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Keep track of metadata used by other metadata.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78012 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2009-08-03 22:51:10 +00:00
parent 5e44e472d6
commit 4771e16fa9
2 changed files with 116 additions and 39 deletions
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56
lib/VMCore/Metadata.cpp
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@@ -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();
}