/* classes: h_files */
-#ifndef TAGSH
-#define TAGSH
-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
- *
+#ifndef SCM_TAGS_H
+#define SCM_TAGS_H
+/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
- *
+ *
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
+ *
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* 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.
- */
+ * If you do not wish that, delete this exception notice. */
+
+/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
+ gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
+
\f
-/** This file defines the format of SCM values and cons pairs.
+/** This file defines the format of SCM values and cons pairs.
** It is here that tag bits are assigned for various purposes.
**/
/* In the beginning was the Word:
*/
-typedef long SCM;
+typedef long scm_bits_t;
+/* But as external interface, we use SCM, which may, according to the desired
+ * level of type checking, be defined in several ways:
+ */
+#if (SCM_DEBUG_TYPING_STRICTNESS == 2)
+ typedef union { struct { scm_bits_t n; } n; } SCM;
+ static SCM scm_pack(scm_bits_t b) { SCM s; s.n.n = b; return s; }
+# define SCM_UNPACK(x) ((x).n.n)
+# define SCM_PACK(x) (scm_pack ((scm_bits_t) (x)))
+#elif (SCM_DEBUG_TYPING_STRICTNESS == 1)
+/* This is the default, which provides an intermediate level of compile time
+ * type checking while still resulting in very efficient code.
+ */
+ typedef struct scm_unused_struct * SCM;
+# define SCM_UNPACK(x) ((scm_bits_t) (x))
+# define SCM_PACK(x) ((SCM) (x))
+#else
+/* This should be used as a fall back solution for machines on which casting
+ * to a pointer may lead to loss of bit information, e. g. in the three least
+ * significant bits.
+ */
+ typedef scm_bits_t SCM;
+# define SCM_UNPACK(x) (x)
+# define SCM_PACK(x) ((scm_bits_t) (x))
+#endif
-/* Cray machines have pointers that are incremented once for each word,
- * rather than each byte, the 3 most significant bits encode the byte
- * within the word. The following macros deal with this by storing the
- * native Cray pointers like the ones that looks like scm expects. This
- * is done for any pointers that might appear in the car of a scm_cell, pointers
- * to scm_vector elts, functions, &c are not munged.
+/* SCM values can not be compared by using the operator ==. Use the following
+ * macro instead, which is the equivalent of the scheme predicate 'eq?'.
*/
-#ifdef _UNICOS
-# define SCM2PTR(x) ((int)(x) >> 3)
-# define PTR2SCM(x) (((SCM)(x)) << 3)
-# define SCM_POINTERS_MUNGED
-#else
-# define SCM2PTR(x) (x)
-# define PTR2SCM(x) ((SCM)(x))
-#endif /* def _UNICOS */
+#define SCM_EQ_P(x, y) (SCM_UNPACK (x) == SCM_UNPACK (y))
\f
+
/* SCM variables can contain:
*
* Non-objects -- meaning that the tag-related macros don't apply to them
*
* Immediates -- meaning that the variable contains an entire Scheme object.
*
- * Non-immediates -- meaning that the variable holds a (possibly tagged) pointer
- * into the cons pair heap.
+ * Non-immediates -- meaning that the variable holds a (possibly
+ * tagged) pointer into the cons pair heap.
*
- * Non-objects are distinguished from other values by careful coding only (i.e.,
- * programmers must keep track of any SCM variables they create that don't contain
- * ordinary scheme values).
+ * Non-objects are distinguished from other values by careful coding
+ * only (i.e., programmers must keep track of any SCM variables they
+ * create that don't contain ordinary scheme values).
*
- * All immediates and non-immediates must have a 0 in bit 0. Only non-object
- * values can have a 1 in bit 0. In some cases, bit 0 of a word in the heap
- * is used for the GC tag so during garbage collection, that bit might be 1
- * even in an immediate or non-immediate value. In other cases, bit 0 of a word
- * in the heap is used to tag a pointer to a GLOC (VM global variable address)
- * or the header of a struct. But whenever an SCM variable holds a normal Scheme
- * value, bit 0 is 0.
