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Linux/tools/lib/traceevent/event-parse.c

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  1 /*
  2  * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
  3  *
  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!)
  9  *
 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.
 14  *
 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>
 17  *
 18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 19  *
 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.
 25  */
 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>
 34 
 35 #include "event-parse.h"
 36 #include "event-utils.h"
 37 
 38 static const char *input_buf;
 39 static unsigned long long input_buf_ptr;
 40 static unsigned long long input_buf_siz;
 41 
 42 static int is_flag_field;
 43 static int is_symbolic_field;
 44 
 45 static int show_warning = 1;
 46 
 47 #define do_warning(fmt, ...)                            \
 48         do {                                            \
 49                 if (show_warning)                       \
 50                         warning(fmt, ##__VA_ARGS__);    \
 51         } while (0)
 52 
 53 static void init_input_buf(const char *buf, unsigned long long size)
 54 {
 55         input_buf = buf;
 56         input_buf_siz = size;
 57         input_buf_ptr = 0;
 58 }
 59 
 60 const char *pevent_get_input_buf(void)
 61 {
 62         return input_buf;
 63 }
 64 
 65 unsigned long long pevent_get_input_buf_ptr(void)
 66 {
 67         return input_buf_ptr;
 68 }
 69 
 70 struct event_handler {
 71         struct event_handler            *next;
 72         int                             id;
 73         const char                      *sys_name;
 74         const char                      *event_name;
 75         pevent_event_handler_func       func;
 76         void                            *context;
 77 };
 78 
 79 struct pevent_func_params {
 80         struct pevent_func_params       *next;
 81         enum pevent_func_arg_type       type;
 82 };
 83 
 84 struct pevent_function_handler {
 85         struct pevent_function_handler  *next;
 86         enum pevent_func_arg_type       ret_type;
 87         char                            *name;
 88         pevent_func_handler             func;
 89         struct pevent_func_params       *params;
 90         int                             nr_args;
 91 };
 92 
 93 static unsigned long long
 94 process_defined_func(struct trace_seq *s, void *data, int size,
 95                      struct event_format *event, struct print_arg *arg);
 96 
 97 static void free_func_handle(struct pevent_function_handler *func);
 98 
 99 /**
100  * pevent_buffer_init - init buffer for parsing
101  * @buf: buffer to parse
102  * @size: the size of the buffer
103  *
104  * For use with pevent_read_token(), this initializes the internal
105  * buffer that pevent_read_token() will parse.
106  */
107 void pevent_buffer_init(const char *buf, unsigned long long size)
108 {
109         init_input_buf(buf, size);
110 }
111 
112 void breakpoint(void)
113 {
114         static int x;
115         x++;
116 }
117 
118 struct print_arg *alloc_arg(void)
119 {
120         return calloc(1, sizeof(struct print_arg));
121 }
122 
123 struct cmdline {
124         char *comm;
125         int pid;
126 };
127 
128 static int cmdline_cmp(const void *a, const void *b)
129 {
130         const struct cmdline *ca = a;
131         const struct cmdline *cb = b;
132 
133         if (ca->pid < cb->pid)
134                 return -1;
135         if (ca->pid > cb->pid)
136                 return 1;
137 
138         return 0;
139 }
140 
141 struct cmdline_list {
142         struct cmdline_list     *next;
143         char                    *comm;
144         int                     pid;
145 };
146 
147 static int cmdline_init(struct pevent *pevent)
148 {
149         struct cmdline_list *cmdlist = pevent->cmdlist;
150         struct cmdline_list *item;
151         struct cmdline *cmdlines;
152         int i;
153 
154         cmdlines = malloc(sizeof(*cmdlines) * pevent->cmdline_count);
155         if (!cmdlines)
156                 return -1;
157 
158         i = 0;
159         while (cmdlist) {
160                 cmdlines[i].pid = cmdlist->pid;
161                 cmdlines[i].comm = cmdlist->comm;
162                 i++;
163                 item = cmdlist;
164                 cmdlist = cmdlist->next;
165                 free(item);
166         }
167 
168         qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
169 
170         pevent->cmdlines = cmdlines;
171         pevent->cmdlist = NULL;
172 
173         return 0;
174 }
175 
176 static const char *find_cmdline(struct pevent *pevent, int pid)
177 {
178         const struct cmdline *comm;
179         struct cmdline key;
180 
181         if (!pid)
182                 return "<idle>";
183 
184         if (!pevent->cmdlines && cmdline_init(pevent))
185                 return "<not enough memory for cmdlines!>";
186 
187         key.pid = pid;
188 
189         comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
190                        sizeof(*pevent->cmdlines), cmdline_cmp);
191 
192         if (comm)
193                 return comm->comm;
194         return "<...>";
195 }
196 
197 /**
198  * pevent_pid_is_registered - return if a pid has a cmdline registered
199  * @pevent: handle for the pevent
200  * @pid: The pid to check if it has a cmdline registered with.
201  *
202  * Returns 1 if the pid has a cmdline mapped to it
203  * 0 otherwise.
204  */
205 int pevent_pid_is_registered(struct pevent *pevent, int pid)
206 {
207         const struct cmdline *comm;
208         struct cmdline key;
209 
210         if (!pid)
211                 return 1;
212 
213         if (!pevent->cmdlines && cmdline_init(pevent))
214                 return 0;
215 
216         key.pid = pid;
217 
218         comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
219                        sizeof(*pevent->cmdlines), cmdline_cmp);
220 
221         if (comm)
222                 return 1;
223         return 0;
224 }
225 
226 /*
227  * If the command lines have been converted to an array, then
228  * we must add this pid. This is much slower than when cmdlines
229  * are added before the array is initialized.
230  */
231 static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
232 {
233         struct cmdline *cmdlines = pevent->cmdlines;
234         const struct cmdline *cmdline;
235         struct cmdline key;
236 
237         if (!pid)
238                 return 0;
239 
240         /* avoid duplicates */
241         key.pid = pid;
242 
243         cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
244                        sizeof(*pevent->cmdlines), cmdline_cmp);
245         if (cmdline) {
246                 errno = EEXIST;
247                 return -1;
248         }
249 
250         cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
251         if (!cmdlines) {
252                 errno = ENOMEM;
253                 return -1;
254         }
255 
256         cmdlines[pevent->cmdline_count].comm = strdup(comm);
257         if (!cmdlines[pevent->cmdline_count].comm) {
258                 free(cmdlines);
259                 errno = ENOMEM;
260                 return -1;
261         }
262 
263         cmdlines[pevent->cmdline_count].pid = pid;
264                 
265         if (cmdlines[pevent->cmdline_count].comm)
266                 pevent->cmdline_count++;
267 
268         qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
269         pevent->cmdlines = cmdlines;
270 
271         return 0;
272 }
273 
274 /**
275  * pevent_register_comm - register a pid / comm mapping
276  * @pevent: handle for the pevent
277  * @comm: the command line to register
278  * @pid: the pid to map the command line to
279  *
280  * This adds a mapping to search for command line names with
281  * a given pid. The comm is duplicated.
282  */
283 int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
284 {
285         struct cmdline_list *item;
286 
287         if (pevent->cmdlines)
288                 return add_new_comm(pevent, comm, pid);
289 
290         item = malloc(sizeof(*item));
291         if (!item)
292                 return -1;
293 
294         item->comm = strdup(comm);
295         if (!item->comm) {
296                 free(item);
297                 return -1;
298         }
299         item->pid = pid;
300         item->next = pevent->cmdlist;
301 
302         pevent->cmdlist = item;
303         pevent->cmdline_count++;
304 
305         return 0;
306 }
307 
308 void pevent_register_trace_clock(struct pevent *pevent, char *trace_clock)
309 {
310         pevent->trace_clock = trace_clock;
311 }
312 
313 struct func_map {
314         unsigned long long              addr;
315         char                            *func;
316         char                            *mod;
317 };
318 
319 struct func_list {
320         struct func_list        *next;
321         unsigned long long      addr;
322         char                    *func;
323         char                    *mod;
324 };
325 
326 static int func_cmp(const void *a, const void *b)
327 {
328         const struct func_map *fa = a;
329         const struct func_map *fb = b;
330 
331         if (fa->addr < fb->addr)
332                 return -1;
333         if (fa->addr > fb->addr)
334                 return 1;
335 
336         return 0;
337 }
338 
339 /*
340  * We are searching for a record in between, not an exact
341  * match.
342  */
343 static int func_bcmp(const void *a, const void *b)
344 {
345         const struct func_map *fa = a;
346         const struct func_map *fb = b;
347 
348         if ((fa->addr == fb->addr) ||
349 
350             (fa->addr > fb->addr &&
351              fa->addr < (fb+1)->addr))
352                 return 0;
353 
354         if (fa->addr < fb->addr)
355                 return -1;
356 
357         return 1;
358 }
359 
360 static int func_map_init(struct pevent *pevent)
361 {
362         struct func_list *funclist;
363         struct func_list *item;
364         struct func_map *func_map;
365         int i;
366 
367         func_map = malloc(sizeof(*func_map) * (pevent->func_count + 1));
368         if (!func_map)
369                 return -1;
370 
371         funclist = pevent->funclist;
372 
373         i = 0;
374         while (funclist) {
375                 func_map[i].func = funclist->func;
376                 func_map[i].addr = funclist->addr;
377                 func_map[i].mod = funclist->mod;
378                 i++;
379                 item = funclist;
380                 funclist = funclist->next;
381                 free(item);
382         }
383 
384         qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
385 
386         /*
387          * Add a special record at the end.
388          */
389         func_map[pevent->func_count].func = NULL;
390         func_map[pevent->func_count].addr = 0;
391         func_map[pevent->func_count].mod = NULL;
392 
393         pevent->func_map = func_map;
394         pevent->funclist = NULL;
395 
396         return 0;
397 }
398 
399 static struct func_map *
400 find_func(struct pevent *pevent, unsigned long long addr)
401 {
402         struct func_map *func;
403         struct func_map key;
404 
405         if (!pevent->func_map)
406                 func_map_init(pevent);
407 
408         key.addr = addr;
409 
410         func = bsearch(&key, pevent->func_map, pevent->func_count,
411                        sizeof(*pevent->func_map), func_bcmp);
412 
413         return func;
414 }
415 
416 /**
417  * pevent_find_function - find a function by a given address
418  * @pevent: handle for the pevent
419  * @addr: the address to find the function with
420  *
421  * Returns a pointer to the function stored that has the given
422  * address. Note, the address does not have to be exact, it
423  * will select the function that would contain the address.
424  */
425 const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
426 {
427         struct func_map *map;
428 
429         map = find_func(pevent, addr);
430         if (!map)
431                 return NULL;
432 
433         return map->func;
434 }
435 
436 /**
437  * pevent_find_function_address - find a function address by a given address
438  * @pevent: handle for the pevent
439  * @addr: the address to find the function with
440  *
441  * Returns the address the function starts at. This can be used in
442  * conjunction with pevent_find_function to print both the function
443  * name and the function offset.
444  */
445 unsigned long long
446 pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
447 {
448         struct func_map *map;
449 
450         map = find_func(pevent, addr);
451         if (!map)
452                 return 0;
453 
454         return map->addr;
455 }
456 
457 /**
458  * pevent_register_function - register a function with a given address
459  * @pevent: handle for the pevent
460  * @function: the function name to register
461  * @addr: the address the function starts at
462  * @mod: the kernel module the function may be in (NULL for none)
463  *
464  * This registers a function name with an address and module.
465  * The @func passed in is duplicated.
466  */
467 int pevent_register_function(struct pevent *pevent, char *func,
468                              unsigned long long addr, char *mod)
469 {
470         struct func_list *item = malloc(sizeof(*item));
471 
472         if (!item)
473                 return -1;
474 
475         item->next = pevent->funclist;
476         item->func = strdup(func);
477         if (!item->func)
478                 goto out_free;
479 
480         if (mod) {
481                 item->mod = strdup(mod);
482                 if (!item->mod)
483                         goto out_free_func;
484         } else
485                 item->mod = NULL;
486         item->addr = addr;
487 
488         pevent->funclist = item;
489         pevent->func_count++;
490 
491         return 0;
492 
493 out_free_func:
494         free(item->func);
495         item->func = NULL;
496 out_free:
497         free(item);
498         errno = ENOMEM;
499         return -1;
500 }
501 
502 /**
503  * pevent_print_funcs - print out the stored functions
504  * @pevent: handle for the pevent
505  *
506  * This prints out the stored functions.
507  */
508 void pevent_print_funcs(struct pevent *pevent)
509 {
510         int i;
511 
512         if (!pevent->func_map)
513                 func_map_init(pevent);
514 
515         for (i = 0; i < (int)pevent->func_count; i++) {
516                 printf("%016llx %s",
517                        pevent->func_map[i].addr,
518                        pevent->func_map[i].func);
519                 if (pevent->func_map[i].mod)
520                         printf(" [%s]\n", pevent->func_map[i].mod);
521                 else
522                         printf("\n");
523         }
524 }
525 
526 struct printk_map {
527         unsigned long long              addr;
528         char                            *printk;
529 };
530 
531 struct printk_list {
532         struct printk_list      *next;
533         unsigned long long      addr;
534         char                    *printk;
535 };
536 
537 static int printk_cmp(const void *a, const void *b)
538 {
539         const struct printk_map *pa = a;
540         const struct printk_map *pb = b;
541 
542         if (pa->addr < pb->addr)
543                 return -1;
544         if (pa->addr > pb->addr)
545                 return 1;
546 
547         return 0;
548 }
549 
550 static int printk_map_init(struct pevent *pevent)
551 {
552         struct printk_list *printklist;
553         struct printk_list *item;
554         struct printk_map *printk_map;
555         int i;
556 
557         printk_map = malloc(sizeof(*printk_map) * (pevent->printk_count + 1));
558         if (!printk_map)
559                 return -1;
560 
561         printklist = pevent->printklist;
562 
563         i = 0;
564         while (printklist) {
565                 printk_map[i].printk = printklist->printk;
566                 printk_map[i].addr = printklist->addr;
567                 i++;
568                 item = printklist;
569                 printklist = printklist->next;
570                 free(item);
571         }
572 
573         qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
574 
575         pevent->printk_map = printk_map;
576         pevent->printklist = NULL;
577 
578         return 0;
579 }
580 
581 static struct printk_map *
582 find_printk(struct pevent *pevent, unsigned long long addr)
583 {
584         struct printk_map *printk;
585         struct printk_map key;
586 
587         if (!pevent->printk_map && printk_map_init(pevent))
588                 return NULL;
589 
590         key.addr = addr;
591 
592         printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
593                          sizeof(*pevent->printk_map), printk_cmp);
594 
595         return printk;
596 }
597 
598 /**
599  * pevent_register_print_string - register a string by its address
600  * @pevent: handle for the pevent
601  * @fmt: the string format to register
602  * @addr: the address the string was located at
603  *
604  * This registers a string by the address it was stored in the kernel.
605  * The @fmt passed in is duplicated.
606  */
607 int pevent_register_print_string(struct pevent *pevent, const char *fmt,
608                                  unsigned long long addr)
609 {
610         struct printk_list *item = malloc(sizeof(*item));
611         char *p;
612 
613         if (!item)
614                 return -1;
615 
616         item->next = pevent->printklist;
617         item->addr = addr;
618 
619         /* Strip off quotes and '\n' from the end */
620         if (fmt[0] == '"')
621                 fmt++;
622         item->printk = strdup(fmt);
623         if (!item->printk)
624                 goto out_free;
625 
626         p = item->printk + strlen(item->printk) - 1;
627         if (*p == '"')
628                 *p = 0;
629 
630         p -= 2;
631         if (strcmp(p, "\\n") == 0)
632                 *p = 0;
633 
634         pevent->printklist = item;
635         pevent->printk_count++;
636 
637         return 0;
638 
639 out_free:
640         free(item);
641         errno = ENOMEM;
642         return -1;
643 }
644 
645 /**
646  * pevent_print_printk - print out the stored strings
647  * @pevent: handle for the pevent
648  *
649  * This prints the string formats that were stored.
650  */
651 void pevent_print_printk(struct pevent *pevent)
652 {
653         int i;
654 
655         if (!pevent->printk_map)
656                 printk_map_init(pevent);
657 
658         for (i = 0; i < (int)pevent->printk_count; i++) {
659                 printf("%016llx %s\n",
660                        pevent->printk_map[i].addr,
661                        pevent->printk_map[i].printk);
662         }
663 }
664 
665 static struct event_format *alloc_event(void)
666 {
667         return calloc(1, sizeof(struct event_format));
668 }
669 
670 static int add_event(struct pevent *pevent, struct event_format *event)
671 {
672         int i;
673         struct event_format **events = realloc(pevent->events, sizeof(event) *
674                                                (pevent->nr_events + 1));
675         if (!events)
676                 return -1;
677 
678         pevent->events = events;
679 
680         for (i = 0; i < pevent->nr_events; i++) {
681                 if (pevent->events[i]->id > event->id)
682                         break;
683         }
684         if (i < pevent->nr_events)
685                 memmove(&pevent->events[i + 1],
686                         &pevent->events[i],
687                         sizeof(event) * (pevent->nr_events - i));
688 
689         pevent->events[i] = event;
690         pevent->nr_events++;
691 
692         event->pevent = pevent;
693 
694         return 0;
695 }
696 
697 static int event_item_type(enum event_type type)
698 {
699         switch (type) {
700         case EVENT_ITEM ... EVENT_SQUOTE:
701                 return 1;
702         case EVENT_ERROR ... EVENT_DELIM:
703         default:
704                 return 0;
705         }
706 }
707 
708 static void free_flag_sym(struct print_flag_sym *fsym)
709 {
710         struct print_flag_sym *next;
711 
712         while (fsym) {
713                 next = fsym->next;
714                 free(fsym->value);
715                 free(fsym->str);
716                 free(fsym);
717                 fsym = next;
718         }
719 }
720 
721 static void free_arg(struct print_arg *arg)
722 {
723         struct print_arg *farg;
724 
725         if (!arg)
726                 return;
727 
728         switch (arg->type) {
729         case PRINT_ATOM:
730                 free(arg->atom.atom);
731                 break;
732         case PRINT_FIELD:
733                 free(arg->field.name);
734                 break;
735         case PRINT_FLAGS:
736                 free_arg(arg->flags.field);
737                 free(arg->flags.delim);
738                 free_flag_sym(arg->flags.flags);
739                 break;
740         case PRINT_SYMBOL:
741                 free_arg(arg->symbol.field);
742                 free_flag_sym(arg->symbol.symbols);
743                 break;
744         case PRINT_HEX:
745                 free_arg(arg->hex.field);
746                 free_arg(arg->hex.size);
747                 break;
748         case PRINT_TYPE:
749                 free(arg->typecast.type);
750                 free_arg(arg->typecast.item);
751                 break;
752         case PRINT_STRING:
753         case PRINT_BSTRING:
754                 free(arg->string.string);
755                 break;
756         case PRINT_DYNAMIC_ARRAY:
757                 free(arg->dynarray.index);
758                 break;
759         case PRINT_OP:
760                 free(arg->op.op);
761                 free_arg(arg->op.left);
762                 free_arg(arg->op.right);
763                 break;
764         case PRINT_FUNC:
765                 while (arg->func.args) {
766                         farg = arg->func.args;
767                         arg->func.args = farg->next;
768                         free_arg(farg);
769                 }
770                 break;
771 
772         case PRINT_NULL:
773         default:
774                 break;
775         }
776 
777         free(arg);
778 }
779 
780 static enum event_type get_type(int ch)
781 {
782         if (ch == '\n')
783                 return EVENT_NEWLINE;
784         if (isspace(ch))
785                 return EVENT_SPACE;
786         if (isalnum(ch) || ch == '_')
787                 return EVENT_ITEM;
788         if (ch == '\'')
789                 return EVENT_SQUOTE;
790         if (ch == '"')
791                 return EVENT_DQUOTE;
792         if (!isprint(ch))
793                 return EVENT_NONE;
794         if (ch == '(' || ch == ')' || ch == ',')
795                 return EVENT_DELIM;
796 
797         return EVENT_OP;
798 }
799 
800 static int __read_char(void)
801 {
802         if (input_buf_ptr >= input_buf_siz)
803                 return -1;
804 
805         return input_buf[input_buf_ptr++];
806 }
807 
808 static int __peek_char(void)
809 {
810         if (input_buf_ptr >= input_buf_siz)
811                 return -1;
812 
813         return input_buf[input_buf_ptr];
814 }
815 
816 /**
817  * pevent_peek_char - peek at the next character that will be read
818  *
819  * Returns the next character read, or -1 if end of buffer.
820  */
821 int pevent_peek_char(void)
822 {
823         return __peek_char();
824 }
825 
826 static int extend_token(char **tok, char *buf, int size)
827 {
828         char *newtok = realloc(*tok, size);
829 
830         if (!newtok) {
831                 free(*tok);
832                 *tok = NULL;
833                 return -1;
834         }
835 
836         if (!*tok)
837                 strcpy(newtok, buf);
838         else
839                 strcat(newtok, buf);
840         *tok = newtok;
841 
842         return 0;
843 }
844 
845 static enum event_type force_token(const char *str, char **tok);
846 
847 static enum event_type __read_token(char **tok)
848 {
849         char buf[BUFSIZ];
850         int ch, last_ch, quote_ch, next_ch;
851         int i = 0;
852         int tok_size = 0;
853         enum event_type type;
854 
855         *tok = NULL;
856 
857 
858         ch = __read_char();
859         if (ch < 0)
860                 return EVENT_NONE;
861 
862         type = get_type(ch);
863         if (type == EVENT_NONE)
864                 return type;
865 
866         buf[i++] = ch;
867 
868         switch (type) {
869         case EVENT_NEWLINE:
870         case EVENT_DELIM:
871                 if (asprintf(tok, "%c", ch) < 0)
872                         return EVENT_ERROR;
873 
874                 return type;
875 
876         case EVENT_OP:
877                 switch (ch) {
878                 case '-':
879                         next_ch = __peek_char();
880                         if (next_ch == '>') {
881                                 buf[i++] = __read_char();
882                                 break;
883                         }
884                         /* fall through */
885                 case '+':
886                 case '|':
887                 case '&':
888                 case '>':
889                 case '<':
890                         last_ch = ch;
891                         ch = __peek_char();
892                         if (ch != last_ch)
893                                 goto test_equal;
894                         buf[i++] = __read_char();
895                         switch (last_ch) {
896                         case '>':
897                         case '<':
898                                 goto test_equal;
899                         default:
900                                 break;
901                         }
902                         break;
903                 case '!':
904                 case '=':
905                         goto test_equal;
906                 default: /* what should we do instead? */
907                         break;
908                 }
909                 buf[i] = 0;
910                 *tok = strdup(buf);
911                 return type;
912 
913  test_equal:
914                 ch = __peek_char();
915                 if (ch == '=')
916                         buf[i++] = __read_char();
917                 goto out;
918 
919         case EVENT_DQUOTE:
920         case EVENT_SQUOTE:
921                 /* don't keep quotes */
922                 i--;
923                 quote_ch = ch;
924                 last_ch = 0;
925  concat:
926                 do {
927                         if (i == (BUFSIZ - 1)) {
928                                 buf[i] = 0;
929                                 tok_size += BUFSIZ;
930 
931                                 if (extend_token(tok, buf, tok_size) < 0)
932                                         return EVENT_NONE;
933                                 i = 0;
934                         }
935                         last_ch = ch;
936                         ch = __read_char();
937                         buf[i++] = ch;
938                         /* the '\' '\' will cancel itself */
939                         if (ch == '\\' && last_ch == '\\')
940                                 last_ch = 0;
941                 } while (ch != quote_ch || last_ch == '\\');
942                 /* remove the last quote */
943                 i--;
944 
945                 /*
946                  * For strings (double quotes) check the next token.
947                  * If it is another string, concatinate the two.
948                  */
949                 if (type == EVENT_DQUOTE) {
950                         unsigned long long save_input_buf_ptr = input_buf_ptr;
951 
952                         do {
953                                 ch = __read_char();
954                         } while (isspace(ch));
955                         if (ch == '"')
956                                 goto concat;
957                         input_buf_ptr = save_input_buf_ptr;
958                 }
959 
960                 goto out;
961 
962         case EVENT_ERROR ... EVENT_SPACE:
963         case EVENT_ITEM:
964         default:
965                 break;
966         }
967 
968         while (get_type(__peek_char()) == type) {
969                 if (i == (BUFSIZ - 1)) {
970                         buf[i] = 0;
971                         tok_size += BUFSIZ;
972 
973                         if (extend_token(tok, buf, tok_size) < 0)
974                                 return EVENT_NONE;
975                         i = 0;
976                 }
977                 ch = __read_char();
978                 buf[i++] = ch;
979         }
980 
981  out:
982         buf[i] = 0;
983         if (extend_token(tok, buf, tok_size + i + 1) < 0)
984                 return EVENT_NONE;
985 
986         if (type == EVENT_ITEM) {
987                 /*
988                  * Older versions of the kernel has a bug that
989                  * creates invalid symbols and will break the mac80211
990                  * parsing. This is a work around to that bug.
991                  *
992                  * See Linux kernel commit:
993                  *  811cb50baf63461ce0bdb234927046131fc7fa8b
994                  */
995                 if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
996                         free(*tok);
997                         *tok = NULL;
998                         return force_token("\"\%s\" ", tok);
999                 } else if (strcmp(*tok, "STA_PR_FMT") == 0) {
1000                         free(*tok);
1001                         *tok = NULL;
1002                         return force_token("\" sta:%pM\" ", tok);
1003                 } else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
1004                         free(*tok);
1005                         *tok = NULL;
1006                         return force_token("\" vif:%p(%d)\" ", tok);
1007                 }
1008         }
1009 
1010         return type;
1011 }
1012 
1013 static enum event_type force_token(const char *str, char **tok)
1014 {
1015         const char *save_input_buf;
1016         unsigned long long save_input_buf_ptr;
1017         unsigned long long save_input_buf_siz;
1018         enum event_type type;
1019         
1020         /* save off the current input pointers */
1021         save_input_buf = input_buf;
1022         save_input_buf_ptr = input_buf_ptr;
1023         save_input_buf_siz = input_buf_siz;
1024 
1025         init_input_buf(str, strlen(str));
1026 
1027         type = __read_token(tok);
1028 
1029         /* reset back to original token */
1030         input_buf = save_input_buf;
1031         input_buf_ptr = save_input_buf_ptr;
1032         input_buf_siz = save_input_buf_siz;
1033 
1034         return type;
1035 }
1036 
1037 static void free_token(char *tok)
1038 {
1039         if (tok)
1040                 free(tok);
1041 }
1042 
1043 static enum event_type read_token(char **tok)
1044 {
1045         enum event_type type;
1046 
1047         for (;;) {
1048                 type = __read_token(tok);
1049                 if (type != EVENT_SPACE)
1050                         return type;
1051 
1052                 free_token(*tok);
1053         }
1054 
1055         /* not reached */
1056         *tok = NULL;
1057         return EVENT_NONE;
1058 }
1059 
1060 /**
1061  * pevent_read_token - access to utilites to use the pevent parser
1062  * @tok: The token to return
1063  *
1064  * This will parse tokens from the string given by
1065  * pevent_init_data().
1066  *
1067  * Returns the token type.
1068  */
1069 enum event_type pevent_read_token(char **tok)
1070 {
1071         return read_token(tok);
1072 }
1073 
1074 /**
1075  * pevent_free_token - free a token returned by pevent_read_token
1076  * @token: the token to free
1077  */
1078 void pevent_free_token(char *token)
1079 {
1080         free_token(token);
1081 }
1082 
1083 /* no newline */
1084 static enum event_type read_token_item(char **tok)
1085 {
1086         enum event_type type;
1087 
1088         for (;;) {
1089                 type = __read_token(tok);
1090                 if (type != EVENT_SPACE && type != EVENT_NEWLINE)
1091                         return type;
1092                 free_token(*tok);
1093                 *tok = NULL;
1094         }
1095 
1096         /* not reached */
1097         *tok = NULL;
1098         return EVENT_NONE;
1099 }
1100 
1101 static int test_type(enum event_type type, enum event_type expect)
1102 {
1103         if (type != expect) {
1104                 do_warning("Error: expected type %d but read %d",
1105                     expect, type);
1106                 return -1;
1107         }
1108         return 0;
1109 }
1110 
1111 static int test_type_token(enum event_type type, const char *token,
1112                     enum event_type expect, const char *expect_tok)
1113 {
1114         if (type != expect) {
1115                 do_warning("Error: expected type %d but read %d",
1116                     expect, type);
1117                 return -1;
1118         }
1119 
1120         if (strcmp(token, expect_tok) != 0) {
1121                 do_warning("Error: expected '%s' but read '%s'",
1122                     expect_tok, token);
1123                 return -1;
1124         }
1125         return 0;
1126 }
1127 
1128 static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
1129 {
1130         enum event_type type;
1131 
1132         if (newline_ok)
1133                 type = read_token(tok);
1134         else
1135                 type = read_token_item(tok);
1136         return test_type(type, expect);
1137 }
1138 
1139 static int read_expect_type(enum event_type expect, char **tok)
1140 {
1141         return __read_expect_type(expect, tok, 1);
1142 }
1143 
1144 static int __read_expected(enum event_type expect, const char *str,
1145                            int newline_ok)
1146 {
1147         enum event_type type;
1148         char *token;
1149         int ret;
1150 
1151         if (newline_ok)
1152                 type = read_token(&token);
1153         else
1154                 type = read_token_item(&token);
1155 
1156         ret = test_type_token(type, token, expect, str);
1157 
1158         free_token(token);
1159 
1160         return ret;
1161 }
1162 
1163 static int read_expected(enum event_type expect, const char *str)
1164 {
1165         return __read_expected(expect, str, 1);
1166 }
1167 
1168 static int read_expected_item(enum event_type expect, const char *str)
1169 {
1170         return __read_expected(expect, str, 0);
1171 }
1172 
1173 static char *event_read_name(void)
1174 {
1175         char *token;
1176 
1177         if (read_expected(EVENT_ITEM, "name") < 0)
1178                 return NULL;
1179 
1180         if (read_expected(EVENT_OP, ":") < 0)
1181                 return NULL;
1182 
1183         if (read_expect_type(EVENT_ITEM, &token) < 0)
1184                 goto fail;
1185 
1186         return token;
1187 
1188  fail:
1189         free_token(token);
1190         return NULL;
1191 }
1192 
1193 static int event_read_id(void)
1194 {
1195         char *token;
1196         int id;
1197 
1198         if (read_expected_item(EVENT_ITEM, "ID") < 0)
1199                 return -1;
1200 
1201         if (read_expected(EVENT_OP, ":") < 0)
1202                 return -1;
1203 
1204         if (read_expect_type(EVENT_ITEM, &token) < 0)
1205                 goto fail;
1206 
1207         id = strtoul(token, NULL, 0);
1208         free_token(token);
1209         return id;
1210 
1211  fail:
1212         free_token(token);
1213         return -1;
1214 }
1215 
1216 static int field_is_string(struct format_field *field)
1217 {
1218         if ((field->flags & FIELD_IS_ARRAY) &&
1219             (strstr(field->type, "char") || strstr(field->type, "u8") ||
1220              strstr(field->type, "s8")))
1221                 return 1;
1222 
1223         return 0;
1224 }
1225 
1226 static int field_is_dynamic(struct format_field *field)
1227 {
1228         if (strncmp(field->type, "__data_loc", 10) == 0)
1229                 return 1;
1230 
1231         return 0;
1232 }
1233 
1234 static int field_is_long(struct format_field *field)
1235 {
1236         /* includes long long */
1237         if (strstr(field->type, "long"))
1238                 return 1;
1239 
1240         return 0;
1241 }
1242 
1243 static unsigned int type_size(const char *name)
1244 {
1245         /* This covers all FIELD_IS_STRING types. */
1246         static struct {
1247                 const char *type;
1248                 unsigned int size;
1249         } table[] = {
1250                 { "u8",   1 },
1251                 { "u16",  2 },
1252                 { "u32",  4 },
1253                 { "u64",  8 },
1254                 { "s8",   1 },
1255                 { "s16",  2 },
1256                 { "s32",  4 },
1257                 { "s64",  8 },
1258                 { "char", 1 },
1259                 { },
1260         };
1261         int i;
1262 
1263         for (i = 0; table[i].type; i++) {
1264                 if (!strcmp(table[i].type, name))
1265                         return table[i].size;
1266         }
1267 
1268         return 0;
1269 }
1270 
1271 static int event_read_fields(struct event_format *event, struct format_field **fields)
1272 {
1273         struct format_field *field = NULL;
1274         enum event_type type;
1275         char *token;
1276         char *last_token;
1277         int count = 0;
1278 
1279         do {
1280                 unsigned int size_dynamic = 0;
1281 
1282                 type = read_token(&token);
1283                 if (type == EVENT_NEWLINE) {
1284                         free_token(token);
1285                         return count;
1286                 }
1287 
1288                 count++;
1289 
1290                 if (test_type_token(type, token, EVENT_ITEM, "field"))
1291                         goto fail;
1292                 free_token(token);
1293 
1294                 type = read_token(&token);
1295                 /*
1296                  * The ftrace fields may still use the "special" name.
1297                  * Just ignore it.
1298                  */
1299                 if (event->flags & EVENT_FL_ISFTRACE &&
1300                     type == EVENT_ITEM && strcmp(token, "special") == 0) {
1301                         free_token(token);
1302                         type = read_token(&token);
1303                 }
1304 
1305                 if (test_type_token(type, token, EVENT_OP, ":") < 0)
1306                         goto fail;
1307 
1308                 free_token(token);
1309                 if (read_expect_type(EVENT_ITEM, &token) < 0)
1310                         goto fail;
1311 
1312                 last_token = token;
1313 
1314                 field = calloc(1, sizeof(*field));
1315                 if (!field)
1316                         goto fail;
1317 
1318                 field->event = event;
1319 
1320                 /* read the rest of the type */
1321                 for (;;) {
1322                         type = read_token(&token);
1323                         if (type == EVENT_ITEM ||
1324                             (type == EVENT_OP && strcmp(token, "*") == 0) ||
1325                             /*
1326                              * Some of the ftrace fields are broken and have
1327                              * an illegal "." in them.
1328                              */
1329                             (event->flags & EVENT_FL_ISFTRACE &&
1330                              type == EVENT_OP && strcmp(token, ".") == 0)) {
1331 
1332                                 if (strcmp(token, "*") == 0)
1333                                         field->flags |= FIELD_IS_POINTER;
1334 
1335                                 if (field->type) {
1336                                         char *new_type;
1337                                         new_type = realloc(field->type,
1338                                                            strlen(field->type) +
1339                                                            strlen(last_token) + 2);
1340                                         if (!new_type) {
1341                                                 free(last_token);
1342                                                 goto fail;
1343                                         }
1344                                         field->type = new_type;
1345                                         strcat(field->type, " ");
1346                                         strcat(field->type, last_token);
1347                                         free(last_token);
1348                                 } else
1349                                         field->type = last_token;
1350                                 last_token = token;
1351                                 continue;
1352                         }
1353 
1354                         break;
1355                 }
1356 
1357                 if (!field->type) {
1358                         do_warning("%s: no type found", __func__);
1359                         goto fail;
1360                 }
1361                 field->name = last_token;
1362 
1363                 if (test_type(type, EVENT_OP))
1364                         goto fail;
1365 
1366                 if (strcmp(token, "[") == 0) {
1367                         enum event_type last_type = type;
1368                         char *brackets = token;
1369                         char *new_brackets;
1370                         int len;
1371 
1372                         field->flags |= FIELD_IS_ARRAY;
1373 
1374                         type = read_token(&token);
1375 
1376                         if (type == EVENT_ITEM)
1377                                 field->arraylen = strtoul(token, NULL, 0);
1378                         else
1379                                 field->arraylen = 0;
1380 
1381                         while (strcmp(token, "]") != 0) {
1382                                 if (last_type == EVENT_ITEM &&
1383                                     type == EVENT_ITEM)
1384                                         len = 2;
1385                                 else
1386                                         len = 1;
1387                                 last_type = type;
1388 
1389                                 new_brackets = realloc(brackets,
1390                                                        strlen(brackets) +
1391                                                        strlen(token) + len);
1392                                 if (!new_brackets) {
1393                                         free(brackets);
1394                                         goto fail;
1395                                 }
1396                                 brackets = new_brackets;
1397                                 if (len == 2)
1398                                         strcat(brackets, " ");
1399                                 strcat(brackets, token);
1400                                 /* We only care about the last token */
1401                                 field->arraylen = strtoul(token, NULL, 0);
1402                                 free_token(token);
1403                                 type = read_token(&token);
1404                                 if (type == EVENT_NONE) {
1405                                         do_warning("failed to find token");
1406                                         goto fail;
1407                                 }
1408                         }
1409 
1410                         free_token(token);
1411 
1412                         new_brackets = realloc(brackets, strlen(brackets) + 2);
1413                         if (!new_brackets) {
1414                                 free(brackets);
1415                                 goto fail;
1416                         }
1417                         brackets = new_brackets;
1418                         strcat(brackets, "]");
1419 
1420                         /* add brackets to type */
1421 
1422                         type = read_token(&token);
1423                         /*
1424                          * If the next token is not an OP, then it is of
1425                          * the format: type [] item;
1426                          */
1427                         if (type == EVENT_ITEM) {
1428                                 char *new_type;
1429                                 new_type = realloc(field->type,
1430                                                    strlen(field->type) +
1431                                                    strlen(field->name) +
1432                                                    strlen(brackets) + 2);
1433                                 if (!new_type) {
1434                                         free(brackets);
1435                                         goto fail;
1436                                 }
1437                                 field->type = new_type;
1438                                 strcat(field->type, " ");
1439                                 strcat(field->type, field->name);
1440                                 size_dynamic = type_size(field->name);
1441                                 free_token(field->name);
1442                                 strcat(field->type, brackets);
1443                                 field->name = token;
1444                                 type = read_token(&token);
1445                         } else {
1446                                 char *new_type;
1447                                 new_type = realloc(field->type,
1448                                                    strlen(field->type) +
1449                                                    strlen(brackets) + 1);
1450                                 if (!new_type) {
1451                                         free(brackets);
1452                                         goto fail;
1453                                 }
1454                                 field->type = new_type;
1455                                 strcat(field->type, brackets);
1456                         }
1457                         free(brackets);
1458                 }
1459 
1460                 if (field_is_string(field))
1461                         field->flags |= FIELD_IS_STRING;
1462                 if (field_is_dynamic(field))
1463                         field->flags |= FIELD_IS_DYNAMIC;
1464                 if (field_is_long(field))
1465                         field->flags |= FIELD_IS_LONG;
1466 
1467                 if (test_type_token(type, token,  EVENT_OP, ";"))
1468                         goto fail;
1469                 free_token(token);
1470 
1471                 if (read_expected(EVENT_ITEM, "offset") < 0)
1472                         goto fail_expect;
1473 
1474                 if (read_expected(EVENT_OP, ":") < 0)
1475                         goto fail_expect;
1476 
1477                 if (read_expect_type(EVENT_ITEM, &token))
1478                         goto fail;
1479                 field->offset = strtoul(token, NULL, 0);
1480                 free_token(token);
1481 
1482                 if (read_expected(EVENT_OP, ";") < 0)
1483                         goto fail_expect;
1484 
1485                 if (read_expected(EVENT_ITEM, "size") < 0)
1486                         goto fail_expect;
1487 
1488                 if (read_expected(EVENT_OP, ":") < 0)
1489                         goto fail_expect;
1490 
1491                 if (read_expect_type(EVENT_ITEM, &token))
1492                         goto fail;
1493                 field->size = strtoul(token, NULL, 0);
1494                 free_token(token);
1495 
1496                 if (read_expected(EVENT_OP, ";") < 0)
1497                         goto fail_expect;
1498 
1499                 type = read_token(&token);
1500                 if (type != EVENT_NEWLINE) {
1501                         /* newer versions of the kernel have a "signed" type */
1502                         if (test_type_token(type, token, EVENT_ITEM, "signed"))
1503                                 goto fail;
1504 
1505                         free_token(token);
1506 
1507                         if (read_expected(EVENT_OP, ":") < 0)
1508                                 goto fail_expect;
1509 
1510                         if (read_expect_type(EVENT_ITEM, &token))
1511                                 goto fail;
1512 
1513                         if (strtoul(token, NULL, 0))
1514                                 field->flags |= FIELD_IS_SIGNED;
1515 
1516                         free_token(token);
1517                         if (read_expected(EVENT_OP, ";") < 0)
1518                                 goto fail_expect;
1519 
1520                         if (read_expect_type(EVENT_NEWLINE, &token))
1521                                 goto fail;
1522                 }
1523 
1524                 free_token(token);
1525 
1526                 if (field->flags & FIELD_IS_ARRAY) {
1527                         if (field->arraylen)
1528                                 field->elementsize = field->size / field->arraylen;
1529                         else if (field->flags & FIELD_IS_DYNAMIC)
1530                                 field->elementsize = size_dynamic;
1531                         else if (field->flags & FIELD_IS_STRING)
1532                                 field->elementsize = 1;
1533                         else if (field->flags & FIELD_IS_LONG)
1534                                 field->elementsize = event->pevent ?
