Module Debugging: Emit forward declarations for types that are defined in

clang modules, if -dwarf-ext-refs (DebugTypesExtRefs) is specified.

This reimplements r247369 in about a third of the amount of code.
Thanks to David Blaikie pointing this out in post-commit review!

llvm-svn: 247432

1 files changed, 69 insertions, 0 deletions

diff --git a/clang/test/Modules/ExtDebugInfo.cpp b/clang/test/Modules/ExtDebugInfo.cpp
new file mode 100644
index 00000000000..91b9a770e67
--- /dev/null
+++ b/clang/test/Modules/ExtDebugInfo.cpp
@@ -0,0 +1,69 @@
+// RUN: rm -rf %t
+// Test that only forward declarations are emitted for types dfined in modules.
+
+// Modules:
+// RUN: %clang_cc1 -x objective-c++ -std=c++11 -g -dwarf-ext-refs -fmodules \
+// RUN:     -fmodule-format=obj -fimplicit-module-maps -DMODULES \
+// RUN:     -fmodules-cache-path=%t %s -I %S/Inputs -I %t -emit-llvm -o %t-mod.ll
+// RUN: cat %t-mod.ll |  FileCheck %s
+
+// PCH:
+// RUN: %clang_cc1 -x c++ -std=c++11 -fmodule-format=obj -emit-pch -I%S/Inputs \
+// RUN:     -o %t.pch %S/Inputs/DebugCXX.h
+// RUN: %clang_cc1 -std=c++11 -g -dwarf-ext-refs -fmodule-format=obj \
+// RUN:     -include-pch %t.pch %s -emit-llvm -o %t-pch.ll %s
+// RUN: cat %t-pch.ll |  FileCheck %s
+
+#ifdef MODULES
+@import DebugCXX;
+#endif
+
+using DebugCXX::Struct;
+
+Struct s;
+DebugCXX::Enum e;
+DebugCXX::Template<long> implicitTemplate;
+DebugCXX::Template<int> explicitTemplate;
+DebugCXX::FloatInstatiation typedefTemplate;
+int Struct::static_member = -1;
+enum {
+  e3 = -1
+} conflicting_uid = e3;
+auto anon_enum = DebugCXX::e2;
+char _anchor = anon_enum + conflicting_uid;
+
+// CHECK: ![[NS:.*]] = !DINamespace(name: "DebugCXX", scope: ![[MOD:[0-9]+]],
+// CHECK: ![[MOD]] = !DIModule(scope: null, name: {{.*}}DebugCXX
+
+// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "Struct",
+// CHECK-SAME:             scope: ![[NS]],
+// CHECK-SAME:             flags: DIFlagFwdDecl,
+// CHECK-SAME:             identifier: "_ZTSN8DebugCXX6StructE")
+
+// CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, name: "Enum",
+// CHECK-SAME:             scope: ![[NS]],
+// CHECK-SAME:             flags: DIFlagFwdDecl,
+// CHECK-SAME:             identifier:  "_ZTSN8DebugCXX4EnumE")
+
+// CHECK: !DICompositeType(tag: DW_TAG_class_type,
+
+// CHECK: !DICompositeType(tag: DW_TAG_class_type,
+// CHECK-SAME:             name: "Template<int, DebugCXX::traits<int> >",
+// CHECK-SAME:             scope: ![[NS]],
+// CHECK-SAME:             flags: DIFlagFwdDecl,
+// CHECK-SAME:             identifier: "_ZTSN8DebugCXX8TemplateIiNS_6traitsIiEEEE")
+
+// CHECK: !DICompositeType(tag: DW_TAG_class_type,
+// CHECK-SAME:             name: "Template<float, DebugCXX::traits<float> >",
+// CHECK-SAME:             scope: ![[NS]],
+// CHECK-SAME:             flags: DIFlagFwdDecl,
+// CHECK-SAME:             identifier: "_ZTSN8DebugCXX8TemplateIfNS_6traitsIfEEEE")
+
+// CHECK: !DIDerivedType(tag: DW_TAG_member, name: "static_member",
+// CHECK-SAME:           scope: !"_ZTSN8DebugCXX6StructE"
+
+// CHECK: !DIGlobalVariable(name: "anon_enum", {{.*}}, type: ![[ANON_ENUM:[0-9]+]]
+// CHECK: !DICompositeType(tag: DW_TAG_enumeration_type, scope: ![[NS]],
+// CHECK-SAME:             line: 16
+
+// CHECK: !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !0, entity: !"_ZTSN8DebugCXX6StructE", line: 21)