1662 lines
48 KiB
C
1662 lines
48 KiB
C
/*
|
|
femtoLisp
|
|
|
|
a minimal interpreter for a minimal lisp dialect
|
|
|
|
this lisp dialect uses lexical scope and self-evaluating lambda.
|
|
it supports 30-bit integers, symbols, conses, and full macros.
|
|
it is case-sensitive.
|
|
it features a simple compacting copying garbage collector.
|
|
it uses a Scheme-style evaluation rule where any expression may appear in
|
|
head position as long as it evaluates to a function.
|
|
it uses Scheme-style varargs (dotted formal argument lists)
|
|
lambdas can have only 1 body expression; use (begin ...) for multiple
|
|
expressions. this is due to the closure representation
|
|
(lambda args body . env)
|
|
|
|
This is a fully fleshed-out lisp built up from femtoLisp. It has all the
|
|
remaining features needed to be taken seriously:
|
|
* circular structure can be printed and read
|
|
* #. read macro for eval-when-read and correctly printing builtins
|
|
* read macros for backquote
|
|
* symbol character-escaping printer
|
|
* vectors
|
|
* exceptions
|
|
* gensyms (can be usefully read back in, too)
|
|
* #| multiline comments |#
|
|
* generic compare function, cyclic equal
|
|
* cvalues system providing C data types and a C FFI
|
|
* constructor notation for nicely printing arbitrary values
|
|
* strings
|
|
* hash tables
|
|
* I/O streams
|
|
|
|
by Jeff Bezanson (C) 2009
|
|
Distributed under the BSD License
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <setjmp.h>
|
|
#include <stdarg.h>
|
|
#include <assert.h>
|
|
#include <ctype.h>
|
|
#include <wctype.h>
|
|
#include <sys/types.h>
|
|
#include <locale.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include <math.h>
|
|
#include "llt.h"
|
|
#include "flisp.h"
|
|
|
|
static char *builtin_names[] =
|
|
{ // special forms
|
|
"quote", "cond", "if", "and", "or", "while", "lambda",
|
|
"trycatch", "%apply", "set!", "prog1", "begin",
|
|
|
|
// predicates
|
|
"eq?", "eqv?", "equal?", "atom?", "not", "null?", "boolean?", "symbol?",
|
|
"number?", "bound?", "pair?", "builtin?", "vector?", "fixnum?",
|
|
|
|
// lists
|
|
"cons", "list", "car", "cdr", "set-car!", "set-cdr!",
|
|
|
|
// execution
|
|
"eval", "eval*", "apply",
|
|
|
|
// arithmetic
|
|
"+", "-", "*", "/", "<", "compare",
|
|
|
|
// sequences
|
|
"vector", "aref", "aset!", "length", "for",
|
|
"", "", "" };
|
|
|
|
#define N_STACK 262144
|
|
value_t StaticStack[N_STACK];
|
|
value_t *Stack = StaticStack;
|
|
uint32_t SP = 0;
|
|
|
|
typedef struct _stackseg_t {
|
|
value_t *Stack;
|
|
uint32_t SP;
|
|
struct _stackseg_t *prev;
|
|
} stackseg_t;
|
|
|
|
stackseg_t stackseg0 = { StaticStack, 0, NULL };
|
|
stackseg_t *current_stack_seg = &stackseg0;
|
|
|
|
value_t NIL, FL_T, FL_F, LAMBDA, QUOTE, IF, TRYCATCH;
|
|
value_t BACKQUOTE, COMMA, COMMAAT, COMMADOT;
|
|
value_t IOError, ParseError, TypeError, ArgError, UnboundError, MemoryError;
|
|
value_t DivideError, BoundsError, Error, KeyError, EnumerationError;
|
|
value_t conssym, symbolsym, fixnumsym, vectorsym, builtinsym;
|
|
value_t definesym, defmacrosym, forsym, labelsym, printprettysym, setqsym;
|
|
value_t printwidthsym, tsym, Tsym, fsym, Fsym, booleansym, nullsym, elsesym;
|
|
|
|
static value_t eval_sexpr(value_t e, value_t *penv, int tail);
|
|
static value_t *alloc_words(int n);
|
|
static value_t relocate(value_t v);
|
|
|
|
typedef struct _readstate_t {
|
|
htable_t backrefs;
|
|
htable_t gensyms;
|
|
value_t source;
|
|
struct _readstate_t *prev;
|
|
} readstate_t;
|
|
static readstate_t *readstate = NULL;
|
|
|
|
static void free_readstate(readstate_t *rs)
|
|
{
|
|
htable_free(&rs->backrefs);
|
|
htable_free(&rs->gensyms);
|
|
}
|
|
|
|
static unsigned char *fromspace;
|
|
static unsigned char *tospace;
|
|
static unsigned char *curheap;
|
|
static unsigned char *lim;
|
|
static uint32_t heapsize = 512*1024;//bytes
|
|
static uint32_t *consflags;
|
|
|
|
// error utilities ------------------------------------------------------------
|
|
|
|
// saved execution state for an unwind target
|
|
typedef struct _ectx_t {
|
|
jmp_buf buf;
|
|
uint32_t sp;
|
|
readstate_t *rdst;
|
|
struct _ectx_t *prev;
|
|
} exception_context_t;
|
|
|
|
static exception_context_t *ctx = NULL;
|
|
static value_t lasterror;
|
|
|
|
#define FL_TRY \
|
|
exception_context_t _ctx; int l__tr, l__ca; \
|
|
_ctx.sp=SP; _ctx.rdst=readstate; _ctx.prev=ctx; \
|
|
ctx = &_ctx; \
|
|
if (!setjmp(_ctx.buf)) \
|
|
for (l__tr=1; l__tr; l__tr=0, (void)(ctx->prev && (ctx=ctx->prev)))
|
|
|
|
#define FL_CATCH \
|
|
else \
|
|
for (l__ca=1; l__ca; l__ca=0, lasterror=NIL)
|
|
|
|
void raise(value_t e)
|
|
{
|
|
lasterror = e;
|
|
// unwind read state
|
|
while (readstate != ctx->rdst) {
|
|
free_readstate(readstate);
|
|
readstate = readstate->prev;
|
|
}
|
|
SP = ctx->sp;
|
|
exception_context_t *thisctx = ctx;
|
|
if (ctx->prev) // don't throw past toplevel
|
|
ctx = ctx->prev;
|
|
longjmp(thisctx->buf, 1);
|
|
}
|
|
|
|
static value_t make_error_msg(char *format, va_list args)
|
|
{
|
|
char msgbuf[512];
|
|
vsnprintf(msgbuf, sizeof(msgbuf), format, args);
|
|
return string_from_cstr(msgbuf);
|
|
}
|
|
|
|
void lerrorf(value_t e, char *format, ...)
