/* classes: h_files */
-#ifndef TAGSH
-#define TAGSH
-/* Copyright (C) 1995, 96, 97, 98, 99, 2000 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
\f
-
/* In the beginning was the Word:
*/
typedef long scm_bits_t;
-/*
- But as external interface, we use void*, which will be checked more strictly for
- dubious conversions.
+
+/* 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.
*/
-#define SCM_VOIDP_TEST
-#ifndef SCM_VOIDP_TEST
-typedef scm_bits_t SCM;
-#define SCM_UNPACK(x) (x)
-#define SCM_PACK(x) (x)
+ typedef struct scm_unused_struct * SCM;
+# define SCM_UNPACK(x) ((scm_bits_t) (x))
+# define SCM_PACK(x) ((SCM) (x))
#else
-typedef void * SCM;
-#define SCM_UNPACK(x) ((scm_bits_t) (x))
-#define SCM_PACK(x) ((SCM) (x))
+/* 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
-/* SCM_UNPACK_CAR is a convenience for treating the CAR of X as a word */
-#define SCM_UNPACK_CAR(x) SCM_UNPACK (SCM_CAR (x))
-
-/* 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
* gloc ..........SCM vcell..........001 ...........SCM cdr.............G
* struct ..........void * type........001 ...........void * data.........G
* closure ..........SCM code...........011 ...........SCM env.............G
- * tc7 .........long length....Gxxxx1S1 ..........void *data............
+ * tc7 ......24.bits of data...Gxxxx1S1 ..........void *data............
*
*
*
* 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 a length, thus
+ * bottom eight can be used to store some data, thus
* saving a word in the body itself. Thus, we use them
- * for strings, symbols, and vectors (among other
- * things).
+ * 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)
- *
- * For the interpretation of SCM_LENGTH and SCM_CHARS
- * that applies to a particular type, see the header file
- * for that type.
+ * TYP7(X) returns bits 0...6 of CELL_TYPE (X)
*
* Sometimes we choose the bottom seven bits carefully,
* so that the 2-valued bit (called S bit) can be masked
*
* TYP16
* TYP16S
- * GCTYP16
*
* TYP16S functions similarly wrt to TYP16 as TYP7S to TYP7,
* but a different option bit is used (bit 2 for TYP7S,
* stored in the SCM_CAR of a non-immediate object have a 1 in bit 1:
*/
-#define SCM_SLOPPY_NCONSP(x) (1 & SCM_UNPACK_CAR (x))
-#define SCM_SLOPPY_CONSP(x) (!SCM_SLOPPY_NCONSP (x))
-
-#define SCM_NCONSP(x) (SCM_IMP (x) || SCM_SLOPPY_NCONSP (x))
-#define SCM_CONSP(x) (SCM_NIMP (x) && SCM_SLOPPY_CONSP (x))
+#define SCM_CONSP(x) (!SCM_IMP (x) && ((1 & SCM_CELL_TYPE (x)) == 0))
+#define SCM_NCONSP(x) (!SCM_CONSP (x))
/* SCM_ECONSP should be used instead of SCM_CONSP at places where GLOCS
* can be expected to occur.
*/
-#define SCM_ECONSP(x) (SCM_NIMP (x) \
- && (SCM_SLOPPY_CONSP (x) \
- || (SCM_TYP3 (x) == 1 \
- && SCM_CDR (SCM_CAR (x) - 1) != 0)))
-#define SCM_NECONSP(x) (SCM_IMP (x) \
- || (SCM_SLOPPY_NCONSP (x) \
- && (SCM_TYP3 (x) != 1 \
- || SCM_CDR (SCM_CAR (x) - 1) == 0)))
+#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) & SCM_UNPACK (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.
*/
#define SCM_ITAG3(x) (7 & SCM_UNPACK (x))
-#define SCM_TYP3(x) (7 & SCM_UNPACK_CAR (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_TYP7(x) (0x7f & SCM_UNPACK_CAR (x))
-#define SCM_TYP7S(x) ((0x7f & ~2) & SCM_UNPACK_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_UNPACK_CAR (x))
-#define SCM_TYP16S(x) (0xfeff & SCM_UNPACK_CAR (x))
-#define SCM_GCTYP16(x) (0xff7f & SCM_UNPACK_CAR (x))
-
-
-
-/* Testing and Changing GC Marks in Various Standard Positions
- */
-#define SCM_GCMARKP(x) (1 & SCM_UNPACK (SCM_CDR (x)))
-#define SCM_GC8MARKP(x) (0x80 & SCM_UNPACK_CAR (x))
-#define SCM_SETGCMARK(x) SCM_SETOR_CDR (x, 1)
-#define SCM_CLRGCMARK(x) SCM_SETAND_CDR (x, ~1L)
-#define SCM_SETGC8MARK(x) SCM_SETOR_CAR (x, 0x80)
-#define SCM_CLRGC8MARK(x) SCM_SETAND_CAR (x, ~0x80L)
+#define SCM_TYP16(x) (0xffff & SCM_CELL_TYPE (x))
+#define SCM_TYP16S(x) (0xfeff & SCM_CELL_TYPE (x))
+#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
* of these 7 bit tags!
*/
#define scm_tc7_pws 31
-#define scm_tc7_lvector 39
#ifdef HAVE_ARRAYS
#define scm_tc7_llvect 29
#define scm_tc7_uvect 37
+/* free 39 */
#define scm_tc7_fvect 45
#define scm_tc7_dvect 47
#define scm_tc7_cvect 53
#define scm_tc7_ivect 79
#endif
-#define scm_tc7_contin 61
+/* free 61 */
#define scm_tc7_cclo 63
#define scm_tc7_rpsubr 69
#define scm_tc7_subr_0 85
#define scm_tc7_lsubr 119
-/* There are 256 port subtypes. Here are the first few.
- * These must agree with the init function in ports.c
+/* There are 256 port subtypes.
*/
#define scm_tc7_port 125
-#define scm_tc16_fport (scm_tc7_port + 0 * 256L)
-/* scm_tc16_pipe was here. */
-#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. We place this
* in free cells to tell the conservative marker not to trace it.
*/
-#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:
- */
-#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
-
-/* Smob type 4: this is allocated, but not initialized cells;
- this is required to prevent the gc from hosing your cells if
- you have to allocate while creating the cell*/
-
-#define scm_tc16_allocated 0x047f
-
+#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}
#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
*/
#define SCM_UNBOUND SCM_MAKIFLAG (33)
-#define SCM_UNBNDP(x) (SCM_UNDEFINED == (x))
+#define SCM_UNBNDP(x) (SCM_EQ_P ((x), SCM_UNDEFINED))
\f
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
+
+#if (SCM_DEBUG_DEPRECATED == 0)
+
+#define SCM_SLOPPY_CONSP(x) ((1 & SCM_CELL_TYPE (x)) == 0)
+#define SCM_SLOPPY_NCONSP(x) (!SCM_SLOPPY_CONSP(x))
-#define scm_tcs_bignums scm_tc16_bigpos:case scm_tc16_bigneg
+#define scm_tc7_ssymbol scm_tc7_symbol
+#define scm_tc7_msymbol scm_tc7_symbol
+#define scm_tcs_symbols scm_tc7_symbol
-#endif /* TAGSH */
+#endif /* SCM_DEBUG_DEPRECATED == 0 */
+
+#endif /* SCM_TAGS_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff