1040 lines
22 KiB
C
1040 lines
22 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* Mes --- Maxwell Equations of Software
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* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of Mes.
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*
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* Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define _GNU_SOURCE
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#define DEBUG 0
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#define FIXED_PRIMITIVES 1
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int ARENA_SIZE = 100000;
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||
int MAX_ARENA_SIZE = 20000000;
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int GC_SAFETY = 100;
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||
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||
typedef int SCM;
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enum type_t {CHAR, CLOSURE, FUNCTION, KEYWORD, MACRO, NUMBER, PAIR, REF, SPECIAL, STRING, SYMBOL, VALUES, VECTOR, BROKEN_HEART};
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||
typedef SCM (*function0_t) (void);
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||
typedef SCM (*function1_t) (SCM);
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||
typedef SCM (*function2_t) (SCM, SCM);
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||
typedef SCM (*function3_t) (SCM, SCM, SCM);
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||
typedef SCM (*functionn_t) (SCM);
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||
typedef struct function_t {
|
||
union {
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||
function0_t function0;
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||
function1_t function1;
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||
function2_t function2;
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||
function3_t function3;
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||
functionn_t functionn;
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||
};
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||
int arity;
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||
} function;
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||
struct scm_t;
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||
typedef struct scm_t {
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||
enum type_t type;
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||
union {
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||
char const *name;
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||
SCM string;
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||
SCM car;
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||
SCM ref;
|
||
int length;
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||
};
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||
union {
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||
int value;
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||
int function;
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||
SCM cdr;
|
||
SCM closure;
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||
SCM macro;
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||
SCM vector;
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||
int hits;
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||
};
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} scm;
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||
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scm scm_nil = {SPECIAL, "()"};
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scm scm_f = {SPECIAL, "#f"};
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scm scm_t = {SPECIAL, "#t"};
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scm scm_dot = {SPECIAL, "."};
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||
scm scm_arrow = {SPECIAL, "=>"};
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||
scm scm_undefined = {SPECIAL, "*undefined*"};
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||
scm scm_unspecified = {SPECIAL, "*unspecified*"};
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scm scm_closure = {SPECIAL, "*closure*"};
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scm scm_circular = {SPECIAL, "*circular*"};
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scm scm_label = {SPECIAL, "label"};
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||
scm scm_begin = {SPECIAL, "*begin*"};
