llvm/test/CodeGen/BPF/BTF/extern-func-ptr.ll

   1 ; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
   2 ; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
   3 ;
   4 ; Source code:
   5 ;   extern int do_work(int) __attribute__((section(".callback_fn")));
   6 ;   long bpf_helper(ptr callback_fn);
   7 ;   long prog() {
   8 ;       return bpf_helper(&do_work);
   9 ;   }
  10 ; Compilation flag:
  11 ;   clang -target bpf -O2 -g -S -emit-llvm test.c
  12
  13 ; Function Attrs: nounwind
  14 define dso_local i64 @prog() local_unnamed_addr #0 !dbg !7 {
  15 entry:
  16   %call = tail call i64 @bpf_helper(ptr @do_work) #2, !dbg !11
  17   ret i64 %call, !dbg !12
  18 }
  19
  20 ; CHECK:             .long   0                               # BTF_KIND_FUNC_PROTO(id = 4)
  21 ; CHECK-NEXT:        .long   218103809                       # 0xd000001
  22 ; CHECK-NEXT:        .long   5
  23 ; CHECK-NEXT:        .long   0
  24 ; CHECK-NEXT:        .long   5
  25 ; CHECK-NEXT:        .long   51                              # BTF_KIND_INT(id = 5)
  26 ; CHECK-NEXT:        .long   16777216                        # 0x1000000
  27 ; CHECK-NEXT:        .long   4
  28 ; CHECK-NEXT:        .long   16777248                        # 0x1000020
  29 ; CHECK-NEXT:        .long   55                              # BTF_KIND_FUNC(id = 6)
  30 ; CHECK-NEXT:        .long   201326594                       # 0xc000002
  31 ; CHECK-NEXT:        .long   4
  32
  33 ; CHECK:             .long   74                              # BTF_KIND_DATASEC(id = 10)
  34 ; CHECK-NEXT:        .long   251658241                       # 0xf000001
  35 ; CHECK-NEXT:        .long   0
  36 ; CHECK-NEXT:        .long   6
  37 ; CHECK-NEXT:        .long   do_work
  38 ; CHECK-NEXT:        .long   0
  39
  40 ; CHECK:             .ascii  "int"                           # string offset=51
  41 ; CHECK:             .ascii  "do_work"                       # string offset=55
  42 ; CHECK:             .ascii  ".callback_fn"                  # string offset=74
  43
  44 declare !dbg !13 dso_local i64 @bpf_helper(ptr) local_unnamed_addr #1
  45
  46 declare !dbg !17 dso_local i32 @do_work(i32) #1 section ".callback_fn"
  47
  48 attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
  49 attributes #1 = { "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
  50 attributes #2 = { nounwind }
  51
  52 !llvm.dbg.cu = !{!0}
  53 !llvm.module.flags = !{!3, !4, !5}
  54 !llvm.ident = !{!6}
  55
  56 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 13.0.0 (https://github.com/llvm/llvm-project.git aa382ed8a38d5efa118e1b2617544f5c253658a9)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
  57 !1 = !DIFile(filename: "test.c", directory: "/tmp/home/yhs/btf/core")
  58 !2 = !{}
  59 !3 = !{i32 7, !"Dwarf Version", i32 4}
  60 !4 = !{i32 2, !"Debug Info Version", i32 3}
  61 !5 = !{i32 1, !"wchar_size", i32 4}
  62 !6 = !{!"clang version 13.0.0 (https://github.com/llvm/llvm-project.git aa382ed8a38d5efa118e1b2617544f5c253658a9)"}
  63 !7 = distinct !DISubprogram(name: "prog", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !2)
  64 !8 = !DISubroutineType(types: !9)
  65 !9 = !{!10}
  66 !10 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
  67 !11 = !DILocation(line: 4, column: 12, scope: !7)
  68 !12 = !DILocation(line: 4, column: 5, scope: !7)
  69 !13 = !DISubprogram(name: "bpf_helper", scope: !1, file: !1, line: 2, type: !14, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
  70 !14 = !DISubroutineType(types: !15)
  71 !15 = !{!10, !16}
  72 !16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
  73 !17 = !DISubprogram(name: "do_work", scope: !1, file: !1, line: 1, type: !18, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2)
  74 !18 = !DISubroutineType(types: !19)
  75 !19 = !{!20, !20}
  76 !20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)