| ; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s |
| ; Source code: |
| ; struct s { |
| ; int a; |
| ; int b1:9; |
| ; int b2:4; |
| ; }; |
| ; enum { |
| ; FIELD_BYTE_OFFSET = 0, |
| ; FIELD_BYTE_SIZE, |
| ; FIELD_EXISTENCE, |
| ; FIELD_SIGNEDNESS, |
| ; FIELD_LSHIFT_U64, |
| ; FIELD_RSHIFT_U64, |
| ; }; |
| ; void bpf_probe_read(void *, unsigned, const void *); |
| ; int field_read(struct s *arg) { |
| ; unsigned long long ull; |
| ; unsigned offset = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_OFFSET); |
| ; unsigned size = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_SIZE); |
| ; unsigned lshift; |
| ; |
| ; bpf_probe_read(&ull, size, (const void *)arg + offset); |
| ; lshift = __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64); |
| ; #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ |
| ; lshift = lshift + (size << 3) - 64; |
| ; #endif |
| ; ull <<= lshift; |
| ; if (__builtin_preserve_field_info(arg->b2, FIELD_SIGNEDNESS)) |
| ; return (long long)ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64); |
| ; return ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64); |
| ; } |
| ; Compilation flag: |
| ; clang -target bpfel -O2 -g -S -emit-llvm test.c |
| |
| %struct.s = type { i32, i16 } |
| |
| ; Function Attrs: nounwind |
| define dso_local i32 @field_read(%struct.s* %arg) local_unnamed_addr #0 !dbg !20 { |
| entry: |
| %ull = alloca i64, align 8 |
| call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !31, metadata !DIExpression()), !dbg !37 |
| %0 = bitcast i64* %ull to i8*, !dbg !38 |
| call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %0) #5, !dbg !38 |
| %1 = tail call i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s* %arg, i32 1, i32 2), !dbg !39, !llvm.preserve.access.index !25 |
| %2 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 0), !dbg !40 |
| call void @llvm.dbg.value(metadata i32 %2, metadata !34, metadata !DIExpression()), !dbg !37 |
| %3 = tail call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 1), !dbg !41 |
| call void @llvm.dbg.value(metadata i32 %3, metadata !35, metadata !DIExpression()), !dbg !37 |
| %4 = bitcast %struct.s* %arg to i8*, !dbg !42 |
| %idx.ext = zext i32 %2 to i64, !dbg !43 |
| %add.ptr = getelementptr i8, i8* %4, i64 %idx.ext, !dbg !43 |
| call void @bpf_probe_read(i8* nonnull %0, i32 %3, i8* %add.ptr) #5, !dbg !44 |
| %5 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 4), !dbg !45 |
| call void @llvm.dbg.value(metadata i32 %5, metadata !36, metadata !DIExpression()), !dbg !37 |
| %6 = load i64, i64* %ull, align 8, !dbg !46, !tbaa !47 |
| call void @llvm.dbg.value(metadata i64 %6, metadata !32, metadata !DIExpression()), !dbg !37 |
| %sh_prom = zext i32 %5 to i64, !dbg !46 |
| %shl = shl i64 %6, %sh_prom, !dbg !46 |
| call void @llvm.dbg.value(metadata i64 %shl, metadata !32, metadata !DIExpression()), !dbg !37 |
| %7 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 3), !dbg !51 |
| %tobool = icmp eq i32 %7, 0, !dbg !51 |
| %8 = call i32 @llvm.bpf.preserve.field.info.p0i16(i16* %1, i64 5), !dbg !37 |
| %sh_prom1 = zext i32 %8 to i64, !dbg !37 |
| %shr = ashr i64 %shl, %sh_prom1, !dbg !53 |
| %shr3 = lshr i64 %shl, %sh_prom1, !dbg !53 |
| %retval.0.in = select i1 %tobool, i64 %shr3, i64 %shr, !dbg !53 |
| %retval.0 = trunc i64 %retval.0.in to i32, !dbg !37 |
| call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %0) #5, !dbg !54 |
| ret i32 %retval.0, !dbg !54 |
| } |
| |
| ; CHECK: r{{[0-9]+}} = 4 |
| ; CHECK: r{{[0-9]+}} = 4 |
| ; CHECK: r{{[0-9]+}} = 51 |
| ; CHECK: r{{[0-9]+}} = 60 |
| ; CHECK: r{{[0-9]+}} = 1 |
| |
| ; CHECK: .byte 115 # string offset=1 |
| ; CHECK: .ascii ".text" # string offset=30 |
| ; CHECK: .ascii "0:2" # string offset=73 |
| |
| ; CHECK: .long 16 # FieldReloc |
| ; CHECK-NEXT: .long 30 # Field reloc section string offset=30 |
| ; CHECK-NEXT: .long 5 |
| ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} |
| ; CHECK-NEXT: .long 2 |
| ; CHECK-NEXT: .long 73 |
| ; CHECK-NEXT: .long 0 |
| ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} |
| ; CHECK-NEXT: .long 2 |
| ; CHECK-NEXT: .long 73 |
| ; CHECK-NEXT: .long 1 |
| ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} |
| ; CHECK-NEXT: .long 2 |
| ; CHECK-NEXT: .long 73 |
| ; CHECK-NEXT: .long 4 |
| ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} |
| ; CHECK-NEXT: .long 2 |
| ; CHECK-NEXT: .long 73 |
| ; CHECK-NEXT: .long 5 |
| ; CHECK-NEXT: .long .Ltmp{{[0-9]+}} |
| ; CHECK-NEXT: .long 2 |
| ; CHECK-NEXT: .long 73 |
| ; CHECK-NEXT: .long 3 |
| |
| ; Function Attrs: argmemonly nounwind willreturn |
| declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1 |
| |
| ; Function Attrs: nounwind readnone |
