X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FAnalysis%2FAliasSetTracker.cpp;h=5fabe75c6b255102384dad6f6249d6f5e52b5def;hb=b9b369fa9983843c4ed77b3a35b6e9b7933955bb;hp=250396afdf17c122ccc1b13cbec569eb4c95ab21;hpb=6726b6d75a8b679068a58cb954ba97cf9d1690ba;p=oota-llvm.git diff --git a/lib/Analysis/AliasSetTracker.cpp b/lib/Analysis/AliasSetTracker.cpp index 250396afdf1..5fabe75c6b2 100644 --- a/lib/Analysis/AliasSetTracker.cpp +++ b/lib/Analysis/AliasSetTracker.cpp @@ -15,14 +15,14 @@ #include "llvm/Analysis/AliasAnalysis.h" #include "llvm/Instructions.h" #include "llvm/IntrinsicInst.h" +#include "llvm/LLVMContext.h" #include "llvm/Pass.h" #include "llvm/Type.h" #include "llvm/Target/TargetData.h" #include "llvm/Assembly/Writer.h" -#include "llvm/Support/Compiler.h" +#include "llvm/Support/Debug.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/InstIterator.h" -#include "llvm/Support/Format.h" #include "llvm/Support/raw_ostream.h" using namespace llvm; @@ -35,6 +35,7 @@ void AliasSet::mergeSetIn(AliasSet &AS, AliasSetTracker &AST) { // Update the alias and access types of this set... AccessTy |= AS.AccessTy; AliasTy |= AS.AliasTy; + Volatile |= AS.Volatile; if (AliasTy == MustAlias) { // Check that these two merged sets really are must aliases. Since both @@ -45,7 +46,12 @@ void AliasSet::mergeSetIn(AliasSet &AS, AliasSetTracker &AST) { PointerRec *R = AS.getSomePointer(); // If the pointers are not a must-alias pair, this set becomes a may alias. - if (AA.alias(L->getValue(), L->getSize(), R->getValue(), R->getSize()) + if (AA.alias(AliasAnalysis::Location(L->getValue(), + L->getSize(), + L->getTBAAInfo()), + AliasAnalysis::Location(R->getValue(), + R->getSize(), + R->getTBAAInfo())) != AliasAnalysis::MustAlias) AliasTy = MayAlias; } @@ -87,7 +93,8 @@ void AliasSet::removeFromTracker(AliasSetTracker &AST) { } void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry, - unsigned Size, bool KnownMustAlias) { + uint64_t Size, const MDNode *TBAAInfo, + bool KnownMustAlias) { assert(!Entry.hasAliasSet() && "Entry already in set!"); // Check to see if we have to downgrade to _may_ alias. @@ -95,32 +102,34 @@ void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry, if (PointerRec *P = getSomePointer()) { AliasAnalysis &AA = AST.getAliasAnalysis(); AliasAnalysis::AliasResult Result = - AA.alias(P->getValue(), P->getSize(), Entry.getValue(), Size); + AA.alias(AliasAnalysis::Location(P->getValue(), P->getSize(), + P->getTBAAInfo()), + AliasAnalysis::Location(Entry.getValue(), Size, TBAAInfo)); if (Result == AliasAnalysis::MayAlias) AliasTy = MayAlias; else // First entry of must alias must have maximum size! - P->updateSize(Size); + P->updateSizeAndTBAAInfo(Size, TBAAInfo); assert(Result != AliasAnalysis::NoAlias && "Cannot be part of must set!"); } Entry.setAliasSet(this); - Entry.updateSize(Size); + Entry.updateSizeAndTBAAInfo(Size, TBAAInfo); // Add it to the end of the list... assert(*PtrListEnd == 0 && "End of list is not null?"); *PtrListEnd = &Entry; PtrListEnd = Entry.setPrevInList(PtrListEnd); assert(*PtrListEnd == 0 && "End of list is not null?"); - addRef(); // Entry points to alias set... + addRef(); // Entry points to alias