gdb/scm-tags.h - binutils-gdb - Git at Google

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

 #ifndef TAGSH
 #define TAGSH
 /*      Copyright 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., 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.
  *
  * 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.
  */


 /** This file defines the format of SCM values and cons pairs.
  ** It is here that tag bits are assigned for various purposes.
  **/


 /* 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.
  */


 #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


 /* 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 */


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


 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)


 /* 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))


 /* 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)


 /* 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))


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


 /* 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))


 /* Two slightly extensible types: smobs and ptobs.

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


 #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)))


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


 #if 0

 /* 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)


 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)


 #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


 #define SCM_FREEP(x) (CAR(x)==tc_free_cell)
 #define SCM_NFREEP(x) (!FREEP(x))

 #endif /* 0 */


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

	#ifndef TAGSH
	#define TAGSH
	/* Copyright 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., 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.
	*
	* 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.
	*/


	/** This file defines the format of SCM values and cons pairs.
	** It is here that tag bits are assigned for various purposes.
	**/


	/* 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.
	*/





	#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



	/* 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 */



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



	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)



	/* 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))


	/* 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)



	/* 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))



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


	/* 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))


	/* Two slightly extensible types: smobs and ptobs.

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




	#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)))



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


	#if 0

	/* 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)



	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)


	#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


	#define SCM_FREEP(x) (CAR(x)==tc_free_cell)
	#define SCM_NFREEP(x) (!FREEP(x))

	#endif /* 0 */


	#endif /* TAGSH */