1 //===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/CodeGen/MachineModuleInfo.h" 11 #include "llvm/ADT/PointerUnion.h" 12 #include "llvm/Analysis/ValueTracking.h" 13 #include "llvm/CodeGen/MachineFunction.h" 14 #include "llvm/CodeGen/MachineFunctionPass.h" 15 #include "llvm/CodeGen/Passes.h" 16 #include "llvm/IR/Constants.h" 17 #include "llvm/IR/DerivedTypes.h" 18 #include "llvm/IR/GlobalVariable.h" 19 #include "llvm/IR/Module.h" 20 #include "llvm/MC/MCObjectFileInfo.h" 21 #include "llvm/MC/MCSymbol.h" 22 #include "llvm/Support/Dwarf.h" 23 #include "llvm/Support/ErrorHandling.h" 24 using namespace llvm; 25 using namespace llvm::dwarf; 26 27 // Handle the Pass registration stuff necessary to use DataLayout's. 28 INITIALIZE_PASS(MachineModuleInfo, "machinemoduleinfo", 29 "Machine Module Information", false, false) 30 char MachineModuleInfo::ID = 0; 31 32 // Out of line virtual method. 33 MachineModuleInfoImpl::~MachineModuleInfoImpl() {} 34 35 namespace llvm { 36 class MMIAddrLabelMapCallbackPtr : CallbackVH { 37 MMIAddrLabelMap *Map; 38 public: 39 MMIAddrLabelMapCallbackPtr() : Map(0) {} 40 MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V), Map(0) {} 41 42 void setPtr(BasicBlock *BB) { 43 ValueHandleBase::operator=(BB); 44 } 45 46 void setMap(MMIAddrLabelMap *map) { Map = map; } 47 48 virtual void deleted(); 49 virtual void allUsesReplacedWith(Value *V2); 50 }; 51 52 class MMIAddrLabelMap { 53 MCContext &Context; 54 struct AddrLabelSymEntry { 55 /// Symbols - The symbols for the label. This is a pointer union that is 56 /// either one symbol (the common case) or a list of symbols. 57 PointerUnion<MCSymbol *, std::vector<MCSymbol*>*> Symbols; 58 59 Function *Fn; // The containing function of the BasicBlock. 60 unsigned Index; // The index in BBCallbacks for the BasicBlock. 61 }; 62 63 DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry> AddrLabelSymbols; 64 65 /// BBCallbacks - Callbacks for the BasicBlock's that we have entries for. We 66 /// use this so we get notified if a block is deleted or RAUWd. 67 std::vector<MMIAddrLabelMapCallbackPtr> BBCallbacks; 68 69 /// DeletedAddrLabelsNeedingEmission - This is a per-function list of symbols 70 /// whose corresponding BasicBlock got deleted. These symbols need to be 71 /// emitted at some point in the file, so AsmPrinter emits them after the 72 /// function body. 73 DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> > 74 DeletedAddrLabelsNeedingEmission; 75 public: 76 77 MMIAddrLabelMap(MCContext &context) : Context(context) {} 78 ~MMIAddrLabelMap() { 79 assert(DeletedAddrLabelsNeedingEmission.empty() && 80 "Some labels for deleted blocks never got emitted"); 81 82 // Deallocate any of the 'list of symbols' case. 83 for (DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry>::iterator 84 I = AddrLabelSymbols.begin(), E = AddrLabelSymbols.end(); I != E; ++I) 85 if (I->second.Symbols.is<std::vector<MCSymbol*>*>()) 86 delete I->second.Symbols.get<std::vector<MCSymbol*>*>(); 87 } 88 89 MCSymbol *getAddrLabelSymbol(BasicBlock *BB); 90 std::vector<MCSymbol*> getAddrLabelSymbolToEmit(BasicBlock *BB); 91 92 void takeDeletedSymbolsForFunction(Function *F, 93 std::vector<MCSymbol*> &Result); 94 95 void UpdateForDeletedBlock(BasicBlock *BB); 96 void UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New); 97 }; 98 } 99 100 MCSymbol *MMIAddrLabelMap::getAddrLabelSymbol(BasicBlock *BB) { 101 assert(BB->hasAddressTaken() && 102 "Shouldn't get label for block without address taken"); 103 AddrLabelSymEntry &Entry = AddrLabelSymbols[BB]; 104 105 // If we already had an entry for this block, just return it. 106 if (!Entry.Symbols.isNull()) { 107 assert(BB->getParent() == Entry.Fn && "Parent changed"); 108 if (Entry.Symbols.is<MCSymbol*>()) 109 return Entry.Symbols.get<MCSymbol*>(); 110 return (*Entry.Symbols.get<std::vector<MCSymbol*>*>())[0]; 111 } 112 113 // Otherwise, this is a new entry, create a new symbol for it and add an 114 // entry to BBCallbacks so we can be notified if the BB is deleted or RAUWd. 