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flisp.c
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/*
femtoLisp
a compact interpreter for a minimal lisp/scheme dialect
characteristics:
* lexical scope, lisp-1
* unrestricted macros
* data types: 30-bit integer, symbol, pair, vector, char, string, table
iostream, procedure, low-level data types
* case-sensitive
* simple compacting copying garbage collector
* Scheme-style varargs (dotted formal argument lists)
* "human-readable" bytecode with self-hosted compiler
extra features:
* circular structure can be printed and read
* #. read macro for eval-when-read and readably printing builtins
* read macros for backquote
* symbol character-escaping printer
* exceptions
* gensyms (can be usefully read back in, too)
* #| multiline comments |#, lots of other lexical syntax
* generic compare function, cyclic equal
* cvalues system providing C data types and a C FFI
* constructor notation for nicely printing arbitrary values
by Jeff Bezanson (C) 2009
Distributed under the BSD License
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <setjmp.h>
#include <stdint.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 "platform.h"
#include "libsupport.h"
#include "flisp.h"
#include "opcodes.h"
#ifdef __cplusplus
extern "C" {
#endif
#if defined(_OS_WINDOWS_) && !defined(_COMPILER_MINGW_)
#include <malloc.h>
DLLEXPORT char * basename(char *);
DLLEXPORT char * dirname(char *);
#else
#include <libgen.h>
#endif
static char *builtin_names[] =
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
// predicates
"eq?", "eqv?", "equal?", "atom?", "not", "null?", "boolean?", "symbol?",
"number?", "bound?", "pair?", "builtin?", "vector?", "fixnum?",
"function?",
// lists
"cons", "list", "car", "cdr", "set-car!", "set-cdr!",
// execution
"apply",
// arithmetic
"+", "-", "*", "/", "div0", "=", "<", "compare",
// sequences
"vector", "aref", "aset!",
"", "", "" };
#define ANYARGS -10000
static short builtin_arg_counts[] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, ANYARGS, 1, 1, 2, 2,
-2,
ANYARGS, -1, ANYARGS, -1, 2, 2, 2, 2,
ANYARGS, 2, 3 };
static uint32_t N_STACK;
static value_t *Stack;
static uint32_t SP = 0;
static uint32_t curr_frame = 0;
#define PUSH(v) (Stack[SP++] = (v))
#define POP() (Stack[--SP])
#define POPN(n) (SP-=(n))
#define N_GC_HANDLES 1024
static value_t *GCHandleStack[N_GC_HANDLES];
static uint32_t N_GCHND = 0;
value_t FL_NIL, FL_T, FL_F, FL_EOF, QUOTE;
value_t IOError, ParseError, TypeError, ArgError, UnboundError, MemoryError;
value_t DivideError, BoundsError, Error, KeyError, EnumerationError;
value_t printwidthsym, printreadablysym, printprettysym, printlengthsym;
value_t printlevelsym, builtins_table_sym;
static value_t NIL, LAMBDA, IF, TRYCATCH;
static value_t BACKQUOTE, COMMA, COMMAAT, COMMADOT, FUNCTION;
static value_t pairsym, symbolsym, fixnumsym, vectorsym, builtinsym, vu8sym;
static value_t definesym, defmacrosym, forsym, setqsym;
static value_t tsym, Tsym, fsym, Fsym, booleansym, nullsym, evalsym, fnsym;
// for reading characters
static value_t nulsym, alarmsym, backspacesym, tabsym, linefeedsym, newlinesym;
static value_t vtabsym, pagesym, returnsym, escsym, spacesym, deletesym;
static value_t apply_cl(uint32_t nargs);
static value_t *alloc_words(int n);
static value_t relocate(value_t v);
typedef struct _fl_readstate_t {
htable_t backrefs;
htable_t gensyms;
value_t source;
struct _fl_readstate_t *prev;
} fl_readstate_t;
static fl_readstate_t *readstate = NULL;
