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mes/src/eval-apply.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* GNU Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mes/lib.h"
#include "mes/mes.h"
#include <string.h>
SCM
assert_defined (SCM x, SCM e) /*:((internal)) */
{
if (e == cell_undefined)
return error (cell_symbol_unbound_variable, x);
return e;
}
SCM
check_formals (SCM f, SCM formals, SCM args) /*:((internal)) */
{
long flen;
if (TYPE (formals) == TNUMBER)
flen = VALUE (formals);
else
flen = length__ (formals);
long alen = length__ (args);
if (alen != flen && alen != -1 && flen != -1)
{
char *s = "apply: wrong number of arguments; expected: ";
eputs (s);
eputs (itoa (flen));
eputs (", got: ");
eputs (itoa (alen));
eputs ("\n");
write_error_ (f);
SCM e = MAKE_STRING0 (s);
return error (cell_symbol_wrong_number_of_args, cons (e, f));
}
return cell_unspecified;
}
SCM
check_apply (SCM f, SCM e) /*:((internal)) */
{
char *type = 0;
if (f == cell_f || f == cell_t)
type = "bool";
if (f == cell_nil)
type = "nil";
if (f == cell_unspecified)
type = "*unspecified*";
if (f == cell_undefined)
type = "*undefined*";
if (TYPE (f) == TCHAR)
type = "char";
if (TYPE (f) == TNUMBER)
type = "number";
if (TYPE (f) == TSTRING)
type = "string";
if (TYPE (f) == TSTRUCT && builtin_p (f) == cell_f)
type = "#<...>";
if (TYPE (f) == TBROKEN_HEART)
type = "<3";
if (type != 0)
{
char *s = "cannot apply: ";
eputs (s);
eputs (type);
eputs ("[");
write_error_ (e);
eputs ("]\n");
SCM e = MAKE_STRING0 (s);
return error (cell_symbol_wrong_type_arg, cons (e, f));
}
return cell_unspecified;
}
SCM
pairlis (SCM x, SCM y, SCM a)
{
if (x == cell_nil)
return a;
if (TYPE (x) != TPAIR)
return cons (cons (x, y), a);
return cons (cons (car (x), car (y)), pairlis (cdr (x), cdr (y), a));
}
SCM
set_car_x (SCM x, SCM e)
{
if (TYPE (x) != TPAIR)
error (cell_symbol_not_a_pair, cons (x, cstring_to_symbol ("set-car!")));
CAR (x) = e;
return cell_unspecified;
}
SCM
set_cdr_x (SCM x, SCM e)
{
if (TYPE (x) != TPAIR)
error (cell_symbol_not_a_pair, cons (x, cstring_to_symbol ("set-cdr!")));
CDR (x) = e;
return cell_unspecified;
}
SCM
set_env_x (SCM x, SCM e, SCM a)
{
SCM p;
if (TYPE (x) == TVARIABLE)
p = VARIABLE (x);
else
p = assert_defined (x, module_variable (a, x));
if (TYPE (p) != TPAIR)
error (cell_symbol_not_a_pair, cons (p, x));
return set_cdr_x (p, e);
}
SCM
call_lambda (SCM e, SCM x, SCM aa, SCM a) /*:((internal)) */
{
SCM cl = cons (cons (cell_closure, x), x);
R1 = e;
R0 = cl;
return cell_unspecified;
}
SCM
make_closure_ (SCM args, SCM body, SCM a) /*:((internal)) */
{
return make_cell (TCLOSURE, cell_f, cons (cons (cell_circular, a), cons (args, body)));
}
SCM
make_variable_ (SCM var) /*:((internal)) */
{
return make_cell (TVARIABLE, var, 0);
}
SCM
macro_get_handle (SCM name) /*:((internal)) */
{
if (TYPE (name) == TSYMBOL)
return hashq_get_handle (g_macros, name, cell_nil);
return cell_f;
}
SCM
get_macro (SCM name) /*:((internal)) */
{
SCM m = macro_get_handle (name);
if (m != cell_f)
return MACRO (CDR (m));
return cell_f;
}
SCM
macro_set_x (SCM name, SCM value) /*:((internal)) */
{
