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mlis2.c
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/* MonoLis (minimam Lisp interpreter)
written by kenichi sasagawa 2016/3
special thanks to Tsuyoshi Uema
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <setjmp.h>
#include "mlis2.h"
cell heap[HEAPSIZE];
int stack[STACKSIZE];
int argstk[STACKSIZE];
token stok = {GO,OTHER};
jmp_buf buf;
int cell_hash_table[HASHTBSIZE];
int main(void){
printf("MonoLis Ver0.02\n");
initcell();
initsubr();
int ret = setjmp(buf);
repl:
if(ret == 0)
while(1){
printf("> "); fflush(stdout); fflush(stdin);
print(eval(read ()));
printf("\n"); fflush(stdout);
}
else
if(ret == 1){
ret = 0;
goto repl;
}
else
return 0;
}
//-----------------------------
void initcell(void){
int addr,x;
for(addr=0; addr < HEAPSIZE; addr++){
heap[addr].flag = FRE;
heap[addr].cdr = addr+1;
}
hp = 0;
fc = HEAPSIZE;
for(x=0; x<HASHTBSIZE; x++)
cell_hash_table[x] = NIL;
//0番地はnil、環境レジスタを設定する。初期環境
ep = makesym("nil");
assocsym(makesym("nil"),NIL);
assocsym(makesym("t"),makesym("t"));
sp = 0;
ap = 0;
}
int freshcell(void){
int res;
res = hp;
hp = heap[hp].cdr;
SET_CDR(res,0);
fc--;
return(res);
}
//deep-bindによる。シンボルが見つからなかったら登録。
//見つかったらそこに値をいれておく。
void bindsym(int sym, int val){
int addr;
addr= assoc(sym,ep);
if(addr == 0)
assocsym(sym,val);
else
SET_CDR(addr,val);
}
//変数の束縛
//ローカル変数の場合は以前の束縛に積み上げていく。
//したがって同じ変数名があったとしても書き変えない。
void assocsym(int sym, int val){
ep = cons(cons(sym,val),ep);
}
//環境は次のように連想リストになっている。
// env = ((sym1 . val1) (sym2 . val2) ...(t . t)(nil . 0))
// assocでシンボルに対応する値を探す。
//見つからなかった場合には-1を返す。
int findsym(int sym){
int addr;
addr = assoc(sym,ep);
if(addr == 0)
return(-1);
else
return(cdr(addr));
}
//シンボルの唯一性を確保するためのもの
int getsym(char *name, int index){
int addr;
addr = cell_hash_table[index];
while(addr != NIL){
if(strcmp(name,GET_NAME(car(addr))) == 0)
return(car(addr));
else
addr = cdr(addr);
}
return(0);
}
int addsym(char *name, int index){
int addr,res;
addr = cell_hash_table[index];
addr = cons(res=makesym1(name),addr);
cell_hash_table[index] = addr;
return(res);
}
int makesym1(char *name){
int addr;
addr = freshcell();
SET_TAG(addr,SYM);
SET_NAME(addr,name);
return(addr);
}
int hash(char *name){
int res;
res = 0;
while(*name != NUL){
res = res + (int)*name;
name++;
}
return(res % HASHTBSIZE);
}
//-------デバッグ用------------------
void cellprint(int addr){
switch(GET_FLAG(addr)){
case FRE: printf("FRE "); break;
case USE: printf("USE "); break;
}
switch(GET_TAG(addr)){
case EMP: printf("EMP "); break;
case NUM: printf("NUM "); break;
case SYM: printf("SYM "); break;
case LIS: printf("LIS "); break;
case SUBR: printf("SUBR "); break;
case FSUBR: printf("FSUBR "); break;
case FUNC: printf("FUNC "); break;
case MACRO: printf("MACRO "); break;
}
printf("%07d ", GET_CAR(addr));
printf("%07d ", GET_CDR(addr));
printf("%07d ", GET_BIND(addr));
printf("%s \n", GET_NAME(addr));
}
//ヒープダンプ
void heapdump(int start, int end){
int i;
printf("addr F TAG CAR CDR BIND NAME\n");
for(i=start; i<= end; i++){
printf("%07d ", i);
cellprint(i);
}
}
//---------ガベージコレクション-----------
void gbc(void){
int addr;
printf("enter GBC free=%d\n", fc); fflush(stdout);
gbcmark();
gbcsweep();
fc = 0;
for(addr=0; addr < HEAPSIZE; addr++)
if(IS_EMPTY(addr))
fc++;
printf("exit GBC free=%d\n", fc); fflush(stdout);
}
void markoblist(void){
