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

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