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guile/libguile/eval.c
Gary Houston afe5177e7f * acconfig.h: add HAVE_ARRAYS. 
* configure.in: add --disable-arrays option, probably temporary.

	* the following changes allow guile to be built with the array
	"module" omitted.  some of this stuff is just tc7 type support,
	which wouldn't be needed if uniform array types were converted
	to smobs.

	* tag.c (scm_utag_bvect ... scm_utag_cvect): don't define unless
	HAVE_ARRAYS.
	(scm_tag): don't check array types unless HAVE_ARRAYS.

	* sort.c (scm_restricted_vector_sort_x, scm_sorted_p):
	remove the unused array types.
	* (scm_stable_sort, scm_sort): don't support vectors if not
	HAVE_ARRAYS.  a bit excessive.

	* random.c (vector_scale, vector_sum_squares,
	scm_random_solid_sphere_x, scm_random_hollow_sphere_x,
	scm_random_normal_vector_x): don't define unless HAVE_ARRAYS.

	* gh_data.c (makvect, gh_chars2byvect, gh_shorts2svect,
	gh_longs2ivect,	gh_ulongs2uvect, gh_floats2fvect, gh_doubles2dvect,
	gh_uniform_vector_length, gh_uniform_vector_ref):
	don't define unless HAVE_ARRAYS.
	(gh_scm2chars, gh_scm2shorts, gh_scm2longs, gh_scm2floats,
	gh_scm2doubles):
	don't check vector types if not HAVE_ARRAYS.

	* eq.c (scm_equal_p), eval.c (SCM_CEVAL), print.c (scm_iprin1),
	gc.c (scm_gc_mark, scm_gc_sweep), objects.c (scm_class_of):
	don't support the array types unless HAVE_ARRAYS is defined.

	* tags.h: make nine tc7 types conditional on HAVE_ARRAYS.

	* read.c (scm_lreadr): don't check for #* unless HAVE_ARRAYS is
	defined (this should use read-hash-extend).

	* ramap.c, unif.c: don't check whether ARRAYS is defined.

	* vectors.c (scm_vector_set_length_x): moved here from unif.c.  call
	scm_uniform_element_size if HAVE_ARRAYS.
	vectors.h: prototype too.

	* unif.c (scm_uniform_element_size): new procedure.

	* init.c (scm_boot_guile_1): don't call scm_init_ramap or
	scm_init_unif unless HAVE_ARRAYS is defined.

	* __scm.h: don't define ARRAYS.

	* Makefile.am (EXTRA_libguile_la_SOURCES): unif.c and ramap.c
	moved here from	libguile_la_SOURCES.


	* Makefile.am (ice9_sources): add arrays.scm.

	* boot-9.scm: load arrays.scm if 'array is provided.

