-/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006
+ * Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
\f
-/* 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:".
- */
+#define _GNU_SOURCE
+
+/* This file is read twice in order to produce debugging versions of ceval and
+ * scm_apply. These functions, 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
-/* 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
+/* This blob per the Autoconf manual (under "Particular Functions"). */
+#if HAVE_ALLOCA_H
+# include <alloca.h>
+#elif defined __GNUC__
+# define alloca __builtin_alloca
+#elif defined _AIX
+# define alloca __alloca
+#elif defined _MSC_VER
+# include <malloc.h>
+# define alloca _alloca
+#else
+# include <stddef.h>
+# ifdef __cplusplus
+extern "C"
# endif
+void *alloca (size_t);
#endif
+#include <assert.h>
#include "libguile/_scm.h"
#include "libguile/alist.h"
#include "libguile/async.h"
#include "libguile/continuations.h"
#include "libguile/debug.h"
+#include "libguile/deprecation.h"
#include "libguile/dynwind.h"
#include "libguile/eq.h"
#include "libguile/feature.h"
#include "libguile/modules.h"
#include "libguile/objects.h"
#include "libguile/ports.h"
+#include "libguile/print.h"
#include "libguile/procprop.h"
#include "libguile/root.h"
#include "libguile/smob.h"
#include "libguile/srcprop.h"
#include "libguile/stackchk.h"
#include "libguile/strings.h"
+#include "libguile/threads.h"
#include "libguile/throw.h"
#include "libguile/validate.h"
#include "libguile/values.h"
\f
+static SCM unmemoize_exprs (SCM expr, SCM env);
+static SCM canonicalize_define (SCM expr);
+static SCM *scm_lookupcar1 (SCM vloc, SCM genv, int check);
+static SCM unmemoize_builtin_macro (SCM expr, SCM env);
+static void eval_letrec_inits (SCM env, SCM init_forms, SCM **init_values_eol);
+
+\f
+
/* {Syntax Errors}
*
* This section defines the message strings for the syntax errors that can be
* expression is expected, a 'Bad expression' error is signalled. */
static const char s_bad_expression[] = "Bad expression";
+/* If a form is detected that holds a different number of expressions than are
+ * required in that context, a 'Missing or extra expression' error is
+ * signalled. */
+static const char s_expression[] = "Missing or extra expression in";
+
/* If a form is detected that holds less expressions than are required in that
* context, a 'Missing expression' error is signalled. */
static const char s_missing_expression[] = "Missing expression in";
* context, an 'Extra expression' error is signalled. */
static const char s_extra_expression[] = "Extra expression in";
+/* The empty combination '()' is not allowed as an expression in scheme. If
+ * it is detected in a place where an expression is expected, an 'Illegal
+ * empty combination' error is signalled. Note: If you encounter this error
+ * message, it is very likely that you intended to denote the empty list. To
+ * do so, you need to quote the empty list like (quote ()) or '(). */
+static const char s_empty_combination[] = "Illegal empty combination";
+
+/* A body may hold an arbitrary number of internal defines, followed by a
+ * non-empty sequence of expressions. If a body with an empty sequence of
+ * expressions is detected, a 'Missing body expression' error is signalled.
+ */
+static const char s_missing_body_expression[] = "Missing body expression in";
+
+/* A body may hold an arbitrary number of internal defines, followed by a
+ * non-empty sequence of expressions. Each the definitions and the
+ * expressions may be grouped arbitraryly with begin, but it is not allowed to
+ * mix definitions and expressions. If a define form in a body mixes
+ * definitions and expressions, a 'Mixed definitions and expressions' error is
+ * signalled. */
+static const char s_mixed_body_forms[] = "Mixed definitions and expressions in";
+/* Definitions are only allowed on the top level and at the start of a body.
+ * If a definition is detected anywhere else, a 'Bad define placement' error
+ * is signalled. */
+static const char s_bad_define[] = "Bad define placement";
+
/* Case or cond expressions must have at least one clause. If a case or cond
* expression without any clauses is detected, a 'Missing clauses' error is
* signalled. */
* more than once, a 'Duplicate formal' error is signalled. */
static const char s_duplicate_formal[] = "Duplicate formal";
+/* If the evaluation of an unquote-splicing expression gives something else
+ * than a proper list, a 'Non-list result for unquote-splicing' error is
+ * signalled. */
+static const char s_splicing[] = "Non-list result for unquote-splicing";
+
+/* If something else than an exact integer is detected as the argument for
+ * @slot-ref and @slot-set!, a 'Bad slot number' error is signalled. */
+static const char s_bad_slot_number[] = "Bad slot number";
+
/* Signal a syntax error. We distinguish between the form that caused the
* error and the enclosing expression. The error message will print out as
static void
syntax_error (const char* const msg, const SCM form, const SCM expr)
{
- const SCM msg_string = scm_makfrom0str (msg);
+ SCM msg_string = scm_from_locale_string (msg);
SCM filename = SCM_BOOL_F;
SCM linenr = SCM_BOOL_F;
const char *format;
SCM args;
- if (SCM_CONSP (form))
+ if (scm_is_pair (form))
{
filename = scm_source_property (form, scm_sym_filename);
linenr = scm_source_property (form, scm_sym_line);
}
- if (SCM_FALSEP (filename) && SCM_FALSEP (linenr) && SCM_CONSP (expr))
+ if (scm_is_false (filename) && scm_is_false (linenr) && scm_is_pair (expr))
{
filename = scm_source_property (expr, scm_sym_filename);
linenr = scm_source_property (expr, scm_sym_line);
if (!SCM_UNBNDP (expr))
{
- if (!SCM_FALSEP (filename))
+ if (scm_is_true (filename))
{
format = "In file ~S, line ~S: ~A ~S in expression ~S.";
args = scm_list_5 (filename, linenr, msg_string, form, expr);
}
- else if (!SCM_FALSEP (linenr))
+ else if (scm_is_true (linenr))
{
format = "In line ~S: ~A ~S in expression ~S.";
args = scm_list_4 (linenr, msg_string, form, expr);
}
else
{
- if (!SCM_FALSEP (filename))
+ if (scm_is_true (filename))
{
format = "In file ~S, line ~S: ~A ~S.";
args = scm_list_4 (filename, linenr, msg_string, form);
}
- else if (!SCM_FALSEP (linenr))
+ else if (scm_is_true (linenr))
{
format = "In line ~S: ~A ~S.";
args = scm_list_3 (linenr, msg_string, form);
* environment frame, the number of the binding within that frame, and a
* boolean value indicating whether the binding is the last binding in the
* frame.
+ *
+ * Frame numbers have 11 bits, relative offsets have 12 bits.
*/
+
#define SCM_ILOC00 SCM_MAKE_ITAG8(0L, scm_tc8_iloc)
+#define SCM_IFRINC (0x00000100L)
+#define SCM_ICDR (0x00080000L)
#define SCM_IDINC (0x00100000L)
+#define SCM_IFRAME(n) ((long)((SCM_ICDR-SCM_IFRINC)>>8) \
+ & (SCM_UNPACK (n) >> 8))
+#define SCM_IDIST(n) (SCM_UNPACK (n) >> 20)
+#define SCM_ICDRP(n) (SCM_ICDR & SCM_UNPACK (n))
#define SCM_IDSTMSK (-SCM_IDINC)
+#define SCM_IFRAMEMAX ((1<<11)-1)
+#define SCM_IDISTMAX ((1<<12)-1)
#define SCM_MAKE_ILOC(frame_nr, binding_nr, last_p) \
SCM_PACK ( \
((frame_nr) << 8) \
+ ((last_p) ? SCM_ICDR : 0) \
+ scm_tc8_iloc )
+void
+scm_i_print_iloc (SCM iloc, SCM port)
+{
+ scm_puts ("#@", port);
+ scm_intprint ((long) SCM_IFRAME (iloc), 10, port);
+ scm_putc (SCM_ICDRP (iloc) ? '-' : '+', port);
+ scm_intprint ((long) SCM_IDIST (iloc), 10, port);
+}
+
#if (SCM_DEBUG_DEBUGGING_SUPPORT == 1)
SCM scm_dbg_make_iloc (SCM frame, SCM binding, SCM cdrp);
+
SCM_DEFINE (scm_dbg_make_iloc, "dbg-make-iloc", 3, 0, 0,
(SCM frame, SCM binding, SCM cdrp),
"Return a new iloc with frame offset @var{frame}, binding\n"
"offset @var{binding} and the cdr flag @var{cdrp}.")
#define FUNC_NAME s_scm_dbg_make_iloc
{
- SCM_VALIDATE_INUM (1, frame);
- SCM_VALIDATE_INUM (2, binding);
- return SCM_MAKE_ILOC (SCM_INUM (frame),
- SCM_INUM (binding),
- !SCM_FALSEP (cdrp));
+ return SCM_MAKE_ILOC ((scm_t_bits) scm_to_unsigned_integer (frame, 0, SCM_IFRAMEMAX),
+ (scm_t_bits) scm_to_unsigned_integer (binding, 0, SCM_IDISTMAX),
+ scm_is_true (cdrp));
}
#undef FUNC_NAME
SCM scm_dbg_iloc_p (SCM obj);
+
SCM_DEFINE (scm_dbg_iloc_p, "dbg-iloc?", 1, 0, 0,
(SCM obj),
"Return @code{#t} if @var{obj} is an iloc.")
#define FUNC_NAME s_scm_dbg_iloc_p
{
- return SCM_BOOL (SCM_ILOCP (obj));
+ return scm_from_bool (SCM_ILOCP (obj));
}
#undef FUNC_NAME
\f
-#define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \
- do { \
- if (SCM_EQ_P ((x), SCM_EOL)) \
- scm_misc_error (NULL, s_expression, SCM_EOL); \
- } while (0)
-
-\f
-
-/* 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.
- *
- * 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.
- *
- * 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).
+/* {Evaluator byte codes (isyms)}
*/
-#define SCM_CEVAL scm_ceval
-
-#define SCM_EVALIM2(x) \
- ((SCM_EQ_P ((x), SCM_EOL) \
- ? scm_misc_error (NULL, s_expression, SCM_EOL), 0 \
- : 0), \
- (x))
-
-#define SCM_EVALIM(x, env) (SCM_ILOCP (x) \
- ? *scm_ilookup ((x), env) \
- : SCM_EVALIM2(x))
-
-#define SCM_XEVAL(x, env) (SCM_IMP (x) \
- ? SCM_EVALIM2(x) \
- : (*scm_ceval_ptr) ((x), (env)))
-
-#define SCM_XEVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \
- ? SCM_EVALIM (SCM_CAR (x), env) \
- : (SCM_SYMBOLP (SCM_CAR (x)) \
- ? *scm_lookupcar (x, env, 1) \
- : (*scm_ceval_ptr) (SCM_CAR (x), env)))
+#define ISYMNUM(n) (SCM_ITAG8_DATA (n))
-#define EVALCAR(x, env) (SCM_IMP (SCM_CAR (x)) \
- ? SCM_EVALIM (SCM_CAR (x), env) \
- : (SCM_SYMBOLP (SCM_CAR (x)) \
- ? *scm_lookupcar (x, env, 1) \
- : SCM_CEVAL (SCM_CAR (x), env)))
-
-SCM_REC_MUTEX (source_mutex);
-
-
-static const char s_expression[] = "missing or extra expression";
-static const char s_test[] = "bad test";
-static const char s_body[] = "bad body";
-static const char s_bindings[] = "bad bindings";
-static const char s_duplicate_bindings[] = "duplicate bindings";
-static const char s_variable[] = "bad variable";
-static const char s_splicing[] = "bad (non-list) result for unquote-splicing";
-
-
-/* Lookup a given local variable in an environment. The local variable is
- * given as an iloc, that is a triple <frame, binding, last?>, where frame
- * indicates the relative number of the environment frame (counting upwards
- * from the innermost environment frame), binding indicates the number of the
- * binding within the frame, and last? (which is extracted from the iloc using
- * the macro SCM_ICDRP) indicates whether the binding forms the binding at the
- * very end of the improper list of bindings. */
-SCM *
-scm_ilookup (SCM iloc, SCM env)
+/* This table must agree with the list of SCM_IM_ constants in tags.h */
+static const char *const isymnames[] =
{
- unsigned int frame_nr = SCM_IFRAME (iloc);
- unsigned int binding_nr = SCM_IDIST (iloc);
- SCM frames = env;
- SCM bindings;
-
- for (; 0 != frame_nr; --frame_nr)
- frames = SCM_CDR (frames);
-
- bindings = SCM_CAR (frames);
- for (; 0 != binding_nr; --binding_nr)
- bindings = SCM_CDR (bindings);
+ "#@and",
+ "#@begin",
+ "#@case",
+ "#@cond",
+ "#@do",
+ "#@if",
+ "#@lambda",
+ "#@let",
+ "#@let*",
+ "#@letrec",
+ "#@or",
+ "#@quote",
+ "#@set!",
+ "#@define",
+ "#@apply",
+ "#@call-with-current-continuation",
+ "#@dispatch",
+ "#@slot-ref",
+ "#@slot-set!",
+ "#@delay",
+ "#@future",
+ "#@call-with-values",
+ "#@else",
+ "#@arrow",
+ "#@nil-cond",
+ "#@bind"
+};
- if (SCM_ICDRP (iloc))
- return SCM_CDRLOC (bindings);
- return SCM_CARLOC (SCM_CDR (bindings));
+void
+scm_i_print_isym (SCM isym, SCM port)
+{
+ const size_t isymnum = ISYMNUM (isym);
+ if (isymnum < (sizeof isymnames / sizeof (char *)))
+ scm_puts (isymnames[isymnum], port);
+ else
+ scm_ipruk ("isym", isym, port);
}
+\f
-/* 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 variables), 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 the lookup procedure 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 following 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 variable 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 variable containing 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 what 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 receiving 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. */
+/* The function lookup_symbol is used during memoization: Lookup the symbol in
+ * the environment. If there is no binding for the symbol, SCM_UNDEFINED is
+ * returned. If the symbol is a global variable, the variable object to which
+ * the symbol is bound is returned. Finally, if the symbol is a local
+ * variable the corresponding iloc object is returned. */
-SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable");
+/* A helper function for lookup_symbol: Try to find the symbol in the top
+ * level environment frame. The function returns SCM_UNDEFINED if the symbol
+ * is unbound and it returns a variable object if the symbol is a global
+ * variable. */
+static SCM
+lookup_global_symbol (const SCM symbol, const SCM top_level)
+{
+ const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F);
+ if (scm_is_false (variable))
+ return SCM_UNDEFINED;
+ else
+ return variable;
+}
-static SCM *
-scm_lookupcar1 (SCM vloc, SCM genv, int check)
+static SCM
+lookup_symbol (const SCM symbol, const SCM env)
{
- SCM env = genv;
- register SCM *al, fl, var = SCM_CAR (vloc);
- register SCM iloc = SCM_ILOC00;
- for (; SCM_NIMP (env); env = SCM_CDR (env))
+ SCM frame_idx;
+ unsigned int frame_nr;
+
+ for (frame_idx = env, frame_nr = 0;
+ !scm_is_null (frame_idx);
+ frame_idx = SCM_CDR (frame_idx), ++frame_nr)
{
- if (!SCM_CONSP (SCM_CAR (env)))
- break;
- al = SCM_CARLOC (env);
- for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl))
+ const SCM frame = SCM_CAR (frame_idx);
+ if (scm_is_pair (frame))
{
- if (!SCM_CONSP (fl))
- {
- if (SCM_EQ_P (fl, var))
- {
- if (! SCM_EQ_P (SCM_CAR (vloc), var))
- goto race;
- SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR);
- return SCM_CDRLOC (*al);
- }
- else
- break;
- }
- al = SCM_CDRLOC (*al);
- if (SCM_EQ_P (SCM_CAR (fl), var))
+ /* frame holds a local environment frame */
+ SCM symbol_idx;
+ unsigned int symbol_nr;
+
+ for (symbol_idx = SCM_CAR (frame), symbol_nr = 0;
+ scm_is_pair (symbol_idx);
+ symbol_idx = SCM_CDR (symbol_idx), ++symbol_nr)
{
- if (SCM_UNBNDP (SCM_CAR (*al)))
- {
- env = SCM_EOL;
- goto errout;
- }
- if (!SCM_EQ_P (SCM_CAR (vloc), var))
- goto race;
- SCM_SETCAR (vloc, iloc);
- return SCM_CARLOC (*al);
+ if (scm_is_eq (SCM_CAR (symbol_idx), symbol))
+ /* found the symbol, therefore return the iloc */
+ return SCM_MAKE_ILOC (frame_nr, symbol_nr, 0);
}
- iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC);
+ if (scm_is_eq (symbol_idx, symbol))
+ /* found the symbol as the last element of the current frame */
+ return SCM_MAKE_ILOC (frame_nr, symbol_nr, 1);
+ }
+ else
+ {
+ /* no more local environment frames */
+ return lookup_global_symbol (symbol, frame);
}
- iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC));
}
- {
- SCM top_thunk, real_var;
- 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;
- real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F);
- if (SCM_FALSEP (real_var))
- goto errout;
-
- if (!SCM_NULLP (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var)))
- {
- errout:
- if (check)
- {
- if (SCM_NULLP (env))
- scm_error (scm_unbound_variable_key, NULL,
- "Unbound variable: ~S",
- scm_list_1 (var), SCM_BOOL_F);
- else
- scm_misc_error (NULL, "Damaged environment: ~S",
- scm_list_1 (var));
- }
- else
- {
- /* A variable could not be found, but we shall
- not throw an error. */
- static SCM undef_object = SCM_UNDEFINED;
- return &undef_object;
- }
- }
-
- if (!SCM_EQ_P (SCM_CAR (vloc), var))
- {
- /* 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 (SCM_VARIABLEP (var))
- return SCM_VARIABLE_LOC (var);
- if (SCM_ITAG7 (var) == SCM_ITAG7 (SCM_ILOC00))
- return scm_ilookup (var, genv);
- /* We can't cope with anything else than variables 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;
- }
- SCM_SETCAR (vloc, real_var);
- return SCM_VARIABLE_LOC (real_var);
- }
+ return lookup_global_symbol (symbol, SCM_BOOL_F);
}
-SCM *
-scm_lookupcar (SCM vloc, SCM genv, int check)
-{
- SCM *loc = scm_lookupcar1 (vloc, genv, check);
- if (loc == NULL)
- abort ();
- return loc;
-}
/* Return true if the symbol is - from the point of view of a macro
* transformer - a literal in the sense specified in chapter "pattern
static int
literal_p (const SCM symbol, const SCM env)
{
- const SCM x = scm_cons (symbol, SCM_UNDEFINED);
- const SCM value = *scm_lookupcar (x, env, 0);
- if (SCM_UNBNDP (value) || SCM_MACROP (value))
+ const SCM variable = lookup_symbol (symbol, env);
+ if (SCM_UNBNDP (variable))
+ return 1;
+ if (SCM_VARIABLEP (variable) && SCM_MACROP (SCM_VARIABLE_REF (variable)))
return 1;
else
return 0;
}
-#define unmemocar scm_unmemocar
+
+/* Return true if the expression is self-quoting in the memoized code. Thus,
+ * some other objects (like e. g. vectors) are reported as self-quoting, which
+ * according to R5RS would need to be quoted. */
+static int
+is_self_quoting_p (const SCM expr)
+{
+ if (scm_is_pair (expr))
+ return 0;
+ else if (scm_is_symbol (expr))
+ return 0;
+ else if (scm_is_null (expr))
+ return 0;
+ else return 1;
+}
+
SCM_SYMBOL (sym_three_question_marks, "???");
-SCM
-scm_unmemocar (SCM form, SCM env)
+static SCM
+unmemoize_expression (const SCM expr, const SCM env)
{
- if (!SCM_CONSP (form))
- return form;
+ if (SCM_ILOCP (expr))
+ {
+ SCM frame_idx;
+ unsigned long int frame_nr;
+ SCM symbol_idx;
+ unsigned long int symbol_nr;
+
+ for (frame_idx = env, frame_nr = SCM_IFRAME (expr);
+ frame_nr != 0;
+ frame_idx = SCM_CDR (frame_idx), --frame_nr)
+ ;
+ for (symbol_idx = SCM_CAAR (frame_idx), symbol_nr = SCM_IDIST (expr);
+ symbol_nr != 0;
+ symbol_idx = SCM_CDR (symbol_idx), --symbol_nr)
+ ;
+ return SCM_ICDRP (expr) ? symbol_idx : SCM_CAR (symbol_idx);
+ }
+ else if (SCM_VARIABLEP (expr))
+ {
+ const SCM sym = scm_module_reverse_lookup (scm_env_module (env), expr);
+ return scm_is_true (sym) ? sym : sym_three_question_marks;
+ }
+ else if (scm_is_simple_vector (expr))
+ {
+ return scm_list_2 (scm_sym_quote, expr);
+ }
+ else if (!scm_is_pair (expr))
+ {
+ return expr;
+ }
+ else if (SCM_ISYMP (SCM_CAR (expr)))
+ {
+ return unmemoize_builtin_macro (expr, env);
+ }
else
{
- SCM c = SCM_CAR (form);
- if (SCM_VARIABLEP (c))
- {
- SCM sym = scm_module_reverse_lookup (scm_env_module (env), c);
- if (SCM_FALSEP (sym))
- sym = sym_three_question_marks;
- SCM_SETCAR (form, sym);
- }
- else if (SCM_ILOCP (c))
- {
- unsigned long int ir;
-
- for (ir = SCM_IFRAME (c); ir != 0; --ir)
- env = SCM_CDR (env);
- env = SCM_CAAR (env);
- for (ir = SCM_IDIST (c); ir != 0; --ir)
- env = SCM_CDR (env);
- SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env));
- }
- return form;
+ return unmemoize_exprs (expr, env);
}
}
-SCM
-scm_eval_car (SCM pair, SCM env)
+static SCM
+unmemoize_exprs (const SCM exprs, const SCM env)
{
- return SCM_XEVALCAR (pair, env);
+ SCM r_result = SCM_EOL;
+ SCM expr_idx = exprs;
+ SCM um_expr;
+
+ /* Note that due to the current lazy memoizer we may find partially memoized
+ * code during execution. In such code we have to expect improper lists of
+ * expressions: On the one hand, for such code syntax checks have not yet
+ * fully been performed, on the other hand, there may be even legal code
+ * like '(a . b) appear as an improper list of expressions as long as the
+ * quote expression is still in its unmemoized form. For this reason, the
+ * following code handles improper lists of expressions until memoization
+ * and execution have been completely separated. */
+ for (; scm_is_pair (expr_idx); expr_idx = SCM_CDR (expr_idx))
+ {
+ const SCM expr = SCM_CAR (expr_idx);
+
+ /* In partially memoized code, lists of expressions that stem from a
+ * body form may start with an ISYM if the body itself has not yet been
+ * memoized. This isym is just an internal marker to indicate that the
+ * body still needs to be memoized. An isym may occur at the very
+ * beginning of the body or after one or more comment strings. It is
+ * dropped during unmemoization. */
+ if (!SCM_ISYMP (expr))
+ {
+ um_expr = unmemoize_expression (expr, env);
+ r_result = scm_cons (um_expr, r_result);
+ }
+ }
+ um_expr = unmemoize_expression (expr_idx, env);
+ if (!scm_is_null (r_result))
+ {
+ const SCM result = scm_reverse_x (r_result, SCM_UNDEFINED);
+ SCM_SETCDR (r_result, um_expr);
+ return result;
+ }
+ else
+ {
+ return um_expr;
+ }
}
-\f
-/*
- * The following rewrite expressions and
- * some memoized forms have different syntax
- */
-SCM_GLOBAL_SYMBOL (scm_sym_else, "else");
-SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote");
-SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing");
+/* Rewrite the body (which is given as the list of expressions forming the
+ * body) into its internal form. The internal form of a body (<expr> ...) is
+ * just the body itself, but prefixed with an ISYM that denotes to what kind
+ * of outer construct this body belongs: (<ISYM> <expr> ...). A lambda body
+ * starts with SCM_IM_LAMBDA, for example, a body of a let starts with
+ * SCM_IM_LET, etc.
+ *
+ * It is assumed that the calling expression has already made sure that the
+ * body is a proper list. */
+static SCM
+m_body (SCM op, SCM exprs)
+{
+ /* Don't add another ISYM if one is present already. */
+ if (SCM_ISYMP (SCM_CAR (exprs)))
+ return exprs;
+ else
+ return scm_cons (op, exprs);
+}
-SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame");
-SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame");
-SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame");
-SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace");
+/* The function m_expand_body memoizes a proper list of expressions forming a
+ * body. This function takes care of dealing with internal defines and
+ * transforming them into an equivalent letrec expression. The list of
+ * expressions is rewritten in place. */
-/* 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. */
+/* This is a helper function for m_expand_body. If the argument expression is
+ * a symbol that denotes a syntactic keyword, the corresponding macro object
+ * is returned, in all other cases the function returns SCM_UNDEFINED. */
+static SCM
+try_macro_lookup (const SCM expr, const SCM env)
+{
+ if (scm_is_symbol (expr))
+ {
+ const SCM variable = lookup_symbol (expr, env);
+ if (SCM_VARIABLEP (variable))
+ {
+ const SCM value = SCM_VARIABLE_REF (variable);
+ if (SCM_MACROP (value))
+ return value;
+ }
+ }
-/* XXX - Besides controlling the rewriting of internal defines, the
- additional ISYM could be used for improved error messages.
