llvm/test/ExecutionEngine/JITLink/X86/MachO_GOTAndStubsOptimization.s

   1 # RUN: rm -rf %t && mkdir -p %t
   2 # RUN: llvm-mc -triple=x86_64-apple-macos10.9 -filetype=obj \
   3 # RUN:   -o %t/helper.o %S/Inputs/MachO_GOTAndStubsOptimizationHelper.s
   4 # RUN: llvm-mc -triple=x86_64-apple-macos10.9 -filetype=obj \
   5 # RUN:   -o %t/testcase.o %s
   6 # RUN: llvm-jitlink -noexec -slab-allocate 64Kb -entry=bypass_stub -check %s \
   7 # RUN:   %t/testcase.o %t/helper.o
   8 #
   9 # Test that references to in-range GOT and stub targets can be bypassed.
  10 # The helper file contains a function that uses the GOT for _x, and this file
  11 # contains an external call to that function. By slab allocating the JIT memory
  12 # we can ensure that the references and targets will be in-range of one another,
  13 # which should cause both the GOT load and stub to be bypassed.
  14
  15         .section        __TEXT,__text,regular,pure_instructions
  16         .macosx_version_min 10, 14
  17         .globl bypass_stub
  18         .p2align        4, 0x90
  19
  20 # jitlink-check: decode_operand(bypass_got, 4) = _x - next_pc(bypass_got)
  21 # jitlink-check: decode_operand(bypass_stub, 0) = bypass_got - next_pc(bypass_stub)
  22 bypass_stub:
  23         callq   bypass_got
  24
  25         .section        __DATA,__data
  26         .globl  _x
  27         .p2align        2
  28 _x:
  29         .long   42
  30
  31 .subsections_via_symbols