	* arrays.scm: new file with stuff from boot-9.scm.
1999-11-19 18:16:19 +00:00

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/* Copyright (C) 1995,1996,1997,1998, 1999 Free Software Foundation, Inc.
*
* This program 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 2, or (at your option)
* any later version.
*
* This program 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 this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* This file is read twice in order to produce debugging versions of
* scm_ceval and scm_apply. These functions, scm_deval and
* scm_dapply, are produced when we define the preprocessor macro
* DEVAL. The file is divided into sections which are treated
* differently with respect to DEVAL. The heads of these sections are
* marked with the string "SECTION:".
*/
/* SECTION: This code is compiled once.
*/
#ifndef DEVAL
/* We need this to get the definitions for HAVE_ALLOCA_H, etc. */
#include "scmconfig.h"
/* AIX requires this to be the first thing in the file. The #pragma
directive is indented so pre-ANSI compilers will ignore it, rather
than choke on it. */
#ifndef __GNUC__
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include <stdio.h>
#include "_scm.h"
#include "debug.h"
#include "alist.h"
#include "eq.h"
#include "continuations.h"
#include "throw.h"
#include "smob.h"
#include "macros.h"
#include "procprop.h"
#include "hashtab.h"
#include "hash.h"
#include "srcprop.h"
#include "stackchk.h"
#include "objects.h"
#include "feature.h"
#include "modules.h"
#include "eval.h"
SCM (*scm_memoize_method) (SCM, SCM);
/* The evaluator contains a plethora of EVAL symbols.
* This is an attempt at explanation.
*
* The following macros should be used in code which is read twice
* (where the choice of evaluator is hard soldered):
*
* SCM_CEVAL is the symbol used within one evaluator to call itself.
* Originally, it is defined to scm_ceval, but is redefined to
* scm_deval during the second pass.
*
* SIDEVAL corresponds to SCM_CEVAL, but is used in situations where
* only side effects of expressions matter. All immediates are
* ignored.
*
* SCM_EVALIM is used when it is known that the expression is an
* immediate. (This macro never calls an evaluator.)
*
* EVALCAR evaluates the car of an expression.
*
* EVALCELLCAR is like EVALCAR, but is used when it is known that the
* car is a lisp cell.
*
* The following macros should be used in code which is read once
* (where the choice of evaluator is dynamic):
*
* SCM_XEVAL takes care of immediates without calling an evaluator. It
* then calls scm_ceval *or* scm_deval, depending on the debugging
* mode.
*
* SCM_XEVALCAR corresponds to EVALCAR, but uses scm_ceval *or* scm_deval
* depending on the debugging mode.
*
* The main motivation for keeping this plethora is efficiency
* together with maintainability (=> locality of code).
*/
#define SCM_CEVAL scm_ceval
#define SIDEVAL(x, env) if (SCM_NIMP(x)) SCM_CEVAL((x), (env))
#define EVALCELLCAR(x, env) (SCM_SYMBOLP (SCM_CAR(x)) \
? *scm_lookupcar(x, env, 1) \
: SCM_CEVAL(SCM_CAR(x), env))
#define EVALCAR(x, env) (SCM_NCELLP(SCM_CAR(x))\
? (SCM_IMP(SCM_CAR(x)) \
? SCM_EVALIM(SCM_CAR(x), env) \
: SCM_GLOC_VAL(SCM_CAR(x))) \
: EVALCELLCAR(x, env))
#define EXTEND_ENV SCM_EXTEND_ENV
#ifdef MEMOIZE_LOCALS
SCM *
scm_ilookup (iloc, env)
SCM iloc;
SCM env;
{
register int ir = SCM_IFRAME (iloc);
register SCM er = env;
for (; 0 != ir; --ir)
er = SCM_CDR (er);
er = SCM_CAR (er);
for (ir = SCM_IDIST (iloc); 0 != ir; --ir)
er = SCM_CDR (er);
if (SCM_ICDRP (iloc))
return SCM_CDRLOC (er);
return SCM_CARLOC (SCM_CDR (er));
}
#endif
#ifdef USE_THREADS
/* The Lookup Car Race
- by Eva Luator
Memoization of variables and special forms is done while executing
the code for the first time. As long as there is only one thread
everything is fine, but as soon as two threads execute the same
code concurrently `for the first time' they can come into conflict.
This memoization includes rewriting variable references into more
efficient forms and expanding macros. Furthermore, macro expansion
includes `compiling' special forms like `let', `cond', etc. into
tree-code instructions.
There shouldn't normally be a problem with memoizing local and
global variable references (into ilocs and glocs), because all
threads will mutate the code in *exactly* the same way and (if I
read the C code correctly) it is not possible to observe a half-way
mutated cons cell. The lookup procedure can handle this
transparently without any critical sections.
It is different with macro expansion, because macro expansion
happens outside of the lookup procedure and can't be
undone. Therefore it can't cope with it. It has to indicate
failure when it detects a lost race and hope that the caller can
handle it. Luckily, it turns out that this is the case.
An example to illustrate this: Suppose that the follwing form will
be memoized concurrently by two threads
(let ((x 12)) x)
Let's first examine the lookup of X in the body. The first thread
decides that it has to find the symbol "x" in the environment and
starts to scan it. Then the other thread takes over and actually
overtakes the first. It looks up "x" and substitutes an
appropriate iloc for it. Now the first thread continues and
completes its lookup. It comes to exactly the same conclusions as
the second one and could - without much ado - just overwrite the
iloc with the same iloc.
But let's see what will happen when the race occurs while looking
up the symbol "let" at the start of the form. It could happen that
the second thread interrupts the lookup of the first thread and not
only substitutes a gloc for it but goes right ahead and replaces it
with the compiled form (#@let* (x 12) x). Now, when the first
thread completes its lookup, it would replace the #@let* with a
gloc pointing to the "let" binding, effectively reverting the form
to (let (x 12) x). This is wrong. It has to detect that it has
lost the race and the evaluator has to reconsider the changed form
completely.
This race condition could be resolved with some kind of traffic
light (like mutexes) around scm_lookupcar, but I think that it is
best to avoid them in this case. They would serialize memoization
completely and because lookup involves calling arbitrary Scheme
code (via the lookup-thunk), threads could be blocked for an
arbitrary amount of time or even deadlock. But with the current
solution a lot of unnecessary work is potentially done. */
/* SCM_LOOKUPCAR1 is was SCM_LOOKUPCAR used to be but is allowed to
return NULL to indicate a failed lookup due to some race conditions
between threads. This only happens when VLOC is the first cell of
a special form that will eventually be memoized (like `let', etc.)
In that case the whole lookup is bogus and the caller has to
reconsider the complete special form.
SCM_LOOKUPCAR is still there, of course. It just calls
SCM_LOOKUPCAR1 and aborts on recieving NULL. So SCM_LOOKUPCAR
should only be called when it is known that VLOC is not the first
pair of a special form. Otherwise, use SCM_LOOKUPCAR1 and check
for NULL. I think I've found the only places where this
applies. */
#endif /* USE_THREADS */
/* scm_lookupcar returns a pointer to this when a variable could not
be found and it should not throw an error. Never assign to this.
*/
static scm_cell undef_cell = { SCM_UNDEFINED, SCM_UNDEFINED };
#ifdef USE_THREADS
static SCM *
scm_lookupcar1 (SCM vloc, SCM genv, int check)
#else
SCM *
scm_lookupcar (SCM vloc, SCM genv, int check)
#endif
{
SCM env = genv;
register SCM *al, fl, var = SCM_CAR (vloc);
#ifdef USE_THREADS
register SCM var2 = var;
#endif
#ifdef MEMOIZE_LOCALS
register SCM iloc = SCM_ILOC00;
#endif
for (; SCM_NIMP (env); env = SCM_CDR (env))
{
if (SCM_BOOL_T == scm_procedure_p (SCM_CAR (env)))
break;
al = SCM_CARLOC (env);
for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl))
{
if (SCM_NCONSP (fl))
{
if (fl == var)
{
#ifdef MEMOIZE_LOCALS
#ifdef USE_THREADS
if (SCM_CAR (vloc) != var)
goto race;
#endif
SCM_SETCAR (vloc, iloc + SCM_ICDR);
#endif
return SCM_CDRLOC (*al);
}
else
break;
}
al = SCM_CDRLOC (*al);
if (SCM_CAR (fl) == var)
{
#ifdef MEMOIZE_LOCALS
#ifndef SCM_RECKLESS /* letrec inits to SCM_UNDEFINED */
if (SCM_UNBNDP (SCM_CAR (*al)))
{
env = SCM_EOL;
goto errout;
}
#endif
#ifdef USE_THREADS
if (SCM_CAR (vloc) != var)
goto race;
#endif
SCM_SETCAR (vloc, iloc);
#endif
return SCM_CARLOC (*al);
}
#ifdef MEMOIZE_LOCALS
iloc += SCM_IDINC;
#endif
}
#ifdef MEMOIZE_LOCALS
iloc = (~SCM_IDSTMSK) & (iloc + SCM_IFRINC);
#endif
}
{
SCM top_thunk, vcell;
if (SCM_NIMP(env))
{
top_thunk = SCM_CAR(env); /* env now refers to a top level env thunk */
env = SCM_CDR (env);
}
else
top_thunk = SCM_BOOL_F;
vcell = scm_sym2vcell (var, top_thunk, SCM_BOOL_F);
if (vcell == SCM_BOOL_F)
goto errout;
else
var = vcell;
}
#ifndef SCM_RECKLESS
if (SCM_NNULLP (env) || SCM_UNBNDP (SCM_CDR (var)))
{
var = SCM_CAR (var);
errout:
/* scm_everr (vloc, genv,...) */
if (check)
scm_misc_error (NULL,
SCM_NULLP (env)
? "Unbound variable: %S"
: "Damaged environment: %S",
scm_listify (var, SCM_UNDEFINED));
else
return SCM_CDRLOC (&undef_cell);
}
#endif
#ifdef USE_THREADS
if (SCM_CAR (vloc) != var2)
{
/* Some other thread has changed the very cell we are working
on. In effect, it must have done our job or messed it up
completely. */
race:
var = SCM_CAR (vloc);
if ((var & 7) == 1)
return SCM_GLOC_VAL_LOC (var);
#ifdef MEMOIZE_LOCALS
if ((var & 127) == (127 & SCM_ILOC00))
return scm_ilookup (var, genv);
#endif
/* We can't cope with anything else than glocs and ilocs. When
a special form has been memoized (i.e. `let' into `#@let') we
return NULL and expect the calling function to do the right
thing. For the evaluator, this means going back and redoing
the dispatch on the car of the form. */
return NULL;
}
#endif /* USE_THREADS */
SCM_SETCAR (vloc, var + 1);
/* Except wait...what if the var is not a vcell,
* but syntax or something.... */
return SCM_CDRLOC (var);
}
#ifdef USE_THREADS
SCM *
scm_lookupcar (vloc, genv, check)
SCM vloc;
SCM genv;
int check;
{
SCM *loc = scm_lookupcar1 (vloc, genv, check);
if (loc == NULL)
abort ();
return loc;
}
#endif
#define unmemocar scm_unmemocar
SCM
scm_unmemocar (form, env)
SCM form;
SCM env;
{
#ifdef DEBUG_EXTENSIONS
register int ir;
#endif
SCM c;
if (SCM_IMP (form))
return form;
c = SCM_CAR (form);
if (1 == (c & 7))
SCM_SETCAR (form, SCM_CAR (c - 1));
#ifdef MEMOIZE_LOCALS
#ifdef DEBUG_EXTENSIONS
else if (SCM_ILOCP (c))
{
for (ir = SCM_IFRAME (c); ir != 0; --ir)
env = SCM_CDR (env);
env = SCM_CAR (SCM_CAR (env));
for (ir = SCM_IDIST (c); ir != 0; --ir)
env = SCM_CDR (env);
SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env));
}
#endif
#endif
return form;
}
SCM
scm_eval_car (pair, env)
SCM pair;
SCM env;
{
return SCM_XEVALCAR (pair, env);
}
/*
* The following rewrite expressions and
* some memoized forms have different syntax
*/
const char scm_s_expression[] = "missing or extra expression";
const char scm_s_test[] = "bad test";
const char scm_s_body[] = "bad body";
const char scm_s_bindings[] = "bad bindings";
const char scm_s_variable[] = "bad variable";
const char scm_s_clauses[] = "bad or missing clauses";
const char scm_s_formals[] = "bad formals";
SCM scm_sym_dot, scm_sym_arrow, scm_sym_else;
SCM scm_sym_unquote, scm_sym_uq_splicing, scm_sym_apply;
SCM scm_f_apply;
#ifdef DEBUG_EXTENSIONS
SCM scm_sym_enter_frame, scm_sym_apply_frame, scm_sym_exit_frame;
SCM scm_sym_trace;
#endif
#define ASRTSYNTAX(cond_, msg_) if(!(cond_))scm_wta(xorig, (msg_), what);
static void bodycheck SCM_P ((SCM xorig, SCM *bodyloc, const char *what));
static void
bodycheck (xorig, bodyloc, what)
SCM xorig;
SCM *bodyloc;
const char *what;
{
ASRTSYNTAX (scm_ilength (*bodyloc) >= 1, scm_s_expression);
}
/* Check that the body denoted by XORIG is valid and rewrite it into
its internal form. The internal form of a body is just the body
itself, but prefixed with an ISYM that denotes to what kind of
outer construct this body belongs. A lambda body starts with
SCM_IM_LAMBDA, for example, a body of a let starts with SCM_IM_LET,
etc. The one exception is a body that belongs to a letrec that has
been formed by rewriting internal defines: it starts with
SCM_IM_DEFINE. */
/* XXX - Besides controlling the rewriting of internal defines, the
additional ISYM could be used for improved error messages.
This is not done yet. */
static SCM
scm_m_body (op, xorig, what)
SCM op;
SCM xorig;
char *what;
{
ASRTSYNTAX (scm_ilength (xorig) >= 1, scm_s_expression);
/* Don't add another ISYM if one is present already. */
if (SCM_ISYMP (SCM_CAR (xorig)))
return xorig;
/* Retain possible doc string. */
if (SCM_IMP (SCM_CAR(xorig)) || SCM_NCONSP (SCM_CAR (xorig)))
{
if (SCM_NNULLP (SCM_CDR(xorig)))
return scm_cons (SCM_CAR (xorig),