+ * All immediates and non-immediates must have a 0 in bit 0. Only
+ * non-object values can have a 1 in bit 0. In some cases, bit 0 of a
+ * word in the heap is used for the GC tag so during garbage
+ * collection, that bit might be 1 even in an immediate or
+ * non-immediate value. In other cases, bit 0 of a word in the heap
+ * is used to tag a pointer to a GLOC (VM global variable address) or
+ * the header of a struct. But whenever an SCM variable holds a
+ * normal Scheme value, bit 0 is 0.
*
* Immediates and non-immediates are distinguished by bits two and four.
* Immediate values must have a 1 in at least one of those bits. Does
- * this (or any other detail of tagging) seem arbitrary? Try chaning it!
+ * this (or any other detail of tagging) seem arbitrary? Try changing it!
* (Not always impossible but it is fair to say that many details of tags
- * are mutually dependent).
- */
+ * are mutually dependent). */
-#define SCM_IMP(x) (6 & (int)(x))
-#define SCM_NIMP(x) (!SCM_IMP(x))
+#define SCM_IMP(x) (6 & SCM_UNPACK (x))
+#define SCM_NIMP(x) (!SCM_IMP (x))
/* Here is a summary of tagging in SCM values as they might occur in
- * SCM variables or in the heap.
+ * SCM variables or in the heap.
*
* low bits meaning
*
- *
+ *
* 0 Most objects except...
* 1 ...glocs and structs (this tag valid only in a SCM_CAR or
* in the header of a struct's data).
* 100 --- IMMEDIATES
*
* Looking at the seven final bits of an immediate:
- *
+ *
* 0000-100 short instruction
* 0001-100 short instruction
* 0010-100 short instruction
* 1110-100 immediate characters
* 1111-100 ilocs
*
- * Some of the 0110100 immediates are long instructions (they dispatch
+ * Some of the 0110100 immediates are long instructions (they dispatch
* in two steps compared to one step for a short instruction).
* The two steps are, (1) dispatch on 7 bits to the long instruction
* handler, (2) dispatch on 7 additional bits.
* gloc ..........SCM vcell..........001 ...........SCM cdr.............G
* struct ..........void * type........001 ...........void * data.........G
* closure ..........SCM code...........011 ...........SCM env.............G
- * tc7 .........long length....GxxxD1S1 ..........void *data............
+ * tc7 ......24.bits of data...Gxxxx1S1 ..........void *data............
*
*
*
* 101 & 111 --- tc7_ types
*
- * tc7_tags are 7 bit tags ending in 1x1. These tags occur
- * only in the CAR of heap cells.
+ * tc7_tags are 7 bit tags ending in 1x1. These tags
+ * occur only in the CAR of heap cells, and have the
+ * handy property that all bits of the CAR above the
+ * bottom eight can be used to store some data, thus
+ * saving a word in the body itself. Thus, we use them
+ * for strings and vectors (among other things).
*
- * SCM_LENGTH returns the bits in "length" (see the diagram).
- * SCM_CHARS returns the data cast to "char *"
- * SCM_CDR returns the data cast to "SCM"
- * TYP7(X) returns bits 0...6 of SCM_CAR (X)
+ * TYP7(X) returns bits 0...6 of CELL_TYPE (X)
*
- * For the interpretation of SCM_LENGTH and SCM_CHARS
- * that applies to a particular type, see the header file
- * for that type.
+ * Sometimes we choose the bottom seven bits carefully,
+ * so that the 2-valued bit (called S bit) can be masked
+ * off to reveal a common type.
*
* TYP7S(X) returns TYP7, but masking out the option bit S.
- * TYP7D(X) returns TYP7, but masking out the option bit D.
