[thirdparty/binutils-gdb.git] / gdb / scm-tags.h

/* This is a minimally edited version of Guile's tags.h. */
/* classes: h_files */

#ifndef TAGSH
#define TAGSH
/*      Copyright (C) 1995, 1999 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 program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * 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 defines the format of SCM values and cons pairs.  
 ** It is here that tag bits are assigned for various purposes.
 **/
\f

/* Three Bit Tags

 * 000 -- a non-immediate value.  Points into the pair heap.  
 *
 * 001 -- a gloc (i.e., a resolved global variable in a CAR in a code graph)
 *        or the CAR of an object handle (i.e., the tagged pointer to the
 *        vtable part of a user-defined object).
 *
 *        If X has this tag, the value at CDAR(X - 1) distinguishes
 *        glocs from object handles.  The distinction only needs
 *        to be made in a few places.  Only a few parts of the code know
 *        about glocs.  In most cases, when a value in the CAR of a pair
 *        has the tag 001, it means that the pair is an object handle.
 *
 * 010 -- the tag for immediate, exact integers. 
 *
 * 011 -- in the CAR of a pair, this tag indicates that the pair is a closure.
 *        The remaining bits of the CAR are a pointer into the pair heap
 *        to the code graph for the closure.
 *
 * 1xy -- an extension tag which means that there is a five or six bit
 *        tag to the left of the low three bits.  See the nice diagrams
 *        in ../doc/code.doc if you want to know what the bits mean.
 */
\f


#define scm_tc3_cons		0
#define scm_tc3_cons_gloc	1
#define scm_tc3_closure		3

#define scm_tc7_ssymbol		5
#define scm_tc7_msymbol		7
#define scm_tc7_string		13
#define scm_tc7_bvect		15
#define scm_tc7_vector		21
#define scm_tc7_lvector		23
#define scm_tc7_ivect		29
#define scm_tc7_uvect		31
/* spare 37 39 */
#define scm_tc7_fvect		45
#define scm_tc7_dvect		47
#define scm_tc7_cvect		53
#define scm_tc7_port		55
#define scm_tc7_contin		61
#define scm_tc7_cclo		63
/* spare 69 71 77 79 */
#define scm_tc7_subr_0		85
#define scm_tc7_subr_1		87
#define scm_tc7_cxr		93
#define scm_tc7_subr_3		95
#define scm_tc7_subr_2		101
#define scm_tc7_asubr		103
#define scm_tc7_subr_1o		109
#define scm_tc7_subr_2o		111
#define scm_tc7_lsubr_2		117
#define scm_tc7_lsubr		119
#define scm_tc7_rpsubr		125

#define scm_tc7_smob		127
#define scm_tc_free_cell	127

#define scm_tc16_flo		0x017f
#define scm_tc_flo		0x017fL

#define SCM_REAL_PART		(1L<<16)
#define SCM_IMAG_PART		(2L<<16)
#define scm_tc_dblr		(scm_tc16_flo|REAL_PART)
#define scm_tc_dblc		(scm_tc16_flo|REAL_PART|IMAG_PART)

#define scm_tc16_bigpos		0x027f
#define scm_tc16_bigneg		0x037f

#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)


/* For cons pairs with immediate values in the CAR */
#define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\
 case 12:case 14:case 18:case 20:\
 case 22:case 26:case 28:case 30:\
 case 34:case 36:case 38:case 42:\
 case 44:case 46:case 50:case 52:\
 case 54:case 58:case 60:case 62:\
 case 66:case 68:case 70:case 74:\
 case 76:case 78:case 82:case 84:\
 case 86:case 90:case 92:case 94:\
 case 98:case 100:case 102:case 106:\
 case 108:case 110:case 114:case 116:\
 case 118:case 122:case 124:case 126

/* For cons pairs with non-immediate values in the CAR */
#define scm_tcs_cons_nimcar 0:case 8:case 16:case 24:\
 case 32:case 40:case 48:case 56:\
 case 64:case 72:case 80:case 88:\
 case 96:case 104:case 112:case 120

/* A CONS_GLOC occurs in code.  It's CAR is a pointer to the
 * CDR of a variable.  The low order bits of the CAR are 001.
 * The CDR of the gloc is the code continuation.
 */
#define scm_tcs_cons_gloc 1:case 9:case 17:case 25:\
 case 33:case 41:case 49:case 57:\
 case 65:case 73:case 81:case 89:\
 case 97:case 105:case 113:case 121

