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

   1 # REQUIRES: x86
   2 # RUN: llvm-mc %s -o %t.o -filetype=obj -triple=x86_64-pc-linux
   3
   4 ## Discard an unused .gcc_except_table in a COMDAT group or having SHF_LINK_ORDER
   5 ## if the associated text section is discarded.
   6
   7 # RUN: ld.lld --gc-sections --print-gc-sections -u _Z3foov %t.o -o /dev/null | \
   8 # RUN:   FileCheck %s --implicit-check-not=.gcc_except_table
   9
  10 # CHECK:      removing unused section {{.*}}.o:(.text._Z6comdatv)
  11 # CHECK-NEXT: removing unused section {{.*}}.o:(.text._Z9linkorderv)
  12 # CHECK-NEXT: removing unused section {{.*}}.o:(.gcc_except_table._Z6comdatv)
  13 # CHECK-NEXT: removing unused section {{.*}}.o:(.gcc_except_table._Z9linkorderv)
  14
  15 ## An unused non-group non-SHF_LINK_ORDER .gcc_except_table is not discarded.
  16
  17 # RUN: ld.lld --gc-sections --print-gc-sections -u _Z6comdatv -u _Z9linkorderv %t.o -o /dev/null | \
  18 # RUN:   FileCheck /dev/null --implicit-check-not=.gcc_except_table
  19
  20 ## If the text sections are live, the .gcc_except_table sections are retained as
  21 ## well because they are referenced by .eh_frame pieces.
  22
  23 # RUN: ld.lld --gc-sections --print-gc-sections -u _Z3foov -u _Z6comdatv -u _Z9linkorderv %t.o -o /dev/null | \
  24 # RUN:   FileCheck %s --check-prefix=KEEP
  25
  26 # KEEP-NOT: .gcc_except_table
  27
  28 .section .text._Z3foov,"ax",@progbits
  29 .globl _Z3foov
  30 _Z3foov:
  31   .cfi_startproc
  32   ret
  33   .cfi_lsda 0x1b,.Lexception0
  34   .cfi_endproc
  35
  36 .section .text._Z6comdatv,"axG",@progbits,_Z6comdatv,comdat
  37 .globl _Z6comdatv
  38 _Z6comdatv:
  39   .cfi_startproc
  40   ret
  41   .cfi_lsda 0x1b,.Lexception1
  42   .cfi_endproc
  43
  44 .section .text._Z9linkorderv,"ax",@progbits
  45 .globl _Z9linkorderv
  46 _Z9linkorderv:
  47   .cfi_startproc
  48   ret
  49   .cfi_lsda 0x1b,.Lexception2
  50   .cfi_endproc
  51
  52 .section .gcc_except_table._Z3foov,"a",@progbits
  53 .Lexception0:
  54   .byte 255
  55
  56 .section .gcc_except_table._Z6comdatv,"aG",@progbits,_Z6comdatv,comdat
  57 .Lexception1:
  58   .byte 255
  59
  60 .section .gcc_except_table._Z9linkorderv,"ao",@progbits,_Z9linkorderv
  61 .Lexception2:
  62   .byte 255