X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FAnalysis%2FTypeBasedAliasAnalysis.cpp;h=427f0901f22e771531d2ac118399b8dbd3c4725b;hp=620d1799a5499e877c807cd97fd413a1b1ad8eeb;hb=51d9f587b74d8877c6098cacccc654e89d860ac5;hpb=570e52c6f17d8819ee4c8595fc79d17a6dc51dd9 diff --git a/lib/Analysis/TypeBasedAliasAnalysis.cpp b/lib/Analysis/TypeBasedAliasAnalysis.cpp index 620d1799a54..427f0901f22 100644 --- a/lib/Analysis/TypeBasedAliasAnalysis.cpp +++ b/lib/Analysis/TypeBasedAliasAnalysis.cpp @@ -129,6 +129,7 @@ #include "llvm/IR/Module.h" #include "llvm/Pass.h" #include "llvm/Support/CommandLine.h" +#include "llvm/ADT/SetVector.h" using namespace llvm; // A handy option for disabling TBAA functionality. The same effect can also be @@ -137,179 +138,178 @@ using namespace llvm; static cl::opt EnableTBAA("enable-tbaa", cl::init(true)); namespace { - /// TBAANode - This is a simple wrapper around an MDNode which provides a - /// higher-level interface by hiding the details of how alias analysis - /// information is encoded in its operands. - class TBAANode { - const MDNode *Node; - - public: - TBAANode() : Node(nullptr) {} - explicit TBAANode(const MDNode *N) : Node(N) {} - - /// getNode - Get the MDNode for this TBAANode. - const MDNode *getNode() const { return Node; } - - /// getParent - Get this TBAANode's Alias tree parent. - TBAANode getParent() const { - if (Node->getNumOperands() < 2) - return TBAANode(); - MDNode *P = dyn_cast_or_null(Node->getOperand(1)); - if (!P) - return TBAANode(); - // Ok, this node has a valid parent. Return it. - return TBAANode(P); - } - - /// TypeIsImmutable - Test if this TBAANode represents a type for objects - /// which are not modified (by any means) in the context where this - /// AliasAnalysis is relevant. - bool TypeIsImmutable() const { - if (Node->getNumOperands() < 3) - return false; - ConstantInt *CI = dyn_cast(Node->getOperand(2)); - if (!CI) - return false; - return CI->getValue()[0]; - } - }; - - /// This is a simple wrapper around an MDNode which provides a - /// higher-level interface by hiding the details of how alias analysis - /// information is encoded in its operands. - class TBAAStructTagNode { - /// This node should be created with createTBAAStructTagNode. - const MDNode *Node; +/// TBAANode - This is a simple wrapper around an MDNode which provides a +/// higher-level interface by hiding the details of how alias analysis +/// information is encoded in its operands. +class TBAANode { + const MDNode *Node; + +public: + TBAANode() : Node(nullptr) {} + explicit TBAANode(const MDNode *N) : Node(N) {} + + /// getNode - Get the MDNode for this TBAANode. + const MDNode *getNode() const { return Node; } + + /// getParent - Get this TBAANode's Alias tree parent. + TBAANode getParent() const { + if (Node->getNumOperands() < 2) + return TBAANode(); + MDNode *P = dyn_cast_or_null(Node->getOperand(1)); + if (!P) + return TBAANode(); + // Ok, this node has a valid parent. Return it. + return TBAANode(P); + } - public: - TBAAStructTagNode() : Node(nullptr) {} - explicit TBAAStructTagNode(const MDNode *N) : Node(N) {} + /// TypeIsImmutable - Test if this TBAANode represents a type for objects + /// which are not modified (by any means) in the context where this + /// AliasAnalysis is relevant. + bool TypeIsImmutable() const { + if (Node->getNumOperands() < 3) + return false; + ConstantInt *CI = mdconst::dyn_extract(Node->getOperand(2)); + if (!CI) + return false; + return CI->getValue()[0]; + } +}; - /// Get the MDNode for this TBAAStructTagNode. - const MDNode *getNode() const { return Node; } +/// This is a simple wrapper around an MDNode which provides a +/// higher-level interface by hiding the details of how alias analysis +/// information is encoded in its