1535                                                      event->pevent->long_size :
1536                                                      sizeof(long);
1537                 } else
1538                         field->elementsize = field->size;
1539 
1540                 *fields = field;
1541                 fields = &field->next;
1542 
1543         } while (1);
1544 
1545         return 0;
1546 
1547 fail:
1548         free_token(token);
1549 fail_expect:
1550         if (field) {
1551                 free(field->type);
1552                 free(field->name);
1553                 free(field);
1554         }
1555         return -1;
1556 }
1557 
1558 static int event_read_format(struct event_format *event)
1559 {
1560         char *token;
1561         int ret;
1562 
1563         if (read_expected_item(EVENT_ITEM, "format") < 0)
1564                 return -1;
1565 
1566         if (read_expected(EVENT_OP, ":") < 0)
1567                 return -1;
1568 
1569         if (read_expect_type(EVENT_NEWLINE, &token))
1570                 goto fail;
1571         free_token(token);
1572 
1573         ret = event_read_fields(event, &event->format.common_fields);
1574         if (ret < 0)
1575                 return ret;
1576         event->format.nr_common = ret;
1577 
1578         ret = event_read_fields(event, &event->format.fields);
1579         if (ret < 0)
1580                 return ret;
1581         event->format.nr_fields = ret;
1582 
1583         return 0;
1584 
1585  fail:
1586         free_token(token);
1587         return -1;
1588 }
1589 
1590 static enum event_type
1591 process_arg_token(struct event_format *event, struct print_arg *arg,
1592                   char **tok, enum event_type type);
1593 
1594 static enum event_type
1595 process_arg(struct event_format *event, struct print_arg *arg, char **tok)
1596 {
1597         enum event_type type;
1598         char *token;
1599 
1600         type = read_token(&token);
1601         *tok = token;
1602 
1603         return process_arg_token(event, arg, tok, type);
1604 }
1605 
1606 static enum event_type
1607 process_op(struct event_format *event, struct print_arg *arg, char **tok);
1608 
1609 /*
1610  * For __print_symbolic() and __print_flags, we need to completely
1611  * evaluate the first argument, which defines what to print next.
1612  */
1613 static enum event_type
1614 process_field_arg(struct event_format *event, struct print_arg *arg, char **tok)
1615 {
1616         enum event_type type;
1617 
1618         type = process_arg(event, arg, tok);
1619 
1620         while (type == EVENT_OP) {
1621                 type = process_op(event, arg, tok);
1622         }
1623 
1624         return type;
1625 }
1626 
1627 static enum event_type
1628 process_cond(struct event_format *event, struct print_arg *top, char **tok)
1629 {
1630         struct print_arg *arg, *left, *right;
1631         enum event_type type;
1632         char *token = NULL;
1633 
1634         arg = alloc_arg();
1635         left = alloc_arg();
1636         right = alloc_arg();
1637 
1638         if (!arg || !left || !right) {
1639                 do_warning("%s: not enough memory!", __func__);
1640                 /* arg will be freed at out_free */
1641                 free_arg(left);
1642                 free_arg(right);
1643                 goto out_free;
1644         }
1645 
1646         arg->type = PRINT_OP;
1647         arg->op.left = left;
1648         arg->op.right = right;
1649 
1650         *tok = NULL;
1651         type = process_arg(event, left, &token);
1652 
1653  again:
1654         /* Handle other operations in the arguments */
1655         if (type == EVENT_OP && strcmp(token, ":") != 0) {
1656                 type = process_op(event, left, &token);
1657                 goto again;
1658         }
1659 
1660         if (test_type_token(type, token, EVENT_OP, ":"))
1661                 goto out_free;
1662 
1663         arg->op.op = token;
1664 
1665         type = process_arg(event, right, &token);
1666 
1667         top->op.right = arg;
1668 
1669         *tok = token;
1670         return type;
1671 
1672 out_free:
1673         /* Top may point to itself */
1674         top->op.right = NULL;
1675         free_token(token);
1676         free_arg(arg);
1677         return EVENT_ERROR;
1678 }
1679 
1680 static enum event_type
1681 process_array(struct event_format *event, struct print_arg *top, char **tok)
1682 {
1683         struct print_arg *arg;
1684         enum event_type type;
1685         char *token = NULL;
1686 
1687         arg = alloc_arg();
1688         if (!arg) {
1689                 do_warning("%s: not enough memory!", __func__);
1690                 /* '*tok' is set to top->op.op.  No need to free. */
1691                 *tok = NULL;
1692                 return EVENT_ERROR;
1693         }
1694 
1695         *tok = NULL;
1696         type = process_arg(event, arg, &token);
1697         if (test_type_token(type, token, EVENT_OP, "]"))
1698                 goto out_free;
1699 
1700         top->op.right = arg;
1701 
1702         free_token(token);
1703         type = read_token_item(&token);
1704         *tok = token;
1705 
1706         return type;
1707 
1708 out_free:
1709         free_token(token);
1710         free_arg(arg);
1711         return EVENT_ERROR;
1712 }
1713 
1714 static int get_op_prio(char *op)
1715 {
1716         if (!op[1]) {
1717                 switch (op[0]) {
1718                 case '~':
1719                 case '!':
1720                         return 4;
1721                 case '*':
1722                 case '/':
1723                 case '%':
1724                         return 6;
1725                 case '+':
1726                 case '-':
1727                         return 7;
1728                         /* '>>' and '<<' are 8 */
1729                 case '<':
1730                 case '>':
1731                         return 9;
1732                         /* '==' and '!=' are 10 */
1733                 case '&':
1734                         return 11;
1735                 case '^':
1736                         return 12;
1737                 case '|':
1738                         return 13;
1739                 case '?':
1740                         return 16;
1741                 default:
1742                         do_warning("unknown op '%c'", op[0]);
1743                         return -1;
1744                 }
1745         } else {
1746                 if (strcmp(op, "++") == 0 ||
1747                     strcmp(op, "--") == 0) {
1748                         return 3;
1749                 } else if (strcmp(op, ">>") == 0 ||
1750                            strcmp(op, "<<") == 0) {
1751                         return 8;
1752                 } else if (strcmp(op, ">=") == 0 ||
1753                            strcmp(op, "<=") == 0) {
1754                         return 9;
1755                 } else if (strcmp(op, "==") == 0 ||
1756                            strcmp(op, "!=") == 0) {
1757                         return 10;
1758                 } else if (strcmp(op, "&&") == 0) {
1759                         return 14;
1760                 } else if (strcmp(op, "||") == 0) {
1761                         return 15;
1762                 } else {
1763                         do_warning("unknown op '%s'", op);
1764                         return -1;
1765                 }
1766         }
1767 }
1768 
1769 static int set_op_prio(struct print_arg *arg)
1770 {
1771 
1772         /* single ops are the greatest */
1773         if (!arg->op.left || arg->op.left->type == PRINT_NULL)
1774                 arg->op.prio = 0;
1775         else
1776                 arg->op.prio = get_op_prio(arg->op.op);
1777 
1778         return arg->op.prio;
1779 }
1780 
1781 /* Note, *tok does not get freed, but will most likely be saved */
1782 static enum event_type
1783 process_op(struct event_format *event, struct print_arg *arg, char **tok)
1784 {
1785         struct print_arg *left, *right = NULL;
1786         enum event_type type;
1787         char *token;
1788 
1789         /* the op is passed in via tok */
1790         token = *tok;
1791 
1792         if (arg->type == PRINT_OP && !arg->op.left) {
1793                 /* handle single op */
1794                 if (token[1]) {
1795                         do_warning("bad op token %s", token);
1796                         goto out_free;
1797                 }
1798                 switch (token[0]) {
1799                 case '~':
1800                 case '!':
1801                 case '+':
1802                 case '-':
1803                         break;
1804                 default:
1805                         do_warning("bad op token %s", token);
1806                         goto out_free;
1807 
1808                 }
1809 
1810                 /* make an empty left */
1811                 left = alloc_arg();
1812                 if (!left)
1813                         goto out_warn_free;
1814 
1815                 left->type = PRINT_NULL;
1816                 arg->op.left = left;
1817 
1818                 right = alloc_arg();
1819                 if (!right)
1820                         goto out_warn_free;
1821 
1822                 arg->op.right = right;
1823 
1824                 /* do not free the token, it belongs to an op */
1825                 *tok = NULL;
1826                 type = process_arg(event, right, tok);
1827 
1828         } else if (strcmp(token, "?") == 0) {
1829 
1830                 left = alloc_arg();
1831                 if (!left)
1832                         goto out_warn_free;
1833 
1834                 /* copy the top arg to the left */
1835                 *left = *arg;
1836 
1837                 arg->type = PRINT_OP;
1838                 arg->op.op = token;
1839                 arg->op.left = left;
1840                 arg->op.prio = 0;
1841 
1842                 /* it will set arg->op.right */
1843                 type = process_cond(event, arg, tok);
1844 
1845         } else if (strcmp(token, ">>") == 0 ||
1846                    strcmp(token, "<<") == 0 ||
1847                    strcmp(token, "&") == 0 ||
1848                    strcmp(token, "|") == 0 ||
1849                    strcmp(token, "&&") == 0 ||
1850                    strcmp(token, "||") == 0 ||
1851                    strcmp(token, "-") == 0 ||
1852                    strcmp(token, "+") == 0 ||
1853                    strcmp(token, "*") == 0 ||
1854                    strcmp(token, "^") == 0 ||
1855                    strcmp(token, "/") == 0 ||
1856                    strcmp(token, "<") == 0 ||
1857                    strcmp(token, ">") == 0 ||
1858                    strcmp(token, "<=") == 0 ||
1859                    strcmp(token, ">=") == 0 ||
1860                    strcmp(token, "==") == 0 ||
1861                    strcmp(token, "!=") == 0) {
1862 
1863                 left = alloc_arg();
1864                 if (!left)
1865                         goto out_warn_free;
1866 
1867                 /* copy the top arg to the left */
1868                 *left = *arg;
1869 
1870                 arg->type = PRINT_OP;
1871                 arg->op.op = token;
1872                 arg->op.left = left;
1873                 arg->op.right = NULL;
1874 
1875                 if (set_op_prio(arg) == -1) {
1876                         event->flags |= EVENT_FL_FAILED;
1877                         /* arg->op.op (= token) will be freed at out_free */
1878                         arg->op.op = NULL;
1879                         goto out_free;
1880                 }
1881 
1882                 type = read_token_item(&token);
1883                 *tok = token;
1884 
1885                 /* could just be a type pointer */
1886                 if ((strcmp(arg->op.op, "*") == 0) &&
1887                     type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
1888                         char *new_atom;
1889 
1890                         if (left->type != PRINT_ATOM) {
1891                                 do_warning("bad pointer type");
1892                                 goto out_free;
1893                         }
1894                         new_atom = realloc(left->atom.atom,
1895                                             strlen(left->atom.atom) + 3);
1896                         if (!new_atom)
1897                                 goto out_warn_free;
1898 
1899                         left->atom.atom = new_atom;
1900                         strcat(left->atom.atom, " *");
1901                         free(arg->op.op);
1902                         *arg = *left;
1903                         free(left);
1904 
1905                         return type;
1906                 }
1907 
1908                 right = alloc_arg();
1909                 if (!right)
1910                         goto out_warn_free;
1911 
1912                 type = process_arg_token(event, right, tok, type);
1913                 arg->op.right = right;
1914 
1915         } else if (strcmp(token, "[") == 0) {
1916 
1917                 left = alloc_arg();
1918                 if (!left)
1919                         goto out_warn_free;
1920 
1921                 *left = *arg;
1922 
1923                 arg->type = PRINT_OP;
1924                 arg->op.op = token;
1925                 arg->op.left = left;
1926 
1927                 arg->op.prio = 0;
1928 
1929                 /* it will set arg->op.right */
1930                 type = process_array(event, arg, tok);
1931 
1932         } else {
1933                 do_warning("unknown op '%s'", token);
1934                 event->flags |= EVENT_FL_FAILED;
1935                 /* the arg is now the left side */
1936                 goto out_free;
1937         }
1938 
1939         if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
1940                 int prio;
1941 
1942                 /* higher prios need to be closer to the root */
1943                 prio = get_op_prio(*tok);
1944 
1945                 if (prio > arg->op.prio)
1946                         return process_op(event, arg, tok);
1947 
1948                 return process_op(event, right, tok);
1949         }
1950 
1951         return type;
1952 
1953 out_warn_free:
1954         do_warning("%s: not enough memory!", __func__);
1955 out_free:
1956         free_token(token);
1957         *tok = NULL;
1958         return EVENT_ERROR;
1959 }
1960 
1961 static enum event_type
1962 process_entry(struct event_format *event __maybe_unused, struct print_arg *arg,
1963               char **tok)
1964 {
1965         enum event_type type;
1966         char *field;
1967         char *token;
1968 
1969         if (read_expected(EVENT_OP, "->") < 0)
1970                 goto out_err;
1971 
1972         if (read_expect_type(EVENT_ITEM, &token) < 0)
1973                 goto out_free;
1974         field = token;
1975 
1976         arg->type = PRINT_FIELD;
1977         arg->field.name = field;
1978 
1979         if (is_flag_field) {
1980                 arg->field.field = pevent_find_any_field(event, arg->field.name);
1981                 arg->field.field->flags |= FIELD_IS_FLAG;
1982                 is_flag_field = 0;
1983         } else if (is_symbolic_field) {
1984                 arg->field.field = pevent_find_any_field(event, arg->field.name);
1985                 arg->field.field->flags |= FIELD_IS_SYMBOLIC;
1986                 is_symbolic_field = 0;
1987         }
1988 
1989         type = read_token(&token);
1990         *tok = token;
1991 
1992         return type;
1993 
1994  out_free:
1995         free_token(token);
1996  out_err:
1997         *tok = NULL;
1998         return EVENT_ERROR;
1999 }
2000 
2001 static char *arg_eval (struct print_arg *arg);
2002 
2003 static unsigned long long
2004 eval_type_str(unsigned long long val, const char *type, int pointer)
2005 {
2006         int sign = 0;
2007         char *ref;
2008         int len;
2009 
2010         len = strlen(type);
2011 
2012         if (pointer) {
2013 
2014                 if (type[len-1] != '*') {
2015                         do_warning("pointer expected with non pointer type");
2016                         return val;
2017                 }
2018 
2019                 ref = malloc(len);
2020                 if (!ref) {
2021                         do_warning("%s: not enough memory!", __func__);
2022                         return val;
2023                 }
2024                 memcpy(ref, type, len);
2025 
2026                 /* chop off the " *" */
2027                 ref[len - 2] = 0;
2028 
2029                 val = eval_type_str(val, ref, 0);
2030                 free(ref);
2031                 return val;
2032         }
2033 
2034         /* check if this is a pointer */
2035         if (type[len - 1] == '*')
2036                 return val;
2037 
2038         /* Try to figure out the arg size*/
2039         if (strncmp(type, "struct", 6) == 0)
2040                 /* all bets off */
2041                 return val;
2042 
2043         if (strcmp(type, "u8") == 0)
2044                 return val & 0xff;
2045 
2046         if (strcmp(type, "u16") == 0)
2047                 return val & 0xffff;
2048 
2049         if (strcmp(type, "u32") == 0)
2050                 return val & 0xffffffff;
2051 
2052         if (strcmp(type, "u64") == 0 ||
2053             strcmp(type, "s64"))
2054                 return val;
2055 
2056         if (strcmp(type, "s8") == 0)
2057                 return (unsigned long long)(char)val & 0xff;
2058 
2059         if (strcmp(type, "s16") == 0)
2060                 return (unsigned long long)(short)val & 0xffff;
2061 
2062         if (strcmp(type, "s32") == 0)
2063                 return (unsigned long long)(int)val & 0xffffffff;
2064 
2065         if (strncmp(type, "unsigned ", 9) == 0) {
2066                 sign = 0;
2067                 type += 9;
2068         }
2069 
2070         if (strcmp(type, "char") == 0) {
2071                 if (sign)
2072                         return (unsigned long long)(char)val & 0xff;
2073                 else
2074                         return val & 0xff;
2075         }
2076 
2077         if (strcmp(type, "short") == 0) {
2078                 if (sign)
2079                         return (unsigned long long)(short)val & 0xffff;
2080                 else
2081                         return val & 0xffff;
2082         }
2083 
2084         if (strcmp(type, "int") == 0) {
2085                 if (sign)
2086                         return (unsigned long long)(int)val & 0xffffffff;
2087                 else
2088                         return val & 0xffffffff;
2089         }
2090 
2091         return val;
2092 }
2093 
2094 /*
2095  * Try to figure out the type.
