/* 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "llt.h" #include "flisp.h" #include "opcodes.h" 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 NIL, FL_T, FL_F, LAMBDA, QUOTE, IF, TRYCATCH; value_t BACKQUOTE, COMMA, COMMAAT, COMMADOT, FUNCTION; value_t IOError, ParseError, TypeError, ArgError, UnboundError, MemoryError; value_t DivideError, BoundsError, Error, KeyError, EnumerationError; value_t pairsym, symbolsym, fixnumsym, vectorsym, builtinsym, vu8sym; value_t definesym, defmacrosym, forsym, labelsym, printprettysym, setqsym; value_t printwidthsym, printreadablysym; value_t tsym, Tsym, fsym, Fsym, booleansym, nullsym, evalsym; static value_t apply_cl(uint32_t nargs); 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; uint32_t frame; uint32_t ngchnd; readstate_t *rdst; struct _ectx_t *prev; } exception_context_t; static exception_context_t *ctx = NULL; static value_t lasterror; static uint32_t throwing_frame=0; // active frame when exception was thrown #define FL_TRY \ exception_context_t _ctx; int l__tr, l__ca; \ _ctx.sp=SP; _ctx.frame=curr_frame; _ctx.rdst=readstate; _ctx.prev=ctx; \ _ctx.ngchnd = N_GCHND; 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, throwing_frame=0, SP=_ctx.sp, curr_frame=_ctx.frame) void raise(value_t e) { lasterror = e; // unwind read state while (readstate != ctx->rdst) { free_readstate(readstate); readstate = readstate->prev; } if (throwing_frame == 0) throwing_frame = curr_frame; N_GCHND = ctx->ngchnd; 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 (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->isconst = 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 isconst; 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 fl_gensym(value_t *args, uint32_t nargs) { 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); } 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) 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) = 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 ------------------------------------------------------------------ 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(int 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; } *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, 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); 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) { static int grew = 0; void *temp; uint32_t i, f, top; readstate_t *rs; curheap = tospace; lim = curheap+heapsize-sizeof(cons_t); if (throwing_frame > curr_frame) { top = throwing_frame - 4; f = Stack[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; } lasterror = relocate(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 = 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 ---------------------------------------------------------------------- // apply function with n args on the stack static value_t _applyn(uint32_t n) { assert(n <= MAX_ARGS+1); 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 { type_error("apply", "function", f); } SP = saveSP; return v; } value_t apply(value_t f, value_t l) { value_t v = l; uint32_t n = SP; PUSH(f); while (iscons(v)) { if ((SP-n-1) == MAX_ARGS) { PUSH(v); break; } PUSH(car_(v)); v = cdr_(v); } n = SP - n - 1; v = _applyn(n); POPN(n+1); return v; } value_t applyn(uint32_t n, value_t f, ...) { assert(n <= MAX_ARGS); va_list ap; va_start(ap, f); size_t i; PUSH(f); for(i=0; i < n; i++) { value_t a = va_arg(ap, value_t); PUSH(a); } value_t v = _applyn(n); POPN(n+1); return v; } 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; } int isnumber(value_t v) { return (isfixnum(v) || iscprim(v)); } // read ----------------------------------------------------------------------- #include "read.