|
|
{
|
|
va_list args;
|
|
PUSH(e);
|
|
va_start(args, format);
|
|
value_t msg = make_error_msg(format, args);
|
|
va_end(args);
|
|
|
|
e = POP();
|
|
raise(list2(e, msg));
|
|
}
|
|
|
|
void lerror(value_t e, const char *msg)
|
|
{
|
|
PUSH(e);
|
|
value_t m = cvalue_static_cstring(msg);
|
|
e = POP();
|
|
raise(list2(e, m));
|
|
}
|
|
|
|
void type_error(char *fname, char *expected, value_t got)
|
|
{
|
|
raise(listn(4, TypeError, symbol(fname), symbol(expected), got));
|
|
}
|
|
|
|
void bounds_error(char *fname, value_t arr, value_t ind)
|
|
{
|
|
lerrorf(listn(3, BoundsError, arr, ind), "%s: index out of bounds", fname);
|
|
}
|
|
|
|
// safe cast operators --------------------------------------------------------
|
|
|
|
#define SAFECAST_OP(type,ctype,cnvt) \
|
|
ctype to##type(value_t v, char *fname) \
|
|
{ \
|
|
if (__likely(is##type(v))) \
|
|
return (ctype)cnvt(v); \
|
|
type_error(fname, #type, v); \
|
|
}
|
|
SAFECAST_OP(cons, cons_t*, ptr)
|
|
SAFECAST_OP(symbol,symbol_t*,ptr)
|
|
SAFECAST_OP(fixnum,fixnum_t, numval)
|
|
SAFECAST_OP(cvalue,cvalue_t*,ptr)
|
|
SAFECAST_OP(string,char*, cvalue_data)
|
|
|
|
// symbol table ---------------------------------------------------------------
|
|
|
|
symbol_t *symtab = NULL;
|
|
|
|
static symbol_t *mk_symbol(char *str)
|
|
{
|
|
symbol_t *sym;
|
|
size_t len = strlen(str);
|
|
|
|
sym = (symbol_t*)malloc(sizeof(symbol_t)-sizeof(void*) + len + 1);
|
|
assert(((uptrint_t)sym & 0x7) == 0); // make sure malloc aligns 8
|
|
sym->left = sym->right = NULL;
|
|
if (str[0] == ':') {
|
|
value_t s = tagptr(sym, TAG_SYM);
|
|
setc(s, s);
|
|
}
|
|
else {
|
|
sym->binding = UNBOUND;
|
|
sym->syntax = 0;
|
|
}
|
|
sym->type = sym->dlcache = NULL;
|
|
sym->hash = memhash32(str, len)^0xAAAAAAAA;
|
|
strcpy(&sym->name[0], str);
|
|
return sym;
|
|
}
|
|
|
|
static symbol_t **symtab_lookup(symbol_t **ptree, char *str)
|
|
{
|
|
int x;
|
|
|
|
while(*ptree != NULL) {
|
|
x = strcmp(str, (*ptree)->name);
|
|
if (x == 0)
|
|
return ptree;
|
|
if (x < 0)
|
|
ptree = &(*ptree)->left;
|
|
else
|
|
ptree = &(*ptree)->right;
|
|
}
|
|
return ptree;
|
|
}
|
|
|
|
value_t symbol(char *str)
|
|
{
|
|
symbol_t **pnode;
|
|
|
|
pnode = symtab_lookup(&symtab, str);
|
|
if (*pnode == NULL)
|
|
*pnode = mk_symbol(str);
|
|
return tagptr(*pnode, TAG_SYM);
|
|
}
|
|
|
|
typedef struct {
|
|
value_t syntax; // syntax environment entry
|
|
value_t binding; // global value binding
|
|
fltype_t *type;
|
|
uint32_t id;
|
|
} gensym_t;
|
|
|
|
static uint32_t _gensym_ctr=0;
|
|
// two static buffers for gensym printing so there can be two
|
|
// gensym names available at a time, mostly for compare()
|
|
static char gsname[2][16];
|
|
static int gsnameno=0;
|
|
value_t gensym(value_t *args, uint32_t nargs)
|
|
{
|
|
(void)args;
|
|
(void)nargs;
|
|
gensym_t *gs = (gensym_t*)alloc_words(sizeof(gensym_t)/sizeof(void*));
|
|
gs->id = _gensym_ctr++;
|
|
gs->binding = UNBOUND;
|
|
gs->syntax = 0;
|
|
gs->type = NULL;
|
|
return tagptr(gs, TAG_SYM);
|
|
}
|
|
|
|
value_t fl_gensym()
|
|
{
|
|
return gensym(NULL, 0);
|
|
}
|
|
|
|
char *symbol_name(value_t v)
|
|
{
|
|
if (ismanaged(v)) {
|
|
gensym_t *gs = (gensym_t*)ptr(v);
|
|
gsnameno = 1-gsnameno;
|
|
char *n = uint2str(gsname[gsnameno]+1, sizeof(gsname[0])-1, gs->id, 10);
|
|
*(--n) = 'g';
|
|
return n;
|
|
}
|
|
return ((symbol_t*)ptr(v))->name;
|
|
}
|
|
|
|
// conses ---------------------------------------------------------------------
|
|
|
|
void gc(int mustgrow);
|
|
|
|
static value_t mk_cons(void)
|
|
{
|
|
cons_t *c;
|
|
|
|
if (__unlikely(curheap > lim))
|
|
gc(0);
|
|
c = (cons_t*)curheap;
|
|
curheap += sizeof(cons_t);
|
|
return tagptr(c, TAG_CONS);
|
|
}
|
|
|
|
static value_t *alloc_words(int n)
|
|
{
|
|
value_t *first;
|
|
|
|
assert(n > 0);
|
|
n = ALIGN(n, 2); // only allocate multiples of 2 words
|
|
if (__unlikely((value_t*)curheap > ((value_t*)lim)+2-n)) {
|
|
gc(0);
|
|
while ((value_t*)curheap > ((value_t*)lim)+2-n) {
|
|
gc(1);
|
|
}
|
|
}
|
|
first = (value_t*)curheap;
|
|
curheap += (n*sizeof(value_t));
|
|
return first;
|
|
}
|
|
|
|
// allocate n consecutive conses
|
|
#define cons_reserve(n) tagptr(alloc_words((n)*2), TAG_CONS)
|
|
|
|
#define cons_index(c) (((cons_t*)ptr(c))-((cons_t*)fromspace))
|
|
#define ismarked(c) bitvector_get(consflags, cons_index(c))
|
|
#define mark_cons(c) bitvector_set(consflags, cons_index(c), 1)
|
|
#define unmark_cons(c) bitvector_set(consflags, cons_index(c), 0)
|
|
|
|
value_t alloc_vector(size_t n, int init)
|
|
{
|
|
value_t *c = alloc_words(n+1);
|
|
value_t v = tagptr(c, TAG_VECTOR);
|
|
vector_setsize(v, n);
|
|
if (init) {
|
|
unsigned int i;
|
|
for(i=0; i < n; i++)
|
|
vector_elt(v, i) = NIL;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
// cvalues --------------------------------------------------------------------
|
|
|
|
#include "cvalues.c"
|
|
#include "types.c"
|
|
|
|
// print ----------------------------------------------------------------------
|
|
|
|
static int isnumtok(char *tok, value_t *pval);
|
|
static int symchar(char c);
|
|
|
|
#include "print.c"
|
|
|
|
// collector ------------------------------------------------------------------
|
|
|
|
static value_t relocate(value_t v)
|
|
{
|
|
value_t a, d, nc, first, *pcdr;
|
|
uptrint_t t = tag(v);
|
|
|
|
if (t == TAG_CONS) {
|
|
// iterative implementation allows arbitrarily long cons chains
|
|
pcdr = &first;
|
|
do {
|
|
if ((a=car_(v)) == TAG_FWD) {
|
|
*pcdr = cdr_(v);
|
|
return first;
|
|
}
|
|
*pcdr = nc = mk_cons();
|
|
d = cdr_(v);
|
|
car_(v) = TAG_FWD; cdr_(v) = nc;
|
|
car_(nc) = relocate(a);
|
|
pcdr = &cdr_(nc);
|
|
v = d;
|
|
} while (iscons(v));
|
|
*pcdr = (d==NIL) ? NIL : relocate(d);
|
|
return first;
|
|
}
|
|
|
|
if ((t&3) == 0) return v;
|
|
if (!ismanaged(v)) return v;
|
|
if (isforwarded(v)) return forwardloc(v);
|
|
|
|
if (t == TAG_VECTOR) {
|
|
// N.B.: 0-length vectors secretly have space for a first element
|
|
