1; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1 2; RUN: llc -o - %t1 | FileCheck %s 3; 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 pop 14; 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.c 19 20%struct.sockptr_t = type { %union.anon, i8 } 21%union.anon = type { ptr } 22 23; Function Attrs: nounwind 24define dso_local i32 @test(ptr noundef %arg) #0 !dbg !7 { 25entry: 26 %arg.addr = alloca ptr, align 8 27 store ptr %arg, ptr %arg.addr, align 8, !tbaa !25 28 call void @llvm.dbg.declare(metadata ptr %arg.addr, metadata !24, metadata !DIExpression()), !dbg !29 29 %0 = load ptr, ptr %arg.addr, align 8, !dbg !30, !tbaa !25 30 %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 !13 31 %bf.load = load i8, ptr %1, align 8, !dbg !31 32 %bf.clear = and i8 %bf.load, 1, !dbg !31 33 %bf.cast = zext i8 %bf.clear to i32, !dbg !31 34 ret i32 %bf.cast, !dbg !32 35} 36 37; CHECK: .long 1 # BTF_KIND_TYPEDEF(id = 2) 38; CHECK-NEXT: .long 134217728 # 0x8000000 39; CHECK-NEXT: .long 3 40; CHECK-NEXT: .long 0 # BTF_KIND_STRUCT(id = 3) 41 42; CHECK: .ascii "sockptr_t" # string offset=1 43; CHECK: .ascii ".text" # string offset=59 44; CHECK: .ascii "0:1" # string offset=65 45 46; CHECK: .long 16 # FieldReloc 47; CHECK-NEXT: .long 59 # Field reloc section string offset=59 48; CHECK-NEXT: .long 1 49; CHECK-NEXT: .long .Ltmp[[#]] 50; CHECK-NEXT: .long 2 51; CHECK-NEXT: .long 65 52; CHECK-NEXT: .long 0 53 54; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn 55declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 56 57; Function Attrs: nocallback nofree nosync nounwind readnone willreturn 58declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #2 59 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