tools/perf/util/comm.c

   1 #include "comm.h"
   2 #include "util.h"
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5
   6 struct comm_str {
   7         char *str;
   8         struct rb_node rb_node;
   9         int ref;
  10 };
  11
  12 /* Should perhaps be moved to struct machine */
  13 static struct rb_root comm_str_root;
  14
  15 static void comm_str__get(struct comm_str *cs)
  16 {
  17         cs->ref++;
  18 }
  19
  20 static void comm_str__put(struct comm_str *cs)
  21 {
  22         if (!--cs->ref) {
  23                 rb_erase(&cs->rb_node, &comm_str_root);
  24                 zfree(&cs->str);
  25                 free(cs);
  26         }
  27 }
  28
  29 static struct comm_str *comm_str__alloc(const char *str)
  30 {
  31         struct comm_str *cs;
  32
  33         cs = zalloc(sizeof(*cs));
  34         if (!cs)
  35                 return NULL;
  36
  37         cs->str = strdup(str);
  38         if (!cs->str) {
  39                 free(cs);
  40                 return NULL;
  41         }
  42
  43         return cs;
  44 }
  45
  46 static struct comm_str *comm_str__findnew(const char *str, struct rb_root *root)
  47 {
  48         struct rb_node **p = &root->rb_node;
  49         struct rb_node *parent = NULL;
  50         struct comm_str *iter, *new;
  51         int cmp;
  52
  53         while (*p != NULL) {
  54                 parent = *p;
  55                 iter = rb_entry(parent, struct comm_str, rb_node);
  56
  57                 cmp = strcmp(str, iter->str);
  58                 if (!cmp)
  59                         return iter;
  60
  61                 if (cmp < 0)
  62                         p = &(*p)->rb_left;
  63                 else
  64                         p = &(*p)->rb_right;
  65         }
  66
  67         new = comm_str__alloc(str);
  68         if (!new)
  69                 return NULL;
  70
  71         rb_link_node(&new->rb_node, parent, p);
  72         rb_insert_color(&new->rb_node, root);
  73
  74         return new;
  75 }
  76
  77 struct comm *comm__new(const char *str, u64 timestamp)
  78 {
  79         struct comm *comm = zalloc(sizeof(*comm));
  80
  81         if (!comm)
  82                 return NULL;
  83
  84         comm->start = timestamp;
  85
  86         comm->comm_str = comm_str__findnew(str, &comm_str_root);
  87         if (!comm->comm_str) {
  88                 free(comm);
  89                 return NULL;
  90         }
  91
  92         comm_str__get(comm->comm_str);
  93
  94         return comm;
  95 }
  96
  97 int comm__override(struct comm *comm, const char *str, u64 timestamp)
  98 {
  99         struct comm_str *new, *old = comm->comm_str;
 100
 101         new = comm_str__findnew(str, &comm_str_root);
 102         if (!new)
 103                 return -ENOMEM;
 104
 105         comm_str__get(new);
 106         comm_str__put(old);
 107         comm->comm_str = new;
 108         comm->start = timestamp;
 109
 110         return 0;
 111 }
 112
 113 void comm__free(struct comm *comm)
 114 {
 115         comm_str__put(comm->comm_str);
 116         free(comm);
 117 }
 118
 119 const char *comm__str(const struct comm *comm)
 120 {
 121         return comm->comm_str->str;
 122 }