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/ADT/StringExtras.h" 17 #include "llvm/ADT/Triple.h" 18 #include "llvm/IR/Instructions.h" 19 #include "llvm/IR/Intrinsics.h" 20 #include "llvm/IR/Module.h" 21 #include "llvm/MC/MCTargetOptionsCommandFlags.h" 22 #include "llvm/MC/SubtargetFeature.h" 23 #include "llvm/Support/CommandLine.h" 24 #include "llvm/Support/Host.h" 25 #include "llvm/Support/MemoryBuffer.h" 26 27 using namespace llvm; 28 29 #define CGOPT(TY, NAME) \ 30 static cl::opt<TY> *NAME##View; \ 31 TY codegen::get##NAME() { \ 32 assert(NAME##View && "RegisterCodeGenFlags not created."); \ 33 return *NAME##View; \ 34 } 35 36 #define CGLIST(TY, NAME) \ 37 static cl::list<TY> *NAME##View; \ 38 std::vector<TY> codegen::get##NAME() { \ 39 assert(NAME##View && "RegisterCodeGenFlags not created."); \ 40 return *NAME##View; \ 41 } 42 43 #define CGOPT_EXP(TY, NAME) \ 44 CGOPT(TY, NAME) \ 45 Optional<TY> codegen::getExplicit##NAME() { \ 46 if (NAME##View->getNumOccurrences()) { \ 47 TY res = *NAME##View; \ 48 return res; \ 49 } \ 50 return None; \ 51 } 52 53 CGOPT(std::string, MArch) 54 CGOPT(std::string, MCPU) 55 CGLIST(std::string, MAttrs) 56 CGOPT_EXP(Reloc::Model, RelocModel) 57 CGOPT(ThreadModel::Model, ThreadModel) 58 CGOPT_EXP(CodeModel::Model, CodeModel) 59 CGOPT(ExceptionHandling, ExceptionModel) 60 CGOPT_EXP(CodeGenFileType, FileType) 61 CGOPT(FramePointerKind, FramePointerUsage) 62 CGOPT(bool, EnableUnsafeFPMath) 63 CGOPT(bool, EnableNoInfsFPMath) 64 CGOPT(bool, EnableNoNaNsFPMath) 65 CGOPT(bool, EnableNoSignedZerosFPMath) 66 CGOPT(bool, EnableApproxFuncFPMath) 67 CGOPT(bool, EnableNoTrappingFPMath) 68 CGOPT(bool, EnableAIXExtendedAltivecABI) 69 CGOPT(DenormalMode::DenormalModeKind, DenormalFPMath) 70 CGOPT(DenormalMode::DenormalModeKind, DenormalFP32Math) 71 CGOPT(bool, EnableHonorSignDependentRoundingFPMath) 72 CGOPT(FloatABI::ABIType, FloatABIForCalls) 73 CGOPT(FPOpFusion::FPOpFusionMode, FuseFPOps) 74 CGOPT(SwiftAsyncFramePointerMode, SwiftAsyncFramePointer) 75 CGOPT(bool, DontPlaceZerosInBSS) 76 CGOPT(bool, EnableGuaranteedTailCallOpt) 77 CGOPT(bool, DisableTailCalls) 78 CGOPT(bool, StackSymbolOrdering) 79 CGOPT(bool, StackRealign) 80 CGOPT(std::string, TrapFuncName) 81 CGOPT(bool, UseCtors) 82 CGOPT(bool, RelaxELFRelocations) 83 CGOPT_EXP(bool, DataSections) 84 CGOPT_EXP(bool, FunctionSections) 85 CGOPT(bool, IgnoreXCOFFVisibility) 86 CGOPT(bool, XCOFFTracebackTable) 87 CGOPT(std::string, BBSections) 88 CGOPT(unsigned, TLSSize) 89 CGOPT(bool, EmulatedTLS) 90 CGOPT(bool, UniqueSectionNames) 91 CGOPT(bool, UniqueBasicBlockSectionNames) 92 CGOPT(EABI, EABIVersion) 93 CGOPT(DebuggerKind, DebuggerTuningOpt) 94 CGOPT(bool, EnableStackSizeSection) 95 CGOPT(bool, EnableAddrsig) 96 CGOPT(bool, EmitCallSiteInfo) 97 CGOPT(bool, EnableMachineFunctionSplitter) 98 CGOPT(bool, EnableDebugEntryValues) 99 CGOPT(bool, ForceDwarfFrameSection) 100 CGOPT(bool, XRayOmitFunctionIndex) 101 CGOPT(bool, DebugStrictDwarf) 102 CGOPT(unsigned, AlignLoops) 103 CGOPT(bool, JMCInstrument) 104 105 codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() { 106 #define CGBINDOPT(NAME) \ 107 do { \ 108 NAME##View = std::addressof(NAME); \ 109 } while (0) 110 111 static cl::opt<std::string> MArch( 112 "march", cl::desc("Architecture to generate code for (see --version)")); 113 CGBINDOPT(MArch); 114 115 static cl::opt<std::string> MCPU( 116 "mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"), 117 cl::value_desc("cpu-name"), cl::init("")); 118 CGBINDOPT(MCPU); 119 120 static cl::list<std::string> MAttrs( 121 "mattr", cl::CommaSeparated, 122 cl::desc("Target specific attributes (-mattr=help for