1; REQUIRES: object-emission
2
3; RUN: %llc_dwarf < %s -filetype=obj | llvm-dwarfdump -debug-dump=info - | FileCheck %s
4
5; Built with clang from the following source:
6; void f1(int);
7; __attribute__((always_inline)) inline void f2(int i) { f1(i); }
8;
9; #define MULTICALL \
10;   f2(x);          \
11;   f2(y);
12;
13; void f3(int x, int y) { MULTICALL; }
14
15; FIXME: This produces only one inlined_subroutine, with two formal_parameters
16; (both named "this"), one for each of the actual inlined subroutines.  ;
17; Inlined scopes are differentiated by the combination of 'inlined at' (call)
18; location and the location within the function. If two calls to the same
19; function occur at the same location the scopes end up conflated and there
20; appears to be only one inlined function.
21; To fix this, we'd need to add some kind of unique metadata per call site, possibly something like:
22;
23; !42 = !MDLocation(line: 1, scope: !43, inlinedAt: !44)
24; !44 = !MDLocation(line: 2, scope: !45)
25;
26; ->
27;
28; !42 = !MDLocation(line: 1, scope: !43, inlinedAt: !44)
29; !44 = !{!45, !44}
30; !45 = !MDLocation(line: 2, scope: !45)
31;
32; since cycles in metadata are not uniqued, the !44 node would not be shared
33; between calls to the same function from the same location, ensuring separate
34; inlined subroutines would be generated.
35;
36; Once this is done, the (insufficient) hack in clang that adds column
37; information to call sites to differentiate inlined callers can be removed as it
38; will no longer be necessary.
39;
40; While it might be nice to omit the duplicate parameter in this case (while
41; we wait/work on the real fix), it's actually better to leave it in because it
42; allows us to hold the invariant that every DbgVariable has a DIE, every time.
43; This has proved valuable in finding other bugs, so I want to avoid removing the
44; invariant/assertion. Besides, we don't know which one's the right one anyway...
45
46; CHECK: DW_TAG_subprogram
47; CHECK:   DW_TAG_inlined_subroutine
48; CHECK:     DW_TAG_formal_parameter
49; CHECK-NOT: DW_TAG
50; CHECK:     DW_TAG_formal_parameter
51; CHECK-NOT: DW_TAG
52; CHECK:     NULL
53; CHECK-NOT: DW_TAG
54; CHECK:   NULL
55
56; Function Attrs: uwtable
57define void @_Z2f3ii(i32 %x, i32 %y) #0 {
58entry:
59  %i.addr.i1 = alloca i32, align 4
60  %i.addr.i = alloca i32, align 4
61  %x.addr = alloca i32, align 4
62  %y.addr = alloca i32, align 4
63  store i32 %x, i32* %x.addr, align 4
64  call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !15, metadata !16), !dbg !17
65  store i32 %y, i32* %y.addr, align 4
66  call void @llvm.dbg.declare(metadata i32* %y.addr, metadata !18, metadata !16), !dbg !19
67  %0 = load i32* %x.addr, align 4, !dbg !20
68  store i32 %0, i32* %i.addr.i, align 4, !dbg !20
69  call void @llvm.dbg.declare(metadata i32* %i.addr.i, metadata !21, metadata !16), !dbg !22
70  %1 = load i32* %i.addr.i, align 4, !dbg !23
71  call void @_Z2f1i(i32 %1), !dbg !23
72  %2 = load i32* %y.addr, align 4, !dbg !20
73  store i32 %2, i32* %i.addr.i1, align 4, !dbg !20
74  call void @llvm.dbg.declare(metadata i32* %i.addr.i1, metadata !21, metadata !16), !dbg !22
75  %3 = load i32* %i.addr.i1, align 4, !dbg !23
76  call void @_Z2f1i(i32 %3), !dbg !23
77  ret void, !dbg !24
78}
79
80; Function Attrs: nounwind readnone
81declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
82
83declare void @_Z2f1i(i32) #2
84
85attributes #0 = { 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" }
86attributes #1 = { nounwind readnone }
87attributes #2 = { "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" }
88
89!llvm.dbg.cu = !{!0}
90!llvm.module.flags = !{!12, !13}
91!llvm.ident = !{!14}
92
93!0 = !{!"0x11\004\00clang version 3.6.0 \000\00\000\00\001", !1, !2, !2, !3, !2, !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/duplicate_inline.cpp] [DW_LANG_C_plus_plus]
94!1 = !{!"duplicate_inline.cpp", !"/tmp/dbginfo"}
95!2 = !{}
96!3 = !{!4, !9}
97!4 = !{!"0x2e\00f3\00f3\00_Z2f3ii\008\000\001\000\000\00256\000\008", !1, !5, !6, null, void (i32, i32)* @_Z2f3ii, null, null, !2} ; [ DW_TAG_subprogram ] [line 8] [def] [f3]
98!5 = !{!"0x29", !1}    ; [ DW_TAG_file_type ] [/tmp/dbginfo/duplicate_inline.cpp]
99!6 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
100!7 = !{null, !8, !8}
101!8 = !{!"0x24\00int\000\0032\0032\000\000\005", null, null} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
102!9 = !{!"0x2e\00f2\00f2\00_Z2f2i\002\000\001\000\000\00256\000\002", !1, !5, !10, null, null, null, null, !2} ; [ DW_TAG_subprogram ] [line 2] [def] [f2]
103!10 = !{!"0x15\00\000\000\000\000\000\000", null, null, null, !11, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
104!11 = !{null, !8}
105!12 = !{i32 2, !"Dwarf Version", i32 4}
106!13 = !{i32 2, !"Debug Info Version", i32 2}
107!14 = !{!"clang version 3.6.0 "}
108!15 = !{!"0x101\00x\0016777224\000", !4, !5, !8} ; [ DW_TAG_arg_variable ] [x] [line 8]
109!16 = !{!"0x102"}               ; [ DW_TAG_expression ]
110!17 = !MDLocation(line: 8, column: 13, scope: !4)
111!18 = !{!"0x101\00y\0033554440\000", !4, !5, !8} ; [ DW_TAG_arg_variable ] [y] [line 8]
112!19 = !MDLocation(line: 8, column: 20, scope: !4)
113!20 = !MDLocation(line: 8, column: 25, scope: !4)
114!21 = !{!"0x101\00i\0016777218\000", !9, !5, !8} ; [ DW_TAG_arg_variable ] [i] [line 2]
115!22 = !MDLocation(line: 2, column: 51, scope: !9, inlinedAt: !20)
116!23 = !MDLocation(line: 2, column: 56, scope: !9, inlinedAt: !20)
117!24 = !MDLocation(line: 8, column: 36, scope: !4)
118