2096  */
2097 static unsigned long long
2098 eval_type(unsigned long long val, struct print_arg *arg, int pointer)
2099 {
2100         if (arg->type != PRINT_TYPE) {
2101                 do_warning("expected type argument");
2102                 return 0;
2103         }
2104 
2105         return eval_type_str(val, arg->typecast.type, pointer);
2106 }
2107 
2108 static int arg_num_eval(struct print_arg *arg, long long *val)
2109 {
2110         long long left, right;
2111         int ret = 1;
2112 
2113         switch (arg->type) {
2114         case PRINT_ATOM:
2115                 *val = strtoll(arg->atom.atom, NULL, 0);
2116                 break;
2117         case PRINT_TYPE:
2118                 ret = arg_num_eval(arg->typecast.item, val);
2119                 if (!ret)
2120                         break;
2121                 *val = eval_type(*val, arg, 0);
2122                 break;
2123         case PRINT_OP:
2124                 switch (arg->op.op[0]) {
2125                 case '|':
2126                         ret = arg_num_eval(arg->op.left, &left);
2127                         if (!ret)
2128                                 break;
2129                         ret = arg_num_eval(arg->op.right, &right);
2130                         if (!ret)
2131                                 break;
2132                         if (arg->op.op[1])
2133                                 *val = left || right;
2134                         else
2135                                 *val = left | right;
2136                         break;
2137                 case '&':
2138                         ret = arg_num_eval(arg->op.left, &left);
2139                         if (!ret)
2140                                 break;
2141                         ret = arg_num_eval(arg->op.right, &right);
2142                         if (!ret)
2143                                 break;
2144                         if (arg->op.op[1])
2145                                 *val = left && right;
2146                         else
2147                                 *val = left & right;
2148                         break;
2149                 case '<':
2150                         ret = arg_num_eval(arg->op.left, &left);
2151                         if (!ret)
2152                                 break;
2153                         ret = arg_num_eval(arg->op.right, &right);
2154                         if (!ret)
2155                                 break;
2156                         switch (arg->op.op[1]) {
2157                         case 0:
2158                                 *val = left < right;
2159                                 break;
2160                         case '<':
2161                                 *val = left << right;
2162                                 break;
2163                         case '=':
2164                                 *val = left <= right;
2165                                 break;
2166                         default:
2167                                 do_warning("unknown op '%s'", arg->op.op);
2168                                 ret = 0;
2169                         }
2170                         break;
2171                 case '>':
2172                         ret = arg_num_eval(arg->op.left, &left);
2173                         if (!ret)
2174                                 break;
2175                         ret = arg_num_eval(arg->op.right, &right);
2176                         if (!ret)
2177                                 break;
2178                         switch (arg->op.op[1]) {
2179                         case 0:
2180                                 *val = left > right;
2181                                 break;
2182                         case '>':
2183                                 *val = left >> right;
2184                                 break;
2185                         case '=':
2186                                 *val = left >= right;
2187                                 break;
2188                         default:
2189                                 do_warning("unknown op '%s'", arg->op.op);
2190                                 ret = 0;
2191                         }
2192                         break;
2193                 case '=':
2194                         ret = arg_num_eval(arg->op.left, &left);
2195                         if (!ret)
2196                                 break;
2197                         ret = arg_num_eval(arg->op.right, &right);
2198                         if (!ret)
2199                                 break;
2200 
2201                         if (arg->op.op[1] != '=') {
2202                                 do_warning("unknown op '%s'", arg->op.op);
2203                                 ret = 0;
2204                         } else
2205                                 *val = left == right;
2206                         break;
2207                 case '!':
2208                         ret = arg_num_eval(arg->op.left, &left);
2209                         if (!ret)
2210                                 break;
2211                         ret = arg_num_eval(arg->op.right, &right);
2212                         if (!ret)
2213                                 break;
2214 
2215                         switch (arg->op.op[1]) {
2216                         case '=':
2217                                 *val = left != right;
2218                                 break;
2219                         default:
2220                                 do_warning("unknown op '%s'", arg->op.op);
2221                                 ret = 0;
2222                         }
2223                         break;
2224                 case '-':
2225                         /* check for negative */
2226                         if (arg->op.left->type == PRINT_NULL)
2227                                 left = 0;
2228                         else
2229                                 ret = arg_num_eval(arg->op.left, &left);
2230                         if (!ret)
2231                                 break;
2232                         ret = arg_num_eval(arg->op.right, &right);
2233                         if (!ret)
2234                                 break;
2235                         *val = left - right;
2236                         break;
2237                 case '+':
2238                         if (arg->op.left->type == PRINT_NULL)
2239                                 left = 0;
2240                         else
2241                                 ret = arg_num_eval(arg->op.left, &left);
2242                         if (!ret)
2243                                 break;
2244                         ret = arg_num_eval(arg->op.right, &right);
2245                         if (!ret)
2246                                 break;
2247                         *val = left + right;
2248                         break;
2249                 default:
2250                         do_warning("unknown op '%s'", arg->op.op);
2251                         ret = 0;
2252                 }
2253                 break;
2254 
2255         case PRINT_NULL:
2256         case PRINT_FIELD ... PRINT_SYMBOL:
2257         case PRINT_STRING:
2258         case PRINT_BSTRING:
2259         default:
2260                 do_warning("invalid eval type %d", arg->type);
2261                 ret = 0;
2262 
2263         }
2264         return ret;
2265 }
2266 
2267 static char *arg_eval (struct print_arg *arg)
2268 {
2269         long long val;
2270         static char buf[20];
2271 
2272         switch (arg->type) {
2273         case PRINT_ATOM:
2274                 return arg->atom.atom;
2275         case PRINT_TYPE:
2276                 return arg_eval(arg->typecast.item);
2277         case PRINT_OP:
2278                 if (!arg_num_eval(arg, &val))
2279                         break;
2280                 sprintf(buf, "%lld", val);
2281                 return buf;
2282 
2283         case PRINT_NULL:
2284         case PRINT_FIELD ... PRINT_SYMBOL:
2285         case PRINT_STRING:
2286         case PRINT_BSTRING:
2287         default:
2288                 do_warning("invalid eval type %d", arg->type);
2289                 break;
2290         }
2291 
2292         return NULL;
2293 }
2294 
2295 static enum event_type
2296 process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
2297 {
2298         enum event_type type;
2299         struct print_arg *arg = NULL;
2300         struct print_flag_sym *field;
2301         char *token = *tok;
2302         char *value;
2303 
2304         do {
2305                 free_token(token);
2306                 type = read_token_item(&token);
2307                 if (test_type_token(type, token, EVENT_OP, "{"))
2308                         break;
2309 
2310                 arg = alloc_arg();
2311                 if (!arg)
2312                         goto out_free;
2313 
2314                 free_token(token);
2315                 type = process_arg(event, arg, &token);
2316 
2317                 if (type == EVENT_OP)
2318                         type = process_op(event, arg, &token);
2319 
2320                 if (type == EVENT_ERROR)
2321                         goto out_free;
2322 
2323                 if (test_type_token(type, token, EVENT_DELIM, ","))
2324                         goto out_free;
2325 
2326                 field = calloc(1, sizeof(*field));
2327                 if (!field)
2328                         goto out_free;
2329 
2330                 value = arg_eval(arg);
2331                 if (value == NULL)
2332                         goto out_free_field;
2333                 field->value = strdup(value);
2334                 if (field->value == NULL)
2335                         goto out_free_field;
2336 
2337                 free_arg(arg);
2338                 arg = alloc_arg();
2339                 if (!arg)
2340                         goto out_free;
2341 
2342                 free_token(token);
2343                 type = process_arg(event, arg, &token);
2344                 if (test_type_token(type, token, EVENT_OP, "}"))
2345                         goto out_free_field;
2346 
2347                 value = arg_eval(arg);
2348                 if (value == NULL)
2349                         goto out_free_field;
2350                 field->str = strdup(value);
2351                 if (field->str == NULL)
2352                         goto out_free_field;
2353                 free_arg(arg);
2354                 arg = NULL;
2355 
2356                 *list = field;
2357                 list = &field->next;
2358 
2359                 free_token(token);
2360                 type = read_token_item(&token);
2361         } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
2362 
2363         *tok = token;
2364         return type;
2365 
2366 out_free_field:
2367         free_flag_sym(field);
2368 out_free:
2369         free_arg(arg);
2370         free_token(token);
2371         *tok = NULL;
2372 
2373         return EVENT_ERROR;
2374 }
2375 
2376 static enum event_type
2377 process_flags(struct event_format *event, struct print_arg *arg, char **tok)
2378 {
2379         struct print_arg *field;
2380         enum event_type type;
2381         char *token;
2382 
2383         memset(arg, 0, sizeof(*arg));
2384         arg->type = PRINT_FLAGS;
2385 
2386         field = alloc_arg();
2387         if (!field) {
2388                 do_warning("%s: not enough memory!", __func__);
2389                 goto out_free;
2390         }
2391 
2392         type = process_field_arg(event, field, &token);
2393 
2394         /* Handle operations in the first argument */
2395         while (type == EVENT_OP)
2396                 type = process_op(event, field, &token);
2397 
2398         if (test_type_token(type, token, EVENT_DELIM, ","))
2399                 goto out_free_field;
2400         free_token(token);
2401 
2402         arg->flags.field = field;
2403 
2404         type = read_token_item(&token);
2405         if (event_item_type(type)) {
2406                 arg->flags.delim = token;
2407                 type = read_token_item(&token);
2408         }
2409 
2410         if (test_type_token(type, token, EVENT_DELIM, ","))
2411                 goto out_free;
2412 
2413         type = process_fields(event, &arg->flags.flags, &token);
2414         if (test_type_token(type, token, EVENT_DELIM, ")"))
2415                 goto out_free;
2416 
2417         free_token(token);
2418         type = read_token_item(tok);
2419         return type;
2420 
2421 out_free_field:
2422         free_arg(field);
2423 out_free:
2424         free_token(token);
2425         *tok = NULL;
2426         return EVENT_ERROR;
2427 }
2428 
2429 static enum event_type
2430 process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
2431 {
2432         struct print_arg *field;
2433         enum event_type type;
2434         char *token;
2435 
2436         memset(arg, 0, sizeof(*arg));
2437         arg->type = PRINT_SYMBOL;
2438 
2439         field = alloc_arg();
2440         if (!field) {
2441                 do_warning("%s: not enough memory!", __func__);
2442                 goto out_free;
2443         }
2444 
2445         type = process_field_arg(event, field, &token);
2446 
2447         if (test_type_token(type, token, EVENT_DELIM, ","))
2448                 goto out_free_field;
2449 
2450         arg->symbol.field = field;
2451 
2452         type = process_fields(event, &arg->symbol.symbols, &token);
2453         if (test_type_token(type, token, EVENT_DELIM, ")"))
2454                 goto out_free;
2455 
2456         free_token(token);
2457         type = read_token_item(tok);
2458         return type;
2459 
2460 out_free_field:
2461         free_arg(field);
2462 out_free:
2463         free_token(token);
2464         *tok = NULL;
2465         return EVENT_ERROR;
2466 }
2467 
2468 static enum event_type
2469 process_hex(struct event_format *event, struct print_arg *arg, char **tok)
2470 {
2471         struct print_arg *field;
2472         enum event_type type;
2473         char *token;
2474 
2475         memset(arg, 0, sizeof(*arg));
2476         arg->type = PRINT_HEX;
2477 
2478         field = alloc_arg();
2479         if (!field) {
2480                 do_warning("%s: not enough memory!", __func__);
2481                 goto out_free;
2482         }
2483 
2484         type = process_arg(event, field, &token);
2485 
2486         if (test_type_token(type, token, EVENT_DELIM, ","))
2487                 goto out_free;
2488 
2489         arg->hex.field = field;
2490 
2491         free_token(token);
2492 
2493         field = alloc_arg();
2494         if (!field) {
2495                 do_warning("%s: not enough memory!", __func__);
2496                 *tok = NULL;
2497                 return EVENT_ERROR;
2498         }
2499 
2500         type = process_arg(event, field, &token);
2501 
2502         if (test_type_token(type, token, EVENT_DELIM, ")"))
2503                 goto out_free;
2504 
2505         arg->hex.size = field;
2506 
2507         free_token(token);
2508         type = read_token_item(tok);
2509         return type;
2510 
2511  out_free:
2512         free_arg(field);
2513         free_token(token);
2514         *tok = NULL;
2515         return EVENT_ERROR;
2516 }
2517 
2518 static enum event_type
2519 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
2520 {
2521         struct format_field *field;
2522         enum event_type type;
2523         char *token;
2524 
2525         memset(arg, 0, sizeof(*arg));
2526         arg->type = PRINT_DYNAMIC_ARRAY;
2527 
2528         /*
2529          * The item within the parenthesis is another field that holds
2530          * the index into where the array starts.
2531          */
2532         type = read_token(&token);
2533         *tok = token;
2534         if (type != EVENT_ITEM)
2535                 goto out_free;
2536 
2537         /* Find the field */
2538 
2539         field = pevent_find_field(event, token);
2540         if (!field)
2541                 goto out_free;
2542 
2543         arg->dynarray.field = field;
2544         arg->dynarray.index = 0;
2545 
2546         if (read_expected(EVENT_DELIM, ")") < 0)
2547                 goto out_free;
2548 
2549         free_token(token);
2550         type = read_token_item(&token);
2551         *tok = token;
2552         if (type != EVENT_OP || strcmp(token, "[") != 0)
2553                 return type;
2554 
2555         free_token(token);
2556         arg = alloc_arg();
2557         if (!arg) {
2558                 do_warning("%s: not enough memory!", __func__);
2559                 *tok = NULL;
2560                 return EVENT_ERROR;
2561         }
2562 
2563         type = process_arg(event, arg, &token);
2564         if (type == EVENT_ERROR)
2565                 goto out_free_arg;
2566 
2567         if (!test_type_token(type, token, EVENT_OP, "]"))
2568                 goto out_free_arg;
2569 
2570         free_token(token);
2571         type = read_token_item(tok);
2572         return type;
2573 
2574  out_free_arg:
2575         free_arg(arg);
2576  out_free:
2577         free_token(token);
2578         *tok = NULL;
2579         return EVENT_ERROR;
2580 }
2581 
2582 static enum event_type
2583 process_paren(struct event_format *event, struct print_arg *arg, char **tok)
2584 {
2585         struct print_arg *item_arg;
2586         enum event_type type;
2587         char *token;
2588 
2589         type = process_arg(event, arg, &token);
2590 
2591         if (type == EVENT_ERROR)
2592                 goto out_free;
2593 
2594         if (type == EVENT_OP)
2595                 type = process_op(event, arg, &token);
2596 
2597         if (type == EVENT_ERROR)
2598                 goto out_free;
2599 
2600         if (test_type_token(type, token, EVENT_DELIM, ")"))
2601                 goto out_free;
2602 
2603         free_token(token);
2604         type = read_token_item(&token);
2605 
2606         /*
2607          * If the next token is an item or another open paren, then
2608          * this was a typecast.
2609          */
2610         if (event_item_type(type) ||
2611             (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
2612 
2613                 /* make this a typecast and contine */
2614 
2615                 /* prevous must be an atom */
2616                 if (arg->type != PRINT_ATOM) {
2617                         do_warning("previous needed to be PRINT_ATOM");
2618                         goto out_free;
2619                 }
2620 
2621                 item_arg = alloc_arg();
2622                 if (!item_arg) {
2623                         do_warning("%s: not enough memory!", __func__);
2624                         goto out_free;
2625                 }
2626 
2627                 arg->type = PRINT_TYPE;
2628                 arg->typecast.type = arg->atom.atom;
2629                 arg->typecast.item = item_arg;
2630                 type = process_arg_token(event, item_arg, &token, type);
2631 
2632         }
2633 
2634         *tok = token;
2635         return type;
2636 
2637  out_free:
2638         free_token(token);
2639         *tok = NULL;
2640         return EVENT_ERROR;
2641 }
2642 
2643 
2644 static enum event_type
2645 process_str(struct event_format *event __maybe_unused, struct print_arg *arg,
2646             char **tok)
2647 {
2648         enum event_type type;
2649         char *token;
2650 
2651         if (read_expect_type(EVENT_ITEM, &token) < 0)
2652                 goto out_free;
2653 
2654         arg->type = PRINT_STRING;
2655         arg->string.string = token;
2656         arg->string.offset = -1;
2657 
2658         if (read_expected(EVENT_DELIM, ")") < 0)
2659                 goto out_err;
2660 
2661         type = read_token(&token);
2662         *tok = token;
2663 
2664         return type;
2665 
2666  out_free:
2667         free_token(token);
2668  out_err:
2669         *tok = NULL;
2670         return EVENT_ERROR;
2671 }
2672 
2673 static struct pevent_function_handler *
2674 find_func_handler(struct pevent *pevent, char *func_name)
2675 {
2676         struct pevent_function_handler *func;
2677 
2678         if (!pevent)
2679                 return NULL;
2680 
2681         for (func = pevent->func_handlers; func; func = func->next) {
2682                 if (strcmp(func->name, func_name) == 0)
2683                         break;
2684         }
2685 
2686         return func;
2687 }
2688 
2689 static void remove_func_handler(struct pevent *pevent, char *func_name)
2690 {
2691         struct pevent_function_handler *func;
2692         struct pevent_function_handler **next;
2693 
2694         next = &pevent->func_handlers;
2695         while ((func = *next)) {
2696                 if (strcmp(func->name, func_name) == 0) {
2697                         *next = func->next;
2698                         free_func_handle(func);
2699                         break;
2700                 }
2701                 next = &func->next;
2702         }
2703 }
2704 
2705 static enum event_type
2706 process_func_handler(struct event_format *event, struct pevent_function_handler *func,
2707                      struct print_arg *arg, char **tok)
2708 {
2709         struct print_arg **next_arg;
2710         struct print_arg *farg;
2711         enum event_type type;
2712         char *token;
2713         const char *test;
2714         int i;
2715 
2716         arg->type = PRINT_FUNC;
2717         arg->func.func = func;
2718 
2719         *tok = NULL;
2720 
2721         next_arg = &(arg->func.args);
2722         for (i = 0; i < func->nr_args; i++) {
2723                 farg = alloc_arg();
2724                 if (!farg) {
2725                         do_warning("%s: not enough memory!", __func__);
2726                         return EVENT_ERROR;
2727                 }
2728 
2729                 type = process_arg(event, farg, &token);
2730                 if (i < (func->nr_args - 1))
2731                         test = ",";
2732                 else
2733                         test = ")";
2734 
2735                 if (test_type_token(type, token, EVENT_DELIM, test)) {
2736                         free_arg(farg);
2737                         free_token(token);
2738                         return EVENT_ERROR;
2739                 }
2740 
2741                 *next_arg = farg;
2742                 next_arg = &(farg->next);
2743                 free_token(token);
2744         }
2745 
2746         type = read_token(&token);
2747         *tok = token;
2748 
2749         return type;
2750 }
2751 
2752 static enum event_type
2753 process_function(struct event_format *event, struct print_arg *arg,
2754                  char *token, char **tok)
2755 {
2756         struct pevent_function_handler *func;
2757 
2758         if (strcmp(token, "__print_flags") == 0) {
2759                 free_token(token);
2760                 is_flag_field = 1;
2761                 return process_flags(event, arg, tok);
2762         }
2763         if (strcmp(token, "__print_symbolic") == 0) {
2764                 free_token(token);
2765                 is_symbolic_field = 1;
2766                 return process_symbols(event, arg, tok);
2767         }
2768         if (strcmp(token, "__print_hex") == 0) {
2769                 free_token(token);
2770                 return process_hex(event, arg, tok);
2771         }
2772         if (strcmp(token, "__get_str") == 0) {
2773                 free_token(token);
2774                 return process_str(event, arg, tok);
2775         }
2776         if (strcmp(token, "__get_dynamic_array") == 0) {
2777                 free_token(token);
2778                 return process_dynamic_array(event, arg, tok);
2779         }
2780 
2781         func = find_func_handler(event->pevent, token);
2782         if (func) {
2783                 free_token(token);
2784                 return process_func_handler(event, func, arg, tok);
2785         }
2786 
2787         do_warning("function %s not defined", token);
2788         free_token(token);
2789         return EVENT_ERROR;
2790 }
2791 
2792 static enum event_type
2793 process_arg_token(struct event_format *event, struct print_arg *arg,
2794                   char **tok, enum event_type type)
2795 {
2796         char *token;
2797         char *atom;
2798 
2799         token = *tok;
2800 
2801         switch (type) {
2802         case EVENT_ITEM:
2803                 if (strcmp(token, "REC") == 0) {
2804                         free_token(token);
2805                         type = process_entry(event, arg, &token);
2806                         break;
2807                 }
2808                 atom = token;
2809                 /* test the next token */
2810                 type = read_token_item(&token);
2811 
2812                 /*
2813                  * If the next token is a parenthesis, then this
2814                  * is a function.
2815                  */
2816                 if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
2817                         free_token(token);
2818                         token = NULL;
2819                         /* this will free atom. */
2820                         type = process_function(event, arg, atom, &token);
2821                         break;
2822                 }
2823                 /* atoms can be more than one token long */
2824                 while (type == EVENT_ITEM) {
2825                         char *new_atom;
2826                         new_atom = realloc(atom,
2827                                            strlen(atom) + strlen(token) + 2);
2828                         if (!new_atom) {
2829                                 free(atom);
2830                                 *tok = NULL;
2831                                 free_token(token);
2832                                 return EVENT_ERROR;
2833                         }
2834                         atom = new_atom;
2835                         strcat(atom, " ");
2836                         strcat(atom, token);
2837                         free_token(token);
2838                         type = read_token_item(&token);
2839                 }
2840 
2841                 arg->type = PRINT_ATOM;
2842                 arg->atom.atom = atom;
2843                 break;
2844 
2845         case EVENT_DQUOTE:
2846         case EVENT_SQUOTE:
2847                 arg->type = PRINT_ATOM;
2848                 arg->atom.atom = token;
2849                 type = read_token_item(&token);
2850                 break;
2851         case EVENT_DELIM:
2852                 if (strcmp(token, "(") == 0) {
2853                         free_token(token);
2854                         type = process_paren(event, arg, &token);
2855                         break;
2856                 }
2857         case EVENT_OP:
2858                 /* handle single ops */
2859                 arg->type = PRINT_OP;
2860                 arg->op.op = token;
2861                 arg->op.left = NULL;
2862                 type = process_op(event, arg, &token);
2863 
2864                 /* On error, the op is freed */
2865                 if (type == EVENT_ERROR)
2866                         arg->op.op = NULL;
2867 
2868                 /* return error type if errored */
2869                 break;
2870 
2871         case EVENT_ERROR ... EVENT_NEWLINE:
2872         default:
2873                 do_warning("unexpected type %d", type);
2874                 return EVENT_ERROR;
2875         }
2876         *tok = token;
2877 
2878         return type;
2879 }
2880 
2881 static int event_read_print_args(struct event_format *event, struct print_arg **list)
2882 {
2883         enum event_type type = EVENT_ERROR;
2884         struct print_arg *arg;
2885         char *token;
2886         int args = 0;
2887 
2888         do {
2889                 if (type == EVENT_NEWLINE) {
2890                         type = read_token_item(&token);
2891                         continue;
2892                 }
2893 
2894                 arg = alloc_arg();
2895                 if (!arg) {
2896                         do_warning("%s: not enough memory!", __func__);
2897                         return -1;
2898                 }
2899 
2900                 type = process_arg(event, arg, &token);
2901 
2902                 if (type == EVENT_ERROR) {
2903                         free_token(token);
2904                         free_arg(arg);
2905                         return -1;
2906                 }
2907 
2908                 *list = arg;
2909                 args++;
2910 
2911                 if (type == EVENT_OP) {
2912                         type = process_op(event, arg, &token);
2913                         free_token(token);
2914                         if (type == EVENT_ERROR) {
2915                                 *list = NULL;
2916                                 free_arg(arg);
2917                                 return -1;
2918                         }
2919                         list = &arg->next;
2920                         continue;
2921                 }
2922 
2923                 if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
2924                         free_token(token);
2925                         *list = arg;
2926                         list = &arg->next;
2927                         continue;
2928                 }
2929                 break;
2930         } while (type != EVENT_NONE);
2931 
2932         if (type != EVENT_NONE && type != EVENT_ERROR)
2933                 free_token(token);
2934 
2935         return args;
2936 }
2937 
2938 static int event_read_print(struct event_format *event)
2939 {
2940         enum event_type type;
2941         char *token;
2942         int ret;
2943 
2944         if (read_expected_item(EVENT_ITEM, "print") < 0)
2945                 return -1;
2946 
2947         if (read_expected(EVENT_ITEM, "fmt") < 0)
2948                 return -1;
2949 
2950         if (read_expected(EVENT_OP, ":") < 0)
2951                 return -1;
2952 
2953         if (read_expect_type(EVENT_DQUOTE, &token) < 0)
2954                 goto fail;
2955 
2956  concat:
2957         event->print_fmt.format = token;
2958         event->print_fmt.args = NULL;
2959 
2960         /* ok to have no arg */
2961         type = read_token_item(&token);
2962 
2963         if (type == EVENT_NONE)
2964                 return 0;
2965 
2966         /* Handle concatenation of print lines */
2967         if (type == EVENT_DQUOTE) {
2968                 char *cat;
2969 
2970                 if (asprintf(&cat, "%s%s", event->print_fmt.format, token) < 0)
2971                         goto fail;
2972                 free_token(token);
2973                 free_token(event->print_fmt.format);
2974                 event->print_fmt.format = NULL;
2975                 token = cat;
2976                 goto concat;
2977         }
2978                              
2979         if (test_type_token(type, token, EVENT_DELIM, ","))
2980                 goto fail;
2981 
2982         free_token(token);
2983 
2984         ret = event_read_print_args(event, &event->print_fmt.args);
2985         if (ret < 0)
2986                 return -1;
2987 
2988         return ret;
2989 
2990  fail:
2991         free_token(token);
2992         return -1;
2993 }
2994 
2995 /**
2996  * pevent_find_common_field - return a common field by event
2997  * @event: handle for the event
2998  * @name: the name of the common field to return
2999  *
3000  * Returns a common field from the event by the given @name.
3001  * This only searchs the common fields and not all field.
