-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1999,2000,2001, 2003 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
+
+
\f
/* This file and objects.h contains those minimal pieces of the Guile
* libguile. See the comments in objects.h.
*/
-#include "_scm.h"
+#include "libguile/_scm.h"
-#include "struct.h"
-#include "procprop.h"
-#include "chars.h"
-#include "kw.h"
+#include "libguile/struct.h"
+#include "libguile/procprop.h"
+#include "libguile/chars.h"
+#include "libguile/keywords.h"
+#include "libguile/smob.h"
+#include "libguile/eval.h"
+#include "libguile/alist.h"
+#include "libguile/ports.h"
+#include "libguile/strings.h"
+#include "libguile/vectors.h"
-#include "objects.h"
+#include "libguile/validate.h"
+#include "libguile/objects.h"
\f
SCM scm_metaclass_standard;
/* These variables are filled in by the object system when loaded. */
SCM scm_class_boolean, scm_class_char, scm_class_pair;
SCM scm_class_procedure, scm_class_string, scm_class_symbol;
-SCM scm_class_procedure_with_setter;
+SCM scm_class_procedure_with_setter, scm_class_primitive_generic;
SCM scm_class_vector, scm_class_null;
-SCM scm_class_real, scm_class_complex, scm_class_integer;
-SCM scm_class_keyword, scm_class_unknown;
+SCM scm_class_integer, scm_class_real, scm_class_complex;
+SCM scm_class_unknown;
-void (*scm_change_object_class) (SCM, SCM, SCM);
+SCM *scm_port_class = 0;
+SCM *scm_smob_class = 0;
+
+SCM scm_no_applicable_method;
/* This function is used for efficient type dispatch. */
-SCM
-scm_class_of (SCM x)
+SCM_DEFINE (scm_class_of, "class-of", 1, 0, 0,
+ (SCM x),
+ "Return the class of @var{x}.")
+#define FUNC_NAME s_scm_class_of
{
switch (SCM_ITAG3 (x))
{
return scm_class_integer;
case scm_tc3_imm24:
- if (SCM_ICHRP (x))
+ if (SCM_CHARP (x))
return scm_class_char;
else
{
return scm_class_pair;
case scm_tcs_closures:
return scm_class_procedure;
- case scm_tcs_symbols:
+ case scm_tc7_symbol:
return scm_class_symbol;
case scm_tc7_vector:
case scm_tc7_wvect:
+#ifdef SCM_HAVE_ARRAYS
case scm_tc7_bvect:
case scm_tc7_byvect:
case scm_tc7_svect:
case scm_tc7_fvect:
case scm_tc7_dvect:
case scm_tc7_cvect:
+#endif
return scm_class_vector;
case scm_tc7_string:
- case scm_tc7_substring:
return scm_class_string;
case scm_tc7_asubr:
case scm_tc7_subr_0:
case scm_tc7_subr_2o:
case scm_tc7_lsubr_2:
case scm_tc7_lsubr:
+ if (SCM_SUBR_GENERIC (x) && *SCM_SUBR_GENERIC (x))
+ return scm_class_primitive_generic;
+ else
+ return scm_class_procedure;
+ case scm_tc7_cclo:
return scm_class_procedure;
case scm_tc7_pws:
return scm_class_procedure_with_setter;
- case scm_tc7_port:
- return scm_class_unknown;
case scm_tc7_smob:
{
- SCM type = SCM_TYP16 (x);
- if (type == scm_tc16_flo)
- {
- if (SCM_CAR (x) & SCM_IMAG_PART)
- return scm_class_complex;
- else
- return scm_class_real;
- }
- else if (type == scm_tc16_bigpos || type == scm_tc16_bigneg)
- return scm_class_integer;
- else if (type == scm_tc16_kw)
- return scm_class_keyword;
- else
- return scm_class_unknown;
+ scm_t_bits type = SCM_TYP16 (x);
