1; REQUIRES: object-emission
2
3; Check that when variables are allocated on the stack we generate debug locations
4; for the stack location directly instead of generating a register+offset indirection.
5
6; RUN: llc -O2 -filetype=obj -disable-post-ra -mtriple=x86_64-unknown-linux-gnu < %s \
7; RUN: | llvm-dwarfdump -v - | FileCheck %s
8;
9; int data = 17;
10; int sum  = 0;
11; int zero = 0;
12; int *ptr;
13;
14; extern void foo(int i, int *p);
15;
16; int main()
17; {
18;   int val;
19;   val = data;
20;   foo(1, &val);
21;   foo(2, &data);
22;   return zero;
23; }
24;
25; CHECK:      .debug_info contents
26; CHECK:      DW_TAG_subprogram
27; CHECK-NOT:  NULL
28; CHECK:      DW_TAG_variable
29; CHECK:      DW_AT_location [DW_FORM_sec_offset] ({{.*}}
30; CHECK-NEXT:   [{{0x.*}}, {{0x.*}}): DW_OP_reg0 RAX
31;
32; Note: This is a location, so we don't want an extra DW_OP_deref at the end.
33; LLDB gets the location right without it:
34;     Variable:  ... name = "val", type = "int", location =  [rsp+4], decl = frame.c:10
35; Adding the deref actually creates an invalid location:
36;     ... [rsp+4] DW_OP_deref
37;
38; CHECK-NEXT:   [{{0x.*}}, {{0x.*}}): DW_OP_breg7 RSP+4)
39; CHECK-NEXT: DW_AT_name {{.*}}"val"
40
41; ModuleID = 'frame.c'
42source_filename = "frame.c"
43
44@data = global i32 17, align 4, !dbg !0
45@sum = local_unnamed_addr global i32 0, align 4, !dbg !6
46@zero = local_unnamed_addr global i32 0, align 4, !dbg !9
47@ptr = common local_unnamed_addr global i32* null, align 8, !dbg !11
48
49define i32 @main() local_unnamed_addr !dbg !17 {
50entry:
51  %val = alloca i32, align 4
52  %0 = bitcast i32* %val to i8*, !dbg !22
53  call void @llvm.lifetime.start(i64 4, i8* %0), !dbg !22
54  %1 = load i32, i32* @data, align 4, !dbg !23, !tbaa !24
55  tail call void @llvm.dbg.value(metadata i32 %1, metadata !21, metadata !28), !dbg !29
56  store i32 %1, i32* %val, align 4, !dbg !30, !tbaa !24
57  tail call void @llvm.dbg.value(metadata i32* %val, metadata !21, metadata !31), !dbg !29
58  call void @foo(i32 1, i32* nonnull %val), !dbg !32
59  call void @foo(i32 2, i32* nonnull @data), !dbg !33
60  %2 = load i32, i32* @zero, align 4, !dbg !34, !tbaa !24
61  call void @llvm.lifetime.end(i64 4, i8* %0), !dbg !35
62  ret i32 %2, !dbg !36
63}
64
65; Function Attrs: argmemonly nounwind
66declare void @llvm.lifetime.start(i64, i8* nocapture) #0
67
68declare void @foo(i32, i32*) local_unnamed_addr
69
70; Function Attrs: argmemonly nounwind
71declare void @llvm.lifetime.end(i64, i8* nocapture) #0
72
73; Function Attrs: nounwind readnone
74declare void @llvm.dbg.value(metadata, metadata, metadata) #1
75
76attributes #0 = { argmemonly nounwind }
77attributes #1 = { nounwind readnone }
78
79!llvm.dbg.cu = !{!2}
80!llvm.module.flags = !{!14, !15}
81!llvm.ident = !{!16}
82
83!0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
84!1 = !DIGlobalVariable(name: "data", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
85!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.9.0 (trunk 273961)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
86!3 = !DIFile(filename: "frame.c", directory: "/home/user/test")
87!4 = !{}
88!5 = !{!0, !6, !9, !11}
89!6 = distinct !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
90!7 = !DIGlobalVariable(name: "sum", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
91!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
92!9 = distinct !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
93!10 = !DIGlobalVariable(name: "zero", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true)
94!11 = distinct !DIGlobalVariableExpression(var: !12, expr: !DIExpression())
95!12 = !DIGlobalVariable(name: "ptr", scope: !2, file: !3, line: 4, type: !13, isLocal: false, isDefinition: true)
96!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64, align: 64)
97!14 = !{i32 2, !"Dwarf Version", i32 4}
98!15 = !{i32 2, !"Debug Info Version", i32 3}
99!16 = !{!"clang version 3.9.0 (trunk 273961)"}
100!17 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 8, type: !18, isLocal: false, isDefinition: true, scopeLine: 9, isOptimized: true, unit: !2, retainedNodes: !20)
101!18 = !DISubroutineType(types: !19)
102!19 = !{!8}
103!20 = !{!21}
104!21 = !DILocalVariable(name: "val", scope: !17, file: !3, line: 10, type: !8)
105!22 = !DILocation(line: 10, column: 3, scope: !17)
106!23 = !DILocation(line: 11, column: 9, scope: !17)
107!24 = !{!25, !25, i64 0}
108!25 = !{!"int", !26, i64 0}
109!26 = !{!"omnipotent char", !27, i64 0}
110!27 = !{!"Simple C/C++ TBAA"}
111!28 = !DIExpression()
112!29 = !DILocation(line: 10, column: 7, scope: !17)
113!30 = !DILocation(line: 11, column: 7, scope: !17)
114!31 = !DIExpression(DW_OP_deref)
115!32 = !DILocation(line: 12, column: 3, scope: !17)
116!33 = !DILocation(line: 13, column: 3, scope: !17)
117!34 = !DILocation(line: 14, column: 10, scope: !17)
118!35 = !DILocation(line: 15, column: 1, scope: !17)
119!36 = !DILocation(line: 14, column: 3, scope: !17)
120
121