3002  */
3003 struct format_field *
3004 pevent_find_common_field(struct event_format *event, const char *name)
3005 {
3006         struct format_field *format;
3007 
3008         for (format = event->format.common_fields;
3009              format; format = format->next) {
3010                 if (strcmp(format->name, name) == 0)
3011                         break;
3012         }
3013 
3014         return format;
3015 }
3016 
3017 /**
3018  * pevent_find_field - find a non-common field
3019  * @event: handle for the event
3020  * @name: the name of the non-common field
3021  *
3022  * Returns a non-common field by the given @name.
3023  * This does not search common fields.
3024  */
3025 struct format_field *
3026 pevent_find_field(struct event_format *event, const char *name)
3027 {
3028         struct format_field *format;
3029 
3030         for (format = event->format.fields;
3031              format; format = format->next) {
3032                 if (strcmp(format->name, name) == 0)
3033                         break;
3034         }
3035 
3036         return format;
3037 }
3038 
3039 /**
3040  * pevent_find_any_field - find any field by name
3041  * @event: handle for the event
3042  * @name: the name of the field
3043  *
3044  * Returns a field by the given @name.
3045  * This searchs the common field names first, then
3046  * the non-common ones if a common one was not found.
3047  */
3048 struct format_field *
3049 pevent_find_any_field(struct event_format *event, const char *name)
3050 {
3051         struct format_field *format;
3052 
3053         format = pevent_find_common_field(event, name);
3054         if (format)
3055                 return format;
3056         return pevent_find_field(event, name);
3057 }
3058 
3059 /**
3060  * pevent_read_number - read a number from data
3061  * @pevent: handle for the pevent
3062  * @ptr: the raw data
3063  * @size: the size of the data that holds the number
3064  *
3065  * Returns the number (converted to host) from the
3066  * raw data.
3067  */
3068 unsigned long long pevent_read_number(struct pevent *pevent,
3069                                       const void *ptr, int size)
3070 {
3071         switch (size) {
3072         case 1:
3073                 return *(unsigned char *)ptr;
3074         case 2:
3075                 return data2host2(pevent, ptr);
3076         case 4:
3077                 return data2host4(pevent, ptr);
3078         case 8:
3079                 return data2host8(pevent, ptr);
3080         default:
3081                 /* BUG! */
3082                 return 0;
3083         }
3084 }
3085 
3086 /**
3087  * pevent_read_number_field - read a number from data
3088  * @field: a handle to the field
3089  * @data: the raw data to read
3090  * @value: the value to place the number in
3091  *
3092  * Reads raw data according to a field offset and size,
3093  * and translates it into @value.
3094  *
3095  * Returns 0 on success, -1 otherwise.
3096  */
3097 int pevent_read_number_field(struct format_field *field, const void *data,
3098                              unsigned long long *value)
3099 {
3100         if (!field)
3101                 return -1;
3102         switch (field->size) {
3103         case 1:
3104         case 2:
3105         case 4:
3106         case 8:
3107                 *value = pevent_read_number(field->event->pevent,
3108                                             data + field->offset, field->size);
3109                 return 0;
3110         default:
3111                 return -1;
3112         }
3113 }
3114 
3115 static int get_common_info(struct pevent *pevent,
3116                            const char *type, int *offset, int *size)
3117 {
3118         struct event_format *event;
3119         struct format_field *field;
3120 
3121         /*
3122          * All events should have the same common elements.
3123          * Pick any event to find where the type is;
3124          */
3125         if (!pevent->events) {
3126                 do_warning("no event_list!");
3127                 return -1;
3128         }
3129 
3130         event = pevent->events[0];
3131         field = pevent_find_common_field(event, type);
3132         if (!field)
3133                 return -1;
3134 
3135         *offset = field->offset;
3136         *size = field->size;
3137 
3138         return 0;
3139 }
3140 
3141 static int __parse_common(struct pevent *pevent, void *data,
3142                           int *size, int *offset, const char *name)
3143 {
3144         int ret;
3145 
3146         if (!*size) {
3147                 ret = get_common_info(pevent, name, offset, size);
3148                 if (ret < 0)
3149                         return ret;
3150         }
3151         return pevent_read_number(pevent, data + *offset, *size);
3152 }
3153 
3154 static int trace_parse_common_type(struct pevent *pevent, void *data)
3155 {
3156         return __parse_common(pevent, data,
3157                               &pevent->type_size, &pevent->type_offset,
3158                               "common_type");
3159 }
3160 
3161 static int parse_common_pid(struct pevent *pevent, void *data)
3162 {
3163         return __parse_common(pevent, data,
3164                               &pevent->pid_size, &pevent->pid_offset,
3165                               "common_pid");
3166 }
3167 
3168 static int parse_common_pc(struct pevent *pevent, void *data)
3169 {
3170         return __parse_common(pevent, data,
3171                               &pevent->pc_size, &pevent->pc_offset,
3172                               "common_preempt_count");
3173 }
3174 
3175 static int parse_common_flags(struct pevent *pevent, void *data)
3176 {
3177         return __parse_common(pevent, data,
3178                               &pevent->flags_size, &pevent->flags_offset,
3179                               "common_flags");
3180 }
3181 
3182 static int parse_common_lock_depth(struct pevent *pevent, void *data)
3183 {
3184         return __parse_common(pevent, data,
3185                               &pevent->ld_size, &pevent->ld_offset,
3186                               "common_lock_depth");
3187 }
3188 
3189 static int parse_common_migrate_disable(struct pevent *pevent, void *data)
3190 {
3191         return __parse_common(pevent, data,
3192                               &pevent->ld_size, &pevent->ld_offset,
3193                               "common_migrate_disable");
3194 }
3195 
3196 static int events_id_cmp(const void *a, const void *b);
3197 
3198 /**
3199  * pevent_find_event - find an event by given id
3200  * @pevent: a handle to the pevent
3201  * @id: the id of the event
3202  *
3203  * Returns an event that has a given @id.
3204  */
3205 struct event_format *pevent_find_event(struct pevent *pevent, int id)
3206 {
3207         struct event_format **eventptr;
3208         struct event_format key;
3209         struct event_format *pkey = &key;
3210 
3211         /* Check cache first */
3212         if (pevent->last_event && pevent->last_event->id == id)
3213                 return pevent->last_event;
3214 
3215         key.id = id;
3216 
3217         eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
3218                            sizeof(*pevent->events), events_id_cmp);
3219 
3220         if (eventptr) {
3221                 pevent->last_event = *eventptr;
3222                 return *eventptr;
3223         }
3224 
3225         return NULL;
3226 }
3227 
3228 /**
3229  * pevent_find_event_by_name - find an event by given name
3230  * @pevent: a handle to the pevent
3231  * @sys: the system name to search for
3232  * @name: the name of the event to search for
3233  *
3234  * This returns an event with a given @name and under the system
3235  * @sys. If @sys is NULL the first event with @name is returned.
3236  */
3237 struct event_format *
3238 pevent_find_event_by_name(struct pevent *pevent,
3239                           const char *sys, const char *name)
3240 {
3241         struct event_format *event;
3242         int i;
3243 
3244         if (pevent->last_event &&
3245             strcmp(pevent->last_event->name, name) == 0 &&
3246             (!sys || strcmp(pevent->last_event->system, sys) == 0))
3247                 return pevent->last_event;
3248 
3249         for (i = 0; i < pevent->nr_events; i++) {
3250                 event = pevent->events[i];
3251                 if (strcmp(event->name, name) == 0) {
3252                         if (!sys)
3253                                 break;
3254                         if (strcmp(event->system, sys) == 0)
3255                                 break;
3256                 }
3257         }
3258         if (i == pevent->nr_events)
3259                 event = NULL;
3260 
3261         pevent->last_event = event;
3262         return event;
3263 }
3264 
3265 static unsigned long long
3266 eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
3267 {
3268         struct pevent *pevent = event->pevent;
3269         unsigned long long val = 0;
3270         unsigned long long left, right;
3271         struct print_arg *typearg = NULL;
3272         struct print_arg *larg;
3273         unsigned long offset;
3274         unsigned int field_size;
3275 
3276         switch (arg->type) {
3277         case PRINT_NULL:
3278                 /* ?? */
3279                 return 0;
3280         case PRINT_ATOM:
3281                 return strtoull(arg->atom.atom, NULL, 0);
3282         case PRINT_FIELD:
3283                 if (!arg->field.field) {
3284                         arg->field.field = pevent_find_any_field(event, arg->field.name);
3285                         if (!arg->field.field)
3286                                 goto out_warning_field;
3287                         
3288                 }
3289                 /* must be a number */
3290                 val = pevent_read_number(pevent, data + arg->field.field->offset,
3291                                 arg->field.field->size);
3292                 break;
3293         case PRINT_FLAGS:
3294         case PRINT_SYMBOL:
3295         case PRINT_HEX:
3296                 break;
3297         case PRINT_TYPE:
3298                 val = eval_num_arg(data, size, event, arg->typecast.item);
3299                 return eval_type(val, arg, 0);
3300         case PRINT_STRING:
3301         case PRINT_BSTRING:
3302                 return 0;
3303         case PRINT_FUNC: {
3304                 struct trace_seq s;
3305                 trace_seq_init(&s);
3306                 val = process_defined_func(&s, data, size, event, arg);
3307                 trace_seq_destroy(&s);
3308                 return val;
3309         }
3310         case PRINT_OP:
3311                 if (strcmp(arg->op.op, "[") == 0) {
3312                         /*
3313                          * Arrays are special, since we don't want
3314                          * to read the arg as is.
3315                          */
3316                         right = eval_num_arg(data, size, event, arg->op.right);
3317 
3318                         /* handle typecasts */
3319                         larg = arg->op.left;
3320                         while (larg->type == PRINT_TYPE) {
3321                                 if (!typearg)
3322                                         typearg = larg;
3323                                 larg = larg->typecast.item;
3324                         }
3325 
3326                         /* Default to long size */
3327                         field_size = pevent->long_size;
3328 
3329                         switch (larg->type) {
3330                         case PRINT_DYNAMIC_ARRAY:
3331                                 offset = pevent_read_number(pevent,
3332                                                    data + larg->dynarray.field->offset,
3333                                                    larg->dynarray.field->size);
3334                                 if (larg->dynarray.field->elementsize)
3335                                         field_size = larg->dynarray.field->elementsize;
3336                                 /*
3337                                  * The actual length of the dynamic array is stored
3338                                  * in the top half of the field, and the offset
3339                                  * is in the bottom half of the 32 bit field.
3340                                  */
3341                                 offset &= 0xffff;
3342                                 offset += right;
3343                                 break;
3344                         case PRINT_FIELD:
3345                                 if (!larg->field.field) {
3346                                         larg->field.field =
3347                                                 pevent_find_any_field(event, larg->field.name);
3348                                         if (!larg->field.field) {
3349                                                 arg = larg;
3350                                                 goto out_warning_field;
3351                                         }
3352                                 }
3353                                 field_size = larg->field.field->elementsize;
3354                                 offset = larg->field.field->offset +
3355                                         right * larg->field.field->elementsize;
3356                                 break;
3357                         default:
3358                                 goto default_op; /* oops, all bets off */
3359                         }
3360                         val = pevent_read_number(pevent,
3361                                                  data + offset, field_size);
3362                         if (typearg)
3363                                 val = eval_type(val, typearg, 1);
3364                         break;
3365                 } else if (strcmp(arg->op.op, "?") == 0) {
3366                         left = eval_num_arg(data, size, event, arg->op.left);
3367                         arg = arg->op.right;
3368                         if (left)
3369                                 val = eval_num_arg(data, size, event, arg->op.left);
3370                         else
3371                                 val = eval_num_arg(data, size, event, arg->op.right);
3372                         break;
3373                 }
3374  default_op:
3375                 left = eval_num_arg(data, size, event, arg->op.left);
3376                 right = eval_num_arg(data, size, event, arg->op.right);
3377                 switch (arg->op.op[0]) {
3378                 case '!':
3379                         switch (arg->op.op[1]) {
3380                         case 0:
3381                                 val = !right;
3382                                 break;
3383                         case '=':
3384                                 val = left != right;
3385                                 break;
3386                         default:
3387                                 goto out_warning_op;
3388                         }
3389                         break;
3390                 case '~':
3391                         val = ~right;
3392                         break;
3393                 case '|':
3394                         if (arg->op.op[1])
3395                                 val = left || right;
3396                         else
3397                                 val = left | right;
3398                         break;
3399                 case '&':
3400                         if (arg->op.op[1])
3401                                 val = left && right;
3402                         else
3403                                 val = left & right;
3404                         break;
3405                 case '<':
3406                         switch (arg->op.op[1]) {
3407                         case 0:
3408                                 val = left < right;
3409                                 break;
3410                         case '<':
3411                                 val = left << right;
3412                                 break;
3413                         case '=':
3414                                 val = left <= right;
3415                                 break;
3416                         default:
3417                                 goto out_warning_op;
3418                         }
3419                         break;
3420                 case '>':
3421                         switch (arg->op.op[1]) {
3422                         case 0:
3423                                 val = left > right;
3424                                 break;
3425                         case '>':
3426                                 val = left >> right;
3427                                 break;
3428                         case '=':
3429                                 val = left >= right;
3430                                 break;
3431                         default:
3432                                 goto out_warning_op;
3433                         }
3434                         break;
3435                 case '=':
3436                         if (arg->op.op[1] != '=')
3437                                 goto out_warning_op;
3438 
3439                         val = left == right;
3440                         break;
3441                 case '-':
3442                         val = left - right;
3443                         break;
3444                 case '+':
3445                         val = left + right;
3446                         break;
3447                 case '/':
3448                         val = left / right;
3449                         break;
3450                 case '*':
3451                         val = left * right;
3452                         break;
3453                 default:
3454                         goto out_warning_op;
3455                 }
3456                 break;
3457         case PRINT_DYNAMIC_ARRAY:
3458                 /* Without [], we pass the address to the dynamic data */
3459                 offset = pevent_read_number(pevent,
3460                                             data + arg->dynarray.field->offset,
3461                                             arg->dynarray.field->size);
3462                 /*
3463                  * The actual length of the dynamic array is stored
3464                  * in the top half of the field, and the offset
3465                  * is in the bottom half of the 32 bit field.
3466                  */
3467                 offset &= 0xffff;
3468                 val = (unsigned long long)((unsigned long)data + offset);
3469                 break;
3470         default: /* not sure what to do there */
3471                 return 0;
3472         }
3473         return val;
3474 
3475 out_warning_op:
3476         do_warning("%s: unknown op '%s'", __func__, arg->op.op);
3477         return 0;
3478 
3479 out_warning_field:
3480         do_warning("%s: field %s not found", __func__, arg->field.name);
3481         return 0;
3482 }
3483 
3484 struct flag {
3485         const char *name;
3486         unsigned long long value;
3487 };
3488 
3489 static const struct flag flags[] = {
3490         { "HI_SOFTIRQ", 0 },
3491         { "TIMER_SOFTIRQ", 1 },
3492         { "NET_TX_SOFTIRQ", 2 },
3493         { "NET_RX_SOFTIRQ", 3 },
3494         { "BLOCK_SOFTIRQ", 4 },
3495         { "BLOCK_IOPOLL_SOFTIRQ", 5 },
3496         { "TASKLET_SOFTIRQ", 6 },
3497         { "SCHED_SOFTIRQ", 7 },
3498         { "HRTIMER_SOFTIRQ", 8 },
3499         { "RCU_SOFTIRQ", 9 },
3500 
3501         { "HRTIMER_NORESTART", 0 },
3502         { "HRTIMER_RESTART", 1 },
3503 };
3504 
3505 static unsigned long long eval_flag(const char *flag)
3506 {
3507         int i;
3508 
3509         /*
3510          * Some flags in the format files do not get converted.
3511          * If the flag is not numeric, see if it is something that
3512          * we already know about.
3513          */
3514         if (isdigit(flag[0]))
3515                 return strtoull(flag, NULL, 0);
3516 
3517         for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
3518                 if (strcmp(flags[i].name, flag) == 0)
3519                         return flags[i].value;
3520 
3521         return 0;
3522 }
3523 
3524 static void print_str_to_seq(struct trace_seq *s, const char *format,
3525                              int len_arg, const char *str)
3526 {
3527         if (len_arg >= 0)
3528                 trace_seq_printf(s, format, len_arg, str);
3529         else
3530                 trace_seq_printf(s, format, str);
3531 }
3532 
3533 static void print_str_arg(struct trace_seq *s, void *data, int size,
3534                           struct event_format *event, const char *format,
3535                           int len_arg, struct print_arg *arg)
3536 {
3537         struct pevent *pevent = event->pevent;
3538         struct print_flag_sym *flag;
3539         struct format_field *field;
3540         struct printk_map *printk;
3541         unsigned long long val, fval;
3542         unsigned long addr;
3543         char *str;
3544         unsigned char *hex;
3545         int print;
3546         int i, len;
3547 
3548         switch (arg->type) {
3549         case PRINT_NULL:
3550                 /* ?? */
3551                 return;
3552         case PRINT_ATOM:
3553                 print_str_to_seq(s, format, len_arg, arg->atom.atom);
3554                 return;
3555         case PRINT_FIELD:
3556                 field = arg->field.field;
3557                 if (!field) {
3558                         field = pevent_find_any_field(event, arg->field.name);
3559                         if (!field) {
3560                                 str = arg->field.name;
3561                                 goto out_warning_field;
3562                         }
3563                         arg->field.field = field;
3564                 }
3565                 /* Zero sized fields, mean the rest of the data */
3566                 len = field->size ? : size - field->offset;
3567 
3568                 /*
3569                  * Some events pass in pointers. If this is not an array
3570                  * and the size is the same as long_size, assume that it
3571                  * is a pointer.
3572                  */
3573                 if (!(field->flags & FIELD_IS_ARRAY) &&
3574                     field->size == pevent->long_size) {
3575                         addr = *(unsigned long *)(data + field->offset);
3576                         /* Check if it matches a print format */
3577                         printk = find_printk(pevent, addr);
3578                         if (printk)
3579                                 trace_seq_puts(s, printk->printk);
3580                         else
3581                                 trace_seq_printf(s, "%lx", addr);
3582                         break;
3583                 }
3584                 str = malloc(len + 1);
3585                 if (!str) {
3586                         do_warning("%s: not enough memory!", __func__);
3587                         return;
3588                 }
3589                 memcpy(str, data + field->offset, len);
3590                 str[len] = 0;
3591                 print_str_to_seq(s, format, len_arg, str);
3592                 free(str);
3593                 break;
3594         case PRINT_FLAGS:
3595                 val = eval_num_arg(data, size, event, arg->flags.field);
3596                 print = 0;
3597                 for (flag = arg->flags.flags; flag; flag = flag->next) {
3598                         fval = eval_flag(flag->value);
3599                         if (!val && !fval) {
3600                                 print_str_to_seq(s, format, len_arg, flag->str);
3601                                 break;
3602                         }
3603                         if (fval && (val & fval) == fval) {
3604                                 if (print && arg->flags.delim)
3605                                         trace_seq_puts(s, arg->flags.delim);
3606                                 print_str_to_seq(s, format, len_arg, flag->str);
3607                                 print = 1;
3608                                 val &= ~fval;
3609                         }
3610                 }
3611                 break;
3612         case PRINT_SYMBOL:
3613                 val = eval_num_arg(data, size, event, arg->symbol.field);
3614                 for (flag = arg->symbol.symbols; flag; flag = flag->next) {
3615                         fval = eval_flag(flag->value);
3616                         if (val == fval) {
3617                                 print_str_to_seq(s, format, len_arg, flag->str);
3618                                 break;
3619                         }
3620                 }
3621                 break;
3622         case PRINT_HEX:
3623                 if (arg->hex.field->type == PRINT_DYNAMIC_ARRAY) {
3624                         unsigned long offset;
3625                         offset = pevent_read_number(pevent,
3626                                 data + arg->hex.field->dynarray.field->offset,
3627                                 arg->hex.field->dynarray.field->size);
3628                         hex = data + (offset & 0xffff);
3629                 } else {
3630                         field = arg->hex.field->field.field;
3631                         if (!field) {
3632                                 str = arg->hex.field->field.name;
3633                                 field = pevent_find_any_field(event, str);
3634                                 if (!field)
3635                                         goto out_warning_field;
3636                                 arg->hex.field->field.field = field;
3637                         }
3638                         hex = data + field->offset;
3639                 }
3640                 len = eval_num_arg(data, size, event, arg->hex.size);
3641                 for (i = 0; i < len; i++) {
3642                         if (i)
3643                                 trace_seq_putc(s, ' ');
3644                         trace_seq_printf(s, "%02x", hex[i]);
3645                 }
3646                 break;
3647 
3648         case PRINT_TYPE:
3649                 break;
3650         case PRINT_STRING: {
3651                 int str_offset;
3652 
3653                 if (arg->string.offset == -1) {
3654                         struct format_field *f;
3655 
3656                         f = pevent_find_any_field(event, arg->string.string);
3657                         arg->string.offset = f->offset;
3658                 }
3659                 str_offset = data2host4(pevent, data + arg->string.offset);
3660                 str_offset &= 0xffff;
3661                 print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
3662                 break;
3663         }
3664         case PRINT_BSTRING:
3665                 print_str_to_seq(s, format, len_arg, arg->string.string);
3666                 break;
3667         case PRINT_OP:
3668                 /*
3669                  * The only op for string should be ? :
3670                  */
3671                 if (arg->op.op[0] != '?')