+ if (type != scm_tc16_port_with_ps)
+ return scm_smob_class[SCM_TC2SMOBNUM (type)];
+ x = SCM_PORT_WITH_PS_PORT (x);
+ /* fall through to ports */
}
- case scm_tcs_cons_gloc:
- /* must be a struct */
- if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
- {
- if (SCM_OBJ_CLASS_REDEF (x) != SCM_BOOL_F)
- scm_change_object_class (x,
- SCM_CLASS_OF (x), /* old */
- SCM_OBJ_CLASS_REDEF (x)); /* new */
+ case scm_tc7_port:
+ return scm_port_class[(SCM_WRTNG & SCM_CELL_WORD_0 (x)
+ ? (SCM_RDNG & SCM_CELL_WORD_0 (x)
+ ? SCM_INOUT_PCLASS_INDEX | SCM_PTOBNUM (x)
+ : SCM_OUT_PCLASS_INDEX | SCM_PTOBNUM (x))
+ : SCM_IN_PCLASS_INDEX | SCM_PTOBNUM (x))];
+ case scm_tcs_struct:
+ if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS_VALID)
return SCM_CLASS_OF (x);
- }
+ else if (SCM_OBJ_CLASS_FLAGS (x) & SCM_CLASSF_GOOPS)
+ {
+ /* Goops object */
+ if (! SCM_FALSEP (SCM_OBJ_CLASS_REDEF (x)))
+ scm_change_object_class (x,
+ SCM_CLASS_OF (x), /* old */
+ SCM_OBJ_CLASS_REDEF (x)); /* new */
+ return SCM_CLASS_OF (x);
+ }
+ else
+ {
+ /* ordinary struct */
+ SCM handle = scm_struct_create_handle (SCM_STRUCT_VTABLE (x));
+ if (!SCM_FALSEP (SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle))))
+ return SCM_STRUCT_TABLE_CLASS (SCM_CDR (handle));
+ else
+ {
+ SCM name = SCM_STRUCT_TABLE_NAME (SCM_CDR (handle));
+ SCM class = scm_make_extended_class (!SCM_FALSEP (name)
+ ? SCM_SYMBOL_CHARS (name)
+ : 0,
+ SCM_I_OPERATORP (x));
+ SCM_SET_STRUCT_TABLE_CLASS (SCM_CDR (handle), class);
+ return class;
+ }
+ }
default:
if (SCM_CONSP (x))
return scm_class_pair;
return scm_class_unknown;
}
- case scm_tc3_cons_gloc:
+ case scm_tc3_struct:
case scm_tc3_tc7_1:
case scm_tc3_tc7_2:
case scm_tc3_closure:
}
return scm_class_unknown;
}
+#undef FUNC_NAME
+
+/* The cache argument for scm_mcache_lookup_cmethod has one of two possible
+ * formats:
+ *
+ * Format #1:
+ * (SCM_IM_DISPATCH ARGS N-SPECIALIZED
+ * #((TYPE1 ... ENV FORMALS FORM ...) ...)
+ * GF)
+ *
+ * Format #2:
+ * (SCM_IM_HASH_DISPATCH ARGS N-SPECIALIZED HASHSET MASK
+ * #((TYPE1 ... ENV FORMALS FORM ...) ...)
+ * GF)
+ *
+ * ARGS is either a list of expressions, in which case they
+ * are interpreted as the arguments of an application, or
+ * a non-pair, which is interpreted as a single expression
+ * yielding all arguments.
+ *
+ * SCM_IM_DISPATCH expressions in generic functions always
+ * have ARGS = the symbol `args' or the iloc #@0-0.
+ *
+ * Need FORMALS in order to support varying arity. This
+ * also avoids the need for renaming of bindings.
+ *
+ * We should probably not complicate this mechanism by
+ * introducing "optimizations" for getters and setters or
+ * primitive methods. Getters and setter will normally be
+ * compiled into @slot-[ref|set!] or a procedure call.
+ * They rely on the dispatch performed before executing
+ * the code which contains them.
+ *
+ * We might want to use a more efficient representation of
+ * this form in the future, perhaps after we have introduced
+ * low-level support for syntax-case macros.
