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llvm-6502/test/CodeGen/X86/stack-protector-dbginfo.ll
Adrian Prantl 076fd5dfc1 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!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218778 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-01 17:55:39 +00:00

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; RUN: llc -mtriple=x86_64-apple-darwin < %s -o -
; PR16954
;
; Make sure that when we splice off the end of a machine basic block, we include
; DBG_VALUE MI in the terminator sequence.
@a = external global { i64, [56 x i8] }, align 32
; Function Attrs: nounwind sspreq
define i32 @_Z18read_response_sizev() #0 {
entry:
tail call void @llvm.dbg.value(metadata !22, i64 0, metadata !23, metadata !{}), !dbg !39
%0 = load i64* getelementptr inbounds ({ i64, [56 x i8] }* @a, i32 0, i32 0), align 8, !dbg !40
tail call void @llvm.dbg.value(metadata !63, i64 0, metadata !64, metadata !{}), !dbg !71
%1 = trunc i64 %0 to i32
ret i32 %1
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
attributes #0 = { sspreq }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!21, !72}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.4 ", i1 true, metadata !"", i32 0, metadata !2, metadata !5, metadata !8, metadata !20, metadata !5, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/Users/matt/ryan_bug/<unknown>] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"<unknown>", metadata !"/Users/matt/ryan_bug"}
!2 = metadata !{metadata !3}
!3 = metadata !{i32 786436, metadata !1, metadata !4, metadata !"", i32 20, i64 32, i64 32, i32 0, i32 0, null, metadata !6, i32 0, null, null, null} ; [ DW_TAG_enumeration_type ] [line 20, size 32, align 32, offset 0] [def] [from ]
!4 = metadata !{i32 786451, metadata !1, null, metadata !"C", i32 19, i64 8, i64 8, i32 0, i32 0, null, metadata !5, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [C] [line 19, size 8, align 8, offset 0] [def] [from ]
!5 = metadata !{}
!6 = metadata !{metadata !7}
!7 = metadata !{i32 786472, metadata !"max_frame_size", i64 0} ; [ DW_TAG_enumerator ] [max_frame_size :: 0]
!8 = metadata !{metadata !9, metadata !24, metadata !41, metadata !65}
!9 = metadata !{i32 786478, metadata !1, metadata !10, metadata !"read_response_size", metadata !"read_response_size", metadata !"_Z18read_response_sizev", i32 27, metadata !11, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 ()* @_Z18read_response_sizev, null, null, metadata !14, i32 27} ; [ DW_TAG_subprogram ] [line 27] [def] [read_response_size]
!10 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/Users/matt/ryan_bug/<unknown>]
!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 !{metadata !15, metadata !19}
!15 = metadata !{i32 786688, metadata !9, metadata !"b", metadata !10, i32 28, metadata !16, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [b] [line 28]
!16 = metadata !{i32 786451, metadata !1, null, metadata !"B", i32 16, i64 32, i64 32, i32 0, i32 0, null, metadata !17, i32 0, null, null} ; [ DW_TAG_structure_type ] [B] [line 16, size 32, align 32, offset 0] [def] [from ]
!17 = metadata !{metadata !18}
!18 = metadata !{i32 786445, metadata !1, metadata !16, metadata !"end_of_file", i32 17, i64 32, i64 32, i64 0, i32 0, metadata !13} ; [ DW_TAG_member ] [end_of_file] [line 17, size 32, align 32, offset 0] [from int]
!19 = metadata !{i32 786688, metadata !9, metadata !"c", metadata !10, i32 29, metadata !13, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [c] [line 29]
!20 = metadata !{}
!21 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
!22 = metadata !{i64* getelementptr inbounds ({ i64, [56 x i8] }* @a, i32 0, i32 0)}
!23 = metadata !{i32 786689, metadata !24, metadata !"p2", metadata !10, i32 33554444, metadata !32, i32 0, metadata !38} ; [ DW_TAG_arg_variable ] [p2] [line 12]
!24 = metadata !{i32 786478, metadata !1, metadata !25, metadata !"min<unsigned long long>", metadata !"min<unsigned long long>", metadata !"_ZN3__13minIyEERKT_S3_RS1_", i32 12, metadata !27, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, null, metadata !33, null, metadata !35, i32 12} ; [ DW_TAG_subprogram ] [line 12] [def] [min<unsigned long long>]
!25 = metadata !{i32 786489, metadata !26, null, metadata !"__1", i32 1} ; [ DW_TAG_namespace ] [__1] [line 1]
!26 = metadata !{metadata !"main.cpp", metadata !"/Users/matt/ryan_bug"}
!27 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !28, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!28 = metadata !{metadata !29, metadata !29, metadata !32}
!29 = metadata !{i32 786448, null, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !30} ; [ DW_TAG_reference_type ] [line 0, size 0, align 0, offset 0] [from ]
!30 = metadata !{i32 786470, null, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, metadata !31} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from long long unsigned int]
