1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Source: 4; #define __ctx __attribute__((preserve_static_offset)) 5; #define __pai __attribute__((preserve_access_index)) 6; 7; struct foo { 8; char a[10]; 9; } __pai; 10; 11; struct bar { 12; int a; 13; int b; 14; } __pai; 15; 16; union buz { 17; struct foo a; 18; struct bar b; 19; } __pai __ctx; 20; 21; int quux(union buz *p) { 22; return p->b.b; 23; } 24; 25; Compilation flag: 26; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -debug-info-kind=limited -o - \ 27; | opt -passes=function(sroa) -S -o - 28 29%struct.bar = type { i32, i32 } 30 31; Function Attrs: nounwind 32define dso_local i32 @quux(ptr noundef %p) #0 !dbg !5 { 33entry: 34 call void @llvm.dbg.value(metadata ptr %p, metadata !26, metadata !DIExpression()), !dbg !27 35 %0 = call ptr @llvm.preserve.static.offset(ptr %p), !dbg !28 36 %1 = call ptr @llvm.preserve.union.access.index.p0.p0(ptr %0, i32 1), !dbg !28, !llvm.preserve.access.index !10 37 %2 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%struct.bar) %1, i32 1, i32 1), !dbg !29, !llvm.preserve.access.index !21 38 %3 = load i32, ptr %2, align 4, !dbg !29, !tbaa !30 39 ret i32 %3, !dbg !33 40} 41 42; CHECK: define dso_local i32 @quux(ptr noundef %[[p:.*]]) {{.*}} { 43; CHECK-NEXT: entry: 44; CHECK-NEXT: #dbg_value 45; CHECK-NEXT: %[[v5:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...) 46; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32 47; CHECK-SAME: (ptr readonly elementtype(%struct.bar) %[[p]], 48; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1) 49; CHECK-SAME: #[[v6:.*]], !tbaa 50; CHECK-NEXT: ret i32 %[[v5]] 51; CHECK-NEXT: } 52; CHECK: attributes #[[v6]] = { memory(argmem: read) } 53 54; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 55declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 56 57; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 58declare ptr @llvm.preserve.static.offset(ptr readnone) #1 59 60; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none) 61declare ptr @llvm.preserve.union.access.index.p0.p0(ptr, i32 immarg) #2 62 63; Function Attrs: nocallback nofree nosync nounwind willreturn memory(none) 64declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #2 65 66; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 67declare void @llvm.dbg.value(metadata, metadata, metadata) #1 68 69attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 70attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 71attributes #2 = { nocallback nofree nosync nounwind willreturn memory(none) } 72 73!llvm.dbg.cu = !{!0} 74!llvm.module.flags = !{!2, !3} 75!llvm.ident = !{!4} 76 77!0 = distinct !DICompileUnit(language: DW_LANG_C11, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None) 78!1 = !DIFile(filename: "some-file.c", directory: "/some/dir/") 79!2 = !{i32 2, !"Debug Info Version", i32 3} 80!3 = !{i32 1, !"wchar_size", i32 4} 81!4 = !{!"clang"} 82!5 = distinct !DISubprogram(name: "quux", scope: !1, file: !1, line: 18, type: !6, scopeLine: 18, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !25) 83!6 = !DISubroutineType(types: !7) 84!7 = !{!8, !9} 85!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 86!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64) 87!10 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "buz", file: !1, line: 13, size: 96, elements: !11) 88!11 = !{!12, !20} 89!12 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !10, file: !1, line: 14, baseType: !13, size: 80) 90!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "foo", file: !1, line: 4, size: 80, elements: !14) 91!14 = !{!15} 92!15 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !13, file: !1, line: 5, baseType: !16, size: 80) 93!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !17, size: 80, elements: !18) 94!17 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char) 95!18 = !{!19} 96!19 = !DISubrange(count: 10) 97!20 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !10, file: !1, line: 15, baseType: !21, size: 64) 98!21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "bar", file: !1, line: 8, size: 64, elements: !22) 99!22 = !{!23, !24} 100!23 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !21, file: !1, line: 9, baseType: !8, size: 32) 101!24 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !21, file: !1, line: 10, baseType: !8, size: 32, offset: 32) 102!25 = !{!26} 103!26 = !DILocalVariable(name: "p", arg: 1, scope: !5, file: !1, line: 18, type: !9) 104!27 = !DILocation(line: 0, scope: !5) 105!28 = !DILocation(line: 19, column: 13, scope: !5) 106!29 = !DILocation(line: 19, column: 15, scope: !5) 107!30 = !{!31, !31, i64 0} 108!31 = !{!"omnipotent char", !32, i64 0} 109!32 = !{!"Simple C/C++ TBAA"} 110!33 = !DILocation(line: 19, column: 3, scope: !5) 111