//===- 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/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/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/InstIterator.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;
+ Volatile |= AS.Volatile;
+
+ if (AliasTy == MustAlias) {
+ // 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(L->getValue(), L->getSize(), R->getValue(), R->getSize())
+ != AliasAnalysis::MustAlias)
+ AliasTy = MayAlias;
+ }
if (CallSites.empty()) { // Merge call sites...
if (!AS.CallSites.empty())
CallSites.insert(CallSites.end(), AS.CallSites.begin(), AS.CallSites.end());
AS.CallSites.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...
if (AS.PtrList) {
*PtrListEnd = AS.PtrList;
- AS.PtrList->second.setPrevInList(PtrListEnd);
+ AS.PtrList->setPrevInList(PtrListEnd);
PtrListEnd = AS.PtrListEnd;
AS.PtrList = 0;
AS.PtrListEnd = &AS.PtrList;
+ assert(*AS.PtrListEnd == 0 && "End of list is not null?");
}
}
void AliasSetTracker::removeAliasSet(AliasSet *AS) {
+ if (AliasSet *Fwd = AS->Forward) {
+ Fwd->dropRef(*this);
+ AS->Forward = 0;
+ }
AliasSets.erase(AS);
}
AST.removeAliasSet(this);
}
-void AliasSet::addPointer(AliasSetTracker &AST, HashNodePair &Entry,
- unsigned Size) {
- assert(!Entry.second.hasAliasSet() && "Entry already in set!");
+void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry,
+ unsigned Size, const MDNode *TBAAInfo,
+ bool KnownMustAlias) {
+ assert(!Entry.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()) {
+ // Check to see if we have to downgrade to _may_ alias.
+ if (isMustAlias() && !KnownMustAlias)
+ if (PointerRec *P = getSomePointer()) {
+ AliasAnalysis &AA = AST.getAliasAnalysis();
AliasAnalysis::AliasResult Result =
- AA.alias(P->first, P->second.getSize(), Entry.first, 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->second.updateSize(Size);
+ P->updateSizeAndTBAAInfo(Size, TBAAInfo);
assert(Result != AliasAnalysis::NoAlias && "Cannot be part of must set!");
}
- Entry.second.setAliasSet(this);
- Entry.second.updateSize(Size);
+ Entry.setAliasSet(this);
+ 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.second.setPrevInList(PtrListEnd);
- RefCount++; // Entry points to alias set...
+ PtrListEnd = Entry.setPrevInList(PtrListEnd);
+ assert(*PtrListEnd == 0 && "End of list is not null?");
+ addRef(); // Entry points to alias set.
}
void AliasSet::addCallSite(CallSite CS, AliasAnalysis &AA) {
- CallSites.push_back(CS);
-
- if (Function *F = CS.getCalledFunction()) {
- if (AA.doesNotAccessMemory(F))
- return;
- else if (AA.onlyReadsMemory(F)) {
- AliasTy = MayAlias;
- AccessTy |= Refs;
- return;
- }
+ CallSites.push_back(CS.getInstruction());
+
+ AliasAnalysis::ModRefBehavior Behavior = AA.getModRefBehavior(CS);
+ if (Behavior == AliasAnalysis::DoesNotAccessMemory)
+ return;
+ else if (Behavior == AliasAnalysis::OnlyReadsMemory) {
+ AliasTy = MayAlias;
+ AccessTy |= Refs;
+ return;
}
// FIXME: This should use mod/ref information to make this not suck so bad
/// alias one of the members in the set.
///
bool AliasSet::aliasesPointer(const Value *Ptr, unsigned 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...
- 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(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->first, I->second.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())
- // FIXME: this is pessimistic!
- return true;
+ if (!CallSites.empty()) {
+ for (unsigned i = 0, e = CallSites.size(); i != e; ++i)
+ if (AA.getModRefInfo(CallSites[i],
+ AliasAnalysis::Location(Ptr, Size, TBAAInfo)) !=
+ AliasAnalysis::NoModRef)
+ return true;
+ }
return false;
}
bool AliasSet::aliasesCallSite(CallSite CS, AliasAnalysis &AA) const {
- // FIXME: Use mod/ref information to prune this better!
