d46a6a9e68
Previously, patchable extern relocations are introduced to patch external variables used for multi versioning in compile once, run everywhere use case. The load instruction will be converted into a move with an patchable immediate which can be changed by bpf loader on the host. The kernel verifier has evolved and is able to load and propagate constant values, so compiler relocation becomes unnecessary. This patch removed codes related to this. Differential Revision: https://reviews.llvm.org/D68760 llvm-svn: 374367
213 lines
11 KiB
LLVM
213 lines
11 KiB
LLVM
; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
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; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
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; Source code:
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; struct sk_buff {
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; int i;
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; struct {
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; int dev_id;
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; int others;
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; } dev[10];
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; };
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; #define _(x) (__builtin_preserve_access_index(x))
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; static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr)
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; = (void *) 4;
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;
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; int bpf_prog(struct sk_buff *ctx) {
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; int dev_id;
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; bpf_probe_read(&dev_id, sizeof(int), _(&ctx->dev[5].dev_id));
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; return dev_id;
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; }
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; Compilation flag:
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; clang -target bpf -O2 -g -S -emit-llvm test.c
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%struct.sk_buff = type { i32, [10 x %struct.anon] }
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%struct.anon = type { i32, i32 }
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; Function Attrs: nounwind
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define dso_local i32 @bpf_prog(%struct.sk_buff*) local_unnamed_addr #0 !dbg !15 {
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%2 = alloca i32, align 4
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call void @llvm.dbg.value(metadata %struct.sk_buff* %0, metadata !31, metadata !DIExpression()), !dbg !33
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%3 = bitcast i32* %2 to i8*, !dbg !34
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call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %3) #4, !dbg !34
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%4 = tail call [10 x %struct.anon]* @llvm.preserve.struct.access.index.p0a10s_struct.anons.p0s_struct.sk_buffs(%struct.sk_buff* %0, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !19
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%5 = tail call %struct.anon* @llvm.preserve.array.access.index.p0s_struct.anons.p0a10s_struct.anons([10 x %struct.anon]* %4, i32 1, i32 5), !dbg !35, !llvm.preserve.access.index !23
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%6 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.anons(%struct.anon* %5, i32 0, i32 0), !dbg !35, !llvm.preserve.access.index !24
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%7 = bitcast i32* %6 to i8*, !dbg !35
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%8 = call i32 inttoptr (i64 4 to i32 (i8*, i32, i8*)*)(i8* nonnull %3, i32 4, i8* %7) #4, !dbg !36
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%9 = load i32, i32* %2, align 4, !dbg !37, !tbaa !38
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call void @llvm.dbg.value(metadata i32 %9, metadata !32, metadata !DIExpression()), !dbg !33
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call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %3) #4, !dbg !42
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ret i32 %9, !dbg !43
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}
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; CHECK: .section .BTF,"",@progbits
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; CHECK-NEXT: .short 60319 # 0xeb9f
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; CHECK-NEXT: .byte 1
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .long 24
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; CHECK-NEXT: .long 0
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; CHECK-NEXT: .long 172
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; CHECK-NEXT: .long 172
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; CHECK-NEXT: .long 117
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; CHECK-NEXT: .long 0 # BTF_KIND_PTR(id = 1)
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; CHECK-NEXT: .long 33554432 # 0x2000000
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 2)
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; CHECK-NEXT: .long 67108866 # 0x4000002
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; CHECK-NEXT: .long 84
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; CHECK-NEXT: .long 9
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; CHECK-NEXT: .long 3
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; CHECK-NEXT: .long 0 # 0x0
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; CHECK-NEXT: .long 11
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; CHECK-NEXT: .long 5
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; CHECK-NEXT: .long 32 # 0x20
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; CHECK-NEXT: .long 15 # BTF_KIND_INT(id = 3)
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; CHECK-NEXT: .long 16777216 # 0x1000000
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; CHECK-NEXT: .long 4
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; CHECK-NEXT: .long 16777248 # 0x1000020
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; CHECK-NEXT: .long 0 # BTF_KIND_STRUCT(id = 4)
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; CHECK-NEXT: .long 67108866 # 0x4000002
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; CHECK-NEXT: .long 8
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; CHECK-NEXT: .long 19
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; CHECK-NEXT: .long 3
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; CHECK-NEXT: .long 0 # 0x0
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; CHECK-NEXT: .long 26
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; CHECK-NEXT: .long 3
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; CHECK-NEXT: .long 32 # 0x20
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; CHECK-NEXT: .long 0 # BTF_KIND_ARRAY(id = 5)
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; CHECK-NEXT: .long 50331648 # 0x3000000
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; CHECK-NEXT: .long 0
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; CHECK-NEXT: .long 4
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; CHECK-NEXT: .long 6
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; CHECK-NEXT: .long 10
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; CHECK-NEXT: .long 33 # BTF_KIND_INT(id = 6)
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; CHECK-NEXT: .long 16777216 # 0x1000000
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; CHECK-NEXT: .long 4
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; CHECK-NEXT: .long 32 # 0x20
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; CHECK-NEXT: .long 0 # BTF_KIND_FUNC_PROTO(id = 7)
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; CHECK-NEXT: .long 218103809 # 0xd000001
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; CHECK-NEXT: .long 3
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; CHECK-NEXT: .long 53