+ */
+
+SCM
+scm_mcache_lookup_cmethod (SCM cache, SCM args)
+{
+ long i, n, end, mask;
+ SCM ls, methods, z = SCM_CDDR (cache);
+ n = SCM_INUM (SCM_CAR (z)); /* maximum number of specializers */
+ methods = SCM_CADR (z);
+
+ if (SCM_INUMP (methods))
+ {
+ /* cache format #2: compute a hash value */
+ long hashset = SCM_INUM (methods);
+ long j = n;
+ z = SCM_CDDR (z);
+ mask = SCM_INUM (SCM_CAR (z));
+ methods = SCM_CADR (z);
+ i = 0;
+ ls = args;
+ if (!SCM_NULLP (ls))
+ do
+ {
+ i += SCM_STRUCT_DATA (scm_class_of (SCM_CAR (ls)))
+ [scm_si_hashsets + hashset];
+ ls = SCM_CDR (ls);
+ }
+ while (j-- && !SCM_NULLP (ls));
+ i &= mask;
+ end = i;
+ }
+ else /* SCM_VECTORP (methods) */
+ {
+ /* cache format #1: prepare for linear search */
+ mask = -1;
+ i = 0;
+ end = SCM_VECTOR_LENGTH (methods);
+ }
+
+ /* Search for match */
+ do
+ {
+ long j = n;
+ z = SCM_VELTS (methods)[i];
+ ls = args; /* list of arguments */
+ if (!SCM_NULLP (ls))
+ do
+ {
+ /* More arguments than specifiers => CLASS != ENV */
+ if (! SCM_EQ_P (scm_class_of (SCM_CAR (ls)), SCM_CAR (z)))
+ goto next_method;
+ ls = SCM_CDR (ls);
+ z = SCM_CDR (z);
+ }
+ while (j-- && !SCM_NULLP (ls));
+ /* Fewer arguments than specifiers => CAR != ENV */
+ if (SCM_NULLP (SCM_CAR (z)) || SCM_CONSP (SCM_CAR (z)))
+ return z;
+ next_method:
+ i = (i + 1) & mask;
+ } while (i != end);
+ return SCM_BOOL_F;
+}
-SCM_PROC (s_entity_p, "entity?", 1, 0, 0, scm_entity_p);
+SCM
+scm_mcache_compute_cmethod (SCM cache, SCM args)
+{
+ SCM cmethod = scm_mcache_lookup_cmethod (cache, args);
+ if (SCM_FALSEP (cmethod))
+ /* No match - memoize */
+ return scm_memoize_method (cache, args);
+ return cmethod;
+}
+
+SCM
+scm_apply_generic (SCM gf, SCM args)
+{
+ SCM cmethod = scm_mcache_compute_cmethod (SCM_ENTITY_PROCEDURE (gf), args);
+ return scm_eval_body (SCM_CDR (SCM_CMETHOD_CODE (cmethod)),
+ SCM_EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (cmethod)),
+ args,
+ SCM_CMETHOD_ENV (cmethod)));
+}
SCM
-scm_entity_p (SCM obj)
+scm_call_generic_0 (SCM gf)
{
- return (SCM_NIMP (obj) && SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj)
- ? SCM_BOOL_T
- : SCM_BOOL_F);
+ return scm_apply_generic (gf, SCM_EOL);
}
-SCM_PROC (s_set_object_procedure_x, "set-object-procedure!", 1, 0, 1, scm_set_object_procedure_x);
+SCM
+scm_call_generic_1 (SCM gf, SCM a1)
+{
+ return scm_apply_generic (gf, scm_list_1 (a1));
+}
+
+SCM
+scm_call_generic_2 (SCM gf, SCM a1, SCM a2)
+{
+ return scm_apply_generic (gf, scm_list_2 (a1, a2));
+}
SCM
-scm_set_object_procedure_x (SCM obj, SCM procs)
+scm_call_generic_3 (SCM gf, SCM a1, SCM a2, SCM a3)
+{
+ return scm_apply_generic (gf, scm_list_3 (a1, a2, a3));
+}
+
+SCM_DEFINE (scm_entity_p, "entity?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is an entity.")
