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(bool, IgnoreXCOFFVisibility) 78 CGOPT(std::string, BBSections) 79 CGOPT(std::string, StackProtectorGuard) 80 CGOPT(unsigned, StackProtectorGuardOffset) 81 CGOPT(std::string, StackProtectorGuardReg) 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, ValueTrackingVariableLocations) 94 CGOPT(bool, ForceDwarfFrameSection) 95 CGOPT(bool, XRayOmitFunctionIndex) 96 97 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() { 98 #define CGBINDOPT(NAME) \ 99 do { \ 100 NAME##View = std::addressof(NAME); \ 101 } while (0) 102 103 static cl::opt<std::string> MArch( 104 "march", cl::desc("Architecture to generate code for (see --version)")); 105 CGBINDOPT(MArch); 106 107 static cl::opt<std::string> MCPU( 108 "mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"), 109 cl::value_desc("cpu-name"), cl::init("")); 110 CGBINDOPT(MCPU); 111 112 static cl::list<std::string> MAttrs( 113 "mattr", cl::CommaSeparated, 114 cl::desc("Target specific attributes (-mattr=help for details)"), 115 cl::value_desc("a1,+a2,-a3,...")); 116 CGBINDOPT(MAttrs); 117 118 static cl::opt<Reloc::Model> RelocModel( 119 "relocation-model", cl::desc("Choose relocation model"), 120 cl::values( 121 clEnumValN(Reloc::Static, "static", "Non-relocatable code"), 122 clEnumValN(Reloc::PIC_, "pic", 123 "Fully relocatable, position independent code"), 124 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", 125 "Relocatable external references, non-relocatable code"), 126 clEnumValN( 127 Reloc::ROPI, "ropi", 128 "Code and read-only data relocatable, accessed PC-relative"), 129 clEnumValN( 130 Reloc::RWPI, "rwpi", 131 "Read-write data relocatable, accessed relative to static base"), 132 clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi", 133 "Combination of ropi and rwpi"))); 134 CGBINDOPT(RelocModel); 135 136 static cl::opt<ThreadModel::Model> ThreadModel( 137 "thread-model", cl::desc("Choose threading model"), 138 cl::init(ThreadModel::POSIX), 139 cl::values( 140 clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"), 141 clEnumValN(ThreadModel::Single, "single", "Single thread model"))); 142 CGBINDOPT(ThreadModel); 143 144 static cl::opt<CodeModel::Model> CodeModel( 145 "code-model", cl::desc("Choose code model"), 146 cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"), 147 clEnumValN(CodeModel::Small, "small", "Small code model"), 148 clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"), 149 clEnumValN(CodeModel::Medium, "medium", "Medium code model"), 150 clEnumValN(CodeModel::Large, "large", "Large code model"))); 151 CGBINDOPT(CodeModel); 152 153 static cl::opt<ExceptionHandling> ExceptionModel( 154 "exception-model", cl::desc("exception model"), 155 cl::init(ExceptionHandling::None), 156 cl::values( 157 clEnumValN(ExceptionHandling::None, "default", 158 "default exception handling model"), 159 clEnumValN(ExceptionHandling::DwarfCFI, "dwarf", 160 "DWARF-like CFI based exception handling"), 161 clEnumValN(ExceptionHandling::SjLj, "sjlj", 162 "SjLj exception handling"), 163 clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"), 164 clEnumValN(ExceptionHandling::WinEH, "wineh", 165 "Windows exception model"), 166 clEnumValN(ExceptionHandling::Wasm, "wasm", 167 "WebAssembly exception handling"))); 168 CGBINDOPT(ExceptionModel); 169 170 static cl::opt<CodeGenFileType> FileType( 171 "filetype", cl::init(CGFT_AssemblyFile), 172 cl::desc( 173 "Choose a file type (not all types are supported by all targets):"), 174 cl::values( 175 clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"), 176 clEnumValN(CGFT_ObjectFile, "obj", 177 "Emit a native object ('.o') file"), 178 clEnumValN(CGFT_Null, "null", 179 "Emit nothing, for performance testing"))); 180 CGBINDOPT(FileType); 181 182 static cl::opt<FramePointer::FP> FramePointerUsage( 183 "frame-pointer", 184 cl::desc("Specify frame pointer elimination optimization"), 185 