Ruby 2.7.7p221 (2022-11-24 revision 168ec2b1e5ad0e4688e963d9de019557c78feed9)
Data Structures
Here are the data structures with brief descriptions:
[detail level 12]
 C__pthread_attr_t
 C__pthread_barrier_t
 C__pthread_barrierattr_t
 C__pthread_cond_t
 C__pthread_condattr_t
 C__pthread_key_t
 C__pthread_mutex_t
 C__pthread_mutexattr_t
 C__pthread_rwlock_t
 C__pthread_rwlockattr_t
 C__pthread_spinlock_t
 C__pthread_t
 C__sbuf
 C__sFILE
 C__sFILE64
 C__siov
 C__suio
 C__tm
 C_atexit
 C_BBuf
 C_Bigint
 C_d
 C_fpstate
 C_glue
 C_mbstate_t
 C_Node
 C_NtCmdLineElement
 C_on_exit_args
 C_OnigStackType
 C_pthread_cleanup_handler
 C_rand48
 C_reent
 C_SHA256_CTX
 C_SHA512_CTX
 C_sigcommune
 C_uc_fpxreg
 C_uc_xmmreg
 C_Win32OLEIDispatch
 CA
 Caccept_arg
 Caccess_arg
 Caccessor_args
 Cadd_option_arg
 Caddrinfo
 Caix_fd_struct
 Callocation_info
 CAnchorNode
 Capply_arg
 Capply_filename
 Car_table_pair_struct
 Car_table_struct
 Carg_state
 Cargf
 Cargf_call_arg
 Cargs_info
 Carith_seq_gen
 Cary_sort_data
 Casciicompat_encoding_t
 CASTNodeData
 Casynchronous_arg_t
 Cautoload_const
 Cautoload_data_i
 Cautoload_state
 CB
 Cbackref_name_tag
 Cbig2str_struct
 Cbig_div_struct
 CBigint
 CBigStruct
 Cbinwrite_arg
 Cbrace_args
 CBRefNode
 Cbt_iter_arg
 Cbufread_arg
 Cbuiltin_binary
 Cbytesequence4_or_float
 CC
 CC_block
 Ccache_entry
 Ccall_context
 Ccallback_args
 CCallNode
 CCClassNode
 Ccdhash_set_label_struct
 Ccfunc_proc_t
 CCHAR64LONG16
 Cchdir_data
 Cchild_info
 Cchown_args
 Cchunk_arg
 Cclone_const_arg
 Cclone_method_arg
 Ccls_struct_12byte
 Ccls_struct_16byte
 Ccls_struct_16byte1
 Ccls_struct_16byte2
 Ccls_struct_18byte
 Ccls_struct_19byte
 Ccls_struct_1_1byte
 Ccls_struct_20byte
 Ccls_struct_24byte
 Ccls_struct_2byte
 Ccls_struct_3_1byte
 Ccls_struct_3byte
 Ccls_struct_3byte_1
 Ccls_struct_4_1byte
 Ccls_struct_4byte
 Ccls_struct_5byte
 Ccls_struct_64byte
 Ccls_struct_6byte
 Ccls_struct_7byte
 Ccls_struct_8byte
 Ccls_struct_9byte
 Ccls_struct_align
 Ccls_struct_combined
 Ccmp_opt_data
 Ccollect_caller_bindings_data
 CComplexDateData
 Cconnect_arg
 CConsAltNode
 Cconstat
 Ccont_saved_vm_stack
 Ccookie_io_functions_t
 Ccopy_stream_struct
 Ccoroutine_context
 Ccparse_params
 Ccpu_set_t
 Ccrypt_data
 CCRYPTO_dynlock_valueStores locks needed for OpenSSL thread safety
 CCtypeNode
 CDateData
 Cdatum
 CDbls
 CDBM
 Cdbmdata
 Cdefault_encoding
 Cdes_tables_t
 Cdh_blocking_gen_arg
 CDIR
 Cdir_data
 Cdirect
 Cdirent_brace_args
 Cdiv_t
 Cdl_handle
 CDOUBLE_SWAPPER
 Cdsa_blocking_gen_arg
 Cdump_arg
 Cdump_call_arg
 Cdump_config
 Cdynamic_symbol_counts
 Ceach_obj_args
 CEncloseNode
 Cend_proc_data
 Censure_range
 Cenum_chain
