DebugLocs without a scope should fail the verification.

Follow-up to r226588.

llvm-svn: 226616

llvm/lib/IR/DebugInfo.cpp

@@ -527,15 +527,15 @@ bool DISubprogram::Verify() const {
         while ((IA = DL.getInlinedAt()))
           DL = DebugLoc::getFromDILocation(IA);
         DL.getScopeAndInlinedAt(Scope, IA);
-        assert(Scope && "debug location has no scope");
+        if (!Scope)
+          return false;
         assert(!IA);
         while (!DIDescriptor(Scope).isSubprogram()) {
           DILexicalBlockFile D(Scope);
           Scope = D.isLexicalBlockFile()
                       ? D.getScope()
                       : DebugLoc::getFromDILexicalBlock(Scope).getScope();
-          if (!Scope)
+          assert(Scope && "lexical block file has no scope");
-            llvm_unreachable("lexical block file has no scope");
         }
         if (!DISubprogram(Scope).describes(F))
           return false;

llvm/test/DebugInfo/location-verifier.ll

@@ -0,0 +1,33 @@
+; RUN: not llvm-as -disable-output -verify-debug-info < %s 2>&1 | FileCheck %s
+; ModuleID = 'test.c'
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.10.0"
+
+; Function Attrs: nounwind ssp uwtable
+define i32 @foo() #0 {
+entry:
+  ret i32 42, !dbg !13
+}
+
+attributes #0 = { nounwind ssp uwtable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!9, !10, !11}
+!llvm.ident = !{!12}
+
+!0 = !{!"0x11\0012\00clang version 3.7.0 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/test.c] [DW_LANG_C99]
+!1 = !{!"test.c", !""}
+!2 = !{}
+!3 = !{!4}
+!4 = !{!"0x2e\00foo\00foo\00\001\000\001\000\000\000\000\001", !1, !5, !6, null, i32 ()* @foo, null, null, !2} ; [ DW_TAG_subprogram ] [line 1] [def] [foo]
+!5 = !{!"0x29", !1}                               ; [ DW_TAG_file_type ] [/test.c]
+!6 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
+!7 = !{!8}
+!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
+!9 = !{i32 2, !"Dwarf Version", i32 2}
+!10 = !{i32 2, !"Debug Info Version", i32 2}
+!11 = !{i32 1, !"PIC Level", i32 2}
+!12 = !{!"clang version 3.7.0 "}
+; An old-style MDLocation should not pass verify.
+; CHECK: DISubprogram does not Verify
+!13 = !{i32 2, i32 2, !4, null}