- This is not done yet. */
+ return SCM_UNDEFINED;
+}
+/* This is a helper function for m_expand_body. It expands user macros,
+ * because for the correct translation of a body we need to know whether they
+ * expand to a definition. */
static SCM
-scm_m_body (SCM op, SCM xorig, const char *what)
+expand_user_macros (SCM expr, const SCM env)
{
- SCM_ASSYNT (scm_ilength (xorig) >= 1, s_body, what);
+ while (scm_is_pair (expr))
+ {
+ const SCM car_expr = SCM_CAR (expr);
+ const SCM new_car = expand_user_macros (car_expr, env);
+ const SCM value = try_macro_lookup (new_car, env);
- /* Don't add another ISYM if one is present already. */
- if (SCM_ISYMP (SCM_CAR (xorig)))
- return xorig;
+ if (SCM_MACROP (value) && SCM_MACRO_TYPE (value) == 2)
+ {
+ /* User macros transform code into code. */
+ expr = scm_call_2 (SCM_MACRO_CODE (value), expr, env);
+ /* We need to reiterate on the transformed code. */
+ }
+ else
+ {
+ /* No user macro: return. */
+ SCM_SETCAR (expr, new_car);
+ return expr;
+ }
+ }
+
+ return expr;
+}
+
+/* This is a helper function for m_expand_body. It determines if a given form
+ * represents an application of a given built-in macro. The built-in macro to
+ * check for is identified by its syntactic keyword. The form is an
+ * application of the given macro if looking up the car of the form in the
+ * given environment actually returns the built-in macro. */
+static int
+is_system_macro_p (const SCM syntactic_keyword, const SCM form, const SCM env)
+{
+ if (scm_is_pair (form))
+ {
+ const SCM car_form = SCM_CAR (form);
+ const SCM value = try_macro_lookup (car_form, env);
+ if (SCM_BUILTIN_MACRO_P (value))
+ {
+ const SCM macro_name = scm_macro_name (value);
+ return scm_is_eq (macro_name, syntactic_keyword);
+ }
+ }
+
+ return 0;
+}
- /* Retain possible doc string. */
- if (!SCM_CONSP (SCM_CAR (xorig)))
+static void
+m_expand_body (const SCM forms, const SCM env)
+{
+ /* The first body form can be skipped since it is known to be the ISYM that
+ * was prepended to the body by m_body. */
+ SCM cdr_forms = SCM_CDR (forms);
+ SCM form_idx = cdr_forms;
+ SCM definitions = SCM_EOL;
+ SCM sequence = SCM_EOL;
+
+ /* According to R5RS, the list of body forms consists of two parts: a number
+ * (maybe zero) of definitions, followed by a non-empty sequence of
+ * expressions. Each the definitions and the expressions may be grouped
+ * arbitrarily with begin, but it is not allowed to mix definitions and
+ * expressions. The task of the following loop therefore is to split the
+ * list of body forms into the list of definitions and the sequence of
+ * expressions. */
+ while (!scm_is_null (form_idx))
{
- if (!SCM_NULLP (SCM_CDR (xorig)))
- return scm_cons (SCM_CAR (xorig),
- scm_m_body (op, SCM_CDR (xorig), what));
- return xorig;
+ const SCM form = SCM_CAR (form_idx);
+ const SCM new_form = expand_user_macros (form, env);
+ if (is_system_macro_p (scm_sym_define, new_form, env))
+ {
+ definitions = scm_cons (new_form, definitions);
+ form_idx = SCM_CDR (form_idx);
+ }
+ else if (is_system_macro_p (scm_sym_begin, new_form, env))
+ {
+ /* We have encountered a group of forms. This has to be either a
+ * (possibly empty) group of (possibly further grouped) definitions,
+ * or a non-empty group of (possibly further grouped)
+ * expressions. */
+ const SCM grouped_forms = SCM_CDR (new_form);
+ unsigned int found_definition = 0;
+ unsigned int found_expression = 0;
+ SCM grouped_form_idx = grouped_forms;
+ while (!found_expression && !scm_is_null (grouped_form_idx))
+ {
+ const SCM inner_form = SCM_CAR (grouped_form_idx);
+ const SCM new_inner_form = expand_user_macros (inner_form, env);
+ if (is_system_macro_p (scm_sym_define, new_inner_form, env))
+ {
+ found_definition = 1;
+ definitions = scm_cons (new_inner_form, definitions);
+ grouped_form_idx = SCM_CDR (grouped_form_idx);
+ }
+ else if (is_system_macro_p (scm_sym_begin, new_inner_form, env))
+ {
+ const SCM inner_group = SCM_CDR (new_inner_form);
+ grouped_form_idx
+ = scm_append (scm_list_2 (inner_group,
+ SCM_CDR (grouped_form_idx)));
+ }
+ else
+ {
+ /* The group marks the start of the expressions of the body.
+ * We have to make sure that within the same group we have
+ * not encountered a definition before. */
+ ASSERT_SYNTAX (!found_definition, s_mixed_body_forms, form);
+ found_expression = 1;
+ grouped_form_idx = SCM_EOL;
+ }
+ }
+
+ /* We have finished processing the group. If we have not yet
+ * encountered an expression we continue processing the forms of the
+ * body to collect further definition forms. Otherwise, the group
+ * marks the start of the sequence of expressions of the body. */
+ if (!found_expression)
+ {
+ form_idx = SCM_CDR (form_idx);
+ }
+ else
+ {
+ sequence = form_idx;
+ form_idx = SCM_EOL;
+ }
+ }
+ else
+ {
+ /* We have detected a form which is no definition. This marks the
+ * start of the sequence of expressions of the body. */
+ sequence = form_idx;
+ form_idx = SCM_EOL;
+ }
}
- return scm_cons (op, xorig);
+ /* FIXME: forms does not hold information about the file location. */
+ ASSERT_SYNTAX (scm_is_pair (sequence), s_missing_body_expression, cdr_forms);
+
+ if (!scm_is_null (definitions))
+ {
+ SCM definition_idx;
+ SCM letrec_tail;
+ SCM letrec_expression;
+ SCM new_letrec_expression;
+
+ SCM bindings = SCM_EOL;
+ for (definition_idx = definitions;
+ !scm_is_null (definition_idx);
+ definition_idx = SCM_CDR (definition_idx))
+ {
+ const SCM definition = SCM_CAR (definition_idx);
+ const SCM canonical_definition = canonicalize_define (definition);
+ const SCM binding = SCM_CDR (canonical_definition);
+ bindings = scm_cons (binding, bindings);
+ };
+
+ letrec_tail = scm_cons (bindings, sequence);
+ /* FIXME: forms does not hold information about the file location. */
+ letrec_expression = scm_cons_source (forms, scm_sym_letrec, letrec_tail);
+ new_letrec_expression = scm_m_letrec (letrec_expression, env);
+ SCM_SETCAR (forms, new_letrec_expression);
+ SCM_SETCDR (forms, SCM_EOL);
+ }
+ else
+ {
+ SCM_SETCAR (forms, SCM_CAR (sequence));
+ SCM_SETCDR (forms, SCM_CDR (sequence));
+ }
}
+static SCM
+macroexp (SCM x, SCM env)
+{
+ SCM res, proc, orig_sym;
+
+ /* Don't bother to produce error messages here. We get them when we
+ eventually execute the code for real. */
+
+ macro_tail:
+ orig_sym = SCM_CAR (x);
+ if (!scm_is_symbol (orig_sym))
+ return x;
+
+ {
+ SCM *proc_ptr = scm_lookupcar1 (x, env, 0);
+ if (proc_ptr == NULL)
+ {
+ /* We have lost the race. */
+ goto macro_tail;
+ }
+ proc = *proc_ptr;
+ }
+
+ /* Only handle memoizing macros. `Acros' and `macros' are really
+ special forms and should not be evaluated here. */
+
+ if (!SCM_MACROP (proc)
+ || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc)))
+ return x;
+
+ SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */
+ res = scm_call_2 (SCM_MACRO_CODE (proc), x, env);
+
+ if (scm_ilength (res) <= 0)
+ res = scm_list_2 (SCM_IM_BEGIN, res);
+
+ /* njrev: Several queries here: (1) I don't see how it can be
+ correct that the SCM_SETCAR 2 lines below this comment needs
+ protection, but the SCM_SETCAR 6 lines above does not, so
+ something here is probably wrong. (2) macroexp() is now only
+ used in one place - scm_m_generalized_set_x - whereas all other
+ macro expansion happens through expand_user_macros. Therefore
+ (2.1) perhaps macroexp() could be eliminated completely now?
+ (2.2) Does expand_user_macros need any critical section
+ protection? */
+
+ SCM_CRITICAL_SECTION_START;
+ SCM_SETCAR (x, SCM_CAR (res));
+ SCM_SETCDR (x, SCM_CDR (res));
+ SCM_CRITICAL_SECTION_END;
+
+ goto macro_tail;
+}
/* Start of the memoizers for the standard R5RS builtin macros. */
}
}
+static SCM
+unmemoize_and (const SCM expr, const SCM env)
+{
+ return scm_cons (scm_sym_and, unmemoize_exprs (SCM_CDR (expr), env));
+}
+
SCM_SYNTAX (s_begin, "begin", scm_i_makbimacro, scm_m_begin);
SCM_GLOBAL_SYMBOL (scm_sym_begin, s_begin);
return expr;
}
+static SCM
+unmemoize_begin (const SCM expr, const SCM env)
+{
+ return scm_cons (scm_sym_begin, unmemoize_exprs (SCM_CDR (expr), env));
+}
+
SCM_SYNTAX (s_case, "case", scm_i_makbimacro, scm_m_case);
SCM_GLOBAL_SYMBOL (scm_sym_case, s_case);
+SCM_GLOBAL_SYMBOL (scm_sym_else, "else");
SCM
scm_m_case (SCM expr, SCM env)
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_clauses, expr);
clauses = SCM_CDR (cdr_expr);
- while (!SCM_NULLP (clauses))
+ while (!scm_is_null (clauses))
{
SCM labels;
s_bad_case_clause, clause, expr);
labels = SCM_CAR (clause);
- if (SCM_CONSP (labels))
+ if (scm_is_pair (labels))
{
ASSERT_SYNTAX_2 (scm_ilength (labels) >= 0,
s_bad_case_labels, labels, expr);
- all_labels = scm_append_x (scm_list_2 (labels, all_labels));
+ all_labels = scm_append (scm_list_2 (labels, all_labels));
}
- else if (SCM_NULLP (labels))
+ else if (scm_is_null (labels))
{
/* The list of labels is empty. According to R5RS this is allowed.
* It means that the sequence of expressions will never be executed.
}
else
{
- ASSERT_SYNTAX_2 (SCM_EQ_P (labels, scm_sym_else) && else_literal_p,
+ ASSERT_SYNTAX_2 (scm_is_eq (labels, scm_sym_else) && else_literal_p,
s_bad_case_labels, labels, expr);
- ASSERT_SYNTAX_2 (SCM_NULLP (SCM_CDR (clauses)),
+ ASSERT_SYNTAX_2 (scm_is_null (SCM_CDR (clauses)),
s_misplaced_else_clause, clause, expr);
}
/* build the new clause */
- if (SCM_EQ_P (labels, scm_sym_else))
+ if (scm_is_eq (labels, scm_sym_else))
SCM_SETCAR (clause, SCM_IM_ELSE);
clauses = SCM_CDR (clauses);
}
/* Check whether all case labels are distinct. */
- for (; !SCM_NULLP (all_labels); all_labels = SCM_CDR (all_labels))
+ for (; !scm_is_null (all_labels); all_labels = SCM_CDR (all_labels))
{
const SCM label = SCM_CAR (all_labels);
- ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (label, SCM_CDR (all_labels))),
+ ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (label, SCM_CDR (all_labels))),
s_duplicate_case_label, label, expr);
}
return expr;
}
+static SCM
+unmemoize_case (const SCM expr, const SCM env)
+{
+ const SCM um_key_expr = unmemoize_expression (SCM_CADR (expr), env);
+ SCM um_clauses = SCM_EOL;
+ SCM clause_idx;
+
+ for (clause_idx = SCM_CDDR (expr);
+ !scm_is_null (clause_idx);
+ clause_idx = SCM_CDR (clause_idx))
+ {
+ const SCM clause = SCM_CAR (clause_idx);
+ const SCM labels = SCM_CAR (clause);
+ const SCM exprs = SCM_CDR (clause);
+
+ const SCM um_exprs = unmemoize_exprs (exprs, env);
+ const SCM um_labels = (scm_is_eq (labels, SCM_IM_ELSE))
+ ? scm_sym_else
+ : scm_i_finite_list_copy (labels);
+ const SCM um_clause = scm_cons (um_labels, um_exprs);
+
+ um_clauses = scm_cons (um_clause, um_clauses);
+ }
+ um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED);
+
+ return scm_cons2 (scm_sym_case, um_key_expr, um_clauses);
+}
+
SCM_SYNTAX (s_cond, "cond", scm_i_makbimacro, scm_m_cond);
SCM_GLOBAL_SYMBOL (scm_sym_cond, s_cond);
ASSERT_SYNTAX (scm_ilength (clauses) >= 1, s_missing_clauses, expr);
for (clause_idx = clauses;
- !SCM_NULLP (clause_idx);
+ !scm_is_null (clause_idx);
clause_idx = SCM_CDR (clause_idx))
{
SCM test;
ASSERT_SYNTAX_2 (length >= 1, s_bad_cond_clause, clause, expr);
test = SCM_CAR (clause);
- if (SCM_EQ_P (test, scm_sym_else) && else_literal_p)
+ if (scm_is_eq (test, scm_sym_else) && else_literal_p)
{
- const int last_clause_p = SCM_NULLP (SCM_CDR (clause_idx));
+ const int last_clause_p = scm_is_null (SCM_CDR (clause_idx));
ASSERT_SYNTAX_2 (length >= 2,
s_bad_cond_clause, clause, expr);
ASSERT_SYNTAX_2 (last_clause_p,
SCM_SETCAR (clause, SCM_IM_ELSE);
}
else if (length >= 2
- && SCM_EQ_P (SCM_CADR (clause), scm_sym_arrow)
+ && scm_is_eq (SCM_CADR (clause), scm_sym_arrow)
&& arrow_literal_p)
{
ASSERT_SYNTAX_2 (length > 2, s_missing_recipient, clause, expr);
ASSERT_SYNTAX_2 (length == 3, s_extra_expression, clause, expr);
SCM_SETCAR (SCM_CDR (clause), SCM_IM_ARROW);
}
+ /* SRFI 61 extended cond */
+ else if (length >= 3
+ && scm_is_eq (SCM_CADDR (clause), scm_sym_arrow)
+ && arrow_literal_p)
+ {
+ ASSERT_SYNTAX_2 (length > 3, s_missing_recipient, clause, expr);
+ ASSERT_SYNTAX_2 (length == 4, s_extra_expression, clause, expr);
+ SCM_SETCAR (SCM_CDDR (clause), SCM_IM_ARROW);
+ }
}
SCM_SETCAR (expr, SCM_IM_COND);
return expr;
}
+static SCM
+unmemoize_cond (const SCM expr, const SCM env)
+{
+ SCM um_clauses = SCM_EOL;
+ SCM clause_idx;
+
+ for (clause_idx = SCM_CDR (expr);
+ !scm_is_null (clause_idx);
+ clause_idx = SCM_CDR (clause_idx))
+ {
+ const SCM clause = SCM_CAR (clause_idx);
+ const SCM sequence = SCM_CDR (clause);
+ const SCM test = SCM_CAR (clause);
+ SCM um_test;
+ SCM um_sequence;
+ SCM um_clause;
+
+ if (scm_is_eq (test, SCM_IM_ELSE))
+ um_test = scm_sym_else;
+ else
+ um_test = unmemoize_expression (test, env);
+
+ if (!scm_is_null (sequence) && scm_is_eq (SCM_CAR (sequence),
+ SCM_IM_ARROW))
+ {
+ const SCM target = SCM_CADR (sequence);
+ const SCM um_target = unmemoize_expression (target, env);
+ um_sequence = scm_list_2 (scm_sym_arrow, um_target);
+ }
+ else
+ {
+ um_sequence = unmemoize_exprs (sequence, env);
+ }
+
+ um_clause = scm_cons (um_test, um_sequence);
+ um_clauses = scm_cons (um_clause, um_clauses);
+ }
+ um_clauses = scm_reverse_x (um_clauses, SCM_UNDEFINED);
+
+ return scm_cons (scm_sym_cond, um_clauses);
+}
+
-SCM_SYNTAX(s_define, "define", scm_i_makbimacro, scm_m_define);
-SCM_GLOBAL_SYMBOL(scm_sym_define, s_define);
+SCM_SYNTAX (s_define, "define", scm_i_makbimacro, scm_m_define);
+SCM_GLOBAL_SYMBOL (scm_sym_define, s_define);
/* Guile provides an extension to R5RS' define syntax to represent function
* currying in a compact way. With this extension, it is allowed to write
*/
/* Dirk:FIXME:: We should provide an implementation for 'define' in the R5RS
* module that does not implement this extension. */
-SCM
-scm_m_define (SCM expr, SCM env)
+static SCM
+canonicalize_define (const SCM expr)
{
SCM body;
SCM variable;
body = SCM_CDR (cdr_expr);
variable = SCM_CAR (cdr_expr);
- while (SCM_CONSP (variable))
+ while (scm_is_pair (variable))
{
/* This while loop realizes function currying by variable nesting.
* Variable is known to be a nested-variable. In every iteration of the
body = scm_list_1 (lambda);
variable = SCM_CAR (variable);
}
- ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr);
+ ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr);
ASSERT_SYNTAX (scm_ilength (body) == 1, s_expression, expr);
- if (SCM_TOP_LEVEL (env))
- {
- SCM var;
- const SCM value = scm_eval_car (body, env);
- if (SCM_REC_PROCNAMES_P)
- {
- SCM tmp = value;
- while (SCM_MACROP (tmp))
- tmp = SCM_MACRO_CODE (tmp);
- if (SCM_CLOSUREP (tmp)
- /* Only the first definition determines the name. */
- && SCM_FALSEP (scm_procedure_property (tmp, scm_sym_name)))
- scm_set_procedure_property_x (tmp, scm_sym_name, variable);
- }
- var = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T);
- SCM_VARIABLE_SET (var, value);
- return SCM_UNSPECIFIED;
- }
- else
- {
- SCM_SETCAR (expr, SCM_IM_DEFINE);
- SCM_SETCAR (cdr_expr, variable);
- SCM_SETCDR (cdr_expr, body);
- return expr;
- }
+ SCM_SETCAR (cdr_expr, variable);
+ SCM_SETCDR (cdr_expr, body);
+ return expr;
+}
+
+/* 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. This means, that within the expression we may already assign
+ * values to variable: (define foo (begin (set! foo 1) (+ foo 1))) */
+SCM
+scm_m_define (SCM expr, SCM env)
+{
+ ASSERT_SYNTAX (SCM_TOP_LEVEL (env), s_bad_define, expr);
+
+ {
+ const SCM canonical_definition = canonicalize_define (expr);
+ const SCM cdr_canonical_definition = SCM_CDR (canonical_definition);
+ const SCM variable = SCM_CAR (cdr_canonical_definition);
+ const SCM location
+ = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_T);
+ const SCM value = scm_eval_car (SCM_CDR (cdr_canonical_definition), env);
+
+ if (SCM_REC_PROCNAMES_P)
+ {
+ SCM tmp = value;
+ while (SCM_MACROP (tmp))
+ tmp = SCM_MACRO_CODE (tmp);
+ if (SCM_CLOSUREP (tmp)
+ /* Only the first definition determines the name. */
+ && scm_is_false (scm_procedure_property (tmp, scm_sym_name)))
+ scm_set_procedure_property_x (tmp, scm_sym_name, variable);
+ }
+
+ SCM_VARIABLE_SET (location, value);
+
+ return SCM_UNSPECIFIED;
+ }
}
return new_expr;
}
+static SCM
+unmemoize_delay (const SCM expr, const SCM env)
+{
+ const SCM thunk_expr = SCM_CADDR (expr);
+ return scm_list_2 (scm_sym_delay, unmemoize_expression (thunk_expr, env));
+}
+
SCM_SYNTAX(s_do, "do", scm_i_makbimacro, scm_m_do);
SCM_GLOBAL_SYMBOL(scm_sym_do, s_do);
binding_idx = SCM_CAR (cdr_expr);
ASSERT_SYNTAX_2 (scm_ilength (binding_idx) >= 0,
s_bad_bindings, binding_idx, expr);
- for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx))
+ for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx))
{
const SCM binding = SCM_CAR (binding_idx);
const long length = scm_ilength (binding);
const SCM name = SCM_CAR (binding);
const SCM init = SCM_CADR (binding);
const SCM step = (length == 2) ? name : SCM_CADDR (binding);
- ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr);
- ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, variables)),
+ ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr);
+ ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, variables)),
s_duplicate_binding, name, expr);
variables = scm_cons (name, variables);
return expr;
}
+static SCM
+unmemoize_do (const SCM expr, const SCM env)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ const SCM cddr_expr = SCM_CDR (cdr_expr);
+ const SCM rnames = SCM_CAR (cddr_expr);
+ const SCM extended_env = SCM_EXTEND_ENV (rnames, SCM_EOL, env);
+ const SCM cdddr_expr = SCM_CDR (cddr_expr);
+ const SCM exit_sequence = SCM_CAR (cdddr_expr);
+ const SCM um_exit_sequence = unmemoize_exprs (exit_sequence, extended_env);
+ const SCM cddddr_expr = SCM_CDR (cdddr_expr);
+ const SCM um_body = unmemoize_exprs (SCM_CAR (cddddr_expr), extended_env);
+
+ /* build transformed binding list */
+ SCM um_names = scm_reverse (rnames);
+ SCM um_inits = unmemoize_exprs (SCM_CAR (cdr_expr), env);
+ SCM um_steps = unmemoize_exprs (SCM_CDR (cddddr_expr), extended_env);
+ SCM um_bindings = SCM_EOL;
+ while (!scm_is_null (um_names))
+ {
+ const SCM name = SCM_CAR (um_names);
+ const SCM init = SCM_CAR (um_inits);
+ SCM step = SCM_CAR (um_steps);
+ step = scm_is_eq (step, name) ? SCM_EOL : scm_list_1 (step);
+
+ um_bindings = scm_cons (scm_cons2 (name, init, step), um_bindings);
+
+ um_names = SCM_CDR (um_names);
+ um_inits = SCM_CDR (um_inits);
+ um_steps = SCM_CDR (um_steps);
+ }
+ um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED);
+
+ return scm_cons (scm_sym_do,
+ scm_cons2 (um_bindings, um_exit_sequence, um_body));
+}
+
SCM_SYNTAX (s_if, "if", scm_i_makbimacro, scm_m_if);
SCM_GLOBAL_SYMBOL (scm_sym_if, s_if);
return expr;
}
+static SCM
+unmemoize_if (const SCM expr, const SCM env)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ const SCM um_condition = unmemoize_expression (SCM_CAR (cdr_expr), env);
+ const SCM cddr_expr = SCM_CDR (cdr_expr);
+ const SCM um_then = unmemoize_expression (SCM_CAR (cddr_expr), env);
+ const SCM cdddr_expr = SCM_CDR (cddr_expr);
+
+ if (scm_is_null (cdddr_expr))
+ {
+ return scm_list_3 (scm_sym_if, um_condition, um_then);
+ }
+ else
+ {
+ const SCM um_else = unmemoize_expression (SCM_CAR (cdddr_expr), env);
+ return scm_list_4 (scm_sym_if, um_condition, um_then, um_else);
+ }
+}
+
SCM_SYNTAX (s_lambda, "lambda", scm_i_makbimacro, scm_m_lambda);
SCM_GLOBAL_SYMBOL (scm_sym_lambda, s_lambda);
static int
c_improper_memq (SCM obj, SCM list)
{
- for (; SCM_CONSP (list); list = SCM_CDR (list))
+ for (; scm_is_pair (list); list = SCM_CDR (list))
{
- if (SCM_EQ_P (SCM_CAR (list), obj))
+ if (scm_is_eq (SCM_CAR (list), obj))
return 1;
}
- return SCM_EQ_P (list, obj);
+ return scm_is_eq (list, obj);
}
SCM
{
SCM formals;
SCM formals_idx;
+ SCM cddr_expr;
+ int documentation;
+ SCM body;
+ SCM new_body;
const SCM cdr_expr = SCM_CDR (expr);
const long length = scm_ilength (cdr_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 = SCM_CAR (cdr_expr);
- if (SCM_CONSP (formals))
+ 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_SYMBOLP (formals) || SCM_NULLP (formals),
+ 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_CONSP (formals_idx))
+ while (scm_is_pair (formals_idx))
{
const SCM formal = SCM_CAR (formals_idx);
const SCM next_idx = SCM_CDR (formals_idx);
- ASSERT_SYNTAX_2 (SCM_SYMBOLP (formal), s_bad_formal, formal, expr);
+ 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);
formals_idx = next_idx;
}
- ASSERT_SYNTAX_2 (SCM_NULLP (formals_idx) || SCM_SYMBOLP (formals_idx),
+ ASSERT_SYNTAX_2 (scm_is_null (formals_idx) || scm_is_symbol (formals_idx),
s_bad_formal, formals_idx, expr);
- return scm_cons2 (SCM_IM_LAMBDA, SCM_CAR (cdr_expr),
- scm_m_body (SCM_IM_LAMBDA, SCM_CDR (cdr_expr), s_lambda));
+ /* Memoize the body. Keep a potential documentation string. */
+ /* Dirk:FIXME:: We should probably extract the documentation string to
+ * some external database. Otherwise it will slow down execution, since
+ * the documentation string will have to be skipped with every execution
