DebugInfo: emit the definition of types when construction vtables are required...

DebugInfo: emit the definition of types when construction vtables are required as these types may never end up emitting the full class data

This might be able to be optimized further by only doing this in the
absence of a key function, but it doesn't look like GCC is doing that so
I'm not rushing to do it just yet.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@189022 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGVTables.cpp

@@ -685,6 +685,9 @@ CodeGenVTables::GenerateConstructionVTable(const CXXRecordDecl *RD,
                                       bool BaseIsVirtual, 
                                    llvm::GlobalVariable::LinkageTypes Linkage,
                                       VTableAddressPointsMapTy& AddressPoints) {
+  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
+    DI->completeClassData(Base.getBase());
+
   OwningPtr<VTableLayout> VTLayout(
     VTContext.createConstructionVTableLayout(Base.getBase(),
                                              Base.getBaseOffset(),
@@ -822,15 +825,15 @@ void CodeGenModule::EmitVTable(CXXRecordDecl *theClass, bool isRequired) {
 
 void 
 CodeGenVTables::GenerateClassData(const CXXRecordDecl *RD) {
+  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
+    DI->completeClassData(RD);
+
   if (VFTContext.isValid()) {
     // FIXME: This is a temporary solution to force generation of vftables in
     // Microsoft ABI. Remove when we thread VFTableContext through CodeGen.
     VFTContext->getVFPtrOffsets(RD);
   }
 
-  if (CGDebugInfo *DI = CGM.getModuleDebugInfo())
-    DI->completeClassData(RD);
-
   // First off, check whether we've already emitted the v-table and
   // associated stuff.
   llvm::GlobalVariable *VTable = GetAddrOfVTable(RD);

test/CodeGenCXX/debug-info-class.cpp

@@ -52,6 +52,11 @@ struct G {
   };
 };
 
+struct H {};
+struct I : virtual H {};
+struct J : I {};
+J j;
+
 struct A {
   int one;
   static const int HdrSize = 52;
@@ -103,6 +108,8 @@ int main(int argc, char **argv) {
 // CHECK: [[D_MEM]] = metadata !{metadata [[D_FUNC:![0-9]*]]}
 // CHECK: [[D_FUNC]] = {{.*}} ; [ DW_TAG_subprogram ] {{.*}} [func]
 
+// CHECK: ; [ DW_TAG_structure_type ] [I] {{.*}} [def]
+
 // CHECK: [[F_I_DEF:![0-9]*]] = {{.*}}, metadata [[F_I:![0-9]*]]} ; [ DW_TAG_variable ] [i]
 // CHECK: [[F_I]] = {{.*}} ; [ DW_TAG_member ] [i]
 // CHECK: [[F:![0-9]*]] = {{.*}} metadata [[F_MEM:![0-9]*]], i32 0, null, null} ; [ DW_TAG_structure_type ] [F] {{.*}} [def]
@@ -117,5 +124,5 @@ int main(int argc, char **argv) {
 // CHECK: [[G_INNER_MEM]] = metadata !{metadata [[G_INNER_I:![0-9]*]]}
 // CHECK: [[G_INNER_I]] = {{.*}} ; [ DW_TAG_member ] [j] {{.*}} [from int]
 
-// CHECK: ![[EXCEPTLOC]] = metadata !{i32 79,
-// CHECK: ![[RETLOC]] = metadata !{i32 78,
+// CHECK: ![[EXCEPTLOC]] = metadata !{i32 84,
+// CHECK: ![[RETLOC]] = metadata !{i32 83,