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Revert scalar map optimization
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Commit b4a70de ("Keyless maps default to BPF_MAP_TYPE_ARRAY for some
types (#3300)") specialized scalar maps to use array maps under the
hood. The idea was to avoid a hash lookup when there's only a single
key.

Unfortunately, this regressed clear() on scalar maps, as entries cannot
be deleted from an array map. The result was that userspace would print
0 as the value of a scalar map even if it was clear()ed.

Revert to fix the regression. The performance win is not worth the
additional confusion. Note this is only a semantic revert and not a raw
git-revert. The generalization done in the original commit is still
useful and IMO makes the code cleaner.
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@danobi
danobi committed Nov 27, 2024
1 parent 25b02cd commit 68a5169
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Showing 128 changed files with 6,770 additions and 6,370 deletions.
2 changes: 0 additions & 2 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -63,8 +63,6 @@ and this project adheres to
- [#3203](https://github.com/bpftrace/bpftrace/pull/3203)
- Remove length limitations for the `buf` builtin function
- [#3249](https://github.com/bpftrace/bpftrace/pull/3249)
- Faster map access for keyless maps by using BPF_MAP_TYPE_ARRAY
- [#3300](https://github.com/bpftrace/bpftrace/pull/3300)
- Change `delete` API to accept a map and key as separate args
- [#3472](https://github.com/bpftrace/bpftrace/pull/3472)
- Symbolize enums when used in maps
Expand Down
10 changes: 2 additions & 8 deletions man/adoc/bpftrace.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -4145,9 +4145,9 @@ Therefore, when you need precise event statistics, it is recommended to use sync
=== Map Printing

By default when a bpftrace program exits it will print all maps to stdout.
If you don't want this, you can either override the `print_maps_on_exit` configuration option or you can specify an `END` probe and `clear` the maps you don't want printed (this second method doesn't work for scalar maps).
If you don't want this, you can either override the `print_maps_on_exit` configuration option or you can specify an `END` probe and `clear` the maps you don't want printed.

For example, this script:
For example, these two scripts are equivalent and will print nothing on exit:
```
config = {
print_maps_on_exit=0
Expand All @@ -4159,7 +4159,6 @@ BEGIN {
}
```

would print nothing on exit, while this script:
```
BEGIN {
@a = 1;
Expand All @@ -4172,11 +4171,6 @@ END {
}
```

will print this on exit:
```
@a: 0
```

=== Systemd support

To run bpftrace in the background using systemd::
Expand Down
4 changes: 1 addition & 3 deletions src/ast/passes/codegen_llvm.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3798,8 +3798,6 @@ libbpf::bpf_map_type CodegenLLVM::get_map_type(const SizedType &val_type,
} else if (bpftrace_.feature_->has_map_percpu_hash() &&
val_type.NeedsPercpuMap()) {
return libbpf::BPF_MAP_TYPE_PERCPU_HASH;
} else if (!val_type.NeedsPercpuMap() && key_type.IsNoneTy()) {
return libbpf::BPF_MAP_TYPE_ARRAY;
} else {
return libbpf::BPF_MAP_TYPE_HASH;
}
Expand All @@ -3814,7 +3812,7 @@ bool CodegenLLVM::is_array_map(const SizedType &val_type,
}

// Check if we can special-case the map to have a single element. This is done
// for keyless maps (e.g. @x = 1 or @++) of BPF_MAP_TYPE_(PERCPU_)ARRAY type.
// for keyless maps BPF_MAP_TYPE_(PERCPU_)ARRAY type.
bool CodegenLLVM::map_has_single_elem(const SizedType &val_type,
const SizedType &key_type)
{
Expand Down
100 changes: 52 additions & 48 deletions tests/codegen/llvm/basic_while_loop.ll
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,13 +9,13 @@ target triple = "bpf-pc-linux"

