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02474a32eb
llvm-6502/test/Linker/type-unique-simple-b.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

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; RUN: true
; ModuleID = 'bar.cpp'
%struct.Base = type { i32 }
; Function Attrs: nounwind ssp uwtable
define void @_Z1gi(i32 %a) #0 {
entry:
%a.addr = alloca i32, align 4
%t = alloca %struct.Base, align 4
store i32 %a, i32* %a.addr, align 4
call void @llvm.dbg.declare(metadata !{i32* %a.addr}, metadata !18, metadata !{i32 786690}), !dbg !19
call void @llvm.dbg.declare(metadata !{%struct.Base* %t}, metadata !20, metadata !{i32 786690}), !dbg !21
ret void, !dbg !22
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: ssp uwtable
define i32 @main() #2 {
entry:
%retval = alloca i32, align 4
store i32 0, i32* %retval
call void @_Z1fi(i32 0), !dbg !23
call void @_Z1gi(i32 1), !dbg !24
ret i32 0, !dbg !25
}
declare void @_Z1fi(i32) #3
attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = { nounwind readnone }
attributes #2 = { ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!17, !26}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 (http://llvm.org/git/clang.git c23b1db6268c8e7ce64026d57d1510c1aac200a0) (http://llvm.org/git/llvm.git 09b98fe3978eddefc2145adc1056cf21580ce945)", i1 false, metadata !"", i32 0, metadata !2, metadata !3, metadata !9, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/Users/mren/c_testing/type_unique_air/simple/bar.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"bar.cpp", metadata !"/Users/mren/c_testing/type_unique_air/simple"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786451, metadata !5, null, metadata !"Base", i32 1, i64 32, i64 32, i32 0, i32 0, null, metadata !6, i32 0, null, null, metadata !"_ZTS4Base"} ; [ DW_TAG_structure_type ] [Base] [line 1, size 32, align 32, offset 0] [def] [from ]
!5 = metadata !{metadata !"./a.hpp", metadata !"/Users/mren/c_testing/type_unique_air/simple"}
!6 = metadata !{metadata !7}
!7 = metadata !{i32 786445, metadata !5, metadata !"_ZTS4Base", metadata !"a", i32 2, i64 32, i64 32, i64 0, i32 0, metadata !8} ; [ DW_TAG_member ] [a] [line 2, size 32, align 32, offset 0] [from int]
!8 = 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]
!9 = metadata !{metadata !10, metadata !14}
!10 = metadata !{i32 786478, metadata !1, metadata !11, metadata !"g", metadata !"g", metadata !"_Z1gi", i32 4, metadata !12, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32)* @_Z1gi, null, null, metadata !2, i32 4} ; [ DW_TAG_subprogram ] [line 4] [def] [g]
!11 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/Users/mren/c_testing/type_unique_air/simple/bar.cpp]
!12 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !13, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!13 = metadata !{null, metadata !8}
!14 = metadata !{i32 786478, metadata !1, metadata !11, metadata !"main", metadata !"main", metadata !"", i32 7, metadata !15, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @main, null, null, metadata !2, i32 7} ; [ DW_TAG_subprogram ] [line 7] [def] [main]
!15 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 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 !{metadata !8}
!17 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
!18 = metadata !{i32 786689, metadata !10, metadata !"a", metadata !11, i32 16777220, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [a] [line 4]
!19 = metadata !{i32 4, i32 0, metadata !10, null}
!20 = metadata !{i32 786688, metadata !10, metadata !"t", metadata !11, i32 5, metadata !4, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [t] [line 5]
!21 = metadata !{i32 5, i32 0, metadata !10, null}
!22 = metadata !{i32 6, i32 0, metadata !10, null}
!23 = metadata !{i32 8, i32 0, metadata !14, null} ; [ DW_TAG_imported_declaration ]
!24 = metadata !{i32 9, i32 0, metadata !14, null}
!25 = metadata !{i32 10, i32 0, metadata !14, null}
!26 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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