details)"), 123 cl::value_desc("a1,+a2,-a3,...")); 124 CGBINDOPT(MAttrs); 125 126 static cl::opt<Reloc::Model> RelocModel( 127 "relocation-model", cl::desc("Choose relocation model"), 128 cl::values( 129 clEnumValN(Reloc::Static, "static", "Non-relocatable code"), 130 clEnumValN(Reloc::PIC_, "pic", 131 "Fully relocatable, position independent code"), 132 clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", 133 "Relocatable external references, non-relocatable code"), 134 clEnumValN( 135 Reloc::ROPI, "ropi", 136 "Code and read-only data relocatable, accessed PC-relative"), 137 clEnumValN( 138 Reloc::RWPI, "rwpi", 139 "Read-write data relocatable, accessed relative to static base"), 140 clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi", 141 "Combination of ropi and rwpi"))); 142 CGBINDOPT(RelocModel); 143 144 static cl::opt<ThreadModel::Model> ThreadModel( 145 "thread-model", cl::desc("Choose threading model"), 146 cl::init(ThreadModel::POSIX), 147 cl::values( 148 clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"), 149 clEnumValN(ThreadModel::Single, "single", "Single thread model"))); 150 CGBINDOPT(ThreadModel); 151 152 static cl::opt<CodeModel::Model> CodeModel( 153 "code-model", cl::desc("Choose code model"), 154 cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"), 155 clEnumValN(CodeModel::Small, "small", "Small code model"), 156 clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"), 157 clEnumValN(CodeModel::Medium, "medium", "Medium code model"), 158 clEnumValN(CodeModel::Large, "large", "Large code model"))); 159 CGBINDOPT(CodeModel); 160 161 static cl::opt<ExceptionHandling> ExceptionModel( 162 "exception-model", cl::desc("exception model"), 163 cl::init(ExceptionHandling::None), 164 cl::values( 165 clEnumValN(ExceptionHandling::None, "default", 166 "default exception handling model"), 167 clEnumValN(ExceptionHandling::DwarfCFI, "dwarf", 168 "DWARF-like CFI based exception handling"), 169 clEnumValN(ExceptionHandling::SjLj, "sjlj", 170 "SjLj exception handling"), 171 clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"), 172 clEnumValN(ExceptionHandling::WinEH, "wineh", 173 "Windows exception model"), 174 clEnumValN(ExceptionHandling::Wasm, "wasm", 175 "WebAssembly exception handling"))); 176 CGBINDOPT(ExceptionModel); 177 178 static cl::opt<CodeGenFileType> FileType( 179 "filetype", cl::init(CGFT_AssemblyFile), 180 cl::desc( 181 "Choose a file type (not all types are supported by all targets):"), 182 cl::values( 183 clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"), 184 clEnumValN(CGFT_ObjectFile, "obj", 185 "Emit a native object ('.o') file"), 186 clEnumValN(CGFT_Null, "null", 187 "Emit nothing, for performance testing"))); 188 CGBINDOPT(FileType); 189 190 static cl::opt<FramePointerKind> FramePointerUsage( 191 "frame-pointer", 192 cl::desc("Specify frame pointer elimination optimization"), 193 cl::init(FramePointerKind::None), 194 cl::values( 195 clEnumValN(FramePointerKind::All, "all", 196 "Disable frame pointer elimination"), 197 clEnumValN(FramePointerKind::NonLeaf, "non-leaf", 198 "Disable frame pointer elimination for non-leaf frame"), 199 clEnumValN(FramePointerKind::None, "none", 200 "Enable frame pointer elimination"))); 201 CGBINDOPT(FramePointerUsage); 202 203 static cl::opt<bool> EnableUnsafeFPMath( 204 "enable-unsafe-fp-math", 205 cl::desc("Enable optimizations that may decrease FP precision"), 206 cl::init(false)); 207 CGBINDOPT(EnableUnsafeFPMath); 208 209 static cl::opt<bool> EnableNoInfsFPMath( 210 "enable-no-infs-fp-math", 211 cl::desc("Enable FP math optimizations that assume no +-Infs"), 212 cl::init(false)); 213 