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IR: Enable uniquing callbacks during MDNode::replaceWithUniqued()

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Uniqued nodes have more complete registration with
`ReplaceableMetadataImpl` so that they can update themselves when
operands change.  Fix a bug where `MDNode::replaceWithUniqued()` wasn't
enabling these callbacks.

The two most obvious ways missing callbacks causes problems is that
auto-resolution fails and re-uniquing (on changed operands) just doesn't
happen.  I've added tests for both -- in both cases, I confirmed that
the final check was failing before the fix.

rdar://problem/20365935

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233751 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-03-31 20:50:50 +00:00
parent d26a5d313c
commit f067a68207
3 changed files with 51 additions and 0 deletions
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4
lib/IR/Metadata.cpp
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@ -446,6 +446,10 @@ void MDNode::makeUniqued() {
assert(isTemporary() && "Expected this to be temporary");
assert(!isResolved() && "Expected this to be unresolved");
// Enable uniquing callbacks.
for (auto &Op : mutable_operands())
Op.reset(Op.get(), this);
// Make this 'uniqued'.
Storage = Uniqued;
if (!countUnresolvedOperands())