Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / tools / lib / traceevent / event-parse.c
bloba8b6357d1ffef8678d82b0ae357b445b9ba2cf71
1 /*
2 * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation;
8 * version 2.1 of the License (not later!)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this program; if not, see <http://www.gnu.org/licenses>
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
20 * The parts for function graph printing was taken and modified from the
21 * Linux Kernel that were written by
22 * - Copyright (C) 2009 Frederic Weisbecker,
23 * Frederic Weisbecker gave his permission to relicense the code to
24 * the Lesser General Public License.
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <stdarg.h>
30 #include <ctype.h>
31 #include <errno.h>
32 #include <stdint.h>
33 #include <limits.h>
35 #include <netinet/ip6.h>
36 #include "event-parse.h"
37 #include "event-utils.h"
39 static const char *input_buf;
40 static unsigned long long input_buf_ptr;
41 static unsigned long long input_buf_siz;
43 static int is_flag_field;
44 static int is_symbolic_field;
46 static int show_warning = 1;
48 #define do_warning(fmt, ...) \
49 do { \
50 if (show_warning) \
51 warning(fmt, ##__VA_ARGS__); \
52 } while (0)
54 #define do_warning_event(event, fmt, ...) \
55 do { \
56 if (!show_warning) \
57 continue; \
59 if (event) \
60 warning("[%s:%s] " fmt, event->system, \
61 event->name, ##__VA_ARGS__); \
62 else \
63 warning(fmt, ##__VA_ARGS__); \
64 } while (0)
66 static void init_input_buf(const char *buf, unsigned long long size)
68 input_buf = buf;
69 input_buf_siz = size;
70 input_buf_ptr = 0;
73 const char *pevent_get_input_buf(void)
75 return input_buf;
78 unsigned long long pevent_get_input_buf_ptr(void)
80 return input_buf_ptr;
83 struct event_handler {
84 struct event_handler *next;
85 int id;
86 const char *sys_name;
87 const char *event_name;
88 pevent_event_handler_func func;
89 void *context;
92 struct pevent_func_params {
93 struct pevent_func_params *next;
94 enum pevent_func_arg_type type;
97 struct pevent_function_handler {
98 struct pevent_function_handler *next;
99 enum pevent_func_arg_type ret_type;
100 char *name;
101 pevent_func_handler func;
102 struct pevent_func_params *params;
103 int nr_args;
106 static unsigned long long
107 process_defined_func(struct trace_seq *s, void *data, int size,
108 struct event_format *event, struct print_arg *arg);
110 static void free_func_handle(struct pevent_function_handler *func);
113 * pevent_buffer_init - init buffer for parsing
114 * @buf: buffer to parse
115 * @size: the size of the buffer
117 * For use with pevent_read_token(), this initializes the internal
118 * buffer that pevent_read_token() will parse.
120 void pevent_buffer_init(const char *buf, unsigned long long size)
122 init_input_buf(buf, size);
125 void breakpoint(void)
127 static int x;
128 x++;
131 struct print_arg *alloc_arg(void)
133 return calloc(1, sizeof(struct print_arg));
136 struct cmdline {
137 char *comm;
138 int pid;
141 static int cmdline_cmp(const void *a, const void *b)
143 const struct cmdline *ca = a;
144 const struct cmdline *cb = b;
146 if (ca->pid < cb->pid)
147 return -1;
148 if (ca->pid > cb->pid)
149 return 1;
151 return 0;
154 struct cmdline_list {
155 struct cmdline_list *next;
156 char *comm;
157 int pid;
160 static int cmdline_init(struct pevent *pevent)
162 struct cmdline_list *cmdlist = pevent->cmdlist;
163 struct cmdline_list *item;
164 struct cmdline *cmdlines;
165 int i;
167 cmdlines = malloc(sizeof(*cmdlines) * pevent->cmdline_count);
168 if (!cmdlines)
169 return -1;
171 i = 0;
172 while (cmdlist) {
173 cmdlines[i].pid = cmdlist->pid;
174 cmdlines[i].comm = cmdlist->comm;
175 i++;
176 item = cmdlist;
177 cmdlist = cmdlist->next;
178 free(item);
181 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
183 pevent->cmdlines = cmdlines;
184 pevent->cmdlist = NULL;
186 return 0;
189 static const char *find_cmdline(struct pevent *pevent, int pid)
191 const struct cmdline *comm;
192 struct cmdline key;
194 if (!pid)
195 return "<idle>";
197 if (!pevent->cmdlines && cmdline_init(pevent))
198 return "<not enough memory for cmdlines!>";
200 key.pid = pid;
202 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
203 sizeof(*pevent->cmdlines), cmdline_cmp);
205 if (comm)
206 return comm->comm;
207 return "<...>";
211 * pevent_pid_is_registered - return if a pid has a cmdline registered
212 * @pevent: handle for the pevent
213 * @pid: The pid to check if it has a cmdline registered with.
215 * Returns 1 if the pid has a cmdline mapped to it
216 * 0 otherwise.
218 int pevent_pid_is_registered(struct pevent *pevent, int pid)
220 const struct cmdline *comm;
221 struct cmdline key;
223 if (!pid)
224 return 1;
226 if (!pevent->cmdlines && cmdline_init(pevent))
227 return 0;
229 key.pid = pid;
231 comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
232 sizeof(*pevent->cmdlines), cmdline_cmp);
234 if (comm)
235 return 1;
236 return 0;
240 * If the command lines have been converted to an array, then
241 * we must add this pid. This is much slower than when cmdlines
242 * are added before the array is initialized.
244 static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
246 struct cmdline *cmdlines = pevent->cmdlines;
247 const struct cmdline *cmdline;
248 struct cmdline key;
250 if (!pid)
251 return 0;
253 /* avoid duplicates */
254 key.pid = pid;
256 cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
257 sizeof(*pevent->cmdlines), cmdline_cmp);
258 if (cmdline) {
259 errno = EEXIST;
260 return -1;
263 cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
264 if (!cmdlines) {
265 errno = ENOMEM;
266 return -1;
269 cmdlines[pevent->cmdline_count].comm = strdup(comm);
270 if (!cmdlines[pevent->cmdline_count].comm) {
271 free(cmdlines);
272 errno = ENOMEM;
273 return -1;
276 cmdlines[pevent->cmdline_count].pid = pid;
278 if (cmdlines[pevent->cmdline_count].comm)
279 pevent->cmdline_count++;
281 qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
282 pevent->cmdlines = cmdlines;
284 return 0;
288 * pevent_register_comm - register a pid / comm mapping
289 * @pevent: handle for the pevent
290 * @comm: the command line to register
291 * @pid: the pid to map the command line to
293 * This adds a mapping to search for command line names with
294 * a given pid. The comm is duplicated.
296 int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
298 struct cmdline_list *item;
300 if (pevent->cmdlines)
301 return add_new_comm(pevent, comm, pid);
303 item = malloc(sizeof(*item));
304 if (!item)
305 return -1;
307 if (comm)
308 item->comm = strdup(comm);
309 else
310 item->comm = strdup("<...>");
311 if (!item->comm) {
312 free(item);
313 return -1;
315 item->pid = pid;
316 item->next = pevent->cmdlist;
318 pevent->cmdlist = item;
319 pevent->cmdline_count++;
321 return 0;
324 int pevent_register_trace_clock(struct pevent *pevent, const char *trace_clock)
326 pevent->trace_clock = strdup(trace_clock);
327 if (!pevent->trace_clock) {
328 errno = ENOMEM;
329 return -1;
331 return 0;
334 struct func_map {
335 unsigned long long addr;
336 char *func;
337 char *mod;
340 struct func_list {
341 struct func_list *next;
342 unsigned long long addr;
343 char *func;
344 char *mod;
347 static int func_cmp(const void *a, const void *b)
349 const struct func_map *fa = a;
350 const struct func_map *fb = b;
352 if (fa->addr < fb->addr)
353 return -1;
354 if (fa->addr > fb->addr)
355 return 1;
357 return 0;
361 * We are searching for a record in between, not an exact
362 * match.
364 static int func_bcmp(const void *a, const void *b)
366 const struct func_map *fa = a;
367 const struct func_map *fb = b;
369 if ((fa->addr == fb->addr) ||
371 (fa->addr > fb->addr &&
372 fa->addr < (fb+1)->addr))
373 return 0;
375 if (fa->addr < fb->addr)
376 return -1;
378 return 1;
381 static int func_map_init(struct pevent *pevent)
383 struct func_list *funclist;
384 struct func_list *item;
385 struct func_map *func_map;
386 int i;
388 func_map = malloc(sizeof(*func_map) * (pevent->func_count + 1));
389 if (!func_map)
390 return -1;
392 funclist = pevent->funclist;
394 i = 0;
395 while (funclist) {
396 func_map[i].func = funclist->func;
397 func_map[i].addr = funclist->addr;
398 func_map[i].mod = funclist->mod;
399 i++;
400 item = funclist;
401 funclist = funclist->next;
402 free(item);
405 qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
408 * Add a special record at the end.
410 func_map[pevent->func_count].func = NULL;
411 func_map[pevent->func_count].addr = 0;
412 func_map[pevent->func_count].mod = NULL;
414 pevent->func_map = func_map;
415 pevent->funclist = NULL;
417 return 0;
420 static struct func_map *
421 __find_func(struct pevent *pevent, unsigned long long addr)
423 struct func_map *func;
424 struct func_map key;
426 if (!pevent->func_map)
427 func_map_init(pevent);
429 key.addr = addr;
431 func = bsearch(&key, pevent->func_map, pevent->func_count,
432 sizeof(*pevent->func_map), func_bcmp);
434 return func;
437 struct func_resolver {
438 pevent_func_resolver_t *func;
439 void *priv;
440 struct func_map map;
444 * pevent_set_function_resolver - set an alternative function resolver
445 * @pevent: handle for the pevent
446 * @resolver: function to be used
447 * @priv: resolver function private state.
449 * Some tools may have already a way to resolve kernel functions, allow them to
450 * keep using it instead of duplicating all the entries inside
451 * pevent->funclist.
453 int pevent_set_function_resolver(struct pevent *pevent,
454 pevent_func_resolver_t *func, void *priv)
456 struct func_resolver *resolver = malloc(sizeof(*resolver));
458 if (resolver == NULL)
459 return -1;
461 resolver->func = func;
462 resolver->priv = priv;
464 free(pevent->func_resolver);
465 pevent->func_resolver = resolver;
467 return 0;
471 * pevent_reset_function_resolver - reset alternative function resolver
472 * @pevent: handle for the pevent
474 * Stop using whatever alternative resolver was set, use the default
475 * one instead.
477 void pevent_reset_function_resolver(struct pevent *pevent)
479 free(pevent->func_resolver);
480 pevent->func_resolver = NULL;
483 static struct func_map *
484 find_func(struct pevent *pevent, unsigned long long addr)
486 struct func_map *map;
488 if (!pevent->func_resolver)
489 return __find_func(pevent, addr);
491 map = &pevent->func_resolver->map;
492 map->mod = NULL;
493 map->addr = addr;
494 map->func = pevent->func_resolver->func(pevent->func_resolver->priv,
495 &map->addr, &map->mod);
496 if (map->func == NULL)
497 return NULL;
499 return map;
503 * pevent_find_function - find a function by a given address
504 * @pevent: handle for the pevent
505 * @addr: the address to find the function with
507 * Returns a pointer to the function stored that has the given
508 * address. Note, the address does not have to be exact, it
509 * will select the function that would contain the address.
511 const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
513 struct func_map *map;
515 map = find_func(pevent, addr);
516 if (!map)
517 return NULL;
519 return map->func;
523 * pevent_find_function_address - find a function address by a given address
524 * @pevent: handle for the pevent
525 * @addr: the address to find the function with
527 * Returns the address the function starts at. This can be used in
528 * conjunction with pevent_find_function to print both the function
529 * name and the function offset.
531 unsigned long long
532 pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
534 struct func_map *map;
536 map = find_func(pevent, addr);
537 if (!map)
538 return 0;
540 return map->addr;
544 * pevent_register_function - register a function with a given address
545 * @pevent: handle for the pevent
546 * @function: the function name to register
547 * @addr: the address the function starts at
548 * @mod: the kernel module the function may be in (NULL for none)
550 * This registers a function name with an address and module.
551 * The @func passed in is duplicated.
553 int pevent_register_function(struct pevent *pevent, char *func,
554 unsigned long long addr, char *mod)
556 struct func_list *item = malloc(sizeof(*item));
558 if (!item)
559 return -1;
561 item->next = pevent->funclist;
562 item->func = strdup(func);
563 if (!item->func)
564 goto out_free;
566 if (mod) {
567 item->mod = strdup(mod);
568 if (!item->mod)
569 goto out_free_func;
570 } else
571 item->mod = NULL;
572 item->addr = addr;
574 pevent->funclist = item;
575 pevent->func_count++;
577 return 0;
579 out_free_func:
580 free(item->func);
581 item->func = NULL;
582 out_free:
583 free(item);
584 errno = ENOMEM;
585 return -1;
589 * pevent_print_funcs - print out the stored functions
590 * @pevent: handle for the pevent
592 * This prints out the stored functions.
594 void pevent_print_funcs(struct pevent *pevent)
596 int i;
598 if (!pevent->func_map)
599 func_map_init(pevent);
601 for (i = 0; i < (int)pevent->func_count; i++) {
602 printf("%016llx %s",
603 pevent->func_map[i].addr,
604 pevent->func_map[i].func);
605 if (pevent->func_map[i].mod)
606 printf(" [%s]\n", pevent->func_map[i].mod);
607 else
608 printf("\n");
612 struct printk_map {
613 unsigned long long addr;
614 char *printk;
617 struct printk_list {
618 struct printk_list *next;
619 unsigned long long addr;
620 char *printk;
623 static int printk_cmp(const void *a, const void *b)
625 const struct printk_map *pa = a;
626 const struct printk_map *pb = b;
628 if (pa->addr < pb->addr)
629 return -1;
630 if (pa->addr > pb->addr)
631 return 1;
633 return 0;
636 static int printk_map_init(struct pevent *pevent)
638 struct printk_list *printklist;
639 struct printk_list *item;
640 struct printk_map *printk_map;
641 int i;
643 printk_map = malloc(sizeof(*printk_map) * (pevent->printk_count + 1));
644 if (!printk_map)
645 return -1;
647 printklist = pevent->printklist;
649 i = 0;
650 while (printklist) {
651 printk_map[i].printk = printklist->printk;
652 printk_map[i].addr = printklist->addr;
653 i++;
654 item = printklist;
655 printklist = printklist->next;
656 free(item);
659 qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
661 pevent->printk_map = printk_map;
662 pevent->printklist = NULL;
664 return 0;
667 static struct printk_map *
668 find_printk(struct pevent *pevent, unsigned long long addr)
670 struct printk_map *printk;
671 struct printk_map key;
673 if (!pevent->printk_map && printk_map_init(pevent))
674 return NULL;
676 key.addr = addr;
678 printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
679 sizeof(*pevent->printk_map), printk_cmp);
681 return printk;
685 * pevent_register_print_string - register a string by its address
686 * @pevent: handle for the pevent
687 * @fmt: the string format to register
688 * @addr: the address the string was located at
690 * This registers a string by the address it was stored in the kernel.
691 * The @fmt passed in is duplicated.
693 int pevent_register_print_string(struct pevent *pevent, const char *fmt,
694 unsigned long long addr)
696 struct printk_list *item = malloc(sizeof(*item));
697 char *p;
699 if (!item)
700 return -1;
702 item->next = pevent->printklist;
703 item->addr = addr;
705 /* Strip off quotes and '\n' from the end */
706 if (fmt[0] == '"')
707 fmt++;
708 item->printk = strdup(fmt);
709 if (!item->printk)
710 goto out_free;
712 p = item->printk + strlen(item->printk) - 1;
713 if (*p == '"')
714 *p = 0;
716 p -= 2;
717 if (strcmp(p, "\\n") == 0)
718 *p = 0;
720 pevent->printklist = item;
721 pevent->printk_count++;
723 return 0;
725 out_free:
726 free(item);
727 errno = ENOMEM;
728 return -1;
732 * pevent_print_printk - print out the stored strings
733 * @pevent: handle for the pevent
735 * This prints the string formats that were stored.
737 void pevent_print_printk(struct pevent *pevent)
739 int i;
741 if (!pevent->printk_map)
742 printk_map_init(pevent);
744 for (i = 0; i < (int)pevent->printk_count; i++) {
745 printf("%016llx %s\n",
746 pevent->printk_map[i].addr,
747 pevent->printk_map[i].printk);
751 static struct event_format *alloc_event(void)
753 return calloc(1, sizeof(struct event_format));
756 static int add_event(struct pevent *pevent, struct event_format *event)
758 int i;
759 struct event_format **events = realloc(pevent->events, sizeof(event) *
760 (pevent->nr_events + 1));
761 if (!events)
762 return -1;
764 pevent->events = events;
766 for (i = 0; i < pevent->nr_events; i++) {
767 if (pevent->events[i]->id > event->id)
768 break;
770 if (i < pevent->nr_events)
771 memmove(&pevent->events[i + 1],
772 &pevent->events[i],
773 sizeof(event) * (pevent->nr_events - i));
775 pevent->events[i] = event;
776 pevent->nr_events++;
778 event->pevent = pevent;
780 return 0;
783 static int event_item_type(enum event_type type)
785 switch (type) {
786 case EVENT_ITEM ... EVENT_SQUOTE:
787 return 1;
788 case EVENT_ERROR ... EVENT_DELIM:
789 default:
790 return 0;
794 static void free_flag_sym(struct print_flag_sym *fsym)
796 struct print_flag_sym *next;
798 while (fsym) {
799 next = fsym->next;
800 free(fsym->value);
801 free(fsym->str);
802 free(fsym);
803 fsym = next;
807 static void free_arg(struct print_arg *arg)
809 struct print_arg *farg;
811 if (!arg)
812 return;
814 switch (arg->type) {
815 case PRINT_ATOM:
816 free(arg->atom.atom);
817 break;
818 case PRINT_FIELD:
819 free(arg->field.name);
820 break;
821 case PRINT_FLAGS:
822 free_arg(arg->flags.field);
823 free(arg->flags.delim);
824 free_flag_sym(arg->flags.flags);
825 break;
826 case PRINT_SYMBOL:
827 free_arg(arg->symbol.field);
828 free_flag_sym(arg->symbol.symbols);
829 break;
830 case PRINT_HEX:
831 free_arg(arg->hex.field);
832 free_arg(arg->hex.size);
833 break;
834 case PRINT_INT_ARRAY:
835 free_arg(arg->int_array.field);
836 free_arg(arg->int_array.count);
837 free_arg(arg->int_array.el_size);
838 break;
839 case PRINT_TYPE:
840 free(arg->typecast.type);
841 free_arg(arg->typecast.item);
842 break;
843 case PRINT_STRING:
844 case PRINT_BSTRING:
845 free(arg->string.string);
846 break;
847 case PRINT_BITMASK:
848 free(arg->bitmask.bitmask);
849 break;
850 case PRINT_DYNAMIC_ARRAY:
851 case PRINT_DYNAMIC_ARRAY_LEN:
852 free(arg->dynarray.index);
853 break;
854 case PRINT_OP:
855 free(arg->op.op);
856 free_arg(arg->op.left);
857 free_arg(arg->op.right);
858 break;
859 case PRINT_FUNC:
860 while (arg->func.args) {
861 farg = arg->func.args;
862 arg->func.args = farg->next;
863 free_arg(farg);
865 break;
867 case PRINT_NULL:
868 default:
869 break;
872 free(arg);
875 static enum event_type get_type(int ch)
877 if (ch == '\n')
878 return EVENT_NEWLINE;
879 if (isspace(ch))
880 return EVENT_SPACE;
881 if (isalnum(ch) || ch == '_')
882 return EVENT_ITEM;
883 if (ch == '\'')
884 return EVENT_SQUOTE;
885 if (ch == '"')
886 return EVENT_DQUOTE;
887 if (!isprint(ch))
888 return EVENT_NONE;
889 if (ch == '(' || ch == ')' || ch == ',')
890 return EVENT_DELIM;
892 return EVENT_OP;
895 static int __read_char(void)
897 if (input_buf_ptr >= input_buf_siz)
898 return -1;
900 return input_buf[input_buf_ptr++];
903 static int __peek_char(void)
905 if (input_buf_ptr >= input_buf_siz)
906 return -1;
908 return input_buf[input_buf_ptr];
912 * pevent_peek_char - peek at the next character that will be read
914 * Returns the next character read, or -1 if end of buffer.
916 int pevent_peek_char(void)
918 return __peek_char();
921 static int extend_token(char **tok, char *buf, int size)
923 char *newtok = realloc(*tok, size);
925 if (!newtok) {
926 free(*tok);
927 *tok = NULL;
928 return -1;
931 if (!*tok)
932 strcpy(newtok, buf);
933 else
934 strcat(newtok, buf);
935 *tok = newtok;
937 return 0;
940 static enum event_type force_token(const char *str, char **tok);
942 static enum event_type __read_token(char **tok)
944 char buf[BUFSIZ];
945 int ch, last_ch, quote_ch, next_ch;
946 int i = 0;
947 int tok_size = 0;
948 enum event_type type;
950 *tok = NULL;
953 ch = __read_char();
954 if (ch < 0)
955 return EVENT_NONE;
957 type = get_type(ch);
958 if (type == EVENT_NONE)
959 return type;
961 buf[i++] = ch;
963 switch (type) {
964 case EVENT_NEWLINE:
965 case EVENT_DELIM:
966 if (asprintf(tok, "%c", ch) < 0)
967 return EVENT_ERROR;
969 return type;
971 case EVENT_OP:
972 switch (ch) {
973 case '-':
974 next_ch = __peek_char();
975 if (next_ch == '>') {
976 buf[i++] = __read_char();
977 break;
979 /* fall through */
980 case '+':
981 case '|':
982 case '&':
983 case '>':
984 case '<':
985 last_ch = ch;
986 ch = __peek_char();
987 if (ch != last_ch)
988 goto test_equal;
989 buf[i++] = __read_char();
990 switch (last_ch) {
991 case '>':
992 case '<':
993 goto test_equal;
994 default:
995 break;
997 break;
998 case '!':
999 case '=':
1000 goto test_equal;
1001 default: /* what should we do instead? */
1002 break;
1004 buf[i] = 0;
1005 *tok = strdup(buf);
1006 return type;
1008 test_equal:
1009 ch = __peek_char();
1010 if (ch == '=')
1011 buf[i++] = __read_char();
1012 goto out;
1014 case EVENT_DQUOTE:
1015 case EVENT_SQUOTE:
1016 /* don't keep quotes */
1017 i--;
1018 quote_ch = ch;
1019 last_ch = 0;
1020 concat:
1021 do {
1022 if (i == (BUFSIZ - 1)) {
1023 buf[i] = 0;
1024 tok_size += BUFSIZ;
1026 if (extend_token(tok, buf, tok_size) < 0)
1027 return EVENT_NONE;
1028 i = 0;
1030 last_ch = ch;
1031 ch = __read_char();
1032 buf[i++] = ch;
1033 /* the '\' '\' will cancel itself */
1034 if (ch == '\\' && last_ch == '\\')
1035 last_ch = 0;
1036 } while (ch != quote_ch || last_ch == '\\');
1037 /* remove the last quote */
1038 i--;
1041 * For strings (double quotes) check the next token.
