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IR: Split GenericMDNode into MDTuple and UniquableMDNode

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Split `GenericMDNode` into two classes (with more descriptive names).

  - `UniquableMDNode` will be a common subclass for `MDNode`s that are
    sometimes uniqued like constants, and sometimes 'distinct'.

    This class gets the (short-lived) RAUW support and related API.

  - `MDTuple` is the basic tuple that has always been returned by
    `MDNode::get()`.  This is as opposed to more specific nodes to be
    added soon, which have additional fields, custom assembly syntax,
    and extra semantics.

    This class gets the hash-related logic, since other sublcasses of
    `UniquableMDNode` may need to hash based on other fields.

To keep this diff from getting too big, I've added casts to `MDTuple`
that won't really scale as new subclasses of `UniquableMDNode` are
added, but I'll clean those up incrementally.

(No functionality change intended.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225682 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-01-12 20:09:34 +00:00
parent 2d88dc293b
commit ae9e15f914
10 changed files with 128 additions and 98 deletions
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4
lib/IR/MetadataTracking.cpp
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@ -18,8 +18,8 @@ using namespace llvm;
ReplaceableMetadataImpl *ReplaceableMetadataImpl::get(Metadata &MD) {
if (auto *N = dyn_cast<MDNode>(&MD)) {
if (auto *G = dyn_cast<GenericMDNode>(N))
return G->ReplaceableUses.get();
if (auto *U = dyn_cast<UniquableMDNode>(N))
return U->ReplaceableUses.get();
return cast<MDNodeFwdDecl>(N);
}
return dyn_cast<ValueAsMetadata>(&MD);