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; uint32_t i; value_t v; 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 || nargs > MAX_ARGS) (c-2)->cdr = (c-1)->car; else (c-1)->cdr = NIL; return v; } #define FL_COPYLIST(l) apply_liststar((l),0) // perform (apply list* L) // like the function list() above, but takes arguments from a list // rather than from an array (the stack) // if !star, then it performs copy-list static value_t apply_liststar(value_t L, int star) { PUSH(NIL); PUSH(NIL); PUSH(L); value_t *pfirst = &Stack[SP-3]; value_t *plcons = &Stack[SP-2]; value_t *pL = &Stack[SP-1]; value_t c; while (iscons(*pL)) { if (!star || iscons(cdr_(*pL))) { c = mk_cons(); car_(c) = car_(*pL); cdr_(c) = NIL; } else { // last element; becomes final CDR c = car_(*pL); } if (*pfirst == NIL) *pfirst = c; else cdr_(*plcons) = c; *plcons = c; *pL = cdr_(*pL); } POPN(2); return POP(); } static value_t do_trycatch() { 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(lasterror); v = apply_cl(1); } SP = saveSP; return v; } #define fn_bcode(f) (((value_t*)ptr(f))[0]) #define fn_vals(f) (((value_t*)ptr(f))[1]) #define fn_env(f) (((value_t*)ptr(f))[2]) #if _BYTE_ORDER == __BIG_ENDIAN #define GET_INT32(a) \ ((((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)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 #ifdef USE_COMPUTED_GOTO #define OP(x) L_##x: #define NEXT_OP goto *vm_labels[*ip++] #define DISPATCH goto *vm_labels[op] #else #define OP(x) case x: #define NEXT_OP goto next_op #define DISPATCH goto dispatch #endif static void grow_stack() { size_t newsz = N_STACK + (N_STACK>>1); value_t *ns = realloc(Stack, newsz*sizeof(value_t)); if (ns == NULL) lerror(MemoryError, "stack overflow"); Stack = ns; N_STACK = newsz; } /* stack on entry: MAX_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) { VM_LABELS; uint32_t top_frame = curr_frame; // frame variables uint32_t n, captured; uint32_t bp; const uint8_t *ip; fixnum_t s, hi; // temporary variables (not necessary to preserve across calls) uint32_t op; uint32_t i; symbol_t *sym; static cons_t *c; static value_t *pv; static int64_t accum; static value_t func, v, e; apply_cl_top: captured = 0; func = Stack[SP-nargs-1]; ip = cv_data((cvalue_t*)ptr(fn_bcode(func))); assert(!ismanaged((uptrint_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; { #ifdef USE_COMPUTED_GOTO { NEXT_OP; #else next_op: op = *ip++; dispatch: switch (op) { #endif OP(OP_ARGC) n = *ip++; if (nargs != n) { if (nargs > n) lerror(ArgError, "apply: too many arguments"); else lerror(ArgError, "apply: too few arguments"); } NEXT_OP; OP(OP_VARGC) i = *ip++; s = (fixnum_t)nargs - (fixnum_t)i; if (s > 0) { v = list(&Stack[bp+i], s); if (nargs > MAX_ARGS) { if (s == 1) { v = car_(v); } else { c = (cons_t*)curheap; (c-2)->cdr = (c-1)->car; } } 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) { lerror(ArgError, "apply: 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_LARGC) OP(OP_LVARGC) // move