1267 lines
27 KiB
C
1267 lines
27 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 QUASIQUOTE 1
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#define QUASISYNTAX 0
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#define ENV_CACHE 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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typedef long SCM;
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enum type_t {CHAR, FUNCTION, MACRO, NUMBER, PAIR, SPECIAL, STRING, SYMBOL, REF, 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 {
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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;
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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;
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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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function functions[200];
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int g_function = 0;
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#include "mes.symbols.h"
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#include "define.h"
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#include "display.h"
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#include "lib.h"
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#include "math.h"
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#include "mes.h"
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#include "posix.h"
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#include "quasiquote.h"
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#include "reader.h"
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#include "string.h"
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#include "type.h"
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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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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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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_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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#if BOOT
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scm scm_label = {
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SPECIAL, "label"};
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#endif
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scm scm_begin = {SPECIAL, "*begin*"};
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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_define = {SYMBOL, "define"};
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scm scm_symbol_define_macro = {SYMBOL, "define-macro"};
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scm scm_symbol_set_x = {SYMBOL, "set!"};
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scm scm_symbol_quote = {SYMBOL, "quote"};
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scm scm_symbol_quasiquote = {SYMBOL, "quasiquote"};
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scm scm_symbol_unquote = {SYMBOL, "unquote"};
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scm scm_symbol_unquote_splicing = {SYMBOL, "unquote-splicing"};
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scm scm_symbol_sc_expand = {SYMBOL, "sc-expand"};
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scm scm_symbol_expand_macro = {SYMBOL, "expand-macro"};
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scm scm_symbol_sc_expander_alist = {SYMBOL, "*sc-expander-alist*"};
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scm scm_symbol_noexpand = {SYMBOL, "noexpand"};
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scm scm_symbol_syntax = {SYMBOL, "syntax"};
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scm scm_symbol_quasisyntax = {SYMBOL, "quasisyntax"};
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scm scm_symbol_unsyntax = {SYMBOL, "unsyntax"};
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scm scm_symbol_unsyntax_splicing = {SYMBOL, "unsyntax-splicing"};
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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_the_unquoters = {SYMBOL, "*the-unquoters*"};
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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 char_eof = {CHAR, .name="*eof*", .value=-1};
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scm char_nul = {CHAR, .name="nul", .value=0};
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scm char_backspace = {CHAR, .name="backspace", .value=8};
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scm char_tab = {CHAR, .name="tab", .value=9};
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scm char_newline = {CHAR, .name="newline", .value=10};
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scm char_vt = {CHAR, .name="vt", .value=11};
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scm char_page = {CHAR, .name="page", .value=12};
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scm char_return = {CHAR, .name="return", .value=13};
