ref: ca88d4dfc3831931281ca357af4413aa5385bd5d
dir: /flisp.c/
/*
femtoLisp
by Jeff Bezanson (C) 2009
Distributed under the BSD License
*/
#include "llt.h"
#include "flisp.h"
#include "operators.h"
#include "cvalues.h"
#include "opcodes.h"
#include "types.h"
#include "print.h"
#include "read.h"
#include "equal.h"
#include "hashing.h"
#include "table.h"
#include "iostream.h"
typedef struct {
char *name;
builtin_t fptr;
}builtinspec_t;
#define N_GC_HANDLES 1024
static value_t *GCHandleStack[N_GC_HANDLES];
static uint32_t N_GCHND = 0;
uint32_t N_STACK;
value_t *Stack;
uint32_t SP = 0;
uint32_t curr_frame = 0;
char *curr_fname = nil;
value_t FL_NIL, FL_T, FL_F, FL_EOF, QUOTE;
value_t NIL, LAMBDA, IF, TRYCATCH;
value_t BACKQUOTE, COMMA, COMMAAT, COMMADOT, FUNCTION;
value_t printwidthsym, printreadablysym, printprettysym, printlengthsym;
value_t printlevelsym, builtins_table_sym;
value_t pairsym, symbolsym, fixnumsym, vectorsym, builtinsym, vu8sym;
value_t definesym, defmacrosym, forsym, setqsym;
value_t tsym, Tsym, fsym, Fsym, booleansym, nullsym, evalsym, fnsym;
// for reading characters
value_t nulsym, alarmsym, backspacesym, tabsym, linefeedsym, newlinesym;
value_t vtabsym, pagesym, returnsym, escsym, spacesym, deletesym;
value_t IOError, ParseError, TypeError, ArgError, MemoryError;
value_t DivideError, BoundsError, Error, KeyError, EnumerationError;
static value_t UnboundError;
uint8_t *fromspace;
uint8_t *tospace;
uint8_t *curheap;
uint8_t *lim;
uint32_t heapsize;//bytes
uint32_t *consflags;
int
isbuiltin(value_t x)
{
int i = uintval(x);
return tag(x) == TAG_FUNCTION && i < nelem(builtins) && builtins[i].name != nil;
}
static value_t apply_cl(uint32_t nargs);
// error utilities ------------------------------------------------------------
fl_readstate_t *readstate = nil;
void
free_readstate(fl_readstate_t *rs)
{
htable_free(&rs->backrefs);
htable_free(&rs->gensyms);
}
// saved execution state for an unwind target
fl_exception_context_t *fl_ctx = nil;
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_INC \
l__ca = 0, fl_lasterror = FL_NIL, fl_throwing_frame = 0, SP = _ctx.sp, curr_frame = _ctx.frame
#define FL_CATCH \
else \
for(l__ca = 1; l__ca; FL_CATCH_INC)
#define FL_CATCH_NO_INC \
else \
for(l__ca = 1; l__ca;)
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;
}
_Noreturn void
fl_raise(value_t e)
{
fl_lasterror = e;
// unwind read state
while(readstate != 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], *s;
int n;
if(curr_fname != nil){
n = snprintf(msgbuf, sizeof(msgbuf), "%s: ", curr_fname);
curr_fname = nil;
}else{
n = 0;
}
s = msgbuf + n;
n = sizeof(msgbuf) - n;
vsnprintf(s, n, format, args);
return string_from_cstr(msgbuf);
}
_Noreturn 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));
}
_Noreturn void
type_error(char *expected, value_t got)
{
fl_raise(fl_listn(4, TypeError, symbol(curr_fname), symbol(expected), got));
}
_Noreturn void
bounds_error(value_t arr, value_t ind)
{
fl_raise(fl_listn(4, BoundsError, symbol(curr_fname), arr, ind));
}
_Noreturn void
unbound_error(value_t sym)
{
fl_raise(fl_listn(3, UnboundError, symbol(curr_fname), sym));
}
// safe cast operators --------------------------------------------------------
#define isstring fl_isstring
#define SAFECAST_OP(type, ctype, cnvt) \
ctype to##type(value_t v) \
{ \
if(is##type(v)) \
return (ctype)cnvt(v); \
type_error(#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 = nil;
int
fl_is_keyword_name(char *str, size_t len)
{
return (str[0] == ':' || str[len-1] == ':') && str[1] != '\0';
}
static symbol_t *
mk_symbol(char *str)
{
symbol_t *sym;
size_t len = strlen(str);
sym = calloc(1, sizeof(*sym)-sizeof(void*) + len + 1);
assert(((uintptr_t)sym & 0x7) == 0); // make sure malloc aligns 8
sym->numtype = NONNUMERIC;
if(fl_is_keyword_name(str, len)){
value_t s = tagptr(sym, TAG_SYM);
setc(s, s);
sym->flags |= FLAG_KEYWORD;
}else{
sym->binding = UNBOUND;
}
sym->hash = memhash32(str, len)^0xAAAAAAAA;
memmove(sym->name, str, len+1);
return sym;
}
static symbol_t **
symtab_lookup(symbol_t **ptree, char *str)
{
int x;
while(*ptree != nil && (x = strcmp(str, (*ptree)->name)) != 0)
ptree = x < 0 ? &(*ptree)->left : &(*ptree)->right;
return ptree;
}
value_t
symbol(char *str)
{
symbol_t **pnode;
pnode = symtab_lookup(&symtab, str);
if(*pnode == nil)
*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;
BUILTIN("gensym", gensym)
{
argcount(nargs, 0);
USED(args);
gensym_t *gs = alloc_words(sizeof(gensym_t)/sizeof(void*));
gs->id = _gensym_ctr++;
gs->binding = UNBOUND;
gs->isconst = 0;
gs->type = nil;
return tagptr(gs, TAG_SYM);
}
value_t
gensym(void)
{
return fn_builtin_gensym(nil, 0);
}
BUILTIN("gensym?", gensymp)
{
argcount(nargs, 1);
return isgensym(args[0]) ? FL_T : FL_F;
}
char *
uint2str(char *dest, size_t len, uint64_t num, uint32_t base)
{
int i = len-1;
uint64_t b = (uint64_t)base;
char ch;
dest[i--] = '\0';
while(i >= 0){
ch = (char)(num % b);
if(ch < 10)
ch += '0';
else
ch = ch-10+'a';
dest[i--] = ch;
num /= b;
if(num == 0)
break;
}
return &dest[i+1];
}
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 ---------------------------------------------------------------------
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);
}
void *
alloc_words(int n)
{
value_t *first;
assert(n > 0);
n = LLT_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;
}
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;
}
// collector ------------------------------------------------------------------
void
fl_gc_handle(value_t *pv)
{
if(N_GCHND >= N_GC_HANDLES)
lerrorf(MemoryError, "out of gc handles");
GCHandleStack[N_GCHND++] = pv;
}
void
fl_free_gc_handles(uint32_t n)
{
assert(N_GCHND >= n);
N_GCHND -= n;
}
value_t
relocate(value_t v)
{
value_t a, d, nc, first, *pcdr;
uintptr_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 = tagptr((cons_t*)curheap, TAG_CONS);
curheap += sizeof(cons_t);
