#define LLVM_METADATA_H
#include "llvm/Value.h"
+#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/ilist_node.h"
class Instruction;
class LLVMContext;
class Module;
-class MetadataContextImpl;
template <typename T> class SmallVectorImpl;
-
-//===----------------------------------------------------------------------===//
-// MetadataBase - A base class for MDNode, MDString and NamedMDNode.
-class MetadataBase : public Value {
-protected:
- MetadataBase(const Type *Ty, unsigned scid)
- : Value(Ty, scid) {}
-
-public:
-
- /// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const MetadataBase *) { return true; }
- static bool classof(const Value *V) {
- return V->getValueID() == MDStringVal || V->getValueID() == MDNodeVal
- || V->getValueID() == NamedMDNodeVal;
- }
-};
-
+template<typename ValueSubClass, typename ItemParentClass>
+ class SymbolTableListTraits;
+
+
//===----------------------------------------------------------------------===//
/// MDString - a single uniqued string.
/// These are used to efficiently contain a byte sequence for metadata.
-/// MDString is always unnamd.
-class MDString : public MetadataBase {
- MDString(const MDString &); // DO NOT IMPLEMENT
-
- StringRef Str;
-protected:
- explicit MDString(LLVMContext &C, StringRef S);
+/// MDString is always unnamed.
+class MDString : public Value {
+ virtual void anchor();
+ MDString(const MDString &) LLVM_DELETED_FUNCTION;
+ explicit MDString(LLVMContext &C);
public:
static MDString *get(LLVMContext &Context, StringRef Str);
- static MDString *get(LLVMContext &Context, const char *Str);
-
- StringRef getString() const { return Str; }
+ static MDString *get(LLVMContext &Context, const char *Str) {
+ return get(Context, Str ? StringRef(Str) : StringRef());
+ }
+
+ StringRef getString() const { return getName(); }
- unsigned getLength() const { return (unsigned)Str.size(); }
+ unsigned getLength() const { return (unsigned)getName().size(); }
typedef StringRef::iterator iterator;
/// begin() - Pointer to the first byte of the string.
- ///
- iterator begin() const { return Str.begin(); }
+ iterator begin() const { return getName().begin(); }
/// end() - Pointer to one byte past the end of the string.
- ///
- iterator end() const { return Str.end(); }
+ iterator end() const { return getName().end(); }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const MDString *) { return true; }
static bool classof(const Value *V) {
return V->getValueID() == MDStringVal;
}
};
-class MDNodeElement;
+class MDNodeOperand;
//===----------------------------------------------------------------------===//
/// MDNode - a tuple of other values.
-/// These contain a list of the values that represent the metadata.
-/// MDNode is always unnamed.
-class MDNode : public MetadataBase, public FoldingSetNode {
- MDNode(const MDNode &); // DO NOT IMPLEMENT
- void operator=(const MDNode &); // DO NOT IMPLEMENT
- friend class MDNodeElement;
-
- MDNodeElement *Operands;
+class MDNode : public Value, public FoldingSetNode {
+ MDNode(const MDNode &) LLVM_DELETED_FUNCTION;
+ void operator=(const MDNode &) LLVM_DELETED_FUNCTION;
+ friend class MDNodeOperand;
+ friend class LLVMContextImpl;
+ friend struct FoldingSetTrait<MDNode>;
+
+ /// Hash - If the MDNode is uniqued cache the hash to speed up lookup.
+ unsigned Hash;
+
+ /// NumOperands - This many 'MDNodeOperand' items are co-allocated onto the
+ /// end of this MDNode.
unsigned NumOperands;
// Subclass data enums.
enum {
- FunctionLocalBit = 1
+ /// FunctionLocalBit - This bit is set if this MDNode is function local.
+ /// This is true when it (potentially transitively) contains a reference to
+ /// something in a function, like an argument, basicblock, or instruction.
+ FunctionLocalBit = 1 << 0,
+
+ /// NotUniquedBit - This is set on MDNodes that are not uniqued because they
+ /// have a null operand.
+ NotUniquedBit = 1 << 1,
+
+ /// DestroyFlag - This bit is set by destroy() so the destructor can assert
+ /// that the node isn't being destroyed with a plain 'delete'.
+ DestroyFlag = 1 << 2
+ };
+
+ // FunctionLocal enums.