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scm char_space = {CHAR, .name="space", .value=32};
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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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#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 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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SCM display_ (FILE* f, SCM x);
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SCM vm_call (function0_t f, SCM p1, SCM p2, SCM a);
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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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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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assert (TYPE (x) == PAIR);
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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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assert (TYPE (x) == PAIR);
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return 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) == 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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assert (TYPE (x) == PAIR);
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CDR (x) = e;
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return cell_unspecified;
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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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return set_cdr_x (p, e);
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}
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SCM
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quote (SCM x)
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{
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return cons (cell_symbol_quote, x);
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}
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SCM
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quasiquote (SCM x)
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{
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return cons (cell_symbol_quasiquote, x);
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}
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SCM
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quasisyntax (SCM x)
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{
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return cons (cell_symbol_quasisyntax, x);
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}
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SCM
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pairlis (SCM x, SCM y, SCM a)
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{
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if (x == cell_nil)
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return a;
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if (pair_p (x) == cell_f)
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return cons (cons (x, y), a);
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return cons (cons (car (x), car (y)),
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pairlis (cdr (x), cdr (y), a));
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}
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SCM
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assq (SCM x, SCM a)
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{
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while (a != cell_nil && eq_p (x, CAAR (a)) == cell_f)
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{
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if (TYPE (a) == BROKEN_HEART || TYPE (CAR (a)) == BROKEN_HEART)
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fprintf (stderr, "oops, broken heart\n");
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a = CDR (a);
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}
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return a != cell_nil ? car (a) : cell_f;
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}
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SCM
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assq_ref_cache (SCM x, SCM a)
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{
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x = assq (x, a);
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if (x == cell_f) return cell_undefined;
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return cdr (x);
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}
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SCM
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assert_defined (SCM x, SCM e)
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{
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if (e == cell_undefined)
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{
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fprintf (stderr, "eval: unbound variable:");
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display_ (stderr, x);