1042 * If it is another string, concatinate the two.
1044 if (type == EVENT_DQUOTE) {
1045 unsigned long long save_input_buf_ptr = input_buf_ptr;
1047 do {
1048 ch = __read_char();
1049 } while (isspace(ch));
1050 if (ch == '"')
1051 goto concat;
1052 input_buf_ptr = save_input_buf_ptr;
1055 goto out;
1057 case EVENT_ERROR ... EVENT_SPACE:
1058 case EVENT_ITEM:
1059 default:
1060 break;
1063 while (get_type(__peek_char()) == type) {
1064 if (i == (BUFSIZ - 1)) {
1065 buf[i] = 0;
1066 tok_size += BUFSIZ;
1068 if (extend_token(tok, buf, tok_size) < 0)
1069 return EVENT_NONE;
1070 i = 0;
1072 ch = __read_char();
1073 buf[i++] = ch;
1076 out:
1077 buf[i] = 0;
1078 if (extend_token(tok, buf, tok_size + i + 1) < 0)
1079 return EVENT_NONE;
1081 if (type == EVENT_ITEM) {
1083 * Older versions of the kernel has a bug that
1084 * creates invalid symbols and will break the mac80211
1085 * parsing. This is a work around to that bug.
1087 * See Linux kernel commit:
1088 * 811cb50baf63461ce0bdb234927046131fc7fa8b
1090 if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
1091 free(*tok);
1092 *tok = NULL;
1093 return force_token("\"\%s\" ", tok);
1094 } else if (strcmp(*tok, "STA_PR_FMT") == 0) {
1095 free(*tok);
1096 *tok = NULL;
1097 return force_token("\" sta:%pM\" ", tok);
1098 } else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
1099 free(*tok);
1100 *tok = NULL;
1101 return force_token("\" vif:%p(%d)\" ", tok);
1105 return type;
1108 static enum event_type force_token(const char *str, char **tok)
1110 const char *save_input_buf;
1111 unsigned long long save_input_buf_ptr;
1112 unsigned long long save_input_buf_siz;
1113 enum event_type type;
1115 /* save off the current input pointers */
1116 save_input_buf = input_buf;
1117 save_input_buf_ptr = input_buf_ptr;
1118 save_input_buf_siz = input_buf_siz;
1120 init_input_buf(str, strlen(str));
1122 type = __read_token(tok);
1124 /* reset back to original token */
1125 input_buf = save_input_buf;
1126 input_buf_ptr = save_input_buf_ptr;
1127 input_buf_siz = save_input_buf_siz;
1129 return type;
1132 static void free_token(char *tok)
1134 if (tok)
1135 free(tok);
1138 static enum event_type read_token(char **tok)
1140 enum event_type type;
1142 for (;;) {
1143 type = __read_token(tok);
1144 if (type != EVENT_SPACE)
1145 return type;
1147 free_token(*tok);
1150 /* not reached */
1151 *tok = NULL;
1152 return EVENT_NONE;
1156 * pevent_read_token - access to utilites to use the pevent parser
1157 * @tok: The token to return
1159 * This will parse tokens from the string given by
1160 * pevent_init_data().
1162 * Returns the token type.
1164 enum event_type pevent_read_token(char **tok)
1166 return read_token(tok);
1170 * pevent_free_token - free a token returned by pevent_read_token
1171 * @token: the token to free
1173 void pevent_free_token(char *token)
1175 free_token(token);
1178 /* no newline */
1179 static enum event_type read_token_item(char **tok)
1181 enum event_type type;
1183 for (;;) {
1184 type = __read_token(tok);
1185 if (type != EVENT_SPACE && type != EVENT_NEWLINE)
1186 return type;
1187 free_token(*tok);
1188 *tok = NULL;
1191 /* not reached */
1192 *tok = NULL;
1193 return EVENT_NONE;
1196 static int test_type(enum event_type type, enum event_type expect)
1198 if (type != expect) {
1199 do_warning("Error: expected type %d but read %d",
1200 expect, type);
1201 return -1;
1203 return 0;
1206 static int test_type_token(enum event_type type, const char *token,
1207 enum event_type expect, const char *expect_tok)
1209 if (type != expect) {
1210 do_warning("Error: expected type %d but read %d",
1211 expect, type);
1212 return -1;
1215 if (strcmp(token, expect_tok) != 0) {
1216 do_warning("Error: expected '%s' but read '%s'",
1217 expect_tok, token);
1218 return -1;
1220 return 0;
1223 static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
1225 enum event_type type;
1227 if (newline_ok)
1228 type = read_token(tok);
1229 else
1230 type = read_token_item(tok);
1231 return test_type(type, expect);
1234 static int read_expect_type(enum event_type expect, char **tok)
1236 return __read_expect_type(expect, tok, 1);
1239 static int __read_expected(enum event_type expect, const char *str,
1240 int newline_ok)
1242 enum event_type type;
1243 char *token;
1244 int ret;
1246 if (newline_ok)
1247 type = read_token(&token);
1248 else
1249 type = read_token_item(&token);
1251 ret = test_type_token(type, token, expect, str);
1253 free_token(token);
1255 return ret;
1258 static int read_expected(enum event_type expect, const char *str)
1260 return __read_expected(expect, str, 1);
1263 static int read_expected_item(enum event_type expect, const char *str)
1265 return __read_expected(expect, str, 0);
1268 static char *event_read_name(void)
1270 char *token;
1272 if (read_expected(EVENT_ITEM, "name") < 0)
1273 return NULL;
1275 if (read_expected(EVENT_OP, ":") < 0)
1276 return NULL;
1278 if (read_expect_type(EVENT_ITEM, &token) < 0)
1279 goto fail;
1281 return token;
1283 fail:
1284 free_token(token);
1285 return NULL;
1288 static int event_read_id(void)
1290 char *token;
1291 int id;
1293 if (read_expected_item(EVENT_ITEM, "ID") < 0)
1294 return -1;
1296 if (read_expected(EVENT_OP, ":") < 0)
1297 return -1;
1299 if (read_expect_type(EVENT_ITEM, &token) < 0)
1300 goto fail;
1302 id = strtoul(token, NULL, 0);
1303 free_token(token);
1304 return id;
1306 fail:
1307 free_token(token);
1308 return -1;
1311 static int field_is_string(struct format_field *field)
1313 if ((field->flags & FIELD_IS_ARRAY) &&
1314 (strstr(field->type, "char") || strstr(field->type, "u8") ||
1315 strstr(field->type, "s8")))
1316 return 1;
1318 return 0;
1321 static int field_is_dynamic(struct format_field *field)
1323 if (strncmp(field->type, "__data_loc", 10) == 0)
1324 return 1;
1326 return 0;
1329 static int field_is_long(struct format_field *field)
1331 /* includes long long */
1332 if (strstr(field->type, "long"))
1333 return 1;
1335 return 0;
1338 static unsigned int type_size(const char *name)
1340 /* This covers all FIELD_IS_STRING types. */
1341 static struct {
1342 const char *type;
1343 unsigned int size;
1344 } table[] = {
1345 { "u8", 1 },
1346 { "u16", 2 },
1347 { "u32", 4 },
1348 { "u64", 8 },
1349 { "s8", 1 },
1350 { "s16", 2 },
1351 { "s32", 4 },
1352 { "s64", 8 },
1353 { "char", 1 },
1354 { },
1356 int i;
1358 for (i = 0; table[i].type; i++) {
1359 if (!strcmp(table[i].type, name))
1360 return table[i].size;
1363 return 0;
1366 static int event_read_fields(struct event_format *event, struct format_field **fields)
1368 struct format_field *field = NULL;
1369 enum event_type type;
1370 char *token;
1371 char *last_token;
1372 int count = 0;
1374 do {
1375 unsigned int size_dynamic = 0;
1377 type = read_token(&token);
1378 if (type == EVENT_NEWLINE) {
1379 free_token(token);
1380 return count;
1383 count++;
1385 if (test_type_token(type, token, EVENT_ITEM, "field"))
1386 goto fail;
1387 free_token(token);
1389 type = read_token(&token);
1391 * The ftrace fields may still use the "special" name.
1392 * Just ignore it.
1394 if (event->flags & EVENT_FL_ISFTRACE &&
1395 type == EVENT_ITEM && strcmp(token, "special") == 0) {
1396 free_token(token);
1397 type = read_token(&token);
1400 if (test_type_token(type, token, EVENT_OP, ":") < 0)
1401 goto fail;
1403 free_token(token);
1404 if (read_expect_type(EVENT_ITEM, &token) < 0)
1405 goto fail;
1407 last_token = token;
1409 field = calloc(1, sizeof(*field));
1410 if (!field)
1411 goto fail;
1413 field->event = event;
1415 /* read the rest of the type */
1416 for (;;) {
1417 type = read_token(&token);
1418 if (type == EVENT_ITEM ||
1419 (type == EVENT_OP && strcmp(token, "*") == 0) ||
1421 * Some of the ftrace fields are broken and have
1422 * an illegal "." in them.
1424 (event->flags & EVENT_FL_ISFTRACE &&
1425 type == EVENT_OP && strcmp(token, ".") == 0)) {
1427 if (strcmp(token, "*") == 0)
1428 field->flags |= FIELD_IS_POINTER;
1430 if (field->type) {
1431 char *new_type;
1432 new_type = realloc(field->type,
1433 strlen(field->type) +
1434 strlen(last_token) + 2);
1435 if (!new_type) {
1436 free(last_token);
1437 goto fail;
1439 field->type = new_type;
1440 strcat(field->type, " ");
1441 strcat(field->type, last_token);
1442 free(last_token);
1443 } else
1444 field->type = last_token;
1445 last_token = token;
1446 continue;
1449 break;
1452 if (!field->type) {
1453 do_warning_event(event, "%s: no type found", __func__);
1454 goto fail;
1456 field->name = field->alias = last_token;
1458 if (test_type(type, EVENT_OP))
1459 goto fail;
1461 if (strcmp(token, "[") == 0) {
1462 enum event_type last_type = type;
1463 char *brackets = token;
1464 char *new_brackets;
1465 int len;
1467 field->flags |= FIELD_IS_ARRAY;
1469 type = read_token(&token);
1471 if (type == EVENT_ITEM)
1472 field->arraylen = strtoul(token, NULL, 0);
1473 else
1474 field->arraylen = 0;
1476 while (strcmp(token, "]") != 0) {
1477 if (last_type == EVENT_ITEM &&
1478 type == EVENT_ITEM)
1479 len = 2;
1480 else
1481 len = 1;
1482 last_type = type;
1484 new_brackets = realloc(brackets,
1485 strlen(brackets) +
1486 strlen(token) + len);
1487 if (!new_brackets) {
1488 free(brackets);
1489 goto fail;
1491 brackets = new_brackets;
1492 if (len == 2)
1493 strcat(brackets, " ");
1494 strcat(brackets, token);
1495 /* We only care about the last token */
1496 field->arraylen = strtoul(token, NULL, 0);
1497 free_token(token);
1498 type = read_token(&token);
1499 if (type == EVENT_NONE) {
1500 do_warning_event(event, "failed to find token");
1501 goto fail;
1505 free_token(token);
1507 new_brackets = realloc(brackets, strlen(brackets) + 2);
1508 if (!new_brackets) {
1509 free(brackets);
1510 goto fail;
1512 brackets = new_brackets;
1513 strcat(brackets, "]");
1515 /* add brackets to type */
1517 type = read_token(&token);
1519 * If the next token is not an OP, then it is of
1520 * the format: type [] item;
1522 if (type == EVENT_ITEM) {
1523 char *new_type;
1524 new_type = realloc(field->type,
1525 strlen(field->type) +
1526 strlen(field->name) +
1527 strlen(brackets) + 2);
1528 if (!new_type) {
1529 free(brackets);
1530 goto fail;
1532 field->type = new_type;
1533 strcat(field->type, " ");
1534 strcat(field->type, field->name);
1535 size_dynamic = type_size(field->name);
1536 free_token(field->name);
1537 strcat(field->type, brackets);
1538 field->name = field->alias = token;
1539 type = read_token(&token);
1540 } else {
1541 char *new_type;
1542 new_type = realloc(field->type,
1543 strlen(field->type) +
1544 strlen(brackets) + 1);
1545 if (!new_type) {
1546 free(brackets);
1547 goto fail;
1549 field->type = new_type;
1550 strcat(field->type, brackets);
1552 free(brackets);
1555 if (field_is_string(field))
1556 field->flags |= FIELD_IS_STRING;
1557 if (field_is_dynamic(field))
1558 field->flags |= FIELD_IS_DYNAMIC;
1559 if (field_is_long(field))
1560 field->flags |= FIELD_IS_LONG;
1562 if (test_type_token(type, token, EVENT_OP, ";"))
1563 goto fail;
1564 free_token(token);
1566 if (read_expected(EVENT_ITEM, "offset") < 0)
1567 goto fail_expect;
1569 if (read_expected(EVENT_OP, ":") < 0)
1570 goto fail_expect;
1572 if (read_expect_type(EVENT_ITEM, &token))
1573 goto fail;
1574 field->offset = strtoul(token, NULL, 0);
1575 free_token(token);
1577 if (read_expected(EVENT_OP, ";") < 0)
1578 goto fail_expect;
1580 if (read_expected(EVENT_ITEM, "size") < 0)
1581 goto fail_expect;
1583 if (read_expected(EVENT_OP, ":") < 0)
1584 goto fail_expect;
1586 if (read_expect_type(EVENT_ITEM, &token))
1587 goto fail;
1588 field->size = strtoul(token, NULL, 0);
1589 free_token(token);
1591 if (read_expected(EVENT_OP, ";") < 0)
1592 goto fail_expect;
1594 type = read_token(&token);
1595 if (type != EVENT_NEWLINE) {
1596 /* newer versions of the kernel have a "signed" type */
1597 if (test_type_token(type, token, EVENT_ITEM, "signed"))
1598 goto fail;
1600 free_token(token);
1602 if (read_expected(EVENT_OP, ":") < 0)
1603 goto fail_expect;
1605 if (read_expect_type(EVENT_ITEM, &token))
1606 goto fail;
1608 if (strtoul(token, NULL, 0))
1609 field->flags |= FIELD_IS_SIGNED;
1611 free_token(token);
1612 if (read_expected(EVENT_OP, ";") < 0)
1613 goto fail_expect;
1615 if (read_expect_type(EVENT_NEWLINE, &token))
1616 goto fail;
1619 free_token(token);
1621 if (field->flags & FIELD_IS_ARRAY) {
1622 if (field->arraylen)
1623 field->elementsize = field->size / field->arraylen;
1624 else if (field->flags & FIELD_IS_DYNAMIC)
1625 field->elementsize = size_dynamic;
1626 else if (field->flags & FIELD_IS_STRING)
1627 field->elementsize = 1;
1628 else if (field->flags & FIELD_IS_LONG)
1629 field->elementsize = event->pevent ?
1630 event->pevent->long_size :
1631 sizeof(long);
1632 } else
1633 field->elementsize = field->size;
1635 *fields = field;
1636 fields = &field->next;
1638 } while (1);
1640 return 0;
1642 fail:
1643 free_token(token);
1644 fail_expect:
1645 if (field) {
1646 free(field->type);
1647 free(field->name);
1648 free(field);
1650 return -1;
1653 static int event_read_format(struct event_format *event)
1655 char *token;
1656 int ret;
1658 if (read_expected_item(EVENT_ITEM, "format") < 0)
1659 return -1;
1661 if (read_expected(EVENT_OP, ":") < 0)
1662 return -1;
1664 if (read_expect_type(EVENT_NEWLINE, &token))
1665 goto fail;
1666 free_token(token);
1668 ret = event_read_fields(event, &event->format.common_fields);
1669 if (ret < 0)
1670 return ret;
1671 event->format.nr_common = ret;
1673 ret = event_read_fields(event, &event->format.fields);
1674 if (ret < 0)
1675 return ret;
1676 event->format.nr_fields = ret;
1678 return 0;
1680 fail:
1681 free_token(token);
1682 return -1;
1685 static enum event_type
1686 process_arg_token(struct event_format *event, struct print_arg *arg,
1687 char **tok, enum event_type type);
1689 static enum event_type
1690 process_arg(struct event_format *event, struct print_arg *arg, char **tok)
1692 enum event_type type;
1693 char *token;
1695 type = read_token(&token);
1696 *tok = token;
1698 return process_arg_token(event, arg, tok, type);
1701 static enum event_type
1702 process_op(struct event_format *event, struct print_arg *arg, char **tok);
1705 * For __print_symbolic() and __print_flags, we need to completely
1706 * evaluate the first argument, which defines what to print next.
