tools/perf/util/parse-regs-options.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "perf.h"
   3 #include "util/util.h"
   4 #include "util/debug.h"
   5 #include <subcmd/parse-options.h>
   6 #include "util/parse-regs-options.h"
   7
   8 int
   9 parse_regs(const struct option *opt, const char *str, int unset)
  10 {
  11         uint64_t *mode = (uint64_t *)opt->value;
  12         const struct sample_reg *r;
  13         char *s, *os = NULL, *p;
  14         int ret = -1;
  15
  16         if (unset)
  17                 return 0;
  18
  19         /*
  20          * cannot set it twice
  21          */
  22         if (*mode)
  23                 return -1;
  24
  25         /* str may be NULL in case no arg is passed to -I */
  26         if (str) {
  27                 /* because str is read-only */
  28                 s = os = strdup(str);
  29                 if (!s)
  30                         return -1;
  31
  32                 for (;;) {
  33                         p = strchr(s, ',');
  34                         if (p)
  35                                 *p = '\0';
  36
  37                         if (!strcmp(s, "?")) {
  38                                 fprintf(stderr, "available registers: ");
  39                                 for (r = sample_reg_masks; r->name; r++) {
  40                                         fprintf(stderr, "%s ", r->name);
  41                                 }
  42                                 fputc('\n', stderr);
  43                                 /* just printing available regs */
  44                                 goto error;
  45                         }
  46                         for (r = sample_reg_masks; r->name; r++) {
  47                                 if (!strcasecmp(s, r->name))
  48                                         break;
  49                         }
  50                         if (!r->name) {
  51                                 ui__warning("unknown register %s,"
  52                                             " check man page\n", s);
  53                                 goto error;
  54                         }
  55
  56                         *mode |= r->mask;
  57
  58                         if (!p)
  59                                 break;
  60
  61                         s = p + 1;
  62                 }
  63         }
  64         ret = 0;
  65
  66         /* default to all possible regs */
  67         if (*mode == 0)
  68                 *mode = PERF_REGS_MASK;
  69 error:
  70         free(os);
  71         return ret;
  72 }