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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Damien Doligez, projet Para, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
/* Classification of addresses for GC and runtime purposes. */
#ifndef CAML_ADDRESS_CLASS_H
#define CAML_ADDRESS_CLASS_H
#include "config.h"
#include "misc.h"
#include "mlvalues.h"
/* Use the following macros to test an address for the different classes
it might belong to. */
#define Is_young(val) \
(CAMLassert (Is_block (val)), \
(addr)(val) < (addr)caml_young_end && (addr)(val) > (addr)caml_young_start)
#define Is_in_heap(a) (Classify_addr(a) & In_heap)
#define Is_in_heap_or_young(a) (Classify_addr(a) & (In_heap | In_young))
#define Is_in_value_area(a) \
(Classify_addr(a) & (In_heap | In_young | In_static_data))
#define Is_in_code_area(pc) \
( ((char *)(pc) >= caml_code_area_start && \
(char *)(pc) <= caml_code_area_end) \
|| (Classify_addr(pc) & In_code_area) )
#define Is_in_static_data(a) (Classify_addr(a) & In_static_data)
/***********************************************************************/
/* The rest of this file is private and may change without notice. */
extern value *caml_young_start, *caml_young_end;
extern char * caml_code_area_start, * caml_code_area_end;
#define Not_in_heap 0
#define In_heap 1
#define In_young 2
#define In_static_data 4
#define In_code_area 8
#ifdef ARCH_SIXTYFOUR
/* 64 bits: Represent page table as a sparse hash table */
int caml_page_table_lookup(void * addr);
#define Classify_addr(a) (caml_page_table_lookup((void *)(a)))
#else
/* 32 bits: Represent page table as a 2-level array */
#define Pagetable2_log 11
#define Pagetable2_size (1 << Pagetable2_log)
#define Pagetable1_log (Page_log + Pagetable2_log)
#define Pagetable1_size (1 << (32 - Pagetable1_log))
CAMLextern unsigned char * caml_page_table[Pagetable1_size];
#define Pagetable_index1(a) (((uintnat)(a)) >> Pagetable1_log)
#define Pagetable_index2(a) \
((((uintnat)(a)) >> Page_log) & (Pagetable2_size - 1))
#define Classify_addr(a) \
caml_page_table[Pagetable_index1(a)][Pagetable_index2(a)]
#endif
int caml_page_table_add(int kind, void * start, void * end);
int caml_page_table_remove(int kind, void * start, void * end);
int caml_page_table_initialize(mlsize_t bytesize);
#endif /* CAML_ADDRESS_CLASS_H */
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