1708 static enum event_type
1709 process_field_arg(struct event_format *event, struct print_arg *arg, char **tok)
1711 enum event_type type;
1713 type = process_arg(event, arg, tok);
1715 while (type == EVENT_OP) {
1716 type = process_op(event, arg, tok);
1719 return type;
1722 static enum event_type
1723 process_cond(struct event_format *event, struct print_arg *top, char **tok)
1725 struct print_arg *arg, *left, *right;
1726 enum event_type type;
1727 char *token = NULL;
1729 arg = alloc_arg();
1730 left = alloc_arg();
1731 right = alloc_arg();
1733 if (!arg || !left || !right) {
1734 do_warning_event(event, "%s: not enough memory!", __func__);
1735 /* arg will be freed at out_free */
1736 free_arg(left);
1737 free_arg(right);
1738 goto out_free;
1741 arg->type = PRINT_OP;
1742 arg->op.left = left;
1743 arg->op.right = right;
1745 *tok = NULL;
1746 type = process_arg(event, left, &token);
1748 again:
1749 if (type == EVENT_ERROR)
1750 goto out_free;
1752 /* Handle other operations in the arguments */
1753 if (type == EVENT_OP && strcmp(token, ":") != 0) {
1754 type = process_op(event, left, &token);
1755 goto again;
1758 if (test_type_token(type, token, EVENT_OP, ":"))
1759 goto out_free;
1761 arg->op.op = token;
1763 type = process_arg(event, right, &token);
1765 top->op.right = arg;
1767 *tok = token;
1768 return type;
1770 out_free:
1771 /* Top may point to itself */
1772 top->op.right = NULL;
1773 free_token(token);
1774 free_arg(arg);
1775 return EVENT_ERROR;
1778 static enum event_type
1779 process_array(struct event_format *event, struct print_arg *top, char **tok)
1781 struct print_arg *arg;
1782 enum event_type type;
1783 char *token = NULL;
1785 arg = alloc_arg();
1786 if (!arg) {
1787 do_warning_event(event, "%s: not enough memory!", __func__);
1788 /* '*tok' is set to top->op.op. No need to free. */
1789 *tok = NULL;
1790 return EVENT_ERROR;
1793 *tok = NULL;
1794 type = process_arg(event, arg, &token);
1795 if (test_type_token(type, token, EVENT_OP, "]"))
1796 goto out_free;
1798 top->op.right = arg;
1800 free_token(token);
1801 type = read_token_item(&token);
1802 *tok = token;
1804 return type;
1806 out_free:
1807 free_token(token);
1808 free_arg(arg);
1809 return EVENT_ERROR;
1812 static int get_op_prio(char *op)
1814 if (!op[1]) {
1815 switch (op[0]) {
1816 case '~':
1817 case '!':
1818 return 4;
1819 case '*':
1820 case '/':
1821 case '%':
1822 return 6;
1823 case '+':
1824 case '-':
1825 return 7;
1826 /* '>>' and '<<' are 8 */
1827 case '<':
1828 case '>':
1829 return 9;
1830 /* '==' and '!=' are 10 */
1831 case '&':
1832 return 11;
1833 case '^':
1834 return 12;
1835 case '|':
1836 return 13;
1837 case '?':
1838 return 16;
1839 default:
1840 do_warning("unknown op '%c'", op[0]);
1841 return -1;
1843 } else {
1844 if (strcmp(op, "++") == 0 ||
1845 strcmp(op, "--") == 0) {
1846 return 3;
1847 } else if (strcmp(op, ">>") == 0 ||
1848 strcmp(op, "<<") == 0) {
1849 return 8;
1850 } else if (strcmp(op, ">=") == 0 ||
1851 strcmp(op, "<=") == 0) {
1852 return 9;
1853 } else if (strcmp(op, "==") == 0 ||
1854 strcmp(op, "!=") == 0) {
1855 return 10;
1856 } else if (strcmp(op, "&&") == 0) {
1857 return 14;
1858 } else if (strcmp(op, "||") == 0) {
1859 return 15;
1860 } else {
1861 do_warning("unknown op '%s'", op);
1862 return -1;
1867 static int set_op_prio(struct print_arg *arg)
1870 /* single ops are the greatest */
1871 if (!arg->op.left || arg->op.left->type == PRINT_NULL)
1872 arg->op.prio = 0;
1873 else
1874 arg->op.prio = get_op_prio(arg->op.op);
1876 return arg->op.prio;
1879 /* Note, *tok does not get freed, but will most likely be saved */
1880 static enum event_type
1881 process_op(struct event_format *event, struct print_arg *arg, char **tok)
1883 struct print_arg *left, *right = NULL;
1884 enum event_type type;
1885 char *token;
1887 /* the op is passed in via tok */
1888 token = *tok;
1890 if (arg->type == PRINT_OP && !arg->op.left) {
1891 /* handle single op */
1892 if (token[1]) {
1893 do_warning_event(event, "bad op token %s", token);
1894 goto out_free;
1896 switch (token[0]) {
1897 case '~':
1898 case '!':
1899 case '+':
1900 case '-':
1901 break;
1902 default:
1903 do_warning_event(event, "bad op token %s", token);
1904 goto out_free;
1908 /* make an empty left */
1909 left = alloc_arg();
1910 if (!left)
1911 goto out_warn_free;
1913 left->type = PRINT_NULL;
1914 arg->op.left = left;
1916 right = alloc_arg();
1917 if (!right)
1918 goto out_warn_free;
1920 arg->op.right = right;
1922 /* do not free the token, it belongs to an op */
1923 *tok = NULL;
1924 type = process_arg(event, right, tok);
1926 } else if (strcmp(token, "?") == 0) {
1928 left = alloc_arg();
1929 if (!left)
1930 goto out_warn_free;
1932 /* copy the top arg to the left */
1933 *left = *arg;
1935 arg->type = PRINT_OP;
1936 arg->op.op = token;
1937 arg->op.left = left;
1938 arg->op.prio = 0;
1940 /* it will set arg->op.right */
1941 type = process_cond(event, arg, tok);
1943 } else if (strcmp(token, ">>") == 0 ||
1944 strcmp(token, "<<") == 0 ||
1945 strcmp(token, "&") == 0 ||
1946 strcmp(token, "|") == 0 ||
1947 strcmp(token, "&&") == 0 ||
1948 strcmp(token, "||") == 0 ||
1949 strcmp(token, "-") == 0 ||
1950 strcmp(token, "+") == 0 ||
1951 strcmp(token, "*") == 0 ||
1952 strcmp(token, "^") == 0 ||
1953 strcmp(token, "/") == 0 ||
1954 strcmp(token, "%") == 0 ||
1955 strcmp(token, "<") == 0 ||
1956 strcmp(token, ">") == 0 ||
1957 strcmp(token, "<=") == 0 ||
1958 strcmp(token, ">=") == 0 ||
1959 strcmp(token, "==") == 0 ||
1960 strcmp(token, "!=") == 0) {
1962 left = alloc_arg();
1963 if (!left)
1964 goto out_warn_free;
1966 /* copy the top arg to the left */
1967 *left = *arg;
1969 arg->type = PRINT_OP;
1970 arg->op.op = token;
1971 arg->op.left = left;
1972 arg->op.right = NULL;
1974 if (set_op_prio(arg) == -1) {
1975 event->flags |= EVENT_FL_FAILED;
1976 /* arg->op.op (= token) will be freed at out_free */
1977 arg->op.op = NULL;
1978 goto out_free;
1981 type = read_token_item(&token);
1982 *tok = token;
1984 /* could just be a type pointer */
1985 if ((strcmp(arg->op.op, "*") == 0) &&
1986 type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1987 char *new_atom;
1989 if (left->type != PRINT_ATOM) {
1990 do_warning_event(event, "bad pointer type");
1991 goto out_free;
1993 new_atom = realloc(left->atom.atom,
1994 strlen(left->atom.atom) + 3);
1995 if (!new_atom)
1996 goto out_warn_free;
1998 left->atom.atom = new_atom;
1999 strcat(left->atom.atom, " *");
2000 free(arg->op.op);
2001 *arg = *left;
2002 free(left);
2004 return type;
2007 right = alloc_arg();
2008 if (!right)
2009 goto out_warn_free;
2011 type = process_arg_token(event, right, tok, type);
2012 if (type == EVENT_ERROR) {
2013 free_arg(right);
2014 /* token was freed in process_arg_token() via *tok */
2015 token = NULL;
2016 goto out_free;
2019 if (right->type == PRINT_OP &&
2020 get_op_prio(arg->op.op) < get_op_prio(right->op.op)) {
2021 struct print_arg tmp;
2023 /* rotate ops according to the priority */
2024 arg->op.right = right->op.left;
2026 tmp = *arg;
2027 *arg = *right;
2028 *right = tmp;
2030 arg->op.left = right;
2031 } else {
2032 arg->op.right = right;
2035 } else if (strcmp(token, "[") == 0) {
2037 left = alloc_arg();
2038 if (!left)
2039 goto out_warn_free;
2041 *left = *arg;
2043 arg->type = PRINT_OP;
2044 arg->op.op = token;
2045 arg->op.left = left;
2047 arg->op.prio = 0;
2049 /* it will set arg->op.right */
2050 type = process_array(event, arg, tok);
2052 } else {
2053 do_warning_event(event, "unknown op '%s'", token);
2054 event->flags |= EVENT_FL_FAILED;
2055 /* the arg is now the left side */
2056 goto out_free;
2059 if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
2060 int prio;
2062 /* higher prios need to be closer to the root */
2063 prio = get_op_prio(*tok);
2065 if (prio > arg->op.prio)
2066 return process_op(event, arg, tok);
2068 return process_op(event, right, tok);
2071 return type;
2073 out_warn_free:
2074 do_warning_event(event, "%s: not enough memory!", __func__);
2075 out_free:
2076 free_token(token);
2077 *tok = NULL;
2078 return EVENT_ERROR;
2081 static enum event_type
2082 process_entry(struct event_format *event __maybe_unused, struct print_arg *arg,
2083 char **tok)
2085 enum event_type type;
2086 char *field;
2087 char *token;
2089 if (read_expected(EVENT_OP, "->") < 0)
2090 goto out_err;
2092 if (read_expect_type(EVENT_ITEM, &token) < 0)
2093 goto out_free;
2094 field = token;
2096 arg->type = PRINT_FIELD;
2097 arg->field.name = field;
2099 if (is_flag_field) {
2100 arg->field.field = pevent_find_any_field(event, arg->field.name);
2101 arg->field.field->flags |= FIELD_IS_FLAG;
2102 is_flag_field = 0;
2103 } else if (is_symbolic_field) {
2104 arg->field.field = pevent_find_any_field(event, arg->field.name);
2105 arg->field.field->flags |= FIELD_IS_SYMBOLIC;
2106 is_symbolic_field = 0;
2109 type = read_token(&token);
2110 *tok = token;
2112 return type;
2114 out_free:
2115 free_token(token);
2116 out_err:
2117 *tok = NULL;
2118 return EVENT_ERROR;
2121 static int alloc_and_process_delim(struct event_format *event, char *next_token,
2122 struct print_arg **print_arg)
2124 struct print_arg *field;
2125 enum event_type type;
2126 char *token;
2127 int ret = 0;
2129 field = alloc_arg();
2130 if (!field) {
2131 do_warning_event(event, "%s: not enough memory!", __func__);
2132 errno = ENOMEM;
2133 return -1;
2136 type = process_arg(event, field, &token);
2138 if (test_type_token(type, token, EVENT_DELIM, next_token)) {
2139 errno = EINVAL;
2140 ret = -1;
2141 free_arg(field);
2142 goto out_free_token;
2145 *print_arg = field;
2147 out_free_token:
2148 free_token(token);
2150 return ret;
2153 static char *arg_eval (struct print_arg *arg);
2155 static unsigned long long
2156 eval_type_str(unsigned long long val, const char *type, int pointer)
2158 int sign = 0;
2159 char *ref;
2160 int len;
2162 len = strlen(type);
2164 if (pointer) {
2166 if (type[len-1] != '*') {
2167 do_warning("pointer expected with non pointer type");
2168 return val;
2171 ref = malloc(len);
2172 if (!ref) {
2173 do_warning("%s: not enough memory!", __func__);
2174 return val;
2176 memcpy(ref, type, len);
2178 /* chop off the " *" */
2179 ref[len - 2] = 0;
2181 val = eval_type_str(val, ref, 0);
2182 free(ref);
2183 return val;
2186 /* check if this is a pointer */
2187 if (type[len - 1] == '*')
2188 return val;
2190 /* Try to figure out the arg size*/
2191 if (strncmp(type, "struct", 6) == 0)
2192 /* all bets off */
2193 return val;
2195 if (strcmp(type, "u8") == 0)
2196 return val & 0xff;
2198 if (strcmp(type, "u16") == 0)
2199 return val & 0xffff;
2201 if (strcmp(type, "u32") == 0)
2202 return val & 0xffffffff;
2204 if (strcmp(type, "u64") == 0 ||
2205 strcmp(type, "s64"))
2206 return val;
2208 if (strcmp(type, "s8") == 0)
2209 return (unsigned long long)(char)val & 0xff;
2211 if (strcmp(type, "s16") == 0)
2212 return (unsigned long long)(short)val & 0xffff;
2214 if (strcmp(type, "s32") == 0)
2215 return (unsigned long long)(int)val & 0xffffffff;
2217 if (strncmp(type, "unsigned ", 9) == 0) {
2218 sign = 0;
2219 type += 9;
2222 if (strcmp(type, "char") == 0) {
2223 if (sign)
2224 return (unsigned long long)(char)val & 0xff;
2225 else
2226 return val & 0xff;
2229 if (strcmp(type, "short") == 0) {
2230 if (sign)
2231 return (unsigned long long)(short)val & 0xffff;
2232 else
2233 return val & 0xffff;
2236 if (strcmp(type, "int") == 0) {
2237 if (sign)
2238 return (unsigned long long)(int)val & 0xffffffff;
2239 else
2240 return val & 0xffffffff;
2243 return val;
2247 * Try to figure out the type.
2249 static unsigned long long
2250 eval_type(unsigned long long val, struct print_arg *arg, int pointer)
2252 if (arg->type != PRINT_TYPE) {
2253 do_warning("expected type argument");
2254 return 0;
2257 return eval_type_str(val, arg->typecast.type, pointer);
2260 static int arg_num_eval(struct print_arg *arg, long long *val)
2262 long long left, right;
2263 int ret = 1;
2265 switch (arg->type) {
2266 case PRINT_ATOM:
2267 *val = strtoll(arg->atom.atom, NULL, 0);
2268 break;
2269 case PRINT_TYPE:
2270 ret = arg_num_eval(arg->typecast.item, val);
2271 if (!ret)
2272 break;
2273 *val = eval_type(*val, arg, 0);
2274 break;
2275 case PRINT_OP:
2276 switch (arg->op.op[0]) {
2277 case '|':
2278 ret = arg_num_eval(arg->op.left, &left);
2279 if (!ret)
2280 break;
2281 ret = arg_num_eval(arg->op.right, &right);
2282 if (!ret)
2283 break;
2284 if (arg->op.op[1])
2285 *val = left || right;
2286 else
2287 *val = left | right;
2288 break;
2289 case '&':
2290 ret = arg_num_eval(arg->op.left, &left);
2291 if (!ret)
2292 break;
2293 ret = arg_num_eval(arg->op.right, &right);
2294 if (!ret)
2295 break;
2296 if (arg->op.op[1])
2297 *val = left && right;
2298 else
2299 *val = left & right;
2300 break;
2301 case '<':
2302 ret = arg_num_eval(arg->op.left, &left);
2303 if (!ret)
2304 break;
2305 ret = arg_num_eval(arg->op.right, &right);
2306 if (!ret)
2307 break;
2308 switch (arg->op.op[1]) {
2309 case 0:
2310 *val = left < right;
2311 break;
2312 case '<':
2313 *val = left << right;
2314 break;
2315 case '=':
2316 *val = left <= right;
2317 break;
2318 default:
2319 do_warning("unknown op '%s'", arg->op.op);
2320 ret = 0;
2322 break;
2323 case '>':
2324 ret = arg_num_eval(arg->op.left, &left);
2325 if (!ret)
2326 break;
2327 ret = arg_num_eval(arg->op.right, &right);
2328 if (!ret)
2329 break;
2330 switch (arg->op.op[1]) {
2331 case 0:
2332 *val = left > right;
2333 break;
2334 case '>':
2335 *val = left >> right;
2336 break;
2337 case '=':
2338 *val = left >= right;
2339 break;
2340 default:
2341 do_warning("unknown op '%s'", arg->op.op);
2342 ret = 0;
2344 break;
2345 case '=':
2346 ret = arg_num_eval(arg->op.left, &left);
2347 if (!ret)
2348 break;
2349 ret = arg_num_eval(arg->op.right, &right);
2350 if (!ret)
2351 break;
2353 if (arg->op.op[1] != '=') {
2354 do_warning("unknown op '%s'", arg->op.op);
2355 ret = 0;
2356 } else
2357 *val = left == right;
2358 break;
2359 case '!':
2360 ret = arg_num_eval(arg->op.left, &left);
2361 if (!ret)
2362 break;
2363 ret = arg_num_eval(arg->op.right, &right);
2364 if (!ret)
2365 break;
2367 switch (arg->op.op[1]) {
2368 case '=':
2369 *val = left != right;
2370 break;
2371 default:
2372 do_warning("unknown op '%s'", arg->op.op);
2373 ret = 0;
2375 break;
2376 case '-':
2377 /* check for negative */
2378 if (arg->op.left->type == PRINT_NULL)
2379 left = 0;
2380 else
2381 ret = arg_num_eval(arg->op.left, &left);
2382 if (!ret)
2383 break;
2384 ret = arg_num_eval(arg->op.right, &right);
2385 if (!ret)
2386 break;
2387 *val = left - right;
2388 break;
2389 case '+':
2390 if (arg->op.left->type == PRINT_NULL)
2391 left = 0;
2392 else
2393 ret = arg_num_eval(arg->op.left, &left);
2394 if (!ret)
2395 break;
2396 ret = arg_num_eval(arg->op.right, &right);
2397 if (!ret)
2398 break;
2399 *val = left + right;
2400 break;
2401 case '~':
2402 ret = arg_num_eval(arg->op.right, &right);
2403 if (!ret)
2404 break;
2405 *val = ~right;
2406 break;
2407 default:
2408 do_warning("unknown op '%s'", arg->op.op);
2409 ret = 0;
2411 break;
2413 case PRINT_NULL:
2414 case PRINT_FIELD ... PRINT_SYMBOL:
2415 case PRINT_STRING:
2416 case PRINT_BSTRING:
2417 case PRINT_BITMASK:
2418 default:
2419 do_warning("invalid eval type %d", arg->type);
2420 ret = 0;
2423 return ret;
2426 static char *arg_eval (struct print_arg *arg)
2428 long long val;
2429 static char buf[20];
2431 switch (arg->type) {
2432 case PRINT_ATOM:
2433 return arg->atom.atom;
2434 case PRINT_TYPE:
2435 return arg_eval(arg->typecast.item);
2436 case PRINT_OP:
2437 if (!arg_num_eval(arg, &val))
2438 break;
2439 sprintf(buf, "%lld", val);
2440 return buf;
2442 case PRINT_NULL:
2443 case PRINT_FIELD ... PRINT_SYMBOL:
2444 case PRINT_STRING:
2445 case PRINT_BSTRING:
2446 case PRINT_BITMASK:
2447 default:
2448 do_warning("invalid eval type %d", arg->type);
2449 break;
2452 return NULL;
2455 static enum event_type
2456 process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2458 enum event_type type;
2459 struct print_arg *arg = NULL;
2460 struct print_flag_sym *field;
2461 char *token = *tok;
2462 char *value;
2464 do {
2465 free_token(token);
2466 type = read_token_item(&token);
2467 if (test_type_token(type, token, EVENT_OP, "{"))
2468 break;
2470 arg = alloc_arg();
2471 if (!arg)
2472 goto out_free;
2474 free_token(token);
2475 type = process_arg(event, arg, &token);
2477 if (type == EVENT_OP)
2478 type = process_op(event, arg, &token);
2480 if (type == EVENT_ERROR)
2481 goto out_free;
2483 if (test_type_token(type, token, EVENT_DELIM, ","))
2484 goto out_free;
2486 field = calloc(1, sizeof(*field));
2487 if (!field)
2488 goto out_free;
2490 value = arg_eval(arg);
2491 if (value == NULL)
2492 goto out_free_field;
2493 field->value = strdup(value);
2494 if (field->value == NULL)
2495 goto out_free_field;
2497 free_arg(arg);
2498 arg = alloc_arg();
2499 if (!arg)
2500 goto out_free;
2502 free_token(token);
2503 type = process_arg(event, arg, &token);
2504 if (test_type_token(type, token, EVENT_OP, "}"))
2505 goto out_free_field;
2507 value = arg_eval(arg);
2508 if (value == NULL)
2509 goto out_free_field;
2510 field->str = strdup(value);
2511 if (field->str == NULL)
2512 goto out_free_field;
2513 free_arg(arg);
2514 arg = NULL;
2516 *list = field;
2517 list = &field->next;
2519 free_token(token);
2520 type = read_token_item(&token);
2521 } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2523 *tok = token;
2524 return type;
2526 out_free_field:
2527 free_flag_sym(field);
2528 out_free:
2529 free_arg(arg);
2530 free_token(token);
2531 *tok = NULL;
2533 return EVENT_ERROR;
2536 static enum event_type
2537 process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2539 struct print_arg *field;
2540 enum event_type type;
2541 char *token = NULL;
2543 memset(arg, 0, sizeof(*arg));
2544 arg->type = PRINT_FLAGS;
2546 field = alloc_arg();
2547 if (!field) {
2548 do_warning_event(event, "%s: not enough memory!", __func__);
2549 goto out_free;
2552 type = process_field_arg(event, field, &token);
2554 /* Handle operations in the first argument */
2555 while (type == EVENT_OP)
2556 type = process_op(event, field, &token);
2558 if (test_type_token(type, token, EVENT_DELIM, ","))
2559 goto out_free_field;
2560 free_token(token);
2562 arg->flags.field = field;
2564 type = read_token_item(&token);
2565 if (event_item_type(type)) {
2566 arg->flags.delim = token;
2567 type = read_token_item(&token);
2570 if (test_type_token(type, token, EVENT_DELIM, ","))
2571 goto out_free;
2573 type = process_fields(event, &arg->flags.flags, &token);
2574 if (test_type_token(type, token, EVENT_DELIM, ")"))
2575 goto out_free;
2577 free_token(token);
2578 type = read_token_item(tok);
2579 return type;
2581 out_free_field:
2582 free_arg(field);
2583 out_free:
2584 free_token(token);
2585 *tok = NULL;
2586 return EVENT_ERROR;
2589 static enum event_type
2590 process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2592 struct print_arg *field;
2593 enum event_type type;
2594 char *token = NULL;
2596 memset(arg, 0, sizeof(*arg));
2597 arg->type = PRINT_SYMBOL;
2599 field = alloc_arg();
2600 if (!field) {
2601 do_warning_event(event, "%s: not enough memory!", __func__);
2602 goto out_free;
2605 type = process_field_arg(event, field, &token);
2607 if (test_type_token(type, token, EVENT_DELIM, ","))
2608 goto out_free_field;
2610 arg->symbol.field = field;
2612 type = process_fields(event, &arg->symbol.symbols, &token);
2613 if (test_type_token(type, token, EVENT_DELIM, ")"))
2614 goto out_free;
2616 free_token(token);
2617 type = read_token_item(tok);
2618 return type;
2620 out_free_field:
2621 free_arg(field);
2622 out_free:
2623 free_token(token);
2624 *tok = NULL;
2625 return EVENT_ERROR;
2628 static enum event_type
2629 process_hex(struct event_format *event, struct print_arg *arg, char **tok)
2631 memset(arg, 0, sizeof(*arg));
2632 arg->type = PRINT_HEX;
2634 if (alloc_and_process_delim(event, ",", &arg->hex.field))
2635 goto out;
2637 if (alloc_and_process_delim(event, ")", &arg->hex.size))
2638 goto free_field;
2640 return read_token_item(tok);
2642 free_field:
2643 free_arg(arg->hex.field);
2644 arg->hex.field = NULL;
2645 out:
2646 *tok = NULL;
2647 return EVENT_ERROR;
2650 static enum event_type
2651 process_int_array(struct event_format *event, struct print_arg *arg, char **tok)
2653 memset(arg, 0, sizeof(*arg));
2654 arg->type = PRINT_INT_ARRAY;
2656 if (alloc_and_process_delim(event, ",", &arg->int_array.field))
2657 goto out;
2659 if (alloc_and_process_delim(event, ",", &arg->int_array.count))
2660 goto free_field;
2662 if (alloc_and_process_delim(event, ")", &arg->int_array.el_size))
2663 goto free_size;
2665 return read_token_item(tok);
2667 free_size:
2668 free_arg(arg->int_array.count);
2669 arg->int_array.count = NULL;
2670 free_field:
2671 free_arg(arg->int_array.field);
2672 arg->int_array.field = NULL;
2673 out:
2674 *tok = NULL;
2675 return EVENT_ERROR;
2678 static enum event_type
2679 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2681 struct format_field *field;
2682 enum event_type type;
2683 char *token;
2685 memset(arg, 0, sizeof(*arg));
2686 arg->type = PRINT_DYNAMIC_ARRAY;
2689 * The item within the parenthesis is another field that holds
2690 * the index into where the array starts.