extra arguments from list to stack i = GET_INT32(ip); ip+=4; e = Stack[curr_frame-5]; // cloenv n = Stack[curr_frame-4]; // prev curr_frame POPN(5); if (nargs > MAX_ARGS) { v = POP(); // list of rest args nargs--; } else v = NIL; while (nargs < i) { if (!iscons(v)) lerror(ArgError, "apply: too few arguments"); PUSH(car_(v)); nargs++; v = cdr_(v); } if (ip[-5] == OP_LVARGC) { PUSH(v); nargs++; } else { if (iscons(v)) lerror(ArgError, "apply: too many arguments"); } PUSH(e); PUSH(n); PUSH(nargs); SP++;//PUSH(0); PUSH(0); curr_frame = SP; NEXT_OP; OP(OP_LET) // last arg is closure environment to use nargs--; Stack[SP-5] = Stack[SP-4]; Stack[SP-4] = nargs; POPN(1); Stack[SP-1] = 0; curr_frame = SP; NEXT_OP; OP(OP_NOP) NEXT_OP; OP(OP_DUP) SP++; Stack[SP-1] = Stack[SP-2]; NEXT_OP; OP(OP_POP) POPN(1); NEXT_OP; OP(OP_TCALL) n = *ip++; // nargs do_tcall: if (isfunction(Stack[SP-n-1])) { curr_frame = Stack[curr_frame-4]; for(s=-1; s < (fixnum_t)n; s++) Stack[bp+s] = Stack[SP-n+s]; SP = bp+n; nargs = n; goto apply_cl_top; } goto do_call; OP(OP_CALL) n = *ip++; // nargs do_call: func = Stack[SP-n-1]; s = SP; if (tag(func) == TAG_FUNCTION) { if (func > (N_BUILTINS<<3)) { Stack[curr_frame-2] = (uptrint_t)ip; nargs = n; goto apply_cl_top; } else { i = uintval(func); if (i > OP_ASET) type_error("apply", "function", func); op = (uint8_t)i; s = builtin_arg_counts[op]; if (s >= 0) argcount(builtin_names[op], n, s); else if (s != ANYARGS && (signed)n < -s) argcount(builtin_names[op], n, -s); // remove function arg for(s=SP-n-1; s < (int)SP-1; s++) Stack[s] = Stack[s+1]; SP--; switch (op) { 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: DISPATCH; } } } else if (iscbuiltin(func)) { v = (((builtin_t*)ptr(func))[3])(&Stack[SP-n], n); } else { type_error("apply", "function", func); } SP = s-n; Stack[SP-1] = v; NEXT_OP; OP(OP_JMP) ip += (ptrint_t)GET_INT16(ip); NEXT_OP; OP(OP_BRF) v = POP(); if (v == FL_F) ip += (ptrint_t)GET_INT16(ip); else ip += 2; NEXT_OP; OP(OP_BRT) v = POP(); if (v != FL_F) ip += (ptrint_t)GET_INT16(ip); else ip += 2; NEXT_OP; OP(OP_JMPL) ip += (ptrint_t)GET_INT32(ip); NEXT_OP; OP(OP_BRFL) v = POP(); if (v == FL_F) ip += (ptrint_t)GET_INT32(ip); else ip += 4; NEXT_OP; OP(OP_BRTL) v = POP(); if (v != FL_F) ip += (ptrint_t)GET_INT32(ip); else ip += 4; 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_EQ) Stack[SP-2] = ((Stack[SP-2] == Stack[SP-1]) ? FL_T : FL_F); POPN(1); 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 = equal(Stack[SP-2], Stack[SP-1]); } Stack[SP-2] = v; POPN(1); NEXT_OP; OP(OP_EQUAL) if (Stack[SP-2] == Stack[SP-1]) { v = FL_T; } else { v = equal(Stack[SP-2], Stack[SP-1]); } Stack[SP-2] = v; POPN(1); NEXT_OP; OP(OP_PAIRP) Stack[SP-1] = (iscons(Stack[SP-1]) ? FL_T : FL_F); NEXT_OP; OP(OP_ATOMP) Stack[SP-1] = (iscons(Stack[SP-1]) ? FL_F : FL_T); NEXT_OP; OP(OP_NOT) Stack[SP-1] = ((Stack[SP-1]==FL_F) ? FL_T : FL_F); 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_SYMBOLP) Stack[SP-1] = (issymbol(Stack[SP-1]) ? FL_T : FL_F); NEXT_OP; OP(OP_NUMBERP) v = Stack[SP-1]; Stack[SP-1] = (isfixnum(v) || iscprim(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], "bound?"); 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 &&v!=FL_F&&v!=FL_T&&v!