@LICENSE = global [4 x i8] c"GPL\00", section "license"
@AT_ = dso_local global %"struct map_t" zeroinitializer, section ".maps", !dbg !0
@ringbuf = dso_local global %"struct map_t.0" zeroinitializer, section ".maps", !dbg !22
@event_loss_counter = dso_local global %"struct map_t.1" zeroinitializer, section ".maps", !dbg !36
@ringbuf = dso_local global %"struct map_t.0" zeroinitializer, section ".maps", !dbg !16
@event_loss_counter = dso_local global %"struct map_t.1" zeroinitializer, section ".maps", !dbg !30

; Function Attrs: nounwind
declare i64 @llvm.bpf.pseudo(i64 %0, i64 %1) #0

define i64 @interval_s_1_1(ptr %0) section "s_interval_s_1_1" !dbg !41 {
define i64 @interval_s_1_1(ptr %0) section "s_interval_s_1_1" !dbg !45 {
entry:
%"@_val" = alloca i64, align 8
%"@_key" = alloca i64, align 8
Expand All @@ -29,7 +29,7 @@ while_cond: ; preds = %while_body, %entry
%1 = load i64, ptr %"$a", align 8
%2 = icmp sle i64 %1, 150
%true_cond = icmp ne i1 %2, false
br i1 %true_cond, label %while_body, label %while_end, !llvm.loop !48
br i1 %true_cond, label %while_body, label %while_end, !llvm.loop !52

while_body: ; preds = %while_cond
%3 = load i64, ptr %"$a", align 8
Expand Down Expand Up @@ -57,56 +57,60 @@ declare void @llvm.lifetime.end.p0(i64 immarg %0, ptr nocapture %1) #1
attributes #0 = { nounwind }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }

!llvm.dbg.cu = !{!38}
!llvm.module.flags = !{!40}
!llvm.dbg.cu = !{!42}
!llvm.module.flags = !{!44}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "AT_", linkageName: "global", scope: !2, file: !2, type: !3, isLocal: false, isDefinition: true)
!2 = !DIFile(filename: "bpftrace.bpf.o", directory: ".")
!3 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 256, elements: !4)
!4 = !{!5, !11, !16, !19}
!4 = !{!5, !11, !12, !15}
!5 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !6, size: 64)
!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 64, elements: !9)
!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 32, elements: !9)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !{!10}
!10 = !DISubrange(count: 2, lowerBound: 0)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !12, size: 64, offset: 64)
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
!13 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 32, elements: !14)
!14 = !{!15}
!15 = !DISubrange(count: 1, lowerBound: 0)
!16 = !DIDerivedType(tag: DW_TAG_member, name: "key", scope: !2, file: !2, baseType: !17, size: 64, offset: 128)
!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64)
!18 = !DIBasicType(name: "int32", size: 32, encoding: DW_ATE_signed)
!19 = !DIDerivedType(tag: DW_TAG_member, name: "value", scope: !2, file: !2, baseType: !20, size: 64, offset: 192)
!20 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !21, size: 64)
!21 = !DIBasicType(name: "int64", size: 64, encoding: DW_ATE_signed)
!22 = !DIGlobalVariableExpression(var: !23, expr: !DIExpression())
!23 = distinct !DIGlobalVariable(name: "ringbuf", linkageName: "global", scope: !2, file: !2, type: !24, isLocal: false, isDefinition: true)
!24 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 128, elements: !25)
!25 = !{!26, !31}
!26 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !27, size: 64)
!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !28, size: 64)
!28 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 864, elements: !29)
!29 = !{!30}
!30 = !DISubrange(count: 27, lowerBound: 0)
!31 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !32, size: 64, offset: 64)
!32 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !33, size: 64)
!33 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 8388608, elements: !34)
!34 = !{!35}
!35 = !DISubrange(count: 262144, lowerBound: 0)
!36 = !DIGlobalVariableExpression(var: !37, expr: !DIExpression())
!37 = distinct !DIGlobalVariable(name: "event_loss_counter", linkageName: "global", scope: !2, file: !2, type: !3, isLocal: false, isDefinition: true)
!38 = distinct !DICompileUnit(language: DW_LANG_C, file: !2, producer: "bpftrace", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, globals: !39)
!39 = !{!0, !22, !36}
!40 = !{i32 2, !"Debug Info Version", i32 3}
!41 = distinct !DISubprogram(name: "interval_s_1_1", linkageName: "interval_s_1_1", scope: !2, file: !2, type: !42, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !38, retainedNodes: !46)
!42 = !DISubroutineType(types: !43)
!43 = !{!21, !44}
!44 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !45, size: 64)
!45 = !DIBasicType(name: "int8", size: 8, encoding: DW_ATE_signed)
!46 = !{!47}
!47 = !DILocalVariable(name: "ctx", arg: 1, scope: !41, file: !2, type: !44)
!48 = distinct !{!48, !49}
!49 = !{!"llvm.loop.unroll.disable"}
!10 = !DISubrange(count: 1, lowerBound: 0)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !6, size: 64, offset: 64)
!12 = !DIDerivedType(tag: DW_TAG_member, name: "key", scope: !2, file: !2, baseType: !13, size: 64, offset: 128)
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!14 = !DIBasicType(name: "int64", size: 64, encoding: DW_ATE_signed)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "value", scope: !2, file: !2, baseType: !13, size: 64, offset: 192)
!16 = !DIGlobalVariableExpression(var: !17, expr: !DIExpression())
!17 = distinct !DIGlobalVariable(name: "ringbuf", linkageName: "global", scope: !2, file: !2, type: !18, isLocal: false, isDefinition: true)
!18 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 128, elements: !19)
!19 = !{!20, !25}
!20 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !21, size: 64)
!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !22, size: 64)
!22 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 864, elements: !23)
!23 = !{!24}
!24 = !DISubrange(count: 27, lowerBound: 0)
!25 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !26, size: 64, offset: 64)
!26 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !27, size: 64)
!27 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 8388608, elements: !28)
!28 = !{!29}
!29 = !DISubrange(count: 262144, lowerBound: 0)
!30 = !DIGlobalVariableExpression(var: !31, expr: !DIExpression())
!31 = distinct !DIGlobalVariable(name: "event_loss_counter", linkageName: "global", scope: !2, file: !2, type: !32, isLocal: false, isDefinition: true)
!32 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 256, elements: !33)
!33 = !{!34, !11, !39, !15}
!34 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !35, size: 64)
!35 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !36, size: 64)
!36 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 64, elements: !37)
!37 = !{!38}
!38 = !DISubrange(count: 2, lowerBound: 0)
!39 = !DIDerivedType(tag: DW_TAG_member, name: "key", scope: !2, file: !2, baseType: !40, size: 64, offset: 128)
!40 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !41, size: 64)
!41 = !DIBasicType(name: "int32", size: 32, encoding: DW_ATE_signed)
!42 = distinct !DICompileUnit(language: DW_LANG_C, file: !2, producer: "bpftrace", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, globals: !43)
!43 = !{!0, !16, !30}
!44 = !{i32 2, !"Debug Info Version", i32 3}
!45 = distinct !DISubprogram(name: "interval_s_1_1", linkageName: "interval_s_1_1", scope: !2, file: !2, type: !46, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !42, retainedNodes: !50)
!46 = !DISubroutineType(types: !47)
!47 = !{!14, !48}
!48 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !49, size: 64)
!49 = !DIBasicType(name: "int8", size: 8, encoding: DW_ATE_signed)
!50 = !{!51}
!51 = !DILocalVariable(name: "ctx", arg: 1, scope: !45, file: !2, type: !48)
!52 = distinct !{!52, !53}
!53 = !{!"llvm.loop.unroll.disable"}
94 changes: 49 additions & 45 deletions tests/codegen/llvm/bitshift_left.ll
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,13 +9,13 @@ target triple = "bpf-pc-linux"

