lld/test/ELF/merge-sym-gc.s

   1 # REQUIRES: x86
   2 ## Show how symbols in GCed mergeable pieces behave.
   3
   4 # RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
   5 # RUN: ld.lld --gc-sections %t.o -o %t.elf
   6 # RUN: llvm-readelf %t.elf --sections --syms | FileCheck %s
   7
   8 .section .rodata.merge,"aM",@progbits,4
   9 a1: ## Unreferenced. In first fragment, kept by a2 reference.
  10     .short 1
  11 a2: ## Referenced.
  12     .short 1
  13 b1: ## Unreferenced. Discarded as second fragment is unreferenced.
  14     .short 1
  15 b2: ## Unreferenced. Discarded as second fragment is unreferenced.
  16     .short 1
  17 c1: ## Referenced.
  18     .short 1
  19 c2: ## Unreferenced. In third fragment, kept by c1 reference.
  20     .short 1
  21
  22 .data
  23 .global _start
  24 _start:
  25     .quad a2
  26     .quad c1
  27
  28 # CHECK:      .rodata PROGBITS [[#%x, ADDR:]]
  29
  30 # CHECK:      Symbol table '.symtab' contains 6 entries:
  31 # CHECK-NEXT:   Num:    Value          {{.*}} Ndx Name
  32 # CHECK-NEXT:     0:                   {{.*}} UND{{ *$}}
  33 # CHECK-NEXT:     1: {{0*}}[[#ADDR]]   {{.*}}     a1
  34 # CHECK-NEXT:     2: {{0*}}[[#ADDR+2]] {{.*}}     a2
  35 # CHECK-NEXT:     3: {{0*}}[[#ADDR]]   {{.*}}     c1
  36 # CHECK-NEXT:     4: {{0*}}[[#ADDR+2]] {{.*}}     c2
  37 # CHECK-NEXT:     5:                   {{.*}}     _start