3672                         return;
3673                 val = eval_num_arg(data, size, event, arg->op.left);
3674                 if (val)
3675                         print_str_arg(s, data, size, event,
3676                                       format, len_arg, arg->op.right->op.left);
3677                 else
3678                         print_str_arg(s, data, size, event,
3679                                       format, len_arg, arg->op.right->op.right);
3680                 break;
3681         case PRINT_FUNC:
3682                 process_defined_func(s, data, size, event, arg);
3683                 break;
3684         default:
3685                 /* well... */
3686                 break;
3687         }
3688 
3689         return;
3690 
3691 out_warning_field:
3692         do_warning("%s: field %s not found", __func__, arg->field.name);
3693 }
3694 
3695 static unsigned long long
3696 process_defined_func(struct trace_seq *s, void *data, int size,
3697                      struct event_format *event, struct print_arg *arg)
3698 {
3699         struct pevent_function_handler *func_handle = arg->func.func;
3700         struct pevent_func_params *param;
3701         unsigned long long *args;
3702         unsigned long long ret;
3703         struct print_arg *farg;
3704         struct trace_seq str;
3705         struct save_str {
3706                 struct save_str *next;
3707                 char *str;
3708         } *strings = NULL, *string;
3709         int i;
3710 
3711         if (!func_handle->nr_args) {
3712                 ret = (*func_handle->func)(s, NULL);
3713                 goto out;
3714         }
3715 
3716         farg = arg->func.args;
3717         param = func_handle->params;
3718 
3719         ret = ULLONG_MAX;
3720         args = malloc(sizeof(*args) * func_handle->nr_args);
3721         if (!args)
3722                 goto out;
3723 
3724         for (i = 0; i < func_handle->nr_args; i++) {
3725                 switch (param->type) {
3726                 case PEVENT_FUNC_ARG_INT:
3727                 case PEVENT_FUNC_ARG_LONG:
3728                 case PEVENT_FUNC_ARG_PTR:
3729                         args[i] = eval_num_arg(data, size, event, farg);
3730                         break;
3731                 case PEVENT_FUNC_ARG_STRING:
3732                         trace_seq_init(&str);
3733                         print_str_arg(&str, data, size, event, "%s", -1, farg);
3734                         trace_seq_terminate(&str);
3735                         string = malloc(sizeof(*string));
3736                         if (!string) {
3737                                 do_warning("%s(%d): malloc str", __func__, __LINE__);
3738                                 goto out_free;
3739                         }
3740                         string->next = strings;
3741                         string->str = strdup(str.buffer);
3742                         if (!string->str) {
3743                                 free(string);
3744                                 do_warning("%s(%d): malloc str", __func__, __LINE__);
3745                                 goto out_free;
3746                         }
3747                         args[i] = (uintptr_t)string->str;
3748                         strings = string;
3749                         trace_seq_destroy(&str);
3750                         break;
3751                 default:
3752                         /*
3753                          * Something went totally wrong, this is not
3754                          * an input error, something in this code broke.
3755                          */
3756                         do_warning("Unexpected end of arguments\n");
3757                         goto out_free;
3758                 }
3759                 farg = farg->next;
3760                 param = param->next;
3761         }
3762 
3763         ret = (*func_handle->func)(s, args);
3764 out_free:
3765         free(args);
3766         while (strings) {
3767                 string = strings;
3768                 strings = string->next;
3769                 free(string->str);
3770                 free(string);
3771         }
3772 
3773  out:
3774         /* TBD : handle return type here */
3775         return ret;
3776 }
3777 
3778 static void free_args(struct print_arg *args)
3779 {
3780         struct print_arg *next;
3781 
3782         while (args) {
3783                 next = args->next;
3784 
3785                 free_arg(args);
3786                 args = next;
3787         }
3788 }
3789 
3790 static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
3791 {
3792         struct pevent *pevent = event->pevent;
3793         struct format_field *field, *ip_field;
3794         struct print_arg *args, *arg, **next;
3795         unsigned long long ip, val;
3796         char *ptr;
3797         void *bptr;
3798         int vsize;
3799 
3800         field = pevent->bprint_buf_field;
3801         ip_field = pevent->bprint_ip_field;
3802 
3803         if (!field) {
3804                 field = pevent_find_field(event, "buf");
3805                 if (!field) {
3806                         do_warning("can't find buffer field for binary printk");
3807                         return NULL;
3808                 }
3809                 ip_field = pevent_find_field(event, "ip");
3810                 if (!ip_field) {
3811                         do_warning("can't find ip field for binary printk");
3812                         return NULL;
3813                 }
3814                 pevent->bprint_buf_field = field;
3815                 pevent->bprint_ip_field = ip_field;
3816         }
3817 
3818         ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
3819 
3820         /*
3821          * The first arg is the IP pointer.
3822          */
3823         args = alloc_arg();
3824         if (!args) {
3825                 do_warning("%s(%d): not enough memory!", __func__, __LINE__);
3826                 return NULL;
3827         }
3828         arg = args;
3829         arg->next = NULL;
3830         next = &arg->next;
3831 
3832         arg->type = PRINT_ATOM;
3833                 
3834         if (asprintf(&arg->atom.atom, "%lld", ip) < 0)
3835                 goto out_free;
3836 
3837         /* skip the first "%pf: " */
3838         for (ptr = fmt + 5, bptr = data + field->offset;
3839              bptr < data + size && *ptr; ptr++) {
3840                 int ls = 0;
3841 
3842                 if (*ptr == '%') {
3843  process_again:
3844                         ptr++;
3845                         switch (*ptr) {
3846                         case '%':
3847                                 break;
3848                         case 'l':
3849                                 ls++;
3850                                 goto process_again;
3851                         case 'L':
3852                                 ls = 2;
3853                                 goto process_again;
3854                         case '' ... '9':
3855                                 goto process_again;
3856                         case '.':
3857                                 goto process_again;
3858                         case 'p':
3859                                 ls = 1;
3860                                 /* fall through */
3861                         case 'd':
3862                         case 'u':
3863                         case 'x':
3864                         case 'i':
3865                                 switch (ls) {
3866                                 case 0:
3867                                         vsize = 4;
3868                                         break;
3869                                 case 1:
3870                                         vsize = pevent->long_size;
3871                                         break;
3872                                 case 2:
3873                                         vsize = 8;
3874                                         break;
3875                                 default:
3876                                         vsize = ls; /* ? */
3877                                         break;
3878                                 }
3879                         /* fall through */
3880                         case '*':
3881                                 if (*ptr == '*')
3882                                         vsize = 4;
3883 
3884                                 /* the pointers are always 4 bytes aligned */
3885                                 bptr = (void *)(((unsigned long)bptr + 3) &
3886                                                 ~3);
3887                                 val = pevent_read_number(pevent, bptr, vsize);
3888                                 bptr += vsize;
3889                                 arg = alloc_arg();
3890                                 if (!arg) {
3891                                         do_warning("%s(%d): not enough memory!",
3892                                                    __func__, __LINE__);
3893                                         goto out_free;
3894                                 }
3895                                 arg->next = NULL;
3896                                 arg->type = PRINT_ATOM;
3897                                 if (asprintf(&arg->atom.atom, "%lld", val) < 0) {
3898                                         free(arg);
3899                                         goto out_free;
3900                                 }
3901                                 *next = arg;
3902                                 next = &arg->next;
3903                                 /*
3904                                  * The '*' case means that an arg is used as the length.
3905                                  * We need to continue to figure out for what.
3906                                  */
3907                                 if (*ptr == '*')
3908                                         goto process_again;
3909 
3910                                 break;
3911                         case 's':
3912                                 arg = alloc_arg();
3913                                 if (!arg) {
3914                                         do_warning("%s(%d): not enough memory!",
3915                                                    __func__, __LINE__);
3916                                         goto out_free;
3917                                 }
3918                                 arg->next = NULL;
3919                                 arg->type = PRINT_BSTRING;
3920                                 arg->string.string = strdup(bptr);
3921                                 if (!arg->string.string)
3922                                         goto out_free;
3923                                 bptr += strlen(bptr) + 1;
3924                                 *next = arg;
3925                                 next = &arg->next;
3926                         default:
3927                                 break;
3928                         }
3929                 }
3930         }
3931 
3932         return args;
3933 
3934 out_free:
3935         free_args(args);
3936         return NULL;
3937 }
3938 
3939 static char *
3940 get_bprint_format(void *data, int size __maybe_unused,
3941                   struct event_format *event)
3942 {
3943         struct pevent *pevent = event->pevent;
3944         unsigned long long addr;
3945         struct format_field *field;
3946         struct printk_map *printk;
3947         char *format;
3948 
3949         field = pevent->bprint_fmt_field;
3950 
3951         if (!field) {
3952                 field = pevent_find_field(event, "fmt");
3953                 if (!field) {
3954                         do_warning("can't find format field for binary printk");
3955                         return NULL;
3956                 }
3957                 pevent->bprint_fmt_field = field;
3958         }
3959 
3960         addr = pevent_read_number(pevent, data + field->offset, field->size);
3961 
3962         printk = find_printk(pevent, addr);
3963         if (!printk) {
3964                 if (asprintf(&format, "%%pf: (NO FORMAT FOUND at %llx)\n", addr) < 0)
3965                         return NULL;
3966                 return format;
3967         }
3968 
3969         if (asprintf(&format, "%s: %s", "%pf", printk->printk) < 0)
3970                 return NULL;
3971 
3972         return format;
3973 }
3974 
3975 static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
3976                           struct event_format *event, struct print_arg *arg)
3977 {
3978         unsigned char *buf;
3979         const char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
3980 
3981         if (arg->type == PRINT_FUNC) {
3982                 process_defined_func(s, data, size, event, arg);
3983                 return;
3984         }
3985 
3986         if (arg->type != PRINT_FIELD) {
3987                 trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
3988                                  arg->type);
3989                 return;
3990         }
3991 
3992         if (mac == 'm')
3993                 fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
3994         if (!arg->field.field) {
3995                 arg->field.field =
3996                         pevent_find_any_field(event, arg->field.name);
3997                 if (!arg->field.field) {
3998                         do_warning("%s: field %s not found",
3999                                    __func__, arg->field.name);
4000                         return;
4001                 }
4002         }
4003         if (arg->field.field->size != 6) {
4004                 trace_seq_printf(s, "INVALIDMAC");
4005                 return;
4006         }
4007         buf = data + arg->field.field->offset;
4008         trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
4009 }
4010 
4011 static int is_printable_array(char *p, unsigned int len)
4012 {
4013         unsigned int i;
4014 
4015         for (i = 0; i < len && p[i]; i++)
4016                 if (!isprint(p[i]) && !isspace(p[i]))
4017                     return 0;
4018         return 1;
4019 }
4020 
4021 static void print_event_fields(struct trace_seq *s, void *data,
4022                                int size __maybe_unused,
4023                                struct event_format *event)
4024 {
4025         struct format_field *field;
4026         unsigned long long val;
4027         unsigned int offset, len, i;
4028 
4029         field = event->format.fields;
4030         while (field) {
4031                 trace_seq_printf(s, " %s=", field->name);
4032                 if (field->flags & FIELD_IS_ARRAY) {
4033                         offset = field->offset;
4034                         len = field->size;
4035                         if (field->flags & FIELD_IS_DYNAMIC) {
4036                                 val = pevent_read_number(event->pevent, data + offset, len);
4037                                 offset = val;
4038                                 len = offset >> 16;
4039                                 offset &= 0xffff;
4040                         }
4041                         if (field->flags & FIELD_IS_STRING &&
4042                             is_printable_array(data + offset, len)) {
4043                                 trace_seq_printf(s, "%s", (char *)data + offset);
4044                         } else {
4045                                 trace_seq_puts(s, "ARRAY[");
4046                                 for (i = 0; i < len; i++) {
4047                                         if (i)
4048                                                 trace_seq_puts(s, ", ");
4049                                         trace_seq_printf(s, "%02x",
4050                                                          *((unsigned char *)data + offset + i));
4051                                 }
4052                                 trace_seq_putc(s, ']');
4053                                 field->flags &= ~FIELD_IS_STRING;
4054                         }
4055                 } else {
4056                         val = pevent_read_number(event->pevent, data + field->offset,
4057                                                  field->size);
4058                         if (field->flags & FIELD_IS_POINTER) {
4059                                 trace_seq_printf(s, "0x%llx", val);
4060                         } else if (field->flags & FIELD_IS_SIGNED) {
4061                                 switch (field->size) {
4062                                 case 4:
4063                                         /*
4064                                          * If field is long then print it in hex.
4065                                          * A long usually stores pointers.
4066                                          */
4067                                         if (field->flags & FIELD_IS_LONG)
4068                                                 trace_seq_printf(s, "0x%x", (int)val);
4069                                         else
4070                                                 trace_seq_printf(s, "%d", (int)val);
4071                                         break;
4072                                 case 2:
4073                                         trace_seq_printf(s, "%2d", (short)val);
4074                                         break;
4075                                 case 1:
4076                                         trace_seq_printf(s, "%1d", (char)val);
4077                                         break;
4078                                 default:
4079                                         trace_seq_printf(s, "%lld", val);
4080                                 }
4081                         } else {
4082                                 if (field->flags & FIELD_IS_LONG)
4083                                         trace_seq_printf(s, "0x%llx", val);
4084                                 else
4085                                         trace_seq_printf(s, "%llu", val);
4086                         }
4087                 }
4088                 field = field->next;
4089         }
4090 }
4091 
4092 static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
4093 {
4094         struct pevent *pevent = event->pevent;
4095         struct print_fmt *print_fmt = &event->print_fmt;
4096         struct print_arg *arg = print_fmt->args;
4097         struct print_arg *args = NULL;
4098         const char *ptr = print_fmt->format;
4099         unsigned long long val;
4100         struct func_map *func;
4101         const char *saveptr;
4102         char *bprint_fmt = NULL;
4103         char format[32];
4104         int show_func;
4105         int len_as_arg;
4106         int len_arg;
4107         int len;
4108         int ls;
4109 
4110         if (event->flags & EVENT_FL_FAILED) {
4111                 trace_seq_printf(s, "[FAILED TO PARSE]");
4112                 print_event_fields(s, data, size, event);
4113                 return;
4114         }
4115 
4116         if (event->flags & EVENT_FL_ISBPRINT) {
4117                 bprint_fmt = get_bprint_format(data, size, event);
4118                 args = make_bprint_args(bprint_fmt, data, size, event);
4119                 arg = args;
4120                 ptr = bprint_fmt;
4121         }
4122 
4123         for (; *ptr; ptr++) {
4124                 ls = 0;
4125                 if (*ptr == '\\') {
4126                         ptr++;
4127                         switch (*ptr) {
4128                         case 'n':
4129                                 trace_seq_putc(s, '\n');
4130                                 break;
4131                         case 't':
4132                                 trace_seq_putc(s, '\t');
4133                                 break;
4134                         case 'r':
4135                                 trace_seq_putc(s, '\r');
4136                                 break;
4137                         case '\\':
4138                                 trace_seq_putc(s, '\\');
4139                                 break;
4140                         default:
4141                                 trace_seq_putc(s, *ptr);
4142                                 break;
4143                         }
4144 
4145                 } else if (*ptr == '%') {
4146                         saveptr = ptr;
4147                         show_func = 0;
4148                         len_as_arg = 0;
4149  cont_process:
4150                         ptr++;
4151                         switch (*ptr) {
4152                         case '%':
4153                                 trace_seq_putc(s, '%');
4154                                 break;
4155                         case '#':
4156                                 /* FIXME: need to handle properly */
4157                                 goto cont_process;
4158                         case 'h':
4159                                 ls--;
4160                                 goto cont_process;
4161                         case 'l':
4162                                 ls++;
4163                                 goto cont_process;
4164                         case 'L':
4165                                 ls = 2;
4166                                 goto cont_process;
4167                         case '*':
4168                                 /* The argument is the length. */
4169                                 if (!arg) {
4170                                         do_warning("no argument match");
4171                                         event->flags |= EVENT_FL_FAILED;
4172                                         goto out_failed;
4173                                 }
4174                                 len_arg = eval_num_arg(data, size, event, arg);
4175                                 len_as_arg = 1;
4176                                 arg = arg->next;
4177                                 goto cont_process;
4178                         case '.':
4179                         case 'z':
4180                         case 'Z':
4181                         case '' ... '9':
4182                                 goto cont_process;
4183                         case 'p':
4184                                 if (pevent->long_size == 4)
4185                                         ls = 1;
4186                                 else
4187                                         ls = 2;
4188 
4189                                 if (*(ptr+1) == 'F' ||
4190                                     *(ptr+1) == 'f') {
4191                                         ptr++;
4192                                         show_func = *ptr;
4193                                 } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
4194                                         print_mac_arg(s, *(ptr+1), data, size, event, arg);
4195                                         ptr++;
4196                                         arg = arg->next;
4197                                         break;
4198                                 }
4199 
4200                                 /* fall through */
4201                         case 'd':
4202                         case 'i':
4203                         case 'x':
4204                         case 'X':
4205                         case 'u':
4206                                 if (!arg) {
4207                                         do_warning("no argument match");
4208                                         event->flags |= EVENT_FL_FAILED;
4209                                         goto out_failed;
4210                                 }
4211 
4212                                 len = ((unsigned long)ptr + 1) -
4213                                         (unsigned long)saveptr;
4214 
4215                                 /* should never happen */
4216                                 if (len > 31) {
4217                                         do_warning("bad format!");
4218                                         event->flags |= EVENT_FL_FAILED;
4219                                         len = 31;
4220                                 }
4221 
4222                                 memcpy(format, saveptr, len);
4223                                 format[len] = 0;
4224 
4225                                 val = eval_num_arg(data, size, event, arg);
4226                                 arg = arg->next;
4227 
4228                                 if (show_func) {
4229                                         func = find_func(pevent, val);
4230                                         if (func) {
4231                                                 trace_seq_puts(s, func->func);
4232                                                 if (show_func == 'F')
4233                                                         trace_seq_printf(s,
4234                                                                "+0x%llx",
4235                                                                val - func->addr);
4236                                                 break;
4237                                         }
4238                                 }
4239                                 if (pevent->long_size == 8 && ls &&
4240                                     sizeof(long) != 8) {
4241                                         char *p;
4242 
4243                                         ls = 2;
4244                                         /* make %l into %ll */
4245                                         p = strchr(format, 'l');
4246                                         if (p)
4247                                                 memmove(p+1, p, strlen(p)+1);
4248                                         else if (strcmp(format, "%p") == 0)
4249                                                 strcpy(format, "0x%llx");
4250                                 }
4251                                 switch (ls) {
4252                                 case -2:
4253                                         if (len_as_arg)
4254                                                 trace_seq_printf(s, format, len_arg, (char)val);
4255                                         else
4256                                                 trace_seq_printf(s, format, (char)val);
4257                                         break;
4258                                 case -1:
4259                                         if (len_as_arg)
4260                                                 trace_seq_printf(s, format, len_arg, (short)val);
4261                                         else
4262                                                 trace_seq_printf(s, format, (short)val);
4263                                         break;
4264                                 case 0:
4265                                         if (len_as_arg)
4266                                                 trace_seq_printf(s, format, len_arg, (int)val);
4267                                         else
4268                                                 trace_seq_printf(s, format, (int)val);
4269                                         break;
4270                                 case 1:
4271                                         if (len_as_arg)
4272                                                 trace_seq_printf(s, format, len_arg, (long)val);
4273                                         else
4274                                                 trace_seq_printf(s, format, (long)val);
4275                                         break;
4276                                 case 2:
4277                                         if (len_as_arg)
4278                                                 trace_seq_printf(s, format, len_arg,
4279                                                                  (long long)val);
4280                                         else
4281                                                 trace_seq_printf(s, format, (long long)val);
4282                                         break;
4283                                 default:
4284                                         do_warning("bad count (%d)", ls);
4285                                         event->flags |= EVENT_FL_FAILED;
4286                                 }
4287                                 break;
4288                         case 's':
4289                                 if (!arg) {
4290                                         do_warning("no matching argument");
4291                                         event->flags |= EVENT_FL_FAILED;
4292                                         goto out_failed;
4293                                 }
4294 
4295                                 len = ((unsigned long)ptr + 1) -
4296                                         (unsigned long)saveptr;
4297 
4298                                 /* should never happen */
4299                                 if (len > 31) {
4300                                         do_warning("bad format!");
4301                                         event->flags |= EVENT_FL_FAILED;
4302                                         len = 31;
4303                                 }
4304 
4305                                 memcpy(format, saveptr, len);
4306                                 format[len] = 0;
4307                                 if (!len_as_arg)
4308                                         len_arg = -1;
4309                                 print_str_arg(s, data, size, event,
4310                                               format, len_arg, arg);
4311                                 arg = arg->next;
4312                                 break;
4313                         default:
4314                                 trace_seq_printf(s, ">%c<", *ptr);
4315 
4316                         }
4317                 } else
4318                         trace_seq_putc(s, *ptr);
4319         }
4320 
4321         if (event->flags & EVENT_FL_FAILED) {
4322 out_failed:
4323                 trace_seq_printf(s, "[FAILED TO PARSE]");
4324         }
4325 
4326         if (args) {
4327                 free_args(args);
4328                 free(bprint_fmt);
4329         }
4330 }
4331 
4332 /**
4333  * pevent_data_lat_fmt - parse the data for the latency format
4334  * @pevent: a handle to the pevent
4335  * @s: the trace_seq to write to
4336  * @record: the record to read from
4337  *
4338  * This parses out the Latency format (interrupts disabled,
4339  * need rescheduling, in hard/soft interrupt, preempt count
4340  * and lock depth) and places it into the trace_seq.