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scm scm_symbol_dot = {SYMBOL, "*dot*"};
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||
scm scm_symbol_lambda = {SYMBOL, "lambda"};
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||
scm scm_symbol_begin = {SYMBOL, "begin"};
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||
scm scm_symbol_if = {SYMBOL, "if"};
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||
scm scm_symbol_set_x = {SYMBOL, "set!"};
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||
|
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scm scm_symbol_quote = {SYMBOL, "quote"};
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||
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scm scm_symbol_sc_expand = {SYMBOL, "sc-expand"};
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scm scm_symbol_macro_expand = {SYMBOL, "macro-expand"};
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||
scm scm_symbol_sc_expander_alist = {SYMBOL, "*sc-expander-alist*"};
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||
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scm scm_symbol_call_with_values = {SYMBOL, "call-with-values"};
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||
scm scm_symbol_current_module = {SYMBOL, "current-module"};
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scm scm_symbol_primitive_load = {SYMBOL, "primitive-load"};
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||
scm scm_symbol_read_input_file = {SYMBOL, "read-input-file"};
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||
scm scm_symbol_display = {SYMBOL, "display"};
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||
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scm scm_symbol_car = {SYMBOL, "car"};
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scm scm_symbol_cdr = {SYMBOL, "cdr"};
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scm scm_symbol_null_p = {SYMBOL, "null?"};
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scm scm_symbol_eq_p = {SYMBOL, "eq?"};
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||
scm scm_symbol_cons = {SYMBOL, "cons"};
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scm g_free = {NUMBER, .value=0};
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||
scm *g_cells;
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||
scm *g_news = 0;
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||
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||
#include "mes.symbols.h"
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SCM tmp;
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||
SCM tmp_num;
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||
SCM tmp_num2;
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||
SCM tmp_num3;
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||
SCM tmp_num4;
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||
|
||
function functions[200];
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||
int g_function = 0;
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||
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||
SCM g_symbols = 0;
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||
SCM stack = 0;
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||
SCM r0 = 0; // a/env
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SCM r1 = 0; // param 1
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||
SCM r2 = 0; // param 2
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||
SCM r3 = 0; // param 3
|
||
|
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#include "lib.h"
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#include "math.h"
|
||
#include "mes.h"
|
||
#include "posix.h"
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#include "reader.h"
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#define CAR(x) g_cells[x].car
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||
#define CDR(x) g_cells[x].cdr
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#define HITS(x) g_cells[x].hits
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||
#define LENGTH(x) g_cells[x].length
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#define NAME(x) g_cells[x].name
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#define STRING(x) g_cells[x].string
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#define TYPE(x) g_cells[x].type
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#define CLOSURE(x) g_cells[x].closure
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||
