[ASTImporter] Copy Argument Passing Restrictions setting when importing a CXXRecordDecl definition

Summary:
For a CXXRecordDecl the RecordDeclBits are stored in the DeclContext. Currently when we import the definition of a CXXRecordDecl via the ASTImporter we do not copy over this data.
This change will add support for copying the ArgPassingRestrictions from RecordDeclBits to fix an LLDB expression parsing bug where we would set it to not pass in registers.
Note, we did not copy over any other of the RecordDeclBits since we don't have tests for those. We know that copying over LoadedFieldsFromExternalStorage would be a error and that may be the case for others as well.

The companion LLDB review: https://reviews.llvm.org/D61146

Differential Review: https://reviews.llvm.org/D61140

llvm-svn: 359338

3 files changed, 26 insertions, 0 deletions

diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index db956561e93..b4c04284055 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -1767,6 +1767,9 @@ Error ASTNodeImporter::ImportDefinition(
     ToData.HasDeclaredCopyAssignmentWithConstParam
       = FromData.HasDeclaredCopyAssignmentWithConstParam;
 
+    // Copy over the data stored in RecordDeclBits
+    ToCXX->setArgPassingRestrictions(FromCXX->getArgPassingRestrictions());
+
     SmallVector<CXXBaseSpecifier *, 4> Bases;
     for (const auto &Base1 : FromCXX->bases()) {
       ExpectedType TyOrErr = import(Base1.getType());
diff --git a/clang/test/Import/cxx-record-flags/Inputs/F.cpp b/clang/test/Import/cxx-record-flags/Inputs/F.cpp
new file mode 100644
index 00000000000..1294c67f68d
--- /dev/null
+++ b/clang/test/Import/cxx-record-flags/Inputs/F.cpp
@@ -0,0 +1,9 @@
+class FTrivial {
+  int i;
+};
+
+struct FNonTrivial {
+  virtual ~FNonTrivial() = default;
+  int i;
+};
+
diff --git a/clang/test/Import/cxx-record-flags/test.cpp b/clang/test/Import/cxx-record-flags/test.cpp
new file mode 100644
index 00000000000..bff76274fba
--- /dev/null
+++ b/clang/test/Import/cxx-record-flags/test.cpp
@@ -0,0 +1,14 @@
+// RUN: clang-import-test -dump-ast -import %S/Inputs/F.cpp -expression %s | FileCheck %s
+
+// CHECK: FTrivial
+// CHECK: DefinitionData
+// CHECK-SAME: pass_in_registers
+
+// CHECK: FNonTrivial
+// CHECK-NOT: pass_in_registers
+// CHECK: DefaultConstructor
+
+void expr() {
+  FTrivial f1;
+  FNonTrivial f2;
+}