static void free_readstate(fl_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;//bytes
static uint32_t *consflags;
// error utilities ------------------------------------------------------------
// saved execution state for an unwind target
fl_exception_context_t *fl_ctx = NULL;
uint32_t fl_throwing_frame=0; // active frame when exception was thrown
value_t fl_lasterror;
#define FL_TRY \
fl_exception_context_t _ctx; int l__tr, l__ca; \
_ctx.sp=SP; _ctx.frame=curr_frame; _ctx.rdst=readstate; _ctx.prev=fl_ctx; \
_ctx.ngchnd = N_GCHND; fl_ctx = &_ctx; \
if (!setjmp(_ctx.buf)) \
for (l__tr=1; l__tr; l__tr=0, (void)(fl_ctx=fl_ctx->prev))
#define FL_CATCH \
else \
for(l__ca=1; l__ca; l__ca=0, \
fl_lasterror=FL_NIL,fl_throwing_frame=0,SP=_ctx.sp,curr_frame=_ctx.frame)
void fl_savestate(fl_exception_context_t *_ctx)
{
_ctx->sp = SP;
_ctx->frame = curr_frame;
_ctx->rdst = readstate;
_ctx->prev = fl_ctx;
_ctx->ngchnd = N_GCHND;
}
void fl_restorestate(fl_exception_context_t *_ctx)
{
fl_lasterror = FL_NIL;
fl_throwing_frame = 0;
SP = _ctx->sp;
curr_frame = _ctx->frame;
}
void fl_raise(value_t e)
{
fl_lasterror = e;
// unwind read state
while (readstate != (fl_readstate_t*)fl_ctx->rdst) {
free_readstate(readstate);
readstate = readstate->prev;
}
if (fl_throwing_frame == 0)
fl_throwing_frame = curr_frame;
N_GCHND = fl_ctx->ngchnd;
fl_exception_context_t *thisctx = fl_ctx;
if (fl_ctx->prev) // don't throw past toplevel
fl_ctx = fl_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();
fl_raise(fl_list2(e, msg));
}
void lerror(value_t e, const char *msg)
{
PUSH(e);
value_t m = cvalue_static_cstring(msg);
e = POP();
fl_raise(fl_list2(e, m));
}
void type_error(char *fname, char *expected, value_t got)
{
fl_raise(fl_listn(4, TypeError, symbol(fname), symbol(expected), got));
}
void bounds_error(char *fname, value_t arr, value_t ind)
{
fl_raise(fl_listn(4, BoundsError, symbol(fname), arr, ind));
}
// safe cast operators --------------------------------------------------------
#define isstring fl_isstring
#define SAFECAST_OP(type,ctype,cnvt) \
ctype to##type(value_t v, char *fname) \
{ \
if (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)
#undef isstring
// symbol table ---------------------------------------------------------------
symbol_t *symtab = NULL;
int fl_is_keyword_name(const char *str, size_t len)
{
return len>1 && ((str[0] == ':' || str[len-1] == ':') && str[1] != '\0');
}
static symbol_t *mk_symbol(const char *str)
{
symbol_t *sym;
size_t len = strlen(str);
sym = (symbol_t*)malloc((sizeof(symbol_t)-sizeof(void*)+len+1+7)&-8);
assert(((uptrint_t)sym & 0x7) == 0); // make sure malloc aligns 8
sym->left = sym->right = NULL;
sym->flags = 0;
if (fl_is_keyword_name(str, len)) {
value_t s = tagptr(sym, TAG_SYM);
setc(s, s);
sym->flags |= 0x2;
}
else {
sym->binding = UNBOUND;
}
sym->type = NULL;
sym->dlcache = NULL;
sym->hash = memhash32(str, len)^0xAAAAAAAA;
strcpy(&sym->name[0], str);
return sym;
}
static symbol_t **symtab_lookup(symbol_t **ptree, const 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 = symtab_lookup(&symtab, str);
if (*pnode == NULL)
*pnode = mk_symbol(str);
return tagptr(*pnode, TAG_SYM);
}
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 fl_gensym(value_t *args, uint32_t nargs)
{
#ifdef MEMDEBUG2
gsnameno = 1-gsnameno;
char *n = uint2str(gsname[gsnameno]+1, sizeof(gsname[0])-1, _gensym_ctr++, 10);
*(--n) = 'g';
return tagptr(mk_symbol(n), TAG_SYM);
#else
argcount("gensym", nargs, 0);
(void)args;
