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(unsigned, OverrideStackAlignment) 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(std::string, StackProtectorGuard) 83 CGOPT(int, StackProtectorGuardOffset) 84 CGOPT(std::string, StackProtectorGuardReg) 85 CGOPT(unsigned, TLSSize) 86 CGOPT(bool, EmulatedTLS) 87 CGOPT(bool, UniqueSectionNames) 88 CGOPT(bool, UniqueBasicBlockSectionNames) 89 CGOPT(EABI, EABIVersion) 90 CGOPT(DebuggerKind, DebuggerTuningOpt) 91 CGOPT(bool, EnableStackSizeSection) 92 CGOPT(bool, EnableAddrsig) 93 CGOPT(bool, EmitCallSiteInfo) 94 CGOPT(bool, EnableMachineFunctionSplitter) 95 CGOPT(bool, EnableDebugEntryValues) 96 CGOPT(bool, PseudoProbeForProfiling) 97 CGOPT(bool, ValueTrackingVariableLocations) 98 CGOPT(bool, ForceDwarfFrameSection) 99 CGOPT(bool, XRayOmitFunctionIndex) 100 CGOPT(bool, DebugStrictDwarf) 101 102 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() { 103 #define CGBINDOPT(NAME) \ 104 do { \ 105 NAME##View = std::addressof(NAME); \ 106 } while (0) 107 108 static cl::opt<std::string> MArch( 109 "march", cl::desc("Architecture to generate code for (see --version)")); 110 CGBINDOPT(MArch); 111 112 static cl::opt<std::string> MCPU( 113 "mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"), 114 cl::value_desc("cpu-name"), cl::init("")); 115 CGBINDOPT(MCPU); 116 117 static cl::list<std::string> MAttrs( 118 "mattr", cl::CommaSeparated, 119 cl::desc("Target specific attributes (-mattr=help for details)"), 120 cl::value_desc("a1,+a2,-a3,...")); 121 CGBINDOPT(MAttrs); 122 123 static cl::opt<Reloc::Model> RelocModel( 124 "relocation-model", cl::desc("Choose relocation model"), 125 cl::values( 126 clEnumValN(Reloc::Static, "static", "Non-relocatable code"), 127 clEnumValN(Reloc::PIC_, "pic", 128 "Fully relocatable, position independent code"), 129 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", 130 "Relocatable external references, non-relocatable code"), 131 clEnumValN( 132 Reloc::ROPI, "ropi", 133 "Code and read-only data relocatable, accessed PC-relative"), 134 clEnumValN( 135 Reloc::RWPI, "rwpi", 136 "Read-write data relocatable, accessed relative to static base"), 137 clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi", 138 "Combination of ropi and rwpi"))); 139 CGBINDOPT(RelocModel); 140 141 static cl::opt<ThreadModel::Model> ThreadModel( 142 "thread-model", cl::desc("Choose threading model"), 143 cl::init(ThreadModel::POSIX), 144 cl::values( 145 clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"), 146 clEnumValN(ThreadModel::Single, "single", "Single thread model"))); 147 CGBINDOPT(ThreadModel); 148 149 static cl::opt<CodeModel::Model> CodeModel( 150 "code-model", cl::desc("Choose code model"), 151 cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"), 152 clEnumValN(CodeModel::Small, "small", "Small code model"), 153 clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"), 154 clEnumValN(CodeModel::Medium, "medium", "Medium code model"), 155 clEnumValN(CodeModel::Large, "large", "Large code model"))); 156 CGBINDOPT(CodeModel); 157 158 static cl::opt<ExceptionHandling> ExceptionModel( 159 "exception-model", cl::desc("exception model"), 160 cl::init(ExceptionHandling::None), 161 cl::values( 162 clEnumValN(ExceptionHandling::None, "default", 163 "default exception handling model"), 164 clEnumValN(ExceptionHandling::DwarfCFI, "dwarf", 165 "DWARF-like CFI based exception handling"), 166 clEnumValN(ExceptionHandling::SjLj, "sjlj", 167 "SjLj exception handling"), 168 clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"), 169 