scm_m_body (op, SCM_CDR(xorig), what));
return xorig;
}
return scm_cons2 (op, SCM_CAR (xorig), SCM_CDR(xorig));
}
SCM_SYNTAX(s_quote,"quote", scm_makmmacro, scm_m_quote);
SCM_GLOBAL_SYMBOL(scm_sym_quote, s_quote);
SCM
scm_m_quote (xorig, env)
SCM xorig;
SCM env;
{
SCM x = scm_copy_tree (SCM_CDR (xorig));
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
xorig, scm_s_expression, s_quote);
return scm_cons (SCM_IM_QUOTE, x);
}
SCM_SYNTAX(s_begin, "begin", scm_makmmacro, scm_m_begin);
SCM_GLOBAL_SYMBOL(scm_sym_begin, s_begin);
SCM
scm_m_begin (xorig, env)
SCM xorig;
SCM env;
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) >= 1,
xorig, scm_s_expression, s_begin);
return scm_cons (SCM_IM_BEGIN, SCM_CDR (xorig));
}
SCM_SYNTAX(s_if, "if", scm_makmmacro, scm_m_if);
SCM_GLOBAL_SYMBOL(scm_sym_if, s_if);
SCM
scm_m_if (xorig, env)
SCM xorig;
SCM env;
{
int len = scm_ilength (SCM_CDR (xorig));
SCM_ASSYNT (len >= 2 && len <= 3, xorig, scm_s_expression, "if");
return scm_cons (SCM_IM_IF, SCM_CDR (xorig));
}
/* Will go into the RnRS module when Guile is factorized.
SCM_SYNTAX(scm_s_set_x,"set!", scm_makmmacro, scm_m_set_x); */
const char scm_s_set_x[] = "set!";
SCM_GLOBAL_SYMBOL(scm_sym_set_x, scm_s_set_x);
SCM
scm_m_set_x (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig);
SCM_ASSYNT (2 == scm_ilength (x), xorig, scm_s_expression, scm_s_set_x);
SCM_ASSYNT (SCM_NIMP (SCM_CAR (x)) && SCM_SYMBOLP (SCM_CAR (x)),
xorig, scm_s_variable, scm_s_set_x);
return scm_cons (SCM_IM_SET_X, x);
}
#if 0
SCM
scm_m_vref (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig);
SCM_ASSYNT (1 == scm_ilength (x), xorig, scm_s_expression, s_vref);
if (SCM_NIMP(x) && UDSCM_VARIABLEP (SCM_CAR (x)))
{
/* scm_everr (SCM_UNDEFINED, env,..., "global variable reference") */
scm_misc_error (NULL,
"Bad variable: %S",
scm_listify (SCM_CAR (SCM_CDR (x)), SCM_UNDEFINED));
}
SCM_ASSYNT (SCM_NIMP(x) && DEFSCM_VARIABLEP (SCM_CAR (x)),
xorig, scm_s_variable, s_vref);
return scm_cons (IM_VREF, x);
}
SCM
scm_m_vset (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig);
SCM_ASSYNT (3 == scm_ilength (x), xorig, scm_s_expression, s_vset);
SCM_ASSYNT ((DEFSCM_VARIABLEP (SCM_CAR (x))
|| UDSCM_VARIABLEP (SCM_CAR (x))),
xorig, scm_s_variable, s_vset);
return scm_cons (IM_VSET, x);
}
#endif
SCM_SYNTAX(s_and, "and", scm_makmmacro, scm_m_and);
SCM_GLOBAL_SYMBOL(scm_sym_and, s_and);
SCM
scm_m_and (xorig, env)
SCM xorig;
SCM env;
{
int len = scm_ilength (SCM_CDR (xorig));
SCM_ASSYNT (len >= 0, xorig, scm_s_test, s_and);
if (len >= 1)
return scm_cons (SCM_IM_AND, SCM_CDR (xorig));
else
return SCM_BOOL_T;
}
SCM_SYNTAX(s_or,"or", scm_makmmacro, scm_m_or);
SCM_GLOBAL_SYMBOL(scm_sym_or,s_or);
SCM
scm_m_or (xorig, env)
SCM xorig;
SCM env;
{
int len = scm_ilength (SCM_CDR (xorig));
SCM_ASSYNT (len >= 0, xorig, scm_s_test, s_or);
if (len >= 1)
return scm_cons (SCM_IM_OR, SCM_CDR (xorig));
else
return SCM_BOOL_F;
}
SCM_SYNTAX(s_case, "case", scm_makmmacro, scm_m_case);
SCM_GLOBAL_SYMBOL(scm_sym_case, s_case);
SCM
scm_m_case (xorig, env)
SCM xorig;
SCM env;
{
SCM proc, cdrx = scm_list_copy (SCM_CDR (xorig)), x = cdrx;
SCM_ASSYNT (scm_ilength (x) >= 2, xorig, scm_s_clauses, s_case);
while (SCM_NIMP (x = SCM_CDR (x)))
{
proc = SCM_CAR (x);
SCM_ASSYNT (scm_ilength (proc) >= 2, xorig, scm_s_clauses, s_case);
SCM_ASSYNT (scm_ilength (SCM_CAR (proc)) >= 0
|| scm_sym_else == SCM_CAR (proc),
xorig, scm_s_clauses, s_case);
}
return scm_cons (SCM_IM_CASE, cdrx);
}
SCM_SYNTAX(s_cond, "cond", scm_makmmacro, scm_m_cond);
SCM_GLOBAL_SYMBOL(scm_sym_cond, s_cond);
SCM
scm_m_cond (xorig, env)
SCM xorig;
SCM env;
{
SCM arg1, cdrx = scm_list_copy (SCM_CDR (xorig)), x = cdrx;
int len = scm_ilength (x);
SCM_ASSYNT (len >= 1, xorig, scm_s_clauses, s_cond);
while (SCM_NIMP (x))
{
arg1 = SCM_CAR (x);
len = scm_ilength (arg1);
SCM_ASSYNT (len >= 1, xorig, scm_s_clauses, s_cond);
if (scm_sym_else == SCM_CAR (arg1))
{
SCM_ASSYNT (SCM_NULLP (SCM_CDR (x)) && len >= 2,
xorig, "bad ELSE clause", s_cond);
SCM_SETCAR (arg1, SCM_BOOL_T);
}
if (len >= 2 && scm_sym_arrow == SCM_CAR (SCM_CDR (arg1)))
SCM_ASSYNT (3 == len && SCM_NIMP (SCM_CAR (SCM_CDR (SCM_CDR (arg1)))),
xorig, "bad recipient", s_cond);
x = SCM_CDR (x);
}
return scm_cons (SCM_IM_COND, cdrx);
}
SCM_SYNTAX(s_lambda, "lambda", scm_makmmacro, scm_m_lambda);
SCM_GLOBAL_SYMBOL(scm_sym_lambda, s_lambda);
SCM
scm_m_lambda (xorig, env)
SCM xorig;
SCM env;
{
SCM proc, x = SCM_CDR (xorig);
if (scm_ilength (x) < 2)
goto badforms;
proc = SCM_CAR (x);
if (SCM_NULLP (proc))
goto memlambda;
if (SCM_IM_LET == proc) /* named let */
goto memlambda;
if (SCM_IMP (proc))
goto badforms;
if (SCM_SYMBOLP (proc))
goto memlambda;
if (SCM_NCONSP (proc))
goto badforms;
while (SCM_NIMP (proc))
{
if (SCM_NCONSP (proc))
{
if (!SCM_SYMBOLP (proc))
goto badforms;
else
goto memlambda;
}
if (!(SCM_NIMP (SCM_CAR (proc)) && SCM_SYMBOLP (SCM_CAR (proc))))
goto badforms;
proc = SCM_CDR (proc);
}
if (SCM_NNULLP (proc))
{
badforms:
scm_wta (xorig, scm_s_formals, s_lambda);
}
memlambda:
return scm_cons2 (SCM_IM_LAMBDA, SCM_CAR (x),
scm_m_body (SCM_IM_LAMBDA, SCM_CDR (x), s_lambda));
}
SCM_SYNTAX(s_letstar,"let*", scm_makmmacro, scm_m_letstar);
SCM_GLOBAL_SYMBOL(scm_sym_letstar,s_letstar);
SCM
scm_m_letstar (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig), arg1, proc, vars = SCM_EOL, *varloc = &vars;
int len = scm_ilength (x);
SCM_ASSYNT (len >= 2, xorig, scm_s_body, s_letstar);
proc = SCM_CAR (x);
SCM_ASSYNT (scm_ilength (proc) >= 0, xorig, scm_s_bindings, s_letstar);
while (SCM_NIMP (proc))
{
arg1 = SCM_CAR (proc);
SCM_ASSYNT (2 == scm_ilength (arg1), xorig, scm_s_bindings, s_letstar);
SCM_ASSYNT (SCM_NIMP (SCM_CAR (arg1)) && SCM_SYMBOLP (SCM_CAR (arg1)),
xorig, scm_s_variable, s_letstar);
*varloc = scm_cons2 (SCM_CAR (arg1), SCM_CAR (SCM_CDR (arg1)), SCM_EOL);
varloc = SCM_CDRLOC (SCM_CDR (*varloc));
proc = SCM_CDR (proc);
}
x = scm_cons (vars, SCM_CDR (x));
return scm_cons2 (SCM_IM_LETSTAR, SCM_CAR (x),
scm_m_body (SCM_IM_LETSTAR, SCM_CDR (x), s_letstar));
}
/* DO gets the most radically altered syntax
(do ((<var1> <init1> <step1>)
(<var2> <init2>)
... )
(<test> <return>)
<body>)
;; becomes
(do_mem (varn ... var2 var1)
(<init1> <init2> ... <initn>)
(<test> <return>)
(<body>)
<step1> <step2> ... <stepn>) ;; missing steps replaced by var
*/
SCM_SYNTAX(s_do, "do", scm_makmmacro, scm_m_do);
SCM_GLOBAL_SYMBOL(scm_sym_do, s_do);
SCM
scm_m_do (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig), arg1, proc;
SCM vars = SCM_EOL, inits = SCM_EOL, steps = SCM_EOL;
SCM *initloc = &inits, *steploc = &steps;
int len = scm_ilength (x);
SCM_ASSYNT (len >= 2, xorig, scm_s_test, "do");
proc = SCM_CAR (x);
SCM_ASSYNT (scm_ilength (proc) >= 0, xorig, scm_s_bindings, "do");
while (SCM_NIMP(proc))
{
arg1 = SCM_CAR (proc);
len = scm_ilength (arg1);
SCM_ASSYNT (2 == len || 3 == len, xorig, scm_s_bindings, "do");
SCM_ASSYNT (SCM_NIMP (SCM_CAR (arg1)) && SCM_SYMBOLP (SCM_CAR (arg1)),
xorig, scm_s_variable, "do");
/* vars reversed here, inits and steps reversed at evaluation */
vars = scm_cons (SCM_CAR (arg1), vars); /* variable */
arg1 = SCM_CDR (arg1);
*initloc = scm_cons (SCM_CAR (arg1), SCM_EOL); /* init */
initloc = SCM_CDRLOC (*initloc);
arg1 = SCM_CDR (arg1);
*steploc = scm_cons (SCM_IMP (arg1) ? SCM_CAR (vars) : SCM_CAR (arg1), SCM_EOL); /* step */
steploc = SCM_CDRLOC (*steploc);
proc = SCM_CDR (proc);
}
x = SCM_CDR (x);
SCM_ASSYNT (scm_ilength (SCM_CAR (x)) >= 1, xorig, scm_s_test, "do");
x = scm_cons2 (SCM_CAR (x), SCM_CDR (x), steps);
x = scm_cons2 (vars, inits, x);
bodycheck (xorig, SCM_CARLOC (SCM_CDR (SCM_CDR (x))), "do");
return scm_cons (SCM_IM_DO, x);
}
/* evalcar is small version of inline EVALCAR when we don't care about
* speed
*/
#define evalcar scm_eval_car
static SCM iqq SCM_P ((SCM form, SCM env, int depth));
SCM_SYNTAX(s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote);
SCM_GLOBAL_SYMBOL(scm_sym_quasiquote, s_quasiquote);
SCM
scm_m_quasiquote (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig);
SCM_ASSYNT (scm_ilength (x) == 1, xorig, scm_s_expression, s_quasiquote);
return iqq (SCM_CAR (x), env, 1);
}
static SCM
iqq (form, env, depth)
SCM form;
SCM env;
int depth;
{
SCM tmp;
int edepth = depth;
if (SCM_IMP(form))
return form;
if (SCM_VECTORP (form))
{
long i = SCM_LENGTH (form);
SCM *data = SCM_VELTS (form);
tmp = SCM_EOL;
for (; --i >= 0;)
tmp = scm_cons (data[i], tmp);
return scm_vector (iqq (tmp, env, depth));
}
if (SCM_NCONSP(form))
return form;
tmp = SCM_CAR (form);
if (scm_sym_quasiquote == tmp)
{
depth++;
goto label;
}
if (scm_sym_unquote == tmp)
{
--depth;
label:
form = SCM_CDR (form);
SCM_ASSERT (SCM_NIMP (form) && SCM_ECONSP (form) && SCM_NULLP (SCM_CDR (form)),
form, SCM_ARG1, s_quasiquote);
if (0 == depth)
return evalcar (form, env);
return scm_cons2 (tmp, iqq (SCM_CAR (form), env, depth), SCM_EOL);
}
if (SCM_NIMP (tmp) && (scm_sym_uq_splicing == SCM_CAR (tmp)))
{
tmp = SCM_CDR (tmp);
if (0 == --edepth)
return scm_append (scm_cons2 (evalcar (tmp, env), iqq (SCM_CDR (form), env, depth), SCM_EOL));
}
return scm_cons (iqq (SCM_CAR (form), env, edepth), iqq (SCM_CDR (form), env, depth));
}
/* Here are acros which return values rather than code. */
SCM_SYNTAX (s_delay, "delay", scm_makmmacro, scm_m_delay);
SCM_GLOBAL_SYMBOL (scm_sym_delay, s_delay);
SCM
scm_m_delay (xorig, env)
SCM xorig;
SCM env;
{
SCM_ASSYNT (scm_ilength (xorig) == 2, xorig, scm_s_expression, s_delay);
return scm_cons2 (SCM_IM_DELAY, SCM_EOL, SCM_CDR (xorig));
}
SCM_SYNTAX(s_define, "define", scm_makmmacro, scm_m_define);
SCM_GLOBAL_SYMBOL(scm_sym_define, s_define);
SCM
scm_m_define (x, env)
SCM x;
SCM env;
{
SCM proc, arg1 = x;
x = SCM_CDR (x);
/* SCM_ASSYNT(SCM_NULLP(env), x, "bad placement", s_define);*/
SCM_ASSYNT (scm_ilength (x) >= 2, arg1, scm_s_expression, s_define);
proc = SCM_CAR (x);
x = SCM_CDR (x);
while (SCM_NIMP (proc) && SCM_CONSP (proc))
{ /* nested define syntax */
x = scm_cons (scm_cons2 (scm_sym_lambda, SCM_CDR (proc), x), SCM_EOL);
proc = SCM_CAR (proc);
}
SCM_ASSYNT (SCM_NIMP (proc) && SCM_SYMBOLP (proc),
arg1, scm_s_variable, s_define);
SCM_ASSYNT (1 == scm_ilength (x), arg1, scm_s_expression, s_define);
if (SCM_TOP_LEVEL (env))
{
x = evalcar (x, env);
#ifdef DEBUG_EXTENSIONS
if (SCM_REC_PROCNAMES_P && SCM_NIMP (x))
{
arg1 = x;
proc:
if (SCM_CLOSUREP (arg1)
/* Only the first definition determines the name. */
&& scm_procedure_property (arg1, scm_sym_name) == SCM_BOOL_F)
scm_set_procedure_property_x (arg1, scm_sym_name, proc);
else if (SCM_TYP16 (arg1) == scm_tc16_macro
&& SCM_CDR (arg1) != arg1)
{
arg1 = SCM_CDR (arg1);
goto proc;
}
}
#endif
arg1 = scm_sym2vcell (proc, scm_env_top_level (env), SCM_BOOL_T);
#if 0
#ifndef SCM_RECKLESS
if (SCM_NIMP (SCM_CDR (arg1)) && ((SCM) SCM_SNAME (SCM_CDR (arg1)) == proc)
&& (SCM_CDR (arg1) != x))
scm_warn ("redefining built-in ", SCM_CHARS (proc));
else
#endif
if (5 <= scm_verbose && SCM_UNDEFINED != SCM_CDR (arg1))
scm_warn ("redefining ", SCM_CHARS (proc));
#endif
SCM_SETCDR (arg1, x);
#ifdef SICP
return scm_cons2 (scm_sym_quote, SCM_CAR (arg1), SCM_EOL);
#else
return SCM_UNSPECIFIED;
#endif
}
return scm_cons2 (SCM_IM_DEFINE, proc, x);
}
/* end of acros */
static SCM
scm_m_letrec1 (op, imm, xorig, env)
SCM op;
SCM imm;
SCM xorig;
SCM env;
{
SCM cdrx = SCM_CDR (xorig); /* locally mutable version of form */
char *what = SCM_CHARS (SCM_CAR (xorig));
SCM x = cdrx, proc, arg1; /* structure traversers */
SCM vars = SCM_EOL, inits = SCM_EOL, *initloc = &inits;
proc = SCM_CAR (x);
ASRTSYNTAX (scm_ilength (proc) >= 1, scm_s_bindings);
do
{
/* vars scm_list reversed here, inits reversed at evaluation */
arg1 = SCM_CAR (proc);
ASRTSYNTAX (2 == scm_ilength (arg1), scm_s_bindings);
ASRTSYNTAX (SCM_NIMP (SCM_CAR (arg1)) && SCM_SYMBOLP (SCM_CAR (arg1)),
scm_s_variable);
vars = scm_cons (SCM_CAR (arg1), vars);
*initloc = scm_cons (SCM_CAR (SCM_CDR (arg1)), SCM_EOL);
initloc = SCM_CDRLOC (*initloc);
}
while (SCM_NIMP (proc = SCM_CDR (proc)));
return scm_cons2 (op, vars,
scm_cons (inits, scm_m_body (imm, SCM_CDR (x), what)));
}
SCM_SYNTAX(s_letrec, "letrec", scm_makmmacro, scm_m_letrec);
SCM_GLOBAL_SYMBOL(scm_sym_letrec, s_letrec);
SCM
scm_m_letrec (xorig, env)
SCM xorig;
SCM env;
{
SCM x = SCM_CDR (xorig);
SCM_ASSYNT (scm_ilength (x) >= 2, xorig, scm_s_body, s_letrec);
if (SCM_NULLP (SCM_CAR (x))) /* null binding, let* faster */
return scm_m_letstar (scm_cons2 (SCM_CAR (xorig), SCM_EOL,
scm_m_body (SCM_IM_LETREC,
SCM_CDR (x),
s_letrec)),
env);
else
return scm_m_letrec1 (SCM_IM_LETREC, SCM_IM_LETREC, xorig, env);
}
SCM_SYNTAX(s_let, "let", scm_makmmacro, scm_m_let);
SCM_GLOBAL_SYMBOL(scm_sym_let, s_let);
SCM
scm_m_let (xorig, env)
SCM xorig;
SCM env;
{
SCM cdrx = SCM_CDR (xorig); /* locally mutable version of form */