+ * of the closure. */
+ cddr_expr = SCM_CDR (cdr_expr);
+ documentation = (length >= 3 && scm_is_string (SCM_CAR (cddr_expr)));
+ body = documentation ? SCM_CDR (cddr_expr) : cddr_expr;
+ new_body = m_body (SCM_IM_LAMBDA, body);
+
+ SCM_SETCAR (expr, SCM_IM_LAMBDA);
+ if (documentation)
+ SCM_SETCDR (cddr_expr, new_body);
+ else
+ SCM_SETCDR (cdr_expr, new_body);
+ return expr;
+}
+
+static SCM
+unmemoize_lambda (const SCM expr, const SCM env)
+{
+ const SCM formals = SCM_CADR (expr);
+ const SCM body = SCM_CDDR (expr);
+
+ const SCM new_env = SCM_EXTEND_ENV (formals, SCM_EOL, env);
+ const SCM um_formals = scm_i_finite_list_copy (formals);
+ const SCM um_body = unmemoize_exprs (body, new_env);
+
+ return scm_cons2 (scm_sym_lambda, um_formals, um_body);
}
s_bad_bindings, bindings, expr);
binding_idx = bindings;
- for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx))
+ for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx))
{
SCM name; /* const */
s_bad_binding, binding, expr);
name = SCM_CAR (binding);
- ASSERT_SYNTAX_2 (SCM_SYMBOLP (name), s_bad_variable, name, expr);
+ ASSERT_SYNTAX_2 (scm_is_symbol (name), s_bad_variable, name, expr);
}
}
SCM rvariables = SCM_EOL;
SCM rinits = SCM_EOL;
SCM binding_idx = bindings;
- for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx))
+ for (; !scm_is_null (binding_idx); binding_idx = SCM_CDR (binding_idx))
{
const SCM binding = SCM_CAR (binding_idx);
const SCM cdr_binding = SCM_CDR (binding);
const SCM name = SCM_CAR (binding);
- ASSERT_SYNTAX_2 (SCM_FALSEP (scm_c_memq (name, rvariables)),
+ ASSERT_SYNTAX_2 (scm_is_false (scm_c_memq (name, rvariables)),
s_duplicate_binding, name, expr);
rvariables = scm_cons (name, rvariables);
rinits = scm_cons (SCM_CAR (cdr_binding), rinits);
{
const SCM let_body = SCM_CDR (cddr_expr);
- const SCM lambda_body = scm_m_body (SCM_IM_LET, let_body, "let");
+ const SCM lambda_body = m_body (SCM_IM_LET, let_body);
const SCM lambda_tail = scm_cons (variables, lambda_body);
const SCM lambda_form = scm_cons_source (expr, scm_sym_lambda, lambda_tail);
const SCM rvar = scm_list_1 (name);
const SCM init = scm_list_1 (lambda_form);
- const SCM body = scm_m_body (SCM_IM_LET, scm_list_1 (name), "let");
+ const SCM body = m_body (SCM_IM_LET, scm_list_1 (name));
const SCM letrec_tail = scm_cons (rvar, scm_cons (init, body));
const SCM letrec_form = scm_cons_source (expr, SCM_IM_LETREC, letrec_tail);
return scm_cons_source (expr, letrec_form, inits);
ASSERT_SYNTAX (length >= 2, s_missing_expression, expr);
bindings = SCM_CAR (cdr_expr);
- if (SCM_SYMBOLP (bindings))
+ 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_NULLP (bindings) || SCM_NULLP (SCM_CDR (bindings)))
+ if (scm_is_null (bindings) || scm_is_null (SCM_CDR (bindings)))
{
/* Special case: no bindings or single binding => let* is faster. */
- const SCM body = scm_m_body (SCM_IM_LET, SCM_CDR (cdr_expr), s_let);
+ const SCM body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr));
return scm_m_letstar (scm_cons2 (SCM_CAR (expr), bindings, body), env);
}
else
transform_bindings (bindings, expr, &rvariables, &inits);
{
- const SCM new_body = scm_m_body (SCM_IM_LET, SCM_CDR (cdr_expr), "let");
+ const SCM new_body = m_body (SCM_IM_LET, SCM_CDR (cdr_expr));
const SCM new_tail = scm_cons2 (rvariables, inits, new_body);
SCM_SETCAR (expr, SCM_IM_LET);
SCM_SETCDR (expr, new_tail);
}
}
-
-SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar);
-SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar);
-
-/* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers
- * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */
-SCM
-scm_m_letstar (SCM expr, SCM env SCM_UNUSED)
+static SCM
+build_binding_list (SCM rnames, SCM rinits)
{
- SCM binding_idx;
- SCM new_bindings = SCM_EOL;
- SCM new_body;
-
- const SCM cdr_expr = SCM_CDR (expr);
- ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
- ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
-
- binding_idx = SCM_CAR (cdr_expr);
- check_bindings (binding_idx, expr);
-
- for (; !SCM_NULLP (binding_idx); binding_idx = SCM_CDR (binding_idx))
+ SCM bindings = SCM_EOL;
+ while (!scm_is_null (rnames))
{
- const SCM binding = SCM_CAR (binding_idx);
- const SCM name = SCM_CAR (binding);
- const SCM init = SCM_CADR (binding);
- new_bindings = scm_cons2 (init, name, new_bindings);
+ const SCM binding = scm_list_2 (SCM_CAR (rnames), SCM_CAR (rinits));
+ bindings = scm_cons (binding, bindings);
+ rnames = SCM_CDR (rnames);
+ rinits = SCM_CDR (rinits);
}
- new_bindings = scm_reverse_x (new_bindings, SCM_UNDEFINED);
+ return bindings;
+}
+
+static SCM
+unmemoize_let (const SCM expr, const SCM env)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ const SCM um_rnames = SCM_CAR (cdr_expr);
+ const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env);
+ const SCM cddr_expr = SCM_CDR (cdr_expr);
+ const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), env);
+ const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED);
+ const SCM um_bindings = build_binding_list (um_rnames, um_rinits);
+ const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env);
- new_body = scm_m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr), s_letstar);
- return scm_cons2 (SCM_IM_LETSTAR, new_bindings, new_body);
+ return scm_cons2 (scm_sym_let, um_bindings, um_body);
}
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
bindings = SCM_CAR (cdr_expr);
- if (SCM_NULLP (bindings))
+ if (scm_is_null (bindings))
{
/* no bindings, let* is executed faster */
- SCM body = scm_m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr), s_letrec);
+ SCM body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr));
return scm_m_letstar (scm_cons2 (SCM_CAR (expr), SCM_EOL, body), env);
}
else
check_bindings (bindings, expr);
transform_bindings (bindings, expr, &rvariables, &inits);
- new_body = scm_m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr), "letrec");
+ new_body = m_body (SCM_IM_LETREC, SCM_CDR (cdr_expr));
return scm_cons2 (SCM_IM_LETREC, rvariables, scm_cons (inits, new_body));
}
}
+static SCM
+unmemoize_letrec (const SCM expr, const SCM env)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ const SCM um_rnames = SCM_CAR (cdr_expr);
+ const SCM extended_env = SCM_EXTEND_ENV (um_rnames, SCM_EOL, env);
+ const SCM cddr_expr = SCM_CDR (cdr_expr);
+ const SCM um_inits = unmemoize_exprs (SCM_CAR (cddr_expr), extended_env);
+ const SCM um_rinits = scm_reverse_x (um_inits, SCM_UNDEFINED);
+ const SCM um_bindings = build_binding_list (um_rnames, um_rinits);
+ const SCM um_body = unmemoize_exprs (SCM_CDR (cddr_expr), extended_env);
+
+ return scm_cons2 (scm_sym_letrec, um_bindings, um_body);
+}
+
+
+
+SCM_SYNTAX (s_letstar, "let*", scm_i_makbimacro, scm_m_letstar);
+SCM_GLOBAL_SYMBOL (scm_sym_letstar, s_letstar);
+
+/* (let* ((v1 i1) (v2 i2) ...) body) with variables v1 .. vn and initializers
+ * i1 .. in is transformed into the form (#@let* (v1 i1 v2 i2 ...) body). */
+SCM
+scm_m_letstar (SCM expr, SCM env SCM_UNUSED)
+{
+ SCM binding_idx;
+ SCM new_body;
+
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 2, s_missing_expression, expr);
+
+ binding_idx = SCM_CAR (cdr_expr);
+ check_bindings (binding_idx, expr);
+
+ /* Transform ((v1 i1) (v2 i2) ...) into (v1 i1 v2 i2 ...). The
+ * transformation is done in place. At the beginning of one iteration of
+ * the loop the variable binding_idx holds the form
+ * P1:( (vn . P2:(in . ())) . P3:( (vn+1 in+1) ... ) ),
+ * where P1, P2 and P3 indicate the pairs, that are relevant for the
+ * transformation. P1 and P2 are modified in the loop, P3 remains
+ * untouched. After the execution of the loop, P1 will hold
+ * P1:( vn . P2:(in . P3:( (vn+1 in+1) ... )) )
+ * and binding_idx will hold P3. */
+ while (!scm_is_null (binding_idx))
+ {
+ const SCM cdr_binding_idx = SCM_CDR (binding_idx); /* remember P3 */
+ const SCM binding = SCM_CAR (binding_idx);
+ const SCM name = SCM_CAR (binding);
+ const SCM cdr_binding = SCM_CDR (binding);
+
+ SCM_SETCDR (cdr_binding, cdr_binding_idx); /* update P2 */
+ SCM_SETCAR (binding_idx, name); /* update P1 */
+ SCM_SETCDR (binding_idx, cdr_binding); /* update P1 */
+
+ binding_idx = cdr_binding_idx; /* continue with P3 */
+ }
+
+ new_body = m_body (SCM_IM_LETSTAR, SCM_CDR (cdr_expr));
+ SCM_SETCAR (expr, SCM_IM_LETSTAR);
+ /* the bindings have been changed in place */
+ SCM_SETCDR (cdr_expr, new_body);
+ return expr;
+}
+
+static SCM
+unmemoize_letstar (const SCM expr, const SCM env)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ const SCM body = SCM_CDR (cdr_expr);
+ SCM bindings = SCM_CAR (cdr_expr);
+ SCM um_bindings = SCM_EOL;
+ SCM extended_env = env;
+ SCM um_body;
+
+ while (!scm_is_null (bindings))
+ {
+ const SCM variable = SCM_CAR (bindings);
+ const SCM init = SCM_CADR (bindings);
+ const SCM um_init = unmemoize_expression (init, extended_env);
+ um_bindings = scm_cons (scm_list_2 (variable, um_init), um_bindings);
+ extended_env = SCM_EXTEND_ENV (variable, SCM_BOOL_F, extended_env);
+ bindings = SCM_CDDR (bindings);
+ }
+ um_bindings = scm_reverse_x (um_bindings, SCM_UNDEFINED);
+
+ um_body = unmemoize_exprs (body, extended_env);
+
+ return scm_cons2 (scm_sym_letstar, um_bindings, um_body);
+}
+
SCM_SYNTAX (s_or, "or", scm_i_makbimacro, scm_m_or);
SCM_GLOBAL_SYMBOL (scm_sym_or, s_or);
}
}
+static SCM
+unmemoize_or (const SCM expr, const SCM env)
+{
+ return scm_cons (scm_sym_or, unmemoize_exprs (SCM_CDR (expr), env));
+}
+
SCM_SYNTAX (s_quasiquote, "quasiquote", scm_makacro, scm_m_quasiquote);
SCM_GLOBAL_SYMBOL (scm_sym_quasiquote, s_quasiquote);
+SCM_GLOBAL_SYMBOL (scm_sym_unquote, "unquote");
+SCM_GLOBAL_SYMBOL (scm_sym_uq_splicing, "unquote-splicing");
/* Internal function to handle a quasiquotation: 'form' is the parameter in
* the call (quasiquotation form), 'env' is the environment where unquoted
static SCM
iqq (SCM form, SCM env, unsigned long int depth)
{
- if (SCM_CONSP (form))
+ if (scm_is_pair (form))
{
const SCM tmp = SCM_CAR (form);
- if (SCM_EQ_P (tmp, scm_sym_quasiquote))
+ if (scm_is_eq (tmp, scm_sym_quasiquote))
{
const SCM args = SCM_CDR (form);
ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form);
return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth + 1));
}
- else if (SCM_EQ_P (tmp, scm_sym_unquote))
+ else if (scm_is_eq (tmp, scm_sym_unquote))
{
const SCM args = SCM_CDR (form);
ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form);
else
return scm_list_2 (tmp, iqq (SCM_CAR (args), env, depth - 1));
}
- else if (SCM_CONSP (tmp)
- && SCM_EQ_P (SCM_CAR (tmp), scm_sym_uq_splicing))
+ else if (scm_is_pair (tmp)
+ && scm_is_eq (SCM_CAR (tmp), scm_sym_uq_splicing))
{
const SCM args = SCM_CDR (tmp);
ASSERT_SYNTAX (scm_ilength (args) == 1, s_expression, form);
return scm_cons (iqq (SCM_CAR (form), env, depth),
iqq (SCM_CDR (form), env, depth));
}
- else if (SCM_VECTORP (form))
- {
- size_t i = SCM_VECTOR_LENGTH (form);
- SCM const *const data = SCM_VELTS (form);
- SCM tmp = SCM_EOL;
- while (i != 0)
- tmp = scm_cons (data[--i], tmp);
- scm_remember_upto_here_1 (form);
- return scm_vector (iqq (tmp, env, depth));
- }
+ else if (scm_is_vector (form))
+ return scm_vector (iqq (scm_vector_to_list (form), env, depth));
else
return form;
}
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr);
quotee = SCM_CAR (cdr_expr);
- if (SCM_IMP (quotee) && !SCM_NULLP (quotee))
+ if (is_self_quoting_p (quotee))
return quotee;
- else if (SCM_VECTORP (quotee))
- return quotee;
-#if 0
- /* The following optimization would be possible if all variable references
- * were resolved during memoization: */
- else if (SCM_SYMBOLP (quotee))
- return quotee;
-#endif
+
SCM_SETCAR (expr, SCM_IM_QUOTE);
+ SCM_SETCDR (expr, quotee);
return expr;
}
+static SCM
+unmemoize_quote (const SCM expr, const SCM env SCM_UNUSED)
+{
+ return scm_list_2 (scm_sym_quote, SCM_CDR (expr));
+}
+
/* Will go into the RnRS module when Guile is factorized.
SCM_SYNTAX (s_set_x, "set!", scm_i_makbimacro, scm_m_set_x); */
scm_m_set_x (SCM expr, SCM env SCM_UNUSED)
{
SCM variable;
+ SCM new_variable;
const SCM cdr_expr = SCM_CDR (expr);
ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr);
variable = SCM_CAR (cdr_expr);
- ASSERT_SYNTAX_2 (SCM_SYMBOLP (variable), s_bad_variable, variable, expr);
+
+ /* Memoize the variable form. */
+ ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr);
+ new_variable = lookup_symbol (variable, env);
+ /* Leave the memoization of unbound symbols to lazy memoization: */
+ if (SCM_UNBNDP (new_variable))
+ new_variable = variable;
SCM_SETCAR (expr, SCM_IM_SET_X);
+ SCM_SETCAR (cdr_expr, new_variable);
return expr;
}
+static SCM
+unmemoize_set_x (const SCM expr, const SCM env)
+{
+ return scm_cons (scm_sym_set_x, unmemoize_exprs (SCM_CDR (expr), env));
+}
+
/* Start of the memoizers for non-R5RS builtin macros. */
return expr;
}
+static SCM
+unmemoize_apply (const SCM expr, const SCM env)
+{
+ return scm_list_2 (scm_sym_atapply, unmemoize_exprs (SCM_CDR (expr), env));
+}
+
SCM_SYNTAX (s_atbind, "@bind", scm_i_makbimacro, scm_m_atbind);
transform_bindings (bindings, expr, &rvariables, &inits);
for (variable_idx = rvariables;
- !SCM_NULLP (variable_idx);
+ !scm_is_null (variable_idx);
variable_idx = SCM_CDR (variable_idx))
{
/* The first call to scm_sym2var will look beyond the current module,
* while the second call wont. */
const SCM variable = SCM_CAR (variable_idx);
SCM new_variable = scm_sym2var (variable, top_level, SCM_BOOL_F);
- if (SCM_FALSEP (new_variable))
+ if (scm_is_false (new_variable))
new_variable = scm_sym2var (variable, top_level, SCM_BOOL_T);
SCM_SETCAR (variable_idx, new_variable);
}
SCM_SYNTAX(s_atcall_cc, "@call-with-current-continuation", scm_i_makbimacro, scm_m_cont);
SCM_GLOBAL_SYMBOL(scm_sym_atcall_cc, s_atcall_cc);
-
SCM
-scm_m_cont (SCM xorig, SCM env SCM_UNUSED)
+scm_m_cont (SCM expr, SCM env SCM_UNUSED)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr);
+
+ SCM_SETCAR (expr, SCM_IM_CONT);
+ return expr;
+}
+
+static SCM
+unmemoize_atcall_cc (const SCM expr, const SCM env)
{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 1,
- s_expression, s_atcall_cc);
- return scm_cons (SCM_IM_CONT, SCM_CDR (xorig));
+ return scm_list_2 (scm_sym_atcall_cc, unmemoize_exprs (SCM_CDR (expr), env));
}
SCM_GLOBAL_SYMBOL(scm_sym_at_call_with_values, s_at_call_with_values);
SCM
-scm_m_at_call_with_values (SCM xorig, SCM env SCM_UNUSED)
+scm_m_at_call_with_values (SCM expr, SCM env SCM_UNUSED)
+{
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr);
+
+ SCM_SETCAR (expr, SCM_IM_CALL_WITH_VALUES);
+ return expr;
+}
+
+static SCM
+unmemoize_at_call_with_values (const SCM expr, const SCM env)
{
- SCM_ASSYNT (scm_ilength (SCM_CDR (xorig)) == 2,
- s_expression, s_at_call_with_values);
- return scm_cons (SCM_IM_CALL_WITH_VALUES, SCM_CDR (xorig));
+ return scm_list_2 (scm_sym_at_call_with_values,
+ unmemoize_exprs (SCM_CDR (expr), env));
}
+#if 0
+
+/* See futures.h for a comment why futures are not enabled.
+ */
SCM_SYNTAX (s_future, "future", scm_i_makbimacro, scm_m_future);
SCM_GLOBAL_SYMBOL (scm_sym_future, s_future);
return new_expr;
}
+static SCM
+unmemoize_future (const SCM expr, const SCM env)
+{
+ const SCM thunk_expr = SCM_CADDR (expr);
+ return scm_list_2 (scm_sym_future, unmemoize_expression (thunk_expr, env));
+}
+
+#endif
SCM_SYNTAX (s_gset_x, "set!", scm_i_makbimacro, scm_m_generalized_set_x);
SCM_SYMBOL (scm_sym_setter, "setter");
SCM
-scm_m_generalized_set_x (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (2 == scm_ilength (x), s_expression, s_set_x);
- if (SCM_SYMBOLP (SCM_CAR (x)))
- return scm_cons (SCM_IM_SET_X, x);
- else if (SCM_CONSP (SCM_CAR (x)))
- return scm_cons (scm_list_2 (scm_sym_setter, SCM_CAAR (x)),
- scm_append (scm_list_2 (SCM_CDAR (x), SCM_CDR (x))));
+scm_m_generalized_set_x (SCM expr, SCM env)
+{
+ SCM target, exp_target;
+
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr);
+
+ target = SCM_CAR (cdr_expr);
+ if (!scm_is_pair (target))
+ {
+ /* R5RS usage */
+ return scm_m_set_x (expr, env);
+ }
else
- scm_misc_error (s_set_x, s_variable, SCM_EOL);
-}
+ {
+ /* (set! (foo bar ...) baz) becomes ((setter foo) bar ... baz) */
+ /* Macroexpanding the target might return things of the form
+ (begin <atom>). In that case, <atom> must be a symbol or a
+ variable and we memoize to (set! <atom> ...).
+ */
+ exp_target = macroexp (target, env);
+ if (scm_is_eq (SCM_CAR (exp_target), SCM_IM_BEGIN)
+ && !scm_is_null (SCM_CDR (exp_target))
+ && scm_is_null (SCM_CDDR (exp_target)))
+ {
+ exp_target= SCM_CADR (exp_target);
+ ASSERT_SYNTAX_2 (scm_is_symbol (exp_target)
+ || SCM_VARIABLEP (exp_target),
+ s_bad_variable, exp_target, expr);
+ return scm_cons (SCM_IM_SET_X, scm_cons (exp_target,
+ SCM_CDR (cdr_expr)));
+ }
+ else
+ {
+ const SCM setter_proc_tail = scm_list_1 (SCM_CAR (target));
+ const SCM setter_proc = scm_cons_source (expr, scm_sym_setter,
+ setter_proc_tail);
+
+ const SCM cddr_expr = SCM_CDR (cdr_expr);
+ const SCM setter_args = scm_append_x (scm_list_2 (SCM_CDR (target),
+ cddr_expr));
+ SCM_SETCAR (expr, setter_proc);
+ SCM_SETCDR (expr, setter_args);
+ return expr;
+ }
+ }
+}
-static const char* s_atslot_ref = "@slot-ref";
/* @slot-ref is bound privately in the (oop goops) module from goops.c. As
* soon as the module system allows us to more freely create bindings in
* arbitrary modules during the startup phase, the code from goops.c should be
* moved here. */
+
+SCM_SYMBOL (sym_atslot_ref, "@slot-ref");
+
SCM
-scm_m_atslot_ref (SCM xorig, SCM env SCM_UNUSED)
-#define FUNC_NAME s_atslot_ref
+scm_m_atslot_ref (SCM expr, SCM env SCM_UNUSED)
{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (scm_ilength (x) == 2, s_expression, FUNC_NAME);
- SCM_VALIDATE_INUM (SCM_ARG2, SCM_CADR (x));
- return scm_cons (SCM_IM_SLOT_REF, x);
+ SCM slot_nr;
+
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) == 2, s_expression, expr);
+ slot_nr = SCM_CADR (cdr_expr);
+ ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr);
+
+ SCM_SETCAR (expr, SCM_IM_SLOT_REF);
+ SCM_SETCDR (cdr_expr, slot_nr);
+ return expr;
}
-#undef FUNC_NAME
+static SCM
+unmemoize_atslot_ref (const SCM expr, const SCM env)
+{
+ const SCM instance = SCM_CADR (expr);
+ const SCM um_instance = unmemoize_expression (instance, env);
+ const SCM slot_nr = SCM_CDDR (expr);
+ return scm_list_3 (sym_atslot_ref, um_instance, slot_nr);
+}
-static const char* s_atslot_set_x = "@slot-set!";
/* @slot-set! is bound privately in the (oop goops) module from goops.c. As
* soon as the module system allows us to more freely create bindings in
* arbitrary modules during the startup phase, the code from goops.c should be
* moved here. */
+
+SCM_SYMBOL (sym_atslot_set_x, "@slot-set!");
+
SCM
-scm_m_atslot_set_x (SCM xorig, SCM env SCM_UNUSED)
-#define FUNC_NAME s_atslot_set_x
+scm_m_atslot_set_x (SCM expr, SCM env SCM_UNUSED)
+{
+ SCM slot_nr;
+
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) == 3, s_expression, expr);
+ slot_nr = SCM_CADR (cdr_expr);
+ ASSERT_SYNTAX_2 (SCM_I_INUMP (slot_nr), s_bad_slot_number, slot_nr, expr);
+
+ SCM_SETCAR (expr, SCM_IM_SLOT_SET_X);
+ return expr;
+}
+
+static SCM
+unmemoize_atslot_set_x (const SCM expr, const SCM env)
{
- SCM x = SCM_CDR (xorig);
- SCM_ASSYNT (scm_ilength (x) == 3, s_expression, FUNC_NAME);
- SCM_VALIDATE_INUM (SCM_ARG2, SCM_CADR (x));
- return scm_cons (SCM_IM_SLOT_SET_X, x);
+ const SCM cdr_expr = SCM_CDR (expr);
+ const SCM instance = SCM_CAR (cdr_expr);
+ const SCM um_instance = unmemoize_expression (instance, env);
+ const SCM cddr_expr = SCM_CDR (cdr_expr);
+ const SCM slot_nr = SCM_CAR (cddr_expr);
+ const SCM cdddr_expr = SCM_CDR (cddr_expr);
+ const SCM value = SCM_CAR (cdddr_expr);
+ const SCM um_value = unmemoize_expression (value, env);
+ return scm_list_4 (sym_atslot_set_x, um_instance, slot_nr, um_value);
}
-#undef FUNC_NAME
#if SCM_ENABLE_ELISP
+static const char s_defun[] = "Symbol's function definition is void";
+
SCM_SYNTAX (s_nil_cond, "nil-cond", scm_i_makbimacro, scm_m_nil_cond);
+/* nil-cond expressions have the form
+ * (nil-cond COND VAL COND VAL ... ELSEVAL) */
SCM
-scm_m_nil_cond (SCM xorig, SCM env SCM_UNUSED)
+scm_m_nil_cond (SCM expr, SCM env SCM_UNUSED)
{
- long len = scm_ilength (SCM_CDR (xorig));
- SCM_ASSYNT (len >= 1 && (len & 1) == 1, s_expression, "nil-cond");
- return scm_cons (SCM_IM_NIL_COND, SCM_CDR (xorig));
+ const long length = scm_ilength (SCM_CDR (expr));
+ ASSERT_SYNTAX (length >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (length >= 1 && (length % 2) == 1, s_expression, expr);
+
+ SCM_SETCAR (expr, SCM_IM_NIL_COND);
+ return expr;
}
SCM_SYNTAX (s_atfop, "@fop", scm_i_makbimacro, scm_m_atfop);
+/* The @fop-macro handles procedure and macro applications for elisp. The
+ * input expression must have the form
+ * (@fop <var> (transformer-macro <expr> ...))
+ * where <var> must be a symbol. The expression is transformed into the
+ * memoized form of either
+ * (apply <un-aliased var> (transformer-macro <expr> ...))
