119370Spst/* This is a minimally edited version of Guile's tags.h. */ 219370Spst/* classes: h_files */ 319370Spst 419370Spst#ifndef TAGSH 519370Spst#define TAGSH 698944Sobrien/* Copyright 1995, 1999 Free Software Foundation, Inc. 798944Sobrien 819370Spst * This program is free software; you can redistribute it and/or modify 919370Spst * it under the terms of the GNU General Public License as published by 1019370Spst * the Free Software Foundation; either version 2, or (at your option) 1119370Spst * any later version. 1219370Spst * 1319370Spst * This program is distributed in the hope that it will be useful, 1419370Spst * but WITHOUT ANY WARRANTY; without even the implied warranty of 1519370Spst * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1619370Spst * GNU General Public License for more details. 1719370Spst * 1819370Spst * You should have received a copy of the GNU General Public License 1946283Sdfr * along with this program; if not, write to the Free Software 2046283Sdfr * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 2119370Spst * 2219370Spst * As a special exception, the Free Software Foundation gives permission 2319370Spst * for additional uses of the text contained in its release of GUILE. 2419370Spst * 2519370Spst * The exception is that, if you link the GUILE library with other files 2619370Spst * to produce an executable, this does not by itself cause the 2719370Spst * resulting executable to be covered by the GNU General Public License. 2819370Spst * Your use of that executable is in no way restricted on account of 2919370Spst * linking the GUILE library code into it. 3019370Spst * 3119370Spst * This exception does not however invalidate any other reasons why 3219370Spst * the executable file might be covered by the GNU General Public License. 3319370Spst * 3419370Spst * This exception applies only to the code released by the 3519370Spst * Free Software Foundation under the name GUILE. If you copy 3619370Spst * code from other Free Software Foundation releases into a copy of 3719370Spst * GUILE, as the General Public License permits, the exception does 3819370Spst * not apply to the code that you add in this way. To avoid misleading 3919370Spst * anyone as to the status of such modified files, you must delete 4019370Spst * this exception notice from them. 4119370Spst * 4219370Spst * If you write modifications of your own for GUILE, it is your choice 4319370Spst * whether to permit this exception to apply to your modifications. 4419370Spst * If you do not wish that, delete this exception notice. 4519370Spst */ 4619370Spst 4719370Spst 4819370Spst/** This file defines the format of SCM values and cons pairs. 4919370Spst ** It is here that tag bits are assigned for various purposes. 5019370Spst **/ 5198944Sobrien 5219370Spst 5319370Spst/* Three Bit Tags 5498944Sobrien 5519370Spst * 000 -- a non-immediate value. Points into the pair heap. 5619370Spst * 5719370Spst * 001 -- a gloc (i.e., a resolved global variable in a CAR in a code graph) 5898944Sobrien * or the CAR of an object handle (i.e., the tagged pointer to the 5998944Sobrien * vtable part of a user-defined object). 6019370Spst * 6119370Spst * If X has this tag, the value at CDAR(X - 1) distinguishes 6298944Sobrien * glocs from object handles. The distinction only needs 6398944Sobrien * to be made in a few places. Only a few parts of the code know 6498944Sobrien * about glocs. In most cases, when a value in the CAR of a pair 6598944Sobrien * has the tag 001, it means that the pair is an object handle. 6619370Spst * 6719370Spst * 010 -- the tag for immediate, exact integers. 6819370Spst * 6919370Spst * 011 -- in the CAR of a pair, this tag indicates that the pair is a closure. 7098944Sobrien * The remaining bits of the CAR are a pointer into the pair heap 7198944Sobrien * to the code graph for the closure. 7219370Spst * 7319370Spst * 1xy -- an extension tag which means that there is a five or six bit 7498944Sobrien * tag to the left of the low three bits. See the nice diagrams 7598944Sobrien * in ../doc/code.doc if you want to know what the bits mean. 7619370Spst */ 7719370Spst 7819370Spst 7919370Spst 8019370Spst 8198944Sobrien 8219370Spst#define scm_tc3_cons 0 8319370Spst#define scm_tc3_cons_gloc 1 8419370Spst#define scm_tc3_closure 3 8519370Spst 8619370Spst#define scm_tc7_ssymbol 5 8719370Spst#define scm_tc7_msymbol 7 8819370Spst#define scm_tc7_string 13 8919370Spst#define scm_tc7_bvect 15 9019370Spst#define scm_tc7_vector 21 9119370Spst#define scm_tc7_lvector 23 9219370Spst#define scm_tc7_ivect 29 9319370Spst#define scm_tc7_uvect 31 9419370Spst/* spare 37 39 */ 9519370Spst#define scm_tc7_fvect 45 9619370Spst#define scm_tc7_dvect 47 9719370Spst#define scm_tc7_cvect 53 9819370Spst#define scm_tc7_port 55 9919370Spst#define