size_t i, newsz, sz = vector_size(v);
|
|
newsz = sz;
|
|
if (vector_elt(v,-1) & 0x1)
|
|
newsz += vector_grow_amt(sz);
|
|
nc = alloc_vector(newsz, 0);
|
|
a = vector_elt(v,0);
|
|
forward(v, nc);
|
|
i = 0;
|
|
if (sz > 0) {
|
|
vector_elt(nc,0) = relocate(a); i++;
|
|
for(; i < sz; i++)
|
|
vector_elt(nc,i) = relocate(vector_elt(v,i));
|
|
}
|
|
for(; i < newsz; i++)
|
|
vector_elt(nc,i) = NIL;
|
|
return nc;
|
|
}
|
|
else if (t == TAG_CPRIM) {
|
|
cprim_t *pcp = (cprim_t*)ptr(v);
|
|
size_t nw = CPRIM_NWORDS-1+NWORDS(cp_class(pcp)->size);
|
|
cprim_t *ncp = (cprim_t*)alloc_words(nw);
|
|
while (nw--)
|
|
((value_t*)ncp)[nw] = ((value_t*)pcp)[nw];
|
|
nc = tagptr(ncp, TAG_CPRIM);
|
|
forward(v, nc);
|
|
return nc;
|
|
}
|
|
else if (t == TAG_CVALUE) {
|
|
return cvalue_relocate(v);
|
|
}
|
|
else if (t == TAG_SYM) {
|
|
gensym_t *gs = (gensym_t*)ptr(v);
|
|
gensym_t *ng = (gensym_t*)alloc_words(sizeof(gensym_t)/sizeof(void*));
|
|
ng->id = gs->id;
|
|
ng->binding = gs->binding;
|
|
ng->syntax = gs->syntax;
|
|
nc = tagptr(ng, TAG_SYM);
|
|
forward(v, nc);
|
|
if (ng->binding != UNBOUND)
|
|
ng->binding = relocate(ng->binding);
|
|
if (iscons(ng->syntax))
|
|
ng->syntax = relocate(ng->syntax);
|
|
return nc;
|
|
}
|
|
return v;
|
|
}
|
|
|
|
value_t relocate_lispvalue(value_t v)
|
|
{
|
|
return relocate(v);
|
|
}
|
|
|
|
static void trace_globals(symbol_t *root)
|
|
{
|
|
while (root != NULL) {
|
|
if (root->binding != UNBOUND)
|
|
root->binding = relocate(root->binding);
|
|
if (iscons(root->syntax))
|
|
root->syntax = relocate(root->syntax);
|
|
trace_globals(root->left);
|
|
root = root->right;
|
|
}
|
|
}
|
|
|
|
static value_t special_apply_form;
|
|
static value_t apply1_args;
|
|
static value_t memory_exception_value;
|
|
|
|
void gc(int mustgrow)
|
|
{
|
|
static int grew = 0;
|
|
void *temp;
|
|
uint32_t i;
|
|
readstate_t *rs;
|
|
stackseg_t *ss;
|
|
|
|
curheap = tospace;
|
|
lim = curheap+heapsize-sizeof(cons_t);
|
|
|
|
ss = current_stack_seg;
|
|
ss->SP = SP;
|
|
while (ss) {
|
|
for (i=0; i < ss->SP; i++)
|
|
ss->Stack[i] = relocate(ss->Stack[i]);
|
|
ss = ss->prev;
|
|
}
|
|
trace_globals(symtab);
|
|
relocate_typetable();
|
|
rs = readstate;
|
|
while (rs) {
|
|
for(i=0; i < rs->backrefs.size; i++)
|
|
rs->backrefs.table[i] = (void*)relocate((value_t)rs->backrefs.table[i]);
|
|
for(i=0; i < rs->gensyms.size; i++)
|
|
rs->gensyms.table[i] = (void*)relocate((value_t)rs->gensyms.table[i]);
|
|
rs->source = relocate(rs->source);
|
|
rs = rs->prev;
|
|
}
|
|
lasterror = relocate(lasterror);
|
|
special_apply_form = relocate(special_apply_form);
|
|
apply1_args = relocate(apply1_args);
|
|
memory_exception_value = relocate(memory_exception_value);
|
|
|
|
sweep_finalizers();
|
|
|
|
#ifdef VERBOSEGC
|
|
printf("GC: found %d/%d live conses\n",
|
|
(curheap-tospace)/sizeof(cons_t), heapsize/sizeof(cons_t));
|
|
#endif
|
|
temp = tospace;
|
|
tospace = fromspace;
|
|
fromspace = temp;
|
|
|
|
// if we're using > 80% of the space, resize tospace so we have
|
|
// more space to fill next time. if we grew tospace last time,
|
|
// grow the other half of the heap this time to catch up.
|
|
if (grew || ((lim-curheap) < (int)(heapsize/5)) || mustgrow) {
|
|
temp = realloc(tospace, grew ? heapsize : heapsize*2);
|
|
if (temp == NULL)
|
|
raise(memory_exception_value);
|
|
tospace = temp;
|
|
if (!grew) {
|
|
heapsize*=2;
|
|
}
|
|
else {
|
|
temp = bitvector_resize(consflags, heapsize/sizeof(cons_t), 1);
|
|
if (temp == NULL)
|
|
raise(memory_exception_value);
|
|
consflags = (uint32_t*)temp;
|
|
}
|
|
grew = !grew;
|
|
}
|
|
if (curheap > lim) // all data was live
|
|
gc(0);
|
|
}
|
|
|
|
// utils ----------------------------------------------------------------------
|
|
|
|
value_t apply(value_t f, value_t l)
|
|
{
|
|
PUSH(f);
|
|
PUSH(l);
|
|
value_t v = toplevel_eval(special_apply_form);
|
|
POPN(2);
|
|
return v;
|
|
}
|
|
|
|
value_t apply1(value_t f, value_t a0)
|
|
{
|
|
car_(apply1_args) = a0;
|
|
return apply(f, apply1_args);
|
|
}
|
|
|
|
value_t listn(size_t n, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, n);
|
|
uint32_t si = SP;
|
|
size_t i;
|
|
|
|
for(i=0; i < n; i++) {
|
|
value_t a = va_arg(ap, value_t);
|
|
PUSH(a);
|
|
}
|
|
cons_t *c = (cons_t*)alloc_words(n*2);
|
|
cons_t *l = c;
|
|
for(i=0; i < n; i++) {
|
|
c->car = Stack[si++];
|
|
c->cdr = tagptr(c+1, TAG_CONS);
|
|
c++;
|
|
}
|
|
(c-1)->cdr = NIL;
|
|
|
|
POPN(n);
|
|
va_end(ap);
|
|
return tagptr(l, TAG_CONS);
|
|
}
|
|
|
|
value_t list2(value_t a, value_t b)
|
|
{
|
|
PUSH(a);
|
|
PUSH(b);
|
|
cons_t *c = (cons_t*)alloc_words(4);
|
|
b = POP();
|
|
a = POP();
|
|
c[0].car = a;
|
|
c[0].cdr = tagptr(c+1, TAG_CONS);
|
|
c[1].car = b;
|
|
c[1].cdr = NIL;
|
|
return tagptr(c, TAG_CONS);
|
|
}
|
|
|
|
value_t fl_cons(value_t a, value_t b)
|
|
{
|
|
PUSH(a);
|
|
PUSH(b);
|
|
value_t c = mk_cons();
|
|
cdr_(c) = POP();
|
|
car_(c) = POP();
|
|
return c;
|
|
}
|
|
|
|
// NOTE: this is NOT an efficient operation. it is only used by the
|
|
// reader; vectors should not generally be resized.
|
|
// vector_grow requires at least 1 and up to 3 garbage collections!
|
|
static value_t vector_grow(value_t v)
|
|
{
|
|
size_t s = vector_size(v);
|
|
size_t d = vector_grow_amt(s);
|
|
PUSH(v);
|
|
// first allocate enough space to guarantee the heap will be big enough
|
|
// for the new vector
|
|
alloc_words(d);
|
|
// setting low bit of vector's size acts as a flag to the collector
|
|
// to grow this vector as it is relocated
|
|
((size_t*)ptr(Stack[SP-1]))[0] |= 0x1;
|
|
gc(0);
|
|
return POP();
|
|
}
|
|
|
|
int isnumber(value_t v)
|
|
{
|
|
return (isfixnum(v) || iscprim(v));
|
|
}
|
|
|
|
// read -----------------------------------------------------------------------
|
|
|
|
#include "read.c"
|
|
|
|
// eval -----------------------------------------------------------------------
|
|
|
|
/*
|
|
take the final cdr as an argument so the list builtin can give
|
|
the same result as (lambda x x).