115 BBCallbacks.push_back(BB); 116 BBCallbacks.back().setMap(this); 117 Entry.Index = BBCallbacks.size()-1; 118 Entry.Fn = BB->getParent(); 119 MCSymbol *Result = Context.CreateTempSymbol(); 120 Entry.Symbols = Result; 121 return Result; 122 } 123 124 std::vector<MCSymbol*> 125 MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) { 126 assert(BB->hasAddressTaken() && 127 "Shouldn't get label for block without address taken"); 128 AddrLabelSymEntry &Entry = AddrLabelSymbols[BB]; 129 130 std::vector<MCSymbol*> Result; 131 132 // If we already had an entry for this block, just return it. 133 if (Entry.Symbols.isNull()) 134 Result.push_back(getAddrLabelSymbol(BB)); 135 else if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>()) 136 Result.push_back(Sym); 137 else 138 Result = *Entry.Symbols.get<std::vector<MCSymbol*>*>(); 139 return Result; 140 } 141 142 143 /// takeDeletedSymbolsForFunction - If we have any deleted symbols for F, return 144 /// them. 145 void MMIAddrLabelMap:: 146 takeDeletedSymbolsForFunction(Function *F, std::vector<MCSymbol*> &Result) { 147 DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >::iterator I = 148 DeletedAddrLabelsNeedingEmission.find(F); 149 150 // If there are no entries for the function, just return. 151 if (I == DeletedAddrLabelsNeedingEmission.end()) return; 152 153 // Otherwise, take the list. 154 std::swap(Result, I->second); 155 DeletedAddrLabelsNeedingEmission.erase(I); 156 } 157 158 159 void MMIAddrLabelMap::UpdateForDeletedBlock(BasicBlock *BB) { 160 // If the block got deleted, there is no need for the symbol. If the symbol 161 // was already emitted, we can just forget about it, otherwise we need to 162 // queue it up for later emission when the function is output. 163 AddrLabelSymEntry Entry = AddrLabelSymbols[BB]; 164 AddrLabelSymbols.erase(BB); 165 assert(!Entry.Symbols.isNull() && "Didn't have a symbol, why a callback?"); 166 BBCallbacks[Entry.Index] = 0; // Clear the callback. 167 168 assert((BB->getParent() == 0 || BB->getParent() == Entry.Fn) && 169 "Block/parent mismatch"); 170 171 // Handle both the single and the multiple symbols cases. 172 if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>()) { 173 if (Sym->isDefined()) 174 return; 175 176 // If the block is not yet defined, we need to emit it at the end of the 177 // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list 178 // for the containing Function. Since the block is being deleted, its 179 // parent may already be removed, we have to get the function from 'Entry'. 180 DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym); 181 } else { 182 std::vector<MCSymbol*> *Syms = Entry.Symbols.get<std::vector<MCSymbol*>*>(); 183 184 for (unsigned i = 0, e = Syms->size(); i != e; ++i) { 185 MCSymbol *Sym = (*Syms)[i]; 186 if (Sym->isDefined()) continue; // Ignore already emitted labels. 187 188 // If the block is not yet defined, we need to emit it at the end of the 189 // function. Add the symbol to the DeletedAddrLabelsNeedingEmission list 190 // for the containing Function. Since the block is being deleted, its 191 // parent may already be removed, we have to get the function from 192 // 'Entry'. 193 DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym); 194 } 195 196 // The entry is deleted, free the memory associated with the symbol list. 197 delete Syms; 198 } 199 } 200 201 void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) { 202 // Get the entry for the RAUW'd block and remove it from our map. 203 AddrLabelSymEntry OldEntry = AddrLabelSymbols[Old]; 204 AddrLabelSymbols.erase(Old); 205 assert(!OldEntry.Symbols.isNull() && "Didn't have a symbol, why a callback?"); 206 207 AddrLabelSymEntry &NewEntry = AddrLabelSymbols[New]; 208 209 // If New is not address taken, just move our symbol over to it. 210 if (NewEntry.Symbols.isNull()) { 211 BBCallbacks[OldEntry.Index].setPtr(New); // Update the callback. 212 NewEntry = OldEntry; // Set New's entry. 213 return; 214 } 215 216 BBCallbacks[OldEntry.Index] = 0; // Update the callback. 