ToolChain.h revision 360784
1//===- ToolChain.h - Collections of tools for one platform ------*- 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#ifndef LLVM_CLANG_DRIVER_TOOLCHAIN_H 10#define LLVM_CLANG_DRIVER_TOOLCHAIN_H 11 12#include "clang/Basic/DebugInfoOptions.h" 13#include "clang/Basic/LLVM.h" 14#include "clang/Basic/LangOptions.h" 15#include "clang/Basic/Sanitizers.h" 16#include "clang/Driver/Action.h" 17#include "clang/Driver/Multilib.h" 18#include "clang/Driver/Types.h" 19#include "llvm/ADT/ArrayRef.h" 20#include "llvm/ADT/SmallVector.h" 21#include "llvm/ADT/StringRef.h" 22#include "llvm/ADT/Triple.h" 23#include "llvm/MC/MCTargetOptions.h" 24#include "llvm/Option/Option.h" 25#include "llvm/Support/VersionTuple.h" 26#include "llvm/Target/TargetOptions.h" 27#include <cassert> 28#include <memory> 29#include <string> 30#include <utility> 31 32namespace llvm { 33namespace opt { 34 35class Arg; 36class ArgList; 37class DerivedArgList; 38 39} // namespace opt 40namespace vfs { 41 42class FileSystem; 43 44} // namespace vfs 45} // namespace llvm 46 47namespace clang { 48 49class ObjCRuntime; 50 51namespace driver { 52 53class Driver; 54class InputInfo; 55class SanitizerArgs; 56class Tool; 57class XRayArgs; 58 59/// Helper structure used to pass information extracted from clang executable 60/// name such as `i686-linux-android-g++`. 61struct ParsedClangName { 62 /// Target part of the executable name, as `i686-linux-android`. 63 std::string TargetPrefix; 64 65 /// Driver mode part of the executable name, as `g++`. 66 std::string ModeSuffix; 67 68 /// Corresponding driver mode argument, as '--driver-mode=g++' 69 const char *DriverMode = nullptr; 70 71 /// True if TargetPrefix is recognized as a registered target name. 72 bool TargetIsValid = false; 73 74 ParsedClangName() = default; 75 ParsedClangName(std::string Suffix, const char *Mode) 76 : ModeSuffix(Suffix), DriverMode(Mode) {} 77 ParsedClangName(std::string Target, std::string Suffix, const char *Mode, 78 bool IsRegistered) 79 : TargetPrefix(Target), ModeSuffix(Suffix), DriverMode(Mode), 80 TargetIsValid(IsRegistered) {} 81 82 bool isEmpty() const { 83 return TargetPrefix.empty() && ModeSuffix.empty() && DriverMode == nullptr; 84 } 85}; 86 87/// ToolChain - Access to tools for a single platform. 88class ToolChain { 89public: 90 using path_list = SmallVector<std::string, 16>; 91 92 enum CXXStdlibType { 93 CST_Libcxx, 94 CST_Libstdcxx 95 }; 96 97 enum RuntimeLibType { 98 RLT_CompilerRT, 99 RLT_Libgcc 100 }; 101 102 enum UnwindLibType { 103 UNW_None, 104 UNW_CompilerRT, 105 UNW_Libgcc 106 }; 107 108 enum RTTIMode { 109 RM_Enabled, 110 RM_Disabled, 111 }; 112 113 enum FileType { FT_Object, FT_Static, FT_Shared }; 114 115private: 116 friend class RegisterEffectiveTriple; 117 118 const Driver &D; 119 llvm::Triple Triple; 120 const llvm::opt::ArgList &Args; 121 122 // We need to initialize CachedRTTIArg before CachedRTTIMode 123 const llvm::opt::Arg *const CachedRTTIArg; 124 125 const RTTIMode CachedRTTIMode; 126 127 /// The list of toolchain specific path prefixes to search for libraries. 128 path_list LibraryPaths; 129 130 /// The list of toolchain specific path prefixes to search for files. 131 path_list FilePaths; 132 133 /// The list of toolchain specific path prefixes to search for programs. 134 path_list ProgramPaths; 135 136 mutable std::unique_ptr<Tool> Clang; 137 mutable std::unique_ptr<Tool> Flang; 138 mutable std::unique_ptr<Tool> Assemble; 139 mutable std::unique_ptr<Tool> Link; 140 mutable std::unique_ptr<Tool> IfsMerge; 141 mutable std::unique_ptr<Tool> OffloadBundler; 142 mutable std::unique_ptr<Tool> OffloadWrapper; 143 144 Tool *getClang() const; 145 Tool *getFlang() const; 146 Tool *getAssemble() const; 147 Tool *getLink() const; 148 Tool *getIfsMerge() const; 149 Tool *getClangAs() const; 150 Tool *getOffloadBundler() const; 151 Tool *getOffloadWrapper() const; 152 153 mutable std::unique_ptr<SanitizerArgs> SanitizerArguments; 154 mutable std::unique_ptr<XRayArgs> XRayArguments; 155 156 /// The effective clang triple for the current Job. 157 mutable llvm::Triple EffectiveTriple; 158 159 /// Set the toolchain's effective clang triple. 