!31 = metadata !{i32 786468, null, null, metadata !"long long unsigned int", i32 0, i64 64, i64 64, i64 0, i32 0, i32 7} ; [ DW_TAG_base_type ] [long long unsigned int] [line 0, size 64, align 64, offset 0, enc DW_ATE_unsigned]
!32 = metadata !{i32 786448, null, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !31} ; [ DW_TAG_reference_type ] [line 0, size 0, align 0, offset 0] [from long long unsigned int]
!33 = metadata !{metadata !34}
!34 = metadata !{i32 786479, null, metadata !"_Tp", metadata !31, null, i32 0, i32 0} ; [ DW_TAG_template_type_parameter ]
!35 = metadata !{metadata !36, metadata !37}
!36 = metadata !{i32 786689, metadata !24, metadata !"p1", metadata !10, i32 16777228, metadata !29, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p1] [line 12]
!37 = metadata !{i32 786689, metadata !24, metadata !"p2", metadata !10, i32 33554444, metadata !32, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p2] [line 12]
!38 = metadata !{i32 33, i32 0, metadata !9, null}
!39 = metadata !{i32 12, i32 0, metadata !24, metadata !38}
!40 = metadata !{i32 9, i32 0, metadata !41, metadata !59}
!41 = metadata !{i32 786478, metadata !1, metadata !25, metadata !"min<unsigned long long, __1::A>", metadata !"min<unsigned long long, __1::A>", metadata !"_ZN3__13minIyNS_1AEEERKT_S4_RS2_T0_", i32 7, metadata !42, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, null, metadata !53, null, metadata !55, i32 8} ; [ DW_TAG_subprogram ] [line 7] [def] [scope 8] [min<unsigned long long, __1::A>]
!42 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !43, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!43 = metadata !{metadata !29, metadata !29, metadata !32, metadata !44}
!44 = metadata !{i32 786451, metadata !1, metadata !25, metadata !"A", i32 0, i64 8, i64 8, i32 0, i32 0, null, metadata !45, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [A] [line 0, size 8, align 8, offset 0] [def] [from ]
!45 = metadata !{metadata !46}
!46 = metadata !{i32 786478, metadata !1, metadata !44, metadata !"operator()", metadata !"operator()", metadata !"_ZN3__11AclERKiS2_", i32 1, metadata !47, i1 false, i1 false, i32 0, i32 0, null, i32 256, i1 true, null, null, i32 0, metadata !52, i32 1} ; [ DW_TAG_subprogram ] [line 1] [operator()]
!47 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !48, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!48 = metadata !{metadata !13, metadata !49, metadata !50, metadata !50}
!49 = metadata !{i32 786447, i32 0, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 1088, metadata !44} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [artificial] [from A]
!50 = metadata !{i32 786448, null, null, null, i32 0, i64 0, i64 0, i64 0, i32 0, metadata !51} ; [ DW_TAG_reference_type ] [line 0, size 0, align 0, offset 0] [from ]
!51 = metadata !{i32 786470, null, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, metadata !13} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from int]
!52 = metadata !{i32 786468}
!53 = metadata !{metadata !34, metadata !54}
!54 = metadata !{i32 786479, null, metadata !"_Compare", metadata !44, null, i32 0, i32 0} ; [ DW_TAG_template_type_parameter ]
!55 = metadata !{metadata !56, metadata !57, metadata !58}
!56 = metadata !{i32 786689, metadata !41, metadata !"p1", metadata !10, i32 16777223, metadata !29, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p1] [line 7]
!57 = metadata !{i32 786689, metadata !41, metadata !"p2", metadata !10, i32 33554439, metadata !32, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p2] [line 7]
!58 = metadata !{i32 786689, metadata !41, metadata !"p3", metadata !10, i32 50331656, metadata !44, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p3] [line 8]
!59 = metadata !{i32 13, i32 0, metadata !24, metadata !38}
!63 = metadata !{i32 undef}
!64 = metadata !{i32 786689, metadata !65, metadata !"p1", metadata !10, i32 33554433, metadata !50, i32 0, metadata !40} ; [ DW_TAG_arg_variable ] [p1] [line 1]
!65 = metadata !{i32 786478, metadata !1, metadata !25, metadata !"operator()", metadata !"operator()", metadata !"_ZN3__11AclERKiS2_", i32 1, metadata !47, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, null, null, metadata !46, metadata !66, i32 2} ; [ DW_TAG_subprogram ] [line 1] [def] [scope 2] [operator()]
!66 = metadata !{metadata !67, metadata !69, metadata !70}
!67 = metadata !{i32 786689, metadata !65, metadata !"this", null, i32 16777216, metadata !68, i32 1088, i32 0} ; [ DW_TAG_arg_variable ] [this] [line 0]
!68 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !44} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from A]
!69 = metadata !{i32 786689, metadata !65, metadata !"p1", metadata !10, i32 33554433, metadata !50, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p1] [line 1]
!70 = metadata !{i32 786689, metadata !65, metadata !"", metadata !10, i32 50331650, metadata !50, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [line 2]
!71 = metadata !{i32 1, i32 0, metadata !65, metadata !40}
!72 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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