2692 type = read_token(&token);
2693 *tok = token;
2694 if (type != EVENT_ITEM)
2695 goto out_free;
2697 /* Find the field */
2699 field = pevent_find_field(event, token);
2700 if (!field)
2701 goto out_free;
2703 arg->dynarray.field = field;
2704 arg->dynarray.index = 0;
2706 if (read_expected(EVENT_DELIM, ")") < 0)
2707 goto out_free;
2709 free_token(token);
2710 type = read_token_item(&token);
2711 *tok = token;
2712 if (type != EVENT_OP || strcmp(token, "[") != 0)
2713 return type;
2715 free_token(token);
2716 arg = alloc_arg();
2717 if (!arg) {
2718 do_warning_event(event, "%s: not enough memory!", __func__);
2719 *tok = NULL;
2720 return EVENT_ERROR;
2723 type = process_arg(event, arg, &token);
2724 if (type == EVENT_ERROR)
2725 goto out_free_arg;
2727 if (!test_type_token(type, token, EVENT_OP, "]"))
2728 goto out_free_arg;
2730 free_token(token);
2731 type = read_token_item(tok);
2732 return type;
2734 out_free_arg:
2735 free_arg(arg);
2736 out_free:
2737 free_token(token);
2738 *tok = NULL;
2739 return EVENT_ERROR;
2742 static enum event_type
2743 process_dynamic_array_len(struct event_format *event, struct print_arg *arg,
2744 char **tok)
2746 struct format_field *field;
2747 enum event_type type;
2748 char *token;
2750 if (read_expect_type(EVENT_ITEM, &token) < 0)
2751 goto out_free;
2753 arg->type = PRINT_DYNAMIC_ARRAY_LEN;
2755 /* Find the field */
2756 field = pevent_find_field(event, token);
2757 if (!field)
2758 goto out_free;
2760 arg->dynarray.field = field;
2761 arg->dynarray.index = 0;
2763 if (read_expected(EVENT_DELIM, ")") < 0)
2764 goto out_err;
2766 type = read_token(&token);
2767 *tok = token;
2769 return type;
2771 out_free:
2772 free_token(token);
2773 out_err:
2774 *tok = NULL;
2775 return EVENT_ERROR;
2778 static enum event_type
2779 process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2781 struct print_arg *item_arg;
2782 enum event_type type;
2783 char *token;
2785 type = process_arg(event, arg, &token);
2787 if (type == EVENT_ERROR)
2788 goto out_free;
2790 if (type == EVENT_OP)
2791 type = process_op(event, arg, &token);
2793 if (type == EVENT_ERROR)
2794 goto out_free;
2796 if (test_type_token(type, token, EVENT_DELIM, ")"))
2797 goto out_free;
2799 free_token(token);
2800 type = read_token_item(&token);
2803 * If the next token is an item or another open paren, then
2804 * this was a typecast.
2806 if (event_item_type(type) ||
2807 (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2809 /* make this a typecast and contine */
2811 /* prevous must be an atom */
2812 if (arg->type != PRINT_ATOM) {
2813 do_warning_event(event, "previous needed to be PRINT_ATOM");
2814 goto out_free;
2817 item_arg = alloc_arg();
2818 if (!item_arg) {
2819 do_warning_event(event, "%s: not enough memory!",
2820 __func__);
2821 goto out_free;
2824 arg->type = PRINT_TYPE;
2825 arg->typecast.type = arg->atom.atom;
2826 arg->typecast.item = item_arg;
2827 type = process_arg_token(event, item_arg, &token, type);
2831 *tok = token;
2832 return type;
2834 out_free:
2835 free_token(token);
2836 *tok = NULL;
2837 return EVENT_ERROR;
2841 static enum event_type
2842 process_str(struct event_format *event __maybe_unused, struct print_arg *arg,
2843 char **tok)
2845 enum event_type type;
2846 char *token;
2848 if (read_expect_type(EVENT_ITEM, &token) < 0)
2849 goto out_free;
2851 arg->type = PRINT_STRING;
2852 arg->string.string = token;
2853 arg->string.offset = -1;
2855 if (read_expected(EVENT_DELIM, ")") < 0)
2856 goto out_err;
2858 type = read_token(&token);
2859 *tok = token;
2861 return type;
2863 out_free:
2864 free_token(token);
2865 out_err:
2866 *tok = NULL;
2867 return EVENT_ERROR;
2870 static enum event_type
2871 process_bitmask(struct event_format *event __maybe_unused, struct print_arg *arg,
2872 char **tok)
2874 enum event_type type;
2875 char *token;
2877 if (read_expect_type(EVENT_ITEM, &token) < 0)
2878 goto out_free;
2880 arg->type = PRINT_BITMASK;
2881 arg->bitmask.bitmask = token;
2882 arg->bitmask.offset = -1;
2884 if (read_expected(EVENT_DELIM, ")") < 0)
2885 goto out_err;
2887 type = read_token(&token);
2888 *tok = token;
2890 return type;
2892 out_free:
2893 free_token(token);
2894 out_err:
2895 *tok = NULL;
2896 return EVENT_ERROR;
2899 static struct pevent_function_handler *
2900 find_func_handler(struct pevent *pevent, char *func_name)
2902 struct pevent_function_handler *func;
2904 if (!pevent)
2905 return NULL;
2907 for (func = pevent->func_handlers; func; func = func->next) {
2908 if (strcmp(func->name, func_name) == 0)
2909 break;
2912 return func;
2915 static void remove_func_handler(struct pevent *pevent, char *func_name)
2917 struct pevent_function_handler *func;
2918 struct pevent_function_handler **next;
2920 next = &pevent->func_handlers;
2921 while ((func = *next)) {
2922 if (strcmp(func->name, func_name) == 0) {
2923 *next = func->next;
2924 free_func_handle(func);
2925 break;
2927 next = &func->next;
2931 static enum event_type
2932 process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2933 struct print_arg *arg, char **tok)
2935 struct print_arg **next_arg;
2936 struct print_arg *farg;
2937 enum event_type type;
2938 char *token;
2939 int i;
2941 arg->type = PRINT_FUNC;
2942 arg->func.func = func;
2944 *tok = NULL;
2946 next_arg = &(arg->func.args);
2947 for (i = 0; i < func->nr_args; i++) {
2948 farg = alloc_arg();
2949 if (!farg) {
2950 do_warning_event(event, "%s: not enough memory!",
2951 __func__);
2952 return EVENT_ERROR;
2955 type = process_arg(event, farg, &token);
2956 if (i < (func->nr_args - 1)) {
2957 if (type != EVENT_DELIM || strcmp(token, ",") != 0) {
2958 do_warning_event(event,
2959 "Error: function '%s()' expects %d arguments but event %s only uses %d",
2960 func->name, func->nr_args,
2961 event->name, i + 1);
2962 goto err;
2964 } else {
2965 if (type != EVENT_DELIM || strcmp(token, ")") != 0) {
2966 do_warning_event(event,
2967 "Error: function '%s()' only expects %d arguments but event %s has more",
2968 func->name, func->nr_args, event->name);
2969 goto err;
2973 *next_arg = farg;
2974 next_arg = &(farg->next);
2975 free_token(token);
2978 type = read_token(&token);
2979 *tok = token;
2981 return type;
2983 err:
2984 free_arg(farg);
2985 free_token(token);
2986 return EVENT_ERROR;
2989 static enum event_type
2990 process_function(struct event_format *event, struct print_arg *arg,
2991 char *token, char **tok)
2993 struct pevent_function_handler *func;
2995 if (strcmp(token, "__print_flags") == 0) {
2996 free_token(token);
2997 is_flag_field = 1;
2998 return process_flags(event, arg, tok);
3000 if (strcmp(token, "__print_symbolic") == 0) {
3001 free_token(token);
3002 is_symbolic_field = 1;
3003 return process_symbols(event, arg, tok);
3005 if (strcmp(token, "__print_hex") == 0) {
3006 free_token(token);
3007 return process_hex(event, arg, tok);
3009 if (strcmp(token, "__print_array") == 0) {
3010 free_token(token);
3011 return process_int_array(event, arg, tok);
3013 if (strcmp(token, "__get_str") == 0) {
3014 free_token(token);
3015 return process_str(event, arg, tok);
3017 if (strcmp(token, "__get_bitmask") == 0) {
3018 free_token(token);
3019 return process_bitmask(event, arg, tok);
3021 if (strcmp(token, "__get_dynamic_array") == 0) {
3022 free_token(token);
3023 return process_dynamic_array(event, arg, tok);
3025 if (strcmp(token, "__get_dynamic_array_len") == 0) {
3026 free_token(token);
3027 return process_dynamic_array_len(event, arg, tok);
3030 func = find_func_handler(event->pevent, token);
3031 if (func) {
3032 free_token(token);
3033 return process_func_handler(event, func, arg, tok);
3036 do_warning_event(event, "function %s not defined", token);
3037 free_token(token);
3038 return EVENT_ERROR;
3041 static enum event_type
3042 process_arg_token(struct event_format *event, struct print_arg *arg,
3043 char **tok, enum event_type type)
3045 char *token;
3046 char *atom;
3048 token = *tok;
3050 switch (type) {
3051 case EVENT_ITEM:
3052 if (strcmp(token, "REC") == 0) {
3053 free_token(token);
3054 type = process_entry(event, arg, &token);
3055 break;
3057 atom = token;
3058 /* test the next token */
3059 type = read_token_item(&token);
3062 * If the next token is a parenthesis, then this
3063 * is a function.
3065 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
3066 free_token(token);
3067 token = NULL;
3068 /* this will free atom. */
3069 type = process_function(event, arg, atom, &token);
3070 break;
3072 /* atoms can be more than one token long */
3073 while (type == EVENT_ITEM) {
3074 char *new_atom;
3075 new_atom = realloc(atom,
3076 strlen(atom) + strlen(token) + 2);
3077 if (!new_atom) {
3078 free(atom);
3079 *tok = NULL;
3080 free_token(token);
3081 return EVENT_ERROR;
3083 atom = new_atom;
3084 strcat(atom, " ");
3085 strcat(atom, token);
3086 free_token(token);
3087 type = read_token_item(&token);
3090 arg->type = PRINT_ATOM;
3091 arg->atom.atom = atom;
3092 break;
3094 case EVENT_DQUOTE:
3095 case EVENT_SQUOTE:
3096 arg->type = PRINT_ATOM;
3097 arg->atom.atom = token;
3098 type = read_token_item(&token);
3099 break;
3100 case EVENT_DELIM:
3101 if (strcmp(token, "(") == 0) {
3102 free_token(token);
3103 type = process_paren(event, arg, &token);
3104 break;
3106 case EVENT_OP:
3107 /* handle single ops */
3108 arg->type = PRINT_OP;
3109 arg->op.op = token;
3110 arg->op.left = NULL;
3111 type = process_op(event, arg, &token);
3113 /* On error, the op is freed */
3114 if (type == EVENT_ERROR)
3115 arg->op.op = NULL;
3117 /* return error type if errored */
3118 break;
3120 case EVENT_ERROR ... EVENT_NEWLINE:
3121 default:
3122 do_warning_event(event, "unexpected type %d", type);
3123 return EVENT_ERROR;
3125 *tok = token;
3127 return type;
3130 static int event_read_print_args(struct event_format *event, struct print_arg **list)
3132 enum event_type type = EVENT_ERROR;
3133 struct print_arg *arg;
3134 char *token;
3135 int args = 0;
3137 do {
3138 if (type == EVENT_NEWLINE) {
3139 type = read_token_item(&token);
3140 continue;
3143 arg = alloc_arg();
3144 if (!arg) {
3145 do_warning_event(event, "%s: not enough memory!",
3146 __func__);
3147 return -1;
3150 type = process_arg(event, arg, &token);
3152 if (type == EVENT_ERROR) {
3153 free_token(token);
3154 free_arg(arg);
3155 return -1;
3158 *list = arg;
3159 args++;
3161 if (type == EVENT_OP) {
3162 type = process_op(event, arg, &token);
3163 free_token(token);
3164 if (type == EVENT_ERROR) {
3165 *list = NULL;
3166 free_arg(arg);
3167 return -1;
3169 list = &arg->next;
3170 continue;
3173 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
3174 free_token(token);
3175 *list = arg;
3176 list = &arg->next;
3177 continue;
3179 break;
3180 } while (type != EVENT_NONE);
3182 if (type != EVENT_NONE && type != EVENT_ERROR)
3183 free_token(token);
3185 return args;
3188 static int event_read_print(struct event_format *event)
3190 enum event_type type;
3191 char *token;
3192 int ret;
3194 if (read_expected_item(EVENT_ITEM, "print") < 0)
3195 return -1;
3197 if (read_expected(EVENT_ITEM, "fmt") < 0)
3198 return -1;
3200 if (read_expected(EVENT_OP, ":") < 0)
3201 return -1;
3203 if (read_expect_type(EVENT_DQUOTE, &token) < 0)
3204 goto fail;
3206 concat:
3207 event->print_fmt.format = token;
3208 event->print_fmt.args = NULL;
3210 /* ok to have no arg */
3211 type = read_token_item(&token);
3213 if (type == EVENT_NONE)
3214 return 0;
3216 /* Handle concatenation of print lines */
3217 if (type == EVENT_DQUOTE) {
3218 char *cat;
3220 if (asprintf(&cat, "%s%s", event->print_fmt.format, token) < 0)
3221 goto fail;
3222 free_token(token);
3223 free_token(event->print_fmt.format);
3224 event->print_fmt.format = NULL;
3225 token = cat;
3226 goto concat;
3229 if (test_type_token(type, token, EVENT_DELIM, ","))
3230 goto fail;
3232 free_token(token);
3234 ret = event_read_print_args(event, &event->print_fmt.args);
3235 if (ret < 0)
3236 return -1;
3238 return ret;
3240 fail:
3241 free_token(token);
3242 return -1;
3246 * pevent_find_common_field - return a common field by event
3247 * @event: handle for the event
3248 * @name: the name of the common field to return
3250 * Returns a common field from the event by the given @name.
3251 * This only searchs the common fields and not all field.
3253 struct format_field *
3254 pevent_find_common_field(struct event_format *event, const char *name)
3256 struct format_field *format;
3258 for (format = event->format.common_fields;
3259 format; format = format->next) {
3260 if (strcmp(format->name, name) == 0)
3261 break;
3264 return format;
3268 * pevent_find_field - find a non-common field
3269 * @event: handle for the event
3270 * @name: the name of the non-common field
3272 * Returns a non-common field by the given @name.
3273 * This does not search common fields.
3275 struct format_field *
3276 pevent_find_field(struct event_format *event, const char *name)
3278 struct format_field *format;
3280 for (format = event->format.fields;
3281 format; format = format->next) {
3282 if (strcmp(format->name, name) == 0)
3283 break;
3286 return format;
3290 * pevent_find_any_field - find any field by name
3291 * @event: handle for the event
3292 * @name: the name of the field
3294 * Returns a field by the given @name.
3295 * This searchs the common field names first, then
3296 * the non-common ones if a common one was not found.
3298 struct format_field *
3299 pevent_find_any_field(struct event_format *event, const char *name)
3301 struct format_field *format;
3303 format = pevent_find_common_field(event, name);
3304 if (format)
3305 return format;
3306 return pevent_find_field(event, name);
3310 * pevent_read_number - read a number from data
3311 * @pevent: handle for the pevent
3312 * @ptr: the raw data
3313 * @size: the size of the data that holds the number
3315 * Returns the number (converted to host) from the
3316 * raw data.
3318 unsigned long long pevent_read_number(struct pevent *pevent,
3319 const void *ptr, int size)
3321 switch (size) {
3322 case 1:
3323 return *(unsigned char *)ptr;
3324 case 2:
3325 return data2host2(pevent, ptr);
3326 case 4:
3327 return data2host4(pevent, ptr);
3328 case 8:
3329 return data2host8(pevent, ptr);
3330 default:
3331 /* BUG! */
3332 return 0;
3337 * pevent_read_number_field - read a number from data
3338 * @field: a handle to the field
3339 * @data: the raw data to read
3340 * @value: the value to place the number in
3342 * Reads raw data according to a field offset and size,
3343 * and translates it into @value.
3345 * Returns 0 on success, -1 otherwise.
3347 int pevent_read_number_field(struct format_field *field, const void *data,
3348 unsigned long long *value)
3350 if (!field)
3351 return -1;
3352 switch (field->size) {
3353 case 1:
3354 case 2:
3355 case 4:
3356 case 8:
3357 *value = pevent_read_number(field->event->pevent,
3358 data + field->offset, field->size);
3359 return 0;
3360 default:
3361 return -1;
3365 static int get_common_info(struct pevent *pevent,
3366 const char *type, int *offset, int *size)
3368 struct event_format *event;
3369 struct format_field *field;
3372 * All events should have the same common elements.
3373 * Pick any event to find where the type is;
3375 if (!pevent->events) {
3376 do_warning("no event_list!");
3377 return -1;
3380 event = pevent->events[0];
3381 field = pevent_find_common_field(event, type);
3382 if (!field)
3383 return -1;
3385 *offset = field->offset;
3386 *size = field->size;
3388 return 0;
3391 static int __parse_common(struct pevent *pevent, void *data,
3392 int *size, int *offset, const char *name)
3394 int ret;
3396 if (!*size) {
3397 ret = get_common_info(pevent, name, offset, size);
3398 if (ret < 0)
3399 return ret;
3401 return pevent_read_number(pevent, data + *offset, *size);
3404 static int trace_parse_common_type(struct pevent *pevent, void *data)
3406 return __parse_common(pevent, data,
3407 &pevent->type_size, &pevent->type_offset,
3408 "common_type");
3411 static int parse_common_pid(struct pevent *pevent, void *data)
3413 return __parse_common(pevent, data,
3414 &pevent->pid_size, &pevent->pid_offset,
3415 "common_pid");
3418 static int parse_common_pc(struct pevent *pevent, void *data)
3420 return __parse_common(pevent, data,
3421 &pevent->pc_size, &pevent->pc_offset,
3422 "common_preempt_count");
3425 static int parse_common_flags(struct pevent *pevent, void *data)
3427 return __parse_common(pevent, data,
3428 &pevent->flags_size, &pevent->flags_offset,
3429 "common_flags");
3432 static int parse_common_lock_depth(struct pevent *pevent, void *data)
3434 return __parse_common(pevent, data,
3435 &pevent->ld_size, &pevent->ld_offset,
3436 "common_lock_depth");
3439 static int parse_common_migrate_disable(struct pevent *pevent, void *data)
3441 return __parse_common(pevent, data,
3442 &pevent->ld_size, &pevent->ld_offset,
3443 "common_migrate_disable");
3446 static int events_id_cmp(const void *a, const void *b);
3449 * pevent_find_event - find an event by given id
3450 * @pevent: a handle to the pevent
3451 * @id: the id of the event
3453 * Returns an event that has a given @id.
3455 struct event_format *pevent_find_event(struct pevent *pevent, int id)
3457 struct event_format **eventptr;
3458 struct event_format key;
3459 struct event_format *pkey = &key;
3461 /* Check cache first */
3462 if (pevent->last_event && pevent->last_event->id == id)
3463 return pevent->last_event;
3465 key.id = id;
3467 eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
3468 sizeof(*pevent->events), events_id_cmp);
3470 if (eventptr) {
3471 pevent->last_event = *eventptr;
3472 return *eventptr;
3475 return NULL;
3479 * pevent_find_event_by_name - find an event by given name
3480 * @pevent: a handle to the pevent
3481 * @sys: the system name to search for
3482 * @name: the name of the event to search for
3484 * This returns an event with a given @name and under the system
3485 * @sys. If @sys is NULL the first event with @name is returned.
3487 struct event_format *
3488 pevent_find_event_by_name(struct pevent *pevent,
3489 const char *sys, const char *name)
3491 struct event_format *event;
3492 int i;
3494 if (pevent->last_event &&
3495 strcmp(pevent->last_event->name, name) == 0 &&
3496 (!sys || strcmp(pevent->last_event->system, sys) == 0))
3497 return pevent->last_event;
3499 for (i = 0; i < pevent->nr_events; i++) {
3500 event = pevent->events[i];
3501 if (strcmp(event->name, name) == 0) {
3502 if (!sys)
3503 break;
3504 if (strcmp(event->system, sys) == 0)
3505 break;
3508 if (i == pevent->nr_events)
3509 event = NULL;
3511 pevent->last_event = event;
3512 return event;
3515 static unsigned long long
3516 eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
3518 struct pevent *pevent = event->pevent;
3519 unsigned long long val = 0;
3520 unsigned long long left, right;
3521 struct print_arg *typearg = NULL;
3522 struct print_arg *larg;
3523 unsigned long offset;
3524 unsigned int field_size;
3526 switch (arg->type) {
3527 case PRINT_NULL:
3528 /* ?? */
3529 return 0;
3530 case PRINT_ATOM:
3531 return strtoull(arg->atom.atom, NULL, 0);
3532 case PRINT_FIELD:
3533 if (!arg->field.field) {
3534 arg->field.field = pevent_find_any_field(event, arg->field.name);
3535 if (!arg->field.field)
3536 goto out_warning_field;
3539 /* must be a number */
3540 val = pevent_read_number(pevent, data + arg->field.field->offset,
3541 arg->field.field->size);
3542 break;
3543 case PRINT_FLAGS:
3544 case PRINT_SYMBOL:
3545 case PRINT_INT_ARRAY:
3546 case PRINT_HEX:
3547 break;
3548 case PRINT_TYPE:
3549 val = eval_num_arg(data, size, event, arg->typecast.item);
3550 return eval_type(val, arg, 0);
3551 case PRINT_STRING:
3552 case PRINT_BSTRING:
3553 case PRINT_BITMASK:
3554 return 0;
3555 case PRINT_FUNC: {
3556 struct trace_seq s;
3557 trace_seq_init(&s);
3558 val = process_defined_func(&s, data, size, event, arg);
3559 trace_seq_destroy(&s);
3560 return val;
3562 case PRINT_OP:
3563 if (strcmp(arg->op.op, "[") == 0) {
3565 * Arrays are special, since we don't want
3566 * to read the arg as is.
3568 right = eval_num_arg(data, size, event, arg->op.right);
3570 /* handle typecasts */
3571 larg = arg->op.left;
3572 while (larg->type == PRINT_TYPE) {
3573 if (!typearg)
3574 typearg = larg;
3575 larg = larg->typecast.item;
3578 /* Default to long size */
3579 field_size = pevent->long_size;
3581 switch (larg->type) {
3582 case PRINT_DYNAMIC_ARRAY:
3583 offset = pevent_read_number(pevent,
3584 data + larg->dynarray.field->offset,
3585 larg->dynarray.field->size);
3586 if (larg->dynarray.field->elementsize)
3587 field_size = larg->dynarray.field->elementsize;
3589 * The actual length of the dynamic array is stored
3590 * in the top half of the field, and the offset
3591 * is in the bottom half of the 32 bit field.
