lld/test/MachO/arm64-thunk-visibility.s

   1 # REQUIRES: aarch64
   2
   3 # foo.s and bar.s both contain TU-local symbols (think static function)
   4 # with the same name, and both need a thunk.  This tests that ld64.lld doesn't
   5 # create a duplicate symbol for the two functions.
   6
   7 # Test this both when the TU-local symbol is the branch source or target,
   8 # and for both forward and backwards jumps.
   9
  10 # RUN: rm -rf %t; split-file %s %t
  11 # RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %t/foo.s -o %t/foo.o
  12 # RUN: llvm-mc -filetype=obj -triple=arm64-apple-darwin %t/bar.s -o %t/bar.o
  13 # RUN: %lld -arch arm64 -lSystem -o %t.out %t/foo.o %t/bar.o
  14
  15 #--- foo.s
  16
  17 .subsections_via_symbols
  18
  19 # Note: No .globl, since these are TU-local symbols.
  20 .p2align 2
  21 _early_jumping_local_fn: b _some_late_external
  22 .p2align 2
  23 _early_landing_local_fn: ret
  24
  25 .globl _some_early_external
  26 .p2align 2
  27 _some_early_external: b _late_landing_local_fn
  28
  29 ## 0x8000000 is 128 MiB, one more than the forward branch limit.
  30 ## Distribute that over two functions since our thunk insertion algorithm
  31 ## can't deal with a single function that's 128 MiB.
  32 .global _spacer1, _spacer2
  33 _spacer1:
  34 .space 0x4000000
  35 _spacer2:
  36 .space 0x4000000
  37
  38 # Note: No .globl, since these are TU-local symbols.
  39 .p2align 2
  40 _late_jumping_local_fn: b _some_early_external
  41 .p2align 2
  42 _late_landing_local_fn: ret
  43
  44 .globl _some_late_external
  45 .p2align 2
  46 _some_late_external: b _early_landing_local_fn
  47
  48 #--- bar.s
  49
  50 .subsections_via_symbols
  51
  52 # Note: No .globl, since these are TU-local symbols.
  53 .p2align 2
  54 _early_jumping_local_fn: b _some_other_late_external
  55 .p2align 2
  56 _early_landing_local_fn: ret
  57
  58 .globl _some_other_early_external
  59 .p2align 2
  60 _some_other_early_external: b _late_landing_local_fn
  61
  62 ## 0x8000000 is 128 MiB, one more than the forward branch limit.
  63 ## Distribute that over two functions since our thunk insertion algorithm
  64 ## can't deal with a single function that's 128 MiB.
  65 .global _other_spacer1, _other_spacer1
  66 _spacer1:
  67 .space 0x4000000
  68 _spacer2:
  69 .space 0x4000000
  70
  71 # Note: No .globl, since these are TU-local symbols.
  72 .p2align 2
  73 _late_jumping_local_fn: b _some_other_early_external
  74 .p2align 2
  75 _late_landing_local_fn: ret
  76
  77 .globl _some_other_late_external
  78 .p2align 2
  79 _some_other_late_external: b _early_landing_local_fn
  80
  81 .globl _main
  82 _main:
  83   ret