operands. +class TBAAStructTagNode { + /// This node should be created with createTBAAStructTagNode. + const MDNode *Node; - const MDNode *getBaseType() const { - return dyn_cast_or_null(Node->getOperand(0)); - } - const MDNode *getAccessType() const { - return dyn_cast_or_null(Node->getOperand(1)); - } - uint64_t getOffset() const { - return cast(Node->getOperand(2))->getZExtValue(); - } - /// TypeIsImmutable - Test if this TBAAStructTagNode represents a type for - /// objects which are not modified (by any means) in the context where this - /// AliasAnalysis is relevant. - bool TypeIsImmutable() const { - if (Node->getNumOperands() < 4) - return false; - ConstantInt *CI = dyn_cast(Node->getOperand(3)); - if (!CI) - return false; - return CI->getValue()[0]; - } - }; - - /// This is a simple wrapper around an MDNode which provides a - /// higher-level interface by hiding the details of how alias analysis - /// information is encoded in its operands. - class TBAAStructTypeNode { - /// This node should be created with createTBAAStructTypeNode. - const MDNode *Node; - - public: - TBAAStructTypeNode() : Node(nullptr) {} - explicit TBAAStructTypeNode(const MDNode *N) : Node(N) {} - - /// Get the MDNode for this TBAAStructTypeNode. - const MDNode *getNode() const { return Node; } - - /// Get this TBAAStructTypeNode's field in the type DAG with - /// given offset. Update the offset to be relative to the field type. - TBAAStructTypeNode getParent(uint64_t &Offset) const { - // Parent can be omitted for the root node. - if (Node->getNumOperands() < 2) - return TBAAStructTypeNode(); +public: + explicit TBAAStructTagNode(const MDNode *N) : Node(N) {} - // Fast path for a scalar type node and a struct type node with a single - // field. - if (Node->getNumOperands() <= 3) { - uint64_t Cur = Node->getNumOperands() == 2 ? 0 : - cast(Node->getOperand(2))->getZExtValue(); - Offset -= Cur; - MDNode *P = dyn_cast_or_null(Node->getOperand(1)); - if (!P) - return TBAAStructTypeNode(); - return TBAAStructTypeNode(P); - } + /// Get the MDNode for this TBAAStructTagNode. + const MDNode *getNode() const { return Node; } - // Assume the offsets are in order. We return the previous field if - // the current offset is bigger than the given offset. - unsigned TheIdx = 0; - for (unsigned Idx = 1; Idx < Node->getNumOperands(); Idx += 2) { - uint64_t Cur = cast(Node->getOperand(Idx + 1))-> - getZExtValue(); - if (Cur > Offset) { - assert(Idx >= 3 && - "TBAAStructTypeNode::getParent should have an offset match!"); - TheIdx = Idx - 2; - break; - } - } - // Move along the last field. - if (TheIdx == 0) - TheIdx = Node->getNumOperands() - 2; - uint64_t Cur = cast(Node->getOperand(TheIdx + 1))-> - getZExtValue(); + const MDNode *getBaseType() const { + return dyn_cast_or_null(Node->getOperand(0)); + } + const MDNode *getAccessType() const { + return dyn_cast_or_null(Node->getOperand(1)); + } + uint64_t getOffset() const { + return mdconst::extract(Node->getOperand(2))->getZExtValue(); + } + /// TypeIsImmutable - Test if this TBAAStructTagNode represents a type for + /// objects which are not modified (by any means) in the context where this + /// AliasAnalysis is relevant. + bool TypeIsImmutable() const { + if (Node->getNumOperands() < 4) + return false; + ConstantInt *CI = mdconst::dyn_extract(Node->getOperand(3)); + if (!CI) + return false; + return CI->getValue()[0]; + } +}; + +/// This is a simple wrapper around an MDNode which provides a +/// higher-level interface by hiding the details of how alias analysis +/// information is encoded in its operands. +class TBAAStructTypeNode { + /// This node should be created with createTBAAStructTypeNode. + const MDNode *Node; + +public: + TBAAStructTypeNode() : Node(nullptr) {} + explicit