SCM x = cdrx, proc, arg1, name; /* structure traversers */
SCM vars = SCM_EOL, inits = SCM_EOL, *varloc = &vars, *initloc = &inits;
SCM_ASSYNT (scm_ilength (x) >= 2, xorig, scm_s_body, s_let);
proc = SCM_CAR (x);
if (SCM_NULLP (proc)
|| (SCM_NIMP (proc) && SCM_CONSP (proc)
&& SCM_NIMP (SCM_CAR (proc))
&& SCM_CONSP (SCM_CAR (proc)) && SCM_NULLP (SCM_CDR (proc))))
{
/* null or single binding, let* is faster */
return scm_m_letstar (scm_cons2 (SCM_CAR (xorig), proc,
scm_m_body (SCM_IM_LET,
SCM_CDR (x),
s_let)),
env);
}
SCM_ASSYNT (SCM_NIMP (proc), xorig, scm_s_bindings, s_let);
if (SCM_CONSP (proc))
{
/* plain let, proc is <bindings> */
return scm_m_letrec1 (SCM_IM_LET, SCM_IM_LET, xorig, env);
}
if (!SCM_SYMBOLP (proc))
scm_wta (xorig, scm_s_bindings, s_let); /* bad let */
name = proc; /* named let, build equiv letrec */
x = SCM_CDR (x);
SCM_ASSYNT (scm_ilength (x) >= 2, xorig, scm_s_body, s_let);
proc = SCM_CAR (x); /* bindings list */
SCM_ASSYNT (scm_ilength (proc) >= 0, xorig, scm_s_bindings, s_let);
while (SCM_NIMP (proc))
{ /* vars and inits both in order */
arg1 = SCM_CAR (proc);
SCM_ASSYNT (2 == scm_ilength (arg1), xorig, scm_s_bindings, s_let);
SCM_ASSYNT (SCM_NIMP (SCM_CAR (arg1)) && SCM_SYMBOLP (SCM_CAR (arg1)),
xorig, scm_s_variable, s_let);
*varloc = scm_cons (SCM_CAR (arg1), SCM_EOL);
varloc = SCM_CDRLOC (*varloc);
*initloc = scm_cons (SCM_CAR (SCM_CDR (arg1)), SCM_EOL);
initloc = SCM_CDRLOC (*initloc);
proc = SCM_CDR (proc);
}
proc = scm_cons2 (scm_sym_lambda, vars,
scm_m_body (SCM_IM_LET, SCM_CDR (x), "let"));
proc = scm_cons2 (scm_sym_let, scm_cons (scm_cons2 (name, proc, SCM_EOL),
SCM_EOL),
scm_acons (name, inits, SCM_EOL));
return scm_m_letrec1 (SCM_IM_LETREC, SCM_IM_LET, proc, env);
}
SCM_SYNTAX (s_atapply,"@apply", scm_makmmacro, scm_m_apply);
SCM_GLOBAL_SYMBOL (scm_sym_atapply, s_atapply);
SCM_GLOBAL_SYMBOL (scm_sym_apply, s_atapply + 1);
SCM
scm_m_apply (xorig, env)
SCM xorig;
SCM env;
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2,
xorig, scm_s_expression, s_atapply);
return scm_cons (SCM_IM_APPLY, SCM_CDR (xorig));
}
SCM_SYNTAX(s_atcall_cc,"@call-with-current-continuation", scm_makmmacro, scm_m_cont);
SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc,s_atcall_cc);
SCM
scm_m_cont (xorig, env)
SCM xorig;
SCM env;
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
xorig, scm_s_expression, s_atcall_cc);
return scm_cons (SCM_IM_CONT, SCM_CDR (xorig));
}
/* Multi-language support */
SCM scm_nil;
SCM scm_t;
SCM_SYNTAX (s_nil_cond, "nil-cond", scm_makmmacro, scm_m_nil_cond);
SCM
scm_m_nil_cond (SCM xorig, SCM env)
{
int len = scm_ilength (SCM_CDR (xorig));
SCM_ASSYNT (len >= 1 && (len & 1) == 1, xorig,
scm_s_expression, "nil-cond");
return scm_cons (SCM_IM_NIL_COND, SCM_CDR (xorig));
}
SCM_SYNTAX (s_nil_ify, "nil-ify", scm_makmmacro, scm_m_nil_ify);
SCM
scm_m_nil_ify (SCM xorig, SCM env)
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
xorig, scm_s_expression, "nil-ify");
return scm_cons (SCM_IM_NIL_IFY, SCM_CDR (xorig));
}
SCM_SYNTAX (s_t_ify, "t-ify", scm_makmmacro, scm_m_t_ify);
SCM
scm_m_t_ify (SCM xorig, SCM env)
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
xorig, scm_s_expression, "t-ify");
return scm_cons (SCM_IM_T_IFY, SCM_CDR (xorig));
}
SCM_SYNTAX (s_0_cond, "0-cond", scm_makmmacro, scm_m_0_cond);
SCM
scm_m_0_cond (SCM xorig, SCM env)
{
int len = scm_ilength (SCM_CDR (xorig));
SCM_ASSYNT (len >= 1 && (len & 1) == 1, xorig,
scm_s_expression, "0-cond");
return scm_cons (SCM_IM_0_COND, SCM_CDR (xorig));
}
SCM_SYNTAX (s_0_ify, "0-ify", scm_makmmacro, scm_m_0_ify);
SCM
scm_m_0_ify (SCM xorig, SCM env)
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
xorig, scm_s_expression, "0-ify");
return scm_cons (SCM_IM_0_IFY, SCM_CDR (xorig));
}
SCM_SYNTAX (s_1_ify, "1-ify", scm_makmmacro, scm_m_1_ify);
SCM
scm_m_1_ify (SCM xorig, SCM env)
{
SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
xorig, scm_s_expression, "1-ify");
return scm_cons (SCM_IM_1_IFY, SCM_CDR (xorig));
}
SCM_SYNTAX (s_atfop, "@fop", scm_makmmacro, scm_m_atfop);
SCM
scm_m_atfop (SCM xorig, SCM env)
{
SCM x = SCM_CDR (xorig), vcell;
SCM_ASSYNT (scm_ilength (x) >= 1, xorig, scm_s_expression, "@fop");
vcell = scm_symbol_fref (SCM_CAR (x));
SCM_ASSYNT (SCM_NIMP (vcell) && SCM_CONSP (vcell), x,
"Symbol's function definition is void", NULL);
SCM_SETCAR (x, vcell + 1);
return x;
}
SCM_SYNTAX (s_atbind, "@bind", scm_makmmacro, scm_m_atbind);
SCM
scm_m_atbind (SCM xorig, SCM env)
{
SCM x = SCM_CDR (xorig);
SCM_ASSYNT (scm_ilength (x) > 1, xorig, scm_s_expression, "@bind");
if (SCM_IMP (env))
env = SCM_BOOL_F;
else
{
while (SCM_NIMP (SCM_CDR (env)))
env = SCM_CDR (env);
env = SCM_CAR (env);
if (SCM_CONSP (env))
env = SCM_BOOL_F;
}
x = SCM_CAR (x);
while (SCM_NIMP (x))
{
SCM_SETCAR (x, scm_sym2vcell (SCM_CAR (x), env, SCM_BOOL_T) + 1);
x = SCM_CDR (x);
}
return scm_cons (SCM_IM_BIND, SCM_CDR (xorig));
}
SCM
scm_m_expand_body (SCM xorig, SCM env)
{
SCM form, x = SCM_CDR (xorig), defs = SCM_EOL;
char *what = SCM_ISYMCHARS (SCM_CAR (xorig)) + 2;
while (SCM_NIMP (x))
{
form = SCM_CAR (x);
if (SCM_IMP (form) || SCM_NCONSP (form))
break;
if (SCM_IMP (SCM_CAR (form)))
break;
if (!SCM_SYMBOLP (SCM_CAR (form)))
break;
form = scm_macroexp (scm_cons_source (form,
SCM_CAR (form),
SCM_CDR (form)),
env);
if (SCM_IM_DEFINE == SCM_CAR (form))
{
defs = scm_cons (SCM_CDR (form), defs);
x = SCM_CDR(x);
}
else if (SCM_NIMP(defs))
{
break;
}
else if (SCM_IM_BEGIN == SCM_CAR (form))
{
x = scm_append (scm_cons2 (SCM_CDR (form), SCM_CDR (x), SCM_EOL));
}
else
{
x = scm_cons (form, SCM_CDR(x));
break;
}
}
SCM_ASSYNT (SCM_NIMP (x), SCM_CDR (xorig), scm_s_body, what);
if (SCM_NIMP (defs))
{
x = scm_cons (scm_m_letrec1 (SCM_IM_LETREC,
SCM_IM_DEFINE,
scm_cons2 (scm_sym_define, defs, x),
env),
SCM_EOL);
}
SCM_DEFER_INTS;
SCM_SETCAR (xorig, SCM_CAR (x));
SCM_SETCDR (xorig, SCM_CDR (x));
SCM_ALLOW_INTS;
return xorig;
}
SCM
scm_macroexp (SCM x, SCM env)
{
SCM res, proc;
/* Don't bother to produce error messages here. We get them when we
eventually execute the code for real. */
macro_tail:
if (SCM_IMP (SCM_CAR (x)) || !SCM_SYMBOLP (SCM_CAR (x)))
return x;
#ifdef USE_THREADS
{
SCM *proc_ptr = scm_lookupcar1 (x, env, 0);
if (proc_ptr == NULL)
{
/* We have lost the race. */
goto macro_tail;
}
proc = *proc_ptr;
}
#else
proc = *scm_lookupcar (x, env, 0);
#endif
/* Only handle memoizing macros. `Acros' and `macros' are really
special forms and should not be evaluated here. */
if (SCM_IMP (proc)
|| scm_tc16_macro != SCM_TYP16 (proc)
|| (int) (SCM_CAR (proc) >> 16) != 2)
return x;
unmemocar (x, env);
res = scm_apply (SCM_CDR (proc), x, scm_cons (env, scm_listofnull));
if (scm_ilength (res) <= 0)
res = scm_cons2 (SCM_IM_BEGIN, res, SCM_EOL);
SCM_DEFER_INTS;
SCM_SETCAR (x, SCM_CAR (res));
SCM_SETCDR (x, SCM_CDR (res));
SCM_ALLOW_INTS;
goto macro_tail;
}
/* scm_unmemocopy takes a memoized expression together with its
* environment and rewrites it to its original form. Thus, it is the
* inversion of the rewrite rules above. The procedure is not
* optimized for speed. It's used in scm_iprin1 when printing the
* code of a closure, in scm_procedure_source, in display_frame when
* generating the source for a stackframe in a backtrace, and in
* display_expression.
*/
/* We should introduce an anti-macro interface so that it is possible
* to plug in transformers in both directions from other compilation
* units. unmemocopy could then dispatch to anti-macro transformers.
* (Those transformers could perhaps be written in slightly more
* readable style... :)
*/
static SCM unmemocopy SCM_P ((SCM x, SCM env));
static SCM
unmemocopy (x, env)
SCM x;
SCM env;
{
SCM ls, z;
#ifdef DEBUG_EXTENSIONS
SCM p;
#endif
if (SCM_NCELLP (x) || SCM_NECONSP (x))
return x;
#ifdef DEBUG_EXTENSIONS
p = scm_whash_lookup (scm_source_whash, x);
#endif
switch (SCM_TYP7 (x))
{
case (127 & SCM_IM_AND):
ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_BEGIN):
ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_CASE):
ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_COND):
ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_DO):
ls = scm_cons (scm_sym_do, SCM_UNSPECIFIED);
goto transform;
case (127 & SCM_IM_IF):
ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_LET):
ls = scm_cons (scm_sym_let, SCM_UNSPECIFIED);
goto transform;
case (127 & SCM_IM_LETREC):
{
SCM f, v, e, s;
ls = scm_cons (scm_sym_letrec, SCM_UNSPECIFIED);
transform:
x = SCM_CDR (x);
/* binding names */
f = v = SCM_CAR (x);
x = SCM_CDR (x);
z = EXTEND_ENV (f, SCM_EOL, env);
/* inits */
e = scm_reverse (unmemocopy (SCM_CAR (x),
SCM_CAR (ls) == scm_sym_letrec ? z : env));
env = z;
/* increments */
s = SCM_CAR (ls) == scm_sym_do
? scm_reverse (unmemocopy (SCM_CDR (SCM_CDR (SCM_CDR (x))), env))
: f;
/* build transformed binding list */
z = SCM_EOL;
do
{
z = scm_acons (SCM_CAR (v),
scm_cons (SCM_CAR (e),
SCM_CAR (s) == SCM_CAR (v)
? SCM_EOL
: scm_cons (SCM_CAR (s), SCM_EOL)),
z);
v = SCM_CDR (v);
e = SCM_CDR (e);
s = SCM_CDR (s);
}
while (SCM_NIMP (v));
z = scm_cons (z, SCM_UNSPECIFIED);
SCM_SETCDR (ls, z);
if (SCM_CAR (ls) == scm_sym_do)
{
x = SCM_CDR (x);
/* test clause */
SCM_SETCDR (z, scm_cons (unmemocopy (SCM_CAR (x), env),
SCM_UNSPECIFIED));
z = SCM_CDR (z);
x = (SCM) (SCM_CARLOC (SCM_CDR (x)) - 1);
/* body forms are now to be found in SCM_CDR (x)
(this is how *real* code look like! :) */
}
break;
}
case (127 & SCM_IM_LETSTAR):
{
SCM b, y;
x = SCM_CDR (x);
b = SCM_CAR (x);
y = SCM_EOL;
if SCM_IMP (b)
{
env = EXTEND_ENV (SCM_EOL, SCM_EOL, env);
goto letstar;
}
y = z = scm_acons (SCM_CAR (b),
unmemocar (
scm_cons (unmemocopy (SCM_CAR (SCM_CDR (b)), env), SCM_EOL), env),
SCM_UNSPECIFIED);
env = EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env);
b = SCM_CDR (SCM_CDR (b));
if (SCM_IMP (b))
{
SCM_SETCDR (y, SCM_EOL);
ls = scm_cons (scm_sym_let, z = scm_cons (y, SCM_UNSPECIFIED));
break;
}
do
{
SCM_SETCDR (z, scm_acons (SCM_CAR (b),
unmemocar (
scm_cons (unmemocopy (SCM_CAR (SCM_CDR (b)), env), SCM_EOL), env),
SCM_UNSPECIFIED));
z = SCM_CDR (z);
env = EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env);
b = SCM_CDR (SCM_CDR (b));
}
while (SCM_NIMP (b));
SCM_SETCDR (z, SCM_EOL);
letstar:
ls = scm_cons (scm_sym_letstar, z = scm_cons (y, SCM_UNSPECIFIED));
break;
}
case (127 & SCM_IM_OR):
ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_LAMBDA):
x = SCM_CDR (x);
ls = scm_cons (scm_sym_lambda,
z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED));
env = EXTEND_ENV (SCM_CAR (x), SCM_EOL, env);
break;
case (127 & SCM_IM_QUOTE):
ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_SET_X):
ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED);
break;
case (127 & SCM_IM_DEFINE):
{
SCM n;
x = SCM_CDR (x);
ls = scm_cons (scm_sym_define,
z = scm_cons (n = SCM_CAR (x), SCM_UNSPECIFIED));
if (SCM_NNULLP (env))
SCM_SETCAR (SCM_CAR (env), scm_cons (n, SCM_CAR (SCM_CAR (env))));
break;
}
case (127 & SCM_MAKISYM (0)):
z = SCM_CAR (x);
if (!SCM_ISYMP (z))
goto unmemo;
switch (SCM_ISYMNUM (z))
{
case (SCM_ISYMNUM (SCM_IM_APPLY)):
ls = z = scm_cons (scm_sym_atapply, SCM_UNSPECIFIED);
goto loop;
case (SCM_ISYMNUM (SCM_IM_CONT)):
ls = z = scm_cons (scm_sym_atcall_cc, SCM_UNSPECIFIED);
goto loop;
case (SCM_ISYMNUM (SCM_IM_DELAY)):
ls = z = scm_cons (scm_sym_delay, SCM_UNSPECIFIED);
x = SCM_CDR (x);
goto loop;
default:
/* appease the Sun compiler god: */ ;
}
unmemo:
default:
ls = z = unmemocar (scm_cons (unmemocopy (SCM_CAR (x), env),
SCM_UNSPECIFIED),
env);
}
loop:
while (SCM_CELLP (x = SCM_CDR (x)) && SCM_ECONSP (x))
{
if (SCM_IMP (SCM_CAR (x)) && SCM_ISYMP (SCM_CAR (x)))
/* skip body markers */
continue;
SCM_SETCDR (z, unmemocar (scm_cons (unmemocopy (SCM_CAR (x), env),
SCM_UNSPECIFIED),
env));
z = SCM_CDR (z);
}
SCM_SETCDR (z, x);
#ifdef DEBUG_EXTENSIONS
if (SCM_NFALSEP (p))
scm_whash_insert (scm_source_whash, ls, p);
#endif
return ls;
}
SCM
scm_unmemocopy (x, env)
SCM x;
SCM env;
{
if (SCM_NNULLP (env))
/* Make a copy of the lowest frame to protect it from
modifications by SCM_IM_DEFINE */
return unmemocopy (x, scm_cons (SCM_CAR (env), SCM_CDR (env)));
else
return unmemocopy (x, env);
}
#ifndef SCM_RECKLESS
int
scm_badargsp (formals, args)
SCM formals;
SCM args;
{
while (SCM_NIMP (formals))
{
if (SCM_NCONSP (formals))
return 0;
if (SCM_IMP(args))
return 1;
formals = SCM_CDR (formals);
args = SCM_CDR (args);
}
return SCM_NNULLP (args) ? 1 : 0;
}
#endif
SCM
scm_eval_args (l, env, proc)
SCM l;
SCM env;
SCM proc;
{
SCM results = SCM_EOL, *lloc = &results, res;
while (SCM_NIMP (l))
{
#ifdef SCM_CAUTIOUS
if (SCM_IMP (l))
goto wrongnumargs;
else if (SCM_CONSP (l))
{
if (SCM_IMP (SCM_CAR (l)))
res = SCM_EVALIM (SCM_CAR (l), env);
else
res = EVALCELLCAR (l, env);
