lld/test/ELF/icf-preemptible.s

   1 # REQUIRES: x86
   2
   3 # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
   4 # RUN: ld.lld -pie %t.o --icf=all --print-icf-sections -o /dev/null | \
   5 # RUN:   FileCheck --check-prefixes=EXE %s
   6
   7 # RUN: ld.lld -shared %t.o --icf=all --print-icf-sections -o /dev/null | \
   8 # RUN:   FileCheck --check-prefix=DSO %s
   9
  10 ## Definitions are non-preemptible in an executable.
  11 # EXE-NOT:  {{.}}
  12 # EXE:      selected section {{.*}}:(.text.g1)
  13 # EXE-NEXT:   removing identical section {{.*}}:(.text.g2)
  14 # EXE-NEXT:   removing identical section {{.*}}:(.text.g3)
  15 # EXE-NEXT: selected section {{.*}}:(.text.f1)
  16 # EXE-NEXT:   removing identical section {{.*}}:(.text.f2)
  17 # EXE-NEXT: selected section {{.*}}:(.text.h1)
  18 # EXE-NEXT:   removing identical section {{.*}}:(.text.h2)
  19 # EXE-NEXT:   removing identical section {{.*}}:(.text.h3)
  20 # EXE-NOT:  {{.}}
  21
  22 ## Definitions are preemptible in a DSO. Only leaf functions can be folded.
  23 # DSO-NOT:  {{.}}
  24 # DSO:      selected section {{.*}}:(.text.g1)
  25 # DSO-NEXT:   removing identical section {{.*}}:(.text.g3)
  26 # DSO-NEXT: selected section {{.*}}:(.text.f1)
  27 # DSO-NEXT:   removing identical section {{.*}}:(.text.f2)
  28 # DSO-NOT:  {{.}}
  29
  30 .globl _start, f1, f2, g1, g2, g3
  31 _start:
  32
  33 .section .text.f1
  34 f1: ret
  35 .section .text.f2
  36 f2: ret
  37
  38 ## In -shared mode, .text.g1 and .text.g2 cannot be folded because f1 and f2 are
  39 ## preemptible and may refer to different functions at runtime.
  40 .section .text.g1
  41 g1: jmp f1@plt
  42 .section .text.g2
  43 g2: jmp f2@plt
  44 .section .text.g3
  45 g3: jmp f1@plt
  46
  47 ## In -shared mode, the sections below cannot be folded because g1, g2 and g3
  48 ## are preemptible and may refer to different functions at runtime.
  49 .section .text.h1
  50 jmp g1@plt
  51 .section .text.h2
  52 jmp g2@plt
  53 .section .text.h3
  54 jmp g3@plt