llvm/test/ExecutionEngine/JITLink/x86-64/MachO_cstring_section_splitting.s

   1 # REQUIRES: asserts
   2 # RUN: llvm-mc -triple=x86_64-apple-macosx10.9 -filetype=obj -o %t %s
   3 # RUN: llvm-jitlink -num-threads=0 -debug-only=jitlink -noexec \
   4 # RUN:              -entry hook %t 2>&1 \
   5 # RUN:              | FileCheck %s
   6 #
   7 # Verify that we split C string literals on null-terminators, rather than on
   8 # symbol boundaries. We expect four dead-stripped symbols: l_str.0, l_str.2,
   9 # L_str.3, l_str.4, and the auto-generated symbol for the start of the "defghi"
  10 # string. We also verify that there are only two dead-stripped blocks, since
  11 # l_str.3 should not have split the block started at "def"... (since this is a
  12 # C string section we should be splitting on null characters instead of
  13 # symbols).
  14 #
  15 # CHECK:      Dead-stripping defined symbols:
  16 # CHECK-NEXT: linkage: strong, scope: local, dead
  17 # CHECK-NEXT: linkage: strong, scope: local, dead
  18 # CHECK-NEXT: linkage: strong, scope: local, dead
  19 # CHECK-NEXT: linkage: strong, scope: local, dead
  20 # CHECK-NEXT: Dead-stripping blocks:
  21 # CHECK-NEXT: content, align = 1, align-ofs = 0, section = __TEXT,__cstring
  22 # CHECK-NEXT: content, align = 1, align-ofs = 0, section = __TEXT,__cstring
  23 # CHECK-NEXT: Removing unused external symbols
  24
  25         .section        __DATA,__data
  26         .globl  hook
  27         .p2align        2
  28 hook:
  29         .quad   l_str.1
  30
  31         .section        __TEXT,__cstring,cstring_literals
  32 l_str.0:
  33 l_str.1:
  34         .asciz  "abc"
  35 l_str.2:
  36         .asciz  ""
  37 # anonymous start for "defghi", split in the middle by l_str.3. We expect this
  38 # to be dead-stripped as a single block.
  39         .byte   'd'
  40         .byte   'e'
  41         .byte   'f'
  42 l_str.3:
  43         .asciz  "ghi"
  44
  45 .subsections_via_symbols