MachineModuleInfo.cpp revision 251662
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" 24using namespace llvm; 25using namespace llvm::dwarf; 26 27// Handle the Pass registration stuff necessary to use DataLayout's. 28INITIALIZE_PASS(MachineModuleInfo, "machinemoduleinfo", 29 "Machine Module Information", false, false) 30char MachineModuleInfo::ID = 0; 31 32// Out of line virtual method. 33MachineModuleInfoImpl::~MachineModuleInfoImpl() {} 34 35namespace llvm { 36class MMIAddrLabelMapCallbackPtr : CallbackVH { 37 MMIAddrLabelMap *Map; 38public: 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 52class 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; 75public: 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 100MCSymbol *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 124std::vector<MCSymbol*> 125MMIAddrLabelMap::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. 145void MMIAddrLabelMap:: 146takeDeletedSymbolsForFunction(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 159void 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 201void 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 242void MMIAddrLabelMapCallbackPtr::deleted() { 243 Map->UpdateForDeletedBlock(cast<BasicBlock>(getValPtr())); 244} 245 246void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) { 247 Map->UpdateForRAUWBlock(cast<BasicBlock>(getValPtr()), cast<BasicBlock>(V2)); 248} 249 250 251//===----------------------------------------------------------------------===// 252 253MachineModuleInfo::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 260MachineModuleInfo::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 268MachineModuleInfo::~MachineModuleInfo() { 269} 270 271bool 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 287bool 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/// 304void 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/// 322void 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 = cast<ConstantArray>(GV->getInitializer()); 330 331 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 332 if (const Function *F = 333 dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts())) 334 UsedFunctions.insert(F); 335} 336 337//===- Address of Block Management ----------------------------------------===// 338 339 340/// getAddrLabelSymbol - Return the symbol to be used for the specified basic 341/// block when its address is taken. This cannot be its normal LBB label 342/// because the block may be accessed outside its containing function. 343MCSymbol *MachineModuleInfo::getAddrLabelSymbol(const BasicBlock *BB) { 344 // Lazily create AddrLabelSymbols. 345 if (AddrLabelSymbols == 0) 346 AddrLabelSymbols = new MMIAddrLabelMap(Context); 347 return AddrLabelSymbols->getAddrLabelSymbol(const_cast<BasicBlock*>(BB)); 348} 349 350/// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified 351/// basic block when its address is taken. If other blocks were RAUW'd to 352/// this one, we may have to emit them as well, return the whole set. 353std::vector<MCSymbol*> MachineModuleInfo:: 354getAddrLabelSymbolToEmit(const BasicBlock *BB) { 355 // Lazily create AddrLabelSymbols. 356 if (AddrLabelSymbols == 0) 357 AddrLabelSymbols = new MMIAddrLabelMap(Context); 358 return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB)); 359} 360 361 362/// takeDeletedSymbolsForFunction - If the specified function has had any 363/// references to address-taken blocks generated, but the block got deleted, 364/// return the symbol now so we can emit it. This prevents emitting a 365/// reference to a symbol that has no definition. 366void MachineModuleInfo:: 367takeDeletedSymbolsForFunction(const Function *F, 368 std::vector<MCSymbol*> &Result) { 369 // If no blocks have had their addresses taken, we're done. 370 if (AddrLabelSymbols == 0) return; 371 return AddrLabelSymbols-> 372 takeDeletedSymbolsForFunction(const_cast<Function*>(F), Result); 373} 374 375//===- EH -----------------------------------------------------------------===// 376 377/// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the 378/// specified MachineBasicBlock. 379LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo 380 (MachineBasicBlock *LandingPad) { 381 unsigned N = LandingPads.size(); 382 for (unsigned i = 0; i < N; ++i) { 383 LandingPadInfo &LP = LandingPads[i]; 384 if (LP.LandingPadBlock == LandingPad) 385 return LP; 386 } 387 388 LandingPads.push_back(LandingPadInfo(LandingPad)); 389 return LandingPads[N]; 390} 391 392/// addInvoke - Provide the begin and end labels of an invoke style call and 393/// associate it with a try landing pad block. 394void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad, 395 MCSymbol *BeginLabel, MCSymbol *EndLabel) { 396 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 397 LP.BeginLabels.push_back(BeginLabel); 398 LP.EndLabels.push_back(EndLabel); 399} 400 401/// addLandingPad - Provide the label of a try LandingPad block. 402/// 403MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) { 404 MCSymbol *LandingPadLabel = Context.CreateTempSymbol(); 405 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 406 LP.LandingPadLabel = LandingPadLabel; 407 return LandingPadLabel; 408} 409 410/// addPersonality - Provide the personality function for the exception 411/// information. 412void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad, 413 const Function *Personality) { 414 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 415 LP.Personality = Personality; 416 417 for (unsigned i = 0; i < Personalities.size(); ++i) 418 if (Personalities[i] == Personality) 419 return; 420 421 // If this is the first personality we're adding go 422 // ahead and add it at the beginning. 