4341  */
4342 void pevent_data_lat_fmt(struct pevent *pevent,
4343                          struct trace_seq *s, struct pevent_record *record)
4344 {
4345         static int check_lock_depth = 1;
4346         static int check_migrate_disable = 1;
4347         static int lock_depth_exists;
4348         static int migrate_disable_exists;
4349         unsigned int lat_flags;
4350         unsigned int pc;
4351         int lock_depth;
4352         int migrate_disable;
4353         int hardirq;
4354         int softirq;
4355         void *data = record->data;
4356 
4357         lat_flags = parse_common_flags(pevent, data);
4358         pc = parse_common_pc(pevent, data);
4359         /* lock_depth may not always exist */
4360         if (lock_depth_exists)
4361                 lock_depth = parse_common_lock_depth(pevent, data);
4362         else if (check_lock_depth) {
4363                 lock_depth = parse_common_lock_depth(pevent, data);
4364                 if (lock_depth < 0)
4365                         check_lock_depth = 0;
4366                 else
4367                         lock_depth_exists = 1;
4368         }
4369 
4370         /* migrate_disable may not always exist */
4371         if (migrate_disable_exists)
4372                 migrate_disable = parse_common_migrate_disable(pevent, data);
4373         else if (check_migrate_disable) {
4374                 migrate_disable = parse_common_migrate_disable(pevent, data);
4375                 if (migrate_disable < 0)
4376                         check_migrate_disable = 0;
4377                 else
4378                         migrate_disable_exists = 1;
4379         }
4380 
4381         hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
4382         softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
4383 
4384         trace_seq_printf(s, "%c%c%c",
4385                (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
4386                (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
4387                'X' : '.',
4388                (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
4389                'N' : '.',
4390                (hardirq && softirq) ? 'H' :
4391                hardirq ? 'h' : softirq ? 's' : '.');
4392 
4393         if (pc)
4394                 trace_seq_printf(s, "%x", pc);
4395         else
4396                 trace_seq_putc(s, '.');
4397 
4398         if (migrate_disable_exists) {
4399                 if (migrate_disable < 0)
4400                         trace_seq_putc(s, '.');
4401                 else
4402                         trace_seq_printf(s, "%d", migrate_disable);
4403         }
4404 
4405         if (lock_depth_exists) {
4406                 if (lock_depth < 0)
4407                         trace_seq_putc(s, '.');
4408                 else
4409                         trace_seq_printf(s, "%d", lock_depth);
4410         }
4411 
4412         trace_seq_terminate(s);
4413 }
4414 
4415 /**
4416  * pevent_data_type - parse out the given event type
4417  * @pevent: a handle to the pevent
4418  * @rec: the record to read from
4419  *
4420  * This returns the event id from the @rec.
4421  */
4422 int pevent_data_type(struct pevent *pevent, struct pevent_record *rec)
4423 {
4424         return trace_parse_common_type(pevent, rec->data);
4425 }
4426 
4427 /**
4428  * pevent_data_event_from_type - find the event by a given type
4429  * @pevent: a handle to the pevent
4430  * @type: the type of the event.
4431  *
4432  * This returns the event form a given @type;
4433  */
4434 struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
4435 {
4436         return pevent_find_event(pevent, type);
4437 }
4438 
4439 /**
4440  * pevent_data_pid - parse the PID from raw data
4441  * @pevent: a handle to the pevent
4442  * @rec: the record to parse
4443  *
4444  * This returns the PID from a raw data.
4445  */
4446 int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec)
4447 {
4448         return parse_common_pid(pevent, rec->data);
4449 }
4450 
4451 /**
4452  * pevent_data_comm_from_pid - return the command line from PID
4453  * @pevent: a handle to the pevent
4454  * @pid: the PID of the task to search for
4455  *
4456  * This returns a pointer to the command line that has the given
4457  * @pid.
4458  */
4459 const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
4460 {
4461         const char *comm;
4462 
4463         comm = find_cmdline(pevent, pid);
4464         return comm;
4465 }
4466 
4467 /**
4468  * pevent_data_comm_from_pid - parse the data into the print format
4469  * @s: the trace_seq to write to
4470  * @event: the handle to the event
4471  * @record: the record to read from
4472  *
4473  * This parses the raw @data using the given @event information and
4474  * writes the print format into the trace_seq.
4475  */
4476 void pevent_event_info(struct trace_seq *s, struct event_format *event,
4477                        struct pevent_record *record)
4478 {
4479         int print_pretty = 1;
4480 
4481         if (event->pevent->print_raw || (event->flags & EVENT_FL_PRINTRAW))
4482                 print_event_fields(s, record->data, record->size, event);
4483         else {
4484 
4485                 if (event->handler && !(event->flags & EVENT_FL_NOHANDLE))
4486                         print_pretty = event->handler(s, record, event,
4487                                                       event->context);
4488 
4489                 if (print_pretty)
4490                         pretty_print(s, record->data, record->size, event);
4491         }
4492 
4493         trace_seq_terminate(s);
4494 }
4495 
4496 static bool is_timestamp_in_us(char *trace_clock, bool use_trace_clock)
4497 {
4498         if (!use_trace_clock)
4499                 return true;
4500 
4501         if (!strcmp(trace_clock, "local") || !strcmp(trace_clock, "global")
4502             || !strcmp(trace_clock, "uptime") || !strcmp(trace_clock, "perf"))
4503                 return true;
4504 
4505         /* trace_clock is setting in tsc or counter mode */
4506         return false;
4507 }
4508 
4509 void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
4510                         struct pevent_record *record, bool use_trace_clock)
4511 {
4512         static const char *spaces = "                    "; /* 20 spaces */
4513         struct event_format *event;
4514         unsigned long secs;
4515         unsigned long usecs;
4516         unsigned long nsecs;
4517         const char *comm;
4518         void *data = record->data;
4519         int type;
4520         int pid;
4521         int len;
4522         int p;
4523         bool use_usec_format;
4524 
4525         use_usec_format = is_timestamp_in_us(pevent->trace_clock,
4526                                                         use_trace_clock);
4527         if (use_usec_format) {
4528                 secs = record->ts / NSECS_PER_SEC;
4529                 nsecs = record->ts - secs * NSECS_PER_SEC;
4530         }
4531 
4532         if (record->size < 0) {
4533                 do_warning("ug! negative record size %d", record->size);
4534                 return;
4535         }
4536 
4537         type = trace_parse_common_type(pevent, data);
4538 
4539         event = pevent_find_event(pevent, type);
4540         if (!event) {
4541                 do_warning("ug! no event found for type %d", type);
4542                 return;
4543         }
4544 
4545         pid = parse_common_pid(pevent, data);
4546         comm = find_cmdline(pevent, pid);
4547 
4548         if (pevent->latency_format) {
4549                 trace_seq_printf(s, "%8.8s-%-5d %3d",
4550                        comm, pid, record->cpu);
4551                 pevent_data_lat_fmt(pevent, s, record);
4552         } else
4553                 trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
4554 
4555         if (use_usec_format) {
4556                 if (pevent->flags & PEVENT_NSEC_OUTPUT) {
4557                         usecs = nsecs;
4558                         p = 9;
4559                 } else {
4560                         usecs = (nsecs + 500) / NSECS_PER_USEC;
4561                         p = 6;
4562                 }
4563 
4564                 trace_seq_printf(s, " %5lu.%0*lu: %s: ",
4565                                         secs, p, usecs, event->name);
4566         } else
4567                 trace_seq_printf(s, " %12llu: %s: ",
4568                                         record->ts, event->name);
4569 
4570         /* Space out the event names evenly. */
4571         len = strlen(event->name);
4572         if (len < 20)
4573                 trace_seq_printf(s, "%.*s", 20 - len, spaces);
4574 
4575         pevent_event_info(s, event, record);
4576 }
4577 
4578 static int events_id_cmp(const void *a, const void *b)
4579 {
4580         struct event_format * const * ea = a;
4581         struct event_format * const * eb = b;
4582 
4583         if ((*ea)->id < (*eb)->id)
4584                 return -1;
4585 
4586         if ((*ea)->id > (*eb)->id)
4587                 return 1;
4588 
4589         return 0;
4590 }
4591 
4592 static int events_name_cmp(const void *a, const void *b)
4593 {
4594         struct event_format * const * ea = a;
4595         struct event_format * const * eb = b;
4596         int res;
4597 
4598         res = strcmp((*ea)->name, (*eb)->name);
4599         if (res)
4600                 return res;
4601 
4602         res = strcmp((*ea)->system, (*eb)->system);
4603         if (res)
4604                 return res;
4605 
4606         return events_id_cmp(a, b);
4607 }
4608 
4609 static int events_system_cmp(const void *a, const void *b)
4610 {
4611         struct event_format * const * ea = a;
4612         struct event_format * const * eb = b;
4613         int res;
4614 
4615         res = strcmp((*ea)->system, (*eb)->system);
4616         if (res)
4617                 return res;
4618 
4619         res = strcmp((*ea)->name, (*eb)->name);
4620         if (res)
4621                 return res;
4622 
4623         return events_id_cmp(a, b);
4624 }
4625 
4626 struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
4627 {
4628         struct event_format **events;
4629         int (*sort)(const void *a, const void *b);
4630 
4631         events = pevent->sort_events;
4632 
4633         if (events && pevent->last_type == sort_type)
4634                 return events;
4635 
4636         if (!events) {
4637                 events = malloc(sizeof(*events) * (pevent->nr_events + 1));
4638                 if (!events)
4639                         return NULL;
4640 
4641                 memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
4642                 events[pevent->nr_events] = NULL;
4643 
4644                 pevent->sort_events = events;
4645 
4646                 /* the internal events are sorted by id */
4647                 if (sort_type == EVENT_SORT_ID) {
4648                         pevent->last_type = sort_type;
4649                         return events;
4650                 }
4651         }
4652 
4653         switch (sort_type) {
4654         case EVENT_SORT_ID:
4655                 sort = events_id_cmp;
4656                 break;
4657         case EVENT_SORT_NAME:
4658                 sort = events_name_cmp;
4659                 break;
4660         case EVENT_SORT_SYSTEM:
4661                 sort = events_system_cmp;
4662                 break;
4663         default:
4664                 return events;
4665         }
4666 
4667         qsort(events, pevent->nr_events, sizeof(*events), sort);
4668         pevent->last_type = sort_type;
4669 
4670         return events;
4671 }
4672 
4673 static struct format_field **
4674 get_event_fields(const char *type, const char *name,
4675                  int count, struct format_field *list)
4676 {
4677         struct format_field **fields;
4678         struct format_field *field;
4679         int i = 0;
4680 
4681         fields = malloc(sizeof(*fields) * (count + 1));
4682         if (!fields)
4683                 return NULL;
4684 
4685         for (field = list; field; field = field->next) {
4686                 fields[i++] = field;
4687                 if (i == count + 1) {
4688                         do_warning("event %s has more %s fields than specified",
4689                                 name, type);
4690                         i--;
4691                         break;
4692                 }
4693         }
4694 
4695         if (i != count)
4696                 do_warning("event %s has less %s fields than specified",
4697                         name, type);
4698 
4699         fields[i] = NULL;
4700 
4701         return fields;
4702 }
4703 
4704 /**
4705  * pevent_event_common_fields - return a list of common fields for an event
4706  * @event: the event to return the common fields of.
4707  *
4708  * Returns an allocated array of fields. The last item in the array is NULL.
4709  * The array must be freed with free().
4710  */
4711 struct format_field **pevent_event_common_fields(struct event_format *event)
4712 {
4713         return get_event_fields("common", event->name,
4714                                 event->format.nr_common,
4715                                 event->format.common_fields);
4716 }
4717 
4718 /**
4719  * pevent_event_fields - return a list of event specific fields for an event
4720  * @event: the event to return the fields of.
4721  *
4722  * Returns an allocated array of fields. The last item in the array is NULL.
4723  * The array must be freed with free().
4724  */
4725 struct format_field **pevent_event_fields(struct event_format *event)
4726 {
4727         return get_event_fields("event", event->name,
4728                                 event->format.nr_fields,
4729                                 event->format.fields);
4730 }
4731 
4732 static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
4733 {
4734         trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
4735         if (field->next) {
4736                 trace_seq_puts(s, ", ");
4737                 print_fields(s, field->next);
4738         }
4739 }
4740 
4741 /* for debugging */
4742 static void print_args(struct print_arg *args)
4743 {
4744         int print_paren = 1;
4745         struct trace_seq s;
4746 
4747         switch (args->type) {
4748         case PRINT_NULL:
4749                 printf("null");
4750                 break;
4751         case PRINT_ATOM:
4752                 printf("%s", args->atom.atom);
4753                 break;
4754         case PRINT_FIELD:
4755                 printf("REC->%s", args->field.name);
4756                 break;
4757         case PRINT_FLAGS:
4758                 printf("__print_flags(");
4759                 print_args(args->flags.field);
4760                 printf(", %s, ", args->flags.delim);
4761                 trace_seq_init(&s);
4762                 print_fields(&s, args->flags.flags);
4763                 trace_seq_do_printf(&s);
4764                 trace_seq_destroy(&s);
4765                 printf(")");
4766                 break;
4767         case PRINT_SYMBOL:
4768                 printf("__print_symbolic(");
4769                 print_args(args->symbol.field);
4770                 printf(", ");
4771                 trace_seq_init(&s);
4772                 print_fields(&s, args->symbol.symbols);
4773                 trace_seq_do_printf(&s);
4774                 trace_seq_destroy(&s);
4775                 printf(")");
4776                 break;
4777         case PRINT_HEX:
4778                 printf("__print_hex(");
4779                 print_args(args->hex.field);
4780                 printf(", ");
4781                 print_args(args->hex.size);
4782                 printf(")");
4783                 break;
4784         case PRINT_STRING:
4785         case PRINT_BSTRING:
4786                 printf("__get_str(%s)", args->string.string);
4787                 break;
4788         case PRINT_TYPE:
4789                 printf("(%s)", args->typecast.type);
4790                 print_args(args->typecast.item);
4791                 break;
4792         case PRINT_OP:
4793                 if (strcmp(args->op.op, ":") == 0)
4794                         print_paren = 0;
4795                 if (print_paren)
4796                         printf("(");
4797                 print_args(args->op.left);
4798                 printf(" %s ", args->op.op);
4799                 print_args(args->op.right);
4800                 if (print_paren)
4801                         printf(")");
4802                 break;
4803         default:
4804                 /* we should warn... */
4805                 return;
4806         }
4807         if (args->next) {
4808                 printf("\n");
4809                 print_args(args->next);
4810         }
4811 }
4812 
4813 static void parse_header_field(const char *field,
4814                                int *offset, int *size, int mandatory)
4815 {
4816         unsigned long long save_input_buf_ptr;
4817         unsigned long long save_input_buf_siz;
4818         char *token;
4819         int type;
4820 
4821         save_input_buf_ptr = input_buf_ptr;
4822         save_input_buf_siz = input_buf_siz;
4823 
4824         if (read_expected(EVENT_ITEM, "field") < 0)
4825                 return;
4826         if (read_expected(EVENT_OP, ":") < 0)
4827                 return;
4828 
4829         /* type */
4830         if (read_expect_type(EVENT_ITEM, &token) < 0)
4831                 goto fail;
4832         free_token(token);
4833 
4834         /*
4835          * If this is not a mandatory field, then test it first.
4836          */
4837         if (mandatory) {
4838                 if (read_expected(EVENT_ITEM, field) < 0)
4839                         return;
4840         } else {
4841                 if (read_expect_type(EVENT_ITEM, &token) < 0)
4842                         goto fail;
4843                 if (strcmp(token, field) != 0)
4844                         goto discard;
4845                 free_token(token);
4846         }
4847 
4848         if (read_expected(EVENT_OP, ";") < 0)
4849                 return;
4850         if (read_expected(EVENT_ITEM, "offset") < 0)
4851                 return;
4852         if (read_expected(EVENT_OP, ":") < 0)
4853                 return;
4854         if (read_expect_type(EVENT_ITEM, &token) < 0)
4855                 goto fail;
4856         *offset = atoi(token);
4857         free_token(token);
4858         if (read_expected(EVENT_OP, ";") < 0)
4859                 return;
4860         if (read_expected(EVENT_ITEM, "size") < 0)
4861                 return;
4862         if (read_expected(EVENT_OP, ":") < 0)
4863                 return;
4864         if (read_expect_type(EVENT_ITEM, &token) < 0)
4865                 goto fail;
4866         *size = atoi(token);
4867         free_token(token);
4868         if (read_expected(EVENT_OP, ";") < 0)
4869                 return;
4870         type = read_token(&token);
4871         if (type != EVENT_NEWLINE) {
4872                 /* newer versions of the kernel have a "signed" type */
4873                 if (type != EVENT_ITEM)
4874                         goto fail;
4875 
4876                 if (strcmp(token, "signed") != 0)
4877                         goto fail;
4878 
4879                 free_token(token);
4880 
4881                 if (read_expected(EVENT_OP, ":") < 0)
4882                         return;
4883 
4884                 if (read_expect_type(EVENT_ITEM, &token))
4885                         goto fail;
4886 
4887                 free_token(token);
4888                 if (read_expected(EVENT_OP, ";") < 0)
4889                         return;
4890 
4891                 if (read_expect_type(EVENT_NEWLINE, &token))
4892                         goto fail;
4893         }
4894  fail:
4895         free_token(token);
4896         return;
4897 
4898  discard:
4899         input_buf_ptr = save_input_buf_ptr;
4900         input_buf_siz = save_input_buf_siz;
4901         *offset = 0;
4902         *size = 0;
4903         free_token(token);
4904 }
4905 
4906 /**
4907  * pevent_parse_header_page - parse the data stored in the header page
4908  * @pevent: the handle to the pevent
4909  * @buf: the buffer storing the header page format string
4910  * @size: the size of @buf
4911  * @long_size: the long size to use if there is no header
4912  *
4913  * This parses the header page format for information on the
4914  * ring buffer used. The @buf should be copied from
4915  *
4916  * /sys/kernel/debug/tracing/events/header_page
4917  */
4918 int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
4919                              int long_size)
4920 {
4921         int ignore;
4922 
4923         if (!size) {
4924                 /*
4925                  * Old kernels did not have header page info.
4926                  * Sorry but we just use what we find here in user space.
4927                  */
4928                 pevent->header_page_ts_size = sizeof(long long);
4929                 pevent->header_page_size_size = long_size;
4930                 pevent->header_page_data_offset = sizeof(long long) + long_size;
4931                 pevent->old_format = 1;
4932                 return -1;
4933         }
4934         init_input_buf(buf, size);
4935 
4936         parse_header_field("timestamp", &pevent->header_page_ts_offset,
4937                            &pevent->header_page_ts_size, 1);
4938         parse_header_field("commit", &pevent->header_page_size_offset,
4939                            &pevent->header_page_size_size, 1);
4940         parse_header_field("overwrite", &pevent->header_page_overwrite,
4941                            &ignore, 0);
4942         parse_header_field("data", &pevent->header_page_data_offset,
4943                            &pevent->header_page_data_size, 1);
4944 
4945         return 0;
4946 }
4947 
4948 static int event_matches(struct event_format *event,
4949                          int id, const char *sys_name,
4950                          const char *event_name)
4951 {
4952         if (id >= 0 && id != event->id)
4953                 return 0;
4954 
4955         if (event_name && (strcmp(event_name, event->name) != 0))
4956                 return 0;
4957 
4958         if (sys_name && (strcmp(sys_name, event->system) != 0))
4959                 return 0;
4960 
4961         return 1;
4962 }
4963 
4964 static void free_handler(struct event_handler *handle)
4965 {
4966         free((void *)handle->sys_name);
4967         free((void *)handle->event_name);
4968         free(handle);
4969 }
4970 
4971 static int find_event_handle(struct pevent *pevent, struct event_format *event)
4972 {
4973         struct event_handler *handle, **next;
4974 
4975         for (next = &pevent->handlers; *next;
4976              next = &(*next)->next) {
4977                 handle = *next;
4978                 if (event_matches(event, handle->id,
4979                                   handle->sys_name,
4980                                   handle->event_name))
4981                         break;
4982         }
4983 
4984         if (!(*next))
4985                 return 0;
4986 
4987         pr_stat("overriding event (%d) %s:%s with new print handler",
4988                 event->id, event->system, event->name);
4989 
4990         event->handler = handle->func;
4991         event->context = handle->context;
4992 
4993         *next = handle->next;
4994         free_handler(handle);
4995 
4996         return 1;
4997 }
4998 
4999 /**
5000  * __pevent_parse_format - parse the event format
5001  * @buf: the buffer storing the event format string
5002  * @size: the size of @buf
5003  * @sys: the system the event belongs to
5004  *
5005  * This parses the event format and creates an event structure
5006  * to quickly parse raw data for a given event.
