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llvm-6502/test/DebugInfo/missing-abstract-variable.ll
Frederic Riss dd2cb9cae7 [dwarfdump] Resolve also variable specifications/abstract_origins. 
DW_AT_specification and DW_AT_abstract_origin resolving was only performed
on subroutine DIEs because it used the getSubroutineName method. Introduce
a more generic getName() and use it to dump the reference attributes.

Testcases have been updated to check the printed names instead of the offsets
except when the name could be ambiguous.

Reviewers: dblaikie, samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5625

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219506 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-10 15:51:02 +00:00

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; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; The formal parameter 'b' for Function 'x' when inlined within 'a' is lost on
; mips and powerpc64 (and on x86_64 at at least -O2). Presumably this is a
; SelectionDAG issue (do mips/powerpc64 use FastISel?).
; XFAIL: mips, powerpc64, s390x
; Build from the following source with clang -O2.
; The important details are that 'x's abstract definition is first built during
; the definition of 'b', where the parameter to 'x' is constant and so 'x's 's'
; variable is optimized away. No abstract definition DIE for 's' is constructed.
; Then, during 'a' emission, the abstract DbgVariable for 's' is created, but
; the abstract DIE isn't (since the abstract definition for 'b' is already
; built). This results in 's' inlined in 'a' being emitted with its name, line,
; file there, rather than referencing an abstract definition.
; extern int t;
;
; void f(int);
;
; inline void x(bool b) {
; if (b) {
; int s = t;
; f(s);
; }
; f(0);
; }
;
; void b() {
; x(false);
; }
;
; void a(bool u) {
; x(u);
; }
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "x"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "b"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_lexical_block
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_variable
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "s"
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "b"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_inlined_subroutine
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "_Z1xb"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "b"
; Notice 'x's local variable 's' is missing. Not necessarily a bug here,
; since it's been optimized entirely away and it should be described in
; abstract subprogram.
; CHECK-NOT: DW_TAG
; CHECK: NULL
; CHECK-NOT: DW_TAG
; CHECK: NULL
; CHECK: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name {{.*}} "a"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_inlined_subroutine
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "_Z1xb"
; CHECK-NOT: {{DW_TAG|NULL}}
; FIXME: This formal parameter goes missing at least at -O2 (& on
; mips/powerpc), maybe before that. Perhaps SelectionDAG is to blame (and
; fastisel succeeds).
; CHECK: DW_TAG_formal_parameter
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "b"
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_lexical_block
; CHECK-NOT: {{DW_TAG|NULL}}
; CHECK: DW_TAG_variable
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_abstract_origin {{.*}} "s"
@t = external global i32
; Function Attrs: uwtable
define void @_Z1bv() #0 {
entry:
tail call void @llvm.dbg.value(metadata !24, i64 0, metadata !25, metadata !{metadata !"0x102"}), !dbg !27
tail call void @_Z1fi(i32 0), !dbg !28
ret void, !dbg !29
}
; Function Attrs: uwtable
define void @_Z1ab(i1 zeroext %u) #0 {
entry:
tail call void @llvm.dbg.value(metadata !{i1 %u}, i64 0, metadata !13, metadata !{metadata !"0x102"}), !dbg !30
tail call void @llvm.dbg.value(metadata !{i1 %u}, i64 0, metadata !31, metadata !{metadata !"0x102"}), !dbg !33
br i1 %u, label %if.then.i, label %_Z1xb.exit, !dbg !34
if.then.i: ; preds = %entry
%0 = load i32* @t, align 4, !dbg !35, !tbaa !36
tail call void @llvm.dbg.value(metadata !{i32 %0}, i64 0, metadata !40, metadata !{metadata !"0x102"}), !dbg !35
tail call void @_Z1fi(i32 %0), !dbg !41
br label %_Z1xb.exit, !dbg !42
_Z1xb.exit: ; preds = %entry, %if.then.i
tail call void @_Z1fi(i32 0), !dbg !43
ret void, !dbg !44
}
declare void @_Z1fi(i32) #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
attributes #0 = { 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" }
attributes #1 = { "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" }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!21, !22}
!llvm.ident = !{!23}
!0 = metadata !{metadata !"0x11\004\00clang version 3.5.0 \001\00\000\00\001", metadata !1, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/missing-abstract-variables.cc] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"missing-abstract-variables.cc", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4, metadata !8, metadata !14}
!4 = metadata !{metadata !"0x2e\00b\00b\00_Z1bv\0013\000\001\000\006\00256\001\0013", metadata !1, metadata !5, metadata !6, null, void ()* @_Z1bv, null, null, metadata !2} ; [ DW_TAG_subprogram ] [line 13] [def] [b]
!5 = metadata !{metadata !"0x29", metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/missing-abstract-variables.cc]
!6 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !7, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = metadata !{null}
!8 = metadata !{metadata !"0x2e\00a\00a\00_Z1ab\0017\000\001\000\006\00256\001\0017", metadata !1, metadata !5, metadata !9, null, void (i1)* @_Z1ab, null, null, metadata !12} ; [ DW_TAG_subprogram ] [line 17] [def] [a]
!9 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", i32 0, null, null, metadata !10, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!10 = metadata !{null, metadata !11}
!11 = metadata !{metadata !"0x24\00bool\000\008\008\000\000\002", null, null} ; [ DW_TAG_base_type ] [bool] [line 0, size 8, align 8, offset 0, enc DW_ATE_boolean]
!12 = metadata !{metadata !13}
!13 = metadata !{metadata !"0x101\00u\0016777233\000", metadata !8, metadata !5, metadata !11} ; [ DW_TAG_arg_variable ] [u] [line 17]
!14 = metadata !{metadata !"0x2e\00x\00x\00_Z1xb\005\000\001\000\006\00256\001\005", metadata !1, metadata !5, metadata !9, null, null, null, null, metadata !15} ; [ DW_TAG_subprogram ] [line 5] [def] [x]
!15 = metadata !{metadata !16, metadata !17}
!16 = metadata !{metadata !"0x101\00b\0016777221\000", metadata !14, metadata !5, metadata !11} ; [ DW_TAG_arg_variable ] [b] [line 5]
!17 = metadata !{metadata !"0x100\00s\007\000", metadata !18, metadata !5, metadata !20} ; [ DW_TAG_auto_variable ] [s] [line 7]
!18 = metadata !{metadata !"0xb\006\000\000", metadata !1, metadata !19} ; [ DW_TAG_lexical_block ] [/tmp/dbginfo/missing-abstract-variables.cc]
!19 = metadata !{metadata !"0xb\006\000\000", metadata !1, metadata !14} ; [ DW_TAG_lexical_block ] [/tmp/dbginfo/missing-abstract-variables.cc]
!20 = metadata !{metadata !"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]
!21 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!22 = metadata !{i32 2, metadata !"Debug Info Version", i32 2}
!23 = metadata !{metadata !"clang version 3.5.0 "}
!24 = metadata !{i1 false}
!25 = metadata !{metadata !"0x101\00b\0016777221\000", metadata !14, metadata !5, metadata !11, metadata !26} ; [ DW_TAG_arg_variable ] [b] [line 5]
!26 = metadata !{i32 14, i32 0, metadata !4, null}
!27 = metadata !{i32 5, i32 0, metadata !14, metadata !26}
!28 = metadata !{i32 10, i32 0, metadata !14, metadata !26}
!29 = metadata !{i32 15, i32 0, metadata !4, null}
!30 = metadata !{i32 17, i32 0, metadata !8, null}
!31 = metadata !{metadata !"0x101\00b\0016777221\000", metadata !14, metadata !5, metadata !11, metadata !32} ; [ DW_TAG_arg_variable ] [b] [line 5]
!32 = metadata !{i32 18, i32 0, metadata !8, null}
!33 = metadata !{i32 5, i32 0, metadata !14, metadata !32}
!34 = metadata !{i32 6, i32 0, metadata !19, metadata !32}
!35 = metadata !{i32 7, i32 0, metadata !18, metadata !32}
!36 = metadata !{metadata !37, metadata !37, i64 0}
!37 = metadata !{metadata !"int", metadata !38, i64 0}
!38 = metadata !{metadata !"omnipotent char", metadata !39, i64 0}
!39 = metadata !{metadata !"Simple C/C++ TBAA"}
!40 = metadata !{metadata !"0x100\00s\007\000", metadata !18, metadata !5, metadata !20, metadata !32} ; [ DW_TAG_auto_variable ] [s] [line 7]
!41 = metadata !{i32 8, i32 0, metadata !18, metadata !32}
!42 = metadata !{i32 9, i32 0, metadata !18, metadata !32}
!43 = metadata !{i32 10, i32 0, metadata !14, metadata !32}
!44 = metadata !{i32 19, i32 0, metadata !8, null}
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