lld/test/ELF/gc-sections-with-provide.s

   1 # REQUIRES: x86
   2
   3 # This test verifies that garbage-collection is correctly garbage collecting
   4 # unused sections when the symbol of the unused section is only referred by
   5 # an unused PROVIDE symbol.
   6
   7 # RUN: rm -rf %t && split-file %s %t && cd %t
   8 # RUN: llvm-mc -filetype=obj -triple=x86_64 a.s -o a.o
   9 # RUN: ld.lld -o a_nogc a.o -T script.t
  10 # RUN: llvm-nm a_nogc | FileCheck -check-prefix=NOGC %s
  11 # RUN: ld.lld -o a_gc a.o --gc-sections --print-gc-sections -T script.t | FileCheck --check-prefix=GC_LINK %s
  12 # RUN: llvm-nm a_gc | FileCheck -check-prefix=GC %s
  13
  14 NOGC-NOT: another_unused
  15 NOGC: another_used
  16 NOGC: bar
  17 NOGC: baz
  18 NOGC: baz_ref
  19 NOGC: foo
  20 NOGC-NOT: unused
  21 NOGC: used
  22
  23 GC_LINK: removing unused section a.o:(.text.bar)
  24
  25 GC-NOT: another_unused
  26 GC: another_used
  27 GC-NOT: bar
  28 GC: baz
  29 GC: baz_ref
  30 GC: foo
  31 GC-NOT: unused
  32 GC: used
  33
  34 #--- a.s
  35 .global _start
  36 _start:
  37  call foo
  38  call used
  39
  40 .section .text.foo,"ax",@progbits
  41 foo:
  42  nop
  43
  44 .section .text.bar,"ax",@progbits
  45 .global bar
  46 bar:
  47  nop
  48
  49 .section .text.baz,"ax",@progbits
  50 .global baz
  51 baz:
  52  nop
  53
  54
  55 #--- script.t
  56 PROVIDE(unused = bar + "used");
  57 PROVIDE("used" = another_used);
  58 PROVIDE(baz_ref = baz);
  59 PROVIDE(another_used = baz_ref);
  60 PROVIDE(another_unused = unused + bar + 0x1);