- * TYP7SD(X) masks out both option bits.
- *
- * for example:
- * D S
- * scm_tc7_string = Gxxx0101
- * scm_tc7_mb_string = Gxxx0111
- * scm_tc7_substring = Gxxx1101
- * scm_tc7_mb_substring = Gxxx1111
*
- * TYP7S turns tc7_mb_string into tc7_string and
- * tc7_mb_substring into tc7_substring.
+ * For example, all strings have 0010 in the 'xxxx' bits
+ * in the diagram above, the S bit says whether it's a
+ * substring.
*
- * TYP7D turns tc7_mb_substring into tc7_mb_string and
- * tc7_substring into tc7_string.
+ * for example:
+ * S
+ * scm_tc7_string = G0010101
+ * scm_tc7_substring = G0010111
*
- * TYP7DS turns all string tags into tc7_string.
+ * TYP7S turns both string tags into tc7_string; thus,
+ * testing TYP7S against tc7_string is a quick way to
+ * test for any kind of string, shared or unshared.
*
* Some TC7 types are subdivided into 256 subtypes giving
* rise to the macros:
*
* TYP16
* TYP16S
- * GCTYP16
*
* TYP16S functions similarly wrt to TYP16 as TYP7S to TYP7,
* but a different option bit is used (bit 2 for TYP7S,
* bit 8 for TYP16S).
- *
- */
+ * */
/* {Non-immediate values.}
*
* If X is non-immediate, it is necessary to look at SCM_CAR (X) to
- * figure out Xs type. X may be a cons pair, in which case the
- * value SCM_CAR (x) will be either an immediate or non-immediate value.
- * X may be something other than a cons pair, in which case the value SCM_CAR (x)
- * will be a non-object value.
- *
- * All immediates and non-immediates have a 0 in bit 0. We additionally preserve
- * the invariant that all non-object values stored in the SCM_CAR of a non-immediate
- * object have a 1 in bit 1:
+ * figure out Xs type. X may be a cons pair, in which case the value
+ * SCM_CAR (x) will be either an immediate or non-immediate value. X
+ * may be something other than a cons pair, in which case the value
+ * SCM_CAR (x) will be a non-object value.
+ *
+ * All immediates and non-immediates have a 0 in bit 0. We
+ * additionally preserve the invariant that all non-object values
+ * stored in the SCM_CAR of a non-immediate object have a 1 in bit 1:
*/
-#define SCM_NCONSP(x) (1 & (int)SCM_CAR(x))
-#define SCM_CONSP(x) (!SCM_NCONSP(x))
+#define SCM_CONSP(x) (!SCM_IMP (x) && ((1 & SCM_CELL_TYPE (x)) == 0))
+#define SCM_NCONSP(x) (!SCM_CONSP (x))
-/* ECONSP is historical and, in fact, slightly buggy.
- * There are two places to fix where structures and glocs can be confused.
- * !!!
+/* SCM_ECONSP should be used instead of SCM_CONSP at places where GLOCS
+ * can be expected to occur.
*/
-#define SCM_ECONSP(x) (SCM_CONSP(x) || (1==SCM_TYP3(x)))
-#define SCM_NECONSP(x) (SCM_NCONSP(x) && (1 != SCM_TYP3(x)))
+#define SCM_ECONSP(x) \
+ (!SCM_IMP (x) \
+ && (SCM_CONSP (x) \
+ || (SCM_TYP3 (x) == 1 \
+ && (SCM_STRUCT_VTABLE_DATA (x)[scm_vtable_index_vcell] != 0))))
+#define SCM_NECONSP(x) (!SCM_ECONSP (x))
\f
-#define SCM_CELLP(x) (!SCM_NCELLP(x))
-#define SCM_NCELLP(x) ((sizeof(scm_cell)-1) & (int)(x))
+#define SCM_CELLP(x) (((sizeof (scm_cell) - 1) & SCM_UNPACK (x)) == 0)
+#define SCM_NCELLP(x) (!SCM_CELLP (x))
-/* See numbers.h for macros relating to immediate integers.
