1//===- Module.cpp - Implement the Module class ----------------------------===// 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 implements the Module class for the IR library. 10// 11//===----------------------------------------------------------------------===// 12 13#include "llvm/IR/Module.h" 14#include "SymbolTableListTraitsImpl.h" 15#include "llvm/ADT/Optional.h" 16#include "llvm/ADT/SmallPtrSet.h" 17#include "llvm/ADT/SmallString.h" 18#include "llvm/ADT/SmallVector.h" 19#include "llvm/ADT/StringMap.h" 20#include "llvm/ADT/StringRef.h" 21#include "llvm/ADT/Twine.h" 22#include "llvm/IR/Attributes.h" 23#include "llvm/IR/Comdat.h" 24#include "llvm/IR/Constants.h" 25#include "llvm/IR/DataLayout.h" 26#include "llvm/IR/DebugInfoMetadata.h" 27#include "llvm/IR/DerivedTypes.h" 28#include "llvm/IR/Function.h" 29#include "llvm/IR/GVMaterializer.h" 30#include "llvm/IR/GlobalAlias.h" 31#include "llvm/IR/GlobalIFunc.h" 32#include "llvm/IR/GlobalValue.h" 33#include "llvm/IR/GlobalVariable.h" 34#include "llvm/IR/LLVMContext.h" 35#include "llvm/IR/Metadata.h" 36#include "llvm/IR/ModuleSummaryIndex.h" 37#include "llvm/IR/SymbolTableListTraits.h" 38#include "llvm/IR/Type.h" 39#include "llvm/IR/TypeFinder.h" 40#include "llvm/IR/Value.h" 41#include "llvm/IR/ValueSymbolTable.h" 42#include "llvm/Pass.h" 43#include "llvm/Support/Casting.h" 44#include "llvm/Support/CodeGen.h" 45#include "llvm/Support/Error.h" 46#include "llvm/Support/MemoryBuffer.h" 47#include "llvm/Support/Path.h" 48#include "llvm/Support/RandomNumberGenerator.h" 49#include "llvm/Support/VersionTuple.h" 50#include <algorithm> 51#include <cassert> 52#include <cstdint> 53#include <memory> 54#include <utility> 55#include <vector> 56 57using namespace llvm; 58 59//===----------------------------------------------------------------------===// 60// Methods to implement the globals and functions lists. 61// 62 63// Explicit instantiations of SymbolTableListTraits since some of the methods 64// are not in the public header file. 65template class llvm::SymbolTableListTraits<Function>; 66template class llvm::SymbolTableListTraits<GlobalVariable>; 67template class llvm::SymbolTableListTraits<GlobalAlias>; 68template class llvm::SymbolTableListTraits<GlobalIFunc>; 69 70//===----------------------------------------------------------------------===// 71// Primitive Module methods. 72// 73 74Module::Module(StringRef MID, LLVMContext &C) 75 : Context(C), ValSymTab(std::make_unique<ValueSymbolTable>()), 76 Materializer(), ModuleID(std::string(MID)), 77 SourceFileName(std::string(MID)), DL("") { 78 Context.addModule(this); 79} 80 81Module::~Module() { 82 Context.removeModule(this); 83 dropAllReferences(); 84 GlobalList.clear(); 85 FunctionList.clear(); 86 AliasList.clear(); 87 IFuncList.clear(); 88} 89 90std::unique_ptr<RandomNumberGenerator> 91Module::createRNG(const StringRef Name) const { 92 SmallString<32> Salt(Name); 93 94 // This RNG is guaranteed to produce the same random stream only 95 // when the Module ID and thus the input filename is the same. This 96 // might be problematic if the input filename extension changes 97 // (e.g. from .c to .bc or .ll). 98 // 99 // We could store this salt in NamedMetadata, but this would make 100 // the parameter non-const. This would unfortunately make this 101 // interface unusable by any Machine passes, since they only have a 102 // const reference to their IR Module. Alternatively we can always 103 // store salt metadata from the Module constructor. 