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fprintf (stderr, "\n");
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assert (!"unbound variable");
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}
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return e;
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}
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SCM
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vm_evlis_env ()
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{
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if (r1 == cell_nil) return cell_nil;
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if (TYPE (r1) != PAIR) return eval_env (r1, r0);
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r2 = eval_env (car (r1), r0);
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r1 = evlis_env (cdr (r1), r0);
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return cons (r2, r1);
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}
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SCM
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vm_call_lambda ()
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{
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return vm_call (vm_begin_env, r1, cell_undefined, r0);
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}
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SCM
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call_lambda (SCM e, SCM x, SCM aa, SCM a) ///((internal))
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{
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SCM cl = cons (cons (cell_closure, x), x);
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r1 = e;
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r0 = cl;
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r2 = a;
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r3 = aa;
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return vm_call_lambda ();
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}
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SCM
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vm_apply_env ()
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{
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if (TYPE (r1) != PAIR)
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{
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if (TYPE (r1) == FUNCTION) return call (r1, r2);
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if (r1 == cell_symbol_call_with_values)
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return call_with_values_env (car (r2), cadr (r2), r0);
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if (r1 == cell_symbol_current_module) return r0;
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}
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else if (car (r1) == cell_symbol_lambda) {
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SCM args = cadr (r1);
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SCM body = cddr (r1);
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SCM p = pairlis (args, r2, r0);
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return call_lambda (body, p, p, r0);
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}
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else if (car (r1) == cell_closure) {
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SCM args = caddr (r1);
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SCM body = cdddr (r1);
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SCM aa = cdadr (r1);
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aa = cdr (aa);
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SCM p = pairlis (args, r2, aa);
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return call_lambda (body, p, aa, r0);
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}
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#if BOOT
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else if (car (r1) == cell_symbol_label)
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return apply_env (caddr (r1), r2, cons (cons (cadr (r1), caddr (r1)), r0));
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#endif
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SCM e = eval_env (r1, r0);
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char const* type = 0;
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if (e == cell_f || e == cell_t) type = "bool";
|
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if (TYPE (e) == CHAR) type = "char";
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if (TYPE (e) == NUMBER) type = "number";
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if (TYPE (e) == STRING) type = "string";
|
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if (e == cell_unspecified) type = "*unspecified*";
|
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if (e == cell_undefined) type = "*undefined*";
|
||
if (type)
|
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{
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fprintf (stderr, "cannot apply: %s: ", type);
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display_ (stderr, e);