+/* See numbers.h for macros relating to immediate integers.
*/
-#define SCM_ITAG3(x) (7 & (int)x)
-#define SCM_TYP3(x) (7 & (int)SCM_CAR(x))
+#define SCM_ITAG3(x) (7 & SCM_UNPACK (x))
+#define SCM_TYP3(x) (7 & SCM_CELL_TYPE (x))
#define scm_tc3_cons 0
#define scm_tc3_cons_gloc 1
#define scm_tc3_int_1 2
-#define scm_tc3_closure 3
-#define scm_tc3_imm24 4
-#define scm_tc3_tc7_1 5
-#define scm_tc3_int_2 6
-#define scm_tc3_tc7_2 7
+#define scm_tc3_closure 3
+#define scm_tc3_imm24 4
+#define scm_tc3_tc7_1 5
+#define scm_tc3_int_2 6
+#define scm_tc3_tc7_2 7
/*
*/
-#define SCM_TYP7(x) (0x7f & (int)SCM_CAR(x))
-#define SCM_TYP7S(x) (0x7d & (int)SCM_CAR(x))
-#define SCM_TYP7SD(x) (0x75 & (int)SCM_CAR(x))
-#define SCM_TYP7D(x) (0x77 & (int)SCM_CAR(x))
-
-
-#define SCM_TYP16(x) (0xffff & (int)SCM_CAR(x))
-#define SCM_TYP16S(x) (0xfeff & (int)SCM_CAR(x))
-#define SCM_GCTYP16(x) (0xff7f & (int)SCM_CAR(x))
+#define SCM_ITAG7(x) (127 & SCM_UNPACK (x))
+#define SCM_TYP7(x) (0x7f & SCM_CELL_TYPE (x))
+#define SCM_TYP7S(x) ((0x7f & ~2) & SCM_CELL_TYPE (x))
+#define SCM_TYP16(x) (0xffff & SCM_CELL_TYPE (x))
+#define SCM_TYP16S(x) (0xfeff & SCM_CELL_TYPE (x))
-/* Testing and Changing GC Marks in Various Standard Positions
- */
-#define SCM_GCMARKP(x) (1 & (int)SCM_CDR(x))
-#define SCM_GC8MARKP(x) (0x80 & (int)SCM_CAR(x))
-#define SCM_SETGCMARK(x) (SCM_CDR(x) |= 1)
-#define SCM_CLRGCMARK(x) (SCM_CDR(x) &= ~1L)
-#define SCM_SETGC8MARK(x) (SCM_CAR(x) |= 0x80)
-#define SCM_CLRGC8MARK(x) (SCM_CAR(x) &= ~0x80L)
-
+#define SCM_TYP16_PREDICATE(tag,x) (SCM_NIMP (x) && SCM_TYP16 (x) == (tag))
\f
-/* couple */
-#define scm_tc7_ssymbol 5
-#define scm_tc7_msymbol 7
+#define scm_tc7_symbol 5
+/* free 7 */
/* couple */
#define scm_tc7_vector 13
#define scm_tc7_wvect 15
-/* a quad, two couples, two trists */
+/* couple */
#define scm_tc7_string 21
-#define scm_tc7_mb_string 23
-#define scm_tc7_substring 29
-#define scm_tc7_mb_substring 31
+#define scm_tc7_substring 23
/* Many of the following should be turned
* into structs or smobs. We need back some
* of these 7 bit tags!