#define scm_tcs_closures   3:case 11:case 19:case 27:\
 case 35:case 43:case 51:case 59:\
 case 67:case 75:case 83:case 91:\
 case 99:case 107:case 115:case 123

#define scm_tcs_subrs scm_tc7_asubr:case scm_tc7_subr_0:case scm_tc7_subr_1:case scm_tc7_cxr:\
 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

#define scm_tcs_bignums tc16_bigpos:case tc16_bigneg
\f


/* References to objects are of type SCM.  Values may be non-immediate
 * (pointers) or immediate (encoded, immutable, scalar values that fit
 * in an SCM variable).
 */

typedef long SCM;

/* 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.
 */
#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 */
\f


/* Immediate? Predicates 
 */
#define SCM_IMP(x) 	(6 & (int)(x))
#define SCM_NIMP(x) 	(!SCM_IMP(x))
\f


enum scm_tags
  {
    scm_tc8_char = 0xf4
  };

#define SCM_ITAG8(X)		((int)(X) & 0xff)
#define SCM_MAKE_ITAG8(X, TAG)	(((X)<<8) + TAG)
#define SCM_ITAG8_DATA(X)	((X)>>8)
\f


/* Local Environment Structure
 */
#define SCM_ILOCP(n)		((0xff & (int)(n))==0xfc)
#define SCM_ILOC00		(0x000000fcL)
#define SCM_IDINC		(0x00100000L)
#define SCM_ICDR		(0x00080000L)
#define SCM_IFRINC		(0x00000100L)
#define SCM_IDSTMSK		(-SCM_IDINC)
#define SCM_IFRAME(n) 		((int)((SCM_ICDR-SCM_IFRINC)>>8) & ((int)(n)>>8))
#define SCM_IDIST(n) 		(((unsigned long)(n))>>20)
#define SCM_ICDRP(n) 		(SCM_ICDR & (n))
\f

/* Immediate Symbols, Special Symbols, Flags (various constants).
 */

/* ISYMP tests for ISPCSYM and ISYM */
#define SCM_ISYMP(n) 		((0x187 & (int)(n))==4)

/* IFLAGP tests for ISPCSYM, ISYM and IFLAG */
#define SCM_IFLAGP(n) 		((0x87 & (int)(n))==4)
#define SCM_ISYMNUM(n) 		((int)((n)>>9))
#define SCM_ISYMCHARS(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 
 * in repl.c: {Names of immediate symbols}.
 *
 * These are used only in eval but their values
 * have to be allocated here.
 *
 */

#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_NUM_ISYMS 16

/* Important immediates
 */

#define SCM_BOOL_F		SCM_MAKIFLAG(SCM_NUM_ISYMS+0)
#define SCM_BOOL_T 		SCM_MAKIFLAG(SCM_NUM_ISYMS+1)
#define SCM_UNDEFINED	 	SCM_MAKIFLAG(SCM_NUM_ISYMS+2)
#define SCM_EOF_VAL 		SCM_MAKIFLAG(SCM_NUM_ISYMS+3)

#ifdef SICP
#define SCM_EOL 		SCM_BOOL_F
#else
#define SCM_EOL			SCM_MAKIFLAG(SCM_NUM_ISYMS+4)
#endif

#define SCM_UNSPECIFIED		SCM_MAKIFLAG(SCM_NUM_ISYMS+5)
\f


/* Heap Pairs and the Empty List Predicates
 */
#define SCM_NULLP(x) 	(SCM_EOL == (x))
#define SCM_NNULLP(x) 	(SCM_EOL != (x))
#define SCM_CELLP(x) 	(!SCM_NCELLP(x))
#define SCM_NCELLP(x) 	((sizeof(scm_cell)-1) & (int)(x))
\f


#define SCM_UNBNDP(x) 	(SCM_UNDEFINED==(x))
\f


/* 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)
\f

/* Extracting Tag Bits, With or Without GC Safety and Optional Bits
 */
#define SCM_TYP3(x) 		(7 & (int)SCM_CAR(x))
#define SCM_TYP7(x) 		(0x7f & (int)SCM_CAR(x))
#define SCM_TYP7S(x) 		(0x7d & (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))
\f

/* Two slightly extensible types: smobs and ptobs.

 */
#define SCM_SMOBNUM(x) (0x0ff & (CAR(x)>>8));
#define SCM_PTOBNUM(x) (0x0ff & (CAR(x)>>8));
\f


#define SCM_DIRP(x) (SCM_NIMP(x) && (TYP16(x)==(scm_tc16_dir)))
#define SCM_OPDIRP(x) (SCM_NIMP(x) && (CAR(x)==(scm_tc16_dir | OPN)))
\f


/* Lvectors 
 */
#define SCM_LVECTORP(x) (TYP7(x)==tc7_lvector)
\f

#if 0
\f
/* Sockets 
 */
#define tc_socket (tc7_port | OPN)
#define SCM_SOCKP(x) (((0x7f | OPN | RDNG | WRTNG) & CAR(x))==(tc_socket))
#define SCM_SOCKTYP(x) (CAR(x)>>24)
\f


extern int scm_tc16_key_vector;
#define SCM_KEYVECP(X)   (scm_tc16_key_vector == TYP16 (X))
#define SCM_KEYVECLEN(OBJ) (((unsigned long)CAR (obj)) >> 16)
\f

#define SCM_MALLOCDATA(obj) ((char *)CDR(obj))
#define SCM_MALLOCLEN(obj) (((unsigned long)CAR (obj)) >> 16)
#define SCM_WORDDATA(obj)  (CDR (obj))


#define SCM_BYTECODEP(X) ((TYP7 (X) == tc7_cclo) && (CCLO_SUBR (X) == rb_proc))
#define SCM_BYTECODE_CONSTANTS(X) (VELTS(X)[1])
#define SCM_BYTECODE_CODE(X) (VELTS(X)[2])
#define SCM_BYTECODE_NAME(X) (VELTS(X)[3])
#define SCM_BYTECODE_BCODE(X) (VELTS(X)[4])
#define SCM_BYTECODE_ELTS 5
\f

#define SCM_FREEP(x) (CAR(x)==tc_free_cell)
#define SCM_NFREEP(x) (!FREEP(x))
\f
#endif /* 0 */
\f

