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 52 define linkonce_odr i32 @_Z4funci(i32 %i) #0 !dbg !4 { 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 !DIExpression()), !dbg !23 56 %2 = load i32, 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 62 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 63 64 attributes #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" } 65 attributes #1 = { nounwind readnone } 66 67 !llvm.dbg.cu = !{!12, !0} 68 !llvm.module.flags = !{!19, !20} 69 !llvm.ident = !{!21, !21} 70 71 !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !9, imports: !2) 72 !1 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo") 73 !2 = !{} 74 !3 = !{!4} 75 !4 = distinct !DISubprogram(name: "func", linkageName: "_Z4funci", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2) 76 !5 = !DIFile(filename: "a.cpp", directory: "/tmp/dbginfo") 77 !6 = !DISubroutineType(types: !7) 78 !7 = !{!8, !8} 79 !8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 80 !9 = !{!10} 81 !10 = !DIGlobalVariable(name: "x", line: 4, isLocal: false, isDefinition: true, scope: null, file: !5, type: !11, variable: i32 (i32)** @x) 82 !11 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !6) 83 !12 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !13, enums: !2, retainedTypes: !2, subprograms: !14, globals: !17, imports: !2) 84 !13 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo") 85 !14 = !{!15} 86 !15 = distinct !DISubprogram(name: "func", linkageName: "_Z4funci", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !13, scope: !16, type: !6, variables: !2) 87 !16 = !DIFile(filename: "b.cpp", directory: "/tmp/dbginfo") 88 !17 = !{!18} 89 !18 = !DIGlobalVariable(name: "y", line: 4, isLocal: false, isDefinition: true, scope: null, file: !16, type: !11, variable: i32 (i32)** @y) 90 !19 = !{i32 2, !"Dwarf Version", i32 4} 91 !20 = !{i32 1, !"Debug Info Version", i32 3} 92 !21 = !{!"clang version 3.5.0 "} 93 !22 = !DILocalVariable(name: "i", line: 1, arg: 1, scope: !4, file: !5, type: !8) 94 !23 = !DILocation(line: 1, scope: !4) 95 !24 = !DILocation(line: 2, scope: !4) 96
