lld/test/ELF/wrap-defined.s

   1 # REQUIRES: x86
   2
   3 # RUN: rm -rf %t && split-file %s %t
   4 # RUN: llvm-mc -filetype=obj -triple=x86_64 %t/main.s -o %t/main.o
   5 # RUN: llvm-mc -filetype=obj -triple=x86_64 %t/wrap.s -o %t/wrap.o
   6 # RUN: ld.lld -shared --soname=fixed %t/wrap.o -o %t/wrap.so
   7
   8 ## GNU ld does not wrap a defined symbol in an object file
   9 ## https://sourceware.org/bugzilla/show_bug.cgi?id=26358
  10 ## We choose to wrap defined symbols so that LTO, non-LTO and relocatable links
  11 ## behave the same. The 'call bar' in main.o will reference __wrap_bar. We cannot
  12 ## easily distinguish the case from cases where bar is not referenced, so we
  13 ## export __wrap_bar whenever bar is defined, regardless of whether it is indeed
  14 ## referenced.
  15
  16 # RUN: ld.lld -shared %t/main.o --wrap bar -o %t1.so
  17 # RUN: llvm-objdump -d %t1.so | FileCheck %s
  18 # RUN: ld.lld %t/main.o %t/wrap.so --wrap bar -o %t1
  19 # RUN: llvm-objdump -d %t1 | FileCheck %s
  20
  21 # CHECK:      <_start>:
  22 # CHECK-NEXT:   callq {{.*}} <__wrap_bar@plt>
  23
  24 #--- main.s
  25 .globl _start, bar
  26 _start:
  27   call bar
  28 bar:
  29
  30 #--- wrap.s
  31 .globl __wrap_bar
  32 __wrap_bar:
  33   retq