|
|
|
|
however, there is still one interesting difference.
|
|
(eq a (apply list a)) is always false for nonempty a, while
|
|
(eq a (apply (lambda x x) a)) is always true. the justification for this
|
|
is that a vararg lambda often needs to recur by applying itself to the
|
|
tail of its argument list, so copying the list would be unacceptable.
|
|
*/
|
|
static void list(value_t *pv, uint32_t nargs, value_t *plastcdr)
|
|
{
|
|
cons_t *c;
|
|
uint32_t i;
|
|
*pv = cons_reserve(nargs);
|
|
c = (cons_t*)ptr(*pv);
|
|
for(i=SP-nargs; i < SP; i++) {
|
|
c->car = Stack[i];
|
|
c->cdr = tagptr(c+1, TAG_CONS);
|
|
c++;
|
|
}
|
|
if (nargs > MAX_ARGS)
|
|
(c-2)->cdr = (c-1)->car;
|
|
else
|
|
(c-1)->cdr = *plastcdr;
|
|
}
|
|
|
|
#define eval(e) (selfevaluating(e) ? (e) : eval_sexpr((e),penv,0))
|
|
#define topeval(e, env) (selfevaluating(e) ? (e) : eval_sexpr((e),env,1))
|
|
#define tail_eval(xpr) do { \
|
|
if (selfevaluating(xpr)) { SP=saveSP; return (xpr); } \
|
|
else { e=(xpr); goto eval_top; } } while (0)
|
|
|
|
/* eval a list of expressions, giving a list of the results */
|
|
static value_t evlis(value_t *pv, value_t *penv)
|
|
{
|
|
PUSH(NIL);
|
|
PUSH(NIL);
|
|
value_t *rest = &Stack[SP-1];
|
|
value_t a, v = *pv;
|
|
while (iscons(v)) {
|
|
a = car_(v);
|
|
v = eval(a);
|
|
PUSH(v);
|
|
v = mk_cons();
|
|
car_(v) = Stack[SP-1];
|
|
cdr_(v) = NIL;
|
|
(void)POP();
|
|
if (*rest == NIL)
|
|
Stack[SP-2] = v;
|
|
else
|
|
cdr_(*rest) = v;
|
|
*rest = v;
|
|
v = *pv = cdr_(*pv);
|
|
}
|
|
(void)POP();
|
|
return POP();
|
|
}
|
|
|
|
/*
|
|
If we start to run out of space on the lisp value stack, we allocate
|
|
a new stack array and put it on the top of the chain. The new stack
|
|
is active until this function returns. Any return past this function
|
|
must free the new segment.
|
|
*/
|
|
static value_t new_stackseg(value_t e, value_t *penv, int tail)
|
|
{
|
|
stackseg_t s;
|
|
|
|
s.prev = current_stack_seg;
|
|
s.Stack = (value_t*)malloc(N_STACK * sizeof(value_t));
|
|
if (s.Stack == NULL)
|
|
lerror(MemoryError, "eval: stack overflow");
|
|
current_stack_seg->SP = SP;
|
|
current_stack_seg = &s;
|
|
SP = 0;
|
|
Stack = s.Stack;
|
|
value_t v = NIL;
|
|
int err = 0;
|
|
FL_TRY {
|
|
v = eval_sexpr(e, penv, tail);
|
|
}
|
|
FL_CATCH {
|
|
err = 1;
|
|
v = lasterror;
|
|
}
|
|
free(s.Stack);
|
|
current_stack_seg = s.prev;
|
|
SP = current_stack_seg->SP;
|
|
Stack = current_stack_seg->Stack;
|
|
if (err) raise(v);
|
|
return v;
|
|
}
|
|
|
|
static value_t do_trycatch(value_t expr, value_t *penv)
|
|
{
|
|
value_t v;
|
|
|
|
FL_TRY {
|
|
v = eval(expr);
|
|
}
|
|
FL_CATCH {
|
|
v = cdr_(Stack[SP-1]);
|
|
if (!iscons(v)) {
|
|
v = FL_F; // 1-argument form
|
|
}
|
|
else {
|
|
v = car_(v);
|
|
Stack[SP-1] = eval(v);
|
|
v = apply1(Stack[SP-1], lasterror);
|
|
}
|
|
}
|
|
return v;
|
|
}
|
|
|
|
/* stack setup on entry:
|
|
n n+1 ...
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+
|
|
| LL | VAL | VAL | CLO | | | | |
|
|
+-----+-----+-----+-----+-----+-----+-----+-----+
|
|
^ ^
|
|
| |
|
|
penv SP (who knows where)
|
|
|
|
where LL is the lambda list, CLO is a closed-up environment vector
|
|
(which can be empty, i.e. NIL). An environment vector is just a copy
|
|
of the stack from LL through CLO.
|
|
There might be zero values, in which case LL is NIL.
|
|
|
|
penv[-1] tells you the environment size, from LL through CLO, as a fixnum.
|
|
*/
|
|
static value_t eval_sexpr(value_t e, value_t *penv, int tail)
|
|
{
|
|
value_t f, v, *pv, *lenv;
|
|
cons_t *c;
|
|
symbol_t *sym;
|
|
uint32_t saveSP, bp, envsz, nargs;
|
|
int i, noeval=0;
|
|
fixnum_t s, lo, hi;
|
|
cvalue_t *cv;
|
|
int64_t accum;
|
|
|
|
/*
|
|
ios_printf(ios_stdout, "eval "); print(ios_stdout, e, 0);
|
|
ios_printf(ios_stdout, " in "); print(ios_stdout, penv[0], 0);
|
|
ios_printf(ios_stdout, "\n");
|
|
*/
|
|
saveSP = SP;
|
|
eval_top:
|
|
if (issymbol(e)) {
|
|
sym = (symbol_t*)ptr(e);
|
|
if (sym->syntax == TAG_CONST) { SP=saveSP; return sym->binding; }
|
|
while (1) {
|
|
v = *penv++;
|
|
while (iscons(v)) {
|
|
if (car_(v)==e) { SP=saveSP; return *penv; }
|
|
v = cdr_(v); penv++;
|
|
}
|
|
if (v != NIL) {
|
|
if (v == e) { SP=saveSP; return *penv; } // dotted list
|
|
penv++;
|
|
}
|
|
if (*penv == NIL) break;
|
|
penv = &vector_elt(*penv, 0);
|
|
}
|
|
if (__unlikely((v = sym->binding) == UNBOUND))
|
|
raise(list2(UnboundError, e));
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
if (__unlikely(SP >= (N_STACK-MAX_ARGS-4))) {
|
|
v = new_stackseg(e, penv, tail);
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
bp = SP;
|
|
v = car_(e);
|
|
PUSH(cdr_(e));
|
|
if (selfevaluating(v)) f=v;
|
|
else if (issymbol(v) && (f=((symbol_t*)ptr(v))->syntax)) {
|
|
// handle special syntax forms
|
|
if (isspecial(f))
|
|
goto apply_special;
|
|
else if (f == TAG_CONST)
|
|
f = ((symbol_t*)ptr(v))->binding;
|
|
else {
|
|
noeval = 2;
|
|
PUSH(f);
|
|
v = Stack[bp];
|
|
goto move_args;
|
|
}
|
|
}
|
|
else f = eval(v);
|
|
PUSH(f);
|
|
v = Stack[bp];
|
|
// evaluate argument list, placing arguments on stack
|
|
while (iscons(v)) {
|
|
if (SP-bp-2 == MAX_ARGS) {
|
|
v = evlis(&Stack[bp], penv);
|
|
PUSH(v);
|
|
break;
|
|
}
|
|
v = car_(v);
|
|
v = eval(v);
|
|
PUSH(v);
|
|
v = Stack[bp] = cdr_(Stack[bp]);
|
|
}
|
|
do_apply:
|
|
nargs = SP - bp - 2;
|
|
if (isbuiltinish(f)) {
|
|
// handle builtin function
|
|
apply_special:
|
|
