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IR: Add MDNode::getDistinct()

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Allow distinct `MDNode`s to be explicitly created.  There's no way (yet)
of representing their distinctness in assembly/bitcode, however, so this
still isn't first-class.

Part of PR22111.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225406 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-01-07 22:24:46 +00:00
parent a3ee583339
commit 727176d00e
3 changed files with 62 additions and 4 deletions
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14
lib/IR/Metadata.cpp
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@@ -411,8 +411,12 @@ static bool isOperandUnresolved(Metadata *Op) {
return false;
}
GenericMDNode::GenericMDNode(LLVMContext &C, ArrayRef<Metadata *> Vals)
GenericMDNode::GenericMDNode(LLVMContext &C, ArrayRef<Metadata *> Vals,
bool AllowRAUW)
: MDNode(C, GenericMDNodeKind, Vals) {
if (!AllowRAUW)
return;
// Check whether any operands are unresolved, requiring re-uniquing.
for (const auto &Op : operands())
if (isOperandUnresolved(Op))
@@ -581,12 +585,18 @@ MDNode *MDNode::getMDNode(LLVMContext &Context, ArrayRef<Metadata *> MDs,
return nullptr;
// Coallocate space for the node and Operands together, then placement new.
GenericMDNode *N = new (MDs.size()) GenericMDNode(Context, MDs);
auto *N = new (MDs.size()) GenericMDNode(Context, MDs, /* AllowRAUW */ true);
N->setHash(Key.Hash);
Store.insert(N);
return N;
}
MDNode *MDNode::getDistinct(LLVMContext &Context, ArrayRef<Metadata *> MDs) {
auto *N = new (MDs.size()) GenericMDNode(Context, MDs, /* AllowRAUW */ false);
N->storeDistinctInContext();
return N;
}
MDNodeFwdDecl *MDNode::getTemporary(LLVMContext &Context,
ArrayRef<Metadata *> MDs) {
MDNodeFwdDecl *N = new (MDs.size()) MDNodeFwdDecl(Context, MDs);