160 void setEffectiveTriple(llvm::Triple ET) const { 161 EffectiveTriple = std::move(ET); 162 } 163 164protected: 165 MultilibSet Multilibs; 166 Multilib SelectedMultilib; 167 168 ToolChain(const Driver &D, const llvm::Triple &T, 169 const llvm::opt::ArgList &Args); 170 171 void setTripleEnvironment(llvm::Triple::EnvironmentType Env); 172 173 virtual Tool *buildAssembler() const; 174 virtual Tool *buildLinker() const; 175 virtual Tool *getTool(Action::ActionClass AC) const; 176 177 /// \name Utilities for implementing subclasses. 178 ///@{ 179 static void addSystemInclude(const llvm::opt::ArgList &DriverArgs, 180 llvm::opt::ArgStringList &CC1Args, 181 const Twine &Path); 182 static void addExternCSystemInclude(const llvm::opt::ArgList &DriverArgs, 183 llvm::opt::ArgStringList &CC1Args, 184 const Twine &Path); 185 static void 186 addExternCSystemIncludeIfExists(const llvm::opt::ArgList &DriverArgs, 187 llvm::opt::ArgStringList &CC1Args, 188 const Twine &Path); 189 static void addSystemIncludes(const llvm::opt::ArgList &DriverArgs, 190 llvm::opt::ArgStringList &CC1Args, 191 ArrayRef<StringRef> Paths); 192 ///@} 193 194public: 195 virtual ~ToolChain(); 196 197 // Accessors 198 199 const Driver &getDriver() const { return D; } 200 llvm::vfs::FileSystem &getVFS() const; 201 const llvm::Triple &getTriple() const { return Triple; } 202 203 /// Get the toolchain's aux triple, if it has one. 204 /// 205 /// Exactly what the aux triple represents depends on the toolchain, but for 206 /// example when compiling CUDA code for the GPU, the triple might be NVPTX, 207 /// while the aux triple is the host (CPU) toolchain, e.g. x86-linux-gnu. 208 virtual const llvm::Triple *getAuxTriple() const { return nullptr; } 209 210 /// Some toolchains need to modify the file name, for example to replace the 211 /// extension for object files with .cubin for OpenMP offloading to Nvidia 212 /// GPUs. 213 virtual std::string getInputFilename(const InputInfo &Input) const; 214 215 llvm::Triple::ArchType getArch() const { return Triple.getArch(); } 216 StringRef getArchName() const { return Triple.getArchName(); } 217 StringRef getPlatform() const { return Triple.getVendorName(); } 218 StringRef getOS() const { return Triple.getOSName(); } 219 220 /// Provide the default architecture name (as expected by -arch) for 221 /// this toolchain. 222 StringRef getDefaultUniversalArchName() const; 223 224 std::string getTripleString() const { 225 return Triple.getTriple(); 226 } 227 228 /// Get the toolchain's effective clang triple. 229 const llvm::Triple &getEffectiveTriple() const { 230 assert(!EffectiveTriple.getTriple().empty() && "No effective triple"); 231 return EffectiveTriple; 232 } 233 234 path_list &getLibraryPaths() { return LibraryPaths; } 235 const path_list &getLibraryPaths() const { return LibraryPaths; } 236 237 path_list &getFilePaths() { return FilePaths; } 238 const path_list &getFilePaths() const { return FilePaths; } 239 240 path_list &getProgramPaths() { return ProgramPaths; } 241 const path_list &getProgramPaths() const { return ProgramPaths; } 242 243 const MultilibSet &getMultilibs() const { return Multilibs; } 244 245 const Multilib &getMultilib() const { return SelectedMultilib; } 246 247 const SanitizerArgs& getSanitizerArgs() const; 248 249 const XRayArgs& getXRayArgs() const; 250 251 // Returns the Arg * that explicitly turned on/off rtti, or nullptr. 252 const llvm::opt::Arg *getRTTIArg() const { return CachedRTTIArg; } 253 254 // Returns the RTTIMode for the toolchain with the current arguments. 255 RTTIMode getRTTIMode() const { return CachedRTTIMode; } 256 257 /// Return any implicit target and/or mode flag for an invocation of 258 /// the compiler driver as `ProgName`. 