set. } void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) { - CallSites.push_back(CS); + CallSites.push_back(CS.getInstruction()); AliasAnalysis::ModRefBehavior Behavior = AA.getModRefBehavior(CS); if (Behavior == AliasAnalysis::DoesNotAccessMemory) return; - else if (Behavior == AliasAnalysis::OnlyReadsMemory) { + if (AliasAnalysis::onlyReadsMemory(Behavior)) { AliasTy = MayAlias; AccessTy |= Refs; return; @@ -134,32 +143,36 @@ void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) { /// aliasesPointer - Return true if the specified pointer "may" (or must) /// alias one of the members in the set. /// -bool AliasSet::aliasesPointer(const Value *Ptr, unsigned Size, +bool AliasSet::aliasesPointer(const Value *Ptr, uint64_t Size, + const MDNode *TBAAInfo, AliasAnalysis &AA) const { if (AliasTy == MustAlias) { assert(CallSites.empty() && "Illegal must alias set!"); // If this is a set of MustAliases, only check to see if the pointer aliases - // SOME value in the set... + // SOME value in the set. PointerRec *SomePtr = getSomePointer(); assert(SomePtr && "Empty must-alias set??"); - return AA.alias(SomePtr->getValue(), SomePtr->getSize(), Ptr, Size); + return AA.alias(AliasAnalysis::Location(SomePtr->getValue(), + SomePtr->getSize(), + SomePtr->getTBAAInfo()), + AliasAnalysis::Location(Ptr, Size, TBAAInfo)); } // If this is a may-alias set, we have to check all of the pointers in the set // to be sure it doesn't alias the set... for (iterator I = begin(), E = end(); I != E; ++I) - if (AA.alias(Ptr, Size, I.getPointer(), I.getSize())) + if (AA.alias(AliasAnalysis::Location(Ptr, Size, TBAAInfo), + AliasAnalysis::Location(I.getPointer(), I.getSize(), + I.getTBAAInfo()))) return true; // Check the call sites list and invoke list... if (!CallSites.empty()) { - if (AA.hasNoModRefInfoForCalls()) - return true; - for (unsigned i = 0, e = CallSites.size(); i != e; ++i) - if (AA.getModRefInfo(CallSites[i], const_cast(Ptr), Size) - != AliasAnalysis::NoModRef) + if (AA.getModRefInfo(CallSites[i], + AliasAnalysis::Location(Ptr, Size, TBAAInfo)) != + AliasAnalysis::NoModRef) return true; } @@ -170,13 +183,11 @@ bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const { if (AA.doesNotAccessMemory(CS)) return false; - if (AA.hasNoModRefInfoForCalls()) - return true; - - for (unsigned i = 0, e = CallSites.size(); i != e; ++i) - if (AA.getModRefInfo(CallSites[i], CS) != AliasAnalysis::NoModRef || - AA.getModRefInfo(CS, CallSites[i]) != AliasAnalysis::NoModRef) + for (unsigned i = 0, e = CallSites.size(); i != e; ++i) { + if (AA.getModRefInfo(getCallSite(i), CS) != AliasAnalysis::NoModRef || + AA.getModRefInfo(CS, getCallSite(i)) != AliasAnalysis::NoModRef) return true; + } for (iterator I = begin(), E = end(); I != E; ++I) if (AA.getModRefInfo(CS, I.getPointer(), I.getSize()) != @@ -204,16 +215,18 @@ void AliasSetTracker::clear() { /// that may alias the pointer, merge them together and return the unified set. /// AliasSet *AliasSetTracker::findAliasSetForPointer(const Value *Ptr, - unsigned Size) { + uint64_t Size, + const MDNode *TBAAInfo) { AliasSet *FoundSet = 0; - for (iterator I = begin(), E = end(); I != E; ++I) - if (!I->Forward && I->aliasesPointer(Ptr, Size, AA)) { - if (FoundSet == 0) { // If this is the first alias set ptr can go into. - FoundSet = I; // Remember it. - } else { // Otherwise, we must merge the sets. - FoundSet->mergeSetIn(*I, *this); // Merge in contents. - } + for (iterator I = begin(), E = end(); I != E; ++I) { + if (I->Forward || !I->aliasesPointer(Ptr, Size, TBAAInfo, AA)) continue; + + if (FoundSet == 0) { // If this is the first alias set ptr can go into. + FoundSet = I; // Remember it. + } else { // Otherwise, we must merge the sets. + FoundSet->mergeSetIn(*I, *this); // Merge in contents. } + } return FoundSet; } @@ -221,9 +234,10 @@ AliasSet *AliasSetTracker::findAliasSetForPointer(const Value *Ptr, /// containsPointer - Return true if the specified location is represented by /// this alias set, false otherwise. This does not modify the AST object or /// alias sets. -bool AliasSetTracker::containsPointer(Value *Ptr, unsigned Size) const { +bool AliasSetTracker::containsPointer(Value *Ptr, uint64_t Size, + const MDNode *TBAAInfo) const { for (const_iterator I = begin(), E = end(); I != E; ++I) - if (!I->Forward && I->aliasesPointer(Ptr, Size, AA)) + if (!I->Forward && I->aliasesPointer(Ptr, Size, TBAAInfo, AA)) return true; return false; } @@ -232,15 +246,15 @@ bool AliasSetTracker::containsPointer(Value *Ptr, unsigned Size) const { AliasSet *AliasSetTracker::findAliasSetForCallSite(CallSite CS) { AliasSet *FoundSet = 0; - for (iterator I = begin(), E = end(); I != E; ++I) - if (!I->Forward && I->aliasesCallSite(CS, AA)) { - if (FoundSet == 0) { // If this is the first alias set ptr can go into. - FoundSet = I; // Remember it. - } else if (!I->Forward) { // Otherwise, we must merge the sets. - FoundSet->mergeSetIn(*I, *this); // Merge in contents. - } - } - + for (iterator I = begin(), E = end(); I != E; ++I) { + if (I->Forward || !I->aliasesCallSite(CS, AA)) + continue; + + if (FoundSet == 0) // If this is the first alias set ptr can go into. + FoundSet = I; // Remember it. + else if (!I->Forward) // Otherwise, we must merge the sets. + FoundSet->mergeSetIn(*I, *this); // Merge in contents. + } return FoundSet; } @@ -249,31 +263,34 @@ AliasSet *AliasSetTracker::findAliasSetForCallSite(CallSite CS) { /// getAliasSetForPointer - Return the alias set that the specified pointer /// lives in. -AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, unsigned Size, +AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, uint64_t Size, + const MDNode *TBAAInfo, bool *New) { AliasSet::PointerRec &Entry = getEntryFor(Pointer); - // Check to see if the pointer is already known... + // Check to see if the pointer is already known. if (Entry.hasAliasSet()) { - Entry.updateSize(Size); + Entry.updateSizeAndTBAAInfo(Size, TBAAInfo); // Return the set! return *Entry.getAliasSet(*this)->getForwardedTarget(*this); - } else if (AliasSet *AS = findAliasSetForPointer(Pointer, Size)) { - // Add it to the alias set it aliases... - AS->addPointer(*this, Entry, Size); + } + + if (AliasSet *AS = findAliasSetForPointer(Pointer, Size, TBAAInfo)) { + // Add it to the alias set it aliases. + AS->addPointer(*this, Entry, Size, TBAAInfo); return *AS; - } else { - if (New) *New = true; - // Otherwise