=NIL) || 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_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_CAR) v = Stack[SP-1]; if (!iscons(v)) type_error("car", "cons", v); Stack[SP-1] = car_(v); NEXT_OP; OP(OP_CDR) v = Stack[SP-1]; if (!iscons(v)) type_error("cdr", "cons", v); Stack[SP-1] = cdr_(v); NEXT_OP; OP(OP_SETCAR) car(Stack[SP-2]) = Stack[SP-1]; POPN(1); NEXT_OP; OP(OP_SETCDR) cdr(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); POPN(n); PUSH(v); } else { PUSH(NIL); } NEXT_OP; OP(OP_TAPPLY) OP(OP_APPLY) #ifdef USE_COMPUTED_GOTO op = ip[-1]; #endif n = *ip++; apply_apply: v = POP(); // arglist if (n > MAX_ARGS) { v = apply_liststar(v, 1); } n = SP-(n-2); // n-2 == # leading arguments not in the list while (iscons(v)) { if (SP-n == MAX_ARGS) { PUSH(v); break; } PUSH(car_(v)); v = cdr_(v); } n = SP-n; if (op==OP_TAPPLY) goto do_tcall; else goto do_call; OP(OP_ADD) n = *ip++; apply_add: s = 0; i = SP-n; if (n > MAX_ARGS) goto add_ovf; 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_ADD2) if (bothfixnums(Stack[SP-1], Stack[SP-2])) { s = numval(Stack[SP-1]) + numval(Stack[SP-2]); if (fits_fixnum(s)) v = fixnum(s); else v = mk_long(s); } else { v = fl_add_any(&Stack[SP-2], 2, 0); } POPN(1); Stack[SP-1] = 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_NEG) do_neg: if (isfixnum(Stack[SP-1])) Stack[SP-1] = fixnum(-numval(Stack[SP-1])); else Stack[SP-1] = fl_neg(Stack[SP-1]); NEXT_OP; OP(OP_SUB2) do_sub2: if (bothfixnums(Stack[SP-2], Stack[SP-1])) { s = numval(Stack[SP-2]) - numval(Stack[SP-1]); if (fits_fixnum(s)) v = fixnum(s); else v = mk_long(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; i = SP-n; if (n > MAX_ARGS) goto mul_ovf; for (; i < SP; i++) { if (isfixnum(Stack[i])) { accum *= numval(Stack[i]); } else { mul_ovf: v = fl_mul_any(&Stack[i], SP-i, accum); break; } } if (i == SP) { if (fits_fixnum(accum)) v = fixnum(accum); else v = 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,"=")) ? FL_T : FL_F; POPN(1); Stack[SP-1] = v; 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(compare(Stack[SP-2], Stack[SP-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]); POPN(1); NEXT_OP; OP(OP_VECTOR) n = *ip++; apply_vector: if (n > MAX_ARGS) { i = llength(Stack[SP-1])-1; } else i = 0; v = alloc_vector(n+i, 0); if (n) { memcpy(&vector_elt(v,0), &Stack[SP-n], n*sizeof(value_t)); e = POP(); POPN(n-1); } if (n > MAX_ARGS) { i = n-1; while (iscons(e)) { vector_elt(v,i) = car_(e); i++; e = cdr_(e); } } PUSH(v); NEXT_OP; OP(OP_AREF) v = Stack[SP-2]; if (isvector(v)) { i = tofixnum(Stack[SP-1], "aref"); if ((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 { type_error("aref", "sequence", v); } POPN(1); Stack[SP-1] = v; NEXT_OP; OP(OP_ASET) e = Stack[SP-3]; if (isvector(e)) { i = tofixnum(Stack[SP-2], "aset!"); if ((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); } POPN(2); Stack[SP-1] = v; NEXT_OP; OP(OP_FOR) s = tofixnum(Stack[SP-3], "for"); hi = tofixnum(Stack[SP-2], "for"); //f = Stack[SP-1]; v = FL_F; 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_LOADT) PUSH(FL_T); NEXT_OP; OP(OP_LOADF) PUSH(FL_F); NEXT_OP; OP(OP_LOADNIL) PUSH(NIL); NEXT_OP; OP(OP_LOAD0) PUSH(fixnum(0)); NEXT_OP; OP(OP_LOAD1) PUSH(fixnum(1)); NEXT_OP; OP(OP_LOADI8) s = (int8_t)*ip++; PUSH(fixnum(s)); NEXT_OP; OP(OP_LOADV) v = fn_vals(Stack[bp-1]); assert(*ip < vector_size(v)); v = vector_elt(v, *ip); ip++; PUSH(v); 