#define MACRO(x) g_cells[x].macro
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||
#define REF(x) g_cells[x].ref
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#define VALUE(x) g_cells[x].value
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#define VECTOR(x) g_cells[x].vector
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#define FUNCTION(x) functions[g_cells[x].function]
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#define NCAR(x) g_news[x].car
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#define NTYPE(x) g_news[x].type
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#define CAAR(x) CAR (CAR (x))
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#define CDAR(x) CDR (CAR (x))
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#define CAAR(x) CAR (CAR (x))
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#define CADAR(x) CAR (CDR (CAR (x)))
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#define CADDR(x) CAR (CDR (CDR (x)))
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#define CDADAR(x) CAR (CDR (CAR (CDR (x))))
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#define CADR(x) CAR (CDR (x))
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#define MAKE_CHAR(n) make_cell (tmp_num_ (CHAR), 0, tmp_num2_ (n))
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#define MAKE_NUMBER(n) make_cell (tmp_num_ (NUMBER), 0, tmp_num2_ (n))
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#define MAKE_REF(n) make_cell (tmp_num_ (REF), n, 0)
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#define MAKE_STRING(x) make_cell (tmp_num_ (STRING), x, 0)
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int error (char const* msg, SCM x);
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SCM vm_call (function0_t f, SCM p1, SCM p2, SCM a);
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||
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||
SCM
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||
tmp_num_ (int x)
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{
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||
g_cells[tmp_num].value = x;
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||
return tmp_num;
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||
}
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||
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||
SCM
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tmp_num2_ (int x)
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{
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||
g_cells[tmp_num2].value = x;
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return tmp_num2;
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}
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SCM
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alloc (int n)
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{
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||
assert (g_free.value + n < ARENA_SIZE);
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||
SCM x = g_free.value;
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||
g_free.value += n;
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||
return x;
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||
}
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||
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SCM
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make_cell (SCM type, SCM car, SCM cdr)
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{
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||
SCM x = alloc (1);
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||
assert (TYPE (type) == NUMBER);
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TYPE (x) = VALUE (type);
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if (VALUE (type) == CHAR || VALUE (type) == NUMBER) {
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if (car) CAR (x) = CAR (car);
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if (cdr) CDR (x) = CDR (cdr);
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} else if (VALUE (type) == FUNCTION) {
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if (car) CAR (x) = car;
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if (cdr) CDR (x) = CDR (cdr);
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} else {
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CAR (x) = car;
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CDR (x) = cdr;
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}
