1; REQUIRES: object-emission
2
3; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
4
5; Testing that two distinct (distinct by writing them in separate files, while
6; still fulfilling C++'s ODR by having identical token sequences) functions,
7; linked under LTO, get plausible debug info (and don't crash).
8
9; Built from source:
10; $ clang++ a.cpp b.cpp -g -c -emit-llvm
11; $ llvm-link a.bc b.bc -o ab.bc
12
13; This change is intended to tickle a case where the subprogram MDNode
14; associated with the llvm::Function will differ from the subprogram
15; referenced by the DbgLocs in the function.
16
17; $ sed -ie "s/!12, !0/!0, !12/" ab.ll
18; $ cat a.cpp
19; inline int func(int i) {
20;   return i * 2;
21; }
22; int (*x)(int) = &func;
23; $ cat b.cpp
24; inline int func(int i) {
25;   return i * 2;
26; }
27; int (*y)(int) = &func;
28
29; CHECK: DW_TAG_compile_unit
30; CHECK:   DW_TAG_subprogram
31; CHECK-NOT: DW_TAG
32; CHECK:     DW_AT_name {{.*}} "func"
33; CHECK: DW_TAG_compile_unit
34
35; FIXME: Maybe we should drop the subprogram here - since the function was
36; emitted in one CU, due to linkonce_odr uniquing. We certainly don't emit the
37; subprogram here if the source location for this definition is the same (see
38; test/DebugInfo/cross-cu-linkonce.ll), though it's very easy to tickle that
39; into failing even without duplicating the source as has been done in this
40; case (two cpp files in different directories, including the same header that
41; contains an inline function - clang will produce distinct subprogram metadata
42; that won't deduplicate owing to the file location information containing the
43; directory of the source file even though the file name is absolute, not
44; relative)
45
46; CHECK: DW_TAG_subprogram
47
48@x = global i32 (i32)* @_Z4funci, align 8
49@y = global i32 (i32)* @_Z4funci, align 8
50
51; Function Attrs: inlinehint nounwind uwtable
52define linkonce_odr i32 @_Z4funci(i32 %i) #0 {
53  %1 = alloca i32, align 4
54  store i32 %i, i32* %1, align 4
55  call void @llvm.dbg.declare(metadata !{i32* %1}, metadata !22), !dbg !23
56  %2 = load i32* %1, align 4, !dbg !24
57  %3 = mul nsw i32 %2, 2, !dbg !24
58  ret i32 %3, !dbg !24
59}
60
61; Function Attrs: nounwind readnone
62declare void @llvm.dbg.declare(metadata, metadata) #1
63
64attributes #0 = { inlinehint nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
65attributes #1 = { nounwind readnone }
66
67!llvm.dbg.cu = !{!12, !0}
68!llvm.module.flags = !{!19, !20}
69!llvm.ident = !{!21, !21}
70
71!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !9, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/a.cpp] [DW_LANG_C_plus_plus]
72!1 = metadata !{metadata !"a.cpp", metadata !"/tmp/dbginfo"}
73!2 = metadata !{}
74!3 = metadata !{metadata !4}
75!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"func", metadata !"func", metadata !"_Z4funci", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z4funci, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [func]
76!5 = metadata !{i32 786473, metadata !1}          ; [ DW_TAG_file_type ] [/tmp/dbginfo/a.cpp]
77!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
78!7 = metadata !{metadata !8, metadata !8}
79!8 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
80!9 = metadata !{metadata !10}
81!10 = metadata !{i32 786484, i32 0, null, metadata !"x", metadata !"x", metadata !"", metadata !5, i32 4, metadata !11, i32 0, i32 1, i32 (i32)** @x, null} ; [ DW_TAG_variable ] [x] [line 4] [def]
82!11 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !6} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
83!12 = metadata !{i32 786449, metadata !13, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !14, metadata !17, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/b.cpp] [DW_LANG_C_plus_plus]
84!13 = metadata !{metadata !"b.cpp", metadata !"/tmp/dbginfo"}
85!14 = metadata !{metadata !15}
86!15 = metadata !{i32 786478, metadata !13, metadata !16, metadata !"func", metadata !"func", metadata !"_Z4funci", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32)* @_Z4funci, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [func]
87!16 = metadata !{i32 786473, metadata !13}        ; [ DW_TAG_file_type ] [/tmp/dbginfo/b.cpp]
88!17 = metadata !{metadata !18}
89!18 = metadata !{i32 786484, i32 0, null, metadata !"y", metadata !"y", metadata !"", metadata !16, i32 4, metadata !11, i32 0, i32 1, i32 (i32)** @y, null} ; [ DW_TAG_variable ] [y] [line 4] [def]
90!19 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
91!20 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
92!21 = metadata !{metadata !"clang version 3.5.0 "}
93!22 = metadata !{i32 786689, metadata !4, metadata !"i", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [i] [line 1]
94!23 = metadata !{i32 1, i32 0, metadata !4, null}
95!24 = metadata !{i32 2, i32 0, metadata !4, null}
96