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 !19, metadata !14), !dbg !20 42 tail call void @llvm.dbg.value(metadata !{i32 %i}, i64 0, metadata !15), !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) #1 49 50 ; Function Attrs: nounwind readnone 51 declare void @llvm.dbg.value(metadata, i64, 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 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 true, metadata !"", i32 0, metadata !2, metadata !3, metadata !8, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/dead-argument-order.cpp] [DW_LANG_C_plus_plus] 61 !1 = metadata !{metadata !"dead-argument-order.cpp", metadata !"/tmp/dbginfo"} 62 !2 = metadata !{} 63 !3 = metadata !{metadata !4} 64 !4 = metadata !{i32 786451, metadata !1, null, metadata !"S", i32 1, i64 32, i64 32, i32 0, i32 0, null, metadata !5, i32 0, null, null, metadata !"_ZTS1S"} ; [ DW_TAG_structure_type ] [S] [line 1, size 32, align 32, offset 0] [def] [from ] 65 !5 = metadata !{metadata !6} 66 !6 = metadata !{i32 786445, metadata !1, metadata !"_ZTS1S", metadata !"i", i32 1, i64 32, i64 32, i64 0, i32 0, metadata !7} ; [ DW_TAG_member ] [i] [line 1, size 32, align 32, offset 0] [from int] 67 !7 = 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] 68 !8 = metadata !{metadata !9} 69 !9 = metadata !{i32 786478, metadata !1, metadata !10, metadata !"function", metadata !"function", metadata !"_Z8function1Si", i32 2, metadata !11, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 (i32, i32)* @_Z8function1Si, null, null, metadata !13, i32 2} ; [ DW_TAG_subprogram ] [line 2] [def] [function] 70 !10 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/dead-argument-order.cpp] 71 !11 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !12, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ] 72 !12 = metadata !{metadata !7, metadata !4, metadata !7} 73 !13 = metadata !{metadata !14, metadata !15} 74 !14 = metadata !{i32 786689, metadata !9, metadata !"s", metadata !10, i32 16777218, metadata !"_ZTS1S", i32 0, i32 0} ; [ DW_TAG_arg_variable ] [s] [line 2] 75 !15 = metadata !{i32 786689, metadata !9, metadata !"i", metadata !10, i32 33554434, metadata !7, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [i] [line 2] 76 !16 = metadata !{i32 2, metadata !"Dwarf Version", i32 4} 77 !17 = metadata !{i32 2, metadata !"Debug Info Version", i32 1} 78 !18 = metadata !{metadata !"clang version 3.5.0 "} 79 !19 = metadata !{%struct.S* undef} 80 !20 = metadata !{i32 2, i32 0, metadata !9, null} 81 82