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02474a32eb
llvm-6502/test/Linker/type-unique-simple2-a.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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; REQUIRES: object-emission
;
; RUN: llvm-link %s %p/type-unique-simple2-b.ll -S -o - | %llc_dwarf -filetype=obj -O0 | llvm-dwarfdump -debug-dump=info - | FileCheck %s
;
; Tests for a merge error where attributes are inserted twice into the same DIE.
;
; $ cat ab.h
; typedef int foo_t;
; class A {
; public:
; virtual void setFoo();
; virtual const foo_t getFoo();
; };
;
; $ cat a.cpp
; #include "ab.h"
; foo_t bar() {
; return A().getFoo();
; }
;
; CHECK: _ZN1A6setFooEv
; CHECK: DW_AT_accessibility [DW_FORM_data1] (DW_ACCESS_public)
; CHECK-NOT: DW_AT_accessibility
; CHECK: DW_TAG
; ModuleID = 'a.cpp'
%class.A = type { i32 (...)** }
@_ZTV1A = external unnamed_addr constant [4 x i8*]
; Function Attrs: nounwind
define i32 @_Z3barv() #0 {
entry:
%tmp = alloca %class.A, align 8
%0 = bitcast %class.A* %tmp to i8*, !dbg !38
call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 8, i32 8, i1 false), !dbg !38
call void @_ZN1AC1Ev(%class.A* %tmp) #1, !dbg !38
%call = call i32 @_ZN1A6getFooEv(%class.A* %tmp), !dbg !38
ret i32 %call, !dbg !38
}
; Function Attrs: nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #1
; Function Attrs: inlinehint nounwind
define linkonce_odr void @_ZN1AC1Ev(%class.A* %this) unnamed_addr #2 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 !39, metadata !{i32 786690}), !dbg !41
%this1 = load %class.A** %this.addr
call void @_ZN1AC2Ev(%class.A* %this1) #1, !dbg !42
ret void, !dbg !42
}
declare i32 @_ZN1A6getFooEv(%class.A*)
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #4
; Function Attrs: inlinehint nounwind
define linkonce_odr void @_ZN1AC2Ev(%class.A* %this) unnamed_addr #2 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 !44, metadata !{i32 786690}), !dbg !45
%this1 = load %class.A** %this.addr
%0 = bitcast %class.A* %this1 to i8***, !dbg !46
store i8** getelementptr inbounds ([4 x i8*]* @_ZTV1A, i64 0, i64 2), i8*** %0, !dbg !46
ret void, !dbg !46
}
attributes #0 = { nounwind }
attributes #1 = { nounwind }
attributes #2 = { inlinehint nounwind }
attributes #4 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!35, !36}
!llvm.ident = !{!37}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5 ", i1 false, metadata !"", i32 0, metadata !2, metadata !3, metadata !26, metadata !2, metadata !2, metadata !""} ; [ DW_TAG_compile_unit ] [/<unknown>] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"<unknown>", metadata !""}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786434, metadata !5, null, metadata !"A", i32 2, i64 64, i64 64, i32 0, i32 0, null, metadata !6, i32 0, metadata !"_ZTS1A", null, metadata !"_ZTS1A"} ; [ DW_TAG_class_type ] [A] [line 2, size 64, align 64, offset 0] [def] [from ]
!5 = metadata !{metadata !"./ab.h", metadata !""}
!6 = metadata !{metadata !7, metadata !14, metadata !19}
!7 = metadata !{i32 786445, metadata !5, metadata !8, metadata !"_vptr$A", i32 0, i64 64, i64 0, i64 0, i32 64, metadata !9} ; [ DW_TAG_member ] [_vptr$A] [line 0, size 64, align 0, offset 0] [artificial] [from ]
!8 = metadata !{i32 786473, metadata !5} ; [ DW_TAG_file_type ] [/./ab.h]
!9 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 0, i64 0, i32 0, metadata !10} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 0, offset 0] [from __vtbl_ptr_type]
!10 = metadata !{i32 786447, null, null, metadata !"__vtbl_ptr_type", i32 0, i64 64, i64 0, i64 0, i32 0, metadata !11} ; [ DW_TAG_pointer_type ] [__vtbl_ptr_type] [line 0, size 64, align 0, offset 0] [from ]
!11 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 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 !{metadata !13}
!13 = 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]
!14 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1A", metadata !"setFoo", metadata !"setFoo", metadata !"_ZN1A6setFooEv", i32 4, metadata !15, i1 false, i1 false, i32 1, i32 0, metadata !"_ZTS1A", i32 259, i1 false, null, null, i32 0, metadata !18, i32 4} ; [ DW_TAG_subprogram ] [line 4] [setFoo]
!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 !{null, metadata !17}
!17 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 1088, metadata !"_ZTS1A"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from _ZTS1A]
!18 = metadata !{i32 786468}
!19 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1A", metadata !"getFoo", metadata !"getFoo", metadata !"_ZN1A6getFooEv", i32 5, metadata !20, i1 false, i1 false, i32 1, i32 1, metadata !"_ZTS1A", i32 259, i1 false, null, null, i32 0, metadata !25, i32 5} ; [ DW_TAG_subprogram ] [line 5] [getFoo]
!20 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 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 !22, metadata !17}
!22 = metadata !{i32 786470, null, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, metadata !23} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from foo_t]
!23 = metadata !{i32 786454, metadata !24, null, metadata !"foo_t", i32 1, i64 0, i64 0, i64 0, i32 0, metadata !13} ; [ DW_TAG_typedef ] [foo_t] [line 1, size 0, align 0, offset 0] [from int]
!24 = metadata !{metadata !"a.cpp", metadata !""}
!25 = metadata !{i32 786468}
!26 = metadata !{metadata !27, metadata !31, metadata !34}
!27 = metadata !{i32 786478, metadata !24, metadata !28, metadata !"bar", metadata !"bar", metadata !"_Z3barv", i32 2, metadata !29, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 ()* @_Z3barv, null, null, metadata !2, i32 2} ; [ DW_TAG_subprogram ] [line 2] [def] [bar]
!28 = metadata !{i32 786473, metadata !24} ; [ DW_TAG_file_type ] [/a.cpp]
!29 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !30, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!30 = metadata !{metadata !23}
!31 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1A", metadata !"A", metadata !"A", metadata !"_ZN1AC1Ev", i32 2, metadata !15, i1 false, i1 true, i32 0, i32 0, null, i32 320, i1 false, void (%class.A*)* @_ZN1AC1Ev, null, metadata !32, metadata !2, i32 2} ; [ DW_TAG_subprogram ] [line 2] [def] [A]
!32 = metadata !{i32 786478, null, metadata !"_ZTS1A", metadata !"A", metadata !"A", metadata !"", i32 0, metadata !15, i1 false, i1 false, i32 0, i32 0, null, i32 320, i1 false, null, null, i32 0, metadata !33, i32 0} ; [ DW_TAG_subprogram ] [line 0] [A]
!33 = metadata !{i32 786468}
!34 = metadata !{i32 786478, metadata !5, metadata !"_ZTS1A", metadata !"A", metadata !"A", metadata !"_ZN1AC2Ev", i32 2, metadata !15, i1 false, i1 true, i32 0, i32 0, null, i32 320, i1 false, void (%class.A*)* @_ZN1AC2Ev, null, metadata !32, metadata !2, i32 2} ; [ DW_TAG_subprogram ] [line 2] [def] [A]
!35 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
!36 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!37 = metadata !{metadata !"clang version 3.5 "}
!38 = metadata !{i32 3, i32 0, metadata !27, null}
!39 = metadata !{i32 786689, metadata !31, metadata !"this", null, i32 16777216, metadata !40, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0]
!40 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !"_ZTS1A"} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from _ZTS1A]
!41 = metadata !{i32 0, i32 0, metadata !31, null}
!42 = metadata !{i32 2, i32 0, metadata !43, null}
!43 = metadata !{i32 786443, metadata !5, metadata !31, i32 0} ; [ DW_TAG_lexical_block ] [/./ab.h]
!44 = metadata !{i32 786689, metadata !34, metadata !"this", null, i32 16777216, metadata !40, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0]
!45 = metadata !{i32 0, i32 0, metadata !34, null}
!46 = metadata !{i32 2, i32 0, metadata !34, null}
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