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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(Entry.getKeyData(),
Entry.getKeyLength());
return S;
}
//===----------------------------------------------------------------------===//
//MDNode implementation
//
MDNode::MDNode(Value*const* Vals, unsigned NumVals)
: MetadataBase(Type::MetadataTy, 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(WeakVH(Vals[i]));
}
}
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(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() {
dropAllReferences();
}
//===----------------------------------------------------------------------===//
//NamedMDNode implementation
//
NamedMDNode::NamedMDNode(const Twine &N, MetadataBase*const* MDs,
unsigned NumMDs, Module *ParentModule)
: MetadataBase(Type::MetadataTy, 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);
}
/// 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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