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_LOADGL) v = fn_vals(Stack[bp-1]); v = vector_elt(v, GET_INT32(ip)); ip+=4; goto do_loadg; OP(OP_LOADG) v = fn_vals(Stack[bp-1]); assert(*ip < vector_size(v)); v = vector_elt(v, *ip); ip++; do_loadg: assert(issymbol(v)); sym = (symbol_t*)ptr(v); if (sym->binding == UNBOUND) raise(list2(UnboundError, v)); PUSH(sym->binding); NEXT_OP; OP(OP_SETGL) v = fn_vals(Stack[bp-1]); v = vector_elt(v, GET_INT32(ip)); ip+=4; goto do_setg; OP(OP_SETG) v = fn_vals(Stack[bp-1]); assert(*ip < vector_size(v)); v = vector_elt(v, *ip); ip++; do_setg: assert(issymbol(v)); sym = (symbol_t*)ptr(v); v = Stack[SP-1]; if (!sym->isconst) sym->binding = v; 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_LOADA0) if (captured) v = vector_elt(Stack[bp], 0); else v = Stack[bp]; PUSH(v); NEXT_OP; OP(OP_LOADA1) if (captured) v = vector_elt(Stack[bp], 1); else v = Stack[bp+1]; PUSH(v); NEXT_OP; OP(OP_LOADAL) assert(nargs > 0); i = GET_INT32(ip); ip+=4; if (captured) v = vector_elt(Stack[bp], i); else v = Stack[bp+i]; PUSH(v); 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_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_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_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_LOADC00) PUSH(vector_elt(Stack[bp+nargs], 0)); NEXT_OP; OP(OP_LOADC01) PUSH(vector_elt(Stack[bp+nargs], 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); vector_elt(v, i) = Stack[SP-1]; NEXT_OP; OP(OP_CLOSURE) OP(OP_COPYENV) // 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 (ip[-1] == OP_CLOSURE) { pv = alloc_words(4); 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 POPN(1); Stack[SP-1] = tagptr(pv, TAG_FUNCTION); } NEXT_OP; OP(OP_TRYCATCH) v = do_trycatch(); POPN(1); Stack[SP-1] = v; NEXT_OP; #ifndef USE_COMPUTED_GOTO default: goto dispatch; #endif } } #ifdef USE_COMPUTED_GOTO return UNBOUND; // not reached #else goto dispatch; #endif } static uint32_t compute_maxstack(uint8_t *code, size_t len) { uint8_t *ip = code+4, *end = code+len; uint8_t op; uint32_t n, sp = 0, maxsp = 0; while (1) { if ((int32_t)sp > (int32_t)maxsp) maxsp = sp; if (ip >= end) break; op = *ip++; switch (op) { case OP_ARGC: n = *ip++; break; case OP_VARGC: n = *ip++; sp += (n+2); break; case OP_LARGC: n = GET_INT32(ip); ip+=4; sp += (n+2); break; case OP_LVARGC: // move extra arguments from list to stack n = GET_INT32(ip); ip+=4; sp += (n+3); break; case OP_LET: break; case OP_TCALL: case OP_CALL: n = *ip++; // nargs sp -= n; break; case OP_JMP: ip += 2; break; case OP_JMPL: ip += 4; break; case OP_BRF: case OP_BRT: ip+=2; sp--; break; case OP_BRFL: case OP_BRTL: ip += 4; sp--; break; case OP_RET: sp--; break; case OP_CONS: case OP_SETCAR: case OP_SETCDR: case OP_POP: case OP_EQ: case OP_EQV: case OP_EQUAL: case OP_ADD2: case OP_SUB2: case OP_IDIV: case OP_NUMEQ: case OP_LT: case OP_COMPARE: case OP_AREF: case OP_TRYCATCH: sp--; break; case OP_PAIRP: case OP_ATOMP: case OP_NOT: case OP_NULLP: case OP_BOOLEANP: case OP_SYMBOLP: case OP_NUMBERP: case OP_FIXNUMP: case OP_BOUNDP: case OP_BUILTINP: case OP_FUNCTIONP: case OP_VECTORP: case OP_NOP: case OP_CAR: case OP_CDR: case OP_NEG: case OP_CLOSURE: break; case OP_TAPPLY: case OP_APPLY: if (sp+MAX_ARGS+1 > maxsp) maxsp = sp+MAX_ARGS+1; n = *ip++; sp -= (n-1); break; case OP_LIST: case OP_ADD: case OP_SUB: case OP_MUL: case OP_DIV: case OP_VECTOR: n = *ip++; sp -= (n-1); break; case OP_ASET: sp -= 2; break; case OP_FOR: if (sp+2 > maxsp) maxsp = sp+2; sp -=2; break; case OP_LOADT: case OP_LOADF: case OP_LOADNIL: case OP_LOAD0: case OP_LOAD1: case OP_LOADA0: case OP_LOADA1: case OP_LOADC00: case OP_LOADC01: case OP_COPYENV: case OP_DUP: sp++; break; case OP_LOADI8: case OP_LOADV: case OP_LOADG: case OP_LOADA: ip++; sp++; break; case OP_LOADVL: case OP_LOADGL: case OP_LOADAL: ip+=4; sp++; break; case OP_SETG: case OP_SETA: ip++; break; case OP_SETGL: case OP_SETAL: ip+=4; break; case OP_LOADC: ip+=2; sp++; break; case OP_SETC: ip+=2; break; case OP_LOADCL: ip+=8; sp++; break; case OP_SETCL: ip+=8; break; } } return maxsp+5; } // 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]; memcpy(&vector_elt(v, 1), &vector_elt(Stack[bp+1],0), (sz-1)*sizeof(value_t)); } else { memcpy(&vector_elt(v,0), &Stack[bp], sz*sizeof(value_t)); } lst = fl_cons(v, lst); top = Stack[top-4]; } fl_free_gc_handles(1); return lst; } // builtins ------------------------------------------------------------------- void assign_global_builtins(builtinspec_t *b) { while (b->name != NULL) { set(symbol(b->name), cbuiltin(b->name, b->fptr)); b++; } } static value_t fl_function(value_t *args, uint32_t nargs) { if (nargs != 3) argcount("function", nargs, 2); if (!isstring(args[0])) type_error("function", "string", args[0]); if (!isvector(args[1])) type_error("function", "vector", args[1]); cvalue_t *arr = (cvalue_t*)ptr(args[0]); cv_pin(arr); char *data = cv_data(arr); if (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; } uint32_t ms = compute_maxstack((uint8_t*)data, cv_len(arr)); PUT_INT32(data, ms); function_t *fn = (function_t*)alloc_words(4); value_t fv = tagptr(fn, TAG_FUNCTION); fn->bcode = args[0]; fn->vals = args[1]; if (nargs == 3) fn->env = args[2]; else fn->env = NIL; return fv; } static value_t fl_function_code(value_t *args, uint32_t nargs) { argcount("function:code", nargs, 1); value_t v = args[0]; if (!isclosure(v)) type_error("function:code", "function", v); return fn_bcode(v); } static value_t fl_function_vals(value_t *args, uint32_t nargs) { argcount("function:vals", nargs, 1); value_t v = args[0]; if (!isclosure(v)) type_error("function:vals", "function", v); return fn_vals(v); } static value_t fl_function_env(value_t *args, uint32_t nargs) { argcount("function:env", nargs, 1); value_t v = args[0]; if (!isclosure(v)) type_error("function:env", "function", v); return fn_env(v); } value_t fl_copylist(value_t *args, u_int32_t nargs) { argcount("copy-list", nargs, 1); return FL_COPYLIST(args[0]); } value_t fl_append(value_t *args, u_int32_t nargs) { if (nargs == 0) return NIL; value_t first=NIL, lst, lastcons=NIL; fl_gc_handle(&first); fl_gc_handle(&lastcons); uint32_t i=0; while (1) { if (i >= MAX_ARGS) { lst = car_(args[MAX_ARGS]); args[MAX_ARGS] = cdr_(args[MAX_ARGS]); if (!iscons(args[MAX_ARGS])) break; } else { lst = args[i++]; if (i >= nargs) break; } if (iscons(lst)) { lst = FL_COPYLIST(lst); if (first == NIL) first = lst; else cdr_(lastcons) = lst; lastcons = tagptr((((cons_t*)curheap)-1), TAG_CONS); } else if (lst != NIL) { type_error("append", "cons", lst); } } if (first == NIL) first = lst; else cdr_(lastcons) = lst; fl_free_gc_handles(2); return