CGBINDOPT(EnableNoInfsFPMath); 214 215 static cl::opt<bool> EnableNoNaNsFPMath( 216 "enable-no-nans-fp-math", 217 cl::desc("Enable FP math optimizations that assume no NaNs"), 218 cl::init(false)); 219 CGBINDOPT(EnableNoNaNsFPMath); 220 221 static cl::opt<bool> EnableNoSignedZerosFPMath( 222 "enable-no-signed-zeros-fp-math", 223 cl::desc("Enable FP math optimizations that assume " 224 "the sign of 0 is insignificant"), 225 cl::init(false)); 226 CGBINDOPT(EnableNoSignedZerosFPMath); 227 228 static cl::opt<bool> EnableApproxFuncFPMath( 229 "enable-approx-func-fp-math", 230 cl::desc("Enable FP math optimizations that assume approx func"), 231 cl::init(false)); 232 CGBINDOPT(EnableApproxFuncFPMath); 233 234 static cl::opt<bool> EnableNoTrappingFPMath( 235 "enable-no-trapping-fp-math", 236 cl::desc("Enable setting the FP exceptions build " 237 "attribute not to use exceptions"), 238 cl::init(false)); 239 CGBINDOPT(EnableNoTrappingFPMath); 240 241 static const auto DenormFlagEnumOptions = 242 cl::values(clEnumValN(DenormalMode::IEEE, "ieee", 243 "IEEE 754 denormal numbers"), 244 clEnumValN(DenormalMode::PreserveSign, "preserve-sign", 245 "the sign of a flushed-to-zero number is preserved " 246 "in the sign of 0"), 247 clEnumValN(DenormalMode::PositiveZero, "positive-zero", 248 "denormals are flushed to positive zero")); 249 250 // FIXME: Doesn't have way to specify separate input and output modes. 251 static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath( 252 "denormal-fp-math", 253 cl::desc("Select which denormal numbers the code is permitted to require"), 254 cl::init(DenormalMode::IEEE), 255 DenormFlagEnumOptions); 256 CGBINDOPT(DenormalFPMath); 257 258 static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math( 259 "denormal-fp-math-f32", 260 cl::desc("Select which denormal numbers the code is permitted to require for float"), 261 cl::init(DenormalMode::Invalid), 262 DenormFlagEnumOptions); 263 CGBINDOPT(DenormalFP32Math); 264 265 static cl::opt<bool> EnableHonorSignDependentRoundingFPMath( 266 "enable-sign-dependent-rounding-fp-math", cl::Hidden, 267 cl::desc("Force codegen to assume rounding mode can change dynamically"), 268 cl::init(false)); 269 CGBINDOPT(EnableHonorSignDependentRoundingFPMath); 270 271 static cl::opt<FloatABI::ABIType> FloatABIForCalls( 272 "float-abi", cl::desc("Choose float ABI type"), 273 cl::init(FloatABI::Default), 274 cl::values(clEnumValN(FloatABI::Default, "default", 275 "Target default float ABI type"), 276 clEnumValN(FloatABI::Soft, "soft", 277 "Soft float ABI (implied by -soft-float)"), 278 clEnumValN(FloatABI::Hard, "hard", 279 "Hard float ABI (uses FP registers)"))); 280 CGBINDOPT(FloatABIForCalls); 281 282 static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps( 283 "fp-contract", cl::desc("Enable aggressive formation of fused FP ops"), 284 cl::init(FPOpFusion::Standard), 285 cl::values( 286 clEnumValN(FPOpFusion::Fast, "fast", 287 "Fuse FP ops whenever profitable"), 288 clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."), 289 clEnumValN(FPOpFusion::Strict, "off", 290 "Only fuse FP ops when the result won't be affected."))); 291 CGBINDOPT(FuseFPOps); 292 293 static cl::opt<SwiftAsyncFramePointerMode> SwiftAsyncFramePointer( 294 "swift-async-fp", 295 cl::desc("Determine when the Swift async frame pointer should be set"), 296 cl::init(SwiftAsyncFramePointerMode::Always), 297 cl::values(clEnumValN(SwiftAsyncFramePointerMode::DeploymentBased, "auto", 298 "Determine based on deployment target"), 299 clEnumValN(SwiftAsyncFramePointerMode::Always, "always", 300 "Always set the bit"), 301 clEnumValN(SwiftAsyncFramePointerMode::Never, "never", 302 "Never set the bit"))); 303 CGBINDOPT(SwiftAsyncFramePointer); 304 305 static cl::opt<bool> DontPlaceZerosInBSS( 306 "nozero-initialized-in-bss", 307 cl::desc("Don't place zero-initialized symbols into bss section"), 308 cl::init(false)); 309 CGBINDOPT(DontPlaceZerosInBSS); 310 311 static cl::opt<bool> EnableAIXExtendedAltivecABI( 312 "vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."), 313 cl::init(false)); 314 CGBINDOPT(EnableAIXExtendedAltivecABI); 315 316 static cl::opt<bool> EnableGuaranteedTailCallOpt( 317 "tailcallopt", 318 cl::desc( 319 "Turn fastcc calls into tail calls by (potentially) changing ABI."), 320 cl::init(false)); 321 CGBINDOPT(EnableGuaranteedTailCallOpt); 322 323 static cl::opt<bool> DisableTailCalls( 324 "disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false)); 325 CGBINDOPT(DisableTailCalls); 326 327 static cl::opt<bool> StackSymbolOrdering( 328 "stack-symbol-ordering", cl::desc("Order local stack symbols."), 329 cl::init(true)); 330 CGBINDOPT(StackSymbolOrdering); 331 332 static cl::opt<bool> StackRealign( 333 "stackrealign", 334 cl::desc("Force align the stack to the minimum alignment"), 335 cl::init(false)); 336 CGBINDOPT(StackRealign); 337 338 static cl::opt<std::string> TrapFuncName( 339 "trap-func", cl::Hidden, 340 cl::desc("Emit a call to trap function rather than a trap instruction"), 341 cl::init("")); 342 CGBINDOPT(TrapFuncName); 343 344 static cl::opt<bool> UseCtors("use-ctors", 345 cl::desc("Use .ctors instead of .init_array."), 346 cl::init(false)); 347 CGBINDOPT(UseCtors); 348 349 static cl::opt<bool> RelaxELFRelocations( 350 "relax-elf-relocations", 351 cl::desc( 352 "Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"), 353 cl::init(false)); 354 CGBINDOPT(RelaxELFRelocations); 355 356 static cl::opt<bool> DataSections( 357 "data-sections", cl::desc("Emit data into separate sections"), 358 cl::init(false)); 359 CGBINDOPT(DataSections); 360 361 static cl::opt<bool> FunctionSections( 362 "function-sections", cl::desc("Emit functions into separate sections"), 363 cl::init(false)); 364 CGBINDOPT(FunctionSections); 365 366 static cl::opt<bool> IgnoreXCOFFVisibility( 367 "ignore-xcoff-visibility", 368 cl::desc("Not emit the visibility attribute for asm in AIX OS or give " 369 "all symbols 'unspecified' visibility in XCOFF object file"), 370 cl::init(false)); 371 CGBINDOPT(IgnoreXCOFFVisibility); 372 373 static cl::opt<bool> XCOFFTracebackTable( 374 "xcoff-traceback-table", cl::desc("Emit the XCOFF traceback table"), 375 cl::init(true)); 376 CGBINDOPT(XCOFFTracebackTable); 377 378 static cl::opt<std::string> BBSections( 379 "basic-block-sections", 380 cl::desc("Emit basic blocks into separate sections"), 381 cl::value_desc("all | <function list (file)> | labels | none"), 382 cl::init("none")); 383 CGBINDOPT(BBSections); 384 385 static cl::opt<unsigned> TLSSize( 386 "tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0)); 387 CGBINDOPT(TLSSize); 388 389 static cl::opt<bool> EmulatedTLS( 390 "emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false)); 391 CGBINDOPT(EmulatedTLS); 392 393 static cl::opt<bool> UniqueSectionNames( 394 "unique-section-names", cl::desc("Give unique names to every section"), 395 cl::init(true)); 396 CGBINDOPT(UniqueSectionNames); 397 398 static cl::opt<bool> UniqueBasicBlockSectionNames( 399 "unique-basic-block-section-names", 400 cl::desc("Give unique names to every basic block section"), 401 cl::init(false)); 402 CGBINDOPT(UniqueBasicBlockSectionNames); 403 404 static cl::opt<EABI> EABIVersion( 405 "meabi", cl::desc("Set EABI type (default depends on triple):"), 406 cl::init(EABI::Default), 407 cl::values( 