lld/test/ELF/gc-sections-metadata-startstop.s

   1 # REQUIRES: x86
   2 # LINK_ORDER cnamed sections are not kept alive by the __start_* reference.
   3
   4 # RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
   5 # RUN: ld.lld --gc-sections -z start-stop-gc -z nostart-stop-gc %t.o -o %t
   6 # RUN: llvm-objdump --section-headers -t %t | FileCheck  %s
   7
   8 ## With -z start-stop-gc (default), non-SHF_LINK_ORDER C identifier name
   9 ## sections are not retained by __start_/__stop_ references.
  10 # RUN: ld.lld --gc-sections %t.o -o %t
  11 # RUN: llvm-readelf -S -s %t | FileCheck %s --check-prefix=GC
  12 # RUN: ld.lld --gc-sections -z start-stop-gc %t.o -o %t1
  13 # RUN: llvm-readelf -S -s %t1 | FileCheck %s --check-prefix=GC
  14
  15 # CHECK: Sections:
  16 # CHECK-NOT: yy
  17 # CHECK: xx {{.*}} DATA
  18 # CHECK-NOT: yy
  19
  20 # CHECK: SYMBOL TABLE:
  21 # CHECK:   xx    0000000000000000 .protected __start_xx
  22 # CHECK: w *UND* 0000000000000000 __start_yy
  23
  24 # GC:     Section Headers:
  25 # GC-NOT:   xx
  26 # GC-NOT:   yy
  27
  28 # GC:       WEAK DEFAULT UND __start_xx
  29 # GC:       WEAK DEFAULT UND __start_yy
  30
  31 .weak __start_xx
  32 .weak __start_yy
  33
  34 .global _start
  35 _start:
  36 .quad __start_xx
  37 .quad __start_yy
  38
  39 .section xx,"a"
  40 .quad 0
  41
  42 .section .foo,"a"
  43 .quad 0
  44
  45 .section yy,"ao",@progbits,.foo
  46 .quad 0