3593 offset &= 0xffff;
3594 offset += right;
3595 break;
3596 case PRINT_FIELD:
3597 if (!larg->field.field) {
3598 larg->field.field =
3599 pevent_find_any_field(event, larg->field.name);
3600 if (!larg->field.field) {
3601 arg = larg;
3602 goto out_warning_field;
3605 field_size = larg->field.field->elementsize;
3606 offset = larg->field.field->offset +
3607 right * larg->field.field->elementsize;
3608 break;
3609 default:
3610 goto default_op; /* oops, all bets off */
3612 val = pevent_read_number(pevent,
3613 data + offset, field_size);
3614 if (typearg)
3615 val = eval_type(val, typearg, 1);
3616 break;
3617 } else if (strcmp(arg->op.op, "?") == 0) {
3618 left = eval_num_arg(data, size, event, arg->op.left);
3619 arg = arg->op.right;
3620 if (left)
3621 val = eval_num_arg(data, size, event, arg->op.left);
3622 else
3623 val = eval_num_arg(data, size, event, arg->op.right);
3624 break;
3626 default_op:
3627 left = eval_num_arg(data, size, event, arg->op.left);
3628 right = eval_num_arg(data, size, event, arg->op.right);
3629 switch (arg->op.op[0]) {
3630 case '!':
3631 switch (arg->op.op[1]) {
3632 case 0:
3633 val = !right;
3634 break;
3635 case '=':
3636 val = left != right;
3637 break;
3638 default:
3639 goto out_warning_op;
3641 break;
3642 case '~':
3643 val = ~right;
3644 break;
3645 case '|':
3646 if (arg->op.op[1])
3647 val = left || right;
3648 else
3649 val = left | right;
3650 break;
3651 case '&':
3652 if (arg->op.op[1])
3653 val = left && right;
3654 else
3655 val = left & right;
3656 break;
3657 case '<':
3658 switch (arg->op.op[1]) {
3659 case 0:
3660 val = left < right;
3661 break;
3662 case '<':
3663 val = left << right;
3664 break;
3665 case '=':
3666 val = left <= right;
3667 break;
3668 default:
3669 goto out_warning_op;
3671 break;
3672 case '>':
3673 switch (arg->op.op[1]) {
3674 case 0:
3675 val = left > right;
3676 break;
3677 case '>':
3678 val = left >> right;
3679 break;
3680 case '=':
3681 val = left >= right;
3682 break;
3683 default:
3684 goto out_warning_op;
3686 break;
3687 case '=':
3688 if (arg->op.op[1] != '=')
3689 goto out_warning_op;
3691 val = left == right;
3692 break;
3693 case '-':
3694 val = left - right;
3695 break;
3696 case '+':
3697 val = left + right;
3698 break;
3699 case '/':
3700 val = left / right;
3701 break;
3702 case '%':
3703 val = left % right;
3704 break;
3705 case '*':
3706 val = left * right;
3707 break;
3708 default:
3709 goto out_warning_op;
3711 break;
3712 case PRINT_DYNAMIC_ARRAY_LEN:
3713 offset = pevent_read_number(pevent,
3714 data + arg->dynarray.field->offset,
3715 arg->dynarray.field->size);
3717 * The total allocated length of the dynamic array is
3718 * stored in the top half of the field, and the offset
3719 * is in the bottom half of the 32 bit field.
3721 val = (unsigned long long)(offset >> 16);
3722 break;
3723 case PRINT_DYNAMIC_ARRAY:
3724 /* Without [], we pass the address to the dynamic data */
3725 offset = pevent_read_number(pevent,
3726 data + arg->dynarray.field->offset,
3727 arg->dynarray.field->size);
3729 * The total allocated length of the dynamic array is
3730 * stored in the top half of the field, and the offset
3731 * is in the bottom half of the 32 bit field.
3733 offset &= 0xffff;
3734 val = (unsigned long long)((unsigned long)data + offset);
3735 break;
3736 default: /* not sure what to do there */
3737 return 0;
3739 return val;
3741 out_warning_op:
3742 do_warning_event(event, "%s: unknown op '%s'", __func__, arg->op.op);
3743 return 0;
3745 out_warning_field:
3746 do_warning_event(event, "%s: field %s not found",
3747 __func__, arg->field.name);
3748 return 0;
3751 struct flag {
3752 const char *name;
3753 unsigned long long value;
3756 static const struct flag flags[] = {
3757 { "HI_SOFTIRQ", 0 },
3758 { "TIMER_SOFTIRQ", 1 },
3759 { "NET_TX_SOFTIRQ", 2 },
3760 { "NET_RX_SOFTIRQ", 3 },
3761 { "BLOCK_SOFTIRQ", 4 },
3762 { "IRQ_POLL_SOFTIRQ", 5 },
3763 { "TASKLET_SOFTIRQ", 6 },
3764 { "SCHED_SOFTIRQ", 7 },
3765 { "HRTIMER_SOFTIRQ", 8 },
3766 { "RCU_SOFTIRQ", 9 },
3768 { "HRTIMER_NORESTART", 0 },
3769 { "HRTIMER_RESTART", 1 },
3772 static long long eval_flag(const char *flag)
3774 int i;
3777 * Some flags in the format files do not get converted.
3778 * If the flag is not numeric, see if it is something that
3779 * we already know about.
3781 if (isdigit(flag[0]))
3782 return strtoull(flag, NULL, 0);
3784 for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3785 if (strcmp(flags[i].name, flag) == 0)
3786 return flags[i].value;
3788 return -1LL;
3791 static void print_str_to_seq(struct trace_seq *s, const char *format,
3792 int len_arg, const char *str)
3794 if (len_arg >= 0)
3795 trace_seq_printf(s, format, len_arg, str);
3796 else
3797 trace_seq_printf(s, format, str);
3800 static void print_bitmask_to_seq(struct pevent *pevent,
3801 struct trace_seq *s, const char *format,
3802 int len_arg, const void *data, int size)
3804 int nr_bits = size * 8;
3805 int str_size = (nr_bits + 3) / 4;
3806 int len = 0;
3807 char buf[3];
3808 char *str;
3809 int index;
3810 int i;
3813 * The kernel likes to put in commas every 32 bits, we
3814 * can do the same.
3816 str_size += (nr_bits - 1) / 32;
3818 str = malloc(str_size + 1);
3819 if (!str) {
3820 do_warning("%s: not enough memory!", __func__);
3821 return;
3823 str[str_size] = 0;
3825 /* Start out with -2 for the two chars per byte */
3826 for (i = str_size - 2; i >= 0; i -= 2) {
3828 * data points to a bit mask of size bytes.
3829 * In the kernel, this is an array of long words, thus
3830 * endianess is very important.
3832 if (pevent->file_bigendian)
3833 index = size - (len + 1);
3834 else
3835 index = len;
3837 snprintf(buf, 3, "%02x", *((unsigned char *)data + index));
3838 memcpy(str + i, buf, 2);
3839 len++;
3840 if (!(len & 3) && i > 0) {
3841 i--;
3842 str[i] = ',';
3846 if (len_arg >= 0)
3847 trace_seq_printf(s, format, len_arg, str);
3848 else
3849 trace_seq_printf(s, format, str);
3851 free(str);
3854 static void print_str_arg(struct trace_seq *s, void *data, int size,
3855 struct event_format *event, const char *format,
3856 int len_arg, struct print_arg *arg)
3858 struct pevent *pevent = event->pevent;
3859 struct print_flag_sym *flag;
3860 struct format_field *field;
3861 struct printk_map *printk;
3862 long long val, fval;
3863 unsigned long long addr;
3864 char *str;
3865 unsigned char *hex;
3866 int print;
3867 int i, len;
3869 switch (arg->type) {
3870 case PRINT_NULL:
3871 /* ?? */
3872 return;
3873 case PRINT_ATOM:
3874 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3875 return;
3876 case PRINT_FIELD:
3877 field = arg->field.field;
3878 if (!field) {
3879 field = pevent_find_any_field(event, arg->field.name);
3880 if (!field) {
3881 str = arg->field.name;
3882 goto out_warning_field;
3884 arg->field.field = field;
3886 /* Zero sized fields, mean the rest of the data */
3887 len = field->size ? : size - field->offset;
3890 * Some events pass in pointers. If this is not an array
3891 * and the size is the same as long_size, assume that it
3892 * is a pointer.
3894 if (!(field->flags & FIELD_IS_ARRAY) &&
3895 field->size == pevent->long_size) {
3897 /* Handle heterogeneous recording and processing
3898 * architectures
3900 * CASE I:
3901 * Traces recorded on 32-bit devices (32-bit
3902 * addressing) and processed on 64-bit devices:
3903 * In this case, only 32 bits should be read.
3905 * CASE II:
3906 * Traces recorded on 64 bit devices and processed
3907 * on 32-bit devices:
3908 * In this case, 64 bits must be read.
3910 addr = (pevent->long_size == 8) ?
3911 *(unsigned long long *)(data + field->offset) :
3912 (unsigned long long)*(unsigned int *)(data + field->offset);
3914 /* Check if it matches a print format */
3915 printk = find_printk(pevent, addr);
3916 if (printk)
3917 trace_seq_puts(s, printk->printk);
3918 else
3919 trace_seq_printf(s, "%llx", addr);
3920 break;
3922 str = malloc(len + 1);
3923 if (!str) {
3924 do_warning_event(event, "%s: not enough memory!",
3925 __func__);
3926 return;
3928 memcpy(str, data + field->offset, len);
3929 str[len] = 0;
3930 print_str_to_seq(s, format, len_arg, str);
3931 free(str);
3932 break;
3933 case PRINT_FLAGS:
3934 val = eval_num_arg(data, size, event, arg->flags.field);
3935 print = 0;
3936 for (flag = arg->flags.flags; flag; flag = flag->next) {
3937 fval = eval_flag(flag->value);
3938 if (!val && fval < 0) {
3939 print_str_to_seq(s, format, len_arg, flag->str);
3940 break;
3942 if (fval > 0 && (val & fval) == fval) {
3943 if (print && arg->flags.delim)
3944 trace_seq_puts(s, arg->flags.delim);
3945 print_str_to_seq(s, format, len_arg, flag->str);
3946 print = 1;
3947 val &= ~fval;
3950 break;
3951 case PRINT_SYMBOL:
3952 val = eval_num_arg(data, size, event, arg->symbol.field);
3953 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3954 fval = eval_flag(flag->value);
3955 if (val == fval) {
3956 print_str_to_seq(s, format, len_arg, flag->str);
3957 break;
3960 break;
3961 case PRINT_HEX:
3962 if (arg->hex.field->type == PRINT_DYNAMIC_ARRAY) {
3963 unsigned long offset;
3964 offset = pevent_read_number(pevent,
3965 data + arg->hex.field->dynarray.field->offset,
3966 arg->hex.field->dynarray.field->size);
3967 hex = data + (offset & 0xffff);
3968 } else {
3969 field = arg->hex.field->field.field;
3970 if (!field) {
3971 str = arg->hex.field->field.name;
3972 field = pevent_find_any_field(event, str);
3973 if (!field)
3974 goto out_warning_field;
3975 arg->hex.field->field.field = field;
3977 hex = data + field->offset;
3979 len = eval_num_arg(data, size, event, arg->hex.size);
3980 for (i = 0; i < len; i++) {
3981 if (i)
3982 trace_seq_putc(s, ' ');
3983 trace_seq_printf(s, "%02x", hex[i]);
3985 break;
3987 case PRINT_INT_ARRAY: {
3988 void *num;
3989 int el_size;
3991 if (arg->int_array.field->type == PRINT_DYNAMIC_ARRAY) {
3992 unsigned long offset;
3993 struct format_field *field =
3994 arg->int_array.field->dynarray.field;
3995 offset = pevent_read_number(pevent,
3996 data + field->offset,
3997 field->size);
3998 num = data + (offset & 0xffff);
3999 } else {
4000 field = arg->int_array.field->field.field;
4001 if (!field) {
4002 str = arg->int_array.field->field.name;
4003 field = pevent_find_any_field(event, str);
4004 if (!field)
4005 goto out_warning_field;
4006 arg->int_array.field->field.field = field;
4008 num = data + field->offset;
4010 len = eval_num_arg(data, size, event, arg->int_array.count);
4011 el_size = eval_num_arg(data, size, event,
4012 arg->int_array.el_size);
4013 for (i = 0; i < len; i++) {
4014 if (i)
4015 trace_seq_putc(s, ' ');
4017 if (el_size == 1) {
4018 trace_seq_printf(s, "%u", *(uint8_t *)num);
4019 } else if (el_size == 2) {
4020 trace_seq_printf(s, "%u", *(uint16_t *)num);
4021 } else if (el_size == 4) {
4022 trace_seq_printf(s, "%u", *(uint32_t *)num);
4023 } else if (el_size == 8) {
4024 trace_seq_printf(s, "%"PRIu64, *(uint64_t *)num);
4025 } else {
4026 trace_seq_printf(s, "BAD SIZE:%d 0x%x",
4027 el_size, *(uint8_t *)num);
4028 el_size = 1;
4031 num += el_size;
4033 break;
4035 case PRINT_TYPE:
4036 break;
4037 case PRINT_STRING: {
4038 int str_offset;
4040 if (arg->string.offset == -1) {
4041 struct format_field *f;
4043 f = pevent_find_any_field(event, arg->string.string);
4044 arg->string.offset = f->offset;
4046 str_offset = data2host4(pevent, data + arg->string.offset);
4047 str_offset &= 0xffff;
4048 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
4049 break;
4051 case PRINT_BSTRING:
4052 print_str_to_seq(s, format, len_arg, arg->string.string);
4053 break;
4054 case PRINT_BITMASK: {
4055 int bitmask_offset;
4056 int bitmask_size;
4058 if (arg->bitmask.offset == -1) {
4059 struct format_field *f;
4061 f = pevent_find_any_field(event, arg->bitmask.bitmask);
4062 arg->bitmask.offset = f->offset;
4064 bitmask_offset = data2host4(pevent, data + arg->bitmask.offset);
4065 bitmask_size = bitmask_offset >> 16;
4066 bitmask_offset &= 0xffff;
4067 print_bitmask_to_seq(pevent, s, format, len_arg,
4068 data + bitmask_offset, bitmask_size);
4069 break;
4071 case PRINT_OP:
4073 * The only op for string should be ? :
4075 if (arg->op.op[0] != '?')
4076 return;
4077 val = eval_num_arg(data, size, event, arg->op.left);
4078 if (val)
4079 print_str_arg(s, data, size, event,
4080 format, len_arg, arg->op.right->op.left);
4081 else
4082 print_str_arg(s, data, size, event,
4083 format, len_arg, arg->op.right->op.right);
4084 break;
4085 case PRINT_FUNC:
4086 process_defined_func(s, data, size, event, arg);
4087 break;
4088 default:
4089 /* well... */
4090 break;
4093 return;
4095 out_warning_field:
4096 do_warning_event(event, "%s: field %s not found",
4097 __func__, arg->field.name);
4100 static unsigned long long
4101 process_defined_func(struct trace_seq *s, void *data, int size,
4102 struct event_format *event, struct print_arg *arg)
4104 struct pevent_function_handler *func_handle = arg->func.func;
4105 struct pevent_func_params *param;
4106 unsigned long long *args;
4107 unsigned long long ret;
4108 struct print_arg *farg;
4109 struct trace_seq str;
4110 struct save_str {
4111 struct save_str *next;
4112 char *str;
4113 } *strings = NULL, *string;
4114 int i;
4116 if (!func_handle->nr_args) {
4117 ret = (*func_handle->func)(s, NULL);
4118 goto out;
4121 farg = arg->func.args;
4122 param = func_handle->params;
4124 ret = ULLONG_MAX;
4125 args = malloc(sizeof(*args) * func_handle->nr_args);
4126 if (!args)
4127 goto out;
4129 for (i = 0; i < func_handle->nr_args; i++) {
4130 switch (param->type) {
4131 case PEVENT_FUNC_ARG_INT:
4132 case PEVENT_FUNC_ARG_LONG:
4133 case PEVENT_FUNC_ARG_PTR:
4134 args[i] = eval_num_arg(data, size, event, farg);
4135 break;
4136 case PEVENT_FUNC_ARG_STRING:
4137 trace_seq_init(&str);
4138 print_str_arg(&str, data, size, event, "%s", -1, farg);
4139 trace_seq_terminate(&str);
4140 string = malloc(sizeof(*string));
4141 if (!string) {
4142 do_warning_event(event, "%s(%d): malloc str",
4143 __func__, __LINE__);
4144 goto out_free;
4146 string->next = strings;
4147 string->str = strdup(str.buffer);
4148 if (!string->str) {
4149 free(string);
4150 do_warning_event(event, "%s(%d): malloc str",
4151 __func__, __LINE__);
4152 goto out_free;
4154 args[i] = (uintptr_t)string->str;
4155 strings = string;
4156 trace_seq_destroy(&str);
4157 break;
4158 default:
4160 * Something went totally wrong, this is not
4161 * an input error, something in this code broke.
4163 do_warning_event(event, "Unexpected end of arguments\n");
4164 goto out_free;
4166 farg = farg->next;
4167 param = param->next;
4170 ret = (*func_handle->func)(s, args);
4171 out_free:
4172 free(args);
4173 while (strings) {
4174 string = strings;
4175 strings = string->next;
4176 free(string->str);
4177 free(string);
4180 out:
4181 /* TBD : handle return type here */
4182 return ret;
4185 static void free_args(struct print_arg *args)
4187 struct print_arg *next;
4189 while (args) {
4190 next = args->next;
4192 free_arg(args);
4193 args = next;
4197 static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
4199 struct pevent *pevent = event->pevent;
4200 struct format_field *field, *ip_field;
4201 struct print_arg *args, *arg, **next;
4202 unsigned long long ip, val;
4203 char *ptr;
4204 void *bptr;
4205 int vsize;
4207 field = pevent->bprint_buf_field;
4208 ip_field = pevent->bprint_ip_field;
4210 if (!field) {
4211 field = pevent_find_field(event, "buf");
4212 if (!field) {
4213 do_warning_event(event, "can't find buffer field for binary printk");
4214 return NULL;
4216 ip_field = pevent_find_field(event, "ip");
4217 if (!ip_field) {
4218 do_warning_event(event, "can't find ip field for binary printk");
4219 return NULL;
4221 pevent->bprint_buf_field = field;
4222 pevent->bprint_ip_field = ip_field;
4225 ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
4228 * The first arg is the IP pointer.
4230 args = alloc_arg();
4231 if (!args) {
4232 do_warning_event(event, "%s(%d): not enough memory!",
4233 __func__, __LINE__);
4234 return NULL;
4236 arg = args;
4237 arg->next = NULL;
4238 next = &arg->next;
4240 arg->type = PRINT_ATOM;
4242 if (asprintf(&arg->atom.atom, "%lld", ip) < 0)
4243 goto out_free;
4245 /* skip the first "%ps: " */
4246 for (ptr = fmt + 5, bptr = data + field->offset;
4247 bptr < data + size && *ptr; ptr++) {
4248 int ls = 0;
4250 if (*ptr == '%') {
4251 process_again:
4252 ptr++;
4253 switch (*ptr) {
4254 case '%':
4255 break;
4256 case 'l':
4257 ls++;
4258 goto process_again;
4259 case 'L':
4260 ls = 2;
4261 goto process_again;
4262 case '0' ... '9':
4263 goto process_again;
4264 case '.':
4265 goto process_again;
4266 case 'z':
4267 case 'Z':
4268 ls = 1;
4269 goto process_again;
4270 case 'p':
4271 ls = 1;
4272 /* fall through */
4273 case 'd':
4274 case 'u':
4275 case 'x':
4276 case 'i':
4277 switch (ls) {
4278 case 0:
4279 vsize = 4;
4280 break;
4281 case 1:
4282 vsize = pevent->long_size;
4283 break;
4284 case 2:
4285 vsize = 8;
4286 break;
4287 default:
4288 vsize = ls; /* ? */
4289 break;
4291 /* fall through */
4292 case '*':
4293 if (*ptr == '*')
4294 vsize = 4;
4296 /* the pointers are always 4 bytes aligned */
4297 bptr = (void *)(((unsigned long)bptr + 3) &
4298 ~3);
4299 val = pevent_read_number(pevent, bptr, vsize);
4300 bptr += vsize;
4301 arg = alloc_arg();
4302 if (!arg) {
4303 do_warning_event(event, "%s(%d): not enough memory!",
4304 __func__, __LINE__);
4305 goto out_free;
4307 arg->next = NULL;
4308 arg->type = PRINT_ATOM;
4309 if (asprintf(&arg->atom.atom, "%lld", val) < 0) {
4310 free(arg);
4311 goto out_free;
4313 *next = arg;
4314 next = &arg->next;
4316 * The '*' case means that an arg is used as the length.
4317 * We need to continue to figure out for what.
