//===- AliasSetTracker.cpp - Alias Sets Tracker implementation-------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file implements the AliasSetTracker and AliasSet classes.
-//
+//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/AliasSetTracker.h"
#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/iMemory.h"
-#include "llvm/iOther.h"
-#include "llvm/iTerminators.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/InstIterator.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Type.h"
#include "llvm/Pass.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Assembly/Writer.h"
-#include "llvm/Support/InstIterator.h"
-
-namespace llvm {
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
-/// mergeSetIn - Merge the specified alias set into this alias set...
+/// mergeSetIn - Merge the specified alias set into this alias set.
///
-void AliasSet::mergeSetIn(AliasSet &AS) {
+void AliasSet::mergeSetIn(AliasSet &AS, AliasSetTracker &AST) {
assert(!AS.Forward && "Alias set is already forwarding!");
assert(!Forward && "This set is a forwarding set!!");
// Update the alias and access types of this set...
- AccessTy |= AS.AccessTy;
- AliasTy |= AS.AliasTy;
-
- if (CallSites.empty()) { // Merge call sites...
- if (!AS.CallSites.empty())
- std::swap(CallSites, AS.CallSites);
- } else if (!AS.CallSites.empty()) {
- CallSites.insert(CallSites.end(), AS.CallSites.begin(), AS.CallSites.end());
- AS.CallSites.clear();
+ Access |= AS.Access;
+ Alias |= AS.Alias;
+ Volatile |= AS.Volatile;
+
+ if (Alias == SetMustAlias) {
+ // Check that these two merged sets really are must aliases. Since both
+ // used to be must-alias sets, we can just check any pointer from each set
+ // for aliasing.
+ AliasAnalysis &AA = AST.getAliasAnalysis();
+ PointerRec *L = getSomePointer();
+ PointerRec *R = AS.getSomePointer();
+
+ // If the pointers are not a must-alias pair, this set becomes a may alias.
+ if (AA.alias(MemoryLocation(L->getValue(), L->getSize(), L->getAAInfo()),
+ MemoryLocation(R->getValue(), R->getSize(), R->getAAInfo())) !=
+ MustAlias)
+ Alias = SetMayAlias;
+ }
+
+ bool ASHadUnknownInsts = !AS.UnknownInsts.empty();
+ if (UnknownInsts.empty()) { // Merge call sites...
+ if (ASHadUnknownInsts) {
+ std::swap(UnknownInsts, AS.UnknownInsts);
+ addRef();
+ }
+ } else if (ASHadUnknownInsts) {
+ UnknownInsts.insert(UnknownInsts.end(), AS.UnknownInsts.begin(), AS.UnknownInsts.end());
+ AS.UnknownInsts.clear();
}
-
- // FIXME: If AS's refcount is zero, nuke it now...
- assert(RefCount != 0);
AS.Forward = this; // Forward across AS now...
- RefCount++; // AS is now pointing to us...
+ addRef(); // AS is now pointing to us...
// Merge the list of constituent pointers...
- PtrListTail->second.setTail(AS.PtrListHead);
- PtrListTail = AS.PtrListTail;
- AS.PtrListHead = AS.PtrListTail = 0;
+ if (AS.PtrList) {
+ *PtrListEnd = AS.PtrList;
+ AS.PtrList->setPrevInList(PtrListEnd);
+ PtrListEnd = AS.PtrListEnd;
+
+ AS.PtrList = nullptr;
+ AS.PtrListEnd = &AS.PtrList;
+ assert(*AS.PtrListEnd == nullptr && "End of list is not null?");
+ }
+ if (ASHadUnknownInsts)
+ AS.dropRef(AST);
}
void AliasSetTracker::removeAliasSet(AliasSet *AS) {
+ if (AliasSet *Fwd = AS->Forward) {
+ Fwd->dropRef(*this);
+ AS->Forward = nullptr;
+ }
AliasSets.erase(AS);
}
AST.removeAliasSet(this);
}
-void AliasSet::addPointer(AliasSetTracker &AST, HashNodePair &Entry,
- unsigned Size) {
- assert(!Entry.second.hasAliasSet() && "Entry already in set!");
-
- AliasAnalysis &AA = AST.getAliasAnalysis();
-
- if (isMustAlias()) // Check to see if we have to downgrade to _may_ alias
- if (HashNodePair *P = getSomePointer()) {
- AliasAnalysis::AliasResult Result =
- AA.alias(P->first, P->second.getSize(), Entry.first, Size);
- if (Result == AliasAnalysis::MayAlias)
- AliasTy = MayAlias;
+void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry,
+ uint64_t Size, const AAMDNodes &AAInfo,
+ bool KnownMustAlias) {
+ assert(!Entry.hasAliasSet() && "Entry already in set!");
+
+ // Check to see if we have to downgrade to _may_ alias.
