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//===-- Metadata.cpp - Implement Metadata classes -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Metadata classes.
//
//===----------------------------------------------------------------------===//
#include "LLVMContextImpl.h"
#include "llvm/Metadata.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#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
//
MDString *MDString::get(LLVMContext &Context, const StringRef &Str) {
LLVMContextImpl *pImpl = Context.pImpl;
sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
StringMapEntry<MDString *> &Entry =
pImpl->MDStringCache.GetOrCreateValue(Str);
MDString *&S = Entry.getValue();
if (!S) S = new MDString(Context, Entry.getKeyData(),
Entry.getKeyLength());
return S;
}
//===----------------------------------------------------------------------===//
//MDNode implementation
//
MDNode::MDNode(LLVMContext &C, Value*const* Vals, unsigned NumVals)
: MetadataBase(Type::getMetadataTy(C), Value::MDNodeVal) {
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(ElementVH(Vals[i], this));
}
}
void MDNode::Profile(FoldingSetNodeID &ID) const {
for (const_elem_iterator I = elem_begin(), E = elem_end(); I != E; ++I)
ID.AddPointer(*I);
}
MDNode *MDNode::get(LLVMContext &Context, Value*const* Vals, unsigned NumVals) {
LLVMContextImpl *pImpl = Context.pImpl;
FoldingSetNodeID ID;
for (unsigned i = 0; i != NumVals; ++i)
ID.AddPointer(Vals[i]);
pImpl->ConstantsLock.reader_acquire();
void *InsertPoint;
MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
pImpl->ConstantsLock.reader_release();
if (!N) {
sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!N) {
// InsertPoint will have been set by the FindNodeOrInsertPos call.
N = new MDNode(Context, Vals, NumVals);
pImpl->MDNodeSet.InsertNode(N, InsertPoint);
}
}
return N;
}
/// dropAllReferences - Remove all uses and clear node vector.
void MDNode::dropAllReferences() {
User::dropAllReferences();
Node.clear();
}
MDNode::~MDNode() {
getType()->getContext().pImpl->MDNodeSet.RemoveNode(this);
dropAllReferences();
}
// Replace value from this node's element list.
void MDNode::replaceElement(Value *From, Value *To) {
if (From == To || !getType())
return;
LLVMContext &Context = getType()->getContext();
LLVMContextImpl *pImpl = Context.pImpl;
// Find value. This is a linear search, do something if it consumes
// lot of time. It is possible that to have multiple instances of
// From in this MDNode's element list.
SmallVector<unsigned, 4> Indexes;
unsigned Index = 0;
for (SmallVector<ElementVH, 4>::iterator I = Node.begin(),
E = Node.end(); I != E; ++I, ++Index) {
Value *V = *I;
if (V && V == From)
Indexes.push_back(Index);
}
if (Indexes.empty())
return;
// Remove "this" from the context map.
{
sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
pImpl->MDNodeSet.RemoveNode(this);
}
// Replace From element(s) in place.
for (SmallVector<unsigned, 4>::iterator I = Indexes.begin(), E = Indexes.end();
I != E; ++I) {
unsigned Index = *I;
Node[Index] = ElementVH(To, this);
}
// Insert updated "this" into the context's folding node set.
// If a node with same element list already exist then before inserting
// updated "this" into the folding node set, replace all uses of existing
// node with updated "this" node.
FoldingSetNodeID ID;
Profile(ID);
pImpl->ConstantsLock.reader_acquire();
void *InsertPoint;
MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
pImpl->ConstantsLock.reader_release();
if (N) {
N->replaceAllUsesWith(this);
delete N;
N = 0;
}
{
sys::SmartScopedWriter<true> Writer(pImpl->ConstantsLock);
N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
if (!N) {
// InsertPoint will have been set by the FindNodeOrInsertPos call.
N = this;
pImpl->MDNodeSet.InsertNode(N, InsertPoint);
}
}
}
//===----------------------------------------------------------------------===//
//NamedMDNode implementation
//
NamedMDNode::NamedMDNode(LLVMContext &C, const Twine &N,
MetadataBase*const* MDs,
unsigned NumMDs, Module *ParentModule)
: MetadataBase(Type::getMetadataTy(C), Value::NamedMDNodeVal), Parent(0) {
setName(N);
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);
}
NamedMDNode *NamedMDNode::Create(const NamedMDNode *NMD, Module *M) {
assert (NMD && "Invalid source NamedMDNode!");
SmallVector<MetadataBase *, 4> Elems;
for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i)
Elems.push_back(NMD->getElement(i));
return new NamedMDNode(NMD->getContext(), NMD->getName().data(),
Elems.data(), Elems.size(), M);
}
/// eraseFromParent - Drop all references and remove the node from parent
/// module.
void NamedMDNode::eraseFromParent() {
getParent()->getNamedMDList().erase(this);
}
/// dropAllReferences - Remove all uses and clear node vector.
void NamedMDNode::dropAllReferences() {
User::dropAllReferences();
Node.clear();
}
NamedMDNode::~NamedMDNode() {
dropAllReferences();
}
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