1; RUN: opt -S -globalopt < %s | FileCheck %s
2; Generated at -O2 -g from:
3; typedef struct {} a;
4; static struct {
5;     long b;
6;     a c;
7; } d;
8; e() {
9;     long f = d.b + 1;
10;     d.b = f;
11; }
12; (IR is modified so that d's struct type is forward declared.)
13
14; Check that the global variable "d" is not
15; emitted as a fragment if its struct type is
16; forward declared but d.c has zero length, so
17; a fragment shouldn't be emitted.
18
19source_filename = "t.c"
20target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
21target triple = "x86_64-unknown-linux-gnu"
22
23%struct.anon = type { i64, %struct.a }
24%struct.a = type {}
25
26; CHECK: @d.0 = internal unnamed_addr global i64 0, align 8, !dbg ![[GVE:.*]]
27@d = internal global %struct.anon zeroinitializer, align 8, !dbg !0
28
29; Function Attrs: noinline nounwind uwtable
30define dso_local i32 @e() #0 !dbg !18 {
31entry:
32  %0 = load i64, i64* getelementptr inbounds (%struct.anon, %struct.anon* @d, i32 0, i32 0), align 8
33  %add = add nsw i64 %0, 1
34  call void @llvm.dbg.value(metadata i64 %add, metadata !24, metadata !DIExpression()), !dbg !25
35  store i64 %add, i64* getelementptr inbounds (%struct.anon, %struct.anon* @d, i32 0, i32 0), align 8
36  ret i32 undef
37}
38
39; Function Attrs: nounwind readnone speculatable willreturn
40declare void @llvm.dbg.declare(metadata, metadata, metadata)
41
42; Function Attrs: nounwind readnone speculatable willreturn
43declare void @llvm.dbg.value(metadata, metadata, metadata)
44
45!llvm.dbg.cu = !{!2}
46!llvm.module.flags = !{!14, !15}
47
48; CHECK: ![[GVE]] = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
49!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
50!1 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 6, type: !7, isLocal: true, isDefinition: true)
51!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !{}, globals: !{!0}, splitDebugInlining: false, nameTableKind: None)
52!3 = !DIFile(filename: "t.c", directory: "/")
53!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 3, flags: DIFlagFwdDecl)
54!10 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
55!12 = !DIDerivedType(tag: DW_TAG_typedef, name: "a", file: !3, line: 2, baseType: !13)
56!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, elements: !{})
57!14 = !{i32 7, !"Dwarf Version", i32 4}
58!15 = !{i32 2, !"Debug Info Version", i32 3}
59!18 = distinct !DISubprogram(name: "e", scope: !3, file: !3, line: 7, type: !19, scopeLine: 7, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !{})
60!19 = !DISubroutineType(types: !{!21})
61!21 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
62!24 = !DILocalVariable(name: "f", scope: !18, file: !3, line: 8, type: !10)
63!25 = !DILocation(line: 0, scope: !18)
64