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llvm-6502/test/DebugInfo/X86/array2.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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; ModuleID = 'array.c'
;
; From (clang -g -c -O0):
;
; void f(int* p) {
; p[0] = 42;
; }
;
; int main(int argc, char** argv) {
; int array[4] = { 0, 1, 2, 3 };
; f(array);
; return array[0];
; }
;
; RUN: opt %s -O2 -S -o - | FileCheck %s
; Test that we do not lower dbg.declares for arrays.
;
; CHECK: define i32 @main
; CHECK: call void @llvm.dbg.value
; CHECK: call void @llvm.dbg.value
; CHECK: call void @llvm.dbg.declare
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9.0"
@main.array = private unnamed_addr constant [4 x i32] [i32 0, i32 1, i32 2, i32 3], align 16
; Function Attrs: nounwind ssp uwtable
define void @f(i32* %p) #0 {
entry:
%p.addr = alloca i32*, align 8
store i32* %p, i32** %p.addr, align 8
call void @llvm.dbg.declare(metadata !{i32** %p.addr}, metadata !19, metadata !{i32 786690}), !dbg !20
%0 = load i32** %p.addr, align 8, !dbg !21
%arrayidx = getelementptr inbounds i32* %0, i64 0, !dbg !21
store i32 42, i32* %arrayidx, align 4, !dbg !21
ret void, !dbg !22
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind ssp uwtable
define i32 @main(i32 %argc, i8** %argv) #0 {
entry:
%retval = alloca i32, align 4
%argc.addr = alloca i32, align 4
%argv.addr = alloca i8**, align 8
%array = alloca [4 x i32], align 16
store i32 0, i32* %retval
store i32 %argc, i32* %argc.addr, align 4
call void @llvm.dbg.declare(metadata !{i32* %argc.addr}, metadata !23, metadata !{i32 786690}), !dbg !24
store i8** %argv, i8*** %argv.addr, align 8
call void @llvm.dbg.declare(metadata !{i8*** %argv.addr}, metadata !25, metadata !{i32 786690}), !dbg !24
call void @llvm.dbg.declare(metadata !{[4 x i32]* %array}, metadata !26, metadata !{i32 786690}), !dbg !30
%0 = bitcast [4 x i32]* %array to i8*, !dbg !30
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast ([4 x i32]* @main.array to i8*), i64 16, i32 16, i1 false), !dbg !30
%arraydecay = getelementptr inbounds [4 x i32]* %array, i32 0, i32 0, !dbg !31
call void @f(i32* %arraydecay), !dbg !31
%arrayidx = getelementptr inbounds [4 x i32]* %array, i32 0, i64 0, !dbg !32
%1 = load i32* %arrayidx, align 4, !dbg !32
ret i32 %1, !dbg !32
}
; Function Attrs: nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #2
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!16, !17}
!llvm.ident = !{!18}
!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !3, metadata !2, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [array.c] [DW_LANG_C99]
!1 = metadata !{metadata !"array.c", metadata !""}
!2 = metadata !{}
!3 = metadata !{metadata !4, metadata !10}
!4 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"f", metadata !"f", metadata !"", i32 1, metadata !6, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, void (i32*)* @f, null, null, metadata !2, i32 1} ; [ DW_TAG_subprogram ] [line 1] [def] [f]
!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [array.c]
!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 !{null, metadata !8}
!8 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !9} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from int]
!9 = 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]
!10 = metadata !{i32 786478, metadata !1, metadata !5, metadata !"main", metadata !"main", metadata !"", i32 5, metadata !11, i1 false, i1 true, i32 0, i32 0, null, i32 256, i1 false, i32 (i32, i8**)* @main, null, null, metadata !2, i32 5} ; [ DW_TAG_subprogram ] [line 5] [def] [main]
!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 !9, metadata !9, metadata !13}
!13 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !14} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from ]
!14 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !15} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from char]
!15 = metadata !{i32 786468, null, null, metadata !"char", i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ] [char] [line 0, size 8, align 8, offset 0, enc DW_ATE_signed_char]
!16 = metadata !{i32 2, metadata !"Dwarf Version", i32 2}
!17 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!18 = metadata !{metadata !"clang version 3.5.0 "}
!19 = metadata !{i32 786689, metadata !4, metadata !"p", metadata !5, i32 16777217, metadata !8, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [p] [line 1]
!20 = metadata !{i32 1, i32 0, metadata !4, null}
!21 = metadata !{i32 2, i32 0, metadata !4, null}
!22 = metadata !{i32 3, i32 0, metadata !4, null}
!23 = metadata !{i32 786689, metadata !10, metadata !"argc", metadata !5, i32 16777221, metadata !9, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [argc] [line 5]
!24 = metadata !{i32 5, i32 0, metadata !10, null}
!25 = metadata !{i32 786689, metadata !10, metadata !"argv", metadata !5, i32 33554437, metadata !13, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [argv] [line 5]
!26 = metadata !{i32 786688, metadata !10, metadata !"array", metadata !5, i32 6, metadata !27, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [array] [line 6]
!27 = metadata !{i32 786433, null, null, metadata !"", i32 0, i64 128, i64 32, i32 0, i32 0, metadata !9, metadata !28, i32 0, null, null, null} ; [ DW_TAG_array_type ] [line 0, size 128, align 32, offset 0] [from int]
!28 = metadata !{metadata !29}
!29 = metadata !{i32 786465, i64 0, i64 4} ; [ DW_TAG_subrange_type ] [0, 3]
!30 = metadata !{i32 6, i32 0, metadata !10, null}
!31 = metadata !{i32 7, i32 0, metadata !10, null}
!32 = metadata !{i32 8, i32 0, metadata !10, null} ; [ DW_TAG_imported_declaration ]
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