 Cenum_sum_memo
 Cenumerator
 Cequal_data
 Ceval_string_wrap_arg
 Cexec_recursive_params
 Cextended_cif
 CFBufferStruct
 Cfd_set
 Cffi_dblfl
 Cfiber_pool
 Cfiber_pool_allocation
 Cfiber_pool_stack
 Cfiber_pool_vacancy
 Cfiddle_closure
 Cfiddle_generic
 CFILE_ID_128
 CFILE_ID_INFO
 Cfill_values_arg
 Cfinish_writeconv_arg
 CFLOAT_SWAPPER
 Cflock
 Cforce_finalize_list
 Cforeach_arg
 Cforeach_safe_arg
 Cfpreg
 Cfunctor
 Cgc_list
 Cgc_profile_record
 Cgc_raise_tag
 Cgen_ivar_tag
 Cgen_ivtbl
 Cgenerator
 Cgetaddrinfo_arg
 Cgetline_arg
 Cgetnameinfo_arg
 Cgivar_copy
 Cglob_args
 Cglob_error_args
 Cglob_pattern
 CGroupNumRemap
 Cgzfile
 Chash_foreach_arg
 Cheap_cursor
 Cheap_page
 Cheap_page_body
 Cheap_page_header
 Chostent_arg
 Cia64_args
 CIApplyCaseFoldArg
 Cibf_dump
 Cibf_dump_buffer
 Cibf_header
 Cibf_load
 Cibf_load_buffer
 Cibf_object_bignum
 Cibf_object_complex_rational
 Cibf_object_hash
 Cibf_object_header
 Cibf_object_regexp
 Cibf_object_struct_range
 Cibf_object_symbol
 CIEventSink
 CIEventSinkVtbl
 Cifaddrs
 Cimaxdiv_t
 CINamesArg
 Cinetsock_arg
 Cinput_code
 Cinsn_data_struct
 Cio_encoding_set_args
 Cio_internal_read_struct
 Cio_internal_write_struct
 Cioinfo
 Ciovec
 Ciseq_adjust_data
 Ciseq_catch_table
 Ciseq_catch_table_entry
 Ciseq_compile_data
 Ciseq_compile_data_ensure_node_stack
 Ciseq_compile_data_storage
 Ciseq_inline_cache_entry
 Ciseq_inline_iv_cache_entry
 Ciseq_inline_storage_entry
 Ciseq_insn_data
 Ciseq_insn_info_entry
 Ciseq_label_data
 Ciseq_link_anchor
 Ciseq_link_element
 Ciseq_trace_data
 Citer_method_arg
 Citimerspec
 Civar_update
 Cjoin_arg
 CJSON_Generator_StateStruct
 CJSON_ParserStruct
 Ckwtable
 Clarge_tag
 Clazyenum_funcs
 Cldiv_t
 Clist_head
 Clist_node
 Clldiv_t
 Cload_arg
 Cload_file_arg
 Cloaded_feature_searching
 Clocal_var_list
 Clocal_vars
 Cmagic_comment
 Cmallinfo
 Cmalloc_chunk
 Cmalloc_obj_info
 Cmalloc_params
 Cmalloc_segment
 Cmalloc_state
 Cmalloc_tree_chunk
 Cmapping_buffer
 Cmark_stack
 Cmarshal_compat_t
 Cmax_align_t
 Cmax_t
 Cmd5_state_s
 CMEMOMEMO
 CMETHOD
 Cmethod_entry_arg
 Cmin_t
 Cminmax_by_t
 Cminmax_t
 CMinMaxLen
 Cmjit_copy_job_t
 Cmjit_options
 Cmkdir_arg
 Cmsghdr
 CMT
 Cmy_ffi_struct
 CmyCPINFOEX
 CNameEntry
 Cnative_thread_data_struct
 CNET_LUID
 Cnew_wrap_arg_t
 Cnkf_buf_t
 Cnkf_encoding
 Cnkf_native_encoding
 Cnkf_state_t
 Cnmin_data
 Cno_gvl_stat_data
 Cnode_buffer_elem_struct
 Cnode_buffer_list_t
 Cnode_buffer_struct
 CNodeBase
 CNodeOptInfo
 Cnogvl_ffi_call_args
 Cnpn_select_cb_common_args
 Cobj_ivar_tag
 Cobjspace_and_reason
 Coldbt_arg
 Coledata
 Coleeventdata
 Colemethoddata
 Coleparam
 Coleparamdata
 Colerecorddata
 Coletypedata
