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/*
* Stupid malloc debugger. I think I wrote something like
* this a couple of times already. Where does all the old
* source code go?
*/
#ifdef MDEBUG
#include <stdlib.h>
#include <string.h>
#include <libisns/util.h>
static void * isns_malloc_default(size_t, const char *, unsigned int);
static void * isns_calloc_default(unsigned int, size_t,
const char *, unsigned int);
static void * isns_realloc_default(void *, size_t,
const char *, unsigned int);
static char * isns_strdup_default(const char *, const char *, unsigned int);
static void isns_free_default(void *, const char *, unsigned int);
/*
* These are the function pointers used to redirect malloc and such.
*/
void * (*isns_malloc_fn)(size_t, const char *, unsigned int) = isns_malloc_default;
void * (*isns_calloc_fn)(unsigned int, size_t,
const char *, unsigned int) = isns_calloc_default;
void * (*isns_realloc_fn)(void *, size_t,
const char *, unsigned int) = isns_realloc_default;
char * (*isns_strdup_fn)(const char *, const char *, unsigned int) = isns_strdup_default;
void (*isns_free_fn)(void *, const char *, unsigned int) = isns_free_default;
#define H_MAGIC 0xfeedbeef
#define T_MAGIC 0xbadf00d
#define CHUNK_OVERHEAD (sizeof(struct m_header) + sizeof(struct m_trailer))
struct m_header {
struct isns_list h_list;
uint32_t h_magic;
size_t h_size;
const char * h_file;
unsigned int h_line;
};
struct m_trailer {
uint32_t t_magic[8];
size_t t_size;
};
static ISNS_LIST_DECLARE(m_list);
static void * m_low_addr;
static void * m_high_addr;
static int m_init = 0;
static void
__isns_check_chunk(const struct m_header *head)
{
const struct m_trailer *tail;
int i;
if ((void *) head < m_low_addr
|| (void *) head > m_high_addr) {
isns_error("%s: m_list corrupted!\n", __FUNCTION__);
abort();
}
if (head->h_magic != H_MAGIC) {
isns_error("%s: m_list item %p with bad header magic %08x\n",
__FUNCTION__, head, head->h_magic);
isns_error(" Allocated from %s:%u\n",
head->h_file, head->h_line);
abort();
}
tail = ((void *) head) + sizeof(*head) + head->h_size;
for (i = 0; i < 8; ++i) {
if (tail->t_magic[i] == T_MAGIC)
continue;
isns_error("%s: m_list item %p with bad trailer magic[%d] %08x\n",
__FUNCTION__, head, i, tail->t_magic[i]);
isns_error(" Allocated from %s:%u\n",
head->h_file, head->h_line);
abort();
}
if (tail->t_size != head->h_size) {
isns_error("%s: m_list item %p size mismatch; head=%u tail=%u\n",
__FUNCTION__, head,
head->h_size, tail->t_size);
isns_error(" Allocated from %s:%u\n",
head->h_file, head->h_line);
abort();
}
}
static void
__isns_verify_all(void)
{
struct isns_list *pos, *next;
isns_list_foreach(&m_list, pos, next) {
__isns_check_chunk(isns_list_item(struct m_header, h_list, pos));
}
}
void *
__isns_malloc(size_t size, const char *file, unsigned int line)
{
struct m_header *head;
struct m_trailer *tail;
size_t true_size;
void *ptr;
int i;
__isns_verify_all();
true_size = size + sizeof(*head) + sizeof(*tail);
isns_assert(size < true_size);
ptr = malloc(true_size);
if (!ptr)
return NULL;
if (!m_low_addr) {
m_low_addr = m_high_addr = ptr;
} else if (ptr < m_low_addr) {
m_low_addr = ptr;
} else if (ptr > m_high_addr) {
m_high_addr = ptr;
}
head = ptr;
head->h_magic = H_MAGIC;
head->h_size = size;
head->h_file = file;
head->h_line = line;
isns_list_append(&m_list, &head->h_list);
ptr += sizeof(*head);
tail = ptr + size;
for (i = 0; i < 8; ++i)
tail->t_magic[i] = T_MAGIC;
tail->t_size = size;
return ptr;
}
void *
__isns_calloc(unsigned int nele, size_t size,
const char *file, unsigned int line)
{
void *ptr;
ptr = __isns_malloc(nele * size, file, line);
if (ptr)
memset(ptr, 0, nele * size);
return ptr;
}
void *
__isns_realloc(void *old, size_t new_size,
const char *file, unsigned int line)
{
struct m_header *old_head = NULL;
void *new;
if (old) {
old_head = (old - sizeof(struct m_header));
__isns_check_chunk(old_head);
}
new = __isns_malloc(new_size, file, line);
if (new && old) {
memcpy(new, old, old_head->h_size);
isns_free_fn(old, file, line);
}
return new;
}
char *
__isns_strdup(const char *s, const char *file, unsigned int line)
{
size_t len;
char *ptr;
len = s? strlen(s) : 0;
ptr = __isns_malloc(len + 1, file, line);
if (ptr) {
memcpy(ptr, s, len);
ptr[len] = '\0';
}
return ptr;
}
void
__isns_free(void *ptr, const char *file, unsigned int line)
{
struct m_header *head;
size_t true_size;
if (ptr == NULL)
return;
head = ptr - sizeof(struct m_header);
__isns_check_chunk(head);
/*
printf("__isns_free(%u from %s:%u): freed by %s:%u\n",
head->h_size, head->h_file, head->h_line,
file, line);
*/
true_size = head->h_size + CHUNK_OVERHEAD;
isns_list_del(&head->h_list);
memset(head, 0xa5, true_size);
free(head);
__isns_verify_all();
}
/*
* Enable memory debugging
*/
static void
__isns_mdebug_init(void)
{
const char *tracefile;
tracefile = getenv("ISNS_MTRACE");
if (tracefile)
isns_error("MTRACE not yet supported\n");
if (getenv("ISNS_MDEBUG")) {
isns_malloc_fn = __isns_malloc;
isns_calloc_fn = __isns_calloc;
isns_realloc_fn = __isns_realloc;
isns_strdup_fn = __isns_strdup;
isns_free_fn = __isns_free;
isns_notice("Enabled memory debugging\n");
}
m_init = 1;
}
static inline void
isns_mdebug_init(void)
{
if (!m_init)
__isns_mdebug_init();
}
/*
* Default implementations of malloc and friends
*/
static void *
isns_malloc_default(size_t size, const char *file, unsigned int line)
{
isns_mdebug_init();
return malloc(size);
}
static void *
isns_calloc_default(unsigned int nele, size_t size,
const char *file, unsigned int line)
{
isns_mdebug_init();
return calloc(nele, size);
}
static void *
isns_realloc_default(void *old, size_t size,
const char *file, unsigned int line)
{
isns_mdebug_init();
return realloc(old, size);
}
static char *
isns_strdup_default(const char *s, const char *file, unsigned int line)
{
isns_mdebug_init();
return strdup(s);
}
static void
isns_free_default(void *ptr, const char *file, unsigned int line)
{
isns_mdebug_init();
return free(ptr);
}
#endif
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