clEnumValN(ExceptionHandling::WinEH, "wineh", 170 "Windows exception model"), 171 clEnumValN(ExceptionHandling::Wasm, "wasm", 172 "WebAssembly exception handling"))); 173 CGBINDOPT(ExceptionModel); 174 175 static cl::opt<CodeGenFileType> FileType( 176 "filetype", cl::init(CGFT_AssemblyFile), 177 cl::desc( 178 "Choose a file type (not all types are supported by all targets):"), 179 cl::values( 180 clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"), 181 clEnumValN(CGFT_ObjectFile, "obj", 182 "Emit a native object ('.o') file"), 183 clEnumValN(CGFT_Null, "null", 184 "Emit nothing, for performance testing"))); 185 CGBINDOPT(FileType); 186 187 static cl::opt<FramePointerKind> FramePointerUsage( 188 "frame-pointer", 189 cl::desc("Specify frame pointer elimination optimization"), 190 cl::init(FramePointerKind::None), 191 cl::values( 192 clEnumValN(FramePointerKind::All, "all", 193 "Disable frame pointer elimination"), 194 clEnumValN(FramePointerKind::NonLeaf, "non-leaf", 195 "Disable frame pointer elimination for non-leaf frame"), 196 clEnumValN(FramePointerKind::None, "none", 197 "Enable frame pointer elimination"))); 198 CGBINDOPT(FramePointerUsage); 199 200 static cl::opt<bool> EnableUnsafeFPMath( 201 "enable-unsafe-fp-math", 202 cl::desc("Enable optimizations that may decrease FP precision"), 203 cl::init(false)); 204 CGBINDOPT(EnableUnsafeFPMath); 205 206 static cl::opt<bool> EnableNoInfsFPMath( 207 "enable-no-infs-fp-math", 208 cl::desc("Enable FP math optimizations that assume no +-Infs"), 209 cl::init(false)); 210 CGBINDOPT(EnableNoInfsFPMath); 211 212 static cl::opt<bool> EnableNoNaNsFPMath( 213 "enable-no-nans-fp-math", 214 cl::desc("Enable FP math optimizations that assume no NaNs"), 215 cl::init(false)); 216 CGBINDOPT(EnableNoNaNsFPMath); 217 218 static cl::opt<bool> EnableNoSignedZerosFPMath( 219 "enable-no-signed-zeros-fp-math", 220 cl::desc("Enable FP math optimizations that assume " 221 "the sign of 0 is insignificant"), 222 cl::init(false)); 223 CGBINDOPT(EnableNoSignedZerosFPMath); 224 225 static cl::opt<bool> EnableNoTrappingFPMath( 226 "enable-no-trapping-fp-math", 227 cl::desc("Enable setting the FP exceptions build " 228 "attribute not to use exceptions"), 229 cl::init(false)); 230 CGBINDOPT(EnableNoTrappingFPMath); 231 232 static const auto DenormFlagEnumOptions = 233 cl::values(clEnumValN(DenormalMode::IEEE, "ieee", 234 "IEEE 754 denormal numbers"), 235 clEnumValN(DenormalMode::PreserveSign, "preserve-sign", 236 "the sign of a flushed-to-zero number is preserved " 237 "in the sign of 0"), 238 clEnumValN(DenormalMode::PositiveZero, "positive-zero", 239 "denormals are flushed to positive zero")); 240 241 // FIXME: Doesn't have way to specify separate input and output modes. 242 static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath( 243 "denormal-fp-math", 244 cl::desc("Select which denormal numbers the code is permitted to require"), 245 cl::init(DenormalMode::IEEE), 246 DenormFlagEnumOptions); 247 CGBINDOPT(DenormalFPMath); 248 249 static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math( 250 "denormal-fp-math-f32", 251 cl::desc("Select which denormal numbers the code is permitted to require for float"), 252 cl::init(DenormalMode::Invalid), 253 DenormFlagEnumOptions); 254 CGBINDOPT(DenormalFP32Math); 255 256 static cl::opt<bool> EnableHonorSignDependentRoundingFPMath( 257 "enable-sign-dependent-rounding-fp-math", cl::Hidden, 258 cl::desc("Force codegen to assume rounding mode can change dynamically"), 259 cl::init(false)); 260 CGBINDOPT(EnableHonorSignDependentRoundingFPMath); 261 