+#define FUNC_NAME s_scm_entity_p
+{
+ return SCM_BOOL(SCM_STRUCTP (obj) && SCM_I_ENTITYP (obj));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_operator_p, "operator?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is an operator.")
+#define FUNC_NAME s_scm_operator_p
+{
+ return SCM_BOOL(SCM_STRUCTP (obj)
+ && SCM_I_OPERATORP (obj)
+ && !SCM_I_ENTITYP (obj));
+}
+#undef FUNC_NAME
+
+/* XXX - What code requires the object procedure to be only of certain
+ types? */
+
+SCM_DEFINE (scm_valid_object_procedure_p, "valid-object-procedure?", 1, 0, 0,
+ (SCM proc),
+ "Return @code{#t} iff @var{proc} is a procedure that can be used "
+ "with @code{set-object-procedure}. It is always valid to use "
+ "a closure constructed by @code{lambda}.")
+#define FUNC_NAME s_scm_valid_object_procedure_p
+{
+ if (SCM_IMP (proc))
+ return SCM_BOOL_F;
+ switch (SCM_TYP7 (proc))
+ {
+ default:
+ return SCM_BOOL_F;
+ case scm_tcs_closures:
+ case scm_tc7_subr_1:
+ case scm_tc7_subr_2:
+ case scm_tc7_subr_3:
+ case scm_tc7_lsubr_2:
+ return SCM_BOOL_T;
+ }
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_set_object_procedure_x, "set-object-procedure!", 2, 0, 0,
+ (SCM obj, SCM proc),
+ "Set the object procedure of @var{obj} to @var{proc}.\n"
+ "@var{obj} must be either an entity or an operator.")
+#define FUNC_NAME s_scm_set_object_procedure_x
{
- SCM proc[4], *pp, p, setp, arity;
- int i, a, r;
- SCM_ASSERT (SCM_NIMP (obj) && SCM_STRUCTP (obj)
+ SCM_ASSERT (SCM_STRUCTP (obj)
&& ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
- || SCM_I_ENTITYP (obj)),
+ || (SCM_I_ENTITYP (obj)
+ && !(SCM_OBJ_CLASS_FLAGS (obj)
+ & SCM_CLASSF_PURE_GENERIC))),
obj,
SCM_ARG1,
- s_set_object_procedure_x);
- for (i = 0; i < 4; ++i)
- proc[i] = SCM_BOOL_F;
- i = 0;
- while (SCM_NIMP (procs))
- {
- if (i == 4)
- scm_wrong_num_args (scm_makfrom0str (s_set_object_procedure_x));
- p = SCM_CAR (procs);
- setp = 0;
- SCM_ASSERT (SCM_NIMP (p), p, SCM_ARG2 + i, s_set_object_procedure_x);
- if (SCM_CLOSUREP (p))
- {
- arity = scm_procedure_property (p, scm_sym_arity);
- a = SCM_INUM (SCM_CAR (arity));
- /* Closures have zero optional args */
- r = SCM_NFALSEP (SCM_CADDR (arity));
- if (a == 1 || (a <= 1 && r))
- {
- if (SCM_NFALSEP (proc[0]))
- goto ambiguous;
- proc[0] = setp = p;
- }
- if (a == 2 || (a <= 2 && r))
- {
- if (SCM_NFALSEP (proc[1]))
- goto ambiguous;
- proc[1] = setp = p;
- }
- if (a == 3 || (a <= 3 && r))
- {
- if (SCM_NFALSEP (proc[2]))
- goto ambiguous;
- proc[2] = setp = p;
- }
- if (a <= 4 && r)
