1; RUN: llc -filetype=obj -o - < %s | llvm-dwarfdump -debug-info - | FileCheck %s 2; 3; Checks that we're omitting the first range, as it is empty, and that we're 4; emitting one that spans the rest of the function. In this case, the first 5; range, which we omit, describes 8 bytes of the variable using DW_OP_litX, 6; whereas the second one only describes 4 bytes, so clobbering the whole 8 byte 7; fragment with the 4 bytes fragment isn't necessarily best thing to do here, 8; but it is what is currently being emitted. Any change here needs to be 9; intentional, so the test is very specific. 10; 11; The variable is given a single location instead of a location list entry 12; because the function validThroughout has a special code path for single 13; locations with a constant value that start in the prologue. 14; 15; CHECK: DW_TAG_inlined_subroutine 16; CHECK: DW_TAG_variable 17; CHECK-NEXT: DW_AT_location (DW_OP_lit0, DW_OP_stack_value, DW_OP_piece 0x4) 18; CHECK-NEXT DW_AT_name ("i4") 19 20; Created form the following test case (PR26163) with 21; clang -cc1 -triple armv4t--freebsd11.0-gnueabi -emit-obj -debug-info-kind=standalone -O2 -x c test.c 22; 23; typedef unsigned int size_t; 24; struct timeval { 25; long long tv_sec; 26; int tv_usec; 27; }; 28; 29; void *memset(void *, int, size_t); 30; void foo(void); 31; 32; static void 33; bar(int value) 34; { 35; struct timeval lifetime; 36; 37; memset(&lifetime, 0, sizeof(struct timeval)); 38; lifetime.tv_sec = value; 39; 40; foo(); 41; } 42; 43; int 44; parse_config_file(void) 45; { 46; int value; 47; 48; bar(value); 49; return (0); 50; } 51 52target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" 53target triple = "armv4t--freebsd11.0-gnueabi" 54 55%struct.timeval = type { i64, i32 } 56 57declare void @llvm.dbg.declare(metadata, metadata, metadata) 58declare void @llvm.dbg.value(metadata, metadata, metadata) 59 60declare void @foo() 61 62define i32 @parse_config_file() !dbg !4 { 63entry: 64 tail call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !26), !dbg !27 65 tail call void @llvm.dbg.declare(metadata %struct.timeval* undef, metadata !16, metadata !26), !dbg !29 66 tail call void @llvm.dbg.value(metadata i64 0, metadata !16, metadata !30), !dbg !29 67 tail call void @llvm.dbg.value(metadata i32 0, metadata !16, metadata !31), !dbg !29 68 tail call void @foo() #3, !dbg !32 69 ret i32 0, !dbg !33 70} 71 72 73!llvm.dbg.cu = !{!0} 74!llvm.module.flags = !{!22, !23, !24} 75!llvm.ident = !{!25} 76 77!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2) 78!1 = !DIFile(filename: "<stdin>", directory: "/home/ubuntu/bugs") 79!2 = !{} 80!4 = distinct !DISubprogram(name: "parse_config_file", scope: !5, file: !5, line: 22, type: !6, isLocal: false, isDefinition: true, scopeLine: 23, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !9) 81!5 = !DIFile(filename: "test.c", directory: "/home/ubuntu/bugs") 82!6 = !DISubroutineType(types: !7) 83!7 = !{!8} 84!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 85!9 = !{!10} 86!10 = !DILocalVariable(name: "value", scope: !4, file: !5, line: 24, type: !8) 87!11 = distinct !DISubprogram(name: "bar", scope: !5, file: !5, line: 11, type: !12, isLocal: true, isDefinition: true, scopeLine: 12, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !14) 88!12 = !DISubroutineType(types: !13) 89!13 = !{null, !8} 90!14 = !{!15, !16} 91!15 = !DILocalVariable(name: "value", arg: 1, scope: !11, file: !5, line: 11, type: !8) 92!16 = !DILocalVariable(name: "lifetime", scope: !11, file: !5, line: 13, type: !17) 93!17 = !DICompositeType(tag: DW_TAG_structure_type, name: "timeval", file: !5, line: 2, size: 128, align: 64, elements: !18) 94!18 = !{!19, !21} 95!19 = !DIDerivedType(tag: DW_TAG_member, name: "tv_sec", scope: !17, file: !5, line: 3, baseType: !20, size: 64, align: 64) 96!20 = !DIBasicType(name: "long long int", size: 64, align: 64, encoding: DW_ATE_signed) 97!21 = !DIDerivedType(tag: DW_TAG_member, name: "tv_usec", scope: !17, file: !5, line: 4, baseType: !8, size: 32, align: 32, offset: 64) 98!22 = !{i32 2, !"Debug Info Version", i32 3} 99!23 = !{i32 1, !"wchar_size", i32 4} 100!24 = !{i32 1, !"min_enum_size", i32 4} 101!25 = !{!"clang version 3.9.0"} 102!26 = !DIExpression() 103!27 = !DILocation(line: 11, scope: !11, inlinedAt: !28) 104!28 = distinct !DILocation(line: 26, scope: !4) 105!29 = !DILocation(line: 13, scope: !11, inlinedAt: !28) 106!30 = !DIExpression(DW_OP_LLVM_fragment, 0, 64) 107!31 = !DIExpression(DW_OP_LLVM_fragment, 0, 32) 108!32 = !DILocation(line: 18, scope: !11, inlinedAt: !28) 109!33 = !DILocation(line: 27, scope: !4) 110