408 clEnumValN(EABI::Default, "default", "Triple default EABI version"), 409 clEnumValN(EABI::EABI4, "4", "EABI version 4"), 410 clEnumValN(EABI::EABI5, "5", "EABI version 5"), 411 clEnumValN(EABI::GNU, "gnu", "EABI GNU"))); 412 CGBINDOPT(EABIVersion); 413 414 static cl::opt<DebuggerKind> DebuggerTuningOpt( 415 "debugger-tune", cl::desc("Tune debug info for a particular debugger"), 416 cl::init(DebuggerKind::Default), 417 cl::values( 418 clEnumValN(DebuggerKind::GDB, "gdb", "gdb"), 419 clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"), 420 clEnumValN(DebuggerKind::DBX, "dbx", "dbx"), 421 clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)"))); 422 CGBINDOPT(DebuggerTuningOpt); 423 424 static cl::opt<bool> EnableStackSizeSection( 425 "stack-size-section", 426 cl::desc("Emit a section containing stack size metadata"), 427 cl::init(false)); 428 CGBINDOPT(EnableStackSizeSection); 429 430 static cl::opt<bool> EnableAddrsig( 431 "addrsig", cl::desc("Emit an address-significance table"), 432 cl::init(false)); 433 CGBINDOPT(EnableAddrsig); 434 435 static cl::opt<bool> EmitCallSiteInfo( 436 "emit-call-site-info", 437 cl::desc( 438 "Emit call site debug information, if debug information is enabled."), 439 cl::init(false)); 440 CGBINDOPT(EmitCallSiteInfo); 441 442 static cl::opt<bool> EnableDebugEntryValues( 443 "debug-entry-values", 444 cl::desc("Enable debug info for the debug entry values."), 445 cl::init(false)); 446 CGBINDOPT(EnableDebugEntryValues); 447 448 static cl::opt<bool> EnableMachineFunctionSplitter( 449 "split-machine-functions", 450 cl::desc("Split out cold basic blocks from machine functions based on " 451 "profile information"), 452 cl::init(false)); 453 CGBINDOPT(EnableMachineFunctionSplitter); 454 455 static cl::opt<bool> ForceDwarfFrameSection( 456 "force-dwarf-frame-section", 457 cl::desc("Always emit a debug frame section."), cl::init(false)); 458 CGBINDOPT(ForceDwarfFrameSection); 459 460 static cl::opt<bool> XRayOmitFunctionIndex( 461 "no-xray-index", cl::desc("Don't emit xray_fn_idx section"), 462 cl::init(false)); 463 CGBINDOPT(XRayOmitFunctionIndex); 464 465 static cl::opt<bool> DebugStrictDwarf( 466 "strict-dwarf", cl::desc("use strict dwarf"), cl::init(false)); 467 CGBINDOPT(DebugStrictDwarf); 468 469 static cl::opt<unsigned> AlignLoops("align-loops", 470 cl::desc("Default alignment for loops")); 471 CGBINDOPT(AlignLoops); 472 473 static cl::opt<bool> JMCInstrument( 474 "enable-jmc-instrument", 475 cl::desc("Instrument functions with a call to __CheckForDebuggerJustMyCode"), 476 cl::init(false)); 477 CGBINDOPT(JMCInstrument); 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 // Common utility function tightly tied to the options listed here. Initializes 506 // a TargetOptions object with CodeGen flags and returns it. 507 TargetOptions 508 codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) { 509 TargetOptions Options; 510 Options.AllowFPOpFusion = getFuseFPOps(); 511 Options.UnsafeFPMath = getEnableUnsafeFPMath(); 512 Options.NoInfsFPMath = getEnableNoInfsFPMath(); 513 Options.NoNaNsFPMath = getEnableNoNaNsFPMath(); 514 Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath(); 515 Options.ApproxFuncFPMath = getEnableApproxFuncFPMath(); 516 Options.NoTrappingFPMath = getEnableNoTrappingFPMath(); 517 518 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath(); 519 520 // FIXME: Should have separate input and output flags 521 Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind)); 522 523 Options.HonorSignDependentRoundingFPMathOption = 524 getEnableHonorSignDependentRoundingFPMath(); 525 if (getFloatABIForCalls() != FloatABI::Default) 