TBAAStructTypeNode(const MDNode *N) : Node(N) {} + + /// Get the MDNode for this TBAAStructTypeNode. + const MDNode *getNode() const { return Node; } + + /// Get this TBAAStructTypeNode's field in the type DAG with + /// given offset. Update the offset to be relative to the field type. + TBAAStructTypeNode getParent(uint64_t &Offset) const { + // Parent can be omitted for the root node. + if (Node->getNumOperands() < 2) + return TBAAStructTypeNode(); + + // Fast path for a scalar type node and a struct type node with a single + // field. + if (Node->getNumOperands() <= 3) { + uint64_t Cur = Node->getNumOperands() == 2 + ? 0 + : mdconst::extract(Node->getOperand(2)) + ->getZExtValue(); Offset -= Cur; - MDNode *P = dyn_cast_or_null(Node->getOperand(TheIdx)); + MDNode *P = dyn_cast_or_null(Node->getOperand(1)); if (!P) return TBAAStructTypeNode(); return TBAAStructTypeNode(P); } - }; + + // Assume the offsets are in order. We return the previous field if + // the current offset is bigger than the given offset. + unsigned TheIdx = 0; + for (unsigned Idx = 1; Idx < Node->getNumOperands(); Idx += 2) { + uint64_t Cur = mdconst::extract(Node->getOperand(Idx + 1)) + ->getZExtValue(); + if (Cur > Offset) { + assert(Idx >= 3 && + "TBAAStructTypeNode::getParent should have an offset match!"); + TheIdx = Idx - 2; + break; + } + } + // Move along the last field. + if (TheIdx == 0) + TheIdx = Node->getNumOperands() - 2; + uint64_t Cur = mdconst::extract(Node->getOperand(TheIdx + 1)) + ->getZExtValue(); + Offset -= Cur; + MDNode *P = dyn_cast_or_null(Node->getOperand(TheIdx)); + if (!P) + return TBAAStructTypeNode(); + return TBAAStructTypeNode(P); + } +}; } namespace { - /// TypeBasedAliasAnalysis - This is a simple alias analysis - /// implementation that uses TypeBased to answer queries. - class TypeBasedAliasAnalysis : public ImmutablePass, - public AliasAnalysis { - public: - static char ID; // Class identification, replacement for typeinfo - TypeBasedAliasAnalysis() : ImmutablePass(ID) { - initializeTypeBasedAliasAnalysisPass(*PassRegistry::getPassRegistry()); - } +/// TypeBasedAliasAnalysis - This is a simple alias analysis +/// implementation that uses TypeBased to answer queries. +class TypeBasedAliasAnalysis : public ImmutablePass, public AliasAnalysis { +public: + static char ID; // Class identification, replacement for typeinfo + TypeBasedAliasAnalysis() : ImmutablePass(ID) { + initializeTypeBasedAliasAnalysisPass(*PassRegistry::getPassRegistry()); + } - void initializePass() override { - InitializeAliasAnalysis(this); - } + bool doInitialization(Module &M) override; - /// getAdjustedAnalysisPointer - This method is used when a pass implements - /// an analysis interface through multiple inheritance. If needed, it - /// should override this to adjust the this pointer as needed for the - /// specified pass info. - void *getAdjustedAnalysisPointer(const void *PI) override { - if (PI == &AliasAnalysis::ID) - return (AliasAnalysis*)this; - return this; - } + /// getAdjustedAnalysisPointer - This method is used when a pass implements + /// an analysis interface through multiple inheritance. If needed, it + /// should override this to adjust the this pointer as needed for the + /// specified pass info. + void *getAdjustedAnalysisPointer(const void *PI) override { + if (PI == &AliasAnalysis::ID) + return (AliasAnalysis *)this; + return this; + } - bool Aliases(const MDNode *A, const MDNode *B) const; - bool PathAliases(const MDNode *A, const MDNode *B) const; - - private: - void getAnalysisUsage(AnalysisUsage &AU) const override; - AliasResult alias(const Location &LocA, const Location &LocB) override; - bool pointsToConstantMemory(const Location &Loc, bool OrLocal) override; - ModRefBehavior