- if (Function *F = CS.getCalledFunction())
- if (AA.doesNotAccessMemory(F))
- return false;
+ if (AA.doesNotAccessMemory(CS))
+ return false;
- return true;
+ 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()) !=
+ AliasAnalysis::NoModRef)
+ return true;
+
+ return false;
+}
+
+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) {
+ unsigned 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); // 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;
}
+/// 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 MDNode *TBAAInfo) const {
+ for (const_iterator I = begin(), E = end(); I != E; ++I)
+ if (!I->Forward && I->aliasesPointer(Ptr, Size, TBAAInfo, AA))
+ return true;
+ return false;
+}
+
+
+
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...
- }
- }
-
+ 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;
}
/// 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, unsigned Size,
+ const MDNode *TBAAInfo,
+ bool *New) {
+ AliasSet::PointerRec &Entry = getEntryFor(Pointer);
+
+ // Check to see if the pointer is already known.
+ if (Entry.hasAliasSet()) {
+ Entry.updateSizeAndTBAAInfo(Size, TBAAInfo);
// 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, TBAAInfo)) {
+ // Add it to the alias set it aliases.
+ AS->addPointer(*this, Entry, Size, TBAAInfo);
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, TBAAInfo);
+ return AliasSets.back();
+}
+
+bool AliasSetTracker::add(Value *Ptr, unsigned Size, const MDNode *TBAAInfo) {
+ bool NewPtr;
+ addPointer(Ptr, Size, TBAAInfo, AliasSet::NoModRef, NewPtr);
+ return NewPtr;
}
-void AliasSetTracker::add(LoadInst *LI) {
- AliasSet &AS =
- addPointer(LI->getOperand(0),
- AA.getTargetData().getTypeSize(LI->getType()), AliasSet::Refs);
+
+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;
}
-void AliasSetTracker::add(StoreInst *SI) {
- AliasSet &AS =
- addPointer(SI->getOperand(1),
- AA.getTargetData().getTypeSize(SI->getOperand(0)->getType()),
- AliasSet::Mods);
+bool AliasSetTracker::add(StoreInst *SI) {
+ bool NewPtr;
+ 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(VAArgInst *VAAI) {
+ bool NewPtr;
+ addPointer(VAAI->getOperand(0), AliasAnalysis::UnknownSize,
+ VAAI->getMetadata(LLVMContext::MD_tbaa),
+ AliasSet::ModRef, NewPtr);
+ return NewPtr;
}
-void AliasSetTracker::add(CallSite CS) {
- if (Function *F = CS.getCalledFunction())
- if (AA.doesNotAccessMemory(F))
- return;
+bool AliasSetTracker::add(CallSite CS) {
+ if (isa<DbgInfoIntrinsic>(CS.getInstruction()))
+ return true; // Ignore DbgInfo Intrinsics.
+ if (AA.doesNotAccessMemory(CS))
+ return true; // doesn't alias anything
AliasSet *AS = findAliasSetForCallSite(CS);
- if (!AS) {
- AliasSets.push_back(AliasSet());
- AS = &AliasSets.back();
+ if (AS) {
+ AS->addCallSite(CS, AA);
+ return false;
}
- AS->addCallSite(CS, AA);
+ AliasSets.push_back(new AliasSet());
+ AS = &AliasSets.back();
+ AS->addCallSite(CS, 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 (CallInst *CI = dyn_cast<CallInst>(I))
+ return add(CI);
+ if (InvokeInst *II = dyn_cast<InvokeInst>(I))
+ return add(II);
+ if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
+ return add(VAAI);
+ return true;
}
void AliasSetTracker::add(BasicBlock &BB) {
// 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.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
+/// tracker.
+void AliasSetTracker::remove(AliasSet &AS) {
+ // Drop all call sites.
+ AS.CallSites.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, unsigned 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());
+ 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());
+ 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),
+ AliasAnalysis::UnknownSize,
+ VAAI->getMetadata(LLVMContext::MD_tbaa));
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
+
+bool AliasSetTracker::remove(CallSite CS) {
+ if (AA.doesNotAccessMemory(CS))
+ return false; // doesn't alias anything
+
+ AliasSet *AS = findAliasSetForCallSite(CS);
+ if (!AS) return false;
+ remove(*AS);
+ return true;
+}
-// remove method - This method is used to remove a pointer value from the
+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 (CallInst *CI = dyn_cast<CallInst>(I))
+ return remove(CI);
+ if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
+ return remove(VAAI);
+ return true;
+}
+
+
+// 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::remove(Value *PtrVal) {
- // First, look up the PointerRec for this pointer...
- hash_map<Value*, AliasSet::PointerRec>::iterator I = PointerMap.find(PtrVal);
+void AliasSetTracker::deleteValue(Value *PtrVal) {
+ // Notify the alias analysis implementation that this value is gone.
+ AA.deleteValue(PtrVal);
+
+ // If this is a call instruction, remove the callsite from the appropriate
+ // 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);
if (I == PointerMap.end()) return; // Noop
// If we found one, remove the pointer from the alias set it is in.
- AliasSet::HashNodePair &PtrValEnt = *I;
- AliasSet *AS = PtrValEnt.second.getAliasSet(*this);
-
- // Unlink from the list of values...
- PtrValEnt.second.removeFromList();
- // Stop using the alias set
- if (--AS->RefCount == 0)
- AS->removeFromTracker(*this);
+ 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) {
+ // Notify the alias analysis implementation that this value is copied.
+ AA.copyValue(From, To);
+
+ // First, look up the PointerRec for this pointer.
+ PointerMapType::iterator I = PointerMap.find(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(From);
+ AliasSet *AS = I->second->getAliasSet(*this);
+ AS->addPointer(*this, Entry, I->second->getSize(),
+ I->second->getTBAAInfo(),
+ true);
+}
+
+
//===----------------------------------------------------------------------===//
// AliasSet/AliasSetTracker Printing Support
//===----------------------------------------------------------------------===//
-void AliasSet::print(std::ostream &OS) const {
- OS << " AliasSet[" << (void*)this << "," << RefCount << "] ";
- OS << (AliasTy == MustAlias ? "must" : "may ") << " alias, ";
+void AliasSet::print(raw_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!");
+ default: llvm_unreachable("Bad value for AccessTy!");
}
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() << ")";
+ WriteAsOperand(OS << "(", I.getPointer());
+ OS << ", " << I.getSize() << ")";
}
}
if (!CallSites.empty()) {
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";
}
-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); }
+void AliasSet::dump() const { print(dbgs()); }
+void AliasSetTracker::dump() const { print(dbgs()); }
+
+//===----------------------------------------------------------------------===//
+// ASTCallbackVH Class Implementation
+//===----------------------------------------------------------------------===//
+
+void AliasSetTracker::ASTCallbackVH::deleted() {
+ assert(AST && "ASTCallbackVH called with a null AliasSetTracker!");
+ AST->deleteValue(getValPtr());
+ // this now dangles!
+}
+
+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:
+ static char ID; // Pass identification, replacement for typeid
+ AliasSetPrinter() : FunctionPass(ID) {
+ initializeAliasSetPrinterPass(*PassRegistry::getPassRegistry());
+ }
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<AliasAnalysis>();
Tracker = new AliasSetTracker(getAnalysis<AliasAnalysis>());
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
- Tracker->add(*I);
- return false;
- }
-
- /// print - Convert to human readable form
- virtual void print(std::ostream &OS) const {
- Tracker->print(OS);
- }
-
- virtual void releaseMemory() {
+ Tracker->add(&*I);
+ Tracker->print(errs());
delete Tracker;
+ return false;
}
};
- RegisterPass<AliasSetPrinter> X("print-alias-sets", "Alias Set Printer",
- PassInfo::Analysis | PassInfo::Optimization);
}
+
+char AliasSetPrinter::ID = 0;
+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)
projects / oota-llvm.git / blobdiff