mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 11:50:28 +02:00
d8a071fc4e
* libguile/memoize.c (scm_m_lambda_star): Define lambda* in the
pre-psyntax env, and make it memoize lambda* expressions.
* libguile/eval.c (BOOT_CLOSURE_PARSE_FULL): New helper.
(error_invalid_keyword, error_unrecognized_keyword): New helpers.
(prepare_boot_closure_env_for_apply): Flesh out application of boot
closures with "full" arity.
(prepare_boot_closure_env_for_eval): Punt to
prepare_boot_closure_env_for_eval for the full-arity case.
* module/ice-9/eval.scm (make-fixed-closure): Rename from `closure', and
just handle fixed arities, where there is no rest argument..
(make-general-closure): New helper, a procedure, that returns a
closure that can take rest, optional, and keyword arguments.
(eval): Adapt to call make-fixed-closure or make-general-closure as
appropriate.
* test-suite/tests/optargs.test ("lambda* inits"): Test the memoizer as
well.
1742 lines
54 KiB
C
1742 lines
54 KiB
C
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010
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* Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 3 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libguile/__scm.h"
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#include "libguile/_scm.h"
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#include "libguile/continuations.h"
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#include "libguile/eq.h"
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#include "libguile/list.h"
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#include "libguile/macros.h"
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#include "libguile/memoize.h"
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#include "libguile/modules.h"
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#include "libguile/srcprop.h"
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#include "libguile/ports.h"
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#include "libguile/print.h"
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#include "libguile/strings.h"
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#include "libguile/throw.h"
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#include "libguile/validate.h"
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#define CAR(x) SCM_CAR(x)
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#define CDR(x) SCM_CDR(x)
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#define CAAR(x) SCM_CAAR(x)
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#define CADR(x) SCM_CADR(x)
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#define CDAR(x) SCM_CDAR(x)
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#define CDDR(x) SCM_CDDR(x)
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#define CADDR(x) SCM_CADDR(x)
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#define CDDDR(x) SCM_CDDDR(x)
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#define CADDDR(x) SCM_CADDDR(x)
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static const char s_bad_expression[] = "Bad expression";
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static const char s_expression[] = "Missing or extra expression in";
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static const char s_missing_expression[] = "Missing expression in";
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static const char s_extra_expression[] = "Extra expression in";
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static const char s_empty_combination[] = "Illegal empty combination";
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static const char s_missing_body_expression[] = "Missing body expression in";
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static const char s_mixed_body_forms[] = "Mixed definitions and expressions in";
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static const char s_bad_define[] = "Bad define placement";
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static const char s_missing_clauses[] = "Missing clauses";
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static const char s_misplaced_else_clause[] = "Misplaced else clause";
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static const char s_bad_case_clause[] = "Bad case clause";
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static const char s_bad_case_labels[] = "Bad case labels";
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static const char s_duplicate_case_label[] = "Duplicate case label";
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static const char s_bad_cond_clause[] = "Bad cond clause";
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static const char s_missing_recipient[] = "Missing recipient in";
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static const char s_bad_variable[] = "Bad variable";
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static const char s_bad_bindings[] = "Bad bindings";
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static const char s_bad_binding[] = "Bad binding";
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static const char s_duplicate_binding[] = "Duplicate binding";
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static const char s_bad_exit_clause[] = "Bad exit clause";
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static const char s_bad_formals[] = "Bad formals";
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static const char s_bad_formal[] = "Bad formal";
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static const char s_duplicate_formal[] = "Duplicate formal";
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static const char s_splicing[] = "Non-list result for unquote-splicing";
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static const char s_bad_slot_number[] = "Bad slot number";
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/* Signal a syntax error. We distinguish between the form that caused the
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* error and the enclosing expression. The error message will print out as
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* shown in the following pattern. The file name and line number are only
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* given when they can be determined from the erroneous form or from the
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* enclosing expression.
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*
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* <filename>: In procedure memoization:
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* <filename>: In file <name>, line <nr>: <error-message> in <expression>. */
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SCM_SYMBOL (syntax_error_key, "syntax-error");
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/* The prototype is needed to indicate that the function does not return. */
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static void
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syntax_error (const char* const, const SCM, const SCM) SCM_NORETURN;
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static void
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syntax_error (const char* const msg, const SCM form, const SCM expr)
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{
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SCM msg_string = scm_from_locale_string (msg);
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SCM filename = SCM_BOOL_F;
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SCM linenr = SCM_BOOL_F;
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const char *format;
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SCM args;
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if (scm_is_pair (form))
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{
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filename = scm_source_property (form, scm_sym_filename);
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linenr = scm_source_property (form, scm_sym_line);
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}
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if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr))
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{
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filename = scm_source_property (expr, scm_sym_filename);
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linenr = scm_source_property (expr, scm_sym_line);
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}
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if (!SCM_UNBNDP (expr))
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{
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if (scm_is_true (filename))
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{
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format = "In file ~S, line ~S: ~A ~S in expression ~S.";
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args = scm_list_5 (filename, linenr, msg_string, form, expr);
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}
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else if (scm_is_true (linenr))
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{
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format = "In line ~S: ~A ~S in expression ~S.";
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args = scm_list_4 (linenr, msg_string, form, expr);
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}
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else
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{
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format = "~A ~S in expression ~S.";
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args = scm_list_3 (msg_string, form, expr);
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}
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}
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else
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{
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if (scm_is_true (filename))
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{
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format = "In file ~S, line ~S: ~A ~S.";
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args = scm_list_4 (filename, linenr, msg_string, form);
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}
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else if (scm_is_true (linenr))
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{
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format = "In line ~S: ~A ~S.";
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args = scm_list_3 (linenr, msg_string, form);
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}
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else
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{
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format = "~A ~S.";
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args = scm_list_2 (msg_string, form);
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}