getModRefBehavior(ImmutableCallSite CS) override; - ModRefBehavior getModRefBehavior(const Function *F) override; - ModRefResult getModRefInfo(ImmutableCallSite CS, - const Location &Loc) override; - ModRefResult getModRefInfo(ImmutableCallSite CS1, - ImmutableCallSite CS2) override; - }; -} // End of anonymous namespace + bool Aliases(const MDNode *A, const MDNode *B) const; + bool PathAliases(const MDNode *A, const MDNode *B) const; + +private: + void getAnalysisUsage(AnalysisUsage &AU) const override; + AliasResult alias(const MemoryLocation &LocA, + const MemoryLocation &LocB) override; + bool pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal) override; + FunctionModRefBehavior getModRefBehavior(ImmutableCallSite CS) override; + FunctionModRefBehavior getModRefBehavior(const Function *F) override; + ModRefInfo getModRefInfo(ImmutableCallSite CS, + const MemoryLocation &Loc) override; + ModRefInfo getModRefInfo(ImmutableCallSite CS1, + ImmutableCallSite CS2) override; +}; +} // End of anonymous namespace // Register this pass... char TypeBasedAliasAnalysis::ID = 0; @@ -320,8 +320,12 @@ ImmutablePass *llvm::createTypeBasedAliasAnalysisPass() { return new TypeBasedAliasAnalysis(); } -void -TypeBasedAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const { +bool TypeBasedAliasAnalysis::doInitialization(Module &M) { + InitializeAliasAnalysis(this, &M.getDataLayout()); + return true; +} + +void TypeBasedAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesAll(); AliasAnalysis::getAnalysisUsage(AU); } @@ -337,17 +341,16 @@ static bool isStructPathTBAA(const MDNode *MD) { /// Aliases - Test whether the type represented by A may alias the /// type represented by B. -bool -TypeBasedAliasAnalysis::Aliases(const MDNode *A, - const MDNode *B) const { - if (isStructPathTBAA(A)) +bool TypeBasedAliasAnalysis::Aliases(const MDNode *A, const MDNode *B) const { + // Make sure that both MDNodes are struct-path aware. + if (isStructPathTBAA(A) && isStructPathTBAA(B)) return PathAliases(A, B); // Keep track of the root node for A and B. TBAANode RootA, RootB; // Climb the tree from A to see if we reach B. - for (TBAANode T(A); ; ) { + for (TBAANode T(A);;) { if (T.getNode() == B) // B is an ancestor of A. return true; @@ -359,7 +362,7 @@ TypeBasedAliasAnalysis::Aliases(const MDNode *A, } // Climb the tree from B to see if we reach A. - for (TBAANode T(B); ; ) { + for (TBAANode T(B);;) { if (T.getNode() == A) // A is an ancestor of B. return true; @@ -371,7 +374,7 @@ TypeBasedAliasAnalysis::Aliases(const MDNode *A, } // Neither node is an ancestor of the other. - + // If they have different roots, they're part of different potentially // unrelated type systems, so we must be conservative. if (RootA.getNode() != RootB.getNode()) @@ -383,9 +386,12 @@ TypeBasedAliasAnalysis::Aliases(const MDNode *A, /// Test whether the struct-path tag represented by A may alias the /// struct-path tag represented by B. -bool -TypeBasedAliasAnalysis::PathAliases(const MDNode *A, - const MDNode *B) const { +bool TypeBasedAliasAnalysis::PathAliases(const MDNode *A, + const MDNode *B) const { + // Verify that both input nodes are struct-path aware. + assert(isStructPathTBAA(A) && "MDNode A is not struct-path aware."); + assert(isStructPathTBAA(B) && "MDNode B is not struct-path aware."); + // Keep track of the root node for A and B. TBAAStructTypeNode RootA, RootB; TBAAStructTagNode TagA(A), TagB(B); @@ -402,7 +408,7 @@ TypeBasedAliasAnalysis::PathAliases(const MDNode *A, const MDNode *BaseA = TagA.getBaseType(); const MDNode *BaseB = TagB.getBaseType(); uint64_t OffsetA = TagA.getOffset(), OffsetB = TagB.getOffset(); - for (TBAAStructTypeNode T(BaseA); ; ) { + for (TBAAStructTypeNode T(BaseA);;) { if (T.getNode() == BaseB) // Base type of