lib/CodeGen/MachineModuleInfo.cpp

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