IR: Introduce GenericDwarfNode

As part of PR22235, introduce `DwarfNode` and `GenericDwarfNode`.  The
former is a metadata node with a DWARF tag.  The latter matches our
current (generic) schema of a header with string (and stringified
integer) data and an arbitrary number of operands.

This doesn't move it into place yet; that change will require a large
number of testcase updates.

llvm-svn: 226529

1 files changed, 35 insertions, 0 deletions

diff --git a/llvm/unittests/IR/MetadataTest.cpp b/llvm/unittests/IR/MetadataTest.cpp
index 730e8e87943..f2140d62172 100644
--- a/llvm/unittests/IR/MetadataTest.cpp
+++ b/llvm/unittests/IR/MetadataTest.cpp
@@ -561,6 +561,41 @@ TEST_F(MDLocationTest, getTemporary) {
   EXPECT_FALSE(L->isResolved());
 }
 
+typedef MetadataTest GenericDwarfNodeTest;
+
+TEST_F(GenericDwarfNodeTest, get) {
+  auto *Header = MDString::get(Context, "header");
+  auto *Empty = MDNode::get(Context, None);
+  Metadata *Ops1[] = {Empty};
+  auto *N = GenericDwarfNode::get(Context, 15, Header, Ops1);
+  EXPECT_EQ(15u, N->getTag());
+  EXPECT_EQ(2u, N->getNumOperands());
+  EXPECT_EQ(Header, N->getHeader());
+  EXPECT_EQ(Header, N->getOperand(0));
+  EXPECT_EQ(1u, N->getNumDwarfOperands());
+  EXPECT_EQ(Empty, N->getDwarfOperand(0));
+  EXPECT_EQ(Empty, N->getOperand(1));
+  ASSERT_TRUE(N->isUniqued());
+
+  EXPECT_EQ(N, GenericDwarfNode::get(Context, 15, Header, Ops1));
+
+  N->replaceOperandWith(1, nullptr);
+  EXPECT_EQ(15u, N->getTag());
+  EXPECT_EQ(Header, N->getHeader());
+  EXPECT_EQ(nullptr, N->getDwarfOperand(0));
+  ASSERT_TRUE(N->isUniqued());
+
+  Metadata *Ops2[] = {nullptr};
+  EXPECT_EQ(N, GenericDwarfNode::get(Context, 15, Header, Ops2));
+
+  N->replaceDwarfOperandWith(0, Empty);
+  EXPECT_EQ(15u, N->getTag());
+  EXPECT_EQ(Header, N->getHeader());
+  EXPECT_EQ(Empty, N->getDwarfOperand(0));
+  ASSERT_TRUE(N->isUniqued());
+  EXPECT_EQ(N, GenericDwarfNode::get(Context, 15, Header, Ops1));
+}
+
 typedef MetadataTest MetadataAsValueTest;
 
 TEST_F(MetadataAsValueTest, MDNode) {