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core: Prepare for M2-Planet: gc.c. 

* src/gc.c: Rewrite C constructs not supported by M2-Planet.
This commit is contained in:
Jan (janneke) Nieuwenhuizen 2019-10-20 13:23:47 +02:00
parent 8c8ad16c60
commit 94debd82e3
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GPG Key ID: F3C1A0D9C1D65273
1 changed files with 59 additions and 68 deletions
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127
src/gc.c
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@ -1,6 +1,6 @@
/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
@ -26,26 +26,13 @@
#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))
gc_init () /*:((internal)) */
{
#if SYSTEM_LIBC
ARENA_SIZE = 100000000; // 2.3GiB
ARENA_SIZE = 100000000; /* 2.3GiB */
#else
ARENA_SIZE = 300000; // 32b: 3MiB, 64b: 6 MiB
ARENA_SIZE = 300000; /* 32b: 3MiB, 64b: 6 MiB */
#endif
MAX_ARENA_SIZE = 100000000;
STACK_SIZE = 20000;
@ -72,50 +59,50 @@ gc_init () ///((internal))
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);
g_cells = a;
g_stack_array = a + arena_bytes;
TYPE (0) = TVECTOR;
LENGTH (0) = 1000;
VECTOR (0) = 0;
g_cells++;
g_cells = g_cells + 1;
TYPE (0) = TCHAR;
VALUE (0) = 'c';
// FIXME: remove MES_MAX_STRING, grow dynamically
g_buf = (char *) malloc (MAX_STRING);
/* FIXME: remove MES_MAX_STRING, grow dynamically */
g_buf = malloc (MAX_STRING);
return 0;
}
SCM
gc_init_news () ///((internal))
gc_init_news () /*:((internal)) */
{
g_news = g_cells + g_free;
NTYPE (0) = TVECTOR;
NLENGTH (0) = 1000;
NVECTOR (0) = 0;
g_news++;
g_news = g_news + 1;
NTYPE (0) = TCHAR;
NVALUE (0) = 'n';
return 0;
}
SCM
gc_up_arena () ///((internal))
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;
ARENA_SIZE = ARENA_SIZE << 1;
JAM_SIZE = JAM_SIZE << 1;
GC_SAFETY = 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)
if (p == 0)
{
eputs ("realloc failed, g_free=");
eputs (itoa (g_free));
@ -125,15 +112,15 @@ gc_up_arena () ///((internal))
assert (0);
exit (1);
}
g_cells = (struct scm *) p;
g_cells = p;
memcpy (p + arena_bytes, p + old_arena_bytes, STACK_SIZE * sizeof (SCM));
g_cells++;
g_cells = g_cells + 1;
return 0;
}
void
gc_flip () ///((internal))
gc_flip () /*:((internal)) */
{
if (g_debug > 2)
{
@ -147,17 +134,22 @@ gc_flip () ///((internal))
}
SCM
gc_copy (SCM old) ///((internal))
gc_copy (SCM old) /*:((internal)) */
{
if (TYPE (old) == TBROKEN_HEART)
return g_cells[old].car;
SCM new = g_free++;
return CAR (old);
SCM new = g_free;
g_free = g_free + 1;
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];
long i;
for (i = 0; i < LENGTH (old); i = i + 1)
{
g_news[g_free] = g_cells[VECTOR (old) + i];
g_free = g_free + 1;
}
}
else if (NTYPE (new) == TBYTES)
{
@ -165,7 +157,7 @@ gc_copy (SCM old) ///((internal))
char *dest = NCBYTES (new);
size_t length = NLENGTH (new);
memcpy (dest, src, length + 1);
g_free += bytes_cells (length) - 1;
g_free = g_free + bytes_cells (length) - 1;
if (g_debug > 4)
{
@ -189,21 +181,21 @@ gc_copy (SCM old) ///((internal))
}
SCM
gc_relocate_car (SCM new, SCM car) ///((internal))
gc_relocate_car (SCM new, SCM car) /*:((internal)) */
{
g_news[new].car = car;
NCAR (new) = car;
return cell_unspecified;
}
SCM
gc_relocate_cdr (SCM new, SCM cdr) ///((internal))
gc_relocate_cdr (SCM new, SCM cdr) /*:((internal)) */
{
g_news[new].cdr = cdr;
NCDR (new) = cdr;
return cell_unspecified;
}
void
gc_loop (SCM scan) ///((internal))
gc_loop (SCM scan) /*:((internal)) */
{
SCM car;
SCM cdr;
@ -211,21 +203,22 @@ gc_loop (SCM scan) ///((internal))
{
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
if (NTYPE (scan) == TMACRO || NTYPE (scan) == TPAIR || NTYPE (scan) == TREF || scan == 1 /* null */
|| NTYPE (scan) == TVARIABLE)
{
car = gc_copy (g_news[scan].car);
car = gc_copy (NCAR (scan));
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
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)
&& NCDR (scan)) /* allow for 0 terminated list of symbols */
{
cdr = gc_copy (g_news[scan].cdr);
cdr = gc_copy (NCDR (scan));
gc_relocate_cdr (scan, cdr);
}
if (NTYPE (scan) == TBYTES)
scan += bytes_cells (NLENGTH (scan)) - 1;
scan++;
scan = scan + bytes_cells (NLENGTH (scan)) - 1;
scan = scan + 1;
}
gc_flip ();
}
@ -239,7 +232,7 @@ gc_check ()
}
SCM
gc_ () ///((internal))
gc_ () /*:((internal)) */
{
gc_init_news ();
if (g_debug == 2)
@ -254,20 +247,16 @@ gc_ () ///((internal))
}
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 (itoa (g_cells));
eputs (",");
eputs (itoa ((unsigned long) g_news));
eputs (itoa (g_news));
eputs (":");
eputs (itoa (ARENA_SIZE));
eputs (",");
@ -277,13 +266,14 @@ gc_ () ///((internal))
gc_up_arena ();
}
for (long i = g_free; i < g_symbol_max; i++)
long i;
for (i = g_free; i < g_symbol_max; i = i + 1)
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++)
for (i = g_stack; i < STACK_SIZE; i = i + 1)
g_stack_array[i] = gc_copy (g_stack_array[i]);
gc_loop (1);
}
@ -315,20 +305,21 @@ gc ()
}
SCM
gc_push_frame () ///((internal))
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;
g_stack_array[g_stack - 1] = cell_f;
g_stack_array[g_stack - 2] = r0;
g_stack_array[g_stack - 3] = r1;
g_stack_array[g_stack - 4] = r2;
g_stack_array[g_stack - 5] = r3;
g_stack = g_stack - 5;
return g_stack;
}
SCM
gc_peek_frame () ///((internal))
gc_peek_frame () /*:((internal)) */
{
r3 = g_stack_array[g_stack];
r2 = g_stack_array[g_stack + 1];
@ -338,9 +329,9 @@ gc_peek_frame () ///((internal))
}
SCM
gc_pop_frame () ///((internal))
gc_pop_frame () /*:((internal)) */
{
SCM x = gc_peek_frame ();
g_stack += 5;
g_stack = g_stack + 5;
return x;
}