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IR: Split MDNode into GenericMDNode and MDNodeFwdDecl

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Split `MDNode` into two classes:

  - `GenericMDNode`, which is uniquable (and for now, always starts
    uniqued).  Once `Metadata` is split from the `Value` hierarchy, this
    class will lose the ability to RAUW itself.

  - `MDNodeFwdDecl`, which is used for the "temporary" interface, is
    never uniqued, and isn't managed by `LLVMContext` at all.

I've left most of the guts in `MDNode` for now, but I'll incrementally
move things to the right places (or delete the functionality, as
appropriate).

Part of PR21532.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222205 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-11-18 00:37:17 +00:00
parent 8ce35351f8
commit 2c38b004d9
5 changed files with 128 additions and 56 deletions
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7
lib/IR/LLVMContextImpl.cpp
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@ -122,13 +122,12 @@ LLVMContextImpl::~LLVMContextImpl() {
// Destroy MDNodes. ~MDNode can move and remove nodes between the MDNodeSet
// and the NonUniquedMDNodes sets, so copy the values out first.
SmallVector<MDNode*, 8> MDNodes;
SmallVector<GenericMDNode *, 8> MDNodes;
MDNodes.reserve(MDNodeSet.size() + NonUniquedMDNodes.size());
MDNodes.append(MDNodeSet.begin(), MDNodeSet.end());
MDNodes.append(NonUniquedMDNodes.begin(), NonUniquedMDNodes.end());
for (SmallVectorImpl<MDNode *>::iterator I = MDNodes.begin(),
E = MDNodes.end(); I != E; ++I)
(*I)->destroy();
for (auto &I : MDNodes)
I->destroy();
assert(MDNodeSet.empty() && NonUniquedMDNodes.empty() &&
"Destroying all MDNodes didn't empty the Context's sets.");