+ enum FunctionLocalness {
+ FL_Unknown = -1,
+ FL_No = 0,
+ FL_Yes = 1
};
- // Replace each instance of F from the element list of this node with T.
- void replaceElement(MDNodeElement *Op, Value *NewVal);
+ /// replaceOperand - Replace each instance of F from the operand list of this
+ /// node with T.
+ void replaceOperand(MDNodeOperand *Op, Value *NewVal);
+ ~MDNode();
-protected:
- explicit MDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,
- bool isFunctionLocal);
+ MDNode(LLVMContext &C, ArrayRef<Value*> Vals, bool isFunctionLocal);
+
+ static MDNode *getMDNode(LLVMContext &C, ArrayRef<Value*> Vals,
+ FunctionLocalness FL, bool Insert = true);
public:
// Constructors and destructors.
- static MDNode *get(LLVMContext &Context, Value *const *Vals, unsigned NumVals,
- bool isFunctionLocal = false);
-
- /// ~MDNode - Destroy MDNode.
- ~MDNode();
+ static MDNode *get(LLVMContext &Context, ArrayRef<Value*> Vals);
+ // getWhenValsUnresolved - Construct MDNode determining function-localness
+ // from isFunctionLocal argument, not by analyzing Vals.
+ static MDNode *getWhenValsUnresolved(LLVMContext &Context,
+ ArrayRef<Value*> Vals,
+ bool isFunctionLocal);
+
+ static MDNode *getIfExists(LLVMContext &Context, ArrayRef<Value*> Vals);
+
+ /// getTemporary - Return a temporary MDNode, for use in constructing
+ /// cyclic MDNode structures. A temporary MDNode is not uniqued,
+ /// may be RAUW'd, and must be manually deleted with deleteTemporary.
+ static MDNode *getTemporary(LLVMContext &Context, ArrayRef<Value*> Vals);
+
+ /// deleteTemporary - Deallocate a node created by getTemporary. The
+ /// node must not have any users.
+ static void deleteTemporary(MDNode *N);
+
+ /// replaceOperandWith - Replace a specific operand.
+ void replaceOperandWith(unsigned i, Value *NewVal);
- /// getElement - Return specified element.
- Value *getElement(unsigned i) const;
+ /// getOperand - Return specified operand.
+ Value *getOperand(unsigned i) const;
- /// getNumElements - Return number of MDNode elements.
- unsigned getNumElements() const { return NumOperands; }
+ /// getNumOperands - Return number of MDNode operands.
+ unsigned getNumOperands() const { return NumOperands; }
/// isFunctionLocal - Return whether MDNode is local to a function.
- /// Note: MDNodes are designated as function-local when created, and keep
- /// that designation even if their operands are modified to no longer
- /// refer to function-local IR.
bool isFunctionLocal() const {
return (getSubclassDataFromValue() & FunctionLocalBit) != 0;
}
+
+ // getFunction - If this metadata is function-local and recursively has a
+ // function-local operand, return the first such operand's parent function.
+ // Otherwise, return null. getFunction() should not be used for performance-
+ // critical code because it recursively visits all the MDNode's operands.
+ const Function *getFunction() const;
/// Profile - calculate a unique identifier for this MDNode to collapse
/// duplicates
void Profile(FoldingSetNodeID &ID) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const MDNode *) { return true; }
static bool classof(const Value *V) {
return V->getValueID() == MDNodeVal;
}
+
+ /// Methods for metadata merging.
+ static MDNode *getMostGenericTBAA(MDNode *A, MDNode *B);
+ static MDNode *getMostGenericFPMath(MDNode *A, MDNode *B);
+ static MDNode *getMostGenericRange(MDNode *A, MDNode *B);
private:
+ // destroy - Delete this node. Only when there are no uses.
+ void destroy();
+
+ bool isNotUniqued() const {
+ return (getSubclassDataFromValue() & NotUniquedBit) != 0;
+ }
+ void setIsNotUniqued();
+
// Shadow Value::setValueSubclassData with a private forwarding method so that
// any future subclasses cannot accidentally use it.
void setValueSubclassData(unsigned short D) {
};
//===----------------------------------------------------------------------===//
-/// NamedMDNode - a tuple of other metadata.
-/// NamedMDNode is always named. All NamedMDNode element has a type of metadata.
