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#include "dbmalloc.h"
#include "dbutil.h"
#define LIST_SIZE 1000
struct dbmalloc_header {
unsigned int index;
unsigned int epoch;
};
static struct dbmalloc_header* dbmalloc_list[LIST_SIZE];
unsigned int current_epoch = 0;
void m_malloc_set_epoch(unsigned int epoch) {
current_epoch = epoch;
}
void m_malloc_free_epoch(unsigned int epoch) {
unsigned int i;
unsigned int freed = 0;
for (i = 0; i < LIST_SIZE; i++) {
if (dbmalloc_list[i] != NULL) {
assert(dbmalloc_list[i]->index == i);
if (dbmalloc_list[i]->epoch == epoch) {
free(dbmalloc_list[i]);
dbmalloc_list[i] = NULL;
freed++;
}
}
}
TRACE(("free_epoch freed %d", freed))
}
static void put_alloc(struct dbmalloc_header *header) {
unsigned int i;
for (i = 0; i < LIST_SIZE; i++) {
if (dbmalloc_list[i] == NULL) {
dbmalloc_list[i] = header;
header->index = i;
return;
}
}
dropbear_exit("ran out of dbmalloc entries");
}
static void remove_alloc(struct dbmalloc_header *header) {
assert(header->index < LIST_SIZE);
assert(dbmalloc_list[header->index] == header);
assert(header->epoch == current_epoch);
dbmalloc_list[header->index] = 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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