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return x;
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}
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SCM
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cons (SCM x, SCM y)
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{
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g_cells[tmp_num].value = PAIR;
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return make_cell (tmp_num, x, y);
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}
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SCM
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car (SCM x)
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{
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if (TYPE (x) != PAIR) error ("car: not pair: ", x);
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return CAR (x);
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}
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SCM
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cdr (SCM x)
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{
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if (TYPE (x) != PAIR) error ("cdr: not pair: ", x);
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return CDR (x);
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}
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SCM
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type_ (SCM x)
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{
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return MAKE_NUMBER (TYPE (x));
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}
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SCM
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car_ (SCM x)
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{
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return (TYPE (CAR (x)) == PAIR
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|| TYPE (CAR (x)) == REF
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|| TYPE (CAR (x)) == SYMBOL
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|| TYPE (CAR (x)) == STRING) ? CAR (x) : MAKE_NUMBER (CAR (x));
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}
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SCM
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cdr_ (SCM x)
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{
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return (TYPE (CDR (x)) == PAIR
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|| TYPE (CDR (x)) == REF
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|| TYPE (CDR (x)) == SYMBOL
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|| TYPE (CDR (x)) == STRING) ? CDR (x) : MAKE_NUMBER (CDR (x));
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}
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SCM
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eq_p (SCM x, SCM y)
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{
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return (x == y
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|| ((TYPE (x) == KEYWORD && TYPE (y) == KEYWORD
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&& STRING (x) == STRING (y)))
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|| (TYPE (x) == CHAR && TYPE (y) == CHAR
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&& VALUE (x) == VALUE (y))
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|| (TYPE (x) == NUMBER && TYPE (y) == NUMBER
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&& VALUE (x) == VALUE (y)))
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? cell_t : cell_f;
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}
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SCM
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set_car_x (SCM x, SCM e)
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{
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assert (TYPE (x) == PAIR);
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CAR (x) = e;
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return cell_unspecified;
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}
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SCM
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set_cdr_x (SCM x, SCM e)
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{
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if (TYPE (x) != PAIR) error ("set-cdr!: not pair: ", x);
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CDR (x) = e;
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return cell_unspecified;
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}
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||
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SCM
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set_env_x (SCM x, SCM e, SCM a)
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{
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SCM p = assert_defined (x, assq (x, a));
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if (TYPE (p) != PAIR) error ("set-env!: not pair: ", x);
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return set_cdr_x (p, e);
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}
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SCM
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pairlis (SCM x, SCM y, SCM a)
|
||
{
|
||
if (x == cell_nil)
|
||
return a;
|
||
if (TYPE (x) != PAIR)
|
||
return cons (cons (x, y), a);
|
||
return cons (cons (car (x), car (y)),
|
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pairlis (cdr (x), cdr (y), a));
|
||
}
|
||
|
||
SCM
|
||
assq (SCM x, SCM a)
|
||
{
|
||
while (a != cell_nil && eq_p (x, CAAR (a)) == cell_f)
|
||
{
|
||
if (TYPE (a) == BROKEN_HEART || TYPE (CAR (a)) == BROKEN_HEART)
|
||
fprintf (stderr, "oops, broken heart\n");
|
||
a = CDR (a);
|
||
}
|
||
return a != cell_nil ? car (a) : cell_f;
|
||
}
|
||
|
||
SCM
|
||
assq_ref_cache (SCM x, SCM a)
|
||
{
|
||
x = assq (x, a);
|
||
if (x == cell_f) return cell_undefined;
|
||
return cdr (x);
|
||
}
|
||
|
||
enum eval_apply_t {EVLIS, APPLY, EVAL, MACRO_EXPAND, BEGIN, IF, CALL_WITH_VALUES};
|
||
enum eval_apply_t g_target;
|
||
|
||
SCM
|
||
call_lambda (SCM e, SCM x, SCM aa, SCM a) ///((internal))
|
||
{
|
||
SCM cl = cons (cons (cell_closure, x), x);
|
||
r1 = e;
|
||
r0 = cl;
|
||
r2 = a;
|
||
r3 = aa;
|
||
return cell_unspecified;
|
||
}
|
||
|
||
SCM
|
||
eval_apply ()
|
||
{
|
||
switch (g_target)
|
||
{
|
||
case EVLIS: goto evlis;
|
||
case APPLY: goto apply;
|
||
case EVAL: goto eval;
|
||
case MACRO_EXPAND: goto macro_expand;
|
||
case BEGIN: goto begin;
|
||
case IF: goto label_if;
|
||
case CALL_WITH_VALUES: goto call_with_values;
|
||
}
|
||
|
||
evlis:
|
||
if (r1 == cell_nil) return cell_nil;
|
||
if (TYPE (r1) != PAIR) goto eval;
|
||
r2 = eval_env (car (r1), r0);
|
||
r1 = evlis_env (cdr (r1), r0);
|
||
return cons (r2, r1);
|
||
|
||
apply:
|
||
switch (TYPE (r1))
|
||
{
|
||
case FUNCTION: {
|
||
check_formals (r1, MAKE_NUMBER (FUNCTION (r1).arity), r2);
|
||
return call (r1, r2);
|
||
}
|
||
case CLOSURE:
|
||
{
|
||
SCM cl = CLOSURE (r1);
|
||
SCM formals = cadr (cl);
|
||
SCM body = cddr (cl);
|
||
SCM aa = cdar (cl);
|
||
aa = cdr (aa);
|
||
check_formals (r1, formals, r2);
|
||
SCM p = pairlis (formals, r2, aa);
|
||
call_lambda (body, p, aa, r0);
|
||
goto begin;
|
||
}
|
||
case SYMBOL:
|
||
{
|
||
if (r1 == cell_symbol_call_with_values)
|
||
{
|
||
r1 = car (r2);
|
||
r2 = cadr (r2);
|
||
goto call_with_values;
|
||
}
|
||
if (r1 == cell_symbol_current_module) return r0;
|
||
break;
|
||
}
|
||
case PAIR:
|
||
{
|
||
switch (car (r1))
|
||
{
|
||
case cell_symbol_lambda:
|
||
{
|
||
SCM formals = cadr (r1);
|
||
SCM body = cddr (r1);
|
||
SCM p = pairlis (formals, r2, r0);
|
||
check_formals (r1, formals, r2);
|
||
call_lambda (body, p, p, r0);
|
||
goto begin;
|
||
}
|
||
#if BOOT
|
||
case cell_symbol_label:
|
||
{
|
||
r0 = cons (cons (cadr (r1), caddr (r1)), r0);
|
||
r1 = caddr (r1);
|
||
goto apply;
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
}
|
||
SCM e = eval_env (r1, r0);
|
||
check_apply (e, r1);
|
||
r1 = e;
|
||
goto apply;
|
||
|
||
eval:
|
||
switch (TYPE (r1))
|
||
{
|
||
case PAIR:
|
||
{
|
||
switch (car (r1))
|
||
{
|
||
#if FIXED_PRIMITIVES
|
||
case cell_symbol_car: return car (eval_env (CADR (r1), r0));
|
||
case cell_symbol_cdr: return cdr (eval_env (CADR (r1), r0));
|
||
case cell_symbol_cons: {SCM m = evlis_env (CDR (r1), r0);
|
||
return cons (CAR (m), CADR (m));}
|
||
case cell_symbol_null_p: return null_p (eval_env (CADR (r1), r0));
|
||
#endif // FIXED_PRIMITIVES
|
||
case cell_symbol_quote: return cadr (r1);
|
||
case cell_symbol_begin: goto begin;
|
||
case cell_symbol_lambda:
|
||
return make_closure (cadr (r1), cddr (r1), assq (cell_closure, r0));
|
||
case cell_symbol_if: {r1=cdr (r1); goto label_if;}
|
||
case cell_symbol_set_x: {
|
||
SCM x = eval_env (caddr (r1), r0); return set_env_x (cadr (r1), x, r0);
|
||
}
|
||
default: {
|
||
SCM x = macro_expand_env (r1, r0);
|
||
if (x != r1)