int addr;
addr = ep;
while(!(nullp(addr))){
MARK_CELL(addr);
addr = cdr(addr);
}
MARK_CELL(0);
}
void markcell(int addr){
if(USED_CELL(addr))
return;
MARK_CELL(addr);
if(car(addr) != 0)
markcell(car(addr));
if(cdr(addr) != 0)
markcell(cdr(addr));
if((GET_BIND(addr) != 0) && IS_FUNC(addr))
markcell(GET_BIND(addr));
if((GET_BIND(addr) != 0) && IS_MACRO(addr))
markcell(GET_BIND(addr));
}
void gbcmark(void){
int addr, i;
//oblistをマークする。
markoblist();
//oblistからつながっているcellをマークする。
addr = ep;
while(!(nullp(addr))){
markcell(car(addr));
addr = cdr(addr);
}
//argstackからbindされているcellをマークする。
for(i = 0; i < ap; i++)
markcell(argstk[i]);
//シンボルハッシュテーブルにつながっているcellをマークする。
for(i = 0; i < HASHTBSIZE; i++)
markcell(cell_hash_table[i]);
}
void gbcsweep(void){
int addr;
addr = 0;
while(addr < HEAPSIZE){
if(USED_CELL(addr))
NOMARK_CELL(addr);
else{
clrcell(addr);
SET_CDR(addr,hp);
hp = addr;
}
addr++;
}
}
void clrcell(int addr){
SET_TAG(addr,EMP);
free(heap[addr].name);
heap[addr].name = NULL;
SET_CAR(addr,0);
SET_CDR(addr,0);
SET_BIND(addr,0);
}
//自由セルが一定数を下回った場合にはgbcを起動する。
void checkgbc(void){
if(fc < FREESIZE)
gbc();
}
//--------------リスト操作---------------------
int car(int addr){
return(GET_CAR(addr));
}
int caar(int addr){
return(car(car(addr)));
}
int cdar(int addr){
return(cdr(car(addr)));
}
int cdr(int addr){
return(GET_CDR(addr));
}
int cadr(int addr){
return(car(cdr(addr)));
}
int caddr(int addr){
return(car(cdr(cdr(addr))));
}
int cadar(int addr){
return(car(cdr(car(addr))));
}
int cons(int car, int cdr){
int addr;
addr = freshcell();
SET_TAG(addr,LIS);
SET_CAR(addr,car);
SET_CDR(addr,cdr);
return(addr);
}
int assoc(int sym, int lis){
if(nullp(lis))
return(0);
else if(eqp(sym, caar(lis)))
return(car(lis));
else
return(assoc(sym,cdr(lis)));
}
int length(int addr){
int len = 0;
while(!(nullp(addr))){
len++;
addr = cdr(addr);
}
return(len);
}
int list(int arglist){
if(nullp(arglist))
return(NIL);
else
return(cons(car(arglist),list(cdr(arglist))));
}
int append(int x, int y){
if(nullp(x))
return(y);
else
return(cons(car(x),append(cdr(x),y)));
}
//----------------------------------------
int makenum(int num){
int addr;
addr = freshcell();
SET_TAG(addr,NUM);
SET_NUMBER(addr,num);
return(addr);
}
int makesym(char *name){
int index,res;
index = hash(name);
if((res=getsym(name, index)) != 0)
return(res);
else
return(addsym(name,index));
}
//スタック。ep環境ポインタの保存用
void push(int pt){
stack[sp++] = pt;
}
int pop(void){
return(stack[--sp]);
}
//arglistスタックのpush/pop
void argpush(int addr){
argstk[ap++] = addr;
}
void argpop(void){
--ap;
}
//-------read()--------
void gettoken(void){
char c;
int pos;
if(stok.flag == BACK){
stok.flag = GO;
return;
}
if(stok.ch == ')'){
stok.type = RPAREN;
stok.ch = NUL;
return;
}
if(stok.ch == '('){
stok.type = LPAREN;
stok.ch = NUL;
return;
}
c = getchar();
while((c == SPACE) || (c == EOL) || (c == TAB))
c=getchar();
switch(c){
case '(': stok.type = LPAREN; break;
case ')': stok.type = RPAREN; break;
case '\'': stok.type = QUOTE; break;
case '.': stok.type = DOT; break;
case '`': stok.type = BACKQUOTE; break;
case ',': stok.type = COMMA; break;
case '@': stok.type = ATMARK; break;
default: {
pos = 0; stok.buf[pos++] = c;
while(((c=getchar()) != EOL) && (pos < BUFSIZE) &&
(c != SPACE) && (c != '(') && (c != ')') &&
(c != '`') && (c != ',') && (c != '@'))
stok.buf[pos++] = c;