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}
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scm_error (syntax_error_key, "memoization", format, args, SCM_BOOL_F);
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}
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/* Shortcut macros to simplify syntax error handling. */
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#define ASSERT_SYNTAX(cond, message, form) \
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{ if (SCM_UNLIKELY (!(cond))) \
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syntax_error (message, form, SCM_UNDEFINED); }
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#define ASSERT_SYNTAX_2(cond, message, form, expr) \
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{ if (SCM_UNLIKELY (!(cond))) \
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syntax_error (message, form, expr); }
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/* {Evaluator memoized expressions}
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*/
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scm_t_bits scm_tc16_memoized;
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#define MAKMEMO(n, args) (scm_cell (scm_tc16_memoized | ((n) << 16), (scm_t_bits)(args)))
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#define MAKMEMO_BEGIN(exps) \
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MAKMEMO (SCM_M_BEGIN, exps)
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#define MAKMEMO_IF(test, then, else_) \
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MAKMEMO (SCM_M_IF, scm_cons (test, scm_cons (then, else_)))
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#define FIXED_ARITY(nreq) \
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scm_list_1 (SCM_I_MAKINUM (nreq))
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#define REST_ARITY(nreq, rest) \
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scm_list_2 (SCM_I_MAKINUM (nreq), rest)
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#define FULL_ARITY(nreq, rest, nopt, kw, inits, alt) \
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scm_list_n (SCM_I_MAKINUM (nreq), rest, SCM_I_MAKINUM (nopt), kw, inits, \
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alt, SCM_UNDEFINED)
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#define MAKMEMO_LAMBDA(body, arity) \
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MAKMEMO (SCM_M_LAMBDA, (scm_cons (body, arity)))
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#define MAKMEMO_LET(inits, body) \
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MAKMEMO (SCM_M_LET, scm_cons (inits, body))
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#define MAKMEMO_QUOTE(exp) \
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MAKMEMO (SCM_M_QUOTE, exp)
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#define MAKMEMO_DEFINE(var, val) \
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MAKMEMO (SCM_M_DEFINE, scm_cons (var, val))
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#define MAKMEMO_DYNWIND(in, expr, out) \
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MAKMEMO (SCM_M_DYNWIND, scm_cons (in, scm_cons (expr, out)))
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#define MAKMEMO_WITH_FLUIDS(fluids, vals, expr) \
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MAKMEMO (SCM_M_WITH_FLUIDS, scm_cons (fluids, scm_cons (vals, expr)))
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#define MAKMEMO_APPLY(proc, args)\
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MAKMEMO (SCM_M_APPLY, scm_list_2 (proc, args))
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#define MAKMEMO_CONT(proc) \
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MAKMEMO (SCM_M_CONT, proc)
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#define MAKMEMO_CALL_WITH_VALUES(prod, cons) \
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MAKMEMO (SCM_M_CALL_WITH_VALUES, scm_cons (prod, cons))
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#define MAKMEMO_CALL(proc, nargs, args) \
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MAKMEMO (SCM_M_CALL, scm_cons (proc, scm_cons (SCM_I_MAKINUM (nargs), args)))
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#define MAKMEMO_LEX_REF(n) \
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MAKMEMO (SCM_M_LEXICAL_REF, SCM_I_MAKINUM (n))
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#define MAKMEMO_LEX_SET(n, val) \
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MAKMEMO (SCM_M_LEXICAL_SET, scm_cons (SCM_I_MAKINUM (n), val))
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#define MAKMEMO_TOP_REF(var) \
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MAKMEMO (SCM_M_TOPLEVEL_REF, var)
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#define MAKMEMO_TOP_SET(var, val) \
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MAKMEMO (SCM_M_TOPLEVEL_SET, scm_cons (var, val))
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#define MAKMEMO_MOD_REF(mod, var, public) \
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MAKMEMO (SCM_M_MODULE_REF, scm_cons (mod, scm_cons (var, public)))
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#define MAKMEMO_MOD_SET(val, mod, var, public) \
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MAKMEMO (SCM_M_MODULE_SET, scm_cons (val, scm_cons (mod, scm_cons (var, public))))
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#define MAKMEMO_PROMPT(tag, exp, handler) \
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MAKMEMO (SCM_M_PROMPT, scm_cons (tag, scm_cons (exp, handler)))
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/* Primitives for the evaluator */
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scm_t_bits scm_tc16_memoizer;
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#define SCM_MEMOIZER_P(x) (SCM_SMOB_PREDICATE (scm_tc16_memoizer, (x)))
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#define SCM_MEMOIZER(M) (SCM_SMOB_OBJECT_1 (M))
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/* This table must agree with the list of M_ constants in memoize.h */
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static const char *const memoized_tags[] =
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{
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"begin",
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"if",
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"lambda",
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"let",
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"quote",
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"define",
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"dynwind",
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"with-fluids",
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"apply",
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"call/cc",
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"call-with-values",
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"call",
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"lexical-ref",
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"lexical-set!",
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"toplevel-ref",
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"toplevel-set!",
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"module-ref",
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"module-set!",
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"prompt",
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};
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static int
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scm_print_memoized (SCM memoized, SCM port, scm_print_state *pstate)
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{
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scm_puts ("#<memoized ", port);
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scm_write (scm_unmemoize_expression (memoized), port);
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scm_puts (">", port);
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return 1;
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}
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static SCM scm_m_at (SCM xorig, SCM env);
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static SCM scm_m_atat (SCM xorig, SCM env);
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static SCM scm_m_and (SCM xorig, SCM env);
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static SCM scm_m_begin (SCM xorig, SCM env);
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static SCM scm_m_cond (SCM xorig, SCM env);
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static SCM scm_m_define (SCM x, SCM env);
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static SCM scm_m_with_fluids (SCM xorig, SCM env);
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static SCM scm_m_eval_when (SCM xorig, SCM env);
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static SCM scm_m_if (SCM xorig, SCM env);
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static SCM scm_m_lambda (SCM xorig, SCM env);
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static SCM scm_m_lambda_star (SCM xorig, SCM env);
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static SCM scm_m_let (SCM xorig, SCM env);
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static SCM scm_m_letrec (SCM xorig, SCM env);
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static SCM scm_m_letstar (SCM xorig, SCM env);
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static SCM scm_m_or (SCM xorig, SCM env);
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static SCM scm_m_quote (SCM xorig, SCM env);
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static SCM scm_m_set_x (SCM xorig, SCM env);
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static SCM
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memoize_env_ref_macro (SCM env, SCM x)
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{
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SCM var;
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for (; scm_is_pair (env); env = CDR (env))
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if (scm_is_eq (x, CAR (env)))
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return SCM_BOOL_F; /* lexical */
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var = scm_module_variable (env, x);
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if (scm_is_true (var) && scm_is_true (scm_variable_bound_p (var))
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&& (scm_is_true (scm_macro_p (scm_variable_ref (var)))
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|| SCM_MEMOIZER_P (scm_variable_ref (var))))
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return scm_variable_ref (var);
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else
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return SCM_BOOL_F; /* anything else */
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}
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static int
