Verifier: Reject any unknown named MD nodes in the llvm.dbg namespace.

This came out of a discussion in https://reviews.llvm.org/D25285.

There used to be various other llvm.dbg.* nodes, but we don't support
upgrading them and we want to reserve the namespace for future uses.

This also removes an entirely obsolete and bitrotted testcase for PR7662.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283390 91177308-0d34-0410-b5e6-96231b3b80d8

Author: adrian-prantl

lib/IR/Verifier.cpp

@@ -698,10 +698,15 @@ void Verifier::visitGlobalAlias(const GlobalAlias &GA) {
 }
 
 void Verifier::visitNamedMDNode(const NamedMDNode &NMD) {
+  // There used to be various other llvm.dbg.* nodes, but we don't support
+  // upgrading them and we want to reserve the namespace for future uses.
+  if (NMD.getName().startswith("llvm.dbg."))
+    AssertDI(NMD.getName() == "llvm.dbg.cu",
+             "unrecognized named metadata node in the llvm.dbg namespace",
+             &NMD);
   for (const MDNode *MD : NMD.operands()) {
-    if (NMD.getName() == "llvm.dbg.cu") {
+    if (NMD.getName() == "llvm.dbg.cu")
       AssertDI(MD && isa<DICompileUnit>(MD), "invalid compile unit", &NMD, MD);
-    }
 
     if (!MD)
       continue;

test/CodeGen/X86/2010-06-01-DeadArg-DbgInfo.ll

@@ -3,57 +3,49 @@
 ; Test to check that unused argument 'this' is not undefined in debug info.
 
 target triple = "x86_64-apple-darwin10.2"
+
 %struct.foo = type { i32 }
 
-@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 (%struct.foo*, i32)* @_ZN3foo3bazEi to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
+@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 (%struct.foo*, i32)* @_ZN3foo3bazEi to i8*)], section "llvm.metadata"
 
-define i32 @_ZN3foo3bazEi(%struct.foo* nocapture %this, i32 %x) nounwind readnone optsize noinline ssp align 2 !dbg !8 {
-;CHECK: DEBUG_VALUE: baz:this <- %RDI{{$}}
-entry:
-  tail call void @llvm.dbg.value(metadata %struct.foo* %this, i64 0, metadata !15, metadata !DIExpression()), !dbg !DILocation(scope: !8)
-  tail call void @llvm.dbg.value(metadata i32 %x, i64 0, metadata !16, metadata !DIExpression()), !dbg !DILocation(scope: !8)
-  %0 = mul nsw i32 %x, 7, !dbg !29                ; <i32> [#uses=1]
-  %1 = add nsw i32 %0, 1, !dbg !29                ; <i32> [#uses=1]
-  ret i32 %1, !dbg !29
+; Function Attrs: noinline nounwind optsize readnone ssp
+define i32 @_ZN3foo3bazEi(%struct.foo* nocapture %this, i32 %x) #0 align 2 !dbg !4 {
+entry: 
+  ; CHECK: DEBUG_VALUE: baz:this <- %RDI{{$}}
+  tail call void @llvm.dbg.value(metadata %struct.foo* %this, i64 0, metadata !13, metadata !16), !dbg !17
+  tail call void @llvm.dbg.value(metadata i32 %x, i64 0, metadata !18, metadata !16), !dbg !17
+  %0 = mul nsw i32 %x, 7, !dbg !19
+  %1 = add nsw i32 %0, 1, !dbg !19
+  ret i32 %1, !dbg !19
 }
 