@LICENSE = global [4 x i8] c"GPL\00", section "license"
@AT_x = dso_local global %"struct map_t" zeroinitializer, section ".maps", !dbg !0
@ringbuf = dso_local global %"struct map_t.0" zeroinitializer, section ".maps", !dbg !22
@event_loss_counter = dso_local global %"struct map_t.1" zeroinitializer, section ".maps", !dbg !36
@ringbuf = dso_local global %"struct map_t.0" zeroinitializer, section ".maps", !dbg !16
@event_loss_counter = dso_local global %"struct map_t.1" zeroinitializer, section ".maps", !dbg !30

; Function Attrs: nounwind
declare i64 @llvm.bpf.pseudo(i64 %0, i64 %1) #0

define i64 @kprobe_f_1(ptr %0) section "s_kprobe_f_1" !dbg !41 {
define i64 @kprobe_f_1(ptr %0) section "s_kprobe_f_1" !dbg !45 {
entry:
%"@x_val" = alloca i64, align 8
%"@x_key" = alloca i64, align 8
Expand All @@ -38,54 +38,58 @@ declare void @llvm.lifetime.end.p0(i64 immarg %0, ptr nocapture %1) #1
attributes #0 = { nounwind }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }

!llvm.dbg.cu = !{!38}
!llvm.module.flags = !{!40}
!llvm.dbg.cu = !{!42}
!llvm.module.flags = !{!44}

