lib/memory.c

   1 /*
   2  * Copyright (c) 2015-16  David Lamparter, for NetDEF, Inc.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <zebra.h>
  18
  19 #include <stdlib.h>
  20
  21 #include "memory.h"
  22 #include "log.h"
  23
  24 static struct memgroup *mg_first = NULL;
  25 struct memgroup **mg_insert = &mg_first;
  26
  27 DEFINE_MGROUP(LIB, "libfrr")
  28 DEFINE_MTYPE(LIB, TMP, "Temporary memory")
  29
  30 static inline void mt_count_alloc(struct memtype *mt, size_t size)
  31 {
  32         size_t oldsize;
  33
  34         atomic_fetch_add_explicit(&mt->n_alloc, 1, memory_order_relaxed);
  35
  36         oldsize = atomic_load_explicit(&mt->size, memory_order_relaxed);
  37         if (oldsize == 0)
  38                 oldsize = atomic_exchange_explicit(&mt->size, size, memory_order_relaxed);
  39         if (oldsize != 0 && oldsize != size && oldsize != SIZE_VAR)
  40                 atomic_store_explicit(&mt->size, SIZE_VAR, memory_order_relaxed);
  41 }
  42
  43 static inline void mt_count_free(struct memtype *mt)
  44 {
  45         assert(mt->n_alloc);
  46         atomic_fetch_sub_explicit(&mt->n_alloc, 1, memory_order_relaxed);
  47 }
  48
  49 static inline void *mt_checkalloc(struct memtype *mt, void *ptr, size_t size)
  50 {
  51         if (__builtin_expect(ptr == NULL, 0)) {
  52                 memory_oom(size, mt->name);
  53                 return NULL;
  54         }
  55         mt_count_alloc(mt, size);
  56         return ptr;
  57 }
  58
  59 void *qmalloc(struct memtype *mt, size_t size)
  60 {
  61         return mt_checkalloc(mt, malloc(size), size);
  62 }
  63
  64 void *qcalloc(struct memtype *mt, size_t size)
  65 {
  66         return mt_checkalloc(mt, calloc(size, 1), size);
  67 }
  68
  69 void *qrealloc(struct memtype *mt, void *ptr, size_t size)
  70 {
  71         if (ptr)
  72                 mt_count_free(mt);
  73         return mt_checkalloc(mt, ptr ? realloc(ptr, size) : malloc(size), size);
  74 }
  75
  76 void *qstrdup(struct memtype *mt, const char *str)
  77 {
  78         return mt_checkalloc(mt, strdup(str), strlen(str) + 1);
  79 }
  80
  81 void qfree(struct memtype *mt, void *ptr)
  82 {
  83         if (ptr)
  84                 mt_count_free(mt);
  85         free(ptr);
  86 }
  87
  88 int qmem_walk(qmem_walk_fn *func, void *arg)
  89 {
  90         struct memgroup *mg;
  91         struct memtype *mt;
  92         int rv;
  93
  94         for (mg = mg_first; mg; mg = mg->next) {
  95                 if ((rv = func(arg, mg, NULL)))
  96                         return rv;
  97                 for (mt = mg->types; mt; mt = mt->next)
  98                         if ((rv = func(arg, mg, mt)))
  99                                 return rv;
 100         }
 101         return 0;
 102 }
 103
 104 struct exit_dump_args {
 105         const char *prefix;
 106         int error;
 107 };
 108
 109 static int qmem_exit_walker(void *arg, struct memgroup *mg, struct memtype *mt)
 110 {
 111         struct exit_dump_args *eda = arg;
 112
 113         if (!mt) {
 114                 fprintf(stderr, "%s: showing active allocations in "
 115                                 "memory group %s\n",
 116                                 eda->prefix, mg->name);
 117
 118         } else if (mt->n_alloc) {
 119                 char size[32];
 120                 eda->error++;
 121                 snprintf(size, sizeof(size), "%10zu", mt->size);
 122                 fprintf(stderr, "%s: memstats:  %-30s: %6zu * %s\n",
 123                                 eda->prefix, mt->name, mt->n_alloc,
 124                                 mt->size == SIZE_VAR ? "(variably sized)" : size);
 125         }
 126         return 0;
 127 }
 128
 129 void log_memstats_stderr(const char *prefix)
 130 {
 131         struct exit_dump_args eda = { .prefix = prefix, .error = 0 };
 132         qmem_walk(qmem_exit_walker, &eda);
 133 }