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#include "dbmalloc.h"
#include "dbutil.h"
struct dbmalloc_header {
unsigned int epoch;
struct dbmalloc_header *prev;
struct dbmalloc_header *next;
};
static void put_alloc(struct dbmalloc_header *header);
static void remove_alloc(struct dbmalloc_header *header);
/* end of the linked list */
static struct dbmalloc_header* staple;
unsigned int current_epoch = 0;
void m_malloc_set_epoch(unsigned int epoch) {
current_epoch = epoch;
}
void m_malloc_free_epoch(unsigned int epoch, int dofree) {
struct dbmalloc_header* header;
struct dbmalloc_header* nextheader = NULL;
struct dbmalloc_header* oldstaple = staple;
staple = NULL;
/* free allocations from this epoch, create a new staple-anchored list from
the remainder */
for (header = oldstaple; header; header = nextheader)
{
nextheader = header->next;
if (header->epoch == epoch) {
if (dofree) {
free(header);
}
} else {
header->prev = NULL;
header->next = NULL;
put_alloc(header);
}
}
}
static void put_alloc(struct dbmalloc_header *header) {
assert(header->next == NULL);
assert(header->prev == NULL);
if (staple) {
staple->prev = header;
}
header->next = staple;
staple = header;
}
static void remove_alloc(struct dbmalloc_header *header) {
if (header->prev) {
header->prev->next = header->next;
}
if (header->next) {
header->next->prev = header->prev;
}
if (staple == header) {
staple = header->next;
}
header->prev = NULL;
header->next = NULL;
}
static struct dbmalloc_header* get_header(void* ptr) {
char* bptr = ptr;
return (struct dbmalloc_header*)&bptr[-sizeof(struct dbmalloc_header)];
}
void * m_malloc(size_t size) {
char* mem = NULL;
struct dbmalloc_header* header = NULL;
if (size == 0 || size > 1e9) {
dropbear_exit("m_malloc failed");
}
size = size + sizeof(struct dbmalloc_header);
mem = calloc(1, size);
if (mem == NULL) {
dropbear_exit("m_malloc failed");
}
header = (struct dbmalloc_header*)mem;
put_alloc(header);
header->epoch = current_epoch;
return &mem[sizeof(struct dbmalloc_header)];
}
void * m_calloc(size_t nmemb, size_t size) {
if (SIZE_T_MAX / nmemb < size) {
dropbear_exit("m_calloc failed");
}
return m_malloc(nmemb*size);
}
void * m_realloc(void* ptr, size_t size) {
char* mem = NULL;
struct dbmalloc_header* header = NULL;
if (size == 0 || size > 1e9) {
dropbear_exit("m_realloc failed");
}
header = get_header(ptr);
remove_alloc(header);
size = size + sizeof(struct dbmalloc_header);
mem = realloc(header, size);
if (mem == NULL) {
dropbear_exit("m_realloc failed");
}
header = (struct dbmalloc_header*)mem;
put_alloc(header);
return &mem[sizeof(struct dbmalloc_header)];
}
void m_free_direct(void* ptr) {
struct dbmalloc_header* header = NULL;
if (!ptr) {
return;
}
header = get_header(ptr);
remove_alloc(header);
free(header);
}
void * m_strdup(const char * str) {
char* ret;
unsigned int len;
len = strlen(str);
ret = m_malloc(len+1);
if (ret == NULL) {
dropbear_exit("m_strdup failed");
}
memcpy(ret, str, len+1);
return ret;
}
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