Debug Info: When building a module, emit skeleton CUs for imported modules.

llvm-svn: 248184

2 files changed, 15 insertions, 9 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 6af8d6626b4..ae1f5e7ecfa 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -2161,7 +2161,14 @@ ObjCInterfaceDecl *CGDebugInfo::getObjCInterfaceDecl(QualType Ty) {
 
 llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
   ExternalASTSource::ASTSourceDescriptor Info;
-  if (ClangModuleMap) {
+  if (DebugTypeExtRefs && D->isFromASTFile()) {
+    // Record a reference to an imported clang module or precompiled header.
+    auto *Reader = CGM.getContext().getExternalSource();
+    auto Idx = D->getOwningModuleID();
+    auto Info = Reader->getSourceDescriptor(Idx);
+    if (Info)
+      return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
+  } else if (ClangModuleMap) {
     // We are building a clang module or a precompiled header.
     //
     // TODO: When D is a CXXRecordDecl or a C++ Enum, the ODR applies
@@ -2179,14 +2186,6 @@ llvm::DIModule *CGDebugInfo::getParentModuleOrNull(const Decl *D) {
     }
   }
 
-  if (DebugTypeExtRefs && D->isFromASTFile()) {
-    // Record a reference to an imported clang module or precompiled header.
-    auto *Reader = CGM.getContext().getExternalSource();
-    auto Idx = D->getOwningModuleID();
-    auto Info = Reader->getSourceDescriptor(Idx);
-    if (Info)
-      return getOrCreateModuleRef(*Info, /*SkeletonCU=*/true);
-  }
   return nullptr;
 }
 
diff --git a/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp b/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
index 1673340a495..310e374e348 100644
--- a/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
+++ b/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
@@ -67,6 +67,13 @@ class PCHContainerGenerator : public ASTConsumer {
       return !Ty->isDependentType() && !Ty->isUndeducedType();
     }
 
+    bool VisitImportDecl(ImportDecl *D) {
+      auto *Import = cast<ImportDecl>(D);
+      if (!Import->getImportedOwningModule())
+        DI.EmitImportDecl(*Import);
+      return true;
+    }
+
     bool VisitTypeDecl(TypeDecl *D) {
       QualType QualTy = Ctx.getTypeDeclType(D);
       if (!QualTy.isNull() && CanRepresent(QualTy.getTypePtr()))