1; RUN: llc -mtriple=x86_64-apple-darwin -O0 -filetype=obj -o - < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s 2; RUN: llc --try-experimental-debuginfo-iterators -mtriple=x86_64-apple-darwin -O0 -filetype=obj -o - < %s | llvm-dwarfdump -v -debug-info - | FileCheck %s 3; PR33157. Don't crash on duplicate dbg.declare. 4; CHECK: DW_TAG_formal_parameter 5; CHECK: DW_AT_location [DW_FORM_exprloc] 6; CHECK-NOT: DW_AT_location 7@g = external global i32 8@h = external global i32 9 10declare void @llvm.dbg.declare(metadata, metadata, metadata) 11 12define void @f(ptr byval(i32) %p, i1 %c) !dbg !5 { 13 br i1 %c, label %x, label %y 14 15x: 16 call void @llvm.dbg.declare(metadata ptr %p, metadata !10, metadata !DIExpression()), !dbg !12 17 store i32 42, ptr @g, !dbg !12 18 br label %done 19 20y: 21 call void @llvm.dbg.declare(metadata ptr %p, metadata !10, metadata !DIExpression()), !dbg !12 22 store i32 42, ptr @h, !dbg !12 23 br label %done 24 25done: 26 ret void 27} 28 29!llvm.dbg.cu = !{!0} 30!llvm.module.flags = !{!22, !23} 31 32!0 = distinct !DICompileUnit(language: DW_LANG_ObjC, file: !1, producer: "clang version 5.0.0 ", isOptimized: true, runtimeVersion: 2, emissionKind: FullDebug) 33!1 = !DIFile(filename: "<stdin>", directory: "C:\5Csrc\5Cllvm-project\5Cbuild") 34!5 = distinct !DISubprogram(name: "f", isLocal: true, isDefinition: true, scopeLine: 37, flags: DIFlagPrototyped, isOptimized: true, unit: !0, type: !99, scope: !1) 35!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 36!10 = !DILocalVariable(name: "aRect", arg: 1, scope: !11, file: !1, line: 38, type: !6) 37!11 = distinct !DILexicalBlock(scope: !98, file: !1, line: 38) 38!12 = !DILocation(line: 43, scope: !11, inlinedAt: !13) 39!13 = distinct !DILocation(line: 43, scope: !5) 40!22 = !{i32 2, !"Dwarf Version", i32 4} 41!23 = !{i32 2, !"Debug Info Version", i32 3} 42!62 = !{!10} 43!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) 44!99 = !DISubroutineType(types: !100) 45!100 = !{null} 46