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 void map__init(struct map *self, u64 start, u64 end, u64 pgoff,
  24                struct dso *dso)
  25 {
  26         self->start    = start;
  27         self->end      = end;
  28         self->pgoff    = pgoff;
  29         self->dso      = dso;
  30         self->map_ip   = map__map_ip;
  31         self->unmap_ip = map__unmap_ip;
  32         RB_CLEAR_NODE(&self->rb_node);
  33 }
  34
  35 struct map *map__new(struct mmap_event *event, char *cwd, int cwdlen)
  36 {
  37         struct map *self = malloc(sizeof(*self));
  38
  39         if (self != NULL) {
  40                 const char *filename = event->filename;
  41                 char newfilename[PATH_MAX];
  42                 struct dso *dso;
  43                 int anon;
  44
  45                 if (cwd) {
  46                         int n = strcommon(filename, cwd, cwdlen);
  47
  48                         if (n == cwdlen) {
  49                                 snprintf(newfilename, sizeof(newfilename),
  50                                          ".%s", filename + n);
  51                                 filename = newfilename;
  52                         }
  53                 }
  54
  55                 anon = is_anon_memory(filename);
  56
  57                 if (anon) {
  58                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
  59                         filename = newfilename;
  60                 }
  61
  62                 dso = dsos__findnew(filename);
  63                 if (dso == NULL)
  64                         goto out_delete;
  65
  66                 map__init(self, event->start, event->start + event->len,
  67                           event->pgoff, dso);
  68
  69                 if (self->dso == vdso || anon)
  70                         self->map_ip = self->unmap_ip = identity__map_ip;
  71         }
  72         return self;
  73 out_delete:
  74         free(self);
  75         return NULL;
  76 }
  77
  78 struct symbol *
  79 map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter)
  80 {
  81         if (!self->dso->loaded) {
  82                 int nr = dso__load(self->dso, self, filter);
  83
  84                 if (nr < 0) {
  85                         pr_warning("Failed to open %s, continuing without symbols\n",
  86                                    self->dso->long_name);
  87                         return NULL;
  88                 } else if (nr == 0) {
  89                         pr_warning("No symbols found in %s, maybe install a debug package?\n",
  90                                    self->dso->long_name);
  91                         return NULL;
  92                 }
  93         }
  94
  95         return self->dso->find_symbol(self->dso, ip);
  96 }
  97
  98 struct map *map__clone(struct map *self)
  99 {
 100         struct map *map = malloc(sizeof(*self));
 101
 102         if (!map)
 103                 return NULL;
 104
 105         memcpy(map, self, sizeof(*self));
 106
 107         return map;
 108 }
 109
 110 int map__overlap(struct map *l, struct map *r)
 111 {
 112         if (l->start > r->start) {
 113                 struct map *t = l;
 114                 l = r;
 115                 r = t;
 116         }
 117
 118         if (l->end > r->start)
 119                 return 1;
 120
 121         return 0;
 122 }
 123
 124 size_t map__fprintf(struct map *self, FILE *fp)
 125 {
 126         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 127                        self->start, self->end, self->pgoff, self->dso->name);
 128 }