//===----------------------------------------------------------------------===//
#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/CFG.h"
+#include "llvm/Analysis/CaptureTracking.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Type.h"
#include "llvm/Pass.h"
-#include "llvm/BasicBlock.h"
-#include "llvm/Function.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Instructions.h"
-#include "llvm/Type.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLibraryInfo.h"
using namespace llvm;
// Register the AliasAnalysis interface, providing a nice name to refer to.
-static RegisterAnalysisGroup<AliasAnalysis> Z("Alias Analysis");
+INITIALIZE_ANALYSIS_GROUP(AliasAnalysis, "Alias Analysis", NoAA)
char AliasAnalysis::ID = 0;
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
AliasAnalysis::AliasResult
-AliasAnalysis::alias(const Value *V1, unsigned V1Size,
- const Value *V2, unsigned V2Size) {
+AliasAnalysis::alias(const Location &LocA, const Location &LocB) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- return AA->alias(V1, V1Size, V2, V2Size);
+ return AA->alias(LocA, LocB);
}
-void AliasAnalysis::getMustAliases(Value *P, std::vector<Value*> &RetVals) {
+bool AliasAnalysis::pointsToConstantMemory(const Location &Loc,
+ bool OrLocal) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- return AA->getMustAliases(P, RetVals);
+ return AA->pointsToConstantMemory(Loc, OrLocal);
}
-bool AliasAnalysis::pointsToConstantMemory(const Value *P) {
+AliasAnalysis::Location
+AliasAnalysis::getArgLocation(ImmutableCallSite CS, unsigned ArgIdx,
+ AliasAnalysis::ModRefResult &Mask) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- return AA->pointsToConstantMemory(P);
+ return AA->getArgLocation(CS, ArgIdx, Mask);
}
-AliasAnalysis::ModRefBehavior
-AliasAnalysis::getModRefBehavior(Function *F, CallSite CS,
- std::vector<PointerAccessInfo> *Info) {
+void AliasAnalysis::deleteValue(Value *V) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- return AA->getModRefBehavior(F, CS, Info);
+ AA->deleteValue(V);
}
-bool AliasAnalysis::hasNoModRefInfoForCalls() const {
+void AliasAnalysis::copyValue(Value *From, Value *To) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- return AA->hasNoModRefInfoForCalls();
+ AA->copyValue(From, To);
}
-void AliasAnalysis::deleteValue(Value *V) {
+void AliasAnalysis::addEscapingUse(Use &U) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- AA->deleteValue(V);
+ AA->addEscapingUse(U);
}
-void AliasAnalysis::copyValue(Value *From, Value *To) {
+
+AliasAnalysis::ModRefResult
+AliasAnalysis::getModRefInfo(ImmutableCallSite CS,
+ const Location &Loc) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- AA->copyValue(From, To);
+
+ ModRefBehavior MRB = getModRefBehavior(CS);
+ if (MRB == DoesNotAccessMemory)
+ return NoModRef;
+
+ ModRefResult Mask = ModRef;
+ if (onlyReadsMemory(MRB))
+ Mask = Ref;
+
+ if (onlyAccessesArgPointees(MRB)) {
+ bool doesAlias = false;
+ ModRefResult AllArgsMask = NoModRef;
+ if (doesAccessArgPointees(MRB)) {
+ for (ImmutableCallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
+ AI != AE; ++AI) {
+ const Value *Arg = *AI;
+ if (!Arg->getType()->isPointerTy())
+ continue;
+ ModRefResult ArgMask;
+ Location CSLoc =
+ getArgLocation(CS, (unsigned) std::distance(CS.arg_begin(), AI),
+ ArgMask);
+ if (!isNoAlias(CSLoc, Loc)) {
+ doesAlias = true;
+ AllArgsMask = ModRefResult(AllArgsMask | ArgMask);
+ }
+ }
+ }
+ if (!doesAlias)
+ return NoModRef;
+ Mask = ModRefResult(Mask & AllArgsMask);
+ }
+
+ // If Loc is a constant memory location, the call definitely could not
+ // modify the memory location.
+ if ((Mask & Mod) && pointsToConstantMemory(Loc))
+ Mask = ModRefResult(Mask & ~Mod);
+
+ // If this is the end of the chain, don't forward.
+ if (!AA) return Mask;
+
+ // Otherwise, fall back to the next AA in the chain. But we can merge
+ // in any mask we've managed to compute.