return hashq_set_x (g_macros, name, value);
}
SCM
push_cc (SCM p1, SCM p2, SCM a, SCM c) /*:((internal)) */
{
SCM x = R3;
R3 = c;
R2 = p2;
gc_push_frame ();
R1 = p1;
R0 = a;
R3 = x;
return cell_unspecified;
}
SCM
add_formals (SCM formals, SCM x)
{
while (TYPE (x) == TPAIR)
{
formals = cons (CAR (x), formals);
x = CDR (x);
}
if (TYPE (x) == TSYMBOL)
formals = cons (x, formals);
return formals;
}
int
formal_p (SCM x, SCM formals) /*:((internal)) */
{
if (TYPE (formals) == TSYMBOL)
{
if (x == formals)
return 1;
else
return 0;
}
while (TYPE (formals) == TPAIR && CAR (formals) != x)
formals = CDR (formals);
if (TYPE (formals) == TSYMBOL)
return formals == x;
return TYPE (formals) == TPAIR;
}
SCM
expand_variable_ (SCM x, SCM formals, int top_p) /*:((internal)) */
{
while (TYPE (x) == TPAIR)
{
if (TYPE (CAR (x)) == TPAIR)
{
if (CAAR (x) == cell_symbol_lambda)
{
SCM f = CAR (CDAR (x));
formals = add_formals (formals, f);
}
else if (CAAR (x) == cell_symbol_define || CAAR (x) == cell_symbol_define_macro)
{
SCM f = CAR (CDAR (x));
formals = add_formals (formals, f);
}
if (CAAR (x) != cell_symbol_quote)
expand_variable_ (CAR (x), formals, 0);
}
else
{
if (CAR (x) == cell_symbol_lambda)
{
SCM f = CADR (x);
formals = add_formals (formals, f);
x = CDR (x);
}
else if (CAR (x) == cell_symbol_define || CAR (x) == cell_symbol_define_macro)
{
SCM f = CADR (x);
if (top_p && TYPE (f) == TPAIR)
f = CDR (f);
formals = add_formals (formals, f);
x = CDR (x);
}
else if (CAR (x) == cell_symbol_quote)
return cell_unspecified;
else if (TYPE (CAR (x)) == TSYMBOL
&& CAR (x) != cell_symbol_boot_module
&& CAR (x) != cell_symbol_current_module
&& CAR (x) != cell_symbol_primitive_load && !formal_p (CAR (x), formals))
{
SCM v = module_variable (R0, CAR (x));
if (v != cell_f)
CAR (x) = make_variable_ (v);
}
}
x = CDR (x);
top_p = 0;
}
return cell_unspecified;
}
SCM
expand_variable (SCM x, SCM formals) /*:((internal)) */
{
return expand_variable_ (x, formals, 1);
}
SCM
apply_builtin (SCM fn, SCM x) /*:((internal)) */
{
int arity = VALUE (builtin_arity (fn));
if ((arity > 0 || arity == -1) && x != cell_nil && TYPE (CAR (x)) == TVALUES)
x = cons (CADAR (x), CDR (x));
if ((arity > 1 || arity == -1) && x != cell_nil && TYPE (CDR (x)) == TPAIR && TYPE (CADR (x)) == TVALUES)
x = cons (CAR (x), cons (CDADAR (x), CDR (x)));
#if __M2_PLANET__
FUNCTION fp = builtin_function (fn);
if (arity == 0)
return fp ();
else if (arity == 1)
return fp (CAR (x));
else if (arity == 2)
return fp (CAR (x), CADR (x));
else if (arity == 3)
return fp (CAR (x), CADR (x), CAR (CDDR (x)));
else if (arity == -1)
return fp (x);
#else // !__M2_PLANET__
if (arity == 0)
{
SCM (*fp) (void) = (function0_t) builtin_function (fn);
return fp ();
}
else if (arity == 1)
{
SCM (*fp) (SCM) = (function1_t) builtin_function (fn);
return fp (CAR (x));
}
else if (arity == 2)
{
SCM (*fp) (SCM, SCM) = (function2_t) builtin_function (fn);
return fp (CAR (x), CADR (x));
}
else if (arity == 3)
{
SCM (*fp) (SCM, SCM, SCM) = (function3_t) builtin_function (fn);
return fp (CAR (x), CADR (x), CAR (CDDR (x)));
}
else if (arity == -1)
{
SCM (*fp) (SCM) = (function1_t) builtin_function (fn);
return fp (x);
