1; RUN: llc -mtriple=x86_64-pc-linux-gnu -O2 -filetype=obj < %s | llvm-dwarfdump - | FileCheck %s
2
3; This reproducer is based on the following C code:
4;
5; typedef struct { int a; int b; } S;
6;
7; extern int ext(int);
8;
9; int foo() {
10;   S s = {123, 456};
11;   ext(1);
12;   s.a = ext(2);
13;   ext(3);
14;   s.a = 789;
15;   return s.b;
16; }
17;
18; and was generated using -O2 -g -fno-inline.
19;
20; As a small note, the third dbg.value's value has been changed from %call1 to
21; undef (it would have become undef either way, but this was done to make the
22; intention of the test a bit more clear).
23
24; Verify that a location list entry describing s.b is started at the
25; non-overlapping undef debug value.
26
27; CHECK: DW_AT_location (0x00000000
28; CHECK-NEXT: {{0x[0-9a-f]+}}, [[ADDR1:0x[0-9a-f]+]]): DW_OP_constu 0x7b, DW_OP_stack_value, DW_OP_piece 0x4, DW_OP_constu 0x1c8, DW_OP_stack_value, DW_OP_piece 0x4
29; CHECK-NEXT: [[ADDR1]], [[ADDR2:0x[0-9a-f]+]]): DW_OP_piece 0x4, DW_OP_constu 0x1c8, DW_OP_stack_value, DW_OP_piece 0x4
30; CHECK-NEXT: [[ADDR2]], {{0x[0-9a-f]+}}): DW_OP_constu 0x315, DW_OP_stack_value, DW_OP_piece 0x4, DW_OP_constu 0x1c8, DW_OP_stack_value, DW_OP_piece 0x4)
31; CHECK-NEXT: DW_AT_name    ("s")
32
33; Function Attrs: noinline nounwind uwtable
34define i32 @main() !dbg !7 {
35entry:
36  call void @llvm.dbg.value(metadata i32 123, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !18
37  call void @llvm.dbg.value(metadata i32 456, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !18
38  %call = tail call i32 @ext(i32 1), !dbg !19
39  %call1 = tail call i32 @ext(i32 2), !dbg !20
40  call void @llvm.dbg.value(metadata i32 undef, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !18
41  %call2 = tail call i32 @ext(i32 3), !dbg !21
42  call void @llvm.dbg.value(metadata i32 789, metadata !12, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 32)), !dbg !18
43  ret i32 456, !dbg !22
44}
45
46declare i32 @ext(i32)
47
48; Function Attrs: nounwind readnone speculatable
49declare void @llvm.dbg.value(metadata, metadata, metadata) #0
50
51attributes #0 = { nounwind readnone speculatable }
52
53!llvm.dbg.cu = !{!0}
54!llvm.module.flags = !{!3, !4}
55!llvm.ident = !{!6}
56
57!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
58!1 = !DIFile(filename: "undef.c", directory: "/")
59!2 = !{}
60!3 = !{i32 2, !"Dwarf Version", i32 4}
61!4 = !{i32 2, !"Debug Info Version", i32 3}
62!6 = !{!"clang version 9.0.0"}
63!7 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
64!8 = !DISubroutineType(types: !9)
65!9 = !{!10}
66!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
67!11 = !{!12}
68!12 = !DILocalVariable(name: "s", scope: !7, file: !1, line: 6, type: !13)
69!13 = !DIDerivedType(tag: DW_TAG_typedef, name: "S", file: !1, line: 1, baseType: !14)
70!14 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !1, line: 1, size: 64, elements: !15)
71!15 = !{!16, !17}
72!16 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !14, file: !1, line: 1, baseType: !10, size: 32)
73!17 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !14, file: !1, line: 1, baseType: !10, size: 32, offset: 32)
74!18 = !DILocation(line: 6, scope: !7)
75!19 = !DILocation(line: 7, scope: !7)
76!20 = !DILocation(line: 8, scope: !7)
77!21 = !DILocation(line: 9, scope: !7)
78!22 = !DILocation(line: 11, scope: !7)
79