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6da60093ee
Add an `LLVMContext &` to `ReplaceableMetadataImpl`, create a class that
either holds a reference to an `LLVMContext` or owns a
`ReplaceableMetadataImpl`, and use the new class in `MDNode`.
- This saves a pointer in `UniquableMDNode` at the cost of a pointer
in `ValueAsMetadata` (which didn't used to store the `LLVMContext`).
There are far more of the former.
- Unifies RAUW support between `MDNodeFwdDecl` (which is going away,
see r226481) and `UniquableMDNode`.
llvm-svn: 226484
56 lines
1.7 KiB
C++
56 lines
1.7 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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return N->Context.getReplaceableUses();
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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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