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