A encloses base type of B, check if the offsets match. return OffsetA == OffsetB; @@ -418,7 +424,7 @@ TypeBasedAliasAnalysis::PathAliases(const MDNode *A, // Reset OffsetA and climb the type DAG from base type of B to see if we reach // base type of A. OffsetA = TagA.getOffset(); - for (TBAAStructTypeNode T(BaseB); ; ) { + for (TBAAStructTypeNode T(BaseB);;) { if (T.getNode() == BaseA) // Base type of B encloses base type of A, check if the offsets match. return OffsetA == OffsetB; @@ -442,18 +448,19 @@ TypeBasedAliasAnalysis::PathAliases(const MDNode *A, return false; } -AliasAnalysis::AliasResult -TypeBasedAliasAnalysis::alias(const Location &LocA, - const Location &LocB) { +AliasResult TypeBasedAliasAnalysis::alias(const MemoryLocation &LocA, + const MemoryLocation &LocB) { if (!EnableTBAA) return AliasAnalysis::alias(LocA, LocB); // Get the attached MDNodes. If either value lacks a tbaa MDNode, we must // be conservative. - const MDNode *AM = LocA.TBAATag; - if (!AM) return AliasAnalysis::alias(LocA, LocB); - const MDNode *BM = LocB.TBAATag; - if (!BM) return AliasAnalysis::alias(LocA, LocB); + const MDNode *AM = LocA.AATags.TBAA; + if (!AM) + return AliasAnalysis::alias(LocA, LocB); + const MDNode *BM = LocB.AATags.TBAA; + if (!BM) + return AliasAnalysis::alias(LocA, LocB); // If they may alias, chain to the next AliasAnalysis. if (Aliases(AM, BM)) @@ -463,13 +470,14 @@ TypeBasedAliasAnalysis::alias(const Location &LocA, return NoAlias; } -bool TypeBasedAliasAnalysis::pointsToConstantMemory(const Location &Loc, +bool TypeBasedAliasAnalysis::pointsToConstantMemory(const MemoryLocation &Loc, bool OrLocal) { if (!EnableTBAA) return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal); - const MDNode *M = Loc.TBAATag; - if (!M) return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal); + const MDNode *M = Loc.AATags.TBAA; + if (!M) + return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal); // If this is an "immutable" type, we can assume the pointer is pointing // to constant memory. @@ -480,77 +488,80 @@ bool TypeBasedAliasAnalysis::pointsToConstantMemory(const Location &Loc, return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal); } -AliasAnalysis::ModRefBehavior +FunctionModRefBehavior TypeBasedAliasAnalysis::getModRefBehavior(ImmutableCallSite CS) { if (!EnableTBAA) return AliasAnalysis::getModRefBehavior(CS); - ModRefBehavior Min = UnknownModRefBehavior; + FunctionModRefBehavior Min = FMRB_UnknownModRefBehavior; // If this is an "immutable" type, we can assume the call doesn't write // to memory. if (const MDNode *M = CS.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) if ((!isStructPathTBAA(M) && TBAANode(M).TypeIsImmutable()) || (isStructPathTBAA(M) && TBAAStructTagNode(M).TypeIsImmutable())) - Min = OnlyReadsMemory; + Min = FMRB_OnlyReadsMemory; - return ModRefBehavior(AliasAnalysis::getModRefBehavior(CS) & Min); + return FunctionModRefBehavior(AliasAnalysis::getModRefBehavior(CS) & Min); } -AliasAnalysis::ModRefBehavior +FunctionModRefBehavior TypeBasedAliasAnalysis::getModRefBehavior(const Function *F) { // Functions don't have metadata. Just chain to the next implementation. return AliasAnalysis::getModRefBehavior(F); } -AliasAnalysis::ModRefResult -TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS, - const Location &Loc) { +ModRefInfo TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS, + const MemoryLocation &Loc) { if (!EnableTBAA) return AliasAnalysis::getModRefInfo(CS, Loc); - if (const MDNode *L = Loc.TBAATag) + if (const MDNode *L = Loc.AATags.TBAA) if (const MDNode *M = - CS.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) + CS.