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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
include/llvm/IR/Metadata.h
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@@ -621,6 +621,11 @@ public:
return getMDNode(Context, MDs, false);
}
/// \brief Return a distinct node.
///
/// Return a distinct node -- i.e., a node that is not uniqued.
static MDNode *getDistinct(LLVMContext &Context, ArrayRef<Metadata *> MDs);
/// \brief Return a temporary MDNode
///
/// For use in constructing cyclic MDNode structures. A temporary MDNode is
@@ -700,7 +705,7 @@ public:
/// RAUW. If an operand change (due to RAUW or otherwise) causes a uniquing
/// collision, the uniquing bit is dropped.
///
/// TODO: Make uniquing opt-out (status: mandatory, sometimes dropped).
/// TODO: Make 'distinct' survive across assembly/bitcode/ValueMap.
class GenericMDNode : public MDNode {
friend class Metadata;
friend class MDNode;
@@ -717,7 +722,12 @@ class GenericMDNode : public MDNode {
/// LLVMContext, and adding an LLVMContext reference to RMI.
std::unique_ptr<ReplaceableMetadataImpl> ReplaceableUses;
GenericMDNode(LLVMContext &C, ArrayRef<Metadata *> Vals);
/// \brief Create a new node.
///
/// If \c AllowRAUW, then if any operands are unresolved support RAUW. RAUW
/// will be dropped once all operands have been resolved (or if \a
/// resolveCycles() is called).
GenericMDNode(LLVMContext &C, ArrayRef<Metadata *> Vals, bool AllowRAUW);
~GenericMDNode();
void setHash(unsigned Hash) { MDNodeSubclassData = Hash; }