217 218 // Otherwise, we need to add the old symbol to the new block's set. If it is 219 // just a single entry, upgrade it to a symbol list. 220 if (MCSymbol *PrevSym = NewEntry.Symbols.dyn_cast<MCSymbol*>()) { 221 std::vector<MCSymbol*> *SymList = new std::vector<MCSymbol*>(); 222 SymList->push_back(PrevSym); 223 NewEntry.Symbols = SymList; 224 } 225 226 std::vector<MCSymbol*> *SymList = 227 NewEntry.Symbols.get<std::vector<MCSymbol*>*>(); 228 229 // If the old entry was a single symbol, add it. 230 if (MCSymbol *Sym = OldEntry.Symbols.dyn_cast<MCSymbol*>()) { 231 SymList->push_back(Sym); 232 return; 233 } 234 235 // Otherwise, concatenate the list. 236 std::vector<MCSymbol*> *Syms =OldEntry.Symbols.get<std::vector<MCSymbol*>*>(); 237 SymList->insert(SymList->end(), Syms->begin(), Syms->end()); 238 delete Syms; 239 } 240 241 242 void MMIAddrLabelMapCallbackPtr::deleted() { 243 Map->UpdateForDeletedBlock(cast<BasicBlock>(getValPtr())); 244 } 245 246 void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) { 247 Map->UpdateForRAUWBlock(cast<BasicBlock>(getValPtr()), cast<BasicBlock>(V2)); 248 } 249 250 251 //===----------------------------------------------------------------------===// 252 253 MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI, 254 const MCRegisterInfo &MRI, 255 const MCObjectFileInfo *MOFI) 256 : ImmutablePass(ID), Context(MAI, MRI, MOFI, 0, false) { 257 initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry()); 258 } 259 260 MachineModuleInfo::MachineModuleInfo() 261 : ImmutablePass(ID), 262 Context(*(MCAsmInfo*)0, *(MCRegisterInfo*)0, (MCObjectFileInfo*)0) { 263 llvm_unreachable("This MachineModuleInfo constructor should never be called, " 264 "MMI should always be explicitly constructed by " 265 "LLVMTargetMachine"); 266 } 267 268 MachineModuleInfo::~MachineModuleInfo() { 269 } 270 271 bool MachineModuleInfo::doInitialization(Module &M) { 272 273 ObjFileMMI = 0; 274 CompactUnwindEncoding = 0; 275 CurCallSite = 0; 276 CallsEHReturn = 0; 277 CallsUnwindInit = 0; 278 DbgInfoAvailable = UsesVAFloatArgument = false; 279 // Always emit some info, by default "no personality" info. 280 Personalities.push_back(NULL); 281 AddrLabelSymbols = 0; 282 TheModule = 0; 283 284 return false; 285 } 286 287 bool MachineModuleInfo::doFinalization(Module &M) { 288 289 Personalities.clear(); 290 291 delete AddrLabelSymbols; 292 AddrLabelSymbols = 0; 293 294 Context.reset(); 295 296 delete ObjFileMMI; 297 ObjFileMMI = 0; 298 299 return false; 300 } 301 302 /// EndFunction - Discard function meta information. 303 /// 304 void MachineModuleInfo::EndFunction() { 305 // Clean up frame info. 306 FrameMoves.clear(); 307 308 // Clean up exception info. 309 LandingPads.clear(); 310 CallSiteMap.clear(); 311 TypeInfos.clear(); 312 FilterIds.clear(); 313 FilterEnds.clear(); 314 CallsEHReturn = 0; 315 CallsUnwindInit = 0; 316 CompactUnwindEncoding = 0; 317 VariableDbgInfo.clear(); 318 } 319 320 /// AnalyzeModule - Scan the module for global debug information. 321 /// 322 void MachineModuleInfo::AnalyzeModule(const Module &M) { 323 // Insert functions in the llvm.used array (but not llvm.compiler.used) into 324 // UsedFunctions. 325 const GlobalVariable *GV = M.getGlobalVariable("llvm.used"); 326 if (!GV || !GV->hasInitializer()) return; 327 328 // Should be an array of 'i8*'. 329 const ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer()); 330 if (InitList == 0) return; 331 332 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 333 if (const Function *F = 334 dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts())) 335 UsedFunctions.insert(F); 336 } 337 338 //===- Address of Block Management ----------------------------------------===// 339 340 341 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic 342 /// block when its address is taken. This cannot be its normal LBB label 343 /// because the block may be accessed outside its containing function. 344 MCSymbol *MachineModuleInfo::getAddrLabelSymbol(const BasicBlock *BB) { 345 // Lazily create AddrLabelSymbols. 346 if (AddrLabelSymbols == 0) 347 AddrLabelSymbols = new MMIAddrLabelMap(Context); 348 return AddrLabelSymbols->getAddrLabelSymbol(const_cast<BasicBlock*>(BB)); 349 } 350 351 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified 352 /// basic block when its address is taken. If other blocks were RAUW'd to 353 /// this one, we may have to emit them as well, return the whole set. 354 std::vector<MCSymbol*> MachineModuleInfo:: 355 getAddrLabelSymbolToEmit(const BasicBlock *BB) { 356 // Lazily create AddrLabelSymbols. 