353 lines
12 KiB
C
353 lines
12 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Damien Doligez, projet Para, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* Allocation macros and functions */
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#ifndef _memory_
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#define _memory_
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#include "config.h"
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#include "gc.h"
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#include "major_gc.h"
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#include "minor_gc.h"
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#include "misc.h"
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#include "mlvalues.h"
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value alloc_shr (mlsize_t, tag_t);
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void adjust_gc_speed (mlsize_t, mlsize_t);
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void modify (value *, value);
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void initialize (value *, value);
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value check_urgent_gc (value);
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void * stat_alloc (asize_t); /* Size in bytes. */
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void stat_free (void *);
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void * stat_resize (void *, asize_t); /* Size in bytes. */
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header_t *alloc_for_heap (asize_t request); /* Size in bytes. */
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void free_for_heap (header_t *mem);
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int add_to_heap (header_t *mem);
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color_t allocation_color (void *hp);
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/* void shrink_heap (char *); Only used in compact.c */
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#ifdef NATIVE_CODE
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#define Garbage_collection_function garbage_collection
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#else
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#define Garbage_collection_function minor_collection
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#endif
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#define Alloc_small(result, wosize, tag) { Assert (wosize >= 1); \
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young_ptr -= Bhsize_wosize (wosize); \
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if (young_ptr < young_limit){ \
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Setup_for_gc; \
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Garbage_collection_function (); \
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Restore_after_gc; \
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young_ptr -= Bhsize_wosize (wosize); \
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} \
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Hd_hp (young_ptr) = Make_header ((wosize), (tag), Caml_black); \
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(result) = Val_hp (young_ptr); \
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}
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/* You must use [Modify] to change a field of an existing shared block,
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unless you are sure the value being overwritten is not a shared block and
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the value being written is not a young block. */
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/* [Modify] never calls the GC. */
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#define Modify(fp, val) { \
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value _old_ = *(fp); \
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*(fp) = (val); \
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if (Is_in_heap (fp)){ \
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if (gc_phase == Phase_mark) darken (_old_, NULL); \
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if (Is_block (val) && Is_young (val) \
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&& ! (Is_block (_old_) && Is_young (_old_))){ \
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*ref_table_ptr++ = (fp); \
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if (ref_table_ptr >= ref_table_limit){ \
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Assert (ref_table_ptr == ref_table_limit); \
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realloc_ref_table (); \
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} \
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} \
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} \
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} \
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struct caml__roots_block {
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struct caml__roots_block *next;
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long ntables;
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long nitems;
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value *tables [5];
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};
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extern struct caml__roots_block *local_roots; /* defined in roots.c */
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/* The following macros are used to declare C local variables and
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function parameters of type [value].
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The function body must start with one of the [CAMLparam] macros.
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If the function has no parameter of type [value], use [CAMLparam0].
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If the function has 1 to 5 [value] parameters, use the corresponding
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[CAMLparam] with the parameters as arguments.
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If the function has more than 5 [value] parameters, use [CAMLparam5]
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for the first 5 parameters, and one or more calls to the [CAMLxparam]
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macros for the others.
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If the function takes an array of [value]s as argument, use
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[CAMLparamN] to declare it (or [CAMLxparamN] if you already have a
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call to [CAMLparam] for some other arguments).
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If you need local variables of type [value], declare them with one
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or more calls to the [CAMLlocal] macros.
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Use [CAMLlocalN] to declare an array of [value]s.
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Your function may raise and exception or return a [value] with the
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[CAMLreturn1] macro. Its argument is simply the [value] returned by
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your function. Do NOT directly return a [value] with the [return]
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keyword. If your function returns void, use [CAMLreturn0].
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All the identifiers beginning with "caml__" are reserved by Caml.
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Do not use them for anything (local or global variables, struct or
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union tags, macros, etc.)