switch (uintval(f)) {
|
|
// special forms
|
|
case F_QUOTE:
|
|
if (__unlikely(!iscons(Stack[bp])))
|
|
lerror(ArgError, "quote: expected argument");
|
|
v = car_(Stack[bp]);
|
|
break;
|
|
case F_SETQ:
|
|
e = car(Stack[bp]);
|
|
v = car(cdr_(Stack[bp]));
|
|
v = eval(v);
|
|
while (1) {
|
|
f = *penv++;
|
|
while (iscons(f)) {
|
|
if (car_(f)==e) {
|
|
*penv = v;
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
f = cdr_(f); penv++;
|
|
}
|
|
if (f != NIL) {
|
|
if (f == e) {
|
|
*penv = v;
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
penv++;
|
|
}
|
|
if (*penv == NIL) break;
|
|
penv = &vector_elt(*penv, 0);
|
|
}
|
|
sym = tosymbol(e, "set!");
|
|
if (sym->syntax != TAG_CONST)
|
|
sym->binding = v;
|
|
break;
|
|
case F_LAMBDA:
|
|
// build a closure (lambda args body . env)
|
|
if (*penv != NIL) {
|
|
// save temporary environment to the heap
|
|
lenv = penv;
|
|
envsz = numval(penv[-1]);
|
|
pv = alloc_words(envsz + 1);
|
|
PUSH(tagptr(pv, TAG_VECTOR));
|
|
pv[0] = fixnum(envsz);
|
|
pv++;
|
|
while (envsz--)
|
|
*pv++ = *penv++;
|
|
// environment representation changed; install
|
|
// the new representation so everybody can see it
|
|
lenv[0] = NIL;
|
|
lenv[1] = Stack[SP-1];
|
|
}
|
|
else {
|
|
PUSH(penv[1]); // env has already been captured; share
|
|
}
|
|
c = (cons_t*)ptr(v=cons_reserve(3));
|
|
e = Stack[bp];
|
|
if (!iscons(e)) goto notpair;
|
|
c->car = LAMBDA;
|
|
c->cdr = tagptr(c+1, TAG_CONS); c++;
|
|
c->car = car_(e); //argsyms
|
|
c->cdr = tagptr(c+1, TAG_CONS); c++;
|
|
if (!iscons(e=cdr_(e))) goto notpair;
|
|
c->car = car_(e); //body
|
|
c->cdr = Stack[SP-1]; //env
|
|
break;
|
|
case F_IF:
|
|
if (!iscons(Stack[bp])) goto notpair;
|
|
v = car_(Stack[bp]);
|
|
if (eval(v) != FL_F) {
|
|
v = cdr_(Stack[bp]);
|
|
if (!iscons(v)) goto notpair;
|
|
v = car_(v);
|
|
}
|
|
else {
|
|
v = cdr_(Stack[bp]);
|
|
if (!iscons(v)) goto notpair;
|
|
if (!iscons(v=cdr_(v))) v = FL_F; // allow 2-arg form
|
|
else v = car_(v);
|
|
}
|
|
tail_eval(v);
|
|
break;
|
|
case F_COND:
|
|
pv = &Stack[bp]; v = FL_F;
|
|
while (iscons(*pv)) {
|
|
c = tocons(car_(*pv), "cond");
|
|
v = c->car;
|
|
// allow last condition to be 'else'
|
|
if (iscons(cdr_(*pv)) || v != elsesym)
|
|
v = eval(v);
|
|
if (v != FL_F) {
|
|
*pv = cdr_(car_(*pv));
|
|
// evaluate body forms
|
|
if (iscons(*pv)) {
|
|
while (iscons(cdr_(*pv))) {
|
|
v = car_(*pv);
|
|
v = eval(v);
|
|
*pv = cdr_(*pv);
|
|
}
|
|
tail_eval(car_(*pv));
|
|
}
|
|
break;
|
|
}
|
|
*pv = cdr_(*pv);
|
|
}
|
|
break;
|
|
case F_AND:
|
|
pv = &Stack[bp]; v = FL_T;
|
|
if (iscons(*pv)) {
|
|
while (iscons(cdr_(*pv))) {
|
|
if ((v=eval(car_(*pv))) == FL_F) {
|
|
SP = saveSP; return FL_F;
|
|
}
|
|
*pv = cdr_(*pv);
|
|
}
|
|
tail_eval(car_(*pv));
|
|
}
|
|
break;
|
|
case F_OR:
|
|
pv = &Stack[bp]; v = FL_F;
|
|
if (iscons(*pv)) {
|
|
while (iscons(cdr_(*pv))) {
|
|
if ((v=eval(car_(*pv))) != FL_F) {
|
|
SP = saveSP; return v;
|
|
}
|
|
*pv = cdr_(*pv);
|
|
}
|
|
tail_eval(car_(*pv));
|
|
}
|
|
break;
|
|
case F_WHILE:
|
|
PUSH(cdr(Stack[bp]));
|
|
lenv = &Stack[SP-1];
|
|
PUSH(*lenv);
|
|
Stack[bp] = car_(Stack[bp]);
|
|
value_t *cond = &Stack[bp];
|
|
PUSH(FL_F);
|
|
pv = &Stack[SP-1];
|
|
while (eval(*cond) != FL_F) {
|
|
*lenv = Stack[SP-2];
|
|
while (iscons(*lenv)) {
|
|
*pv = eval(car_(*lenv));
|
|
*lenv = cdr_(*lenv);
|
|
}
|
|
}
|
|
v = *pv;
|
|
break;
|
|
case F_BEGIN:
|
|
// return last arg
|
|
pv = &Stack[bp];
|
|
if (iscons(*pv)) {
|
|
while (iscons(cdr_(*pv))) {
|
|
v = car_(*pv);
|
|
(void)eval(v);
|
|
*pv = cdr_(*pv);
|
|
}
|
|
tail_eval(car_(*pv));
|
|
}
|
|
v = FL_F;
|
|
break;
|
|
case F_PROG1:
|
|
// return first arg
|
|
pv = &Stack[bp];
|
|
if (__unlikely(!iscons(*pv)))
|
|
lerror(ArgError, "prog1: too few arguments");
|
|
PUSH(eval(car_(*pv)));
|
|
*pv = cdr_(*pv);
|
|
while (iscons(*pv)) {
|
|
(void)eval(car_(*pv));
|
|
*pv = cdr_(*pv);
|
|
}
|
|
v = POP();
|
|
break;
|
|
case F_TRYCATCH:
|
|
v = do_trycatch(car(Stack[bp]), penv);
|
|
break;
|
|
|
|
// ordinary functions
|
|
case F_BOUNDP:
|
|
argcount("bound?", nargs, 1);
|
|
sym = tosymbol(Stack[SP-1], "bound?");
|
|
v = (sym->binding == UNBOUND) ? FL_F : FL_T;
|
|
break;
|
|
case F_EQ:
|
|
argcount("eq?", nargs, 2);
|
|
v = ((Stack[SP-2] == Stack[SP-1]) ? FL_T : FL_F);
|
|
break;
|
|
case F_CONS:
|
|
argcount("cons", nargs, 2);
|
|
if (curheap > lim)
|
|
gc(0);
|
|
c = (cons_t*)curheap;
|
|
curheap += sizeof(cons_t);
|
|
c->car = Stack[SP-2];
|
|
c->cdr = Stack[SP-1];
|
|
v = tagptr(c, TAG_CONS);
|
|
break;
|
|
case F_LIST:
|
|
if (nargs) {
|
|
Stack[bp] = v;
|
|
list(&v, nargs, &Stack[bp]);
|
|
}
|
|
// else v is already set to the final cdr, which is the result
|
|
break;
|
|
case F_CAR:
|
|
argcount("car", nargs, 1);
|
|
v = Stack[SP-1];
|
|
if (!iscons(v)) goto notpair;
|
|
v = car_(v);
|
|
break;
|
|
case F_CDR:
|
|
argcount("cdr", nargs, 1);
|
|
v = Stack[SP-1];
|
|
if (!iscons(v)) goto notpair;
|
|
v = cdr_(v);
|
|
break;
|
|
case F_SETCAR:
|
|
argcount("set-car!", nargs, 2);
|
|
car(v=Stack[SP-2]) = Stack[SP-1];
|
|
break;
|
|
case F_SETCDR:
|
|
argcount("set-cdr!", nargs, 2);
|
|
cdr(v=Stack[SP-2]) = Stack[SP-1];
|
|
break;
|
|
case F_VECTOR:
|
|
if (nargs > MAX_ARGS) {
|
|
i = llength(Stack[SP-1]);
|
|
nargs--;
|
|
}
|
|
else i = 0;
|
|
v = alloc_vector(nargs+i, 0);
|
|
memcpy(&vector_elt(v,0), &Stack[bp+2], nargs*sizeof(value_t));
|
|
if (i > 0) {
|
|
e = Stack[SP-1];
