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3cc43e7b0b
Currently, if an array element type size is 0, the number of
array elements will be set to 0, regardless of what user
specified. This implementation is done in the beginning where
BTF is mostly used to calculate the member offset.
For example,
struct s {};
struct s1 {
int b;
struct s a[2];
};
struct s1 s1;
The BTF will have struct "s1" member "a" with element count 0.
Now BTF types are used for compile-once and run-everywhere
relocations and we need more precise type representation
for type comparison. Andrii reported the issue as there
are differences between original structure and BTF-generated
structure.
This patch made the change to correctly assign "2"
as the number elements of member "a".
Some dead codes related to ElemSize compuation are also removed.
Differential Revision: https://reviews.llvm.org/D67979
llvm-svn: 372785
60 lines
2.6 KiB
LLVM
60 lines
2.6 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 t {};
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; struct t a[10];
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; Compilation flag:
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; clang -target bpf -O2 -g -S -emit-llvm t.c
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%struct.t = type {}
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@a = common dso_local local_unnamed_addr global [10 x %struct.t] zeroinitializer, align 1, !dbg !0
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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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 52
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; CHECK-NEXT: .long 52
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; CHECK-NEXT: .long 23
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; CHECK-NEXT: .long 1 # BTF_KIND_STRUCT(id = 1)
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; CHECK-NEXT: .long 67108864 # 0x4000000
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; CHECK-NEXT: .long 0
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; CHECK-NEXT: .long 0 # BTF_KIND_ARRAY(id = 2)
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; CHECK-NEXT: .long 50331648 # 0x3000000
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; CHECK-NEXT: .long 0
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; CHECK-NEXT: .long 1
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; CHECK-NEXT: .long 3
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; CHECK-NEXT: .long 10
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; CHECK-NEXT: .long 3 # 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 32 # 0x20
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; CHECK-NEXT: .byte 0 # string offset=0
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; CHECK-NEXT: .byte 116 # string offset=1
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; CHECK-NEXT: .byte 0
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; CHECK-NEXT: .ascii "__ARRAY_SIZE_TYPE__" # string offset=3
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; CHECK-NEXT: .byte 0
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
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!4 = !{}
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!5 = !{!0}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, elements: !8)
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!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t", file: !3, line: 1, elements: !4)
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!8 = !{!9}
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!9 = !DISubrange(count: 10)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}
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