4319 if (*ptr == '*')
4320 goto process_again;
4322 break;
4323 case 's':
4324 arg = alloc_arg();
4325 if (!arg) {
4326 do_warning_event(event, "%s(%d): not enough memory!",
4327 __func__, __LINE__);
4328 goto out_free;
4330 arg->next = NULL;
4331 arg->type = PRINT_BSTRING;
4332 arg->string.string = strdup(bptr);
4333 if (!arg->string.string)
4334 goto out_free;
4335 bptr += strlen(bptr) + 1;
4336 *next = arg;
4337 next = &arg->next;
4338 default:
4339 break;
4344 return args;
4346 out_free:
4347 free_args(args);
4348 return NULL;
4351 static char *
4352 get_bprint_format(void *data, int size __maybe_unused,
4353 struct event_format *event)
4355 struct pevent *pevent = event->pevent;
4356 unsigned long long addr;
4357 struct format_field *field;
4358 struct printk_map *printk;
4359 char *format;
4361 field = pevent->bprint_fmt_field;
4363 if (!field) {
4364 field = pevent_find_field(event, "fmt");
4365 if (!field) {
4366 do_warning_event(event, "can't find format field for binary printk");
4367 return NULL;
4369 pevent->bprint_fmt_field = field;
4372 addr = pevent_read_number(pevent, data + field->offset, field->size);
4374 printk = find_printk(pevent, addr);
4375 if (!printk) {
4376 if (asprintf(&format, "%%pf: (NO FORMAT FOUND at %llx)\n", addr) < 0)
4377 return NULL;
4378 return format;
4381 if (asprintf(&format, "%s: %s", "%pf", printk->printk) < 0)
4382 return NULL;
4384 return format;
4387 static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
4388 struct event_format *event, struct print_arg *arg)
4390 unsigned char *buf;
4391 const char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
4393 if (arg->type == PRINT_FUNC) {
4394 process_defined_func(s, data, size, event, arg);
4395 return;
4398 if (arg->type != PRINT_FIELD) {
4399 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
4400 arg->type);
4401 return;
4404 if (mac == 'm')
4405 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
4406 if (!arg->field.field) {
4407 arg->field.field =
4408 pevent_find_any_field(event, arg->field.name);
4409 if (!arg->field.field) {
4410 do_warning_event(event, "%s: field %s not found",
4411 __func__, arg->field.name);
4412 return;
4415 if (arg->field.field->size != 6) {
4416 trace_seq_printf(s, "INVALIDMAC");
4417 return;
4419 buf = data + arg->field.field->offset;
4420 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
4423 static void print_ip4_addr(struct trace_seq *s, char i, unsigned char *buf)
4425 const char *fmt;
4427 if (i == 'i')
4428 fmt = "%03d.%03d.%03d.%03d";
4429 else
4430 fmt = "%d.%d.%d.%d";
4432 trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3]);
4435 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
4437 return ((unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
4438 (unsigned long)(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
4441 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
4443 return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
4446 static void print_ip6c_addr(struct trace_seq *s, unsigned char *addr)
4448 int i, j, range;
4449 unsigned char zerolength[8];
4450 int longest = 1;
4451 int colonpos = -1;
4452 uint16_t word;
4453 uint8_t hi, lo;
4454 bool needcolon = false;
4455 bool useIPv4;
4456 struct in6_addr in6;
4458 memcpy(&in6, addr, sizeof(struct in6_addr));
4460 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
4462 memset(zerolength, 0, sizeof(zerolength));
4464 if (useIPv4)
4465 range = 6;
4466 else
4467 range = 8;
4469 /* find position of longest 0 run */
4470 for (i = 0; i < range; i++) {
4471 for (j = i; j < range; j++) {
4472 if (in6.s6_addr16[j] != 0)
4473 break;
4474 zerolength[i]++;
4477 for (i = 0; i < range; i++) {
4478 if (zerolength[i] > longest) {
4479 longest = zerolength[i];
4480 colonpos = i;
4483 if (longest == 1) /* don't compress a single 0 */
4484 colonpos = -1;
4486 /* emit address */
4487 for (i = 0; i < range; i++) {
4488 if (i == colonpos) {
4489 if (needcolon || i == 0)
4490 trace_seq_printf(s, ":");
4491 trace_seq_printf(s, ":");
4492 needcolon = false;
4493 i += longest - 1;
4494 continue;
4496 if (needcolon) {
4497 trace_seq_printf(s, ":");
4498 needcolon = false;
4500 /* hex u16 without leading 0s */
4501 word = ntohs(in6.s6_addr16[i]);
4502 hi = word >> 8;
4503 lo = word & 0xff;
4504 if (hi)
4505 trace_seq_printf(s, "%x%02x", hi, lo);
4506 else
4507 trace_seq_printf(s, "%x", lo);
4509 needcolon = true;
4512 if (useIPv4) {
4513 if (needcolon)
4514 trace_seq_printf(s, ":");
4515 print_ip4_addr(s, 'I', &in6.s6_addr[12]);
4518 return;
4521 static void print_ip6_addr(struct trace_seq *s, char i, unsigned char *buf)
4523 int j;
4525 for (j = 0; j < 16; j += 2) {
4526 trace_seq_printf(s, "%02x%02x", buf[j], buf[j+1]);
4527 if (i == 'I' && j < 14)
4528 trace_seq_printf(s, ":");
4533 * %pi4 print an IPv4 address with leading zeros
4534 * %pI4 print an IPv4 address without leading zeros
4535 * %pi6 print an IPv6 address without colons
4536 * %pI6 print an IPv6 address with colons
4537 * %pI6c print an IPv6 address in compressed form with colons
4538 * %pISpc print an IP address based on sockaddr; p adds port.
4540 static int print_ipv4_arg(struct trace_seq *s, const char *ptr, char i,
4541 void *data, int size, struct event_format *event,
4542 struct print_arg *arg)
4544 unsigned char *buf;
4546 if (arg->type == PRINT_FUNC) {
4547 process_defined_func(s, data, size, event, arg);
4548 return 0;
4551 if (arg->type != PRINT_FIELD) {
4552 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
4553 return 0;
4556 if (!arg->field.field) {
4557 arg->field.field =
4558 pevent_find_any_field(event, arg->field.name);
4559 if (!arg->field.field) {
4560 do_warning("%s: field %s not found",
4561 __func__, arg->field.name);
4562 return 0;
4566 buf = data + arg->field.field->offset;
4568 if (arg->field.field->size != 4) {
4569 trace_seq_printf(s, "INVALIDIPv4");
4570 return 0;
4572 print_ip4_addr(s, i, buf);
4574 return 0;
4577 static int print_ipv6_arg(struct trace_seq *s, const char *ptr, char i,
4578 void *data, int size, struct event_format *event,
4579 struct print_arg *arg)
4581 char have_c = 0;
4582 unsigned char *buf;
4583 int rc = 0;
4585 /* pI6c */
4586 if (i == 'I' && *ptr == 'c') {
4587 have_c = 1;
4588 ptr++;
4589 rc++;
4592 if (arg->type == PRINT_FUNC) {
4593 process_defined_func(s, data, size, event, arg);
4594 return rc;
4597 if (arg->type != PRINT_FIELD) {
4598 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
4599 return rc;
4602 if (!arg->field.field) {
4603 arg->field.field =
4604 pevent_find_any_field(event, arg->field.name);
4605 if (!arg->field.field) {
4606 do_warning("%s: field %s not found",
4607 __func__, arg->field.name);
4608 return rc;
4612 buf = data + arg->field.field->offset;
4614 if (arg->field.field->size != 16) {
4615 trace_seq_printf(s, "INVALIDIPv6");
4616 return rc;
4619 if (have_c)
4620 print_ip6c_addr(s, buf);
4621 else
4622 print_ip6_addr(s, i, buf);
4624 return rc;
4627 static int print_ipsa_arg(struct trace_seq *s, const char *ptr, char i,
4628 void *data, int size, struct event_format *event,
4629 struct print_arg *arg)
4631 char have_c = 0, have_p = 0;
4632 unsigned char *buf;
4633 struct sockaddr_storage *sa;
4634 int rc = 0;
4636 /* pISpc */
4637 if (i == 'I') {
4638 if (*ptr == 'p') {
4639 have_p = 1;
4640 ptr++;
4641 rc++;
4643 if (*ptr == 'c') {
4644 have_c = 1;
4645 ptr++;
4646 rc++;
4650 if (arg->type == PRINT_FUNC) {
4651 process_defined_func(s, data, size, event, arg);
4652 return rc;
4655 if (arg->type != PRINT_FIELD) {
4656 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d", arg->type);
4657 return rc;
4660 if (!arg->field.field) {
4661 arg->field.field =
4662 pevent_find_any_field(event, arg->field.name);
4663 if (!arg->field.field) {
4664 do_warning("%s: field %s not found",
4665 __func__, arg->field.name);
4666 return rc;
4670 sa = (struct sockaddr_storage *) (data + arg->field.field->offset);
4672 if (sa->ss_family == AF_INET) {
4673 struct sockaddr_in *sa4 = (struct sockaddr_in *) sa;
4675 if (arg->field.field->size < sizeof(struct sockaddr_in)) {
4676 trace_seq_printf(s, "INVALIDIPv4");
4677 return rc;
4680 print_ip4_addr(s, i, (unsigned char *) &sa4->sin_addr);
4681 if (have_p)
4682 trace_seq_printf(s, ":%d", ntohs(sa4->sin_port));
4685 } else if (sa->ss_family == AF_INET6) {
4686 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) sa;
4688 if (arg->field.field->size < sizeof(struct sockaddr_in6)) {
4689 trace_seq_printf(s, "INVALIDIPv6");
4690 return rc;
4693 if (have_p)
4694 trace_seq_printf(s, "[");
4696 buf = (unsigned char *) &sa6->sin6_addr;
4697 if (have_c)
4698 print_ip6c_addr(s, buf);
4699 else
4700 print_ip6_addr(s, i, buf);
4702 if (have_p)
4703 trace_seq_printf(s, "]:%d", ntohs(sa6->sin6_port));
4706 return rc;
4709 static int print_ip_arg(struct trace_seq *s, const char *ptr,
4710 void *data, int size, struct event_format *event,
4711 struct print_arg *arg)
4713 char i = *ptr; /* 'i' or 'I' */
4714 char ver;
4715 int rc = 0;
4717 ptr++;
4718 rc++;
4720 ver = *ptr;
4721 ptr++;
4722 rc++;
4724 switch (ver) {
4725 case '4':
4726 rc += print_ipv4_arg(s, ptr, i, data, size, event, arg);
4727 break;
4728 case '6':
4729 rc += print_ipv6_arg(s, ptr, i, data, size, event, arg);
4730 break;
4731 case 'S':
4732 rc += print_ipsa_arg(s, ptr, i, data, size, event, arg);
4733 break;
4734 default:
4735 return 0;
4738 return rc;
4741 static int is_printable_array(char *p, unsigned int len)
4743 unsigned int i;
4745 for (i = 0; i < len && p[i]; i++)
4746 if (!isprint(p[i]) && !isspace(p[i]))
4747 return 0;
4748 return 1;
4751 void pevent_print_field(struct trace_seq *s, void *data,
4752 struct format_field *field)
4754 unsigned long long val;
4755 unsigned int offset, len, i;
4756 struct pevent *pevent = field->event->pevent;
4758 if (field->flags & FIELD_IS_ARRAY) {
4759 offset = field->offset;
4760 len = field->size;
4761 if (field->flags & FIELD_IS_DYNAMIC) {
4762 val = pevent_read_number(pevent, data + offset, len);
4763 offset = val;
4764 len = offset >> 16;
4765 offset &= 0xffff;
4767 if (field->flags & FIELD_IS_STRING &&
4768 is_printable_array(data + offset, len)) {
4769 trace_seq_printf(s, "%s", (char *)data + offset);
4770 } else {
4771 trace_seq_puts(s, "ARRAY[");
4772 for (i = 0; i < len; i++) {
4773 if (i)
4774 trace_seq_puts(s, ", ");
4775 trace_seq_printf(s, "%02x",
4776 *((unsigned char *)data + offset + i));
4778 trace_seq_putc(s, ']');
4779 field->flags &= ~FIELD_IS_STRING;
4781 } else {
4782 val = pevent_read_number(pevent, data + field->offset,
4783 field->size);
4784 if (field->flags & FIELD_IS_POINTER) {
4785 trace_seq_printf(s, "0x%llx", val);
4786 } else if (field->flags & FIELD_IS_SIGNED) {
4787 switch (field->size) {
4788 case 4:
4790 * If field is long then print it in hex.
4791 * A long usually stores pointers.
4793 if (field->flags & FIELD_IS_LONG)
4794 trace_seq_printf(s, "0x%x", (int)val);
4795 else
4796 trace_seq_printf(s, "%d", (int)val);
4797 break;
4798 case 2:
4799 trace_seq_printf(s, "%2d", (short)val);
4800 break;
4801 case 1:
4802 trace_seq_printf(s, "%1d", (char)val);
4803 break;
4804 default:
4805 trace_seq_printf(s, "%lld", val);
4807 } else {
4808 if (field->flags & FIELD_IS_LONG)
4809 trace_seq_printf(s, "0x%llx", val);
4810 else
4811 trace_seq_printf(s, "%llu", val);
4816 void pevent_print_fields(struct trace_seq *s, void *data,
4817 int size __maybe_unused, struct event_format *event)
4819 struct format_field *field;
4821 field = event->format.fields;
4822 while (field) {
4823 trace_seq_printf(s, " %s=", field->name);
4824 pevent_print_field(s, data, field);
4825 field = field->next;
4829 static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
4831 struct pevent *pevent = event->pevent;
4832 struct print_fmt *print_fmt = &event->print_fmt;
4833 struct print_arg *arg = print_fmt->args;
4834 struct print_arg *args = NULL;
4835 const char *ptr = print_fmt->format;
4836 unsigned long long val;
4837 struct func_map *func;
4838 const char *saveptr;
4839 struct trace_seq p;
4840 char *bprint_fmt = NULL;
4841 char format[32];
4842 int show_func;
4843 int len_as_arg;
4844 int len_arg;
4845 int len;
4846 int ls;
4848 if (event->flags & EVENT_FL_FAILED) {
4849 trace_seq_printf(s, "[FAILED TO PARSE]");
4850 pevent_print_fields(s, data, size, event);
4851 return;
4854 if (event->flags & EVENT_FL_ISBPRINT) {
4855 bprint_fmt = get_bprint_format(data, size, event);
4856 args = make_bprint_args(bprint_fmt, data, size, event);
4857 arg = args;
4858 ptr = bprint_fmt;
4861 for (; *ptr; ptr++) {
4862 ls = 0;
4863 if (*ptr == '\\') {
4864 ptr++;
4865 switch (*ptr) {
4866 case 'n':
4867 trace_seq_putc(s, '\n');
4868 break;
4869 case 't':
4870 trace_seq_putc(s, '\t');
4871 break;
4872 case 'r':
4873 trace_seq_putc(s, '\r');
4874 break;
4875 case '\\':
4876 trace_seq_putc(s, '\\');
4877 break;
4878 default:
4879 trace_seq_putc(s, *ptr);
4880 break;
4883 } else if (*ptr == '%') {
4884 saveptr = ptr;
4885 show_func = 0;
4886 len_as_arg = 0;
4887 cont_process:
4888 ptr++;
4889 switch (*ptr) {
4890 case '%':
4891 trace_seq_putc(s, '%');
4892 break;
4893 case '#':
4894 /* FIXME: need to handle properly */
4895 goto cont_process;
4896 case 'h':
4897 ls--;
4898 goto cont_process;
4899 case 'l':
4900 ls++;
4901 goto cont_process;
4902 case 'L':
4903 ls = 2;
4904 goto cont_process;
4905 case '*':
4906 /* The argument is the length. */
4907 if (!arg) {
4908 do_warning_event(event, "no argument match");
4909 event->flags |= EVENT_FL_FAILED;
4910 goto out_failed;
4912 len_arg = eval_num_arg(data, size, event, arg);
4913 len_as_arg = 1;
4914 arg = arg->next;
4915 goto cont_process;
4916 case '.':
4917 case 'z':
4918 case 'Z':
4919 case '0' ... '9':
4920 case '-':
4921 goto cont_process;
4922 case 'p':
4923 if (pevent->long_size == 4)
4924 ls = 1;
4925 else
4926 ls = 2;
4928 if (*(ptr+1) == 'F' || *(ptr+1) == 'f' ||
4929 *(ptr+1) == 'S' || *(ptr+1) == 's') {
4930 ptr++;
4931 show_func = *ptr;
4932 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
4933 print_mac_arg(s, *(ptr+1), data, size, event, arg);
4934 ptr++;
4935 arg = arg->next;
4936 break;
4937 } else if (*(ptr+1) == 'I' || *(ptr+1) == 'i') {
4938 int n;
4940 n = print_ip_arg(s, ptr+1, data, size, event, arg);
4941 if (n > 0) {
4942 ptr += n;
4943 arg = arg->next;
4944 break;
4948 /* fall through */
4949 case 'd':
4950 case 'i':
4951 case 'x':
4952 case 'X':
4953 case 'u':
4954 if (!arg) {
4955 do_warning_event(event, "no argument match");
4956 event->flags |= EVENT_FL_FAILED;
4957 goto out_failed;
4960 len = ((unsigned long)ptr + 1) -
4961 (unsigned long)saveptr;
4963 /* should never happen */
4964 if (len > 31) {
4965 do_warning_event(event, "bad format!");
4966 event->flags |= EVENT_FL_FAILED;
4967 len = 31;
4970 memcpy(format, saveptr, len);
4971 format[len] = 0;
4973 val = eval_num_arg(data, size, event, arg);
4974 arg = arg->next;
4976 if (show_func) {
4977 func = find_func(pevent, val);
4978 if (func) {
4979 trace_seq_puts(s, func->func);
4980 if (show_func == 'F')
4981 trace_seq_printf(s,
4982 "+0x%llx",
4983 val - func->addr);
4984 break;
4987 if (pevent->long_size == 8 && ls == 1 &&
4988 sizeof(long) != 8) {
4989 char *p;
4991 /* make %l into %ll */
4992 if (ls == 1 && (p = strchr(format, 'l')))
4993 memmove(p+1, p, strlen(p)+1);
4994 else if (strcmp(format, "%p") == 0)
4995 strcpy(format, "0x%llx");
4996 ls = 2;
4998 switch (ls) {
4999 case -2:
5000 if (len_as_arg)
5001 trace_seq_printf(s, format, len_arg, (char)val);
5002 else
5003 trace_seq_printf(s, format, (char)val);
5004 break;
5005 case -1:
5006 if (len_as_arg)
5007 trace_seq_printf(s, format, len_arg, (short)val);
5008 else
5009 trace_seq_printf(s, format, (short)val);
5010 break;
5011 case 0:
5012 if (len_as_arg)
5013 trace_seq_printf(s, format, len_arg, (int)val);
5014 else
5015 trace_seq_printf(s, format, (int)val);
5016 break;
5017 case 1:
5018 if (len_as_arg)
5019 trace_seq_printf(s, format, len_arg, (long)val);
5020 else
5021 trace_seq_printf(s, format, (long)val);
5022 break;
5023 case 2:
5024 if (len_as_arg)
5025 trace_seq_printf(s, format, len_arg,
5026 (long long)val);
5027 else
5028 trace_seq_printf(s, format, (long long)val);
5029 break;
5030 default:
5031 do_warning_event(event, "bad count (%d)", ls);
5032 event->flags |= EVENT_FL_FAILED;
5034 break;
5035 case 's':
5036 if (!arg) {
5037 do_warning_event(event, "no matching argument");
5038 event->flags |= EVENT_FL_FAILED;
5039 goto out_failed;
5042 len = ((unsigned long)ptr + 1) -
5043 (unsigned long)saveptr;
5045 /* should never happen */
5046 if (len > 31) {
5047 do_warning_event(event, "bad format!");
5048 event->flags |= EVENT_FL_FAILED;
5049 len = 31;
5052 memcpy(format, saveptr, len);
5053 format[len] = 0;
5054 if (!len_as_arg)
5055 len_arg = -1;
5056 /* Use helper trace_seq */
5057 trace_seq_init(&p);
5058 print_str_arg(&p, data, size, event,
5059 format, len_arg, arg);
5060 trace_seq_terminate(&p);
5061 trace_seq_puts(s, p.buffer);
5062 trace_seq_destroy(&p);
5063 arg = arg->next;
5064 break;
5065 default:
5066 trace_seq_printf(s, ">%c<", *ptr);
5069 } else
5070 trace_seq_putc(s, *ptr);
5073 if (event->flags & EVENT_FL_FAILED) {
5074 out_failed:
5075 trace_seq_printf(s, "[FAILED TO PARSE]");
5078 if (args) {
5079 free_args(args);
5080 free(bprint_fmt);
5085 * pevent_data_lat_fmt - parse the data for the latency format
5086 * @pevent: a handle to the pevent
5087 * @s: the trace_seq to write to
5088 * @record: the record to read from
5090 * This parses out the Latency format (interrupts disabled,
5091 * need rescheduling, in hard/soft interrupt, preempt count
5092 * and lock depth) and places it into the trace_seq.
5094 void pevent_data_lat_fmt(struct pevent *pevent,
5095 struct trace_seq *s, struct pevent_record *record)
5097 static int check_lock_depth = 1;
5098 static int check_migrate_disable = 1;
5099 static int lock_depth_exists;
5100 static int migrate_disable_exists;
5101 unsigned int lat_flags;
5102 unsigned int pc;
5103 int lock_depth;
5104 int migrate_disable;
5105 int hardirq;
5106 int softirq;
5107 void *data = record->data;
5109 lat_flags = parse_common_flags(pevent, data);
5110 pc = parse_common_pc(pevent, data);
5111 /* lock_depth may not always exist */
5112 if (lock_depth_exists)
5113 lock_depth = parse_common_lock_depth(pevent, data);
5114 else if (check_lock_depth) {
5115 lock_depth = parse_common_lock_depth(pevent, data);
5116 if (lock_depth < 0)
5117 check_lock_depth = 0;
5118 else
5119 lock_depth_exists = 1;
5122 /* migrate_disable may not always exist */
5123 if (migrate_disable_exists)
5124 migrate_disable = parse_common_migrate_disable(pevent, data);
5125 else if (check_migrate_disable) {
5126 migrate_disable = parse_common_migrate_disable(pevent, data);
5127 if (migrate_disable < 0)
5128 check_migrate_disable = 0;
5129 else
5130 migrate_disable_exists = 1;
5133 hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
5134 softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
5136 trace_seq_printf(s, "%c%c%c",
5137 (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
5138 (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
5139 'X' : '.',
5140 (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
5141 'N' : '.',
5142 (hardirq && softirq) ? 'H' :
5143 hardirq ? 'h' : softirq ? 's' : '.');
5145 if (pc)
5146 trace_seq_printf(s, "%x", pc);
5147 else
5148 trace_seq_putc(s, '.');
5150 if (migrate_disable_exists) {
5151 if (migrate_disable < 0)
5152 trace_seq_putc(s, '.');
5153 else
5154 trace_seq_printf(s, "%d", migrate_disable);
5157 if (lock_depth_exists) {
5158 if (lock_depth < 0)
5159 trace_seq_putc(s, '.');
5160 else
5161 trace_seq_printf(s, "%d", lock_depth);
5164 trace_seq_terminate(s);
5168 * pevent_data_type - parse out the given event type
5169 * @pevent: a handle to the pevent
5170 * @rec: the record to read from
5172 * This returns the event id from the @rec.