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memoize_env_var_is_free (SCM env, SCM x)
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{
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for (; scm_is_pair (env); env = CDR (env))
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if (scm_is_eq (x, CAR (env)))
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return 0; /* bound */
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return 1; /* free */
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}
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static int
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memoize_env_lexical_index (SCM env, SCM x)
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{
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int i = 0;
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for (; scm_is_pair (env); env = CDR (env), i++)
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if (scm_is_eq (x, CAR (env)))
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return i; /* bound */
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return -1; /* free */
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}
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static SCM
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memoize_env_extend (SCM env, SCM vars)
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{
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return scm_append (scm_list_2 (vars, env));
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}
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static SCM
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memoize (SCM exp, SCM env)
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{
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if (scm_is_pair (exp))
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{
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SCM car;
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scm_t_macro_primitive trans = NULL;
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SCM macro = SCM_BOOL_F, memoizer = SCM_BOOL_F;
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car = CAR (exp);
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if (scm_is_symbol (car))
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macro = memoize_env_ref_macro (env, car);
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if (scm_is_true (scm_macro_p (macro)))
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trans = scm_i_macro_primitive (macro);
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else if (SCM_MEMOIZER_P (macro))
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memoizer = SCM_MEMOIZER (macro);
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if (trans)
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return trans (exp, env);
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else
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{
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SCM args = SCM_EOL;
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int nargs = 0;
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SCM proc = CAR (exp);
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for (exp = CDR (exp); scm_is_pair (exp); exp = CDR (exp), nargs++)
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args = scm_cons (memoize (CAR (exp), env), args);
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if (scm_is_null (exp))
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{
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if (scm_is_true (memoizer))
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return scm_apply (memoizer, scm_reverse_x (args, SCM_UNDEFINED),
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SCM_EOL);
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else
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return MAKMEMO_CALL (memoize (proc, env),
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nargs,
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scm_reverse_x (args, SCM_UNDEFINED));
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}
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else
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syntax_error ("expected a proper list", exp, SCM_UNDEFINED);
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}
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}
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else if (scm_is_symbol (exp))
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{
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int i = memoize_env_lexical_index (env, exp);
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if (i < 0)
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return MAKMEMO_TOP_REF (exp);
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else
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return MAKMEMO_LEX_REF (i);
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}
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else
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return MAKMEMO_QUOTE (exp);
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}
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static SCM
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memoize_exprs (SCM forms, const SCM env)
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{
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SCM ret = SCM_EOL;
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for (; !scm_is_null (forms); forms = CDR (forms))
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ret = scm_cons (memoize (CAR (forms), env), ret);
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return scm_reverse_x (ret, SCM_UNDEFINED);
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}
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static SCM
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memoize_sequence (const SCM forms, const SCM env)
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||
{
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ASSERT_SYNTAX (scm_ilength (forms) >= 1, s_bad_expression,
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scm_cons (scm_sym_begin, forms));
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if (scm_is_null (CDR (forms)))
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return memoize (CAR (forms), env);
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else
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return MAKMEMO_BEGIN (memoize_exprs (forms, env));
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||
}
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||
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||
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||
|
||
/* Memoization. */
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||
|
||
#define SCM_SYNTAX(RANAME, STR, CFN) \
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SCM_SNARF_HERE(static const char RANAME[]=STR)\
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SCM_SNARF_INIT(scm_c_define (RANAME, scm_i_make_primitive_macro (RANAME, CFN)))
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||
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||
/* True primitive syntax */
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||
SCM_SYNTAX (s_at, "@", scm_m_at);
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SCM_SYNTAX (s_atat, "@@", scm_m_atat);
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||
SCM_SYNTAX (s_begin, "begin", scm_m_begin);
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||
SCM_SYNTAX (s_define, "define", scm_m_define);
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SCM_SYNTAX (s_with_fluids, "with-fluids", scm_m_with_fluids);
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SCM_SYNTAX (s_eval_when, "eval-when", scm_m_eval_when);
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||
SCM_SYNTAX (s_if, "if", scm_m_if);
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||
SCM_SYNTAX (s_lambda, "lambda", scm_m_lambda);
|
||
SCM_SYNTAX (s_let, "let", scm_m_let);
|
||
SCM_SYNTAX (s_quote, "quote", scm_m_quote);
|
||
SCM_SYNTAX (s_set_x, "set!", scm_m_set_x);
|
||
|
||
/* Convenient syntax during boot, expands to primitive syntax. Replaced after
|
||
psyntax boots. */
|
||
SCM_SYNTAX (s_and, "and", scm_m_and);
|
||
SCM_SYNTAX (s_cond, "cond", scm_m_cond);
|
||
SCM_SYNTAX (s_letrec, "letrec", scm_m_letrec);
|
||
SCM_SYNTAX (s_letstar, "let*", scm_m_letstar);
|
||
SCM_SYNTAX (s_or, "or", scm_m_or);
|
||
SCM_SYNTAX (s_lambda_star, "lambda*", scm_m_lambda_star);
|
||
|
||
SCM_GLOBAL_SYMBOL (scm_sym_apply, "apply");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_arrow, "=>");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_at, "@");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_atat, "@@");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_at_call_with_values, "@call-with-values");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_atapply, "@apply");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_atcall_cc, "@call-with-current-continuation");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_begin, "begin");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_case, "case");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_cond, "cond");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_define, "define");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_at_dynamic_wind, "@dynamic-wind");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_with_fluids, "with-fluids");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_else, "else");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_eval_when, "eval-when");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_if, "if");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_lambda, "lambda");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_let, "let");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_letrec, "letrec");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_letstar, "let*");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_or, "or");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_at_prompt, "@prompt");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_quote, "quote");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_set_x, "set!");
|
||
SCM_SYMBOL (sym_lambda_star, "lambda*");
|
||
SCM_SYMBOL (sym_eval, "eval");
|
||
SCM_SYMBOL (sym_load, "load");
|
||
|
||
SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, "quasiquote");
|
||
SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing");
|
||
|
||
SCM_KEYWORD (kw_allow_other_keys, "allow-other-keys");
|
||
SCM_KEYWORD (kw_optional, "optional");
|
||
SCM_KEYWORD (kw_key, "key");
|
||
SCM_KEYWORD (kw_rest, "rest");
|
||
|
||
|
||
static SCM
|
||
scm_m_at (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
ASSERT_SYNTAX (scm_ilength (expr) == 3, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_is_symbol (CADDR (expr)), s_bad_expression, expr);
|
||
|
||
return MAKMEMO_MOD_REF (CADR (expr), CADDR (expr), SCM_BOOL_T);
|
||
}
|
||
|
||
static SCM
|
||
scm_m_atat (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
ASSERT_SYNTAX (scm_ilength (expr) == 3, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_is_symbol (CADDR (expr)), s_bad_expression, expr);
|
||
|
||
return MAKMEMO_MOD_REF (CADR (expr), CADDR (expr), SCM_BOOL_F);
|
||
}
|
||
|
||
static SCM
|
||
scm_m_and (SCM expr, SCM env)
|
||
{
|
||
const SCM cdr_expr = CDR (expr);
|
||
|
||
if (scm_is_null (cdr_expr))
|
||
return MAKMEMO_QUOTE (SCM_BOOL_T);
|
||
ASSERT_SYNTAX (scm_is_pair (cdr_expr), s_bad_expression, expr);
|
||
|
||
if (scm_is_null (CDR (cdr_expr)))
|
||
return memoize (CAR (cdr_expr), env);
|
||
else
|
||
return MAKMEMO_IF (memoize (CAR (cdr_expr), env),
|
||
scm_m_and (cdr_expr, env),
|
||
MAKMEMO_QUOTE (SCM_BOOL_F));
|
||
}
|
||
|
||
static SCM
|
||
scm_m_begin (SCM expr, SCM env)
|
||
{
|
||
const SCM cdr_expr = CDR (expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_bad_expression, expr);
|
||
return MAKMEMO_BEGIN (memoize_exprs (cdr_expr, env));
|
||
}
|
||
|
||
static SCM
|
||
scm_m_cond (SCM expr, SCM env)
|
||
{
|
||
/* Check, whether 'else or '=> is a literal, i. e. not bound to a value. */
|
||
const int else_literal_p = memoize_env_var_is_free (env, scm_sym_else);
|
||
const int arrow_literal_p = memoize_env_var_is_free (env, scm_sym_arrow);
|
||
|
||
const SCM clauses = CDR (expr);
|
||
SCM clause_idx;
|
||
SCM ret, loc;
|
||
|
||
ASSERT_SYNTAX (scm_ilength (clauses) >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr);
|
||
|
||
ret = scm_cons (SCM_UNDEFINED, MAKMEMO_QUOTE (SCM_UNSPECIFIED));
|
||
loc = ret;
|
||
|
||
for (clause_idx = clauses;
|
||
!scm_is_null (clause_idx);
|
||
clause_idx = CDR (clause_idx))
|
||
{
|
||
SCM test;
|
||
|
||
const SCM clause = CAR (clause_idx);
|
||
const long length = scm_ilength (clause);
|
||
ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr);
|
||
|
||
test = CAR (clause);
|
||
if (scm_is_eq (test, scm_sym_else) && else_literal_p)
|
||
{
|
||
const int last_clause_p = scm_is_null (CDR (clause_idx));
|
||
ASSERT_SYNTAX_2 (length >= 2,
|
||
s_bad_cond_clause, clause, expr);
|
||
ASSERT_SYNTAX_2 (last_clause_p,
|
||
s_misplaced_else_clause, clause, expr);
|
||
SCM_SETCDR (loc,
|
||
memoize (scm_cons (scm_sym_begin, CDR (clause)), env));
|
||
}
|
||
else if (length >= 2
|
||
&& scm_is_eq (CADR (clause), scm_sym_arrow)
|
||
&& arrow_literal_p)
|
||
{
|
||
SCM tmp = scm_gensym (scm_from_locale_string ("cond "));
|
||
SCM i;
|
||
SCM new_env = scm_cons (tmp, env);
|
||
ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr);
|
||
ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr);
|
||
i = MAKMEMO_IF (MAKMEMO_LEX_REF (0),
|
||
MAKMEMO_CALL (memoize (CADDR (clause),
|
||
scm_cons (tmp, new_env)),
|
||
1,
|
||
scm_list_1 (MAKMEMO_LEX_REF (0))),
|
||
MAKMEMO_QUOTE (SCM_UNSPECIFIED));
|
||
SCM_SETCDR (loc,
|
||
MAKMEMO_LET (scm_list_1 (memoize (CAR (clause), env)),
|
||
i));
|
||
env = new_env;
|
||
loc = scm_last_pair (SCM_MEMOIZED_ARGS (i));
|
||
}
|
||
/* FIXME length == 1 case */
|
||
else
|
||
{
|
||
SCM i = MAKMEMO_IF (memoize (CAR (clause), env),
|
||
memoize (scm_cons (scm_sym_begin, CDR (clause)), env),
|
||
MAKMEMO_QUOTE (SCM_UNSPECIFIED));
|
||
SCM_SETCDR (loc, i);
|
||
loc = scm_last_pair (SCM_MEMOIZED_ARGS (i));
|
||
}
|
||
}
|
||
|
||
return CDR (ret);
|
||
}
|
||
|
||
/* According to Section 5.2.1 of R5RS we first have to make sure that the
|
||
variable is bound, and then perform the `(set! variable expression)'
|
||
operation. However, EXPRESSION _can_ be evaluated before VARIABLE is
|
||
bound. This means that EXPRESSION won't necessarily be able to assign
|
||
values to VARIABLE as in `(define foo (begin (set! foo 1) (+ foo 1)))'. */
|
||
static SCM
|
||
scm_m_define (SCM expr, SCM env)
|
||
{
|
||
const SCM cdr_expr = CDR (expr);
|
||
SCM body;
|
||
SCM variable;
|
||
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
|
||
ASSERT_SYNTAX (!scm_is_pair (env), s_bad_define, expr);
|
||
|
||
body = CDR (cdr_expr);
|
||
variable = CAR (cdr_expr);
|
||
|
||
if (scm_is_pair (variable))
|
||
{
|
||
ASSERT_SYNTAX_2 (scm_is_symbol (CAR (variable)), s_bad_variable, variable, expr);
|
||
return MAKMEMO_DEFINE (CAR (variable),
|
||
memoize (scm_cons (scm_sym_lambda,
|
||
scm_cons (CDR (variable), body)),
|
||
env));
|
||
}
|
||
ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr);
|
||
ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr);
|
||
return MAKMEMO_DEFINE (variable, memoize (CAR (body), env));
|
||
}
|
||
|
||
static SCM
|
||
scm_m_with_fluids (SCM expr, SCM env)
|
||
{
|
||
SCM binds, fluids, vals;
|
||
ASSERT_SYNTAX (scm_ilength (expr) >= 3, s_bad_expression, expr);
|
||
binds = CADR (expr);
|
||
ASSERT_SYNTAX_2 (scm_ilength (binds) >= 0, s_bad_bindings, binds, expr);
|
||
for (fluids = SCM_EOL, vals = SCM_EOL;
|
||
scm_is_pair (binds);
|
||
binds = CDR (binds))
|
||
{
|
||
SCM binding = CAR (binds);
|
||
ASSERT_SYNTAX_2 (scm_ilength (CAR (binds)) == 2, s_bad_binding,
|
||
binding, expr);
|
||
fluids = scm_cons (memoize (CAR (binding), env), fluids);
|
||
vals = scm_cons (memoize (CADR (binding), env), vals);
|
||
}
|
||
|
||
return MAKMEMO_WITH_FLUIDS (scm_reverse_x (fluids, SCM_UNDEFINED),
|
||
scm_reverse_x (vals, SCM_UNDEFINED),
|
||
memoize_sequence (CDDR (expr), env));
|
||
}
|
||
|
||
static SCM
|
||
scm_m_eval_when (SCM expr, SCM env)
|
||
{
|
||
ASSERT_SYNTAX (scm_ilength (expr) >= 3, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (CADR (expr)) > 0, s_bad_expression, expr);
|
||
|
||
if (scm_is_true (scm_memq (sym_eval, CADR (expr)))
|
||
|| scm_is_true (scm_memq (sym_load, CADR (expr))))
|
||
return MAKMEMO_BEGIN (memoize_exprs (CDDR (expr), env));
|
||
else
|
||
return MAKMEMO_QUOTE (SCM_UNSPECIFIED);
|
||
}
|
||
|
||
static SCM
|
||
scm_m_if (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
const SCM cdr_expr = CDR (expr);
|
||
const long length = scm_ilength (cdr_expr);
|
||
ASSERT_SYNTAX (length == 2 || length == 3, s_expression, expr);
|
||
return MAKMEMO_IF (memoize (CADR (expr), env),
|
||
memoize (CADDR (expr), env),
|
||
((length == 3)
|
||
? memoize (CADDDR (expr), env)
|
||
: MAKMEMO_QUOTE (SCM_UNSPECIFIED)));
|
||
}
|
||
|
||
/* A helper function for memoize_lambda to support checking for duplicate
|
||
* formal arguments: Return true if OBJ is `eq?' to one of the elements of
|
||
* LIST or to the CDR of the last cons. Therefore, LIST may have any of the
|
||
* forms that a formal argument can have:
|
||
* <rest>, (<arg1> ...), (<arg1> ... . <rest>) */
|
||
static int
|
||
c_improper_memq (SCM obj, SCM list)
|
||
{
|
||
for (; scm_is_pair (list); list = CDR (list))
|
||
{
|
||
if (scm_is_eq (CAR (list), obj))
|
||
return 1;
|
||
}
|
||
return scm_is_eq (list, obj);
|
||
}
|
||
|
||
static SCM
|
||
scm_m_lambda (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
SCM formals;
|
||
SCM formals_idx;
|
||
SCM formal_vars = SCM_EOL;
|
||
SCM body;
|
||
int nreq = 0;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
const long length = scm_ilength (cdr_expr);
|
||
ASSERT_SYNTAX (length >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (length >= 2, s_missing_expression, expr);
|
||
|
||
/* Before iterating the list of formal arguments, make sure the formals
|
||
* actually are given as either a symbol or a non-cyclic list. */
|
||
formals = CAR (cdr_expr);
|
||
if (scm_is_pair (formals))
|
||
{
|
||
/* Dirk:FIXME:: We should check for a cyclic list of formals, and if
|
||
* detected, report a 'Bad formals' error. */
|
||
}
|
||
else
|
||
{
|
||
ASSERT_SYNTAX_2 (scm_is_symbol (formals) || scm_is_null (formals),
|
||
s_bad_formals, formals, expr);
|
||
}
|
||
|
||
/* Now iterate the list of formal arguments to check if all formals are
|
||
* symbols, and that there are no duplicates. */
|
||
formals_idx = formals;
|
||
while (scm_is_pair (formals_idx))
|
||
{
|
||
const SCM formal = CAR (formals_idx);
|
||
const SCM next_idx = CDR (formals_idx);
|
||
ASSERT_SYNTAX_2 (scm_is_symbol (formal), s_bad_formal, formal, expr);
|
||
ASSERT_SYNTAX_2 (!c_improper_memq (formal, next_idx),
|
||
s_duplicate_formal, formal, expr);
|
||
nreq++;
|
||
formal_vars = scm_cons (formal, formal_vars);
|
||
formals_idx = next_idx;
|
||
}
|
||
ASSERT_SYNTAX_2 (scm_is_null (formals_idx) || scm_is_symbol (formals_idx),
|
||
s_bad_formal, formals_idx, expr);
|
||
if (scm_is_symbol (formals_idx))
|
||
formal_vars = scm_cons (formals_idx, formal_vars);
|
||
|
||
body = memoize_sequence (CDDR (expr), memoize_env_extend (env, formal_vars));
|
||
|
||
if (scm_is_symbol (formals_idx))
|
||
return MAKMEMO_LAMBDA (body, REST_ARITY (nreq, SCM_BOOL_T));
|
||
else
|
||
return MAKMEMO_LAMBDA (body, FIXED_ARITY (nreq));
|
||
}
|
||
|
||
static SCM
|
||
scm_m_lambda_star (SCM expr, SCM env)
|
||
{
|
||
SCM req, opt, kw, allow_other_keys, rest, formals, body;
|
||
SCM inits, kw_indices;
|
||
int nreq, nopt;
|
||
|
||
const long length = scm_ilength (expr);
|
||
ASSERT_SYNTAX (length >= 1, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (length >= 3, s_missing_expression, expr);
|
||
|
||
formals = CADR (expr);
|
||
body = CDDR (expr);
|
||
|
||
nreq = nopt = 0;
|
||
req = opt = kw = SCM_EOL;
|
||
rest = allow_other_keys = SCM_BOOL_F;
|
||
|
||
while (scm_is_pair (formals) && scm_is_symbol (CAR (formals)))
|
||
{
|
||
nreq++;
|
||
req = scm_cons (CAR (formals), req);
|
||
formals = scm_cdr (formals);
|
||
}
|
||
|
||
if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_optional))
|
||
{
|
||
formals = CDR (formals);
|
||
while (scm_is_pair (formals)
|
||
&& (scm_is_symbol (CAR (formals)) || scm_is_pair (CAR (formals))))
|
||
{
|
||
nopt++;
|
||
opt = scm_cons (CAR (formals), opt);
|
||
formals = scm_cdr (formals);
|
||
}
|
||
}
|
||
|
||
if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_key))
|
||
{
|
||
formals = CDR (formals);
|
||
while (scm_is_pair (formals)
|
||
&& (scm_is_symbol (CAR (formals)) || scm_is_pair (CAR (formals))))
|
||
{
|
||
kw = scm_cons (CAR (formals), kw);
|
||
formals = scm_cdr (formals);
|
||
}
|
||
}
|
||
|
||
if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_allow_other_keys))
|
||
{
|
||
formals = CDR (formals);
|
||
allow_other_keys = SCM_BOOL_T;
|
||
}
|
||
|
||
if (scm_is_pair (formals) && scm_is_eq (CAR (formals), kw_rest))
|
||
{
|
||
if (scm_ilength (formals) != 2)
|
||
syntax_error (s_bad_formals, CADR (expr), expr);
|
||
else
|
||
rest = CADR (formals);
|
||
}
|
||
else if (scm_is_symbol (formals))
|
||
rest = formals;
|
||
else if (!scm_is_null (formals))
|
||
syntax_error (s_bad_formals, CADR (expr), expr);
|
||
else
|
||
rest = SCM_BOOL_F;
|
||
|
||
/* Now, iterate through them a second time, building up an expansion-time
|
||
environment, checking, expanding and canonicalizing the opt/kw init forms,
|
||
and eventually memoizing the body as well. Note that the rest argument, if
|
||
any, is expanded before keyword args, thus necessitating the second
|
||
pass.
|
||
|
||
Also note that the specific environment during expansion of init
|
||
expressions here needs to coincide with the environment when psyntax
|
||
expands. A lot of effort for something that is only used in the bootstrap
|
||
memoizer, you say? Yes. Yes it is.
