forked from OSchip/llvm-project
82 lines
3.7 KiB
LLVM
82 lines
3.7 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; Built from the following source with clang -O1
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; struct S { int i; };
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; int function(struct S s, int i) { return s.i + i; }
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; Due to the X86_64 ABI, 's' is passed in registers and once optimized, the
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; entirety of 's' is never reconstituted, since only the int is required, and
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; thus the variable's location is unknown/dead to debug info.
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; Future/current work should enable us to describe partial variables, which, in
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; this case, happens to be the entire variable.
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "function"
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "s"
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; CHECK-NOT: DW_TAG
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; FIXME: Even though 's' is never reconstituted into a struct, the one member
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; variable is still live and used, and so we should be able to describe 's's
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; location as the location of that int.
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; CHECK-NOT: DW_AT_location
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; CHECK-NOT: {{DW_TAG|NULL}}
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_location
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name {{.*}} "i"
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%struct.S = type { i32 }
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; Function Attrs: nounwind readnone uwtable
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define i32 @_Z8function1Si(i32 %s.coerce, i32 %i) #0 {
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entry:
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tail call void @llvm.dbg.declare(metadata %struct.S* undef, metadata !14, metadata !{!"0x102"}), !dbg !20
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tail call void @llvm.dbg.value(metadata i32 %i, i64 0, metadata !15, metadata !{!"0x102"}), !dbg !20
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%add = add nsw i32 %i, %s.coerce, !dbg !20
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ret i32 %add, !dbg !20
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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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" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16, !17}
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!llvm.ident = !{!18}
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!0 = !{!"0x11\004\00clang version 3.5.0 \001\00\000\00\001", !1, !2, !3, !8, !2, !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/dead-argument-order.cpp] [DW_LANG_C_plus_plus]
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!1 = !{!"dead-argument-order.cpp", !"/tmp/dbginfo"}
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!2 = !{}
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!3 = !{!4}
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!4 = !{!"0x13\00S\001\0032\0032\000\000\000", !1, null, null, !5, null, null, !"_ZTS1S"} ; [ DW_TAG_structure_type ] [S] [line 1, size 32, align 32, offset 0] [def] [from ]
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!5 = !{!6}
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!6 = !{!"0xd\00i\001\0032\0032\000\000", !1, !"_ZTS1S", !7} ; [ DW_TAG_member ] [i] [line 1, size 32, align 32, offset 0] [from int]
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!7 = !{!"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]
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!8 = !{!9}
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!9 = !{!"0x2e\00function\00function\00_Z8function1Si\002\000\001\000\006\00256\001\002", !1, !10, !11, null, i32 (i32, i32)* @_Z8function1Si, null, null, !13} ; [ DW_TAG_subprogram ] [line 2] [def] [function]
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!10 = !{!"0x29", !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/dead-argument-order.cpp]
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!11 = !{!"0x15\00\000\000\000\000\000\000", i32 0, null, null, !12, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
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!12 = !{!7, !4, !7}
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!13 = !{!14, !15}
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!14 = !{!"0x101\00s\0016777218\000", !9, !10, !"_ZTS1S"} ; [ DW_TAG_arg_variable ] [s] [line 2]
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!15 = !{!"0x101\00i\0033554434\000", !9, !10, !7} ; [ DW_TAG_arg_variable ] [i] [line 2]
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!16 = !{i32 2, !"Dwarf Version", i32 4}
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!17 = !{i32 2, !"Debug Info Version", i32 2}
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!18 = !{!"clang version 3.5.0 "}
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!19 = !{%struct.S* undef}
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!20 = !MDLocation(line: 2, scope: !9)
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