5007  *
5008  * These files currently come from:
5009  *
5010  * /sys/kernel/debug/tracing/events/.../.../format
5011  */
5012 enum pevent_errno __pevent_parse_format(struct event_format **eventp,
5013                                         struct pevent *pevent, const char *buf,
5014                                         unsigned long size, const char *sys)
5015 {
5016         struct event_format *event;
5017         int ret;
5018 
5019         init_input_buf(buf, size);
5020 
5021         *eventp = event = alloc_event();
5022         if (!event)
5023                 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5024 
5025         event->name = event_read_name();
5026         if (!event->name) {
5027                 /* Bad event? */
5028                 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5029                 goto event_alloc_failed;
5030         }
5031 
5032         if (strcmp(sys, "ftrace") == 0) {
5033                 event->flags |= EVENT_FL_ISFTRACE;
5034 
5035                 if (strcmp(event->name, "bprint") == 0)
5036                         event->flags |= EVENT_FL_ISBPRINT;
5037         }
5038                 
5039         event->id = event_read_id();
5040         if (event->id < 0) {
5041                 ret = PEVENT_ERRNO__READ_ID_FAILED;
5042                 /*
5043                  * This isn't an allocation error actually.
5044                  * But as the ID is critical, just bail out.
5045                  */
5046                 goto event_alloc_failed;
5047         }
5048 
5049         event->system = strdup(sys);
5050         if (!event->system) {
5051                 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5052                 goto event_alloc_failed;
5053         }
5054 
5055         /* Add pevent to event so that it can be referenced */
5056         event->pevent = pevent;
5057 
5058         ret = event_read_format(event);
5059         if (ret < 0) {
5060                 ret = PEVENT_ERRNO__READ_FORMAT_FAILED;
5061                 goto event_parse_failed;
5062         }
5063 
5064         /*
5065          * If the event has an override, don't print warnings if the event
5066          * print format fails to parse.
5067          */
5068         if (pevent && find_event_handle(pevent, event))
5069                 show_warning = 0;
5070 
5071         ret = event_read_print(event);
5072         show_warning = 1;
5073 
5074         if (ret < 0) {
5075                 ret = PEVENT_ERRNO__READ_PRINT_FAILED;
5076                 goto event_parse_failed;
5077         }
5078 
5079         if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
5080                 struct format_field *field;
5081                 struct print_arg *arg, **list;
5082 
5083                 /* old ftrace had no args */
5084                 list = &event->print_fmt.args;
5085                 for (field = event->format.fields; field; field = field->next) {
5086                         arg = alloc_arg();
5087                         if (!arg) {
5088                                 event->flags |= EVENT_FL_FAILED;
5089                                 return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
5090                         }
5091                         arg->type = PRINT_FIELD;
5092                         arg->field.name = strdup(field->name);
5093                         if (!arg->field.name) {
5094                                 event->flags |= EVENT_FL_FAILED;
5095                                 free_arg(arg);
5096                                 return PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED;
5097                         }
5098                         arg->field.field = field;
5099                         *list = arg;
5100                         list = &arg->next;
5101                 }
5102                 return 0;
5103         }
5104 
5105         return 0;
5106 
5107  event_parse_failed:
5108         event->flags |= EVENT_FL_FAILED;
5109         return ret;
5110 
5111  event_alloc_failed:
5112         free(event->system);
5113         free(event->name);
5114         free(event);
5115         *eventp = NULL;
5116         return ret;
5117 }
5118 
5119 /**
5120  * pevent_parse_format - parse the event format
5121  * @buf: the buffer storing the event format string
5122  * @size: the size of @buf
5123  * @sys: the system the event belongs to
5124  *
5125  * This parses the event format and creates an event structure
5126  * to quickly parse raw data for a given event.
5127  *
5128  * These files currently come from:
5129  *
5130  * /sys/kernel/debug/tracing/events/.../.../format
5131  */
5132 enum pevent_errno pevent_parse_format(struct event_format **eventp, const char *buf,
5133                                       unsigned long size, const char *sys)
5134 {
5135         return __pevent_parse_format(eventp, NULL, buf, size, sys);
5136 }
5137 
5138 /**
5139  * pevent_parse_event - parse the event format
5140  * @pevent: the handle to the pevent
5141  * @buf: the buffer storing the event format string
5142  * @size: the size of @buf
5143  * @sys: the system the event belongs to
5144  *
5145  * This parses the event format and creates an event structure
5146  * to quickly parse raw data for a given event.
5147  *
5148  * These files currently come from:
5149  *
5150  * /sys/kernel/debug/tracing/events/.../.../format
5151  */
5152 enum pevent_errno pevent_parse_event(struct pevent *pevent, const char *buf,
5153                                      unsigned long size, const char *sys)
5154 {
5155         struct event_format *event = NULL;
5156         int ret = __pevent_parse_format(&event, pevent, buf, size, sys);
5157 
5158         if (event == NULL)
5159                 return ret;
5160 
5161         if (add_event(pevent, event)) {
5162                 ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5163                 goto event_add_failed;
5164         }
5165 
5166 #define PRINT_ARGS 0
5167         if (PRINT_ARGS && event->print_fmt.args)
5168                 print_args(event->print_fmt.args);
5169 
5170         return 0;
5171 
5172 event_add_failed:
5173         pevent_free_format(event);
5174         return ret;
5175 }
5176 
5177 #undef _PE
5178 #define _PE(code, str) str
5179 static const char * const pevent_error_str[] = {
5180         PEVENT_ERRORS
5181 };
5182 #undef _PE
5183 
5184 int pevent_strerror(struct pevent *pevent __maybe_unused,
5185                     enum pevent_errno errnum, char *buf, size_t buflen)
5186 {
5187         int idx;
5188         const char *msg;
5189 
5190         if (errnum >= 0) {
5191                 msg = strerror_r(errnum, buf, buflen);
5192                 if (msg != buf) {
5193                         size_t len = strlen(msg);
5194                         memcpy(buf, msg, min(buflen - 1, len));
5195                         *(buf + min(buflen - 1, len)) = '\0';
5196                 }
5197                 return 0;
5198         }
5199 
5200         if (errnum <= __PEVENT_ERRNO__START ||
5201             errnum >= __PEVENT_ERRNO__END)
5202                 return -1;
5203 
5204         idx = errnum - __PEVENT_ERRNO__START - 1;
5205         msg = pevent_error_str[idx];
5206 
5207         switch (errnum) {
5208         case PEVENT_ERRNO__MEM_ALLOC_FAILED:
5209         case PEVENT_ERRNO__PARSE_EVENT_FAILED:
5210         case PEVENT_ERRNO__READ_ID_FAILED:
5211         case PEVENT_ERRNO__READ_FORMAT_FAILED:
5212         case PEVENT_ERRNO__READ_PRINT_FAILED:
5213         case PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED:
5214         case PEVENT_ERRNO__INVALID_ARG_TYPE:
5215                 snprintf(buf, buflen, "%s", msg);
5216                 break;
5217 
5218         default:
5219                 /* cannot reach here */
5220                 break;
5221         }
5222 
5223         return 0;
5224 }
5225 
5226 int get_field_val(struct trace_seq *s, struct format_field *field,
5227                   const char *name, struct pevent_record *record,
5228                   unsigned long long *val, int err)
5229 {
5230         if (!field) {
5231                 if (err)
5232                         trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
5233                 return -1;
5234         }
5235 
5236         if (pevent_read_number_field(field, record->data, val)) {
5237                 if (err)
5238                         trace_seq_printf(s, " %s=INVALID", name);
5239                 return -1;
5240         }
5241 
5242         return 0;
5243 }
5244 
5245 /**
5246  * pevent_get_field_raw - return the raw pointer into the data field
5247  * @s: The seq to print to on error
5248  * @event: the event that the field is for
5249  * @name: The name of the field
5250  * @record: The record with the field name.
5251  * @len: place to store the field length.
5252  * @err: print default error if failed.
5253  *
5254  * Returns a pointer into record->data of the field and places
5255  * the length of the field in @len.
5256  *
5257  * On failure, it returns NULL.
5258  */
5259 void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
5260                            const char *name, struct pevent_record *record,
5261                            int *len, int err)
5262 {
5263         struct format_field *field;
5264         void *data = record->data;
5265         unsigned offset;
5266         int dummy;
5267 
5268         if (!event)
5269                 return NULL;
5270 
5271         field = pevent_find_field(event, name);
5272 
5273         if (!field) {
5274                 if (err)
5275                         trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
5276                 return NULL;
5277         }
5278 
5279         /* Allow @len to be NULL */
5280         if (!len)
5281                 len = &dummy;
5282 
5283         offset = field->offset;
5284         if (field->flags & FIELD_IS_DYNAMIC) {
5285                 offset = pevent_read_number(event->pevent,
5286                                             data + offset, field->size);
5287                 *len = offset >> 16;
5288                 offset &= 0xffff;
5289         } else
5290                 *len = field->size;
5291 
5292         return data + offset;
5293 }
5294 
5295 /**
5296  * pevent_get_field_val - find a field and return its value
5297  * @s: The seq to print to on error
5298  * @event: the event that the field is for
5299  * @name: The name of the field
5300  * @record: The record with the field name.
5301  * @val: place to store the value of the field.
5302  * @err: print default error if failed.
5303  *
5304  * Returns 0 on success -1 on field not found.
5305  */
5306 int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
5307                          const char *name, struct pevent_record *record,
5308                          unsigned long long *val, int err)
5309 {
5310         struct format_field *field;
5311 
5312         if (!event)
5313                 return -1;
5314 
5315         field = pevent_find_field(event, name);
5316 
5317         return get_field_val(s, field, name, record, val, err);
5318 }
5319 
5320 /**
5321  * pevent_get_common_field_val - find a common field and return its value
5322  * @s: The seq to print to on error
5323  * @event: the event that the field is for
5324  * @name: The name of the field
5325  * @record: The record with the field name.
5326  * @val: place to store the value of the field.
5327  * @err: print default error if failed.
5328  *
5329  * Returns 0 on success -1 on field not found.
5330  */
5331 int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
5332                                 const char *name, struct pevent_record *record,
5333                                 unsigned long long *val, int err)
5334 {
5335         struct format_field *field;
5336 
5337         if (!event)
5338                 return -1;
5339 
5340         field = pevent_find_common_field(event, name);
5341 
5342         return get_field_val(s, field, name, record, val, err);
5343 }
5344 
5345 /**
5346  * pevent_get_any_field_val - find a any field and return its value
5347  * @s: The seq to print to on error
5348  * @event: the event that the field is for
5349  * @name: The name of the field
5350  * @record: The record with the field name.
5351  * @val: place to store the value of the field.
5352  * @err: print default error if failed.
5353  *
5354  * Returns 0 on success -1 on field not found.
5355  */
5356 int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
5357                              const char *name, struct pevent_record *record,
5358                              unsigned long long *val, int err)
5359 {
5360         struct format_field *field;
5361 
5362         if (!event)
5363                 return -1;
5364 
5365         field = pevent_find_any_field(event, name);
5366 
5367         return get_field_val(s, field, name, record, val, err);
5368 }
5369 
5370 /**
5371  * pevent_print_num_field - print a field and a format
5372  * @s: The seq to print to
5373  * @fmt: The printf format to print the field with.
5374  * @event: the event that the field is for
5375  * @name: The name of the field
5376  * @record: The record with the field name.
5377  * @err: print default error if failed.
5378  *
5379  * Returns: 0 on success, -1 field not found, or 1 if buffer is full.
5380  */
5381 int pevent_print_num_field(struct trace_seq *s, const char *fmt,
5382                            struct event_format *event, const char *name,
5383                            struct pevent_record *record, int err)
5384 {
5385         struct format_field *field = pevent_find_field(event, name);
5386         unsigned long long val;
5387 
5388         if (!field)
5389                 goto failed;
5390 
5391         if (pevent_read_number_field(field, record->data, &val))
5392                 goto failed;
5393 
5394         return trace_seq_printf(s, fmt, val);
5395 
5396  failed:
5397         if (err)
5398                 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
5399         return -1;
5400 }
5401 
5402 /**
5403  * pevent_print_func_field - print a field and a format for function pointers
5404  * @s: The seq to print to
5405  * @fmt: The printf format to print the field with.
5406  * @event: the event that the field is for
5407  * @name: The name of the field
5408  * @record: The record with the field name.
5409  * @err: print default error if failed.
5410  *
5411  * Returns: 0 on success, -1 field not found, or 1 if buffer is full.
5412  */
5413 int pevent_print_func_field(struct trace_seq *s, const char *fmt,
5414                             struct event_format *event, const char *name,
5415                             struct pevent_record *record, int err)
5416 {
5417         struct format_field *field = pevent_find_field(event, name);
5418         struct pevent *pevent = event->pevent;
5419         unsigned long long val;
5420         struct func_map *func;
5421         char tmp[128];
5422 
5423         if (!field)
5424                 goto failed;
5425 
5426         if (pevent_read_number_field(field, record->data, &val))
5427                 goto failed;
5428 
5429         func = find_func(pevent, val);
5430 
5431         if (func)
5432                 snprintf(tmp, 128, "%s/0x%llx", func->func, func->addr - val);
5433         else
5434                 sprintf(tmp, "0x%08llx", val);
5435 
5436         return trace_seq_printf(s, fmt, tmp);
5437 
5438  failed:
5439         if (err)
5440                 trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
5441         return -1;
5442 }
5443 
5444 static void free_func_handle(struct pevent_function_handler *func)
5445 {
5446         struct pevent_func_params *params;
5447 
5448         free(func->name);
5449 
5450         while (func->params) {
5451                 params = func->params;
5452                 func->params = params->next;
5453                 free(params);
5454         }
5455 
5456         free(func);
5457 }
5458 
5459 /**
5460  * pevent_register_print_function - register a helper function
5461  * @pevent: the handle to the pevent
5462  * @func: the function to process the helper function
5463  * @ret_type: the return type of the helper function
5464  * @name: the name of the helper function
5465  * @parameters: A list of enum pevent_func_arg_type
5466  *
5467  * Some events may have helper functions in the print format arguments.
5468  * This allows a plugin to dynamically create a way to process one
5469  * of these functions.
5470  *
5471  * The @parameters is a variable list of pevent_func_arg_type enums that
5472  * must end with PEVENT_FUNC_ARG_VOID.
5473  */
5474 int pevent_register_print_function(struct pevent *pevent,
5475                                    pevent_func_handler func,
5476                                    enum pevent_func_arg_type ret_type,
5477                                    char *name, ...)
5478 {
5479         struct pevent_function_handler *func_handle;
5480         struct pevent_func_params **next_param;
5481         struct pevent_func_params *param;
5482         enum pevent_func_arg_type type;
5483         va_list ap;
5484         int ret;
5485 
5486         func_handle = find_func_handler(pevent, name);
5487         if (func_handle) {
5488                 /*
5489                  * This is most like caused by the users own
5490                  * plugins updating the function. This overrides the
5491                  * system defaults.
5492                  */
5493                 pr_stat("override of function helper '%s'", name);
5494                 remove_func_handler(pevent, name);
5495         }
5496 
5497         func_handle = calloc(1, sizeof(*func_handle));
5498         if (!func_handle) {
5499                 do_warning("Failed to allocate function handler");
5500                 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5501         }
5502 
5503         func_handle->ret_type = ret_type;
5504         func_handle->name = strdup(name);
5505         func_handle->func = func;
5506         if (!func_handle->name) {
5507                 do_warning("Failed to allocate function name");
5508                 free(func_handle);
5509                 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5510         }
5511 
5512         next_param = &(func_handle->params);
5513         va_start(ap, name);
5514         for (;;) {
5515                 type = va_arg(ap, enum pevent_func_arg_type);
5516                 if (type == PEVENT_FUNC_ARG_VOID)
5517                         break;
5518 
5519                 if (type >= PEVENT_FUNC_ARG_MAX_TYPES) {
5520                         do_warning("Invalid argument type %d", type);
5521                         ret = PEVENT_ERRNO__INVALID_ARG_TYPE;
5522                         goto out_free;
5523                 }
5524 
5525                 param = malloc(sizeof(*param));
5526                 if (!param) {
5527                         do_warning("Failed to allocate function param");
5528                         ret = PEVENT_ERRNO__MEM_ALLOC_FAILED;
5529                         goto out_free;
5530                 }
5531                 param->type = type;
5532                 param->next = NULL;
5533 
5534                 *next_param = param;
5535                 next_param = &(param->next);
5536 
5537                 func_handle->nr_args++;
5538         }
5539         va_end(ap);
5540 
5541         func_handle->next = pevent->func_handlers;
5542         pevent->func_handlers = func_handle;
5543 
5544         return 0;
5545  out_free:
5546         va_end(ap);
5547         free_func_handle(func_handle);
5548         return ret;
5549 }
5550 
5551 /**
5552  * pevent_register_event_handler - register a way to parse an event
5553  * @pevent: the handle to the pevent
5554  * @id: the id of the event to register
5555  * @sys_name: the system name the event belongs to
5556  * @event_name: the name of the event
5557  * @func: the function to call to parse the event information
5558  * @context: the data to be passed to @func
5559  *
5560  * This function allows a developer to override the parsing of
5561  * a given event. If for some reason the default print format
5562  * is not sufficient, this function will register a function
5563  * for an event to be used to parse the data instead.
5564  *
5565  * If @id is >= 0, then it is used to find the event.
5566  * else @sys_name and @event_name are used.
5567  */
5568 int pevent_register_event_handler(struct pevent *pevent, int id,
5569                                   const char *sys_name, const char *event_name,
5570                                   pevent_event_handler_func func, void *context)
5571 {
5572         struct event_format *event;
5573         struct event_handler *handle;
5574 
5575         if (id >= 0) {
5576                 /* search by id */
5577                 event = pevent_find_event(pevent, id);
5578                 if (!event)
5579                         goto not_found;
5580                 if (event_name && (strcmp(event_name, event->name) != 0))
5581                         goto not_found;
5582                 if (sys_name && (strcmp(sys_name, event->system) != 0))
5583                         goto not_found;
5584         } else {
5585                 event = pevent_find_event_by_name(pevent, sys_name, event_name);
5586                 if (!event)
5587                         goto not_found;
5588         }
5589 
5590         pr_stat("overriding event (%d) %s:%s with new print handler",
5591                 event->id, event->system, event->name);
5592 
5593         event->handler = func;
5594         event->context = context;
5595         return 0;
5596 
5597  not_found:
5598         /* Save for later use. */
5599         handle = calloc(1, sizeof(*handle));
5600         if (!handle) {
5601                 do_warning("Failed to allocate event handler");
5602                 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5603         }
5604 
5605         handle->id = id;
5606         if (event_name)
5607                 handle->event_name = strdup(event_name);
5608         if (sys_name)
5609                 handle->sys_name = strdup(sys_name);
5610 
5611         if ((event_name && !handle->event_name) ||
5612             (sys_name && !handle->sys_name)) {
5613                 do_warning("Failed to allocate event/sys name");
5614                 free((void *)handle->event_name);
5615                 free((void *)handle->sys_name);
5616                 free(handle);
5617                 return PEVENT_ERRNO__MEM_ALLOC_FAILED;
5618         }
5619 
5620         handle->func = func;
5621         handle->next = pevent->handlers;
5622         pevent->handlers = handle;
5623         handle->context = context;
5624 
5625         return -1;
5626 }
5627 
5628 /**
5629  * pevent_alloc - create a pevent handle
5630  */
5631 struct pevent *pevent_alloc(void)
5632 {
5633         struct pevent *pevent = calloc(1, sizeof(*pevent));
5634 
5635         if (pevent)
5636                 pevent->ref_count = 1;
5637 
5638         return pevent;
5639 }
5640 
5641 void pevent_ref(struct pevent *pevent)
5642 {
5643         pevent->ref_count++;
5644 }
5645 
5646 static void free_format_fields(struct format_field *field)
5647 {
5648         struct format_field *next;
5649 
5650         while (field) {
5651                 next = field->next;
5652                 free(field->type);
5653                 free(field->name);
5654                 free(field);
5655                 field = next;
5656         }
5657 }
5658 
5659 static void free_formats(struct format *format)
5660 {
5661         free_format_fields(format->common_fields);
5662         free_format_fields(format->fields);
5663 }
5664 
5665 void pevent_free_format(struct event_format *event)
5666 {
5667         free(event->name);
5668         free(event->system);
5669 
5670         free_formats(&event->format);
5671 
5672         free(event->print_fmt.format);
5673         free_args(event->print_fmt.args);
5674 
5675         free(event);
5676 }
5677 
5678 /**
5679  * pevent_free - free a pevent handle
5680  * @pevent: the pevent handle to free
5681  */
5682 void pevent_free(struct pevent *pevent)
5683 {
5684         struct <