|
||
{
|
||
if (TYPE (x) == PAIR)
|
||
{
|
||
set_cdr_x (r1, cdr (x));
|
||
set_car_x (r1, car (x));
|
||
}
|
||
r1 = x;
|
||
goto eval;
|
||
}
|
||
SCM m = evlis_env (CDR (r1), r0);
|
||
r1 = car (r1);
|
||
r2 = m;
|
||
goto apply;
|
||
}
|
||
}
|
||
}
|
||
case SYMBOL: return assert_defined (r1, assq_ref_cache (r1, r0));
|
||
default: return r1;
|
||
}
|
||
|
||
SCM macro;
|
||
SCM expanders;
|
||
macro_expand:
|
||
if (TYPE (r1) == PAIR
|
||
&& (macro = lookup_macro (car (r1), r0)) != cell_f)
|
||
{
|
||
r2 = CDR (r1);
|
||
r1 = macro;
|
||
goto apply;
|
||
}
|
||
else if (TYPE (r1) == PAIR
|
||
&& TYPE (CAR (r1)) == SYMBOL
|
||
&& ((expanders = assq_ref_cache (cell_symbol_sc_expander_alist, r0)) != cell_undefined)
|
||
&& ((macro = assq (CAR (r1), expanders)) != cell_f))
|
||
{
|
||
SCM sc_expand = assq_ref_cache (cell_symbol_macro_expand, r0);
|
||
if (sc_expand != cell_undefined && sc_expand != cell_f)
|
||
{
|
||
r2 = cons (r1, cell_nil);
|
||
r1 = sc_expand;
|
||
goto apply;
|
||
}
|
||
}
|
||
return r1;
|
||
|
||
SCM r;
|
||
begin:
|
||
r = cell_unspecified;
|
||
while (r1 != cell_nil) {
|
||
if (TYPE (r1) == PAIR && TYPE (CAR (r1)) == PAIR)
|
||
{
|
||
if (caar (r1) == cell_symbol_begin)
|
||
r1 = append2 (cdar (r1), cdr (r1));
|
||
else if (caar (r1) == cell_symbol_primitive_load)
|
||
{
|
||
SCM f = read_input_file_env (r0);
|
||
r1 = append2 (f, cdr (r1));
|
||
}
|
||
}
|
||
if (CDR (r1) == cell_nil)
|
||
{
|
||
r1 = car (r1);
|
||
goto eval;
|
||
}
|
||
r = eval_env (car (r1), r0);
|
||
r1 = CDR (r1);
|
||
}
|
||
return r;
|
||
|
||
SCM x;
|
||
label_if:
|
||
x = eval_env (car (r1), r0);
|
||
if (x != cell_f)
|
||
{
|
||
r1 = cadr (r1);
|
||
goto eval;
|
||
}
|
||
if (cddr (r1) != cell_nil)
|
||
{
|
||
r1 = caddr (r1);
|
||
goto eval;
|
||
}
|
||
return cell_unspecified;
|
||
|
||
SCM v;
|
||
call_with_values:
|
||
v = apply_env (r1, cell_nil, r0);
|
||
if (TYPE (v) == VALUES)
|
||
v = CDR (v);
|
||
r1 = r2;
|
||
r2 = v;
|
||
goto apply;
|
||
}
|
||
|
||
SCM
|
||
call (SCM fn, SCM x)
|
||
{
|
||
if ((FUNCTION (fn).arity > 0 || FUNCTION (fn).arity == -1)
|
||
&& x != cell_nil && TYPE (CAR (x)) == VALUES)
|
||
x = cons (CADAR (x), CDR (x));
|
||
if ((FUNCTION (fn).arity > 1 || FUNCTION (fn).arity == -1)
|
||
&& x != cell_nil && TYPE (CDR (x)) == PAIR && TYPE (CADR (x)) == VALUES)
|
||
x = cons (CAR (x), cons (CDADAR (x), CDR (x)));
|
||
switch (FUNCTION (fn).arity)
|
||
{
|
||
case 0: return FUNCTION (fn).function0 ();
|
||
case 1: return FUNCTION (fn).function1 (car (x));
|
||
case 2: return FUNCTION (fn).function2 (car (x), cadr (x));
|
||
case 3: return FUNCTION (fn).function3 (car (x), cadr (x), caddr (x));
|
||
case -1: return FUNCTION (fn).functionn (x);
|
||
}
|
||
|
||
return cell_unspecified;
|
||
}
|
||
|
||
SCM
|
||
gc_frame (SCM stack)
|
||
{
|
||
SCM frame = car (stack);
|
||
r1 = car (frame);
|
||
r2 = cadr (frame);
|
||
r3 = caddr (frame);
|
||
r0 = cadddr (frame);
|
||
return frame;
|
||
}
|
||
|
||
SCM
|
||
gc_stack (SCM a)
|
||
{
|
||
SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
|
||
stack = cons (frame, stack);
|
||
stack = gc (stack);
|
||
gc_frame (stack);
|
||
stack = cdr (stack);
|
||
return stack;
|
||
}
|
||
|
||
SCM
|
||
vm_call (function0_t f, SCM p1, SCM p2, SCM a)
|
||
{
|
||
SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
|
||
stack = cons (frame, stack);
|
||
r1 = p1;
|
||
r2 = p2;
|
||
r0 = a;
|
||
if (g_free.value + GC_SAFETY > ARENA_SIZE)
|
||
gc_stack (stack);
|
||
|
||
SCM r = f ();
|
||
frame = gc_frame (stack);
|
||
stack = cdr (stack);
|
||
return r;
|
||
}
|
||
|
||
SCM
|
||
evlis_env (SCM m, SCM a)
|
||
{
|
||
g_target = EVLIS;
|
||
return vm_call (eval_apply, m, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
apply_env (SCM fn, SCM x, SCM a)
|
||
{
|
||
g_target = APPLY;
|
||
return vm_call (eval_apply, fn, x, a);
|
||
}
|
||
|
||
SCM
|
||
eval_env (SCM e, SCM a)
|
||
{
|
||
g_target = EVAL;
|
||
return vm_call (eval_apply, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
macro_expand_env (SCM e, SCM a)
|
||
{
|
||
g_target = MACRO_EXPAND;
|
||
return vm_call (eval_apply, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
begin_env (SCM e, SCM a)
|
||
{
|
||
g_target = BEGIN;
|
||
return vm_call (eval_apply, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
if_env (SCM e, SCM a)
|
||
{
|
||
g_target = IF;
|
||
return vm_call (eval_apply, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
call_with_values_env (SCM producer, SCM consumer, SCM a)
|
||
{
|
||
g_target = CALL_WITH_VALUES;
|
||