|
|
while (iscons(e)) {
|
|
vector_elt(v,nargs) = car_(e);
|
|
nargs++;
|
|
e = cdr_(e);
|
|
}
|
|
}
|
|
break;
|
|
case F_LENGTH:
|
|
argcount("length", nargs, 1);
|
|
if (isvector(Stack[SP-1])) {
|
|
v = fixnum(vector_size(Stack[SP-1]));
|
|
break;
|
|
}
|
|
else if (iscprim(Stack[SP-1])) {
|
|
cv = (cvalue_t*)ptr(Stack[SP-1]);
|
|
if (cp_class(cv) == bytetype) {
|
|
v = fixnum(1);
|
|
break;
|
|
}
|
|
else if (cp_class(cv) == wchartype) {
|
|
v = fixnum(u8_charlen(*(uint32_t*)cp_data((cprim_t*)cv)));
|
|
break;
|
|
}
|
|
}
|
|
else if (iscvalue(Stack[SP-1])) {
|
|
cv = (cvalue_t*)ptr(Stack[SP-1]);
|
|
if (cv_class(cv)->eltype != NULL) {
|
|
v = size_wrap(cvalue_arraylen(Stack[SP-1]));
|
|
break;
|
|
}
|
|
}
|
|
else if (Stack[SP-1] == NIL) {
|
|
v = fixnum(0); break;
|
|
}
|
|
else if (iscons(Stack[SP-1])) {
|
|
v = fixnum(llength(Stack[SP-1])); break;
|
|
}
|
|
type_error("length", "sequence", Stack[SP-1]);
|
|
break;
|
|
case F_AREF:
|
|
argcount("aref", nargs, 2);
|
|
v = Stack[SP-2];
|
|
if (isvector(v)) {
|
|
i = tofixnum(Stack[SP-1], "aref");
|
|
if (__unlikely((unsigned)i >= vector_size(v)))
|
|
bounds_error("aref", v, Stack[SP-1]);
|
|
v = vector_elt(v, i);
|
|
}
|
|
else if (isarray(v)) {
|
|
v = cvalue_array_aref(&Stack[SP-2]);
|
|
}
|
|
else {
|
|
// TODO other sequence types?
|
|
type_error("aref", "sequence", v);
|
|
}
|
|
break;
|
|
case F_ASET:
|
|
argcount("aset!", nargs, 3);
|
|
e = Stack[SP-3];
|
|
if (isvector(e)) {
|
|
i = tofixnum(Stack[SP-2], "aset!");
|
|
if (__unlikely((unsigned)i >= vector_size(e)))
|
|
bounds_error("aset!", v, Stack[SP-1]);
|
|
vector_elt(e, i) = (v=Stack[SP-1]);
|
|
}
|
|
else if (isarray(e)) {
|
|
v = cvalue_array_aset(&Stack[SP-3]);
|
|
}
|
|
else {
|
|
type_error("aset!", "sequence", e);
|
|
}
|
|
break;
|
|
case F_ATOM:
|
|
argcount("atom?", nargs, 1);
|
|
v = ((!iscons(Stack[SP-1])) ? FL_T : FL_F);
|
|
break;
|
|
case F_CONSP:
|
|
argcount("pair?", nargs, 1);
|
|
v = (iscons(Stack[SP-1]) ? FL_T : FL_F);
|
|
break;
|
|
case F_SYMBOLP:
|
|
argcount("symbol?", nargs, 1);
|
|
v = ((issymbol(Stack[SP-1])) ? FL_T : FL_F);
|
|
break;
|
|
case F_NUMBERP:
|
|
argcount("number?", nargs, 1);
|
|
v = (isfixnum(Stack[SP-1]) || iscprim(Stack[SP-1]) ? FL_T : FL_F);
|
|
break;
|
|
case F_FIXNUMP:
|
|
argcount("fixnum?", nargs, 1);
|
|
v = (isfixnum(Stack[SP-1]) ? FL_T : FL_F);
|
|
break;
|
|
case F_BUILTINP:
|
|
argcount("builtin?", nargs, 1);
|
|
v = Stack[SP-1];
|
|
v = ((isbuiltinish(v) && v!=FL_F && v!=FL_T && v!=NIL)
|
|
? FL_T : FL_F);
|
|
break;
|
|
case F_VECTORP:
|
|
argcount("vector?", nargs, 1);
|
|
v = ((isvector(Stack[SP-1])) ? FL_T : FL_F);
|
|
break;
|
|
case F_NOT:
|
|
argcount("not", nargs, 1);
|
|
v = ((Stack[SP-1] == FL_F) ? FL_T : FL_F);
|
|
break;
|
|
case F_NULL:
|
|
argcount("null?", nargs, 1);
|
|
v = ((Stack[SP-1] == NIL) ? FL_T : FL_F);
|
|
break;
|
|
case F_BOOLEANP:
|
|
argcount("boolean?", nargs, 1);
|
|
v = Stack[SP-1];
|
|
v = ((v == FL_T || v == FL_F) ? FL_T : FL_F);
|
|
break;
|
|
case F_ADD:
|
|
s = 0;
|
|
i = bp+2;
|
|
if (nargs > MAX_ARGS) goto add_ovf;
|
|
for (; i < (int)SP; i++) {
|
|
if (__likely(isfixnum(Stack[i]))) {
|
|
s += numval(Stack[i]);
|
|
if (__unlikely(!fits_fixnum(s))) {
|
|
i++;
|
|
goto add_ovf;
|
|
}
|
|
}
|
|
else {
|
|
add_ovf:
|
|
v = fl_add_any(&Stack[i], SP-i, s);
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
}
|
|
v = fixnum(s);
|
|
break;
|
|
case F_SUB:
|
|
if (__unlikely(nargs < 1)) lerror(ArgError, "-: too few arguments");
|
|
i = bp+2;
|
|
if (nargs == 1) {
|
|
if (__likely(isfixnum(Stack[i])))
|
|
v = fixnum(-numval(Stack[i]));
|
|
else
|
|
v = fl_neg(Stack[i]);
|
|
break;
|
|
}
|
|
if (nargs == 2) {
|
|
if (__likely(bothfixnums(Stack[i], Stack[i+1]))) {
|
|
s = numval(Stack[i]) - numval(Stack[i+1]);
|
|
if (__likely(fits_fixnum(s))) {
|
|
v = fixnum(s);
|
|
break;
|
|
}
|
|
Stack[i+1] = fixnum(-numval(Stack[i+1]));
|
|
}
|
|
else {
|
|
Stack[i+1] = fl_neg(Stack[i+1]);
|
|
}
|
|
}
|
|
else {
|
|
// we need to pass the full arglist on to fl_add_any
|
|
// so it can handle rest args properly
|
|
PUSH(Stack[i]);
|
|
Stack[i] = fixnum(0);
|
|
Stack[i+1] = fl_neg(fl_add_any(&Stack[i], nargs, 0));
|
|
Stack[i] = POP();
|
|
}
|
|
v = fl_add_any(&Stack[i], 2, 0);
|
|
break;
|
|
case F_MUL:
|
|
accum = 1;
|
|
i = bp+2;
|
|
if (nargs > MAX_ARGS) goto mul_ovf;
|
|
for (; i < (int)SP; i++) {
|
|
if (__likely(isfixnum(Stack[i]))) {
|
|
accum *= numval(Stack[i]);
|
|
}
|
|
else {
|
|
mul_ovf:
|
|
v = fl_mul_any(&Stack[i], SP-i, accum);
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
}
|
|
if (__likely(fits_fixnum(accum)))
|
|
v = fixnum(accum);
|
|
else
|
|
v = return_from_int64(accum);
|
|
break;
|
|
case F_DIV:
|
|
if (__unlikely(nargs < 1)) lerror(ArgError, "/: too few arguments");
|
|
i = bp+2;
|
|
if (nargs == 1) {
|
|
v = fl_div2(fixnum(1), Stack[i]);
|
|
}
|
|
else {
|
|
if (nargs > 2) {
|
|
PUSH(Stack[i]);
|
|
Stack[i] = fixnum(1);
|
|
Stack[i+1] = fl_mul_any(&Stack[i], nargs, 1);
|
|
Stack[i] = POP();
|
|
}
|
|
v = fl_div2(Stack[i], Stack[i+1]);
|
|
}
|
|
break;
|
|
case F_COMPARE:
|
|
argcount("compare", nargs, 2);
|
|
v = compare(Stack[SP-2], Stack[SP-1]);
|
|
break;
|
|
case F_LT:
|
|
argcount("<", nargs, 2);
|
|
if (bothfixnums(Stack[SP-2], Stack[SP-1])) {
|
|
v = (numval(Stack[SP-2]) < numval(Stack[SP-1])) ? FL_T : FL_F;
|
|
}
|
|
else {
|
|
v = (numval(compare(Stack[SP-2], Stack[SP-1])) < 0) ?