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*/
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#define CAMLparam0() \
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struct caml__roots_block *caml__frame = local_roots
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#define CAMLparam1(x) \
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CAMLparam0 (); \
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CAMLxparam1 (x)
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#define CAMLparam2(x, y) \
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CAMLparam0 (); \
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CAMLxparam2 (x, y)
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#define CAMLparam3(x, y, z) \
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CAMLparam0 (); \
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CAMLxparam3 (x, y, z)
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#define CAMLparam4(x, y, z, t) \
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CAMLparam0 (); \
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CAMLxparam4 (x, y, z, t)
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#define CAMLparam5(x, y, z, t, u) \
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CAMLparam0 (); \
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CAMLxparam5 (x, y, z, t, u)
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#define CAMLparamN(x, size) \
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CAMLparam0 (); \
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CAMLxparamN (x, (size))
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#define CAMLxparam1(x) \
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struct caml__roots_block caml__roots_##x; \
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int caml__dummy_##x = ( \
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(caml__roots_##x.next = local_roots), \
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(local_roots = &caml__roots_##x), \
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(caml__roots_##x.nitems = 1), \
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(caml__roots_##x.ntables = 1), \
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(caml__roots_##x.tables [0] = &x), \
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0)
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#define CAMLxparam2(x, y) \
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struct caml__roots_block caml__roots_##x; \
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int caml__dummy_##x = ( \
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(caml__roots_##x.next = local_roots), \
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(local_roots = &caml__roots_##x), \
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(caml__roots_##x.nitems = 1), \
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(caml__roots_##x.ntables = 2), \
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(caml__roots_##x.tables [0] = &x), \
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(caml__roots_##x.tables [1] = &y), \
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0)
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#define CAMLxparam3(x, y, z) \
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struct caml__roots_block caml__roots_##x; \
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int caml__dummy_##x = ( \
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(caml__roots_##x.next = local_roots), \
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(local_roots = &caml__roots_##x), \
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(caml__roots_##x.nitems = 1), \
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(caml__roots_##x.ntables = 3), \
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(caml__roots_##x.tables [0] = &x), \
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(caml__roots_##x.tables [1] = &y), \
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(caml__roots_##x.tables [2] = &z), \
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0)
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#define CAMLxparam4(x, y, z, t) \
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struct caml__roots_block caml__roots_##x; \
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int caml__dummy_##x = ( \
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(caml__roots_##x.next = local_roots), \
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(local_roots = &caml__roots_##x), \
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(caml__roots_##x.nitems = 1), \
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(caml__roots_##x.ntables = 4), \
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(caml__roots_##x.tables [0] = &x), \
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(caml__roots_##x.tables [1] = &y), \
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(caml__roots_##x.tables [2] = &z), \
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(caml__roots_##x.tables [3] = &t), \
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0)
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#define CAMLxparam5(x, y, z, t, u) \
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struct caml__roots_block caml__roots_##x; \
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int caml__dummy_##x = ( \
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(caml__roots_##x.next = local_roots), \
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(local_roots = &caml__roots_##x), \
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(caml__roots_##x.nitems = 1), \
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(caml__roots_##x.ntables = 5), \
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(caml__roots_##x.tables [0] = &x), \
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(caml__roots_##x.tables [1] = &y), \
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(caml__roots_##x.tables [2] = &z), \
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(caml__roots_##x.tables [3] = &t), \
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(caml__roots_##x.tables [4] = &u), \
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0)
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#define CAMLxparamN(x, size) \
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struct caml__roots_block caml__roots_##x; \
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int caml__dummy_##x = ( \
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(caml__roots_##x.next = local_roots), \
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(local_roots = &caml__roots_##x), \
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(caml__roots_##x.nitems = (size)), \
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(caml__roots_##x.ntables = 1), \
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(caml__roots_##x.tables[0] = &(x[0])), \
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0)
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#define CAMLlocal1(x) \
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value x = 0; \
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CAMLxparam1 (x)
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#define CAMLlocal2(x, y) \
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value x = 0, y = 0; \
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CAMLxparam2 (x, y)
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#define CAMLlocal3(x, y, z) \
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value x = 0, y = 0, z = 0; \
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CAMLxparam3 (x, y, z)
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#define CAMLlocal4(x, y, z, t) \
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value x = 0, y = 0, z = 0, t = 0; \
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CAMLxparam4 (x, y, z, t)
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#define CAMLlocal5(x, y, z, t, u) \
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value x = 0, y = 0, z = 0, t = 0, u = 0; \
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CAMLxparam5 (x, y, z, t, u)
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#define CAMLlocalN(x, size) \
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value x [(size)] = { 0, /* 0, 0, ... */ }; \
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CAMLxparamN (x, (size))
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#define CAMLreturn0 do{ \
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local_roots = caml__frame; \
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return; \
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}while (0)
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#define CAMLreturn(result) do{ \
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local_roots = caml__frame; \
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return (result); \
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}while(0)
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/* convenience macro */
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#define Store_field(block, offset, val) modify (&Field (block, offset), val)
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/*
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NOTE: [Begin_roots] and [End_roots] are superseded by [CAMLparam]*,
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[CAMLxparam]*, [CAMLlocal]*, [CAMLreturn].