first; } value_t fl_liststar(value_t *args, u_int32_t nargs) { if (nargs == 1) return args[0]; else if (nargs == 0) argcount("list*", nargs, 1); if (nargs > MAX_ARGS) { args[MAX_ARGS] = apply_liststar(args[MAX_ARGS], 1); return list(args, nargs); } return _list(args, nargs, 1); } value_t fl_stacktrace(value_t *args, u_int32_t nargs) { (void)args; argcount("stacktrace", nargs, 0); return _stacktrace(throwing_frame ? throwing_frame : curr_frame); } static builtinspec_t core_builtin_info[] = { { "function", fl_function }, { "function:code", fl_function_code }, { "function:vals", fl_function_vals }, { "function:env", fl_function_env }, { "stacktrace", fl_stacktrace }, { "gensym", fl_gensym }, { "hash", fl_hash }, { "copy-list", fl_copylist }, { "append", fl_append }, { "list*", fl_liststar }, { NULL, NULL } }; // initialization ------------------------------------------------------------- extern void builtins_init(); extern void comparehash_init(); static char *EXEDIR = NULL; 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(); N_STACK = 262144; Stack = malloc(N_STACK*sizeof(value_t)); NIL = builtin(OP_THE_EMPTY_LIST); FL_T = builtin(OP_BOOL_CONST_T); FL_F = builtin(OP_BOOL_CONST_F); LAMBDA = symbol("lambda"); FUNCTION = symbol("function"); 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"); 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"); labelsym = symbol("label"); setqsym = symbol("set!"); evalsym = symbol("eval"); vu8sym = symbol("vu8"); tsym = symbol("t"); Tsym = symbol("T"); fsym = symbol("f"); Fsym = symbol("F"); set(printprettysym=symbol("*print-pretty*"), FL_T); set(printreadablysym=symbol("*print-readably*"), FL_T); set(printwidthsym=symbol("*print-width*"), fixnum(SCR_WIDTH)); lasterror = NIL; i = 0; for (i=OP_EQ; i <= OP_ASET; i++) { setc(symbol(builtin_names[i]), builtin(i)); } setc(symbol("eq"), builtin(OP_EQ)); setc(symbol("procedure?"), builtin(OP_FUNCTIONP)); #ifdef LINUX setc(symbol("*os-name*"), symbol("linux")); #elif defined(WIN32) || defined(WIN64) setc(symbol("*os-name*"), symbol("win32")); #elif defined(MACOSX) setc(symbol("*os-name*"), symbol("macos")); #else setc(symbol("*os-name*"), symbol("unknown")); #endif the_empty_vector = tagptr(alloc_words(1), TAG_VECTOR); vector_setsize(the_empty_vector, 0); cvalues_init(); 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")); assign_global_builtins(core_builtin_info); builtins_init(); } // repl ----------------------------------------------------------------------- value_t toplevel_eval(value_t expr) { return applyn(1, symbol_value(evalsym), expr); } 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]); POPN(1); } 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; int saveSP; symbol_t *sym; 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, "flisp.boot"); 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); saveSP = SP; while (1) { e = 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: symbol/value pairs sym = tosymbol(e, "bootstrap"); v = read_sexpr(Stack[SP-1]); sym->binding = v; } } ios_close(value2c(ios_t*,Stack[SP-1])); POPN(1); PUSH(symbol_value(symbol("__start"))); PUSH(argv_list(argc, argv)); (void)_applyn(1); } FL_CATCH { ios_puts("fatal error during bootstrap:\n", ios_stderr); print(ios_stderr, lasterror); ios_putc('\n', ios_stderr); return 1; } return 0; }