#endif /* TAGSH */
Commit	Line	Data
c906108c SS	1	/* This is a minimally edited version of Guile's tags.h. */
	2	/* classes: h_files */
	3
	4	#ifndef TAGSH
	5	#define TAGSH
197e01b6	6	/* Copyright (C) 1995, 1999 Free Software Foundation, Inc.
c5aa993b	7
c906108c SS	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2, or (at your option)
	11	* any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
197e01b6 EZ	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor,
197e01b6 EZ	21	* Boston, MA 02110-1301, USA.
c906108c SS	22	*
	23	* As a special exception, the Free Software Foundation gives permission
	24	* for additional uses of the text contained in its release of GUILE.
	25	*
	26	* The exception is that, if you link the GUILE library with other files
	27	* to produce an executable, this does not by itself cause the
	28	* resulting executable to be covered by the GNU General Public License.
	29	* Your use of that executable is in no way restricted on account of
	30	* linking the GUILE library code into it.
	31	*
	32	* This exception does not however invalidate any other reasons why
	33	* the executable file might be covered by the GNU General Public License.
	34	*
	35	* This exception applies only to the code released by the
	36	* Free Software Foundation under the name GUILE. If you copy
	37	* code from other Free Software Foundation releases into a copy of
	38	* GUILE, as the General Public License permits, the exception does
	39	* not apply to the code that you add in this way. To avoid misleading
	40	* anyone as to the status of such modified files, you must delete
	41	* this exception notice from them.
	42	*
	43	* If you write modifications of your own for GUILE, it is your choice
	44	* whether to permit this exception to apply to your modifications.
	45	* If you do not wish that, delete this exception notice.
	46	*/
	47	\f
	48
	49	/** This file defines the format of SCM values and cons pairs.
	50	** It is here that tag bits are assigned for various purposes.
	51	**/
c906108c	52	\f
c5aa993b	53
c906108c	54	/* Three Bit Tags
c5aa993b	55
c906108c SS	56	* 000 -- a non-immediate value. Points into the pair heap.
	57	*
	58	* 001 -- a gloc (i.e., a resolved global variable in a CAR in a code graph)
c5aa993b JM	59	* or the CAR of an object handle (i.e., the tagged pointer to the
c5aa993b JM	60	* vtable part of a user-defined object).
c906108c SS	61	*
c906108c SS	62	* If X has this tag, the value at CDAR(X - 1) distinguishes
c5aa993b JM	63	* glocs from object handles. The distinction only needs
	64	* to be made in a few places. Only a few parts of the code know
	65	* about glocs. In most cases, when a value in the CAR of a pair
	66	* has the tag 001, it means that the pair is an object handle.
c906108c SS	67	*
	68	* 010 -- the tag for immediate, exact integers.
	69	*
	70	* 011 -- in the CAR of a pair, this tag indicates that the pair is a closure.
c5aa993b JM	71	* The remaining bits of the CAR are a pointer into the pair heap
c5aa993b JM	72	* to the code graph for the closure.
c906108c SS	73	*
c906108c SS	74	* 1xy -- an extension tag which means that there is a five or six bit
c5aa993b JM	75	* tag to the left of the low three bits. See the nice diagrams
c5aa993b JM	76	* in ../doc/code.doc if you want to know what the bits mean.
c906108c	77	*/
c906108c SS	78	\f
	79
	80
	81
c5aa993b	82
c906108c SS	83	#define scm_tc3_cons 0
	84	#define scm_tc3_cons_gloc 1
