Pileus Git - ~andy/linux/blob - 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 #define DSO__DELETED "(deleted)"
  79
  80 struct symbol *
  81 map__find_symbol(struct map *self, u64 ip, symbol_filter_t filter)
  82 {
  83         if (!self->dso->loaded) {
  84                 int nr = dso__load(self->dso, self, filter);
  85
  86                 if (nr < 0) {
  87                         pr_warning("Failed to open %s, continuing without symbols\n",
  88                                    self->dso->long_name);
  89                         return NULL;
  90                 } else if (nr == 0) {
  91                         const char *name = self->dso->long_name;
  92                         const size_t len = strlen(name);
  93                         const size_t real_len = len - sizeof(DSO__DELETED);
  94
  95                         if (len > sizeof(DSO__DELETED) &&
  96                             strcmp(name + real_len + 1, DSO__DELETED) == 0) {
  97                                 pr_warning("%.*s was updated, restart the long running apps that use it!\n",
  98                                            (int)real_len, name);
  99                         } else {
 100                                 pr_warning("no symbols found in %s, maybe install a debug package?\n", name);
 101                         }
 102                         return NULL;
 103                 }
 104         }
 105
 106         return self->dso->find_symbol(self->dso, ip);
 107 }
 108
 109 struct map *map__clone(struct map *self)
 110 {
 111         struct map *map = malloc(sizeof(*self));
 112
 113         if (!map)
 114                 return NULL;
 115
 116         memcpy(map, self, sizeof(*self));
 117
 118         return map;
 119 }
 120
 121 int map__overlap(struct map *l, struct map *r)
 122 {
 123         if (l->start > r->start) {
 124                 struct map *t = l;
 125                 l = r;
 126                 r = t;
 127         }
 128
 129         if (l->end > r->start)
 130                 return 1;
 131
 132         return 0;
 133 }
 134
 135 size_t map__fprintf(struct map *self, FILE *fp)
 136 {
 137         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 138                        self->start, self->end, self->pgoff, self->dso->name);
 139 }