+ * if the value of var (across all aliasing) is not a macro, or
+ * (<un-aliased var> <expr> ...)
+ * if var is a macro. */
SCM
-scm_m_atfop (SCM xorig, SCM env SCM_UNUSED)
-{
- SCM x = SCM_CDR (xorig), var;
- SCM_ASSYNT (scm_ilength (x) >= 1, s_expression, "@fop");
- var = scm_symbol_fref (SCM_CAR (x));
- /* Passing the symbol name as the `subr' arg here isn't really
- right, but without it it can be very difficult to work out from
- the error message which function definition was missing. In any
- case, we shouldn't really use SCM_ASSYNT here at all, but instead
- something equivalent to (signal void-function (list SYM)) in
- Elisp. */
- SCM_ASSYNT (SCM_VARIABLEP (var),
- "Symbol's function definition is void",
- SCM_SYMBOL_CHARS (SCM_CAR (x)));
- /* Support `defalias'. */
- while (SCM_SYMBOLP (SCM_VARIABLE_REF (var)))
+scm_m_atfop (SCM expr, SCM env SCM_UNUSED)
+{
+ SCM location;
+ SCM symbol;
+
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 1, s_missing_expression, expr);
+
+ symbol = SCM_CAR (cdr_expr);
+ ASSERT_SYNTAX_2 (scm_is_symbol (symbol), s_bad_variable, symbol, expr);
+
+ location = scm_symbol_fref (symbol);
+ ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr);
+
+ /* The elisp function `defalias' allows to define aliases for symbols. To
+ * look up such definitions, the chain of symbol definitions has to be
+ * followed up to the terminal symbol. */
+ while (scm_is_symbol (SCM_VARIABLE_REF (location)))
+ {
+ const SCM alias = SCM_VARIABLE_REF (location);
+ location = scm_symbol_fref (alias);
+ ASSERT_SYNTAX_2 (SCM_VARIABLEP (location), s_defun, symbol, expr);
+ }
+
+ /* Memoize the value location belonging to the terminal symbol. */
+ SCM_SETCAR (cdr_expr, location);
+
+ if (!SCM_MACROP (SCM_VARIABLE_REF (location)))
{
- var = scm_symbol_fref (SCM_VARIABLE_REF (var));
- SCM_ASSYNT (SCM_VARIABLEP (var),
- "Symbol's function definition is void",
- SCM_SYMBOL_CHARS (SCM_CAR (x)));
+ /* Since the location does not contain a macro, the form is a procedure
+ * application. Replace `@fop' by `@apply' and transform the expression
+ * including the `transformer-macro'. */
+ SCM_SETCAR (expr, SCM_IM_APPLY);
+ return expr;
}
- /* Use `var' here rather than `SCM_VARIABLE_REF (var)' because the
- former allows for automatically picking up redefinitions of the
- corresponding symbol. */
- SCM_SETCAR (x, var);
- /* If the variable contains a procedure, leave the
- `transformer-macro' in place so that the procedure's arguments
- get properly transformed, and change the initial @fop to
- SCM_IM_APPLY. */
- if (!SCM_MACROP (SCM_VARIABLE_REF (var)))
+ else
{
- SCM_SETCAR (xorig, SCM_IM_APPLY);
- return xorig;
+ /* Since the location contains a macro, the arguments should not be
+ * transformed, so the `transformer-macro' is cut out. The resulting
+ * expression starts with the memoized variable, that is at the cdr of
+ * the input expression. */
+ SCM_SETCDR (cdr_expr, SCM_CDADR (cdr_expr));
+ return cdr_expr;
}
- /* Otherwise (the variable contains a macro), the arguments should
- not be transformed, so cut the `transformer-macro' out and return
- the resulting expression starting with the variable. */
- SCM_SETCDR (x, SCM_CDADR (x));
- return x;
}
#endif /* SCM_ENABLE_ELISP */
-/* Start of the memoizers for deprecated macros. */
+static SCM
+unmemoize_builtin_macro (const SCM expr, const SCM env)
+{
+ switch (ISYMNUM (SCM_CAR (expr)))
+ {
+ case (ISYMNUM (SCM_IM_AND)):
+ return unmemoize_and (expr, env);
+ case (ISYMNUM (SCM_IM_BEGIN)):
+ return unmemoize_begin (expr, env);
-#if (SCM_ENABLE_DEPRECATED == 1)
+ case (ISYMNUM (SCM_IM_CASE)):
+ return unmemoize_case (expr, env);
-SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine);
+ case (ISYMNUM (SCM_IM_COND)):
+ return unmemoize_cond (expr, env);
-SCM
-scm_m_undefine (SCM x, SCM env)
-{
- SCM arg1 = x;
- x = SCM_CDR (x);
- SCM_ASSYNT (SCM_TOP_LEVEL (env), "bad placement ", s_undefine);
- SCM_ASSYNT (SCM_CONSP (x) && SCM_NULLP (SCM_CDR (x)),
- s_expression, s_undefine);
- x = SCM_CAR (x);
- SCM_ASSYNT (SCM_SYMBOLP (x), s_variable, s_undefine);
- arg1 = scm_sym2var (x, scm_env_top_level (env), SCM_BOOL_F);
- SCM_ASSYNT (!SCM_FALSEP (arg1) && !SCM_UNBNDP (SCM_VARIABLE_REF (arg1)),
- "variable already unbound ", s_undefine);
- SCM_VARIABLE_SET (arg1, SCM_UNDEFINED);
-#ifdef SICP
- return x;
-#else
- return SCM_UNSPECIFIED;
-#endif
-}
+ case (ISYMNUM (SCM_IM_DELAY)):
+ return unmemoize_delay (expr, env);
-#endif
+ case (ISYMNUM (SCM_IM_DO)):
+ return unmemoize_do (expr, env);
+ case (ISYMNUM (SCM_IM_IF)):
+ return unmemoize_if (expr, env);
-SCM
-scm_m_expand_body (SCM xorig, SCM env)
-{
- SCM x = SCM_CDR (xorig), defs = SCM_EOL;
- char *what = SCM_ISYMCHARS (SCM_CAR (xorig)) + 2;
+ case (ISYMNUM (SCM_IM_LAMBDA)):
+ return unmemoize_lambda (expr, env);
- while (SCM_NIMP (x))
- {
- SCM form = SCM_CAR (x);
- if (!SCM_CONSP (form))
- break;
- if (!SCM_SYMBOLP (SCM_CAR (form)))
- break;
+ case (ISYMNUM (SCM_IM_LET)):
+ return unmemoize_let (expr, env);
- form = scm_macroexp (scm_cons_source (form,
- SCM_CAR (form),
- SCM_CDR (form)),
- env);
+ case (ISYMNUM (SCM_IM_LETREC)):
+ return unmemoize_letrec (expr, env);
- if (SCM_EQ_P (SCM_IM_DEFINE, SCM_CAR (form)))
- {
- defs = scm_cons (SCM_CDR (form), defs);
- x = SCM_CDR (x);
- }
- else if (!SCM_IMP (defs))
- {
- break;
- }
- else if (SCM_EQ_P (SCM_IM_BEGIN, SCM_CAR (form)))
- {
- x = scm_append (scm_list_2 (SCM_CDR (form), SCM_CDR (x)));
- }
- else
- {
- x = scm_cons (form, SCM_CDR (x));
- break;
- }
- }
+ case (ISYMNUM (SCM_IM_LETSTAR)):
+ return unmemoize_letstar (expr, env);
- if (!SCM_NULLP (defs))
- {
- SCM rvars, inits, body, letrec;
- check_bindings (defs, xorig);
- transform_bindings (defs, xorig, &rvars, &inits);
- body = scm_m_body (SCM_IM_DEFINE, x, what);
- letrec = scm_cons2 (SCM_IM_LETREC, rvars, scm_cons (inits, body));
- SCM_SETCAR (xorig, letrec);
- SCM_SETCDR (xorig, SCM_EOL);
- }
- else
- {
- SCM_ASSYNT (SCM_CONSP (x), s_body, what);
- SCM_SETCAR (xorig, SCM_CAR (x));
- SCM_SETCDR (xorig, SCM_CDR (x));
- }
+ case (ISYMNUM (SCM_IM_OR)):
+ return unmemoize_or (expr, env);
- return xorig;
-}
+ case (ISYMNUM (SCM_IM_QUOTE)):
+ return unmemoize_quote (expr, env);
-SCM
-scm_macroexp (SCM x, SCM env)
-{
- SCM res, proc, orig_sym;
+ case (ISYMNUM (SCM_IM_SET_X)):
+ return unmemoize_set_x (expr, env);
- /* Don't bother to produce error messages here. We get them when we
- eventually execute the code for real. */
+ case (ISYMNUM (SCM_IM_APPLY)):
+ return unmemoize_apply (expr, env);
- macro_tail:
- orig_sym = SCM_CAR (x);
- if (!SCM_SYMBOLP (orig_sym))
- return x;
+ case (ISYMNUM (SCM_IM_BIND)):
+ return unmemoize_exprs (expr, env); /* FIXME */
- {
- SCM *proc_ptr = scm_lookupcar1 (x, env, 0);
- if (proc_ptr == NULL)
- {
- /* We have lost the race. */
- goto macro_tail;
- }
- proc = *proc_ptr;
- }
-
- /* Only handle memoizing macros. `Acros' and `macros' are really
- special forms and should not be evaluated here. */
+ case (ISYMNUM (SCM_IM_CONT)):
+ return unmemoize_atcall_cc (expr, env);
- if (!SCM_MACROP (proc)
- || (SCM_MACRO_TYPE (proc) != 2 && !SCM_BUILTIN_MACRO_P (proc)))
- return x;
+ case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)):
+ return unmemoize_at_call_with_values (expr, env);
- SCM_SETCAR (x, orig_sym); /* Undo memoizing effect of lookupcar */
- res = scm_call_2 (SCM_MACRO_CODE (proc), x, env);
-
- if (scm_ilength (res) <= 0)
- res = scm_list_2 (SCM_IM_BEGIN, res);
-
- SCM_DEFER_INTS;
- SCM_SETCAR (x, SCM_CAR (res));
- SCM_SETCDR (x, SCM_CDR (res));
- SCM_ALLOW_INTS;
+#if 0
+ /* See futures.h for a comment why futures are not enabled.
+ */
+ case (ISYMNUM (SCM_IM_FUTURE)):
+ return unmemoize_future (expr, env);
+#endif
- goto macro_tail;
+ case (ISYMNUM (SCM_IM_SLOT_REF)):
+ return unmemoize_atslot_ref (expr, env);
+
+ case (ISYMNUM (SCM_IM_SLOT_SET_X)):
+ return unmemoize_atslot_set_x (expr, env);
+
+ case (ISYMNUM (SCM_IM_NIL_COND)):
+ return unmemoize_exprs (expr, env); /* FIXME */
+
+ default:
+ return unmemoize_exprs (expr, env); /* FIXME */
+ }
+}
+
+
+/* scm_i_unmemocopy_expr and scm_i_unmemocopy_body take a memoized expression
+ * respectively a memoized body together with its environment and rewrite it
+ * to its original form. Thus, these functions are the inversion of the
+ * rewrite rules above. The procedure is not optimized for speed. It's used
+ * in scm_i_unmemoize_expr, scm_procedure_source, macro_print and scm_iprin1.
+ *
+ * Unmemoizing is not a reliable process. You cannot in general expect to get
+ * the original source back.
+ *
+ * However, GOOPS currently relies on this for method compilation. This ought
+ * to change. */
+
+SCM
+scm_i_unmemocopy_expr (SCM expr, SCM env)
+{
+ const SCM source_properties = scm_whash_lookup (scm_source_whash, expr);
+ const SCM um_expr = unmemoize_expression (expr, env);
+
+ if (scm_is_true (source_properties))
+ scm_whash_insert (scm_source_whash, um_expr, source_properties);
+
+ return um_expr;
+}
+
+SCM
+scm_i_unmemocopy_body (SCM forms, SCM env)
+{
+ const SCM source_properties = scm_whash_lookup (scm_source_whash, forms);
+ const SCM um_forms = unmemoize_exprs (forms, env);
+
+ if (scm_is_true (source_properties))
+ scm_whash_insert (scm_source_whash, um_forms, source_properties);
+
+ return um_forms;
+}
+
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+
+/* Deprecated in guile 1.7.0 on 2003-11-09. */
+SCM
+scm_m_expand_body (SCM exprs, SCM env)
+{
+ scm_c_issue_deprecation_warning
+ ("`scm_m_expand_body' is deprecated.");
+ m_expand_body (exprs, env);
+ return exprs;
+}
+
+
+SCM_SYNTAX (s_undefine, "undefine", scm_makacro, scm_m_undefine);
+
+SCM
+scm_m_undefine (SCM expr, SCM env)
+{
+ SCM variable;
+ SCM location;
+
+ const SCM cdr_expr = SCM_CDR (expr);
+ ASSERT_SYNTAX (SCM_TOP_LEVEL (env), "Bad undefine placement in", expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) >= 0, s_bad_expression, expr);
+ ASSERT_SYNTAX (scm_ilength (cdr_expr) == 1, s_expression, expr);
+
+ scm_c_issue_deprecation_warning
+ ("`undefine' is deprecated.\n");
+
+ variable = SCM_CAR (cdr_expr);
+ ASSERT_SYNTAX_2 (scm_is_symbol (variable), s_bad_variable, variable, expr);
+ location = scm_sym2var (variable, scm_env_top_level (env), SCM_BOOL_F);
+ ASSERT_SYNTAX_2 (scm_is_true (location)
+ && !SCM_UNBNDP (SCM_VARIABLE_REF (location)),
+ "variable already unbound ", variable, expr);
+ SCM_VARIABLE_SET (location, SCM_UNDEFINED);
+ return SCM_UNSPECIFIED;
+}
+
+SCM
+scm_macroexp (SCM x, SCM env)
+{
+ scm_c_issue_deprecation_warning
+ ("`scm_macroexp' is deprecated.");
+ return macroexp (x, env);
+}
+
+#endif
+
+
+#if (SCM_ENABLE_DEPRECATED == 1)
+
+SCM
+scm_unmemocar (SCM form, SCM env)
+{
+ scm_c_issue_deprecation_warning
+ ("`scm_unmemocar' is deprecated.");
+
+ if (!scm_is_pair (form))
+ return form;
+ else
+ {
+ SCM c = SCM_CAR (form);
+ if (SCM_VARIABLEP (c))
+ {
+ SCM sym = scm_module_reverse_lookup (scm_env_module (env), c);
+ if (scm_is_false (sym))
+ sym = sym_three_question_marks;
+ SCM_SETCAR (form, sym);
+ }
+ else if (SCM_ILOCP (c))
+ {
+ unsigned long int ir;
+
+ for (ir = SCM_IFRAME (c); ir != 0; --ir)
+ env = SCM_CDR (env);
+ env = SCM_CAAR (env);
+ for (ir = SCM_IDIST (c); ir != 0; --ir)
+ env = SCM_CDR (env);
+
+ SCM_SETCAR (form, SCM_ICDRP (c) ? env : SCM_CAR (env));
+ }
+ return form;
+ }
}
-#define SCM_BIT7(x) (127 & SCM_UNPACK (x))
+#endif
+
+/*****************************************************************************/
+/*****************************************************************************/
+/* The definitions for execution start here. */
+/*****************************************************************************/
+/*****************************************************************************/
+
+SCM_GLOBAL_SYMBOL (scm_sym_enter_frame, "enter-frame");
+SCM_GLOBAL_SYMBOL (scm_sym_apply_frame, "apply-frame");
+SCM_GLOBAL_SYMBOL (scm_sym_exit_frame, "exit-frame");
+SCM_GLOBAL_SYMBOL (scm_sym_trace, "trace");
+SCM_SYMBOL (sym_instead, "instead");
/* A function object to implement "apply" for non-closure functions. */
static SCM f_apply;
/* An endless list consisting of #<undefined> objects: */
static SCM undefineds;
-/* 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.
+
+int
+scm_badargsp (SCM formals, SCM args)
+{
+ while (!scm_is_null (formals))
+ {
+ if (!scm_is_pair (formals))
+ return 0;
+ if (scm_is_null (args))
+ return 1;
+ formals = SCM_CDR (formals);
+ args = SCM_CDR (args);
+ }
+ return !scm_is_null (args) ? 1 : 0;
+}
+
+\f
+
+/* 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):
+ *
+ * CEVAL is the symbol used within one evaluator to call itself.
+ * Originally, it is defined to ceval, but is redefined to deval during the
+ * second pass.
+ *
+ * SCM_I_EVALIM is used when it is known that the expression is an
+ * immediate. (This macro never calls an evaluator.)
*
- * Unmemoizing is not a reliable process. You cannot in general
- * expect to get the original source back.
+ * EVAL evaluates an expression that is expected to have its symbols already
+ * memoized. Expressions that are not of the form '(<form> <form> ...)' are
+ * evaluated inline without calling an evaluator.
*
- * However, GOOPS currently relies on this for method compilation.
- * This ought to change.
+ * EVALCAR evaluates the car of an expression 'X:(Y:<form> <form> ...)',
+ * potentially replacing a symbol at the position Y:<form> by its memoized
+ * variable. If Y:<form> is not of the form '(<form> <form> ...)', the
+ * evaluation is performed inline without calling an evaluator.
+ *
+ * The following macros should be used in code which is read once
+ * (where the choice of evaluator is dynamic):
+ *
+ * SCM_I_XEVAL corresponds to EVAL, but uses ceval *or* deval depending on the
+ * debugging mode.
+ *
+ * SCM_I_XEVALCAR corresponds to EVALCAR, but uses ceval *or* deval depending
+ * on the debugging mode.
+ *
+ * The main motivation for keeping this plethora is efficiency
+ * together with maintainability (=> locality of code).
*/
-static SCM
-build_binding_list (SCM names, SCM inits)
+static SCM ceval (SCM x, SCM env);
+static SCM deval (SCM x, SCM env);
+#define CEVAL ceval
+
+
+#define SCM_I_EVALIM2(x) \
+ ((scm_is_eq ((x), SCM_EOL) \
+ ? syntax_error (s_empty_combination, (x), SCM_UNDEFINED), 0 \
+ : 0), \
+ (x))
+
+#define SCM_I_EVALIM(x, env) (SCM_ILOCP (x) \
+ ? *scm_ilookup ((x), (env)) \
+ : SCM_I_EVALIM2(x))
+
+#define SCM_I_XEVAL(x, env) \
+ (SCM_IMP (x) \
+ ? SCM_I_EVALIM2 (x) \
+ : (SCM_VARIABLEP (x) \
+ ? SCM_VARIABLE_REF (x) \
+ : (scm_is_pair (x) \
+ ? (scm_debug_mode_p \
+ ? deval ((x), (env)) \
+ : ceval ((x), (env))) \
+ : (x))))
+
+#define SCM_I_XEVALCAR(x, env) \
+ (SCM_IMP (SCM_CAR (x)) \
+ ? SCM_I_EVALIM (SCM_CAR (x), (env)) \
+ : (SCM_VARIABLEP (SCM_CAR (x)) \
+ ? SCM_VARIABLE_REF (SCM_CAR (x)) \
+ : (scm_is_pair (SCM_CAR (x)) \
+ ? (scm_debug_mode_p \
+ ? deval (SCM_CAR (x), (env)) \
+ : ceval (SCM_CAR (x), (env))) \
+ : (!scm_is_symbol (SCM_CAR (x)) \
+ ? SCM_CAR (x) \
+ : *scm_lookupcar ((x), (env), 1)))))
+
+#define EVAL(x, env) \
+ (SCM_IMP (x) \
+ ? SCM_I_EVALIM ((x), (env)) \
+ : (SCM_VARIABLEP (x) \
+ ? SCM_VARIABLE_REF (x) \
+ : (scm_is_pair (x) \
+ ? CEVAL ((x), (env)) \
+ : (x))))
+
+#define EVALCAR(x, env) \
+ (SCM_IMP (SCM_CAR (x)) \
+ ? SCM_I_EVALIM (SCM_CAR (x), (env)) \
+ : (SCM_VARIABLEP (SCM_CAR (x)) \
+ ? SCM_VARIABLE_REF (SCM_CAR (x)) \
+ : (scm_is_pair (SCM_CAR (x)) \
+ ? CEVAL (SCM_CAR (x), (env)) \
+ : (!scm_is_symbol (SCM_CAR (x)) \
+ ? SCM_CAR (x) \
+ : *scm_lookupcar ((x), (env), 1)))))
+
+scm_i_pthread_mutex_t source_mutex;
+
+
+/* Lookup a given local variable in an environment. The local variable is
+ * given as an iloc, that is a triple <frame, binding, last?>, where frame
+ * indicates the relative number of the environment frame (counting upwards
+ * from the innermost environment frame), binding indicates the number of the
+ * binding within the frame, and last? (which is extracted from the iloc using
+ * the macro SCM_ICDRP) indicates whether the binding forms the binding at the
+ * very end of the improper list of bindings. */
+SCM *
+scm_ilookup (SCM iloc, SCM env)
{
- SCM bindings = SCM_EOL;
- while (!SCM_NULLP (names))
- {
- SCM binding = scm_list_2 (SCM_CAR (names), SCM_CAR (inits));
- bindings = scm_cons (binding, bindings);
- names = SCM_CDR (names);
- inits = SCM_CDR (inits);
- }
- return bindings;
+ unsigned int frame_nr = SCM_IFRAME (iloc);
+ unsigned int binding_nr = SCM_IDIST (iloc);
+ SCM frames = env;
+ SCM bindings;
+
+ for (; 0 != frame_nr; --frame_nr)
+ frames = SCM_CDR (frames);
+
+ bindings = SCM_CAR (frames);
+ for (; 0 != binding_nr; --binding_nr)
+ bindings = SCM_CDR (bindings);
+
+ if (SCM_ICDRP (iloc))
+ return SCM_CDRLOC (bindings);
+ return SCM_CARLOC (SCM_CDR (bindings));
}
-static SCM
-unmemocopy (SCM x, SCM env)
+
+SCM_SYMBOL (scm_unbound_variable_key, "unbound-variable");
+
+static void error_unbound_variable (SCM symbol) SCM_NORETURN;
+static void error_defined_variable (SCM symbol) SCM_NORETURN;
+
+/* Call this for variables that are unfound.
+ */
+static void
+error_unbound_variable (SCM symbol)
{
- SCM ls, z;
- SCM p;
+ scm_error (scm_unbound_variable_key, NULL,
+ "Unbound variable: ~S",
+ scm_list_1 (symbol), SCM_BOOL_F);
+}
- if (SCM_VECTORP (x))
- {
- return scm_list_2 (scm_sym_quote, x);
- }
- else if (!SCM_CONSP (x))
- return x;
+/* Call this for variables that are found but contain SCM_UNDEFINED.
+ */
+static void
+error_defined_variable (SCM symbol)
+{
+ /* We use the 'unbound-variable' key here as well, since it
+ basically is the same kind of error, with a slight variation in
+ the displayed message.
+ */
+ scm_error (scm_unbound_variable_key, NULL,
+ "Variable used before given a value: ~S",
+ scm_list_1 (symbol), SCM_BOOL_F);
+}
- p = scm_whash_lookup (scm_source_whash, x);
- switch (SCM_ITAG7 (SCM_CAR (x)))
- {
- case SCM_BIT7 (SCM_IM_AND):
- ls = z = scm_cons (scm_sym_and, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_BEGIN):
- ls = z = scm_cons (scm_sym_begin, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_CASE):
- ls = z = scm_cons (scm_sym_case, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_COND):
- ls = z = scm_cons (scm_sym_cond, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_DO):
- {
- /* format: (#@do (i1 ... ik) (nk nk-1 ...) (test) (body) s1 ... sk),
- * where ix is an initializer for a local variable, nx is the name of
- * the local variable, test is the test clause of the do loop, body is
- * the body of the do loop and sx are the step clauses for the local
- * variables. */
- SCM names, inits, test, memoized_body, steps, bindings;
-
- x = SCM_CDR (x);
- inits = scm_reverse (unmemocopy (SCM_CAR (x), env));
- x = SCM_CDR (x);
- names = SCM_CAR (x);
- env = SCM_EXTEND_ENV (names, SCM_EOL, env);
- x = SCM_CDR (x);
- test = unmemocopy (SCM_CAR (x), env);
- x = SCM_CDR (x);
- memoized_body = SCM_CAR (x);
- x = SCM_CDR (x);
- steps = scm_reverse (unmemocopy (x, env));
-
- /* build transformed binding list */
- bindings = SCM_EOL;
- while (!SCM_NULLP (names))
- {
- SCM name = SCM_CAR (names);
- SCM init = SCM_CAR (inits);
- SCM step = SCM_CAR (steps);
- step = SCM_EQ_P (step, name) ? SCM_EOL : scm_list_1 (step);
- bindings = scm_cons (scm_cons2 (name, init, step), bindings);
+/* The Lookup Car Race
+ - by Eva Luator
- names = SCM_CDR (names);
- inits = SCM_CDR (inits);
- steps = SCM_CDR (steps);
- }
- z = scm_cons (test, SCM_UNSPECIFIED);
- ls = scm_cons2 (scm_sym_do, bindings, z);
+ 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.