cl::init(FramePointer::None), 186 cl::values( 187 clEnumValN(FramePointer::All, "all", 188 "Disable frame pointer elimination"), 189 clEnumValN(FramePointer::NonLeaf, "non-leaf", 190 "Disable frame pointer elimination for non-leaf frame"), 191 clEnumValN(FramePointer::None, "none", 192 "Enable frame pointer elimination"))); 193 CGBINDOPT(FramePointerUsage); 194 195 static cl::opt<bool> EnableUnsafeFPMath( 196 "enable-unsafe-fp-math", 197 cl::desc("Enable optimizations that may decrease FP precision"), 198 cl::init(false)); 199 CGBINDOPT(EnableUnsafeFPMath); 200 201 static cl::opt<bool> EnableNoInfsFPMath( 202 "enable-no-infs-fp-math", 203 cl::desc("Enable FP math optimizations that assume no +-Infs"), 204 cl::init(false)); 205 CGBINDOPT(EnableNoInfsFPMath); 206 207 static cl::opt<bool> EnableNoNaNsFPMath( 208 "enable-no-nans-fp-math", 209 cl::desc("Enable FP math optimizations that assume no NaNs"), 210 cl::init(false)); 211 CGBINDOPT(EnableNoNaNsFPMath); 212 213 static cl::opt<bool> EnableNoSignedZerosFPMath( 214 "enable-no-signed-zeros-fp-math", 215 cl::desc("Enable FP math optimizations that assume " 216 "the sign of 0 is insignificant"), 217 cl::init(false)); 218 CGBINDOPT(EnableNoSignedZerosFPMath); 219 220 static cl::opt<bool> EnableNoTrappingFPMath( 221 "enable-no-trapping-fp-math", 222 cl::desc("Enable setting the FP exceptions build " 223 "attribute not to use exceptions"), 224 cl::init(false)); 225 CGBINDOPT(EnableNoTrappingFPMath); 226 227 static const auto DenormFlagEnumOptions = 228 cl::values(clEnumValN(DenormalMode::IEEE, "ieee", 229 "IEEE 754 denormal numbers"), 230 clEnumValN(DenormalMode::PreserveSign, "preserve-sign", 231 "the sign of a flushed-to-zero number is preserved " 232 "in the sign of 0"), 233 clEnumValN(DenormalMode::PositiveZero, "positive-zero", 234 "denormals are flushed to positive zero")); 235 236 // FIXME: Doesn't have way to specify separate input and output modes. 237 static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath( 238 "denormal-fp-math", 239 cl::desc("Select which denormal numbers the code is permitted to require"), 240 cl::init(DenormalMode::IEEE), 241 DenormFlagEnumOptions); 242 CGBINDOPT(DenormalFPMath); 243 244 static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math( 245 "denormal-fp-math-f32", 246 cl::desc("Select which denormal numbers the code is permitted to require for float"), 247 cl::init(DenormalMode::Invalid), 248 DenormFlagEnumOptions); 249 CGBINDOPT(DenormalFP32Math); 250 251 static cl::opt<bool> EnableHonorSignDependentRoundingFPMath( 252 "enable-sign-dependent-rounding-fp-math", cl::Hidden, 253 cl::desc("Force codegen to assume rounding mode can change dynamically"), 254 cl::init(false)); 255 CGBINDOPT(EnableHonorSignDependentRoundingFPMath); 256 257 static cl::opt<FloatABI::ABIType> FloatABIForCalls( 258 "float-abi", cl::desc("Choose float ABI type"), 259 cl::init(FloatABI::Default), 260 cl::values(clEnumValN(FloatABI::Default, "default", 261 "Target default float ABI type"), 262 clEnumValN(FloatABI::Soft, "soft", 263 "Soft float ABI (implied by -soft-float)"), 264 clEnumValN(FloatABI::Hard, "hard", 265 "Hard float ABI (uses FP registers)"))); 266 CGBINDOPT(FloatABIForCalls); 267 268 static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps( 269 "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"), 270 cl::init(FPOpFusion::Standard), 271 cl::values( 272 clEnumValN(FPOpFusion::Fast, "fast", 273 "Fuse FP ops whenever profitable"), 274 clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."), 275 clEnumValN(FPOpFusion::Strict, "off", 276 "Only fuse FP ops when the result won't be affected."))); 277 CGBINDOPT(FuseFPOps); 278 279 static cl::opt<bool> DontPlaceZerosInBSS( 280 "nozero-initialized-in-bss", 281 cl::desc("Don't place zero-initialized symbols into bss section"), 282 cl::init(false)); 283 CGBINDOPT(DontPlaceZerosInBSS); 284 285 static cl::opt<bool> EnableGuaranteedTailCallOpt( 