+ return ModRefResult(AA->getModRefInfo(CS, Loc) & Mask);
}
AliasAnalysis::ModRefResult
-AliasAnalysis::getModRefInfo(CallSite CS1, CallSite CS2) {
- // FIXME: we can do better.
+AliasAnalysis::getModRefInfo(ImmutableCallSite CS1, ImmutableCallSite CS2) {
+ assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
+
+ // If CS1 or CS2 are readnone, they don't interact.
+ ModRefBehavior CS1B = getModRefBehavior(CS1);
+ if (CS1B == DoesNotAccessMemory) return NoModRef;
+
+ ModRefBehavior CS2B = getModRefBehavior(CS2);
+ if (CS2B == DoesNotAccessMemory) return NoModRef;
+
+ // If they both only read from memory, there is no dependence.
+ if (onlyReadsMemory(CS1B) && onlyReadsMemory(CS2B))
+ return NoModRef;
+
+ AliasAnalysis::ModRefResult Mask = ModRef;
+
+ // If CS1 only reads memory, the only dependence on CS2 can be
+ // from CS1 reading memory written by CS2.
+ if (onlyReadsMemory(CS1B))
+ Mask = ModRefResult(Mask & Ref);
+
+ // If CS2 only access memory through arguments, accumulate the mod/ref
+ // information from CS1's references to the memory referenced by
+ // CS2's arguments.
+ if (onlyAccessesArgPointees(CS2B)) {
+ AliasAnalysis::ModRefResult R = NoModRef;
+ if (doesAccessArgPointees(CS2B)) {
+ for (ImmutableCallSite::arg_iterator
+ I = CS2.arg_begin(), E = CS2.arg_end(); I != E; ++I) {
+ const Value *Arg = *I;
+ if (!Arg->getType()->isPointerTy())
+ continue;
+ ModRefResult ArgMask;
+ Location CS2Loc =
+ getArgLocation(CS2, (unsigned) std::distance(CS2.arg_begin(), I),
+ ArgMask);
+ // ArgMask indicates what CS2 might do to CS2Loc, and the dependence of
+ // CS1 on that location is the inverse.
+ if (ArgMask == Mod)
+ ArgMask = ModRef;
+ else if (ArgMask == Ref)
+ ArgMask = Mod;
+
+ R = ModRefResult((R | (getModRefInfo(CS1, CS2Loc) & ArgMask)) & Mask);
+ if (R == Mask)
+ break;
+ }
+ }
+ return R;
+ }
+
+ // If CS1 only accesses memory through arguments, check if CS2 references
+ // any of the memory referenced by CS1's arguments. If not, return NoModRef.
+ if (onlyAccessesArgPointees(CS1B)) {
+ AliasAnalysis::ModRefResult R = NoModRef;
+ if (doesAccessArgPointees(CS1B)) {
+ for (ImmutableCallSite::arg_iterator
+ I = CS1.arg_begin(), E = CS1.arg_end(); I != E; ++I) {
+ const Value *Arg = *I;
+ if (!Arg->getType()->isPointerTy())
+ continue;
+ ModRefResult ArgMask;
+ Location CS1Loc = getArgLocation(
+ CS1, (unsigned)std::distance(CS1.arg_begin(), I), ArgMask);
+ // ArgMask indicates what CS1 might do to CS1Loc; if CS1 might Mod
+ // CS1Loc, then we care about either a Mod or a Ref by CS2. If CS1
+ // might Ref, then we care only about a Mod by CS2.
+ ModRefResult ArgR = getModRefInfo(CS2, CS1Loc);
+ if (((ArgMask & Mod) != NoModRef && (ArgR & ModRef) != NoModRef) ||
+ ((ArgMask & Ref) != NoModRef && (ArgR & Mod) != NoModRef))
+ R = ModRefResult((R | ArgMask) & Mask);
+
+ if (R == Mask)
+ break;
+ }
+ }
+ return R;
+ }
+
+ // If this is the end of the chain, don't forward.
+ if (!AA) return Mask;
+
+ // Otherwise, fall back to the next AA in the chain. But we can merge
+ // in any mask we've managed to compute.
+ return ModRefResult(AA->getModRefInfo(CS1, CS2) & Mask);
+}
+
+AliasAnalysis::ModRefBehavior
+AliasAnalysis::getModRefBehavior(ImmutableCallSite CS) {
assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
- return AA->getModRefInfo(CS1, CS2);
+
+ ModRefBehavior Min = UnknownModRefBehavior;
+
+ // Call back into the alias analysis with the other form of getModRefBehavior
+ // to see if it can give a better response.
