llvm-6502/test/DebugInfo/2010-04-06-NestedFnDbgInfo.ll

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; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj -o - < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; Radar 7833483
; Do not emit a separate out-of-line definition DIE for the function-local 'foo'
; function (member of the function local 'A' type)
; CHECK: DW_TAG_class_type
; CHECK: DW_TAG_class_type
; CHECK-NEXT: DW_AT_name {{.*}} "A"
; Check that the subprogram inside the class definition has low_pc, only
; attached to the definition.
; CHECK: [[FOO_INL:0x........]]: DW_TAG_subprogram
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_low_pc
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_MIPS_linkage_name {{.*}} "_ZZN1B2fnEvEN1A3fooEv"
; And just double check that there's no out of line definition that references
; this subprogram.
; CHECK-NOT: DW_AT_specification {{.*}} {[[FOO_INL]]}
%class.A = type { i8 }
%class.B = type { i8 }
define i32 @main() ssp {
entry:
%retval = alloca i32, align 4 ; <i32*> [#uses=3]
%b = alloca %class.A, align 1 ; <%class.A*> [#uses=1]
store i32 0, i32* %retval
call void @llvm.dbg.declare(metadata !{%class.A* %b}, metadata !0, metadata !{metadata !"0x102"}), !dbg !14
%call = call i32 @_ZN1B2fnEv(%class.A* %b), !dbg !15 ; <i32> [#uses=1]
store i32 %call, i32* %retval, !dbg !15
%0 = load i32* %retval, !dbg !16 ; <i32> [#uses=1]
ret i32 %0, !dbg !16
}
Move the complex address expression out of DIVariable and into an extra argument of the llvm.dbg.declare/llvm.dbg.value intrinsics. Previously, DIVariable was a variable-length field that has an optional reference to a Metadata array consisting of a variable number of complex address expressions. In the case of OpPiece expressions this is wasting a lot of storage in IR, because when an aggregate type is, e.g., SROA'd into all of its n individual members, the IR will contain n copies of the DIVariable, all alike, only differing in the complex address reference at the end. By making the complex address into an extra argument of the dbg.value/dbg.declare intrinsics, all of the pieces can reference the same variable and the complex address expressions can be uniqued across the CU, too. Down the road, this will allow us to move other flags, such as "indirection" out of the DIVariable, too. The new intrinsics look like this: declare void @llvm.dbg.declare(metadata %storage, metadata %var, metadata %expr) declare void @llvm.dbg.value(metadata %storage, i64 %offset, metadata %var, metadata %expr) This patch adds a new LLVM-local tag to DIExpressions, so we can detect and pretty-print DIExpression metadata nodes. What this patch doesn't do: This patch does not touch the "Indirect" field in DIVariable; but moving that into the expression would be a natural next step. http://reviews.llvm.org/D4919 rdar://problem/17994491 Thanks to dblaikie and dexonsmith for reviewing this patch! Note: I accidentally committed a bogus older version of this patch previously. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218787 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-01 18:55:02 +00:00
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
define linkonce_odr i32 @_ZN1B2fnEv(%class.A* %this) ssp align 2 {
entry:
%retval = alloca i32, align 4 ; <i32*> [#uses=2]
%this.addr = alloca %class.A*, align 8 ; <%class.A**> [#uses=2]
%a = alloca %class.A, align 1 ; <%class.A*> [#uses=1]
%i = alloca i32, align 4 ; <i32*> [#uses=2]
store %class.A* %this, %class.A** %this.addr
call void @llvm.dbg.declare(metadata !{%class.A** %this.addr}, metadata !17, metadata !{metadata !"0x102"}), !dbg !18
%this1 = load %class.A** %this.addr ; <%class.A*> [#uses=0]
call void @llvm.dbg.declare(metadata !{%class.A* %a}, metadata !19, metadata !{metadata !"0x102"}), !dbg !27
call void @llvm.dbg.declare(metadata !{i32* %i}, metadata !28, metadata !{metadata !"0x102"}), !dbg !29
%call = call i32 @_ZZN1B2fnEvEN1A3fooEv(%class.A* %a), !dbg !30 ; <i32> [#uses=1]
store i32 %call, i32* %i, !dbg !30
%tmp = load i32* %i, !dbg !31 ; <i32> [#uses=1]
store i32 %tmp, i32* %retval, !dbg !31
%0 = load i32* %retval, !dbg !32 ; <i32> [#uses=1]
ret i32 %0, !dbg !32
}
define internal i32 @_ZZN1B2fnEvEN1A3fooEv(%class.A* %this) ssp align 2 {
entry:
%retval = alloca i32, align 4 ; <i32*> [#uses=2]