}
#endif //! __M2_PLANET__
return cell_unspecified;
}
SCM
eval_apply ()
{
SCM aa;
SCM args;
SCM body;
SCM cl;
SCM entry;
SCM expanders;
SCM formals;
SCM input;
SCM name;
SCM macro;
SCM p;
SCM program;
SCM sc_expand;
SCM v;
SCM x;
int global_p;
int macro_p;
int t;
long c;
eval_apply:
if (R3 == cell_vm_evlis2)
goto evlis2;
else if (R3 == cell_vm_evlis3)
goto evlis3;
else if (R3 == cell_vm_eval_check_func)
goto eval_check_func;
else if (R3 == cell_vm_eval2)
goto eval2;
else if (R3 == cell_vm_apply2)
goto apply2;
else if (R3 == cell_vm_if_expr)
goto if_expr;
else if (R3 == cell_vm_begin_eval)
goto begin_eval;
else if (R3 == cell_vm_eval_set_x)
goto eval_set_x;
else if (R3 == cell_vm_macro_expand_car)
goto macro_expand_car;
else if (R3 == cell_vm_return)
goto vm_return;
else if (R3 == cell_vm_macro_expand_cdr)
goto macro_expand_cdr;
else if (R3 == cell_vm_eval_define)
goto eval_define;
else if (R3 == cell_vm_macro_expand)
goto macro_expand;
else if (R3 == cell_vm_macro_expand_lambda)
goto macro_expand_lambda;
else if (R3 == cell_vm_eval_pmatch_car)
goto eval_pmatch_car;
else if (R3 == cell_vm_begin_expand_macro)
goto begin_expand_macro;
else if (R3 == cell_vm_macro_expand_define)
goto macro_expand_define;
else if (R3 == cell_vm_begin_expand_eval)
goto begin_expand_eval;
else if (R3 == cell_vm_call_with_current_continuation2)
goto call_with_current_continuation2;
else if (R3 == cell_vm_macro_expand_set_x)
goto macro_expand_set_x;
else if (R3 == cell_vm_eval_pmatch_cdr)
goto eval_pmatch_cdr;
else if (R3 == cell_vm_macro_expand_define_macro)
goto macro_expand_define_macro;
else if (R3 == cell_vm_begin_primitive_load)
goto begin_primitive_load;
else if (R3 == cell_vm_evlis)
goto evlis;
else if (R3 == cell_vm_apply)
goto apply;
else if (R3 == cell_vm_eval)
goto eval;
else if (R3 == cell_vm_eval_macro_expand_eval)
goto eval_macro_expand_eval;
else if (R3 == cell_vm_eval_macro_expand_expand)
goto eval_macro_expand_expand;
else if (R3 == cell_vm_begin)
goto begin;
else if (R3 == cell_vm_begin_expand)
goto begin_expand;
else if (R3 == cell_vm_begin_expand_primitive_load)
goto begin_expand_primitive_load;
else if (R3 == cell_vm_if)
goto vm_if;
else if (R3 == cell_vm_call_with_values2)
goto call_with_values2;
else if (R3 == cell_unspecified)
return R1;
else
error (cell_symbol_system_error, MAKE_STRING0 ("eval/apply unknown continuation"));
evlis:
if (R1 == cell_nil)
goto vm_return;
if (TYPE (R1) != TPAIR)
goto eval;
push_cc (CAR (R1), R1, R0, cell_vm_evlis2);
goto eval;
evlis2:
push_cc (CDR (R2), R1, R0, cell_vm_evlis3);
goto evlis;
evlis3:
R1 = cons (R2, R1);
goto vm_return;
apply:
g_stack_array[g_stack + FRAME_PROCEDURE] = CAR (R1);
t = TYPE (CAR (R1));
if (t == TSTRUCT && builtin_p (CAR (R1)) == cell_t)
{
check_formals (CAR (R1), builtin_arity (CAR (R1)), CDR (R1));
R1 = apply_builtin (CAR (R1), CDR (R1));
goto vm_return;
}
else if (t == TCLOSURE)
{
cl = CLOSURE (CAR (R1));
body = CDDR (cl);
formals = CADR (cl);
args = CDR (R1);
aa = CDAR (cl);
aa = CDR (aa);
check_formals (CAR (R1), formals, CDR (R1));
p = pairlis (formals, args, aa);
call_lambda (body, p, aa, R0);
goto begin;
}
