lld/test/MachO/mh-header-link.s

   1 # REQUIRES: x86
   2
   3 ## This tests that we can link against these synthetic symbols even
   4 ## if they are not in the symbol table.
   5
   6 # RUN: rm -rf %t; split-file %s %t
   7
   8 ## Test that in a dylib, we can link against __mh_dylib_header
   9 ## (but not in other types of files)
  10
  11 # RUN: llvm-mc %t/dylib.s -triple=x86_64-apple-macos10.15 -filetype=obj -o %t/dylib.o
  12 # RUN: %lld -dylib -dead_strip %t/dylib.o -o %t/dylib.out
  13 # RUN: llvm-objdump -m --syms %t/dylib.out | FileCheck %s --check-prefix DYLIB
  14
  15 # RUN: not %lld -o /dev/null %t/dylib.o 2>&1 | FileCheck %s --check-prefix ERR-DYLIB
  16
  17 # DYLIB:      SYMBOL TABLE:
  18 # DYLIB-NEXT: {{[0-9a-f]+}} g     F __TEXT,__text _main
  19 # DYLIB-NEXT-EMPTY:
  20 # ERR-DYLIB: error: undefined symbol: __mh_dylib_header
  21
  22 ## Test that in an executable, we can link against __mh_execute_header
  23 # RUN: llvm-mc %t/main.s -triple=x86_64-apple-macos10.15 -filetype=obj -o %t/exec.o
  24 # RUN: %lld -dead_strip -lSystem %t/exec.o -o %t/exec.out
  25
  26 ## But it would be an error trying to reference __mh_execute_header in a dylib
  27 # RUN: not %lld -o /dev/null -dylib %t/exec.o 2>&1 | FileCheck %s --check-prefix ERR-EXEC
  28
  29 # ERR-EXEC: error: undefined symbol: __mh_execute_header
  30
  31 #--- main.s
  32 .text
  33 .globl _main
  34 _main:
  35  mov __mh_execute_header@GOTPCREL(%rip), %rax
  36  ret
  37 .subsections_via_symbols
  38
  39 #--- dylib.s
  40 .text
  41 .globl _main
  42 _main:
  43  mov __mh_dylib_header@GOTPCREL(%rip), %rax
  44  ret
  45 .subsections_via_symbols