+ if (isMustAlias() && !KnownMustAlias)
+ if (PointerRec *P = getSomePointer()) {
+ AliasAnalysis &AA = AST.getAliasAnalysis();
+ AliasResult Result =
+ AA.alias(MemoryLocation(P->getValue(), P->getSize(), P->getAAInfo()),
+ MemoryLocation(Entry.getValue(), Size, AAInfo));
+ if (Result != MustAlias)
+ Alias = SetMayAlias;
else // First entry of must alias must have maximum size!
- P->second.updateSize(Size);
- assert(Result != AliasAnalysis::NoAlias && "Cannot be part of must set!");
+ P->updateSizeAndAAInfo(Size, AAInfo);
+ assert(Result != NoAlias && "Cannot be part of must set!");
}
- Entry.second.setAliasSet(this);
- Entry.second.updateSize(Size);
+ Entry.setAliasSet(this);
+ Entry.updateSizeAndAAInfo(Size, AAInfo);
// Add it to the end of the list...
- if (PtrListTail)
- PtrListTail->second.setTail(&Entry);
- else
- PtrListHead = &Entry;
- PtrListTail = &Entry;
- RefCount++; // Entry points to alias set...
+ assert(*PtrListEnd == nullptr && "End of list is not null?");
+ *PtrListEnd = &Entry;
+ PtrListEnd = Entry.setPrevInList(PtrListEnd);
+ assert(*PtrListEnd == nullptr && "End of list is not null?");
+ addRef(); // Entry points to alias set.
}
-void AliasSet::addCallSite(CallSite CS) {
- CallSites.push_back(CS);
- AliasTy = MayAlias; // FIXME: Too conservative?
- AccessTy = ModRef;
+void AliasSet::addUnknownInst(Instruction *I, AliasAnalysis &AA) {
+ if (UnknownInsts.empty())
+ addRef();
+ UnknownInsts.emplace_back(I);
+
+ if (!I->mayWriteToMemory()) {
+ Alias = SetMayAlias;
+ Access |= RefAccess;
+ return;
+ }
+
+ // FIXME: This should use mod/ref information to make this not suck so bad
+ Alias = SetMayAlias;
+ Access = ModRefAccess;
}
/// 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 AAMDNodes &AAInfo,
AliasAnalysis &AA) const {
- if (AliasTy == MustAlias) {
- assert(CallSites.empty() && "Illegal must alias set!");
+ if (Alias == SetMustAlias) {
+ assert(UnknownInsts.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...
- HashNodePair *SomePtr = getSomePointer();
+ // SOME value in the set.
+ PointerRec *SomePtr = getSomePointer();
assert(SomePtr && "Empty must-alias set??");
- return AA.alias(SomePtr->first, SomePtr->second.getSize(), Ptr, Size);
+ return AA.alias(MemoryLocation(SomePtr->getValue(), SomePtr->getSize(),
+ SomePtr->getAAInfo()),
+ MemoryLocation(Ptr, Size, AAInfo));
}
// 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->first, I->second.getSize()))
+ if (AA.alias(MemoryLocation(Ptr, Size, AAInfo),
+ MemoryLocation(I.getPointer(), I.getSize(), I.getAAInfo())))
+ return true;
+
+ // Check the unknown instructions...
+ if (!UnknownInsts.empty()) {
+ for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i)
+ if (AA.getModRefInfo(UnknownInsts[i],
+ MemoryLocation(Ptr, Size, AAInfo)) != MRI_NoModRef)
+ return true;
+ }
+
+ return false;
+}
+
+bool AliasSet::aliasesUnknownInst(const Instruction *Inst,
+ AliasAnalysis &AA) const {
+ if (!Inst->mayReadOrWriteMemory())
+ return false;
+
+ for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i) {
+ ImmutableCallSite C1(getUnknownInst(i)), C2(Inst);
+ if (!C1 || !C2 || AA.getModRefInfo(C1, C2) != MRI_NoModRef ||
+ AA.getModRefInfo(C2, C1) != MRI_NoModRef)
return true;
+ }
- // Check the call sites list and invoke list...
- if (!CallSites.empty())
- // FIXME: this is pessimistic!
- return true;
+ for (iterator I = begin(), E = end(); I != E; ++I)
+ if (AA.getModRefInfo(Inst, MemoryLocation(I.getPointer(), I.getSize(),
+ I.getAAInfo())) != MRI_NoModRef)
+ return true;
return false;
}
-bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
- // FIXME: Too conservative!
- return true;
+void AliasSetTracker::clear() {
+ // Delete all the PointerRec entries.
+ for (PointerMapType::iterator I = PointerMap.begin(), E = PointerMap.end();
+ I != E; ++I)
+ I->second->eraseFromList();
+
+ PointerMap.clear();
+
+ // The alias sets should all be clear now.
+ AliasSets.clear();
}
/// that may alias the pointer, merge them together and return the unified set.
///
AliasSet *AliasSetTracker::findAliasSetForPointer(const Value *Ptr,
- unsigned Size) {
- 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); // Merge in contents...
- }
+ uint64_t Size,
+ const AAMDNodes &AAInfo) {
+ AliasSet *FoundSet = nullptr;
+ for (iterator I = begin(), E = end(); I != E;) {
+ iterator Cur = I++;
+ if (Cur->Forward || !Cur->aliasesPointer(Ptr, Size, AAInfo, AA)) continue;
+
+ if (!FoundSet) { // If this is the first alias set ptr can go into.
+ FoundSet = &*Cur; // Remember it.
+ } else { // Otherwise, we must merge the sets.
+ FoundSet->mergeSetIn(*Cur, *this); // Merge in contents.
}
+ }
return FoundSet;
}
-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); // Merge in contents...
- }
- }
+/// 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(const Value *Ptr, uint64_t Size,
+ const AAMDNodes &AAInfo) const {
+ for (const_iterator I = begin(), E = end(); I != E; ++I)
+ if (!I->Forward && I->aliasesPointer(Ptr, Size, AAInfo, AA))
+ return true;
+ return false;
+}
+
+bool AliasSetTracker::containsUnknown(const Instruction *Inst) const {
+ for (const_iterator I = begin(), E = end(); I != E; ++I)
+ if (!I->Forward && I->aliasesUnknownInst(Inst, AA))
+ return true;
+ return false;
+}
+AliasSet *AliasSetTracker::findAliasSetForUnknownInst(Instruction *Inst) {
+ AliasSet *FoundSet = nullptr;
+ for (iterator I = begin(), E = end(); I != E;) {
+ iterator Cur = I++;
+ if (Cur->Forward || !Cur->aliasesUnknownInst(Inst, AA))
+ continue;
+ if (!FoundSet) // If this is the first alias set ptr can go into.
+ FoundSet = &*Cur; // Remember it.
+ else if (!Cur->Forward) // Otherwise, we must merge the sets.
+ FoundSet->mergeSetIn(*Cur, *this); // Merge in contents.
+ }
return FoundSet;
}
/// getAliasSetForPointer - Return the alias set that the specified pointer
-/// lives in...
-AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, unsigned Size){
- AliasSet::HashNodePair &Entry = getEntryFor(Pointer);
-
- // Check to see if the pointer is already known...
- if (Entry.second.hasAliasSet() && Size <= Entry.second.getSize()) {
+/// lives in.
+AliasSet &AliasSetTracker::getAliasSetForPointer(Value *Pointer, uint64_t Size,
+ const AAMDNodes &AAInfo,
+ bool *New) {
+ AliasSet::PointerRec &Entry = getEntryFor(Pointer);
+
+ // Check to see if the pointer is already known.
+ if (Entry.hasAliasSet()) {
+ Entry.updateSizeAndAAInfo(Size, AAInfo);
// Return the set!
- return *Entry.second.getAliasSet(*this)->getForwardedTarget(*this);
- } else if (AliasSet *AS = findAliasSetForPointer(Pointer, Size)) {
- // Add it to the alias set it aliases...
- AS->addPointer(*this, Entry, Size);
+ return *Entry.getAliasSet(*this)->getForwardedTarget(*this);
+ }
+
+ if (AliasSet *AS = findAliasSetForPointer(Pointer, Size, AAInfo)) {
+ // Add it to the alias set it aliases.
+ AS->addPointer(*this, Entry, Size, AAInfo);
return *AS;
- } else {
- // Otherwise create a new alias set to hold the loaded pointer...
- AliasSets.push_back(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, AAInfo);
+ return AliasSets.back();
+}
+
+bool AliasSetTracker::add(Value *Ptr, uint64_t Size, const AAMDNodes &AAInfo) {
+ bool NewPtr;
+ addPointer(Ptr, Size, AAInfo, AliasSet::NoAccess, NewPtr);
+ return NewPtr;
}
-void AliasSetTracker::add(LoadInst *LI) {
- addPointer(LI->getOperand(0),
- AA.getTargetData().getTypeSize(LI->getType()), AliasSet::Refs);
+
+bool AliasSetTracker::add(LoadInst *LI) {
+ if (LI->getOrdering() > Monotonic) return addUnknown(LI);
+
+ AAMDNodes AAInfo;
+ LI->getAAMetadata(AAInfo);
+
+ AliasSet::AccessLattice Access = AliasSet::RefAccess;
+ bool NewPtr;
+ const DataLayout &DL = LI->getModule()->getDataLayout();
+ AliasSet &AS = addPointer(LI->getOperand(0),
+ DL.getTypeStoreSize(LI->getType()),
+ AAInfo, Access, NewPtr);
+ if (LI->isVolatile()) AS.setVolatile();
+ return NewPtr;
}
-void AliasSetTracker::add(StoreInst *SI) {
- addPointer(SI->getOperand(1),
- AA.getTargetData().getTypeSize(SI->getOperand(0)->getType()),
- AliasSet::Mods);
+bool AliasSetTracker::add(StoreInst *SI) {
+ if (SI->getOrdering() > Monotonic) return addUnknown(SI);
+
+ AAMDNodes AAInfo;
+ SI->getAAMetadata(AAInfo);
+
+ AliasSet::AccessLattice Access = AliasSet::ModAccess;
+ bool NewPtr;
+ const DataLayout &DL = SI->getModule()->getDataLayout();
+ Value *Val = SI->getOperand(0);
+ AliasSet &AS = addPointer(SI->getOperand(1),
+ DL.getTypeStoreSize(Val->getType()),
+ AAInfo, Access, NewPtr);
+ if (SI->isVolatile()) AS.setVolatile();
+ return NewPtr;
}
-void AliasSetTracker::add(CallSite CS) {
- AliasSet *AS = findAliasSetForCallSite(CS);
- if (!AS) {
- AliasSets.push_back(AliasSet());
- AS = &AliasSets.back();
+bool AliasSetTracker::add(VAArgInst *VAAI) {
+ AAMDNodes AAInfo;
+ VAAI->getAAMetadata(AAInfo);
+
+ bool NewPtr;
+ addPointer(VAAI->getOperand(0), MemoryLocation::UnknownSize, AAInfo,
+ AliasSet::ModRefAccess, NewPtr);
+ return NewPtr;
+}
+
+
+bool AliasSetTracker::addUnknown(Instruction *Inst) {
+ if (isa<DbgInfoIntrinsic>(Inst))
+ return true; // Ignore DbgInfo Intrinsics.
+ if (!Inst->mayReadOrWriteMemory())
+ return true; // doesn't alias anything
+
+ AliasSet *AS = findAliasSetForUnknownInst(Inst);
+ if (AS) {
+ AS->addUnknownInst(Inst, AA);
+ return false;
}
- AS->addCallSite(CS);
+ AliasSets.push_back(new AliasSet());
+ AS = &AliasSets.back();
+ AS->addUnknownInst(Inst, AA);
+ return true;
}
-void AliasSetTracker::add(Instruction *I) {
- // Dispatch to one of the other add methods...
+bool AliasSetTracker::add(Instruction *I) {
+ // Dispatch to one of the other add methods.
if (LoadInst *LI = dyn_cast<LoadInst>(I))
- add(LI);
- else if (StoreInst *SI = dyn_cast<StoreInst>(I))
- add(SI);
- else if (CallInst *CI = dyn_cast<CallInst>(I))
- add(CI);
- else if (InvokeInst *II = dyn_cast<InvokeInst>(I))
- add(II);
+ return add(LI);
+ if (StoreInst *SI = dyn_cast<StoreInst>(I))
+ return add(SI);
+ if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
+ return add(VAAI);
+ return addUnknown(I);
}
void AliasSetTracker::add(BasicBlock &BB) {
- for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
- add(I);
+ for (auto &I : BB)
+ add(&I);
}
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<AliasSet&>(*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();
- for (; I != E; ++I)
- addPointer(I->first, I->second.getSize(),
- (AliasSet::AccessType)AS.AccessTy);
+ for (const_iterator I = AST.begin(), E = AST.end(); I != E; ++I) {
+ if (I->Forward) continue; // Ignore forwarding alias sets
+
+ AliasSet &AS = const_cast<AliasSet&>(*I);
+
+ // If there are any call sites in the alias set, add them to this AST.
+ for (unsigned i = 0, e = AS.UnknownInsts.size(); i != e; ++i)
+ add(AS.UnknownInsts[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.getAAInfo(),
+ (AliasSet::AccessLattice)AS.Access, X);
+ if (AS.isVolatile()) NewAS.setVolatile();
+ }
+ }
+}
+
+/// remove - Remove the specified (potentially non-empty) alias set from the
+/// tracker.
+void AliasSetTracker::remove(AliasSet &AS) {
+ // Drop all call sites.
+ if (!AS.UnknownInsts.empty())
+ AS.dropRef(*this);
+ AS.UnknownInsts.clear();
+
+ // Clear the alias set.
+ unsigned NumRefs = 0;
+ while (!AS.empty()) {
+ AliasSet::PointerRec *P = AS.PtrList;
+
+ Value *ValToRemove = P->getValue();
+
+ // Unlink and delete entry from the list of values.
+ P->eraseFromList();
+
+ // Remember how many references need to be dropped.
+ ++NumRefs;
+
+ // Finally, remove the entry.
+ PointerMap.erase(ValToRemove);
+ }
+
+ // Stop using the alias set, removing it.
+ AS.RefCount -= NumRefs;
+ if (AS.RefCount == 0)
+ AS.removeFromTracker(*this);
+}
+
+bool
+AliasSetTracker::remove(Value *Ptr, uint64_t Size, const AAMDNodes &AAInfo) {
+ AliasSet *AS = findAliasSetForPointer(Ptr, Size, AAInfo);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
+
+bool AliasSetTracker::remove(LoadInst *LI) {
+ const DataLayout &DL = LI->getModule()->getDataLayout();
+ uint64_t Size = DL.getTypeStoreSize(LI->getType());
+
+ AAMDNodes AAInfo;
+ LI->getAAMetadata(AAInfo);
+
+ AliasSet *AS = findAliasSetForPointer(LI->getOperand(0), Size, AAInfo);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
+
+bool AliasSetTracker::remove(StoreInst *SI) {
+ const DataLayout &DL = SI->getModule()->getDataLayout();
+ uint64_t Size = DL.getTypeStoreSize(SI->getOperand(0)->getType());
+
+ AAMDNodes AAInfo;
+ SI->getAAMetadata(AAInfo);
+
+ AliasSet *AS = findAliasSetForPointer(SI->getOperand(1), Size, AAInfo);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
+
+bool AliasSetTracker::remove(VAArgInst *VAAI) {
+ AAMDNodes AAInfo;
+ VAAI->getAAMetadata(AAInfo);
+
+ AliasSet *AS = findAliasSetForPointer(VAAI->getOperand(0),
+ MemoryLocation::UnknownSize, AAInfo);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
+
+bool AliasSetTracker::removeUnknown(Instruction *I) {
+ if (!I->mayReadOrWriteMemory())
+ return false; // doesn't alias anything
+
+ AliasSet *AS = findAliasSetForUnknownInst(I);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
+
+bool AliasSetTracker::remove(Instruction *I) {
+ // Dispatch to one of the other remove methods...
+ if (LoadInst *LI = dyn_cast<LoadInst>(I))
+ return remove(LI);
+ if (StoreInst *SI = dyn_cast<StoreInst>(I))
+ return remove(SI);
+ if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
+ return remove(VAAI);
+ return removeUnknown(I);
+}
+
+
+// deleteValue method - This method is used to remove a pointer value from the
+// AliasSetTracker entirely. It should be used when an instruction is deleted
+// from the program to update the AST. If you don't use this, you would have
+// dangling pointers to deleted instructions.
+//
+void AliasSetTracker::deleteValue(Value *PtrVal) {
+ // If this is a call instruction, remove the callsite from the appropriate
+ // AliasSet (if present).
+ if (Instruction *Inst = dyn_cast<Instruction>(PtrVal)) {
+ if (Inst->mayReadOrWriteMemory()) {
+ // Scan all the alias sets to see if this call site is contained.
+ for (iterator I = begin(), E = end(); I != E;) {
+ iterator Cur = I++;
+ if (!Cur->Forward)
+ Cur->removeUnknownInst(*this, Inst);
+ }
}
+ }
+
+ // First, look up the PointerRec for this pointer.
+ PointerMapType::iterator I = PointerMap.find_as(PtrVal);
+ if (I == PointerMap.end()) return; // Noop
+
+ // If we found one, remove the pointer from the alias set it is in.
+ AliasSet::PointerRec *PtrValEnt = I->second;
+ AliasSet *AS = PtrValEnt->getAliasSet(*this);
+
+ // Unlink and delete from the list of values.
+ PtrValEnt->eraseFromList();
+
+ // Stop using the alias set.
+ AS->dropRef(*this);
+
+ PointerMap.erase(I);
+}
+
+// copyValue - This method should be used whenever a preexisting value in the
+// program is copied or cloned, introducing a new value. Note that it is ok for
+// clients that use this method to introduce the same value multiple times: if
+// the tracker already knows about a value, it will ignore the request.
+//
+void AliasSetTracker::copyValue(Value *From, Value *To) {
+ // First, look up the PointerRec for this pointer.
+ PointerMapType::iterator I = PointerMap.find_as(From);
+ if (I == PointerMap.end())
+ return; // Noop
+ assert(I->second->hasAliasSet() && "Dead entry?");
+
+ AliasSet::PointerRec &Entry = getEntryFor(To);
+ if (Entry.hasAliasSet()) return; // Already in the tracker!
+
+ // Add it to the alias set it aliases...
+ I = PointerMap.find_as(From);
+ AliasSet *AS = I->second->getAliasSet(*this);
+ AS->addPointer(*this, Entry, I->second->getSize(),
+ I->second->getAAInfo(),
+ true);
}
+
+
//===----------------------------------------------------------------------===//
// AliasSet/AliasSetTracker Printing Support
//===----------------------------------------------------------------------===//
-void AliasSet::print(std::ostream &OS) const {
- OS << " AliasSet[" << (void*)this << "," << RefCount << "] ";
- OS << (AliasTy == MustAlias ? "must" : "may ") << " alias, ";
- switch (AccessTy) {
- case NoModRef: OS << "No access "; break;
- case Refs : OS << "Ref "; break;
- case Mods : OS << "Mod "; break;
- case ModRef : OS << "Mod/Ref "; break;
- default: assert(0 && "Bad value for AccessTy!");
+void AliasSet::print(raw_ostream &OS) const {
+ OS << " AliasSet[" << (const void*)this << ", " << RefCount << "] ";
+ OS << (Alias == SetMustAlias ? "must" : "may") << " alias, ";
+ switch (Access) {
+ case NoAccess: OS << "No access "; break;
+ case RefAccess: OS << "Ref "; break;
+ case ModAccess: OS << "Mod "; break;
+ case ModRefAccess: OS << "Mod/Ref "; break;
+ default: llvm_unreachable("Bad value for Access!");
}
+ if (isVolatile()) OS << "[volatile] ";
if (Forward)
OS << " forwarding to " << (void*)Forward;
- if (begin() != end()) {
+ if (!empty()) {
OS << "Pointers: ";
for (iterator I = begin(), E = end(); I != E; ++I) {
if (I != begin()) OS << ", ";
- WriteAsOperand(OS << "(", I->first);
- OS << ", " << I->second.getSize() << ")";
+ I.getPointer()->printAsOperand(OS << "(");
+ OS << ", " << I.getSize() << ")";
}
}
- if (!CallSites.empty()) {
- OS << "\n " << CallSites.size() << " Call Sites: ";
- for (unsigned i = 0, e = CallSites.size(); i != e; ++i) {
+ if (!UnknownInsts.empty()) {
+ OS << "\n " << UnknownInsts.size() << " Unknown instructions: ";
+ for (unsigned i = 0, e = UnknownInsts.size(); i != e; ++i) {
if (i) OS << ", ";
- WriteAsOperand(OS, CallSites[i].getCalledValue());
- }
+ UnknownInsts[i]->printAsOperand(OS);
+ }
}
OS << "\n";
}
-void AliasSetTracker::print(std::ostream &OS) const {
+void AliasSetTracker::print(raw_ostream &OS) const {
OS << "Alias Set Tracker: " << AliasSets.size() << " alias sets for "
<< PointerMap.size() << " pointer values.\n";
for (const_iterator I = begin(), E = end(); I != E; ++I)
OS << "\n";
}
-void AliasSet::dump() const { print (std::cerr); }
-void AliasSetTracker::dump() const { print(std::cerr); }
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+void AliasSet::dump() const { print(dbgs()); }
+void AliasSetTracker::dump() const { print(dbgs()); }
+#endif
+
+//===----------------------------------------------------------------------===//
+// ASTCallbackVH Class Implementation
+//===----------------------------------------------------------------------===//
+
+void AliasSetTracker::ASTCallbackVH::deleted() {
+ assert(AST && "ASTCallbackVH called with a null AliasSetTracker!");
+ AST->deleteValue(getValPtr());
+ // this now dangles!
+}
+
+void AliasSetTracker::ASTCallbackVH::allUsesReplacedWith(Value *V) {
+ AST->copyValue(getValPtr(), V);
+}
+
+AliasSetTracker::ASTCallbackVH::ASTCallbackVH(Value *V, AliasSetTracker *ast)
+ : CallbackVH(V), AST(ast) {}
+
+AliasSetTracker::ASTCallbackVH &
+AliasSetTracker::ASTCallbackVH::operator=(Value *V) {
+ return *this = ASTCallbackVH(V, AST);
+}
//===----------------------------------------------------------------------===//
// AliasSetPrinter Pass
class AliasSetPrinter : public FunctionPass {
AliasSetTracker *Tracker;
public:
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- AU.addRequired<AliasAnalysis>();
+ static char ID; // Pass identification, replacement for typeid
+ AliasSetPrinter() : FunctionPass(ID) {
+ initializeAliasSetPrinterPass(*PassRegistry::getPassRegistry());
}
- virtual bool runOnFunction(Function &F) {
- Tracker = new AliasSetTracker(getAnalysis<AliasAnalysis>());
-
- for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
- Tracker->add(*I);
- return false;
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.setPreservesAll();
+ AU.addRequired<AAResultsWrapperPass>();
}
- /// print - Convert to human readable form
- virtual void print(std::ostream &OS) const {
- Tracker->print(OS);
- }
+ bool runOnFunction(Function &F) override {
+ auto &AAWP = getAnalysis<AAResultsWrapperPass>();
+ Tracker = new AliasSetTracker(AAWP.getAAResults());
- virtual void releaseMemory() {
+ for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
+ Tracker->add(&*I);
+ Tracker->print(errs());
delete Tracker;
+ return false;
}
};
- RegisterPass<AliasSetPrinter> X("print-alias-sets", "Alias Set Printer",
- PassInfo::Analysis | PassInfo::Optimization);
}
-} // End llvm namespace
+char AliasSetPrinter::ID = 0;
+INITIALIZE_PASS_BEGIN(AliasSetPrinter, "print-alias-sets",
+ "Alias Set Printer", false, true)
+INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
+INITIALIZE_PASS_END(AliasSetPrinter, "print-alias-sets",
+ "Alias Set Printer", false, true)
projects / oota-llvm.git / blobdiff