5174 int pevent_data_type(struct pevent *pevent, struct pevent_record *rec)
5176 return trace_parse_common_type(pevent, rec->data);
5180 * pevent_data_event_from_type - find the event by a given type
5181 * @pevent: a handle to the pevent
5182 * @type: the type of the event.
5184 * This returns the event form a given @type;
5186 struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
5188 return pevent_find_event(pevent, type);
5192 * pevent_data_pid - parse the PID from raw data
5193 * @pevent: a handle to the pevent
5194 * @rec: the record to parse
5196 * This returns the PID from a raw data.
5198 int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec)
5200 return parse_common_pid(pevent, rec->data);
5204 * pevent_data_comm_from_pid - return the command line from PID
5205 * @pevent: a handle to the pevent
5206 * @pid: the PID of the task to search for
5208 * This returns a pointer to the command line that has the given
5209 * @pid.
5211 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
5213 const char *comm;
5215 comm = find_cmdline(pevent, pid);
5216 return comm;
5219 static struct cmdline *
5220 pid_from_cmdlist(struct pevent *pevent, const char *comm, struct cmdline *next)
5222 struct cmdline_list *cmdlist = (struct cmdline_list *)next;
5224 if (cmdlist)
5225 cmdlist = cmdlist->next;
5226 else
5227 cmdlist = pevent->cmdlist;
5229 while (cmdlist && strcmp(cmdlist->comm, comm) != 0)
5230 cmdlist = cmdlist->next;
5232 return (struct cmdline *)cmdlist;
5236 * pevent_data_pid_from_comm - return the pid from a given comm
5237 * @pevent: a handle to the pevent
5238 * @comm: the cmdline to find the pid from
5239 * @next: the cmdline structure to find the next comm
5241 * This returns the cmdline structure that holds a pid for a given
5242 * comm, or NULL if none found. As there may be more than one pid for
5243 * a given comm, the result of this call can be passed back into
5244 * a recurring call in the @next paramater, and then it will find the
5245 * next pid.
5246 * Also, it does a linear seach, so it may be slow.
5248 struct cmdline *pevent_data_pid_from_comm(struct pevent *pevent, const char *comm,
5249 struct cmdline *next)
5251 struct cmdline *cmdline;
5254 * If the cmdlines have not been converted yet, then use
5255 * the list.
5257 if (!pevent->cmdlines)
5258 return pid_from_cmdlist(pevent, comm, next);
5260 if (next) {
5262 * The next pointer could have been still from
5263 * a previous call before cmdlines were created
5265 if (next < pevent->cmdlines ||
5266 next >= pevent->cmdlines + pevent->cmdline_count)
5267 next = NULL;
5268 else
5269 cmdline = next++;
5272 if (!next)
5273 cmdline = pevent->cmdlines;
5275 while (cmdline < pevent->cmdlines + pevent->cmdline_count) {
5276 if (strcmp(cmdline->comm, comm) == 0)
5277 return cmdline;
5278 cmdline++;
5280 return NULL;
5284 * pevent_cmdline_pid - return the pid associated to a given cmdline
5285 * @cmdline: The cmdline structure to get the pid from
5287 * Returns the pid for a give cmdline. If @cmdline is NULL, then
5288 * -1 is returned.
5290 int pevent_cmdline_pid(struct pevent *pevent, struct cmdline *cmdline)
5292 struct cmdline_list *cmdlist = (struct cmdline_list *)cmdline;
5294 if (!cmdline)
5295 return -1;
5298 * If cmdlines have not been created yet, or cmdline is
5299 * not part of the array, then treat it as a cmdlist instead.
5301 if (!pevent->cmdlines ||
5302 cmdline < pevent->cmdlines ||
5303 cmdline >= pevent->cmdlines + pevent->cmdline_count)
5304 return cmdlist->pid;
5306 return cmdline->pid;
5310 * pevent_data_comm_from_pid - parse the data into the print format
5311 * @s: the trace_seq to write to
5312 * @event: the handle to the event
5313 * @record: the record to read from
5315 * This parses the raw @data using the given @event information and
5316 * writes the print format into the trace_seq.
5318 void pevent_event_info(struct trace_seq *s, struct event_format *event,
5319 struct pevent_record *record)
5321 int print_pretty = 1;
5323 if (event->pevent->print_raw || (event->flags & EVENT_FL_PRINTRAW))
5324 pevent_print_fields(s, record->data, record->size, event);
5325 else {
5327 if (event->handler && !(event->flags & EVENT_FL_NOHANDLE))
5328 print_pretty = event->handler(s, record, event,
5329 event->context);
5331 if (print_pretty)
5332 pretty_print(s, record->data, record->size, event);
5335 trace_seq_terminate(s);
5338 static bool is_timestamp_in_us(char *trace_clock, bool use_trace_clock)
5340 if (!use_trace_clock)
5341 return true;
5343 if (!strcmp(trace_clock, "local") || !strcmp(trace_clock, "global")
5344 || !strcmp(trace_clock, "uptime") || !strcmp(trace_clock, "perf"))
5345 return true;
5347 /* trace_clock is setting in tsc or counter mode */
5348 return false;
5352 * pevent_find_event_by_record - return the event from a given record
5353 * @pevent: a handle to the pevent
5354 * @record: The record to get the event from
5356 * Returns the associated event for a given record, or NULL if non is
5357 * is found.
5359 struct event_format *
5360 pevent_find_event_by_record(struct pevent *pevent, struct pevent_record *record)
5362 int type;
5364 if (record->size < 0) {
5365 do_warning("ug! negative record size %d", record->size);
5366 return NULL;
5369 type = trace_parse_common_type(pevent, record->data);
5371 return pevent_find_event(pevent, type);
5375 * pevent_print_event_task - Write the event task comm, pid and CPU
5376 * @pevent: a handle to the pevent
5377 * @s: the trace_seq to write to
5378 * @event: the handle to the record's event
5379 * @record: The record to get the event from
5381 * Writes the tasks comm, pid and CPU to @s.
5383 void pevent_print_event_task(struct pevent *pevent, struct trace_seq *s,
5384 struct event_format *event,
5385 struct pevent_record *record)
5387 void *data = record->data;
5388 const char *comm;
5389 int pid;
5391 pid = parse_common_pid(pevent, data);
5392 comm = find_cmdline(pevent, pid);
5394 if (pevent->latency_format) {
5395 trace_seq_printf(s, "%8.8s-%-5d %3d",
5396 comm, pid, record->cpu);
5397 } else
5398 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
5402 * pevent_print_event_time - Write the event timestamp
5403 * @pevent: a handle to the pevent
5404 * @s: the trace_seq to write to
5405 * @event: the handle to the record's event
5406 * @record: The record to get the event from
5407 * @use_trace_clock: Set to parse according to the @pevent->trace_clock
5409 * Writes the timestamp of the record into @s.
5411 void pevent_print_event_time(struct pevent *pevent, struct trace_seq *s,
5412 struct event_format *event,
5413 struct pevent_record *record,
5414 bool use_trace_clock)
5416 unsigned long secs;
5417 unsigned long usecs;
5418 unsigned long nsecs;
5419 int p;
5420 bool use_usec_format;
5422 use_usec_format = is_timestamp_in_us(pevent->trace_clock,
5423 use_trace_clock);
5424 if (use_usec_format) {
5425 secs = record->ts / NSECS_PER_SEC;
5426 nsecs = record->ts - secs * NSECS_PER_SEC;
5429 if (pevent->latency_format) {
5430 pevent_data_lat_fmt(pevent, s, record);
5433 if (use_usec_format) {
5434 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
5435 usecs = nsecs;
5436 p = 9;
5437 } else {
5438 usecs = (nsecs + 500) / NSECS_PER_USEC;
5439 /* To avoid usecs larger than 1 sec */
5440 if (usecs >= 1000000) {
5441 usecs -= 1000000;
5442 secs++;
5444 p = 6;
5447 trace_seq_printf(s, " %5lu.%0*lu:", secs, p, usecs);
5448 } else
5449 trace_seq_printf(s, " %12llu:", record->ts);
5453 * pevent_print_event_data - Write the event data section
5454 * @pevent: a handle to the pevent
5455 * @s: the trace_seq to write to
5456 * @event: the handle to the record's event
5457 * @record: The record to get the event from
5459 * Writes the parsing of the record's data to @s.
5461 void pevent_print_event_data(struct pevent *pevent, struct trace_seq *s,
5462 struct event_format *event,
5463 struct pevent_record *record)
5465 static const char *spaces = " "; /* 20 spaces */
5466 int len;
5468 trace_seq_printf(s, " %s: ", event->name);
5470 /* Space out the event names evenly. */
5471 len = strlen(event->name);
5472 if (len < 20)
5473 trace_seq_printf(s, "%.*s", 20 - len, spaces);
5475 pevent_event_info(s, event, record);
5478 void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
5479 struct pevent_record *record, bool use_trace_clock)
5481 struct event_format *event;
5483 event = pevent_find_event_by_record(pevent, record);
5484 if (!event) {
5485 do_warning("ug! no event found for type %d",
5486 trace_parse_common_type(pevent, record->data));
5487 return;
5490 pevent_print_event_task(pevent, s, event, record);
5491 pevent_print_event_time(pevent, s, event, record, use_trace_clock);
5492 pevent_print_event_data(pevent, s, event, record);
5495 static int events_id_cmp(const void *a, const void *b)
5497 struct event_format * const * ea = a;
5498 struct event_format * const * eb = b;
5500 if ((*ea)->id < (*eb)->id)
5501 return -1;
5503 if ((*ea)->id > (*eb)->id)
5504 return 1;
5506 return 0;
5509 static int events_name_cmp(const void *a, const void *b)
5511 struct event_format * const * ea = a;
5512 struct event_format * const * eb = b;
5513 int res;
5515 res = strcmp((*ea)->name, (*eb)->name);
5516 if (res)
5517 return res;
5519 res = strcmp((*ea)->system, (*eb)->system);
5520 if (res)
5521 return res;
5523 return events_id_cmp(a, b);
5526 static int events_system_cmp(const void *a, const void *b)
5528 struct event_format * const * ea = a;
5529 struct event_format * const * eb = b;
5530 int res;
5532 res = strcmp((*ea)->system, (*eb)->system);
5533 if (res)
5534 return res;
5536 res = strcmp((*ea)->name, (*eb)->name);
5537 if (res)
5538 return res;
5540 return events_id_cmp(a, b);
5543 struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
5545 struct event_format **events;
5546 int (*sort)(const void *a, const void *b);
5548 events = pevent->sort_events;
5550 if (events && pevent->last_type == sort_type)
5551 return events;
5553 if (!events) {
5554 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
5555 if (!events)
5556 return NULL;
5558 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
5559 events[pevent->nr_events] = NULL;
5561 pevent->sort_events = events;
5563 /* the internal events are sorted by id */
5564 if (sort_type == EVENT_SORT_ID) {
5565 pevent->last_type = sort_type;
5566 return events;
5570 switch (sort_type) {
5571 case EVENT_SORT_ID:
5572 sort = events_id_cmp;
5573 break;
5574 case EVENT_SORT_NAME:
5575 sort = events_name_cmp;
5576 break;
5577 case EVENT_SORT_SYSTEM:
5578 sort = events_system_cmp;
5579 break;
5580 default:
5581 return events;
5584 qsort(events, pevent->nr_events, sizeof(*events), sort);
5585 pevent->last_type = sort_type;
5587 return events;
5590 static struct format_field **
5591 get_event_fields(const char *type, const char *name,
5592 int count, struct format_field *list)
5594 struct format_field **fields;
5595 struct format_field *field;
5596 int i = 0;
5598 fields = malloc(sizeof(*fields) * (count + 1));
5599 if (!fields)
5600 return NULL;
5602 for (field = list; field; field = field->next) {
5603 fields[i++] = field;
5604 if (i == count + 1) {
5605 do_warning("event %s has more %s fields than specified",
5606 name, type);
5607 i--;
5608 break;
5612 if (i != count)
5613 do_warning("event %s has less %s fields than specified",
5614 name, type);
5616 fields[i] = NULL;
5618 return fields;
5622 * pevent_event_common_fields - return a list of common fields for an event
5623 * @event: the event to return the common fields of.
5625 * Returns an allocated array of fields. The last item in the array is NULL.
5626 * The array must be freed with free().
5628 struct format_field **pevent_event_common_fields(struct event_format *event)
5630 return get_event_fields("common", event->name,
5631 event->format.nr_common,
5632 event->format.common_fields);
5636 * pevent_event_fields - return a list of event specific fields for an event
5637 * @event: the event to return the fields of.
5639 * Returns an allocated array of fields. The last item in the array is NULL.
5640 * The array must be freed with free().
5642 struct format_field **pevent_event_fields(struct event_format *event)
5644 return get_event_fields("event", event->name,
5645 event->format.nr_fields,
5646 event->format.fields);
5649 static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
5651 trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
5652 if (field->next) {
5653 trace_seq_puts(s, ", ");
5654 print_fields(s, field->next);
5658 /* for debugging */
5659 static void print_args(struct print_arg *args)
5661 int print_paren = 1;
5662 struct trace_seq s;
5664 switch (args->type) {
5665 case PRINT_NULL:
5666 printf("null");
5667 break;
5668 case PRINT_ATOM:
5669 printf("%s", args->atom.atom);
5670 break;
5671 case PRINT_FIELD:
5672 printf("REC->%s", args->field.name);
5673 break;
5674 case PRINT_FLAGS:
5675 printf("__print_flags(");
5676 print_args(args->flags.field);
5677 printf(", %s, ", args->flags.delim);
5678 trace_seq_init(&s);
5679 print_fields(&s, args->flags.flags);
5680 trace_seq_do_printf(&s);
5681 trace_seq_destroy(&s);
5682 printf(")");
5683 break;
5684 case PRINT_SYMBOL:
5685 printf("__print_symbolic(");
5686 print_args(args->symbol.field);
5687 printf(", ");
5688 trace_seq_init(&s);
5689 print_fields(&s, args->symbol.symbols);
5690 trace_seq_do_printf(&s);
5691 trace_seq_destroy(&s);
5692 printf(")");
5693 break;
5694 case PRINT_HEX:
5695 printf("__print_hex(");
5696 print_args(args->hex.field);
5697 printf(", ");
5698 print_args(args->hex.size);
5699 printf(")");
5700 break;
5701 case PRINT_INT_ARRAY:
5702 printf("__print_array(");
5703 print_args(args->int_array.field);
5704 printf(", ");
5705 print_args(args->int_array.count);
5706 printf(", ");
5707 print_args(args->int_array.el_size);
5708 printf(")");
5709 break;
5710 case PRINT_STRING:
5711 case PRINT_BSTRING:
5712 printf("__get_str(%s)", args->string.string);
5713 break;
5714 case PRINT_BITMASK:
5715 printf("__get_bitmask(%s)", args->bitmask.bitmask);
5716 break;
5717 case PRINT_TYPE:
5718 printf("(%s)", args->typecast.type);
5719 print_args(args->typecast.item);
5720 break;
5721 case PRINT_OP:
5722 if (strcmp(args->op.op, ":") == 0)
5723 print_paren = 0;
5724 if (print_paren)
5725 printf("(");
5726 print_args(args->op.left);
5727 printf(" %s ", args->op.op);
5728 print_args(args->op.right);
5729 if (print_paren)
5730 printf(")");
5731 break;
5732 default:
5733 /* we should warn... */
5734 return;
5736 if (args->next) {
5737 printf("\n");
5738 print_args(args->next);
5742 static void parse_header_field(const char *field,
5743 int *offset, int *size, int mandatory)
5745 unsigned long long save_input_buf_ptr;
5746 unsigned long long save_input_buf_siz;
5747 char *token;
5748 int type;
5750 save_input_buf_ptr = input_buf_ptr;
5751 save_input_buf_siz = input_buf_siz;
5753 if (read_expected(EVENT_ITEM, "field") < 0)
5754 return;
5755 if (read_expected(EVENT_OP, ":") < 0)
5756 return;
5758 /* type */
5759 if (read_expect_type(EVENT_ITEM, &token) < 0)
5760 goto fail;
5761 free_token(token);
5764 * If this is not a mandatory field, then test it first.
5766 if (mandatory) {
5767 if (read_expected(EVENT_ITEM, field) < 0)
5768 return;
5769 } else {
5770 if (read_expect_type(EVENT_ITEM, &token) < 0)
5771 goto fail;
5772 if (strcmp(token, field) != 0)
5773 goto discard;
5774 free_token(token);
5777 if (read_expected(EVENT_OP, ";") < 0)
5778 return;
5779 if (read_expected(EVENT_ITEM, "offset") < 0)
5780 return;
5781 if (read_expected(EVENT_OP, ":") < 0)
5782 return;
5783 if (read_expect_type(EVENT_ITEM, &token) < 0)
5784 goto fail;
5785 *offset = atoi(token);
5786 free_token(token);
5787 if (read_expected(EVENT_OP, ";") < 0)
5788 return;
5789 if (read_expected(EVENT_ITEM, "size") < 0)
5790 return;
5791 if (read_expected(EVENT_OP, ":") < 0)
5792 return;
5793 if (read_expect_type(EVENT_ITEM, &token) < 0)
5794 goto fail;
5795 *size = atoi(token);
5796 free_token(token);
5797 if (read_expected(EVENT_OP, ";") < 0)
5798 return;
5799 type = read_token(&token);
5800 if (type != EVENT_NEWLINE) {
5801 /* newer versions of the kernel have a "signed" type */
5802 if (type != EVENT_ITEM)
5803 goto fail;
5805 if (strcmp(token, "signed") != 0)
5806 goto fail;
5808 free_token(token);
5810 if (read_expected(EVENT_OP, ":") < 0)
5811 return;
5813 if (read_expect_type(EVENT_ITEM, &token))
5814 goto fail;
5816 free_token(token);
5817 if (read_expected(EVENT_OP, ";") < 0)
5818 return;
5820 if (read_expect_type(EVENT_NEWLINE, &token))
5821 goto fail;
5823 fail:
5824 free_token(token);
5825 return;
5827 discard:
5828 input_buf_ptr = save_input_buf_ptr;
5829 input_buf_siz = save_input_buf_siz;
5830 *offset = 0;
5831 *size = 0;
5832 free_token(token);
5836 * pevent_parse_header_page - parse the data stored in the header page
5837 * @pevent: the handle to the pevent
5838 * @buf: the buffer storing the header page format string
5839 * @size: the size of @buf
5840 * @long_size: the long size to use if there is no header
5842 * This parses the header page format for information on the
5843 * ring buffer used. The @buf should be copied from
5845 * /sys/kernel/debug/tracing/events/header_page
5847 int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
5848 int long_size)
5850 int ignore;
5852 if (!size) {
5854 * Old kernels did not have header page info.
5855 * Sorry but we just use what we find here in user space.
5857 pevent->header_page_ts_size = sizeof(long long);
5858 pevent->header_page_size_size = long_size;
5859 pevent->header_page_data_offset = sizeof(long long) + long_size;
5860 pevent->old_format = 1;
5861 return -1;
5863 init_input_buf(buf, size);
5865 parse_header_field("timestamp", &pevent->header_page_ts_offset,
5866 &pevent->header_page_ts_size, 1);
5867 parse_header_field("commit", &pevent->header_page_size_offset,
5868 &pevent->header_page_size_size, 1);
5869 parse_header_field("overwrite", &pevent->header_page_overwrite,
5870 &ignore, 0);
5871 parse_header_field("data", &pevent->header_page_data_offset,
5872 &pevent->header_page_data_size, 1);
5874 return 0;
5877 static int event_matches(struct event_format *event,
5878 int id, const char *sys_name,
5879 const char *event_name)
5881 if (id >= 0 && id != event->id)
5882 return 0;
5884 if (event_name && (strcmp(event_name, event->name) != 0))
5885 return 0;
5887 if (sys_name && (strcmp(sys_name, event->system) != 0))
5888 return 0;
5890 return 1;
5893 static void free_handler(struct event_handler *handle)
5895 free((void *)handle->sys_name);
5896 free((void *)handle->event_name);
5897 free(handle);
5900 static int find_event_handle(struct pevent *pevent, struct event_format *event)
5902 struct event_handler *handle, **next;
5904 for (next = &pevent->handlers; *next;
5905 next = &(*next)->next) {
5906 handle = *next;
5907 if (event_matches(event, handle->id,
5908 handle->sys_name,
5909 handle->event_name))
5910 break;
5913 if (!(*next))
5914 return 0;
5916 pr_stat("overriding event (%d) %s:%s with new print handler",
5917 event->id, event->system, event->name);
5919 event->handler = handle->func;
5920 event->context = handle->context;
5922 *next = handle->next;
5923 free_handler(handle);
5925 return 1;
5929 * __pevent_parse_format - parse the event format
5930 * @buf: the buffer storing the event format string
5931 * @size: the size of @buf
5932 * @sys: the system the event belongs to
5934 * This parses the event format and creates an event structure
5935 * to quickly parse raw data for a given event.
5937 * These files currently come from:
5939 * /sys/kernel/debug/tracing/events/.../.../format
5941 enum pevent_errno __pevent_parse_format(struct event_format **eventp,
5942 struct pevent *pevent, const char *buf,
5943 unsigned long size, const char *sys)
5945 struct event_format *event;
5946 int ret;
5948 init_input_buf(buf, size);
5950 *eventp = event = alloc_event();
5951 if (!event)
5952 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5954 event->name = event_read_name();
5955 if (!event->name) {
5956 /* Bad event? */
5957 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5958 goto event_alloc_failed;
5961 if (strcmp(sys, "ftrace") == 0) {
5962 event->flags |= EVENT_FL_ISFTRACE;
5964 if (strcmp(event->name, "bprint") == 0)
5965 event->flags |= EVENT_FL_ISBPRINT;
5968 event->id = event_read_id();
5969 if (event->id < 0) {
5970 ret = PEVENT_ERRNO__READ_ID_FAILED;
5972 * This isn't an allocation error actually.