+ if (const Function *F = CS.getCalledFunction())
+ Min = getModRefBehavior(F);
+
+ // If this is the end of the chain, don't forward.
+ if (!AA) return Min;
+
+ // Otherwise, fall back to the next AA in the chain. But we can merge
+ // in any result we've managed to compute.
+ return ModRefBehavior(AA->getModRefBehavior(CS) & Min);
}
+AliasAnalysis::ModRefBehavior
+AliasAnalysis::getModRefBehavior(const Function *F) {
+ assert(AA && "AA didn't call InitializeAliasAnalysis in its run method!");
+ return AA->getModRefBehavior(F);
+}
//===----------------------------------------------------------------------===//
// AliasAnalysis non-virtual helper method implementation
//===----------------------------------------------------------------------===//
+AliasAnalysis::Location AliasAnalysis::getLocation(const LoadInst *LI) {
+ AAMDNodes AATags;
+ LI->getAAMetadata(AATags);
+
+ return Location(LI->getPointerOperand(),
+ getTypeStoreSize(LI->getType()), AATags);
+}
+
+AliasAnalysis::Location AliasAnalysis::getLocation(const StoreInst *SI) {
+ AAMDNodes AATags;
+ SI->getAAMetadata(AATags);
+
+ return Location(SI->getPointerOperand(),
+ getTypeStoreSize(SI->getValueOperand()->getType()), AATags);
+}
+
+AliasAnalysis::Location AliasAnalysis::getLocation(const VAArgInst *VI) {
+ AAMDNodes AATags;
+ VI->getAAMetadata(AATags);
+
+ return Location(VI->getPointerOperand(), UnknownSize, AATags);
+}
+
+AliasAnalysis::Location
+AliasAnalysis::getLocation(const AtomicCmpXchgInst *CXI) {
+ AAMDNodes AATags;
+ CXI->getAAMetadata(AATags);
+
+ return Location(CXI->getPointerOperand(),
+ getTypeStoreSize(CXI->getCompareOperand()->getType()),
+ AATags);
+}
+
+AliasAnalysis::Location
+AliasAnalysis::getLocation(const AtomicRMWInst *RMWI) {
+ AAMDNodes AATags;
+ RMWI->getAAMetadata(AATags);
+
+ return Location(RMWI->getPointerOperand(),
+ getTypeStoreSize(RMWI->getValOperand()->getType()), AATags);
+}
+
+AliasAnalysis::Location
+AliasAnalysis::getLocationForSource(const MemTransferInst *MTI) {
+ uint64_t Size = UnknownSize;
+ if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
+ Size = C->getValue().getZExtValue();
+
+ // memcpy/memmove can have AA tags. For memcpy, they apply
+ // to both the source and the destination.
+ AAMDNodes AATags;
+ MTI->getAAMetadata(AATags);
+
+ return Location(MTI->getRawSource(), Size, AATags);
+}
+
+AliasAnalysis::Location
+AliasAnalysis::getLocationForDest(const MemIntrinsic *MTI) {
+ uint64_t Size = UnknownSize;
+ if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
+ Size = C->getValue().getZExtValue();
+
+ // memcpy/memmove can have AA tags. For memcpy, they apply
+ // to both the source and the destination.
+ AAMDNodes AATags;
+ MTI->getAAMetadata(AATags);
+
+ return Location(MTI->getRawDest(), Size, AATags);
+}
+
+
+
AliasAnalysis::ModRefResult
-AliasAnalysis::getModRefInfo(LoadInst *L, Value *P, unsigned Size) {
- return alias(L->getOperand(0), TD->getTypeStoreSize(L->getType()),
- P, Size) ? Ref : NoModRef;
+AliasAnalysis::getModRefInfo(const LoadInst *L, const Location &Loc) {
+ // Be conservative in the face of volatile/atomic.
+ if (!L->isUnordered())
+ return ModRef;
+
+ // If the load address doesn't alias the given address, it doesn't read
+ // or write the specified memory.
+ if (!alias(getLocation(L), Loc))
+ return NoModRef;
+
+ // Otherwise, a load just reads.