gensym_t *gs = (gensym_t*)alloc_words(sizeof(gensym_t)/sizeof(void*));
gs->id = _gensym_ctr++;
gs->binding = UNBOUND;
gs->isconst = 0;
gs->type = NULL;
return tagptr(gs, TAG_SYM);
#endif
}
int fl_isgensym(value_t v)
{
return isgensym(v);
}
static value_t fl_gensymp(value_t *args, u_int32_t nargs)
{
argcount("gensym?", nargs, 1);
return isgensym(args[0]) ? FL_T : FL_F;
}
char *symbol_name(value_t v)
{
#ifndef MEMDEBUG2
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;
}
#endif
return ((symbol_t*)ptr(v))->name;
}
// conses ---------------------------------------------------------------------
#ifdef MEMDEBUG2
static void *tochain=NULL;
static long long n_allocd=0;
#define GC_INTERVAL 100000
#endif
void gc(int mustgrow);
static value_t mk_cons(void)
{
cons_t *c;
#ifdef MEMDEBUG2
if (n_allocd > GC_INTERVAL)
gc(0);
c = (cons_t*)((void**)malloc(3*sizeof(void*)) + 1);
((void**)c)[-1] = tochain;
tochain = c;
n_allocd += sizeof(cons_t);
#else
if (__unlikely(curheap > lim))
gc(0);
c = (cons_t*)curheap;
curheap += sizeof(cons_t);
#endif
return tagptr(c, TAG_CONS);
}
static value_t *alloc_words(int n)
{
value_t *first;
assert(n > 0);
n = LLT_ALIGN(n, 2); // only allocate multiples of 2 words
#ifdef MEMDEBUG2
if (n_allocd > GC_INTERVAL)
gc(0);
first = (value_t*)malloc((n+1)*sizeof(value_t)) + 1;
first[-1] = (value_t)tochain;
tochain = first;
n_allocd += (n*sizeof(value_t));
#else
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));
#endif
return first;
}
// allocate n consecutive conses
#ifndef MEMDEBUG2
#define cons_reserve(n) tagptr(alloc_words((n)*2), TAG_CONS)
#endif
#ifndef MEMDEBUG2
#define cons_index(c) (((cons_t*)ptr(c))-((cons_t*)fromspace))
#endif
#ifdef MEMDEBUG2
#define ismarked(c) ((((value_t*)ptr(c))[-1]&1) != 0)
#define mark_cons(c) ((((value_t*)ptr(c))[-1]) |= 1)
#define unmark_cons(c) ((((value_t*)ptr(c))[-1]) &= (~(value_t)1))
#else
#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)
#endif
static value_t the_empty_vector;
value_t alloc_vector(size_t n, int init)
{
if (n == 0) return the_empty_vector;
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) = FL_UNSPECIFIED;
}
return v;
}
// cvalues --------------------------------------------------------------------
#include "cvalues.c"
#include "types.c"
// print ----------------------------------------------------------------------
static int isnumtok(char *tok, value_t *pval);
static inline int symchar(char c);
#include "print.c"
// collector ------------------------------------------------------------------
void fl_gc_handle(value_t *pv)
{
if (N_GCHND >= N_GC_HANDLES)
lerror(MemoryError, "out of gc handles");
GCHandleStack[N_GCHND++] = pv;
}
void fl_free_gc_handles(uint32_t n)
{
assert(N_GCHND >= n);
N_GCHND -= n;
}
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;
}
#ifdef MEMDEBUG2
*pcdr = nc = mk_cons();
#else
*pcdr = nc = tagptr((cons_t*)curheap, TAG_CONS);
curheap += sizeof(cons_t);
#endif
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, sz = vector_size(v);
if (vector_elt(v,-1) & 0x1) {
// grown vector
nc = relocate(vector_elt(v,0));
forward(v, nc);
}
else {
nc = tagptr(alloc_words(sz+1), TAG_VECTOR);
vector_setsize(nc, sz);
a = vector_elt(v,0);
forward(v, nc);
if (sz > 0) {
vector_elt(nc,0) = relocate(a);
for(i=1; i < sz; i++)
vector_elt(nc,i) = relocate(vector_elt(v,i));
}
}
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_FUNCTION) {
function_t *fn = (function_t*)ptr(v);
function_t *nfn = (function_t*)alloc_words(4);
nfn->bcode = fn->bcode;