|
|
FL_T : FL_F;
|
|
}
|
|
break;
|
|
case F_EQUAL:
|
|
argcount("equal?", nargs, 2);
|
|
if (Stack[SP-2] == Stack[SP-1]) {
|
|
v = FL_T;
|
|
}
|
|
else if (eq_comparable(Stack[SP-2],Stack[SP-1])) {
|
|
v = FL_F;
|
|
}
|
|
else {
|
|
v = (numval(compare(Stack[SP-2], Stack[SP-1]))==0) ?
|
|
FL_T : FL_F;
|
|
}
|
|
break;
|
|
case F_EQV:
|
|
argcount("eqv?", nargs, 2);
|
|
if (Stack[SP-2] == Stack[SP-1]) {
|
|
v = FL_T;
|
|
}
|
|
else if (!leafp(Stack[SP-2]) || !leafp(Stack[SP-1])) {
|
|
v = FL_F;
|
|
}
|
|
else {
|
|
v = (numval(compare(Stack[SP-2], Stack[SP-1]))==0) ?
|
|
FL_T : FL_F;
|
|
}
|
|
break;
|
|
case F_EVAL:
|
|
argcount("eval", nargs, 1);
|
|
v = Stack[SP-1];
|
|
if (selfevaluating(v)) { SP=saveSP; return v; }
|
|
if (tail) {
|
|
assert((ulong_t)(penv-Stack)<N_STACK);
|
|
penv[-1] = fixnum(2);
|
|
penv[0] = NIL;
|
|
penv[1] = NIL;
|
|
SP = (penv-Stack) + 2;
|
|
e=v;
|
|
goto eval_top;
|
|
}
|
|
else {
|
|
PUSH(NIL);
|
|
PUSH(NIL);
|
|
v = eval_sexpr(v, &Stack[SP-2], 1);
|
|
}
|
|
break;
|
|
case F_EVALSTAR:
|
|
argcount("eval*", nargs, 1);
|
|
e = Stack[SP-1];
|
|
if (selfevaluating(e)) { SP=saveSP; return e; }
|
|
POPN(3);
|
|
goto eval_top;
|
|
case F_FOR:
|
|
argcount("for", nargs, 3);
|
|
lo = tofixnum(Stack[SP-3], "for");
|
|
hi = tofixnum(Stack[SP-2], "for");
|
|
f = Stack[SP-1];
|
|
v = car(cdr(f));
|
|
if (!iscons(v) || !iscons(cdr_(cdr_(f))) || cdr_(v) != NIL)
|
|
lerror(ArgError, "for: expected 1 argument lambda");
|
|
f = cdr_(f);
|
|
PUSH(f); // save function cdr
|
|
SP += 4; // make space
|
|
Stack[SP-4] = fixnum(3); // env size
|
|
Stack[SP-1] = cdr_(cdr_(f)); // cloenv
|
|
v = FL_F;
|
|
for(s=lo; s <= hi; s++) {
|
|
f = Stack[SP-5];
|
|
Stack[SP-3] = car_(f); // lambda list
|
|
Stack[SP-2] = fixnum(s); // argument value
|
|
v = car_(cdr_(f));
|
|
if (!selfevaluating(v)) v = eval_sexpr(v, &Stack[SP-3], 0);
|
|
}
|
|
break;
|
|
case F_SPECIAL_APPLY:
|
|
f = Stack[bp-4];
|
|
v = Stack[bp-3];
|
|
PUSH(f);
|
|
PUSH(v);
|
|
nargs = 2;
|
|
// falls through!!
|
|
case F_APPLY:
|
|
argcount("apply", nargs, 2);
|
|
v = Stack[bp] = Stack[SP-1]; // second arg is new arglist
|
|
f = Stack[bp+1] = Stack[SP-2]; // first arg is new function
|
|
POPN(2); // pop apply's args
|
|
move_args:
|
|
while (iscons(v)) {
|
|
if (SP-bp-2 == MAX_ARGS) {
|
|
PUSH(v);
|
|
break;
|
|
}
|
|
PUSH(car_(v));
|
|
v = cdr_(v);
|
|
}
|
|
goto do_apply;
|
|
case F_TRUE:
|
|
case F_FALSE:
|
|
case F_NIL:
|
|
goto apply_type_error;
|
|
default:
|
|
// function pointer tagged as a builtin
|
|
v = ((builtin_t)ptr(f))(&Stack[bp+2], nargs);
|
|
}
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
if (__likely(iscons(f))) {
|
|
// apply lambda expression
|
|
f = Stack[bp+1];
|
|
f = Stack[bp+1] = cdr_(f);
|
|
if (!iscons(f)) goto notpair;
|
|
v = car_(f); // arglist
|
|
i = nargs;
|
|
while (iscons(v)) {
|
|
if (i == 0)
|
|
lerror(ArgError, "apply: too few arguments");
|
|
i--;
|
|
v = cdr_(v);
|
|
}
|
|
if (v == NIL) {
|
|
if (i > 0)
|
|
lerror(ArgError, "apply: too many arguments");
|
|
}
|
|
else {
|
|
if (i > 0) {
|
|
list(&v, i, &NIL);
|
|
if (nargs > MAX_ARGS) {
|
|
c = (cons_t*)curheap;
|
|
(c-2)->cdr = (c-1)->car;
|
|
}
|
|
Stack[SP-i] = v;
|
|
SP -= (i-1);
|
|
}
|
|
else {
|
|
PUSH(NIL);
|
|
}
|
|
}
|
|
f = cdr_(Stack[bp+1]);
|
|
if (!iscons(f)) goto notpair;
|
|
e = car_(f);
|
|
if (selfevaluating(e)) { SP=saveSP; return(e); }
|
|
PUSH(cdr_(f)); // add closed environment
|
|
Stack[bp+1] = car_(Stack[bp+1]); // put lambda list
|
|
envsz = SP - bp - 1;
|
|
|
|
if (noeval == 2) {
|
|
// macro: evaluate body in lambda environment
|
|
Stack[bp] = fixnum(envsz);
|
|
e = eval_sexpr(e, &Stack[bp+1], 1);
|
|
if (selfevaluating(e)) { SP=saveSP; return(e); }
|
|
noeval = 0;
|
|
// macro: evaluate expansion in calling environment
|
|
goto eval_top;
|
|
}
|
|
else {
|
|
if (tail) {
|
|
// ok to overwrite environment
|
|
penv[-1] = fixnum(envsz);
|
|
for(i=0; i < (int)envsz; i++)
|
|
penv[i] = Stack[bp+1+i];
|
|
SP = (penv-Stack)+envsz;
|
|
goto eval_top;
|
|
}
|
|
else {
|
|
Stack[bp] = fixnum(envsz);
|
|
penv = &Stack[bp+1];
|
|
tail = 1;
|
|
goto eval_top;
|
|
}
|
|
}
|
|
// not reached
|
|
}
|
|
apply_type_error:
|
|
type_error("apply", "function", f);
|
|
notpair:
|
|
lerror(TypeError, "expected cons");
|
|
return NIL;
|
|
}
|
|
|
|
// initialization -------------------------------------------------------------
|
|
|
|
extern void builtins_init();
|
|
extern void comparehash_init();
|
|
|
|
static char *EXEDIR = NULL;
|
|
|
|
void assign_global_builtins(builtinspec_t *b)
|
|
{
|
|
while (b->name != NULL) {
|
|
set(symbol(b->name), cbuiltin(b->name, b->fptr));
|
|
b++;
|
|
}
|
|
}
|
|
|
|
