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Destroy MDNodes gracefully while deleting llvm context.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96609 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2010-02-18 20:53:16 +00:00
parent 16c1e79cb2
commit 06fdaccc89
3 changed files with 22 additions and 1 deletions
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4
include/llvm/Metadata.h
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@ -75,6 +75,7 @@ class MDNode : public Value, public FoldingSetNode {
MDNode(const MDNode &); // DO NOT IMPLEMENT
void operator=(const MDNode &); // DO NOT IMPLEMENT
friend class MDNodeOperand;
friend class LLVMContextImpl;
/// NumOperands - This many 'MDNodeOperand' items are co-allocated onto the
/// end of this MDNode.
@ -106,6 +107,9 @@ class MDNode : public Value, public FoldingSetNode {
// Replace each instance of F from the operand list of this node with T.
void replaceOperand(MDNodeOperand *Op, Value *NewVal);
~MDNode();
// replaceAllOperandsWithNull - This is used while destroying llvm context to
// gracefully delete all nodes. This method replaces all operands with null.
void replaceAllOperandsWithNull();
protected:
explicit MDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,

12
lib/VMCore/LLVMContextImpl.h
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@ -229,13 +229,23 @@ public:
if (I->second->use_empty())
delete I->second;
}
MDNodeSet.clear();
AlwaysOpaqueTy->dropRef();
for (OpaqueTypesTy::iterator I = OpaqueTypes.begin(), E = OpaqueTypes.end();
I != E; ++I) {
(*I)->AbstractTypeUsers.clear();
delete *I;
}
// Destroy MDNode operands first.
for (FoldingSetIterator<MDNode> I = MDNodeSet.begin(), E = MDNodeSet.end();
I != E;) {
MDNode *N = &(*I);
++I;
N->replaceAllOperandsWithNull();
}
while (!MDNodeSet.empty()) {
MDNode *N = &(*MDNodeSet.begin());
N->destroy();
}
}
};

7
lib/VMCore/Metadata.cpp
View File

@ -257,6 +257,13 @@ void MDNode::Profile(FoldingSetNodeID &ID) const {
ID.AddPointer(getOperand(i));
}
// replaceAllOperandsWithNull - This is used while destroying llvm context to
// gracefully delete all nodes. This method replaces all operands with null.
void MDNode::replaceAllOperandsWithNull() {
for (MDNodeOperand *Op = getOperandPtr(this, 0), *E = Op+NumOperands;
Op != E; ++Op)
replaceOperand(Op, 0);
}
// Replace value from this node's operand list.
void MDNode::replaceOperand(MDNodeOperand *Op, Value *To) {