	85	#define scm_tc3_closure 3
	86
	87	#define scm_tc7_ssymbol 5
	88	#define scm_tc7_msymbol 7
	89	#define scm_tc7_string 13
	90	#define scm_tc7_bvect 15
	91	#define scm_tc7_vector 21
	92	#define scm_tc7_lvector 23
	93	#define scm_tc7_ivect 29
	94	#define scm_tc7_uvect 31
	95	/* spare 37 39 */
	96	#define scm_tc7_fvect 45
	97	#define scm_tc7_dvect 47
	98	#define scm_tc7_cvect 53
	99	#define scm_tc7_port 55
	100	#define scm_tc7_contin 61
	101	#define scm_tc7_cclo 63
	102	/* spare 69 71 77 79 */
	103	#define scm_tc7_subr_0 85
	104	#define scm_tc7_subr_1 87
	105	#define scm_tc7_cxr 93
	106	#define scm_tc7_subr_3 95
	107	#define scm_tc7_subr_2 101
	108	#define scm_tc7_asubr 103
	109	#define scm_tc7_subr_1o 109
	110	#define scm_tc7_subr_2o 111
	111	#define scm_tc7_lsubr_2 117
	112	#define scm_tc7_lsubr 119
	113	#define scm_tc7_rpsubr 125
	114
	115	#define scm_tc7_smob 127
	116	#define scm_tc_free_cell 127
	117
	118	#define scm_tc16_flo 0x017f
	119	#define scm_tc_flo 0x017fL
	120
	121	#define SCM_REAL_PART (1L<<16)
	122	#define SCM_IMAG_PART (2L<<16)
	123	#define scm_tc_dblr (scm_tc16_flo\|REAL_PART)
	124	#define scm_tc_dblc (scm_tc16_flo\|REAL_PART\|IMAG_PART)
	125
	126	#define scm_tc16_bigpos 0x027f
	127	#define scm_tc16_bigneg 0x037f
	128
	129	#define scm_tc16_fport (scm_tc7_port + 0*256L)
	130	#define scm_tc16_pipe (scm_tc7_port + 1*256L)
	131	#define scm_tc16_strport (scm_tc7_port + 2*256L)
	132	#define scm_tc16_sfport (scm_tc7_port + 3*256L)
	133
	134
	135
	136	/* For cons pairs with immediate values in the CAR */
	137	#define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\
	138	case 12:case 14:case 18:case 20:\
	139	case 22:case 26:case 28:case 30:\
	140	case 34:case 36:case 38:case 42:\
	141	case 44:case 46:case 50:case 52:\
	142	case 54:case 58:case 60:case 62:\
	143	case 66:case 68:case 70:case 74:\
	144	case 76:case 78:case 82:case 84:\
	145	case 86:case 90:case 92:case 94:\
	146	case 98:case 100:case 102:case 106:\
147	case 108:case 110:case 114:case 116:\
148	case 118:case 122:case 124:case 126
149
150	/* For cons pairs with non-immediate values in the CAR */
151	#define scm_tcs_cons_nimcar 0:case 8:case 16:case 24:\
152	case 32:case 40:case 48:case 56:\
153	case 64:case 72:case 80:case 88:\
154	case 96:case 104:case 112:case 120
155
156	/* A CONS_GLOC occurs in code. It's CAR is a pointer to the
157	* CDR of a variable. The low order bits of the CAR are 001.
158	* The CDR of the gloc is the code continuation.
159	*/
160	#define scm_tcs_cons_gloc 1:case 9:case 17:case 25:\
161	case 33:case 41:case 49:case 57:\
162	case 65:case 73:case 81:case 89:\
163	case 97:case 105:case 113:case 121
164
165	#define scm_tcs_closures 3:case 11:case 19:case 27:\
166	case 35:case 43:case 51:case 59:\
167	case 67:case 75:case 83:case 91:\
168	case 99:case 107:case 115:case 123
169
170	#define scm_tcs_subrs scm_tc7_asubr:case scm_tc7_subr_0:case scm_tc7_subr_1:case scm_tc7_cxr:\
171	case scm_tc7_subr_3:case scm_tc7_subr_2:case scm_tc7_rpsubr:case scm_tc7_subr_1o:\
172	case scm_tc7_subr_2o:case scm_tc7_lsubr_2:case scm_tc7_lsubr
173
174	#define scm_tcs_symbols scm_tc7_ssymbol:case scm_tc7_msymbol
175
176	#define scm_tcs_bignums tc16_bigpos:case tc16_bigneg
c906108c SS	177	\f
c906108c SS	178
c5aa993b	179
c906108c SS	180	/* References to objects are of type SCM. Values may be non-immediate
	181	* (pointers) or immediate (encoded, immutable, scalar values that fit
