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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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5
include/llvm/IR/Metadata.h
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@@ -761,6 +761,11 @@ protected:
MDOperand *mutable_begin() { return mutable_end() - NumOperands; }
MDOperand *mutable_end() { return reinterpret_cast<MDOperand *>(this); }
typedef iterator_range<MDOperand *> mutable_op_range;
mutable_op_range mutable_operands() {
return mutable_op_range(mutable_begin(), mutable_end());
}
public:
static inline MDTuple *get(LLVMContext &Context, ArrayRef<Metadata *> MDs);
static inline MDTuple *getIfExists(LLVMContext &Context,