else if (t == TCONTINUATION)
{
v = CONTINUATION (CAR (R1));
if (LENGTH (v) != 0)
{
for (t = 0; t < LENGTH (v); t = t + 1)
g_stack_array[STACK_SIZE - LENGTH (v) + t] = vector_ref_ (v, t);
g_stack = STACK_SIZE - LENGTH (v);
}
x = R1;
gc_pop_frame ();
R1 = CADR (x);
goto eval_apply;
}
else if (t == TSPECIAL)
{
c = CAR (R1);
if (c == cell_vm_apply)
{
push_cc (cons (CADR (R1), CADDR (R1)), R1, R0, cell_vm_return);
goto apply;
}
else if (c == cell_vm_eval)
{
push_cc (CADR (R1), R1, CADDR (R1), cell_vm_return);
goto eval;
}
else if (c == cell_vm_begin_expand)
{
push_cc (cons (CADR (R1), cell_nil), R1, CADDR (R1), cell_vm_return);
goto begin_expand;
}
else if (c == cell_call_with_current_continuation)
{
R1 = CDR (R1);
goto call_with_current_continuation;
}
else
check_apply (cell_f, CAR (R1));
}
else if (t == TSYMBOL)
{
if (CAR (R1) == cell_symbol_call_with_values)
{
R1 = CDR (R1);
goto call_with_values;
}
if (CAR (R1) == cell_symbol_current_module)
{
R1 = R0;
goto vm_return;
}
if (CAR (R1) == cell_symbol_boot_module)
{
R1 = M0;
goto vm_return;
}
}
else if (t == TPAIR)
{
if (CAAR (R1) == cell_symbol_lambda)
{
formals = CADR (CAR (R1));
args = CDR (R1);
body = CDDR (CAR (R1));
p = pairlis (formals, CDR (R1), R0);
check_formals (R1, formals, args);
call_lambda (body, p, p, R0);
goto begin;
}
}
push_cc (CAR (R1), R1, R0, cell_vm_apply2);
goto eval;
apply2:
check_apply (R1, CAR (R2));
R1 = cons (R1, CDR (R2));
goto apply;
eval:
t = TYPE (R1);
if (t == TPAIR)
{
c = CAR (R1);
if (c == cell_symbol_pmatch_car)
{
push_cc (CADR (R1), R1, R0, cell_vm_eval_pmatch_car);
goto eval;
eval_pmatch_car:
x = R1;
gc_pop_frame ();
R1 = CAR (x);
goto eval_apply;
}
else if (c == cell_symbol_pmatch_cdr)
{
push_cc (CADR (R1), R1, R0, cell_vm_eval_pmatch_cdr);
goto eval;
eval_pmatch_cdr:
x = R1;
gc_pop_frame ();
R1 = CDR (x);
goto eval_apply;
}
else if (c == cell_symbol_quote)
{
x = R1;
gc_pop_frame ();
R1 = CADR (x);
goto eval_apply;
}
else if (c == cell_symbol_begin)
goto begin;
else if (c == cell_symbol_lambda)
{
R1 = make_closure_ (CADR (R1), CDDR (R1), R0);
goto vm_return;
}
else if (c == cell_symbol_if)
{
R1 = CDR (R1);
goto vm_if;
}
else if (c == cell_symbol_set_x)
{
push_cc (CAR (CDDR (R1)), R1, R0, cell_vm_eval_set_x);
goto eval;
eval_set_x:
R1 = set_env_x (CADR (R2), R1, R0);
goto vm_return;
}
else if (c == cell_vm_macro_expand)
{
push_cc (CADR (R1), R1, R0, cell_vm_eval_macro_expand_eval);
goto eval;
eval_macro_expand_eval:
push_cc (R1, R2, R0, cell_vm_eval_macro_expand_expand);
goto macro_expand;
eval_macro_expand_expand:
goto vm_return;
}
else
{
if (TYPE (R1) == TPAIR && (CAR (R1) == cell_symbol_define || CAR (R1) == cell_symbol_define_macro))
{
global_p = CAAR (R0) != cell_closure;
macro_p = CAR (R1) == cell_symbol_define_macro;
if (global_p != 0)
{
name = CADR (R1);
if (TYPE (CADR (R1)) == TPAIR)
name = CAR (name);
if (macro_p != 0)
{
entry = assq (name, g_macros);
if (entry == cell_f)
macro_set_x (name, cell_f);
}
else
{
entry = module_variable (R0, name);
if (entry == cell_f)
module_define_x (M0, name, cell_f);
}
}
R2 = R1;
if (TYPE (CADR (R1)) != TPAIR)
{
push_cc (CAR (CDDR (R1)), R2, cons (cons (CADR (R1), CADR (R1)), R0), cell_vm_eval_define);
