Include debug info for types referenced only via explicit cast expressions.

Most of the debug info emission is powered essentially from function
definitions - if we emit the definition of a function, we emit the types
of its parameters, the members of those types, and so on and so forth.

For types that aren't referenced even indirectly due to this - because
they only appear in temporary expressions, not in any named variable, we
need to explicitly emit/add them as is done here. This is not the only
case of such code, and we might want to consider handling "void
func(void*); ... func(new T());" (currently debug info for T is not
emitted) at some point, though GCC doesn't. There's a much broader
solution to these issues, but it's a lot of work for possibly marginal
gain (but might help us improve the default -fno-standalone-debug
behavior to be even more aggressive in some places). See the original
review thread for more details.

Patch by jyoti allur (jyoti.yalamanchili@gmail.com)!

Differential Revision: http://reviews.llvm.org/D2498

llvm-svn: 218390

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index 5abe80f1900..207f98f85f1 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -274,6 +274,10 @@ public:
   Value *VisitExplicitCastExpr(ExplicitCastExpr *E) {
     if (E->getType()->isVariablyModifiedType())
       CGF.EmitVariablyModifiedType(E->getType());
+
+    if (CGDebugInfo *DI = CGF.getDebugInfo())
+      DI->EmitExplicitCastType(E->getType());
+
     return VisitCastExpr(E);
   }
   Value *VisitCastExpr(CastExpr *E);