+ return Ref;
}
AliasAnalysis::ModRefResult
-AliasAnalysis::getModRefInfo(StoreInst *S, Value *P, unsigned Size) {
- // If the stored address cannot alias the pointer in question, then the
- // pointer cannot be modified by the store.
- if (!alias(S->getOperand(1),
- TD->getTypeStoreSize(S->getOperand(0)->getType()), P, Size))
+AliasAnalysis::getModRefInfo(const StoreInst *S, const Location &Loc) {
+ // Be conservative in the face of volatile/atomic.
+ if (!S->isUnordered())
+ return ModRef;
+
+ // If the store address cannot alias the pointer in question, then the
+ // specified memory cannot be modified by the store.
+ if (!alias(getLocation(S), Loc))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have been
// modified by this store.
- return pointsToConstantMemory(P) ? NoModRef : Mod;
-}
+ if (pointsToConstantMemory(Loc))
+ return NoModRef;
-AliasAnalysis::ModRefBehavior
-AliasAnalysis::getModRefBehavior(CallSite CS,
- std::vector<PointerAccessInfo> *Info) {
- if (IntrinsicInst* II = dyn_cast<IntrinsicInst>(CS.getInstruction())) {
- switch (II->getIntrinsicID()) {
- case Intrinsic::atomic_cmp_swap:
- case Intrinsic::atomic_load_add:
- case Intrinsic::atomic_load_and:
- case Intrinsic::atomic_load_max:
- case Intrinsic::atomic_load_min:
- case Intrinsic::atomic_load_nand:
- case Intrinsic::atomic_load_or:
- case Intrinsic::atomic_load_sub:
- case Intrinsic::atomic_load_umax:
- case Intrinsic::atomic_load_umin:
- case Intrinsic::atomic_load_xor:
- case Intrinsic::atomic_swap:
- // CAS and related intrinsics only access their arguments.
- return AliasAnalysis::AccessesArguments;
- default:
- break;
- }
- }
-
- if (CS.doesNotAccessMemory())
- // Can't do better than this.
- return DoesNotAccessMemory;
- ModRefBehavior MRB = UnknownModRefBehavior;
- if (Function *F = CS.getCalledFunction())
- MRB = getModRefBehavior(F, CS, Info);
- if (MRB != DoesNotAccessMemory && CS.onlyReadsMemory())
- return OnlyReadsMemory;
- return MRB;
+ // Otherwise, a store just writes.
+ return Mod;
}
-AliasAnalysis::ModRefBehavior
-AliasAnalysis::getModRefBehavior(Function *F,
- std::vector<PointerAccessInfo> *Info) {
- if (F->isIntrinsic()) {
- switch (F->getIntrinsicID()) {
- case Intrinsic::atomic_cmp_swap:
- case Intrinsic::atomic_load_add:
- case Intrinsic::atomic_load_and:
- case Intrinsic::atomic_load_max:
- case Intrinsic::atomic_load_min:
- case Intrinsic::atomic_load_nand:
- case Intrinsic::atomic_load_or:
- case Intrinsic::atomic_load_sub:
- case Intrinsic::atomic_load_umax:
- case Intrinsic::atomic_load_umin:
- case Intrinsic::atomic_load_xor:
- case Intrinsic::atomic_swap:
- // CAS and related intrinsics only access their arguments.
- return AliasAnalysis::AccessesArguments;
- default:
- break;
- }
- }
+AliasAnalysis::ModRefResult
+AliasAnalysis::getModRefInfo(const VAArgInst *V, const Location &Loc) {
+ // If the va_arg address cannot alias the pointer in question, then the
+ // specified memory cannot be accessed by the va_arg.
+ if (!alias(getLocation(V), Loc))
+ return NoModRef;
- if (F->doesNotAccessMemory())
- // Can't do better than this.
- return DoesNotAccessMemory;
- ModRefBehavior MRB = getModRefBehavior(F, CallSite(), Info);
- if (MRB != DoesNotAccessMemory && F->onlyReadsMemory())
- return OnlyReadsMemory;
- return MRB;
+ // If the pointer is a pointer to constant memory, then it could not have been
+ // modified by this va_arg.
+ if (pointsToConstantMemory(Loc))
+ return NoModRef;
+
+ // Otherwise, a va_arg reads and writes.