262 static cl::opt<FloatABI::ABIType> FloatABIForCalls( 263 "float-abi", cl::desc("Choose float ABI type"), 264 cl::init(FloatABI::Default), 265 cl::values(clEnumValN(FloatABI::Default, "default", 266 "Target default float ABI type"), 267 clEnumValN(FloatABI::Soft, "soft", 268 "Soft float ABI (implied by -soft-float)"), 269 clEnumValN(FloatABI::Hard, "hard", 270 "Hard float ABI (uses FP registers)"))); 271 CGBINDOPT(FloatABIForCalls); 272 273 static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps( 274 "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"), 275 cl::init(FPOpFusion::Standard), 276 cl::values( 277 clEnumValN(FPOpFusion::Fast, "fast", 278 "Fuse FP ops whenever profitable"), 279 clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."), 280 clEnumValN(FPOpFusion::Strict, "off", 281 "Only fuse FP ops when the result won't be affected."))); 282 CGBINDOPT(FuseFPOps); 283 284 static cl::opt<bool> DontPlaceZerosInBSS( 285 "nozero-initialized-in-bss", 286 cl::desc("Don't place zero-initialized symbols into bss section"), 287 cl::init(false)); 288 CGBINDOPT(DontPlaceZerosInBSS); 289 290 static cl::opt<bool> EnableAIXExtendedAltivecABI( 291 "vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."), 292 cl::init(false)); 293 CGBINDOPT(EnableAIXExtendedAltivecABI); 294 295 static cl::opt<bool> EnableGuaranteedTailCallOpt( 296 "tailcallopt", 297 cl::desc( 298 "Turn fastcc calls into tail calls by (potentially) changing ABI."), 299 cl::init(false)); 300 CGBINDOPT(EnableGuaranteedTailCallOpt); 301 302 static cl::opt<bool> DisableTailCalls( 303 "disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false)); 304 CGBINDOPT(DisableTailCalls); 305 306 static cl::opt<bool> StackSymbolOrdering( 307 "stack-symbol-ordering", cl::desc("Order local stack symbols."), 308 cl::init(true)); 309 CGBINDOPT(StackSymbolOrdering); 310 311 static cl::opt<unsigned> OverrideStackAlignment( 312 "stack-alignment", cl::desc("Override default stack alignment"), 313 cl::init(0)); 314 CGBINDOPT(OverrideStackAlignment); 315 316 static cl::opt<bool> StackRealign( 317 "stackrealign", 318 cl::desc("Force align the stack to the minimum alignment"), 319 cl::init(false)); 320 CGBINDOPT(StackRealign); 321 322 static cl::opt<std::string> TrapFuncName( 323 "trap-func", cl::Hidden, 324 cl::desc("Emit a call to trap function rather than a trap instruction"), 325 cl::init("")); 326 CGBINDOPT(TrapFuncName); 327 328 static cl::opt<bool> UseCtors("use-ctors", 329 cl::desc("Use .ctors instead of .init_array."), 330 cl::init(false)); 331 CGBINDOPT(UseCtors); 332 333 static cl::opt<bool> RelaxELFRelocations( 334 "relax-elf-relocations", 335 cl::desc( 336 "Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"), 337 cl::init(false)); 338 CGBINDOPT(RelaxELFRelocations); 339 340 static cl::opt<bool> DataSections( 341 "data-sections", cl::desc("Emit data into separate sections"), 342 cl::init(false)); 343 CGBINDOPT(DataSections); 344 345 static cl::opt<bool> FunctionSections( 346 "function-sections", cl::desc("Emit functions into separate sections"), 347 cl::init(false)); 348 CGBINDOPT(FunctionSections); 349 350 static cl::opt<bool> IgnoreXCOFFVisibility( 351 "ignore-xcoff-visibility", 352 cl::desc("Not emit the visibility attribute for asm in AIX OS or give " 353 "all symbols 'unspecified' visibility in XCOFF object file"), 354 cl::init(false)); 355 CGBINDOPT(IgnoreXCOFFVisibility); 356 357 static cl::opt<bool> XCOFFTracebackTable( 358 "xcoff-traceback-table", cl::desc("Emit the XCOFF traceback table"), 359 cl::init(true)); 360 CGBINDOPT(XCOFFTracebackTable); 361 362 static cl::opt<std::string> BBSections( 363 "basic-block-sections", 364 cl::desc("Emit basic blocks into separate sections"), 365 cl::value_desc("all | <function list (file)> | labels | none"), 366 cl::init("none")); 367 CGBINDOPT(BBSections); 368 369 static cl::opt<std::string> StackProtectorGuard( 370 "stack-protector-guard", cl::desc("Stack protector guard mode"), 371 cl::init("none")); 372 CGBINDOPT(StackProtectorGuard); 373 374 static cl::opt<std::string> StackProtectorGuardReg( 375 "stack-protector-guard-reg", cl::desc("Stack protector guard register"), 376 cl::init("none")); 377 CGBINDOPT(StackProtectorGuardReg); 378 379 static cl::opt<int> StackProtectorGuardOffset( 380 "stack-protector-guard-offset", cl::desc("Stack protector guard offset"), 381 cl::init(INT_MAX)); 382 CGBINDOPT(StackProtectorGuardOffset); 383 384 static cl::opt<unsigned> TLSSize( 385 "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0)); 386 CGBINDOPT(TLSSize); 387 388 static cl::opt<bool> EmulatedTLS( 389 "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false)); 390 CGBINDOPT(EmulatedTLS); 391 392 static cl::opt<bool> UniqueSectionNames( 393 "unique-section-names", cl::desc("Give unique names to every section"), 394 cl::init(true)); 395 CGBINDOPT(UniqueSectionNames); 396 397 static cl::opt<bool> UniqueBasicBlockSectionNames( 398 "unique-basic-block-section-names", 399 cl::desc("Give unique names to every basic block section"), 400 cl::init(false)); 401 CGBINDOPT(UniqueBasicBlockSectionNames); 402 403 static cl::opt<EABI> EABIVersion( 404 "meabi", cl::desc("Set EABI type (default depends on triple):"), 405 cl::init(EABI::Default), 406 cl::values( 407 clEnumValN(EABI::Default, "default", "Triple default EABI version"), 408 clEnumValN(EABI::EABI4, "4", "EABI version 4"), 409 clEnumValN(EABI::EABI5, "5", "EABI version 5"), 410 clEnumValN(EABI::GNU, "gnu", "EABI GNU"))); 411 CGBINDOPT(EABIVersion); 412 413 static cl::opt<DebuggerKind> DebuggerTuningOpt( 414 "debugger-tune", cl::desc("Tune debug info for a particular debugger"), 415 cl::init(DebuggerKind::Default), 416 cl::values( 417 clEnumValN(DebuggerKind::GDB, "gdb", "gdb"), 418 clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"), 419 clEnumValN(DebuggerKind::DBX, "dbx", "dbx"), 420 clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)"))); 421 CGBINDOPT(DebuggerTuningOpt); 422 423 static cl::opt<bool> EnableStackSizeSection( 424 "stack-size-section", 425 cl::desc("Emit a section containing stack size metadata"), 426 cl::init(false)); 427 CGBINDOPT(EnableStackSizeSection); 428 429 static cl::opt<bool> EnableAddrsig( 430 "addrsig", cl::desc("Emit an address-significance table"), 431 cl::init(false)); 432 CGBINDOPT(EnableAddrsig); 433 434 static cl::opt<bool> EmitCallSiteInfo( 435 "emit-call-site-info", 436 cl::desc( 437 "Emit call site debug information, if debug information is enabled."), 438 cl::init(false)); 439 CGBINDOPT(EmitCallSiteInfo); 440 441 static cl::opt<bool> EnableDebugEntryValues( 442 "debug-entry-values", 443 cl::desc("Enable debug info for the debug entry values."), 444 cl::init(false)); 445 CGBINDOPT(EnableDebugEntryValues); 446 447 static cl::opt<bool> PseudoProbeForProfiling( 448 "pseudo-probe-for-profiling", cl::desc("Emit pseudo probes for AutoFDO"), 449 cl::init(false)); 450 CGBINDOPT(PseudoProbeForProfiling); 451 452 static cl::opt<bool> ValueTrackingVariableLocations( 453 "experimental-debug-variable-locations", 454 cl::desc("Use experimental new value-tracking variable locations"), 455 cl::init(false)); 456 CGBINDOPT(ValueTrackingVariableLocations); 457 458 static cl::opt<bool> EnableMachineFunctionSplitter( 459 "split-machine-functions", 460 cl::desc("Split out cold basic blocks from machine functions based on " 461 "profile information"), 462 cl::init(false)); 463 CGBINDOPT(EnableMachineFunctionSplitter); 464 465 static cl::opt<bool> ForceDwarfFrameSection( 466 "force-dwarf-frame-section", 467 cl::desc("Always emit a debug frame section."), cl::init(false)); 468 CGBINDOPT(ForceDwarfFrameSection); 469 470 static cl::opt<bool> XRayOmitFunctionIndex( 471 "no-xray-index", cl::desc("Don't emit xray_fn_idx section"), 472 cl::init(false)); 473 CGBINDOPT(XRayOmitFunctionIndex); 474 475 static cl::opt<bool> DebugStrictDwarf( 476 "strict-dwarf", cl::desc("use strict dwarf"), cl::init(false)); 477 CGBINDOPT(DebugStrictDwarf); 478 479 #undef CGBINDOPT 480 481 mc::RegisterMCTargetOptionsFlags(); 482 } 483 484 llvm::BasicBlockSection 485 codegen::getBBSectionsMode(llvm::TargetOptions &Options) { 486 if (getBBSections() == "all") 487 return BasicBlockSection::All; 488 else if (getBBSections() == "labels") 489 return BasicBlockSection::Labels; 490 else if (getBBSections() == "none") 491 return BasicBlockSection::None; 492 else { 493 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = 494 MemoryBuffer::getFile(getBBSections()); 495 if (!MBOrErr) { 496 errs() << "Error loading basic block sections function list file: " 497 << MBOrErr.getError().message() << "\n"; 498 } else { 499 Options.BBSectionsFuncListBuf = std::move(*MBOrErr); 500 } 501 return BasicBlockSection::List; 502 } 503 } 504 505 llvm::StackProtectorGuards 506 codegen::getStackProtectorGuardMode(llvm::TargetOptions &Options) { 507 if (getStackProtectorGuard() == "tls") 508 return StackProtectorGuards::TLS; 509 if (getStackProtectorGuard() == "global") 510 return StackProtectorGuards::Global; 511 if (getStackProtectorGuard() != "none") { 512 ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr = 513 MemoryBuffer::getFile(getStackProtectorGuard()); 514 if (!MBOrErr) 515 errs() << "error illegal stack protector guard mode: " 516 << MBOrErr.getError().message() << "\n"; 517 else 518 Options.BBSectionsFuncListBuf = std::move(*MBOrErr); 519 } 520 return StackProtectorGuards::None; 521 } 522 523 // Common utility function tightly tied to the options listed here. Initializes 524 // a TargetOptions object with CodeGen flags and returns it. 525 TargetOptions 526 codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) { 527 TargetOptions Options; 528 Options.AllowFPOpFusion = getFuseFPOps(); 529 Options.UnsafeFPMath = getEnableUnsafeFPMath(); 530 Options.NoInfsFPMath = getEnableNoInfsFPMath(); 531 Options.NoNaNsFPMath = getEnableNoNaNsFPMath(); 532 Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath(); 533 Options.NoTrappingFPMath = getEnableNoTrappingFPMath(); 534 535 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath(); 536 537 // FIXME: Should have separate input and output flags 538 Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind)); 539 540 Options.HonorSignDependentRoundingFPMathOption = 541 getEnableHonorSignDependentRoundingFPMath(); 542 if (getFloatABIForCalls() != FloatABI::Default) 543 Options.FloatABIType = getFloatABIForCalls(); 544 Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI(); 545 Options.NoZerosInBSS = getDontPlaceZerosInBSS(); 546 Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt(); 547 Options.StackAlignmentOverride = getOverrideStackAlignment(); 548 Options.StackSymbolOrdering = getStackSymbolOrdering(); 549 Options.UseInitArray = !getUseCtors(); 550 Options.RelaxELFRelocations = getRelaxELFRelocations(); 551 Options.DataSections = 552 getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections()); 553 Options.FunctionSections = getFunctionSections(); 554 Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility(); 555 Options.XCOFFTracebackTable = getXCOFFTracebackTable(); 556 Options.BBSections = getBBSectionsMode(Options); 557 Options.UniqueSectionNames = getUniqueSectionNames(); 558 Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames(); 559 Options.StackProtectorGuard = getStackProtectorGuardMode(Options); 560 Options.StackProtectorGuardOffset = getStackProtectorGuardOffset(); 561 Options.StackProtectorGuardReg = getStackProtectorGuardReg(); 562 Options.TLSSize = getTLSSize(); 563 Options.EmulatedTLS = getEmulatedTLS(); 564 Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0; 565 Options.ExceptionModel = getExceptionModel(); 566 Options.EmitStackSizeSection = getEnableStackSizeSection(); 567 Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter(); 568 Options.EmitAddrsig = getEnableAddrsig(); 569 Options.EmitCallSiteInfo = getEmitCallSiteInfo(); 570 Options.EnableDebugEntryValues = getEnableDebugEntryValues(); 571 Options.PseudoProbeForProfiling = getPseudoProbeForProfiling(); 572 Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations(); 573 Options.ForceDwarfFrameSection = getForceDwarfFrameSection(); 574 Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex(); 575 Options.DebugStrictDwarf = getDebugStrictDwarf(); 576 577 Options.MCOptions = mc::InitMCTargetOptionsFromFlags(); 578 579 Options.ThreadModel = getThreadModel(); 580 Options.EABIVersion = getEABIVersion(); 581 Options.DebuggerTuning = getDebuggerTuningOpt(); 582 583 return Options; 584 } 585 586 std::string codegen::getCPUStr() { 587 // If user asked for the 'native' CPU, autodetect here. If autodection fails, 588 // this will set the CPU to an empty string which tells the target to 589 // pick a basic default. 590 if (getMCPU() == "native") 591 return std::string(sys::getHostCPUName()); 592 593 return getMCPU(); 594 } 595 596 std::string codegen::getFeaturesStr() { 597 SubtargetFeatures Features; 598 599 // If user asked for the 'native' CPU, we need to autodetect features. 600 // This is necessary for x86 where the CPU might not support all the 601 // features the autodetected CPU name lists in the target. For example, 602 // not all Sandybridge processors support AVX. 603 if (getMCPU() == "native") { 604 StringMap<bool> HostFeatures; 605 if (sys::getHostCPUFeatures(HostFeatures)) 606 for (auto &F : HostFeatures) 607 Features.AddFeature(F.first(), F.second); 608 } 609 610 for (auto const &MAttr : getMAttrs()) 611 Features.AddFeature(MAttr); 612 613 return Features.getString(); 614 } 615 616 std::vector<std::string> codegen::getFeatureList() { 617 SubtargetFeatures Features; 618 619 // If user asked for the 'native' CPU, we need to autodetect features. 620 // This is necessary for x86 where the CPU might not support all the 621 // features the autodetected CPU name lists in the target. For example, 622 // not all Sandybridge processors support AVX. 623 if (getMCPU() == "native") { 624 StringMap<bool> HostFeatures; 625 if (sys::getHostCPUFeatures(HostFeatures)) 626 for (auto &F : HostFeatures) 627 Features.AddFeature(F.first(), F.second); 628 } 629 630 for (auto const &MAttr : getMAttrs()) 631 Features.AddFeature(MAttr); 632 633 return Features.getFeatures(); 634 } 635 636 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) { 637 B.addAttribute(Name, Val ? "true" : "false"); 638 } 639 640 #define HANDLE_BOOL_ATTR(CL, AttrName) \ 641 do { \ 642 if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName)) \ 643 renderBoolStringAttr(NewAttrs, AttrName, *CL); \ 644 } while (0) 645 646 /// Set function attributes of function \p F based on CPU, Features, and command 647 /// line flags. 