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) if (!Aliases(L, M)) - return NoModRef; + return MRI_NoModRef; return AliasAnalysis::getModRefInfo(CS, Loc); } -AliasAnalysis::ModRefResult -TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS1, - ImmutableCallSite CS2) { +ModRefInfo TypeBasedAliasAnalysis::getModRefInfo(ImmutableCallSite CS1, + ImmutableCallSite CS2) { if (!EnableTBAA) return AliasAnalysis::getModRefInfo(CS1, CS2); if (const MDNode *M1 = - CS1.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) + CS1.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) if (const MDNode *M2 = - CS2.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) + CS2.getInstruction()->getMetadata(LLVMContext::MD_tbaa)) if (!Aliases(M1, M2)) - return NoModRef; + return MRI_NoModRef; return AliasAnalysis::getModRefInfo(CS1, CS2); } bool MDNode::isTBAAVtableAccess() const { if (!isStructPathTBAA(this)) { - if (getNumOperands() < 1) return false; + if (getNumOperands() < 1) + return false; if (MDString *Tag1 = dyn_cast(getOperand(0))) { - if (Tag1->getString() == "vtable pointer") return true; + if (Tag1->getString() == "vtable pointer") + return true; } return false; } // For struct-path aware TBAA, we use the access type of the tag. - if (getNumOperands() < 2) return false; + if (getNumOperands() < 2) + return false; MDNode *Tag = cast_or_null(getOperand(1)); - if (!Tag) return false; + if (!Tag) + return false; if (MDString *Tag1 = dyn_cast(Tag->getOperand(0))) { - if (Tag1->getString() == "vtable pointer") return true; + if (Tag1->getString() == "vtable pointer") + return true; } - return false; + return false; } MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) { @@ -561,26 +572,32 @@ MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) { return A; // For struct-path aware TBAA, we use the access type of the tag. - bool StructPath = isStructPathTBAA(A); + bool StructPath = isStructPathTBAA(A) && isStructPathTBAA(B); if (StructPath) { A = cast_or_null(A->getOperand(1)); - if (!A) return nullptr; + if (!A) + return nullptr; B = cast_or_null(B->getOperand(1)); - if (!B) return nullptr; + if (!B) + return nullptr; } - SmallVector PathA; + SmallSetVector PathA; MDNode *T = A; while (T) { - PathA.push_back(T); + if (PathA.count(T)) + report_fatal_error("Cycle found in TBAA metadata."); + PathA.insert(T); T = T->getNumOperands() >= 2 ? cast_or_null(T->getOperand(1)) : nullptr; } - SmallVector PathB; + SmallSetVector PathB; T = B; while (T) { - PathB.push_back(T); + if (PathB.count(T)) + report_fatal_error("Cycle found in TBAA metadata."); + PathB.insert(T); T = T->getNumOperands() >= 2 ? cast_or_null(T->getOperand(1)) : nullptr; } @@ -589,7 +606,7 @@ MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) { int IB = PathB.size() - 1; MDNode *Ret = nullptr; - while (IA >= 0 && IB >=0) { + while (IA >= 0 && IB >= 0) { if (PathA[IA] == PathB[IB]) Ret = PathA[IA]; else @@ -604,6 +621,28 @@ MDNode *MDNode::getMostGenericTBAA(MDNode *A, MDNode *B) { return nullptr; // We need to convert from a type node to a tag node. Type *Int64 = IntegerType::get(A->getContext(), 64); - Value *Ops[3] = { Ret, Ret, ConstantInt::get(Int64, 0) }; + Metadata *Ops[3] = {Ret, Ret, + ConstantAsMetadata::get(ConstantInt::get(Int64, 0))}; return MDNode::get(A->getContext(), Ops); } + +void Instruction::getAAMetadata(AAMDNodes &N, bool Merge) const { + if (Merge) + N.TBAA = + MDNode::getMostGenericTBAA(N.TBAA, getMetadata(LLVMContext::MD_tbaa)); + else + N.TBAA = getMetadata(LLVMContext::MD_tbaa); + + if (Merge) + N.Scope = MDNode::getMostGenericAliasScope( + N.Scope, getMetadata(LLVMContext::MD_alias_scope)); + else + N.Scope = getMetadata(LLVMContext::MD_alias_scope); + + if (Merge) + N.NoAlias = + MDNode::intersect(N.NoAlias, getMetadata(LLVMContext::MD_noalias)); + else + N.NoAlias = getMetadata(LLVMContext::MD_noalias); +} +