%this.addr = alloca %class.A*, align 8 ; <%class.A**> [#uses=2]
store %class.A* %this, %class.A** %this.addr
call void @llvm.dbg.declare(metadata !{%class.A** %this.addr}, metadata !33, metadata !{metadata !"0x102"}), !dbg !34
%this1 = load %class.A** %this.addr ; <%class.A*> [#uses=0]
store i32 42, i32* %retval, !dbg !35
%0 = load i32* %retval, !dbg !35 ; <i32> [#uses=1]
ret i32 %0, !dbg !35
}
!llvm.dbg.cu = !{!4}
!llvm.module.flags = !{!40}
!37 = metadata !{metadata !2, metadata !10, metadata !23}
!0 = metadata !{metadata !"0x100\00b\0016\000", metadata !1, metadata !3, metadata !8} ; [ DW_TAG_auto_variable ]
!1 = metadata !{metadata !"0xb\0015\0012\000", metadata !38, metadata !2} ; [ DW_TAG_lexical_block ]
!2 = metadata !{metadata !"0x2e\00main\00main\00main\0015\000\001\000\006\000\000\0015", metadata !38, metadata !3, metadata !5, null, i32 ()* @main, null, null, null} ; [ DW_TAG_subprogram ]
!3 = metadata !{metadata !"0x29", metadata !38} ; [ DW_TAG_file_type ]
!4 = metadata !{metadata !"0x11\004\00clang 1.5\000\00\000\00\000", metadata !38, metadata !39, metadata !39, metadata !37, null, null} ; [ DW_TAG_compile_unit ]
!5 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !38, metadata !3, null, metadata !6, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!6 = metadata !{metadata !7}
!7 = metadata !{metadata !"0x24\00int\000\0032\0032\000\000\005", metadata !38, metadata !3} ; [ DW_TAG_base_type ]
!8 = metadata !{metadata !"0x2\00B\002\008\008\000\000\000", metadata !38, metadata !3, null, metadata !9, null, null, null} ; [ DW_TAG_class_type ] [B] [line 2, size 8, align 8, offset 0] [def] [from ]
!9 = metadata !{metadata !10}
!10 = metadata !{metadata !"0x2e\00fn\00fn\00_ZN1B2fnEv\004\000\001\000\006\000\000\004", metadata !38, metadata !8, metadata !11, null, i32 (%class.A*)* @_ZN1B2fnEv, null, null, null} ; [ DW_TAG_subprogram ]
!11 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !38, metadata !3, null, metadata !12, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!12 = metadata !{metadata !7, metadata !13}
!13 = metadata !{metadata !"0xf\00\000\0064\0064\000\0064", metadata !38, metadata !3, metadata !8} ; [ DW_TAG_pointer_type ]
!14 = metadata !{i32 16, i32 5, metadata !1, null}
!15 = metadata !{i32 17, i32 3, metadata !1, null}
!16 = metadata !{i32 18, i32 1, metadata !2, null}
!17 = metadata !{metadata !"0x101\00this\004\000", metadata !10, metadata !3, metadata !13} ; [ DW_TAG_arg_variable ]
!18 = metadata !{i32 4, i32 7, metadata !10, null}
!19 = metadata !{metadata !"0x100\00a\009\000", metadata !20, metadata !3, metadata !21} ; [ DW_TAG_auto_variable ]
!20 = metadata !{metadata !"0xb\004\0012\000", metadata !38, metadata !10} ; [ DW_TAG_lexical_block ]
!21 = metadata !{metadata !"0x2\00A\005\008\008\000\000\000", metadata !38, metadata !10, null, metadata !22, null, null, null} ; [ DW_TAG_class_type ] [A] [line 5, size 8, align 8, offset 0] [def] [from ]
!22 = metadata !{metadata !23}
!23 = metadata !{metadata !"0x2e\00foo\00foo\00_ZZN1B2fnEvEN1A3fooEv\007\000\001\000\006\000\000\007", metadata !38, metadata !21, metadata !24, null, i32 (%class.A*)* @_ZZN1B2fnEvEN1A3fooEv, null, null, null} ; [ DW_TAG_subprogram ]
!24 = metadata !{metadata !"0x15\00\000\000\000\000\000\000", metadata !38, metadata !3, null, metadata !25, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!25 = metadata !{metadata !7, metadata !26}
!26 = metadata !{metadata !"0xf\00\000\0064\0064\000\0064", metadata !38, metadata !3, metadata !21} ; [ DW_TAG_pointer_type ]
!27 = metadata !{i32 9, i32 7, metadata !20, null}
!28 = metadata !{metadata !"0x100\00i\0010\000", metadata !20, metadata !3, metadata !7} ; [ DW_TAG_auto_variable ]
!29 = metadata !{i32 10, i32 9, metadata !20, null}
!30 = metadata !{i32 10, i32 5, metadata !20, null}
!31 = metadata !{i32 11, i32 5, metadata !20, null}
!32 = metadata !{i32 12, i32 3, metadata !10, null}
!33 = metadata !{metadata !"0x101\00this\007\000", metadata !23, metadata !3, metadata !26} ; [ DW_TAG_arg_variable ]
!34 = metadata !{i32 7, i32 11, metadata !23, null}
!35 = metadata !{i32 7, i32 19, metadata !36, null}
!36 = metadata !{metadata !"0xb\007\0017\000", metadata !38, metadata !23} ; [ DW_TAG_lexical_block ]
!38 = metadata !{metadata !"one.cc", metadata !"/tmp" }
!39 = metadata !{i32 0}
!40 = metadata !{i32 1, metadata !"Debug Info Version", i32 2}