IR: Add MDLocation class

Add a new subclass of `UniquableMDNode`, `MDLocation`.  This will be the
IR version of `DebugLoc` and `DILocation`.  The goal is to rename this
to `DILocation` once the IR classes supersede the `DI`-prefixed
wrappers.

This isn't used anywhere yet.  Part of PR21433.

llvm-svn: 225824

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/unittests/IR/MetadataTest.cpp b/llvm/unittests/IR/MetadataTest.cpp
index 9f5d133943b..8c5c312a2f7 100644
--- a/llvm/unittests/IR/MetadataTest.cpp
+++ b/llvm/unittests/IR/MetadataTest.cpp
@@ -387,6 +387,43 @@ TEST_F(MDNodeTest, replaceResolvedOperand) {
   Temp->replaceAllUsesWith(nullptr);
 }
 
+typedef MetadataTest MDLocationTest;
+
+TEST_F(MDLocationTest, Overflow) {
+  MDNode *N = MDNode::get(Context, None);
+  {
+    MDLocation *L = MDLocation::get(Context, 2, 7, N);
+    EXPECT_EQ(2u, L->getLine());
+    EXPECT_EQ(7u, L->getColumn());
+  }
+  unsigned U24 = 1u << 24;
+  unsigned U8 = 1u << 8;
+  {
+    MDLocation *L = MDLocation::get(Context, U24 - 1, U8 - 1, N);
+    EXPECT_EQ(U24 - 1, L->getLine());
+    EXPECT_EQ(U8 - 1, L->getColumn());
+  }
+  {
+    MDLocation *L = MDLocation::get(Context, U24, U8, N);
+    EXPECT_EQ(0u, L->getLine());
+    EXPECT_EQ(0u, L->getColumn());
+  }
+  {
+    MDLocation *L = MDLocation::get(Context, U24 + 1, U8 + 1, N);
+    EXPECT_EQ(0u, L->getLine());
+    EXPECT_EQ(0u, L->getColumn());
+  }
+}
+
+TEST_F(MDLocationTest, getDistinct) {
+  MDNode *N = MDNode::get(Context, None);
+  MDLocation *L0 = MDLocation::getDistinct(Context, 2, 7, N);
+  EXPECT_TRUE(L0->isDistinct());
+  MDLocation *L1 = MDLocation::get(Context, 2, 7, N);
+  EXPECT_FALSE(L1->isDistinct());
+  EXPECT_EQ(L1, MDLocation::get(Context, 2, 7, N));
+}
+
 typedef MetadataTest MetadataAsValueTest;
 
 TEST_F(MetadataAsValueTest, MDNode) {