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1; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t12; RUN: llc -o - %t1 | FileCheck %s3;4; Source:5; #pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)6; typedef struct {7; union {8; void *kernel;9; void *user;10; };11; unsigned is_kernel : 1;12; } sockptr_t;13; #pragma clang attribute pop14; int test(sockptr_t *arg) {15; return arg->is_kernel;16; }17; Compilation flag:18; clang -target bpf -O2 -S -emit-llvm -g -Xclang -disable-llvm-passes test.c19 20%struct.sockptr_t = type { %union.anon, i8 }21%union.anon = type { ptr }22 23; Function Attrs: nounwind24define dso_local i32 @test(ptr noundef %arg) #0 !dbg !7 {25entry:26 %arg.addr = alloca ptr, align 827 store ptr %arg, ptr %arg.addr, align 8, !tbaa !2528 call void @llvm.dbg.declare(metadata ptr %arg.addr, metadata !24, metadata !DIExpression()), !dbg !2929 %0 = load ptr, ptr %arg.addr, align 8, !dbg !30, !tbaa !2530 %1 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.sockptr_t) %0, i32 1, i32 1), !dbg !31, !llvm.preserve.access.index !1331 %bf.load = load i8, ptr %1, align 8, !dbg !3132 %bf.clear = and i8 %bf.load, 1, !dbg !3133 %bf.cast = zext i8 %bf.clear to i32, !dbg !3134 ret i32 %bf.cast, !dbg !3235}36 37; CHECK: .long 1 # BTF_KIND_TYPEDEF(id = 2)38; CHECK-NEXT: .long 134217728 # 0x800000039; CHECK-NEXT: .long 340; CHECK-NEXT: .long 0 # BTF_KIND_STRUCT(id = 3)41 42; CHECK: .ascii "sockptr_t" # string offset=143; CHECK: .ascii ".text" # string offset=5944; CHECK: .ascii "0:1" # string offset=6545 46; CHECK: .long 16 # FieldReloc47; CHECK-NEXT: .long 59 # Field reloc section string offset=5948; CHECK-NEXT: .long 149; CHECK-NEXT: .long .Ltmp[[#]]50; CHECK-NEXT: .long 251; CHECK-NEXT: .long 6552; CHECK-NEXT: .long 053 54; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn55declare void @llvm.dbg.declare(metadata, metadata, metadata) #156 57; Function Attrs: nocallback nofree nosync nounwind readnone willreturn58declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #259 60attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }61attributes #1 = { nocallback nofree nosync nounwind readnone speculatable willreturn }62attributes #2 = { nocallback nofree nosync nounwind readnone willreturn }63 64!llvm.dbg.cu = !{!0}65!llvm.module.flags = !{!2, !3, !4, !5}66!llvm.ident = !{!6}67 68!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 15.0.0 (https://github.com/llvm/llvm-project.git d81a8759c969344c1e96992aab30f5b5a9d5ffd3)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)69!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/test/anon", checksumkind: CSK_MD5, checksum: "7ba33bf2146cc86b1c8396f6d3eace81")70!2 = !{i32 7, !"Dwarf Version", i32 5}71!3 = !{i32 2, !"Debug Info Version", i32 3}72!4 = !{i32 1, !"wchar_size", i32 4}73!5 = !{i32 7, !"frame-pointer", i32 2}74!6 = !{!"clang version 15.0.0 (https://github.com/llvm/llvm-project.git d81a8759c969344c1e96992aab30f5b5a9d5ffd3)"}75!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 10, type: !8, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23)76!8 = !DISubroutineType(types: !9)77!9 = !{!10, !11}78!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)79!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)80!12 = !DIDerivedType(tag: DW_TAG_typedef, name: "sockptr_t", file: !1, line: 8, baseType: !13)81!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !1, line: 2, size: 128, elements: !14)82!14 = !{!15, !21}83!15 = !DIDerivedType(tag: DW_TAG_member, scope: !13, file: !1, line: 3, baseType: !16, size: 64)84!16 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !13, file: !1, line: 3, size: 64, elements: !17)85!17 = !{!18, !20}86!18 = !DIDerivedType(tag: DW_TAG_member, name: "kernel", scope: !16, file: !1, line: 4, baseType: !19, size: 64)87!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)88!20 = !DIDerivedType(tag: DW_TAG_member, name: "user", scope: !16, file: !1, line: 5, baseType: !19, size: 64)89!21 = !DIDerivedType(tag: DW_TAG_member, name: "is_kernel", scope: !13, file: !1, line: 7, baseType: !22, size: 1, offset: 64, flags: DIFlagBitField, extraData: i64 64)90!22 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)91!23 = !{!24}92!24 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 10, type: !11)93!25 = !{!26, !26, i64 0}94!26 = !{!"any pointer", !27, i64 0}95!27 = !{!"omnipotent char", !28, i64 0}96!28 = !{!"Simple C/C++ TBAA"}97!29 = !DILocation(line: 10, column: 21, scope: !7)98!30 = !DILocation(line: 11, column: 10, scope: !7)99!31 = !DILocation(line: 11, column: 15, scope: !7)100!32 = !DILocation(line: 11, column: 3, scope: !7)101