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llvm-6502/test/DebugInfo/X86/dbg-declare-arg.ll
Adrian Prantl 02474a32eb 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

128 lines
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; RUN: llc -O0 -fast-isel=false < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-macosx10.6.7"
;Radar 9321650
;CHECK: ##DEBUG_VALUE: my_a
%class.A = type { i32, i32, i32, i32 }
define void @_Z3fooi(%class.A* sret %agg.result, i32 %i) ssp {
entry:
%i.addr = alloca i32, align 4
%j = alloca i32, align 4
%nrvo = alloca i1
%cleanup.dest.slot = alloca i32
store i32 %i, i32* %i.addr, align 4
call void @llvm.dbg.declare(metadata !{i32* %i.addr}, metadata !26, metadata !{i32 786690}), !dbg !27
call void @llvm.dbg.declare(metadata !{i32* %j}, metadata !28, metadata !{i32 786690}), !dbg !30
store i32 0, i32* %j, align 4, !dbg !31
%tmp = load i32* %i.addr, align 4, !dbg !32
%cmp = icmp eq i32 %tmp, 42, !dbg !32
br i1 %cmp, label %if.then, label %if.end, !dbg !32
if.then: ; preds = %entry
%tmp1 = load i32* %i.addr, align 4, !dbg !33
%add = add nsw i32 %tmp1, 1, !dbg !33
store i32 %add, i32* %j, align 4, !dbg !33
br label %if.end, !dbg !35
if.end: ; preds = %if.then, %entry
store i1 false, i1* %nrvo, !dbg !36
call void @llvm.dbg.declare(metadata !{%class.A* %agg.result}, metadata !37, metadata !{i32 786690}), !dbg !39
%tmp2 = load i32* %j, align 4, !dbg !40
%x = getelementptr inbounds %class.A* %agg.result, i32 0, i32 0, !dbg !40
store i32 %tmp2, i32* %x, align 4, !dbg !40
store i1 true, i1* %nrvo, !dbg !41
store i32 1, i32* %cleanup.dest.slot
%nrvo.val = load i1* %nrvo, !dbg !42
br i1 %nrvo.val, label %nrvo.skipdtor, label %nrvo.unused, !dbg !42
nrvo.unused: ; preds = %if.end
call void @_ZN1AD1Ev(%class.A* %agg.result), !dbg !42
br label %nrvo.skipdtor, !dbg !42
nrvo.skipdtor: ; preds = %nrvo.unused, %if.end
ret void, !dbg !42
}
declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
define linkonce_odr void @_ZN1AD1Ev(%class.A* %this) unnamed_addr ssp align 2 {
entry:
%this.addr = alloca %class.A*, align 8
store %class.A* %this, %class.A** %this.addr, align 8
call void @llvm.dbg.declare(metadata !{%class.A** %this.addr}, metadata !43, metadata !{i32 786690}), !dbg !44
%this1 = load %class.A** %this.addr
call void @_ZN1AD2Ev(%class.A* %this1)
ret void, !dbg !45
}
define linkonce_odr void @_ZN1AD2Ev(%class.A* %this) unnamed_addr nounwind ssp align 2 {
entry:
%this.addr = alloca %class.A*, align 8
store %class.A* %this, %class.A** %this.addr, align 8
call void @llvm.dbg.declare(metadata !{%class.A** %this.addr}, metadata !46, metadata !{i32 786690}), !dbg !47
%this1 = load %class.A** %this.addr
%x = getelementptr inbounds %class.A* %this1, i32 0, i32 0, !dbg !48
store i32 1, i32* %x, align 4, !dbg !48
ret void, !dbg !48
}
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!52}
!0 = metadata !{i32 786478, metadata !51, metadata !1, metadata !"~A", metadata !"~A", metadata !"", i32 2, metadata !11, i1 false, i1 false, i32 0, i32 0, null, i32 256, i1 false, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
!1 = metadata !{i32 589826, metadata !51, metadata !2, metadata !"A", i32 2, i64 128, i64 32, i32 0, i32 0, null, metadata !4, i32 0, null, null, null} ; [ DW_TAG_class_type ] [A] [line 2, size 128, align 32, offset 0] [def] [from ]
!2 = metadata !{i32 786449, metadata !51, i32 4, metadata !"clang version 3.0 (trunk 130127)", i1 false, metadata !"", i32 0, metadata !24, metadata !24, metadata !50, null, null, null, i32 1} ; [ DW_TAG_compile_unit ]
!3 = metadata !{i32 786473, metadata !51} ; [ DW_TAG_file_type ]
!4 = metadata !{metadata !5, metadata !7, metadata !8, metadata !9, metadata !0, metadata !10, metadata !14}
!5 = metadata !{i32 786445, metadata !51, metadata !3, metadata !"x", i32 2, i64 32, i64 32, i64 0, i32 0, metadata !6} ; [ DW_TAG_member ]
!6 = metadata !{i32 786468, null, metadata !2, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]
!7 = metadata !{i32 786445, metadata !51, metadata !3, metadata !"y", i32 2, i64 32, i64 32, i64 32, i32 0, metadata !6} ; [ DW_TAG_member ]
!8 = metadata !{i32 786445, metadata !51, metadata !3, metadata !"z", i32 2, i64 32, i64 32, i64 64, i32 0, metadata !6} ; [ DW_TAG_member ]
!9 = metadata !{i32 786445, metadata !51, metadata !3, metadata !"o", i32 2, i64 32, i64 32, i64 96, i32 0, metadata !6} ; [ DW_TAG_member ]
!10 = metadata !{i32 786478, metadata !51, metadata !1, metadata !"A", metadata !"A", metadata !"", i32 2, metadata !11, i1 false, i1 false, i32 0, i32 0, null, i32 320, i1 false, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
!11 = metadata !{i32 786453, metadata !51, metadata !3, metadata !"", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !12, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!12 = metadata !{null, metadata !13}
!13 = metadata !{i32 786447, metadata !2, null, i32 0, i32 0, i64 64, i64 64, i64 0, i32 64, metadata !1} ; [ DW_TAG_pointer_type ]
!14 = metadata !{i32 786478, metadata !51, metadata !1, metadata !"A", metadata !"A", metadata !"", i32 2, metadata !15, i1 false, i1 false, i32 0, i32 0, null, i32 320, i1 false, null, null, null, null, i32 0} ; [ DW_TAG_subprogram ]
!15 = metadata !{i32 786453, metadata !51, metadata !3, metadata !"", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !16, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!16 = metadata !{null, metadata !13, metadata !17}
!17 = metadata !{i32 589840, null, metadata !2, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !18} ; [ DW_TAG_reference_type ]
!18 = metadata !{i32 786470, metadata !2, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !1} ; [ DW_TAG_const_type ]
!19 = metadata !{i32 786478, metadata !51, metadata !3, metadata !"foo", metadata !"foo", metadata !"_Z3fooi", i32 4, metadata !20, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (%class.A*, i32)* @_Z3fooi, null, null, null, i32 0} ; [ DW_TAG_subprogram ] [line 4] [def] [scope 0] [foo]
!20 = metadata !{i32 786453, metadata !51, metadata !3, metadata !"", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !21, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!21 = metadata !{metadata !1}
!22 = metadata !{i32 786478, metadata !51, metadata !3, metadata !"~A", metadata !"~A", metadata !"_ZN1AD1Ev", i32 2, metadata !23, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (%class.A*)* @_ZN1AD1Ev, null, null, null, i32 0} ; [ DW_TAG_subprogram ] [line 2] [def] [scope 0] [~A]
!23 = metadata !{i32 786453, metadata !51, metadata !3, metadata !"", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !24, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!24 = metadata !{null}
!25 = metadata !{i32 786478, metadata !51, metadata !3, metadata !"~A", metadata !"~A", metadata !"_ZN1AD2Ev", i32 2, metadata !23, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (%class.A*)* @_ZN1AD2Ev, null, null, null, i32 0} ; [ DW_TAG_subprogram ] [line 2] [def] [scope 0] [~A]
!26 = metadata !{i32 786689, metadata !19, metadata !"i", metadata !3, i32 16777220, metadata !6, i32 0, null} ; [ DW_TAG_arg_variable ]
!27 = metadata !{i32 4, i32 11, metadata !19, null}
!28 = metadata !{i32 786688, metadata !29, metadata !"j", metadata !3, i32 5, metadata !6, i32 0, null} ; [ DW_TAG_auto_variable ]
!29 = metadata !{i32 786443, metadata !51, metadata !19, i32 4, i32 14, i32 0} ; [ DW_TAG_lexical_block ]
!30 = metadata !{i32 5, i32 7, metadata !29, null}
!31 = metadata !{i32 5, i32 12, metadata !29, null}
!32 = metadata !{i32 6, i32 3, metadata !29, null}
!33 = metadata !{i32 7, i32 5, metadata !34, null}
!34 = metadata !{i32 786443, metadata !51, metadata !29, i32 6, i32 16, i32 1} ; [ DW_TAG_lexical_block ]
!35 = metadata !{i32 8, i32 3, metadata !34, null}
!36 = metadata !{i32 9, i32 9, metadata !29, null}
!37 = metadata !{i32 786688, metadata !29, metadata !"my_a", metadata !3, i32 9, metadata !38, i32 0, null} ; [ DW_TAG_auto_variable ]
!38 = metadata !{i32 589840, metadata !2, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !1} ; [ DW_TAG_reference_type ]
!39 = metadata !{i32 9, i32 5, metadata !29, null}
!40 = metadata !{i32 10, i32 3, metadata !29, null}
!41 = metadata !{i32 11, i32 3, metadata !29, null}
!42 = metadata !{i32 12, i32 1, metadata !29, null}
!43 = metadata !{i32 786689, metadata !22, metadata !"this", metadata !3, i32 16777218, metadata !13, i32 64, null} ; [ DW_TAG_arg_variable ]
!44 = metadata !{i32 2, i32 47, metadata !22, null}
!45 = metadata !{i32 2, i32 61, metadata !22, null}
!46 = metadata !{i32 786689, metadata !25, metadata !"this", metadata !3, i32 16777218, metadata !13, i32 64, null} ; [ DW_TAG_arg_variable ]
!47 = metadata !{i32 2, i32 47, metadata !25, null}
!48 = metadata !{i32 2, i32 54, metadata !49, null}
!49 = metadata !{i32 786443, metadata !51, metadata !25, i32 2, i32 52, i32 2} ; [ DW_TAG_lexical_block ]
!50 = metadata !{metadata !19, metadata !22, metadata !25}
!51 = metadata !{metadata !"a.cc", metadata !"/private/tmp"}
!52 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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