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Disallow null as a named metadata operand.

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Make MDNode::destroy private.
Fix the one thing that used MDNode::destroy, outside of MDNode itself.

One should never delete or destroy an MDNode explicitly. MDNodes
implicitly go away when there are no references to them (implementation
details aside).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109028 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-07-21 18:54:18 +00:00
parent ec237ffd28
commit 872814ae04
11 changed files with 20 additions and 40 deletions
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4
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@@ -2319,7 +2319,7 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
M->getNamedMetadata(Twine("llvm.dbg.lv.",
getRealLinkageName(F->getName())))) {
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
DIVariable DV(cast_or_null<MDNode>(NMD->getOperand(i)));
DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
if (!DV || !Processed.insert(DV))
continue;
DbgScope *Scope = DbgScopeMap.lookup(DV.getContext());
@@ -2783,7 +2783,7 @@ void DwarfDebug::endFunction(const MachineFunction *MF) {
M->getNamedMetadata(Twine("llvm.dbg.lv.",
getRealLinkageName(FName)))) {
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i) {
DIVariable DV(cast_or_null<MDNode>(NMD->getOperand(i)));
DIVariable DV(cast<MDNode>(NMD->getOperand(i)));
if (!DV || !ProcessedVars.insert(DV))
continue;
DbgScope *Scope = AbstractScopes.lookup(DV.getContext());