- x = scm_cons (SCM_BOOL_F, memoized_body);
- break;
- }
- case SCM_BIT7 (SCM_IM_IF):
- ls = z = scm_cons (scm_sym_if, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_LET):
- {
- /* format: (#@let (nk nk-1 ...) (i1 ... ik) b1 ...),
- * where nx is the name of a local variable, ix is an initializer for
- * the local variable and by are the body clauses. */
- SCM names, inits, bindings;
-
- x = SCM_CDR (x);
- names = SCM_CAR (x);
- x = SCM_CDR (x);
- inits = scm_reverse (unmemocopy (SCM_CAR (x), env));
- env = SCM_EXTEND_ENV (names, SCM_EOL, env);
-
- bindings = build_binding_list (names, inits);
- z = scm_cons (bindings, SCM_UNSPECIFIED);
- ls = scm_cons (scm_sym_let, z);
+ 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 variables), 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 the lookup procedure 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 following 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 variable 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 variable containing 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 what 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 receiving 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. */
+
+static SCM *
+scm_lookupcar1 (SCM vloc, SCM genv, int check)
+{
+ SCM env = genv;
+ register SCM *al, fl, var = SCM_CAR (vloc);
+ register SCM iloc = SCM_ILOC00;
+ for (; SCM_NIMP (env); env = SCM_CDR (env))
+ {
+ if (!scm_is_pair (SCM_CAR (env)))
break;
- }
- case SCM_BIT7 (SCM_IM_LETREC):
+ al = SCM_CARLOC (env);
+ for (fl = SCM_CAR (*al); SCM_NIMP (fl); fl = SCM_CDR (fl))
+ {
+ if (!scm_is_pair (fl))
+ {
+ if (scm_is_eq (fl, var))
+ {
+ if (!scm_is_eq (SCM_CAR (vloc), var))
+ goto race;
+ SCM_SET_CELL_WORD_0 (vloc, SCM_UNPACK (iloc) + SCM_ICDR);
+ return SCM_CDRLOC (*al);
+ }
+ else
+ break;
+ }
+ al = SCM_CDRLOC (*al);
+ if (scm_is_eq (SCM_CAR (fl), var))
+ {
+ if (SCM_UNBNDP (SCM_CAR (*al)))
+ error_defined_variable (var);
+ if (!scm_is_eq (SCM_CAR (vloc), var))
+ goto race;
+ SCM_SETCAR (vloc, iloc);
+ return SCM_CARLOC (*al);
+ }
+ iloc = SCM_PACK (SCM_UNPACK (iloc) + SCM_IDINC);
+ }
+ iloc = SCM_PACK ((~SCM_IDSTMSK) & (SCM_UNPACK(iloc) + SCM_IFRINC));
+ }
+ {
+ SCM top_thunk, real_var;
+ if (SCM_NIMP (env))
{
- /* format: (#@letrec (nk nk-1 ...) (i1 ... ik) b1 ...),
- * where nx is the name of a local variable, ix is an initializer for
- * the local variable and by are the body clauses. */
- SCM names, inits, bindings;
-
- x = SCM_CDR (x);
- names = SCM_CAR (x);
- env = SCM_EXTEND_ENV (names, SCM_EOL, env);
- x = SCM_CDR (x);
- inits = scm_reverse (unmemocopy (SCM_CAR (x), env));
-
- bindings = build_binding_list (names, inits);
- z = scm_cons (bindings, SCM_UNSPECIFIED);
- ls = scm_cons (scm_sym_letrec, z);
- break;
+ top_thunk = SCM_CAR (env); /* env now refers to a
+ top level env thunk */
+ env = SCM_CDR (env);
}
- case SCM_BIT7 (SCM_IM_LETSTAR):
+ else
+ top_thunk = SCM_BOOL_F;
+ real_var = scm_sym2var (var, top_thunk, SCM_BOOL_F);
+ if (scm_is_false (real_var))
+ goto errout;
+
+ if (!scm_is_null (env) || SCM_UNBNDP (SCM_VARIABLE_REF (real_var)))
{
- SCM b, y;
- x = SCM_CDR (x);
- b = SCM_CAR (x);
- y = SCM_EOL;
- if SCM_IMP (b)
- {
- env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env);
- goto letstar;
- }
- y = z = scm_acons (SCM_CAR (b),
- unmemocar (
- scm_cons (unmemocopy (SCM_CADR (b), env), SCM_EOL), env),
- SCM_UNSPECIFIED);
- env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env);
- b = SCM_CDDR (b);
- if (SCM_IMP (b))
+ errout:
+ if (check)
{
- SCM_SETCDR (y, SCM_EOL);
- z = scm_cons (y, SCM_UNSPECIFIED);
- ls = scm_cons (scm_sym_let, z);
- break;
+ if (scm_is_null (env))
+ error_unbound_variable (var);
+ else
+ scm_misc_error (NULL, "Damaged environment: ~S",
+ scm_list_1 (var));
}
- do
+ else
{
- SCM_SETCDR (z, scm_acons (SCM_CAR (b),
- unmemocar (
- scm_list_1 (unmemocopy (SCM_CADR (b), env)), env),
- SCM_UNSPECIFIED));
- z = SCM_CDR (z);
- env = SCM_EXTEND_ENV (SCM_CAR (b), SCM_BOOL_F, env);
- b = SCM_CDDR (b);
+ /* A variable could not be found, but we shall
+ not throw an error. */
+ static SCM undef_object = SCM_UNDEFINED;
+ return &undef_object;
}
- while (SCM_NIMP (b));
- SCM_SETCDR (z, SCM_EOL);
- letstar:
- z = scm_cons (y, SCM_UNSPECIFIED);
- ls = scm_cons (scm_sym_letstar, z);
- break;
}
- case SCM_BIT7 (SCM_IM_OR):
- ls = z = scm_cons (scm_sym_or, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_LAMBDA):
- x = SCM_CDR (x);
- z = scm_cons (SCM_CAR (x), SCM_UNSPECIFIED);
- ls = scm_cons (scm_sym_lambda, z);
- env = SCM_EXTEND_ENV (SCM_CAR (x), SCM_EOL, env);
- break;
- case SCM_BIT7 (SCM_IM_QUOTE):
- ls = z = scm_cons (scm_sym_quote, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_IM_SET_X):
- ls = z = scm_cons (scm_sym_set_x, SCM_UNSPECIFIED);
- break;
- case SCM_BIT7 (SCM_MAKISYM (0)):
- z = SCM_CAR (x);
- switch (SCM_ISYMNUM (z))
- {
- case (SCM_ISYMNUM (SCM_IM_DEFINE)):
- {
- SCM n;
- x = SCM_CDR (x);
- n = SCM_CAR (x);
- z = scm_cons (n, SCM_UNSPECIFIED);
- ls = scm_cons (scm_sym_define, z);
- if (!SCM_NULLP (env))
- env = scm_cons (scm_cons (scm_cons (n, SCM_CAAR (env)),
- SCM_CDAR (env)),
- SCM_CDR (env));
- break;
- }
- 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;
- case (SCM_ISYMNUM (SCM_IM_FUTURE)):
- ls = z = scm_cons (scm_sym_future, SCM_UNSPECIFIED);
- x = SCM_CDR (x);
- goto loop;
- case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)):
- ls = z = scm_cons (scm_sym_at_call_with_values, SCM_UNSPECIFIED);
- goto loop;
- case (SCM_ISYMNUM (SCM_IM_ELSE)):
- ls = z = scm_cons (scm_sym_else, SCM_UNSPECIFIED);
- goto loop;
- default:
- /* appease the Sun compiler god: */ ;
- }
- default:
- ls = z = unmemocar (scm_cons (unmemocopy (SCM_CAR (x), env),
- SCM_UNSPECIFIED),
- env);
- }
-loop:
- x = SCM_CDR (x);
- while (SCM_CONSP (x))
- {
- SCM form = SCM_CAR (x);
- if (!SCM_ISYMP (form))
- {
- SCM copy = scm_cons (unmemocopy (form, env), SCM_UNSPECIFIED);
- SCM_SETCDR (z, unmemocar (copy, env));
- z = SCM_CDR (z);
- }
- else if (SCM_EQ_P (form, SCM_IM_ARROW))
- {
- SCM_SETCDR (z, scm_cons (scm_sym_arrow, SCM_UNSPECIFIED));
- z = SCM_CDR (z);
- }
- x = SCM_CDR (x);
- }
- SCM_SETCDR (z, x);
- if (!SCM_FALSEP (p))
- scm_whash_insert (scm_source_whash, ls, p);
- return ls;
+
+ if (!scm_is_eq (SCM_CAR (vloc), var))
+ {
+ /* 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 (SCM_VARIABLEP (var))
+ return SCM_VARIABLE_LOC (var);
+ if (SCM_ILOCP (var))
+ return scm_ilookup (var, genv);
+ /* We can't cope with anything else than variables 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;
+ }
+
+ SCM_SETCAR (vloc, real_var);
+ return SCM_VARIABLE_LOC (real_var);
+ }
}
+SCM *
+scm_lookupcar (SCM vloc, SCM genv, int check)
+{
+ SCM *loc = scm_lookupcar1 (vloc, genv, check);
+ if (loc == NULL)
+ abort ();
+ return loc;
+}
-SCM
-scm_unmemocopy (SCM x, SCM env)
+
+/* During execution, look up a symbol in the top level of the given local
+ * environment and return the corresponding variable object. If no binding
+ * for the symbol can be found, an 'Unbound variable' error is signalled. */
+static SCM
+lazy_memoize_variable (const SCM symbol, const SCM environment)
{
- if (!SCM_NULLP (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)));
+ const SCM top_level = scm_env_top_level (environment);
+ const SCM variable = scm_sym2var (symbol, top_level, SCM_BOOL_F);
+
+ if (scm_is_false (variable))
+ error_unbound_variable (symbol);
else
- return unmemocopy (x, env);
+ return variable;
}
-int
-scm_badargsp (SCM formals, SCM args)
+SCM
+scm_eval_car (SCM pair, SCM env)
{
- while (!SCM_NULLP (formals))
- {
- if (!SCM_CONSP (formals))
- return 0;
- if (SCM_NULLP (args))
- return 1;
- formals = SCM_CDR (formals);
- args = SCM_CDR (args);
- }
- return !SCM_NULLP (args) ? 1 : 0;
+ return SCM_I_XEVALCAR (pair, env);
}
-\f
+
SCM
scm_eval_args (SCM l, SCM env, SCM proc)
{
SCM results = SCM_EOL, *lloc = &results, res;
- while (SCM_CONSP (l))
+ while (scm_is_pair (l))
{
res = EVALCAR (l, env);
lloc = SCM_CDRLOC (*lloc);
l = SCM_CDR (l);
}
- if (!SCM_NULLP (l))
+ if (!scm_is_null (l))
scm_wrong_num_args (proc);
return results;
}
scm_eval_body (SCM code, SCM env)
{
SCM next;
+
again:
next = SCM_CDR (code);
- while (!SCM_NULLP (next))
+ while (!scm_is_null (next))
{
if (SCM_IMP (SCM_CAR (code)))
{
if (SCM_ISYMP (SCM_CAR (code)))
{
- scm_rec_mutex_lock (&source_mutex);
+ scm_dynwind_begin (0);
+ scm_i_dynwind_pthread_mutex_lock (&source_mutex);
/* check for race condition */
if (SCM_ISYMP (SCM_CAR (code)))
- code = scm_m_expand_body (code, env);
- scm_rec_mutex_unlock (&source_mutex);
+ m_expand_body (code, env);
+ scm_dynwind_end ();
goto again;
}
}
else
- SCM_XEVAL (SCM_CAR (code), env);
+ SCM_I_XEVAL (SCM_CAR (code), env);
code = next;
next = SCM_CDR (code);
}
- return SCM_XEVALCAR (code, env);
+ return SCM_I_XEVALCAR (code, env);
}
#endif /* !DEVAL */
#else /* !DEVAL */
-#undef SCM_CEVAL
-#define SCM_CEVAL scm_deval /* Substitute all uses of scm_ceval */
+#undef CEVAL
+#define CEVAL deval /* Substitute all uses of 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 \
do { \
if (scm_check_apply_p && SCM_TRAPS_P)\
if (SCM_APPLY_FRAME_P || (SCM_TRACE_P && PROCTRACEP (proc)))\
{\
- SCM tmp, tail = SCM_BOOL(SCM_TRACED_FRAME_P (debug)); \
+ SCM tmp, tail = scm_from_bool(SCM_TRACED_FRAME_P (debug)); \
SCM_SET_TRACED_FRAME (debug); \
SCM_TRAPS_P = 0;\
- if (SCM_CHEAPTRAPS_P)\
- {\
- tmp = scm_make_debugobj (&debug);\
- scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\
- }\
- else\
- {\
- int first;\
- tmp = scm_make_continuation (&first);\
- if (first)\
- scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\
- }\
+ tmp = scm_make_debugobj (&debug);\
+ scm_call_3 (SCM_APPLY_FRAME_HDLR, scm_sym_apply_frame, tmp, tail);\
SCM_TRAPS_P = 1;\
}\
} while (0)
+
#undef RETURN
#define RETURN(e) do { proc = (e); goto exit; } while (0)
+
#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 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.
+/* 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.
*/
/* scm_debug_eframe_size is the number of slots available for pseudo
long scm_debug_eframe_size;
-int scm_debug_mode, scm_check_entry_p, scm_check_apply_p, scm_check_exit_p;
+int scm_debug_mode_p;
+int scm_check_entry_p;
+int scm_check_apply_p;
+int scm_check_exit_p;
long scm_eval_stack;
scm_t_option scm_debug_opts[] = {
{ SCM_OPTION_BOOLEAN, "cheap", 1,
- "*Flyweight representation of the stack at traps." },
+ "*This option is now obsolete. Setting it has no effect." },
{ SCM_OPTION_BOOLEAN, "breakpoints", 0, "*Check for breakpoints." },
{ SCM_OPTION_BOOLEAN, "trace", 0, "*Trace mode." },
{ SCM_OPTION_BOOLEAN, "procnames", 1,
{ 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, "show-file-name", (unsigned long)SCM_BOOL_T, "Show file names and line numbers in backtraces when not `#f'. A value of `base' displays only base names, while `#t' displays full names."}
+ { SCM_OPTION_SCM, "show-file-name", (unsigned long)SCM_BOOL_T, "Show file names and line numbers in backtraces when not `#f'. A value of `base' displays only base names, while `#t' displays full names."},
+ { SCM_OPTION_BOOLEAN, "warn-deprecated", 0, "Warn when deprecated features are used." }
};
scm_t_option scm_evaluator_trap_table[] = {
#define FUNC_NAME s_scm_eval_options_interface
{
SCM ans;
- SCM_DEFER_INTS;
+
+ scm_dynwind_begin (0);
+ scm_dynwind_critical_section (SCM_BOOL_F);
ans = scm_options (setting,
scm_eval_opts,
SCM_N_EVAL_OPTIONS,
FUNC_NAME);
scm_eval_stack = SCM_EVAL_STACK * sizeof (void *);
- SCM_ALLOW_INTS;
+ scm_dynwind_end ();
+
return ans;
}
#undef FUNC_NAME
#define FUNC_NAME s_scm_evaluator_traps
{
SCM ans;
- SCM_DEFER_INTS;
+ SCM_CRITICAL_SECTION_START;
ans = scm_options (setting,
scm_evaluator_trap_table,
SCM_N_EVALUATOR_TRAPS,
FUNC_NAME);
+ /* njrev: same again. */
SCM_RESET_DEBUG_MODE;
- SCM_ALLOW_INTS;
+ SCM_CRITICAL_SECTION_END;
return ans;
}
#undef FUNC_NAME
static SCM
deval_args (SCM l, SCM env, SCM proc, SCM *lloc)
{
- SCM *results = lloc, res;
- while (SCM_CONSP (l))
+ SCM *results = lloc;
+ while (scm_is_pair (l))
{
- res = EVALCAR (l, env);
+ const SCM res = EVALCAR (l, env);
*lloc = scm_list_1 (res);
lloc = SCM_CDRLOC (*lloc);
l = SCM_CDR (l);
}
- if (!SCM_NULLP (l))
+ if (!scm_is_null (l))
scm_wrong_num_args (proc);
return *results;
}
+static void
+eval_letrec_inits (SCM env, SCM init_forms, SCM **init_values_eol)
+{
+ SCM argv[10];
+ int i = 0, imax = sizeof (argv) / sizeof (SCM);
+
+ while (!scm_is_null (init_forms))
+ {
+ if (imax == i)
+ {
+ eval_letrec_inits (env, init_forms, init_values_eol);
+ break;
+ }
+ argv[i++] = EVALCAR (init_forms, env);
+ init_forms = SCM_CDR (init_forms);
+ }
+
+ for (i--; i >= 0; i--)
+ {
+ **init_values_eol = scm_list_1 (argv[i]);
+ *init_values_eol = SCM_CDRLOC (**init_values_eol);
+ }
+}
+
#endif /* !DEVAL */
} while (0)
+#define SCM_VALIDATE_NON_EMPTY_COMBINATION(x) \
+ ASSERT_SYNTAX (!scm_is_eq ((x), SCM_EOL), s_empty_combination, x)
+
+
/* This is the evaluator. Like any real monster, it has three heads:
*
- * scm_ceval is the non-debugging evaluator, scm_deval is the debugging
- * version. Both are implemented using a common code base, using the
- * following mechanism: SCM_CEVAL is a macro, which is either defined to
- * scm_ceval or scm_deval. Thus, there is no function SCM_CEVAL, but the code
- * for SCM_CEVAL actually compiles to either scm_ceval or scm_deval. When
- * SCM_CEVAL is defined to scm_ceval, it is known that the macro DEVAL is not
- * defined. When SCM_CEVAL is defined to scm_deval, then the macro DEVAL is
- * known to be defined. Thus, in SCM_CEVAL parts for the debugging evaluator
+ * ceval is the non-debugging evaluator, deval is the debugging version. Both
+ * are implemented using a common code base, using the following mechanism:
+ * CEVAL is a macro, which is either defined to ceval or deval. Thus, there
+ * is no function CEVAL, but the code for CEVAL actually compiles to either
+ * ceval or deval. When CEVAL is defined to ceval, it is known that the macro
+ * DEVAL is not defined. When CEVAL is defined to deval, then the macro DEVAL
+ * is known to be defined. Thus, in CEVAL parts for the debugging evaluator
* are enclosed within #ifdef DEVAL ... #endif.
*
- * All three (scm_ceval, scm_deval and their common implementation SCM_CEVAL)
- * take two input parameters, x and env: x is a single expression to be
- * evalutated. env is the environment in which bindings are searched.
+ * All three (ceval, deval and their common implementation CEVAL) take two
+ * input parameters, x and env: x is a single expression to be evalutated.
+ * env is the environment in which bindings are searched.
*
- * x is known to be a cell (i. e. a pair or any other non-immediate). Since x
- * is a single expression, it is necessarily in a tail position. If x is just
- * a call to another function like in the expression (foo exp1 exp2 ...), the
- * realization of that call therefore _must_not_ increase stack usage (the
- * evaluation of exp1, exp2 etc., however, may do so). This is realized by
- * making extensive use of 'goto' statements within the evaluator: The gotos
- * replace recursive calls to SCM_CEVAL, thus re-using the same stack frame
- * that SCM_CEVAL was already using. If, however, x represents some form that
- * requires to evaluate a sequence of expressions like (begin exp1 exp2 ...),
- * then recursive calls to SCM_CEVAL are performed for all but the last
- * expression of that sequence. */
-
-#if 0
-SCM
-scm_ceval (SCM x, SCM env)
-{}
-#endif
-
-#if 0
-SCM
-scm_deval (SCM x, SCM env)
-{}
-#endif
+ * x is known to be a pair. Since x is a single expression, it is necessarily
+ * in a tail position. If x is just a call to another function like in the
+ * expression (foo exp1 exp2 ...), the realization of that call therefore
+ * _must_not_ increase stack usage (the evaluation of exp1, exp2 etc.,
+ * however, may do so). This is realized by making extensive use of 'goto'
+ * statements within the evaluator: The gotos replace recursive calls to
+ * CEVAL, thus re-using the same stack frame that CEVAL was already using.
