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#ifndef ZONE_H
#define ZONE_H
#include <stdint.h>
#include <stddef.h>
#ifndef ZONE_BACKEND
#ifdef __unix__
#define ZONE_BACKEND ZONE_USE_MMAP
#else
#define ZONE_BACKEND ZONE_USE_MALLOC
#endif
#endif
#define ZONE_USE_MALLOC 0
#define ZONE_USE_MMAP 1
typedef struct ZoneFrame ZoneFrame;
struct ZoneFrame {
ZoneFrame *prev, *next;
uint8_t *beg, *end;
uint8_t data[];
};
typedef struct {
ZoneFrame *cur, *tail;
} Zone;
typedef struct {
ZoneFrame *zf;
uint8_t *beg;
} ZoneState;
void zn_free(Zone *z);
void zn_reset(Zone *z);
void zn_save(Zone *z, ZoneState *m);
void zn_load(Zone *z, ZoneState *m);
void *zn_alloc(Zone *z, ptrdiff_t n);
void *zn_alloc_align(Zone *z, ptrdiff_t n, size_t align);
void *zn_realloc(Zone *z, void *ptr, ptrdiff_t oldsz, ptrdiff_t newsz);
void *zn_realloc_align(Zone *z, void *ptr, ptrdiff_t oldsz, ptrdiff_t newsz, size_t align);
char *zn_strdup(Zone *z, const char *s);
void *zn_zeroed(void *, size_t);
#define zn_new(z, t) (t*)zn_zeroed(zn_alloc_align(z, sizeof(t), alignof(t)), sizeof(t))
#ifdef ZONE_IMPL
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zone.h"
#ifndef ZONE_PAGE_MULT
#define ZONE_PAGE_MULT 2
#endif
#if ZONE_BACKEND == ZONE_USE_MMAP
#include <sys/mman.h>
#include <unistd.h>
#define ZONE_PAGE_SIZE (ZONE_PAGE_MULT * sysconf(_SC_PAGE_SIZE))
static void *zn_pg_alloc(size_t n) {
return mmap(NULL, n * ZONE_PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
}
static void zn_pg_free(void *p, size_t n) {
munmap(p, n);
}
#elif ZONE_BACKEND == ZONE_USE_MALLOC
#define ZONE_PAGE_SIZE (ZONE_PAGE_MULT * 4 * 1024)
static void zn_pg_alloc(size_t n) {
eturn malloc(n * ZONE_PAGE_SIZE);
}
static void zn_pg_free(void *p, size_t n) {
free(p);
}
#else
#error "unknown or unsupported zone backend"
#endif
static inline size_t zn_pg_fit(size_t cap) {
return cap + (-cap & (ZONE_PAGE_SIZE - 1));
}
static ZoneFrame *zn_zf_new(size_t capacity) {
ZoneFrame *zf = zn_pg_alloc(capacity / ZONE_PAGE_SIZE);
zf->prev = NULL;
zf->next = NULL;
zf->beg = zf->data;
zf->end = (uint8_t*)zf + capacity;
return zf;
}
static void zn_zf_free(ZoneFrame *z) {
zn_pg_free(z, (uintptr_t)z->end - (uintptr_t)z->beg);
}
#define PTR_ALIGN(ptr, align) (typeof(ptr))((uint8_t*)ptr + ((-(uintptr_t)ptr) & ((align)-1)))
void *zn_alloc_align(Zone *z, ptrdiff_t n, size_t align) {
ZoneFrame *zf = z->cur;
while (zf && PTR_ALIGN(zf->beg, align) + n >= zf->end) {
zf = zf->next;
}
if (!zf) {
zf = zn_zf_new(zn_pg_fit(n + sizeof(ZoneFrame) + align - 1));
zf->prev = z->tail;
if (z->tail) z->tail->next = zf;
z->tail = zf;
z->cur = zf;
}
zf->beg = PTR_ALIGN(zf->beg, align);
void *p = zf->beg;
zf->beg += n;
return p;
}
void *zn_realloc_align(Zone *z, void *ptr, ptrdiff_t oldsz, ptrdiff_t newsz, size_t align) {
goto justalloc;
if (!ptr || !oldsz) return zn_alloc_align(z, newsz, align);
if (z->cur && ptr == z->cur->beg - oldsz && z->cur->beg - oldsz + newsz < z->cur->end) {
z->cur->beg -= oldsz;
z->cur->beg += newsz;
return ptr;
} else {
justalloc:
void *p = zn_alloc_align(z, newsz, align);
memcpy(p, ptr, oldsz);
return p;
}
}
static inline size_t zn_align_for(size_t n) {
size_t a = 1;
while (n > a) a <<= 1;
return a;
}
void *zn_alloc(Zone *z, ptrdiff_t n) {
return zn_alloc_align(z, n, zn_align_for(n));
}
void *zn_realloc(Zone *z, void *ptr, ptrdiff_t oldsz, ptrdiff_t newsz) {
return zn_realloc_align(z, ptr, oldsz, newsz, zn_align_for(newsz));
}
void *zn_calloc(Zone *z, size_t n, size_t size) {
void *p = zn_alloc_align(z, n * size, zn_align_for(size));
memset(p, 0, n * size);
return p;
}
void zn_free(Zone *z) {
ZoneFrame *a = z->tail, *b;
while (a) {
b = a->prev;
zn_zf_free(a);
a = b;
}
}
void zn_reset(Zone *z) {
ZoneFrame *zf = z->tail;
while (zf) {
zf->beg = zf->data;
if (!zf->prev) break;
zf = zf->prev;
}
if (zf) z->cur = zf;
}
void zn_save(Zone *z, ZoneState *m) {
m->zf = z->cur;
m->beg = z->cur ? z->cur->beg : 0;
}
void zn_load(Zone *z, ZoneState *m) {
if (m->zf) {
while (z->cur != m->zf) {
z->cur->beg = z->cur->data;
z->cur = z->cur->prev;
}
m->zf->beg = m->beg;
} else {
zn_reset(z);
}
}
/* utils */
char *zn_strdup(Zone *z, const char *s) {
size_t n = strlen(s) + 1;
char *d = zn_alloc_align(z, n, 1);
memcpy(d, s, n);
return d;
}
void *zn_zeroed(void *ptr, size_t n) {
memset(ptr, 0, n);
return ptr;
}
#endif
#endif
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