526 Options.FloatABIType = getFloatABIForCalls(); 527 Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI(); 528 Options.NoZerosInBSS = getDontPlaceZerosInBSS(); 529 Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt(); 530 Options.StackSymbolOrdering = getStackSymbolOrdering(); 531 Options.UseInitArray = !getUseCtors(); 532 Options.RelaxELFRelocations = getRelaxELFRelocations(); 533 Options.DataSections = 534 getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections()); 535 Options.FunctionSections = getFunctionSections(); 536 Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility(); 537 Options.XCOFFTracebackTable = getXCOFFTracebackTable(); 538 Options.BBSections = getBBSectionsMode(Options); 539 Options.UniqueSectionNames = getUniqueSectionNames(); 540 Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames(); 541 Options.TLSSize = getTLSSize(); 542 Options.EmulatedTLS = getEmulatedTLS(); 543 Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0; 544 Options.ExceptionModel = getExceptionModel(); 545 Options.EmitStackSizeSection = getEnableStackSizeSection(); 546 Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter(); 547 Options.EmitAddrsig = getEnableAddrsig(); 548 Options.EmitCallSiteInfo = getEmitCallSiteInfo(); 549 Options.EnableDebugEntryValues = getEnableDebugEntryValues(); 550 Options.ForceDwarfFrameSection = getForceDwarfFrameSection(); 551 Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex(); 552 Options.DebugStrictDwarf = getDebugStrictDwarf(); 553 Options.LoopAlignment = getAlignLoops(); 554 Options.JMCInstrument = getJMCInstrument(); 555 556 Options.MCOptions = mc::InitMCTargetOptionsFromFlags(); 557 558 Options.ThreadModel = getThreadModel(); 559 Options.EABIVersion = getEABIVersion(); 560 Options.DebuggerTuning = getDebuggerTuningOpt(); 561 Options.SwiftAsyncFramePointer = getSwiftAsyncFramePointer(); 562 return Options; 563 } 564 565 std::string codegen::getCPUStr() { 566 // If user asked for the 'native' CPU, autodetect here. If autodection fails, 567 // this will set the CPU to an empty string which tells the target to 568 // pick a basic default. 569 if (getMCPU() == "native") 570 return std::string(sys::getHostCPUName()); 571 572 return getMCPU(); 573 } 574 575 std::string codegen::getFeaturesStr() { 576 SubtargetFeatures Features; 577 578 // If user asked for the 'native' CPU, we need to autodetect features. 579 // This is necessary for x86 where the CPU might not support all the 580 // features the autodetected CPU name lists in the target. For example, 581 // not all Sandybridge processors support AVX. 582 if (getMCPU() == "native") { 583 StringMap<bool> HostFeatures; 584 if (sys::getHostCPUFeatures(HostFeatures)) 585 for (auto &F : HostFeatures) 586 Features.AddFeature(F.first(), F.second); 587 } 588 589 for (auto const &MAttr : getMAttrs()) 590 Features.AddFeature(MAttr); 591 592 return Features.getString(); 593 } 594 595 std::vector<std::string> codegen::getFeatureList() { 596 SubtargetFeatures Features; 597 598 // If user asked for the 'native' CPU, we need to autodetect features. 599 // This is necessary for x86 where the CPU might not support all the 600 // features the autodetected CPU name lists in the target. For example, 601 // not all Sandybridge processors support AVX. 602 if (getMCPU() == "native") { 603 StringMap<bool> HostFeatures; 604 if (sys::getHostCPUFeatures(HostFeatures)) 605 for (auto &F : HostFeatures) 606 Features.AddFeature(F.first(), F.second); 607 } 608 609 for (auto const &MAttr : getMAttrs()) 610 Features.AddFeature(MAttr); 611 612 return Features.getFeatures(); 613 } 614 615 void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) { 616 B.addAttribute(Name, Val ? "true" : "false"); 617 } 618 619 #define HANDLE_BOOL_ATTR(CL, AttrName) \ 620 do { \ 621 if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName)) \ 622 renderBoolStringAttr(NewAttrs, AttrName, *CL); \ 623 } while (0) 624 625 /// Set function attributes of function \p F based on CPU, Features, and command 626 /// line flags. 