xref: /llvm-project/llvm/test/DebugInfo/Generic/assignment-tracking/sroa/alloca-single-slice.ll (revision 094572701dce4aaf36f4521d6cf750420d39f206) 
1; RUN: opt -passes=sroa,verify -S %s -o - \
2; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
3; RUN: opt --try-experimental-debuginfo-iterators -passes=sroa,verify -S %s -o - \
4; RUN: | FileCheck %s --implicit-check-not="call void @llvm.dbg"
5
6; Check that single sliced allocas retain their assignment tracking debug info.
7
8;; $ cat test.c
9;; struct a {
10;;   char b[8];
11;; };
12;; int c;
13;; void d() {
14;;   struct a a;
15;;   memcpy(a.b, 0, c);
16;; }
17;; $ clang test.c -Xclang -disable-llvm-passes -O2 -g -c -S -emit-llvm -o - \
18;;   | opt -passes=declare-to-assign -S -o -
19
20; CHECK: entry:
21; CHECK-NEXT: %a.sroa.0 = alloca i64, align 8, !DIAssignID ![[ID_1:[0-9]+]]
22; CHECK-NEXT: #dbg_assign(i1 undef, ![[VAR:[0-9]+]], !DIExpression(), ![[ID_1]], ptr %a.sroa.0, !DIExpression(),
23
24target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
25
26%struct.a = type { [8 x i8] }
27
28@c = dso_local global i32 0, align 4, !dbg !0
29
30define dso_local void @d() !dbg !11 {
31entry:
32  %a = alloca %struct.a, align 1, !DIAssignID !23
33  call void @llvm.dbg.assign(metadata i1 undef, metadata !15, metadata !DIExpression(), metadata !23, metadata ptr %a, metadata !DIExpression()), !dbg !24
34  %0 = bitcast ptr %a to ptr, !dbg !25
35  call void @llvm.lifetime.start.p0(i64 8, ptr %0), !dbg !25
36  %b = getelementptr inbounds %struct.a, ptr %a, i32 0, i32 0, !dbg !26
37  %arraydecay = getelementptr inbounds [8 x i8], ptr %b, i64 0, i64 0, !dbg !27
38  %1 = load i32, ptr @c, align 4, !dbg !28
39  %conv = sext i32 %1 to i64, !dbg !28
40  call void @llvm.memcpy.p0.p0.i64(ptr align 1 %arraydecay, ptr align 1 null, i64 %conv, i1 false), !dbg !27
41  %2 = bitcast ptr %a to ptr, !dbg !33
42  call void @llvm.lifetime.end.p0(i64 8, ptr %2), !dbg !33
43  ret void, !dbg !33
44}
45
46declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
47declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)
48declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)
49declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata)
50
51!llvm.dbg.cu = !{!2}
52!llvm.module.flags = !{!7, !8, !9, !1000}
53!llvm.ident = !{!10}
54
55!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
56!1 = distinct !DIGlobalVariable(name: "c", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true)
57!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
58!3 = !DIFile(filename: "test.c", directory: "/")
59!4 = !{}
60!5 = !{!0}
61!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
62!7 = !{i32 7, !"Dwarf Version", i32 4}
63!8 = !{i32 2, !"Debug Info Version", i32 3}
64!9 = !{i32 1, !"wchar_size", i32 4}
65!10 = !{!"clang version 12.0.0"}
66!11 = distinct !DISubprogram(name: "d", scope: !3, file: !3, line: 5, type: !12, scopeLine: 5, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !14)
67!12 = !DISubroutineType(types: !13)
68!13 = !{null}
69!14 = !{!15}
70!15 = !DILocalVariable(name: "a", scope: !11, file: !3, line: 6, type: !16)
71!16 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "a", file: !3, line: 1, size: 64, elements: !17)
72!17 = !{!18}
73!18 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !16, file: !3, line: 2, baseType: !19, size: 64)
74!19 = !DICompositeType(tag: DW_TAG_array_type, baseType: !20, size: 64, elements: !21)
75!20 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
76!21 = !{!22}
77!22 = !DISubrange(count: 8)
78!23 = distinct !DIAssignID()
79!24 = !DILocation(line: 0, scope: !11)
80!25 = !DILocation(line: 6, column: 3, scope: !11)
81!26 = !DILocation(line: 7, column: 12, scope: !11)
82!27 = !DILocation(line: 7, column: 3, scope: !11)
83!28 = !DILocation(line: 7, column: 18, scope: !11)
84!33 = !DILocation(line: 8, column: 1, scope: !11)
85!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
86