}
else if (SCM_TYP3 (l) == 1)
{
if ((res = SCM_GLOC_VAL (SCM_CAR (l))) == 0)
res = SCM_CAR (l); /* struct planted in code */
}
else
goto wrongnumargs;
#else
res = EVALCAR (l, env);
#endif
*lloc = scm_cons (res, SCM_EOL);
lloc = SCM_CDRLOC (*lloc);
l = SCM_CDR (l);
}
#ifdef SCM_CAUTIOUS
if (SCM_NNULLP (l))
{
wrongnumargs:
scm_wrong_num_args (proc);
}
#endif
return results;
}
SCM
scm_eval_body (SCM code, SCM env)
{
SCM next;
again:
next = code;
while (SCM_NNULLP (next = SCM_CDR (next)))
{
if (SCM_IMP (SCM_CAR (code)))
{
if (SCM_ISYMP (SCM_CAR (code)))
{
code = scm_m_expand_body (code, env);
goto again;
}
}
else
SCM_XEVAL (SCM_CAR (code), env);
code = next;
}
return SCM_XEVALCAR (code, env);
}
#endif /* !DEVAL */
/* SECTION: This code is specific for the debugging support. One
* branch is read when DEVAL isn't defined, the other when DEVAL is
* defined.
*/
#ifndef DEVAL
#define SCM_APPLY scm_apply
#define PREP_APPLY(proc, args)
#define ENTER_APPLY
#define RETURN(x) return x;
#ifdef STACK_CHECKING
#ifndef NO_CEVAL_STACK_CHECKING
#define EVAL_STACK_CHECKING
#endif
#endif
#else /* !DEVAL */
#undef SCM_CEVAL
#define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */
#undef SCM_APPLY
#define SCM_APPLY scm_dapply
#undef PREP_APPLY
#define PREP_APPLY(p, l) \
{ ++debug.info; debug.info->a.proc = p; debug.info->a.args = l; }
#undef ENTER_APPLY
#define ENTER_APPLY \
{\
SCM_SET_ARGSREADY (debug);\
if (CHECK_APPLY && SCM_TRAPS_P)\
if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\
{\
SCM tmp, tail = SCM_TRACED_FRAME_P (debug) ? SCM_BOOL_T : SCM_BOOL_F;\
SCM_SET_TRACED_FRAME (debug); \
if (SCM_CHEAPTRAPS_P)\
{\
tmp = scm_make_debugobj (&debug);\
scm_ithrow (scm_sym_apply_frame, scm_cons2 (tmp, tail, SCM_EOL), 0);\
}\
else\
{\
scm_make_cont (&tmp);\
if (!setjmp (SCM_JMPBUF (tmp)))\
scm_ithrow (scm_sym_apply_frame, scm_cons2 (tmp, tail, SCM_EOL), 0);\
}\
}\
}
#undef RETURN
#define RETURN(e) {proc = (e); goto exit;}
#ifdef STACK_CHECKING
#ifndef EVAL_STACK_CHECKING
#define EVAL_STACK_CHECKING
#endif
#endif
/* scm_ceval_ptr points to the currently selected evaluator.
* *fixme*: Although efficiency is important here, this state variable
* should probably not be a global. It should be related to the
* current repl.
*/
SCM (*scm_ceval_ptr) SCM_P ((SCM x, SCM env));
/* scm_last_debug_frame contains a pointer to the last debugging
* information stack frame. It is accessed very often from the
* debugging evaluator, so it should probably not be indirectly
* addressed. Better to save and restore it from the current root at
* any stack swaps.
*/
#ifndef USE_THREADS
scm_debug_frame *scm_last_debug_frame;
#endif
/* scm_debug_eframe_size is the number of slots available for pseudo
* stack frames at each real stack frame.
*/
int scm_debug_eframe_size;
int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p;
int scm_eval_stack;
scm_option scm_eval_opts[] = {
{ SCM_OPTION_INTEGER, "stack", 22000, "Size of thread stacks (in machine words)." }
};
scm_option scm_debug_opts[] = {
{ SCM_OPTION_BOOLEAN, "cheap", 1,
"*Flyweight representation of the stack at traps." },
{ SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." },
{ SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." },
{ SCM_OPTION_BOOLEAN, "procnames", 1,
"Record procedure names at definition." },
{ SCM_OPTION_BOOLEAN, "backwards", 0,
"Display backtrace in anti-chronological order." },
{ SCM_OPTION_INTEGER, "width", 79, "Maximal width of backtrace." },
{ SCM_OPTION_INTEGER, "indent", 10, "Maximal indentation in backtrace." },
{ SCM_OPTION_INTEGER, "frames", 3,
"Maximum number of tail-recursive frames in backtrace." },
{ SCM_OPTION_INTEGER, "maxdepth", 1000,
"Maximal number of stored backtrace frames." },
{ SCM_OPTION_INTEGER, "depth", 20, "Maximal length of printed backtrace." },
{ SCM_OPTION_BOOLEAN, "backtrace", 0, "Show backtrace on error." },
{ SCM_OPTION_BOOLEAN, "debug", 0, "Use the debugging evaluator." },
{ SCM_OPTION_INTEGER, "stack", 20000, "Stack size limit (measured in words; 0 = no check)." }
};
scm_option scm_evaluator_trap_table[] = {
{ SCM_OPTION_BOOLEAN, "traps", 0, "Enable evaluator traps." },
{ SCM_OPTION_BOOLEAN, "enter-frame", 0, "Trap when eval enters new frame." },
{ SCM_OPTION_BOOLEAN, "apply-frame", 0, "Trap when entering apply." },
{ SCM_OPTION_BOOLEAN, "exit-frame", 0, "Trap when exiting eval or apply." }
};
SCM_PROC (s_eval_options_interface, "eval-options-interface", 0, 1, 0, scm_eval_options_interface);
SCM
scm_eval_options_interface (SCM setting)
{
SCM ans;
SCM_DEFER_INTS;
ans = scm_options (setting,
scm_eval_opts,
SCM_N_EVAL_OPTIONS,
s_eval_options_interface);
scm_eval_stack = SCM_EVAL_STACK * sizeof (void *);
SCM_ALLOW_INTS;
return ans;
}
SCM_PROC (s_evaluator_traps, "evaluator-traps-interface", 0, 1, 0, scm_evaluator_traps);
SCM
scm_evaluator_traps (setting)
SCM setting;
{
SCM ans;
SCM_DEFER_INTS;
ans = scm_options (setting,
scm_evaluator_trap_table,
SCM_N_EVALUATOR_TRAPS,
s_evaluator_traps);
SCM_RESET_DEBUG_MODE;
SCM_ALLOW_INTS;
return ans;
}
SCM
scm_deval_args (l, env, proc, lloc)
SCM l, env, proc, *lloc;
{
SCM *results = lloc, res;
while (SCM_NIMP (l))
{
#ifdef SCM_CAUTIOUS
if (SCM_IMP (l))
goto wrongnumargs;
else if (SCM_CONSP (l))
{
if (SCM_IMP (SCM_CAR (l)))
res = SCM_EVALIM (SCM_CAR (l), env);
else
res = EVALCELLCAR (l, env);
}
else if (SCM_TYP3 (l) == 1)
{
if ((res = SCM_GLOC_VAL (SCM_CAR (l))) == 0)
res = SCM_CAR (l); /* struct planted in code */
}
else
goto wrongnumargs;
#else
res = EVALCAR (l, env);
#endif
*lloc = scm_cons (res, SCM_EOL);
lloc = SCM_CDRLOC (*lloc);
l = SCM_CDR (l);
}
#ifdef SCM_CAUTIOUS
if (SCM_NNULLP (l))
{
wrongnumargs:
scm_wrong_num_args (proc);
}
#endif
return *results;
}
#endif /* !DEVAL */
/* SECTION: Some local definitions for the evaluator.
*/
#ifndef DEVAL
#ifdef SCM_FLOATS
#define CHECK_EQVISH(A,B) (((A) == (B)) || (SCM_NFALSEP (scm_eqv_p ((A), (B)))))
#else
#define CHECK_EQVISH(A,B) ((A) == (B))
#endif
#endif /* DEVAL */
#define BUILTIN_RPASUBR /* Handle rpsubrs and asubrs without calling apply */
/* SECTION: This is the evaluator. Like any real monster, it has
* three heads. This code is compiled twice.
*/
#if 0
SCM
scm_ceval (x, env)
SCM x;
SCM env;
{}
#endif
#if 0
SCM
scm_deval (x, env)
SCM x;
SCM env;
{}
#endif
SCM
SCM_CEVAL (x, env)
SCM x;
SCM env;
{
union
{
SCM *lloc;
SCM arg1;
} t;
SCM proc, arg2;
#ifdef DEVAL
scm_debug_frame debug;
scm_debug_info *debug_info_end;
debug.prev = scm_last_debug_frame;
debug.status = scm_debug_eframe_size;
/*
* The debug.vect contains twice as much scm_debug_info frames as the
* user has specified with (debug-set! frames <n>).
*
* Even frames are eval frames, odd frames are apply frames.
*/
debug.vect = (scm_debug_info *) alloca (scm_debug_eframe_size
* sizeof (debug.vect[0]));
debug.info = debug.vect;
debug_info_end = debug.vect + scm_debug_eframe_size;
scm_last_debug_frame = &debug;
#endif
#ifdef EVAL_STACK_CHECKING
if (SCM_STACK_OVERFLOW_P ((SCM_STACKITEM *) &proc)
&& scm_stack_checking_enabled_p)
{
#ifdef DEVAL
debug.info->e.exp = x;
debug.info->e.env = env;
#endif
scm_report_stack_overflow ();
}
#endif
#ifdef DEVAL
goto start;
#endif
loopnoap:
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
loop:
#ifdef DEVAL
SCM_CLEAR_ARGSREADY (debug);
if (SCM_OVERFLOWP (debug))
--debug.info;
/*
* In theory, this should be the only place where it is necessary to
* check for space in debug.vect since both eval frames and
* available space are even.
*
* For this to be the case, however, it is necessary that primitive
* special forms which jump back to `loop', `begin' or some similar
* label call PREP_APPLY. A convenient way to do this is to jump to
* `loopnoap' or `cdrxnoap'.
*/
else if (++debug.info >= debug_info_end)
{
SCM_SET_OVERFLOW (debug);
debug.info -= 2;
}
start:
debug.info->e.exp = x;
debug.info->e.env = env;
if (CHECK_ENTRY && SCM_TRAPS_P)
if (SCM_ENTER_FRAME_P || (SCM_BREAKPOINTS_P && SRCBRKP (x)))
{
SCM tail = SCM_TAILRECP (debug) ? SCM_BOOL_T : SCM_BOOL_F;
SCM_SET_TAILREC (debug);
if (SCM_CHEAPTRAPS_P)
t.arg1 = scm_make_debugobj (&debug);
else
{
scm_make_cont (&t.arg1);
if (setjmp (SCM_JMPBUF (t.arg1)))
{
x = SCM_THROW_VALUE (t.arg1);
if (SCM_IMP (x))
{
RETURN (x);
}
else
/* This gives the possibility for the debugger to
modify the source expression before evaluation. */
goto dispatch;
}
}
scm_ithrow (scm_sym_enter_frame,
scm_cons2 (t.arg1, tail,
scm_cons (scm_unmemocopy (x, env), SCM_EOL)),
0);
}
#endif
#if defined (USE_THREADS) || defined (DEVAL)
dispatch:
#endif
SCM_TICK;
switch (SCM_TYP7 (x))
{
case scm_tcs_symbols:
/* Only happens when called at top level.
*/
x = scm_cons (x, SCM_UNDEFINED);
goto retval;
case (127 & SCM_IM_AND):
x = SCM_CDR (x);
t.arg1 = x;
while (SCM_NNULLP (t.arg1 = SCM_CDR (t.arg1)))
if (SCM_FALSEP (EVALCAR (x, env)))
{
RETURN (SCM_BOOL_F);
}
else
x = t.arg1;
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
case (127 & SCM_IM_BEGIN):
cdrxnoap:
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
cdrxbegin:
x = SCM_CDR (x);
begin:
t.arg1 = x;
while (SCM_NNULLP (t.arg1 = SCM_CDR (t.arg1)))
{
if (SCM_IMP (SCM_CAR (x)))
{
if (SCM_ISYMP (SCM_CAR (x)))
{
x = scm_m_expand_body (x, env);
goto begin;
}
}
else
SCM_CEVAL (SCM_CAR (x), env);
x = t.arg1;
}
carloop: /* scm_eval car of last form in list */
if (SCM_NCELLP (SCM_CAR (x)))
{
x = SCM_CAR (x);
RETURN (SCM_IMP (x) ? SCM_EVALIM (x, env) : SCM_GLOC_VAL (x))
}
if (SCM_SYMBOLP (SCM_CAR (x)))
{
retval:
RETURN (*scm_lookupcar (x, env, 1))
}
x = SCM_CAR (x);
goto loop; /* tail recurse */
case (127 & SCM_IM_CASE):
x = SCM_CDR (x);
t.arg1 = EVALCAR (x, env);
while (SCM_NIMP (x = SCM_CDR (x)))
{
proc = SCM_CAR (x);
if (scm_sym_else == SCM_CAR (proc))
{
x = SCM_CDR (proc);
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto begin;
}
proc = SCM_CAR (proc);
while (SCM_NIMP (proc))
{
if (CHECK_EQVISH (SCM_CAR (proc), t.arg1))
{
x = SCM_CDR (SCM_CAR (x));
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto begin;
}
proc = SCM_CDR (proc);
}
}
RETURN (SCM_UNSPECIFIED)
case (127 & SCM_IM_COND):
while (SCM_NIMP (x = SCM_CDR (x)))
{
proc = SCM_CAR (x);
t.arg1 = EVALCAR (proc, env);
if (SCM_NFALSEP (t.arg1))
{
x = SCM_CDR (proc);
if SCM_NULLP (x)
{
RETURN (t.arg1)
}
if (scm_sym_arrow != SCM_CAR (x))
{
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto begin;
}
proc = SCM_CDR (x);
proc = EVALCAR (proc, env);
SCM_ASRTGO (SCM_NIMP (proc), badfun);
PREP_APPLY (proc, scm_cons (t.arg1, SCM_EOL));
ENTER_APPLY;
goto evap1;
}
}
RETURN (SCM_UNSPECIFIED)
case (127 & SCM_IM_DO):
x = SCM_CDR (x);
proc = SCM_CAR (SCM_CDR (x)); /* inits */
t.arg1 = SCM_EOL; /* values */
while (SCM_NIMP (proc))
{
t.arg1 = scm_cons (EVALCAR (proc, env), t.arg1);
proc = SCM_CDR (proc);
}
env = EXTEND_ENV (SCM_CAR (x), t.arg1, env);
x = SCM_CDR (SCM_CDR (x));
while (proc = SCM_CAR (x), SCM_FALSEP (EVALCAR (proc, env)))
{
for (proc = SCM_CADR (x); SCM_NIMP (proc); proc = SCM_CDR (proc))
{
t.arg1 = SCM_CAR (proc); /* body */
SIDEVAL (t.arg1, env);
}
for (t.arg1 = SCM_EOL, proc = SCM_CDDR (x);
SCM_NIMP (proc);
proc = SCM_CDR (proc))
t.arg1 = scm_cons (EVALCAR (proc, env), t.arg1); /* steps */
env = EXTEND_ENV (SCM_CAR (SCM_CAR (env)), t.arg1, SCM_CDR (env));
}
x = SCM_CDR (proc);
if (SCM_NULLP (x))
RETURN (SCM_UNSPECIFIED);
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto begin;
case (127 & SCM_IM_IF):
x = SCM_CDR (x);
if (SCM_NFALSEP (EVALCAR (x, env)))
x = SCM_CDR (x);
else if (SCM_IMP (x = SCM_CDR (SCM_CDR (x))))
{
RETURN (SCM_UNSPECIFIED);
}
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
case (127 & SCM_IM_LET):
x = SCM_CDR (x);
proc = SCM_CAR (SCM_CDR (x));
t.arg1 = SCM_EOL;
do
{
t.arg1 = scm_cons (EVALCAR (proc, env), t.arg1);
}
while (SCM_NIMP (proc = SCM_CDR (proc)));
env = EXTEND_ENV (SCM_CAR (x), t.arg1, env);
x = SCM_CDR (x);
goto cdrxnoap;
case (127 & SCM_IM_LETREC):
x = SCM_CDR (x);
env = EXTEND_ENV (SCM_CAR (x), scm_undefineds, env);
x = SCM_CDR (x);
proc = SCM_CAR (x);
t.arg1 = SCM_EOL;
do
{
t.arg1 = scm_cons (EVALCAR (proc, env), t.arg1);
}
while (SCM_NIMP (proc = SCM_CDR (proc)));
SCM_SETCDR (SCM_CAR (env), t.arg1);
goto cdrxnoap;
case (127 & SCM_IM_LETSTAR):
x = SCM_CDR (x);
proc = SCM_CAR (x);
if (SCM_IMP (proc))
{
env = EXTEND_ENV (SCM_EOL, SCM_EOL, env);
goto cdrxnoap;
}
do
{
t.arg1 = SCM_CAR (proc);
proc = SCM_CDR (proc);
env = EXTEND_ENV (t.arg1, EVALCAR (proc, env), env);
}
while (SCM_NIMP (proc = SCM_CDR (proc)));
goto cdrxnoap;
case (127 & SCM_IM_OR):
x = SCM_CDR (x);
t.arg1 = x;
while (SCM_NNULLP (t.arg1 = SCM_CDR (t.arg1)))
{
x = EVALCAR (x, env);
if (SCM_NFALSEP (x))
{
RETURN (x);
}
x = t.arg1;
}
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
case (127 & SCM_IM_LAMBDA):
RETURN (scm_closure (SCM_CDR (x), env));
case (127 & SCM_IM_QUOTE):