|
||
*/
|
||
|
||
inits = SCM_EOL;
|
||
|
||
/* nreq is already set, and req is already reversed: simply extend. */
|
||
env = memoize_env_extend (env, req);
|
||
|
||
/* Build up opt inits and env */
|
||
opt = scm_reverse_x (opt, SCM_EOL);
|
||
while (scm_is_pair (opt))
|
||
{
|
||
SCM x = CAR (opt);
|
||
if (scm_is_symbol (x))
|
||
inits = scm_cons (MAKMEMO_QUOTE (SCM_BOOL_F), inits);
|
||
else if (scm_ilength (x) == 2 && scm_is_symbol (CAR (x)))
|
||
inits = scm_cons (memoize (CADR (x), env), inits);
|
||
else
|
||
syntax_error (s_bad_formals, CADR (expr), expr);
|
||
env = scm_cons (scm_is_symbol (x) ? x : CAR (x), env);
|
||
opt = CDR (opt);
|
||
}
|
||
|
||
/* Process rest before keyword args */
|
||
if (scm_is_true (rest))
|
||
env = scm_cons (rest, env);
|
||
|
||
/* Build up kw inits, env, and kw-indices alist */
|
||
if (scm_is_null (kw))
|
||
kw_indices = SCM_BOOL_F;
|
||
else
|
||
{
|
||
int idx = nreq + nopt + (scm_is_true (rest) ? 1 : 0);
|
||
|
||
kw_indices = SCM_EOL;
|
||
kw = scm_reverse_x (kw, SCM_EOL);
|
||
while (scm_is_pair (kw))
|
||
{
|
||
SCM x, sym, k, init;
|
||
x = CAR (kw);
|
||
if (scm_is_symbol (x))
|
||
{
|
||
sym = x;
|
||
init = SCM_BOOL_F;
|
||
k = scm_symbol_to_keyword (sym);
|
||
}
|
||
else if (scm_ilength (x) == 2 && scm_is_symbol (CAR (x)))
|
||
{
|
||
sym = CAR (x);
|
||
init = CADR (x);
|
||
k = scm_symbol_to_keyword (sym);
|
||
}
|
||
else if (scm_ilength (x) == 3 && scm_is_symbol (CAR (x))
|
||
&& scm_is_keyword (CADDR (x)))
|
||
{
|
||
sym = CAR (x);
|
||
init = CADR (x);
|
||
k = CADDR (x);
|
||
}
|
||
else
|
||
syntax_error (s_bad_formals, CADR (expr), expr);
|
||
|
||
kw_indices = scm_acons (k, SCM_I_MAKINUM (idx++), kw_indices);
|
||
inits = scm_cons (memoize (init, env), inits);
|
||
env = scm_cons (sym, env);
|
||
kw = CDR (kw);
|
||
}
|
||
kw_indices = scm_cons (allow_other_keys,
|
||
scm_reverse_x (kw_indices, SCM_UNDEFINED));
|
||
}
|
||
|
||
/* We should check for no duplicates, but given that psyntax does this
|
||
already, we can punt on it here... */
|
||
|
||
inits = scm_reverse_x (inits, SCM_UNDEFINED);
|
||
body = memoize_sequence (body, env);
|
||
|
||
if (scm_is_false (kw_indices) && scm_is_false (rest) && !nopt)
|
||
return MAKMEMO_LAMBDA (body, FIXED_ARITY (nreq));
|
||
if (scm_is_false (kw_indices) && !nopt)
|
||
return MAKMEMO_LAMBDA (body, REST_ARITY (nreq, SCM_BOOL_T));
|
||
else
|
||
return MAKMEMO_LAMBDA (body, FULL_ARITY (nreq, rest, nopt, kw_indices, inits,
|
||
SCM_BOOL_F));
|
||
}
|
||
|
||
/* Check if the format of the bindings is ((<symbol> <init-form>) ...). */
|
||
static void
|
||
check_bindings (const SCM bindings, const SCM expr)
|
||
{
|
||
SCM binding_idx;
|
||
|
||
ASSERT_SYNTAX_2 (scm_ilength (bindings) >= 0,
|
||
s_bad_bindings, bindings, expr);
|
||
|
||
binding_idx = bindings;
|
||
for (; !scm_is_null (binding_idx); binding_idx = CDR (binding_idx))
|
||
{
|
||
SCM name; /* const */
|
||
|
||
const SCM binding = CAR (binding_idx);
|
||
ASSERT_SYNTAX_2 (scm_ilength (binding) == 2,
|
||
s_bad_binding, binding, expr);
|
||
|
||
name = CAR (binding);
|
||
ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr);
|
||
}
|
||
}
|
||
|
||
/* The bindings, which must have the format ((v1 i1) (v2 i2) ... (vn in)), are
|
||
* transformed to the lists (vn .. v2 v1) and (i1 i2 ... in). If a duplicate
|
||
* variable name is detected, an error is signalled. */
|
||
static int
|
||
transform_bindings (const SCM bindings, const SCM expr,
|
||
SCM *const rvarptr, SCM *const initptr)
|
||
{
|
||
SCM rvariables = SCM_EOL;
|
||
SCM rinits = SCM_EOL;
|
||
SCM binding_idx = bindings;
|
||
int n = 0;
|
||
for (; !scm_is_null (binding_idx); binding_idx = CDR (binding_idx))
|
||
{
|
||
const SCM binding = CAR (binding_idx);
|
||
const SCM CDR_binding = CDR (binding);
|
||
const SCM name = CAR (binding);
|
||
ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rvariables)),
|
||
s_duplicate_binding, name, expr);
|
||
rvariables = scm_cons (name, rvariables);
|
||
rinits = scm_cons (CAR (CDR_binding), rinits);
|
||
n++;
|
||
}
|
||
*rvarptr = rvariables;
|
||
*initptr = scm_reverse_x (rinits, SCM_UNDEFINED);
|
||
return n;
|
||
}
|
||
|
||
/* This function is a helper function for memoize_let. It transforms
|
||
* (let name ((var init) ...) body ...) into
|
||
* ((letrec ((name (lambda (var ...) body ...))) name) init ...)
|
||
* and memoizes the expression. It is assumed that the caller has checked
|
||
* that name is a symbol and that there are bindings and a body. */
|
||
static SCM
|
||
memoize_named_let (const SCM expr, SCM env)
|
||
{
|
||
SCM rvariables;
|
||
SCM inits;
|
||
int nreq;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
const SCM name = CAR (cdr_expr);
|
||
const SCM cddr_expr = CDR (cdr_expr);
|
||
const SCM bindings = CAR (cddr_expr);
|
||
check_bindings (bindings, expr);
|
||
|
||
nreq = transform_bindings (bindings, expr, &rvariables, &inits);
|
||
|
||
env = scm_cons (name, env);
|
||
return MAKMEMO_LET
|
||
(scm_list_1 (MAKMEMO_QUOTE (SCM_UNDEFINED)),
|
||
MAKMEMO_BEGIN
|
||
(scm_list_2 (MAKMEMO_LEX_SET
|
||
(0,
|
||
MAKMEMO_LAMBDA (memoize_sequence
|
||
(CDDDR (expr),
|
||
memoize_env_extend (env, rvariables)),
|
||
FIXED_ARITY (nreq))),
|
||
MAKMEMO_CALL (MAKMEMO_LEX_REF (0),
|
||
nreq,
|
||
memoize_exprs (inits, env)))));
|
||
}
|
||
|
||
/* (let ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers
|
||
* i1 .. in is transformed to (#@let (vn ... v2 v1) (i1 i2 ...) body). */
|
||
static SCM
|
||
scm_m_let (SCM expr, SCM env)
|
||
{
|
||
SCM bindings;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
const long length = scm_ilength (cdr_expr);
|
||
ASSERT_SYNTAX (length >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (length >= 2, s_missing_expression, expr);
|
||
|
||
bindings = CAR (cdr_expr);
|
||
if (scm_is_symbol (bindings))
|
||
{
|
||
ASSERT_SYNTAX (length >= 3, s_missing_expression, expr);
|
||
return memoize_named_let (expr, env);
|
||
}
|
||
|
||
check_bindings (bindings, expr);
|
||
if (scm_is_null (bindings))
|
||
return memoize_sequence (CDDR (expr), env);
|
||
else
|
||
{
|
||
SCM rvariables;
|
||
SCM inits;
|
||
transform_bindings (bindings, expr, &rvariables, &inits);
|
||
return MAKMEMO_LET (memoize_exprs (inits, env),
|
||
memoize_sequence (CDDR (expr),
|
||
memoize_env_extend (env, rvariables)));
|
||
}
|
||
}
|
||
|
||
static SCM
|
||
scm_m_letrec (SCM expr, SCM env)
|
||
{
|
||
SCM bindings;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
|
||
|
||
bindings = CAR (cdr_expr);
|
||
if (scm_is_null (bindings))
|
||
return memoize_sequence (CDDR (expr), env);
|
||
else
|
||
{
|
||
SCM rvariables;
|
||
SCM inits;
|
||
SCM v, i;
|
||
SCM undefs = SCM_EOL;
|
||
SCM vals = SCM_EOL;
|
||
SCM sets = SCM_EOL;
|
||
SCM new_env;
|
||
int offset;
|
||
int n = transform_bindings (bindings, expr, &rvariables, &inits);
|
||
offset = n;
|
||
new_env = memoize_env_extend (env, rvariables);
|
||
for (v = scm_reverse (rvariables), i = inits; scm_is_pair (v);
|
||
v = CDR (v), i = CDR (i), n--)
|
||
{
|
||
undefs = scm_cons (MAKMEMO_QUOTE (SCM_UNDEFINED), undefs);
|
||
vals = scm_cons (memoize (CAR (i), new_env), vals);
|
||
sets = scm_cons (MAKMEMO_LEX_SET ((n-1) + offset,
|
||
MAKMEMO_LEX_REF (n-1)),
|
||
sets);
|
||
}
|
||
return MAKMEMO_LET
|
||
(undefs,
|
||
MAKMEMO_BEGIN (scm_list_2 (MAKMEMO_LET (scm_reverse (vals),
|
||
MAKMEMO_BEGIN (sets)),
|
||
memoize_sequence (CDDR (expr),
|
||
new_env))));
|
||
}
|
||
}
|
||
|
||
static SCM
|
||
scm_m_letstar (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
SCM bindings;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
|
||
|
||
bindings = CAR (cdr_expr);
|
||
if (scm_is_null (bindings))
|
||
return memoize_sequence (CDDR (expr), env);
|
||
else
|
||
{
|
||
SCM rvariables;
|
||
SCM variables;
|
||
SCM inits;
|
||
SCM ret, loc;
|
||
transform_bindings (bindings, expr, &rvariables, &inits);
|
||
variables = scm_reverse (rvariables);
|
||
ret = scm_cons (SCM_UNDEFINED, SCM_UNSPECIFIED);
|
||
loc = ret;
|
||
for (; scm_is_pair (variables);
|
||
variables = CDR (variables), inits = CDR (inits))
|
||
{ SCM x = MAKMEMO_LET (scm_list_1 (memoize (CAR (inits), env)),
|
||
MAKMEMO_QUOTE (SCM_UNSPECIFIED));
|
||
SCM_SETCDR (loc, x);
|
||
loc = scm_last_pair (SCM_MEMOIZED_ARGS (x));
|
||
env = scm_cons (CAR (variables), env);
|
||
}
|
||
SCM_SETCDR (loc, memoize_sequence (CDDR (expr), env));
|
||
return CDR (ret);
|
||
}
|
||
}
|
||
|
||
static SCM
|
||
scm_m_or (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
SCM tail = CDR (expr);
|
||
SCM ret, loc;
|
||
const long length = scm_ilength (tail);
|
||
|
||
ASSERT_SYNTAX (length >= 0, s_bad_expression, expr);
|
||
|
||
ret = scm_cons (SCM_UNDEFINED, SCM_UNSPECIFIED);
|
||
loc = ret;
|
||
for (; scm_is_pair (tail); tail = CDR (tail))
|
||
{
|
||
SCM tmp = scm_gensym (scm_from_locale_string ("cond "));
|
||
SCM x = MAKMEMO_IF (MAKMEMO_LEX_REF (0),
|
||
MAKMEMO_LEX_REF (0),
|
||
MAKMEMO_QUOTE (SCM_UNSPECIFIED));
|
||
SCM new_env = scm_cons (tmp, env);
|
||
SCM_SETCDR (loc, MAKMEMO_LET (scm_list_1 (memoize (CAR (tail),
|
||
env)),
|
||
x));
|
||
env = new_env;
|
||
loc = scm_last_pair (SCM_MEMOIZED_ARGS (x));
|
||
}
|
||
SCM_SETCDR (loc, MAKMEMO_QUOTE (SCM_BOOL_F));
|
||
return CDR (ret);
|
||
}
|
||
|
||
static SCM
|
||
scm_m_quote (SCM expr, SCM env SCM_UNUSED)
|
||
{
|
||
SCM quotee;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr);
|
||
quotee = CAR (cdr_expr);
|
||
return MAKMEMO_QUOTE (quotee);
|
||
}
|
||
|
||
static SCM
|
||
scm_m_set_x (SCM expr, SCM env)
|
||
{
|
||
SCM variable;
|
||
SCM vmem;
|
||
|
||
const SCM cdr_expr = CDR (expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
|
||
ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr);
|
||
variable = CAR (cdr_expr);
|
||
vmem = memoize (variable, env);
|
||
|
||
switch (SCM_MEMOIZED_TAG (vmem))
|
||
{
|
||
case SCM_M_LEXICAL_REF:
|
||
return MAKMEMO_LEX_SET (SCM_I_INUM (SCM_MEMOIZED_ARGS (vmem)),
|
||
memoize (CADDR (expr), env));
|
||
case SCM_M_TOPLEVEL_REF:
|
||
return MAKMEMO_TOP_SET (variable,
|
||
memoize (CADDR (expr), env));
|
||
case SCM_M_MODULE_REF:
|
||
return MAKMEMO_MOD_SET (memoize (CADDR (expr), env),
|
||
CAR (SCM_MEMOIZED_ARGS (vmem)),
|
||
CADR (SCM_MEMOIZED_ARGS (vmem)),
|
||
CDDR (SCM_MEMOIZED_ARGS (vmem)));
|
||
default:
|
||
syntax_error (s_bad_variable, variable, expr);
|
||
}
|
||
}
|
||
|
||
|
||
|
||
|
||
SCM_DEFINE (scm_memoize_expression, "memoize-expression", 1, 0, 0,
|
||
(SCM exp),
|
||
"Memoize the expression @var{exp}.")
|
||
#define FUNC_NAME s_scm_memoize_expression
|
||
{
|
||
return memoize (exp, scm_current_module ());
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
|
||
|
||
|
||
#define SCM_MAKE_MEMOIZER(STR, MEMOIZER, N) \
|
||
(scm_cell (scm_tc16_memoizer, \
|
||
(scm_t_bits)(scm_c_make_gsubr (STR, N, 0, 0, MEMOIZER))))
|
||
#define SCM_DEFINE_MEMOIZER(STR, MEMOIZER, N) \
|
||
SCM_SNARF_INIT(scm_c_define (STR, SCM_MAKE_MEMOIZER (STR, MEMOIZER, N)))
|
||
|
||
static SCM m_apply (SCM proc, SCM args);
|
||
static SCM m_call_cc (SCM proc);
|
||
static SCM m_call_values (SCM prod, SCM cons);
|
||
static SCM m_dynamic_wind (SCM pre, SCM exp, SCM post);
|
||
static SCM m_prompt (SCM tag, SCM exp, SCM handler);
|
||
|
||
SCM_DEFINE_MEMOIZER ("@apply", m_apply, 2);
|
||
SCM_DEFINE_MEMOIZER ("@call-with-current-continuation", m_call_cc, 1);
|
||
SCM_DEFINE_MEMOIZER ("@call-with-values", m_call_values, 2);
|
||
SCM_DEFINE_MEMOIZER ("@dynamic-wind", m_dynamic_wind, 3);
|
||
SCM_DEFINE_MEMOIZER ("@prompt", m_prompt, 3);
|
||
|
||
|
||
|
||
|
||
static SCM m_apply (SCM proc, SCM args)
|
||
#define FUNC_NAME "@apply"
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, proc);
|
||
SCM_VALIDATE_MEMOIZED (2, args);
|
||
return MAKMEMO_APPLY (proc, args);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
static SCM m_call_cc (SCM proc)
|
||
#define FUNC_NAME "@call-with-current-continuation"
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, proc);
|
||
return MAKMEMO_CONT (proc);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
static SCM m_call_values (SCM prod, SCM cons)
|
||
#define FUNC_NAME "@call-with-values"
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, prod);
|
||
SCM_VALIDATE_MEMOIZED (2, cons);
|
||
return MAKMEMO_CALL_WITH_VALUES (prod, cons);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
static SCM m_dynamic_wind (SCM in, SCM expr, SCM out)
|
||
#define FUNC_NAME "memoize-dynwind"
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, in);
|
||
SCM_VALIDATE_MEMOIZED (2, expr);
|
||
SCM_VALIDATE_MEMOIZED (3, out);
|
||
return MAKMEMO_DYNWIND (in, expr, out);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
static SCM m_prompt (SCM tag, SCM exp, SCM handler)
|
||
#define FUNC_NAME "@prompt"
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, tag);
|
||
SCM_VALIDATE_MEMOIZED (2, exp);
|
||
SCM_VALIDATE_MEMOIZED (3, handler);
|
||
return MAKMEMO_PROMPT (tag, exp, handler);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoizer_p, "memoizer?", 1, 0, 0,
|
||
(SCM x), "")
|
||
{
|
||
return scm_from_bool (SCM_MEMOIZER_P (x));
|
||
}
|
||
|
||
SCM_DEFINE (scm_memoizer, "memoizer", 1, 0, 0,
|
||
(SCM memoizer), "")
|
||
{
|
||
SCM_ASSERT (SCM_MEMOIZER_P (memoizer), memoizer, 1, "memoizer?");
|
||
return SCM_MEMOIZER (memoizer);
|
||
}
|
||
|
||
|
||
|
||
|
||
#define SCM_VALIDATE_MEMOIZED_LIST(n, exps) \
|
||
{ \
|
||
SCM walk; \
|
||
for (walk = exps; scm_is_pair (walk); walk = scm_cdr (walk)) \
|
||
SCM_ASSERT (SCM_MEMOIZED_P (scm_car (walk)), exps, n, FUNC_NAME); \
|
||
SCM_ASSERT (scm_is_null (walk), exps, n, FUNC_NAME); \
|
||
}
|
||
|
||
SCM_DEFINE (scm_memoize_begin, "memoize-begin", 1, 0, 0,
|
||
(SCM exps), "")
|
||
#define FUNC_NAME s_scm_memoize_begin
|
||
{
|
||
SCM_VALIDATE_MEMOIZED_LIST (1, exps);
|
||
return MAKMEMO_BEGIN (exps);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_if, "memoize-if", 3, 0, 0,
|
||
(SCM test, SCM then, SCM else_), "")
|
||
#define FUNC_NAME s_scm_memoize_if
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, test);
|
||
SCM_VALIDATE_MEMOIZED (2, then);
|
||
SCM_VALIDATE_MEMOIZED (3, else_);
|
||
return MAKMEMO_IF (test, then, else_);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_lambda, "memoize-lambda", 3, 0, 0,
|
||
(SCM nreq, SCM rest, SCM body), "")
|
||
#define FUNC_NAME s_scm_memoize_lambda
|
||
{
|
||
SCM_VALIDATE_BOOL (2, rest);
|
||
SCM_VALIDATE_MEMOIZED (3, body);
|
||
return MAKMEMO_LAMBDA (body, REST_ARITY (scm_to_uint16 (nreq), rest));
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_let, "memoize-let", 2, 0, 0,
|
||
(SCM inits, SCM body), "")
|
||
#define FUNC_NAME s_scm_memoize_let
|
||
{
|
||
SCM_VALIDATE_MEMOIZED_LIST (1, inits);
|
||
SCM_VALIDATE_MEMOIZED (2, body);
|
||
return MAKMEMO_LET (inits, body);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_quote, "memoize-quote", 1, 0, 0,
|
||
(SCM exp), "")
|
||
#define FUNC_NAME s_scm_memoize_quote
|
||
{
|
||
return MAKMEMO_QUOTE (exp);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_define, "memoize-define", 2, 0, 0,
|
||
(SCM var, SCM val), "")
|
||
#define FUNC_NAME s_scm_memoize_define
|
||
{
|
||
SCM_VALIDATE_SYMBOL (1, var);
|
||
SCM_VALIDATE_MEMOIZED (2, val);
|
||
return MAKMEMO_DEFINE (var, val);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_with_fluids, "memoize-with-fluids", 3, 0, 0,
|
||
(SCM fluids, SCM vals, SCM expr), "")
|
||
#define FUNC_NAME s_scm_memoize_with_fluids
|
||
{
|
||
SCM_VALIDATE_MEMOIZED_LIST (1, fluids);
|
||
SCM_VALIDATE_MEMOIZED_LIST (2, vals);
|
||
SCM_ASSERT (scm_ilength (fluids) == scm_ilength (vals), vals, 2, FUNC_NAME);
|
||
SCM_VALIDATE_MEMOIZED (3, expr);
|
||
return MAKMEMO_WITH_FLUIDS (fluids, vals, expr);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_call, "memoize-call", 3, 0, 0,
|
||
(SCM proc, SCM nargs, SCM args), "")
|
||
#define FUNC_NAME s_scm_memoize_call
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, proc);
|
||
SCM_VALIDATE_MEMOIZED_LIST (3, args);
|
||
return MAKMEMO_CALL (proc, scm_to_uint16 (nargs), args);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_lexical_ref, "memoize-lexical-ref", 1, 0, 0,
|
||
(SCM n), "")
|
||
#define FUNC_NAME s_scm_memoize_lexical_ref
|
||
{
|
||
return MAKMEMO_LEX_REF (scm_to_uint16 (n));
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_lexical_set, "memoize-lexical-set!", 2, 0, 0,
|
||
(SCM n, SCM val), "")
|
||
#define FUNC_NAME s_scm_memoize_lexical_set
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, val);
|
||
return MAKMEMO_LEX_SET (n, val);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_toplevel_ref, "memoize-toplevel-ref", 1, 0, 0,
|
||
(SCM var), "")
|
||
#define FUNC_NAME s_scm_memoize_toplevel_ref
|
||
{
|
||
SCM_VALIDATE_SYMBOL (1, var);
|
||
return MAKMEMO_TOP_REF (var);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_toplevel_set, "memoize-toplevel-set!", 2, 0, 0,
|
||
(SCM var, SCM val), "")
|
||
#define FUNC_NAME s_scm_memoize_toplevel_set
|
||
{
|
||
SCM_VALIDATE_SYMBOL (1, var);
|
||
SCM_VALIDATE_MEMOIZED (2, val);
|
||
return MAKMEMO_TOP_SET (var, val);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_module_ref, "memoize-module-ref", 3, 0, 0,
|
||
(SCM mod, SCM var, SCM public), "")
|
||
#define FUNC_NAME s_scm_memoize_module_ref
|
||
{
|
||
SCM_VALIDATE_SYMBOL (2, var);
|
||
SCM_VALIDATE_BOOL (3, public);
|
||
return MAKMEMO_MOD_REF (mod, var, public);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoize_module_set, "memoize-module-set!", 4, 0, 0,
|
||
(SCM val, SCM mod, SCM var, SCM public), "")
|
||
#define FUNC_NAME s_scm_memoize_module_set
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, val);
|
||
SCM_VALIDATE_SYMBOL (3, var);
|
||
SCM_VALIDATE_BOOL (4, public);
|
||
return MAKMEMO_MOD_SET (val, mod, var, public);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
|
||
|
||
|
||
SCM_SYMBOL (sym_placeholder, "_");
|
||
|
||
static SCM unmemoize (SCM expr);
|
||
|
||
static SCM
|
||
unmemoize_exprs (SCM exprs)
|
||
{
|
||
SCM ret, tail;
|
||
if (scm_is_null (exprs))
|
||
return SCM_EOL;
|
||
ret = scm_list_1 (unmemoize (CAR (exprs)));
|
||
tail = ret;
|
||
for (exprs = CDR (exprs); !scm_is_null (exprs); exprs = CDR (exprs))
|
||
{
|
||
SCM_SETCDR (tail, scm_list_1 (unmemoize (CAR (exprs))));
|
||
tail = CDR (tail);
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static SCM
|
||
unmemoize_bindings (SCM inits)
|
||
{
|
||
SCM ret, tail;
|
||
if (scm_is_null (inits))
|
||
return SCM_EOL;
|
||
ret = scm_list_1 (scm_list_2 (sym_placeholder, unmemoize (CAR (inits))));
|
||
tail = ret;
|
||
for (inits = CDR (inits); !scm_is_null (inits); inits = CDR (inits))
|
||
{
|
||
SCM_SETCDR (tail, scm_list_1 (scm_list_2 (sym_placeholder,
|
||
unmemoize (CAR (inits)))));
|
||
tail = CDR (tail);
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static SCM
|
||
unmemoize_lexical (SCM n)
|
||
{
|
||
char buf[16];
|
||
buf[15] = 0;
|
||
snprintf (buf, 15, "<%u>", scm_to_uint32 (n));
|
||
return scm_from_locale_symbol (buf);
|
||
}
|
||
|
||
static SCM
|
||
unmemoize (const SCM expr)
|
||
{
|
||
SCM args;
|
||
|
||
if (!SCM_MEMOIZED_P (expr))
|
||
abort ();
|
||
|
||
args = SCM_MEMOIZED_ARGS (expr);
|
||
switch (SCM_MEMOIZED_TAG (expr))
|
||
{
|
||
case SCM_M_APPLY:
|
||
return scm_cons (scm_sym_atapply, unmemoize_exprs (args));
|
||
case SCM_M_BEGIN:
|
||
return scm_cons (scm_sym_begin, unmemoize_exprs (args));
|
||
case SCM_M_CALL:
|
||
return scm_cons (unmemoize (CAR (args)), unmemoize_exprs (CDDR (args)));
|
||
case SCM_M_CONT:
|
||
return scm_list_2 (scm_sym_atcall_cc, unmemoize (args));
|
||
case SCM_M_CALL_WITH_VALUES:
|
||
return scm_list_3 (scm_sym_at_call_with_values,
|
||
unmemoize (CAR (args)), unmemoize (CDR (args)));
|
||
case SCM_M_DEFINE:
|
||
return scm_list_3 (scm_sym_define, CAR (args), unmemoize (CDR (args)));
|
||
case SCM_M_DYNWIND:
|
||
return scm_list_4 (scm_sym_at_dynamic_wind,
|
||
unmemoize (CAR (args)),
|
||
unmemoize (CADR (args)),
|
||
unmemoize (CDDR (args)));
|
||
case SCM_M_WITH_FLUIDS:
|
||
{
|
||
SCM binds = SCM_EOL, fluids, vals;
|
||
for (fluids = CAR (args), vals = CADR (args); scm_is_pair (fluids);
|
||
fluids = CDR (fluids), vals = CDR (vals))
|
||
binds = scm_cons (scm_list_2 (unmemoize (CAR (fluids)),
|
||
unmemoize (CAR (vals))),
|
||
binds);
|
||
return scm_list_3 (scm_sym_with_fluids,
|
||
scm_reverse_x (binds, SCM_UNDEFINED),
|
||
unmemoize (CDDR (args)));
|
||
}
|
||
case SCM_M_IF:
|
||
return scm_list_4 (scm_sym_if, unmemoize (scm_car (args)),
|
||
unmemoize (scm_cadr (args)), unmemoize (scm_cddr (args)));
|
||
case SCM_M_LAMBDA:
|
||
if (scm_is_null (CDDR (args)))
|
||
return scm_list_3 (scm_sym_lambda,
|
||
scm_make_list (CADR (args), sym_placeholder),
|
||
unmemoize (CAR (args)));
|
||
else if (scm_is_null (CDDDR (args)))
|
||
{
|
||
SCM formals = scm_make_list (CADR (args), sym_placeholder);
|
||
return scm_list_3 (scm_sym_lambda,
|
||
scm_is_true (CADDR (args))
|
||
? scm_cons_star (sym_placeholder, formals)
|
||
: formals,
|
||
unmemoize (CAR (args)));
|
||
}
|
||
else
|
||
{
|
||
SCM body = CAR (args), spec = CDR (args), alt;
|
||
|
||
alt = CADDR (CDDDR (spec));
|
||
if (scm_is_true (alt))
|
||
abort ();
|
||
|
||
return scm_list_3 (sym_lambda_star,
|
||
scm_list_5 (CAR (spec),
|
||
CADR (spec),
|
||
CADDR (spec),
|
||
CADDDR (spec),
|
||
unmemoize_exprs (CADR (CDDDR (spec)))),
|
||
unmemoize (body));
|
||
}
|
||
case SCM_M_LET:
|
||
return scm_list_3 (scm_sym_let,
|
||
unmemoize_bindings (CAR (args)),
|
||
unmemoize (CDR (args)));
|
||
case SCM_M_QUOTE:
|
||
return scm_list_2 (scm_sym_quote, args);
|
||
case SCM_M_LEXICAL_REF:
|
||
return unmemoize_lexical (args);
|
||
case SCM_M_LEXICAL_SET:
|
||
return scm_list_3 (scm_sym_set_x, unmemoize_lexical (CAR (args)),
|
||
unmemoize (CDR (args)));
|
||
case SCM_M_TOPLEVEL_REF:
|
||
return args;
|
||
case SCM_M_TOPLEVEL_SET:
|
||
return scm_list_3 (scm_sym_set_x, CAR (args), unmemoize (CDR (args)));
|
||
case SCM_M_MODULE_REF:
|
||
return SCM_VARIABLEP (args) ? args
|
||
: scm_list_3 (scm_is_true (CDDR (args)) ? scm_sym_at : scm_sym_atat,
|
||
scm_i_finite_list_copy (CAR (args)),
|
||
CADR (args));
|
||
case SCM_M_MODULE_SET:
|
||
return scm_list_3 (scm_sym_set_x,
|
||
SCM_VARIABLEP (CDR (args)) ? CDR (args)
|
||
: scm_list_3 (scm_is_true (CDDDR (args))
|
||
? scm_sym_at : scm_sym_atat,
|
||
scm_i_finite_list_copy (CADR (args)),
|
||
CADDR (args)),
|
||
unmemoize (CAR (args)));
|
||
case SCM_M_PROMPT:
|
||
return scm_list_4 (scm_sym_at_prompt,
|
||
unmemoize (CAR (args)),
|
||
unmemoize (CADR (args)),
|
||
unmemoize (CDDR (args)));
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
|
||
|
||
|
||
|
||
SCM_DEFINE (scm_memoized_p, "memoized?", 1, 0, 0,
|
||
(SCM obj),
|
||
"Return @code{#t} if @var{obj} is memoized.")
|
||
#define FUNC_NAME s_scm_memoized_p
|
||
{
|
||
return scm_from_bool (SCM_MEMOIZED_P (obj));
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_unmemoize_expression, "unmemoize-expression", 1, 0, 0,
|
||
(SCM m),
|
||
"Unmemoize the memoized expression @var{m}.")
|
||
#define FUNC_NAME s_scm_unmemoize_expression
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, m);
|
||
return unmemoize (m);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoized_expression_typecode, "memoized-expression-typecode", 1, 0, 0,
|
||
(SCM m),
|
||
"Return the typecode from the memoized expression @var{m}.")
|
||
#define FUNC_NAME s_scm_memoized_expression_typecode
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, m);
|
||
|
||
/* The tag is a 16-bit integer so it fits in an inum. */
|
||
return SCM_I_MAKINUM (SCM_MEMOIZED_TAG (m));
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoized_expression_data, "memoized-expression-data", 1, 0, 0,
|
||
(SCM m),
|
||
"Return the data from the memoized expression @var{m}.")
|
||
#define FUNC_NAME s_scm_memoized_expression_data
|
||
{
|
||
SCM_VALIDATE_MEMOIZED (1, m);
|
||
return SCM_MEMOIZED_ARGS (m);
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_DEFINE (scm_memoized_typecode, "memoized-typecode", 1, 0, 0,
|
||
(SCM sym),
|
||
"Return the memoized typecode corresponding to the symbol @var{sym}.")
|
||
#define FUNC_NAME s_scm_memoized_typecode
|
||
{
|
||
int i;
|
||
|
||
SCM_VALIDATE_SYMBOL (1, sym);
|
||
|
||
for (i = 0; i < sizeof(memoized_tags)/sizeof(const char*); i++)
|
||
if (strcmp (scm_i_symbol_chars (sym), memoized_tags[i]) == 0)
|
||
return scm_from_int32 (i);
|
||
|
||
return SCM_BOOL_F;
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable");
|
||
static void error_unbound_variable (SCM symbol) SCM_NORETURN;
|
||
static void error_unbound_variable (SCM symbol)
|
||
{
|
||
scm_error (scm_unbound_variable_key, NULL, "Unbound variable: ~S",
|
||
scm_list_1 (symbol), SCM_BOOL_F);
|
||
}
|
||
|
||
SCM_DEFINE (scm_memoize_variable_access_x, "memoize-variable-access!", 2, 0, 0,
|
||
(SCM m, SCM mod),
|
||
"Look up and cache the variable that @var{m} will access, returning the variable.")
|
||
#define FUNC_NAME s_scm_memoize_variable_access_x
|
||
{
|
||
SCM mx;
|
||
SCM_VALIDATE_MEMOIZED (1, m);
|
||
mx = SCM_MEMOIZED_ARGS (m);
|
||
switch (SCM_MEMOIZED_TAG (m))
|
||
{
|
||
case SCM_M_TOPLEVEL_REF:
|
||
if (SCM_VARIABLEP (mx))
|
||
return mx;
|
||
else
|
||
{
|
||
SCM var = scm_module_variable (mod, mx);
|
||
if (scm_is_false (var) || scm_is_false (scm_variable_bound_p (var)))
|
||
error_unbound_variable (mx);
|
||
SCM_SET_SMOB_OBJECT (m, var);
|
||
return var;
|
||
}
|
||
|
||
case SCM_M_TOPLEVEL_SET:
|
||
{
|
||
SCM var = CAR (mx);
|
||
if (SCM_VARIABLEP (var))
|
||
return var;
|
||
else
|
||
{
|
||
var = scm_module_variable (mod, var);
|
||
if (scm_is_false (var))
|
||
error_unbound_variable (CAR (mx));
|
||
SCM_SETCAR (mx, var);
|
||
return var;
|
||
}
|
||
}
|
||
|
||
case SCM_M_MODULE_REF:
|
||
if (SCM_VARIABLEP (mx))
|
||
return mx;
|
||
else
|
||
{
|
||
SCM var;
|
||
mod = scm_resolve_module (CAR (mx));
|
||
if (scm_is_true (CDDR (mx)))
|
||
mod = scm_module_public_interface (mod);
|
||
var = scm_module_lookup (mod, CADR (mx));
|
||
if (scm_is_false (scm_variable_bound_p (var)))
|
||
error_unbound_variable (CADR (mx));
|
||
SCM_SET_SMOB_OBJECT (m, var);
|
||
return var;
|
||
}
|
||
|
||
case SCM_M_MODULE_SET:
|
||
/* FIXME: not quite threadsafe */
|
||
if (SCM_VARIABLEP (CDR (mx)))
|
||
return CDR (mx);
|
||
else
|
||
{
|
||
SCM var;
|
||
mod = scm_resolve_module (CADR (mx));
|
||
if (scm_is_true (CDDDR (mx)))
|
||
mod = scm_module_public_interface (mod);
|
||
var = scm_module_lookup (mod, CADDR (mx));
|
||
SCM_SETCDR (mx, var);
|
||
return var;
|
||
}
|
||
|
||
default:
|
||
scm_wrong_type_arg (FUNC_NAME, 1, m);
|
||
return SCM_BOOL_F;
|
||
}
|
||
}
|
||
#undef FUNC_NAME
|
||
|
||
|
||
|
||
|
||
void
|
||
scm_init_memoize ()
|
||
{
|
||
scm_tc16_memoized = scm_make_smob_type ("%memoized", 0);
|
||
scm_set_smob_mark (scm_tc16_memoized, scm_markcdr);
|
||
scm_set_smob_print (scm_tc16_memoized, scm_print_memoized);
|
||
|
||
scm_tc16_memoizer = scm_make_smob_type ("memoizer", 0);
|
||
|
||
#include "libguile/memoize.x"
|
||
|
||
scm_c_define ("macroexpand",
|
||
scm_variable_ref (scm_c_lookup ("memoize-expression")));
|
||
}
|
||
|
||
/*
|
||
Local Variables:
|
||
c-file-style: "gnu"
|
||
End:
|
||
*/
|