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clang-p2996/llvm/test/CodeGen/BPF/CORE/offset-reloc-cast-struct-2.ll
Yonghong Song 37d24a696b [BPF] Handling type conversions correctly for CO-RE 
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
2019-08-02 23:16:44 +00:00

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; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
; Source code:
; struct v1 { int a; int b; };
; typedef struct v1 __v1;
; struct v2 { int c; int d; };
; typedef struct v2 __v2;
; struct v3 { char c; volatile const __v2 d; };
; typedef struct v3 __v3;
; #define _(x) (__builtin_preserve_access_index(x))
; #define cast_to_v1(x) ((__v1 *)(x))
; int get_value(const int *arg);
; int test(__v3 *arg) {
; return get_value(_(&cast_to_v1(&arg->d)->b));
; }
; Compilation flag:
; clang -target bpf -O2 -g -S -emit-llvm test.c
%struct.v3 = type { i8, %struct.v2 }
%struct.v2 = type { i32, i32 }
%struct.v1 = type { i32, i32 }
; Function Attrs: nounwind
define dso_local i32 @test(%struct.v3* %arg) local_unnamed_addr #0 !dbg !15 {
entry:
call void @llvm.dbg.value(metadata %struct.v3* %arg, metadata !33, metadata !DIExpression()), !dbg !34
%0 = tail call %struct.v2* @llvm.preserve.struct.access.index.p0s_struct.v2s.p0s_struct.v3s(%struct.v3* %arg, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !20
%1 = bitcast %struct.v2* %0 to %struct.v1*, !dbg !35
%2 = tail call i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.v1s(%struct.v1* %1, i32 1, i32 1), !dbg !35, !llvm.preserve.access.index !6
%call = tail call i32 @get_value(i32* %2) #4, !dbg !36
ret i32 %call, !dbg !37
}
; CHECK: r2 = 4
; CHECK: r1 += r2
; CHECK: r2 = 4
; CHECK: r1 += r2
; CHECK: call get_value
; CHECK: .long 6 # BTF_KIND_STRUCT(id = [[TID1:[0-9]+]])
; CHECK: .long 91 # BTF_KIND_STRUCT(id = [[TID2:[0-9]+]])
; CHECK: .ascii "v3" # string offset=6
; CHECK: .ascii ".text" # string offset=39
; CHECK: .ascii "0:1" # string offset=45
; CHECK: .ascii "v1" # string offset=91
; CHECK: .long 12 # OffsetReloc
; CHECK-NEXT: .long 39 # Offset reloc section string offset=39
; CHECK-NEXT: .long 2
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long [[TID1]]
; CHECK-NEXT: .long 45
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
; CHECK-NEXT: .long [[TID2]]
; CHECK-NEXT: .long 45
declare dso_local i32 @get_value(i32*) local_unnamed_addr #1
; Function Attrs: nounwind readnone
declare %struct.v2* @llvm.preserve.struct.access.index.p0s_struct.v2s.p0s_struct.v3s(%struct.v3*, i32, i32) #2
; Function Attrs: nounwind readnone
declare i32* @llvm.preserve.struct.access.index.p0i32.p0s_struct.v1s(%struct.v1*, i32, i32) #2
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.value(metadata, metadata, metadata) #3
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 = { "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 #2 = { nounwind readnone }
attributes #3 = { nounwind readnone speculatable willreturn }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!11, !12, !13}
!llvm.ident = !{!14}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None)
!1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/work/tests/llvm/cast")
!2 = !{}
!3 = !{!4}
!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v1", file: !1, line: 2, baseType: !6)
!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v1", file: !1, line: 1, size: 64, elements: !7)
!7 = !{!8, !10}
!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !1, line: 1, baseType: !9, size: 32)
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !1, line: 1, baseType: !9, size: 32, offset: 32)
!11 = !{i32 2, !"Dwarf Version", i32 4}
!12 = !{i32 2, !"Debug Info Version", i32 3}
!13 = !{i32 1, !"wchar_size", i32 4}
!14 = !{!"clang version 10.0.0 (trunk 367256) (llvm/trunk 367266)"}
!15 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 10, type: !16, scopeLine: 10, flags: DIFlagPrototyped, isDefinition: true, isOptimized: true, unit: !0, retainedNodes: !32)
!16 = !DISubroutineType(types: !17)
!17 = !{!9, !18}
!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
!19 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v3", file: !1, line: 6, baseType: !20)
!20 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v3", file: !1, line: 5, size: 96, elements: !21)
!21 = !{!22, !24}
!22 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !20, file: !1, line: 5, baseType: !23, size: 8)
!23 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!24 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !20, file: !1, line: 5, baseType: !25, size: 64, offset: 32)
!25 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !26)
!26 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !27)
!27 = !DIDerivedType(tag: DW_TAG_typedef, name: "__v2", file: !1, line: 4, baseType: !28)
!28 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v2", file: !1, line: 3, size: 64, elements: !29)
!29 = !{!30, !31}
!30 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !28, file: !1, line: 3, baseType: !9, size: 32)
!31 = !DIDerivedType(tag: DW_TAG_member, name: "d", scope: !28, file: !1, line: 3, baseType: !9, size: 32, offset: 32)
!32 = !{!33}
!33 = !DILocalVariable(name: "arg", arg: 1, scope: !15, file: !1, line: 10, type: !18)
!34 = !DILocation(line: 0, scope: !15)
!35 = !DILocation(line: 11, column: 20, scope: !15)
!36 = !DILocation(line: 11, column: 10, scope: !15)
!37 = !DILocation(line: 11, column: 3, scope: !15)
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