104 Salt += sys::path::filename(getModuleIdentifier()); 105 106 return std::unique_ptr<RandomNumberGenerator>( 107 new RandomNumberGenerator(Salt)); 108} 109 110/// getNamedValue - Return the first global value in the module with 111/// the specified name, of arbitrary type. This method returns null 112/// if a global with the specified name is not found. 113GlobalValue *Module::getNamedValue(StringRef Name) const { 114 return cast_or_null<GlobalValue>(getValueSymbolTable().lookup(Name)); 115} 116 117/// getMDKindID - Return a unique non-zero ID for the specified metadata kind. 118/// This ID is uniqued across modules in the current LLVMContext. 119unsigned Module::getMDKindID(StringRef Name) const { 120 return Context.getMDKindID(Name); 121} 122 123/// getMDKindNames - Populate client supplied SmallVector with the name for 124/// custom metadata IDs registered in this LLVMContext. ID #0 is not used, 125/// so it is filled in as an empty string. 126void Module::getMDKindNames(SmallVectorImpl<StringRef> &Result) const { 127 return Context.getMDKindNames(Result); 128} 129 130void Module::getOperandBundleTags(SmallVectorImpl<StringRef> &Result) const { 131 return Context.getOperandBundleTags(Result); 132} 133 134//===----------------------------------------------------------------------===// 135// Methods for easy access to the functions in the module. 136// 137 138// getOrInsertFunction - Look up the specified function in the module symbol 139// table. If it does not exist, add a prototype for the function and return 140// it. This is nice because it allows most passes to get away with not handling 141// the symbol table directly for this common task. 142// 143FunctionCallee Module::getOrInsertFunction(StringRef Name, FunctionType *Ty, 144 AttributeList AttributeList) { 145 // See if we have a definition for the specified function already. 146 GlobalValue *F = getNamedValue(Name); 147 if (!F) { 148 // Nope, add it 149 Function *New = Function::Create(Ty, GlobalVariable::ExternalLinkage, 150 DL.getProgramAddressSpace(), Name); 151 if (!New->isIntrinsic()) // Intrinsics get attrs set on construction 152 New->setAttributes(AttributeList); 153 FunctionList.push_back(New); 154 return {Ty, New}; // Return the new prototype. 155 } 156 157 // If the function exists but has the wrong type, return a bitcast to the 158 // right type. 159 auto *PTy = PointerType::get(Ty, F->getAddressSpace()); 160 if (F->getType() != PTy) 161 return {Ty, ConstantExpr::getBitCast(F, PTy)}; 162 163 // Otherwise, we just found the existing function or a prototype. 164 return {Ty, F}; 165} 166 167FunctionCallee Module::getOrInsertFunction(StringRef Name, FunctionType *Ty) { 168 return getOrInsertFunction(Name, Ty, AttributeList()); 169} 170 171// getFunction - Look up the specified function in the module symbol table. 172// If it does not exist, return null. 173// 174Function *Module::getFunction(StringRef Name) const { 175 return dyn_cast_or_null<Function>(getNamedValue(Name)); 176} 177 178//===----------------------------------------------------------------------===// 179// Methods for easy access to the global variables in the module. 180// 181 182/// getGlobalVariable - Look up the specified global variable in the module 183/// symbol table. If it does not exist, return null. The type argument 184/// should be the underlying type of the global, i.e., it should not have 185/// the top-level PointerType, which represents the address of the global. 186/// If AllowLocal is set to true, this function will return types that 187/// have an local. By default, these types are not returned. 