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ae9e15f914
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
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
//===- MetadataTracking.cpp - Implement metadata tracking -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements Metadata tracking.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/MetadataTracking.h"
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#include "llvm/IR/Metadata.h"
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using namespace llvm;
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ReplaceableMetadataImpl *ReplaceableMetadataImpl::get(Metadata &MD) {
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if (auto *N = dyn_cast<MDNode>(&MD)) {
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if (auto *U = dyn_cast<UniquableMDNode>(N))
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return U->ReplaceableUses.get();
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return cast<MDNodeFwdDecl>(N);
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}
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return dyn_cast<ValueAsMetadata>(&MD);
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}
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bool MetadataTracking::track(void *Ref, Metadata &MD, OwnerTy Owner) {
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assert(Ref && "Expected live reference");
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assert((Owner || *static_cast<Metadata **>(Ref) == &MD) &&
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"Reference without owner must be direct");
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if (auto *R = ReplaceableMetadataImpl::get(MD)) {
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R->addRef(Ref, Owner);
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return true;
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}
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return false;
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}
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void MetadataTracking::untrack(void *Ref, Metadata &MD) {
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assert(Ref && "Expected live reference");
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if (auto *R = ReplaceableMetadataImpl::get(MD))
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R->dropRef(Ref);
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}
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bool MetadataTracking::retrack(void *Ref, Metadata &MD, void *New) {
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assert(Ref && "Expected live reference");
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assert(New && "Expected live reference");
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assert(Ref != New && "Expected change");
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if (auto *R = ReplaceableMetadataImpl::get(MD)) {
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R->moveRef(Ref, New, MD);
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return true;
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}
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return false;
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}
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bool MetadataTracking::isReplaceable(const Metadata &MD) {
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return ReplaceableMetadataImpl::get(const_cast<Metadata &>(MD));
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}
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