+ * If, however, x represents some form that requires to evaluate a sequence of
+ * expressions like (begin exp1 exp2 ...), then recursive calls to CEVAL are
+ * performed for all but the last expression of that sequence. */
-SCM
-SCM_CEVAL (SCM x, SCM env)
+static SCM
+CEVAL (SCM x, SCM env)
{
SCM proc, arg1;
#ifdef DEVAL
scm_t_debug_frame debug;
scm_t_debug_info *debug_info_end;
- debug.prev = scm_last_debug_frame;
+ debug.prev = scm_i_last_debug_frame ();
debug.status = 0;
/*
* The debug.vect contains twice as much scm_t_debug_info frames as the
* sizeof (scm_t_debug_info));
debug.info = debug.vect;
debug_info_end = debug.vect + scm_debug_eframe_size;
- scm_last_debug_frame = &debug;
+ scm_i_set_last_debug_frame (&debug);
#endif
#ifdef EVAL_STACK_CHECKING
if (scm_stack_checking_enabled_p && SCM_STACK_OVERFLOW_P (&proc))
|| (SCM_BREAKPOINTS_P && scm_c_source_property_breakpoint_p (x)))
{
SCM stackrep;
- SCM tail = SCM_BOOL (SCM_TAILRECP (debug));
+ SCM tail = scm_from_bool (SCM_TAILRECP (debug));
SCM_SET_TAILREC (debug);
- if (SCM_CHEAPTRAPS_P)
- stackrep = scm_make_debugobj (&debug);
- else
- {
- int first;
- SCM val = scm_make_continuation (&first);
-
- if (first)
- stackrep = val;
- else
- {
- x = val;
- if (SCM_IMP (x))
- RETURN (x);
- else
- /* This gives the possibility for the debugger to
- modify the source expression before evaluation. */
- goto dispatch;
- }
- }
+ stackrep = scm_make_debugobj (&debug);
SCM_TRAPS_P = 0;
- scm_call_4 (SCM_ENTER_FRAME_HDLR,
- scm_sym_enter_frame,
- stackrep,
- tail,
- scm_unmemocopy (x, env));
+ stackrep = scm_call_4 (SCM_ENTER_FRAME_HDLR,
+ scm_sym_enter_frame,
+ stackrep,
+ tail,
+ unmemoize_expression (x, env));
SCM_TRAPS_P = 1;
+ if (scm_is_pair (stackrep) &&
+ scm_is_eq (SCM_CAR (stackrep), sym_instead))
+ {
+ /* This gives the possibility for the debugger to modify
+ the source expression before evaluation. */
+ x = SCM_CDR (stackrep);
+ if (SCM_IMP (x))
+ RETURN (x);
+ }
}
}
#endif
dispatch:
SCM_TICK;
- switch (SCM_TYP7 (x))
+ if (SCM_ISYMP (SCM_CAR (x)))
{
- case scm_tc7_symbol:
- /* Only happens when called at top level. */
- x = scm_cons (x, SCM_UNDEFINED);
- RETURN (*scm_lookupcar (x, env, 1));
+ switch (ISYMNUM (SCM_CAR (x)))
+ {
+ case (ISYMNUM (SCM_IM_AND)):
+ x = SCM_CDR (x);
+ while (!scm_is_null (SCM_CDR (x)))
+ {
+ SCM test_result = EVALCAR (x, env);
+ if (scm_is_false (test_result) || SCM_NILP (test_result))
+ RETURN (SCM_BOOL_F);
+ else
+ x = SCM_CDR (x);
+ }
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto carloop;
- case SCM_BIT7 (SCM_IM_AND):
- x = SCM_CDR (x);
- while (!SCM_NULLP (SCM_CDR (x)))
- {
- SCM test_result = EVALCAR (x, env);
- if (SCM_FALSEP (test_result) || SCM_NILP (test_result))
- RETURN (SCM_BOOL_F);
- else
- x = SCM_CDR (x);
- }
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto carloop;
+ case (ISYMNUM (SCM_IM_BEGIN)):
+ x = SCM_CDR (x);
+ if (scm_is_null (x))
+ RETURN (SCM_UNSPECIFIED);
- case SCM_BIT7 (SCM_IM_BEGIN):
- x = SCM_CDR (x);
- if (SCM_NULLP (x))
- RETURN (SCM_UNSPECIFIED);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ begin:
+ /* If we are on toplevel with a lookup closure, we need to sync
+ with the current module. */
+ if (scm_is_pair (env) && !scm_is_pair (SCM_CAR (env)))
+ {
+ UPDATE_TOPLEVEL_ENV (env);
+ while (!scm_is_null (SCM_CDR (x)))
+ {
+ EVALCAR (x, env);
+ UPDATE_TOPLEVEL_ENV (env);
+ x = SCM_CDR (x);
+ }
+ goto carloop;
+ }
+ else
+ goto nontoplevel_begin;
- begin:
- /* If we are on toplevel with a lookup closure, we need to sync
- with the current module. */
- if (SCM_CONSP (env) && !SCM_CONSP (SCM_CAR (env)))
- {
- UPDATE_TOPLEVEL_ENV (env);
- while (!SCM_NULLP (SCM_CDR (x)))
- {
- EVALCAR (x, env);
- UPDATE_TOPLEVEL_ENV (env);
- x = SCM_CDR (x);
- }
- goto carloop;
- }
- else
- goto nontoplevel_begin;
+ nontoplevel_begin:
+ while (!scm_is_null (SCM_CDR (x)))
+ {
+ const SCM form = SCM_CAR (x);
+ if (SCM_IMP (form))
+ {
+ if (SCM_ISYMP (form))
+ {
+ scm_dynwind_begin (0);
+ scm_i_dynwind_pthread_mutex_lock (&source_mutex);
+ /* check for race condition */
+ if (SCM_ISYMP (SCM_CAR (x)))
+ m_expand_body (x, env);
+ scm_dynwind_end ();
+ goto nontoplevel_begin;
+ }
+ else
+ SCM_VALIDATE_NON_EMPTY_COMBINATION (form);
+ }
+ else
+ (void) EVAL (form, env);
+ x = SCM_CDR (x);
+ }
- nontoplevel_begin:
- while (!SCM_NULLP (SCM_CDR (x)))
- {
- SCM form = SCM_CAR (x);
- if (SCM_IMP (form))
- {
- if (SCM_ISYMP (form))
- {
- scm_rec_mutex_lock (&source_mutex);
- /* check for race condition */
- if (SCM_ISYMP (SCM_CAR (x)))
- x = scm_m_expand_body (x, env);
- scm_rec_mutex_unlock (&source_mutex);
- goto nontoplevel_begin;
- }
- else
- SCM_VALIDATE_NON_EMPTY_COMBINATION (form);
- }
- else
- SCM_CEVAL (form, env);
- x = SCM_CDR (x);
- }
-
- carloop:
- {
- /* scm_eval last form in list */
- SCM last_form = SCM_CAR (x);
+ carloop:
+ {
+ /* scm_eval last form in list */
+ const SCM last_form = SCM_CAR (x);
- if (SCM_CONSP (last_form))
- {
- /* This is by far the most frequent case. */
- x = last_form;
- goto loop; /* tail recurse */
- }
- else if (SCM_IMP (last_form))
- RETURN (SCM_EVALIM (last_form, env));
- else if (SCM_VARIABLEP (last_form))
- RETURN (SCM_VARIABLE_REF (last_form));
- else if (SCM_SYMBOLP (last_form))
- RETURN (*scm_lookupcar (x, env, 1));
- else
- RETURN (last_form);
- }
+ if (scm_is_pair (last_form))
+ {
+ /* This is by far the most frequent case. */
+ x = last_form;
+ goto loop; /* tail recurse */
+ }
+ else if (SCM_IMP (last_form))
+ RETURN (SCM_I_EVALIM (last_form, env));
+ else if (SCM_VARIABLEP (last_form))
+ RETURN (SCM_VARIABLE_REF (last_form));
+ else if (scm_is_symbol (last_form))
+ RETURN (*scm_lookupcar (x, env, 1));
+ else
+ RETURN (last_form);
+ }
- case SCM_BIT7 (SCM_IM_CASE):
- x = SCM_CDR (x);
- {
- SCM key = EVALCAR (x, env);
- x = SCM_CDR (x);
- while (!SCM_NULLP (x))
- {
- SCM clause = SCM_CAR (x);
- SCM labels = SCM_CAR (clause);
- if (SCM_EQ_P (labels, SCM_IM_ELSE))
- {
- x = SCM_CDR (clause);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto begin;
- }
- while (!SCM_NULLP (labels))
- {
- SCM label = SCM_CAR (labels);
- if (SCM_EQ_P (label, key) || !SCM_FALSEP (scm_eqv_p (label, key)))
- {
- x = SCM_CDR (clause);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto begin;
- }
- labels = SCM_CDR (labels);
- }
- x = SCM_CDR (x);
- }
- }
- RETURN (SCM_UNSPECIFIED);
+ case (ISYMNUM (SCM_IM_CASE)):
+ x = SCM_CDR (x);
+ {
+ const SCM key = EVALCAR (x, env);
+ x = SCM_CDR (x);
+ while (!scm_is_null (x))
+ {
+ const SCM clause = SCM_CAR (x);
+ SCM labels = SCM_CAR (clause);
+ if (scm_is_eq (labels, SCM_IM_ELSE))
+ {
+ x = SCM_CDR (clause);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto begin;
+ }
+ while (!scm_is_null (labels))
+ {
+ const SCM label = SCM_CAR (labels);
+ if (scm_is_eq (label, key)
+ || scm_is_true (scm_eqv_p (label, key)))
+ {
+ x = SCM_CDR (clause);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto begin;
+ }
+ labels = SCM_CDR (labels);
+ }
+ x = SCM_CDR (x);
+ }
+ }
+ RETURN (SCM_UNSPECIFIED);
- case SCM_BIT7 (SCM_IM_COND):
- x = SCM_CDR (x);
- while (!SCM_NULLP (x))
- {
- SCM clause = SCM_CAR (x);
- if (SCM_EQ_P (SCM_CAR (clause), SCM_IM_ELSE))
- {
- x = SCM_CDR (clause);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto begin;
- }
- else
- {
- arg1 = EVALCAR (clause, env);
- if (!SCM_FALSEP (arg1) && !SCM_NILP (arg1))
- {
- x = SCM_CDR (clause);
- if (SCM_NULLP (x))
- RETURN (arg1);
- else if (!SCM_EQ_P (SCM_CAR (x), SCM_IM_ARROW))
- {
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto begin;
- }
- else
+ case (ISYMNUM (SCM_IM_COND)):
+ x = SCM_CDR (x);
+ while (!scm_is_null (x))
+ {
+ const SCM clause = SCM_CAR (x);
+ if (scm_is_eq (SCM_CAR (clause), SCM_IM_ELSE))
+ {
+ x = SCM_CDR (clause);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto begin;
+ }
+ else
+ {
+ arg1 = EVALCAR (clause, env);
+ /* SRFI 61 extended cond */
+ if (!scm_is_null (SCM_CDR (clause))
+ && !scm_is_null (SCM_CDDR (clause))
+ && scm_is_eq (SCM_CADDR (clause), SCM_IM_ARROW))
{
- proc = SCM_CDR (x);
- proc = EVALCAR (proc, env);
- PREP_APPLY (proc, scm_list_1 (arg1));
- ENTER_APPLY;
- goto evap1;
+ SCM xx, guard_result;
+ if (SCM_VALUESP (arg1))
+ arg1 = scm_struct_ref (arg1, SCM_INUM0);
+ else
+ arg1 = scm_list_1 (arg1);
+ xx = SCM_CDR (clause);
+ proc = EVALCAR (xx, env);
+ guard_result = SCM_APPLY (proc, arg1, SCM_EOL);
+ if (scm_is_true (guard_result)
+ && !SCM_NILP (guard_result))
+ {
+ proc = SCM_CDDR (xx);
+ proc = EVALCAR (proc, env);
+ PREP_APPLY (proc, arg1);
+ goto apply_proc;
+ }
}
- }
- x = SCM_CDR (x);
- }
- }
- RETURN (SCM_UNSPECIFIED);
-
-
- case SCM_BIT7 (SCM_IM_DO):
- x = SCM_CDR (x);
- {
- /* Compute the initialization values and the initial environment. */
- SCM init_forms = SCM_CAR (x);
- SCM init_values = SCM_EOL;
- while (!SCM_NULLP (init_forms))
- {
- init_values = scm_cons (EVALCAR (init_forms, env), init_values);
- init_forms = SCM_CDR (init_forms);
- }
- x = SCM_CDR (x);
- env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env);
- }
- x = SCM_CDR (x);
- {
- SCM test_form = SCM_CAR (x);
- SCM body_forms = SCM_CADR (x);
- SCM step_forms = SCM_CDDR (x);
-
- SCM test_result = EVALCAR (test_form, env);
-
- while (SCM_FALSEP (test_result) || SCM_NILP (test_result))
- {
- {
- /* Evaluate body forms. */
- SCM temp_forms;
- for (temp_forms = body_forms;
- !SCM_NULLP (temp_forms);
- temp_forms = SCM_CDR (temp_forms))
- {
- SCM form = SCM_CAR (temp_forms);
- /* Dirk:FIXME: We only need to eval forms, that may have a
- * side effect here. This is only true for forms that start
- * with a pair. All others are just constants. However,
- * since in the common case there is no constant expression
- * in a body of a do form, we just check for immediates here
- * and have SCM_CEVAL take care of other cases. In the long
- * run it would make sense to get rid of this test and have
- * the macro transformer of 'do' eliminate all forms that
- * have no sideeffect. */
- if (!SCM_IMP (form))
- SCM_CEVAL (form, env);
- }
- }
+ else if (scm_is_true (arg1) && !SCM_NILP (arg1))
+ {
+ x = SCM_CDR (clause);
+ if (scm_is_null (x))
+ RETURN (arg1);
+ else if (!scm_is_eq (SCM_CAR (x), SCM_IM_ARROW))
+ {
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto begin;
+ }
+ else
+ {
+ proc = SCM_CDR (x);
+ proc = EVALCAR (proc, env);
+ PREP_APPLY (proc, scm_list_1 (arg1));
+ ENTER_APPLY;
+ goto evap1;
+ }
+ }
+ x = SCM_CDR (x);
+ }
+ }
+ RETURN (SCM_UNSPECIFIED);
- {
- /* Evaluate the step expressions. */
- SCM temp_forms;
- SCM step_values = SCM_EOL;
- for (temp_forms = step_forms;
- !SCM_NULLP (temp_forms);
- temp_forms = SCM_CDR (temp_forms))
- {
- SCM value = EVALCAR (temp_forms, env);
- step_values = scm_cons (value, step_values);
- }
- env = SCM_EXTEND_ENV (SCM_CAAR (env),
- step_values,
- SCM_CDR (env));
- }
- test_result = EVALCAR (test_form, env);
- }
- }
- x = SCM_CDAR (x);
- if (SCM_NULLP (x))
- RETURN (SCM_UNSPECIFIED);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto nontoplevel_begin;
+ case (ISYMNUM (SCM_IM_DO)):
+ x = SCM_CDR (x);
+ {
+ /* Compute the initialization values and the initial environment. */
+ SCM init_forms = SCM_CAR (x);
+ SCM init_values = SCM_EOL;
+ while (!scm_is_null (init_forms))
+ {
+ init_values = scm_cons (EVALCAR (init_forms, env), init_values);
+ init_forms = SCM_CDR (init_forms);
+ }
+ x = SCM_CDR (x);
+ env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env);
+ }
+ x = SCM_CDR (x);
+ {
+ SCM test_form = SCM_CAR (x);
+ SCM body_forms = SCM_CADR (x);
+ SCM step_forms = SCM_CDDR (x);
+ SCM test_result = EVALCAR (test_form, env);
- case SCM_BIT7 (SCM_IM_IF):
- x = SCM_CDR (x);
- {
- SCM test_result = EVALCAR (x, env);
- x = SCM_CDR (x); /* then expression */
- if (SCM_FALSEP (test_result) || SCM_NILP (test_result))
- {
- x = SCM_CDR (x); /* else expression */
- if (SCM_NULLP (x))
- RETURN (SCM_UNSPECIFIED);
- }
- }
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto carloop;
+ while (scm_is_false (test_result) || SCM_NILP (test_result))
+ {
+ {
+ /* Evaluate body forms. */
+ SCM temp_forms;
+ for (temp_forms = body_forms;
+ !scm_is_null (temp_forms);
+ temp_forms = SCM_CDR (temp_forms))
+ {
+ SCM form = SCM_CAR (temp_forms);
+ /* Dirk:FIXME: We only need to eval forms that may have
+ * a side effect here. This is only true for forms that
+ * start with a pair. All others are just constants.
+ * Since with the current memoizer 'form' may hold a
+ * constant, we call EVAL here to handle the constant
+ * cases. In the long run it would make sense to have
+ * the macro transformer of 'do' eliminate all forms
+ * that have no sideeffect. Then instead of EVAL we
+ * could call CEVAL directly here. */
+ (void) EVAL (form, env);
+ }
+ }
+ {
+ /* Evaluate the step expressions. */
+ SCM temp_forms;
+ SCM step_values = SCM_EOL;
+ for (temp_forms = step_forms;
+ !scm_is_null (temp_forms);
+ temp_forms = SCM_CDR (temp_forms))
+ {
+ const SCM value = EVALCAR (temp_forms, env);
+ step_values = scm_cons (value, step_values);
+ }
+ env = SCM_EXTEND_ENV (SCM_CAAR (env),
+ step_values,
+ SCM_CDR (env));
+ }
- case SCM_BIT7 (SCM_IM_LET):
- x = SCM_CDR (x);
- {
- SCM init_forms = SCM_CADR (x);
- SCM init_values = SCM_EOL;
- do
- {
- init_values = scm_cons (EVALCAR (init_forms, env), init_values);
- init_forms = SCM_CDR (init_forms);
- }
- while (!SCM_NULLP (init_forms));
- env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env);
- }
- x = SCM_CDDR (x);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto nontoplevel_begin;
+ test_result = EVALCAR (test_form, env);
+ }
+ }
+ x = SCM_CDAR (x);
+ if (scm_is_null (x))
+ RETURN (SCM_UNSPECIFIED);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto nontoplevel_begin;
- case SCM_BIT7 (SCM_IM_LETREC):
- x = SCM_CDR (x);
- env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env);
- x = SCM_CDR (x);
- {
- SCM init_forms = SCM_CAR (x);
- SCM init_values = SCM_EOL;
- do
- {
- init_values = scm_cons (EVALCAR (init_forms, env), init_values);
- init_forms = SCM_CDR (init_forms);
- }
- while (!SCM_NULLP (init_forms));
- SCM_SETCDR (SCM_CAR (env), init_values);
- }
- x = SCM_CDR (x);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto nontoplevel_begin;
+ case (ISYMNUM (SCM_IM_IF)):
+ x = SCM_CDR (x);
+ {
+ SCM test_result = EVALCAR (x, env);
+ x = SCM_CDR (x); /* then expression */
+ if (scm_is_false (test_result) || SCM_NILP (test_result))
+ {
+ x = SCM_CDR (x); /* else expression */
+ if (scm_is_null (x))
+ RETURN (SCM_UNSPECIFIED);
+ }
+ }
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto carloop;
- case SCM_BIT7 (SCM_IM_LETSTAR):
- x = SCM_CDR (x);
- {
- SCM bindings = SCM_CAR (x);
- if (SCM_NULLP (bindings))
- env = SCM_EXTEND_ENV (SCM_EOL, SCM_EOL, env);
- else
- {
- do
- {
- SCM name = SCM_CAR (bindings);
- SCM init = SCM_CDR (bindings);
- env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env);
- bindings = SCM_CDR (init);
- }
- while (!SCM_NULLP (bindings));
- }
- }
- x = SCM_CDR (x);
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto nontoplevel_begin;
+ case (ISYMNUM (SCM_IM_LET)):
+ x = SCM_CDR (x);
+ {
+ SCM init_forms = SCM_CADR (x);
+ SCM init_values = SCM_EOL;
+ do
+ {
+ init_values = scm_cons (EVALCAR (init_forms, env), init_values);
+ init_forms = SCM_CDR (init_forms);
+ }
+ while (!scm_is_null (init_forms));
+ env = SCM_EXTEND_ENV (SCM_CAR (x), init_values, env);
+ }
+ x = SCM_CDDR (x);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto nontoplevel_begin;
- case SCM_BIT7 (SCM_IM_OR):
- x = SCM_CDR (x);
- while (!SCM_NULLP (SCM_CDR (x)))
- {
- SCM val = EVALCAR (x, env);
- if (!SCM_FALSEP (val) && !SCM_NILP (val))
- RETURN (val);
- else
- x = SCM_CDR (x);
- }
- PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
- goto carloop;
+ case (ISYMNUM (SCM_IM_LETREC)):
+ x = SCM_CDR (x);
+ env = SCM_EXTEND_ENV (SCM_CAR (x), undefineds, env);
+ x = SCM_CDR (x);
+ {
+ SCM init_forms = SCM_CAR (x);
+ SCM init_values = scm_list_1 (SCM_BOOL_T);
+ SCM *init_values_eol = SCM_CDRLOC (init_values);
+ eval_letrec_inits (env, init_forms, &init_values_eol);
+ SCM_SETCDR (SCM_CAR (env), SCM_CDR (init_values));
+ }
+ x = SCM_CDR (x);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto nontoplevel_begin;
- case SCM_BIT7 (SCM_IM_LAMBDA):
- RETURN (scm_closure (SCM_CDR (x), env));
+ case (ISYMNUM (SCM_IM_LETSTAR)):
+ x = SCM_CDR (x);
+ {
+ SCM bindings = SCM_CAR (x);
+ if (!scm_is_null (bindings))
+ {
+ do
+ {
+ SCM name = SCM_CAR (bindings);
+ SCM init = SCM_CDR (bindings);
+ env = SCM_EXTEND_ENV (name, EVALCAR (init, env), env);
+ bindings = SCM_CDR (init);
+ }
+ while (!scm_is_null (bindings));
+ }
+ }
+ x = SCM_CDR (x);
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto nontoplevel_begin;
- case SCM_BIT7 (SCM_IM_QUOTE):
- RETURN (SCM_CADR (x));
+ case (ISYMNUM (SCM_IM_OR)):
+ x = SCM_CDR (x);
+ while (!scm_is_null (SCM_CDR (x)))
+ {
+ SCM val = EVALCAR (x, env);
+ if (scm_is_true (val) && !SCM_NILP (val))
+ RETURN (val);
+ else
+ x = SCM_CDR (x);
+ }
+ PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
+ goto carloop;
- case SCM_BIT7 (SCM_IM_SET_X):
- x = SCM_CDR (x);
- {
- SCM *location;
- SCM variable = SCM_CAR (x);
- if (SCM_ILOCP (variable))
- location = scm_ilookup (variable, env);
- else if (SCM_VARIABLEP (variable))
- location = SCM_VARIABLE_LOC (variable);
- else /* (SCM_SYMBOLP (variable)) is known to be true */
- location = scm_lookupcar (x, env, 1);
- x = SCM_CDR (x);
- *location = EVALCAR (x, env);
- }
- RETURN (SCM_UNSPECIFIED);
+ case (ISYMNUM (SCM_IM_LAMBDA)):
+ RETURN (scm_closure (SCM_CDR (x), env));
- /* new syntactic forms go here. */
- case SCM_BIT7 (SCM_MAKISYM (0)):
- proc = SCM_CAR (x);
- switch (SCM_ISYMNUM (proc))
- {
+ case (ISYMNUM (SCM_IM_QUOTE)):
+ RETURN (SCM_CDR (x));
- case (SCM_ISYMNUM (SCM_IM_DEFINE)):
- /* Top level defines are handled directly by the memoizer and thus
- * will never generate memoized code with SCM_IM_DEFINE. Internal
- * defines which occur at valid positions will be transformed into
- * letrec expressions. Thus, whenever the executor detects
- * SCM_IM_DEFINE, this must come from an internal definition at an
- * illegal position. */
- scm_misc_error (NULL, "Bad define placement", SCM_EOL);
+ case (ISYMNUM (SCM_IM_SET_X)):
+ x = SCM_CDR (x);
+ {
+ SCM *location;
+ SCM variable = SCM_CAR (x);
+ if (SCM_ILOCP (variable))
+ location = scm_ilookup (variable, env);
+ else if (SCM_VARIABLEP (variable))
+ location = SCM_VARIABLE_LOC (variable);
+ else
+ {
+ /* (scm_is_symbol (variable)) is known to be true */
+ variable = lazy_memoize_variable (variable, env);
+ SCM_SETCAR (x, variable);
+ location = SCM_VARIABLE_LOC (variable);
+ }
+ x = SCM_CDR (x);
+ *location = EVALCAR (x, env);
+ }
+ RETURN (SCM_UNSPECIFIED);
- case (SCM_ISYMNUM (SCM_IM_APPLY)):
+ case (ISYMNUM (SCM_IM_APPLY)):
+ /* Evaluate the procedure to be applied. */
x = SCM_CDR (x);
proc = EVALCAR (x, env);
PREP_APPLY (proc, SCM_EOL);
+
+ /* Evaluate the argument holding the list of arguments */
x = SCM_CDR (x);
arg1 = EVALCAR (x, env);
}
- case (SCM_ISYMNUM (SCM_IM_CONT)):
+ case (ISYMNUM (SCM_IM_CONT)):
{
int first;
SCM val = scm_make_continuation (&first);
{
arg1 = val;
proc = SCM_CDR (x);
- proc = scm_eval_car (proc, env);
+ proc = EVALCAR (proc, env);
PREP_APPLY (proc, scm_list_1 (arg1));
ENTER_APPLY;
goto evap1;
}
- case (SCM_ISYMNUM (SCM_IM_DELAY)):
+ case (ISYMNUM (SCM_IM_DELAY)):
RETURN (scm_makprom (scm_closure (SCM_CDR (x), env)));
-
- case (SCM_ISYMNUM (SCM_IM_FUTURE)):
+#if 0
+ /* See futures.h for a comment why futures are not enabled.
+ */
+ case (ISYMNUM (SCM_IM_FUTURE)):
RETURN (scm_i_make_future (scm_closure (SCM_CDR (x), env)));
+#endif
-
- /* PLACEHOLDER for case (SCM_ISYMNUM (SCM_IM_DISPATCH)): The
- following code (type_dispatch) is intended to be the tail
- of the case clause for the internal macro
- SCM_IM_DISPATCH. Please don't remove it from this
- location without discussing it with Mikael
+ /* PLACEHOLDER for case (ISYMNUM (SCM_IM_DISPATCH)): The following
+ code (type_dispatch) is intended to be the tail of the case
+ clause for the internal macro SCM_IM_DISPATCH. Please don't
+ remove it from this location without discussing it with Mikael
<djurfeldt@nada.kth.se> */
/* The type dispatch code is duplicated below
{
SCM z = SCM_CDDR (x);
SCM tmp = SCM_CADR (z);
- specializers = SCM_INUM (SCM_CAR (z));
+ specializers = scm_to_ulong (SCM_CAR (z));
/* Compute a hash value for searching the method cache. There
* are two variants for computing the hash value, a (rather)
* complicated one, and a simple one. For the complicated one
* explained below, tmp holds a number that is used in the
* computation. */
- if (SCM_INUMP (tmp))
+ if (scm_is_simple_vector (tmp))
+ {
+ /* This method of determining the hash value is much
+ * simpler: Set the hash value to zero and just perform a
+ * linear search through the method cache. */
+ method_cache = tmp;
+ mask = (unsigned long int) ((long) -1);
+ hash_value = 0;
+ cache_end_pos = SCM_SIMPLE_VECTOR_LENGTH (method_cache);
+ }
+ else
{
/* Use the signature of the actual arguments to determine
* the hash value. This is done as follows: Each class has
* where dispatch is called, such that hopefully the hash
* value that is computed will directly point to the right
* method in the method cache. */
- unsigned long int hashset = SCM_INUM (tmp);
+ unsigned long int hashset = scm_to_ulong (tmp);
unsigned long int counter = specializers + 1;
SCM tmp_arg = arg1;
hash_value = 0;
- while (!SCM_NULLP (tmp_arg) && counter != 0)
+ while (!scm_is_null (tmp_arg) && counter != 0)
{
SCM class = scm_class_of (SCM_CAR (tmp_arg));
hash_value += SCM_INSTANCE_HASH (class, hashset);
}
z = SCM_CDDR (z);
method_cache = SCM_CADR (z);
- mask = SCM_INUM (SCM_CAR (z));
+ mask = scm_to_ulong (SCM_CAR (z));
hash_value &= mask;
cache_end_pos = hash_value;
}
- else
- {
- /* This method of determining the hash value is much
- * simpler: Set the hash value to zero and just perform a
- * linear search through the method cache. */
- method_cache = tmp;
- mask = (unsigned long int) ((long) -1);
- hash_value = 0;
- cache_end_pos = SCM_VECTOR_LENGTH (method_cache);
- }
}
{
do
{
SCM args = arg1; /* list of arguments */
- z = SCM_VELTS (method_cache)[hash_value];
- while (!SCM_NULLP (args))
+ z = SCM_SIMPLE_VECTOR_REF (method_cache, hash_value);
+ while (!scm_is_null (args))
{
/* More arguments than specifiers => CLASS != ENV */
SCM class_of_arg = scm_class_of (SCM_CAR (args));
- if (!SCM_EQ_P (class_of_arg, SCM_CAR (z)))
+ if (!scm_is_eq (class_of_arg, SCM_CAR (z)))
goto next_method;
args = SCM_CDR (args);
z = SCM_CDR (z);
}
/* Fewer arguments than specifiers => CAR != ENV */
- if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z)))
+ if (scm_is_null (SCM_CAR (z)) || scm_is_pair (SCM_CAR (z)))
goto apply_cmethod;
next_method:
hash_value = (hash_value + 1) & mask;
}
- case (SCM_ISYMNUM (SCM_IM_SLOT_REF)):
+ case (ISYMNUM (SCM_IM_SLOT_REF)):
x = SCM_CDR (x);
{
SCM instance = EVALCAR (x, env);
- unsigned long int slot = SCM_INUM (SCM_CADR (x));
+ unsigned long int slot = SCM_I_INUM (SCM_CDR (x));
RETURN (SCM_PACK (SCM_STRUCT_DATA (instance) [slot]));
}
- case (SCM_ISYMNUM (SCM_IM_SLOT_SET_X)):
+ case (ISYMNUM (SCM_IM_SLOT_SET_X)):
x = SCM_CDR (x);
{
SCM instance = EVALCAR (x, env);
- unsigned long int slot = SCM_INUM (SCM_CADR (x));
+ unsigned long int slot = SCM_I_INUM (SCM_CADR (x));
SCM value = EVALCAR (SCM_CDDR (x), env);
SCM_STRUCT_DATA (instance) [slot] = SCM_UNPACK (value);
RETURN (SCM_UNSPECIFIED);
#if SCM_ENABLE_ELISP
- case (SCM_ISYMNUM (SCM_IM_NIL_COND)):
+ case (ISYMNUM (SCM_IM_NIL_COND)):
{
SCM test_form = SCM_CDR (x);
x = SCM_CDR (test_form);
while (!SCM_NULL_OR_NIL_P (x))
{
SCM test_result = EVALCAR (test_form, env);
- if (!(SCM_FALSEP (test_result)
+ if (!(scm_is_false (test_result)
|| SCM_NULL_OR_NIL_P (test_result)))
{
- if (SCM_EQ_P (SCM_CAR (x), SCM_UNSPECIFIED))
+ if (scm_is_eq (SCM_CAR (x), SCM_UNSPECIFIED))
RETURN (test_result);
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto carloop;
#endif /* SCM_ENABLE_ELISP */
- case (SCM_ISYMNUM (SCM_IM_BIND)):
+ case (ISYMNUM (SCM_IM_BIND)):
{
SCM vars, exps, vals;
vars = SCM_CAAR (x);
exps = SCM_CDAR (x);
vals = SCM_EOL;
- while (!SCM_NULLP (exps))
+ while (!scm_is_null (exps))
{
vals = scm_cons (EVALCAR (exps, env), vals);
exps = SCM_CDR (exps);
}
scm_swap_bindings (vars, vals);
- scm_dynwinds = scm_acons (vars, vals, scm_dynwinds);
+ scm_i_set_dynwinds (scm_acons (vars, vals, scm_i_dynwinds ()));
/* Ignore all but the last evaluation result. */
- for (x = SCM_CDR (x); !SCM_NULLP (SCM_CDR (x)); x = SCM_CDR (x))
+ for (x = SCM_CDR (x); !scm_is_null (SCM_CDR (x)); x = SCM_CDR (x))
{
- if (SCM_CONSP (SCM_CAR (x)))
- SCM_CEVAL (SCM_CAR (x), env);
+ if (scm_is_pair (SCM_CAR (x)))
+ CEVAL (SCM_CAR (x), env);
}
proc = EVALCAR (x, env);
- scm_dynwinds = SCM_CDR (scm_dynwinds);
+ scm_i_set_dynwinds (SCM_CDR (scm_i_dynwinds ()));
scm_swap_bindings (vars, vals);
RETURN (proc);
}
- case (SCM_ISYMNUM (SCM_IM_CALL_WITH_VALUES)):
+ case (ISYMNUM (SCM_IM_CALL_WITH_VALUES)):
{
SCM producer;
default:
- goto evapply;
+ break;
}
-
- default:
- proc = x;
- goto evapply;
-
- case scm_tc7_vector:
- case scm_tc7_wvect:
-#if SCM_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:
-#if SCM_SIZEOF_LONG_LONG != 0
- case scm_tc7_llvect:
-#endif
-#endif
- case scm_tc7_number:
- case scm_tc7_string:
- case scm_tc7_smob:
- case scm_tcs_closures:
- case scm_tc7_cclo:
- case scm_tc7_pws:
- case scm_tcs_subrs:
- case scm_tcs_struct:
- RETURN (x);
-
- case scm_tc7_variable:
- RETURN (SCM_VARIABLE_REF(x));
-
- case SCM_BIT7 (SCM_ILOC00):
- proc = *scm_ilookup (SCM_CAR (x), env);
- goto checkmacro;
-
- case scm_tcs_cons_nimcar:
- if (SCM_SYMBOLP (SCM_CAR (x)))
+ }
+ else
+ {
+ if (SCM_VARIABLEP (SCM_CAR (x)))
+ proc = SCM_VARIABLE_REF (SCM_CAR (x));
+ else if (SCM_ILOCP (SCM_CAR (x)))
+ proc = *scm_ilookup (SCM_CAR (x), env);
+ else if (scm_is_pair (SCM_CAR (x)))
+ proc = CEVAL (SCM_CAR (x), env);
+ else if (scm_is_symbol (SCM_CAR (x)))
{
SCM orig_sym = SCM_CAR (x);
{
SCM_SET_MACROEXP (debug);
#endif
arg1 = SCM_APPLY (SCM_MACRO_CODE (proc), x,
- scm_cons (env, scm_listofnull));
-
+ scm_cons (env, scm_listofnull));
#ifdef DEVAL
SCM_CLEAR_MACROEXP (debug);
#endif
{
case 3:
case 2:
- if (scm_ilength (arg1) <= 0)
+ if (!scm_is_pair (arg1))
arg1 = scm_list_2 (SCM_IM_BEGIN, arg1);
+
+ assert (!scm_is_eq (x, SCM_CAR (arg1))
+ && !scm_is_eq (x, SCM_CDR (arg1)));
+
#ifdef DEVAL
if (!SCM_CLOSUREP (SCM_MACRO_CODE (proc)))
{
- SCM_DEFER_INTS;
+ SCM_CRITICAL_SECTION_START;
SCM_SETCAR (x, SCM_CAR (arg1));
SCM_SETCDR (x, SCM_CDR (arg1));
- SCM_ALLOW_INTS;
+ SCM_CRITICAL_SECTION_END;
goto dispatch;
}
/* Prevent memoizing of debug info expression. */
SCM_CAR (x),
SCM_CDR (x));
#endif
- SCM_DEFER_INTS;
+ SCM_CRITICAL_SECTION_START;
SCM_SETCAR (x, SCM_CAR (arg1));
SCM_SETCDR (x, SCM_CDR (arg1));
- SCM_ALLOW_INTS;
+ SCM_CRITICAL_SECTION_END;
PREP_APPLY (SCM_UNDEFINED, SCM_EOL);
goto loop;
#if SCM_ENABLE_DEPRECATED == 1
}
}
else
- proc = SCM_CEVAL (SCM_CAR (x), env);
+ proc = SCM_CAR (x);
- checkmacro:
if (SCM_MACROP (proc))
goto handle_a_macro;
}
-evapply: /* inputs: x, proc */
+ /* When reaching this part of the code, the following is granted: Variable x
+ * holds the first pair of an expression of the form (<function> arg ...).
