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Bitcode: Add METADATA_NODE and METADATA_VALUE

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224073 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-12-11 23:02:24 +00:00
parent f329765d23
commit e39dba9f07
7 changed files with 61 additions and 40 deletions
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8
lib/Bitcode/Writer/ValueEnumerator.cpp
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@@ -521,15 +521,9 @@ void ValueEnumerator::EnumerateNamedMDNode(const NamedMDNode *MD) {
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);
}
}