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 #include "debug.h"
   7
   8 static inline int is_anon_memory(const char *filename)
   9 {
  10         return strcmp(filename, "//anon") == 0;
  11 }
  12
  13 static int strcommon(const char *pathname, char *cwd, int cwdlen)
  14 {
  15         int n = 0;
  16
  17         while (n < cwdlen && pathname[n] == cwd[n])
  18                 ++n;
  19
  20         return n;
  21 }
  22
  23 struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen,
  24                      unsigned int sym_priv_size, symbol_filter_t filter)
  25 {
  26         struct map *self = malloc(sizeof(*self));
  27
  28         if (self != NULL) {
  29                 const char *filename = event->filename;
  30                 char newfilename[PATH_MAX];
  31                 int anon;
  32                 bool new_dso;
  33
  34                 if (cwd) {
  35                         int n = strcommon(filename, cwd, cwdlen);
  36
  37                         if (n == cwdlen) {
  38                                 snprintf(newfilename, sizeof(newfilename),
  39                                          ".%s", filename + n);
  40                                 filename = newfilename;
  41                         }
  42                 }
  43
  44                 anon = is_anon_memory(filename);
  45
  46                 if (anon) {
  47                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
  48                         filename = newfilename;
  49                 }
  50
  51                 self->start = event->start;
  52                 self->end   = event->start + event->len;
  53                 self->pgoff = event->pgoff;
  54
  55                 self->dso = dsos__findnew(filename, sym_priv_size, &new_dso);
  56                 if (self->dso == NULL)
  57                         goto out_delete;
  58
  59                 if (new_dso) {
  60                         int nr = dso__load(self->dso, self, filter);
  61
  62                         if (nr < 0)
  63                                 pr_warning("Failed to open %s, continuing "
  64                                            "without symbols\n",
  65                                            self->dso->long_name);
  66                         else if (nr == 0)
  67                                 pr_warning("No symbols found in %s, maybe "
  68                                            "install a debug package?\n",
  69                                            self->dso->long_name);
  70                 }
  71
  72                 if (self->dso == vdso || anon)
  73                         self->map_ip = self->unmap_ip = identity__map_ip;
  74                 else {
  75                         self->map_ip = map__map_ip;
  76                         self->unmap_ip = map__unmap_ip;
  77                 }
  78         }
  79         return self;
  80 out_delete:
  81         free(self);
  82         return NULL;
  83 }
  84
  85 struct map *map__clone(struct map *self)
  86 {
  87         struct map *map = malloc(sizeof(*self));
  88
  89         if (!map)
  90                 return NULL;
  91
  92         memcpy(map, self, sizeof(*self));
  93
  94         return map;
  95 }
  96
  97 int map__overlap(struct map *l, struct map *r)
  98 {
  99         if (l->start > r->start) {
 100                 struct map *t = l;
 101                 l = r;
 102                 r = t;
 103         }
 104
 105         if (l->end > r->start)
 106                 return 1;
 107
 108         return 0;
 109 }
 110
 111 size_t map__fprintf(struct map *self, FILE *fp)
 112 {
 113         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 114                        self->start, self->end, self->pgoff, self->dso->name);
 115 }