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https://github.com/warmcat/libwebsockets.git
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3549a94ce6
role ops are usually only sparsely filled, there are currently 20 function pointers but several roles only fill in two. No single role has more than 14 of the ops. On a 32/64 bit build this part of the ops struct takes a fixed 80 / 160 bytes then. First reduce the type of the callback reason part from uint16_t to uint8_t, this saves 12 bytes unconditionally. Change to a separate function pointer array with a nybble index array, it costs 10 bytes for the index and a pointer to the separate array, for 32-bit the cost is 2 + (4 x ops_used) and for 64-bit 6 + (8 x ops_used) for 2 x ops_used it means 32-bit: 10 vs 80 / 64-bit: 22 vs 160 For a typical system with h1 (9), h2 (14), listen (2), netlink (2), pipe (1), raw_skt (3), ws (12), == 43 ops_used out of 140, it means the .rodata for this reduced from 32-bit: 560 -> 174 (386 byte saving) and 64-bit: 1120 -> 350 (770 byte saving) This doesn't account for the changed function ops calling code, two ways were tried, a preprocessor macro and explicit functions For an x86_64 gcc 10 build with most options, release mode, .text + .rodata before patch: 553282 accessor macro: 552714 (568 byte saving) accessor functions: 553674 (392 bytes worse than without patch) therefore we went with the macros
127 lines
4.3 KiB
C
127 lines
4.3 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <private-lib-core.h>
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static int
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rops_handle_POLLIN_raw_file(struct lws_context_per_thread *pt, struct lws *wsi,
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struct lws_pollfd *pollfd)
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{
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int n;
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if (pollfd->revents & LWS_POLLOUT) {
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n = lws_callback_as_writeable(wsi);
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if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
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lwsl_info("failed at set pollfd\n");
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return LWS_HPI_RET_WSI_ALREADY_DIED;
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}
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if (n)
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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}
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if (pollfd->revents & LWS_POLLIN) {
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if (user_callback_handle_rxflow(wsi->a.protocol->callback,
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wsi, LWS_CALLBACK_RAW_RX_FILE,
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wsi->user_space, NULL, 0)) {
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lwsl_debug("raw rx callback closed it\n");
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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}
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}
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if (pollfd->revents & LWS_POLLHUP)
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if (!(pollfd->revents & LWS_POLLIN))
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return LWS_HPI_RET_PLEASE_CLOSE_ME;
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return LWS_HPI_RET_HANDLED;
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}
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static int
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rops_adoption_bind_raw_file(struct lws *wsi, int type, const char *vh_prot_name)
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{
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/* no socket or http: it can only be a raw file */
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if ((type & LWS_ADOPT_HTTP) || (type & LWS_ADOPT_SOCKET) ||
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(type & _LWS_ADOPT_FINISH))
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return 0; /* no match */
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lws_role_transition(wsi, 0, LRS_ESTABLISHED, &role_ops_raw_file);
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if (!vh_prot_name) {
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if (wsi->a.vhost->default_protocol_index >=
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wsi->a.vhost->count_protocols)
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return 0;
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wsi->a.protocol = &wsi->a.vhost->protocols[
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wsi->a.vhost->default_protocol_index];
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}
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return 1; /* bound */
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}
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static const lws_rops_t rops_table_raw_file[] = {
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/* 1 */ { .handle_POLLIN = rops_handle_POLLIN_raw_file },
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/* 2 */ { .adoption_bind = rops_adoption_bind_raw_file },
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};
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const struct lws_role_ops role_ops_raw_file = {
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/* role name */ "raw-file",
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/* alpn id */ NULL,
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/* rops_table */ rops_table_raw_file,
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/* rops_idx */ {
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/* LWS_ROPS_check_upgrades */
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/* LWS_ROPS_pt_init_destroy */ 0x00,
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/* LWS_ROPS_init_vhost */
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/* LWS_ROPS_destroy_vhost */ 0x00,
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/* LWS_ROPS_service_flag_pending */
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/* LWS_ROPS_handle_POLLIN */ 0x01,
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/* LWS_ROPS_handle_POLLOUT */
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/* LWS_ROPS_perform_user_POLLOUT */ 0x00,
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/* LWS_ROPS_callback_on_writable */
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/* LWS_ROPS_tx_credit */ 0x00,
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/* LWS_ROPS_write_role_protocol */
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/* LWS_ROPS_encapsulation_parent */ 0x00,
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/* LWS_ROPS_alpn_negotiated */
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/* LWS_ROPS_close_via_role_protocol */ 0x00,
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/* LWS_ROPS_close_role */
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/* LWS_ROPS_close_kill_connection */ 0x00,
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/* LWS_ROPS_destroy_role */
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/* LWS_ROPS_adoption_bind */ 0x02,
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/* LWS_ROPS_client_bind */
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/* LWS_ROPS_issue_keepalive */ 0x00,
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},
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/* adoption_cb clnt, srv */ { LWS_CALLBACK_RAW_ADOPT_FILE,
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LWS_CALLBACK_RAW_ADOPT_FILE },
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/* rx_cb clnt, srv */ { LWS_CALLBACK_RAW_RX_FILE,
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LWS_CALLBACK_RAW_RX_FILE },
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/* writeable cb clnt, srv */ { LWS_CALLBACK_RAW_WRITEABLE_FILE,
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LWS_CALLBACK_RAW_WRITEABLE_FILE},
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/* close cb clnt, srv */ { LWS_CALLBACK_RAW_CLOSE_FILE,
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LWS_CALLBACK_RAW_CLOSE_FILE},
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/* protocol_bind cb c, srv */ { LWS_CALLBACK_RAW_FILE_BIND_PROTOCOL,
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LWS_CALLBACK_RAW_FILE_BIND_PROTOCOL },
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/* protocol_unbind cb c, srv */ { LWS_CALLBACK_RAW_FILE_DROP_PROTOCOL,
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LWS_CALLBACK_RAW_FILE_DROP_PROTOCOL },
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/* file_handle */ 1,
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};
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