amccarth created this revision.
amccarth added a reviewer: rnk.
amccarth added a subscriber: cfe-commits.
With -debug-info-kind=limited, we omit debug info for abstract classes that
live in other TUs. This reduces duplicate type information. When statically
linked, the type information comes together. But if your binary has a class
derived from a base in a DLL, the base class info is not available to the
debugger.
The decision is made in shouldOmitDefinition (CGDebugInfo.cpp). Per a
suggestion from rnk, I've tweaked the decision so that we do include
definitions for classes marked as DLL imports. This should be a relatively
small number of classes, so we don't pay a large price for duplication of the
type info, yet it should cover most cases on Windows.
Tested manually on Windows. I'm working on a lit test, and I'll update this
patch with it when it's finished.
https://reviews.llvm.org/D23462
Files:
lib/CodeGen/CGDebugInfo.cpp
Index: lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- lib/CodeGen/CGDebugInfo.cpp
+++ lib/CodeGen/CGDebugInfo.cpp
@@ -1685,7 +1685,8 @@
if (!CXXDecl)
return false;
- if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass())
+ if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
+ !CXXDecl->hasAttr<DLLImportAttr>())
return true;
TemplateSpecializationKind Spec = TSK_Undeclared;
Index: lib/CodeGen/CGDebugInfo.cpp
===================================================================
--- lib/CodeGen/CGDebugInfo.cpp
+++ lib/CodeGen/CGDebugInfo.cpp
@@ -1685,7 +1685,8 @@
if (!CXXDecl)
return false;
- if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass())
+ if (CXXDecl->hasDefinition() && CXXDecl->isDynamicClass() &&
+ !CXXDecl->hasAttr<DLLImportAttr>())
return true;
TemplateSpecializationKind Spec = TSK_Undeclared;
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