DebugInfo: Correctly identify the location of C++ member initializer list elements

This particularly helps the fidelity of ASan reports (which can occur
even in these examples - if, for example, one uses placement new over a
buffer of insufficient size - now ASan will correctly identify which
member's initialization went over the end of the buffer).

This doesn't cover all types of members - more coming.

llvm-svn: 223726

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 6ced6e18f94..0ce09c8a30f 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1437,7 +1437,11 @@ RValue CodeGenFunction::EmitLoadOfGlobalRegLValue(LValue LV) {
 /// lvalue, where both are guaranteed to the have the same type, and that type
 /// is 'Ty'.
 void CodeGenFunction::EmitStoreThroughLValue(RValue Src, LValue Dst,
-                                             bool isInit) {
+                                             bool isInit,
+                                             SourceLocation DbgLoc) {
+  if (auto *DI = getDebugInfo())
+    DI->EmitLocation(Builder, DbgLoc);
+
   if (!Dst.isSimple()) {
     if (Dst.isVectorElt()) {
       // Read/modify/write the vector, inserting the new element.