; RUN: opt -O2 %s | llvm-dis > %t1
; RUN: llc -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s
; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck -check-prefixes=CHECK %s
; Source code:
; struct net_device {
; int dev_id;
; int others;
; };
; struct sk_buff {
; int i;
; struct net_device dev;
; };
; #define _(x) (__builtin_preserve_access_index(x))
; static int (*bpf_probe_read)(ptr dst, int size, ptr unsafe_ptr)
; = (ptr) 4;
;
; int bpf_prog(struct sk_buff *ctx) {
; int dev_id;
; bpf_probe_read(&dev_id, sizeof(int), _(&ctx->dev.dev_id));
; return dev_id;
; }
; Compilation flag:
; clang -target bpf -O2 -g -S -emit-llvm -Xclang -disable-llvm-passes test.c
target triple = "bpf"
%struct.sk_buff = type { i32, %struct.net_device }
%struct.net_device = type { i32, i32 }
; Function Attrs: nounwind
define dso_local i32 @bpf_prog(ptr) local_unnamed_addr #0 !dbg !15 {
%2 = alloca i32, align 4
call void @llvm.dbg.value(metadata ptr %0, metadata !28, metadata !DIExpression()), !dbg !30
call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #4, !dbg !31
%3 = tail call ptr @llvm.preserve.struct.access.index.p0.net_devices.p0.sk_buffs(ptr elementtype(%struct.sk_buff) %0, i32 1, i32 1), !dbg !32, !llvm.preserve.access.index !19
%4 = tail call ptr @llvm.preserve.struct.access.index.p0.p0.net_devices(ptr elementtype(%struct.net_device) %3, i32 0, i32 0), !dbg !32, !llvm.preserve.access.index !23
%5 = call i32 inttoptr (i64 4 to ptr)(ptr nonnull %2, i32 4, ptr %4) #4, !dbg !33
%6 = load i32, ptr %2, align 4, !dbg !34, !tbaa !35
call void @llvm.dbg.value(metadata i32 %6, metadata !29, metadata !DIExpression()), !dbg !30
call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #4, !dbg !39
ret i32 %6, !dbg !40
}
; CHECK: .section .BTF,"",@progbits
; CHECK-NEXT: .short 60319 # 0xeb9f
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .long 24
; CHECK-NEXT: .long 0
; CHECK-NEXT: .long 132
; CHECK-NEXT: .long 132
; CHECK-NEXT: .long 106
; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1)
; CHECK-NEXT: .long 33554432 # 0x2000000
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 2)
; CHECK-NEXT: .long 67108866 # 0x4000002
; CHECK-NEXT: .long 12
; CHECK-NEXT: .long 9
; CHECK-NEXT: .long 3
; CHECK-NEXT: .long 0 # 0x0
; CHECK-NEXT: .long 11
; CHECK-NEXT: .long 4
; CHECK-NEXT: .long 32 # 0x20
; CHECK-NEXT: .long 15 # BTF_KIND_INT(id = 3)
; CHECK-NEXT: .long 16777216 # 0x1000000
; CHECK-NEXT: .long 4
; CHECK-NEXT: .long 16777248 # 0x1000020
; CHECK-NEXT: .long 19 # BTF_KIND_STRUCT(id = 4)
; CHECK-NEXT: .long 67108866 # 0x4000002
; CHECK-NEXT: .long 8
; CHECK-NEXT: .long 30
; CHECK-NEXT: .long 3
; CHECK-NEXT: .long 0 # 0x0
; CHECK-NEXT: .long 37
; CHECK-NEXT: .long 3
; CHECK-NEXT: .long 32 # 0x20
; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 5)
; CHECK-NEXT: .long 218103809 # 0xd000001
; CHECK-NEXT: .long 3
; CHECK-NEXT: .long 44
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long 48 # BTF_KIND_FUNC(id = 6)
; CHECK-NEXT: .long 201326593 # 0xc000001
; CHECK-NEXT: .long 5
; CHECK-NEXT: .byte 0 # string offset=0
; CHECK-NEXT: .ascii "sk_buff" # string offset=1
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .byte 105 # string offset=9
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "dev" # string offset=11
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "int" # string offset=15
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "net_device" # string offset=19
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "dev_id" # string offset=30
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "others" # string offset=37