*/
+#define scm_tc7_pws 31
+
+#ifdef HAVE_ARRAYS
+#define scm_tc7_llvect 29
#define scm_tc7_uvect 37
-#define scm_tc7_lvector 39
+/* free 39 */
#define scm_tc7_fvect 45
#define scm_tc7_dvect 47
#define scm_tc7_cvect 53
#define scm_tc7_svect 55
-#define scm_tc7_contin 61
-#define scm_tc7_cclo 63
-#define scm_tc7_rpsubr 69
#define scm_tc7_bvect 71
#define scm_tc7_byvect 77
#define scm_tc7_ivect 79
+#endif
+
+/* free 61 */
+#define scm_tc7_cclo 63
+#define scm_tc7_rpsubr 69
#define scm_tc7_subr_0 85
#define scm_tc7_subr_1 87
#define scm_tc7_cxr 93
#define scm_tc7_lsubr 119
-/* There are 256 port subtypes. Here are the first four.
- * These must agree with the init function in ports.c
+/* There are 256 port subtypes.
*/
#define scm_tc7_port 125
-/* fports and pipes form an intended TYP16S equivelancy
- * group (similar to a tc7 "couple".
- */
-#define scm_tc16_fport (scm_tc7_port + 0*256L)
-#define scm_tc16_pipe (scm_tc7_port + 1*256L)
-
-#define scm_tc16_strport (scm_tc7_port + 2*256L)
-#define scm_tc16_sfport (scm_tc7_port + 3*256L)
-
/* There are 256 smob subtypes. Here are the first four.
*/
*/
-/* scm_tc_free_cell is also the 0th smob type.
- */
-#define scm_tc_free_cell 127
-
-/* The 1st smob type:
- */
-#define scm_tc16_flo 0x017f
-#define scm_tc_flo 0x017fL
-
-/* Some option bits begeinning at bit 16 of scm_tc16_flo:
+/* scm_tc_free_cell is also the 0th smob type. We place this
+ * in free cells to tell the conservative marker not to trace it.
*/
-#define SCM_REAL_PART (1L<<16)
-#define SCM_IMAG_PART (2L<<16)
-#define scm_tc_dblr (scm_tc16_flo|SCM_REAL_PART)
-#define scm_tc_dblc (scm_tc16_flo|SCM_REAL_PART|SCM_IMAG_PART)
-
+#define scm_tc_free_cell (scm_tc7_smob + 0 * 256L)
-/* Smob types 2 and 3:
+/* Smob type 1 to 3 (note the dependency on the predicate SCM_NUMP)
*/
-#define scm_tc16_bigpos 0x027f
-#define scm_tc16_bigneg 0x037f
-
+#define scm_tc16_big (scm_tc7_smob + 1 * 256L)
+#define scm_tc16_real (scm_tc7_smob + 2 * 256L)
+#define scm_tc16_complex (scm_tc7_smob + 3 * 256L)
\f
-/* {Immediate Values}
+/* {Immediate Values}
*/
enum scm_tags
{
scm_tc8_char = 0xf4,
- scm_tc8_iloc = 0xfc,
+ scm_tc8_iloc = 0xfc
};
-#define SCM_ITAG8(X) ((int)(X) & 0xff)
-#define SCM_MAKE_ITAG8(X, TAG) (((X)<<8) + TAG)
-#define SCM_ITAG8_DATA(X) ((X)>>8)
+#define SCM_ITAG8(X) (SCM_UNPACK (X) & 0xff)
+#define SCM_MAKE_ITAG8(X, TAG) SCM_PACK (((X) << 8) + TAG)
+#define SCM_ITAG8_DATA(X) (SCM_UNPACK (X) >> 8)
\f
*/
/* SCM_ISYMP tests for ISPCSYM and ISYM */