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;
}
if(t == TAG_CPRIM){
cprim_t *pcp = ptr(v);
size_t nw = CPRIM_NWORDS-1+NWORDS(cp_class(pcp)->size);
cprim_t *ncp = alloc_words(nw);
while(nw--)
((value_t*)ncp)[nw] = ((value_t*)pcp)[nw];
nc = tagptr(ncp, TAG_CPRIM);
forward(v, nc);
return nc;
}
if(t == TAG_CVALUE)
return cvalue_relocate(v);
if(t == TAG_FUNCTION){
function_t *fn = ptr(v);
function_t *nfn = 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);
assert(!ismanaged(fn->name));
nfn->name = fn->name;
return nc;
}
if(t == TAG_SYM){
gensym_t *gs = ptr(v);
gensym_t *ng = 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 != nil){
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)
{
static int grew = 0;
void *temp;
uint32_t i, f, top;
fl_readstate_t *rs;
curheap = tospace;
if(grew)
lim = curheap+heapsize*2-sizeof(cons_t);
else
lim = curheap+heapsize-sizeof(cons_t);
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){
value_t ent;
for(i = 0; i < rs->backrefs.size; i++){
ent = (value_t)rs->backrefs.table[i];
if(ent != (value_t)HT_NOTFOUND)
rs->backrefs.table[i] = (void*)relocate(ent);
}
for(i = 0; i < rs->gensyms.size; i++){
ent = (value_t)rs->gensyms.table[i];
if(ent != (value_t)HT_NOTFOUND)
rs->gensyms.table[i] = (void*)relocate(ent);
}
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 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 = LLT_REALLOC(tospace, heapsize*2);
if(temp == nil)
fl_raise(memory_exception_value);
tospace = temp;
if(grew){
heapsize *= 2;
temp = bitvector_resize(consflags, 0, heapsize/sizeof(cons_t), 1);
if(temp == nil)
fl_raise(memory_exception_value);
consflags = (uint32_t*)temp;
}
grew = !grew;
}
if(curheap > lim) // all data was live
gc(0);
}
static void
grow_stack(void)
{
size_t newsz = N_STACK * 2;
value_t *ns = LLT_REALLOC(Stack, newsz*sizeof(value_t));
if(ns == nil)
lerrorf(MemoryError, "stack overflow");
Stack = ns;
N_STACK = newsz;
}
// utils ----------------------------------------------------------------------
static char *
cvalue_name(value_t v)
{
cvalue_t *cv = ptr(v);
static char name[64];
value_t label;
void *data = cptr(v);
void *fptr = *(void**)data;
label = (value_t)ptrhash_get(&reverse_dlsym_lookup_table, cv);
if(label == (value_t)HT_NOTFOUND)
snprintf(name, sizeof(name), "#<builtin @%p>", fptr);
else
snprintf(name, sizeof(name), "#fn(%s)", symbol_name(label));
return name;
}
// 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)){
curr_fname = cvalue_name(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);
if(ptr(tab) == nil)
unbound_error(tab);
Stack[SP-n-1] = vector_elt(tab, uintval(f));
curr_fname = builtins[uintval(f)].name;
v = apply_cl(n);
}else{
type_error("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);
}
cons_t *c = 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
fl_list2(value_t a, value_t b)
{
PUSH(a);
PUSH(b);
cons_t *c = 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;
}
int
fl_isnumber(value_t v)
{
if(isfixnum(v))
return 1;
if(iscprim(v)){
cprim_t *c = ptr(v);
return c->type != runetype;
}
if(iscvalue(v)){
cvalue_t *c = ptr(v);
return valid_numtype(cv_class(c)->numtype);
}
return 0;
}
// eval -----------------------------------------------------------------------
static value_t
list(value_t *args, uint32_t nargs, int star)
{
cons_t *c;
uint32_t i;
value_t v;
v = cons_reserve(nargs);
c = 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;
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 = NIL;
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)
{
uint32_t extr = nopt+nkw;
uint32_t ntot = nreq+extr;
value_t args[64], v = NIL;
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)
lerrorf(ArgError, "too few arguments");
if(extr > nelem(args))
lerrorf(ArgError, "too many 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
uintptr_t 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);
lltint_t lx = numval(hv);
uintptr_t x = 2*((lx < 0 ? -lx : lx) % n);
if(vector_elt(kwtable, x) == v){
uintptr_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;
v = Stack[bp+i];
}while(issymbol(v) && iskeyword((symbol_t*)ptr(v)));
no_kw:
nrestargs = nargs - i;
if(!va && nrestargs > 0)
lerrorf(ArgError, "too many arguments");
nargs = ntot + nrestargs;
if(nrestargs)
memmove(&Stack[bp+ntot], &Stack[bp+i], nrestargs*sizeof(value_t));
memmove(&Stack[bp+nreq], args, extr*sizeof(value_t));
SP = bp + nargs;
assert(SP < N_STACK-5);
PUSH(s5);
PUSH(s4);
PUSH(nargs);
PUSH(s2);
PUSH(s1);
curr_frame = SP;
return nargs;
}
#if BYTE_ORDER == BIG_ENDIAN
#define GET_INT32(a) \
((int32_t) \
((((int32_t)a[0])<<0) | \
(((int32_t)a[1])<<8) | \
(((int32_t)a[2])<<16) | \
(((int32_t)a[3])<<24)))
#define GET_INT16(a) \
((int16_t) \
((((int16_t)a[0])<<0) | \
(((int16_t)a[1])<<8)))
#define PUT_INT32(a, i) (*(int32_t*)(a) = bswap_32((int32_t)(i)))
#else
#define GET_INT32(a) (*(int32_t*)a)
#define GET_INT16(a) (*(int16_t*)a)
#define PUT_INT32(a, i) (*(int32_t*)(a) = (int32_t)(i))
#endif
#define OP(x) case x:
#define NEXT_OP break
/*
stack on entry: <func> <nargs args...>
caller's responsibility:
- put the stack in this state
- provide arg count
- respect tail position
- restore SP
callee's responsibility:
- check arg counts
- allocate vararg array
- push closed env, set up new environment
*/
static value_t
apply_cl(uint32_t nargs)
{
uint32_t top_frame = curr_frame;
// frame variables
uint32_t n, captured;
uint32_t bp;
const uint8_t *ip;
fixnum_t s, hi;
int tail;
// temporary variables (not necessary to preserve across calls)
uint32_t op, i;
symbol_t *sym;
cons_t *c;
value_t *pv;
int64_t accum;
value_t func, v, e;
n = 0;
v = 0;
USED(n);
USED(v);
apply_cl_top:
captured = 0;
func = Stack[SP-nargs-1];
ip = cv_data((cvalue_t*)ptr(fn_bcode(func)));
assert(!ismanaged((uintptr_t)ip));
while(SP+GET_INT32(ip) > N_STACK)
grow_stack();
ip += 4;
bp = SP-nargs;
PUSH(fn_env(func));
PUSH(curr_frame);
PUSH(nargs);
SP++;//PUSH(0); //ip
PUSH(0); //captured?