423 if (Personalities[0] == NULL) 424 Personalities[0] = Personality; 425 else 426 Personalities.push_back(Personality); 427} 428 429/// addCatchTypeInfo - Provide the catch typeinfo for a landing pad. 430/// 431void MachineModuleInfo:: 432addCatchTypeInfo(MachineBasicBlock *LandingPad, 433 ArrayRef<const GlobalVariable *> TyInfo) { 434 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 435 for (unsigned N = TyInfo.size(); N; --N) 436 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1])); 437} 438 439/// addFilterTypeInfo - Provide the filter typeinfo for a landing pad. 440/// 441void MachineModuleInfo:: 442addFilterTypeInfo(MachineBasicBlock *LandingPad, 443 ArrayRef<const GlobalVariable *> TyInfo) { 444 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 445 std::vector<unsigned> IdsInFilter(TyInfo.size()); 446 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I) 447 IdsInFilter[I] = getTypeIDFor(TyInfo[I]); 448 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter)); 449} 450 451/// addCleanup - Add a cleanup action for a landing pad. 452/// 453void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) { 454 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 455 LP.TypeIds.push_back(0); 456} 457 458/// TidyLandingPads - Remap landing pad labels and remove any deleted landing 459/// pads. 460void MachineModuleInfo::TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap) { 461 for (unsigned i = 0; i != LandingPads.size(); ) { 462 LandingPadInfo &LandingPad = LandingPads[i]; 463 if (LandingPad.LandingPadLabel && 464 !LandingPad.LandingPadLabel->isDefined() && 465 (!LPMap || (*LPMap)[LandingPad.LandingPadLabel] == 0)) 466 LandingPad.LandingPadLabel = 0; 467 468 // Special case: we *should* emit LPs with null LP MBB. This indicates 469 // "nounwind" case. 470 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) { 471 LandingPads.erase(LandingPads.begin() + i); 472 continue; 473 } 474 475 for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) { 476 MCSymbol *BeginLabel = LandingPad.BeginLabels[j]; 477 MCSymbol *EndLabel = LandingPad.EndLabels[j]; 478 if ((BeginLabel->isDefined() || 479 (LPMap && (*LPMap)[BeginLabel] != 0)) && 480 (EndLabel->isDefined() || 481 (LPMap && (*LPMap)[EndLabel] != 0))) continue; 482 483 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j); 484 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j); 485 --j, --e; 486 } 487 488 // Remove landing pads with no try-ranges. 489 if (LandingPads[i].BeginLabels.empty()) { 490 LandingPads.erase(LandingPads.begin() + i); 491 continue; 492 } 493 494 // If there is no landing pad, ensure that the list of typeids is empty. 495 // If the only typeid is a cleanup, this is the same as having no typeids. 496 if (!LandingPad.LandingPadBlock || 497 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0])) 498 LandingPad.TypeIds.clear(); 499 ++i; 500 } 501} 502 503/// setCallSiteLandingPad - Map the landing pad's EH symbol to the call site 504/// indexes. 505void MachineModuleInfo::setCallSiteLandingPad(MCSymbol *Sym, 506 ArrayRef<unsigned> Sites) { 507 LPadToCallSiteMap[Sym].append(Sites.begin(), Sites.end()); 508} 509 510/// getTypeIDFor - Return the type id for the specified typeinfo. This is 511/// function wide. 512unsigned MachineModuleInfo::getTypeIDFor(const GlobalVariable *TI) { 513 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i) 514 if (TypeInfos[i] == TI) return i + 1; 515 516 TypeInfos.push_back(TI); 517 return TypeInfos.size(); 518} 519 520/// getFilterIDFor - Return the filter id for the specified typeinfos. This is 521/// function wide. 522int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) { 523 // If the new filter coincides with the tail of an existing filter, then 524 // re-use the existing filter. Folding filters more than this requires 525 // re-ordering filters and/or their elements - probably not worth it. 526 for (std::vector<unsigned>::iterator I = FilterEnds.begin(), 527 E = FilterEnds.end(); I != E; ++I) { 528 unsigned i = *I, j = TyIds.size(); 529 530 while (i && j) 531 if (FilterIds[--i] != TyIds[--j]) 532 goto try_next; 533 534 if (!j) 535 // The new filter coincides with range [i, end) of the existing filter. 536 return -(1 + i); 537 538try_next:; 539 } 540 541 // Add the new filter. 542 int FilterID = -(1 + FilterIds.size()); 543 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1); 544 FilterIds.insert(FilterIds.end(), TyIds.begin(), TyIds.end()); 545 FilterEnds.push_back(FilterIds.size()); 546 FilterIds.push_back(0); // terminator 547 return FilterID; 548} 549 550/// getPersonality - Return the personality function for the current function. 551const Function *MachineModuleInfo::getPersonality() const { 552 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per 553 // function 554 return !LandingPads.empty() ? LandingPads[0].Personality : NULL; 555} 556 557/// getPersonalityIndex - Return unique index for current personality 558/// function. NULL/first personality function should always get zero index. 559unsigned MachineModuleInfo::getPersonalityIndex() const { 560 const Function* Personality = NULL; 561 562 // Scan landing pads. If there is at least one non-NULL personality - use it. 563 for (unsigned i = 0, e = LandingPads.size(); i != e; ++i) 564 if (LandingPads[i].Personality) { 565 Personality = LandingPads[i].Personality; 566 break; 567 } 568 569 for (unsigned i = 0, e = Personalities.size(); i < e; ++i) { 570 if (Personalities[i] == Personality) 571 return i; 572 } 573 574 // This will happen if the current personality function is 575 // in the zero index. 576 return 0; 577} 578