259 /// 260 /// For example, when called with i686-linux-android-g++, the first element 261 /// of the return value will be set to `"i686-linux-android"` and the second 262 /// will be set to "--driver-mode=g++"`. 263 /// It is OK if the target name is not registered. In this case the return 264 /// value contains false in the field TargetIsValid. 265 /// 266 /// \pre `llvm::InitializeAllTargets()` has been called. 267 /// \param ProgName The name the Clang driver was invoked with (from, 268 /// e.g., argv[0]). 269 /// \return A structure of type ParsedClangName that contains the executable 270 /// name parts. 271 static ParsedClangName getTargetAndModeFromProgramName(StringRef ProgName); 272 273 // Tool access. 274 275 /// TranslateArgs - Create a new derived argument list for any argument 276 /// translations this ToolChain may wish to perform, or 0 if no tool chain 277 /// specific translations are needed. If \p DeviceOffloadKind is specified 278 /// the translation specific for that offload kind is performed. 279 /// 280 /// \param BoundArch - The bound architecture name, or 0. 281 /// \param DeviceOffloadKind - The device offload kind used for the 282 /// translation. 283 virtual llvm::opt::DerivedArgList * 284 TranslateArgs(const llvm::opt::DerivedArgList &Args, StringRef BoundArch, 285 Action::OffloadKind DeviceOffloadKind) const { 286 return nullptr; 287 } 288 289 /// TranslateOpenMPTargetArgs - Create a new derived argument list for 290 /// that contains the OpenMP target specific flags passed via 291 /// -Xopenmp-target -opt=val OR -Xopenmp-target=<triple> -opt=val 292 virtual llvm::opt::DerivedArgList *TranslateOpenMPTargetArgs( 293 const llvm::opt::DerivedArgList &Args, bool SameTripleAsHost, 294 SmallVectorImpl<llvm::opt::Arg *> &AllocatedArgs) const; 295 296 /// Choose a tool to use to handle the action \p JA. 297 /// 298 /// This can be overridden when a particular ToolChain needs to use 299 /// a compiler other than Clang. 300 virtual Tool *SelectTool(const JobAction &JA) const; 301 302 // Helper methods 303 304 std::string GetFilePath(const char *Name) const; 305 std::string GetProgramPath(const char *Name) const; 306 307 /// Returns the linker path, respecting the -fuse-ld= argument to determine 308 /// the linker suffix or name. 309 std::string GetLinkerPath() const; 310 311 /// Dispatch to the specific toolchain for verbose printing. 312 /// 313 /// This is used when handling the verbose option to print detailed, 314 /// toolchain-specific information useful for understanding the behavior of 315 /// the driver on a specific platform. 316 virtual void printVerboseInfo(raw_ostream &OS) const {} 317 318 // Platform defaults information 319 320 /// Returns true if the toolchain is targeting a non-native 321 /// architecture. 322 virtual bool isCrossCompiling() const; 323 324 /// HasNativeLTOLinker - Check whether the linker and related tools have 325 /// native LLVM support. 326 virtual bool HasNativeLLVMSupport() const; 327 328 /// LookupTypeForExtension - Return the default language type to use for the 329 /// given extension. 330 virtual types::ID LookupTypeForExtension(StringRef Ext) const; 331 332 /// IsBlocksDefault - Does this tool chain enable -fblocks by default. 333 virtual bool IsBlocksDefault() const { return false; } 334 335 /// IsIntegratedAssemblerDefault - Does this tool chain enable -integrated-as 336 /// by default. 337 virtual bool IsIntegratedAssemblerDefault() const { return false; } 338 339 /// Check if the toolchain should use the integrated assembler. 340 virtual bool useIntegratedAs() const; 341 342 /// IsMathErrnoDefault - Does this tool chain use -fmath-errno by default. 343 virtual bool IsMathErrnoDefault() const { return true; } 344 345 /// IsEncodeExtendedBlockSignatureDefault - Does this tool chain enable 346 /// -fencode-extended-block-signature by default. 347 virtual bool IsEncodeExtendedBlockSignatureDefault() const { return false; } 348 349 /// IsObjCNonFragileABIDefault - Does this tool chain set 350 /// -fobjc-nonfragile-abi by default. 