83 lines
4.1 KiB
LLVM
83 lines
4.1 KiB
LLVM
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; RUN: opt -O2 %s | llvm-dis > %t1
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; RUN: llc -filetype=asm -o - %t1 | FileCheck %s
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; RUN: llc -mattr=+alu32 -filetype=asm -o - %t1 | FileCheck %s
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;
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; Source code:
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; struct s { int a; int b; };
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; #define _(x) (__builtin_preserve_access_index(x))
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; int get_value(const void *addr);
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; int test(struct s *arg) { return get_value(_(&arg->b)); }
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; Compiler flag to generate IR:
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; clang -target bpf -S -O2 -g -emit-llvm -Xclang -disable-llvm-passes test.c
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target triple = "bpf"
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%struct.s = type { i32, i32 }
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; Function Attrs: nounwind
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define dso_local i32 @test(%struct.s* %arg) local_unnamed_addr #0 !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata %struct.s* %arg, metadata !17, metadata !DIExpression()), !dbg !18
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%0 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s* %arg, i32 1, i32 1), !dbg !19, !llvm.preserve.access.index !12
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%1 = bitcast i32* %0 to i8*, !dbg !19
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%call = tail call i32 @get_value(i8* %1) #4, !dbg !20
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ret i32 %call, !dbg !21
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}
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; CHECK-LABEL: test
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; CHECK: [[RELOC:.Ltmp[0-9]+]]
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; CHECK: r2 = 4
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; CHECK: r1 += r2
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; CHECK: call get_value
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; CHECK: exit
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;
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; CHECK: .section .BTF.ext,"",@progbits
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; CHECK: .long 16 # FieldReloc
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; CHECK-NEXT: .long 20 # Field reloc section string offset=20
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long [[RELOC]]
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 26
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; CHECK-NEXT: .long 0
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declare dso_local i32 @get_value(i8*) local_unnamed_addr #1
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; Function Attrs: nounwind readnone
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declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.ss(%struct.s*, i32 immarg, i32 immarg) #2
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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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" }
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attributes #1 = { "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "frame-pointer"="all" "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" }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind readnone speculatable }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!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 9.0.0 (trunk 365789)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/core")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 9.0.0 (trunk 365789)"}
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!7 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !8, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!12 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 64, elements: !13)
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!13 = !{!14, !15}
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !12, file: !1, line: 1, baseType: !10, size: 32)
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !12, file: !1, line: 1, baseType: !10, size: 32, offset: 32)
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!16 = !{!17}
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!17 = !DILocalVariable(name: "arg", arg: 1, scope: !7, file: !1, line: 4, type: !11)
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!18 = !DILocation(line: 0, scope: !7)
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!19 = !DILocation(line: 4, column: 44, scope: !7)
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!20 = !DILocation(line: 4, column: 34, scope: !7)
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!21 = !DILocation(line: 4, column: 27, scope: !7)
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