- {
- if (SCM_NFALSEP (proc[3]))
- goto ambiguous;
- proc[3] = setp = p;
- }
- }
- else if (SCM_TYP7 (p) == scm_tc7_subr_1)
- {
- if (SCM_NFALSEP (proc[0]))
- goto ambiguous;
- proc[0] = setp = p;
- }
- else if (SCM_TYP7 (p) == scm_tc7_subr_2)
- {
- if (SCM_NFALSEP (proc[1]))
- goto ambiguous;
- proc[1] = setp = p;
- }
- else if (SCM_TYP7 (p) == scm_tc7_subr_3)
- {
- if (SCM_NFALSEP (proc[2]))
- goto ambiguous;
- proc[2] = setp = p;
- }
- else if (SCM_TYP7 (p) == scm_tc7_lsubr_2)
- {
- if (SCM_NFALSEP (proc[3]))
- {
- ambiguous:
- SCM_ASSERT (0, p, "Ambiguous procedure arities",
- s_set_object_procedure_x);
- }
- proc[3] = setp = p;
- }
- SCM_ASSERT (setp, p, SCM_ARG2 + i, s_set_object_procedure_x);
- ++i;
- procs = SCM_CDR (procs);
- }
- pp = (SCM_I_ENTITYP (obj)
- ? &SCM_ENTITY_PROC_0 (obj)
- : &SCM_OPERATOR_CLASS (obj)->proc0);
- for (i = 0; i < 4; ++i)
- *pp++ = proc[i];
+ FUNC_NAME);
+ SCM_ASSERT (scm_valid_object_procedure_p (proc), proc, SCM_ARG2, FUNC_NAME);
+ if (SCM_I_ENTITYP (obj))
+ SCM_SET_ENTITY_PROCEDURE (obj, proc);
+ else
+ SCM_OPERATOR_CLASS (obj)->procedure = proc;
return SCM_UNSPECIFIED;
}
+#undef FUNC_NAME
+
+#ifdef GUILE_DEBUG
+SCM_DEFINE (scm_object_procedure, "object-procedure", 1, 0, 0,
+ (SCM obj),
+ "Return the object procedure of @var{obj}. @var{obj} must be\n"
+ "an entity or an operator.")
+#define FUNC_NAME s_scm_object_procedure
+{
+ SCM_ASSERT (SCM_STRUCTP (obj)
+ && ((SCM_CLASS_FLAGS (obj) & SCM_CLASSF_OPERATOR)
+ || SCM_I_ENTITYP (obj)),
+ obj, SCM_ARG1, FUNC_NAME);
+ return (SCM_I_ENTITYP (obj)
+ ? SCM_ENTITY_PROCEDURE (obj)
+ : SCM_OPERATOR_CLASS (obj)->procedure);
+}
+#undef FUNC_NAME
+#endif /* GUILE_DEBUG */
+
+/* The following procedures are not a part of Goops but a minimal
+ * object system built upon structs. They are here for those who
+ * want to implement their own object system.
+ */
SCM
scm_i_make_class_object (SCM meta,
SCM layout = scm_make_struct_layout (layout_string);
c = scm_make_struct (meta,
SCM_INUM0,
- SCM_LIST4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
+ scm_list_4 (layout, SCM_BOOL_F, SCM_EOL, SCM_EOL));
SCM_SET_CLASS_FLAGS (c, flags);
return c;
}
-SCM_PROC (s_make_class_object, "make-class-object", 2, 0, 0, scm_make_class_object);
-
-SCM
-scm_make_class_object (SCM metaclass, SCM layout)
+SCM_DEFINE (scm_make_class_object, "make-class-object", 2, 0, 0,
+ (SCM metaclass, SCM layout),
+ "Create a new class object of class @var{metaclass}, with the\n"
+ "slot layout specified by @var{layout}.")