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "ctx" # string offset=44
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "bpf_prog" # string offset=48
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii ".text" # string offset=57
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=63
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .ascii "0:1:0" # string offset=100
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .section .BTF.ext,"",@progbits
; CHECK-NEXT: .short 60319 # 0xeb9f
; CHECK-NEXT: .byte 1
; CHECK-NEXT: .byte 0
; CHECK-NEXT: .long 32
; CHECK-NEXT: .long 0
; CHECK-NEXT: .long 20
; CHECK-NEXT: .long 20
; CHECK-NEXT: .long {{[0-9]+}}
; CHECK-NEXT: .long {{[0-9]+}}
; CHECK-NEXT: .long 28
; CHECK-NEXT: .long 8 # FuncInfo
; CHECK: .long 16 # FieldReloc
; CHECK-NEXT: .long 57 # Field reloc section string offset=57
; CHECK-NEXT: .long 1
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long 100
; CHECK-NEXT: .long 0
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
; Function Attrs: nounwind readnone
declare ptr @llvm.preserve.struct.access.index.p0.net_devices.p0.sk_buffs(ptr, i32 immarg, i32 immarg) #2
; Function Attrs: nounwind readnone
declare ptr @llvm.preserve.struct.access.index.p0.p0.net_devices(ptr, i32 immarg, i32 immarg) #2
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #3
attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "frame-pointer"="all" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { argmemonly nounwind }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind readnone speculatable }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!11, !12, !13}
!llvm.ident = !{!14}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm")
!2 = !{}
!3 = !{!4}
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 10, type: !6, isLocal: true, isDefinition: true)
!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
!7 = !DISubroutineType(types: !8)
!8 = !{!9, !10, !9, !10}
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
!11 = !{i32 2, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"}
!15 = distinct !DISubprogram(name: "bpf_prog", scope: !1, file: !1, line: 13, type: !16, scopeLine: 13, flags: DIFlagPrototyped, isLocal: false, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !27)
!16 = !DISubroutineType(types: !17)
!17 = !{!9, !18}
!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 5, size: 96, elements: !20)
!20 = !{!21, !22}
!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 6, baseType: !9, size: 32)
!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 7, baseType: !23, size: 64, offset: 32)
!23 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "net_device", file: !1, line: 1, size: 64, elements: !24)
!24 = !{!25, !26}
!25 = !DIDerivedType(tag: DW_TAG_member, name: "dev_id", scope: !23, file: !1, line: 2, baseType: !9, size: 32)
!26 = !DIDerivedType(tag: DW_TAG_member, name: "others", scope: !23, file: !1, line: 3, baseType: !9, size: 32, offset: 32)
!27 = !{!28, !29}
!28 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 13, type: !18)
!29 = !DILocalVariable(name: "dev_id", scope: !15, file: !1, line: 14, type: !9)
!30 = !DILocation(line: 0, scope: !15)
!31 = !DILocation(line: 14, column: 3, scope: !15)
!32 = !DILocation(line: 15, column: 40, scope: !15)
!33 = !DILocation(line: 15, column: 3, scope: !15)
!34 = !DILocation(line: 16, column: 10, scope: !15)
!35 = !{!36, !36, i64 0}
!36 = !{!"int", !37, i64 0}
!37 = !{!"omnipotent char", !38, i64 0}
!38 = !{!"Simple C/C++ TBAA"}
!39 = !DILocation(line: 17, column: 1, scope: !15)
!40 = !DILocation(line: 16, column: 3, scope: !15)
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