5973 * But as the ID is critical, just bail out.
5975 goto event_alloc_failed;
5978 event->system = strdup(sys);
5979 if (!event->system) {
5980 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5981 goto event_alloc_failed;
5984 /* Add pevent to event so that it can be referenced */
5985 event->pevent = pevent;
5987 ret = event_read_format(event);
5988 if (ret < 0) {
5989 ret = PEVENT_ERRNO__READ_FORMAT_FAILED;
5990 goto event_parse_failed;
5994 * If the event has an override, don't print warnings if the event
5995 * print format fails to parse.
5997 if (pevent && find_event_handle(pevent, event))
5998 show_warning = 0;
6000 ret = event_read_print(event);
6001 show_warning = 1;
6003 if (ret < 0) {
6004 ret = PEVENT_ERRNO__READ_PRINT_FAILED;
6005 goto event_parse_failed;
6008 if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
6009 struct format_field *field;
6010 struct print_arg *arg, **list;
6012 /* old ftrace had no args */
6013 list = &event->print_fmt.args;
6014 for (field = event->format.fields; field; field = field->next) {
6015 arg = alloc_arg();
6016 if (!arg) {
6017 event->flags |= EVENT_FL_FAILED;
6018 return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
6020 arg->type = PRINT_FIELD;
6021 arg->field.name = strdup(field->name);
6022 if (!arg->field.name) {
6023 event->flags |= EVENT_FL_FAILED;
6024 free_arg(arg);
6025 return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
6027 arg->field.field = field;
6028 *list = arg;
6029 list = &arg->next;
6031 return 0;
6034 return 0;
6036 event_parse_failed:
6037 event->flags |= EVENT_FL_FAILED;
6038 return ret;
6040 event_alloc_failed:
6041 free(event->system);
6042 free(event->name);
6043 free(event);
6044 *eventp = NULL;
6045 return ret;
6048 static enum pevent_errno
6049 __pevent_parse_event(struct pevent *pevent,
6050 struct event_format **eventp,
6051 const char *buf, unsigned long size,
6052 const char *sys)
6054 int ret = __pevent_parse_format(eventp, pevent, buf, size, sys);
6055 struct event_format *event = *eventp;
6057 if (event == NULL)
6058 return ret;
6060 if (pevent && add_event(pevent, event)) {
6061 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
6062 goto event_add_failed;
6065 #define PRINT_ARGS 0
6066 if (PRINT_ARGS && event->print_fmt.args)
6067 print_args(event->print_fmt.args);
6069 return 0;
6071 event_add_failed:
6072 pevent_free_format(event);
6073 return ret;
6077 * pevent_parse_format - parse the event format
6078 * @pevent: the handle to the pevent
6079 * @eventp: returned format
6080 * @buf: the buffer storing the event format string
6081 * @size: the size of @buf
6082 * @sys: the system the event belongs to
6084 * This parses the event format and creates an event structure
6085 * to quickly parse raw data for a given event.
6087 * These files currently come from:
6089 * /sys/kernel/debug/tracing/events/.../.../format
6091 enum pevent_errno pevent_parse_format(struct pevent *pevent,
6092 struct event_format **eventp,
6093 const char *buf,
6094 unsigned long size, const char *sys)
6096 return __pevent_parse_event(pevent, eventp, buf, size, sys);
6100 * pevent_parse_event - parse the event format
6101 * @pevent: the handle to the pevent
6102 * @buf: the buffer storing the event format string
6103 * @size: the size of @buf
6104 * @sys: the system the event belongs to
6106 * This parses the event format and creates an event structure
6107 * to quickly parse raw data for a given event.
6109 * These files currently come from:
6111 * /sys/kernel/debug/tracing/events/.../.../format
6113 enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf,
6114 unsigned long size, const char *sys)
6116 struct event_format *event = NULL;
6117 return __pevent_parse_event(pevent, &event, buf, size, sys);
6120 #undef _PE
6121 #define _PE(code, str) str
6122 static const char * const pevent_error_str[] = {
6123 PEVENT_ERRORS
6125 #undef _PE
6127 int pevent_strerror(struct pevent *pevent __maybe_unused,
6128 enum pevent_errno errnum, char *buf, size_t buflen)
6130 int idx;
6131 const char *msg;
6133 if (errnum >= 0) {
6134 msg = strerror_r(errnum, buf, buflen);
6135 if (msg != buf) {
6136 size_t len = strlen(msg);
6137 memcpy(buf, msg, min(buflen - 1, len));
6138 *(buf + min(buflen - 1, len)) = '\0';
6140 return 0;
6143 if (errnum <= __PEVENT_ERRNO__START ||
6144 errnum >= __PEVENT_ERRNO__END)
6145 return -1;
6147 idx = errnum - __PEVENT_ERRNO__START - 1;
6148 msg = pevent_error_str[idx];
6149 snprintf(buf, buflen, "%s", msg);
6151 return 0;
6154 int get_field_val(struct trace_seq *s, struct format_field *field,
6155 const char *name, struct pevent_record *record,
6156 unsigned long long *val, int err)
6158 if (!field) {
6159 if (err)
6160 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
6161 return -1;
6164 if (pevent_read_number_field(field, record->data, val)) {
6165 if (err)
6166 trace_seq_printf(s, " %s=INVALID", name);
6167 return -1;
6170 return 0;
6174 * pevent_get_field_raw - return the raw pointer into the data field
6175 * @s: The seq to print to on error
6176 * @event: the event that the field is for
6177 * @name: The name of the field
6178 * @record: The record with the field name.
6179 * @len: place to store the field length.
6180 * @err: print default error if failed.
6182 * Returns a pointer into record->data of the field and places
6183 * the length of the field in @len.
6185 * On failure, it returns NULL.
6187 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
6188 const char *name, struct pevent_record *record,
6189 int *len, int err)
6191 struct format_field *field;
6192 void *data = record->data;
6193 unsigned offset;
6194 int dummy;
6196 if (!event)
6197 return NULL;
6199 field = pevent_find_field(event, name);
6201 if (!field) {
6202 if (err)
6203 trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
6204 return NULL;
6207 /* Allow @len to be NULL */
6208 if (!len)
6209 len = &dummy;
6211 offset = field->offset;
6212 if (field->flags & FIELD_IS_DYNAMIC) {
6213 offset = pevent_read_number(event->pevent,
6214 data + offset, field->size);
6215 *len = offset >> 16;
6216 offset &= 0xffff;
6217 } else
6218 *len = field->size;
6220 return data + offset;
6224 * pevent_get_field_val - find a field and return its value
6225 * @s: The seq to print to on error
6226 * @event: the event that the field is for
6227 * @name: The name of the field
6228 * @record: The record with the field name.
6229 * @val: place to store the value of the field.
6230 * @err: print default error if failed.
6232 * Returns 0 on success -1 on field not found.
6234 int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
6235 const char *name, struct pevent_record *record,
6236 unsigned long long *val, int err)
6238 struct format_field *field;
6240 if (!event)
6241 return -1;
6243 field = pevent_find_field(event, name);
6245 return get_field_val(s, field, name, record, val, err);
6249 * pevent_get_common_field_val - find a common field and return its value
6250 * @s: The seq to print to on error
6251 * @event: the event that the field is for
6252 * @name: The name of the field
6253 * @record: The record with the field name.
6254 * @val: place to store the value of the field.
6255 * @err: print default error if failed.
6257 * Returns 0 on success -1 on field not found.
6259 int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
6260 const char *name, struct pevent_record *record,
6261 unsigned long long *val, int err)
6263 struct format_field *field;
6265 if (!event)
6266 return -1;
6268 field = pevent_find_common_field(event, name);
6270 return get_field_val(s, field, name, record, val, err);
6274 * pevent_get_any_field_val - find a any field and return its value
6275 * @s: The seq to print to on error
6276 * @event: the event that the field is for
6277 * @name: The name of the field
6278 * @record: The record with the field name.
6279 * @val: place to store the value of the field.
6280 * @err: print default error if failed.
6282 * Returns 0 on success -1 on field not found.
6284 int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
6285 const char *name, struct pevent_record *record,
6286 unsigned long long *val, int err)
6288 struct format_field *field;
6290 if (!event)
6291 return -1;
6293 field = pevent_find_any_field(event, name);
6295 return get_field_val(s, field, name, record, val, err);
6299 * pevent_print_num_field - print a field and a format
6300 * @s: The seq to print to
6301 * @fmt: The printf format to print the field with.
6302 * @event: the event that the field is for
6303 * @name: The name of the field
6304 * @record: The record with the field name.
6305 * @err: print default error if failed.
6307 * Returns: 0 on success, -1 field not found, or 1 if buffer is full.
6309 int pevent_print_num_field(struct trace_seq *s, const char *fmt,
6310 struct event_format *event, const char *name,
6311 struct pevent_record *record, int err)
6313 struct format_field *field = pevent_find_field(event, name);
6314 unsigned long long val;
6316 if (!field)
6317 goto failed;
6319 if (pevent_read_number_field(field, record->data, &val))
6320 goto failed;
6322 return trace_seq_printf(s, fmt, val);
6324 failed:
6325 if (err)
6326 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
6327 return -1;
6331 * pevent_print_func_field - print a field and a format for function pointers
6332 * @s: The seq to print to
6333 * @fmt: The printf format to print the field with.
6334 * @event: the event that the field is for
6335 * @name: The name of the field
6336 * @record: The record with the field name.
6337 * @err: print default error if failed.
6339 * Returns: 0 on success, -1 field not found, or 1 if buffer is full.
6341 int pevent_print_func_field(struct trace_seq *s, const char *fmt,
6342 struct event_format *event, const char *name,
6343 struct pevent_record *record, int err)
6345 struct format_field *field = pevent_find_field(event, name);
6346 struct pevent *pevent = event->pevent;
6347 unsigned long long val;
6348 struct func_map *func;
6349 char tmp[128];
6351 if (!field)
6352 goto failed;
6354 if (pevent_read_number_field(field, record->data, &val))
6355 goto failed;
6357 func = find_func(pevent, val);
6359 if (func)
6360 snprintf(tmp, 128, "%s/0x%llx", func->func, func->addr - val);
6361 else
6362 sprintf(tmp, "0x%08llx", val);
6364 return trace_seq_printf(s, fmt, tmp);
6366 failed:
6367 if (err)
6368 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
6369 return -1;
6372 static void free_func_handle(struct pevent_function_handler *func)
6374 struct pevent_func_params *params;
6376 free(func->name);
6378 while (func->params) {
6379 params = func->params;
6380 func->params = params->next;
6381 free(params);
6384 free(func);
6388 * pevent_register_print_function - register a helper function
6389 * @pevent: the handle to the pevent
6390 * @func: the function to process the helper function
6391 * @ret_type: the return type of the helper function
6392 * @name: the name of the helper function
6393 * @parameters: A list of enum pevent_func_arg_type
6395 * Some events may have helper functions in the print format arguments.
6396 * This allows a plugin to dynamically create a way to process one
6397 * of these functions.
6399 * The @parameters is a variable list of pevent_func_arg_type enums that
6400 * must end with PEVENT_FUNC_ARG_VOID.
6402 int pevent_register_print_function(struct pevent *pevent,
6403 pevent_func_handler func,
6404 enum pevent_func_arg_type ret_type,
6405 char *name, ...)
6407 struct pevent_function_handler *func_handle;
6408 struct pevent_func_params **next_param;
6409 struct pevent_func_params *param;
6410 enum pevent_func_arg_type type;
6411 va_list ap;
6412 int ret;
6414 func_handle = find_func_handler(pevent, name);
6415 if (func_handle) {
6417 * This is most like caused by the users own
6418 * plugins updating the function. This overrides the
6419 * system defaults.
6421 pr_stat("override of function helper '%s'", name);
6422 remove_func_handler(pevent, name);
6425 func_handle = calloc(1, sizeof(*func_handle));
6426 if (!func_handle) {
6427 do_warning("Failed to allocate function handler");
6428 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6431 func_handle->ret_type = ret_type;
6432 func_handle->name = strdup(name);
6433 func_handle->func = func;
6434 if (!func_handle->name) {
6435 do_warning("Failed to allocate function name");
6436 free(func_handle);
6437 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6440 next_param = &(func_handle->params);
6441 va_start(ap, name);
6442 for (;;) {
6443 type = va_arg(ap, enum pevent_func_arg_type);
6444 if (type == PEVENT_FUNC_ARG_VOID)
6445 break;
6447 if (type >= PEVENT_FUNC_ARG_MAX_TYPES) {
6448 do_warning("Invalid argument type %d", type);
6449 ret = PEVENT_ERRNO__INVALID_ARG_TYPE;
6450 goto out_free;
6453 param = malloc(sizeof(*param));
6454 if (!param) {
6455 do_warning("Failed to allocate function param");
6456 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
6457 goto out_free;
6459 param->type = type;
6460 param->next = NULL;
6462 *next_param = param;
6463 next_param = &(param->next);
6465 func_handle->nr_args++;
6467 va_end(ap);
6469 func_handle->next = pevent->func_handlers;
6470 pevent->func_handlers = func_handle;
6472 return 0;
6473 out_free:
6474 va_end(ap);
6475 free_func_handle(func_handle);
6476 return ret;
6480 * pevent_unregister_print_function - unregister a helper function
6481 * @pevent: the handle to the pevent
6482 * @func: the function to process the helper function
6483 * @name: the name of the helper function
6485 * This function removes existing print handler for function @name.
6487 * Returns 0 if the handler was removed successully, -1 otherwise.
6489 int pevent_unregister_print_function(struct pevent *pevent,
6490 pevent_func_handler func, char *name)
6492 struct pevent_function_handler *func_handle;
6494 func_handle = find_func_handler(pevent, name);
6495 if (func_handle && func_handle->func == func) {
6496 remove_func_handler(pevent, name);
6497 return 0;
6499 return -1;
6502 static struct event_format *pevent_search_event(struct pevent *pevent, int id,
6503 const char *sys_name,
6504 const char *event_name)
6506 struct event_format *event;
6508 if (id >= 0) {
6509 /* search by id */
6510 event = pevent_find_event(pevent, id);
6511 if (!event)
6512 return NULL;
6513 if (event_name && (strcmp(event_name, event->name) != 0))
6514 return NULL;
6515 if (sys_name && (strcmp(sys_name, event->system) != 0))
6516 return NULL;
6517 } else {
6518 event = pevent_find_event_by_name(pevent, sys_name, event_name);
6519 if (!event)
6520 return NULL;
6522 return event;
6526 * pevent_register_event_handler - register a way to parse an event
6527 * @pevent: the handle to the pevent
6528 * @id: the id of the event to register
6529 * @sys_name: the system name the event belongs to
6530 * @event_name: the name of the event
6531 * @func: the function to call to parse the event information
6532 * @context: the data to be passed to @func
6534 * This function allows a developer to override the parsing of
6535 * a given event. If for some reason the default print format
6536 * is not sufficient, this function will register a function
6537 * for an event to be used to parse the data instead.
6539 * If @id is >= 0, then it is used to find the event.
6540 * else @sys_name and @event_name are used.
6542 int pevent_register_event_handler(struct pevent *pevent, int id,
6543 const char *sys_name, const char *event_name,
6544 pevent_event_handler_func func, void *context)
6546 struct event_format *event;
6547 struct event_handler *handle;
6549 event = pevent_search_event(pevent, id, sys_name, event_name);
6550 if (event == NULL)
6551 goto not_found;
6553 pr_stat("overriding event (%d) %s:%s with new print handler",
6554 event->id, event->system, event->name);
6556 event->handler = func;
6557 event->context = context;
6558 return 0;
6560 not_found:
6561 /* Save for later use. */
6562 handle = calloc(1, sizeof(*handle));
6563 if (!handle) {
6564 do_warning("Failed to allocate event handler");
6565 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6568 handle->id = id;
6569 if (event_name)
6570 handle->event_name = strdup(event_name);
6571 if (sys_name)
6572 handle->sys_name = strdup(sys_name);
6574 if ((event_name && !handle->event_name) ||
6575 (sys_name && !handle->sys_name)) {
6576 do_warning("Failed to allocate event/sys name");
6577 free((void *)handle->event_name);
6578 free((void *)handle->sys_name);
6579 free(handle);
6580 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
6583 handle->func = func;
6584 handle->next = pevent->handlers;
6585 pevent->handlers = handle;
6586 handle->context = context;
6588 return -1;
6591 static int handle_matches(struct event_handler *handler, int id,
6592 const char *sys_name, const char *event_name,
6593 pevent_event_handler_func func, void *context)
6595 if (id >= 0 && id != handler->id)
6596 return 0;
6598 if (event_name && (strcmp(event_name, handler->event_name) != 0))
6599 return 0;
6601 if (sys_name && (strcmp(sys_name, handler->sys_name) != 0))
6602 return 0;
6604 if (func != handler->func || context != handler->context)
6605 return 0;
6607 return 1;
6611 * pevent_unregister_event_handler - unregister an existing event handler
6612 * @pevent: the handle to the pevent
6613 * @id: the id of the event to unregister
6614 * @sys_name: the system name the handler belongs to
6615 * @event_name: the name of the event handler
6616 * @func: the function to call to parse the event information
6617 * @context: the data to be passed to @func
6619 * This function removes existing event handler (parser).
6621 * If @id is >= 0, then it is used to find the event.
6622 * else @sys_name and @event_name are used.
6624 * Returns 0 if handler was removed successfully, -1 if event was not found.
6626 int pevent_unregister_event_handler(struct pevent *pevent, int id,
6627 const char *sys_name, const char *event_name,
6628 pevent_event_handler_func func, void *context)
6630 struct event_format *event;
6631 struct event_handler *handle;
6632 struct event_handler **next;
6634 event = pevent_search_event(pevent, id, sys_name, event_name);
6635 if (event == NULL)
6636 goto not_found;
6638 if (event->handler == func && event->context == context) {
6639 pr_stat("removing override handler for event (%d) %s:%s. Going back to default handler.",
6640 event->id, event->system, event->name);
6642 event->handler = NULL;
6643 event->context = NULL;
6644 return 0;
6647 not_found:
6648 for (next = &pevent->handlers; *next; next = &(*next)->next) {
6649 handle = *next;
6650 if (handle_matches(handle, id, sys_name, event_name,
6651 func, context))
6652 break;
6655 if (!(*next))
6656 return -1;
6658 *next = handle->next;
6659 free_handler(handle);
6661 return 0;
6665 * pevent_alloc - create a pevent handle
6667 struct pevent *pevent_alloc(void)
6669 struct pevent *pevent = calloc(1, sizeof(*pevent));
6671 if (pevent)
6672 pevent->ref_count = 1;
6674 return pevent;
6677 void pevent_ref(struct pevent *pevent)
6679 pevent->ref_count++;
6682 void pevent_free_format_field(struct format_field *field)
6684 free(field->type);
6685 if (field->alias != field->name)
6686 free(field->alias);
6687 free(field->name);
6688 free(field);
6691 static void free_format_fields(struct format_field *field)
6693 struct format_field *next;
6695 while (field) {
6696 next = field->next;
6697 pevent_free_format_field(field);
6698 field = next;
6702 static void free_formats(struct format *format)
6704 free_format_fields(format->common_fields);
6705 free_format_fields(format->fields);
6708 void pevent_free_format(struct event_format *event)
6710 free(event->name);
6711 free(event->system);
6713 free_formats(&event->format);
6715 free(event->print_fmt.format);
6716 free_args(event->print_fmt.args);
6718 free(event);
6722 * pevent_free - free a pevent handle
6723 * @pevent: the pevent handle to free
6725 void pevent_free(struct pevent *pevent)
6727 struct cmdline_list *cmdlist, *cmdnext;
6728 struct func_list *funclist, *funcnext;
6729 struct printk_list *printklist, *printknext;
6730 struct pevent_function_handler *func_handler;
6731 struct event_handler *handle;
6732 int i;
6734 if (!pevent)
6735 return;
6737 cmdlist = pevent->cmdlist;
6738 funclist = pevent->funclist;
6739 printklist = pevent->printklist;
6741 pevent->ref_count--;
6742 if (pevent->ref_count)
6743 return;
6745 if (pevent->cmdlines) {
6746 for (i = 0; i < pevent->cmdline_count; i++)
6747 free(pevent->cmdlines[i].comm);
6748 free(pevent->cmdlines);
6751 while (cmdlist) {
6752 cmdnext = cmdlist->next;
6753 free(cmdlist->comm);
6754 free(cmdlist);
6755 cmdlist = cmdnext;
6758 if (pevent->func_map) {
6759 for (i = 0; i < (int)pevent->func_count; i++) {
6760 free(pevent->func_map[i].func);
6761 free(pevent->func_map[i].mod);
6763 free(pevent->func_map);
6766 while (funclist) {
6767 funcnext = funclist->next;
6768 free(funclist->func);
6769 free(funclist->mod);
6770 free(funclist);
6771 funclist = funcnext;
6774 while (pevent->func_handlers) {
6775 func_handler = pevent->func_handlers;
6776 pevent->func_handlers = func_handler->next;
6777 free_func_handle(func_handler);
6780 if (pevent->printk_map) {
6781 for (i = 0; i < (int)pevent->printk_count; i++)
6782 free(pevent->printk_map[i].printk);
6783 free(pevent->printk_map);
6786 while (printklist) {
6787 printknext = printklist->next;
6788 free(printklist->printk);
6789 free(printklist);
6790 printklist = printknext;
6793 for (i = 0; i < pevent->nr_events; i++)
6794 pevent_free_format(pevent->events[i]);
6796 while (pevent->handlers) {
6797 handle = pevent->handlers;
6798 pevent->handlers = handle->next;
6799 free_handler(handle);
6802 free(pevent->trace_clock);
6803 free(pevent->events);
6804 free(pevent->sort_events);
6805 free(pevent->func_resolver);
6807 free(pevent);
6810 void pevent_unref(struct pevent *pevent)
6812 pevent_free(pevent);