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 } 123