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mes/src/gc.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mes/lib.h"
#include "mes/mes.h"
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
long ARENA_SIZE;
long MAX_ARENA_SIZE;
long STACK_SIZE;
long JAM_SIZE;
long GC_SAFETY;
long MAX_STRING;
char *g_arena;
long g_free;
SCM g_stack;
SCM *g_stack_array;
struct scm *g_cells;
struct scm *g_news;
SCM
gc_init () ///((internal))
{
#if SYSTEM_LIBC
ARENA_SIZE = 100000000; // 2.3GiB
#else
ARENA_SIZE = 300000; // 32b: 3MiB, 64b: 6 MiB
#endif
MAX_ARENA_SIZE = 100000000;
STACK_SIZE = 20000;
JAM_SIZE = 20000;
GC_SAFETY = 2000;
MAX_STRING = 524288;
char *p;
if (p = getenv ("MES_MAX_ARENA"))
MAX_ARENA_SIZE = atoi (p);
if (p = getenv ("MES_ARENA"))
ARENA_SIZE = atoi (p);
JAM_SIZE = ARENA_SIZE / 10;
if (p = getenv ("MES_JAM"))
JAM_SIZE = atoi (p);
GC_SAFETY = ARENA_SIZE / 100;
if (p = getenv ("MES_SAFETY"))
GC_SAFETY = atoi (p);
if (p = getenv ("MES_STACK"))
STACK_SIZE = atoi (p);
if (p = getenv ("MES_MAX_STRING"))
MAX_STRING = atoi (p);
long arena_bytes = (ARENA_SIZE + JAM_SIZE) * sizeof (struct scm);
void *a = malloc (arena_bytes + STACK_SIZE * sizeof (SCM));
g_cells = (struct scm *) a;
g_stack_array = (SCM *) (a + arena_bytes);
TYPE (0) = TVECTOR;
LENGTH (0) = 1000;
VECTOR (0) = 0;
g_cells++;
TYPE (0) = TCHAR;
VALUE (0) = 'c';
// FIXME: remove MES_MAX_STRING, grow dynamically
g_buf = (char *) malloc (MAX_STRING);
return 0;
}
SCM
gc_init_news () ///((internal))
{
g_news = g_cells + g_free;
NTYPE (0) = TVECTOR;
NLENGTH (0) = 1000;
NVECTOR (0) = 0;
g_news++;
NTYPE (0) = TCHAR;
NVALUE (0) = 'n';
return 0;
}
SCM
gc_up_arena () ///((internal))
{
long old_arena_bytes = (ARENA_SIZE + JAM_SIZE) * sizeof (struct scm);
if (ARENA_SIZE >> 1 < MAX_ARENA_SIZE >> 2)
{
ARENA_SIZE <<= 1;
JAM_SIZE <<= 1;
GC_SAFETY <<= 1;
}
else
ARENA_SIZE = MAX_ARENA_SIZE - JAM_SIZE;
long arena_bytes = (ARENA_SIZE + JAM_SIZE) * sizeof (struct scm);
void *p = realloc (g_cells - 1, arena_bytes + STACK_SIZE * sizeof (SCM));
if (!p)
{
eputs ("realloc failed, g_free=");
eputs (itoa (g_free));
eputs (":");
eputs (itoa (ARENA_SIZE - g_free));
eputs ("\n");
assert (0);
exit (1);
}
g_cells = (struct scm *) p;
memcpy (p + arena_bytes, p + old_arena_bytes, STACK_SIZE * sizeof (SCM));
g_cells++;
return 0;
}
void
gc_flip () ///((internal))
{
if (g_debug > 2)
{
eputs (";;; => jam[");
eputs (itoa (g_free));
eputs ("]\n");
}
if (g_free > JAM_SIZE)
JAM_SIZE = g_free + g_free / 2;
memcpy (g_cells - 1, g_news - 1, (g_free + 2) * sizeof (struct scm));
}
SCM
gc_copy (SCM old) ///((internal))
{
if (TYPE (old) == TBROKEN_HEART)
return g_cells[old].car;
SCM new = g_free++;
g_news[new] = g_cells[old];
if (NTYPE (new) == TSTRUCT || NTYPE (new) == TVECTOR)
{
NVECTOR (new) = g_free;
for (long i = 0; i < LENGTH (old); i++)
g_news[g_free++] = g_cells[VECTOR (old) + i];
}
else if (NTYPE (new) == TBYTES)
{
char const *src = CBYTES (old);
char *dest = NCBYTES (new);
size_t length = NLENGTH (new);
memcpy (dest, src, length + 1);
g_free += bytes_cells (length) - 1;
if (g_debug > 4)
{
eputs ("gc copy bytes: ");
eputs (src);
eputs ("\n");
eputs (" length: ");
eputs (itoa (LENGTH (old)));
eputs ("\n");
eputs (" nlength: ");