627 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features, 628 Function &F) { 629 auto &Ctx = F.getContext(); 630 AttributeList Attrs = F.getAttributes(); 631 AttrBuilder NewAttrs(Ctx); 632 633 if (!CPU.empty() && !F.hasFnAttribute("target-cpu")) 634 NewAttrs.addAttribute("target-cpu", CPU); 635 if (!Features.empty()) { 636 // Append the command line features to any that are already on the function. 637 StringRef OldFeatures = 638 F.getFnAttribute("target-features").getValueAsString(); 639 if (OldFeatures.empty()) 640 NewAttrs.addAttribute("target-features", Features); 641 else { 642 SmallString<256> Appended(OldFeatures); 643 Appended.push_back(','); 644 Appended.append(Features); 645 NewAttrs.addAttribute("target-features", Appended); 646 } 647 } 648 if (FramePointerUsageView->getNumOccurrences() > 0 && 649 !F.hasFnAttribute("frame-pointer")) { 650 if (getFramePointerUsage() == FramePointerKind::All) 651 NewAttrs.addAttribute("frame-pointer", "all"); 652 else if (getFramePointerUsage() == FramePointerKind::NonLeaf) 653 NewAttrs.addAttribute("frame-pointer", "non-leaf"); 654 else if (getFramePointerUsage() == FramePointerKind::None) 655 NewAttrs.addAttribute("frame-pointer", "none"); 656 } 657 if (DisableTailCallsView->getNumOccurrences() > 0) 658 NewAttrs.addAttribute("disable-tail-calls", 659 toStringRef(getDisableTailCalls())); 660 if (getStackRealign()) 661 NewAttrs.addAttribute("stackrealign"); 662 663 HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math"); 664 HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math"); 665 HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math"); 666 HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math"); 667 HANDLE_BOOL_ATTR(EnableApproxFuncFPMathView, "approx-func-fp-math"); 668 669 if (DenormalFPMathView->getNumOccurrences() > 0 && 670 !F.hasFnAttribute("denormal-fp-math")) { 671 DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath(); 672 673 // FIXME: Command line flag should expose separate input/output modes. 674 NewAttrs.addAttribute("denormal-fp-math", 675 DenormalMode(DenormKind, DenormKind).str()); 676 } 677 678 if (DenormalFP32MathView->getNumOccurrences() > 0 && 679 !F.hasFnAttribute("denormal-fp-math-f32")) { 680 // FIXME: Command line flag should expose separate input/output modes. 681 DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math(); 682 683 NewAttrs.addAttribute( 684 "denormal-fp-math-f32", 685 DenormalMode(DenormKind, DenormKind).str()); 686 } 687 688 if (TrapFuncNameView->getNumOccurrences() > 0) 689 for (auto &B : F) 690 for (auto &I : B) 691 if (auto *Call = dyn_cast<CallInst>(&I)) 692 if (const auto *F = Call->getCalledFunction()) 693 if (F->getIntrinsicID() == Intrinsic::debugtrap || 694 F->getIntrinsicID() == Intrinsic::trap) 695 Call->addFnAttr( 696 Attribute::get(Ctx, "trap-func-name", getTrapFuncName())); 697 698 // Let NewAttrs override Attrs. 699 F.setAttributes(Attrs.addFnAttributes(Ctx, NewAttrs)); 700 } 701 702 /// Set function attributes of functions in Module M based on CPU, 703 /// Features, and command line flags. 704 void codegen::setFunctionAttributes(StringRef CPU, StringRef Features, 705 Module &M) { 706 for (Function &F : M) 707 setFunctionAttributes(CPU, Features, F); 708 } 709 710