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long 57 # BTF_KIND_FUNC(id = 8)
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; CHECK-NEXT: .long 201326592 # 0xc000000
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; CHECK-NEXT: .long 7
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; CHECK-NEXT: .byte 0 # string offset=0
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; CHECK-NEXT: .ascii "sk_buff" # string offset=1
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .byte 105 # string offset=9
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "dev" # string offset=11
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "int" # string offset=15
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "dev_id" # string offset=19
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "others" # string offset=26
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "__ARRAY_SIZE_TYPE__" # string offset=33
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "ctx" # string offset=53
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "bpf_prog" # string offset=57
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii ".text" # string offset=66
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "/tmp/home/yhs/work/tests/llvm/test.c" # string offset=72
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "0:1:5:0" # string offset=109
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .section .BTF.ext,"",@progbits
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; CHECK-NEXT: .short 60319 # 0xeb9f
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; CHECK-NEXT: .byte 1
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .long 32
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; CHECK-NEXT: .long 0
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; CHECK-NEXT: .long 20
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; CHECK-NEXT: .long 20
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; CHECK-NEXT: .long 76
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; CHECK-NEXT: .long 96
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; CHECK-NEXT: .long 28
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; CHECK-NEXT: .long 8 # FuncInfo
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; CHECK: .long 16 # FieldReloc
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; CHECK-NEXT: .long 66 # Field reloc section string offset=66
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long .Ltmp2
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; CHECK-NEXT: .long 2
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; CHECK-NEXT: .long 109
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; CHECK-NEXT: .long 0
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
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; Function Attrs: nounwind readnone
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declare [10 x %struct.anon]* @llvm.preserve.struct.access.index.p0a10s_struct.anons.p0s_struct.sk_buffs(%struct.sk_buff*, i32 immarg, i32 immarg) #2
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; Function Attrs: nounwind readnone
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declare %struct.anon* @llvm.preserve.array.access.index.p0s_struct.anons.p0a10s_struct.anons([10 x %struct.anon]*, i32 immarg, i32 immarg) #2
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; Function Attrs: nounwind readnone
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declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.anons(%struct.anon*, i32 immarg, i32 immarg) #2
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
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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" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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 = { argmemonly nounwind }
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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 = !{!11, !12, !13}
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!llvm.ident = !{!14}
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!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)
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!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
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!5 = distinct !DIGlobalVariable(name: "bpf_probe_read", scope: !0, file: !1, line: 9, type: !6, isLocal: true, isDefinition: true)
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!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9, !10, !9, !10}
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32 2, !"Debug Info Version", i32 3}
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!13 = !{i32 1, !"wchar_size", i32 4}
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!14 = !{!"clang version 9.0.0 (trunk 360739) (llvm/trunk 360747)"}
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!15 = distinct !DISubprogram(name: "bpf_prog", scope: !1, file: !1, line: 12, type: !16, scopeLine: 12, flags: DIFlagPrototyped, isLocal: false, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !30)
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!16 = !DISubroutineType(types: !17)
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!17 = !{!9, !18}
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
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!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "sk_buff", file: !1, line: 1, size: 672, elements: !20)
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!20 = !{!21, !22}
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!21 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !19, file: !1, line: 2, baseType: !9, size: 32)
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!22 = !DIDerivedType(tag: DW_TAG_member, name: "dev", scope: !19, file: !1, line: 6, baseType: !23, size: 640, offset: 32)
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!23 = !DICompositeType(tag: DW_TAG_array_type, baseType: !24, size: 640, elements: !28)
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!24 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !19, file: !1, line: 3, size: 64, elements: !25)
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!25 = !{!26, !27}
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!26 = !DIDerivedType(tag: DW_TAG_member, name: "dev_id", scope: !24, file: !1, line: 4, baseType: !9, size: 32)
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!27 = !DIDerivedType(tag: DW_TAG_member, name: "others", scope: !24, file: !1, line: 5, baseType: !9, size: 32, offset: 32)
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!28 = !{!29}
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!29 = !DISubrange(count: 10)
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!30 = !{!31, !32}
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!31 = !DILocalVariable(name: "ctx", arg: 1, scope: !15, file: !1, line: 12, type: !18)
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!32 = !DILocalVariable(name: "dev_id", scope: !15, file: !1, line: 13, type: !9)
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!33 = !DILocation(line: 0, scope: !15)
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!34 = !DILocation(line: 13, column: 3, scope: !15)
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!35 = !DILocation(line: 14, column: 40, scope: !15)
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!36 = !DILocation(line: 14, column: 3, scope: !15)
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!37 = !DILocation(line: 15, column: 10, scope: !15)
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!38 = !{!39, !39, i64 0}
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!39 = !{!"int", !40, i64 0}
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!40 = !{!"omnipotent char", !41, i64 0}
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!41 = !{!"Simple C/C++ TBAA"}
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!42 = !DILocation(line: 16, column: 1, scope: !15)
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!43 = !DILocation(line: 15, column: 3, scope: !15)
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