!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "AT_x", linkageName: "global", scope: !2, file: !2, type: !3, isLocal: false, isDefinition: true)
!2 = !DIFile(filename: "bpftrace.bpf.o", directory: ".")
!3 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 256, elements: !4)
!4 = !{!5, !11, !16, !19}
!4 = !{!5, !11, !12, !15}
!5 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !6, size: 64)
!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 64, elements: !9)
!7 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 32, elements: !9)
!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!9 = !{!10}
!10 = !DISubrange(count: 2, lowerBound: 0)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !12, size: 64, offset: 64)
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 64)
!13 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 32, elements: !14)
!14 = !{!15}
!15 = !DISubrange(count: 1, lowerBound: 0)
!16 = !DIDerivedType(tag: DW_TAG_member, name: "key", scope: !2, file: !2, baseType: !17, size: 64, offset: 128)
!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64)
!18 = !DIBasicType(name: "int32", size: 32, encoding: DW_ATE_signed)
!19 = !DIDerivedType(tag: DW_TAG_member, name: "value", scope: !2, file: !2, baseType: !20, size: 64, offset: 192)
!20 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !21, size: 64)
!21 = !DIBasicType(name: "int64", size: 64, encoding: DW_ATE_signed)
!22 = !DIGlobalVariableExpression(var: !23, expr: !DIExpression())
!23 = distinct !DIGlobalVariable(name: "ringbuf", linkageName: "global", scope: !2, file: !2, type: !24, isLocal: false, isDefinition: true)
!24 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 128, elements: !25)
!25 = !{!26, !31}
!26 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !27, size: 64)
!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !28, size: 64)
!28 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 864, elements: !29)
!29 = !{!30}
!30 = !DISubrange(count: 27, lowerBound: 0)
!31 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !32, size: 64, offset: 64)
!32 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !33, size: 64)
!33 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 8388608, elements: !34)
!34 = !{!35}
!35 = !DISubrange(count: 262144, lowerBound: 0)
!36 = !DIGlobalVariableExpression(var: !37, expr: !DIExpression())
!37 = distinct !DIGlobalVariable(name: "event_loss_counter", linkageName: "global", scope: !2, file: !2, type: !3, isLocal: false, isDefinition: true)
!38 = distinct !DICompileUnit(language: DW_LANG_C, file: !2, producer: "bpftrace", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, globals: !39)
!39 = !{!0, !22, !36}
!40 = !{i32 2, !"Debug Info Version", i32 3}
!41 = distinct !DISubprogram(name: "kprobe_f_1", linkageName: "kprobe_f_1", scope: !2, file: !2, type: !42, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !38, retainedNodes: !46)
!42 = !DISubroutineType(types: !43)
!43 = !{!21, !44}
!44 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !45, size: 64)
!45 = !DIBasicType(name: "int8", size: 8, encoding: DW_ATE_signed)
!46 = !{!47}
!47 = !DILocalVariable(name: "ctx", arg: 1, scope: !41, file: !2, type: !44)
!10 = !DISubrange(count: 1, lowerBound: 0)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !6, size: 64, offset: 64)
!12 = !DIDerivedType(tag: DW_TAG_member, name: "key", scope: !2, file: !2, baseType: !13, size: 64, offset: 128)
!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !14, size: 64)
!14 = !DIBasicType(name: "int64", size: 64, encoding: DW_ATE_signed)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "value", scope: !2, file: !2, baseType: !13, size: 64, offset: 192)
!16 = !DIGlobalVariableExpression(var: !17, expr: !DIExpression())
!17 = distinct !DIGlobalVariable(name: "ringbuf", linkageName: "global", scope: !2, file: !2, type: !18, isLocal: false, isDefinition: true)
!18 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 128, elements: !19)
!19 = !{!20, !25}
!20 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !21, size: 64)
!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !22, size: 64)
!22 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 864, elements: !23)
!23 = !{!24}
!24 = !DISubrange(count: 27, lowerBound: 0)
!25 = !DIDerivedType(tag: DW_TAG_member, name: "max_entries", scope: !2, file: !2, baseType: !26, size: 64, offset: 64)
!26 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !27, size: 64)
!27 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 8388608, elements: !28)
!28 = !{!29}
!29 = !DISubrange(count: 262144, lowerBound: 0)
!30 = !DIGlobalVariableExpression(var: !31, expr: !DIExpression())
!31 = distinct !DIGlobalVariable(name: "event_loss_counter", linkageName: "global", scope: !2, file: !2, type: !32, isLocal: false, isDefinition: true)
!32 = !DICompositeType(tag: DW_TAG_structure_type, scope: !2, file: !2, size: 256, elements: !33)
!33 = !{!34, !11, !39, !15}
!34 = !DIDerivedType(tag: DW_TAG_member, name: "type", scope: !2, file: !2, baseType: !35, size: 64)
!35 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !36, size: 64)
!36 = !DICompositeType(tag: DW_TAG_array_type, baseType: !8, size: 64, elements: !37)
!37 = !{!38}
!38 = !DISubrange(count: 2, lowerBound: 0)
!39 = !DIDerivedType(tag: DW_TAG_member, name: "key", scope: !2, file: !2, baseType: !40, size: 64, offset: 128)
!40 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !41, size: 64)
!41 = !DIBasicType(name: "int32", size: 32, encoding: DW_ATE_signed)
!42 = distinct !DICompileUnit(language: DW_LANG_C, file: !2, producer: "bpftrace", isOptimized: false, runtimeVersion: 0, emissionKind: LineTablesOnly, globals: !43)
!43 = !{!0, !16, !30}
!44 = !{i32 2, !"Debug Info Version", i32 3}
!45 = distinct !DISubprogram(name: "kprobe_f_1", linkageName: "kprobe_f_1", scope: !2, file: !2, type: !46, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !42, retainedNodes: !50)
!46 = !DISubroutineType(types: !47)
!47 = !{!14, !48}
!48 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !49, size: 64)
!49 = !DIBasicType(name: "int8", size: 8, encoding: DW_ATE_signed)
!50 = !{!51}
!51 = !DILocalVariable(name: "ctx", arg: 1, scope: !45, file: !2, type: !48)
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