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[Begin_roots] and [End_roots] are used for C variables that are GC roots.
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It must contain all values in C local variables and function parameters
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at the time the minor GC is called.
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Usage:
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After initialising your local variables to legal Caml values, but before
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calling allocation functions, insert [Begin_roots_n(v1, ... vn)], where
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v1 ... vn are your variables of type [value] that you want to be updated
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across allocations.
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At the end, insert [End_roots()].
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Note that [Begin_roots] opens a new block, and [End_roots] closes it.
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Thus they must occur in matching pairs at the same brace nesting level.
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You can use [Val_unit] as a dummy initial value for your variables.
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*/
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#define Begin_root Begin_roots1
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#define Begin_roots1(r0) { \
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struct caml__roots_block caml__roots_block; \
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caml__roots_block.next = local_roots; \
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local_roots = &caml__roots_block; \
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caml__roots_block.nitems = 1; \
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caml__roots_block.ntables = 1; \
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caml__roots_block.tables[0] = &(r0);
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#define Begin_roots2(r0, r1) { \
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struct caml__roots_block caml__roots_block; \
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caml__roots_block.next = local_roots; \
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local_roots = &caml__roots_block; \
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caml__roots_block.nitems = 1; \
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caml__roots_block.ntables = 2; \
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caml__roots_block.tables[0] = &(r0); \
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caml__roots_block.tables[1] = &(r1);
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#define Begin_roots3(r0, r1, r2) { \
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struct caml__roots_block caml__roots_block; \
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caml__roots_block.next = local_roots; \
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local_roots = &caml__roots_block; \
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caml__roots_block.nitems = 1; \
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caml__roots_block.ntables = 3; \
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caml__roots_block.tables[0] = &(r0); \
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caml__roots_block.tables[1] = &(r1); \
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caml__roots_block.tables[2] = &(r2);
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#define Begin_roots4(r0, r1, r2, r3) { \
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struct caml__roots_block caml__roots_block; \
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caml__roots_block.next = local_roots; \
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local_roots = &caml__roots_block; \
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caml__roots_block.nitems = 1; \
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caml__roots_block.ntables = 4; \
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caml__roots_block.tables[0] = &(r0); \
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caml__roots_block.tables[1] = &(r1); \
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caml__roots_block.tables[2] = &(r2); \
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caml__roots_block.tables[3] = &(r3);
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#define Begin_roots5(r0, r1, r2, r3, r4) { \
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struct caml__roots_block caml__roots_block; \
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caml__roots_block.next = local_roots; \
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local_roots = &caml__roots_block; \
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caml__roots_block.nitems = 1; \
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caml__roots_block.ntables = 5; \
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caml__roots_block.tables[0] = &(r0); \
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caml__roots_block.tables[1] = &(r1); \
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caml__roots_block.tables[2] = &(r2); \
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caml__roots_block.tables[3] = &(r3); \
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caml__roots_block.tables[4] = &(r4);
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#define Begin_roots_block(table, size) { \
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struct caml__roots_block caml__roots_block; \
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caml__roots_block.next = local_roots; \
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local_roots = &caml__roots_block; \
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caml__roots_block.nitems = (size); \
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caml__roots_block.ntables = 1; \
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caml__roots_block.tables[0] = (table);
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#define End_roots() local_roots = caml__roots_block.next; }
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/* [register_global_root] registers a global C variable as a memory root
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for the duration of the program, or until [remove_global_root] is
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called. */
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void register_global_root (value *);
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/* [remove_global_root] removes a memory root registered on a global C
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variable with [register_global_root]. */
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void remove_global_root (value *);
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#endif /* _memory_ */
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