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llvm-6502/test/DebugInfo/sugared-constants.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: %llc_dwarf -O0 -filetype=obj %s -o - | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; Use correct signedness when emitting constants of derived (sugared) types.
; Test compiled to IR from clang with -O1 and the following source:
; void func(int);
; void func(unsigned);
; void func(char16_t);
; int main() {
; const int i = 42;
; func(i);
; const unsigned j = 117;
; func(j);
; char16_t c = 7;
; func(c);
; }
; CHECK: DW_AT_const_value [DW_FORM_sdata] (42)
; CHECK: DW_AT_const_value [DW_FORM_udata] (117)
; CHECK: DW_AT_const_value [DW_FORM_udata] (7)
; Function Attrs: uwtable
define i32 @main() #0 {
entry:
tail call void @llvm.dbg.value(metadata !20, i64 0, metadata !10, metadata !{i32 786690}), !dbg !21
tail call void @_Z4funci(i32 42), !dbg !22
tail call void @llvm.dbg.value(metadata !23, i64 0, metadata !12, metadata !{i32 786690}), !dbg !24
tail call void @_Z4funcj(i32 117), !dbg !25
tail call void @llvm.dbg.value(metadata !26, i64 0, metadata !15, metadata !{i32 786690}), !dbg !27
tail call void @_Z4funcDs(i16 zeroext 7), !dbg !28
ret i32 0, !dbg !29
}
declare void @_Z4funci(i32) #1
declare void @_Z4funcj(i32) #1
declare void @_Z4funcDs(i16 zeroext) #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
attributes #0 = { uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "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 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!17, !18}
!llvm.ident = !{!19}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/const.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"const.cpp", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"main", metadata !"main", metadata !"", i32 4, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 true, i32 ()* @main, null, null, metadata !9, i32 4} ; [ DW_TAG_subprogram ] [line 4] [def] [main]
!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/const.cpp]
!6 = metadata !{i32 786453, i32 0, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !7, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!7 = metadata !{metadata !8}
!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 !12, metadata !15}
!10 = metadata !{i32 786688, metadata !4, metadata !"i", metadata !5, i32 5, metadata !11, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [i] [line 5]
!11 = metadata !{i32 786470, null, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, metadata !8} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from int]
!12 = metadata !{i32 786688, metadata !4, metadata !"j", metadata !5, i32 7, metadata !13, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [j] [line 7]
!13 = metadata !{i32 786470, null, null, metadata !"", i32 0, i64 0, i64 0, i64 0, i32 0, metadata !14} ; [ DW_TAG_const_type ] [line 0, size 0, align 0, offset 0] [from unsigned int]
!14 = metadata !{i32 786468, null, null, metadata !"unsigned int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 7} ; [ DW_TAG_base_type ] [unsigned int] [line 0, size 32, align 32, offset 0, enc DW_ATE_unsigned]
!15 = metadata !{i32 786688, metadata !4, metadata !"c", metadata !5, i32 9, metadata !16, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [c] [line 9]
!16 = metadata !{i32 786468, null, null, metadata !"char16_t", i32 0, i64 16, i64 16, i64 0, i32 0, i32 16} ; [ DW_TAG_base_type ] [char16_t] [line 0, size 16, align 16, offset 0, enc DW_ATE_UTF]
!17 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!18 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!19 = metadata !{metadata !"clang version 3.5.0 "}
!20 = metadata !{i32 42}
!21 = metadata !{i32 5, i32 0, metadata !4, null}
!22 = metadata !{i32 6, i32 0, metadata !4, null}
!23 = metadata !{i32 117}
!24 = metadata !{i32 7, i32 0, metadata !4, null}
!25 = metadata !{i32 8, i32 0, metadata !4, null} ; [ DW_TAG_imported_declaration ]
!26 = metadata !{i16 7}
!27 = metadata !{i32 9, i32 0, metadata !4, null}
!28 = metadata !{i32 10, i32 0, metadata !4, null}
!29 = metadata !{i32 11, i32 0, metadata !4, null}
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