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fefb19fcc0
With newly added debuginfo type
metadata for preserve_array_access_index() intrinsic,
this patch did the following two things:
(1). checking validity before adding a new access index
to the access chain.
(2). calculating access byte offset in IR phase
BPFAbstractMemberAccess instead of when BTF is emitted.
For (1), the metadata provided by all preserve_*_access_index()
intrinsics are used to check whether the to-be-added type
is a proper struct/union member or array element.
For (2), with all available metadata, calculating access byte
offset becomes easier in BPFAbstractMemberAccess IR phase.
This enables us to remove the unnecessary complexity in
BTFDebug.cpp.
New tests are added for
. user explicit casting to array/structure/union
. global variable (or its dereference) as the source of base
. multi demensional arrays
. array access given a base pointer
. cases where we won't generate relocation if we cannot find
type name.
Differential Revision: https://reviews.llvm.org/D65618
llvm-svn: 367735
80 lines
4.3 KiB
LLVM
80 lines
4.3 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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; typedef struct v3 { int a; int b; } __v3;
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; #define _(x) (__builtin_preserve_access_index(x))
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; int get_value(const int *arg);
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; __v3 g __attribute__((section("stats")));
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; int test() {
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; return get_value(_(&g.b));
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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.v3 = type { i32, i32 }
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@g = dso_local global %struct.v3 zeroinitializer, section "stats", align 4, !dbg !0
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; Function Attrs: nounwind
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define dso_local i32 @test() local_unnamed_addr #0 !dbg !16 {
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entry:
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%0 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.v3s(%struct.v3* nonnull @g, i32 1, i32 1), !dbg !19, !llvm.preserve.access.index !7
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%call = tail call i32 @get_value(i32* %0) #3, !dbg !20
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ret i32 %call, !dbg !21
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}
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; CHECK: r2 = 4
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; CHECK: r1 = g ll
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; CHECK: r1 += r2
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; CHECK: call get_value
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; CHECK: .long 16 # BTF_KIND_STRUCT(id = [[TID1:[0-9]+]])
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; CHECK: .ascii ".text" # string offset=10
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; CHECK: .ascii "v3" # string offset=16
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; CHECK: .ascii "0:1" # string offset=23
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; CHECK: .long 12 # OffsetReloc
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; CHECK-NEXT: .long 10 # Offset reloc section string offset=10
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long [[TID1]]
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; CHECK-NEXT: .long 23
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declare dso_local i32 @get_value(i32*) 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.v3s(%struct.v3*, i32, i32) #2
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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" }
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attributes #1 = { "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" }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!12, !13, !14}
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!llvm.ident = !{!15}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "g", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !3, line: 1, baseType: !7)
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!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v3", file: !3, line: 1, size: 64, elements: !8)
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!8 = !{!9, !11}
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!9 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !7, file: !3, line: 1, baseType: !10, size: 32)
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !7, file: !3, line: 1, baseType: !10, size: 32, offset: 32)
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!12 = !{i32 2, !"Dwarf Version", i32 4}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{i32 1, !"wchar_size", i32 4}
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!15 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"}
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!16 = distinct !DISubprogram(name: "test", scope: !3, file: !3, line: 5, type: !17, scopeLine: 5, isDefinition: true, isOptimized: true, unit: !2, retainedNodes: !4)
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!17 = !DISubroutineType(types: !18)
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!18 = !{!10}
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!19 = !DILocation(line: 6, column: 20, scope: !16)
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!20 = !DILocation(line: 6, column: 10, scope: !16)
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!21 = !DILocation(line: 6, column: 3, scope: !16)
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