curr_frame = SP;
op = *ip++;
while(1){
if(op < nelem(builtins) && builtins[op].name != nil)
curr_fname = builtins[op].name;
switch(op){
OP(OP_LOADA0)
PUSH(captured ? vector_elt(Stack[bp], 0) : Stack[bp]);
NEXT_OP;
OP(OP_LOADA1)
PUSH(captured ? vector_elt(Stack[bp], 1) : Stack[bp+1]);
NEXT_OP;
OP(OP_LOADV)
v = fn_vals(Stack[bp-1]);
assert(*ip < vector_size(v));
PUSH(vector_elt(v, *ip++));
NEXT_OP;
OP(OP_BRF)
ip += POP() == FL_F ? GET_INT16(ip) : 2;
NEXT_OP;
OP(OP_POP)
POPN(1);
NEXT_OP;
OP(OP_TCALLL)
tail = 1;
if(0){
OP(OP_CALLL)
tail = 0;
}
n = GET_INT32(ip);
ip += 4;
if(0){
OP(OP_TCALL)
tail = 1;
if(0){
OP(OP_CALL)
tail = 0;
}
n = *ip++; // nargs
}
do_call:
func = Stack[SP-n-1];
if(tag(func) == TAG_FUNCTION){
if(func > (N_BUILTINS<<3)){
if(tail){
curr_frame = Stack[curr_frame-4];
for(s = -1; s < (fixnum_t)n; s++)
Stack[bp+s] = Stack[SP-n+s];
SP = bp+n;
}else{
Stack[curr_frame-2] = (uintptr_t)ip;
}
nargs = n;
function_t *fn = (function_t*)ptr(func);
curr_fname = fn->name == LAMBDA ? "λ" : symbol_name(fn->name);
goto apply_cl_top;
}else{
i = uintval(func);
if(isbuiltin(func)){
s = builtins[i].nargs;
if(s >= 0)
argcount(n, s);
else if(s != ANYARGS && (signed)n < -s)
argcount(n, -s);
// remove function arg
for(s = SP-n-1; s < (int)SP-1; s++)
Stack[s] = Stack[s+1];
SP--;
curr_fname = builtins[i].name;
switch(i){
case OP_LIST: goto apply_list;
case OP_VECTOR: goto apply_vector;
case OP_APPLY: goto apply_apply;
case OP_ADD: goto apply_add;
case OP_SUB: goto apply_sub;
case OP_MUL: goto apply_mul;
case OP_DIV: goto apply_div;
default:
op = i;
continue;
}
}
}
}else if(iscbuiltin(func)){
s = SP;
curr_fname = cvalue_name(func);
v = (((builtin_t*)ptr(func))[3])(&Stack[SP-n], n);
SP = s-n;
Stack[SP-1] = v;
NEXT_OP;
}
type_error("function", func);
OP(OP_LOADGL)
v = fn_vals(Stack[bp-1]);
v = vector_elt(v, GET_INT32(ip));
ip += 4;
if(0){
OP(OP_LOADG)
v = fn_vals(Stack[bp-1]);
assert(*ip < vector_size(v));
v = vector_elt(v, *ip);
ip++;
}
assert(issymbol(v));
sym = (symbol_t*)ptr(v);
if(sym->binding == UNBOUND)
unbound_error(v);
PUSH(sym->binding);
NEXT_OP;
OP(OP_LOADA)
assert(nargs > 0);
i = *ip++;
if(captured){
e = Stack[bp];
assert(isvector(e));
assert(i < vector_size(e));
v = vector_elt(e, i);
}else{
v = Stack[bp+i];
}
PUSH(v);
NEXT_OP;
OP(OP_LOADC)
s = *ip++;
i = *ip++;
v = Stack[bp+nargs];
while(s--)
v = vector_elt(v, vector_size(v)-1);
assert(isvector(v));
assert(i < vector_size(v));
PUSH(vector_elt(v, i));
NEXT_OP;
OP(OP_RET)
v = POP();
SP = curr_frame;
curr_frame = Stack[SP-4];
if(curr_frame == top_frame)
return v;
SP -= 5+nargs;
captured = Stack[curr_frame-1];
ip = (uint8_t*)Stack[curr_frame-2];
nargs = Stack[curr_frame-3];
bp = curr_frame - 5 - nargs;
Stack[SP-1] = v;
NEXT_OP;
OP(OP_DUP)
SP++;
Stack[SP-1] = Stack[SP-2];
NEXT_OP;
OP(OP_CAR)
v = Stack[SP-1];
if(!iscons(v))
type_error("cons", v);
Stack[SP-1] = car_(v);
NEXT_OP;
OP(OP_CDR)
v = Stack[SP-1];
if(!iscons(v))
type_error("cons", v);
Stack[SP-1] = cdr_(v);
NEXT_OP;
OP(OP_CLOSURE)
// build a closure (lambda args body . env)
if(nargs > 0 && !captured){
// save temporary environment to the heap
n = nargs;
pv = alloc_words(n + 2);
PUSH(tagptr(pv, TAG_VECTOR));
pv[0] = fixnum(n+1);
pv++;
do{
pv[n] = Stack[bp+n];
}while(n--);
// environment representation changed; install
// the new representation so everybody can see it
captured = 1;
Stack[curr_frame-1] = 1;
Stack[bp] = Stack[SP-1];
}else{
PUSH(Stack[bp]); // env has already been captured; share
}
if(curheap > lim-2)
gc(0);
pv = (value_t*)curheap;
curheap += (4*sizeof(value_t));
e = Stack[SP-2]; // closure to copy
assert(isfunction(e));
pv[0] = ((value_t*)ptr(e))[0];
pv[1] = ((value_t*)ptr(e))[1];
pv[2] = Stack[SP-1]; // env
pv[3] = ((value_t*)ptr(e))[3];
POPN(1);
Stack[SP-1] = tagptr(pv, TAG_FUNCTION);
NEXT_OP;
OP(OP_SETA)
assert(nargs > 0);
v = Stack[SP-1];
i = *ip++;