RETURN (SCM_CAR (SCM_CDR (x)));
case (127 & SCM_IM_SET_X):
x = SCM_CDR (x);
proc = SCM_CAR (x);
switch (7 & (int) proc)
{
case 0:
t.lloc = scm_lookupcar (x, env, 1);
break;
case 1:
t.lloc = SCM_GLOC_VAL_LOC (proc);
break;
#ifdef MEMOIZE_LOCALS
case 4:
t.lloc = scm_ilookup (proc, env);
break;
#endif
}
x = SCM_CDR (x);
*t.lloc = EVALCAR (x, env);
#ifdef SICP
RETURN (*t.lloc);
#else
RETURN (SCM_UNSPECIFIED);
#endif
case (127 & SCM_IM_DEFINE): /* only for internal defines */
scm_misc_error (NULL, "Bad define placement", SCM_EOL);
/* new syntactic forms go here. */
case (127 & SCM_MAKISYM (0)):
proc = SCM_CAR (x);
SCM_ASRTGO (SCM_ISYMP (proc), badfun);
switch SCM_ISYMNUM (proc)
{
#if 0
case (SCM_ISYMNUM (IM_VREF)):
{
SCM var;
var = SCM_CAR (SCM_CDR (x));
RETURN (SCM_CDR(var));
}
case (SCM_ISYMNUM (IM_VSET)):
SCM_CDR (SCM_CAR ( SCM_CDR (x))) = EVALCAR( SCM_CDR ( SCM_CDR (x)), env);
SCM_CAR (SCM_CAR ( SCM_CDR (x))) = scm_tc16_variable;
RETURN (SCM_UNSPECIFIED)
#endif
case (SCM_ISYMNUM (SCM_IM_APPLY)):
proc = SCM_CDR (x);
proc = EVALCAR (proc, env);
SCM_ASRTGO (SCM_NIMP (proc), badfun);
if (SCM_CLOSUREP (proc))
{
SCM argl, tl;
PREP_APPLY (proc, SCM_EOL);
t.arg1 = SCM_CDR (SCM_CDR (x));
t.arg1 = EVALCAR (t.arg1, env);
#ifdef DEVAL
debug.info->a.args = t.arg1;
#endif
#ifndef SCM_RECKLESS
if (scm_badargsp (SCM_CAR (SCM_CODE (proc)), t.arg1))
goto wrongnumargs;
#endif
ENTER_APPLY;
/* Copy argument list */
if (SCM_IMP (t.arg1))
argl = t.arg1;
else
{
argl = tl = scm_cons (SCM_CAR (t.arg1), SCM_UNSPECIFIED);
while (SCM_NIMP (t.arg1 = SCM_CDR (t.arg1))
&& SCM_CONSP (t.arg1))
{
SCM_SETCDR (tl, scm_cons (SCM_CAR (t.arg1),
SCM_UNSPECIFIED));
tl = SCM_CDR (tl);
}
SCM_SETCDR (tl, t.arg1);
}
env = EXTEND_ENV (SCM_CAR (SCM_CODE (proc)), argl, SCM_ENV (proc));
x = SCM_CODE (proc);
goto cdrxbegin;
}
proc = scm_f_apply;
goto evapply;
case (SCM_ISYMNUM (SCM_IM_CONT)):
scm_make_cont (&t.arg1);
if (setjmp (SCM_JMPBUF (t.arg1)))
{
SCM val;
val = SCM_THROW_VALUE (t.arg1);
RETURN (val)
}
proc = SCM_CDR (x);
proc = evalcar (proc, env);
SCM_ASRTGO (SCM_NIMP (proc), badfun);
PREP_APPLY (proc, scm_cons (t.arg1, SCM_EOL));
ENTER_APPLY;
goto evap1;
case (SCM_ISYMNUM (SCM_IM_DELAY)):
RETURN (scm_makprom (scm_closure (SCM_CDR (x), env)))
case (SCM_ISYMNUM (SCM_IM_DISPATCH)):
proc = SCM_CADR (x); /* unevaluated operands */
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
if (SCM_IMP (proc))
arg2 = *scm_ilookup (proc, env);
else if (SCM_NCONSP (proc))
{
if (SCM_NCELLP (proc))
arg2 = SCM_GLOC_VAL (proc);
else
arg2 = *scm_lookupcar (SCM_CDR (x), env, 1);
}
else
{
arg2 = scm_cons (EVALCAR (proc, env), SCM_EOL);
t.lloc = SCM_CDRLOC (arg2);
while (SCM_NIMP (proc = SCM_CDR (proc)))
{
*t.lloc = scm_cons (EVALCAR (proc, env), SCM_EOL);
t.lloc = SCM_CDRLOC (*t.lloc);
}
}
type_dispatch:
/* The type dispatch code is duplicated here
* (c.f. objects.c:scm_mcache_compute_cmethod) since that
* cuts down execution time for type dispatch to 50%.
*/
{
int i, n, end, mask;
SCM z = SCM_CDDR (x);
n = SCM_INUM (SCM_CAR (z)); /* maximum number of specializers */
proc = SCM_CADR (z);
if (SCM_NIMP (proc))
{
/* Prepare for linear search */
mask = -1;
i = 0;
end = SCM_LENGTH (proc);
}
else
{
/* Compute a hash value */
int hashset = SCM_INUM (proc);
int j = n;
mask = SCM_INUM (SCM_CAR (z = SCM_CDDR (z)));
proc = SCM_CADR (z);
i = 0;
t.arg1 = arg2;
if (SCM_NIMP (t.arg1))
do
{
i += (SCM_STRUCT_DATA (scm_class_of (SCM_CAR (t.arg1)))
[scm_si_hashsets + hashset]);
t.arg1 = SCM_CDR (t.arg1);
}
while (--j && SCM_NIMP (t.arg1));
i &= mask;
end = i;
}
/* Search for match */
do
{
int j = n;
z = SCM_VELTS (proc)[i];
t.arg1 = arg2; /* list of arguments */
if (SCM_NIMP (t.arg1))
do
{
/* More arguments than specifiers => CLASS != ENV */
if (scm_class_of (SCM_CAR (t.arg1)) != SCM_CAR (z))
goto next_method;
t.arg1 = SCM_CDR (t.arg1);
z = SCM_CDR (z);
}
while (--j && SCM_NIMP (t.arg1));
/* Fewer arguments than specifiers => CAR != ENV */
if (!(SCM_IMP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z))))
goto next_method;
apply_cmethod:
env = EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (z)),
arg2,
SCM_CMETHOD_ENV (z));
x = SCM_CMETHOD_CODE (z);
goto cdrxbegin;
next_method:
i = (i + 1) & mask;
} while (i != end);
z = scm_memoize_method (x, arg2);
goto apply_cmethod;
}
case (SCM_ISYMNUM (SCM_IM_SLOT_REF)):
x = SCM_CDR (x);
t.arg1 = EVALCAR (x, env);
RETURN (SCM_STRUCT_DATA (t.arg1)[SCM_INUM (SCM_CADR (x))]);
case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)):
x = SCM_CDR (x);
t.arg1 = EVALCAR (x, env);
x = SCM_CDR (x);
proc = SCM_CDR (x);
SCM_STRUCT_DATA (t.arg1)[SCM_INUM (SCM_CAR (x))]
= EVALCAR (proc, env);
RETURN (SCM_UNSPECIFIED);
case (SCM_ISYMNUM (SCM_IM_NIL_COND)):
proc = SCM_CDR (x);
while (SCM_NIMP (x = SCM_CDR (proc)))
{
if (!(SCM_FALSEP (t.arg1 = EVALCAR (proc, env))
|| t.arg1 == scm_nil))
{
if (SCM_CAR (x) == SCM_UNSPECIFIED)
RETURN (t.arg1);
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
}
proc = SCM_CDR (x);
}
x = proc;
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
case (SCM_ISYMNUM (SCM_IM_NIL_IFY)):
x = SCM_CDR (x);
RETURN ((SCM_FALSEP (proc = EVALCAR (x, env)) || SCM_NULLP (proc))
? scm_nil
: proc)
case (SCM_ISYMNUM (SCM_IM_T_IFY)):
x = SCM_CDR (x);
RETURN (SCM_NFALSEP (EVALCAR (x, env)) ? scm_t : scm_nil)
case (SCM_ISYMNUM (SCM_IM_0_COND)):
proc = SCM_CDR (x);
while (SCM_NIMP (x = SCM_CDR (proc)))
{
if (!(SCM_FALSEP (t.arg1 = EVALCAR (proc, env))
|| t.arg1 == SCM_INUM0))
{
if (SCM_CAR (x) == SCM_UNSPECIFIED)
RETURN (t.arg1);
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
}
proc = SCM_CDR (x);
}
x = proc;
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
case (SCM_ISYMNUM (SCM_IM_0_IFY)):
x = SCM_CDR (x);
RETURN (SCM_FALSEP (proc = EVALCAR (x, env))
? SCM_INUM0
: proc)
case (SCM_ISYMNUM (SCM_IM_1_IFY)):
x = SCM_CDR (x);
RETURN (SCM_NFALSEP (EVALCAR (x, env))
? SCM_MAKINUM (1)
: SCM_INUM0)
case (SCM_ISYMNUM (SCM_IM_BIND)):
x = SCM_CDR (x);
t.arg1 = SCM_CAR (x);
arg2 = SCM_CDAR (env);
while (SCM_NIMP (arg2))
{
proc = SCM_GLOC_VAL (SCM_CAR (t.arg1));
SCM_SETCDR (SCM_CAR (t.arg1) - 1L, SCM_CAR (arg2));
SCM_SETCAR (arg2, proc);
t.arg1 = SCM_CDR (t.arg1);
arg2 = SCM_CDR (arg2);
}
t.arg1 = SCM_CAR (x);
scm_dynwinds = scm_acons (t.arg1, SCM_CDAR (env), scm_dynwinds);
arg2 = x = SCM_CDR (x);
while (SCM_NNULLP (arg2 = SCM_CDR (arg2)))
{
SIDEVAL (SCM_CAR (x), env);
x = arg2;
}
proc = EVALCAR (x, env);
scm_dynwinds = SCM_CDR (scm_dynwinds);
arg2 = SCM_CDAR (env);
while (SCM_NIMP (arg2))
{
SCM_SETCDR (SCM_CAR (t.arg1) - 1L, SCM_CAR (arg2));
t.arg1 = SCM_CDR (t.arg1);
arg2 = SCM_CDR (arg2);
}
RETURN (proc)
default:
goto badfun;
}
default:
proc = x;
badfun:
/* scm_everr (x, env,...) */
scm_misc_error (NULL,
"Wrong type to apply: %S",
scm_listify (proc, SCM_UNDEFINED));
case scm_tc7_vector:
case scm_tc7_wvect:
#ifdef HAVE_ARRAYS
case scm_tc7_bvect:
case scm_tc7_byvect:
case scm_tc7_svect:
case scm_tc7_ivect:
case scm_tc7_uvect:
case scm_tc7_fvect:
case scm_tc7_dvect:
case scm_tc7_cvect:
#ifdef HAVE_LONG_LONGS
case scm_tc7_llvect:
#endif
#endif
case scm_tc7_string:
case scm_tc7_substring:
case scm_tc7_smob:
case scm_tcs_closures:
#ifdef CCLO
case scm_tc7_cclo:
#endif
case scm_tc7_pws:
case scm_tcs_subrs:
RETURN (x);
#ifdef MEMOIZE_LOCALS
case (127 & SCM_ILOC00):
proc = *scm_ilookup (SCM_CAR (x), env);
SCM_ASRTGO (SCM_NIMP (proc), badfun);
#ifndef SCM_RECKLESS
#ifdef SCM_CAUTIOUS
goto checkargs;
#endif
#endif
break;
#endif /* ifdef MEMOIZE_LOCALS */
case scm_tcs_cons_gloc:
proc = SCM_GLOC_VAL (SCM_CAR (x));
if (proc == 0)
/* This is a struct implanted in the code, not a gloc. */
RETURN (x);
SCM_ASRTGO (SCM_NIMP (proc), badfun);
#ifndef SCM_RECKLESS
#ifdef SCM_CAUTIOUS
goto checkargs;
#endif
#endif
break;
case scm_tcs_cons_nimcar:
if (SCM_SYMBOLP (SCM_CAR (x)))
{
#ifdef USE_THREADS
t.lloc = scm_lookupcar1 (x, env, 1);
if (t.lloc == NULL)
{
/* we have lost the race, start again. */
goto dispatch;
}
proc = *t.lloc;
#else
proc = *scm_lookupcar (x, env, 1);
#endif
if (SCM_IMP (proc))
{
unmemocar (x, env);
goto badfun;
}
if (scm_tc16_macro == SCM_TYP16 (proc))
{
unmemocar (x, env);
handle_a_macro:
#ifdef DEVAL
/* Set a flag during macro expansion so that macro
application frames can be deleted from the backtrace. */
SCM_SET_MACROEXP (debug);
#endif
t.arg1 = SCM_APPLY (SCM_CDR (proc), x,
scm_cons (env, scm_listofnull));
#ifdef DEVAL
SCM_CLEAR_MACROEXP (debug);
#endif
switch ((int) (SCM_CAR (proc) >> 16))
{
case 2:
if (scm_ilength (t.arg1) <= 0)
t.arg1 = scm_cons2 (SCM_IM_BEGIN, t.arg1, SCM_EOL);
#ifdef DEVAL
if (!SCM_CLOSUREP (SCM_CDR (proc)))
{
#if 0 /* Top-level defines doesn't very often occur in backtraces */
if (scm_m_define == SCM_SUBRF (SCM_CDR (proc)) && SCM_TOP_LEVEL (env))
/* Prevent memoizing result of define macro */
{
debug.info->e.exp = scm_cons (SCM_CAR (x), SCM_CDR (x));
scm_set_source_properties_x (debug.info->e.exp,
scm_source_properties (x));
}
#endif
SCM_DEFER_INTS;
SCM_SETCAR (x, SCM_CAR (t.arg1));
SCM_SETCDR (x, SCM_CDR (t.arg1));
SCM_ALLOW_INTS;
goto dispatch;
}
/* Prevent memoizing of debug info expression. */
debug.info->e.exp = scm_cons_source (debug.info->e.exp,
SCM_CAR (x),
SCM_CDR (x));
#endif
SCM_DEFER_INTS;
SCM_SETCAR (x, SCM_CAR (t.arg1));
SCM_SETCDR (x, SCM_CDR (t.arg1));
SCM_ALLOW_INTS;
goto loopnoap;
case 1:
if (SCM_NIMP (x = t.arg1))
goto loopnoap;
case 0:
RETURN (t.arg1);
}
}
}
else
proc = SCM_CEVAL (SCM_CAR (x), env);
SCM_ASRTGO (SCM_NIMP (proc), badfun);
#ifndef SCM_RECKLESS
#ifdef SCM_CAUTIOUS
checkargs:
#endif
if (SCM_CLOSUREP (proc))
{
arg2 = SCM_CAR (SCM_CODE (proc));
t.arg1 = SCM_CDR (x);
while (SCM_NIMP (arg2))
{
if (SCM_NCONSP (arg2))
goto evapply;
if (SCM_IMP (t.arg1))
goto umwrongnumargs;
arg2 = SCM_CDR (arg2);
t.arg1 = SCM_CDR (t.arg1);
}
if (SCM_NNULLP (t.arg1))
goto umwrongnumargs;
}
else if (scm_tc16_macro == SCM_TYP16 (proc))
goto handle_a_macro;
#endif
}
evapply:
PREP_APPLY (proc, SCM_EOL);
if (SCM_NULLP (SCM_CDR (x))) {
ENTER_APPLY;
evap0:
switch (SCM_TYP7 (proc))
{ /* no arguments given */
case scm_tc7_subr_0:
RETURN (SCM_SUBRF (proc) ());
case scm_tc7_subr_1o:
RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED));
case scm_tc7_lsubr:
RETURN (SCM_SUBRF (proc) (SCM_EOL));
case scm_tc7_rpsubr:
RETURN (SCM_BOOL_T);
case scm_tc7_asubr:
RETURN (SCM_SUBRF (proc) (SCM_UNDEFINED, SCM_UNDEFINED));
#ifdef CCLO
case scm_tc7_cclo:
t.arg1 = proc;
proc = SCM_CCLO_SUBR (proc);
#ifdef DEVAL
debug.info->a.proc = proc;
debug.info->a.args = scm_cons (t.arg1, SCM_EOL);
#endif
goto evap1;
#endif
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
#ifdef DEVAL
debug.info->a.proc = proc;
#endif
goto evap0;
case scm_tcs_closures:
x = SCM_CODE (proc);
env = EXTEND_ENV (SCM_CAR (x), SCM_EOL, SCM_ENV (proc));
goto cdrxbegin;
case scm_tcs_cons_gloc:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
x = SCM_ENTITY_PROCEDURE (proc);
arg2 = SCM_EOL;
goto type_dispatch;
}
else if (!SCM_I_OPERATORP (proc))
goto badfun;
else
{
t.arg1 = proc;
proc = (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc));
#ifdef DEVAL
debug.info->a.proc = proc;
debug.info->a.args = scm_cons (t.arg1, SCM_EOL);
#endif
if (SCM_NIMP (proc))
goto evap1;
else
goto badfun;
}
case scm_tc7_contin:
case scm_tc7_subr_1:
case scm_tc7_subr_2:
case scm_tc7_subr_2o:
case scm_tc7_cxr:
case scm_tc7_subr_3:
case scm_tc7_lsubr_2:
umwrongnumargs:
unmemocar (x, env);
wrongnumargs:
/* scm_everr (x, env,...) */
scm_wrong_num_args (proc);
default:
/* handle macros here */
goto badfun;
}
}
/* must handle macros by here */
x = SCM_CDR (x);
#ifdef SCM_CAUTIOUS
if (SCM_IMP (x))
goto wrongnumargs;
else if (SCM_CONSP (x))
{
if (SCM_IMP (SCM_CAR (x)))
t.arg1 = SCM_EVALIM (SCM_CAR (x), env);
else
t.arg1 = EVALCELLCAR (x, env);
}
else if (SCM_TYP3 (x) == 1)
{
if ((t.arg1 = SCM_GLOC_VAL (SCM_CAR (x))) == 0)
t.arg1 = SCM_CAR (x); /* struct planted in code */
}
else
goto wrongnumargs;
#else
t.arg1 = EVALCAR (x, env);
#endif
#ifdef DEVAL
debug.info->a.args = scm_cons (t.arg1, SCM_EOL);
#endif
x = SCM_CDR (x);
if (SCM_NULLP (x))
{
ENTER_APPLY;
evap1:
switch (SCM_TYP7 (proc))
{ /* have one argument in t.arg1 */
case scm_tc7_subr_2o:
RETURN (SCM_SUBRF (proc) (t.arg1, SCM_UNDEFINED));
case scm_tc7_subr_1:
case scm_tc7_subr_1o:
RETURN (SCM_SUBRF (proc) (t.arg1));
case scm_tc7_cxr:
#ifdef SCM_FLOATS
if (SCM_SUBRF (proc))
{
if (SCM_INUMP (t.arg1))
{
RETURN (scm_makdbl (SCM_DSUBRF (proc) ((double) SCM_INUM (t.arg1)),
0.0));
}
SCM_ASRTGO (SCM_NIMP (t.arg1), floerr);
if (SCM_REALP (t.arg1))
{
RETURN (scm_makdbl (SCM_DSUBRF (proc) (SCM_REALPART (t.arg1)), 0.0));
}
#ifdef SCM_BIGDIG
if (SCM_BIGP (t.arg1))
{
RETURN (scm_makdbl (SCM_DSUBRF (proc) (scm_big2dbl (t.arg1)), 0.0));
}
#endif
floerr:
SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), t.arg1,
