lld/test/ELF/gc-sections-retain.s

   1 # REQUIRES: x86
   2 ## SHF_GNU_RETAIN is a generic feature defined in the OS specific range. The
   3 ## flag marks a section as a GC root.
   4
   5 # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
   6 # RUN: ld.lld --gc-sections --print-gc-sections %t.o -o %t | count 0
   7 # RUN: llvm-readobj -hS %t | FileCheck %s
   8 # RUN: ld.lld -r -e _start --gc-sections --print-gc-sections %t.o -o %t.ro | count 0
   9 # RUN: llvm-readobj -hS %t.ro | FileCheck %s
  10
  11 # CHECK:      Name: .retain
  12 # CHECK-NEXT: Type: SHT_PROGBITS
  13 # CHECK-NEXT: Flags [
  14 # CHECK-NEXT:   SHF_ALLOC
  15 # CHECK-NEXT:   SHF_GNU_RETAIN
  16 # CHECK-NEXT: ]
  17
  18 # RUN: llvm-mc -filetype=obj -triple=x86_64 --defsym NONALLOC=1 %s -o %t1.o
  19 # RUN: not ld.lld --gc-sections %t1.o -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR
  20
  21 # ERR: error: {{.*}}.o:(.nonalloc): sh_link points to discarded section {{.*}}.o:(.discard)
  22
  23 .global _start
  24 _start:
  25
  26 .section .retain,"aR",@progbits
  27 .quad .foo
  28
  29 .section .foo,"a",@progbits
  30 .quad 0
  31
  32 .ifdef NONALLOC
  33 .section .discard,"a",@progbits
  34
  35 ## With SHF_GNU_RETAIN, .nonalloc is retained while its linked-to section
  36 ## .discard is discarded, so there will be an error.
  37 .section .nonalloc,"oR",@progbits,.discard
  38 .quad .text
  39 .endif