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1; RUN: llc -mtriple=x86_64-apple-darwin -O0 -filetype=obj -o - < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s2; PR33157. Don't crash on duplicate dbg.declare.3; CHECK: DW_TAG_formal_parameter4; CHECK: DW_AT_location [DW_FORM_exprloc]5; CHECK-NOT: DW_AT_location6@g = external global i327@h = external global i328 9declare void @llvm.dbg.declare(metadata, metadata, metadata)10 11define void @f(ptr byval(i32) %p, i1 %c) !dbg !5 {12 br i1 %c, label %x, label %y13 14x:15 call void @llvm.dbg.declare(metadata ptr %p, metadata !10, metadata !DIExpression()), !dbg !1216 store i32 42, ptr @g, !dbg !1217 br label %done18 19y:20 call void @llvm.dbg.declare(metadata ptr %p, metadata !10, metadata !DIExpression()), !dbg !1221 store i32 42, ptr @h, !dbg !1222 br label %done23 24done:25 ret void26}27 28!llvm.dbg.cu = !{!0}29!llvm.module.flags = !{!22, !23}30 31!0 = distinct !DICompileUnit(language: DW_LANG_ObjC, file: !1, producer: "clang version 5.0.0 ", isOptimized: true, runtimeVersion: 2, emissionKind: FullDebug)32!1 = !DIFile(filename: "<stdin>", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")33!5 = distinct !DISubprogram(name: "f", isLocal: true, isDefinition: true, scopeLine: 37, flags: DIFlagPrototyped, isOptimized: true, unit: !0, type: !99, scope: !1)34!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)35!10 = !DILocalVariable(name: "aRect", arg: 1, scope: !11, file: !1, line: 38, type: !6)36!11 = distinct !DILexicalBlock(scope: !98, file: !1, line: 38)37!12 = !DILocation(line: 43, scope: !11, inlinedAt: !13)38!13 = distinct !DILocation(line: 43, scope: !5)39!22 = !{i32 2, !"Dwarf Version", i32 4}40!23 = !{i32 2, !"Debug Info Version", i32 3}41!62 = !{!10}42!98 = distinct !DISubprogram(name: "NSMaxX", scope: !1, file: !1, line: 27, isLocal: true, isDefinition: true, scopeLine: 27, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !62, type: !99)43!99 = !DISubroutineType(types: !100)44!100 = !{null}45