1; RUN: %llc_dwarf %s -o - -filetype=obj | llvm-dwarfdump - | FileCheck %s -implicit-check-not=DW_TAG
2;
3; This tests that we do not create concrete variable DIEs for variables that
4; have no location -- for both ways that LLVM-IR can express a variable with
5; no location. It's possible to:
6;   1) Omit all dbg.values and place the variable in the subprograms retained
7;      nodes list,
8;   2) Have a dbg.value with an undef operand, and none with "real" operands.
9; Both of these should produce the same DWARF. In the two functions below
10; (qux and croix) I've modified the IR to represent both scenarios.
11;
12; Original C, LLVM-IR modified afterwards:
13;
14; int foo(int bar) {
15;   int baz = 12 + bar;
16;   return baz;
17; }
18;
19; int qux(int quux) {
20;   int xyzzy = foo(quux);
21;   return xyzzy;
22; }
23;
24; int croix(int quux) {
25;   int xyzzy = foo(quux);
26;   return xyzzy;
27; }
28;
29;; Note the implicit DW_TAG check-not in the FileCheck command line.
30; CHECK: DW_TAG_compile_unit
31;;
32;; First subprogram is attached to the plain "foo" function in the output
33;; object. It should have locations for the two variables in the function,
34;; let's be non-specific as to how.
35; CHECK:     DW_TAG_subprogram
36; CHECK:       DW_AT_abstract_origin (0x{{[0-9a-f]*}} "foo")
37; CHECK:       DW_TAG_formal_parameter
38; CHECK:         DW_AT_location
39; CHECK:       DW_TAG_variable
40; CHECK:         DW_AT_location
41;
42;; Abstract subprogram; should have plain variable declarations
43; CHECK:     DW_TAG_subprogram
44; CHECK:       DW_AT_name ("foo")
45; CHECK:       DW_TAG_formal_parameter
46; CHECK:         DW_AT_name ("bar")
47; CHECK:       DW_TAG_variable
48; CHECK:         DW_AT_name ("baz")
49;
50; CHECK:     DW_TAG_base_type
51;
52;; The copy of "foo" inlined into "qux" should have no children.
53; CHECK:     DW_TAG_subprogram
54; CHECK:       DW_AT_name ("qux")
55; CHECK:       DW_TAG_formal_parameter
56; CHECK:       DW_TAG_variable
57; CHECK:       DW_TAG_inlined_subroutine
58; CHECK:     NULL
59;
60;; Same for the copy of foo inlined into "croix"
61; CHECK:     DW_TAG_subprogram
62; CHECK:       DW_AT_name ("croix")
63; CHECK:       DW_TAG_formal_parameter
64; CHECK:       DW_TAG_variable
65; CHECK:       DW_TAG_inlined_subroutine
66; CHECK:     NULL
67
68; Function Attrs: norecurse nounwind readnone uwtable willreturn
69define dso_local i32 @foo(i32 %bar) local_unnamed_addr !dbg !7 {
70entry:
71  call void @llvm.dbg.value(metadata i32 %bar, metadata !12, metadata !DIExpression()), !dbg !14
72  %add = add nsw i32 %bar, 12, !dbg !15
73  call void @llvm.dbg.value(metadata i32 %add, metadata !13, metadata !DIExpression()), !dbg !14
74  ret i32 %add, !dbg !16
75}
76
77; Function Attrs: norecurse nounwind readnone uwtable willreturn
78define dso_local i32 @qux(i32 %quux) local_unnamed_addr !dbg !17 {
79entry:
80  %add.i = add nsw i32 %quux, 12, !dbg !24
81  ret i32 %add.i, !dbg !25
82}
83
84; Function Attrs: norecurse nounwind readnone uwtable willreturn
85define dso_local i32 @croix(i32 %quux) local_unnamed_addr !dbg !26 {
86entry:
87  call void @llvm.dbg.value(metadata i32 undef, metadata !28, metadata !DIExpression()), !dbg !30
88  call void @llvm.dbg.value(metadata i32 undef, metadata !12, metadata !DIExpression()), !dbg !31
89  %add.i = add nsw i32 %quux, 12, !dbg !33
90  call void @llvm.dbg.value(metadata i32 undef, metadata !13, metadata !DIExpression()), !dbg !31
91  call void @llvm.dbg.value(metadata i32 undef, metadata !29, metadata !DIExpression()), !dbg !30
92  ret i32 %add.i, !dbg !34
93}
94
95; Function Attrs: nofree nosync nounwind readnone speculatable willreturn
96declare void @llvm.dbg.value(metadata, metadata, metadata)
97
98!llvm.dbg.cu = !{!0}
99!llvm.module.flags = !{!3, !4, !5}
100!llvm.ident = !{!6}
101
102!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
103!1 = !DIFile(filename: "test.c", directory: ".")
104!2 = !{}
105!3 = !{i32 7, !"Dwarf Version", i32 4}
106!4 = !{i32 2, !"Debug Info Version", i32 3}
107!5 = !{i32 1, !"wchar_size", i32 4}
108!6 = !{!"clang"}
109!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !8, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
110!8 = !DISubroutineType(types: !9)
111!9 = !{!10, !10}
112!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
113!11 = !{!12, !13}
114!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 1, type: !10)
115!13 = !DILocalVariable(name: "baz", scope: !7, file: !1, line: 2, type: !10)
116!14 = !DILocation(line: 0, scope: !7)
117!15 = !DILocation(line: 2, column: 16, scope: !7)
118!16 = !DILocation(line: 3, column: 3, scope: !7)
119!17 = distinct !DISubprogram(name: "qux", scope: !1, file: !1, line: 6, type: !8, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !18)
120!18 = !{!19, !20}
121!19 = !DILocalVariable(name: "quux", arg: 1, scope: !17, file: !1, line: 6, type: !10)
122!20 = !DILocalVariable(name: "xyzzy", scope: !17, file: !1, line: 7, type: !10)
123!21 = !DILocation(line: 0, scope: !17)
124!22 = !DILocation(line: 0, scope: !7, inlinedAt: !23)
125!23 = distinct !DILocation(line: 7, column: 15, scope: !17)
126!24 = !DILocation(line: 2, column: 16, scope: !7, inlinedAt: !23)
127!25 = !DILocation(line: 8, column: 3, scope: !17)
128!26 = distinct !DISubprogram(name: "croix", scope: !1, file: !1, line: 11, type: !8, scopeLine: 11, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !27)
129!27 = !{!28, !29}
130!28 = !DILocalVariable(name: "quux", arg: 1, scope: !26, file: !1, line: 11, type: !10)
131!29 = !DILocalVariable(name: "xyzzy", scope: !26, file: !1, line: 12, type: !10)
132!30 = !DILocation(line: 0, scope: !26)
133!31 = !DILocation(line: 0, scope: !7, inlinedAt: !32)
134!32 = distinct !DILocation(line: 12, column: 15, scope: !26)
135!33 = !DILocation(line: 2, column: 16, scope: !7, inlinedAt: !32)
136!34 = !DILocation(line: 13, column: 3, scope: !26)
137