1 ; REQUIRES: object-emission 2 3 ; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s 4 5 ; Built from the following source with clang -O1 6 ; struct S { int i; }; 7 ; int function(struct S s, int i) { return s.i + i; } 8 9 ; Due to the X86_64 ABI, 's' is passed in registers and once optimized, the 10 ; entirety of 's' is never reconstituted, since only the int is required, and 11 ; thus the variable's location is unknown/dead to debug info. 12 13 ; Future/current work should enable us to describe partial variables, which, in 14 ; this case, happens to be the entire variable. 15 16 ; CHECK: DW_TAG_subprogram 17 ; CHECK-NOT: DW_TAG 18 ; CHECK: DW_AT_name {{.*}} "function" 19 ; CHECK-NOT: {{DW_TAG|NULL}} 20 ; CHECK: DW_TAG_formal_parameter 21 ; CHECK-NOT: DW_TAG 22 ; CHECK: DW_AT_name {{.*}} "s" 23 ; CHECK-NOT: DW_TAG 24 ; FIXME: Even though 's' is never reconstituted into a struct, the one member 25 ; variable is still live and used, and so we should be able to describe 's's 26 ; location as the location of that int. 27 ; CHECK-NOT: DW_AT_location 28 ; CHECK-NOT: {{DW_TAG|NULL}} 29 ; CHECK: DW_TAG_formal_parameter 30 ; CHECK-NOT: DW_TAG 31 ; CHECK: DW_AT_location 32 ; CHECK-NOT: DW_TAG 33 ; CHECK: DW_AT_name {{.*}} "i" 34 35 36 %struct.S = type { i32 } 37 38 ; Function Attrs: nounwind readnone uwtable 39 define i32 @_Z8function1Si(i32 %s.coerce, i32 %i) #0 { 40 entry: 41 tail call void @llvm.dbg.declare(metadata %struct.S* undef, metadata !14, metadata !MDExpression()), !dbg !20 42 tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !15, metadata !MDExpression()), !dbg !20 43 %add = add nsw i32 %i, %s.coerce, !dbg !20 44 ret i32 %add, !dbg !20 45 } 46 47 ; Function Attrs: nounwind readnone 48 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 49 50 ; Function Attrs: nounwind readnone 51 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1 52 53 attributes #0 = { nounwind readnone uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 54 attributes #1 = { nounwind readnone } 55 56 !llvm.dbg.cu = !{!0} 57 !llvm.module.flags = !{!16, !17} 58 !llvm.ident = !{!18} 59 60 !0 = !MDCompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !3, subprograms: !8, globals: !2, imports: !2) 61 !1 = !MDFile(filename: "dead-argument-order.cpp", directory: "/tmp/dbginfo") 62 !2 = !{} 63 !3 = !{!4} 64 !4 = !MDCompositeType(tag: DW_TAG_structure_type, name: "S", line: 1, size: 32, align: 32, file: !1, elements: !5, identifier: "_ZTS1S") 65 !5 = !{!6} 66 !6 = !MDDerivedType(tag: DW_TAG_member, name: "i", line: 1, size: 32, align: 32, file: !1, scope: !"_ZTS1S", baseType: !7) 67 !7 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 68 !8 = !{!9} 69 !9 = !MDSubprogram(name: "function", linkageName: "_Z8function1Si", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 2, file: !1, scope: !10, type: !11, function: i32 (i32, i32)* @_Z8function1Si, variables: !13) 70 !10 = !MDFile(filename: "dead-argument-order.cpp", directory: "/tmp/dbginfo") 71 !11 = !MDSubroutineType(types: !12) 72 !12 = !{!7, !4, !7} 73 !13 = !{!14, !15} 74 !14 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "s", line: 2, arg: 1, scope: !9, file: !10, type: !"_ZTS1S") 75 !15 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "i", line: 2, arg: 2, scope: !9, file: !10, type: !7) 76 !16 = !{i32 2, !"Dwarf Version", i32 4} 77 !17 = !{i32 2, !"Debug Info Version", i32 3} 78 !18 = !{!"clang version 3.5.0 "} 79 !19 = !{%struct.S* undef} 80 !20 = !MDLocation(line: 2, scope: !9) 81 82