stok.buf[pos] = NUL;
stok.ch = c;
if(numbertoken(stok.buf)){
stok.type = NUMBER;
break;
}
if(symboltoken(stok.buf)){
stok.type = SYMBOL;
break;
}
stok.type = OTHER;
}
}
}
int numbertoken(char buf[]){
int i;
char c;
if(((buf[0] == '+') || (buf[0] == '-'))){
if(buf[1] == NUL)
return(0); // case {+,-} => symbol
i = 1;
while((c=buf[i]) != NUL)
if(isdigit(c))
i++; // case {+123..., -123...}
else
return(0);
}
else {
i = 0; // {1234...}
while((c=buf[i]) != NUL)
if(isdigit(c))
i++;
else
return(0);
}
return(1);
}
int symboltoken(char buf[]){
int i;
char c;
if(isdigit(buf[0]))
return(0);
i = 0;
while((c=buf[i]) != NUL)
if((isalpha(c)) || (isdigit(c)) || (issymch(c)))
i++;
else
return(0);
return(1);
}
int issymch(char c){
switch(c){
case '!':
case '?':
case '+':
case '-':
case '*':
case '/':
case '=':
case '<':
case '>': return(1);
default: return(0);
}
}
int read(void){
gettoken();
switch(stok.type){
case NUMBER: return(makenum(atoi(stok.buf)));
case SYMBOL: return(makesym(stok.buf));
case QUOTE: return(cons(makesym("quote"), cons(read(),NIL)));
case BACKQUOTE: return(cons(makesym("quasi-quote"), cons(read(),NIL)));
case COMMA: {gettoken();
if(stok.type == ATMARK)
return(cons(makesym("unquote-splicing"), cons(read(),NIL)));
else{
stok.flag = BACK;
return(cons(makesym("unquote"), cons(read(),NIL)));
}
}
case LPAREN: return(readlist());
default: break;
}
error(CANT_READ_ERR,"read",NIL);
return(0);
}
int readlist(void){
int car,cdr;
gettoken();
if(stok.type == RPAREN)
return(NIL);
else
if(stok.type == DOT){
cdr = read();
if(atomp(cdr))
gettoken();
return(cdr);
}
else{
stok.flag = BACK;
car = read();
cdr = readlist();
return(cons(car,cdr));
}
}
//-----print------------------
void print(int addr){
switch(GET_TAG(addr)){
case NUM: printf("%d", GET_NUMBER(addr)); break;
case SYM: printf("%s", GET_NAME(addr)); break;
case SUBR: printf("<subr>"); break;
case FSUBR: printf("<fsubr>"); break;
case FUNC: printf("<function>"); break;
case MACRO: printf("<macro>");break;
case LIS: { printf("(");
printlist(addr); break;}
default: printf("<undef>"); break;
}
}
void printlist(int addr){
if(IS_NIL(addr))
printf(")");
else
if((!(listp(cdr(addr)))) && (! (nullp(cdr(addr))))){
print(car(addr));
printf(" . ");
print(cdr(addr));
printf(")");
}
else {
print(GET_CAR(addr));
if(! (IS_NIL(GET_CDR(addr))))
printf(" ");
printlist(GET_CDR(addr));
}
}
//--------eval---------------
int eval(int addr){
int res;
if(atomp(addr)){
if(numberp(addr))
return(addr);
if(symbolp(addr)){
res = findsym(addr);
if(res == -1)
error(CANT_FIND_ERR, "eval", addr);
else
return(res);
}
}
else
if(listp(addr)){
if((symbolp(car(addr))) &&(HAS_NAME(car(addr),"quote")))
return(cadr(addr));
if((symbolp(car(addr))) &&(HAS_NAME(car(addr),"quasi-quote")))
return(eval(quasi_transfer2(cadr(addr),0)));
if(numberp(car(addr)))
error(ARG_SYM_ERR, "eval", addr);
if(subrp(car(addr)))
return(apply(car(addr),evlis(cdr(addr))));
if(fsubrp(car(addr)))
return(apply(car(addr),cdr(addr)));
if(functionp(car(addr)))
return(apply(car(addr),evlis(cdr(addr))));
if(macrop(car(addr)))
return(apply(car(addr),cdr(addr)));
}
error(CANT_FIND_ERR, "eval", addr);
return(0);
}
int apply(int func, int args){
int symaddr,varlist,body,res,macrofunc;
symaddr = findsym(func);
if(symaddr == -1)
error(CANT_FIND_ERR, "apply", func);
else {
switch(GET_TAG(symaddr)){
case SUBR: return((GET_SUBR(symaddr))(args));