+#define FUNC_NAME s_scm_make_class_object
{
unsigned long flags = 0;
- SCM_ASSERT (SCM_NIMP (metaclass) && SCM_STRUCTP (metaclass),
- metaclass, SCM_ARG1, s_make_class_object);
- SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout),
- layout, SCM_ARG2, s_make_class_object);
- if (metaclass == scm_metaclass_operator)
+ SCM_VALIDATE_STRUCT (1, metaclass);
+ SCM_VALIDATE_STRING (2, layout);
+ if (SCM_EQ_P (metaclass, scm_metaclass_operator))
flags = SCM_CLASSF_OPERATOR;
return scm_i_make_class_object (metaclass, layout, flags);
}
+#undef FUNC_NAME
-SCM_PROC (s_make_subclass_object, "make-subclass-object", 2, 0, 0, scm_make_subclass_object);
-
-SCM
-scm_make_subclass_object (SCM class, SCM layout)
+SCM_DEFINE (scm_make_subclass_object, "make-subclass-object", 2, 0, 0,
+ (SCM class, SCM layout),
+ "Create a subclass object of @var{class}, with the slot layout\n"
+ "specified by @var{layout}.")
+#define FUNC_NAME s_scm_make_subclass_object
{
SCM pl;
- SCM_ASSERT (SCM_NIMP (class) && SCM_STRUCTP (class),
- class,
- SCM_ARG1,
- s_make_subclass_object);
- SCM_ASSERT (SCM_NIMP (layout) && SCM_STRINGP (layout),
- layout,
- SCM_ARG2,
- s_make_subclass_object);
- pl = SCM_STRUCT_DATA (class)[scm_vtable_index_layout];
+ SCM_VALIDATE_STRUCT (1, class);
+ SCM_VALIDATE_STRING (2, layout);
+ pl = SCM_PACK (SCM_STRUCT_DATA (class) [scm_vtable_index_layout]);
/* Convert symbol->string */
- pl = scm_makfromstr (SCM_CHARS (pl), (scm_sizet) SCM_LENGTH (pl), 0);
+ pl = scm_mem2string (SCM_SYMBOL_CHARS (pl), SCM_SYMBOL_LENGTH (pl));
return scm_i_make_class_object (SCM_STRUCT_VTABLE (class),
- scm_string_append (SCM_LIST2 (pl, layout)),
+ scm_string_append (scm_list_2 (pl, layout)),
SCM_CLASS_FLAGS (class));
}
+#undef FUNC_NAME
void
scm_init_objects ()
{
SCM ms = scm_makfrom0str (SCM_METACLASS_STANDARD_LAYOUT);
- SCM ml = scm_make_struct_layout (ms);
- SCM mt = scm_make_vtable_vtable (ml, SCM_INUM0,
- SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
+ SCM mt = scm_make_vtable_vtable (ms, SCM_INUM0,
+ scm_list_3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
SCM os = scm_makfrom0str (SCM_METACLASS_OPERATOR_LAYOUT);
- SCM ol = scm_make_struct_layout (os);
- SCM ot = scm_make_vtable_vtable (ol, SCM_INUM0,
- SCM_LIST3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
+ SCM ot = scm_make_vtable_vtable (os, SCM_INUM0,
+ scm_list_3 (SCM_BOOL_F, SCM_EOL, SCM_EOL));
SCM es = scm_makfrom0str (SCM_ENTITY_LAYOUT);
SCM el = scm_make_struct_layout (es);
SCM et = scm_make_struct (mt, SCM_INUM0,
- SCM_LIST4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
+ scm_list_4 (el, SCM_BOOL_F, SCM_EOL, SCM_EOL));
- scm_sysintern ("<class>", mt);
+ scm_c_define ("<class>", mt);
scm_metaclass_standard = mt;
- scm_sysintern ("<operator-class>", ot);
+ scm_c_define ("<operator-class>", ot);
scm_metaclass_operator = ot;
SCM_SET_CLASS_FLAGS (et, SCM_CLASSF_OPERATOR | SCM_CLASSF_ENTITY);
- scm_sysintern ("<entity>", et);
+ SCM_SET_CLASS_DESTRUCTOR (et, scm_struct_free_entity);
+ scm_c_define ("<entity>", et);
-#include "objects.x"
+#include "libguile/objects.x"
}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff