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
69 lines
3.8 KiB
LLVM
69 lines
3.8 KiB
LLVM
; RUN: llc -march=bpfel -filetype=obj -o - %s | llvm-readelf -x ".BTF" -x ".BTF.ext" | FileCheck -check-prefixes=CHECK,CHECK-EL %s
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; RUN: llc -march=bpfeb -filetype=obj -o - %s | llvm-readelf -x ".BTF" -x ".BTF.ext" | FileCheck -check-prefixes=CHECK,CHECK-EB %s
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; Source code:
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; int f(int a) { return a; }
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; Compilation flag:
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; clang -target bpf -O2 -g -gdwarf-5 -gembed-source -S -emit-llvm t.c
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; Function Attrs: nounwind readnone
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define dso_local i32 @f(i32 returned %a) local_unnamed_addr #0 !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 %a, metadata !12, metadata !DIExpression()), !dbg !13
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ret i32 %a, !dbg !14
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}
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; CHECK: '.BTF'
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; CHECK-EL: 0x00000000 9feb0100 18000000 00000000 30000000
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; CHECK-EL: 0x00000010 30000000 33000000 01000000 00000001
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; CHECK-EL: 0x00000020 04000000 20000001 00000000 0100000d
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; CHECK-EL: 0x00000030 01000000 05000000 01000000 07000000
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; CHECK-EL: 0x00000040 0000000c 02000000 00696e74 00610066
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; CHECK-EB: 0x00000000 eb9f0100 00000018 00000000 00000030
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; CHECK-EB: 0x00000010 00000030 00000033 00000001 01000000
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; CHECK-EB: 0x00000020 00000004 01000020 00000000 0d000001
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; CHECK-EB: 0x00000030 00000001 00000005 00000001 00000007
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; CHECK-EB: 0x00000040 0c000000 00000002 00696e74 00610066
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; CHECK: 0x00000050 002e7465 7874002f 746d702f 742e6300
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; CHECK: 0x00000060 696e7420 6628696e 74206129 207b2072
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; CHECK: 0x00000070 65747572 6e20613b 207d00
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; CHECK: '.BTF.ext'
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; CHECK-EL: 0x00000000 9feb0100 20000000 00000000 14000000
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; CHECK-EL: 0x00000010 14000000 2c000000 40000000 00000000
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; CHECK-EL: 0x00000020 08000000 09000000 01000000 00000000
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; CHECK-EL: 0x00000030 03000000 10000000 09000000 02000000
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; CHECK-EL: 0x00000040 00000000 0f000000 18000000 00040000
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; CHECK-EL: 0x00000050 08000000 0f000000 18000000 10040000
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; CHECK-EB: 0x00000000 eb9f0100 00000020 00000000 00000014
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; CHECK-EB: 0x00000010 00000014 0000002c 00000040 00000000
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; CHECK-EB: 0x00000020 00000008 00000009 00000001 00000000
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; CHECK-EB: 0x00000030 00000003 00000010 00000009 00000002
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; CHECK-EB: 0x00000040 00000000 0000000f 00000018 00000400
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; CHECK-EB: 0x00000050 00000008 0000000f 00000018 00000410
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "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 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "t.c", directory: "/tmp", checksumkind: CSK_MD5, checksum: "1924f0d78deb326ceb76cd8e9f450775", source: "int f(int a) { return a; }\0A")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 5}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}
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!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !10}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 1, type: !10)
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!13 = !DILocation(line: 1, column: 11, scope: !7)
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!14 = !DILocation(line: 1, column: 16, scope: !7)
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