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reference.c
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C/C++ Source or Header
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1987-06-04
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4KB
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183 lines
/*
(c) Copyright Taiichi Yuasa and Masami Hagiya, 1984. All rights reserved.
Copying of this file is authorized to users who have executed the true and
proper "License Agreement for Kyoto Common LISP" with SIGLISP.
*/
/*
reference.c
Reference in Constants and Variables
*/
#include "include.h"
Lfboundp()
{
object sym;
check_arg(1);
sym = vs_base[0];
if (type_of(sym) != t_symbol)
not_a_symbol(sym);
if (sym->s.s_sfdef != NOT_SPECIAL)
vs_base[0] = Ct;
else if (sym->s.s_gfdef == OBJNULL)
vs_base[0]= Cnil;
else
vs_base[0]= Ct;
}
object
symbol_function(sym)
object sym;
{
/*
if (type_of(sym) != t_symbol)
not_a_symbol(sym);
*/
if (sym->s.s_sfdef != NOT_SPECIAL || sym->s.s_mflag)
FEinvalid_function(sym);
if (sym->s.s_gfdef == OBJNULL)
FEundefined_function(sym);
return(sym->s.s_gfdef);
}
/*
Symbol-function returns
function-closure for function
(macro . function-closure) for macros
(special . address) for special forms.
*/
Lsymbol_function()
{
object sym;
check_arg(1);
sym = vs_base[0];
if (type_of(sym) != t_symbol)
not_a_symbol(sym);
if (sym->s.s_sfdef != NOT_SPECIAL) {
vs_push(make_fixnum((int)(sym->s.s_sfdef)));
vs_base[0] = Sspecial;
stack_cons();
return;
}
if (sym->s.s_gfdef==OBJNULL)
FEundefined_function(sym);
if (sym->s.s_mflag) {
vs_push(sym->s.s_gfdef);
vs_base[0] = Smacro;
stack_cons();
return;
}
vs_base[0] = sym->s.s_gfdef;
}
Fquote(form)
object form;
{
if (endp(form))
FEtoo_few_argumentsF(form);
if (!endp(MMcdr(form)))
FEtoo_many_argumentsF(form);
vs_base = vs_top;
vs_push(MMcar(form));
}
Ffunction(form)
object form;
{
object fun;
object fd;
if (endp(form))
FEtoo_few_argumentsF(form);
if (!endp(MMcdr(form)))
FEtoo_many_argumentsF(form);
fun = MMcar(form);
if (type_of(fun) == t_symbol) {
fd = lex_fd_sch(fun);
if (MMnull(fd) || MMcadr(fd) != Sfunction)
if (fun->s.s_gfdef == OBJNULL || fun->s.s_mflag)
FEundefined_function(fun);
else {
vs_base = vs_top;
vs_push(fun->s.s_gfdef);
}
else {
vs_base = vs_top;
vs_push(MMcaddr(fd));
}
} else if (type_of(fun) == t_cons && MMcar(fun) == Slambda) {
vs_base = vs_top;
vs_push(MMcdr(fun));
vs_base[0] = MMcons(lex_env[2], vs_base[0]);
vs_base[0] = MMcons(lex_env[1], vs_base[0]);
vs_base[0] = MMcons(lex_env[0], vs_base[0]);
vs_base[0] = MMcons(Slambda_closure, vs_base[0]);
} else
FEinvalid_function(fun);
}
Lsymbol_value()
{
object sym;
check_arg(1);
sym = vs_base[0];
if (type_of(sym) != t_symbol)
not_a_symbol(sym);
if (sym->s.s_dbind == OBJNULL)
FEunbound_variable(sym);
else
vs_base[0] = sym->s.s_dbind;
}
Lboundp()
{
object sym;
check_arg(1);
sym=vs_base[0];
if (type_of(sym) != t_symbol)
not_a_symbol(sym);
if (sym->s.s_dbind == OBJNULL)
vs_base[0] = Cnil;
else
vs_base[0] = Ct;
}
Lmacro_function()
{
check_arg(1);
if (type_of(vs_base[0]) != t_symbol)
not_a_symbol(vs_base[0]);
if (vs_base[0]->s.s_gfdef != OBJNULL && vs_base[0]->s.s_mflag)
vs_base[0] = vs_base[0]->s.s_gfdef;
else
vs_base[0] = Cnil;
}
Lspecial_form_p()
{
check_arg(1);
if (type_of(vs_base[0]) != t_symbol)
not_a_symbol(vs_base[0]);
if (vs_base[0]->s.s_sfdef != NOT_SPECIAL)
vs_base[0] = Ct;
else
vs_base[0] = Cnil;
}
init_reference()
{
make_function("SYMBOL-FUNCTION", Lsymbol_function);
make_function("FBOUNDP", Lfboundp);
make_special_form("QUOTE", Fquote);
Sfunction = make_special_form("FUNCTION", Ffunction);
make_function("SYMBOL-VALUE", Lsymbol_value);
make_function("BOUNDP", Lboundp);
make_function("MACRO-FUNCTION", Lmacro_function);
make_function("SPECIAL-FORM-P", Lspecial_form_p);
}