#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/Streams.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
/// mergeSetIn - Merge the specified alias set into this alias 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
}
void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry,
- unsigned Size, bool KnownMustAlias) {
+ unsigned Size, const MDNode *TBAAInfo,
+ bool KnownMustAlias) {
assert(!Entry.hasAliasSet() && "Entry already in set!");
// Check to see if we have to downgrade to _may_ alias.
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)
/// 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...
+ // 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<Value*>(Ptr), Size)
- != AliasAnalysis::NoModRef)
+ if (AA.getModRefInfo(CallSites[i],
+ AliasAnalysis::Location(Ptr, Size, TBAAInfo)) !=
+ AliasAnalysis::NoModRef)
return true;
}
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()) !=
void AliasSetTracker::clear() {
// Delete all the PointerRec entries.
- for (DenseMap<Value*, AliasSet::PointerRec*>::iterator I = PointerMap.begin(),
- E = PointerMap.end(); I != E; ++I)
+ for (PointerMapType::iterator I = PointerMap.begin(), E = PointerMap.end();
+ I != E; ++I)
I->second->eraseFromList();
PointerMap.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, *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;
}
/// 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, unsigned 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;
}
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;
}
/// getAliasSetForPointer - Return the alias set that the specified pointer
/// 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...
+ // 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, unsigned Size, const MDNode *TBAAInfo) {
bool NewPtr;
- addPointer(Ptr, Size, AliasSet::NoModRef, NewPtr);
+ addPointer(Ptr, Size, TBAAInfo, AliasSet::NoModRef, NewPtr);
return NewPtr;
}
bool AliasSetTracker::add(LoadInst *LI) {
bool NewPtr;
AliasSet &AS = addPointer(LI->getOperand(0),
- AA.getTargetData().getTypeStoreSize(LI->getType()),
+ AA.getTypeStoreSize(LI->getType()),
+ LI->getMetadata(LLVMContext::MD_tbaa),
AliasSet::Refs, NewPtr);
if (LI->isVolatile()) AS.setVolatile();
return NewPtr;
bool NewPtr;
Value *Val = SI->getOperand(0);
AliasSet &AS = addPointer(SI->getOperand(1),
- AA.getTargetData().getTypeStoreSize(Val->getType()),
+ 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;
}
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<LoadInst>(I))
return add(LI);
- else if (StoreInst *SI = dyn_cast<StoreInst>(I))
+ if (StoreInst *SI = dyn_cast<StoreInst>(I))
return add(SI);
- else if (CallInst *CI = dyn_cast<CallInst>(I))
+ if (CallInst *CI = dyn_cast<CallInst>(I))
return add(CI);
- else if (InvokeInst *II = dyn_cast<InvokeInst>(I))
+ if (InvokeInst *II = dyn_cast<InvokeInst>(I))
return add(II);
- else if (FreeInst *FI = dyn_cast<FreeInst>(I))
- return add(FI);
- else if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
+ if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
return add(VAAI);
return true;
}
// 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();
- 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<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
AS.removeFromTracker(*this);
}
-bool AliasSetTracker::remove(Value *Ptr, unsigned Size) {
- AliasSet *AS = findAliasSetForPointer(Ptr, Size);
+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.getTargetData().getTypeStoreSize(LI->getType());
- AliasSet *AS = findAliasSetForPointer(LI->getOperand(0), Size);
+ 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.getTargetData().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);
+ 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), ~0);
+ AliasSet *AS = findAliasSetForPointer(VAAI->getOperand(0),
+ AliasAnalysis::UnknownSize,
+ VAAI->getMetadata(LLVMContext::MD_tbaa));
if (!AS) return false;
remove(*AS);
return true;
// Dispatch to one of the other remove methods...
if (LoadInst *LI = dyn_cast<LoadInst>(I))
return remove(LI);
- else if (StoreInst *SI = dyn_cast<StoreInst>(I))
+ if (StoreInst *SI = dyn_cast<StoreInst>(I))
return remove(SI);
- else if (CallInst *CI = dyn_cast<CallInst>(I))
+ if (CallInst *CI = dyn_cast<CallInst>(I))
return remove(CI);
- else if (FreeInst *FI = dyn_cast<FreeInst>(I))
- return remove(FI);
- else if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
+ if (VAArgInst *VAAI = dyn_cast<VAArgInst>(I))
return remove(VAAI);
return true;
}
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.
- DenseMap<Value*, AliasSet::PointerRec*>::iterator I = PointerMap.find(PtrVal);
+ 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.
AA.copyValue(From, To);
// First, look up the PointerRec for this pointer.
- DenseMap<Value*, AliasSet::PointerRec*>::iterator I = PointerMap.find(From);
+ PointerMapType::iterator I = PointerMap.find(From);
if (I == PointerMap.end())
return; // Noop
assert(I->second->hasAliasSet() && "Dead entry?");
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(), true);
+ 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 << "] ";
+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 << "\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 (cerr); }
-void AliasSetTracker::dump() const { print(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
//===----------------------------------------------------------------------===//
namespace {
- class VISIBILITY_HIDDEN AliasSetPrinter : public FunctionPass {
+ class AliasSetPrinter : public FunctionPass {
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();
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
Tracker->add(&*I);
- Tracker->print(cerr);
+ Tracker->print(errs());
delete Tracker;
return false;
}
}
char AliasSetPrinter::ID = 0;
-static RegisterPass<AliasSetPrinter>
-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)
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