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Keep track of metadata used by other metadata. 

llvm-svn: 78012
This commit is contained in:
Devang Patel 2009-08-03 22:51:10 +00:00
parent 09441faba9
commit d7fd6aba7c
2 changed files with 116 additions and 39 deletions
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99
llvm/include/llvm/Metadata.h
View File

@ -16,7 +16,7 @@
#ifndef LLVM_MDNODE_H
#define LLVM_MDNODE_H
#include "llvm/Value.h"
#include "llvm/User.h"
#include "llvm/Type.h"
#include "llvm/OperandTraits.h"
#include "llvm/ADT/FoldingSet.h"
@ -31,11 +31,17 @@ class LLVMContext;
//===----------------------------------------------------------------------===//
// MetadataBase - A base class for MDNode, MDString and NamedMDNode.
class MetadataBase : public Value {
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)
: Value(Ty, scid) {}
: User(Ty, scid, NULL, 0), ReservedSpace(0) {}
void resizeOperands(unsigned NumOps);
public:
/// getType() specialization - Type is always MetadataTy.
///
@ -64,13 +70,19 @@ public:
/// MDString is always unnamd.
class MDString : public MetadataBase {
MDString(const MDString &); // DO NOT IMPLEMENT
StringRef Str;
void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
unsigned getNumOperands(); // DO NOT IMPLEMENT
StringRef Str;
protected:
explicit MDString(const char *begin, unsigned l)
: MetadataBase(Type::MetadataTy, 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; }
@ -97,38 +109,49 @@ public:
/// 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
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(); }
SmallVector<WeakVH, 4> Node;
typedef SmallVectorImpl<WeakVH>::iterator elem_iterator;
protected:
explicit MDNode(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);
typedef SmallVectorImpl<WeakVH>::const_iterator const_elem_iterator;
/// dropAllReferences - Remove all uses and clear node vector.
void dropAllReferences();
/// ~MDNode - Destroy NamedMDNode.
~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();
}
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();
}
// Element access
typedef SmallVectorImpl<WeakVH>::const_iterator const_elem_iterator;
typedef SmallVectorImpl<WeakVH>::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(); }
/// getType() specialization - Type is always MetadataTy.
///
@ -183,10 +206,13 @@ template<typename ValueSubClass, typename ItemParentClass>
class NamedMDNode : public MetadataBase, public ilist_node<NamedMDNode> {
friend class SymbolTableListTraits<NamedMDNode, Module>;
NamedMDNode(const NamedMDNode &); // DO NOT IMPLEMENT
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;
@ -195,6 +221,10 @@ protected:
explicit NamedMDNode(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(const Twine &N, MetadataBase*const*MDs,
unsigned NumMDs, Module *M = 0) {
return new NamedMDNode(N, MDs, NumMDs, M);
@ -207,39 +237,38 @@ public:
/// dropAllReferences - Remove all uses and clear node vector.
void dropAllReferences();
/// ~NamedMDNode - Destroy NamedMDNode.
~NamedMDNode();
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; }
/// 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));
}
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();
}
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(); }
/// getType() specialization - Type is always MetadataTy.
///

56
llvm/lib/VMCore/Metadata.cpp
View File

@ -18,6 +18,34 @@
#include "SymbolTableListTraitsImpl.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
//MetadataBase implementation
//
/// resizeOperands - Metadata keeps track of other metadata uses using
/// OperandList. Resize this list to hold anticipated number of metadata
/// operands.
void MetadataBase::resizeOperands(unsigned NumOps) {
unsigned e = getNumOperands();
if (NumOps == 0) {
NumOps = e*2;
if (NumOps < 2) NumOps = 2;
} else if (NumOps > NumOperands) {
// No resize needed.
if (ReservedSpace >= NumOps) return;
} else if (NumOps == NumOperands) {
if (ReservedSpace == NumOps) return;
} else {
return;
}
ReservedSpace = NumOps;
Use *OldOps = OperandList;
Use *NewOps = allocHungoffUses(NumOps);
std::copy(OldOps, OldOps + e, NewOps);
OperandList = NewOps;
if (OldOps) Use::zap(OldOps, OldOps + e, true);
}
//===----------------------------------------------------------------------===//
//MDString implementation
//
@ -38,8 +66,14 @@ MDString *MDString::get(LLVMContext &Context, const StringRef &Str) {
//
MDNode::MDNode(Value*const* Vals, unsigned NumVals)
: MetadataBase(Type::MetadataTy, Value::MDNodeVal) {
for (unsigned i = 0; i != NumVals; ++i)
NumOperands = 0;
resizeOperands(NumVals);
for (unsigned i = 0; i != NumVals; ++i) {
// Only record metadata uses.
if (MetadataBase *MB = dyn_cast_or_null<MetadataBase>(Vals[i]))
OperandList[NumOperands++] = MB;
Node.push_back(WeakVH(Vals[i]));
}
}
void MDNode::Profile(FoldingSetNodeID &ID) const {
@ -71,6 +105,15 @@ MDNode *MDNode::get(LLVMContext &Context, Value*const* Vals, unsigned NumVals) {
return N;
}
/// dropAllReferences - Remove all uses and clear node vector.
void MDNode::dropAllReferences() {
User::dropAllReferences();
Node.clear();
}
MDNode::~MDNode() {
dropAllReferences();
}
//===----------------------------------------------------------------------===//
//NamedMDNode implementation
//
@ -78,8 +121,14 @@ NamedMDNode::NamedMDNode(const Twine &N, MetadataBase*const* MDs,
unsigned NumMDs, Module *ParentModule)
: MetadataBase(Type::MetadataTy, Value::NamedMDNodeVal), Parent(0) {
setName(N);
for (unsigned i = 0; i != NumMDs; ++i)
NumOperands = 0;
resizeOperands(NumMDs);
for (unsigned i = 0; i != NumMDs; ++i) {
if (MDs[i])
OperandList[NumOperands++] = MDs[i];
Node.push_back(WeakMetadataVH(MDs[i]));
}
if (ParentModule)
ParentModule->getNamedMDList().push_back(this);
}
@ -87,13 +136,12 @@ NamedMDNode::NamedMDNode(const Twine &N, MetadataBase*const* MDs,
/// eraseFromParent - Drop all references and remove the node from parent
/// module.
void NamedMDNode::eraseFromParent() {
dropAllReferences();
getParent()->getNamedMDList().erase(this);
}
/// dropAllReferences - Remove all uses and clear node vector.
void NamedMDNode::dropAllReferences() {
// FIXME: Update metadata use list.
User::dropAllReferences();
Node.clear();
}