188/// 189GlobalVariable *Module::getGlobalVariable(StringRef Name, 190 bool AllowLocal) const { 191 if (GlobalVariable *Result = 192 dyn_cast_or_null<GlobalVariable>(getNamedValue(Name))) 193 if (AllowLocal || !Result->hasLocalLinkage()) 194 return Result; 195 return nullptr; 196} 197 198/// getOrInsertGlobal - Look up the specified global in the module symbol table. 199/// 1. If it does not exist, add a declaration of the global and return it. 200/// 2. Else, the global exists but has the wrong type: return the function 201/// with a constantexpr cast to the right type. 202/// 3. Finally, if the existing global is the correct declaration, return the 203/// existing global. 204Constant *Module::getOrInsertGlobal( 205 StringRef Name, Type *Ty, 206 function_ref<GlobalVariable *()> CreateGlobalCallback) { 207 // See if we have a definition for the specified global already. 208 GlobalVariable *GV = dyn_cast_or_null<GlobalVariable>(getNamedValue(Name)); 209 if (!GV) 210 GV = CreateGlobalCallback(); 211 assert(GV && "The CreateGlobalCallback is expected to create a global"); 212 213 // If the variable exists but has the wrong type, return a bitcast to the 214 // right type. 215 Type *GVTy = GV->getType(); 216 PointerType *PTy = PointerType::get(Ty, GVTy->getPointerAddressSpace()); 217 if (GVTy != PTy) 218 return ConstantExpr::getBitCast(GV, PTy); 219 220 // Otherwise, we just found the existing function or a prototype. 221 return GV; 222} 223 224// Overload to construct a global variable using its constructor's defaults. 225Constant *Module::getOrInsertGlobal(StringRef Name, Type *Ty) { 226 return getOrInsertGlobal(Name, Ty, [&] { 227 return new GlobalVariable(*this, Ty, false, GlobalVariable::ExternalLinkage, 228 nullptr, Name); 229 }); 230} 231 232//===----------------------------------------------------------------------===// 233// Methods for easy access to the global variables in the module. 234// 235 236// getNamedAlias - Look up the specified global in the module symbol table. 237// If it does not exist, return null. 238// 239GlobalAlias *Module::getNamedAlias(StringRef Name) const { 240 return dyn_cast_or_null<GlobalAlias>(getNamedValue(Name)); 241} 242 243GlobalIFunc *Module::getNamedIFunc(StringRef Name) const { 244 return dyn_cast_or_null<GlobalIFunc>(getNamedValue(Name)); 245} 246 247/// getNamedMetadata - Return the first NamedMDNode in the module with the 248/// specified name. This method returns null if a NamedMDNode with the 249/// specified name is not found. 250NamedMDNode *Module::getNamedMetadata(const Twine &Name) const { 251 SmallString<256> NameData; 252 StringRef NameRef = Name.toStringRef(NameData); 253 return NamedMDSymTab.lookup(NameRef); 254} 255 256/// getOrInsertNamedMetadata - Return the first named MDNode in the module 257/// with the specified name. This method returns a new NamedMDNode if a 258/// NamedMDNode with the specified name is not found. 259NamedMDNode *Module::getOrInsertNamedMetadata(StringRef Name) { 260 NamedMDNode *&NMD = NamedMDSymTab[Name]; 261 if (!NMD) { 262 NMD = new NamedMDNode(Name); 263 NMD->setParent(this); 264 NamedMDList.push_back(NMD); 265 } 266 return NMD; 267} 268 269/// eraseNamedMetadata - Remove the given NamedMDNode from this module and 270/// delete it. 271void Module::eraseNamedMetadata(NamedMDNode *NMD) { 272 NamedMDSymTab.erase(NMD->getName()); 273 NamedMDList.erase(NMD->getIterator()); 274} 275 276bool Module::isValidModFlagBehavior(Metadata *MD, ModFlagBehavior &MFB) { 277 if (ConstantInt *Behavior = mdconst::dyn_extract_or_null<ConstantInt>(MD)) { 278 uint64_t Val = Behavior->getLimitedValue(); 279 if (Val >= ModFlagBehaviorFirstVal && Val <= ModFlagBehaviorLastVal) { 280 MFB = static_cast<ModFlagBehavior>(Val); 281 return true; 282 } 283 } 284 return false; 285} 286 287bool Module::isValidModuleFlag(const MDNode &ModFlag, ModFlagBehavior &MFB, 288 MDString *&Key, Metadata *&Val) { 289 if (ModFlag.getNumOperands() < 3) 290 return false; 291 if (!isValidModFlagBehavior(ModFlag.getOperand(0), MFB)) 292 return false; 293 MDString *K = dyn_cast_or_null<MDString>(ModFlag.getOperand(1)); 294 if (!K) 295 return false; 296 Key = K; 297 Val = ModFlag.getOperand(2); 298 return true; 299} 300 301/// getModuleFlagsMetadata - Returns the module flags in the provided vector. 302void Module:: 303getModuleFlagsMetadata(SmallVectorImpl<ModuleFlagEntry> &Flags) const { 304 const NamedMDNode *ModFlags = getModuleFlagsMetadata(); 305 if (!ModFlags) return; 306 307 for (const MDNode *Flag : ModFlags->operands()) { 308 ModFlagBehavior MFB; 309 MDString *Key = nullptr; 310 Metadata *Val = nullptr; 311 if (isValidModuleFlag(*Flag, MFB, Key, Val)) { 312 // Check the operands of the MDNode before accessing the operands. 313 // The verifier will actually catch these failures. 314 Flags.push_back(ModuleFlagEntry(MFB, Key, Val)); 315 } 316 } 317} 318 319/// Return the corresponding value if Key appears in module flags, otherwise 320/// return null. 321Metadata *Module::getModuleFlag(StringRef Key) const { 322 SmallVector<Module::ModuleFlagEntry, 8> ModuleFlags; 323 getModuleFlagsMetadata(ModuleFlags); 324 for (const ModuleFlagEntry &MFE : ModuleFlags) { 325 if (Key == MFE.Key->getString()) 326 return MFE.Val; 327 } 328 return nullptr; 329} 330 331/// getModuleFlagsMetadata - Returns the NamedMDNode in the module that 332/// represents module-level flags. This method returns null if there are no 333/// module-level flags. 334NamedMDNode *Module::getModuleFlagsMetadata() const { 335 return getNamedMetadata("llvm.module.flags"); 336} 337 338/// getOrInsertModuleFlagsMetadata - Returns the NamedMDNode in the module that 339/// represents module-level flags. If module-level flags aren't found, it 340/// creates the named metadata that contains them. 341NamedMDNode *Module::getOrInsertModuleFlagsMetadata() { 342 return getOrInsertNamedMetadata("llvm.module.flags"); 343} 344 345/// addModuleFlag - Add a module-level flag to the module-level flags 346/// metadata. It will create the module-level flags named metadata if it doesn't 347/// already exist. 348void Module::addModuleFlag(ModFlagBehavior Behavior, StringRef Key, 349 Metadata *Val) { 350 Type *Int32Ty = Type::getInt32Ty(Context); 351 Metadata *Ops[3] = { 352 ConstantAsMetadata::get(ConstantInt::get(Int32Ty, Behavior)), 353 MDString::get(Context, Key), Val}; 354 getOrInsertModuleFlagsMetadata()->addOperand(MDNode::get(Context, Ops)); 355} 356void Module::addModuleFlag(ModFlagBehavior Behavior, StringRef Key, 357 Constant *Val) { 358 addModuleFlag(Behavior, Key, ConstantAsMetadata::get(Val)); 359} 360void Module::addModuleFlag(ModFlagBehavior Behavior, StringRef Key, 361 uint32_t Val) { 362 Type *Int32Ty = Type::getInt32Ty(Context); 363 addModuleFlag(Behavior, Key, ConstantInt::get(Int32Ty, Val)); 364} 365void Module::addModuleFlag(MDNode *Node) { 366 assert(Node->getNumOperands() == 3 && 367 "Invalid number of operands for module flag!"); 368 assert(mdconst::hasa<ConstantInt>(Node->getOperand(0)) && 369 isa<MDString>(Node->getOperand(1)) && 370 "Invalid operand types for module flag!"); 371 getOrInsertModuleFlagsMetadata()->addOperand(Node); 372} 373 374void Module::setModuleFlag(ModFlagBehavior Behavior, StringRef Key, 375 Metadata *Val) { 376 NamedMDNode *ModFlags = getOrInsertModuleFlagsMetadata(); 377 // Replace the flag if it already exists. 