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arena.h
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arena.h
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#ifndef ARENA_H
#define ARENA_H
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/mman.h>
#include <unistd.h>
#endif
#define ANT_ARENA_MIN (64 * 1024)
#define ANT_ARENA_MAX (256ULL * 1024 * 1024 * 1024)
#define ANT_ARENA_THRESHOLD (256ULL * 1024 * 1024)
#define ARENA_GROW_INCREMENT (8ULL * 1024 * 1024)
static inline void *mantissa_chk(void *p, const char *func) {
if (p && ((uintptr_t)p >> 48) != 0) {
fprintf(stderr,
"FATAL: %s returned pointer %p outside 48-bit NaN-boxing range\n"
"Please report this issue with your OS/architecture details.\n", func, p
); abort();
}
return p;
}
#define ant_calloc(size) mantissa_chk(calloc(1, size), "calloc")
#define ant_realloc(ptr, size) mantissa_chk(realloc(ptr, size), "realloc")
#ifdef _WIN32
static inline void *ant_arena_reserve(size_t max_size) {
void *p = VirtualAlloc(NULL, max_size, MEM_RESERVE, PAGE_NOACCESS);
return mantissa_chk(p, "VirtualAlloc");
}
static inline int ant_arena_commit(void *base, size_t old_size, size_t new_size) {
if (new_size <= old_size) return 0;
void *p = VirtualAlloc((char *)base + old_size, new_size - old_size, MEM_COMMIT, PAGE_READWRITE);
return p ? 0 : -1;
}
static inline void ant_arena_free(void *base, size_t reserved_size) {
(void)reserved_size;
if (base) VirtualFree(base, 0, MEM_RELEASE);
}
#else
static inline void *ant_arena_reserve(size_t max_size) {
void *p = mmap(NULL, max_size, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0);
if (p == MAP_FAILED) return NULL;
return mantissa_chk(p, "mmap");
}
static inline int ant_arena_commit(void *base, size_t old_size, size_t new_size) {
if (new_size <= old_size) return 0;
size_t page_size = (size_t)sysconf(_SC_PAGESIZE);
size_t old_pages = (old_size + page_size - 1) & ~(page_size - 1);
size_t new_pages = (new_size + page_size - 1) & ~(page_size - 1);
if (new_pages <= old_pages) return 0;
return mprotect((char *)base + old_pages, new_pages - old_pages, PROT_READ | PROT_WRITE);
}
static inline void ant_arena_free(void *base, size_t reserved_size) {
if (base) munmap(base, reserved_size);
}
#endif
#endif

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