DebugInfo: More accurate line information for placement new.

This actually came up as a break in UBSan tests (look for a follow-up
commit to this one to see the UBSan test fallout) when I tried a broader
fix to location information.

I have some other ideas about how to do that broader change & will keep
looking into it.

llvm-svn: 224221

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGExprCXX.cpp b/clang/lib/CodeGen/CGExprCXX.cpp
index 65e4b2df0db..31f9141eebb 100644
--- a/clang/lib/CodeGen/CGExprCXX.cpp
+++ b/clang/lib/CodeGen/CGExprCXX.cpp
@@ -1269,6 +1269,9 @@ llvm::Value *CodeGenFunction::EmitCXXNewExpr(const CXXNewExpr *E) {
                E->placement_arg_end(), /* CalleeDecl */ nullptr,
                /*ParamsToSkip*/ 1);
 
+  if (auto *DI = getDebugInfo())
+    DI->EmitLocation(Builder, E->getLocStart());
+
   // Emit the allocation call.  If the allocator is a global placement
   // operator, just "inline" it directly.
   RValue RV;