tools/perf/util/map.c

   1 #include "event.h"
   2 #include "symbol.h"
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <stdio.h>
   6
   7 static inline int is_anon_memory(const char *filename)
   8 {
   9         return strcmp(filename, "//anon") == 0;
  10 }
  11
  12 static int strcommon(const char *pathname, char *cwd, int cwdlen)
  13 {
  14         int n = 0;
  15
  16         while (n < cwdlen && pathname[n] == cwd[n])
  17                 ++n;
  18
  19         return n;
  20 }
  21
  22  struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen)
  23 {
  24         struct map *self = malloc(sizeof(*self));
  25
  26         if (self != NULL) {
  27                 const char *filename = event->filename;
  28                 char newfilename[PATH_MAX];
  29                 int anon;
  30
  31                 if (cwd) {
  32                         int n = strcommon(filename, cwd, cwdlen);
  33
  34                         if (n == cwdlen) {
  35                                 snprintf(newfilename, sizeof(newfilename),
  36                                          ".%s", filename + n);
  37                                 filename = newfilename;
  38                         }
  39                 }
  40
  41                 anon = is_anon_memory(filename);
  42
  43                 if (anon) {
  44                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
  45                         filename = newfilename;
  46                 }
  47
  48                 self->start = event->start;
  49                 self->end   = event->start + event->len;
  50                 self->pgoff = event->pgoff;
  51
  52                 self->dso = dsos__findnew(filename);
  53                 if (self->dso == NULL)
  54                         goto out_delete;
  55
  56                 if (self->dso == vdso || anon)
  57                         self->map_ip = vdso__map_ip;
  58                 else
  59                         self->map_ip = map__map_ip;
  60         }
  61         return self;
  62 out_delete:
  63         free(self);
  64         return NULL;
  65 }
  66
  67 struct map *map__clone(struct map *self)
  68 {
  69         struct map *map = malloc(sizeof(*self));
  70
  71         if (!map)
  72                 return NULL;
  73
  74         memcpy(map, self, sizeof(*self));
  75
  76         return map;
  77 }
  78
  79 int map__overlap(struct map *l, struct map *r)
  80 {
  81         if (l->start > r->start) {
  82                 struct map *t = l;
  83                 l = r;
  84                 r = t;
  85         }
  86
  87         if (l->end > r->start)
  88                 return 1;
  89
  90         return 0;
  91 }
  92
  93 size_t map__fprintf(struct map *self, FILE *fp)
  94 {
  95         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
  96                        self->start, self->end, self->pgoff, self->dso->name);
  97 }