357 if (AddrLabelSymbols == 0) 358 AddrLabelSymbols = new MMIAddrLabelMap(Context); 359 return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB)); 360 } 361 362 363 /// takeDeletedSymbolsForFunction - If the specified function has had any 364 /// references to address-taken blocks generated, but the block got deleted, 365 /// return the symbol now so we can emit it. This prevents emitting a 366 /// reference to a symbol that has no definition. 367 void MachineModuleInfo:: 368 takeDeletedSymbolsForFunction(const Function *F, 369 std::vector<MCSymbol*> &Result) { 370 // If no blocks have had their addresses taken, we're done. 371 if (AddrLabelSymbols == 0) return; 372 return AddrLabelSymbols-> 373 takeDeletedSymbolsForFunction(const_cast<Function*>(F), Result); 374 } 375 376 //===- EH -----------------------------------------------------------------===// 377 378 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the 379 /// specified MachineBasicBlock. 380 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo 381 (MachineBasicBlock *LandingPad) { 382 unsigned N = LandingPads.size(); 383 for (unsigned i = 0; i < N; ++i) { 384 LandingPadInfo &LP = LandingPads[i]; 385 if (LP.LandingPadBlock == LandingPad) 386 return LP; 387 } 388 389 LandingPads.push_back(LandingPadInfo(LandingPad)); 390 return LandingPads[N]; 391 } 392 393 /// addInvoke - Provide the begin and end labels of an invoke style call and 394 /// associate it with a try landing pad block. 395 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad, 396 MCSymbol *BeginLabel, MCSymbol *EndLabel) { 397 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 398 LP.BeginLabels.push_back(BeginLabel); 399 LP.EndLabels.push_back(EndLabel); 400 } 401 402 /// addLandingPad - Provide the label of a try LandingPad block. 403 /// 404 MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) { 405 MCSymbol *LandingPadLabel = Context.CreateTempSymbol(); 406 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 407 LP.LandingPadLabel = LandingPadLabel; 408 return LandingPadLabel; 409 } 410 411 /// addPersonality - Provide the personality function for the exception 412 /// information. 413 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad, 414 const Function *Personality) { 415 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 416 LP.Personality = Personality; 417 418 for (unsigned i = 0; i < Personalities.size(); ++i) 419 if (Personalities[i] == Personality) 420 return; 421 422 // If this is the first personality we're adding go 423 // ahead and add it at the beginning. 424 if (Personalities[0] == NULL) 425 Personalities[0] = Personality; 426 else 427 Personalities.push_back(Personality); 428 } 429 430 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad. 431 /// 432 void MachineModuleInfo:: 433 addCatchTypeInfo(MachineBasicBlock *LandingPad, 434 ArrayRef<const GlobalVariable *> TyInfo) { 435 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 436 for (unsigned N = TyInfo.size(); N; --N) 437 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1])); 438 } 439 440 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad. 441 /// 442 void MachineModuleInfo:: 443 addFilterTypeInfo(MachineBasicBlock *LandingPad, 444 ArrayRef<const GlobalVariable *> TyInfo) { 445 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 446 std::vector<unsigned> IdsInFilter(TyInfo.size()); 447 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I) 448 IdsInFilter[I] = getTypeIDFor(TyInfo[I]); 449 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter)); 450 } 451 452 /// addCleanup - Add a cleanup action for a landing pad. 453 /// 454 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) { 455 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 456 LP.TypeIds.push_back(0); 457 } 458 459 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing 460 /// pads. 461 void MachineModuleInfo::TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap) { 462 for (unsigned i = 0; i != LandingPads.size(); ) { 463 LandingPadInfo &LandingPad = LandingPads[i]; 464 if (LandingPad.LandingPadLabel && 465 !LandingPad.LandingPadLabel->isDefined() && 466 (!LPMap || (*LPMap)[LandingPad.LandingPadLabel] == 0)) 467 LandingPad.LandingPadLabel = 0; 468 469 // Special case: we *should* emit LPs with null LP MBB. This indicates 470 // "nounwind" case. 471 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) { 472 LandingPads.erase(LandingPads.begin() + i); 473 continue; 474 } 475 476 for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) { 477 MCSymbol *BeginLabel = LandingPad.BeginLabels[j]; 478 MCSymbol *EndLabel = LandingPad.EndLabels[j]; 479 if ((BeginLabel->isDefined() || 480 (LPMap && (*LPMap)[BeginLabel] != 0)) && 481 (EndLabel->isDefined() || 482 (LPMap && (*LPMap)[EndLabel] != 0))) continue; 483 484 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j); 485 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j); 486 --j, --e; 487 } 488 489 // Remove landing pads with no try-ranges. 490 if (LandingPads[i].BeginLabels.empty()) { 491 LandingPads.erase(LandingPads.begin() + i); 492 continue; 493 } 494 495 // If there is no landing pad, ensure that the list of typeids is empty. 496 // If the only typeid is a cleanup, this is the same as having no typeids. 497 if (!LandingPad.LandingPadBlock || 498 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0])) 499 LandingPad.TypeIds.clear(); 500 ++i; 501 } 502 } 503 504 /// setCallSiteLandingPad - Map the landing pad's EH symbol to the call site 505 /// indexes. 506 void MachineModuleInfo::setCallSiteLandingPad(MCSymbol *Sym, 507 ArrayRef<unsigned> Sites) { 508 LPadToCallSiteMap[Sym].append(Sites.begin(), Sites.end()); 509 } 510 511 /// getTypeIDFor - Return the type id for the specified typeinfo. This is 512 /// function wide. 513 unsigned MachineModuleInfo::getTypeIDFor(const GlobalVariable *TI) { 514 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i) 515 if (TypeInfos[i] == TI) return i + 1; 516 517 TypeInfos.push_back(TI); 518 return TypeInfos.size(); 519 } 520 521 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is 522 /// function wide. 523 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) { 524 // If the new filter coincides with the tail of an existing filter, then 525 // re-use the existing filter. Folding filters more than this requires 526 // re-ordering filters and/or their elements - probably not worth it. 527 for (std::vector<unsigned>::iterator I = FilterEnds.begin(), 528 E = FilterEnds.end(); I != E; ++I) { 529 unsigned i = *I, j = TyIds.size(); 530 531 while (i && j) 532 if (FilterIds[--i] != TyIds[--j]) 533 goto try_next; 534 535 if (!j) 536 // The new filter coincides with range [i, end) of the existing filter. 537 return -(1 + i); 538 539 try_next:; 540 } 541 542 // Add the new filter. 543 int FilterID = -(1 + FilterIds.size()); 544 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1); 545 FilterIds.insert(FilterIds.end(), TyIds.begin(), TyIds.end()); 546 FilterEnds.push_back(FilterIds.size()); 547 FilterIds.push_back(0); // terminator 548 return FilterID; 549 } 550 551 /// getPersonality - Return the personality function for the current function. 552 const Function *MachineModuleInfo::getPersonality() const { 553 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per 554 // function 555 return !LandingPads.empty() ? LandingPads[0].Personality : NULL; 556 } 557 558 /// getPersonalityIndex - Return unique index for current personality 559 /// function. NULL/first personality function should always get zero index. 560 unsigned MachineModuleInfo::getPersonalityIndex() const { 561 const Function* Personality = NULL; 562 563 // Scan landing pads. If there is at least one non-NULL personality - use it. 564 for (unsigned i = 0, e = LandingPads.size(); i != e; ++i) 565 if (LandingPads[i].Personality) { 566 Personality = LandingPads[i].Personality; 567 break; 568 } 569 570 for (unsigned i = 0, e = Personalities.size(); i < e; ++i) { 571 if (Personalities[i] == Personality) 572 return i; 573 } 574 575 // This will happen if the current personality function is 576 // in the zero index. 577 return 0; 578 } 579