case FSUBR: return((GET_SUBR(symaddr))(args));
case FUNC: { varlist = car(GET_BIND(symaddr));
body = cdr(GET_BIND(symaddr));
bindarg(varlist,args);
while(!(IS_NIL(body))){
res = eval(car(body));
body = cdr(body);
}
unbind();
return(res); }
case MACRO: { macrofunc = GET_BIND(symaddr);
varlist = car(GET_BIND(macrofunc));
body = cdr(GET_BIND(macrofunc));
bindarg(varlist,args);
while(!(IS_NIL(body))){
res = eval(car(body));
body = cdr(body);
}
unbind();
res = eval(res);
return(res);
}
default: error(ILLEGAL_OBJ_ERR, "apply", symaddr);
}
}
return(0);
}
void bindarg(int varlist, int arglist){
int arg1,arg2;
push(ep);
while(!(IS_NIL(varlist))){
arg1 = car(varlist);
arg2 = car(arglist);
assocsym(arg1,arg2);
varlist = cdr(varlist);
arglist = cdr(arglist);
}
}
void unbind(void){
ep = pop();
}
int evlis(int addr){
int car_addr,cdr_addr;
argpush(addr);
checkgbc();
if(IS_NIL(addr)){
argpop();
return(addr);
}
else{
car_addr = eval(car(addr));
argpush(car_addr);
cdr_addr = evlis(cdr(addr));
argpop();
argpop();
return(cons(car_addr,cdr_addr));
}
}
int atomp(int addr){
if((IS_NUMBER(addr)) || (IS_SYMBOL(addr)))
return(1);
else
return(0);
}
int numberp(int addr){
if(IS_NUMBER(addr))
return(1);
else
return(0);
}
int symbolp(int addr){
if(IS_SYMBOL(addr))
return(1);
else
return(0);
}
int listp(int addr){
if(IS_LIST(addr) || IS_NIL(addr))
return(1);
else
return(0);
}
int nullp(int addr){
if(IS_NIL(addr))
return(1);
else
return(0);
}
int eqp(int addr1, int addr2){
if(addr1 == addr2)
return(1);
else if((numberp(addr1)) && (numberp(addr2))
&& ((GET_NUMBER(addr1)) == (GET_NUMBER(addr2))))
return(1);
else if ((symbolp(addr1)) && (symbolp(addr2))
&& (SAME_NAME(addr1,addr2)))
return(1);
else
return(0);
}
int subrp(int addr){
int val;
val = findsym(addr);
if(val != -1)
return(IS_SUBR(val));
else
return(0);
}
int fsubrp(int addr){
int val;
val = findsym(addr);
if(val != -1)
return(IS_FSUBR(val));
else
return(0);
}
int functionp(int addr){
int val;
val = findsym(addr);
if(val != -1)
return(IS_FUNC(val));
else
return(0);
}
int macrop(int addr){
int val;
val = findsym(addr);
if(val != -1)
return(IS_MACRO(val));
else
return(0);
}
//-------エラー処理------
void error(int errnum, char *fun, int arg){
switch(errnum){
case CANT_FIND_ERR:{printf("%s can't find difinition of ", fun);
print(arg); break; }
case CANT_READ_ERR:{printf("%s can't read of ", fun);
break; }
case ILLEGAL_OBJ_ERR:{printf("%s got an illegal object ", fun);
print(arg); break; }
case ARG_SYM_ERR: {printf("%s require symbol but got ", fun);
print(arg); break; }
case ARG_NUM_ERR: {printf("%s require number but got ", fun);
print(arg); break; }
case ARG_LIS_ERR: {printf("%s require list but got ", fun);
print(arg); break; }
case ARG_LEN0_ERR: {printf("%s require 0 arg but got %d", fun, length(arg));
break; }
case ARG_LEN1_ERR: {printf("%s require 1 arg but got %d", fun, length(arg));
break; }
case ARG_LEN2_ERR: {printf("%s require 2 args but got %d", fun, length(arg));
break; }
case ARG_LEN3_ERR: {printf("%s require 3 args but got %d", fun, length(arg));
break; }
case MALFORM_ERR: {printf("%s got malformed args " ,fun);
print(arg); break; }
}
printf("\n");
longjmp(buf,1);
}
void checkarg(int test, char *fun, int arg){
switch(test){
case NUMLIST_TEST: if(isnumlis(arg)) return; else error(ARG_NUM_ERR, fun, arg);