|
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fprintf (stderr, " [");
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||
display_ (stderr, r1);
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||
fprintf (stderr, "]\n");
|
||
assert (!"cannot apply");
|
||
}
|
||
return apply_env (e, r2, r0);
|
||
}
|
||
|
||
SCM
|
||
vm_eval_env ()
|
||
{
|
||
switch (TYPE (r1))
|
||
{
|
||
case PAIR:
|
||
{
|
||
#if FIXED_PRIMITIVES
|
||
if (car (r1) == cell_symbol_car)
|
||
return car (eval_env (CADR (r1), r0));
|
||
if (car (r1) == cell_symbol_cdr)
|
||
return cdr (eval_env (CADR (r1), r0));
|
||
if (car (r1) == cell_symbol_cons) {
|
||
SCM m = evlis_env (CDR (r1), r0);
|
||
return cons (CAR (m), CADR (m));
|
||
}
|
||
if (car (r1) == cell_symbol_null_p)
|
||
return null_p (eval_env (CADR (r1), r0));
|
||
#endif // FIXED_PRIMITIVES
|
||
if (car (r1) == cell_symbol_quote)
|
||
return cadr (r1);
|
||
#if QUASISYNTAX
|
||
if (car (r1) == cell_symbol_syntax)
|
||
return r1;
|
||
#endif
|
||
if (car (r1) == cell_symbol_begin)
|
||
return begin_env (r1, r0);
|
||
if (car (r1) == cell_symbol_lambda)
|
||
return make_closure (cadr (r1), cddr (r1), assq (cell_closure, r0));
|
||
if (car (r1) == cell_closure)
|
||
return r1;
|
||
if (car (r1) == cell_symbol_if)
|
||
return if_env (cdr (r1), r0);
|
||
#if !BOOT
|
||
if (car (r1) == cell_symbol_define)
|
||
return define_env (r1, r0);
|
||
if (car (r1) == cell_symbol_define_macro)
|
||
return define_env (r1, r0);
|
||
if (car (r1) == cell_symbol_primitive_load)
|
||
return begin_env (read_input_file_env (r0), r0);
|
||
#else
|
||
if (car (r1) == cell_symbol_define) {
|
||
fprintf (stderr, "C DEFINE: ");
|
||
display_ (stderr,
|
||
TYPE (cadr (r1)) == SYMBOL
|
||
? STRING (cadr (r1))
|
||
: STRING (caadr (r1)));
|
||
fprintf (stderr, "\n");
|
||
}
|
||
assert (car (r1) != cell_symbol_define);
|
||
assert (car (r1) != cell_symbol_define_macro);
|
||
#endif
|
||
#if 1 //!BOOT
|
||
if (car (r1) == cell_symbol_set_x)
|
||
{
|
||
SCM x = eval_env (caddr (r1), r0);
|
||
return set_env_x (cadr (r1), x, r0);
|
||
}
|
||
#else
|
||
assert (car (r1) != cell_symbol_set_x);
|
||
#endif
|
||
#if QUASIQUOTE
|
||
if (car (r1) == cell_symbol_unquote)
|
||
return eval_env (cadr (r1), r0);
|
||
if (car (r1) == cell_symbol_quasiquote)
|
||
return eval_quasiquote (cadr (r1), add_unquoters (r0));
|
||
#endif //QUASIQUOTE
|
||
#if QUASISYNTAX
|
||
if (car (r1) == cell_symbol_unsyntax)
|
||
return eval_env (cadr (r1), r0);
|
||
if (car (r1) == cell_symbol_quasisyntax)
|
||
return eval_quasisyntax (cadr (r1), add_unsyntaxers (r0));
|
||
#endif //QUASISYNTAX
|
||
SCM x = expand_macro_env (r1, r0);
|
||
if (x != r1)
|
||
return eval_env (x, r0);
|
||
SCM m = evlis_env (CDR (r1), r0);
|
||
return apply_env (car (r1), m, r0);
|
||
}
|
||
case SYMBOL: return assert_defined (r1, assq_ref_cache (r1, r0));
|
||
default: return r1;
|
||
}
|
||
}
|
||
|
||
SCM
|
||
vm_expand_macro_env ()
|
||
{
|
||
if (TYPE (CAR (r1)) == STRING && string_to_symbol (CAR (r1)) == cell_symbol_noexpand)
|
||
return cadr (r1);
|
||
|
||
SCM macro;
|
||
SCM expanders;
|
||
if (TYPE (r1) == PAIR
|
||
&& (macro = lookup_macro (car (r1), r0)) != cell_f)
|
||
return apply_env (macro, CDR (r1), r0);
|
||
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_expand_macro, r0);
|
||
if (sc_expand != cell_undefined && sc_expand != cell_f)
|
||
r1 = apply_env (sc_expand, cons (r1, cell_nil), r0);
|
||
}
|
||
return r1;
|
||
}
|
||
|
||
SCM
|
||
vm_begin_env ()
|
||
{
|
||
SCM r = cell_unspecified;
|
||
while (r1 != cell_nil) {
|
||
if (TYPE (r1) == PAIR && TYPE (CAR (r1)) == PAIR && caar (r1) == cell_symbol_begin)
|
||
r1 = append2 (cdar (r1), cdr (r1));
|
||
r = eval_env (car (r1), r0);
|
||
r1 = CDR (r1);
|
||
}
|
||
return r;
|
||
}
|
||
|
||
SCM
|
||
vm_if_env ()
|
||
{
|
||
SCM x = eval_env (car (r1), r0);
|
||
if (x != cell_f)
|
||
return eval_env (cadr (r1), r0);
|
||
if (cddr (r1) != cell_nil)
|
||
return eval_env (caddr (r1), r0);
|
||
return cell_unspecified;
|
||
}
|
||
|
||
SCM
|
||
vm_call_with_values_env ()
|
||
{
|
||
SCM v = apply_env (r1, cell_nil, r0);
|
||
if (TYPE (v) == VALUES)
|
||
v = CDR (v);
|
||
return apply_env (r2, v, r0);
|
||
}
|
||
|
||
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)
|
||
{
|
||
return vm_call (vm_evlis_env, m, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
apply_env (SCM fn, SCM x, SCM a)
|
||
{
|
||
return vm_call (vm_apply_env, fn, x, a);
|
||
}
|
||
|
||
SCM
|
||
eval_env (SCM e, SCM a)
|
||
{
|
||
return vm_call (vm_eval_env, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
expand_macro_env (SCM e, SCM a)
|
||
{
|
||
return vm_call (vm_expand_macro_env, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
begin_env (SCM e, SCM a)
|
||
{
|
||
return vm_call (vm_begin_env, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
if_env (SCM e, SCM a)
|
||
{
|
||
return vm_call (vm_if_env, e, cell_undefined, a);
|
||
}
|
||
|
||
SCM
|
||
call_with_values_env (SCM producer, SCM consumer, SCM a)
|
||
{
|
||
return vm_call (vm_call_with_values_env, 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;
|
||
return append2 (car (x), append (cdr (x)));
|
||
}
|
||
|
||
