PL_sharedsv_space
PL_sharedsv_space_mutex
PL_dollarzero_mutex
+ PL_hints_mutex
Perl_dirp_dup
Perl_cx_dup
Perl_si_dup
PerlIO_sv_dup
Perl_PerlIO_clearerr
Perl_PerlIO_close
+ Perl_PerlIO_context_layers
Perl_PerlIO_eof
Perl_PerlIO_error
Perl_PerlIO_fileno