+ * Variable proc holds the object that resulted from the evaluation of
+ * <function>. In the following, the arguments (if any) will be evaluated,
+ * and proc will be applied to them. If proc does not really hold a
+ * function object, this will be signalled as an error on the scheme
+ * level. If the number of arguments does not match the number of arguments
+ * that are allowed to be passed to proc, also an error on the scheme level
+ * will be signalled. */
PREP_APPLY (proc, SCM_EOL);
- if (SCM_NULLP (SCM_CDR (x))) {
+ if (scm_is_null (SCM_CDR (x))) {
ENTER_APPLY;
evap0:
SCM_ASRTGO (!SCM_IMP (proc), badfun);
case scm_tcs_closures:
{
const SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (SCM_CONSP (formals))
- goto umwrongnumargs;
+ if (scm_is_pair (formals))
+ goto wrongnumargs;
x = SCM_CLOSURE_BODY (proc);
env = SCM_EXTEND_ENV (formals, SCM_EOL, SCM_ENV (proc));
goto nontoplevel_begin;
case scm_tc7_cxr:
case scm_tc7_subr_3:
case scm_tc7_lsubr_2:
- umwrongnumargs:
- unmemocar (x, env);
+ wrongnumargs:
scm_wrong_num_args (proc);
default:
badfun:
/* must handle macros by here */
x = SCM_CDR (x);
- if (SCM_CONSP (x))
+ if (scm_is_pair (x))
arg1 = EVALCAR (x, env);
else
scm_wrong_num_args (proc);
x = SCM_CDR (x);
{
SCM arg2;
- if (SCM_NULLP (x))
+ if (scm_is_null (x))
{
ENTER_APPLY;
evap1: /* inputs: proc, arg1 */
case scm_tc7_subr_1o:
RETURN (SCM_SUBRF (proc) (arg1));
case scm_tc7_dsubr:
- if (SCM_INUMP (arg1))
+ if (SCM_I_INUMP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1))));
}
else if (SCM_REALP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1))));
}
else if (SCM_BIGP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1))));
}
- SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1,
- SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc)));
+ else if (SCM_FRACTIONP (arg1))
+ {
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1))));
+ }
+ SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1,
+ SCM_ARG1,
+ scm_i_symbol_chars (SCM_SNAME (proc)));
case scm_tc7_cxr:
- {
- unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc);
- do
- {
- SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1,
- SCM_SYMBOL_CHARS (SCM_SNAME (proc)));
- arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1);
- pattern >>= 2;
- } while (pattern);
- RETURN (arg1);
- }
+ RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc)));
case scm_tc7_rpsubr:
RETURN (SCM_BOOL_T);
case scm_tc7_asubr:
{
/* clos1: */
const SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (SCM_NULLP (formals)
- || (SCM_CONSP (formals) && SCM_CONSP (SCM_CDR (formals))))
- goto umwrongnumargs;
+ if (scm_is_null (formals)
+ || (scm_is_pair (formals) && scm_is_pair (SCM_CDR (formals))))
+ goto wrongnumargs;
x = SCM_CLOSURE_BODY (proc);
#ifdef DEVAL
env = SCM_EXTEND_ENV (formals,
goto badfun;
}
}
- if (SCM_CONSP (x))
+ if (scm_is_pair (x))
arg2 = EVALCAR (x, env);
else
scm_wrong_num_args (proc);
debug.info->a.args = scm_list_2 (arg1, arg2);
#endif
x = SCM_CDR (x);
- if (SCM_NULLP (x)) {
+ if (scm_is_null (x)) {
ENTER_APPLY;
evap2:
SCM_ASRTGO (!SCM_IMP (proc), badfun);
{
/* clos2: */
const SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (SCM_NULLP (formals)
- || (SCM_CONSP (formals)
- && (SCM_NULLP (SCM_CDR (formals))
- || (SCM_CONSP (SCM_CDR (formals))
- && SCM_CONSP (SCM_CDDR (formals))))))
- goto umwrongnumargs;
+ if (scm_is_null (formals)
+ || (scm_is_pair (formals)
+ && (scm_is_null (SCM_CDR (formals))
+ || (scm_is_pair (SCM_CDR (formals))
+ && scm_is_pair (SCM_CDDR (formals))))))
+ goto wrongnumargs;
#ifdef DEVAL
env = SCM_EXTEND_ENV (formals,
debug.info->a.args,
}
}
}
- if (!SCM_CONSP (x))
+ if (!scm_is_pair (x))
scm_wrong_num_args (proc);
#ifdef DEVAL
debug.info->a.args = scm_cons2 (arg1, arg2,
{ /* have 3 or more arguments */
#ifdef DEVAL
case scm_tc7_subr_3:
- if (!SCM_NULLP (SCM_CDR (x)))
+ if (!scm_is_null (SCM_CDR (x)))
scm_wrong_num_args (proc);
else
RETURN (SCM_SUBRF (proc) (arg1, arg2,
while (SCM_NIMP (arg2));
RETURN (arg1);
case scm_tc7_rpsubr:
- if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2)))
+ if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2)))
RETURN (SCM_BOOL_F);
arg1 = SCM_CDDR (debug.info->a.args);
do
{
- if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1))))
+ if (scm_is_false (SCM_SUBRF (proc) (arg2, SCM_CAR (arg1))))
RETURN (SCM_BOOL_F);
arg2 = SCM_CAR (arg1);
arg1 = SCM_CDR (arg1);
case scm_tcs_closures:
{
const SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (SCM_NULLP (formals)
- || (SCM_CONSP (formals)
- && (SCM_NULLP (SCM_CDR (formals))
- || (SCM_CONSP (SCM_CDR (formals))
+ if (scm_is_null (formals)
+ || (scm_is_pair (formals)
+ && (scm_is_null (SCM_CDR (formals))
+ || (scm_is_pair (SCM_CDR (formals))
&& scm_badargsp (SCM_CDDR (formals), x)))))
- goto umwrongnumargs;
+ goto wrongnumargs;
SCM_SET_ARGSREADY (debug);
env = SCM_EXTEND_ENV (formals,
debug.info->a.args,
}
#else /* DEVAL */
case scm_tc7_subr_3:
- if (!SCM_NULLP (SCM_CDR (x)))
+ if (!scm_is_null (SCM_CDR (x)))
scm_wrong_num_args (proc);
else
RETURN (SCM_SUBRF (proc) (arg1, arg2, EVALCAR (x, env)));
arg1 = SCM_SUBRF(proc)(arg1, EVALCAR(x, env));
x = SCM_CDR(x);
}
- while (SCM_NIMP (x));
+ while (!scm_is_null (x));
RETURN (arg1);
case scm_tc7_rpsubr:
- if (SCM_FALSEP (SCM_SUBRF (proc) (arg1, arg2)))
+ if (scm_is_false (SCM_SUBRF (proc) (arg1, arg2)))
RETURN (SCM_BOOL_F);
do
{
arg1 = EVALCAR (x, env);
- if (SCM_FALSEP (SCM_SUBRF (proc) (arg2, arg1)))
+ if (scm_is_false (SCM_SUBRF (proc) (arg2, arg1)))
RETURN (SCM_BOOL_F);
arg2 = arg1;
x = SCM_CDR (x);
}
- while (SCM_NIMP (x));
+ while (!scm_is_null (x));
RETURN (SCM_BOOL_T);
case scm_tc7_lsubr_2:
RETURN (SCM_SUBRF (proc) (arg1, arg2, scm_eval_args (x, env, proc)));
case scm_tcs_closures:
{
const SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (SCM_NULLP (formals)
- || (SCM_CONSP (formals)
- && (SCM_NULLP (SCM_CDR (formals))
- || (SCM_CONSP (SCM_CDR (formals))
+ if (scm_is_null (formals)
+ || (scm_is_pair (formals)
+ && (scm_is_null (SCM_CDR (formals))
+ || (scm_is_pair (SCM_CDR (formals))
&& scm_badargsp (SCM_CDDR (formals), x)))))
- goto umwrongnumargs;
+ goto wrongnumargs;
env = SCM_EXTEND_ENV (formals,
scm_cons2 (arg1,
arg2,
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
- {
- int first;
- SCM val = scm_make_continuation (&first);
-
- if (first)
- arg1 = val;
- else
- {
- proc = val;
- goto ret;
- }
- }
+ arg1 = scm_make_debugobj (&debug);
SCM_TRAPS_P = 0;
- scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc);
+ arg1 = scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc);
SCM_TRAPS_P = 1;
+ if (scm_is_pair (arg1) && scm_is_eq (SCM_CAR (arg1), sym_instead))
+ proc = SCM_CDR (arg1);
}
-ret:
- scm_last_debug_frame = debug.prev;
+ scm_i_set_last_debug_frame (debug.prev);
return proc;
#endif
}
SCM *lloc;
SCM_VALIDATE_NONEMPTYLIST (1, lst);
lloc = &lst;
- while (!SCM_NULLP (SCM_CDR (*lloc))) /* Perhaps should be
+ while (!scm_is_null (SCM_CDR (*lloc))) /* Perhaps should be
SCM_NULL_OR_NIL_P, but not
needed in 99.99% of cases,
and it could seriously hurt
#ifdef DEVAL
scm_t_debug_frame debug;
scm_t_debug_info debug_vect_body;
- debug.prev = scm_last_debug_frame;
+ debug.prev = scm_i_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;
+ scm_i_set_last_debug_frame (&debug);
#else
- if (SCM_DEBUGGINGP)
+ if (scm_debug_mode_p)
return scm_dapply (proc, arg1, args);
#endif
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_is_null (args))
{
- if (SCM_NULLP (arg1))
+ if (scm_is_null (arg1))
{
arg1 = SCM_UNDEFINED;
#ifdef DEVAL
#ifdef DEVAL
if (SCM_ENTER_FRAME_P && SCM_TRAPS_P)
{
- SCM tmp;
- if (SCM_CHEAPTRAPS_P)
- tmp = scm_make_debugobj (&debug);
- else
- {
- int first;
-
- tmp = scm_make_continuation (&first);
- if (!first)
- goto entap;
- }
+ SCM tmp = scm_make_debugobj (&debug);
SCM_TRAPS_P = 0;
scm_call_2 (SCM_ENTER_FRAME_HDLR, scm_sym_enter_frame, tmp);
SCM_TRAPS_P = 1;
}
-entap:
ENTER_APPLY;
#endif
tail:
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_2o:
- args = SCM_NULLP (args) ? SCM_UNDEFINED : SCM_CAR (args);
+ if (SCM_UNBNDP (arg1))
+ scm_wrong_num_args (proc);
+ if (scm_is_null (args))
+ args = SCM_UNDEFINED;
+ else
+ {
+ if (! scm_is_null (SCM_CDR (args)))
+ scm_wrong_num_args (proc);
+ args = SCM_CAR (args);
+ }
RETURN (SCM_SUBRF (proc) (arg1, args));
case scm_tc7_subr_2:
- if (SCM_NULLP (args) || !SCM_NULLP (SCM_CDR (args)))
+ if (scm_is_null (args) || !scm_is_null (SCM_CDR (args)))
scm_wrong_num_args (proc);
args = SCM_CAR (args);
RETURN (SCM_SUBRF (proc) (arg1, args));
if (SCM_UNBNDP (arg1))
scm_wrong_num_args (proc);
case scm_tc7_subr_1o:
- if (!SCM_NULLP (args))
+ if (!scm_is_null (args))
scm_wrong_num_args (proc);
else
RETURN (SCM_SUBRF (proc) (arg1));
case scm_tc7_dsubr:
- if (SCM_UNBNDP (arg1) || !SCM_NULLP (args))
+ if (SCM_UNBNDP (arg1) || !scm_is_null (args))
scm_wrong_num_args (proc);
- if (SCM_INUMP (arg1))
+ if (SCM_I_INUMP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1))));
}
else if (SCM_REALP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1))));
}
else if (SCM_BIGP (arg1))
- RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1))));
+ {
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1))));
+ }
+ else if (SCM_FRACTIONP (arg1))
+ {
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1))));
+ }
SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1,
- SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc)));
+ SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc)));
case scm_tc7_cxr:
- if (SCM_UNBNDP (arg1) || !SCM_NULLP (args))
+ if (SCM_UNBNDP (arg1) || !scm_is_null (args))
scm_wrong_num_args (proc);
- {
- unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc);
- do
- {
- SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1,
- SCM_SYMBOL_CHARS (SCM_SNAME (proc)));
- arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1);
- pattern >>= 2;
- } while (pattern);
- RETURN (arg1);
- }
+ RETURN (scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc)));
case scm_tc7_subr_3:
- if (SCM_NULLP (args)
- || SCM_NULLP (SCM_CDR (args))
- || !SCM_NULLP (SCM_CDDR (args)))
+ if (scm_is_null (args)
+ || scm_is_null (SCM_CDR (args))
+ || !scm_is_null (SCM_CDDR (args)))
scm_wrong_num_args (proc);
else
RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CADR (args)));
RETURN (SCM_SUBRF (proc) (SCM_UNBNDP (arg1) ? SCM_EOL : scm_cons (arg1, args)));
#endif
case scm_tc7_lsubr_2:
- if (!SCM_CONSP (args))
+ if (!scm_is_pair (args))
scm_wrong_num_args (proc);
else
RETURN (SCM_SUBRF (proc) (arg1, SCM_CAR (args), SCM_CDR (args)));
case scm_tc7_asubr:
- if (SCM_NULLP (args))
+ if (scm_is_null (args))
RETURN (SCM_SUBRF (proc) (arg1, SCM_UNDEFINED));
while (SCM_NIMP (args))
{
- SCM_ASSERT (SCM_CONSP (args), args, SCM_ARG2, "apply");
+ SCM_ASSERT (scm_is_pair (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))
+ if (scm_is_null (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))))
+ SCM_ASSERT (scm_is_pair (args), args, SCM_ARG2, "apply");
+ if (scm_is_false (SCM_SUBRF (proc) (arg1, SCM_CAR (args))))
RETURN (SCM_BOOL_F);
arg1 = SCM_CAR (args);
args = SCM_CDR (args);
else
{
SCM tl = args = scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED);
- for (arg1 = SCM_CDR (arg1); SCM_CONSP (arg1); arg1 = SCM_CDR (arg1))
+ for (arg1 = SCM_CDR (arg1); scm_is_pair (arg1); arg1 = SCM_CDR (arg1))
{
SCM_SETCDR (tl, scm_cons (SCM_CAR (arg1), SCM_UNSPECIFIED));
tl = SCM_CDR (tl);
proc = SCM_CLOSURE_BODY (proc);
again:
arg1 = SCM_CDR (proc);
- while (!SCM_NULLP (arg1))
+ while (!scm_is_null (arg1))
{
if (SCM_IMP (SCM_CAR (proc)))
{
if (SCM_ISYMP (SCM_CAR (proc)))
{
- scm_rec_mutex_lock (&source_mutex);
+ scm_dynwind_begin (0);
+ scm_i_dynwind_pthread_mutex_lock (&source_mutex);
/* check for race condition */
if (SCM_ISYMP (SCM_CAR (proc)))
- proc = scm_m_expand_body (proc, args);
- scm_rec_mutex_unlock (&source_mutex);
+ m_expand_body (proc, args);
+ scm_dynwind_end ();
goto again;
}
else
SCM_VALIDATE_NON_EMPTY_COMBINATION (SCM_CAR (proc));
}
else
- SCM_CEVAL (SCM_CAR (proc), args);
+ (void) EVAL (SCM_CAR (proc), args);
proc = arg1;
arg1 = SCM_CDR (proc);
}
goto badproc;
if (SCM_UNBNDP (arg1))
RETURN (SCM_SMOB_APPLY_0 (proc));
- else if (SCM_NULLP (args))
+ else if (scm_is_null (args))
RETURN (SCM_SMOB_APPLY_1 (proc, arg1));
- else if (SCM_NULLP (SCM_CDR (args)))
+ else if (scm_is_null (SCM_CDR (args)))
RETURN (SCM_SMOB_APPLY_2 (proc, arg1, SCM_CAR (args)));
else
RETURN (SCM_SMOB_APPLY_3 (proc, arg1, SCM_CAR (args), SCM_CDR (args)));
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
- {
- int first;
- SCM val = scm_make_continuation (&first);
-
- if (first)
- arg1 = val;
- else
- {
- proc = val;
- goto ret;
- }
- }
+ arg1 = scm_make_debugobj (&debug);
SCM_TRAPS_P = 0;
- scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc);
+ arg1 = scm_call_3 (SCM_EXIT_FRAME_HDLR, scm_sym_exit_frame, arg1, proc);
SCM_TRAPS_P = 1;
+ if (scm_is_pair (arg1) && scm_is_eq (SCM_CAR (arg1), sym_instead))
+ proc = SCM_CDR (arg1);
}
-ret:
- scm_last_debug_frame = debug.prev;
+ scm_i_set_last_debug_frame (debug.prev);
return proc;
#endif
}
scm_t_trampoline_0
scm_trampoline_0 (SCM proc)
{
+ scm_t_trampoline_0 trampoline;
+
if (SCM_IMP (proc))
return NULL;
- if (SCM_DEBUGGINGP)
- return scm_call_0;
+
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_0:
- return call_subr0_0;
+ trampoline = call_subr0_0;
+ break;
case scm_tc7_subr_1o:
- return call_subr1o_0;
+ trampoline = call_subr1o_0;
+ break;
case scm_tc7_lsubr:
- return call_lsubr_0;
+ trampoline = call_lsubr_0;
+ break;
case scm_tcs_closures:
{
SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (SCM_NULLP (formals) || !SCM_CONSP (formals))
- return scm_i_call_closure_0;
+ if (scm_is_null (formals) || !scm_is_pair (formals))
+ trampoline = scm_i_call_closure_0;
else
return NULL;
+ break;
}
case scm_tcs_struct:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
- return scm_call_generic_0;
+ trampoline = scm_call_generic_0;
else if (SCM_I_OPERATORP (proc))
- return scm_call_0;
- return NULL;
+ trampoline = scm_call_0;
+ else
+ return NULL;
+ break;
case scm_tc7_smob:
if (SCM_SMOB_APPLICABLE_P (proc))
- return SCM_SMOB_DESCRIPTOR (proc).apply_0;
+ trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_0;
else
return NULL;
+ break;
case scm_tc7_asubr:
case scm_tc7_rpsubr:
case scm_tc7_cclo:
case scm_tc7_pws:
- return scm_call_0;
+ trampoline = scm_call_0;
+ break;
default:
- return NULL; /* not applicable on one arg */
+ return NULL; /* not applicable on zero arguments */
}
+ /* We only reach this point if a valid trampoline was determined. */
+
+ /* If debugging is enabled, we want to see all calls to proc on the stack.
+ * Thus, we replace the trampoline shortcut with scm_call_0. */
+ if (scm_debug_mode_p)
+ return scm_call_0;
+ else
+ return trampoline;
}
static SCM
static SCM
call_dsubr_1 (SCM proc, SCM arg1)
{
- if (SCM_INUMP (arg1))
+ if (SCM_I_INUMP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) ((double) SCM_INUM (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) ((double) SCM_I_INUM (arg1))));
}
else if (SCM_REALP (arg1))
{
- RETURN (scm_make_real (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1))));
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (SCM_REAL_VALUE (arg1))));
}
else if (SCM_BIGP (arg1))
- RETURN (scm_make_real (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1))));
+ {
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_big2dbl (arg1))));
+ }
+ else if (SCM_FRACTIONP (arg1))
+ {
+ RETURN (scm_from_double (SCM_DSUBRF (proc) (scm_i_fraction2double (arg1))));
+ }
SCM_WTA_DISPATCH_1 (*SCM_SUBR_GENERIC (proc), arg1,
- SCM_ARG1, SCM_SYMBOL_CHARS (SCM_SNAME (proc)));
+ SCM_ARG1, scm_i_symbol_chars (SCM_SNAME (proc)));
}
static SCM
call_cxr_1 (SCM proc, SCM arg1)
{
- unsigned char pattern = (scm_t_bits) SCM_SUBRF (proc);
- do
- {
- SCM_ASSERT (SCM_CONSP (arg1), arg1, SCM_ARG1,
- SCM_SYMBOL_CHARS (SCM_SNAME (proc)));
- arg1 = (pattern & 1) ? SCM_CAR (arg1) : SCM_CDR (arg1);
- pattern >>= 2;
- } while (pattern);
- return arg1;
+ return scm_i_chase_pairs (arg1, (scm_t_bits) SCM_SUBRF (proc));
}
static SCM
scm_t_trampoline_1
scm_trampoline_1 (SCM proc)
{
+ scm_t_trampoline_1 trampoline;
+
if (SCM_IMP (proc))
return NULL;
- if (SCM_DEBUGGINGP)
- return scm_call_1;
+
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_1:
case scm_tc7_subr_1o:
- return call_subr1_1;
+ trampoline = call_subr1_1;
+ break;
case scm_tc7_subr_2o:
- return call_subr2o_1;
+ trampoline = call_subr2o_1;
+ break;
case scm_tc7_lsubr:
- return call_lsubr_1;
+ trampoline = call_lsubr_1;
+ break;
case scm_tc7_dsubr:
- return call_dsubr_1;
+ trampoline = call_dsubr_1;
+ break;
case scm_tc7_cxr:
- return call_cxr_1;
+ trampoline = call_cxr_1;
+ break;
case scm_tcs_closures:
{
SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (!SCM_NULLP (formals)
- && (!SCM_CONSP (formals) || !SCM_CONSP (SCM_CDR (formals))))
- return call_closure_1;
+ if (!scm_is_null (formals)
+ && (!scm_is_pair (formals) || !scm_is_pair (SCM_CDR (formals))))
+ trampoline = call_closure_1;
else
return NULL;
+ break;
}
case scm_tcs_struct:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
- return scm_call_generic_1;
+ trampoline = scm_call_generic_1;
else if (SCM_I_OPERATORP (proc))
- return scm_call_1;
- return NULL;
+ trampoline = scm_call_1;
+ else
+ return NULL;
+ break;
case scm_tc7_smob:
if (SCM_SMOB_APPLICABLE_P (proc))
- return SCM_SMOB_DESCRIPTOR (proc).apply_1;
+ trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_1;
else
return NULL;
+ break;
case scm_tc7_asubr:
case scm_tc7_rpsubr:
case scm_tc7_cclo:
case scm_tc7_pws:
- return scm_call_1;
+ trampoline = scm_call_1;
+ break;
default:
return NULL; /* not applicable on one arg */
}
+ /* We only reach this point if a valid trampoline was determined. */
+
+ /* If debugging is enabled, we want to see all calls to proc on the stack.