SCM
|
||
make_char (int x)
|
||
{
|
||
g_cells[tmp_num].value = CHAR;
|
||
g_cells[tmp_num2].value = x;
|
||
return make_cell (tmp_num, tmp_num2, tmp_num2);
|
||
}
|
||
|
||
SCM
|
||
make_function (SCM name, SCM id, SCM arity)
|
||
{
|
||
g_cells[tmp_num3].value = FUNCTION;
|
||
function *f = (function*)malloc (sizeof (function));
|
||
f->arity = VALUE (arity);
|
||
g_cells[tmp_num4].value = (long)f;
|
||
return make_cell (tmp_num3, name, tmp_num4);
|
||
}
|
||
|
||
SCM
|
||
make_macro (SCM name, SCM x)
|
||
{
|
||
g_cells[tmp_num].value = MACRO;
|
||
return make_cell (tmp_num, STRING (name), x);
|
||
}
|
||
|
||
SCM
|
||
make_number (int x)
|
||
{
|
||
g_cells[tmp_num].value = NUMBER;
|
||
g_cells[tmp_num2].value = x;
|
||
return make_cell (tmp_num, tmp_num2, tmp_num2);
|
||
}
|
||
|
||
SCM
|
||
make_ref (SCM x)
|
||
{
|
||
g_cells[tmp_num].value = REF;
|
||
return make_cell (tmp_num, x, x);
|
||
}
|
||
|
||
SCM
|
||
make_string (SCM x)
|
||
{
|
||
g_cells[tmp_num].value = STRING;
|
||
return make_cell (tmp_num, x, 0);
|
||
}
|
||
|
||
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
|
||
internal_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 = internal_lookup_symbol (s);
|
||
return x ? x : internal_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
|
||
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;
|
||
}
|
||
|
||
FILE *g_stdin;
|
||
int
|
||
getchar ()
|
||
{
|
||
return getc (g_stdin);
|
||
}
|
||
|
||
int
|
||
ungetchar (int c)
|
||
{
|
||
return ungetc (c, g_stdin);
|
||
}
|
||
|
||
int
|
||
peekchar ()
|
||
{
|
||
int c = getchar ();
|
||
ungetchar (c);
|
||
return c;
|
||
}
|
||
|
||
SCM
|
||
peek_byte ()
|
||
{
|
||
return make_number (peekchar ());
|
||
}
|
||
|
||
SCM
|
||
read_byte ()
|
||
{
|
||
return make_number (getchar ());
|
||
}
|
||
|
||
SCM
|
||
unread_byte (SCM i)
|
||
{
|
||
return ungetchar (VALUE (i));
|
||
}
|
||
|
||
SCM
|
||
write_char (SCM x) ///((arity . n))
|
||
{
|
||
SCM c = car (x);
|
||
SCM p = cdr (x);
|
||
int fd = 1;
|
||
if (TYPE (p) == PAIR && TYPE (car (p)) == NUMBER) fd = VALUE (car (p));
|
||
FILE *f = fd == 1 ? stdout : stderr;
|
||
assert (TYPE (c) == NUMBER || TYPE (c) == CHAR);
|
||
fputc (VALUE (c), f);
|
||
return c;
|
||
}
|
||
|
||
SCM
|
||
symbol_to_list (SCM x)
|
||
{
|
||
assert (TYPE (x) == SYMBOL);
|
||
return STRING (x);
|
||
}
|
||
|
||
SCM
|
||
char_to_integer (SCM x)
|
||
{
|
||
assert (TYPE (x) == CHAR);
|
||
return make_number (VALUE (x));
|
||
}
|
||
|
||
SCM
|
||
integer_to_char (SCM x)
|
||
{
|
||
assert (TYPE (x) == NUMBER);
|
||
return make_char (VALUE (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)
|
||
{
|
||
if (g_debug) fprintf (stderr, "cannot up arena: %s: arena=%d\n", strerror (errno), 2*ARENA_SIZE);
|
||
return cell_unspecified;
|
||
}
|
||
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) == 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) == 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;
|
||
}
|
||
|
||
SCM
|
||
gc_show ()
|
||
{
|
||
fprintf (stderr, "cells: ");
|
||
scm *t = g_cells;
|
||
display_ (stderr, -1);
|
||
fprintf (stderr, "\n");
|
||
if (g_news)
|
||
{
|
||
fprintf (stderr, "news: ");
|
||
g_cells = g_news;
|
||
display_ (stderr, -1);
|
||
fprintf (stderr, "\n");
|
||
}
|
||
g_cells = t;
|
||
return cell_unspecified;
|
||
}
|
||
|
||
// Environment setup
|
||
SCM
|
||
acons (SCM key, SCM value, SCM alist)
|
||
{
|
||
return cons (cons (key, value), alist);
|
||
}
|
||
|
||
SCM
|
||
add_environment (SCM a, char const *name, SCM x)
|
||
{
|
||
return acons (make_symbol (cstring_to_list (name)), x, a);
|
||
}
|
||
|
||
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';
|
||
g_free.value = 1; // 0 is tricky
|
||
}
|
||
|
||
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;
|
||
|
||
#if BOOT
|
||
a = acons (cell_symbol_label, cell_t, a);
|
||
#endif
|
||
a = acons (cell_symbol_begin, cell_begin, a);
|
||
a = add_environment (a, "sc-expand", cell_f);
|
||
a = acons (cell_closure, a, a);
|
||
|
||
internal_lookup_symbol (cell_nil);
|
||
|
||
return a;
|
||
}
|
||
|
||
SCM
|
||
mes_builtins (SCM a)
|
||
{
|
||
#include "mes.i"
|
||
|
||
#include "define.i"
|
||
#include "display.i"
|
||
#include "lib.i"
|
||
#include "math.i"
|
||
#include "posix.i"
|
||
#include "quasiquote.i"
|
||
#include "reader.i"
|
||
#include "string.i"
|
||
#include "type.i"
|
||
|
||
#include "define.environment.i"
|
||
#include "display.environment.i"
|
||
#include "lib.environment.i"
|
||
#include "math.environment.i"
|
||
#include "mes.environment.i"
|
||
#include "posix.environment.i"
|
||
//#include "quasiquote.environment.i"
|
||
#include "reader.environment.i"
|
||
#include "string.environment.i"
|
||
#include "type.environment.i"
|
||
|
||
SCM cell_unquote = assq_ref_cache (cell_symbol_unquote, a);
|
||
SCM cell_unquote_splicing = assq_ref_cache (cell_symbol_unquote_splicing, a);
|
||
SCM the_unquoters = cons (cons (cell_symbol_unquote, cell_unquote),
|
||
cons (cons (cell_symbol_unquote_splicing, cell_unquote_splicing),
|
||
cell_nil));
|
||
a = acons (cell_symbol_the_unquoters, the_unquoters, a);
|
||
|
||
a = add_environment (a, "*foo-bar-baz*", cell_nil); // FIXME: some off-by one?