351 virtual bool IsObjCNonFragileABIDefault() const { return false; } 352 353 /// UseObjCMixedDispatchDefault - When using non-legacy dispatch, should the 354 /// mixed dispatch method be used? 355 virtual bool UseObjCMixedDispatch() const { return false; } 356 357 /// Check whether to enable x86 relax relocations by default. 358 virtual bool useRelaxRelocations() const; 359 360 /// GetDefaultStackProtectorLevel - Get the default stack protector level for 361 /// this tool chain (0=off, 1=on, 2=strong, 3=all). 362 virtual unsigned GetDefaultStackProtectorLevel(bool KernelOrKext) const { 363 return 0; 364 } 365 366 /// Get the default trivial automatic variable initialization. 367 virtual LangOptions::TrivialAutoVarInitKind 368 GetDefaultTrivialAutoVarInit() const { 369 return LangOptions::TrivialAutoVarInitKind::Uninitialized; 370 } 371 372 /// GetDefaultLinker - Get the default linker to use. 373 virtual const char *getDefaultLinker() const { return "ld"; } 374 375 /// GetDefaultRuntimeLibType - Get the default runtime library variant to use. 376 virtual RuntimeLibType GetDefaultRuntimeLibType() const { 377 return ToolChain::RLT_Libgcc; 378 } 379 380 virtual CXXStdlibType GetDefaultCXXStdlibType() const { 381 return ToolChain::CST_Libstdcxx; 382 } 383 384 virtual UnwindLibType GetDefaultUnwindLibType() const { 385 return ToolChain::UNW_None; 386 } 387 388 virtual std::string getCompilerRTPath() const; 389 390 virtual std::string getCompilerRT(const llvm::opt::ArgList &Args, 391 StringRef Component, 392 FileType Type = ToolChain::FT_Static) const; 393 394 const char * 395 getCompilerRTArgString(const llvm::opt::ArgList &Args, StringRef Component, 396 FileType Type = ToolChain::FT_Static) const; 397 398 // Returns target specific runtime path if it exists. 399 virtual Optional<std::string> getRuntimePath() const; 400 401 // Returns target specific C++ library path if it exists. 402 virtual Optional<std::string> getCXXStdlibPath() const; 403 404 // Returns <ResourceDir>/lib/<OSName>/<arch>. This is used by runtimes (such 405 // as OpenMP) to find arch-specific libraries. 406 std::string getArchSpecificLibPath() const; 407 408 // Returns <OSname> part of above. 409 StringRef getOSLibName() const; 410 411 /// needsProfileRT - returns true if instrumentation profile is on. 412 static bool needsProfileRT(const llvm::opt::ArgList &Args); 413 414 /// Returns true if gcov instrumentation (-fprofile-arcs or --coverage) is on. 415 static bool needsGCovInstrumentation(const llvm::opt::ArgList &Args); 416 417 /// IsUnwindTablesDefault - Does this tool chain use -funwind-tables 418 /// by default. 419 virtual bool IsUnwindTablesDefault(const llvm::opt::ArgList &Args) const; 420 421 /// Test whether this toolchain defaults to PIC. 422 virtual bool isPICDefault() const = 0; 423 424 /// Test whether this toolchain defaults to PIE. 425 virtual bool isPIEDefault() const = 0; 426 427 /// Test whether this toolchaind defaults to non-executable stacks. 428 virtual bool isNoExecStackDefault() const; 429 430 /// Tests whether this toolchain forces its default for PIC, PIE or 431 /// non-PIC. If this returns true, any PIC related flags should be ignored 432 /// and instead the results of \c isPICDefault() and \c isPIEDefault() are 433 /// used exclusively. 434 virtual bool isPICDefaultForced() const = 0; 435 436 /// SupportsProfiling - Does this tool chain support -pg. 437 virtual bool SupportsProfiling() const { return true; } 438 439 /// Complain if this tool chain doesn't support Objective-C ARC. 440 virtual void CheckObjCARC() const {} 441 442 /// Get the default debug info format. Typically, this is DWARF. 443 virtual codegenoptions::DebugInfoFormat getDefaultDebugFormat() const { 444 return codegenoptions::DIF_DWARF; 445 } 446 447 /// UseDwarfDebugFlags - Embed the compile options to clang into the Dwarf 448 /// compile unit information. 