llvm-6502/include/llvm/Metadata.h
Devang Patel e8e0213cc3 Write and read metadata attachments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82259 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-18 19:26:43 +00:00

361 lines
12 KiB
C++

//===-- 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/User.h"
#include "llvm/Type.h"
#include "llvm/OperandTraits.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ValueHandle.h"
namespace llvm {
class Constant;
class Instruction;
class LLVMContext;
//===----------------------------------------------------------------------===//
// MetadataBase - A base class for MDNode, MDString and NamedMDNode.
class MetadataBase : public User {
private:
/// ReservedSpace - The number of operands actually allocated. NumOperands is
/// the number actually in use.
unsigned ReservedSpace;
protected:
MetadataBase(const Type *Ty, unsigned scid)
: User(Ty, scid, NULL, 0), ReservedSpace(0) {}
void resizeOperands(unsigned NumOps);
public:
/// 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 MetadataBase *) { 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
void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
unsigned getNumOperands(); // DO NOT IMPLEMENT
StringRef Str;
protected:
explicit MDString(LLVMContext &C, const char *begin, unsigned l)
: MetadataBase(Type::getMetadataTy(C), Value::MDStringVal), Str(begin, l) {}
public:
// Do not allocate any space for operands.
void *operator new(size_t s) {
return User::operator new(s, 0);
}
static MDString *get(LLVMContext &Context, const StringRef &Str);
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
void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
// getNumOperands - Make this only available for private uses.
unsigned getNumOperands() { return User::getNumOperands(); }
friend class ElementVH;
// Use CallbackVH to hold MDNOde elements.
struct ElementVH : public CallbackVH {
MDNode *Parent;
ElementVH(Value *V, MDNode *P) : CallbackVH(V), Parent(P) {}
~ElementVH() {}
virtual void deleted() {
Parent->replaceElement(this->operator Value*(), 0);
}
virtual void allUsesReplacedWith(Value *NV) {
Parent->replaceElement(this->operator Value*(), NV);
}
};
// Replace each instance of F from the element list of this node with T.
void replaceElement(Value *F, Value *T);
SmallVector<ElementVH, 4> Node;
protected:
explicit MDNode(LLVMContext &C, Value*const* Vals, unsigned NumVals);
public:
// Do not allocate any space for operands.
void *operator new(size_t s) {
return User::operator new(s, 0);
}
// Constructors and destructors.
static MDNode *get(LLVMContext &Context,
Value* const* Vals, unsigned NumVals);
/// dropAllReferences - Remove all uses and clear node vector.
void dropAllReferences();
/// ~MDNode - Destroy MDNode.
~MDNode();
/// getElement - Return specified element.
Value *getElement(unsigned i) const {
assert (getNumElements() > i && "Invalid element number!");
return Node[i];
}
/// getNumElements - Return number of MDNode elements.
unsigned getNumElements() const {
return Node.size();
}
// Element access
typedef SmallVectorImpl<ElementVH>::const_iterator const_elem_iterator;
typedef SmallVectorImpl<ElementVH>::iterator elem_iterator;
/// elem_empty - Return true if MDNode is empty.
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(); }
elem_iterator elem_begin() { return Node.begin(); }
elem_iterator elem_end() { return Node.end(); }
/// 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 dyn_cast_or_null<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>;
friend class LLVMContextImpl;
NamedMDNode(const NamedMDNode &); // DO NOT IMPLEMENT
void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
// getNumOperands - Make this only available for private uses.
unsigned getNumOperands() { return User::getNumOperands(); }
Module *Parent;
SmallVector<WeakMetadataVH, 4> Node;
typedef SmallVectorImpl<WeakMetadataVH>::iterator elem_iterator;
protected:
explicit NamedMDNode(LLVMContext &C, const Twine &N, MetadataBase*const* Vals,
unsigned NumVals, Module *M = 0);
public:
// Do not allocate any space for operands.
void *operator new(size_t s) {
return User::operator new(s, 0);
}
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);
/// eraseFromParent - Drop all references and remove the node from parent
/// module.
void eraseFromParent();
/// dropAllReferences - Remove all uses and clear node vector.
void dropAllReferences();
/// ~NamedMDNode - Destroy NamedMDNode.
~NamedMDNode();
/// 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; }
/// getElement - Return specified element.
MetadataBase *getElement(unsigned i) const {
assert (getNumElements() > i && "Invalid element number!");
return Node[i];
}
/// getNumElements - Return number of NamedMDNode elements.
unsigned getNumElements() const {
return Node.size();
}
/// addElement - Add metadata element.
void addElement(MetadataBase *M) {
resizeOperands(0);
OperandList[NumOperands++] = M;
Node.push_back(WeakMetadataVH(M));
}
typedef SmallVectorImpl<WeakMetadataVH>::const_iterator const_elem_iterator;
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(); }
elem_iterator elem_begin() { return Node.begin(); }
elem_iterator elem_end() { return Node.end(); }
/// 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;
}
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;
}
};
//===----------------------------------------------------------------------===//
/// Metadata -
/// Metadata manages metadata used in a context.
/// MDKindID - This id identifies metadata kind the metadata store. Valid
/// ID values are 1 or higher. This ID is set by RegisterMDKind.
typedef unsigned MDKindID;
class Metadata {
public:
typedef std::pair<MDKindID, WeakVH> MDPairTy;
typedef SmallVector<MDPairTy, 2> MDMapTy;
typedef DenseMap<const Instruction *, MDMapTy> MDStoreTy;
friend class BitcodeReader;
private:
/// MetadataStore - Collection of metadata used in this context.
MDStoreTy MetadataStore;
/// MDHandlerNames - Map to hold metadata handler names.
StringMap<unsigned> MDHandlerNames;
public:
/// RegisterMDKind - Register a new metadata kind and return its ID.
/// A metadata kind can be registered only once.
MDKindID RegisterMDKind(const char *Name);
/// getMDKind - Return metadata kind. If the requested metadata kind
/// is not registered then return 0.
MDKindID getMDKind(const char *Name);
/// getMD - Get the metadata of given kind attached with an Instruction.
/// If the metadata is not found then return 0.
MDNode *getMD(MDKindID Kind, const Instruction *Inst);
/// getMDs - Get the metadata attached with an Instruction.
const MDMapTy *getMDs(const Instruction *Inst);
/// setMD - Attach the metadata of given kind with an Instruction.
void setMD(MDKindID Kind, MDNode *Node, Instruction *Inst);
/// getHandlerNames - Get handler names. This is used by bitcode
/// writer.
const StringMap<unsigned> *getHandlerNames();
/// ValueIsDeleted - This handler is used to update metadata store
/// when a value is deleted.
void ValueIsDeleted(Value *V) {}
void ValueIsDeleted(const Instruction *Inst);
};
} // end llvm namespace
#endif