes of functions in Module M based on CPU,
 681 /// Features, and command line flags.
 682 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
 683                                     Module &M) {
 684   for (Function &F : M)
 685     setFunctionAttributes(CPU, Features, F);
 686 }
 687