 Coletypelibdata
 Colevariabledata
 Colevariantdata
 COnigCaseFoldCodeItem
 COnigCompileInfo
 COnigEncodingTypeST
 COnigEndCallListItem
 COnigErrorInfo
 COnigMatchArg
 COnigMetaCharTableType
 COnigPairCaseFoldCodes
 COnigRepeatRange
 COnigSyntaxType
 COnigToken
 Copen_struct
 Copendir_at_arg
 COptAncInfo
 COptEnv
 COptExactInfo
 Coptional
 COptMapInfo
 Cos_each_struct
 Cossl_asn1_info_t
 Cossl_generate_cb_arg
 Cossl_verify_cb_args
 Cpair_t
 Cparser_params
 CPoint
 CPosixBracketEntryType
 Cprint_to_arg
 Cproc_entry
 Cproducer
 Cpthread_once_t
 Cptr_data
 Cpty_info
 Cpush_glob0_args
 Cpush_glob_args
 CQtfrNode
 Cquery_args
 Cqueue_waiter
 CRArray
 Crawmode_arg_t
 Crb_addrinfo
 Crb_addrinfo_t
 Crb_args_info
 Crb_arithmetic_sequence_components_t
 Crb_ary_pattern_info
 Crb_ast_body_struct
 Crb_ast_struct
 Crb_at_exit_list
 Crb_backtrace_location_struct
 Crb_backtrace_struct
 Crb_binding_t
 Crb_block
 Crb_blocking_region_buffer
 Crb_builtin_function
 Crb_call_cache
 Crb_call_data
 Crb_call_info
 Crb_call_info_kw_arg
 Crb_call_info_with_kwarg
 Crb_callable_method_entry_struct
 Crb_calling_info
 Crb_captured_block
 Crb_classext_struct
 Crb_code_location_struct
 Crb_code_position_struct
 Crb_compile_option_struct
 Crb_condvar
 Crb_const_entry_struct
 Crb_context_struct
 Crb_control_frame_struct
 Crb_cref_structCREF (Class REFerence)
 Crb_data_type_struct
 Crb_debug_inspector_struct
 Crb_deprecated_classext_struct
 Crb_digest_metadata_t
 Crb_econv_elem_t
 Crb_econv_init_by_convpath_t
 Crb_econv_t
 Crb_encoding_entry
 Crb_ensure_entry
 Crb_ensure_list
 Crb_env_t
 Crb_event_hook_struct
 Crb_execarg
 Crb_execution_context_struct
 Crb_f_p_arg
 Crb_fdset_t
 Crb_fiber_struct
 Crb_global_entry
 Crb_global_variable
 Crb_global_vm_lock_struct
 Crb_heap_struct
 Crb_hook_list_struct
 Crb_id_item
 Crb_id_table
 Crb_imemo_tmpbuf_struct
 Crb_io_t
 Crb_iseq_constant_body
 Crb_iseq_location_struct
 Crb_iseq_new_with_callback_callback_func
 Crb_iseq_struct
 Crb_kwarg_call_data
 Crb_method_alias_struct
 Crb_method_attr_struct
 Crb_method_bmethod_struct
 Crb_method_cfunc_struct
 Crb_method_definition_struct
 Crb_method_entry_struct
 Crb_method_iseq_struct
 Crb_method_refined_struct
 Crb_mjit_compile_info
 Crb_mjit_unit
 Crb_mjit_unit_list
 Crb_monitor
 Crb_mutex_struct
 Crb_objspace
 Crb_postponed_job_struct
 Crb_printf_buffer_extra
 Crb_proc_t
 Crb_random_t
 Crb_scan_args_t
 Crb_scope_visi_struct
 Crb_strterm_heredoc_struct
 Crb_strterm_literal_struct
 Crb_strterm_struct
 Crb_subclass_entry
 Crb_symbols_t
 Crb_thread_cond_struct
 Crb_thread_list_struct
 Crb_thread_struct
 Crb_tp_struct
 Crb_trace_arg_struct
 Crb_transcoder
 Crb_transcoding