378 for (unsigned I = 0, E = ModFlags->getNumOperands(); I != E; ++I) { 379 MDNode *Flag = ModFlags->getOperand(I); 380 ModFlagBehavior MFB; 381 MDString *K = nullptr; 382 Metadata *V = nullptr; 383 if (isValidModuleFlag(*Flag, MFB, K, V) && K->getString() == Key) { 384 Flag->replaceOperandWith(2, Val); 385 return; 386 } 387 } 388 addModuleFlag(Behavior, Key, Val); 389} 390 391void Module::setDataLayout(StringRef Desc) { 392 DL.reset(Desc); 393} 394 395void Module::setDataLayout(const DataLayout &Other) { DL = Other; } 396 397const DataLayout &Module::getDataLayout() const { return DL; } 398 399DICompileUnit *Module::debug_compile_units_iterator::operator*() const { 400 return cast<DICompileUnit>(CUs->getOperand(Idx)); 401} 402DICompileUnit *Module::debug_compile_units_iterator::operator->() const { 403 return cast<DICompileUnit>(CUs->getOperand(Idx)); 404} 405 406void Module::debug_compile_units_iterator::SkipNoDebugCUs() { 407 while (CUs && (Idx < CUs->getNumOperands()) && 408 ((*this)->getEmissionKind() == DICompileUnit::NoDebug)) 409 ++Idx; 410} 411 412iterator_range<Module::global_object_iterator> Module::global_objects() { 413 return concat<GlobalObject>(functions(), globals()); 414} 415iterator_range<Module::const_global_object_iterator> 416Module::global_objects() const { 417 return concat<const GlobalObject>(functions(), globals()); 418} 419 420iterator_range<Module::global_value_iterator> Module::global_values() { 421 return concat<GlobalValue>(functions(), globals(), aliases(), ifuncs()); 422} 423iterator_range<Module::const_global_value_iterator> 424Module::global_values() const { 425 return concat<const GlobalValue>(functions(), globals(), aliases(), ifuncs()); 426} 427 428//===----------------------------------------------------------------------===// 429// Methods to control the materialization of GlobalValues in the Module. 430// 431void Module::setMaterializer(GVMaterializer *GVM) { 432 assert(!Materializer && 433 "Module already has a GVMaterializer. Call materializeAll" 434 " to clear it out before setting another one."); 435 Materializer.reset(GVM); 436} 437 438Error Module::materialize(GlobalValue *GV) { 439 if (!Materializer) 440 return Error::success(); 441 442 return Materializer->materialize(GV); 443} 444 445Error Module::materializeAll() { 446 if (!Materializer) 447 return Error::success(); 448 std::unique_ptr<GVMaterializer> M = std::move(Materializer); 449 return M->materializeModule(); 450} 451 452Error Module::materializeMetadata() { 453 if (!Materializer) 454 return Error::success(); 455 return Materializer->materializeMetadata(); 456} 457 458//===----------------------------------------------------------------------===// 459// Other module related stuff. 460// 461 462std::vector<StructType *> Module::getIdentifiedStructTypes() const { 463 // If we have a materializer, it is possible that some unread function 464 // uses a type that is currently not visible to a TypeFinder, so ask 465 // the materializer which types it created. 466 if (Materializer) 467 return Materializer->getIdentifiedStructTypes(); 468 469 std::vector<StructType *> Ret; 470 TypeFinder SrcStructTypes; 471 SrcStructTypes.run(*this, true); 472 Ret.assign(SrcStructTypes.begin(), SrcStructTypes.end()); 473 return Ret; 474} 475 476// dropAllReferences() - This function causes all the subelements to "let go" 477// of all references that they are maintaining. This allows one to 'delete' a 478// whole module at a time, even though there may be circular references... first 479// all references are dropped, and all use counts go to zero. Then everything 480// is deleted for real. Note that no operations are valid on an object that 481// has "dropped all references", except operator delete. 