449 virtual bool UseDwarfDebugFlags() const { return false; } 450 451 // Return the DWARF version to emit, in the absence of arguments 452 // to the contrary. 453 virtual unsigned GetDefaultDwarfVersion() const { return 4; } 454 455 // True if the driver should assume "-fstandalone-debug" 456 // in the absence of an option specifying otherwise, 457 // provided that debugging was requested in the first place. 458 // i.e. a value of 'true' does not imply that debugging is wanted. 459 virtual bool GetDefaultStandaloneDebug() const { return false; } 460 461 // Return the default debugger "tuning." 462 virtual llvm::DebuggerKind getDefaultDebuggerTuning() const { 463 return llvm::DebuggerKind::GDB; 464 } 465 466 /// Does this toolchain supports given debug info option or not. 467 virtual bool supportsDebugInfoOption(const llvm::opt::Arg *) const { 468 return true; 469 } 470 471 /// Adjust debug information kind considering all passed options. 472 virtual void adjustDebugInfoKind(codegenoptions::DebugInfoKind &DebugInfoKind, 473 const llvm::opt::ArgList &Args) const {} 474 475 /// GetExceptionModel - Return the tool chain exception model. 476 virtual llvm::ExceptionHandling 477 GetExceptionModel(const llvm::opt::ArgList &Args) const; 478 479 /// SupportsEmbeddedBitcode - Does this tool chain support embedded bitcode. 480 virtual bool SupportsEmbeddedBitcode() const { return false; } 481 482 /// getThreadModel() - Which thread model does this target use? 483 virtual std::string getThreadModel() const { return "posix"; } 484 485 /// isThreadModelSupported() - Does this target support a thread model? 486 virtual bool isThreadModelSupported(const StringRef Model) const; 487 488 /// ComputeLLVMTriple - Return the LLVM target triple to use, after taking 489 /// command line arguments into account. 490 virtual std::string 491 ComputeLLVMTriple(const llvm::opt::ArgList &Args, 492 types::ID InputType = types::TY_INVALID) const; 493 494 /// ComputeEffectiveClangTriple - Return the Clang triple to use for this 495 /// target, which may take into account the command line arguments. For 496 /// example, on Darwin the -mmacosx-version-min= command line argument (which 497 /// sets the deployment target) determines the version in the triple passed to 498 /// Clang. 499 virtual std::string ComputeEffectiveClangTriple( 500 const llvm::opt::ArgList &Args, 501 types::ID InputType = types::TY_INVALID) const; 502 503 /// getDefaultObjCRuntime - Return the default Objective-C runtime 504 /// for this platform. 505 /// 506 /// FIXME: this really belongs on some sort of DeploymentTarget abstraction 507 virtual ObjCRuntime getDefaultObjCRuntime(bool isNonFragile) const; 508 509 /// hasBlocksRuntime - Given that the user is compiling with 510 /// -fblocks, does this tool chain guarantee the existence of a 511 /// blocks runtime? 512 /// 513 /// FIXME: this really belongs on some sort of DeploymentTarget abstraction 514 virtual bool hasBlocksRuntime() const { return true; } 515 516 /// Add the clang cc1 arguments for system include paths. 517 /// 518 /// This routine is responsible for adding the necessary cc1 arguments to 519 /// include headers from standard system header directories. 520 virtual void 521 AddClangSystemIncludeArgs(const llvm::opt::ArgList &DriverArgs, 522 llvm::opt::ArgStringList &CC1Args) const; 523 524 /// Add options that need to be passed to cc1 for this target. 525 virtual void addClangTargetOptions(const llvm::opt::ArgList &DriverArgs, 526 llvm::opt::ArgStringList &CC1Args, 527 Action::OffloadKind DeviceOffloadKind) const; 528 529 /// Add warning options that need to be passed to cc1 for this target. 530 virtual void addClangWarningOptions(llvm::opt::ArgStringList &CC1Args) const; 531 532 // GetRuntimeLibType - Determine the runtime library type to use with the 533 // given compilation arguments. 534 virtual RuntimeLibType 535 GetRuntimeLibType(const llvm::opt::ArgList &Args) const; 536 537 // GetCXXStdlibType - Determine the C++ standard library type to use with the 538 // given compilation arguments. 