 Crb_unblock_callback
 Crb_vm_protect_tag
 Crb_vm_struct
 Crb_vm_tag
 Crb_w32_reparse_buffer_t
 Crb_workqueue_job
 CRBasicRaw
 CRBignum
 CRClass
 CRComplex
 CRData
 Cre_pattern_buffer
 Cre_registers
 Cread_raw_arg
 CReal
 CRect
 Crecvfrom_arg
 Creg_named_capture_assign_t
 Crehash_arg
 Crename_args
 Crescue_funcall_args
 Creset_hash_type_arg
 CRFile
 CRFloat
 CRHash
 CRIMemo
 Cripper_scanner_ids_t
 Crmatch
 CRMatch
 Crmatch_offset
 CRMD160_CTX
 CRMoved
 CRNode
 CRObject
 Crof_data
 Crofr_data
 Croot_objects_data
 CRRational
 CRRegexp
 Crsa_blocking_gen_arg
 Crsock_send_arg
 CRString
 CRStruct
 CRSymbol
 CRTypedData
 Cruby_cmdline_options
 Cruby_dtrace_method_hook_args
 Cruby_features_t
 Cruby_gc_params_t
 Cruby_glob_funcs_t
 Crun_exec_dup2_fd_pair
 CRVALUE
 CRZombie
 CScanEnv
 Csched_param
 Csearch_path_bfs_t
 Csearch_path_queue_tag
 Cseed_keys_t
 Cseek_arg
 Cselect_args
 Cselect_bang_arg
 Cselect_set
 CSHA1_CTX
 Cshift_var
 Csigaction
 Csigaltstack
 Csigevent
 Csiginfo_t
 Csigval
 CSimpleDateData
 Csip_hash
 Csip_state
 Csip_uint64_t
 CSize
 Csleep_call
 Csliceafter_arg
 Cslicebefore_arg
 Cslicewhen_arg
 Csmall_tag
 Csockaddr_storage
 Csockinet
 Csort_by_data
 Cspawn_args
 Cst_features
 Cst_hash_type
 Cst_str_end_key
 Cst_table
 Cst_table_entry
 Cstack_chunk
 Cstack_node
 Cstat
 Cstati128
 Cstring_part
 CStringIO
 Cstringpool_t
 CStrNode
 Cstrscanner
 Cstruct_108byte
 Cstruct_116byte
 Cstruct_72byte
 Cstruct_hash_set_arg
 Csucc_index_table
 Csync_waiter
 Csysopen_struct
 CtagIEVENTSINKOBJ
 Ctest_structure_1
 Ctest_structure_2
 Ctest_structure_3
 Ctest_structure_4
 Ctest_structure_5
 Ctest_structure_6
 Ctest_structure_7
 Ctest_structure_8
 Ctest_structure_9
 Cthgroup
 Ctimespec
 Ctimetick
 Ctimeval
 Ctimezone
 Ctm
 Ctmp_dh_callback_args
 Ctms
 Ctmx
 Ctmx_funcs
 Ctoken_info
 Ctotal_data
 Ctr
 Ctrace_clear_local_events_struct
 Ctrace_data
 Ctrace_set_local_events_struct
 Ctrace_var
 Ctraceobj_arg
 Ctrans_open_t
 Ctranscoder_entry_t
 Ctransient_alloc_header
 Ctransient_heap
 Ctransient_heap_block
 Cttymode_callback_args
 CU
 Cudp_arg
 Cudp_send_arg
 Cunion_sockaddr
 CUnsetAddr
 CUnsetAddrList
 Cupdate_arg
 Cupdate_callback_arg
 Cupdate_func_arg
 Cutimbuf
 Cutime_args
 Cvalue_type
 Cvalued_frame_info
 Cverify_internal_consistency_struct
 Cvm_ifuncIFUNC (Internal FUNCtion)
 Cvm_ifunc_argc
 Cvm_svarSVAR (Special VARiable)
 Cvm_throw_dataTHROW_DATA
 Cvtable
 Cw32_io_info_args
 Cw32_io_info_t
 Cw_ivar_arg
 Cwait_for_cond_data
 Cwaiting_fd
 Cwaitpid_state
 Cwarning_args
 Cweakmap
 Cwmap_iter_arg
 Cwrite_arg
 CWSAMSG
 Cyielder
 Cyyalloc
 CYYLTYPE
 Cyypcontext_t
 CYYSTYPE
 Czone
 Czstream
 Czstream_run_args