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#undef MEMDEBUG
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <limits.h>
#include <signal.h>
#include "spinlock.h"
#include "list.h"
#define __init __attribute__((constructor))
#define __export __attribute__((visibility("default")))
#undef offsetof
#ifdef __compiler_offsetof
#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#define MAGIC1 0x1122334455667788llu
struct mem_t
{
struct list_head entry;
const char *fname;
int line;
size_t size;
uint64_t magic2;
uint64_t magic1;
char data[0];
};
static LIST_HEAD(mem_list);
static spinlock_t mem_list_lock = SPINLOCK_INITIALIZER;
struct mem_t *_md_malloc(size_t size, const char *fname, int line)
{
struct mem_t *mem = malloc(sizeof(*mem) + size + 8);
if (size > 4096)
line = 0;
mem->fname = fname;
mem->line = line;
mem->size = size;
mem->magic1 = MAGIC1;
mem->magic2 = (uint64_t)random() * (uint64_t)random();
*(uint64_t*)(mem->data + size) = mem->magic2;
spin_lock(&mem_list_lock);
list_add_tail(&mem->entry, &mem_list);
spin_unlock(&mem_list_lock);
return mem;
}
void __export *md_malloc(size_t size, const char *fname, int line)
{
struct mem_t *mem = _md_malloc(size, fname, line);
return mem->data;
}
void __export md_free(void *ptr, const char *fname, int line)
{
struct mem_t *mem = container_of(ptr, typeof(*mem), data);
if (!ptr) {
printf("free null pointer at %s:%i\n", fname, line);
abort();
}
if (mem->magic1 != MAGIC1) {
printf("memory corruption:\nfree at %s:%i\n", fname, line);
abort();
}
if (mem->magic2 != *(uint64_t*)(mem->data + mem->size)) {
printf("memory corruption:\nmalloc(%lu) at %s:%i\nfree at %s:%i\n", (long unsigned)mem->size, mem->fname, mem->line, fname, line);
abort();
}
mem->magic1 = 0;
mem->magic2 = 0;
spin_lock(&mem_list_lock);
list_del(&mem->entry);
spin_unlock(&mem_list_lock);
free(mem);
return;
}
void __export *md_realloc(void *ptr, size_t size, const char *fname, int line)
{
struct mem_t *mem = container_of(ptr, typeof(*mem), data);
struct mem_t *mem2;
if (mem->magic1 != MAGIC1) {
printf("memory corruption:\nfree at %s:%i\n", fname, line);
abort();
}
if (mem->magic2 != *(uint64_t*)(mem->data + mem->size)) {
printf("memory corruption:\nmalloc(%lu) at %s:%i\nfree at %s:%i\n", (long unsigned)mem->size, mem->fname, mem->line, fname, line);
abort();
}
mem2 = _md_malloc(size, fname, line);
memcpy(mem2->data, mem->data, mem->size);
md_free(mem->data, fname, line);
return mem2->data;
}
char __export *md_strdup(const char *ptr, const char *fname, int line)
{
struct mem_t *mem = _md_malloc(strlen(ptr) + 1, fname, line);
memcpy(mem->data, ptr, strlen(ptr) + 1);
return mem->data;
}
char __export *md_strndup(const char *ptr, size_t n, const char *fname, int line)
{
struct mem_t *mem = _md_malloc(n + 1, fname, line);
memcpy(mem->data, ptr, n);
mem->data[n] = 0;
return mem->data;
}
static void siginfo(int num)
{
struct mem_t *mem;
size_t total = 0;
spin_lock(&mem_list_lock);
list_for_each_entry(mem, &mem_list, entry) {
printf("%s:%i %lu\n", mem->fname, mem->line, (long unsigned)mem->size);
total += mem->size;
}
spin_unlock(&mem_list_lock);
printf("total = %lu\n", (long unsigned)total);
}
static void siginfo2(int num)
{
struct mem_t *mem;
spin_lock(&mem_list_lock);
list_for_each_entry(mem, &mem_list, entry) {
if (mem->magic1 != MAGIC1 || mem->magic2 != *(uint64_t*)(mem->data + mem->size))
printf("%s:%i %lu\n", mem->fname, mem->line, (long unsigned)mem->size);
}
spin_unlock(&mem_list_lock);
}
void __export md_check(void *ptr)
{
struct mem_t *mem = container_of(ptr, typeof(*mem), data);
if (!ptr)
abort();
if (mem->magic1 != MAGIC1)
abort();
if (mem->magic2 != *(uint64_t*)(mem->data + mem->size))
abort();
}
static void __init init(void)
{
signal(36, siginfo);
signal(37, siginfo2);
}
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