static void lisp_init(void)
|
|
{
|
|
int i;
|
|
|
|
llt_init();
|
|
|
|
fromspace = malloc(heapsize);
|
|
tospace = malloc(heapsize);
|
|
curheap = fromspace;
|
|
lim = curheap+heapsize-sizeof(cons_t);
|
|
consflags = bitvector_new(heapsize/sizeof(cons_t), 1);
|
|
htable_new(&printconses, 32);
|
|
comparehash_init();
|
|
|
|
NIL = builtin(F_NIL);
|
|
FL_T = builtin(F_TRUE);
|
|
FL_F = builtin(F_FALSE);
|
|
LAMBDA = symbol("lambda");
|
|
QUOTE = symbol("quote");
|
|
TRYCATCH = symbol("trycatch");
|
|
BACKQUOTE = symbol("backquote");
|
|
COMMA = symbol("*comma*");
|
|
COMMAAT = symbol("*comma-at*");
|
|
COMMADOT = symbol("*comma-dot*");
|
|
IOError = symbol("io-error");
|
|
ParseError = symbol("parse-error");
|
|
TypeError = symbol("type-error");
|
|
ArgError = symbol("arg-error");
|
|
UnboundError = symbol("unbound-error");
|
|
KeyError = symbol("key-error");
|
|
MemoryError = symbol("memory-error");
|
|
BoundsError = symbol("bounds-error");
|
|
DivideError = symbol("divide-error");
|
|
EnumerationError = symbol("enumeration-error");
|
|
Error = symbol("error");
|
|
conssym = symbol("cons");
|
|
symbolsym = symbol("symbol");
|
|
fixnumsym = symbol("fixnum");
|
|
vectorsym = symbol("vector");
|
|
builtinsym = symbol("builtin");
|
|
booleansym = symbol("boolean");
|
|
nullsym = symbol("null");
|
|
definesym = symbol("define");
|
|
defmacrosym = symbol("define-macro");
|
|
forsym = symbol("for");
|
|
labelsym = symbol("label");
|
|
setqsym = symbol("set!");
|
|
elsesym = symbol("else");
|
|
tsym = symbol("t"); Tsym = symbol("T");
|
|
fsym = symbol("f"); Fsym = symbol("F");
|
|
set(printprettysym=symbol("*print-pretty*"), FL_T);
|
|
set(printwidthsym=symbol("*print-width*"), fixnum(SCR_WIDTH));
|
|
lasterror = NIL;
|
|
special_apply_form = fl_cons(builtin(F_SPECIAL_APPLY), NIL);
|
|
apply1_args = fl_cons(NIL, NIL);
|
|
i = 0;
|
|
while (isspecial(builtin(i))) {
|
|
if (i != F_SPECIAL_APPLY)
|
|
((symbol_t*)ptr(symbol(builtin_names[i])))->syntax = builtin(i);
|
|
i++;
|
|
}
|
|
for (; i < F_TRUE; i++) {
|
|
setc(symbol(builtin_names[i]), builtin(i));
|
|
}
|
|
setc(symbol("eq"), builtin(F_EQ));
|
|
setc(symbol("equal"), builtin(F_EQUAL));
|
|
|
|
#ifdef LINUX
|
|
set(symbol("*os-name*"), symbol("linux"));
|
|
#elif defined(WIN32) || defined(WIN64)
|
|
set(symbol("*os-name*"), symbol("win32"));
|
|
#elif defined(MACOSX)
|
|
set(symbol("*os-name*"), symbol("macos"));
|
|
#else
|
|
set(symbol("*os-name*"), symbol("unknown"));
|
|
#endif
|
|
|
|
cvalues_init();
|
|
set(symbol("gensym"), cbuiltin("gensym", gensym));
|
|
set(symbol("hash"), cbuiltin("hash", fl_hash));
|
|
|
|
char buf[1024];
|
|
char *exename = get_exename(buf, sizeof(buf));
|
|
if (exename != NULL) {
|
|
path_to_dirname(exename);
|
|
EXEDIR = strdup(exename);
|
|
setc(symbol("*install-dir*"), cvalue_static_cstring(EXEDIR));
|
|
}
|
|
|
|
memory_exception_value = list2(MemoryError,
|
|
cvalue_static_cstring("out of memory"));
|
|
|
|
builtins_init();
|
|
}
|
|
|
|
// repl -----------------------------------------------------------------------
|
|
|
|
value_t toplevel_eval(value_t expr)
|
|
{
|
|
value_t v;
|
|
uint32_t saveSP = SP;
|
|
PUSH(NIL);
|
|
PUSH(NIL);
|
|
v = topeval(expr, &Stack[SP-2]);
|
|
SP = saveSP;
|
|
return v;
|
|
}
|
|
|
|
static value_t argv_list(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
PUSH(NIL);
|
|
for(i=argc-1; i >= 0; i--) {
|
|
PUSH(cvalue_static_cstring(argv[i]));
|
|
Stack[SP-2] = fl_cons(Stack[SP-1], Stack[SP-2]);
|
|
(void)POP();
|
|
}
|
|
return POP();
|
|
}
|
|
|
|
int locale_is_utf8;
|
|
|
|
extern value_t fl_file(value_t *args, uint32_t nargs);
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
value_t e, v;
|
|
char fname_buf[1024];
|
|
|
|
locale_is_utf8 = u8_is_locale_utf8(setlocale(LC_ALL, ""));
|
|
|
|
lisp_init();
|
|
|
|
fname_buf[0] = '\0';
|
|
if (EXEDIR != NULL) {
|
|
strcat(fname_buf, EXEDIR);
|
|
strcat(fname_buf, PATHSEPSTRING);
|
|
}
|
|
strcat(fname_buf, "system.lsp");
|
|
|
|
FL_TRY {
|
|
// install toplevel exception handler
|
|
PUSH(cvalue_static_cstring(fname_buf));
|
|
PUSH(symbol(":read"));
|
|
value_t f = fl_file(&Stack[SP-2], 2);
|
|
POPN(2);
|
|
PUSH(f);
|
|
while (1) {
|
|
e = read_sexpr(Stack[SP-1]);
|
|
if (ios_eof(value2c(ios_t*,Stack[SP-1]))) break;
|
|
v = toplevel_eval(e);
|
|
}
|
|
ios_close(value2c(ios_t*,Stack[SP-1]));
|
|
(void)POP();
|
|
|
|
PUSH(symbol_value(symbol("__start")));
|
|
PUSH(argv_list(argc, argv));
|
|
(void)toplevel_eval(special_apply_form);
|
|
}
|
|
FL_CATCH {
|
|
ios_puts("fatal error during bootstrap:\n", ios_stderr);
|
|
print(ios_stderr, lasterror, 0);
|
|
ios_putc('\n', ios_stderr);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|