return vm_call (eval_apply, producer, consumer, a);
|
||
}
|
||
|
||
SCM
|
||
append2 (SCM x, SCM y)
|
||
{
|
||
if (x == cell_nil) return y;
|
||
assert (TYPE (x) == PAIR);
|
||
return cons (car (x), append2 (cdr (x), y));
|
||
}
|
||
|
||
SCM
|
||
append (SCM x) ///((arity . n))
|
||
{
|
||
if (x == cell_nil) return cell_nil;
|
||
if (cdr (x) == cell_nil) return car (x);
|
||
return append2 (car (x), append (cdr (x)));
|
||
}
|
||
|
||
SCM
|
||
cstring_to_list (char const* s)
|
||
{
|
||
SCM p = cell_nil;
|
||
int i = strlen (s);
|
||
while (i--)
|
||
p = cons (MAKE_CHAR (s[i]), p);
|
||
return p;
|
||
}
|
||
|
||
SCM
|
||
null_p (SCM x)
|
||
{
|
||
return x == cell_nil ? cell_t : cell_f;
|
||
}
|
||
|
||
SCM
|
||
make_symbol_ (SCM s)
|
||
{
|
||
g_cells[tmp_num].value = SYMBOL;
|
||
SCM x = make_cell (tmp_num, s, 0);
|
||
g_symbols = cons (x, g_symbols);
|
||
return x;
|
||
}
|
||
|
||
SCM
|
||
make_symbol (SCM s)
|
||
{
|
||
SCM x = lookup_symbol_ (s);
|
||
return x ? x : make_symbol_ (s);
|
||
}
|
||
|
||
SCM
|
||
make_vector (SCM n)
|
||
{
|
||
int k = VALUE (n);
|
||
g_cells[tmp_num].value = VECTOR;
|
||
SCM v = alloc (k);
|
||
SCM x = make_cell (tmp_num, k, v);
|
||
for (int i=0; i<k; i++) g_cells[v+i] = g_cells[vector_entry (cell_unspecified)];
|
||
return x;
|
||
}
|
||
|
||
SCM
|
||
arity_ (SCM x)
|
||
{
|
||
assert (TYPE (x) == FUNCTION);
|
||
return MAKE_NUMBER (FUNCTION (x).arity);
|
||
}
|
||
|
||
SCM
|
||
values (SCM x) ///((arity . n))
|
||
{
|
||
SCM v = cons (0, x);
|
||
TYPE (v) = VALUES;
|
||
return v;
|
||
}
|
||
|
||
SCM
|
||
vector_length (SCM x)
|
||
{
|
||
assert (TYPE (x) == VECTOR);
|
||
return MAKE_NUMBER (LENGTH (x));
|
||
}
|
||
|
||
SCM
|
||
vector_ref (SCM x, SCM i)
|
||
{
|
||
assert (TYPE (x) == VECTOR);
|
||
assert (VALUE (i) < LENGTH (x));
|
||
SCM e = VECTOR (x) + VALUE (i);
|
||
if (TYPE (e) == REF) e = g_cells[e].ref;
|
||
if (TYPE (e) == CHAR) e = MAKE_CHAR (VALUE (e));
|
||
if (TYPE (e) == NUMBER) e = MAKE_NUMBER (VALUE (e));
|
||
return e;
|
||
}
|
||
|
||
SCM
|
||
vector_entry (SCM x) {
|
||
if (TYPE (x) == PAIR || TYPE (x) == SPECIAL || TYPE (x) == STRING || TYPE (x) == SYMBOL || TYPE (x) == VECTOR) x = MAKE_REF (x);
|
||
return x;
|
||
}
|
||
|
||
SCM
|
||
vector_set_x (SCM x, SCM i, SCM e)
|
||
{
|
||
assert (TYPE (x) == VECTOR);
|
||
assert (VALUE (i) < LENGTH (x));
|
||
g_cells[VECTOR (x)+g_cells[i].value] = g_cells[vector_entry (e)];
|
||
return cell_unspecified;
|
||
}
|
||
|
||
SCM
|
||
list_to_vector (SCM x)
|
||
{
|
||
VALUE (tmp_num) = VALUE (length (x));
|
||
SCM v = make_vector (tmp_num);
|
||
SCM p = VECTOR (v);
|
||
while (x != cell_nil)
|
||
{
|
||
g_cells[p++] = g_cells[vector_entry (car (x))];
|
||
x = cdr (x);
|
||
}
|
||
return v;
|
||
}
|
||
|
||
SCM
|
||
vector_to_list (SCM v)
|
||
{
|
||
SCM x = cell_nil;
|
||
for (int i = 0; i < LENGTH (v); i++) {
|
||
SCM e = VECTOR (v)+i;
|
||
if (TYPE (e) == REF) e = g_cells[e].ref;
|
||
x = append2 (x, cons (e, cell_nil));
|
||
}
|
||
return x;
|
||
}
|
||
|
||
void
|
||
make_tmps (scm* cells)
|
||
{
|
||
tmp = g_free.value++;
|
||
cells[tmp].type = CHAR;
|
||
tmp_num = g_free.value++;
|
||
cells[tmp_num].type = NUMBER;
|
||
tmp_num2 = g_free.value++;
|
||
cells[tmp_num2].type = NUMBER;
|
||
tmp_num3 = g_free.value++;
|
||
cells[tmp_num3].type = NUMBER;
|
||
tmp_num4 = g_free.value++;
|
||
cells[tmp_num4].type = NUMBER;
|
||
}
|
||
|
||
// Jam Collector
|
||
SCM g_symbol_max;
|
||
bool g_debug = false;
|
||
|
||
SCM
|
||
gc_up_arena ()
|
||
{
|
||
ARENA_SIZE *= 2;
|
||
void *p = realloc (g_cells-1, 2*ARENA_SIZE*sizeof(scm));
|
||
if (!p) error (strerror (errno), MAKE_NUMBER (g_free.value));
|
||
g_cells = (scm*)p;
|
||
g_cells++;
|
||
gc_init_news ();
|
||
}
|
||
|
||
SCM
|
||
gc ()
|
||
{
|
||
if (g_debug) fprintf (stderr, "***gc[%d]...", g_free.value);
|
||
g_free.value = 1;
|
||
if (g_cells < g_news && ARENA_SIZE < MAX_ARENA_SIZE) gc_up_arena ();
|
||
for (int i=g_free.value; i<g_symbol_max; i++)
|
||
gc_copy (i);
|
||
make_tmps (g_news);
|
||
g_symbols = gc_copy (g_symbols);
|
||
SCM new = gc_copy (stack);
|
||
if (g_debug) fprintf (stderr, "new=%d\n", new, stack);
|
||
stack = new;
|
||
return gc_loop (1);
|
||
}
|
||
|
||
SCM
|
||
gc_loop (SCM scan)
|
||
{
|
||
while (scan < g_free.value)
|
||
{
|
||
if (NTYPE (scan) == CLOSURE
|
||
|| NTYPE (scan) == FUNCTION
|
||
|| NTYPE (scan) == KEYWORD
|
||
|| NTYPE (scan) == MACRO
|
||
|| NTYPE (scan) == PAIR
|
||
|| NTYPE (scan) == REF
|
||
|| scan == 1 // null
|
||
|| NTYPE (scan) == SPECIAL
|
||
|| NTYPE (scan) == STRING
|
||
|| NTYPE (scan) == SYMBOL)
|
||
