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