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IR: Remove MDNodeFwdDecl

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Remove `MDNodeFwdDecl` (as promised in r226481).  Aside from API
changes, there's no real functionality change here.
`MDNode::getTemporary()` now forwards to `MDTuple::getTemporary()`,
which returns a tuple with `isTemporary()` equal to true.

The main point is that we can now add temporaries of other `MDNode`
subclasses, needed for PR22235 (I introduced `MDNodeFwdDecl` in the
first place because I didn't recognize this need, and thought they were
only needed to handle forward references).

A few things left out of (or highlighted by) this commit:

  - I've had to remove the (few) uses of `std::unique_ptr<>` to deal
    with temporaries, since the destructor is no longer public.
    `getTemporary()` should probably return the equivalent of
    `std::unique_ptr<T, MDNode::deleteTemporary>`.
  - `MDLocation::getTemporary()` doesn't exist yet (worse, it actually
    does exist, but does the wrong thing: `MDNode::getTemporary()` is
    inherited and returns an `MDTuple`).
  - `MDNode` now only has one subclass, `UniquableMDNode`, and the
    distinction between them is actually somewhat confusing.

I'll fix those up next.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226501 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-01-19 20:36:39 +00:00
parent dc8beeba1b
commit 8ec0aee3b4
13 changed files with 77 additions and 95 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
lib/Transforms/Utils/InlineFunction.cpp
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@@ -319,11 +319,11 @@ static void CloneAliasScopeMetadata(CallSite CS, ValueToValueMapTy &VMap) {
// Now we have a complete set of all metadata in the chains used to specify
// the noalias scopes and the lists of those scopes.
SmallVector<MDNode *, 16> DummyNodes;
SmallVector<MDTuple *, 16> DummyNodes;
DenseMap<const MDNode *, TrackingMDNodeRef> MDMap;
for (SetVector<const MDNode *>::iterator I = MD.begin(), IE = MD.end();
I != IE; ++I) {
MDNode *Dummy = MDNode::getTemporary(CalledFunc->getContext(), None);
MDTuple *Dummy = MDTuple::getTemporary(CalledFunc->getContext(), None);
DummyNodes.push_back(Dummy);
MDMap[*I].reset(Dummy);
}
@@ -343,7 +343,8 @@ static void CloneAliasScopeMetadata(CallSite CS, ValueToValueMapTy &VMap) {
}
MDNode *NewM = MDNode::get(CalledFunc->getContext(), NewOps);
MDNodeFwdDecl *TempM = cast<MDNodeFwdDecl>(MDMap[*I]);
MDTuple *TempM = cast<MDTuple>(MDMap[*I]);
assert(TempM->isTemporary() && "Expected temporary node");
TempM->replaceAllUsesWith(NewM);
}