|
||
|
||
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_lambda (SCM args, SCM body)
|
||
{
|
||
return cons (cell_symbol_lambda, cons (args, body));
|
||
}
|
||
|
||
SCM
|
||
make_closure (SCM args, SCM body, SCM a)
|
||
{
|
||
return cons (cell_closure, 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 (macro_p (m) == cell_t) return MACRO (m);
|
||
return cell_f;
|
||
}
|
||
|
||
SCM
|
||
read_input_file_env_ (SCM e, SCM a)
|
||
{
|
||
if (e == cell_nil) return e;
|
||
return cons (e, read_input_file_env_ (read_env (a), a));
|
||
}
|
||
|
||
SCM
|
||
read_input_file_env (SCM a)
|
||
{
|
||
return read_input_file_env_ (read_env (r0), r0);
|
||
}
|
||
|
||
bool g_dump_p = false;
|
||
|
||
SCM
|
||
load_env (SCM a)
|
||
{
|
||
r3 = read_input_file_env (r0);
|
||
if (g_dump_p && !g_function)
|
||
{
|
||
r1 = g_symbols;
|
||
SCM frame = cons (r1, cons (r2, cons (r3, cons (r0, cell_nil))));
|
||
stack = cons (frame, stack);
|
||
stack = gc (stack);
|
||
gc_frame (stack);
|
||
char *p = (char*)g_cells;
|
||
fputc ('M', stdout);
|
||
fputc ('E', stdout);
|
||
fputc ('S', stdout);
|
||
fputc (stack >> 8, stdout);
|
||
fputc (stack % 256, stdout);
|
||
for (int i=0; i<g_free.value * sizeof(scm); i++)
|
||
fputc (*p++, stdout);
|
||
return 0;
|
||
}
|
||
if (!g_function)
|
||
r0 = mes_builtins (r0);
|
||
return begin_env (r3, r0);
|
||
}
|
||
|
||
SCM
|
||
bload_env (SCM a)
|
||
{
|
||
g_stdin = fopen ("read-0.mo", "r");
|
||
char *p = (char*)g_cells;
|
||
assert (getchar () == 'M');
|
||
assert (getchar () == 'E');
|
||
assert (getchar () == 'S');
|
||
stack = getchar () << 8;
|
||
stack += getchar ();
|
||
int c = getchar ();
|
||
while (c != EOF)
|
||
{
|
||
*p++ = c;
|
||
c = getchar ();
|
||
}
|
||
g_free.value = (p-(char*)g_cells) / sizeof (scm);
|
||
gc_frame (stack);
|
||
g_symbols = r1;
|
||
g_stdin = stdin;
|
||
|
||
r0 = mes_builtins (r0);
|
||
|
||
return begin_env (r3, r0);
|
||
}
|
||
|
||
#include "type.c"
|
||
#include "define.c"
|
||
#include "display.c"
|
||
#include "lib.c"
|
||
#include "math.c"
|
||
#include "posix.c"
|
||
#include "quasiquote.c"
|
||
#include "reader.c"
|
||
#include "string.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], "--dump")) g_dump_p = true;
|
||
if (argc > 1 && !strcmp (argv[1], "--help")) return puts ("Usage: mes < FILE\n");
|
||
if (argc > 1 && !strcmp (argv[1], "--version")) return puts ("Mes 0.2\n");
|
||
g_stdin = stdin;
|
||
SCM a = mes_environment ();
|
||
if (argc > 1 && !strcmp (argv[1], "--load"))
|
||
display_ (stderr, bload_env (a));
|
||
else
|
||
display_ (stderr, load_env (a));
|
||
fputs ("", stderr);
|
||
gc (stack);
|
||
if (g_debug) fprintf (stderr, "\nstats: [%d]\n", g_free.value);
|
||
return 0;
|
||
}
|