case SYMBOL_TEST: if(symbolp(arg)) return; else error(ARG_SYM_ERR, fun, arg);
case NUMBER_TEST: if(numberp(arg)) return; else error(ARG_NUM_ERR, fun, arg);
case LIST_TEST: if(listp(arg)) return; else error(ARG_LIS_ERR, fun, arg);
case LEN0_TEST: if(length(arg) == 0) return; else error(ARG_LEN0_ERR, fun, arg);
case LEN1_TEST: if(length(arg) == 1) return; else error(ARG_LEN1_ERR, fun, arg);
case LEN2_TEST: if(length(arg) == 2) return; else error(ARG_LEN2_ERR, fun, arg);
case LEN3_TEST: if(length(arg) == 3) return; else error(ARG_LEN3_ERR, fun, arg);
}
}
int isnumlis(int arg){
while(!(IS_NIL(arg)))
if(numberp(car(arg)))
arg = cdr(arg);
else
return(0);
return(1);
}
//--------組込み関数
//subrを環境に登録する。
void defsubr(char *symname, int(*func)(int)){
bindfunc(symname, SUBR, func);
}
//fsubr(引数を評価しない組込関数）の登録。
void deffsubr(char *symname, int(*func)(int)){
bindfunc(symname, FSUBR, func);
}
void bindfunc(char *name, tag tag, int(*func)(int)){
int sym,val;
sym = makesym(name);
val = freshcell();
SET_TAG(val,tag);
SET_SUBR(val,func);
SET_CDR(val,0);
bindsym(sym,val);
}
void bindfunc1(char *name, int addr){
int sym,val;
sym = makesym(name);
val = freshcell();
SET_TAG(val,FUNC);
SET_BIND(val,addr);
SET_CDR(val,0);
bindsym(sym,val);
}
void bindmacro(char *name, int addr){
int sym,val1,val2;
sym = makesym(name);
val1 = freshcell();
SET_TAG(val1,FUNC);
SET_BIND(val1,addr);
SET_CDR(val1,0);
val2 = freshcell();
SET_TAG(val2,MACRO);
SET_BIND(val2,val1);
SET_CDR(val2,0);
bindsym(sym,val2);
}
void initsubr(void){
defsubr("+",f_plus);
defsubr("-",f_minus);
defsubr("*",f_mult);
defsubr("/",f_div);
defsubr("exit",f_exit);
defsubr("hdmp",f_heapdump);
defsubr("car",f_car);
defsubr("cdr",f_cdr);
defsubr("cons",f_cons);
defsubr("list",f_list);
defsubr("append",f_append);
defsubr("eq",f_eq);
defsubr("null",f_nullp);
defsubr("atom",f_atomp);
defsubr("oblist",f_oblist);
defsubr("gbc",f_gbc);
defsubr("read",f_read);
defsubr("eval",f_eval);
defsubr("apply",f_apply);
defsubr("print",f_print);
defsubr("=",f_numeqp);
defsubr(">",f_greater);
defsubr(">=",f_eqgreater);
defsubr("<",f_smaller);
defsubr("<=",f_eqsmaller);
defsubr("numberp",f_numberp);
defsubr("symbolp",f_symbolp);
defsubr("listp",f_listp);
deffsubr("setq",f_setq);
deffsubr("defun",f_defun);
deffsubr("defmacro",f_defmacro);
deffsubr("if",f_if);
deffsubr("begin",f_begin);
deffsubr("cond",f_cond);
}
//--subr----
int f_plus(int arglist){
int arg,res;
checkarg(NUMLIST_TEST, "+", arglist);
res = 0;
while(!(IS_NIL(arglist))){
arg = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
res = res + arg;
}
return(makenum(res));
}
int f_minus(int arglist){
int arg,res;
checkarg(NUMLIST_TEST, "-", arglist);
res = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
while(!(IS_NIL(arglist))){
arg = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
res = res - arg;
}
return(makenum(res));
}
int f_mult(int arglist){
int arg,res;
checkarg(NUMLIST_TEST, "*", arglist);
res = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
while(!(IS_NIL(arglist))){
arg = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
res = res * arg;
}
return(makenum(res));
}
int f_div(int arglist){
int arg,res;
checkarg(NUMLIST_TEST, "/", arglist);
res = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
while(!(IS_NIL(arglist))){
arg = GET_NUMBER(car(arglist));
arglist = cdr(arglist);
res = res / arg;
}
return(makenum(res));