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, enum map_type type,
  24                u64 start, u64 end, u64 pgoff, struct dso *dso)
  25 {
  26         self->type     = type;
  27         self->start    = start;
  28         self->end      = end;
  29         self->pgoff    = pgoff;
  30         self->dso      = dso;
  31         self->map_ip   = map__map_ip;
  32         self->unmap_ip = map__unmap_ip;
  33         RB_CLEAR_NODE(&self->rb_node);
  34 }
  35
  36 struct map *map__new(struct mmap_event *event, enum map_type type,
  37                      char *cwd, int cwdlen)
  38 {
  39         struct map *self = malloc(sizeof(*self));
  40
  41         if (self != NULL) {
  42                 const char *filename = event->filename;
  43                 char newfilename[PATH_MAX];
  44                 struct dso *dso;
  45                 int anon;
  46
  47                 if (cwd) {
  48                         int n = strcommon(filename, cwd, cwdlen);
  49
  50                         if (n == cwdlen) {
  51                                 snprintf(newfilename, sizeof(newfilename),
  52                                          ".%s", filename + n);
  53                                 filename = newfilename;
  54                         }
  55                 }
  56
  57                 anon = is_anon_memory(filename);
  58
  59                 if (anon) {
  60                         snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", event->pid);
  61                         filename = newfilename;
  62                 }
  63
  64                 dso = dsos__findnew(filename);
  65                 if (dso == NULL)
  66                         goto out_delete;
  67
  68                 map__init(self, type, event->start, event->start + event->len,
  69                           event->pgoff, dso);
  70
  71                 if (self->dso == vdso || anon)
  72                         self->map_ip = self->unmap_ip = identity__map_ip;
  73         }
  74         return self;
  75 out_delete:
  76         free(self);
  77         return NULL;
  78 }
  79
  80 void map__delete(struct map *self)
  81 {
  82         free(self);
  83 }
  84
  85 void map__fixup_start(struct map *self)
  86 {
  87         struct rb_root *symbols = &self->dso->symbols[self->type];
  88         struct rb_node *nd = rb_first(symbols);
  89         if (nd != NULL) {
  90                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
  91                 self->start = sym->start;
  92         }
  93 }
  94
  95 void map__fixup_end(struct map *self)
  96 {
  97         struct rb_root *symbols = &self->dso->symbols[self->type];
  98         struct rb_node *nd = rb_last(symbols);
  99         if (nd != NULL) {
 100                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
 101                 self->end = sym->end;
 102         }
 103 }
 104
 105 #define DSO__DELETED "(deleted)"
 106
 107 struct symbol *map__find_symbol(struct map *self, u64 addr,
 108                                 symbol_filter_t filter)
 109 {
 110         if (!dso__loaded(self->dso, self->type)) {
 111                 int nr = dso__load(self->dso, self, filter);
 112
 113                 if (nr < 0) {
 114                         if (self->dso->has_build_id) {
 115                                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 116
 117                                 build_id__sprintf(self->dso->build_id,
 118                                                   sizeof(self->dso->build_id),
 119                                                   sbuild_id);
 120                                 pr_warning("%s with build id %s not found",
 121                                            self->dso->long_name, sbuild_id);
 122                         } else
 123                                 pr_warning("Failed to open %s",
 124                                            self->dso->long_name);
 125                         pr_warning(", continuing without symbols\n");
 126                         return NULL;
 127                 } else if (nr == 0) {
 128                         const char *name = self->dso->long_name;
 129                         const size_t len = strlen(name);
 130                         const size_t real_len = len - sizeof(DSO__DELETED);
 131
 132                         if (len > sizeof(DSO__DELETED) &&
 133                             strcmp(name + real_len + 1, DSO__DELETED) == 0) {
 134                                 pr_warning("%.*s was updated, restart the long running apps that use it!\n",
 135                                            (int)real_len, name);
 136                         } else {
 137                                 pr_warning("no symbols found in %s, maybe install a debug package?\n", name);
 138                         }
 139                         return NULL;
 140                 }
 141         }
 142
 143         return self->dso->find_symbol(self->dso, self->type, addr);
 144 }
 145
 146 struct map *map__clone(struct map *self)
 147 {
 148         struct map *map = malloc(sizeof(*self));
 149
 150         if (!map)
 151                 return NULL;
 152
 153         memcpy(map, self, sizeof(*self));
 154
 155         return map;
 156 }
 157
 158 int map__overlap(struct map *l, struct map *r)
 159 {
 160         if (l->start > r->start) {
 161                 struct map *t = l;
 162                 l = r;
 163                 r = t;
 164         }
 165
 166         if (l->end > r->start)
 167                 return 1;
 168
 169         return 0;
 170 }
 171
 172 size_t map__fprintf(struct map *self, FILE *fp)
 173 {
 174         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 175                        self->start, self->end, self->pgoff, self->dso->name);
 176 }