286 "tailcallopt", 287 cl::desc( 288 "Turn fastcc calls into tail calls by (potentially) changing ABI."), 289 cl::init(false)); 290 CGBINDOPT(EnableGuaranteedTailCallOpt); 291 292 static cl::opt<bool> DisableTailCalls( 293 "disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false)); 294 CGBINDOPT(DisableTailCalls); 295 296 static cl::opt<bool> StackSymbolOrdering( 297 "stack-symbol-ordering", cl::desc("Order local stack symbols."), 298 cl::init(true)); 299 CGBINDOPT(StackSymbolOrdering); 300 301 static cl::opt<unsigned> OverrideStackAlignment( 302 "stack-alignment", cl::desc("Override default stack alignment"), 303 cl::init(0)); 304 CGBINDOPT(OverrideStackAlignment); 305 306 static cl::opt<bool> StackRealign( 307 "stackrealign", 308 cl::desc("Force align the stack to the minimum alignment"), 309 cl::init(false)); 310 CGBINDOPT(StackRealign); 311 312 static cl::opt<std::string> TrapFuncName( 313 "trap-func", cl::Hidden, 314 cl::desc("Emit a call to trap function rather than a trap instruction"), 315 cl::init("")); 316 CGBINDOPT(TrapFuncName); 317 318 static cl::opt<bool> UseCtors("use-ctors", 319 cl::desc("Use .ctors instead of .init_array."), 320 cl::init(false)); 321 CGBINDOPT(UseCtors); 322 323 static cl::opt<bool> RelaxELFRelocations( 324 "relax-elf-relocations", 325 cl::desc( 326 "Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"), 327 cl::init(false)); 328 CGBINDOPT(RelaxELFRelocations); 329 330 static cl::opt<bool> DataSections( 331 "data-sections", cl::desc("Emit data into separate sections"), 332 cl::init(false)); 333 CGBINDOPT(DataSections); 334 335 static cl::opt<bool> FunctionSections( 336 "function-sections", cl::desc("Emit functions into separate sections"), 337 cl::init(false)); 338 CGBINDOPT(FunctionSections); 339 340 static cl::opt<bool> IgnoreXCOFFVisibility( 341 "ignore-xcoff-visibility", 342 cl::desc("Not emit the visibility attribute for asm in AIX OS or give " 343 "all symbols 'unspecified' visibility in XCOFF object file"), 344 cl::init(false)); 345 CGBINDOPT(IgnoreXCOFFVisibility); 346 347 static cl::opt<std::string> BBSections( 348 "basic-block-sections", 349 cl::desc("Emit basic blocks into separate sections"), 350 cl::value_desc("all | <function list (file)> | labels | none"), 351 cl::init("none")); 352 CGBINDOPT(BBSections); 353 354 static cl::opt<std::string> StackProtectorGuard( 355 "stack-protector-guard", cl::desc("Stack protector guard mode"), 356 cl::init("none")); 357 CGBINDOPT(StackProtectorGuard); 358 359 static cl::opt<std::string> StackProtectorGuardReg( 360 "stack-protector-guard-reg", cl::desc("Stack protector guard register"), 361 cl::init("none")); 362 CGBINDOPT(StackProtectorGuardReg); 363 364 static cl::opt<unsigned> StackProtectorGuardOffset( 365 "stack-protector-guard-offset", cl::desc("Stack protector guard offset"), 366 cl::init((unsigned)-1)); 367 CGBINDOPT(StackProtectorGuardOffset); 368 369 static cl::opt<unsigned> TLSSize( 370 "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0)); 371 CGBINDOPT(TLSSize); 372 373 static cl::opt<bool> EmulatedTLS( 374 "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false)); 375 CGBINDOPT(EmulatedTLS); 376 377 static cl::opt<bool> UniqueSectionNames( 378 "unique-section-names", cl::desc("Give unique names to every section"), 379 cl::init(true)); 380 CGBINDOPT(UniqueSectionNames); 381 382 static cl::opt<bool> UniqueBasicBlockSectionNames( 383 "unique-basic-block-section-names", 384 cl::desc("Give unique names to every basic block section"), 385 cl::init(false)); 386 CGBINDOPT(UniqueBasicBlockSectionNames); 387 388 static cl::opt<EABI> EABIVersion( 389 "meabi", cl::desc("Set EABI type (default depends on triple):"), 390 cl::init(EABI::Default), 391 cl::values( 392 clEnumValN(EABI::Default, "default", "Triple default EABI version"), 393 clEnumValN(EABI::EABI4, "4", "EABI version 4"), 394 clEnumValN(EABI::EABI5, "5", "EABI version 5"), 395 