if(captured){
e = Stack[bp];
assert(isvector(e));
assert(i < vector_size(e));
vector_elt(e, i) = v;
}else{
Stack[bp+i] = v;
}
NEXT_OP;
OP(OP_JMP)
ip += GET_INT16(ip);
NEXT_OP;
OP(OP_LOADC00)
PUSH(vector_elt(Stack[bp+nargs], 0));
NEXT_OP;
OP(OP_PAIRP)
Stack[SP-1] = iscons(Stack[SP-1]) ? FL_T : FL_F;
NEXT_OP;
OP(OP_BRNE)
ip += Stack[SP-2] != Stack[SP-1] ? GET_INT16(ip) : 2;
POPN(2);
NEXT_OP;
OP(OP_LOADT)
PUSH(FL_T);
NEXT_OP;
OP(OP_LOAD0)
PUSH(fixnum(0));
NEXT_OP;
OP(OP_LOADC01)
PUSH(vector_elt(Stack[bp+nargs], 1));
NEXT_OP;
OP(OP_AREF)
v = Stack[SP-2];
if(isvector(v)){
e = Stack[SP-1];
i = isfixnum(e) ? numval(e) : (uint32_t)toulong(e);
if(i < 0 || i >= vector_size(v))
bounds_error(v, e);
v = vector_elt(v, i);
}else if(isarray(v)){
v = cvalue_array_aref(&Stack[SP-2]);
}else{
type_error("sequence", v);
}
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_ATOMP)
Stack[SP-1] = iscons(Stack[SP-1]) ? FL_F : FL_T;
NEXT_OP;
OP(OP_BRT)
ip += POP() != FL_F ? GET_INT16(ip) : 2;
NEXT_OP;
OP(OP_BRNN)
ip += POP() != NIL ? GET_INT16(ip) : 2;
NEXT_OP;
OP(OP_LOAD1)
PUSH(fixnum(1));
NEXT_OP;
OP(OP_LT)
if(bothfixnums(Stack[SP-2], Stack[SP-1]))
v = numval(Stack[SP-2]) < numval(Stack[SP-1]) ? FL_T : FL_F;
else
v = numval(fl_compare(Stack[SP-2], Stack[SP-1])) < 0 ? FL_T : FL_F;
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_ADD2)
if(bothfixnums(Stack[SP-1], Stack[SP-2])){
s = numval(Stack[SP-1]) + numval(Stack[SP-2]);
v = fits_fixnum(s) ? fixnum(s) : mk_xlong(s);
}else{
v = fl_add_any(&Stack[SP-2], 2, 0);
}
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_SETCDR)
cdr(Stack[SP-2]) = Stack[SP-1];
POPN(1);
NEXT_OP;
OP(OP_LOADF)
PUSH(FL_F);
NEXT_OP;
OP(OP_CONS)
if(curheap > lim)
gc(0);
c = (cons_t*)curheap;
curheap += sizeof(cons_t);
c->car = Stack[SP-2];
c->cdr = Stack[SP-1];
Stack[SP-2] = tagptr(c, TAG_CONS);
POPN(1); NEXT_OP;
OP(OP_EQ)
Stack[SP-2] = Stack[SP-2] == Stack[SP-1] ? FL_T : FL_F;
POPN(1);
NEXT_OP;
OP(OP_SYMBOLP)
Stack[SP-1] = issymbol(Stack[SP-1]) ? FL_T : FL_F;
NEXT_OP;
OP(OP_NOT)
Stack[SP-1] = Stack[SP-1] == FL_F ? FL_T : FL_F;
NEXT_OP;
OP(OP_CADR)
v = Stack[SP-1];
if(!iscons(v))
type_error("cons", v);
v = cdr_(v);
if(!iscons(v))
type_error("cons", v);
Stack[SP-1] = car_(v);
NEXT_OP;
OP(OP_NEG)
do_neg:
Stack[SP-1] = fl_neg(Stack[SP-1]);
NEXT_OP;
OP(OP_NULLP)
Stack[SP-1] = Stack[SP-1] == NIL ? FL_T : FL_F;
NEXT_OP;
OP(OP_BOOLEANP)
v = Stack[SP-1];
Stack[SP-1] = (v == FL_T || v == FL_F) ? FL_T : FL_F;
NEXT_OP;
OP(OP_NUMBERP)
v = Stack[SP-1];
Stack[SP-1] = fl_isnumber(v) ? FL_T:FL_F;
NEXT_OP;
OP(OP_FIXNUMP)
Stack[SP-1] = isfixnum(Stack[SP-1]) ? FL_T : FL_F;
NEXT_OP;
OP(OP_BOUNDP)
sym = tosymbol(Stack[SP-1]);
Stack[SP-1] = sym->binding == UNBOUND ? FL_F : FL_T;
NEXT_OP;
OP(OP_BUILTINP)
v = Stack[SP-1];
Stack[SP-1] = (isbuiltin(v) || iscbuiltin(v)) ? FL_T : FL_F;
NEXT_OP;
OP(OP_FUNCTIONP)
v = Stack[SP-1];
Stack[SP-1] = ((tag(v) == TAG_FUNCTION &&
(isbuiltin(v) || v>(N_BUILTINS<<3))) ||
iscbuiltin(v)) ? FL_T : FL_F;
NEXT_OP;
OP(OP_VECTORP)
Stack[SP-1] = isvector(Stack[SP-1]) ? FL_T : FL_F;
NEXT_OP;
OP(OP_JMPL)
ip += GET_INT32(ip);
NEXT_OP;
OP(OP_BRFL)
ip += POP() == FL_F ? GET_INT32(ip) : 4;
NEXT_OP;
OP(OP_BRTL)
ip += POP() != FL_F ? GET_INT32(ip) : 4;
NEXT_OP;
OP(OP_BRNEL)
ip += Stack[SP-2] != Stack[SP-1] ? GET_INT32(ip) : 4;
POPN(2);
NEXT_OP;
OP(OP_BRNNL)
ip += POP() != NIL ? GET_INT32(ip) : 4;
NEXT_OP;
OP(OP_BRN)
ip += POP() == NIL ? GET_INT16(ip) : 2;
NEXT_OP;
OP(OP_BRNL)
ip += POP() == NIL ? GET_INT32(ip) : 4;
NEXT_OP;
OP(OP_EQV)
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 = compare_(Stack[SP-2], Stack[SP-1], 1) == 0 ? FL_T : FL_F;
Stack[SP-2] = v;
POPN(1);
NEXT_OP;
OP(OP_EQUAL)
if(Stack[SP-2] == Stack[SP-1])
v = FL_T;
else
v = compare_(Stack[SP-2], Stack[SP-1], 1) == 0 ? FL_T : FL_F;
Stack[SP-2] = v;
POPN(1);
NEXT_OP;
OP(OP_SETCAR)
