Debug Info: Allow a DIModule to appear as the scope of other entities.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247304 91177308-0d34-0410-b5e6-96231b3b80d8

Author: adrian-prantl

lib/CodeGen/AsmPrinter/DwarfUnit.cpp

@@ -693,6 +693,8 @@ DIE *DwarfUnit::getOrCreateContextDIE(const DIScope *Context) {
     return getOrCreateNameSpace(NS);
   if (auto *SP = dyn_cast<DISubprogram>(Context))
     return getOrCreateSubprogramDIE(SP);
+  if (auto *M = dyn_cast<DIModule>(Context))
+    return getOrCreateModule(M);
   return getDIE(Context);
 }
 

test/DebugInfo/X86/DIModuleContext.ll

@@ -0,0 +1,30 @@
+target triple = "x86_64-apple-macosx"
+; RUN: %llc_dwarf %s -o - -filetype=obj \
+; RUN:   | llvm-dwarfdump -debug-dump=info - | FileCheck %s
+; CHECK: DW_TAG_module
+; CHECK-NOT: NULL
+; CHECK: DW_TAG_structure_type
+
+; Hand-crafted based on
+; struct s;
+; struct s *s;
+
+%struct.s = type opaque
+
+@i = common global %struct.s* null, align 8
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!7, !8}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, globals: !3, imports: !11)
+!1 = !DIFile(filename: "test.c", directory: "/")
+!2 = !{}
+!3 = !{!4}
+!4 = !DIGlobalVariable(name: "s", scope: !0, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, variable: %struct.s** @i)
+!5 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64, align: 64)
+!6 = !DICompositeType(tag: DW_TAG_structure_type, name: "s", scope: !9, file: !1, line: 1, flags: DIFlagFwdDecl)
+!7 = !{i32 2, !"Dwarf Version", i32 2}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !DIModule(scope: null, name: "Module", configMacros: "", includePath: ".", isysroot: "/")
+!10 = !DIImportedEntity(tag: DW_TAG_imported_declaration, scope: !0, entity: !9, line: 11)
+!11 = !{!10}