1 ; RUN: opt -instcombine < %s -S | FileCheck %s
3 ; This tests dbg.declare lowering for CallInst users of an alloca. The
4 ; resulting dbg.value expressions should add a deref to the declare's expression.
6 ; Hand-reduced from this example (-g -Og -mllvm -disable-llvm-optzns -gno-column-info):
8 ; static volatile int sink;
9 ; static void escape(int &c) { sink = c; }
10 ; static bool empty ( int p1 ) { return p1 == 0; }
18 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
19 target triple = "x86_64-unknown-linux-gnu"
21 @_ZL4sink = internal global i32 0, align 4, !dbg !0
24 define dso_local i32 @main() !dbg !12 {
26 %retval = alloca i32, align 4
27 %d1 = alloca i32, align 4
28 store i32 0, i32* %retval, align 4
29 %0 = bitcast i32* %d1 to i8*, !dbg !17
30 call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #4, !dbg !17
31 ; CHECK: dbg.value(metadata i32 42, metadata [[METADATA_IDX1:![0-9]+]], metadata !DIExpression())
33 call void @llvm.dbg.declare(metadata i32* %d1, metadata !16, metadata !DIExpression()), !dbg !17
34 store i32 42, i32* %d1, align 4, !dbg !17
35 br label %while.cond, !dbg !22
37 while.cond: ; preds = %while.body, %entry
38 ; CHECK: dbg.value(metadata i32 %1, metadata [[METADATA_IDX1]], metadata !DIExpression())
39 ; CHECK-NEXT: call zeroext i1 @_ZL5emptyi
40 %1 = load i32, i32* %d1, align 4, !dbg !22
41 %call = call zeroext i1 @_ZL5emptyi(i32 %1), !dbg !22
42 %lnot = xor i1 %call, true, !dbg !22
43 br i1 %lnot, label %while.body, label %while.end, !dbg !22
45 while.body: ; preds = %while.cond
46 ; CHECK: dbg.value(metadata i32* %d1, metadata [[METADATA_IDX1]], metadata !DIExpression(DW_OP_deref))
47 ; CHECK-NEXT: call void @_ZL6escapeRi
48 call void @_ZL6escapeRi(i32* dereferenceable(4) %d1), !dbg !23
49 br label %while.cond, !dbg !22, !llvm.loop !24
51 while.end: ; preds = %while.cond
52 %2 = bitcast i32* %d1 to i8*, !dbg !25
53 call void @llvm.lifetime.end.p0i8(i64 4, i8* %2) #4, !dbg !25
57 declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
59 declare void @llvm.dbg.declare(metadata, metadata, metadata)
61 define internal zeroext i1 @_ZL5emptyi(i32 %p1) !dbg !27 {
65 define internal void @_ZL6escapeRi(i32* dereferenceable(4) %c) #3 !dbg !34 {
69 declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
72 !llvm.module.flags = !{!8, !9, !10}
75 ; CHECK: DIGlobalVariableExpression
76 ; CHECK: [[METADATA_IDX1]] = !DILocalVariable(name: "d1"
78 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
79 !1 = distinct !DIGlobalVariable(name: "sink", linkageName: "_ZL4sink", scope: !2, file: !3, line: 2, type: !6, isLocal: true, isDefinition: true)
80 !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
81 !3 = !DIFile(filename: "lower-dbg-declare.cpp", directory: "")
84 !6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
85 !7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
86 !8 = !{i32 2, !"Dwarf Version", i32 4}
87 !9 = !{i32 2, !"Debug Info Version", i32 3}
88 !10 = !{i32 1, !"wchar_size", i32 4}
90 !12 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 5, type: !13, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !15)
91 !13 = !DISubroutineType(types: !14)
94 !16 = !DILocalVariable(name: "d1", scope: !12, file: !3, line: 6, type: !7)
95 !17 = !DILocation(line: 6, scope: !12)
96 !22 = !DILocation(line: 7, scope: !12)
97 !23 = !DILocation(line: 8, scope: !12)
98 !24 = distinct !{!24, !22, !23}
99 !25 = !DILocation(line: 10, scope: !12)
100 !26 = !DILocation(line: 9, scope: !12)
101 !27 = distinct !DISubprogram(name: "empty", linkageName: "_ZL5emptyi", scope: !3, file: !3, line: 4, type: !28, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !31)
102 !28 = !DISubroutineType(types: !29)
104 !30 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
106 !32 = !DILocalVariable(name: "p1", arg: 1, scope: !27, file: !3, line: 4, type: !7)
107 !33 = !DILocation(line: 4, scope: !27)
108 !34 = distinct !DISubprogram(name: "escape", linkageName: "_ZL6escapeRi", scope: !3, file: !3, line: 3, type: !35, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !38)
109 !35 = !DISubroutineType(types: !36)
111 !37 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !7, size: 64)
113 !39 = !DILocalVariable(name: "c", arg: 1, scope: !34, file: !3, line: 3, type: !37)
114 !42 = !DILocation(line: 3, scope: !34)