539 virtual CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const; 540 541 // GetUnwindLibType - Determine the unwind library type to use with the 542 // given compilation arguments. 543 virtual UnwindLibType GetUnwindLibType(const llvm::opt::ArgList &Args) const; 544 545 /// AddClangCXXStdlibIncludeArgs - Add the clang -cc1 level arguments to set 546 /// the include paths to use for the given C++ standard library type. 547 virtual void 548 AddClangCXXStdlibIncludeArgs(const llvm::opt::ArgList &DriverArgs, 549 llvm::opt::ArgStringList &CC1Args) const; 550 551 /// AddClangCXXStdlibIsystemArgs - Add the clang -cc1 level arguments to set 552 /// the specified include paths for the C++ standard library. 553 void AddClangCXXStdlibIsystemArgs(const llvm::opt::ArgList &DriverArgs, 554 llvm::opt::ArgStringList &CC1Args) const; 555 556 /// Returns if the C++ standard library should be linked in. 557 /// Note that e.g. -lm should still be linked even if this returns false. 558 bool ShouldLinkCXXStdlib(const llvm::opt::ArgList &Args) const; 559 560 /// AddCXXStdlibLibArgs - Add the system specific linker arguments to use 561 /// for the given C++ standard library type. 562 virtual void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args, 563 llvm::opt::ArgStringList &CmdArgs) const; 564 565 /// AddFilePathLibArgs - Add each thing in getFilePaths() as a "-L" option. 566 void AddFilePathLibArgs(const llvm::opt::ArgList &Args, 567 llvm::opt::ArgStringList &CmdArgs) const; 568 569 /// AddCCKextLibArgs - Add the system specific linker arguments to use 570 /// for kernel extensions (Darwin-specific). 571 virtual void AddCCKextLibArgs(const llvm::opt::ArgList &Args, 572 llvm::opt::ArgStringList &CmdArgs) const; 573 574 /// AddFastMathRuntimeIfAvailable - If a runtime library exists that sets 575 /// global flags for unsafe floating point math, add it and return true. 576 /// 577 /// This checks for presence of the -Ofast, -ffast-math or -funsafe-math flags. 578 virtual bool AddFastMathRuntimeIfAvailable( 579 const llvm::opt::ArgList &Args, llvm::opt::ArgStringList &CmdArgs) const; 580 581 /// addProfileRTLibs - When -fprofile-instr-profile is specified, try to pass 582 /// a suitable profile runtime library to the linker. 583 virtual void addProfileRTLibs(const llvm::opt::ArgList &Args, 584 llvm::opt::ArgStringList &CmdArgs) const; 585 586 /// Add arguments to use system-specific CUDA includes. 587 virtual void AddCudaIncludeArgs(const llvm::opt::ArgList &DriverArgs, 588 llvm::opt::ArgStringList &CC1Args) const; 589 590 /// Add arguments to use MCU GCC toolchain includes. 591 virtual void AddIAMCUIncludeArgs(const llvm::opt::ArgList &DriverArgs, 592 llvm::opt::ArgStringList &CC1Args) const; 593 594 /// On Windows, returns the MSVC compatibility version. 595 virtual VersionTuple computeMSVCVersion(const Driver *D, 596 const llvm::opt::ArgList &Args) const; 597 598 /// Return sanitizers which are available in this toolchain. 599 virtual SanitizerMask getSupportedSanitizers() const; 600 601 /// Return sanitizers which are enabled by default. 602 virtual SanitizerMask getDefaultSanitizers() const { 603 return SanitizerMask(); 604 } 605 606 /// Returns true when it's possible to split LTO unit to use whole 607 /// program devirtualization and CFI santiizers. 608 virtual bool canSplitThinLTOUnit() const { return true; } 609}; 610 611/// Set a ToolChain's effective triple. Reset it when the registration object 612/// is destroyed. 613class RegisterEffectiveTriple { 614 const ToolChain &TC; 615 616public: 617 RegisterEffectiveTriple(const ToolChain &TC, llvm::Triple T) : TC(TC) { 618 TC.setEffectiveTriple(std::move(T)); 619 } 620 621 ~RegisterEffectiveTriple() { TC.setEffectiveTriple(llvm::Triple()); } 622}; 623 624} // namespace driver 625 626} // namespace clang 627 628#endif // LLVM_CLANG_DRIVER_TOOLCHAIN_H 629