Ruby 2.7.0p0(2019-12-25revision647ee6f091eafcce70ffb75ddf7e121e192ab217)

### - o -

- o : BigStruct , Rect , struct_116byte
- o_file : rb_mjit_unit
- o_file_inherited_p : rb_mjit_unit
- obj : _Win32OLEIDispatch , dump_call_arg , enumerator , exec_recursive_params , force_finalize_list , generator , givar_copy , iter_method_arg , obj_ivar_tag , rb_iseq_struct , Real , transient_alloc_header
- obj2wmap : weakmap
- obj_list : ibf_dump_buffer , ibf_load_buffer
- obj_list_offset : ibf_load_buffer
- obj_list_size : ibf_load_buffer
- obj_to_id_tbl : rb_objspace
- object : RVALUE
- object_class : JSON_ParserStruct
- object_delim : JSON_Generator_StateStruct
- object_delim2 : JSON_Generator_StateStruct
- object_nl : JSON_Generator_StateStruct
- object_nl_len : JSON_Generator_StateStruct
- object_table : traceobj_arg
- objects : transient_heap_block::transient_heap_block_header
- objspace : each_obj_args , heap_cursor , objspace_and_reason , rb_vm_struct , verify_internal_consistency_struct , wmap_iter_arg
- oconv : nkf_native_encoding
- of : ComplexDateData , os_each_struct
- offset : __tzrule_struct , load_arg , rb_strterm_heredoc_struct , seek_arg , tmx_funcs , UnsetAddr , zone
- oflags : open_struct , sysopen_struct
- old_key : update_arg
- old_klass : clone_method_arg
- old_object_count : verify_internal_consistency_struct
- old_objects : rb_objspace
- old_objects_limit : rb_objspace
- old_path : chdir_data
- old_value : update_arg
- oldclass : marshal_compat_t
- older_index : run_exec_dup2_fd_pair
- oldfd : run_exec_dup2_fd_pair
- oldmalloc_increase : rb_objspace
- oldmalloc_increase_limit : rb_objspace
- oldmalloc_limit_growth_factor : ruby_gc_params_t
- oldmalloc_limit_max : ruby_gc_params_t
- oldmalloc_limit_min : ruby_gc_params_t
- oldobject_limit_factor : ruby_gc_params_t
- on : mjit_options
- once : iseq_inline_storage_entry
- one_or_more_time : OnigMetaCharTableType
- oo : BigStruct
- op : OnigSyntaxType
- op2 : OnigSyntaxType
- open : dl_handle
- operand_size : iseq_insn_data
- operands : iseq_insn_data
- operands_unification : rb_compile_option_struct
- opt : io_encoding_set_args , load_file_arg , query_args
- opt_args : rb_args_info
- opt_count : EncloseNode
- opt_inited : cmp_opt_data
- opt_methods : cmp_opt_data
- opt_num : rb_iseq_constant_body
- opt_table : rb_iseq_constant_body
- optimize : re_pattern_buffer
- optimize_type : rb_method_definition_struct
- option : EncloseNode , ibf_object_regexp , iseq_compile_data , OnigCompileInfo , ScanEnv
- options : OnigMatchArg , OnigSyntaxType , OptEnv , re_pattern_buffer , waitpid_state
- ordblks : mallinfo
- orig_argc : rb_call_info
- orig_eset : select_set
- orig_me : rb_method_refined_struct
- orig_name : gzfile
- orig_progname : rb_vm_struct
- orig_rset : select_set
- orig_wset : select_set
- orighash : reset_hash_type_arg
- origin_ : rb_classext_struct
- original_id : rb_method_definition_struct
- original_iseq : rb_iseq_constant_body
- original_me : rb_method_alias_struct
- os_code : gzfile
- osfhnd : ioinfo
- osfile : ioinfo
- other_args : ia64_args
- others : vm_svar
- out_buf_end : rb_econv_elem_t
- out_buf_start : rb_econv_elem_t
- out_data_end : rb_econv_elem_t
- out_data_start : rb_econv_elem_t
- outer : local_vars
- output : print_to_arg
- output_index : rb_transcoding
- owner : chown_args , CRYPTO_dynlock_value , rb_callable_method_entry_struct , rb_global_vm_lock_struct , rb_method_entry_struct , rb_method_refined_struct , rb_monitor