-template<typename ValueSubClass, typename ItemParentClass>
- class SymbolTableListTraits;
-
-class NamedMDNode : public MetadataBase, public ilist_node<NamedMDNode> {
+/// NamedMDNode - a tuple of MDNodes. Despite its name, a NamedMDNode isn't
+/// itself an MDNode. NamedMDNodes belong to modules, have names, and contain
+/// lists of MDNodes.
+class NamedMDNode : public ilist_node<NamedMDNode> {
friend class SymbolTableListTraits<NamedMDNode, Module>;
+ friend struct ilist_traits<NamedMDNode>;
friend class LLVMContextImpl;
+ friend class Module;
+ NamedMDNode(const NamedMDNode &) LLVM_DELETED_FUNCTION;
- NamedMDNode(const NamedMDNode &); // DO NOT IMPLEMENT
-
+ std::string Name;
Module *Parent;
- void *Operands; // SmallVector<TrackingVH<MetadataBase>, 4>
+ void *Operands; // SmallVector<TrackingVH<MDNode>, 4>
void setParent(Module *M) { Parent = M; }
-protected:
- explicit NamedMDNode(LLVMContext &C, const Twine &N, MetadataBase*const *Vals,
- unsigned NumVals, Module *M = 0);
-public:
- static NamedMDNode *Create(LLVMContext &C, const Twine &N,
- MetadataBase *const *MDs,
- unsigned NumMDs, Module *M = 0) {
- return new NamedMDNode(C, N, MDs, NumMDs, M);
- }
- static NamedMDNode *Create(const NamedMDNode *NMD, Module *M = 0);
+ explicit NamedMDNode(const Twine &N);
+public:
/// eraseFromParent - Drop all references and remove the node from parent
/// module.
void eraseFromParent();
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }
- /// getElement - Return specified element.
- MetadataBase *getElement(unsigned i) const;
-
- /// getNumElements - Return number of NamedMDNode elements.
- unsigned getNumElements() const;
-
- /// addElement - Add metadata element.
- void addElement(MetadataBase *M);
+ /// getOperand - Return specified operand.
+ MDNode *getOperand(unsigned i) const;
- /// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const NamedMDNode *) { return true; }
- static bool classof(const Value *V) {
- return V->getValueID() == NamedMDNodeVal;
- }
-};
-
-//===----------------------------------------------------------------------===//
-/// MetadataContext - MetadataContext handles uniquing and assignment of IDs for
-/// custom metadata types.
-///
-class MetadataContext {
- MetadataContext(MetadataContext&); // DO NOT IMPLEMENT
- void operator=(MetadataContext&); // DO NOT IMPLEMENT
-
- MetadataContextImpl *const pImpl;
- friend class Instruction;
-public:
- MetadataContext();
- ~MetadataContext();
-
- /// getMDKindID - Return a unique non-zero ID for the specified metadata kind.
- unsigned getMDKindID(StringRef Name) const;
-
- /// isValidName - Return true if Name is a valid custom metadata handler name.
- static bool isValidName(StringRef Name);
+ /// getNumOperands - Return the number of NamedMDNode operands.
+ unsigned getNumOperands() const;
- /// copyMD - If metadata is attached with Instruction In1 then attach
- /// the same metadata to In2.
- void copyMD(Instruction *In1, Instruction *In2);
+ /// addOperand - Add metadata operand.
+ void addOperand(MDNode *M);
- /// getMDKindNames - Populate client supplied SmallVector with the name for
- /// each custom metadata ID. ID #0 is not used, so it is filled in as empty.
- void getMDKindNames(SmallVectorImpl<StringRef> &) const;
+ /// getName - Return a constant reference to this named metadata's name.
+ StringRef getName() const;
- /// ValueIsDeleted - This handler is used to update metadata store
- /// when a value is deleted.
- void ValueIsDeleted(const Value *) {}
- void ValueIsDeleted(Instruction *Inst);
- void ValueIsRAUWd(Value *V1, Value *V2);
+ /// print - Implement operator<< on NamedMDNode.
+ void print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW = 0) const;
- /// ValueIsCloned - This handler is used to update metadata store
- /// when In1 is cloned to create In2.
- void ValueIsCloned(const Instruction *In1, Instruction *In2);
+ /// dump() - Allow printing of NamedMDNodes from the debugger.
+ void dump() const;
};
} // end llvm namespace
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