Bitcode: Add METADATA_NODE and METADATA_VALUE
This reflects the typelessness of `Metadata` in the bitcode format,
removing types from all metadata operands.
`METADATA_VALUE` represents a `ValueAsMetadata`, and always has two
fields: the type and the value.
`METADATA_NODE` represents an `MDNode`, and unlike `METADATA_OLD_NODE`,
doesn't store types. It stores operands at their ID+1 so that `0` can
reference `nullptr` operands.
Part of PR21532.
llvm-svn: 224073
diff --git a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
index cae20a8..c90dfbd 100644
--- a/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
+++ b/llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
@@ -521,15 +521,9 @@
void ValueEnumerator::EnumerateMDNodeOperands(const MDNode *N) {
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
Metadata *MD = N->getOperand(i);
- if (!MD) {
- EnumerateType(Type::getVoidTy(N->getContext()));
+ if (!MD)
continue;
- }
assert(!isa<LocalAsMetadata>(MD) && "MDNodes cannot be function-local");
- if (auto *C = dyn_cast<ConstantAsMetadata>(MD)) {
- EnumerateValue(C->getValue());
- continue;
- }
EnumerateMetadata(MD);
}
}