nfn->vals = fn->vals;
nc = tagptr(nfn, TAG_FUNCTION);
forward(v, nc);
nfn->env = relocate(fn->env);
nfn->vals = relocate(nfn->vals);
nfn->bcode = relocate(nfn->bcode);
nfn->name = fn->name;
return nc;
}
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->isconst = 0;
nc = tagptr(ng, TAG_SYM);
forward(v, nc);
if (ng->binding != UNBOUND)
ng->binding = relocate(ng->binding);
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);
trace_globals(root->left);
root = root->right;
}
}
static value_t memory_exception_value;
void gc(int mustgrow)
{
void *temp;
uint32_t i, f, top;
fl_readstate_t *rs;
#ifdef MEMDEBUG2
temp = tochain;
tochain = NULL;
n_allocd = -100000000000LL;
#else
static int grew = 0;
size_t hsz = grew ? heapsize*2 : heapsize;
#ifdef MEMDEBUG
tospace = LLT_ALLOC(hsz);
#endif
curheap = tospace;
lim = curheap + hsz - sizeof(cons_t);
#endif
if (fl_throwing_frame > curr_frame) {
top = fl_throwing_frame - 4;
f = Stack[fl_throwing_frame-4];
}
else {
top = SP;
f = curr_frame;
}
while (1) {
for (i=f; i < top; i++)
Stack[i] = relocate(Stack[i]);
if (f == 0) break;
top = f - 4;
f = Stack[f-4];
}
for (i=0; i < N_GCHND; i++)
*GCHandleStack[i] = relocate(*GCHandleStack[i]);
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;
}
fl_lasterror = relocate(fl_lasterror);
memory_exception_value = relocate(memory_exception_value);
the_empty_vector = relocate(the_empty_vector);
sweep_finalizers();
#ifdef MEMDEBUG2
while (temp != NULL) {
void *next = ((void**)temp)[-1];
free(&((void**)temp)[-1]);
temp = next;
}
n_allocd = 0;
#else
#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 = (unsigned char*)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 || mustgrow
#ifdef MEMDEBUG
// GC more often
|| ((lim-curheap) < (int)(heapsize/128))
#else
|| ((lim-curheap) < (int)(heapsize/5))
#endif
) {
temp = LLT_REALLOC(tospace, heapsize*2);
if (temp == NULL)
fl_raise(memory_exception_value);
tospace = (unsigned char*)temp;
if (grew) {
heapsize*=2;
temp = bitvector_resize(consflags, 0, heapsize/sizeof(cons_t), 1);
if (temp == NULL)
fl_raise(memory_exception_value);
consflags = (uint32_t*)temp;
}
grew = !grew;
}
#ifdef MEMDEBUG
LLT_FREE(tospace);
#endif
if (curheap > lim) // all data was live
gc(0);
#endif
}
static void grow_stack(void)
{
size_t newsz = N_STACK + (N_STACK>>1);
value_t *ns = (value_t*)realloc(Stack, newsz*sizeof(value_t));
if (ns == NULL)
lerror(MemoryError, "stack overflow");
Stack = ns;
N_STACK = newsz;
}
// utils ----------------------------------------------------------------------
// apply function with n args on the stack
static value_t _applyn(uint32_t n)
{
value_t f = Stack[SP-n-1];
uint32_t saveSP = SP;
value_t v;
if (iscbuiltin(f)) {
v = ((builtin_t*)ptr(f))[3](&Stack[SP-n], n);
}
else if (isfunction(f)) {
v = apply_cl(n);
}
else if (isbuiltin(f)) {
value_t tab = symbol_value(builtins_table_sym);
Stack[SP-n-1] = vector_elt(tab, uintval(f));
v = apply_cl(n);
}
else {
type_error("apply", "function", f);
}
SP = saveSP;
return v;
}
value_t fl_apply(value_t f, value_t l)
{
value_t v = l;
uint32_t n = SP;
PUSH(f);
while (iscons(v)) {
if (SP >= N_STACK)
grow_stack();
PUSH(car_(v));
v = cdr_(v);
}
n = SP - n - 1;
v = _applyn(n);
POPN(n+1);
return v;
}
value_t fl_applyn(uint32_t n, value_t f, ...)
{
va_list ap;
va_start(ap, f);
size_t i;
PUSH(f);
while (SP+n > N_STACK)
grow_stack();
for(i=0; i < n; i++) {
value_t a = va_arg(ap, value_t);
PUSH(a);
}
value_t v = _applyn(n);
POPN(n+1);
va_end(ap);
return v;
}
value_t fl_listn(size_t n, ...)
{
va_list ap;
va_start(ap, n);
uint32_t si = SP;
size_t i;
while (SP+n > N_STACK)
grow_stack();
for(i=0; i < n; i++) {
value_t a = va_arg(ap, value_t);
PUSH(a);
}
#ifdef MEMDEBUG2
si = SP-1;
value_t l = NIL;
for(i=0; i < n; i++) {
l = fl_cons(Stack[si--], l);
}
POPN(n);
va_end(ap);
return l;
#else
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);
#endif
}
value_t fl_list2(value_t a, value_t b)
{
PUSH(a);
PUSH(b);
#ifdef MEMDEBUG2
Stack[SP-1] = fl_cons(b, NIL);
a = fl_cons(Stack[SP-2], Stack[SP-1]);
POPN(2);
return a;
#else
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);
#endif
}
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;
}
int fl_isnumber(value_t v)
{
if (isfixnum(v)) return 1;
if (iscprim(v)) {
cprim_t *c = (cprim_t*)ptr(v);
return c->type != wchartype;
}
return 0;
}
// read -----------------------------------------------------------------------
#include "read.c"
// equal ----------------------------------------------------------------------
#include "equal.c"
// eval -----------------------------------------------------------------------
#define list(a,n) _list((a),(n),0)
static value_t _list(value_t *args, uint32_t nargs, int star)
{
cons_t *c;
int i;
value_t v;
#ifdef MEMDEBUG2
value_t n;
i = nargs-1;
if (star) {
n = mk_cons();
c = (cons_t*)ptr(n);
c->car = args[i-1];
c->cdr = args[i];
i -= 2;
v = n;
}
else {
v = NIL;
}
PUSH(v);
for(; i >= 0; i--) {
n = mk_cons();
c = (cons_t*)ptr(n);
c->car = args[i];
c->cdr = Stack[SP-1];
Stack[SP-1] = n;
}
v = POP();
#else
v = cons_reserve(nargs);
c = (cons_t*)ptr(v);
for(i=0; i < nargs; i++) {
c->car = args[i];
c->cdr = tagptr(c+1, TAG_CONS);
c++;
}
if (star)
(c-2)->cdr = (c-1)->car;
else
(c-1)->cdr = NIL;
#endif
return v;
}
static value_t copy_list(value_t L)
{
if (!iscons(L))
return NIL;
PUSH(NIL);
PUSH(L);
value_t *plcons = &Stack[SP-2];
value_t *pL = &Stack[SP-1];
value_t c;
c = mk_cons(); PUSH(c); // save first cons
car_(c) = car_(*pL);
cdr_(c) = NIL;
*plcons = c;
*pL = cdr_(*pL);
while (iscons(*pL)) {
c = mk_cons();
car_(c) = car_(*pL);
cdr_(c) = NIL;
cdr_(*plcons) = c;
*plcons = c;
*pL = cdr_(*pL);
}
c = POP(); // first cons
POPN(2);
return c;
}
static value_t do_trycatch(void)
{
uint32_t saveSP = SP;
value_t v;
value_t thunk = Stack[SP-2];
Stack[SP-2] = Stack[SP-1];
Stack[SP-1] = thunk;
FL_TRY {
v = apply_cl(0);
}
FL_CATCH {
v = Stack[saveSP-2];
PUSH(v);
PUSH(fl_lasterror);
v = apply_cl(1);
}
SP = saveSP;
return v;
}
/*
argument layout on stack is
|--required args--|--opt args--|--kw args--|--rest args...
*/
static uint32_t process_keys(value_t kwtable,
uint32_t nreq, uint32_t nkw, uint32_t nopt,
uint32_t bp, uint32_t nargs, int va)
{
uptrint_t n;
uint32_t extr = nopt+nkw;
uint32_t ntot = nreq+extr;
value_t *args = (value_t*)alloca(extr*sizeof(value_t));
value_t v;
uint32_t i, a = 0, nrestargs;
value_t s1 = Stack[SP-1];
value_t s2 = Stack[SP-2];
value_t s4 = Stack[SP-4];
value_t s5 = Stack[SP-5];
if (nargs < nreq)
lerror(ArgError, "apply: too few arguments");
for (i=0; i < extr; i++) args[i] = UNBOUND;
for (i=nreq; i < nargs; i++) {
v = Stack[bp+i];
if (issymbol(v) && iskeyword((symbol_t*)ptr(v)))
break;
if (a >= nopt)
goto no_kw;
args[a++] = v;
}
if (i >= nargs) goto no_kw;
// now process keywords
n = vector_size(kwtable)/2;
do {
i++;
if (i >= nargs)
lerrorf(ArgError, "keyword %s requires an argument",
symbol_name(v));
value_t hv = fixnum(((symbol_t*)ptr(v))->hash);
uptrint_t x = 2*(labs(numval(hv)) % n);
if (vector_elt(kwtable, x) == v) {
uptrint_t idx = numval(vector_elt(kwtable, x+1));
assert(idx < nkw);
idx += nopt;
if (args[idx] == UNBOUND) {
// if duplicate key, keep first value
args[idx] = Stack[bp+i];
}
}
else {
lerrorf(ArgError, "unsupported keyword %s", symbol_name(v));
}
i++;
if (i >= nargs) break;