125 lines
6.3 KiB
LLVM
125 lines
6.3 KiB
LLVM
; RUN: opt -O2 -mtriple=bpf-pc-linux %s | llvm-dis > %t1
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; RUN: llc -o - %t1 | FileCheck %s
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;
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; Source:
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; typedef union {
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; struct {
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; void *kernel;
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; void *user;
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; };
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; unsigned is_kernel : 1;
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; } __attribute__((preserve_access_index)) sockptr_t;
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; void *foo(void);
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; int test() {
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; sockptr_t *arg = foo();
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; return __builtin_preserve_field_info(arg->is_kernel, 1);
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; }
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; Compilation flag:
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; clang -target bpf -O2 -S -emit-llvm -g -Xclang -disable-llvm-passes test.c
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%union.sockptr_t = type { %struct.anon }
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%struct.anon = type { ptr, ptr }
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; Function Attrs: nounwind
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define dso_local i32 @test() #0 !dbg !7 {
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entry:
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%arg = alloca ptr, align 8
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call void @llvm.lifetime.start.p0(i64 8, ptr %arg) #6, !dbg !25
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call void @llvm.dbg.declare(metadata ptr %arg, metadata !12, metadata !DIExpression()), !dbg !26
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%call = call ptr @foo(), !dbg !27
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store ptr %call, ptr %arg, align 8, !dbg !26, !tbaa !28
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%0 = load ptr, ptr %arg, align 8, !dbg !32, !tbaa !28
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%1 = call ptr @llvm.preserve.struct.access.index.p0.p0(ptr elementtype(%union.sockptr_t) %0, i32 0, i32 1), !dbg !33, !llvm.preserve.access.index !15
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%2 = call i32 @llvm.bpf.preserve.field.info.p0(ptr %1, i64 1), !dbg !34
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call void @llvm.lifetime.end.p0(i64 8, ptr %arg) #6, !dbg !35
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ret i32 %2, !dbg !36
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}
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; CHECK: .long 56 # BTF_KIND_TYPEDEF(id = 7)
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; CHECK-NEXT: .long 134217728 # 0x8000000
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; CHECK-NEXT: .long 8
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; CHECK-NEXT: .long 0 # BTF_KIND_UNION(id = 8)
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; CHECK: .ascii ".text" # string offset=10
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; CHECK: .ascii "sockptr_t" # string offset=56
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; CHECK: .ascii "0:1" # string offset=101
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; CHECK: .long 16 # FieldReloc
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; CHECK-NEXT: .long 10 # Field reloc section string offset=10
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long .Ltmp[[#]]
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; CHECK-NEXT: .long 7
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; CHECK-NEXT: .long 101
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; CHECK-NEXT: .long 1
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; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
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declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
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; Function Attrs: nocallback nofree nosync nounwind readnone speculatable willreturn
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
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declare !dbg !37 dso_local ptr @foo() #3
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; Function Attrs: nocallback nofree nosync nounwind readnone willreturn
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declare ptr @llvm.preserve.struct.access.index.p0.p0(ptr, i32 immarg, i32 immarg) #4
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; Function Attrs: nounwind readnone
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declare i32 @llvm.bpf.preserve.field.info.p0(ptr, i64 immarg) #5
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; Function Attrs: argmemonly nocallback nofree nosync nounwind willreturn
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declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
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attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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attributes #1 = { argmemonly nocallback nofree nosync nounwind willreturn }
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attributes #2 = { nocallback nofree nosync nounwind readnone speculatable willreturn }
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attributes #3 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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attributes #4 = { nocallback nofree nosync nounwind readnone willreturn }
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attributes #5 = { nounwind readnone }
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attributes #6 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 15.0.0 (https://github.com/llvm/llvm-project.git 8c7d5118961e7ffc0304126ec2122d21e2eb1f79)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/test/anon", checksumkind: CSK_MD5, checksum: "03904da5c5e53b14bb1effb6d9d5e025")
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!2 = !{i32 7, !"Dwarf Version", i32 5}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"frame-pointer", i32 2}
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!6 = !{!"clang version 15.0.0 (https://github.com/llvm/llvm-project.git 8c7d5118961e7ffc0304126ec2122d21e2eb1f79)"}
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!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 9, type: !8, scopeLine: 9, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "arg", scope: !7, file: !1, line: 10, type: !13)
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
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!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "sockptr_t", file: !1, line: 7, baseType: !15)
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!15 = distinct !DICompositeType(tag: DW_TAG_union_type, file: !1, line: 1, size: 128, elements: !16)
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!16 = !{!17, !23}
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!17 = !DIDerivedType(tag: DW_TAG_member, scope: !15, file: !1, line: 2, baseType: !18, size: 128)
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!18 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !15, file: !1, line: 2, size: 128, elements: !19)
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!19 = !{!20, !22}
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!20 = !DIDerivedType(tag: DW_TAG_member, name: "kernel", scope: !18, file: !1, line: 3, baseType: !21, size: 64)
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!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!22 = !DIDerivedType(tag: DW_TAG_member, name: "user", scope: !18, file: !1, line: 4, baseType: !21, size: 64, offset: 64)
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!23 = !DIDerivedType(tag: DW_TAG_member, name: "is_kernel", scope: !15, file: !1, line: 6, baseType: !24, size: 1, flags: DIFlagBitField, extraData: i64 0)
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!24 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!25 = !DILocation(line: 10, column: 3, scope: !7)
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!26 = !DILocation(line: 10, column: 14, scope: !7)
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!27 = !DILocation(line: 10, column: 20, scope: !7)
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!28 = !{!29, !29, i64 0}
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!29 = !{!"any pointer", !30, i64 0}
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!30 = !{!"omnipotent char", !31, i64 0}
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!31 = !{!"Simple C/C++ TBAA"}
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!32 = !DILocation(line: 11, column: 40, scope: !7)
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!33 = !DILocation(line: 11, column: 45, scope: !7)
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!34 = !DILocation(line: 11, column: 10, scope: !7)
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!35 = !DILocation(line: 12, column: 1, scope: !7)
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!36 = !DILocation(line: 11, column: 3, scope: !7)
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!37 = !DISubprogram(name: "foo", scope: !1, file: !1, line: 8, type: !38, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !40)
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!38 = !DISubroutineType(types: !39)
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!39 = !{!21}
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!40 = !{}
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