-declare void @llvm.dbg.value(metadata, i64, metadata, metadata) nounwind readnone
-
-!llvm.dbg.cu = !{!4}
-!llvm.module.flags = !{!34}
-!llvm.dbg.lv = !{!0, !14, !15, !16, !17, !24, !25, !28}
-
-!0 = !DILocalVariable(name: "this", line: 11, arg: 1, scope: !1, file: !3, type: !12)
-!1 = distinct !DISubprogram(name: "bar", linkageName: "_ZN3foo3barEi", line: 11, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !4, scopeLine: 11, file: !31, scope: !2, type: !9)
-!2 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", line: 3, size: 32, align: 32, file: !31, scope: !3, elements: !5)
-!3 = !DIFile(filename: "foo.cp", directory: "/tmp/")
-!4 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "4.2.1 LLVM build", isOptimized: true, emissionKind: FullDebug, file: !31, enums: !32, retainedTypes: !32)
-!5 = !{!6, !1, !8}
-!6 = !DIDerivedType(tag: DW_TAG_member, name: "y", line: 8, size: 32, align: 32, file: !31, scope: !2, baseType: !7)
-!7 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
-!8 = distinct !DISubprogram(name: "baz", linkageName: "_ZN3foo3bazEi", line: 15, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !4, scopeLine: 15, file: !31, scope: !2, type: !9)
-!9 = !DISubroutineType(types: !10)
-!10 = !{!7, !11, !7}
-!11 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial, file: !31, scope: !3, baseType: !2)
-!12 = !DIDerivedType(tag: DW_TAG_const_type, size: 64, align: 64, flags: DIFlagArtificial, file: !31, scope: !3, baseType: !13)
-!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !31, scope: !3, baseType: !2)
-!14 = !DILocalVariable(name: "x", line: 11, arg: 2, scope: !1, file: !3, type: !7)
-!15 = !DILocalVariable(name: "this", line: 15, arg: 1, scope: !8, file: !3, type: !12)
-!16 = !DILocalVariable(name: "x", line: 15, arg: 2, scope: !8, file: !3, type: !7)
-!17 = !DILocalVariable(name: "argc", line: 19, arg: 1, scope: !18, file: !3, type: !7)
-!18 = distinct !DISubprogram(name: "main", linkageName: "main", line: 19, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !4, scopeLine: 19, file: !31, scope: !3, type: !19)
-!19 = !DISubroutineType(types: !20)
-!20 = !{!7, !7, !21}
-!21 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !31, scope: !3, baseType: !22)
-!22 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, file: !31, scope: !3, baseType: !23)
-!23 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
-!24 = !DILocalVariable(name: "argv", line: 19, arg: 2, scope: !18, file: !3, type: !21)
-!25 = !DILocalVariable(name: "a", line: 20, scope: !26, file: !3, type: !2)
-!26 = distinct !DILexicalBlock(line: 19, column: 0, file: !31, scope: !27)
-!27 = distinct !DILexicalBlock(line: 19, column: 0, file: !31, scope: !18)
-!28 = !DILocalVariable(name: "b", line: 21, scope: !26, file: !3, type: !7)
-!29 = !DILocation(line: 16, scope: !30)
-!30 = distinct !DILexicalBlock(line: 15, column: 0, file: !31, scope: !8)
-!31 = !DIFile(filename: "foo.cp", directory: "/tmp/")
-!32 = !{}
-!34 = !{i32 1, !"Debug Info Version", i32 3}
+; Function Attrs: nounwind readnone
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
+
+attributes #0 = { noinline nounwind optsize readnone ssp }
+attributes #1 = { nounwind readnone }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "4.2.1 LLVM build", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2)
+!1 = !DIFile(filename: "foo.cp", directory: "/tmp/")
+!2 = !{}
+!3 = !{i32 1, !"Debug Info Version", i32 3}
+!4 = distinct !DISubprogram(name: "baz", linkageName: "_ZN3foo3bazEi", scope: !5, file: !1, line: 15, type: !10, isLocal: false, isDefinition: true, scopeLine: 15, virtualIndex: 6, isOptimized: true, unit: !0)
+!5 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", scope: !1, file: !1, line: 3, size: 32, align: 32, elements: !6)
+!6 = !{!7, !9, !4}
+!7 = !DIDerivedType(tag: DW_TAG_member, name: "y", scope: !5, file: !1, line: 8, baseType: !8, size: 32, align: 32)
+!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!9 = distinct !DISubprogram(name: "bar", linkageName: "_ZN3foo3barEi", scope: !5, file: !1, line: 11, type: !10, isLocal: false, isDefinition: true, scopeLine: 11, virtualIndex: 6, isOptimized: true, unit: !0)
+!10 = !DISubroutineType(types: !11)
+!11 = !{!8, !12, !8}
+!12 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !1, file: !1, baseType: !5, size: 64, align: 64, flags: DIFlagArtificial)
+!13 = !DILocalVariable(name: "this", arg: 1, scope: !4, file: !1, line: 15, type: !14)
+!14 = !DIDerivedType(tag: DW_TAG_const_type, scope: !1, file: !1, baseType: !15, size: 64, align: 64, flags: DIFlagArtificial)
+!15 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !1, file: !1, baseType: !5, size: 64, align: 64)
+!16 = !DIExpression()
+!17 = !DILocation(line: 0, scope: !4)
+!18 = !DILocalVariable(name: "x", arg: 2, scope: !4, file: !1, line: 15, type: !8)
+!19 = !DILocation(line: 16, scope: !20)
+!20 = distinct !DILexicalBlock(scope: !4, file: !1, line: 15)