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 void map__delete(struct map *self)
  79 {
  80         free(self);
  81 }
  82
  83 void map__fixup_start(struct map *self, struct rb_root *symbols)
  84 {
  85         struct rb_node *nd = rb_first(symbols);
  86         if (nd != NULL) {
  87                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
  88                 self->start = sym->start;
  89         }
  90 }
  91
  92 void map__fixup_end(struct map *self, struct rb_root *symbols)
  93 {
  94         struct rb_node *nd = rb_last(symbols);
  95         if (nd != NULL) {
  96                 struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
  97                 self->end = sym->end;
  98         }
  99 }
 100
 101 #define DSO__DELETED "(deleted)"
 102
 103 struct symbol *map__find_function(struct map *self, u64 ip,
 104                                   symbol_filter_t filter)
 105 {
 106         if (!self->dso->loaded) {
 107                 int nr = dso__load(self->dso, self, filter);
 108
 109                 if (nr < 0) {
 110                         if (self->dso->has_build_id) {
 111                                 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
 112
 113                                 build_id__sprintf(self->dso->build_id,
 114                                                   sizeof(self->dso->build_id),
 115                                                   sbuild_id);
 116                                 pr_warning("%s with build id %s not found",
 117                                            self->dso->long_name, sbuild_id);
 118                         } else
 119                                 pr_warning("Failed to open %s",
 120                                            self->dso->long_name);
 121                         pr_warning(", continuing without symbols\n");
 122                         return NULL;
 123                 } else if (nr == 0) {
 124                         const char *name = self->dso->long_name;
 125                         const size_t len = strlen(name);
 126                         const size_t real_len = len - sizeof(DSO__DELETED);
 127
 128                         if (len > sizeof(DSO__DELETED) &&
 129                             strcmp(name + real_len + 1, DSO__DELETED) == 0) {
 130                                 pr_warning("%.*s was updated, restart the long running apps that use it!\n",
 131                                            (int)real_len, name);
 132                         } else {
 133                                 pr_warning("no symbols found in %s, maybe install a debug package?\n", name);
 134                         }
 135                         return NULL;
 136                 }
 137         }
 138
 139         return self->dso->find_function(self->dso, ip);
 140 }
 141
 142 struct map *map__clone(struct map *self)
 143 {
 144         struct map *map = malloc(sizeof(*self));
 145
 146         if (!map)
 147                 return NULL;
 148
 149         memcpy(map, self, sizeof(*self));
 150
 151         return map;
 152 }
 153
 154 int map__overlap(struct map *l, struct map *r)
 155 {
 156         if (l->start > r->start) {
 157                 struct map *t = l;
 158                 l = r;
 159                 r = t;
 160         }
 161
 162         if (l->end > r->start)
 163                 return 1;
 164
 165         return 0;
 166 }
 167
 168 size_t map__fprintf(struct map *self, FILE *fp)
 169 {
 170         return fprintf(fp, " %Lx-%Lx %Lx %s\n",
 171                        self->start, self->end, self->pgoff, self->dso->name);
 172 }