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

/* classes: h_files */

#ifndef TAGSH

#define TAGSH

/*      Copyright (C) 1995 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 */

#ifdef __STDC__

#else /* STDC */

#endif /* STDC */

#endif /* TAGSH */