goto eval;
}
else
{
p = pairlis (CADR (R1), CADR (R1), R0);
formals = CDR (CADR (R1));
body = CDDR (R1);
if (macro_p || global_p)
expand_variable (body, formals);
R1 = cons (cell_symbol_lambda, cons (formals, body));
push_cc (R1, R2, p, cell_vm_eval_define);
goto eval;
}
eval_define:
name = CADR (R2);
if (TYPE (CADR (R2)) == TPAIR)
name = CAR (name);
if (macro_p != 0)
{
entry = macro_get_handle (name);
R1 = MAKE_MACRO (name, R1);
set_cdr_x (entry, R1);
}
else if (global_p != 0)
{
entry = module_variable (R0, name);
set_cdr_x (entry, R1);
}
else
{
entry = cons (name, R1);
aa = cons (entry, cell_nil);
set_cdr_x (aa, cdr (R0));
set_cdr_x (R0, aa);
cl = module_variable (R0, cell_closure);
set_cdr_x (cl, aa);
}
R1 = cell_unspecified;
goto vm_return;
}
push_cc (CAR (R1), R1, R0, cell_vm_eval_check_func);
gc_check ();
goto eval;
eval_check_func:
push_cc (CDR (R2), R2, R0, cell_vm_eval2);
goto evlis;
eval2:
R1 = cons (CAR (R2), R1);
goto apply;
}
}
else if (t == TSYMBOL)
{
if (R1 == cell_symbol_boot_module)
goto vm_return;
if (R1 == cell_symbol_current_module)
goto vm_return;
if (R1 == cell_symbol_begin)
{
R1 = cell_begin;
goto vm_return;
}
R1 = assert_defined (R1, module_ref (R0, R1));
goto vm_return;
}
else if (t == TVARIABLE)
{
R1 = CDR (VARIABLE (R1));
goto vm_return;
}
else if (t == TBROKEN_HEART)
error (cell_symbol_system_error, R1);
else
goto vm_return;
macro_expand:
if (TYPE (R1) != TPAIR || CAR (R1) == cell_symbol_quote)
goto vm_return;
if (CAR (R1) == cell_symbol_lambda)
{
push_cc (CDDR (R1), R1, R0, cell_vm_macro_expand_lambda);
goto macro_expand;
macro_expand_lambda:
CDDR (R2) = R1;
R1 = R2;
goto vm_return;
}
if (TYPE (R1) == TPAIR && (macro = get_macro (CAR (R1))) != cell_f)
{
R1 = cons (macro, CDR (R1));
push_cc (R1, cell_nil, R0, cell_vm_macro_expand);
goto apply;
}
if (CAR (R1) == cell_symbol_define || CAR (R1) == cell_symbol_define_macro)
{
push_cc (CDDR (R1), R1, R0, cell_vm_macro_expand_define);
goto macro_expand;
macro_expand_define:
CDDR (R2) = R1;
R1 = R2;
if (CAR (R1) == cell_symbol_define_macro)
{
push_cc (R1, R1, R0, cell_vm_macro_expand_define_macro);
goto eval;
macro_expand_define_macro:
R1 = R2;
}
goto vm_return;
}
if (CAR (R1) == cell_symbol_set_x)
{
push_cc (CDDR (R1), R1, R0, cell_vm_macro_expand_set_x);
goto macro_expand;
macro_expand_set_x:
CDDR (R2) = R1;
R1 = R2;
goto vm_return;
}
if (TYPE (R1) == TPAIR
&& TYPE (CAR (R1)) == TSYMBOL
&& CAR (R1) != cell_symbol_begin
&& ((macro = macro_get_handle (cell_symbol_portable_macro_expand)) != cell_f)
&& ((expanders = module_ref (R0, cell_symbol_sc_expander_alist)) != cell_undefined)
&& ((macro = assq (CAR (R1), expanders)) != cell_f))
{
sc_expand = module_ref (R0, cell_symbol_macro_expand);
R2 = R1;
if (sc_expand != cell_undefined && sc_expand != cell_f)
{
R1 = cons (sc_expand, cons (R1, cell_nil));
goto apply;
}
}
push_cc (CAR (R1), R1, R0, cell_vm_macro_expand_car);
goto macro_expand;
macro_expand_car:
CAR (R2) = R1;
R1 = R2;
if (CDR (R1) == cell_nil)
goto vm_return;
push_cc (CDR (R1), R1, R0, cell_vm_macro_expand_cdr);
goto macro_expand;
macro_expand_cdr:
CDR (R2) = R1;
