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