=> 0x4064ff:	mov    0x0(%rbp),%rdi
   0x406503:	mov    %r13,%rsi
   0x406506:	callq  0x403b40 <g_type_check_instance_cast@plt>
   0x40650b:	xor    %esi,%esi
   0x40650d:	mov    %r15,%rdx
   0x406510:	mov    %rax,%rdi
   0x406513:	mov    %rax,%r12
   0x406516:	callq  0x403f70 <e_cal_client_new@plt>
   0x40651b:	test   %rax,%rax
   0x40651e:	mov    %rax,%rbx
   0x406521:	je     0x406880
   0x406527:	mov    0x205142(%rip),%rdi        # 0x60b670
   0x40652e:	callq  0x4040c0 <icaltimezone_get_builtin_timezone@plt>
   0x406533:	test   %rax,%rax
   0x406536:	je     0x4069b0
   0x40653c:	mov    %rax,%rsi