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, metadata !{!"0x102"}), !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, 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 = !{!"0x11\004\00clang version 3.5.0 \000\00\000\00\001", !1, !2, !2, !3, !9, !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/a.cpp] [DW_LANG_C_plus_plus] 72!1 = !{!"a.cpp", !"/tmp/dbginfo"} 73!2 = !{} 74!3 = !{!4} 75!4 = !{!"0x2e\00func\00func\00_Z4funci\001\000\001\000\006\00256\000\001", !1, !5, !6, null, i32 (i32)* @_Z4funci, null, null, !2} ; [ DW_TAG_subprogram ] [line 1] [def] [func] 76!5 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/a.cpp] 77!6 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] 78!7 = !{!8, !8} 79!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] 80!9 = !{!10} 81!10 = !{!"0x34\00x\00x\00\004\000\001", null, !5, !11, i32 (i32)** @x, null} ; [ DW_TAG_variable ] [x] [line 4] [def] 82!11 = !{!"0xf\00\000\0064\0064\000\000", null, null, !6} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ] 83!12 = !{!"0x11\004\00clang version 3.5.0 \000\00\000\00\001", !13, !2, !2, !14, !17, !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/b.cpp] [DW_LANG_C_plus_plus] 84!13 = !{!"b.cpp", !"/tmp/dbginfo"} 85!14 = !{!15} 86!15 = !{!"0x2e\00func\00func\00_Z4funci\001\000\001\000\006\00256\000\001", !13, !16, !6, null, i32 (i32)* @_Z4funci, null, null, !2} ; [ DW_TAG_subprogram ] [line 1] [def] [func] 87!16 = !{!"0x29", !13} ; [ DW_TAG_file_type ] [/tmp/dbginfo/b.cpp] 88!17 = !{!18} 89!18 = !{!"0x34\00y\00y\00\004\000\001", null, !16, !11, i32 (i32)** @y, null} ; [ DW_TAG_variable ] [y] [line 4] [def] 90!19 = !{i32 2, !"Dwarf Version", i32 4} 91!20 = !{i32 1, !"Debug Info Version", i32 2} 92!21 = !{!"clang version 3.5.0 "} 93!22 = !{!"0x101\00i\0016777217\000", !4, !5, !8} ; [ DW_TAG_arg_variable ] [i] [line 1] 94!23 = !MDLocation(line: 1, scope: !4) 95!24 = !MDLocation(line: 2, scope: !4) 96