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)
  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
  33                 if (cwd) {
  34                         int n = strcommon(filename, cwd, cwdlen);
  35
  36                         if (n == cwdlen) {
  37                                 snprintf(newfilename, sizeof(newfilename),
  38                                          ".%s", filename + n);
  39                                 filename = newfilename;
  40                         }
  41                 }
  42
  43                 anon = is_anon_memory(filename);
  44
  45                 if (anon) {
  46                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
  47                         filename = newfilename;
  48                 }
  49
  50                 self->start = event->start;
  51                 self->end   = event->start + event->len;
  52                 self->pgoff = event->pgoff;
  53
  54                 self->dso = dsos__findnew(filename, sym_priv_size);
  55                 if (self->dso == NULL)
  56                         goto out_delete;
  57
  58                 if (self->dso == vdso || anon)
  59                         self->map_ip = self->unmap_ip = identity__map_ip;
  60                 else {
  61                         self->map_ip = map__map_ip;
  62                         self->unmap_ip = map__unmap_ip;
  63                 }
  64         }
  65         return self;
  66 out_delete:
  67         free(self);
  68         return NULL;
  69 }
  70
  71 struct symbol *
  72 map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter)
  73 {
  74         if (!self->dso->loaded) {
  75                 int nr = dso__load(self->dso, self, filter);
  76
  77                 if (nr < 0) {
  78                         pr_warning("Failed to open %s, continuing without symbols\n",
  79                                    self->dso->long_name);
  80                         return NULL;
  81                 } else if (nr == 0) {
  82                         pr_warning("No symbols found in %s, maybe install a debug package?\n",
  83                                    self->dso->long_name);
  84                         return NULL;
  85                 }
  86         }
  87
  88         return self->dso->find_symbol(self->dso, ip);
  89 }
  90
  91 struct map *map__clone(struct map *self)
  92 {
  93         struct map *map = malloc(sizeof(*self));
  94
  95         if (!map)
  96                 return NULL;
  97
  98         memcpy(map, self, sizeof(*self));
  99
 100         return map;
 101 }
 102
 103 int map__overlap(struct map *l, struct map *r)
 104 {
 105         if (l->start > r->start) {
 106                 struct map *t = l;
 107                 l = r;
 108                 r = t;
 109         }
 110
 111         if (l->end > r->start)
 112                 return 1;
 113
 114         return 0;
 115 }
 116
 117 size_t map__fprintf(struct map *self, FILE *fp)
 118 {
 119         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 120                        self->start, self->end, self->pgoff, self->dso->name);
 121 }