	182	* in an SCM variable).
	183	*/
	184
	185	typedef long SCM;
	186
	187	/* Cray machines have pointers that are incremented once for each word,
	188	* rather than each byte, the 3 most significant bits encode the byte
	189	* within the word. The following macros deal with this by storing the
	190	* native Cray pointers like the ones that looks like scm expects. This
	191	* is done for any pointers that might appear in the car of a scm_cell, pointers
	192	* to scm_vector elts, functions, &c are not munged.
	193	*/
	194	#ifdef _UNICOS
c5aa993b JM	195	#define SCM2PTR(x) ((int)(x) >> 3)
	196	#define PTR2SCM(x) (((SCM)(x)) << 3)
	197	#define SCM_POINTERS_MUNGED
c906108c	198	#else
c5aa993b JM	199	#define SCM2PTR(x) (x)
c5aa993b JM	200	#define PTR2SCM(x) ((SCM)(x))
c906108c	201	#endif /* def _UNICOS */
c906108c SS	202	\f
c906108c SS	203
c5aa993b	204
c906108c SS	205	/* Immediate? Predicates
	206	*/
	207	#define SCM_IMP(x) (6 & (int)(x))
	208	#define SCM_NIMP(x) (!SCM_IMP(x))
c906108c SS	209	\f
c906108c SS	210
c5aa993b	211
c906108c	212	enum scm_tags
c5aa993b JM	213	{
	214	scm_tc8_char = 0xf4
	215	};
c906108c SS	216
	217	#define SCM_ITAG8(X) ((int)(X) & 0xff)
	218	#define SCM_MAKE_ITAG8(X, TAG) (((X)<<8) + TAG)
	219	#define SCM_ITAG8_DATA(X) ((X)>>8)
c5aa993b	220	\f
c906108c SS	221
c906108c SS	222
c906108c SS	223	/* Local Environment Structure
	224	*/
	225	#define SCM_ILOCP(n) ((0xff & (int)(n))==0xfc)
	226	#define SCM_ILOC00 (0x000000fcL)
	227	#define SCM_IDINC (0x00100000L)
	228	#define SCM_ICDR (0x00080000L)
	229	#define SCM_IFRINC (0x00000100L)
	230	#define SCM_IDSTMSK (-SCM_IDINC)
	231	#define SCM_IFRAME(n) ((int)((SCM_ICDR-SCM_IFRINC)>>8) & ((int)(n)>>8))
	232	#define SCM_IDIST(n) (((unsigned long)(n))>>20)
	233	#define SCM_ICDRP(n) (SCM_ICDR & (n))
c906108c	234	\f
c5aa993b	235
c906108c SS	236	/* Immediate Symbols, Special Symbols, Flags (various constants).
	237	*/
	238
	239	/* ISYMP tests for ISPCSYM and ISYM */
	240	#define SCM_ISYMP(n) ((0x187 & (int)(n))==4)
	241
	242	/* IFLAGP tests for ISPCSYM, ISYM and IFLAG */
	243	#define SCM_IFLAGP(n) ((0x87 & (int)(n))==4)
	244	#define SCM_ISYMNUM(n) ((int)((n)>>9))
	245	#define SCM_ISYMCHARS(n) (scm_isymnames[SCM_ISYMNUM(n)])
	246	#define SCM_MAKSPCSYM(n) (((n)<<9)+((n)<<3)+4L)
	247	#define SCM_MAKISYM(n) (((n)<<9)+0x74L)
	248	#define SCM_MAKIFLAG(n) (((n)<<9)+0x174L)
	249
	250	/* This table must agree with the declarations
	251	* in repl.c: {Names of immediate symbols}.
	252	*
	253	* These are used only in eval but their values
	254	* have to be allocated here.
	255	*
	256	*/
	257
	258	#define SCM_IM_AND SCM_MAKSPCSYM(0)
	259	#define SCM_IM_BEGIN SCM_MAKSPCSYM(1)
	260	#define SCM_IM_CASE SCM_MAKSPCSYM(2)
	261	#define SCM_IM_COND SCM_MAKSPCSYM(3)
	262	#define SCM_IM_DO SCM_MAKSPCSYM(4)
	263	#define SCM_IM_IF SCM_MAKSPCSYM(5)
	264	#define SCM_IM_LAMBDA SCM_MAKSPCSYM(6)
	265	#define SCM_IM_LET SCM_MAKSPCSYM(7)
	266	#define SCM_IM_LETSTAR SCM_MAKSPCSYM(8)
	267	#define SCM_IM_LETREC SCM_MAKSPCSYM(9)
	268	#define SCM_IM_OR SCM_MAKSPCSYM(10)
	269	#define SCM_IM_QUOTE SCM_MAKSPCSYM(11)
	270	#define SCM_IM_SET SCM_MAKSPCSYM(12)
	271	#define SCM_IM_DEFINE SCM_MAKSPCSYM(13)
	272	#define SCM_IM_APPLY SCM_MAKISYM(14)
	273	#define SCM_IM_CONT SCM_MAKISYM(15)
	274	#define SCM_NUM_ISYMS 16
	275
	276	/* Important immediates
	277	*/
	278
	279	#define SCM_BOOL_F SCM_MAKIFLAG(SCM_NUM_ISYMS+0)
	280	#define SCM_BOOL_T SCM_MAKIFLAG(SCM_NUM_ISYMS+1)