{
|
||
SCM car = gc_copy (g_news[scan].car);
|
||
gc_relocate_car (scan, car);
|
||
}
|
||
if ((NTYPE (scan) == CLOSURE
|
||
|| NTYPE (scan) == MACRO
|
||
|| NTYPE (scan) == PAIR
|
||
|| NTYPE (scan) == VALUES)
|
||
&& g_news[scan].cdr) // allow for 0 terminated list of symbols
|
||
{
|
||
SCM cdr = gc_copy (g_news[scan].cdr);
|
||
gc_relocate_cdr (scan, cdr);
|
||
}
|
||
scan++;
|
||
}
|
||
return gc_flip ();
|
||
}
|
||
|
||
SCM
|
||
gc_copy (SCM old)
|
||
{
|
||
if (TYPE (old) == BROKEN_HEART) return g_cells[old].car;
|
||
SCM new = g_free.value++;
|
||
g_news[new] = g_cells[old];
|
||
if (NTYPE (new) == VECTOR)
|
||
{
|
||
g_news[new].vector = g_free.value;
|
||
for (int i=0; i<LENGTH (old); i++)
|
||
g_news[g_free.value++] = g_cells[VECTOR (old)+i];
|
||
}
|
||
g_cells[old].type = BROKEN_HEART;
|
||
g_cells[old].car = new;
|
||
return new;
|
||
}
|
||
|
||
SCM
|
||
gc_relocate_car (SCM new, SCM car)
|
||
{
|
||
g_news[new].car = car;
|
||
return cell_unspecified;
|
||
}
|
||
|
||
SCM
|
||
gc_relocate_cdr (SCM new, SCM cdr)
|
||
{
|
||
g_news[new].cdr = cdr;
|
||
return cell_unspecified;
|
||
}
|
||
|
||
SCM
|
||
gc_flip ()
|
||
{
|
||
scm *cells = g_cells;
|
||
g_cells = g_news;
|
||
g_news = cells;
|
||
if (g_debug) fprintf (stderr, " => jam[%d]\n", g_free.value);
|
||
return stack;
|
||
}
|
||
|
||
// Environment setup
|
||
SCM
|
||
acons (SCM key, SCM value, SCM alist)
|
||
{
|
||
return cons (cons (key, value), alist);
|
||
}
|
||
|
||
SCM
|
||
gc_init_cells ()
|
||
{
|
||
g_cells = (scm *)malloc (2*ARENA_SIZE*sizeof(scm));
|
||
g_cells[0].type = VECTOR;
|
||
g_cells[0].length = 1000;
|
||
g_cells[0].vector = 0;
|
||
g_cells++;
|
||
g_cells[0].type = CHAR;
|
||
g_cells[0].value = 'c';
|
||
}
|
||
|
||
SCM
|
||
gc_init_news ()
|
||
{
|
||
g_news = g_cells-1 + ARENA_SIZE;
|
||
g_news[0].type = VECTOR;
|
||
g_news[0].length = 1000;
|
||
g_news[0].vector = 0;
|
||
g_news++;
|
||
g_news[0].type = CHAR;
|
||
g_news[0].value = 'n';
|
||
}
|
||
|
||
SCM
|
||
mes_symbols () ///((internal))
|
||
{
|
||
gc_init_cells ();
|
||
gc_init_news ();
|
||
|
||
#include "mes.symbols.i"
|
||
|
||
g_symbol_max = g_free.value;
|
||
make_tmps (g_cells);
|
||
|
||
g_symbols = 0;
|
||
for (int i=1; i<g_symbol_max; i++)
|
||
g_symbols = cons (i, g_symbols);
|
||
|
||
SCM a = cell_nil;
|
||
|
||
#include "mes.symbol-names.i"
|
||
|
||
#if BOOT
|
||
a = acons (cell_symbol_label, cell_t, a);
|
||
#endif
|
||
a = acons (cell_symbol_dot, cell_dot, a);
|
||
a = acons (cell_symbol_begin, cell_begin, a);
|
||
a = acons (cell_symbol_sc_expand, cell_f, a);
|
||
a = acons (cell_closure, a, a);
|
||
|
||
return a;
|
||
}
|
||
|
||
SCM
|
||
mes_builtins (SCM a)
|
||
{
|
||
#include "mes.i"
|
||
|
||
#include "lib.i"
|
||
#include "math.i"
|
||
#include "posix.i"
|
||
#include "reader.i"
|
||
|
||
#include "lib.environment.i"
|
||
#include "math.environment.i"
|
||
#include "mes.environment.i"
|
||
#include "posix.environment.i"
|
||
#include "reader.environment.i"
|
||
|
||
return a;
|
||
}
|
||
|
||
SCM
|
||
mes_stack (SCM a) ///((internal))
|
||
{
|
||
r0 = a;
|
||
r1 = MAKE_CHAR (0);
|
||
r2 = MAKE_CHAR (0);
|
||
r3 = MAKE_CHAR (0);
|
||
stack = cons (cell_nil, cell_nil);
|
||
return r0;
|
||
}
|
||
|
||
SCM
|
||
mes_environment () ///((internal))
|
||
{
|
||
SCM a = mes_symbols ();
|
||
return mes_stack (a);
|
||
}
|
||
|
||
SCM
|
||
make_closure (SCM args, SCM body, SCM a)
|
||
{
|
||
return make_cell (tmp_num_ (CLOSURE), cell_f, cons (cons (cell_circular, a), cons (args, body)));
|
||
}
|
||
|
||
SCM
|
||
lookup_macro (SCM x, SCM a)
|
||
{
|
||
if (TYPE (x) != SYMBOL) return cell_f;
|
||
SCM m = assq_ref_cache (x, a);
|
||
if (TYPE (m) == MACRO) return MACRO (m);
|
||
return cell_f;
|
||
}
|
||
|
||
FILE *g_stdin;
|
||
#include "lib.c"
|
||
#include "math.c"
|
||
#include "posix.c"
|
||
#include "reader.c"
|
||
|
||
int
|
||
main (int argc, char *argv[])
|
||
{
|
||
g_debug = getenv ("MES_DEBUG");
|
||
if (getenv ("MES_ARENA")) ARENA_SIZE = atoi (getenv ("MES_ARENA"));
|
||
if (argc > 1 && !strcmp (argv[1], "--help")) return puts ("Usage: mes < FILE\n");
|
||
if (argc > 1 && !strcmp (argv[1], "--version")) return puts ("Mes 0.3\n");
|
||
g_stdin = stdin;
|
||
r0 = mes_environment ();
|
||
SCM program = (argc > 1 && !strcmp (argv[1], "--load"))
|
||
? bload_env (r0) : load_env (r0);
|
||
if (argc > 1 && !strcmp (argv[1], "--dump")) return dump ();
|
||
stderr_ (begin_env (program, r0));
|
||
fputs ("", stderr);
|
||
gc (stack);
|
||
if (g_debug) fprintf (stderr, "\nstats: [%d]\n", g_free.value);
|
||
return 0;
|
||
}
|