lld/test/MachO/why-live.s

   1 # REQUIRES: x86
   2
   3 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos %s -o %t.o
   4 # RUN: %lld -lSystem -dead_strip -why_live _foo -why_live _undef -U _undef \
   5 # RUN:   -why_live _support -why_live _support_refs_dylib_fun \
   6 # RUN:   -why_live _abs %t.o -o /dev/null 2>&1 | FileCheck %s
   7
   8 ## Due to an implementation detail, LLD is not able to report -why_live info for
   9 ## absolute symbols. (ld64 has the same shortcoming.)
  10 # CHECK-NOT:   _abs
  11 # CHECK:       _foo from {{.*}}why-live.s.tmp.o
  12 # CHECK-NEXT:    _quux from {{.*}}why-live.s.tmp.o
  13 # CHECK-NEXT:  _undef from {{.*}}why-live.s.tmp.o
  14 # CHECK-NEXT:    _main from {{.*}}why-live.s.tmp.o
  15 ## Our handling of live_support sections can be improved... we should print the
  16 ## dylib symbol that keeps _support_refs_dylib_fun alive, instead of printing
  17 ## the live_support symbol's name itself. (ld64 seems to have the same issue.)
  18 # CHECK-NEXT: _support_refs_dylib_fun from {{.*}}why-live.s.tmp.o
  19 # CHECK-NEXT:   _support_refs_dylib_fun from {{.*}}why-live.s.tmp.o
  20 ## Again, this can be improved: we shouldn't be printing _support twice. (ld64
  21 ## seems to have the same issue.)
  22 # CHECK-NEXT:  _support from {{.*}}why-live.s.tmp.o
  23 # CHECK-NEXT:    _support from {{.*}}why-live.s.tmp.o
  24 # CHECK-NEXT:      _foo from {{.*}}why-live.s.tmp.o
  25 # CHECK-EMPTY:
  26
  27 .text
  28 _foo:
  29   retq
  30
  31 _bar:
  32   retq
  33
  34 _baz:
  35   callq _foo
  36   retq
  37
  38 .no_dead_strip _quux
  39 _quux:
  40   callq _foo
  41   retq
  42
  43 .globl _main
  44 _main:
  45   callq _foo
  46   callq _baz
  47   callq _undef
  48   callq ___isnan
  49   retq
  50
  51 .globl _abs
  52 _abs = 0x1000
  53
  54 .section __TEXT,support,regular,live_support
  55 _support:
  56   callq _foo
  57   callq _abs
  58   retq
  59
  60 _support_refs_dylib_fun:
  61   callq ___isnan
  62   retq
  63
  64 .subsections_via_symbols