create a new alias set to hold the loaded pointer... - AliasSets.push_back(new AliasSet()); - AliasSets.back().addPointer(*this, Entry, Size); - return AliasSets.back(); } + + if (New) *New = true; + // Otherwise create a new alias set to hold the loaded pointer. + AliasSets.push_back(new AliasSet()); + AliasSets.back().addPointer(*this, Entry, Size, TBAAInfo); + return AliasSets.back(); } -bool AliasSetTracker::add(Value *Ptr, unsigned Size) { +bool AliasSetTracker::add(Value *Ptr, uint64_t Size, const MDNode *TBAAInfo) { bool NewPtr; - addPointer(Ptr, Size, AliasSet::NoModRef, NewPtr); + addPointer(Ptr, Size, TBAAInfo, AliasSet::NoModRef, NewPtr); return NewPtr; } @@ -282,6 +299,7 @@ bool AliasSetTracker::add(LoadInst *LI) { bool NewPtr; AliasSet &AS = addPointer(LI->getOperand(0), AA.getTypeStoreSize(LI->getType()), + LI->getMetadata(LLVMContext::MD_tbaa), AliasSet::Refs, NewPtr); if (LI->isVolatile()) AS.setVolatile(); return NewPtr; @@ -292,20 +310,17 @@ bool AliasSetTracker::add(StoreInst *SI) { Value *Val = SI->getOperand(0); AliasSet &AS = addPointer(SI->getOperand(1), AA.getTypeStoreSize(Val->getType()), + SI->getMetadata(LLVMContext::MD_tbaa), AliasSet::Mods, NewPtr); if (SI->isVolatile()) AS.setVolatile(); return NewPtr; } -bool AliasSetTracker::add(FreeInst *FI) { - bool NewPtr; - addPointer(FI->getOperand(0), ~0, AliasSet::Mods, NewPtr); - return NewPtr; -} - bool AliasSetTracker::add(VAArgInst *VAAI) { bool NewPtr; - addPointer(VAAI->getOperand(0), ~0, AliasSet::ModRef, NewPtr); + addPointer(VAAI->getOperand(0), AliasAnalysis::UnknownSize, + VAAI->getMetadata(LLVMContext::MD_tbaa), + AliasSet::ModRef, NewPtr); return NewPtr; } @@ -317,30 +332,27 @@ bool AliasSetTracker::add(CallSite CS) { return true; // doesn't alias anything AliasSet *AS = findAliasSetForCallSite(CS); - if (!AS) { - AliasSets.push_back(new AliasSet()); - AS = &AliasSets.back(); - AS->addCallSite(CS, AA); - return true; - } else { + if (AS) { AS->addCallSite(CS, AA); return false; } + AliasSets.push_back(new AliasSet()); + AS = &AliasSets.back(); + AS->addCallSite(CS, AA); + return true; } bool AliasSetTracker::add(Instruction *I) { - // Dispatch to one of the other add methods... + // Dispatch to one of the other add methods. if (LoadInst *LI = dyn_cast(I)) return add(LI); - else if (StoreInst *SI = dyn_cast(I)) + if (StoreInst *SI = dyn_cast(I)) return add(SI); - else if (CallInst *CI = dyn_cast(I)) + if (CallInst *CI = dyn_cast(I)) return add(CI); - else if (InvokeInst *II = dyn_cast(I)) + if (InvokeInst *II = dyn_cast(I)) return add(II); - else if (FreeInst *FI = dyn_cast(I)) - return add(FI); - else if (VAArgInst *VAAI = dyn_cast(I)) + if (VAArgInst *VAAI = dyn_cast(I)) return add(VAAI); return true; } @@ -357,23 +369,24 @@ void AliasSetTracker::add(const AliasSetTracker &AST) { // Loop over all of the alias sets in AST, adding the pointers contained // therein into the current alias sets. This can cause alias sets to be // merged together in the current AST. - for (const_iterator I = AST.begin(), E = AST.end(); I != E; ++I) - if (!I->Forward) { // Ignore forwarding alias sets - AliasSet &AS = const_cast(*I); - - // If there are any call sites in the alias set, add them to this AST. - for (unsigned i = 0, e = AS.CallSites.size(); i != e; ++i) - add(AS.CallSites[i]); - - // Loop over all of the pointers in this alias set... - AliasSet::iterator I = AS.begin(), E = AS.end(); - bool X; - for (; I != E; ++I) { - AliasSet &NewAS = addPointer(I.getPointer(), I.getSize(), - (AliasSet::AccessType)AS.AccessTy, X); - if (AS.isVolatile()) NewAS.setVolatile(); - } + for (const_iterator I = AST.begin(), E = AST.end(); I != E; ++I) { + if (I->Forward) continue; // Ignore forwarding alias sets + + AliasSet &AS = const_cast(*I); + + // If there are any call sites in the alias set, add them to this AST. + for (unsigned i = 0, e = AS.CallSites.size(); i != e; ++i) + add(AS.CallSites[i]); + + // Loop over all of the pointers in this alias set. + bool X; + for (AliasSet::iterator ASI = AS.begin(), E = AS.end(); ASI != E; ++ASI) { + AliasSet &NewAS = addPointer(ASI.getPointer(), ASI.getSize(), + ASI.getTBAAInfo(), + (AliasSet::AccessType)AS.AccessTy, X); + if (AS.isVolatile()) NewAS.setVolatile(); } + } } /// remove - Remove the specified (potentially non-empty) alias set from the @@ -405,38 +418,36 @@ void AliasSetTracker::remove(AliasSet &AS) { AS.removeFromTracker(*this); } -bool AliasSetTracker::remove(Value *Ptr, unsigned Size) { - AliasSet *AS = findAliasSetForPointer(Ptr, Size); +bool +AliasSetTracker::remove(Value *Ptr, uint64_t Size, const MDNode *TBAAInfo) { + AliasSet *AS = findAliasSetForPointer(Ptr, Size, TBAAInfo); if (!AS) return false; remove(*AS); return true; } bool AliasSetTracker::remove(LoadInst *LI) { - unsigned Size = AA.getTypeStoreSize(LI->getType()); - AliasSet *AS = findAliasSetForPointer(LI->getOperand(0), Size); + uint64_t Size = AA.getTypeStoreSize(LI->getType()); + const MDNode *TBAAInfo = LI->getMetadata(LLVMContext::MD_tbaa); + AliasSet *AS = findAliasSetForPointer(LI->getOperand(0), Size, TBAAInfo); if (!AS) return false; remove(*AS); return true; } bool AliasSetTracker::remove(StoreInst *SI) { - unsigned Size = AA.getTypeStoreSize(SI->getOperand(0)->getType()); - AliasSet *AS = findAliasSetForPointer(SI->getOperand(1), Size); - if (!AS) return false; - remove(*AS); - return true; -} - -bool AliasSetTracker::remove(FreeInst *FI) { - AliasSet *AS = findAliasSetForPointer(FI->getOperand(0), ~0); + uint64_t Size = AA.getTypeStoreSize(SI->getOperand(0)->getType()); + const MDNode *TBAAInfo = SI->getMetadata(LLVMContext::MD_tbaa); + AliasSet *AS = findAliasSetForPointer(SI->getOperand(1), Size, TBAAInfo); if (!AS) return false; remove(*AS); return true; } bool AliasSetTracker::remove(VAArgInst *VAAI) { - AliasSet *AS = findAliasSetForPointer(VAAI->getOperand(0), ~0); + AliasSet *AS = findAliasSetForPointer(VAAI->getOperand(0), + AliasAnalysis::UnknownSize, + VAAI->getMetadata(LLVMContext::MD_tbaa)); if (!AS) return false; remove(*AS); return true; @@ -456,13 +467,11 @@ bool AliasSetTracker::remove(Instruction *I) { // Dispatch to one of the other remove methods... if (LoadInst *LI = dyn_cast(I)) return remove(LI); - else if (StoreInst *SI = dyn_cast(I)) + if (StoreInst *SI = dyn_cast(I)) return remove(SI); - else if (CallInst *CI = dyn_cast(I)) + if (CallInst *CI = dyn_cast(I)) return remove(CI); - else if (FreeInst *FI = dyn_cast(I)) - return remove(FI); - else if (VAArgInst *VAAI = dyn_cast(I)) + if (VAArgInst *VAAI = dyn_cast(I)) return remove(VAAI); return true; } @@ -478,12 +487,17 @@ void AliasSetTracker::deleteValue(Value *PtrVal) { AA.deleteValue(PtrVal); // If this is a call instruction, remove the callsite from the appropriate - // AliasSet. - CallSite CS = CallSite::get(PtrVal); - if (CS.getInstruction()) - if (!AA.doesNotAccessMemory(CS)) - if (AliasSet *AS = findAliasSetForCallSite(CS)) - AS->removeCallSite(CS); + // AliasSet (if present). + if (CallSite CS = PtrVal) { + if (!AA.doesNotAccessMemory(CS)) { + // Scan all the alias sets to see if this call site is contained. + for (iterator I = begin(), E = end(); I != E; ++I) { + if (I->Forward) continue; + + I->removeCallSite(CS); + } + } + } // First, look up the PointerRec for this pointer. PointerMapType::iterator I = PointerMap.find(PtrVal); @@ -523,7 +537,9 @@ void AliasSetTracker::copyValue(Value *From, Value *To) { // Add it to the alias set it aliases... I = PointerMap.find(From); AliasSet *AS = I->second->getAliasSet(*this); - AS->addPointer(*this, Entry, I->second->getSize(), true); + AS->addPointer(*this, Entry, I->second->getSize(), + I->second->getTBAAInfo(), + true); } @@ -533,7 +549,7 @@ void AliasSetTracker::copyValue(Value *From, Value *To) { //===----------------------------------------------------------------------===// void AliasSet::print(raw_ostream &OS) const { - OS << " AliasSet[" << format("0x%p", (void*)this) << "," << RefCount << "] "; + OS << " AliasSet[" << (void*)this << ", " << RefCount << "] "; OS << (AliasTy == MustAlias ? "must" : "may") << " alias, "; switch (AccessTy) { case NoModRef: OS << "No access "; break; @@ -559,7 +575,7 @@ void AliasSet::print(raw_ostream &OS) const { OS << "\n " << CallSites.size() << " Call Sites: "; for (unsigned i = 0, e = CallSites.size(); i != e; ++i) { if (i) OS << ", "; - WriteAsOperand(OS, CallSites[i].getCalledValue()); + WriteAsOperand(OS, CallSites[i]); } } OS << "\n"; @@ -573,8 +589,8 @@ void AliasSetTracker::print(raw_ostream &OS) const { OS << "\n"; } -void AliasSet::dump() const { print(errs()); } -void AliasSetTracker::dump() const { print(errs()); } +void AliasSet::dump() const { print(dbgs()); } +void AliasSetTracker::dump() const { print(dbgs()); } //===----------------------------------------------------------------------===// // ASTCallbackVH Class Implementation @@ -603,7 +619,9 @@ namespace { AliasSetTracker *Tracker; public: static char ID; // Pass identification, replacement for typeid - AliasSetPrinter() : FunctionPass(&ID) {} + AliasSetPrinter() : FunctionPass(ID) { + initializeAliasSetPrinterPass(*PassRegistry::getPassRegistry()); + } virtual void getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesAll(); @@ -623,5 +641,8 @@ namespace { } char AliasSetPrinter::ID = 0; -static RegisterPass -X("print-alias-sets", "Alias Set Printer", false, true); +INITIALIZE_PASS_BEGIN(AliasSetPrinter, "print-alias-sets", + "Alias Set Printer", false, true) +INITIALIZE_AG_DEPENDENCY(AliasAnalysis) +INITIALIZE_PASS_END(AliasSetPrinter, "print-alias-sets", + "Alias Set Printer", false, true)