| declare i16* @llvm.preserve.struct.access.index.p0i16.p0s_struct.ss(%struct.s*, i32, i32) #2 |
| |
| ; Function Attrs: nounwind readnone |
| declare i32 @llvm.bpf.preserve.field.info.p0i16(i16*, i64) #2 |
| |
| declare dso_local void @bpf_probe_read(i8*, i32, i8*) local_unnamed_addr #3 |
| |
| ; Function Attrs: argmemonly nounwind willreturn |
| declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1 |
| |
| ; Function Attrs: nounwind readnone speculatable willreturn |
| declare void @llvm.dbg.value(metadata, metadata, metadata) #4 |
| |
| attributes #0 = { nounwind "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "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 willreturn } |
| attributes #2 = { nounwind readnone } |
| attributes #3 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "no-infs-fp-math"="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 #4 = { nounwind readnone speculatable willreturn } |
| attributes #5 = { nounwind } |
| |
| !llvm.dbg.cu = !{!0} |
| !llvm.module.flags = !{!16, !17, !18} |
| !llvm.ident = !{!19} |
| |
| !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !12, nameTableKind: None) |
| !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core") |
| !2 = !{!3} |
| !3 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 6, baseType: !4, size: 32, elements: !5) |
| !4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned) |
| !5 = !{!6, !7, !8, !9, !10, !11} |
| !6 = !DIEnumerator(name: "FIELD_BYTE_OFFSET", value: 0, isUnsigned: true) |
| !7 = !DIEnumerator(name: "FIELD_BYTE_SIZE", value: 1, isUnsigned: true) |
| !8 = !DIEnumerator(name: "FIELD_EXISTENCE", value: 2, isUnsigned: true) |
| !9 = !DIEnumerator(name: "FIELD_SIGNEDNESS", value: 3, isUnsigned: true) |
| !10 = !DIEnumerator(name: "FIELD_LSHIFT_U64", value: 4, isUnsigned: true) |
| !11 = !DIEnumerator(name: "FIELD_RSHIFT_U64", value: 5, isUnsigned: true) |
| !12 = !{!13, !15} |
| !13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64) |
| !14 = !DIDerivedType(tag: DW_TAG_const_type, baseType: null) |
| !15 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed) |
| !16 = !{i32 2, !"Dwarf Version", i32 4} |
| !17 = !{i32 2, !"Debug Info Version", i32 3} |
| !18 = !{i32 1, !"wchar_size", i32 4} |
| !19 = !{!"clang version 10.0.0 (https://github.com/llvm/llvm-project.git 923aa0ce806f7739b754167239fee2c9a15e2f31)"} |
| !20 = distinct !DISubprogram(name: "field_read", scope: !1, file: !1, line: 15, type: !21, scopeLine: 15, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !30) |
| !21 = !DISubroutineType(types: !22) |
| !22 = !{!23, !24} |
| !23 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) |
| !24 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !25, size: 64) |
| !25 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !26) |
| !26 = !{!27, !28, !29} |
| !27 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !25, file: !1, line: 2, baseType: !23, size: 32) |
| !28 = !DIDerivedType(tag: DW_TAG_member, name: "b1", scope: !25, file: !1, line: 3, baseType: !23, size: 9, offset: 32, flags: DIFlagBitField, extraData: i64 32) |
| !29 = !DIDerivedType(tag: DW_TAG_member, name: "b2", scope: !25, file: !1, line: 4, baseType: !23, size: 4, offset: 41, flags: DIFlagBitField, extraData: i64 32) |
| !30 = !{!31, !32, !34, !35, !36} |
| !31 = !DILocalVariable(name: "arg", arg: 1, scope: !20, file: !1, line: 15, type: !24) |
| !32 = !DILocalVariable(name: "ull", scope: !20, file: !1, line: 16, type: !33) |
| !33 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned) |
| !34 = !DILocalVariable(name: "offset", scope: !20, file: !1, line: 17, type: !4) |
| !35 = !DILocalVariable(name: "size", scope: !20, file: !1, line: 18, type: !4) |
| !36 = !DILocalVariable(name: "lshift", scope: !20, file: !1, line: 19, type: !4) |
| !37 = !DILocation(line: 0, scope: !20) |
| !38 = !DILocation(line: 16, column: 3, scope: !20) |
| !39 = !DILocation(line: 17, column: 56, scope: !20) |
| !40 = !DILocation(line: 17, column: 21, scope: !20) |
| !41 = !DILocation(line: 18, column: 19, scope: !20) |
| !42 = !DILocation(line: 21, column: 30, scope: !20) |
| !43 = !DILocation(line: 21, column: 48, scope: !20) |
| !44 = !DILocation(line: 21, column: 3, scope: !20) |
| !45 = !DILocation(line: 22, column: 12, scope: !20) |
| !46 = !DILocation(line: 26, column: 7, scope: !20) |
| !47 = !{!48, !48, i64 0} |
| !48 = !{!"long long", !49, i64 0} |
| !49 = !{!"omnipotent char", !50, i64 0} |
| !50 = !{!"Simple C/C++ TBAA"} |
| !51 = !DILocation(line: 27, column: 7, scope: !52) |
| !52 = distinct !DILexicalBlock(scope: !20, file: !1, line: 27, column: 7) |
| !53 = !DILocation(line: 27, column: 7, scope: !20) |
| !54 = !DILocation(line: 30, column: 1, scope: !20) |