-#define SCM_ISYMP(n) ((0x187 & (int)(n))==4)
+#define SCM_ISYMP(n) ((0x187 & SCM_UNPACK (n)) == 4)
/* SCM_IFLAGP tests for ISPCSYM, ISYM and IFLAG */
-#define SCM_IFLAGP(n) ((0x87 & (int)(n))==4)
-#define SCM_ISYMNUM(n) ((int)((n)>>9))
-#define SCM_ISYMSCM_CHARS(n) (scm_isymnames[SCM_ISYMNUM(n)])
-#define SCM_MAKSPCSYM(n) (((n)<<9)+((n)<<3)+4L)
-#define SCM_MAKISYM(n) (((n)<<9)+0x74L)
-#define SCM_MAKIFLAG(n) (((n)<<9)+0x174L)
-
-/* This table must agree with the declarations
+#define SCM_IFLAGP(n) ((0x87 & SCM_UNPACK (n)) == 4)
+#define SCM_ISYMNUM(n) (SCM_UNPACK (n) >> 9)
+#define SCM_ISYMCHARS(n) (scm_isymnames[SCM_ISYMNUM (n)])
+#define SCM_MAKSPCSYM(n) SCM_PACK (((n) << 9) + ((n) << 3) + 4L)
+#define SCM_MAKISYM(n) SCM_PACK (((n) << 9) + 0x74L)
+#define SCM_MAKIFLAG(n) SCM_PACK (((n) << 9) + 0x174L)
+
+extern char *scm_isymnames[]; /* defined in print.c */
+
+/* This table must agree with the declarations
* in repl.c: {Names of immediate symbols}.
*
* These are used only in eval but their values
*
*/
-#define SCM_IM_AND SCM_MAKSPCSYM(0)
-#define SCM_IM_BEGIN SCM_MAKSPCSYM(1)
-#define SCM_IM_CASE SCM_MAKSPCSYM(2)
-#define SCM_IM_COND SCM_MAKSPCSYM(3)
-#define SCM_IM_DO SCM_MAKSPCSYM(4)
-#define SCM_IM_IF SCM_MAKSPCSYM(5)
-#define SCM_IM_LAMBDA SCM_MAKSPCSYM(6)
-#define SCM_IM_LET SCM_MAKSPCSYM(7)
-#define SCM_IM_LETSTAR SCM_MAKSPCSYM(8)
-#define SCM_IM_LETREC SCM_MAKSPCSYM(9)
-#define SCM_IM_OR SCM_MAKSPCSYM(10)
-#define SCM_IM_QUOTE SCM_MAKSPCSYM(11)
-#define SCM_IM_SET SCM_MAKSPCSYM(12)
-#define SCM_IM_DEFINE SCM_MAKSPCSYM(13)
-#define SCM_IM_APPLY SCM_MAKISYM(14)
-#define SCM_IM_CONT SCM_MAKISYM(15)
-#define SCM_BOOL_F SCM_MAKIFLAG(16)
-#define SCM_BOOL_T SCM_MAKIFLAG(17)
-#define SCM_UNDEFINED SCM_MAKIFLAG(18)
-#define SCM_EOF_VAL SCM_MAKIFLAG(19)
-#define SCM_UNUSED_NIL_VALUE SCM_MAKIFLAG(20)
-#define SCM_UNSPECIFIED SCM_MAKIFLAG(21)
-
-
-#define SCM_UNBNDP(x) (SCM_UNDEFINED==(x))
+#define SCM_IM_AND SCM_MAKSPCSYM (0)
+#define SCM_IM_BEGIN SCM_MAKSPCSYM (1)
+#define SCM_IM_CASE SCM_MAKSPCSYM (2)
+#define SCM_IM_COND SCM_MAKSPCSYM (3)
+#define SCM_IM_DO SCM_MAKSPCSYM (4)
+#define SCM_IM_IF SCM_MAKSPCSYM (5)
+#define SCM_IM_LAMBDA SCM_MAKSPCSYM (6)
+#define SCM_IM_LET SCM_MAKSPCSYM (7)
+#define SCM_IM_LETSTAR SCM_MAKSPCSYM (8)
+#define SCM_IM_LETREC SCM_MAKSPCSYM (9)
+#define SCM_IM_OR SCM_MAKSPCSYM (10)
+#define SCM_IM_QUOTE SCM_MAKSPCSYM (11)
+#define SCM_IM_SET_X SCM_MAKSPCSYM (12)