+ return ModRef;
}
AliasAnalysis::ModRefResult
-AliasAnalysis::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
- ModRefResult Mask = ModRef;
- ModRefBehavior MRB = getModRefBehavior(CS);
- if (MRB == OnlyReadsMemory)
- Mask = Ref;
- else if (MRB == DoesNotAccessMemory)
+AliasAnalysis::getModRefInfo(const AtomicCmpXchgInst *CX, const Location &Loc) {
+ // Acquire/Release cmpxchg has properties that matter for arbitrary addresses.
+ if (CX->getSuccessOrdering() > Monotonic)
+ return ModRef;
+
+ // If the cmpxchg address does not alias the location, it does not access it.
+ if (!alias(getLocation(CX), Loc))
return NoModRef;
- if (!AA) return Mask;
+ return ModRef;
+}
- // If P points to a constant memory location, the call definitely could not
- // modify the memory location.
- if ((Mask & Mod) && AA->pointsToConstantMemory(P))
- Mask = ModRefResult(Mask & ~Mod);
+AliasAnalysis::ModRefResult
+AliasAnalysis::getModRefInfo(const AtomicRMWInst *RMW, const Location &Loc) {
+ // Acquire/Release atomicrmw has properties that matter for arbitrary addresses.
+ if (RMW->getOrdering() > Monotonic)
+ return ModRef;
- return ModRefResult(Mask & AA->getModRefInfo(CS, P, Size));
+ // If the atomicrmw address does not alias the location, it does not access it.
+ if (!alias(getLocation(RMW), Loc))
+ return NoModRef;
+
+ return ModRef;
+}
+
+// FIXME: this is really just shoring-up a deficiency in alias analysis.
+// BasicAA isn't willing to spend linear time determining whether an alloca
+// was captured before or after this particular call, while we are. However,
+// with a smarter AA in place, this test is just wasting compile time.
+AliasAnalysis::ModRefResult
+AliasAnalysis::callCapturesBefore(const Instruction *I,
+ const AliasAnalysis::Location &MemLoc,
+ DominatorTree *DT) {
+ if (!DT || !DL) return AliasAnalysis::ModRef;
+
+ const Value *Object = GetUnderlyingObject(MemLoc.Ptr, DL);
+ if (!isIdentifiedObject(Object) || isa<GlobalValue>(Object) ||
+ isa<Constant>(Object))
+ return AliasAnalysis::ModRef;
+
+ ImmutableCallSite CS(I);
+ if (!CS.getInstruction() || CS.getInstruction() == Object)
+ return AliasAnalysis::ModRef;
+
+ if (llvm::PointerMayBeCapturedBefore(Object, /* ReturnCaptures */ true,
+ /* StoreCaptures */ true, I, DT,
+ /* include Object */ true))
+ return AliasAnalysis::ModRef;
+
+ unsigned ArgNo = 0;
+ AliasAnalysis::ModRefResult R = AliasAnalysis::NoModRef;
+ for (ImmutableCallSite::arg_iterator CI = CS.arg_begin(), CE = CS.arg_end();
+ CI != CE; ++CI, ++ArgNo) {
+ // Only look at the no-capture or byval pointer arguments. If this
+ // pointer were passed to arguments that were neither of these, then it
+ // couldn't be no-capture.
+ if (!(*CI)->getType()->isPointerTy() ||
+ (!CS.doesNotCapture(ArgNo) && !CS.isByValArgument(ArgNo)))
+ continue;
+
+ // If this is a no-capture pointer argument, see if we can tell that it
+ // is impossible to alias the pointer we're checking. If not, we have to
+ // assume that the call could touch the pointer, even though it doesn't
+ // escape.
+ if (isNoAlias(AliasAnalysis::Location(*CI),
+ AliasAnalysis::Location(Object)))
+ continue;
+ if (CS.doesNotAccessMemory(ArgNo))
+ continue;
+ if (CS.onlyReadsMemory(ArgNo)) {
+ R = AliasAnalysis::Ref;
+ continue;
+ }
+ return AliasAnalysis::ModRef;
+ }
+ return R;
}
// AliasAnalysis destructor: DO NOT move this to the header file for
/// AliasAnalysis interface before any other methods are called.
///
void AliasAnalysis::InitializeAliasAnalysis(Pass *P) {
- TD = &P->getAnalysis<TargetData>();
+ DataLayoutPass *DLP = P->getAnalysisIfAvailable<DataLayoutPass>();
+ DL = DLP ? &DLP->getDataLayout() : nullptr;
+ TLI = P->getAnalysisIfAvailable<TargetLibraryInfo>();
AA = &P->getAnalysis<AliasAnalysis>();
}
// getAnalysisUsage - All alias analysis implementations should invoke this
-// directly (using AliasAnalysis::getAnalysisUsage(AU)) to make sure that
-// TargetData is required by the pass.
+// directly (using AliasAnalysis::getAnalysisUsage(AU)).
void AliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<TargetData>(); // All AA's need TargetData.
AU.addRequired<AliasAnalysis>(); // All AA's chain
}
+/// getTypeStoreSize - Return the DataLayout store size for the given type,
+/// if known, or a conservative value otherwise.
+///
+uint64_t AliasAnalysis::getTypeStoreSize(Type *Ty) {
+ return DL ? DL->getTypeStoreSize(Ty) : UnknownSize;
+}
+
/// canBasicBlockModify - Return true if it is possible for execution of the
/// specified basic block to modify the value pointed to by Ptr.
///
bool AliasAnalysis::canBasicBlockModify(const BasicBlock &BB,
- const Value *Ptr, unsigned Size) {
- return canInstructionRangeModify(BB.front(), BB.back(), Ptr, Size);
+ const Location &Loc) {
+ return canInstructionRangeModify(BB.front(), BB.back(), Loc);
}
/// canInstructionRangeModify - Return true if it is possible for the execution
///
bool AliasAnalysis::canInstructionRangeModify(const Instruction &I1,
const Instruction &I2,
- const Value *Ptr, unsigned Size) {
+ const Location &Loc) {
assert(I1.getParent() == I2.getParent() &&
"Instructions not in same basic block!");
- BasicBlock::iterator I = const_cast<Instruction*>(&I1);
- BasicBlock::iterator E = const_cast<Instruction*>(&I2);
+ BasicBlock::const_iterator I = &I1;
+ BasicBlock::const_iterator E = &I2;
++E; // Convert from inclusive to exclusive range.
for (; I != E; ++I) // Check every instruction in range
- if (getModRefInfo(I, const_cast<Value*>(Ptr), Size) & Mod)
+ if (getModRefInfo(I, Loc) & Mod)
return true;
return false;
}
/// function.
bool llvm::isNoAliasCall(const Value *V) {
if (isa<CallInst>(V) || isa<InvokeInst>(V))
- return CallSite(const_cast<Instruction*>(cast<Instruction>(V)))
+ return ImmutableCallSite(cast<Instruction>(V))
.paramHasAttr(0, Attribute::NoAlias);
return false;
}
+/// isNoAliasArgument - Return true if this is an argument with the noalias
+/// attribute.
+bool llvm::isNoAliasArgument(const Value *V)
+{
+ if (const Argument *A = dyn_cast<Argument>(V))
+ return A->hasNoAliasAttr();
+ return false;
+}
+
/// isIdentifiedObject - Return true if this pointer refers to a distinct and
/// identifiable object. This returns true for:
-/// Global Variables and Functions
+/// Global Variables and Functions (but not Global Aliases)
/// Allocas and Mallocs
/// ByVal and NoAlias Arguments
/// NoAlias returns
///
bool llvm::isIdentifiedObject(const Value *V) {
- if (isa<GlobalValue>(V) || isa<AllocationInst>(V) || isNoAliasCall(V))
+ if (isa<AllocaInst>(V))
+ return true;
+ if (isa<GlobalValue>(V) && !isa<GlobalAlias>(V))
+ return true;
+ if (isNoAliasCall(V))
return true;
if (const Argument *A = dyn_cast<Argument>(V))
return A->hasNoAliasAttr() || A->hasByValAttr();
return false;
}
-// Because of the way .a files work, we must force the BasicAA implementation to
-// be pulled in if the AliasAnalysis classes are pulled in. Otherwise we run
-// the risk of AliasAnalysis being used, but the default implementation not
-// being linked into the tool that uses it.
-DEFINING_FILE_FOR(AliasAnalysis)
+/// isIdentifiedFunctionLocal - Return true if V is umabigously identified
+/// at the function-level. Different IdentifiedFunctionLocals can't alias.
+/// Further, an IdentifiedFunctionLocal can not alias with any function
+/// arguments other than itself, which is not necessarily true for
+/// IdentifiedObjects.
+bool llvm::isIdentifiedFunctionLocal(const Value *V)
+{
+ return isa<AllocaInst>(V) || isNoAliasCall(V) || isNoAliasArgument(V);
+}
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