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//===-- llvm/Metadata.h - Metadata definitions ------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// @file
/// This file contains the declarations for metadata subclasses.
/// They represent the different flavors of metadata that live in LLVM.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MDNODE_H
#define LLVM_MDNODE_H
#include "llvm/Value.h"
#include "llvm/Type.h"
#include "llvm/OperandTraits.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ValueHandle.h"
namespace llvm {
class Constant;
//===----------------------------------------------------------------------===//
// MetadataBase - A base class for MDNode, MDString and NamedMDNode.
class MetadataBase : public Value {
protected:
MetadataBase(const Type *Ty, unsigned scid)
: Value(Ty, scid) {}
public:
/// getType() specialization - Type is always MetadataTy.
///
inline const Type *getType() const {
return Type::MetadataTy;
}
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. This always returns false because getNullValue will never
/// produce metadata.
virtual bool isNullValue() const {
return false;
}
/// 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 || V->getValueID() == MDNodeVal
|| V->getValueID() == NamedMDNodeVal;
}
};
//===----------------------------------------------------------------------===//
/// 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;
friend class LLVMContextImpl;
protected:
explicit MDString(const char *begin, unsigned l)
: MetadataBase(Type::MetadataTy, Value::MDStringVal), Str(begin, l) {}
public:
StringRef getString() const { return Str; }
unsigned length() const { return Str.size(); }
/// begin() - Pointer to the first byte of the string.
///
const char *begin() const { return Str.begin(); }
/// end() - Pointer to one byte past the end of the string.
///
const char *end() const { return Str.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;
}
};
//===----------------------------------------------------------------------===//
/// 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
friend class LLVMContextImpl;
SmallVector<WeakVH, 4> Node;
typedef SmallVectorImpl<WeakVH>::iterator elem_iterator;
protected:
explicit MDNode(Value*const* Vals, unsigned NumVals);
public:
typedef SmallVectorImpl<WeakVH>::const_iterator const_elem_iterator;
Value *getElement(unsigned i) const {
return Node[i];
}
unsigned getNumElements() const {
return Node.size();
}
bool elem_empty() const {
return Node.empty();
}
const_elem_iterator elem_begin() const {
return Node.begin();
}
const_elem_iterator elem_end() const {
return Node.end();
}
/// getType() specialization - Type is always MetadataTy.
///
inline const Type *getType() const {
return Type::MetadataTy;
}
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. This always returns false because getNullValue will never
/// produce metadata.
virtual bool isNullValue() const {
return false;
}
/// Profile - calculate a unique identifier for this MDNode to collapse
/// duplicates
void Profile(FoldingSetNodeID &ID) const;
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
llvm_unreachable("This should never be called because MDNodes have no ops");
}
/// 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;
}
};
//===----------------------------------------------------------------------===//
/// WeakMetadataVH - a weak value handle for metadata.
class WeakMetadataVH : public WeakVH {
public:
WeakMetadataVH() : WeakVH() {}
WeakMetadataVH(MetadataBase *M) : WeakVH(M) {}
WeakMetadataVH(const WeakMetadataVH &RHS) : WeakVH(RHS) {}
operator Value*() const {
llvm_unreachable("WeakMetadataVH only handles Metadata");
}
operator MetadataBase*() const {
return cast<MetadataBase>(getValPtr());
}
};
//===----------------------------------------------------------------------===//
/// 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> {
friend class SymbolTableListTraits<NamedMDNode, Module>;
NamedMDNode(const NamedMDNode &); // DO NOT IMPLEMENT
friend class LLVMContextImpl;
Module *Parent;
SmallVector<WeakMetadataVH, 4> Node;
typedef SmallVectorImpl<WeakMetadataVH>::iterator elem_iterator;
protected:
explicit NamedMDNode(const Twine &N, MetadataBase*const* Vals,
unsigned NumVals, Module *M = 0);
public:
static NamedMDNode *Create(const Twine &N, MetadataBase*const*MDs,
unsigned NumMDs, Module *M = 0) {
return new NamedMDNode(N, MDs, NumMDs, M);
}
typedef SmallVectorImpl<WeakMetadataVH>::const_iterator const_elem_iterator;
/// getParent - Get the module that holds this named metadata collection.
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }
void setParent(Module *M) { Parent = M; }
MetadataBase *getElement(unsigned i) const {
return Node[i];
}
unsigned getNumElements() const {
return Node.size();
}
bool elem_empty() const {
return Node.empty();
}
const_elem_iterator elem_begin() const {
return Node.begin();
}
const_elem_iterator elem_end() const {
return Node.end();
}
/// getType() specialization - Type is always MetadataTy.
///
inline const Type *getType() const {
return Type::MetadataTy;
}
/// isNullValue - Return true if this is the value that would be returned by
/// getNullValue. This always returns false because getNullValue will never
/// produce metadata.
virtual bool isNullValue() const {
return false;
}
/// Profile - calculate a unique identifier for this MDNode to collapse
/// duplicates
void Profile(FoldingSetNodeID &ID) const;
virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
llvm_unreachable(
"This should never be called because NamedMDNodes have no ops");
}
/// 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;
}
};
} // end llvm namespace
#endif
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