482// 483void Module::dropAllReferences() { 484 for (Function &F : *this) 485 F.dropAllReferences(); 486 487 for (GlobalVariable &GV : globals()) 488 GV.dropAllReferences(); 489 490 for (GlobalAlias &GA : aliases()) 491 GA.dropAllReferences(); 492 493 for (GlobalIFunc &GIF : ifuncs()) 494 GIF.dropAllReferences(); 495} 496 497unsigned Module::getNumberRegisterParameters() const { 498 auto *Val = 499 cast_or_null<ConstantAsMetadata>(getModuleFlag("NumRegisterParameters")); 500 if (!Val) 501 return 0; 502 return cast<ConstantInt>(Val->getValue())->getZExtValue(); 503} 504 505unsigned Module::getDwarfVersion() const { 506 auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("Dwarf Version")); 507 if (!Val) 508 return 0; 509 return cast<ConstantInt>(Val->getValue())->getZExtValue(); 510} 511 512unsigned Module::getCodeViewFlag() const { 513 auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("CodeView")); 514 if (!Val) 515 return 0; 516 return cast<ConstantInt>(Val->getValue())->getZExtValue(); 517} 518 519unsigned Module::getInstructionCount() { 520 unsigned NumInstrs = 0; 521 for (Function &F : FunctionList) 522 NumInstrs += F.getInstructionCount(); 523 return NumInstrs; 524} 525 526Comdat *Module::getOrInsertComdat(StringRef Name) { 527 auto &Entry = *ComdatSymTab.insert(std::make_pair(Name, Comdat())).first; 528 Entry.second.Name = &Entry; 529 return &Entry.second; 530} 531 532PICLevel::Level Module::getPICLevel() const { 533 auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("PIC Level")); 534 535 if (!Val) 536 return PICLevel::NotPIC; 537 538 return static_cast<PICLevel::Level>( 539 cast<ConstantInt>(Val->getValue())->getZExtValue()); 540} 541 542void Module::setPICLevel(PICLevel::Level PL) { 543 addModuleFlag(ModFlagBehavior::Max, "PIC Level", PL); 544} 545 546PIELevel::Level Module::getPIELevel() const { 547 auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("PIE Level")); 548 549 if (!Val) 550 return PIELevel::Default; 551 552 return static_cast<PIELevel::Level>( 553 cast<ConstantInt>(Val->getValue())->getZExtValue()); 554} 555 556void Module::setPIELevel(PIELevel::Level PL) { 557 addModuleFlag(ModFlagBehavior::Max, "PIE Level", PL); 558} 559 560Optional<CodeModel::Model> Module::getCodeModel() const { 561 auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("Code Model")); 562 563 if (!Val) 564 return None; 565 566 return static_cast<CodeModel::Model>( 567 cast<ConstantInt>(Val->getValue())->getZExtValue()); 568} 569 570void Module::setCodeModel(CodeModel::Model CL) { 571 // Linking object files with different code models is undefined behavior 572 // because the compiler would have to generate additional code (to span 573 // longer jumps) if a larger code model is used with a smaller one. 574 // Therefore we will treat attempts to mix code models as an error. 575 addModuleFlag(ModFlagBehavior::Error, "Code Model", CL); 576} 577 578void Module::setProfileSummary(Metadata *M, ProfileSummary::Kind Kind) { 579 if (Kind == ProfileSummary::PSK_CSInstr) 580 setModuleFlag(ModFlagBehavior::Error, "CSProfileSummary", M); 581 else 582 setModuleFlag(ModFlagBehavior::Error, "ProfileSummary", M); 583} 584 585Metadata *Module::getProfileSummary(bool IsCS) { 586 return (IsCS ? getModuleFlag("CSProfileSummary") 587 : getModuleFlag("ProfileSummary")); 588} 589 590bool Module::getSemanticInterposition() const { 591 Metadata *MF = getModuleFlag("SemanticInterposition"); 