SCM_ARG1, SCM_CHARS (SCM_SNAME (proc)));
}
#endif
proc = (SCM) SCM_SNAME (proc);
{
char *chrs = SCM_CHARS (proc) + SCM_LENGTH (proc) - 1;
while ('c' != *--chrs)
{
SCM_ASSERT (SCM_NIMP (t.arg1) && SCM_CONSP (t.arg1),
t.arg1, SCM_ARG1, SCM_CHARS (proc));
t.arg1 = ('a' == *chrs) ? SCM_CAR (t.arg1) : SCM_CDR (t.arg1);
}
RETURN (t.arg1);
}
case scm_tc7_rpsubr:
RETURN (SCM_BOOL_T);
case scm_tc7_asubr:
RETURN (SCM_SUBRF (proc) (t.arg1, SCM_UNDEFINED));
case scm_tc7_lsubr:
#ifdef DEVAL
RETURN (SCM_SUBRF (proc) (debug.info->a.args))
#else
RETURN (SCM_SUBRF (proc) (scm_cons (t.arg1, SCM_EOL)));
#endif
#ifdef CCLO
case scm_tc7_cclo:
arg2 = t.arg1;
t.arg1 = proc;
proc = SCM_CCLO_SUBR (proc);
#ifdef DEVAL
debug.info->a.args = scm_cons (t.arg1, debug.info->a.args);
debug.info->a.proc = proc;
#endif
goto evap2;
#endif
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
#ifdef DEVAL
debug.info->a.proc = proc;
#endif
goto evap1;
case scm_tcs_closures:
/* clos1: */
x = SCM_CODE (proc);
#ifdef DEVAL
env = EXTEND_ENV (SCM_CAR (x), debug.info->a.args, SCM_ENV (proc));
#else
env = EXTEND_ENV (SCM_CAR (x), scm_cons (t.arg1, SCM_EOL), SCM_ENV (proc));
#endif
goto cdrxbegin;
case scm_tc7_contin:
scm_call_continuation (proc, t.arg1);
case scm_tcs_cons_gloc:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
x = SCM_ENTITY_PROCEDURE (proc);
#ifdef DEVAL
arg2 = debug.info->a.args;
#else
arg2 = scm_cons (t.arg1, SCM_EOL);
#endif
goto type_dispatch;
}
else if (!SCM_I_OPERATORP (proc))
goto badfun;
else
{
arg2 = t.arg1;
t.arg1 = proc;
proc = (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc));
#ifdef DEVAL
debug.info->a.args = scm_cons (t.arg1, debug.info->a.args);
debug.info->a.proc = proc;
#endif
if (SCM_NIMP (proc))
goto evap2;
else
goto badfun;
}
case scm_tc7_subr_2:
case scm_tc7_subr_0:
case scm_tc7_subr_3:
case scm_tc7_lsubr_2:
goto wrongnumargs;
default:
goto badfun;
}
}
#ifdef SCM_CAUTIOUS
if (SCM_IMP (x))
goto wrongnumargs;
else if (SCM_CONSP (x))
{
if (SCM_IMP (SCM_CAR (x)))
arg2 = SCM_EVALIM (SCM_CAR (x), env);
else
arg2 = EVALCELLCAR (x, env);
}
else if (SCM_TYP3 (x) == 1)
{
if ((arg2 = SCM_GLOC_VAL (SCM_CAR (x))) == 0)
arg2 = SCM_CAR (x); /* struct planted in code */
}
else
goto wrongnumargs;
#else
arg2 = EVALCAR (x, env);
#endif
{ /* have two or more arguments */
#ifdef DEVAL
debug.info->a.args = scm_cons2 (t.arg1, arg2, SCM_EOL);
#endif
x = SCM_CDR (x);
if (SCM_NULLP (x)) {
ENTER_APPLY;
#ifdef CCLO
evap2:
#endif
switch (SCM_TYP7 (proc))
{ /* have two arguments */
case scm_tc7_subr_2:
case scm_tc7_subr_2o:
RETURN (SCM_SUBRF (proc) (t.arg1, arg2));
case scm_tc7_lsubr:
#ifdef DEVAL
RETURN (SCM_SUBRF (proc) (debug.info->a.args))
#else
RETURN (SCM_SUBRF (proc) (scm_cons2 (t.arg1, arg2, SCM_EOL)));
#endif
case scm_tc7_lsubr_2:
RETURN (SCM_SUBRF (proc) (t.arg1, arg2, SCM_EOL));
case scm_tc7_rpsubr:
case scm_tc7_asubr:
RETURN (SCM_SUBRF (proc) (t.arg1, arg2));
#ifdef CCLO
cclon:
case scm_tc7_cclo:
#ifdef DEVAL
RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc),
scm_cons (proc, debug.info->a.args),
SCM_EOL));
#else
RETURN (SCM_APPLY (SCM_CCLO_SUBR (proc),
scm_cons2 (proc, t.arg1,
scm_cons (arg2,
scm_eval_args (x,
env,
proc))),
SCM_EOL));
#endif
/* case scm_tc7_cclo:
x = scm_cons(arg2, scm_eval_args(x, env));
arg2 = t.arg1;
t.arg1 = proc;
proc = SCM_CCLO_SUBR(proc);
goto evap3; */
#endif
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
#ifdef DEVAL
debug.info->a.proc = proc;
#endif
goto evap2;
case scm_tcs_cons_gloc:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
x = SCM_ENTITY_PROCEDURE (proc);
#ifdef DEVAL
arg2 = debug.info->a.args;
#else
arg2 = scm_cons2 (t.arg1, arg2, SCM_EOL);
#endif
goto type_dispatch;
}
else if (!SCM_I_OPERATORP (proc))
goto badfun;
else
{
operatorn:
#ifdef DEVAL
RETURN (SCM_APPLY (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc),
scm_cons (proc, debug.info->a.args),
SCM_EOL));
#else
RETURN (SCM_APPLY (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc),
scm_cons2 (proc, t.arg1,
scm_cons (arg2,
scm_eval_args (x,
env,
proc))),
SCM_EOL));
#endif
}
case scm_tc7_subr_0:
case scm_tc7_cxr:
case scm_tc7_subr_1o:
case scm_tc7_subr_1:
case scm_tc7_subr_3:
case scm_tc7_contin:
goto wrongnumargs;
default:
goto badfun;
case scm_tcs_closures:
/* clos2: */
#ifdef DEVAL
env = EXTEND_ENV (SCM_CAR (SCM_CODE (proc)),
debug.info->a.args,
SCM_ENV (proc));
#else
env = EXTEND_ENV (SCM_CAR (SCM_CODE (proc)),
scm_cons2 (t.arg1, arg2, SCM_EOL), SCM_ENV (proc));
#endif
x = SCM_CODE (proc);
goto cdrxbegin;
}
}
#ifdef SCM_CAUTIOUS
if (SCM_IMP (x) || SCM_NECONSP (x))
goto wrongnumargs;
#endif
#ifdef DEVAL
debug.info->a.args = scm_cons2 (t.arg1, arg2,
scm_deval_args (x, env, proc,
SCM_CDRLOC (SCM_CDR (debug.info->a.args))));
#endif
ENTER_APPLY;
evap3:
switch (SCM_TYP7 (proc))
{ /* have 3 or more arguments */
#ifdef DEVAL
case scm_tc7_subr_3:
SCM_ASRTGO (SCM_NULLP (SCM_CDR (x)), wrongnumargs);
RETURN (SCM_SUBRF (proc) (t.arg1, arg2,
SCM_CADDR (debug.info->a.args)));
case scm_tc7_asubr:
#ifdef BUILTIN_RPASUBR
t.arg1 = SCM_SUBRF(proc)(t.arg1, arg2);
arg2 = SCM_CDR (SCM_CDR (debug.info->a.args));
do
{
t.arg1 = SCM_SUBRF(proc)(t.arg1, SCM_CAR (arg2));
arg2 = SCM_CDR (arg2);
}
while (SCM_NIMP (arg2));
RETURN (t.arg1)
#endif /* BUILTIN_RPASUBR */
case scm_tc7_rpsubr:
#ifdef BUILTIN_RPASUBR
if (SCM_FALSEP (SCM_SUBRF (proc) (t.arg1, arg2)))
RETURN (SCM_BOOL_F)
t.arg1 = SCM_CDR (SCM_CDR (debug.info->a.args));
do
{
if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (t.arg1))))
RETURN (SCM_BOOL_F)
arg2 = SCM_CAR (t.arg1);
t.arg1 = SCM_CDR (t.arg1);
}
while (SCM_NIMP (t.arg1));
RETURN (SCM_BOOL_T)
#else /* BUILTIN_RPASUBR */
RETURN (SCM_APPLY (proc, t.arg1,
scm_acons (arg2,
SCM_CDR (SCM_CDR (debug.info->a.args)),
SCM_EOL)))
#endif /* BUILTIN_RPASUBR */
case scm_tc7_lsubr_2:
RETURN (SCM_SUBRF (proc) (t.arg1, arg2,
SCM_CDR (SCM_CDR (debug.info->a.args))))
case scm_tc7_lsubr:
RETURN (SCM_SUBRF (proc) (debug.info->a.args))
#ifdef CCLO
case scm_tc7_cclo:
goto cclon;
#endif
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
debug.info->a.proc = proc;
goto evap3;
case scm_tcs_closures:
SCM_SET_ARGSREADY (debug);
env = EXTEND_ENV (SCM_CAR (SCM_CODE (proc)),
debug.info->a.args,
SCM_ENV (proc));
x = SCM_CODE (proc);
goto cdrxbegin;
#else /* DEVAL */
case scm_tc7_subr_3:
SCM_ASRTGO (SCM_NULLP (SCM_CDR (x)), wrongnumargs);
RETURN (SCM_SUBRF (proc) (t.arg1, arg2, EVALCAR (x, env)));
case scm_tc7_asubr:
#ifdef BUILTIN_RPASUBR
t.arg1 = SCM_SUBRF (proc) (t.arg1, arg2);
do
{
t.arg1 = SCM_SUBRF(proc)(t.arg1, EVALCAR(x, env));
x = SCM_CDR(x);
}
while (SCM_NIMP (x));
RETURN (t.arg1)
#endif /* BUILTIN_RPASUBR */
case scm_tc7_rpsubr:
#ifdef BUILTIN_RPASUBR
if (SCM_FALSEP (SCM_SUBRF (proc) (t.arg1, arg2)))
RETURN (SCM_BOOL_F)
do
{
t.arg1 = EVALCAR (x, env);
if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, t.arg1)))
RETURN (SCM_BOOL_F)
arg2 = t.arg1;
x = SCM_CDR (x);
}
while (SCM_NIMP (x));
RETURN (SCM_BOOL_T)
#else /* BUILTIN_RPASUBR */
RETURN (SCM_APPLY (proc, t.arg1,
scm_acons (arg2,
scm_eval_args (x, env, proc),
SCM_EOL)));
#endif /* BUILTIN_RPASUBR */
case scm_tc7_lsubr_2:
RETURN (SCM_SUBRF (proc) (t.arg1, arg2, scm_eval_args (x, env, proc)));
case scm_tc7_lsubr:
RETURN (SCM_SUBRF (proc) (scm_cons2 (t.arg1,
arg2,
scm_eval_args (x, env, proc))));
#ifdef CCLO
case scm_tc7_cclo:
goto cclon;
#endif
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
goto evap3;
case scm_tcs_closures:
#ifdef DEVAL
SCM_SET_ARGSREADY (debug);
#endif
env = EXTEND_ENV (SCM_CAR (SCM_CODE (proc)),
scm_cons2 (t.arg1,
arg2,
scm_eval_args (x, env, proc)),
SCM_ENV (proc));
x = SCM_CODE (proc);
goto cdrxbegin;
#endif /* DEVAL */
case scm_tcs_cons_gloc:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
#ifdef DEVAL
arg2 = debug.info->a.args;
#else
arg2 = scm_cons2 (t.arg1, arg2, scm_eval_args (x, env, proc));
#endif
x = SCM_ENTITY_PROCEDURE (proc);
goto type_dispatch;
}
else if (!SCM_I_OPERATORP (proc))
goto badfun;
else
goto operatorn;
case scm_tc7_subr_2:
case scm_tc7_subr_1o:
case scm_tc7_subr_2o:
case scm_tc7_subr_0:
case scm_tc7_cxr:
case scm_tc7_subr_1:
case scm_tc7_contin:
goto wrongnumargs;
default:
goto badfun;
}
}
#ifdef DEVAL
exit:
if (CHECK_EXIT && SCM_TRAPS_P)
if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug)))
{
SCM_CLEAR_TRACED_FRAME (debug);
if (SCM_CHEAPTRAPS_P)
t.arg1 = scm_make_debugobj (&debug);
else
{
scm_make_cont (&t.arg1);
if (setjmp (SCM_JMPBUF (t.arg1)))
{
proc = SCM_THROW_VALUE (t.arg1);
goto ret;
}
}
scm_ithrow (scm_sym_exit_frame, scm_cons2 (t.arg1, proc, SCM_EOL), 0);
}
ret:
scm_last_debug_frame = debug.prev;
return proc;
#endif
}
/* SECTION: This code is compiled once.
*/
#ifndef DEVAL
/* This code processes the arguments to apply:
(apply PROC ARG1 ... ARGS)
Given a list (ARG1 ... ARGS), this function conses the ARG1
... arguments onto the front of ARGS, and returns the resulting
list. Note that ARGS is a list; thus, the argument to this
function is a list whose last element is a list.
Apply calls this function, and applies PROC to the elements of the
result. apply:nconc2last takes care of building the list of
arguments, given (ARG1 ... ARGS).
Rather than do new consing, apply:nconc2last destroys its argument.
On that topic, this code came into my care with the following
beautifully cryptic comment on that topic: "This will only screw
you if you do (scm_apply scm_apply '( ... ))" If you know what
they're referring to, send me a patch to this comment. */
SCM_PROC(s_nconc2last, "apply:nconc2last", 1, 0, 0, scm_nconc2last);
SCM
scm_nconc2last (lst)
SCM lst;
{
SCM *lloc;
SCM_ASSERT (scm_ilength (lst) > 0, lst, SCM_ARG1, s_nconc2last);
lloc = &lst;
while (SCM_NNULLP (SCM_CDR (*lloc)))
lloc = SCM_CDRLOC (*lloc);
SCM_ASSERT (scm_ilength (SCM_CAR (*lloc)) >= 0, lst, SCM_ARG1, s_nconc2last);
*lloc = SCM_CAR (*lloc);
return lst;
}
#endif /* !DEVAL */
/* SECTION: When DEVAL is defined this code yields scm_dapply.
* It is compiled twice.
*/
#if 0
SCM
scm_apply (proc, arg1, args)
SCM proc;
SCM arg1;
SCM args;
{}
#endif
#if 0
SCM
scm_dapply (proc, arg1, args)
SCM proc;
SCM arg1;
SCM args;
{}
#endif
/* Apply a function to a list of arguments.
This function is exported to the Scheme level as taking two
required arguments and a tail argument, as if it were:
(lambda (proc arg1 . args) ...)
Thus, if you just have a list of arguments to pass to a procedure,
pass the list as ARG1, and '() for ARGS. If you have some fixed
args, pass the first as ARG1, then cons any remaining fixed args
onto the front of your argument list, and pass that as ARGS. */
SCM
SCM_APPLY (proc, arg1, args)
SCM proc;
SCM arg1;
SCM args;
{
#ifdef DEBUG_EXTENSIONS
#ifdef DEVAL
scm_debug_frame debug;
scm_debug_info debug_vect_body;
debug.prev = scm_last_debug_frame;
debug.status = SCM_APPLYFRAME;
debug.vect = &debug_vect_body;
debug.vect[0].a.proc = proc;
debug.vect[0].a.args = SCM_EOL;
scm_last_debug_frame = &debug;
#else
if (SCM_DEBUGGINGP)
return scm_dapply (proc, arg1, args);
#endif
#endif
SCM_ASRTGO (SCM_NIMP (proc), badproc);
/* If ARGS is the empty list, then we're calling apply with only two
arguments --- ARG1 is the list of arguments for PROC. Whatever
the case, futz with things so that ARG1 is the first argument to
give to PROC (or SCM_UNDEFINED if no args), and ARGS contains the
rest.
Setting the debug apply frame args this way is pretty messy.
Perhaps we should store arg1 and args directly in the frame as
received, and let scm_frame_arguments unpack them, because that's
a relatively rare operation. This works for now; if the Guile
developer archives are still around, see Mikael's post of
11-Apr-97. */
if (SCM_NULLP (args))
{
if (SCM_NULLP (arg1))
{
arg1 = SCM_UNDEFINED;
#ifdef DEVAL
debug.vect[0].a.args = SCM_EOL;
#endif
}
else
{
#ifdef DEVAL
debug.vect[0].a.args = arg1;
#endif
args = SCM_CDR (arg1);
arg1 = SCM_CAR (arg1);
}
}
else
{
/* SCM_ASRTGO(SCM_NIMP(args) && SCM_CONSP(args), wrongnumargs); */
args = scm_nconc2last (args);
#ifdef DEVAL
debug.vect[0].a.args = scm_cons (arg1, args);
#endif
}
#ifdef DEVAL
if (SCM_ENTER_FRAME_P && SCM_TRAPS_P)
{
SCM tmp;
if (SCM_CHEAPTRAPS_P)
tmp = scm_make_debugobj (&debug);
else
{
scm_make_cont (&tmp);
if (setjmp (SCM_JMPBUF (tmp)))
goto entap;
}
scm_ithrow (scm_sym_enter_frame, scm_cons (tmp, SCM_EOL), 0);
}
entap:
ENTER_APPLY;
#endif
#ifdef CCLO
tail:
#endif
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_2o:
args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args);
RETURN (SCM_SUBRF (proc) (arg1, args))
case scm_tc7_subr_2:
SCM_ASRTGO (SCM_NNULLP (args) && SCM_NULLP (SCM_CDR (args)),
wrongnumargs);
args = SCM_CAR (args);
RETURN (SCM_SUBRF (proc) (arg1, args))
case scm_tc7_subr_0:
SCM_ASRTGO (SCM_UNBNDP (arg1), wrongnumargs);
RETURN (SCM_SUBRF (proc) ())
case scm_tc7_subr_1:
case scm_tc7_subr_1o:
SCM_ASRTGO (SCM_NULLP (args), wrongnumargs);
RETURN (SCM_SUBRF (proc) (arg1))
case scm_tc7_cxr:
SCM_ASRTGO (SCM_NULLP (args), wrongnumargs);
#ifdef SCM_FLOATS
if (SCM_SUBRF (proc))
{
if (SCM_INUMP (arg1))
{
RETURN (scm_makdbl (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1)), 0.0));
}
SCM_ASRTGO (SCM_NIMP (arg1), floerr);
if (SCM_REALP (arg1))
{
RETURN (scm_makdbl (SCM_DSUBRF (proc) (SCM_REALPART (arg1)), 0.0));
}
#ifdef SCM_BIGDIG
if (SCM_BIGP (arg1))
RETURN (scm_makdbl (SCM_DSUBRF (proc) (scm_big2dbl (arg1)), 0.0))
#endif
floerr:
SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1,
SCM_ARG1, SCM_CHARS (SCM_SNAME (proc)));
}
#endif
proc = (SCM) SCM_SNAME (proc);
{
char *chrs = SCM_CHARS (proc) + SCM_LENGTH (proc) - 1;
while ('c' != *--chrs)
{
SCM_ASSERT (SCM_NIMP (arg1) && SCM_CONSP (arg1),
arg1, SCM_ARG1, SCM_CHARS (proc));
arg1 = ('a' == *chrs) ? SCM_CAR (arg1) : SCM_CDR (arg1);
}
RETURN (arg1)
}
case scm_tc7_subr_3:
RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CAR (SCM_CDR (args))))
case scm_tc7_lsubr:
#ifdef DEVAL
RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args))
#else
RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)))
#endif
case scm_tc7_lsubr_2:
SCM_ASRTGO (SCM_NIMP (args) && SCM_CONSP (args), wrongnumargs);
RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args)))
case scm_tc7_asubr:
if (SCM_NULLP (args))
RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED))
while (SCM_NIMP (args))
{
SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply");
arg1 = SCM_SUBRF (proc) (arg1, SCM_CAR (args));
args = SCM_CDR (args);
}
RETURN (arg1);
case scm_tc7_rpsubr:
if (SCM_NULLP (args))
RETURN (SCM_BOOL_T);
while (SCM_NIMP (args))
{
SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply");
if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, SCM_CAR (args))))
RETURN (SCM_BOOL_F);
arg1 = SCM_CAR (args);
args = SCM_CDR (args);
}
RETURN (SCM_BOOL_T);
case scm_tcs_closures:
#ifdef DEVAL
arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : debug.vect[0].a.args);
#else
arg1 = (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args));
#endif
#ifndef SCM_RECKLESS
if (scm_badargsp (SCM_CAR (SCM_CODE (proc)), arg1))
goto wrongnumargs;
#endif
/* Copy argument list */
if (SCM_IMP (arg1))
args = arg1;
else
{
SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED);
while (SCM_NIMP (arg1 = SCM_CDR (arg1))
&& SCM_CONSP (arg1))
{
SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1),
SCM_UNSPECIFIED));
tl = SCM_CDR (tl);
}
SCM_SETCDR (tl, arg1);
}
args = EXTEND_ENV (SCM_CAR (SCM_CODE (proc)), args, SCM_ENV (proc));
proc = SCM_CDR (SCM_CODE (proc));
again:
arg1 = proc;
while (SCM_NNULLP (arg1 = SCM_CDR (arg1)))
{
if (SCM_IMP (SCM_CAR (proc)))
{
if (SCM_ISYMP (SCM_CAR (proc)))
{
proc = scm_m_expand_body (proc, args);
goto again;
}
}
else
SCM_CEVAL (SCM_CAR (proc), args);
proc = arg1;
}
RETURN (EVALCAR (proc, args));
case scm_tc7_contin:
SCM_ASRTGO (SCM_NULLP (args), wrongnumargs);
scm_call_continuation (proc, arg1);
#ifdef CCLO
case scm_tc7_cclo:
#ifdef DEVAL
args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args);
arg1 = proc;
proc = SCM_CCLO_SUBR (proc);
debug.vect[0].a.proc = proc;
debug.vect[0].a.args = scm_cons (arg1, args);
#else
args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args));
arg1 = proc;
proc = SCM_CCLO_SUBR (proc);
#endif
goto tail;
#endif
case scm_tc7_pws:
proc = SCM_PROCEDURE (proc);
#ifdef DEVAL
debug.vect[0].a.proc = proc;
#endif
goto tail;
case scm_tcs_cons_gloc:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
{
#ifdef DEVAL
args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args);
#else
args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args));
#endif
RETURN (scm_apply_generic (proc, args));
}
else if (!SCM_I_OPERATORP (proc))
goto badproc;
else
{
#ifdef DEVAL
args = (SCM_UNBNDP(arg1) ? SCM_EOL : debug.vect[0].a.args);
#else
args = (SCM_UNBNDP(arg1) ? SCM_EOL : scm_cons (arg1, args));
#endif
arg1 = proc;
proc = (SCM_I_ENTITYP (proc)
? SCM_ENTITY_PROCEDURE (proc)
: SCM_OPERATOR_PROCEDURE (proc));
#ifdef DEVAL
debug.vect[0].a.proc = proc;
debug.vect[0].a.args = scm_cons (arg1, args);
#endif
if (SCM_NIMP (proc))
goto tail;
else
goto badproc;
}
wrongnumargs:
scm_wrong_num_args (proc);
default:
badproc:
scm_wta (proc, (char *) SCM_ARG1, "apply");
RETURN (arg1);
}
#ifdef DEVAL
exit:
if (CHECK_EXIT && SCM_TRAPS_P)
if (SCM_EXIT_FRAME_P || (SCM_TRACE_P && SCM_TRACED_FRAME_P (debug)))
{
SCM_CLEAR_TRACED_FRAME (debug);
if (SCM_CHEAPTRAPS_P)
arg1 = scm_make_debugobj (&debug);
else
{
scm_make_cont (&arg1);
if (setjmp (SCM_JMPBUF (arg1)))
{
proc = SCM_THROW_VALUE (arg1);
goto ret;
}
}
scm_ithrow (scm_sym_exit_frame, scm_cons2 (arg1, proc, SCM_EOL), 0);
}
ret:
scm_last_debug_frame = debug.prev;
return proc;
#endif
}
/* SECTION: The rest of this file is only read once.
*/
#ifndef DEVAL
/* Typechecking for multi-argument MAP and FOR-EACH.
Verify that each element of the vector ARGV, except for the first,
is a proper list whose length is LEN. Attribute errors to WHO,
and claim that the i'th element of ARGV is WHO's i+2'th argument. */
static inline void
check_map_args (SCM argv,
long len,
SCM gf,
SCM proc,
SCM args,
const char *who)
{
SCM *ve = SCM_VELTS (argv);
int i;
for (i = SCM_LENGTH (argv) - 1; i >= 1; i--)
{
int elt_len = scm_ilength (ve[i]);
if (elt_len < 0)
{
if (gf)
scm_apply_generic (gf, scm_cons (proc, args));
else
scm_wrong_type_arg (who, i + 2, ve[i]);
}
if (elt_len != len)
scm_out_of_range (who, ve[i]);
}
scm_remember (&argv);
}
SCM_GPROC (s_map, "map", 2, 0, 1, scm_map, g_map);
/* Note: Currently, scm_map applies PROC to the argument list(s)
sequentially, starting with the first element(s). This is used in
evalext.c where the Scheme procedure `serial-map', which guarantees
sequential behaviour, is implemented using scm_map. If the
behaviour changes, we need to update `serial-map'.
*/
SCM
scm_map (proc, arg1, args)
SCM proc;
SCM arg1;
SCM args;
{
long i, len;
SCM res = SCM_EOL;
SCM *pres = &res;
SCM *ve = &args; /* Keep args from being optimized away. */
if (SCM_NULLP (arg1))
return res;
len = scm_ilength (arg1);
SCM_GASSERTn (len >= 0,
g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map);
if (SCM_NULLP (args))
{
while (SCM_NIMP (arg1))
{
SCM_GASSERT2 (SCM_CONSP (arg1), g_map, proc, arg1, SCM_ARG2, s_map);
*pres = scm_cons (scm_apply (proc, SCM_CAR (arg1), scm_listofnull),
SCM_EOL);
pres = SCM_CDRLOC (*pres);
arg1 = SCM_CDR (arg1);
}
return res;
}
args = scm_vector (arg1 = scm_cons (arg1, args));
ve = SCM_VELTS (args);
#ifndef SCM_RECKLESS
check_map_args (args, len, g_map, proc, arg1, s_map);
#endif
while (1)
{
arg1 = SCM_EOL;
for (i = SCM_LENGTH (args) - 1; i >= 0; i--)
{
if (SCM_IMP (ve[i]))
return res;
arg1 = scm_cons (SCM_CAR (ve[i]), arg1);
ve[i] = SCM_CDR (ve[i]);
}
*pres = scm_cons (scm_apply (proc, arg1, SCM_EOL), SCM_EOL);
pres = SCM_CDRLOC (*pres);
}
}
SCM_GPROC (s_for_each, "for-each", 2, 0, 1, scm_for_each, g_for_each);
SCM
scm_for_each (proc, arg1, args)
SCM proc;
SCM arg1;
SCM args;
{
SCM *ve = &args; /* Keep args from being optimized away. */
long i, len;
if SCM_NULLP (arg1)
return SCM_UNSPECIFIED;
len = scm_ilength (arg1);
SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args),
SCM_ARG2, s_for_each);
if SCM_NULLP (args)
{
while SCM_NIMP (arg1)
{
SCM_GASSERT2 (SCM_CONSP (arg1),
g_for_each, proc, arg1, SCM_ARG2, s_for_each);
scm_apply (proc, SCM_CAR (arg1), scm_listofnull);
arg1 = SCM_CDR (arg1);
}
return SCM_UNSPECIFIED;
}
args = scm_vector (arg1 = scm_cons (arg1, args));
ve = SCM_VELTS (args);
#ifndef SCM_RECKLESS
check_map_args (args, len, g_for_each, proc, arg1, s_for_each);
#endif
while (1)
{
arg1 = SCM_EOL;
for (i = SCM_LENGTH (args) - 1; i >= 0; i--)
{
if SCM_IMP
(ve[i]) return SCM_UNSPECIFIED;
arg1 = scm_cons (SCM_CAR (ve[i]), arg1);
ve[i] = SCM_CDR (ve[i]);
}
scm_apply (proc, arg1, SCM_EOL);
}
}
SCM
scm_closure (code, env)
SCM code;
SCM env;
{
register SCM z;
SCM_NEWCELL (z);
SCM_SETCODE (z, code);
SCM_SETENV (z, env);
return z;
}
long scm_tc16_promise;
SCM
scm_makprom (code)
SCM code;
{
SCM_RETURN_NEWSMOB (scm_tc16_promise, code);
}
static int prinprom SCM_P ((SCM exp, SCM port, scm_print_state *pstate));
static int
prinprom (exp, port, pstate)
SCM exp;
SCM port;
scm_print_state *pstate;
{
int writingp = SCM_WRITINGP (pstate);
scm_puts ("#<promise ", port);
SCM_SET_WRITINGP (pstate, 1);
scm_iprin1 (SCM_CDR (exp), port, pstate);
SCM_SET_WRITINGP (pstate, writingp);
scm_putc ('>', port);
return !0;
}
SCM_PROC(s_force, "force", 1, 0, 0, scm_force);
SCM
scm_force (x)
SCM x;
{
SCM_ASSERT (SCM_NIMP(x) && SCM_TYP16 (x) == scm_tc16_promise,
x, SCM_ARG1, s_force);
if (!((1L << 16) & SCM_CAR (x)))
{
SCM ans = scm_apply (SCM_CDR (x), SCM_EOL, SCM_EOL);
if (!((1L << 16) & SCM_CAR (x)))
{
SCM_DEFER_INTS;
SCM_SETCDR (x, ans);
SCM_SETOR_CAR (x, (1L << 16));
SCM_ALLOW_INTS;
}
}
return SCM_CDR (x);
}
SCM_PROC (s_promise_p, "promise?", 1, 0, 0, scm_promise_p);
SCM
scm_promise_p (x)
SCM x;
{
return ((SCM_NIMP (x) && (SCM_TYP16 (x) == scm_tc16_promise))
? SCM_BOOL_T
: SCM_BOOL_F);
}
SCM_PROC (s_cons_source, "cons-source", 3, 0, 0, scm_cons_source);
SCM
scm_cons_source (SCM xorig, SCM x, SCM y)
{
SCM p, z;
SCM_NEWCELL (z);
SCM_SETCAR (z, x);
SCM_SETCDR (z, y);
/* Copy source properties possibly associated with xorig. */
p = scm_whash_lookup (scm_source_whash, xorig);
if (SCM_NIMP (p))
scm_whash_insert (scm_source_whash, z, p);
return z;
}
SCM_PROC (s_copy_tree, "copy-tree", 1, 0, 0, scm_copy_tree);
SCM
scm_copy_tree (obj)
SCM obj;
{
SCM ans, tl;
if (SCM_IMP (obj))
return obj;
if (SCM_VECTORP (obj))
{
scm_sizet i = SCM_LENGTH (obj);
ans = scm_make_vector (SCM_MAKINUM (i), SCM_UNSPECIFIED);
while (i--)
SCM_VELTS (ans)[i] = scm_copy_tree (SCM_VELTS (obj)[i]);
return ans;
}
if (SCM_NCONSP (obj))
return obj;
/* return scm_cons(scm_copy_tree(SCM_CAR(obj)), scm_copy_tree(SCM_CDR(obj))); */
ans = tl = scm_cons_source (obj,
scm_copy_tree (SCM_CAR (obj)),
SCM_UNSPECIFIED);
while (SCM_NIMP (obj = SCM_CDR (obj)) && SCM_CONSP (obj))
{
SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)),
SCM_UNSPECIFIED));
tl = SCM_CDR (tl);
}
SCM_SETCDR (tl, obj);
return ans;
}
SCM
scm_eval_3 (obj, copyp, env)
SCM obj;
int copyp;
SCM env;
{
if (SCM_NIMP (SCM_CDR (scm_system_transformer)))
obj = scm_apply (SCM_CDR (scm_system_transformer), obj, scm_listofnull);
else if (copyp)
obj = scm_copy_tree (obj);
return SCM_XEVAL (obj, env);
}
SCM_PROC(s_eval2, "eval2", 2, 0, 0, scm_eval2);
SCM
scm_eval2 (obj, env_thunk)
SCM obj;
SCM env_thunk;
{
return scm_eval_3 (obj, 1, scm_top_level_env (env_thunk));
}
SCM_PROC(s_eval, "eval", 1, 0, 0, scm_eval);
SCM
scm_eval (obj)
SCM obj;
{
return scm_eval_3 (obj,
1,
scm_top_level_env
(SCM_CDR (scm_top_level_lookup_closure_var)));
}
/* SCM_PROC(s_eval_x, "eval!", 1, 0, 0, scm_eval_x); */
SCM
scm_eval_x (obj)
SCM obj;
{
return scm_eval_3 (obj,
0,
scm_top_level_env
(SCM_CDR (scm_top_level_lookup_closure_var)));
}
/* At this point, scm_deval and scm_dapply are generated.
*/
#ifdef DEBUG_EXTENSIONS
# define DEVAL
# include "eval.c"
#endif
void
scm_init_eval ()
{
scm_init_opts (scm_evaluator_traps,
scm_evaluator_trap_table,
SCM_N_EVALUATOR_TRAPS);
scm_init_opts (scm_eval_options_interface,
scm_eval_opts,
SCM_N_EVAL_OPTIONS);
scm_tc16_promise = scm_make_smob_type ("promise", 0);
scm_set_smob_mark (scm_tc16_promise, scm_markcdr);
scm_set_smob_print (scm_tc16_promise, prinprom);
scm_f_apply = scm_make_subr ("apply", scm_tc7_lsubr_2, scm_apply);
scm_system_transformer = scm_sysintern ("scm:eval-transformer", SCM_UNDEFINED);
scm_sym_dot = SCM_CAR (scm_sysintern (".", SCM_UNDEFINED));
scm_sym_arrow = SCM_CAR (scm_sysintern ("=>", SCM_UNDEFINED));
scm_sym_else = SCM_CAR (scm_sysintern ("else", SCM_UNDEFINED));
scm_sym_unquote = SCM_CAR (scm_sysintern ("unquote", SCM_UNDEFINED));
scm_sym_uq_splicing = SCM_CAR (scm_sysintern ("unquote-splicing", SCM_UNDEFINED));
scm_nil = scm_sysintern ("nil", SCM_UNDEFINED);
SCM_SETCDR (scm_nil, SCM_CAR (scm_nil));
scm_nil = SCM_CAR (scm_nil);
scm_t = scm_sysintern ("t", SCM_UNDEFINED);
SCM_SETCDR (scm_t, SCM_CAR (scm_t));
scm_t = SCM_CAR (scm_t);
/* acros */
/* end of acros */
scm_top_level_lookup_closure_var =
scm_sysintern("*top-level-lookup-closure*", SCM_BOOL_F);
scm_can_use_top_level_lookup_closure_var = 1;
#ifdef DEBUG_EXTENSIONS
scm_sym_enter_frame = SCM_CAR (scm_sysintern ("enter-frame", SCM_UNDEFINED));
scm_sym_apply_frame = SCM_CAR (scm_sysintern ("apply-frame", SCM_UNDEFINED));
scm_sym_exit_frame = SCM_CAR (scm_sysintern ("exit-frame", SCM_UNDEFINED));
scm_sym_trace = SCM_CAR (scm_sysintern ("trace", SCM_UNDEFINED));
#endif
#include "eval.x"
scm_add_feature ("delay");
}
#endif /* !DEVAL */
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