mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-11 05:35:11 +00:00
641414a6c0
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`. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226484 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
//===- MetadataTracking.cpp - Implement metadata tracking -----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements Metadata tracking.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/IR/MetadataTracking.h"
|
|
#include "llvm/IR/Metadata.h"
|
|
|
|
using namespace llvm;
|
|
|
|
ReplaceableMetadataImpl *ReplaceableMetadataImpl::get(Metadata &MD) {
|
|
if (auto *N = dyn_cast<MDNode>(&MD))
|
|
return N->Context.getReplaceableUses();
|
|
return dyn_cast<ValueAsMetadata>(&MD);
|
|
}
|
|
|
|
bool MetadataTracking::track(void *Ref, Metadata &MD, OwnerTy Owner) {
|
|
assert(Ref && "Expected live reference");
|
|
assert((Owner || *static_cast<Metadata **>(Ref) == &MD) &&
|
|
"Reference without owner must be direct");
|
|
if (auto *R = ReplaceableMetadataImpl::get(MD)) {
|
|
R->addRef(Ref, Owner);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void MetadataTracking::untrack(void *Ref, Metadata &MD) {
|
|
assert(Ref && "Expected live reference");
|
|
if (auto *R = ReplaceableMetadataImpl::get(MD))
|
|
R->dropRef(Ref);
|
|
}
|
|
|
|
bool MetadataTracking::retrack(void *Ref, Metadata &MD, void *New) {
|
|
assert(Ref && "Expected live reference");
|
|
assert(New && "Expected live reference");
|
|
assert(Ref != New && "Expected change");
|
|
if (auto *R = ReplaceableMetadataImpl::get(MD)) {
|
|
R->moveRef(Ref, New, MD);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool MetadataTracking::isReplaceable(const Metadata &MD) {
|
|
return ReplaceableMetadataImpl::get(const_cast<Metadata &>(MD));
|
|
}
|