592 593 auto *Val = cast_or_null<ConstantAsMetadata>(MF); 594 if (!Val) 595 return false; 596 597 return cast<ConstantInt>(Val->getValue())->getZExtValue(); 598} 599 600void Module::setSemanticInterposition(bool SI) { 601 addModuleFlag(ModFlagBehavior::Error, "SemanticInterposition", SI); 602} 603 604bool Module::noSemanticInterposition() const { 605 // Conservatively require an explicit zero value for now. 606 Metadata *MF = getModuleFlag("SemanticInterposition"); 607 auto *Val = cast_or_null<ConstantAsMetadata>(MF); 608 return Val && cast<ConstantInt>(Val->getValue())->getZExtValue() == 0; 609} 610 611void Module::setOwnedMemoryBuffer(std::unique_ptr<MemoryBuffer> MB) { 612 OwnedMemoryBuffer = std::move(MB); 613} 614 615bool Module::getRtLibUseGOT() const { 616 auto *Val = cast_or_null<ConstantAsMetadata>(getModuleFlag("RtLibUseGOT")); 617 return Val && (cast<ConstantInt>(Val->getValue())->getZExtValue() > 0); 618} 619 620void Module::setRtLibUseGOT() { 621 addModuleFlag(ModFlagBehavior::Max, "RtLibUseGOT", 1); 622} 623 624void Module::setSDKVersion(const VersionTuple &V) { 625 SmallVector<unsigned, 3> Entries; 626 Entries.push_back(V.getMajor()); 627 if (auto Minor = V.getMinor()) { 628 Entries.push_back(*Minor); 629 if (auto Subminor = V.getSubminor()) 630 Entries.push_back(*Subminor); 631 // Ignore the 'build' component as it can't be represented in the object 632 // file. 633 } 634 addModuleFlag(ModFlagBehavior::Warning, "SDK Version", 635 ConstantDataArray::get(Context, Entries)); 636} 637 638VersionTuple Module::getSDKVersion() const { 639 auto *CM = dyn_cast_or_null<ConstantAsMetadata>(getModuleFlag("SDK Version")); 640 if (!CM) 641 return {}; 642 auto *Arr = dyn_cast_or_null<ConstantDataArray>(CM->getValue()); 643 if (!Arr) 644 return {}; 645 auto getVersionComponent = [&](unsigned Index) -> Optional<unsigned> { 646 if (Index >= Arr->getNumElements()) 647 return None; 648 return (unsigned)Arr->getElementAsInteger(Index); 649 }; 650 auto Major = getVersionComponent(0); 651 if (!Major) 652 return {}; 653 VersionTuple Result = VersionTuple(*Major); 654 if (auto Minor = getVersionComponent(1)) { 655 Result = VersionTuple(*Major, *Minor); 656 if (auto Subminor = getVersionComponent(2)) { 657 Result = VersionTuple(*Major, *Minor, *Subminor); 658 } 659 } 660 return Result; 661} 662 663GlobalVariable *llvm::collectUsedGlobalVariables( 664 const Module &M, SmallPtrSetImpl<GlobalValue *> &Set, bool CompilerUsed) { 665 const char *Name = CompilerUsed ? "llvm.compiler.used" : "llvm.used"; 666 GlobalVariable *GV = M.getGlobalVariable(Name); 667 if (!GV || !GV->hasInitializer()) 668 return GV; 669 670 const ConstantArray *Init = cast<ConstantArray>(GV->getInitializer()); 671 for (Value *Op : Init->operands()) { 672 GlobalValue *G = cast<GlobalValue>(Op->stripPointerCasts()); 673 Set.insert(G); 674 } 675 return GV; 676} 677 678void Module::setPartialSampleProfileRatio(const ModuleSummaryIndex &Index) { 679 if (auto *SummaryMD = getProfileSummary(/*IsCS*/ false)) { 680 std::unique_ptr<ProfileSummary> ProfileSummary( 681 ProfileSummary::getFromMD(SummaryMD)); 682 if (ProfileSummary) { 683 if (ProfileSummary->getKind() != ProfileSummary::PSK_Sample || 684 !ProfileSummary->isPartialProfile()) 685 return; 686 uint64_t BlockCount = Index.getBlockCount(); 687 uint32_t NumCounts = ProfileSummary->getNumCounts(); 688 if (!NumCounts) 689 return; 690 double Ratio = (double)BlockCount / NumCounts; 691 ProfileSummary->setPartialProfileRatio(Ratio); 692 setProfileSummary(ProfileSummary->getMD(getContext()), 693 ProfileSummary::PSK_Sample); 694 } 695 } 696} 697