+#define SCM_IM_DEFINE SCM_MAKSPCSYM (13)
+#define SCM_IM_APPLY SCM_MAKISYM (14)
+#define SCM_IM_CONT SCM_MAKISYM (15)
+#define SCM_BOOL_F SCM_MAKIFLAG (16)
+#define SCM_BOOL_T SCM_MAKIFLAG (17)
+#define SCM_UNDEFINED SCM_MAKIFLAG (18)
+#define SCM_EOF_VAL SCM_MAKIFLAG (19)
+#define SCM_EOL SCM_MAKIFLAG (20)
+#define SCM_UNSPECIFIED SCM_MAKIFLAG (21)
+#define SCM_IM_DISPATCH SCM_MAKISYM (22)
+#define SCM_IM_SLOT_REF SCM_MAKISYM (23)
+#define SCM_IM_SLOT_SET_X SCM_MAKISYM (24)
+
+/* Multi-language support */
+
+#define SCM_IM_NIL_COND SCM_MAKISYM (25)
+#define SCM_IM_NIL_IFY SCM_MAKISYM (26)
+#define SCM_IM_T_IFY SCM_MAKISYM (27)
+#define SCM_IM_0_COND SCM_MAKISYM (28)
+#define SCM_IM_0_IFY SCM_MAKISYM (29)
+#define SCM_IM_1_IFY SCM_MAKISYM (30)
+#define SCM_IM_BIND SCM_MAKISYM (31)
+
+#define SCM_IM_DELAY SCM_MAKISYM (32)
+#define SCM_IM_CALL_WITH_VALUES SCM_MAKISYM (33)
+
+/* When a variable is unbound this is marked by the SCM_UNDEFINED
+ * value. The following is an unbound value which can be handled on
+ * the Scheme level, i.e., it can be stored in and retrieved from a
+ * Scheme variable. This value is only intended to mark an unbound
+ * slot in GOOPS. It is needed now, but we should probably rewrite
+ * the code which handles this value in C so that SCM_UNDEFINED can be
+ * used instead. It is not ideal to let this kind of unique and
+ * strange values loose on the Scheme level.
+ */
+#define SCM_UNBOUND SCM_MAKIFLAG (33)
+
+#define SCM_UNBNDP(x) (SCM_EQ_P ((x), SCM_UNDEFINED))
\f
-/* Dispatching aids:
- */
+/* Dispatching aids: */
-/* For cons pairs with immediate values in the CAR
+/* For cons pairs with immediate values in the CAR
*/
#define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\
case scm_tc7_subr_3:case scm_tc7_subr_2:case scm_tc7_rpsubr:case scm_tc7_subr_1o:\
case scm_tc7_subr_2o:case scm_tc7_lsubr_2:case scm_tc7_lsubr
-#define scm_tcs_symbols scm_tc7_ssymbol:case scm_tc7_msymbol
+\f
-#define scm_tcs_bignums scm_tc16_bigpos:case scm_tc16_bigneg
+#if (SCM_DEBUG_DEPRECATED == 0)
-\f
-#ifdef __STDC__
+#define SCM_SLOPPY_CONSP(x) ((1 & SCM_CELL_TYPE (x)) == 0)
+#define SCM_SLOPPY_NCONSP(x) (!SCM_SLOPPY_CONSP(x))
-#else /* STDC */
+#define scm_tc7_ssymbol scm_tc7_symbol
+#define scm_tc7_msymbol scm_tc7_symbol
+#define scm_tcs_symbols scm_tc7_symbol
-#endif /* STDC */
+#endif /* SCM_DEBUG_DEPRECATED == 0 */
+#endif /* SCM_TAGS_H */
-#endif /* TAGSH */
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff