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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/MC/MCObjectFileInfo.h"
21 #include "llvm/MC/MCSymbol.h"
22 #include "llvm/ADT/PointerUnion.h"
23 #include "llvm/Support/Dwarf.h"
24 #include "llvm/Support/ErrorHandling.h"
25 using namespace llvm;
26 using namespace llvm::dwarf;
27 
28 // Handle the Pass registration stuff necessary to use TargetData's.
29 INITIALIZE_PASS(MachineModuleInfo, "machinemoduleinfo",
30                 "Machine Module Information", false, false)
31 char MachineModuleInfo::ID = 0;
32 
33 // Out of line virtual method.
~MachineModuleInfoImpl()34 MachineModuleInfoImpl::~MachineModuleInfoImpl() {}
35 
36 namespace llvm {
37 class MMIAddrLabelMapCallbackPtr : CallbackVH {
38   MMIAddrLabelMap *Map;
39 public:
MMIAddrLabelMapCallbackPtr()40   MMIAddrLabelMapCallbackPtr() : Map(0) {}
MMIAddrLabelMapCallbackPtr(Value * V)41   MMIAddrLabelMapCallbackPtr(Value *V) : CallbackVH(V), Map(0) {}
42 
setPtr(BasicBlock * BB)43   void setPtr(BasicBlock *BB) {
44     ValueHandleBase::operator=(BB);
45   }
46 
setMap(MMIAddrLabelMap * map)47   void setMap(MMIAddrLabelMap *map) { Map = map; }
48 
49   virtual void deleted();
50   virtual void allUsesReplacedWith(Value *V2);
51 };
52 
53 class MMIAddrLabelMap {
54   MCContext &Context;
55   struct AddrLabelSymEntry {
56     /// Symbols - The symbols for the label.  This is a pointer union that is
57     /// either one symbol (the common case) or a list of symbols.
58     PointerUnion<MCSymbol *, std::vector<MCSymbol*>*> Symbols;
59 
60     Function *Fn;   // The containing function of the BasicBlock.
61     unsigned Index; // The index in BBCallbacks for the BasicBlock.
62   };
63 
64   DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry> AddrLabelSymbols;
65 
66   /// BBCallbacks - Callbacks for the BasicBlock's that we have entries for.  We
67   /// use this so we get notified if a block is deleted or RAUWd.
68   std::vector<MMIAddrLabelMapCallbackPtr> BBCallbacks;
69 
70   /// DeletedAddrLabelsNeedingEmission - This is a per-function list of symbols
71   /// whose corresponding BasicBlock got deleted.  These symbols need to be
72   /// emitted at some point in the file, so AsmPrinter emits them after the
73   /// function body.
74   DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >
75     DeletedAddrLabelsNeedingEmission;
76 public:
77 
MMIAddrLabelMap(MCContext & context)78   MMIAddrLabelMap(MCContext &context) : Context(context) {}
~MMIAddrLabelMap()79   ~MMIAddrLabelMap() {
80     assert(DeletedAddrLabelsNeedingEmission.empty() &&
81            "Some labels for deleted blocks never got emitted");
82 
83     // Deallocate any of the 'list of symbols' case.
84     for (DenseMap<AssertingVH<BasicBlock>, AddrLabelSymEntry>::iterator
85          I = AddrLabelSymbols.begin(), E = AddrLabelSymbols.end(); I != E; ++I)
86       if (I->second.Symbols.is<std::vector<MCSymbol*>*>())
87         delete I->second.Symbols.get<std::vector<MCSymbol*>*>();
88   }
89 
90   MCSymbol *getAddrLabelSymbol(BasicBlock *BB);
91   std::vector<MCSymbol*> getAddrLabelSymbolToEmit(BasicBlock *BB);
92 
93   void takeDeletedSymbolsForFunction(Function *F,
94                                      std::vector<MCSymbol*> &Result);
95 
96   void UpdateForDeletedBlock(BasicBlock *BB);
97   void UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New);
98 };
99 }
100 
getAddrLabelSymbol(BasicBlock * BB)101 MCSymbol *MMIAddrLabelMap::getAddrLabelSymbol(BasicBlock *BB) {
102   assert(BB->hasAddressTaken() &&
103          "Shouldn't get label for block without address taken");
104   AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
105 
106   // If we already had an entry for this block, just return it.
107   if (!Entry.Symbols.isNull()) {
108     assert(BB->getParent() == Entry.Fn && "Parent changed");
109     if (Entry.Symbols.is<MCSymbol*>())
110       return Entry.Symbols.get<MCSymbol*>();
111     return (*Entry.Symbols.get<std::vector<MCSymbol*>*>())[0];
112   }
113 
114   // Otherwise, this is a new entry, create a new symbol for it and add an
115   // entry to BBCallbacks so we can be notified if the BB is deleted or RAUWd.
116   BBCallbacks.push_back(BB);
117   BBCallbacks.back().setMap(this);
118   Entry.Index = BBCallbacks.size()-1;
119   Entry.Fn = BB->getParent();
120   MCSymbol *Result = Context.CreateTempSymbol();
121   Entry.Symbols = Result;
122   return Result;
123 }
124 
125 std::vector<MCSymbol*>
getAddrLabelSymbolToEmit(BasicBlock * BB)126 MMIAddrLabelMap::getAddrLabelSymbolToEmit(BasicBlock *BB) {
127   assert(BB->hasAddressTaken() &&
128          "Shouldn't get label for block without address taken");
129   AddrLabelSymEntry &Entry = AddrLabelSymbols[BB];
130 
131   std::vector<MCSymbol*> Result;
132 
133   // If we already had an entry for this block, just return it.
134   if (Entry.Symbols.isNull())
135     Result.push_back(getAddrLabelSymbol(BB));
136   else if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>())
137     Result.push_back(Sym);
138   else
139     Result = *Entry.Symbols.get<std::vector<MCSymbol*>*>();
140   return Result;
141 }
142 
143 
144 /// takeDeletedSymbolsForFunction - If we have any deleted symbols for F, return
145 /// them.
146 void MMIAddrLabelMap::
takeDeletedSymbolsForFunction(Function * F,std::vector<MCSymbol * > & Result)147 takeDeletedSymbolsForFunction(Function *F, std::vector<MCSymbol*> &Result) {
148   DenseMap<AssertingVH<Function>, std::vector<MCSymbol*> >::iterator I =
149     DeletedAddrLabelsNeedingEmission.find(F);
150 
151   // If there are no entries for the function, just return.
152   if (I == DeletedAddrLabelsNeedingEmission.end()) return;
153 
154   // Otherwise, take the list.
155   std::swap(Result, I->second);
156   DeletedAddrLabelsNeedingEmission.erase(I);
157 }
158 
159 
UpdateForDeletedBlock(BasicBlock * BB)160 void MMIAddrLabelMap::UpdateForDeletedBlock(BasicBlock *BB) {
161   // If the block got deleted, there is no need for the symbol.  If the symbol
162   // was already emitted, we can just forget about it, otherwise we need to
163   // queue it up for later emission when the function is output.
164   AddrLabelSymEntry Entry = AddrLabelSymbols[BB];
165   AddrLabelSymbols.erase(BB);
166   assert(!Entry.Symbols.isNull() && "Didn't have a symbol, why a callback?");
167   BBCallbacks[Entry.Index] = 0;  // Clear the callback.
168 
169   assert((BB->getParent() == 0 || BB->getParent() == Entry.Fn) &&
170          "Block/parent mismatch");
171 
172   // Handle both the single and the multiple symbols cases.
173   if (MCSymbol *Sym = Entry.Symbols.dyn_cast<MCSymbol*>()) {
174     if (Sym->isDefined())
175       return;
176 
177     // If the block is not yet defined, we need to emit it at the end of the
178     // function.  Add the symbol to the DeletedAddrLabelsNeedingEmission list
179     // for the containing Function.  Since the block is being deleted, its
180     // parent may already be removed, we have to get the function from 'Entry'.
181     DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
182   } else {
183     std::vector<MCSymbol*> *Syms = Entry.Symbols.get<std::vector<MCSymbol*>*>();
184 
185     for (unsigned i = 0, e = Syms->size(); i != e; ++i) {
186       MCSymbol *Sym = (*Syms)[i];
187       if (Sym->isDefined()) continue;  // Ignore already emitted labels.
188 
189       // If the block is not yet defined, we need to emit it at the end of the
190       // function.  Add the symbol to the DeletedAddrLabelsNeedingEmission list
191       // for the containing Function.  Since the block is being deleted, its
192       // parent may already be removed, we have to get the function from
193       // 'Entry'.
194       DeletedAddrLabelsNeedingEmission[Entry.Fn].push_back(Sym);
195     }
196 
197     // The entry is deleted, free the memory associated with the symbol list.
198     delete Syms;
199   }
200 }
201 
UpdateForRAUWBlock(BasicBlock * Old,BasicBlock * New)202 void MMIAddrLabelMap::UpdateForRAUWBlock(BasicBlock *Old, BasicBlock *New) {
203   // Get the entry for the RAUW'd block and remove it from our map.
204   AddrLabelSymEntry OldEntry = AddrLabelSymbols[Old];
205   AddrLabelSymbols.erase(Old);
206   assert(!OldEntry.Symbols.isNull() && "Didn't have a symbol, why a callback?");
207 
208   AddrLabelSymEntry &NewEntry = AddrLabelSymbols[New];
209 
210   // If New is not address taken, just move our symbol over to it.
211   if (NewEntry.Symbols.isNull()) {
212     BBCallbacks[OldEntry.Index].setPtr(New);    // Update the callback.
213     NewEntry = OldEntry;     // Set New's entry.
214     return;
215   }
216 
217   BBCallbacks[OldEntry.Index] = 0;    // Update the callback.
218 
219   // Otherwise, we need to add the old symbol to the new block's set.  If it is
220   // just a single entry, upgrade it to a symbol list.
221   if (MCSymbol *PrevSym = NewEntry.Symbols.dyn_cast<MCSymbol*>()) {
222     std::vector<MCSymbol*> *SymList = new std::vector<MCSymbol*>();
223     SymList->push_back(PrevSym);
224     NewEntry.Symbols = SymList;
225   }
226 
227   std::vector<MCSymbol*> *SymList =
228     NewEntry.Symbols.get<std::vector<MCSymbol*>*>();
229 
230   // If the old entry was a single symbol, add it.
231   if (MCSymbol *Sym = OldEntry.Symbols.dyn_cast<MCSymbol*>()) {
232     SymList->push_back(Sym);
233     return;
234   }
235 
236   // Otherwise, concatenate the list.
237   std::vector<MCSymbol*> *Syms =OldEntry.Symbols.get<std::vector<MCSymbol*>*>();
238   SymList->insert(SymList->end(), Syms->begin(), Syms->end());
239   delete Syms;
240 }
241 
242 
deleted()243 void MMIAddrLabelMapCallbackPtr::deleted() {
244   Map->UpdateForDeletedBlock(cast<BasicBlock>(getValPtr()));
245 }
246 
allUsesReplacedWith(Value * V2)247 void MMIAddrLabelMapCallbackPtr::allUsesReplacedWith(Value *V2) {
248   Map->UpdateForRAUWBlock(cast<BasicBlock>(getValPtr()), cast<BasicBlock>(V2));
249 }
250 
251 
252 //===----------------------------------------------------------------------===//
253 
MachineModuleInfo(const MCAsmInfo & MAI,const MCRegisterInfo & MRI,const MCObjectFileInfo * MOFI)254 MachineModuleInfo::MachineModuleInfo(const MCAsmInfo &MAI,
255                                      const MCRegisterInfo &MRI,
256                                      const MCObjectFileInfo *MOFI)
257   : ImmutablePass(ID), Context(MAI, MRI, MOFI),
258     ObjFileMMI(0), CompactUnwindEncoding(0), CurCallSite(0), CallsEHReturn(0),
259     CallsUnwindInit(0), DbgInfoAvailable(false),
260     CallsExternalVAFunctionWithFloatingPointArguments(false) {
261   initializeMachineModuleInfoPass(*PassRegistry::getPassRegistry());
262   // Always emit some info, by default "no personality" info.
263   Personalities.push_back(NULL);
264   AddrLabelSymbols = 0;
265   TheModule = 0;
266 }
267 
MachineModuleInfo()268 MachineModuleInfo::MachineModuleInfo()
269   : ImmutablePass(ID),
270     Context(*(MCAsmInfo*)0, *(MCRegisterInfo*)0, (MCObjectFileInfo*)0) {
271   assert(0 && "This MachineModuleInfo constructor should never be called, MMI "
272          "should always be explicitly constructed by LLVMTargetMachine");
273   abort();
274 }
275 
~MachineModuleInfo()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 ///
doInitialization()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 ///
doFinalization()294 bool MachineModuleInfo::doFinalization() {
295   delete AddrLabelSymbols;
296   AddrLabelSymbols = 0;
297   return false;
298 }
299 
300 /// EndFunction - Discard function meta information.
301 ///
EndFunction()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   CompactUnwindEncoding = 0;
315   VariableDbgInfo.clear();
316 }
317 
318 /// AnalyzeModule - Scan the module for global debug information.
319 ///
AnalyzeModule(const Module & M)320 void MachineModuleInfo::AnalyzeModule(const Module &M) {
321   // Insert functions in the llvm.used array (but not llvm.compiler.used) into
322   // UsedFunctions.
323   const GlobalVariable *GV = M.getGlobalVariable("llvm.used");
324   if (!GV || !GV->hasInitializer()) return;
325 
326   // Should be an array of 'i8*'.
327   const ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
328   if (InitList == 0) return;
329 
330   for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
331     if (const Function *F =
332           dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts()))
333       UsedFunctions.insert(F);
334 }
335 
336 //===- Address of Block Management ----------------------------------------===//
337 
338 
339 /// getAddrLabelSymbol - Return the symbol to be used for the specified basic
340 /// block when its address is taken.  This cannot be its normal LBB label
341 /// because the block may be accessed outside its containing function.
getAddrLabelSymbol(const BasicBlock * BB)342 MCSymbol *MachineModuleInfo::getAddrLabelSymbol(const BasicBlock *BB) {
343   // Lazily create AddrLabelSymbols.
344   if (AddrLabelSymbols == 0)
345     AddrLabelSymbols = new MMIAddrLabelMap(Context);
346   return AddrLabelSymbols->getAddrLabelSymbol(const_cast<BasicBlock*>(BB));
347 }
348 
349 /// getAddrLabelSymbolToEmit - Return the symbol to be used for the specified
350 /// basic block when its address is taken.  If other blocks were RAUW'd to
351 /// this one, we may have to emit them as well, return the whole set.
352 std::vector<MCSymbol*> MachineModuleInfo::
getAddrLabelSymbolToEmit(const BasicBlock * BB)353 getAddrLabelSymbolToEmit(const BasicBlock *BB) {
354   // Lazily create AddrLabelSymbols.
355   if (AddrLabelSymbols == 0)
356     AddrLabelSymbols = new MMIAddrLabelMap(Context);
357  return AddrLabelSymbols->getAddrLabelSymbolToEmit(const_cast<BasicBlock*>(BB));
358 }
359 
360 
361 /// takeDeletedSymbolsForFunction - If the specified function has had any
362 /// references to address-taken blocks generated, but the block got deleted,
363 /// return the symbol now so we can emit it.  This prevents emitting a
364 /// reference to a symbol that has no definition.
365 void MachineModuleInfo::
takeDeletedSymbolsForFunction(const Function * F,std::vector<MCSymbol * > & Result)366 takeDeletedSymbolsForFunction(const Function *F,
367                               std::vector<MCSymbol*> &Result) {
368   // If no blocks have had their addresses taken, we're done.
369   if (AddrLabelSymbols == 0) return;
370   return AddrLabelSymbols->
371      takeDeletedSymbolsForFunction(const_cast<Function*>(F), Result);
372 }
373 
374 //===- EH -----------------------------------------------------------------===//
375 
376 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the
377 /// specified MachineBasicBlock.
getOrCreateLandingPadInfo(MachineBasicBlock * LandingPad)378 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo
379     (MachineBasicBlock *LandingPad) {
380   unsigned N = LandingPads.size();
381   for (unsigned i = 0; i < N; ++i) {
382     LandingPadInfo &LP = LandingPads[i];
383     if (LP.LandingPadBlock == LandingPad)
384       return LP;
385   }
386 
387   LandingPads.push_back(LandingPadInfo(LandingPad));
388   return LandingPads[N];
389 }
390 
391 /// addInvoke - Provide the begin and end labels of an invoke style call and
392 /// associate it with a try landing pad block.
addInvoke(MachineBasicBlock * LandingPad,MCSymbol * BeginLabel,MCSymbol * EndLabel)393 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad,
394                                   MCSymbol *BeginLabel, MCSymbol *EndLabel) {
395   LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
396   LP.BeginLabels.push_back(BeginLabel);
397   LP.EndLabels.push_back(EndLabel);
398 }
399 
400 /// addLandingPad - Provide the label of a try LandingPad block.
401 ///
addLandingPad(MachineBasicBlock * LandingPad)402 MCSymbol *MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) {
403   MCSymbol *LandingPadLabel = Context.CreateTempSymbol();
404   LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
405   LP.LandingPadLabel = LandingPadLabel;
406   return LandingPadLabel;
407 }
408 
409 /// addPersonality - Provide the personality function for the exception
410 /// information.
addPersonality(MachineBasicBlock * LandingPad,const Function * Personality)411 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad,
412                                        const Function *Personality) {
413   LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
414   LP.Personality = Personality;
415 
416   for (unsigned i = 0; i < Personalities.size(); ++i)
417     if (Personalities[i] == Personality)
418       return;
419 
420   // If this is the first personality we're adding go
421   // ahead and add it at the beginning.
422   if (Personalities[0] == NULL)
423     Personalities[0] = Personality;
424   else
425     Personalities.push_back(Personality);
426 }
427 
428 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad.
429 ///
430 void MachineModuleInfo::
addCatchTypeInfo(MachineBasicBlock * LandingPad,ArrayRef<const GlobalVariable * > TyInfo)431 addCatchTypeInfo(MachineBasicBlock *LandingPad,
432                  ArrayRef<const GlobalVariable *> TyInfo) {
433   LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
434   for (unsigned N = TyInfo.size(); N; --N)
435     LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1]));
436 }
437 
438 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad.
439 ///
440 void MachineModuleInfo::
addFilterTypeInfo(MachineBasicBlock * LandingPad,ArrayRef<const GlobalVariable * > TyInfo)441 addFilterTypeInfo(MachineBasicBlock *LandingPad,
442                   ArrayRef<const GlobalVariable *> TyInfo) {
443   LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
444   std::vector<unsigned> IdsInFilter(TyInfo.size());
445   for (unsigned I = 0, E = TyInfo.size(); I != E; ++I)
446     IdsInFilter[I] = getTypeIDFor(TyInfo[I]);
447   LP.TypeIds.push_back(getFilterIDFor(IdsInFilter));
448 }
449 
450 /// addCleanup - Add a cleanup action for a landing pad.
451 ///
addCleanup(MachineBasicBlock * LandingPad)452 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) {
453   LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad);
454   LP.TypeIds.push_back(0);
455 }
456 
457 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing
458 /// pads.
TidyLandingPads(DenseMap<MCSymbol *,uintptr_t> * LPMap)459 void MachineModuleInfo::TidyLandingPads(DenseMap<MCSymbol*, uintptr_t> *LPMap) {
460   for (unsigned i = 0; i != LandingPads.size(); ) {
461     LandingPadInfo &LandingPad = LandingPads[i];
462     if (LandingPad.LandingPadLabel &&
463         !LandingPad.LandingPadLabel->isDefined() &&
464         (!LPMap || (*LPMap)[LandingPad.LandingPadLabel] == 0))
465       LandingPad.LandingPadLabel = 0;
466 
467     // Special case: we *should* emit LPs with null LP MBB. This indicates
468     // "nounwind" case.
469     if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) {
470       LandingPads.erase(LandingPads.begin() + i);
471       continue;
472     }
473 
474     for (unsigned j = 0, e = LandingPads[i].BeginLabels.size(); j != e; ++j) {
475       MCSymbol *BeginLabel = LandingPad.BeginLabels[j];
476       MCSymbol *EndLabel = LandingPad.EndLabels[j];
477       if ((BeginLabel->isDefined() ||
478            (LPMap && (*LPMap)[BeginLabel] != 0)) &&
479           (EndLabel->isDefined() ||
480            (LPMap && (*LPMap)[EndLabel] != 0))) continue;
481 
482       LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j);
483       LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j);
484       --j, --e;
485     }
486 
487     // Remove landing pads with no try-ranges.
488     if (LandingPads[i].BeginLabels.empty()) {
489       LandingPads.erase(LandingPads.begin() + i);
490       continue;
491     }
492 
493     // If there is no landing pad, ensure that the list of typeids is empty.
494     // If the only typeid is a cleanup, this is the same as having no typeids.
495     if (!LandingPad.LandingPadBlock ||
496         (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0]))
497       LandingPad.TypeIds.clear();
498     ++i;
499   }
500 }
501 
502 /// setCallSiteLandingPad - Map the landing pad's EH symbol to the call site
503 /// indexes.
setCallSiteLandingPad(MCSymbol * Sym,ArrayRef<unsigned> Sites)504 void MachineModuleInfo::setCallSiteLandingPad(MCSymbol *Sym,
505                                               ArrayRef<unsigned> Sites) {
506   for (unsigned I = 0, E = Sites.size(); I != E; ++I)
507     LPadToCallSiteMap[Sym].push_back(Sites[I]);
508 }
509 
510 /// getTypeIDFor - Return the type id for the specified typeinfo.  This is
511 /// function wide.
getTypeIDFor(const GlobalVariable * TI)512 unsigned 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.
getFilterIDFor(std::vector<unsigned> & TyIds)522 int 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 
538 try_next:;
539   }
540 
541   // Add the new filter.
542   int FilterID = -(1 + FilterIds.size());
543   FilterIds.reserve(FilterIds.size() + TyIds.size() + 1);
544   for (unsigned I = 0, N = TyIds.size(); I != N; ++I)
545     FilterIds.push_back(TyIds[I]);
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.
getPersonality() const552 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.
getPersonalityIndex() const560 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; i != LandingPads.size(); ++i)
565     if (LandingPads[i].Personality) {
566       Personality = LandingPads[i].Personality;
567       break;
568     }
569 
570   for (unsigned i = 0; i < Personalities.size(); ++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