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IR: Add MDNode::isDistinct()

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Add API to indicate whether an `MDNode` is distinct.  A distinct node is
not stored in the MDNode uniquing tables, and will never be returned by
`MDNode::get()`.

Although distinct nodes are only currently created by uniquing
collisions (when operands change), PR22111 will allow these nodes to be
explicitly created.

llvm-svn: 225401
This commit is contained in:
Duncan P. N. Exon Smith 2015-01-07 21:35:38 +00:00
parent b85a13e7a0
commit 60c042ccb4
2 changed files with 33 additions and 0 deletions
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6
include/llvm/IR/Metadata.h
View File

@ -642,6 +642,12 @@ public:
/// \brief Check if node is fully resolved.
bool isResolved() const;
/// \brief Check if node is distinct.
///
/// Distinct nodes are not uniqued, and will not be returned by \a
/// MDNode::get().
bool isDistinct() const { return IsDistinctInContext; }
protected:
/// \brief Set an operand.
///

27
unittests/IR/MetadataTest.cpp
View File

@ -222,6 +222,33 @@ TEST_F(MDNodeTest, NullOperand) {
EXPECT_EQ(N, NullOp);
}
TEST_F(MDNodeTest, DistinctOnUniquingCollision) {
// !{}
MDNode *Empty = MDNode::get(Context, None);
ASSERT_TRUE(Empty->isResolved());
EXPECT_FALSE(Empty->isDistinct());
// !{!{}}
Metadata *Wrapped1Ops[] = {Empty};
MDNode *Wrapped1 = MDNode::get(Context, Wrapped1Ops);
ASSERT_EQ(Empty, Wrapped1->getOperand(0));
ASSERT_TRUE(Wrapped1->isResolved());
EXPECT_FALSE(Wrapped1->isDistinct());
// !{!{!{}}}
Metadata *Wrapped2Ops[] = {Wrapped1};
MDNode *Wrapped2 = MDNode::get(Context, Wrapped2Ops);
ASSERT_EQ(Wrapped1, Wrapped2->getOperand(0));
ASSERT_TRUE(Wrapped2->isResolved());
EXPECT_FALSE(Wrapped2->isDistinct());
// !{!{!{}}} => !{!{}}
Wrapped2->replaceOperandWith(0, Empty);
ASSERT_EQ(Empty, Wrapped2->getOperand(0));
EXPECT_TRUE(Wrapped2->isDistinct());
EXPECT_FALSE(Wrapped1->isDistinct());
}
typedef MetadataTest MetadataAsValueTest;
TEST_F(MetadataAsValueTest, MDNode) {