clEnumValN(EABI::GNU, "gnu", "EABI GNU"))); 396 CGBINDOPT(EABIVersion); 397 398 static cl::opt<DebuggerKind> DebuggerTuningOpt( 399 "debugger-tune", cl::desc("Tune debug info for a particular debugger"), 400 cl::init(DebuggerKind::Default), 401 cl::values( 402 clEnumValN(DebuggerKind::GDB, "gdb", "gdb"), 403 clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"), 404 clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)"))); 405 CGBINDOPT(DebuggerTuningOpt); 406 407 static cl::opt<bool> EnableStackSizeSection( 408 "stack-size-section", 409 cl::desc("Emit a section containing stack size metadata"), 410 cl::init(false)); 411 CGBINDOPT(EnableStackSizeSection); 412 413 static cl::opt<bool> EnableAddrsig( 414 "addrsig", cl::desc("Emit an address-significance table"), 415 cl::init(false)); 416 CGBINDOPT(EnableAddrsig); 417 418 static cl::opt<bool> EmitCallSiteInfo( 419 "emit-call-site-info", 420 cl::desc( 421 "Emit call site debug information, if debug information is enabled."), 422 cl::init(false)); 423 CGBINDOPT(EmitCallSiteInfo); 424 425 static cl::opt<bool> EnableDebugEntryValues( 426 "debug-entry-values", 427 cl::desc("Enable debug info for the debug entry values."), 428 cl::init(false)); 429 CGBINDOPT(EnableDebugEntryValues); 430 431 static cl::opt<bool> ValueTrackingVariableLocations( 432 "experimental-debug-variable-locations", 433 cl::desc("Use experimental new value-tracking variable locations"), 434 cl::init(false)); 435 CGBINDOPT(ValueTrackingVariableLocations); 436 437 static cl::opt<bool> EnableMachineFunctionSplitter( 438 "split-machine-functions", 439 cl::desc("Split out cold basic blocks from machine functions based on " 440 "profile information"), 441 cl::init(false)); 442 CGBINDOPT(EnableMachineFunctionSplitter); 443 444 static cl::opt<bool> ForceDwarfFrameSection( 445 "force-dwarf-frame-section", 446 cl::desc("Always emit a debug frame section."), cl::init(false)); 447 CGBINDOPT(ForceDwarfFrameSection); 448 449 static cl::opt<bool> XRayOmitFunctionIndex( 450 "no-xray-index", cl::desc("Don't emit xray_fn_idx section"), 451 cl::init(false)); 452 CGBINDOPT(XRayOmitFunctionIndex); 453 454 #undef CGBINDOPT 455 456 mc::RegisterMCTargetOptionsFlags(); 457 } 458 459 llvm::BasicBlockSection 460 codegen::getBBSectionsMode(llvm::TargetOptions &Options) { 461 if (getBBSections() == "all") 462 return BasicBlockSection::All; 463 else if (getBBSections() == "labels") 464 return BasicBlockSection::Labels; 465 else if (getBBSections() == "none") 466 return BasicBlockSection::None; 467 else { 468 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = 469 MemoryBuffer::getFile(getBBSections()); 470 if (!MBOrErr) { 471 errs() << "Error loading basic block sections function list file: " 472 << MBOrErr.getError().message() << "\n"; 473 } else { 474 Options.BBSectionsFuncListBuf = std::move(*MBOrErr); 475 } 476 return BasicBlockSection::List; 477 } 478 } 479 480 llvm::StackProtectorGuards 481 codegen::getStackProtectorGuardMode(llvm::TargetOptions &Options) { 482 if (getStackProtectorGuard() == "tls") 483 return StackProtectorGuards::TLS; 484 if (getStackProtectorGuard() == "global") 485 return StackProtectorGuards::Global; 486 if (getStackProtectorGuard() != "none") { 487 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = 488 MemoryBuffer::getFile(getStackProtectorGuard()); 489 if (!MBOrErr) 490 errs() << "error illegal stack protector guard mode: " 491 << MBOrErr.getError().message() << "\n"; 492 else 493 Options.BBSectionsFuncListBuf = std::move(*MBOrErr); 494 } 495 return StackProtectorGuards::None; 496 } 497 498 // Common utility function tightly tied to the options listed here. Initializes 499 // a TargetOptions object with CodeGen flags and returns it. 500 TargetOptions 501 codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) { 502 TargetOptions Options; 503 Options.AllowFPOpFusion = getFuseFPOps(); 504 Options.UnsafeFPMath = getEnableUnsafeFPMath(); 505 Options.NoInfsFPMath = getEnableNoInfsFPMath(); 506 Options.NoNaNsFPMath = getEnableNoNaNsFPMath(); 507 Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath(); 508 Options.NoTrappingFPMath = getEnableNoTrappingFPMath(); 509 510 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath(); 511 512 // FIXME: Should have separate input and output flags 513 Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind)); 514 515 Options.HonorSignDependentRoundingFPMathOption = 516 getEnableHonorSignDependentRoundingFPMath(); 517 if (getFloatABIForCalls() != FloatABI::Default) 518 Options.FloatABIType = getFloatABIForCalls(); 519 Options.NoZerosInBSS = getDontPlaceZerosInBSS(); 520 Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt(); 521 Options.StackAlignmentOverride = getOverrideStackAlignment(); 522 Options.StackSymbolOrdering = getStackSymbolOrdering(); 523 Options.UseInitArray = !getUseCtors(); 524 Options.RelaxELFRelocations = getRelaxELFRelocations(); 525 Options.DataSections = 526 getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections()); 527 Options.FunctionSections = getFunctionSections(); 528 Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility(); 529 Options.BBSections = getBBSectionsMode(Options); 530 Options.UniqueSectionNames = getUniqueSectionNames(); 531 Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames(); 532 Options.StackProtectorGuard = getStackProtectorGuardMode(Options); 533 Options.StackProtectorGuardOffset = getStackProtectorGuardOffset(); 534 Options.StackProtectorGuardReg = getStackProtectorGuardReg(); 535 Options.TLSSize = getTLSSize(); 536 Options.EmulatedTLS = getEmulatedTLS(); 537 Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0; 538 Options.ExceptionModel = getExceptionModel(); 539 Options.EmitStackSizeSection = getEnableStackSizeSection(); 540 Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter(); 541 Options.EmitAddrsig = getEnableAddrsig(); 542 Options.EmitCallSiteInfo = getEmitCallSiteInfo(); 543 Options.EnableDebugEntryValues = getEnableDebugEntryValues(); 544 Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations(); 545 Options.ForceDwarfFrameSection = getForceDwarfFrameSection(); 546 Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex(); 547 548 Options.MCOptions = mc::InitMCTargetOptionsFromFlags(); 549 550 Options.ThreadModel = getThreadModel(); 551 Options.EABIVersion = getEABIVersion(); 552 Options.DebuggerTuning = getDebuggerTuningOpt(); 553 554 return Options; 555 } 556 557 std::string codegen::getCPUStr() { 558 // If user asked for the 'native' CPU, autodetect here. If autodection fails, 559 // this will set the CPU to an empty string which tells the target to 560 // pick a basic default. 561 if (getMCPU() == "native") 562 return std::string(sys::getHostCPUName()); 563 564 return getMCPU(); 565 } 566 567 std::string codegen::getFeaturesStr() { 568 SubtargetFeatures Features; 569 570 // If user asked for the 'native' CPU, we need to autodetect features. 571 // This is necessary for x86 where the CPU might not support all the 572 // features the autodetected CPU name lists in the target. For example, 573 // not all Sandybridge processors support AVX. 574 if (getMCPU() == "native") { 575 StringMap<bool> HostFeatures; 576 if (sys::getHostCPUFeatures(HostFeatures)) 577 for (auto &F : HostFeatures) 578 Features.AddFeature(F.first(), F.second); 579 } 580 581 for (auto const &MAttr : getMAttrs()) 582 Features.AddFeature(MAttr); 583 584 return Features.getString(); 585 } 586 587 std::vector<std::string> codegen::getFeatureList() { 588 SubtargetFeatures Features; 589 590 // If user asked for the 'native' CPU, we need to autodetect features. 591 // This is necessary for x86 where the CPU might not support all the 592 // features the autodetected CPU name lists in the target. For example, 593 // not all Sandybridge processors support AVX. 594 if (getMCPU() == "native") { 595 StringMap<bool> HostFeatures; 596 if (sys::getHostCPUFeatures(HostFeatures)) 597 for (auto &F : HostFeatures) 598 Features.AddFeature(F.first(), F.second); 599 } 600 601 for (auto const &MAttr : getMAttrs()) 602 Features.AddFeature(MAttr); 603 604 return Features.getFeatures(); 605 } 606 607 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) { 608 B.addAttribute(Name, Val ? "true" : "false"); 609 } 610 611 #define HANDLE_BOOL_ATTR(CL, AttrName) \ 612 do { \ 613 if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName)) \ 614 renderBoolStringAttr(NewAttrs, AttrName, *CL); \ 615 } while (0) 616 617 /// Set function attributes of function \p F based on CPU, Features, and command 618 /// line flags. 619 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features, 620 Function &F) { 621 auto &Ctx = F.getContext(); 622 AttributeList Attrs = F.getAttributes(); 623 AttrBuilder NewAttrs; 624 625 if (!CPU.empty() && !F.hasFnAttribute("target-cpu")) 626 NewAttrs.addAttribute("target-cpu", CPU); 627 if (!Features.empty()) { 628 // Append the command line features to any that are already on the function. 629 StringRef OldFeatures = 630 F.getFnAttribute("target-features").getValueAsString(); 631 if (OldFeatures.empty()) 632 NewAttrs.addAttribute("target-features", Features); 633 else { 634 SmallString<256> Appended(OldFeatures); 635 Appended.push_back(','); 636 Appended.append(Features); 637 NewAttrs.addAttribute("target-features", Appended); 638 } 639 } 640 if (FramePointerUsageView->getNumOccurrences() > 0 && 641 !F.hasFnAttribute("frame-pointer")) { 642 if (getFramePointerUsage() == FramePointer::All) 643 NewAttrs.addAttribute("frame-pointer", "all"); 644 else if (getFramePointerUsage() == FramePointer::NonLeaf) 645 NewAttrs.addAttribute("frame-pointer", "non-leaf"); 646 else if (getFramePointerUsage() == FramePointer::None) 647 NewAttrs.addAttribute("frame-pointer", "none"); 648 } 649 if (DisableTailCallsView->getNumOccurrences() > 0) 650 NewAttrs.addAttribute("disable-tail-calls", 651 toStringRef(getDisableTailCalls())); 652 if (getStackRealign()) 653 NewAttrs.addAttribute("stackrealign"); 654 655 HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math"); 656 HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math"); 657 HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math"); 658 HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math"); 659 660 if (DenormalFPMathView->getNumOccurrences() > 0 && 661 !F.hasFnAttribute("denormal-fp-math")) { 662 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath(); 663 664 // FIXME: Command line flag should expose separate input/output modes. 665 NewAttrs.addAttribute("denormal-fp-math", 666 DenormalMode(DenormKind, DenormKind).str()); 667 } 668 669 if (DenormalFP32MathView->getNumOccurrences() > 0 && 670 !F.hasFnAttribute("denormal-fp-math-f32")) { 671 // FIXME: Command line flag should expose separate input/output modes. 672 DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math(); 673 674 NewAttrs.addAttribute( 675 "denormal-fp-math-f32", 676 DenormalMode(DenormKind, DenormKind).str()); 677 } 678 679 if (TrapFuncNameView->getNumOccurrences() > 0) 680 for (auto &B : F) 681 for (auto &I : B) 682 if (auto *Call = dyn_cast<CallInst>(&I)) 683 if (const auto *F = Call->getCalledFunction()) 684 if (F->getIntrinsicID() == Intrinsic::debugtrap || 685 F->getIntrinsicID() == Intrinsic::trap) 686 Call->addAttribute( 687 AttributeList::FunctionIndex, 688 Attribute::get(Ctx, "trap-func-name", getTrapFuncName())); 689 690 // Let NewAttrs override Attrs. 691 F.setAttributes( 692 Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs)); 693 } 694 695 /// Set function attributes of functions in Module M based on CPU, 696 /// Features, and command line flags. 697 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features, 698 Module &M) { 699 for (Function &F : M) 700 setFunctionAttributes(CPU, Features, F); 701 } 702