648 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features, 649 Function &F) { 650 auto &Ctx = F.getContext(); 651 AttributeList Attrs = F.getAttributes(); 652 AttrBuilder NewAttrs; 653 654 if (!CPU.empty() && !F.hasFnAttribute("target-cpu")) 655 NewAttrs.addAttribute("target-cpu", CPU); 656 if (!Features.empty()) { 657 // Append the command line features to any that are already on the function. 658 StringRef OldFeatures = 659 F.getFnAttribute("target-features").getValueAsString(); 660 if (OldFeatures.empty()) 661 NewAttrs.addAttribute("target-features", Features); 662 else { 663 SmallString<256> Appended(OldFeatures); 664 Appended.push_back(','); 665 Appended.append(Features); 666 NewAttrs.addAttribute("target-features", Appended); 667 } 668 } 669 if (FramePointerUsageView->getNumOccurrences() > 0 && 670 !F.hasFnAttribute("frame-pointer")) { 671 if (getFramePointerUsage() == FramePointerKind::All) 672 NewAttrs.addAttribute("frame-pointer", "all"); 673 else if (getFramePointerUsage() == FramePointerKind::NonLeaf) 674 NewAttrs.addAttribute("frame-pointer", "non-leaf"); 675 else if (getFramePointerUsage() == FramePointerKind::None) 676 NewAttrs.addAttribute("frame-pointer", "none"); 677 } 678 if (DisableTailCallsView->getNumOccurrences() > 0) 679 NewAttrs.addAttribute("disable-tail-calls", 680 toStringRef(getDisableTailCalls())); 681 if (getStackRealign()) 682 NewAttrs.addAttribute("stackrealign"); 683 684 HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math"); 685 HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math"); 686 HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math"); 687 HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math"); 688 689 if (DenormalFPMathView->getNumOccurrences() > 0 && 690 !F.hasFnAttribute("denormal-fp-math")) { 691 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath(); 692 693 // FIXME: Command line flag should expose separate input/output modes. 694 NewAttrs.addAttribute("denormal-fp-math", 695 DenormalMode(DenormKind, DenormKind).str()); 696 } 697 698 if (DenormalFP32MathView->getNumOccurrences() > 0 && 699 !F.hasFnAttribute("denormal-fp-math-f32")) { 700 // FIXME: Command line flag should expose separate input/output modes. 701 DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math(); 702 703 NewAttrs.addAttribute( 704 "denormal-fp-math-f32", 705 DenormalMode(DenormKind, DenormKind).str()); 706 } 707 708 if (TrapFuncNameView->getNumOccurrences() > 0) 709 for (auto &B : F) 710 for (auto &I : B) 711 if (auto *Call = dyn_cast<CallInst>(&I)) 712 if (const auto *F = Call->getCalledFunction()) 713 if (F->getIntrinsicID() == Intrinsic::debugtrap || 714 F->getIntrinsicID() == Intrinsic::trap) 715 Call->addAttribute( 716 AttributeList::FunctionIndex, 717 Attribute::get(Ctx, "trap-func-name", getTrapFuncName())); 718 719 // Let NewAttrs override Attrs. 720 F.setAttributes( 721 Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs)); 722 } 723 724 /// Set function attributes of functions in Module M based on CPU, 725 /// Features, and command line flags. 726 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features, 727 Module &M) { 728 for (Function &F : M) 729 setFunctionAttributes(CPU, Features, F); 730 } 731