car(Stack[SP-2]) = Stack[SP-1];
POPN(1);
NEXT_OP;
OP(OP_LIST)
n = *ip++;
apply_list:
if(n > 0){
v = list(&Stack[SP-n], n, 0);
POPN(n);
PUSH(v);
}else{
PUSH(NIL);
}
NEXT_OP;
OP(OP_TAPPLY)
tail = 1;
if(0){
OP(OP_APPLY)
tail = 0;
}
n = *ip++;
apply_apply:
v = POP(); // arglist
n = SP-(n-2); // n-2 == # leading arguments not in the list
while(iscons(v)){
if(SP >= N_STACK)
grow_stack();
PUSH(car_(v));
v = cdr_(v);
}
n = SP-n;
goto do_call;
OP(OP_ADD)
n = *ip++;
apply_add:
s = 0;
i = SP-n;
for(; i < SP; i++){
if(isfixnum(Stack[i])){
s += numval(Stack[i]);
if(!fits_fixnum(s)){
i++;
goto add_ovf;
}
}else{
add_ovf:
v = fl_add_any(&Stack[i], SP-i, s);
break;
}
}
if(i == SP)
v = fixnum(s);
POPN(n);
PUSH(v);
NEXT_OP;
OP(OP_SUB)
n = *ip++;
apply_sub:
if(n == 2)
goto do_sub2;
if(n == 1)
goto do_neg;
i = SP-n;
// 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], n, 0));
Stack[i] = POP();
v = fl_add_any(&Stack[i], 2, 0);
POPN(n);
PUSH(v);
NEXT_OP;
OP(OP_SUB2)
do_sub2:
if(bothfixnums(Stack[SP-2], Stack[SP-1])){
s = numval(Stack[SP-2]) - numval(Stack[SP-1]);
v = fits_fixnum(s) ? fixnum(s) : mk_xlong(s);
}else{
Stack[SP-1] = fl_neg(Stack[SP-1]);
v = fl_add_any(&Stack[SP-2], 2, 0);
}
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_MUL)
n = *ip++;
apply_mul:
accum = 1;
for(i = SP-n; i < SP; i++){
if(isfixnum(Stack[i])){
accum *= numval(Stack[i]);
}else{
v = fl_mul_any(&Stack[i], SP-i, accum);
break;
}
}
if(i == SP)
v = fits_fixnum(accum) ? fixnum(accum) : return_from_int64(accum);
POPN(n);
PUSH(v);
NEXT_OP;
OP(OP_DIV)
n = *ip++;
apply_div:
i = SP-n;
if(n == 1){
Stack[SP-1] = fl_div2(fixnum(1), Stack[i]);
}else{
if(n > 2){
PUSH(Stack[i]);
Stack[i] = fixnum(1);
Stack[i+1] = fl_mul_any(&Stack[i], n, 1);
Stack[i] = POP();
}
v = fl_div2(Stack[i], Stack[i+1]);
POPN(n);
PUSH(v);
}
NEXT_OP;
OP(OP_IDIV)
v = Stack[SP-2]; e = Stack[SP-1];
if(bothfixnums(v, e)){
if(e == 0)
DivideByZeroError();
v = fixnum(numval(v) / numval(e));
}else
v = fl_idiv2(v, e);
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_NUMEQ)
v = Stack[SP-2]; e = Stack[SP-1];
if(bothfixnums(v, e))
v = v == e ? FL_T : FL_F;
else
v = numeric_compare(v, e, 1, 0, 1) == 0 ? FL_T : FL_F;
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_COMPARE)
Stack[SP-2] = compare_(Stack[SP-2], Stack[SP-1], 0);
POPN(1);
NEXT_OP;
OP(OP_ARGC)
n = *ip++;
if(0){
OP(OP_LARGC)
n = GET_INT32(ip);
ip += 4;
}
argcount(nargs, n);
NEXT_OP;
OP(OP_VECTOR)
n = *ip++;
apply_vector:
v = alloc_vector(n, 0);
if(n){
memmove(&vector_elt(v, 0), &Stack[SP-n], n*sizeof(value_t));
POPN(n);
}
PUSH(v);
NEXT_OP;
OP(OP_ASET)
e = Stack[SP-3];
if(isvector(e)){
i = tofixnum(Stack[SP-2]);
if(i < 0 || i >= vector_size(e))
bounds_error(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("sequence", e);
}
POPN(2);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_FOR)
s = tofixnum(Stack[SP-3]);
hi = tofixnum(Stack[SP-2]);
//f = Stack[SP-1];
v = FL_UNSPECIFIED;
SP += 2;
n = SP;
for(; s <= hi; s++){
Stack[SP-2] = Stack[SP-3];
Stack[SP-1] = fixnum(s);
v = apply_cl(1);
SP = n;
}
POPN(4);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_LOADNIL)
PUSH(NIL);
NEXT_OP;
OP(OP_LOADI8)
s = (int8_t)*ip++;
PUSH(fixnum(s));
NEXT_OP;
OP(OP_LOADVL)
v = fn_vals(Stack[bp-1]);
v = vector_elt(v, GET_INT32(ip));
ip += 4;
PUSH(v);
NEXT_OP;
OP(OP_SETGL)
v = fn_vals(Stack[bp-1]);
v = vector_elt(v, GET_INT32(ip));
ip += 4;
if(0){
OP(OP_SETG)
v = fn_vals(Stack[bp-1]);
assert(*ip < vector_size(v));
v = vector_elt(v, *ip);
ip++;
}
assert(issymbol(v));
sym = (symbol_t*)ptr(v);
v = Stack[SP-1];
if(!isconstant(sym))
sym->binding = v;
NEXT_OP;
OP(OP_LOADAL)
assert(nargs > 0);
i = GET_INT32(ip);
ip += 4;
v = captured ? vector_elt(Stack[bp], i) : Stack[bp+i];
PUSH(v);
NEXT_OP;
OP(OP_SETAL)
assert(nargs > 0);
v = Stack[SP-1];
i = GET_INT32(ip);
ip += 4;
if(captured)
vector_elt(Stack[bp], i) = v;
else