	281	#define SCM_UNDEFINED SCM_MAKIFLAG(SCM_NUM_ISYMS+2)
	282	#define SCM_EOF_VAL SCM_MAKIFLAG(SCM_NUM_ISYMS+3)
	283
	284	#ifdef SICP
	285	#define SCM_EOL SCM_BOOL_F
	286	#else
	287	#define SCM_EOL SCM_MAKIFLAG(SCM_NUM_ISYMS+4)
	288	#endif
	289
	290	#define SCM_UNSPECIFIED SCM_MAKIFLAG(SCM_NUM_ISYMS+5)
c906108c SS	291	\f
c906108c SS	292
c5aa993b	293
c906108c SS	294	/* Heap Pairs and the Empty List Predicates
	295	*/
	296	#define SCM_NULLP(x) (SCM_EOL == (x))
	297	#define SCM_NNULLP(x) (SCM_EOL != (x))
	298	#define SCM_CELLP(x) (!SCM_NCELLP(x))
	299	#define SCM_NCELLP(x) ((sizeof(scm_cell)-1) & (int)(x))
c5aa993b	300	\f
c906108c SS	301
c906108c SS	302
c906108c	303	#define SCM_UNBNDP(x) (SCM_UNDEFINED==(x))
c906108c SS	304	\f
c906108c SS	305
c5aa993b	306
c906108c SS	307	/* Testing and Changing GC Marks in Various Standard Positions
	308	*/
	309	#define SCM_GCMARKP(x) (1 & (int)SCM_CDR(x))
	310	#define SCM_GC8MARKP(x) (0x80 & (int)SCM_CAR(x))
	311	#define SCM_SETGCMARK(x) (SCM_CDR(x) \|= 1)
	312	#define SCM_CLRGCMARK(x) (SCM_CDR(x) &= ~1L)
	313	#define SCM_SETGC8MARK(x) (SCM_CAR(x) \|= 0x80)
	314	#define SCM_CLRGC8MARK(x) (SCM_CAR(x) &= ~0x80L)
c906108c	315	\f
c5aa993b	316
c906108c SS	317	/* Extracting Tag Bits, With or Without GC Safety and Optional Bits
	318	*/
	319	#define SCM_TYP3(x) (7 & (int)SCM_CAR(x))
	320	#define SCM_TYP7(x) (0x7f & (int)SCM_CAR(x))
	321	#define SCM_TYP7S(x) (0x7d & (int)SCM_CAR(x))
	322	#define SCM_TYP16(x) (0xffff & (int)SCM_CAR(x))
	323	#define SCM_TYP16S(x) (0xfeff & (int)SCM_CAR(x))
	324	#define SCM_GCTYP16(x) (0xff7f & (int)SCM_CAR(x))
c906108c	325	\f
c5aa993b	326
c906108c	327	/* Two slightly extensible types: smobs and ptobs.
c5aa993b	328
c906108c SS	329	*/
	330	#define SCM_SMOBNUM(x) (0x0ff & (CAR(x)>>8));
	331	#define SCM_PTOBNUM(x) (0x0ff & (CAR(x)>>8));
c5aa993b	332	\f
c906108c SS	333
c906108c SS	334
c906108c SS	335
	336	#define SCM_DIRP(x) (SCM_NIMP(x) && (TYP16(x)==(scm_tc16_dir)))
	337	#define SCM_OPDIRP(x) (SCM_NIMP(x) && (CAR(x)==(scm_tc16_dir \| OPN)))
c906108c SS	338	\f
c906108c SS	339
c5aa993b	340
c906108c SS	341	/* Lvectors
	342	*/
	343	#define SCM_LVECTORP(x) (TYP7(x)==tc7_lvector)
c906108c	344	\f
c5aa993b	345
c906108c SS	346	#if 0
	347	\f
	348	/* Sockets
	349	*/
	350	#define tc_socket (tc7_port \| OPN)
	351	#define SCM_SOCKP(x) (((0x7f \| OPN \| RDNG \| WRTNG) & CAR(x))==(tc_socket))
	352	#define SCM_SOCKTYP(x) (CAR(x)>>24)
c906108c SS	353	\f
c906108c SS	354
c5aa993b	355
c906108c SS	356	extern int scm_tc16_key_vector;
	357	#define SCM_KEYVECP(X) (scm_tc16_key_vector == TYP16 (X))
	358	#define SCM_KEYVECLEN(OBJ) (((unsigned long)CAR (obj)) >> 16)
c906108c	359	\f
c5aa993b	360
c906108c SS	361	#define SCM_MALLOCDATA(obj) ((char *)CDR(obj))
	362	#define SCM_MALLOCLEN(obj) (((unsigned long)CAR (obj)) >> 16)
	363	#define SCM_WORDDATA(obj) (CDR (obj))
	364
	365
	366	#define SCM_BYTECODEP(X) ((TYP7 (X) == tc7_cclo) && (CCLO_SUBR (X) == rb_proc))
	367	#define SCM_BYTECODE_CONSTANTS(X) (VELTS(X)[1])
	368	#define SCM_BYTECODE_CODE(X) (VELTS(X)[2])
	369	#define SCM_BYTECODE_NAME(X) (VELTS(X)[3])
	370	#define SCM_BYTECODE_BCODE(X) (VELTS(X)[4])
	371	#define SCM_BYTECODE_ELTS 5
c906108c	372	\f
c5aa993b	373
c906108c SS	374	#define SCM_FREEP(x) (CAR(x)==tc_free_cell)
	375	#define SCM_NFREEP(x) (!FREEP(x))
	376	\f
c5aa993b	377	#endif /* 0 */
c906108c	378	\f
c906108c	379
c5aa993b	380	#endif /* TAGSH */