+ * Thus, we replace the trampoline shortcut with scm_call_1. */
+ if (scm_debug_mode_p)
+ return scm_call_1;
+ else
+ return trampoline;
}
static SCM
scm_t_trampoline_2
scm_trampoline_2 (SCM proc)
{
+ scm_t_trampoline_2 trampoline;
+
if (SCM_IMP (proc))
return NULL;
- if (SCM_DEBUGGINGP)
- return scm_call_2;
+
switch (SCM_TYP7 (proc))
{
case scm_tc7_subr_2:
case scm_tc7_subr_2o:
case scm_tc7_rpsubr:
case scm_tc7_asubr:
- return call_subr2_2;
+ trampoline = call_subr2_2;
+ break;
case scm_tc7_lsubr_2:
- return call_lsubr2_2;
+ trampoline = call_lsubr2_2;
+ break;
case scm_tc7_lsubr:
- return call_lsubr_2;
+ trampoline = call_lsubr_2;
+ break;
case scm_tcs_closures:
{
SCM formals = SCM_CLOSURE_FORMALS (proc);
- if (!SCM_NULLP (formals)
- && (!SCM_CONSP (formals)
- || (!SCM_NULLP (SCM_CDR (formals))
- && (!SCM_CONSP (SCM_CDR (formals))
- || !SCM_CONSP (SCM_CDDR (formals))))))
- return call_closure_2;
+ if (!scm_is_null (formals)
+ && (!scm_is_pair (formals)
+ || (!scm_is_null (SCM_CDR (formals))
+ && (!scm_is_pair (SCM_CDR (formals))
+ || !scm_is_pair (SCM_CDDR (formals))))))
+ trampoline = call_closure_2;
else
return NULL;
+ break;
}
case scm_tcs_struct:
if (SCM_OBJ_CLASS_FLAGS (proc) & SCM_CLASSF_PURE_GENERIC)
- return scm_call_generic_2;
+ trampoline = scm_call_generic_2;
else if (SCM_I_OPERATORP (proc))
- return scm_call_2;
- return NULL;
+ trampoline = scm_call_2;
+ else
+ return NULL;
+ break;
case scm_tc7_smob:
if (SCM_SMOB_APPLICABLE_P (proc))
- return SCM_SMOB_DESCRIPTOR (proc).apply_2;
+ trampoline = SCM_SMOB_DESCRIPTOR (proc).apply_2;
else
return NULL;
+ break;
case scm_tc7_cclo:
case scm_tc7_pws:
- return scm_call_2;
+ trampoline = scm_call_2;
+ break;
default:
return NULL; /* not applicable on two args */
}
+ /* We only reach this point if a valid trampoline was determined. */
+
+ /* If debugging is enabled, we want to see all calls to proc on the stack.
+ * Thus, we replace the trampoline shortcut with scm_call_2. */
+ if (scm_debug_mode_p)
+ return scm_call_2;
+ else
+ return trampoline;
}
/* Typechecking for multi-argument MAP and FOR-EACH.
SCM args,
const char *who)
{
- SCM const *ve = SCM_VELTS (argv);
long i;
- for (i = SCM_VECTOR_LENGTH (argv) - 1; i >= 1; i--)
+ for (i = SCM_SIMPLE_VECTOR_LENGTH (argv) - 1; i >= 1; i--)
{
- long elt_len = scm_ilength (ve[i]);
+ SCM elt = SCM_SIMPLE_VECTOR_REF (argv, i);
+ long elt_len = scm_ilength (elt);
if (elt_len < 0)
{
if (gf)
scm_apply_generic (gf, scm_cons (proc, args));
else
- scm_wrong_type_arg (who, i + 2, ve[i]);
+ scm_wrong_type_arg (who, i + 2, elt);
}
if (elt_len != len)
- scm_out_of_range_pos (who, ve[i], SCM_MAKINUM (i + 2));
+ scm_out_of_range_pos (who, elt, scm_from_long (i + 2));
}
-
- scm_remember_upto_here_1 (argv);
}
long i, len;
SCM res = SCM_EOL;
SCM *pres = &res;
- SCM const *ve = &args; /* Keep args from being optimized away. */
len = scm_ilength (arg1);
SCM_GASSERTn (len >= 0,
g_map, scm_cons2 (proc, arg1, args), SCM_ARG2, s_map);
SCM_VALIDATE_REST_ARGUMENT (args);
- if (SCM_NULLP (args))
+ if (scm_is_null (args))
{
scm_t_trampoline_1 call = scm_trampoline_1 (proc);
SCM_GASSERT2 (call, g_map, proc, arg1, SCM_ARG1, s_map);
}
return res;
}
- if (SCM_NULLP (SCM_CDR (args)))
+ if (scm_is_null (SCM_CDR (args)))
{
SCM arg2 = SCM_CAR (args);
int len2 = scm_ilength (arg2);
}
arg1 = scm_cons (arg1, args);
args = scm_vector (arg1);
- ve = SCM_VELTS (args);
check_map_args (args, len, g_map, proc, arg1, s_map);
while (1)
{
arg1 = SCM_EOL;
- for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--)
+ for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--)
{
- if (SCM_IMP (ve[i]))
+ SCM elt = SCM_SIMPLE_VECTOR_REF (args, i);
+ if (SCM_IMP (elt))
return res;
- arg1 = scm_cons (SCM_CAR (ve[i]), arg1);
- SCM_VECTOR_SET (args, i, SCM_CDR (ve[i]));
+ arg1 = scm_cons (SCM_CAR (elt), arg1);
+ SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt));
}
*pres = scm_list_1 (scm_apply (proc, arg1, SCM_EOL));
pres = SCM_CDRLOC (*pres);
scm_for_each (SCM proc, SCM arg1, SCM args)
#define FUNC_NAME s_for_each
{
- SCM const *ve = &args; /* Keep args from being optimized away. */
long i, len;
len = scm_ilength (arg1);
SCM_GASSERTn (len >= 0, g_for_each, scm_cons2 (proc, arg1, args),
SCM_ARG2, s_for_each);
SCM_VALIDATE_REST_ARGUMENT (args);
- if (SCM_NULLP (args))
+ if (scm_is_null (args))
{
scm_t_trampoline_1 call = scm_trampoline_1 (proc);
SCM_GASSERT2 (call, g_for_each, proc, arg1, SCM_ARG1, s_for_each);
}
return SCM_UNSPECIFIED;
}
- if (SCM_NULLP (SCM_CDR (args)))
+ if (scm_is_null (SCM_CDR (args)))
{
SCM arg2 = SCM_CAR (args);
int len2 = scm_ilength (arg2);
}
arg1 = scm_cons (arg1, args);
args = scm_vector (arg1);
- ve = SCM_VELTS (args);
check_map_args (args, len, g_for_each, proc, arg1, s_for_each);
while (1)
{
arg1 = SCM_EOL;
- for (i = SCM_VECTOR_LENGTH (args) - 1; i >= 0; i--)
+ for (i = SCM_SIMPLE_VECTOR_LENGTH (args) - 1; i >= 0; i--)
{
- if (SCM_IMP (ve[i]))
+ SCM elt = SCM_SIMPLE_VECTOR_REF (args, i);
+ if (SCM_IMP (elt))
return SCM_UNSPECIFIED;
- arg1 = scm_cons (SCM_CAR (ve[i]), arg1);
- SCM_VECTOR_SET (args, i, SCM_CDR (ve[i]));
+ arg1 = scm_cons (SCM_CAR (elt), arg1);
+ SCM_SIMPLE_VECTOR_SET (args, i, SCM_CDR (elt));
}
scm_apply (proc, arg1, SCM_EOL);
}
{
SCM_RETURN_NEWSMOB2 (scm_tc16_promise,
SCM_UNPACK (code),
- scm_make_rec_mutex ());
+ scm_make_recursive_mutex ());
+}
+
+static SCM
+promise_mark (SCM promise)
+{
+ scm_gc_mark (SCM_PROMISE_MUTEX (promise));
+ return SCM_PROMISE_DATA (promise);
}
static size_t
promise_free (SCM promise)
{
- scm_rec_mutex_free (SCM_PROMISE_MUTEX (promise));
return 0;
}
#define FUNC_NAME s_scm_force
{
SCM_VALIDATE_SMOB (1, promise, promise);
- scm_rec_mutex_lock (SCM_PROMISE_MUTEX (promise));
+ scm_lock_mutex (SCM_PROMISE_MUTEX (promise));
if (!SCM_PROMISE_COMPUTED_P (promise))
{
SCM ans = scm_call_0 (SCM_PROMISE_DATA (promise));
SCM_SET_PROMISE_COMPUTED (promise);
}
}
- scm_rec_mutex_unlock (SCM_PROMISE_MUTEX (promise));
+ scm_unlock_mutex (SCM_PROMISE_MUTEX (promise));
return SCM_PROMISE_DATA (promise);
}
#undef FUNC_NAME
"(@pxref{Delayed evaluation,,,r5rs.info,The Revised^5 Report on Scheme}).")
#define FUNC_NAME s_scm_promise_p
{
- return SCM_BOOL (SCM_TYP16_PREDICATE (scm_tc16_promise, obj));
+ return scm_from_bool (SCM_TYP16_PREDICATE (scm_tc16_promise, obj));
}
#undef FUNC_NAME
z = scm_cons (x, y);
/* Copy source properties possibly associated with xorig. */
p = scm_whash_lookup (scm_source_whash, xorig);
- if (!SCM_IMP (p))
+ if (scm_is_true (p))
scm_whash_insert (scm_source_whash, z, p);
return z;
}
#undef FUNC_NAME
+/* The function scm_copy_tree is used to copy an expression tree to allow the
+ * memoizer to modify the expression during memoization. scm_copy_tree
+ * creates deep copies of pairs and vectors, but not of any other data types,
+ * since only pairs and vectors will be parsed by the memoizer.
+ *
+ * To avoid infinite recursion due to cyclic structures, the hare-and-tortoise
+ * pattern is used to detect cycles. In fact, the pattern is used in two
+ * dimensions, vertical (indicated in the code by the variable names 'hare'
+ * and 'tortoise') and horizontal ('rabbit' and 'turtle'). In both
+ * dimensions, the hare/rabbit will take two steps when the tortoise/turtle
+ * takes one.
+ *
+ * The vertical dimension corresponds to recursive calls to function
+ * copy_tree: This happens when descending into vector elements, into cars of
+ * lists and into the cdr of an improper list. In this dimension, the
+ * tortoise follows the hare by using the processor stack: Every stack frame
+ * will hold an instance of struct t_trace. These instances are connected in
+ * a way that represents the trace of the hare, which thus can be followed by
+ * the tortoise. The tortoise will always point to struct t_trace instances
+ * relating to SCM objects that have already been copied. Thus, a cycle is
+ * detected if the tortoise and the hare point to the same object,
+ *
+ * The horizontal dimension is within one execution of copy_tree, when the
+ * function cdr's along the pairs of a list. This is the standard
+ * hare-and-tortoise implementation, found several times in guile. */
+
+struct t_trace {
+ struct t_trace *trace; /* These pointers form a trace along the stack. */
+ SCM obj; /* The object handled at the respective stack frame.*/
+};
+
+static SCM
+copy_tree (
+ struct t_trace *const hare,
+ struct t_trace *tortoise,
+ unsigned int tortoise_delay )
+{
+ if (!scm_is_pair (hare->obj) && !scm_is_simple_vector (hare->obj))
+ {
+ return hare->obj;
+ }
+ else
+ {
+ /* Prepare the trace along the stack. */
+ struct t_trace new_hare;
+ hare->trace = &new_hare;
+
+ /* The tortoise will make its step after the delay has elapsed. Note
+ * that in contrast to the typical hare-and-tortoise pattern, the step
+ * of the tortoise happens before the hare takes its steps. This is, in
+ * principle, no problem, except for the start of the algorithm: Then,
+ * it has to be made sure that the hare actually gets its advantage of
+ * two steps. */
+ if (tortoise_delay == 0)
+ {
+ tortoise_delay = 1;
+ tortoise = tortoise->trace;
+ ASSERT_SYNTAX (!scm_is_eq (hare->obj, tortoise->obj),
+ s_bad_expression, hare->obj);
+ }
+ else
+ {
+ --tortoise_delay;
+ }
+
+ if (scm_is_simple_vector (hare->obj))
+ {
+ size_t length = SCM_SIMPLE_VECTOR_LENGTH (hare->obj);
+ SCM new_vector = scm_c_make_vector (length, SCM_UNSPECIFIED);
+
+ /* Each vector element is copied by recursing into copy_tree, having
+ * the tortoise follow the hare into the depths of the stack. */
+ unsigned long int i;
+ for (i = 0; i < length; ++i)
+ {
+ SCM new_element;
+ new_hare.obj = SCM_SIMPLE_VECTOR_REF (hare->obj, i);
+ new_element = copy_tree (&new_hare, tortoise, tortoise_delay);
+ SCM_SIMPLE_VECTOR_SET (new_vector, i, new_element);
+ }
+
+ return new_vector;
+ }
+ else /* scm_is_pair (hare->obj) */
+ {
+ SCM result;
+ SCM tail;
+
+ SCM rabbit = hare->obj;
+ SCM turtle = hare->obj;
+
+ SCM copy;
+
+ /* The first pair of the list is treated specially, in order to
+ * preserve a potential source code position. */
+ result = tail = scm_cons_source (rabbit, SCM_EOL, SCM_EOL);
+ new_hare.obj = SCM_CAR (rabbit);
+ copy = copy_tree (&new_hare, tortoise, tortoise_delay);
+ SCM_SETCAR (tail, copy);
+
+ /* The remaining pairs of the list are copied by, horizontally,
+ * having the turtle follow the rabbit, and, vertically, having the
+ * tortoise follow the hare into the depths of the stack. */
+ rabbit = SCM_CDR (rabbit);
+ while (scm_is_pair (rabbit))
+ {
+ new_hare.obj = SCM_CAR (rabbit);
+ copy = copy_tree (&new_hare, tortoise, tortoise_delay);
+ SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED));
+ tail = SCM_CDR (tail);
+
+ rabbit = SCM_CDR (rabbit);
+ if (scm_is_pair (rabbit))
+ {
+ new_hare.obj = SCM_CAR (rabbit);
+ copy = copy_tree (&new_hare, tortoise, tortoise_delay);
+ SCM_SETCDR (tail, scm_cons (copy, SCM_UNDEFINED));
+ tail = SCM_CDR (tail);
+ rabbit = SCM_CDR (rabbit);
+
+ turtle = SCM_CDR (turtle);
+ ASSERT_SYNTAX (!scm_is_eq (rabbit, turtle),
+ s_bad_expression, rabbit);
+ }
+ }
+
+ /* We have to recurse into copy_tree again for the last cdr, in
+ * order to handle the situation that it holds a vector. */
+ new_hare.obj = rabbit;
+ copy = copy_tree (&new_hare, tortoise, tortoise_delay);
+ SCM_SETCDR (tail, copy);
+
+ return result;
+ }
+ }
+}
+
SCM_DEFINE (scm_copy_tree, "copy-tree", 1, 0, 0,
(SCM obj),
"Recursively copy the data tree that is bound to @var{obj}, and return a\n"
- "pointer to the new data structure. @code{copy-tree} recurses down the\n"
+ "the new data structure. @code{copy-tree} recurses down the\n"
"contents of both pairs and vectors (since both cons cells and vector\n"
"cells may point to arbitrary objects), and stops recursing when it hits\n"
"any other object.")
#define FUNC_NAME s_scm_copy_tree
{
- SCM ans, tl;
- if (SCM_IMP (obj))
- return obj;
- if (SCM_VECTORP (obj))
- {
- unsigned long i = SCM_VECTOR_LENGTH (obj);
- ans = scm_c_make_vector (i, SCM_UNSPECIFIED);
- while (i--)
- SCM_VECTOR_SET (ans, i, scm_copy_tree (SCM_VELTS (obj)[i]));
- return ans;
- }
- if (!SCM_CONSP (obj))
- return obj;
- ans = tl = scm_cons_source (obj,
- scm_copy_tree (SCM_CAR (obj)),
- SCM_UNSPECIFIED);
- for (obj = SCM_CDR (obj); SCM_CONSP (obj); obj = SCM_CDR (obj))
- {
- SCM_SETCDR (tl, scm_cons (scm_copy_tree (SCM_CAR (obj)),
- SCM_UNSPECIFIED));
- tl = SCM_CDR (tl);
- }
- SCM_SETCDR (tl, obj);
- return ans;
+ /* Prepare the trace along the stack. */
+ struct t_trace trace;
+ trace.obj = obj;
+
+ /* In function copy_tree, if the tortoise makes its step, it will do this
+ * before the hare has the chance to move. Thus, we have to make sure that
+ * the very first step of the tortoise will not happen after the hare has
+ * really made two steps. This is achieved by passing '2' as the initial
+ * delay for the tortoise. NOTE: Since cycles are unlikely, giving the hare
+ * a bigger advantage may improve performance slightly. */
+ return copy_tree (&trace, &trace, 2);
}
#undef FUNC_NAME
environment and calling scm_i_eval. Thus, changes to the
top-level module are tracked normally.
- - scm_eval (exp, mod)
+ - scm_eval (exp, mod_or_state)
- evaluates EXP while MOD is the current module. This is done by
- setting the current module to MOD, invoking scm_primitive_eval on
- EXP, and then restoring the current module to the value it had
- previously. That is, while EXP is evaluated, changes to the
- current module are tracked, but these changes do not persist when
+ evaluates EXP while MOD_OR_STATE is the current module or current
+ dynamic state (as appropriate). This is done by setting the
+ current module (or dynamic state) to MOD_OR_STATE, invoking
+ scm_primitive_eval on EXP, and then restoring the current module
+ (or dynamic state) to the value it had previously. That is,
+ while EXP is evaluated, changes to the current module (or dynamic
+ state) are tracked, but these changes do not persist when
scm_eval returns.
For each level of evals, there are two variants, distinguished by a
SCM
scm_i_eval_x (SCM exp, SCM env)
{
- return SCM_XEVAL (exp, env);
+ if (scm_is_symbol (exp))
+ return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1);
+ else
+ return SCM_I_XEVAL (exp, env);
}
SCM
scm_i_eval (SCM exp, SCM env)
{
exp = scm_copy_tree (exp);
- return SCM_XEVAL (exp, env);
+ if (scm_is_symbol (exp))
+ return *scm_lookupcar (scm_cons (exp, SCM_UNDEFINED), env, 1);
+ else
+ return SCM_I_XEVAL (exp, env);
}
SCM
{
SCM env;
SCM transformer = scm_current_module_transformer ();
- if (SCM_NIMP (transformer))
+ if (scm_is_true (transformer))
exp = scm_call_1 (transformer, exp);
env = scm_top_level_env (scm_current_module_lookup_closure ());
return scm_i_eval (exp, env);
}
#undef FUNC_NAME
+
/* Eval does not take the second arg optionally. This is intentional
* in order to be R5RS compatible, and to prepare for the new module
* system, where we would like to make the choice of evaluation
* environment explicit. */
-static void
-change_environment (void *data)
-{
- SCM pair = SCM_PACK (data);
- SCM new_module = SCM_CAR (pair);
- SCM old_module = scm_current_module ();
- SCM_SETCDR (pair, old_module);
- scm_set_current_module (new_module);
-}
-
-
-static void
-restore_environment (void *data)
-{
- SCM pair = SCM_PACK (data);
- SCM old_module = SCM_CDR (pair);
- SCM new_module = scm_current_module ();
- SCM_SETCAR (pair, new_module);
- scm_set_current_module (old_module);
-}
-
-static SCM
-inner_eval_x (void *data)
-{
- return scm_primitive_eval_x (SCM_PACK(data));
-}
-
SCM
-scm_eval_x (SCM exp, SCM module)
-#define FUNC_NAME "eval!"
+scm_eval_x (SCM exp, SCM module_or_state)
{
- SCM_VALIDATE_MODULE (2, module);
+ SCM res;
- return scm_internal_dynamic_wind
- (change_environment, inner_eval_x, restore_environment,
- (void *) SCM_UNPACK (exp),
- (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F)));
-}
-#undef FUNC_NAME
+ scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
+ if (scm_is_dynamic_state (module_or_state))
+ scm_dynwind_current_dynamic_state (module_or_state);
+ else
+ scm_dynwind_current_module (module_or_state);
-static SCM
-inner_eval (void *data)
-{
- return scm_primitive_eval (SCM_PACK(data));
+ res = scm_primitive_eval_x (exp);
+
+ scm_dynwind_end ();
+ return res;
}
SCM_DEFINE (scm_eval, "eval", 2, 0, 0,
- (SCM exp, SCM module),
+ (SCM exp, SCM module_or_state),
"Evaluate @var{exp}, a list representing a Scheme expression,\n"
- "in the top-level environment specified by @var{module}.\n"
+ "in the top-level environment specified by\n"
+ "@var{module_or_state}.\n"
"While @var{exp} is evaluated (using @code{primitive-eval}),\n"
- "@var{module} is made the current module. The current module\n"
- "is reset to its previous value when @var{eval} returns.")
+ "@var{module_or_state} is made the current module when\n"
+ "it is a module, or the current dynamic state when it is\n"
+ "a dynamic state."
+ "Example: (eval '(+ 1 2) (interaction-environment))")
#define FUNC_NAME s_scm_eval
{
- SCM_VALIDATE_MODULE (2, module);
+ SCM res;
+
+ scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
+ if (scm_is_dynamic_state (module_or_state))
+ scm_dynwind_current_dynamic_state (module_or_state);
+ else
+ scm_dynwind_current_module (module_or_state);
+
+ res = scm_primitive_eval (exp);
- return scm_internal_dynamic_wind
- (change_environment, inner_eval, restore_environment,
- (void *) SCM_UNPACK (exp),
- (void *) SCM_UNPACK (scm_cons (module, SCM_BOOL_F)));
+ scm_dynwind_end ();
+ return res;
}
#undef FUNC_NAME
-/* At this point, scm_deval and scm_dapply are generated.
+/* At this point, deval and scm_dapply are generated.
*/
#define DEVAL
#include "eval.c"
+#if (SCM_ENABLE_DEPRECATED == 1)
+
+/* Deprecated in guile 1.7.0 on 2004-03-29. */
+SCM scm_ceval (SCM x, SCM env)
+{
+ if (scm_is_pair (x))
+ return ceval (x, env);
+ else if (scm_is_symbol (x))
+ return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1);
+ else
+ return SCM_I_XEVAL (x, env);
+}
+
+/* Deprecated in guile 1.7.0 on 2004-03-29. */
+SCM scm_deval (SCM x, SCM env)
+{
+ if (scm_is_pair (x))
+ return deval (x, env);
+ else if (scm_is_symbol (x))
+ return *scm_lookupcar (scm_cons (x, SCM_UNDEFINED), env, 1);
+ else
+ return SCM_I_XEVAL (x, env);
+}
+
+static SCM
+dispatching_eval (SCM x, SCM env)
+{
+ if (scm_debug_mode_p)
+ return scm_deval (x, env);
+ else
+ return scm_ceval (x, env);
+}
+
+/* Deprecated in guile 1.7.0 on 2004-03-29. */
+SCM (*scm_ceval_ptr) (SCM x, SCM env) = dispatching_eval;
+
+#endif
+
+
void
scm_init_eval ()
{
+ scm_i_pthread_mutex_init (&source_mutex,
+ scm_i_pthread_mutexattr_recursive);
+
scm_init_opts (scm_evaluator_traps,
scm_evaluator_trap_table,
SCM_N_EVALUATOR_TRAPS);
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_mark (scm_tc16_promise, promise_mark);
scm_set_smob_free (scm_tc16_promise, promise_free);
scm_set_smob_print (scm_tc16_promise, promise_print);
scm_permanent_object (f_apply);
#include "libguile/eval.x"
-
+
scm_add_feature ("delay");
}
HCoop / bpt / guile.git / blobdiff