R1 = R2;
goto vm_return;
begin:
x = cell_unspecified;
while (R1 != cell_nil)
{
gc_check ();
if (TYPE (R1) == TPAIR)
{
if (CAAR (R1) == cell_symbol_primitive_load)
{
program = cons (CAR (R1), cell_nil);
push_cc (program, R1, R0, cell_vm_begin_primitive_load);
goto begin_expand;
begin_primitive_load:
CAR (R2) = R1;
R1 = R2;
}
}
if (TYPE (R1) == TPAIR && TYPE (CAR (R1)) == TPAIR)
{
if (CAAR (R1) == cell_symbol_begin)
R1 = append2 (CDAR (R1), CDR (R1));
}
if (CDR (R1) == cell_nil)
{
R1 = CAR (R1);
goto eval;
}
push_cc (CAR (R1), R1, R0, cell_vm_begin_eval);
goto eval;
begin_eval:
x = R1;
R1 = CDR (R2);
}
R1 = x;
goto vm_return;
begin_expand:
x = cell_unspecified;
while (R1 != cell_nil)
{
gc_check ();
if (TYPE (R1) == TPAIR)
{
if (TYPE (CAR (R1)) == TPAIR && CAAR (R1) == cell_symbol_begin)
R1 = append2 (CDAR (R1), CDR (R1));
if (CAAR (R1) == cell_symbol_primitive_load)
{
push_cc (CADR (CAR (R1)), R1, R0, cell_vm_begin_expand_primitive_load);
goto eval;
begin_expand_primitive_load:
if (TYPE (R1) == TNUMBER && VALUE (R1) == 0)
0;
else if (TYPE (R1) == TSTRING)
input = set_current_input_port (open_input_file (R1));
else if (TYPE (R1) == TPORT)
input = set_current_input_port (R1);
else
assert_msg (0, "0");
push_cc (input, R2, R0, cell_vm_return);
x = read_input_file_env (R0);
if (g_debug > 5)
module_printer (M0);
gc_pop_frame ();
input = R1;
R1 = x;
set_current_input_port (input);
R1 = cons (cell_symbol_begin, R1);
CAR (R2) = R1;
R1 = R2;
continue;
}
}
push_cc (CAR (R1), R1, R0, cell_vm_begin_expand_macro);
goto macro_expand;
begin_expand_macro:
if (R1 != CAR (R2))
{
CAR (R2) = R1;
R1 = R2;
continue;
}
R1 = R2;
expand_variable (CAR (R1), cell_nil);
push_cc (CAR (R1), R1, R0, cell_vm_begin_expand_eval);
goto eval;
begin_expand_eval:
x = R1;
R1 = CDR (R2);
}
R1 = x;
goto vm_return;
vm_if:
push_cc (CAR (R1), R1, R0, cell_vm_if_expr);
goto eval;
if_expr:
x = R1;
R1 = R2;
if (x != cell_f)
{
R1 = CADR (R1);
goto eval;
}
if (CDDR (R1) != cell_nil)
{
R1 = CAR (CDDR (R1));
goto eval;
}
R1 = cell_unspecified;
goto vm_return;
call_with_current_continuation:
gc_push_frame ();
x = MAKE_CONTINUATION (g_continuations);
g_continuations = g_continuations + 1;
v = make_vector__ (STACK_SIZE - g_stack);
for (t = g_stack; t < STACK_SIZE; t = t + 1)
vector_set_x_ (v, t - g_stack, g_stack_array[t]);
CONTINUATION (x) = v;
gc_pop_frame ();
push_cc (cons (CAR (R1), cons (x, cell_nil)), x, R0, cell_vm_call_with_current_continuation2);
goto apply;
call_with_current_continuation2:
v = make_vector__ (STACK_SIZE - g_stack);
for (t = g_stack; t < STACK_SIZE; t = t + 1)
vector_set_x_ (v, t - g_stack, g_stack_array[t]);
CONTINUATION (R2) = v;
goto vm_return;
call_with_values:
push_cc (cons (CAR (R1), cell_nil), R1, R0, cell_vm_call_with_values2);
goto apply;
call_with_values2:
if (TYPE (R1) == TVALUES)
R1 = CDR (R1);
R1 = cons (CADR (R2), R1);
goto apply;
vm_return:
x = R1;
gc_pop_frame ();
R1 = x;
goto eval_apply;
}
SCM
apply (SCM f, SCM x, SCM a) /*:((internal)) */
{
push_cc (cons (f, x), cell_unspecified, R0, cell_unspecified);
R3 = cell_vm_apply;
return eval_apply ();
}
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