Stack[bp+i] = v;
NEXT_OP;
OP(OP_SETC)
s = *ip++;
i = *ip++;
v = Stack[bp+nargs];
while(s--)
v = vector_elt(v, vector_size(v)-1);
assert(isvector(v));
assert(i < vector_size(v));
vector_elt(v, i) = Stack[SP-1];
NEXT_OP;
OP(OP_LOADCL)
s = GET_INT32(ip);
ip += 4;
i = GET_INT32(ip);
ip += 4;
v = Stack[bp+nargs];
while(s--)
v = vector_elt(v, vector_size(v)-1);
PUSH(vector_elt(v, i));
NEXT_OP;
OP(OP_SETCL)
s = GET_INT32(ip);
ip += 4;
i = GET_INT32(ip);
ip += 4;
v = Stack[bp+nargs];
while(s--)
v = vector_elt(v, vector_size(v)-1);
assert(i < vector_size(v));
vector_elt(v, i) = Stack[SP-1];
NEXT_OP;
OP(OP_VARGC)
i = *ip++;
if(0){
OP(OP_LVARGC)
i = GET_INT32(ip);
ip += 4;
}
s = (fixnum_t)nargs - (fixnum_t)i;
if(s > 0){
v = list(&Stack[bp+i], s, 0);
Stack[bp+i] = v;
if(s > 1){
Stack[bp+i+1] = Stack[bp+nargs+0];
Stack[bp+i+2] = Stack[bp+nargs+1];
Stack[bp+i+3] = i+1;
//Stack[bp+i+4] = 0;
Stack[bp+i+5] = 0;
SP = bp+i+6;
curr_frame = SP;
}
}else if(s < 0){
lerrorf(ArgError, "too few arguments");
}else{
PUSH(0);
Stack[SP-3] = i+1;
Stack[SP-4] = Stack[SP-5];
Stack[SP-5] = Stack[SP-6];
Stack[SP-6] = NIL;
curr_frame = SP;
}
nargs = i+1;
NEXT_OP;
OP(OP_TRYCATCH)
v = do_trycatch();
POPN(1);
Stack[SP-1] = v;
NEXT_OP;
OP(OP_OPTARGS)
i = GET_INT32(ip);
ip += 4;
n = GET_INT32(ip);
ip += 4;
if(nargs < i)
lerrorf(ArgError, "too few arguments");
if((int32_t)n > 0){
if(nargs > n)
lerrorf(ArgError, "too many arguments");
}else
n = -n;
if(n > nargs){
n -= nargs;
SP += n;
Stack[SP-1] = Stack[SP-n-1];
Stack[SP-2] = Stack[SP-n-2];
Stack[SP-3] = nargs+n;
Stack[SP-4] = Stack[SP-n-4];
Stack[SP-5] = Stack[SP-n-5];
curr_frame = SP;
for(i = 0; i < n; i++)
Stack[bp+nargs+i] = UNBOUND;
nargs += n;
}
NEXT_OP;
OP(OP_BRBOUND)
i = GET_INT32(ip);
ip += 4;
v = captured ? vector_elt(Stack[bp], i) : Stack[bp+i];
PUSH(v != UNBOUND ? FL_T : FL_F);
NEXT_OP;
OP(OP_KEYARGS)
v = fn_vals(Stack[bp-1]);
v = vector_elt(v, 0);
i = GET_INT32(ip);
ip += 4;
n = GET_INT32(ip);
ip += 4;
s = GET_INT32(ip);
ip += 4;
nargs = process_keys(v, i, n, labs(s)-(i+n), bp, nargs, s<0);
NEXT_OP;
}
op = *ip++;
}
}
#define SWAP_INT32(a)
#define SWAP_INT16(a)
#include "maxstack.inc"
#if BYTE_ORDER == BIG_ENDIAN
#undef SWAP_INT32
#undef SWAP_INT16
#if defined(__sparc__)
#define SWAP_INT32(a) \
do{ \
uint8_t *x = (void*)a, y; \
y = x[0]; x[0] = x[3]; x[3] = y; \
y = x[1]; x[1] = x[2]; x[2] = y; \
}while(0)
#define SWAP_INT16(a) \
do{ \
uint8_t *x = (void*)a, y; \
y = x[0]; x[0] = x[1]; x[1] = y; \
}while(0)
#else
#define SWAP_INT32(a) (*(int32_t*)(a) = bswap_32(*(int32_t*)(a)))
#define SWAP_INT16(a) (*(int16_t*)(a) = bswap_16(*(int16_t*)(a)))
#endif
#define compute_maxstack compute_maxstack_swap
#include "maxstack.inc"
#undef compute_maxstack
#else
#endif
// top = top frame pointer to start at
static value_t
_stacktrace(uint32_t top)
{
uint32_t bp, sz;
value_t v, lst = NIL;
fl_gc_handle(&lst);
while(top > 0){
sz = Stack[top-3]+1;
bp = top-5-sz;
v = alloc_vector(sz, 0);
if(Stack[top-1] /*captured*/){
vector_elt(v, 0) = Stack[bp];
memmove(&vector_elt(v, 1),
&vector_elt(Stack[bp+1], 0), (sz-1)*sizeof(value_t));
}else{
uint32_t i;
for(i = 0; i < sz; i++){
value_t si = Stack[bp+i];
// if there's an error evaluating argument defaults some slots
// might be left set to UNBOUND (issue #22)
vector_elt(v, i) = si == UNBOUND ? FL_UNSPECIFIED : si;
}
}
lst = fl_cons(v, lst);
top = Stack[top-4];
}
fl_free_gc_handles(1);
return lst;
}
// builtins -------------------------------------------------------------------
BUILTIN("gc", gc)
{
USED(args);
argcount(nargs, 0);
gc(0);
return FL_T;
}
BUILTIN("function", function)
{
if(nargs == 1 && issymbol(args[0]))
return fn_builtin_builtin(args, nargs);
if(nargs < 2 || nargs > 4)
argcount(nargs, 2);
if(!fl_isstring(args[0]))
type_error("string", args[0]);
if(!isvector(args[1]))
type_error("vector", args[1]);
cvalue_t *arr = (cvalue_t*)ptr(args[0]);
cv_pin(arr);
char *data = cv_data(arr);
uint32_t ms;
if((uint8_t)data[4] >= N_OPCODES){
// read syntax, shifted 48 for compact text representation
size_t i, sz = cv_len(arr);
for(i = 0; i < sz; i++)
data[i] -= 48;
#if BYTE_ORDER == BIG_ENDIAN
ms = compute_maxstack((uint8_t*)data, cv_len(arr));
}else{
ms = compute_maxstack_swap((uint8_t*)data, cv_len(arr));
}
#else
}
ms = compute_maxstack((uint8_t*)data, cv_len(arr));
#endif
PUT_INT32(data, ms);
function_t *fn = alloc_words(4);
value_t fv = tagptr(fn, TAG_FUNCTION);
fn->bcode = args[0];
fn->vals = args[1];
fn->env = NIL;
fn->name = LAMBDA;
if(nargs > 2){
if(issymbol(args[2])){
fn->name = args[2];
if(nargs > 3)
fn->env = args[3];
}else{
fn->env = args[2];
if(nargs > 3){
if(!issymbol(args[3]))
type_error("symbol", args[3]);
fn->name = args[3];
}
}
if(isgensym(fn->name))
lerrorf(ArgError, "name should not be a gensym");
}
return fv;
}
BUILTIN("function:code", function_code)
{
argcount(nargs, 1);
value_t v = args[0];
if(!isclosure(v))
type_error("function", v);
return fn_bcode(v);
}
BUILTIN("function:vals", function_vals)
{
argcount(nargs, 1);
value_t v = args[0];
if(!isclosure(v))
type_error("function", v);
return fn_vals(v);
}
BUILTIN("function:env", function_env)
{
argcount(nargs, 1);
value_t v = args[0];
if(!isclosure(v))
type_error("function", v);
return fn_env(v);
}
BUILTIN("function:name", function_name)
{
argcount(nargs, 1);
value_t v = args[0];
if(!isclosure(v))
type_error("function", v);
return fn_name(v);
}
BUILTIN("copy-list", copy_list)
{
argcount(nargs, 1);
return copy_list(args[0]);
}
BUILTIN("append", append)
{
value_t first = NIL, lst, lastcons = NIL;
int i;
if(nargs == 0)
return NIL;
fl_gc_handle(&first);
fl_gc_handle(&lastcons);
for(i = 0; i < nargs; i++){
lst = args[i];
if(iscons(lst)){
lst = copy_list(lst);
if(first == NIL)
first = lst;
else
cdr_(lastcons) = lst;
lastcons = tagptr((((cons_t*)curheap)-1), TAG_CONS);
}else if(lst != NIL){
type_error("cons", lst);
}
}
fl_free_gc_handles(2);
return first;
}
BUILTIN("list*", liststar)
{
if(nargs == 1)
return args[0];
if(nargs == 0)
argcount(nargs, 1);
return list(args, nargs, 1);
}
BUILTIN("stacktrace", stacktrace)
{
USED(args);
argcount(nargs, 0);
return _stacktrace(fl_throwing_frame ? fl_throwing_frame : curr_frame);
}
BUILTIN("map", map)
{
if(nargs < 2)
lerrorf(ArgError, "too few arguments");
if(!iscons(args[1]))
return NIL;
value_t first, last, v;
int64_t argSP = args-Stack;
assert(argSP >= 0 && argSP < N_STACK);
if(nargs == 2){
if(SP+3 > N_STACK)
grow_stack();
PUSH(Stack[argSP]);
PUSH(car_(Stack[argSP+1]));
v = _applyn(1);
PUSH(v);
v = mk_cons();
car_(v) = POP(); cdr_(v) = NIL;
last = first = v;
Stack[argSP+1] = cdr_(Stack[argSP+1]);
fl_gc_handle(&first);
fl_gc_handle(&last);
while(iscons(Stack[argSP+1])){
Stack[SP-2] = Stack[argSP];
Stack[SP-1] = car_(Stack[argSP+1]);
v = _applyn(1);
PUSH(v);
v = mk_cons();
car_(v) = POP(); cdr_(v) = NIL;
cdr_(last) = v;
last = v;
Stack[argSP+1] = cdr_(Stack[argSP+1]);
}
POPN(2);
fl_free_gc_handles(2);
}else{
int i;
while(SP+nargs+1 > N_STACK)
grow_stack();
PUSH(Stack[argSP]);
for(i = 1; i < nargs; i++){
PUSH(car(Stack[argSP+i]));
Stack[argSP+i] = cdr_(Stack[argSP+i]);
}
v = _applyn(nargs-1);
POPN(nargs);
PUSH(v);
v = mk_cons();
car_(v) = POP(); cdr_(v) = NIL;
last = first = v;
fl_gc_handle(&first);
fl_gc_handle(&last);
while(iscons(Stack[argSP+1])){
PUSH(Stack[argSP]);
for(i = 1; i < nargs; i++){
PUSH(car(Stack[argSP+i]));
Stack[argSP+i] = cdr_(Stack[argSP+i]);
}
v = _applyn(nargs-1);
POPN(nargs);
PUSH(v);
v = mk_cons();
car_(v) = POP(); cdr_(v) = NIL;
cdr_(last) = v;
last = v;
}
fl_free_gc_handles(2);
}
return first;
}
static const builtinspec_t builtin_fns[] = {
#define BUILTIN_FN(l, c){l, fn_builtin_##c},
#include "builtin_fns.h"
#undef BUILTIN_FN
};
// initialization -------------------------------------------------------------
void
fl_init(size_t initial_heapsize)
{
int i;
heapsize = initial_heapsize;
fromspace = LLT_ALLOC(heapsize);
tospace = LLT_ALLOC(heapsize);
curheap = fromspace;
lim = curheap+heapsize-sizeof(cons_t);
consflags = bitvector_new(heapsize/sizeof(cons_t), 1);
htable_new(&printconses, 32);
comparehash_init();
N_STACK = 262144;
Stack = LLT_ALLOC(N_STACK*sizeof(value_t));
FL_NIL = NIL = builtin(OP_THE_EMPTY_LIST);
FL_T = builtin(OP_BOOL_CONST_T);
FL_F = builtin(OP_BOOL_CONST_F);
FL_EOF = builtin(OP_EOF_OBJECT);
LAMBDA = symbol("lambda");
FUNCTION = symbol("function");
QUOTE = symbol("quote");
TRYCATCH = symbol("trycatch");
BACKQUOTE = symbol("quasiquote");
COMMA = symbol("unquote");
COMMAAT = symbol("unquote-splicing");
COMMADOT = symbol("unquote-nsplicing");
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");
pairsym = symbol("pair");
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");
setqsym = symbol("set!");
evalsym = symbol("eval");
vu8sym = symbol("vu8");
fnsym = symbol("fn");
nulsym = symbol("nul");
alarmsym = symbol("alarm");
backspacesym = symbol("backspace");
tabsym = symbol("tab");
linefeedsym = symbol("linefeed");
vtabsym = symbol("vtab");
pagesym = symbol("page");
returnsym = symbol("return");
escsym = symbol("esc");
spacesym = symbol("space");
deletesym = symbol("delete");
newlinesym = symbol("newline");
tsym = symbol("t");
Tsym = symbol("T");
fsym = symbol("f");
Fsym = symbol("F");
builtins_table_sym = symbol("*builtins*");
set(printprettysym = symbol("*print-pretty*"), FL_T);
set(printreadablysym = symbol("*print-readably*"), FL_T);
set(printwidthsym = symbol("*print-width*"), fixnum(SCR_WIDTH));
set(printlengthsym = symbol("*print-length*"), FL_F);
set(printlevelsym = symbol("*print-level*"), FL_F);
fl_lasterror = NIL;
for(i = 0; i < nelem(builtins); i++){
if(builtins[i].name)
setc(symbol(builtins[i].name), builtin(i));
}
setc(symbol("eq"), builtin(OP_EQ));
setc(symbol("procedure?"), builtin(OP_FUNCTIONP));
setc(symbol("top-level-bound?"), builtin(OP_BOUNDP));
#if defined(__linux__)
set(symbol("*os-name*"), symbol("linux"));
#elif defined(__OpenBSD__)
set(symbol("*os-name*"), symbol("openbsd"));
#elif defined(__FreeBSD__)
set(symbol("*os-name*"), symbol("freebsd"));
#elif defined(__NetBSD__)
set(symbol("*os-name*"), symbol("netbsd"));
#elif defined(__DragonFly__)
set(symbol("*os-name*"), symbol("dragonflybsd"));
#elif defined(__plan9__)
set(symbol("*os-name*"), symbol("plan9"));
#else
set(symbol("*os-name*"), symbol("unknown"));
#endif
the_empty_vector = tagptr(alloc_words(1), TAG_VECTOR);
vector_setsize(the_empty_vector, 0);
cvalues_init();
memory_exception_value = fl_list2(MemoryError, cvalue_static_cstring("out of memory"));
const builtinspec_t *b;
for(i = 0, b = builtin_fns; i < nelem(builtin_fns); i++, b++)
setc(symbol(b->name), cbuiltin(b->name, b->fptr));
table_init();
iostream_init();
}
// top level ------------------------------------------------------------------
value_t
fl_toplevel_eval(value_t expr)
{
return fl_applyn(1, symbol_value(evalsym), expr);
}
int
fl_load_system_image(value_t sys_image_iostream)
{
value_t e;
int saveSP;
symbol_t *sym;
PUSH(sys_image_iostream);
saveSP = SP;
FL_TRY{
curr_fname = "bootstrap";
while(1){
e = fl_read_sexpr(Stack[SP-1]);
if(ios_eof(value2c(ios_t*, Stack[SP-1])))
break;
if(isfunction(e)){
// stage 0 format: series of thunks
PUSH(e);
(void)_applyn(0);
SP = saveSP;
}else{
// stage 1 format: list alternating symbol/value
while(iscons(e)){
sym = tosymbol(car_(e));
e = cdr_(e);
(void)tocons(e);
sym->binding = car_(e);
e = cdr_(e);
}
break;
}
}
}
FL_CATCH_NO_INC{
ios_puts("fatal error during bootstrap:\n", ios_stderr);
fl_print(ios_stderr, fl_lasterror);
ios_putc('\n', ios_stderr);
return 1;
}
ios_close(value2c(ios_t*, Stack[SP-1]));
POPN(1);
return 0;
}