eputs (itoa (NLENGTH (new)));
eputs ("\n");
eputs (" ==> ");
eputs (dest);
eputs ("\n");
}
}
TYPE (old) = TBROKEN_HEART;
CAR (old) = new;
return new;
}
SCM
gc_relocate_car (SCM new, SCM car) ///((internal))
{
g_news[new].car = car;
return cell_unspecified;
}
SCM
gc_relocate_cdr (SCM new, SCM cdr) ///((internal))
{
g_news[new].cdr = cdr;
return cell_unspecified;
}
void
gc_loop (SCM scan) ///((internal))
{
SCM car;
SCM cdr;
while (scan < g_free)
{
if (NTYPE (scan) == TBROKEN_HEART)
error (cell_symbol_system_error, cstring_to_symbol ("gc"));
if (NTYPE (scan) == TMACRO || NTYPE (scan) == TPAIR || NTYPE (scan) == TREF || scan == 1 // null
|| NTYPE (scan) == TVARIABLE)
{
car = gc_copy (g_news[scan].car);
gc_relocate_car (scan, car);
}
if ((NTYPE (scan) == TCLOSURE || NTYPE (scan) == TCONTINUATION || NTYPE (scan) == TKEYWORD || NTYPE (scan) == TMACRO || NTYPE (scan) == TPAIR || NTYPE (scan) == TPORT || NTYPE (scan) == TSPECIAL || NTYPE (scan) == TSTRING || NTYPE (scan) == TSYMBOL || scan == 1 // null
|| NTYPE (scan) == TVALUES) && g_news[scan].cdr) // allow for 0 terminated list of symbols
{
cdr = gc_copy (g_news[scan].cdr);
gc_relocate_cdr (scan, cdr);
}
if (NTYPE (scan) == TBYTES)
scan += bytes_cells (NLENGTH (scan)) - 1;
scan++;
}
gc_flip ();
}
SCM
gc_check ()
{
if (g_free + GC_SAFETY > ARENA_SIZE)
gc ();
return cell_unspecified;
}
SCM
gc_ () ///((internal))
{
gc_init_news ();
if (g_debug == 2)
eputs (".");
if (g_debug > 2)
{
eputs (";;; gc[");
eputs (itoa (g_free));
eputs (":");
eputs (itoa (ARENA_SIZE - g_free));
eputs ("]...");
}
g_free = 1;
#if __MESC__
if (ARENA_SIZE < MAX_ARENA_SIZE && (long) g_news > 0)
#else
if (ARENA_SIZE < MAX_ARENA_SIZE && g_news > 0)
#endif
{
if (g_debug == 2)
eputs ("+");
if (g_debug > 2)
{
eputs (" up[");
eputs (itoa ((unsigned long) g_cells));
eputs (",");
eputs (itoa ((unsigned long) g_news));
eputs (":");
eputs (itoa (ARENA_SIZE));
eputs (",");
eputs (itoa (MAX_ARENA_SIZE));
eputs ("]...");
}
gc_up_arena ();
}
for (long i = g_free; i < g_symbol_max; i++)
gc_copy (i);
g_symbols = gc_copy (g_symbols);
g_macros = gc_copy (g_macros);
g_ports = gc_copy (g_ports);
m0 = gc_copy (m0);
for (long i = g_stack; i < STACK_SIZE; i++)
g_stack_array[i] = gc_copy (g_stack_array[i]);
gc_loop (1);
}
SCM
gc ()
{
if (g_debug > 5)
{
eputs ("symbols: ");
write_error_ (g_symbols);
eputs ("\n");
eputs ("R0: ");
write_error_ (r0);
eputs ("\n");
}
gc_push_frame ();
gc_ ();
gc_pop_frame ();
if (g_debug > 5)
{
eputs ("symbols: ");
write_error_ (g_symbols);
eputs ("\n");
eputs ("R0: ");
write_error_ (r0);
eputs ("\n");
}
}
SCM
gc_push_frame () ///((internal))
{
if (g_stack < 5)
assert (!"STACK FULL");
g_stack_array[--g_stack] = cell_f;
g_stack_array[--g_stack] = r0;
g_stack_array[--g_stack] = r1;
g_stack_array[--g_stack] = r2;
g_stack_array[--g_stack] = r3;
return g_stack;
}
SCM
gc_peek_frame () ///((internal))
{
r3 = g_stack_array[g_stack];
r2 = g_stack_array[g_stack + 1];
r1 = g_stack_array[g_stack + 2];
r0 = g_stack_array[g_stack + 3];
return g_stack_array[g_stack + FRAME_PROCEDURE];
}
SCM
gc_pop_frame () ///((internal))
{
SCM x = gc_peek_frame ();
g_stack += 5;
return x;
}
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