scm_tc7_contin 61 10019370Spst#define scm_tc7_cclo 63 10119370Spst/* spare 69 71 77 79 */ 10219370Spst#define scm_tc7_subr_0 85 10319370Spst#define scm_tc7_subr_1 87 10419370Spst#define scm_tc7_cxr 93 10519370Spst#define scm_tc7_subr_3 95 10619370Spst#define scm_tc7_subr_2 101 10719370Spst#define scm_tc7_asubr 103 10819370Spst#define scm_tc7_subr_1o 109 10919370Spst#define scm_tc7_subr_2o 111 11019370Spst#define scm_tc7_lsubr_2 117 11119370Spst#define scm_tc7_lsubr 119 11219370Spst#define scm_tc7_rpsubr 125 11319370Spst 11419370Spst#define scm_tc7_smob 127 11519370Spst#define scm_tc_free_cell 127 11619370Spst 11719370Spst#define scm_tc16_flo 0x017f 11819370Spst#define scm_tc_flo 0x017fL 11919370Spst 12019370Spst#define SCM_REAL_PART (1L<<16) 12119370Spst#define SCM_IMAG_PART (2L<<16) 12219370Spst#define scm_tc_dblr (scm_tc16_flo|REAL_PART) 12319370Spst#define scm_tc_dblc (scm_tc16_flo|REAL_PART|IMAG_PART) 12419370Spst 12519370Spst#define scm_tc16_bigpos 0x027f 12619370Spst#define scm_tc16_bigneg 0x037f 12719370Spst 12819370Spst#define scm_tc16_fport (scm_tc7_port + 0*256L) 12919370Spst#define scm_tc16_pipe (scm_tc7_port + 1*256L) 13019370Spst#define scm_tc16_strport (scm_tc7_port + 2*256L) 13119370Spst#define scm_tc16_sfport (scm_tc7_port + 3*256L) 13219370Spst 13319370Spst 13419370Spst 13519370Spst/* For cons pairs with immediate values in the CAR */ 13619370Spst#define scm_tcs_cons_imcar 2:case 4:case 6:case 10:\ 13719370Spst case 12:case 14:case 18:case 20:\ 13819370Spst case 22:case 26:case 28:case 30:\ 13919370Spst case 34:case 36:case 38:case 42:\ 14019370Spst case 44:case 46:case 50:case 52:\ 14119370Spst case 54:case 58:case 60:case 62:\ 14219370Spst case 66:case 68:case 70:case 74:\ 14319370Spst case 76:case 78:case 82:case 84:\ 14419370Spst case 86:case 90:case 92:case 94:\ 14519370Spst case 98:case 100:case 102:case 106:\ 14619370Spst case 108:case 110:case 114:case 116:\ 14719370Spst case 118:case 122:case 124:case 126 14819370Spst 14919370Spst/* For cons pairs with non-immediate values in the CAR */ 15019370Spst#define scm_tcs_cons_nimcar 0:case 8:case 16:case 24:\ 15119370Spst case 32:case 40:case 48:case 56:\ 15219370Spst case 64:case 72:case 80:case 88:\ 15319370Spst case 96:case 104:case 112:case 120 15419370Spst 15519370Spst/* A CONS_GLOC occurs in code. It's CAR is a pointer to the 15619370Spst * CDR of a variable. The low order bits of the CAR are 001. 15719370Spst * The CDR of the gloc is the code continuation. 15819370Spst */ 15919370Spst#define scm_tcs_cons_gloc 1:case 9:case 17:case 25:\ 16019370Spst case 33:case 41:case 49:case 57:\ 16119370Spst case 65:case 73:case 81:case 89:\ 16219370Spst case 97:case 105:case 113:case 121 16319370Spst 16419370Spst#define scm_tcs_closures 3:case 11:case 19:case 27:\ 16519370Spst case 35:case 43:case 51:case 59:\ 16619370Spst case 67:case 75:case 83:case 91:\ 16719370Spst case 99:case 107:case 115:case 123 16819370Spst 16919370Spst#define scm_tcs_subrs scm_tc7_asubr:case scm_tc7_subr_0:case scm_tc7_subr_1:case scm_tc7_cxr:\ 17019370Spst case scm_tc7_subr_3:case scm_tc7_subr_2:case scm_tc7_rpsubr:case scm_tc7_subr_1o:\ 17119370Spst case scm_tc7_subr_2o:case scm_tc7_lsubr_2:case scm_tc7_lsubr 17219370Spst 17319370Spst#define scm_tcs_symbols scm_tc7_ssymbol:case scm_tc7_msymbol 17419370Spst 17519370Spst#define scm_tcs_bignums tc16_bigpos:case tc16_bigneg 17619370Spst 17719370Spst 17898944Sobrien 17919370Spst/* References to objects are of type SCM. Values may be non-immediate 18019370Spst * (pointers) or immediate (encoded, immutable, scalar values that fit 18119370Spst * in an SCM variable). 18219370Spst */ 18319370Spst 18419370Spsttypedef long SCM; 18519370Spst 18619370Spst/* Cray machines have pointers that are incremented once for each word, 18719370Spst * rather than each byte, the 3 most significant bits encode the byte 18819370Spst * within the word. The following macros deal with this by storing the 18919370Spst * native Cray pointers like the ones that looks like scm expects. This 19019370Spst * is done for any pointers that might appear in the car of a scm_cell, pointers 19119370Spst * to scm_vector elts, functions, &c are not munged. 19219370Spst */ 19319370Spst#ifdef _UNICOS 19498944Sobrien#define SCM2PTR(x) ((int)(x) >> 3) 19598944Sobrien#define PTR2SCM(x) (((SCM)(x)) << 3) 19698944Sobrien#define SCM_POINTERS_MUNGED 19719370Spst#else 19898944Sobrien#define SCM2PTR(x) (x) 19998944Sobrien#define PTR2SCM(x) ((SCM)(x)) 20019370Spst#endif /* def _UNICOS */ 20119370Spst 20219370Spst 20398944Sobrien 20419370Spst/* Immediate? Predicates 20519370Spst */ 20619370Spst#define SCM_IMP(x) (6 & (int)(x)) 20719370Spst#define SCM_NIMP(x) (!SCM_IMP(x)) 20819370Spst 20919370Spst 21098944Sobrien 21119370Spstenum scm_tags 21298944Sobrien { 21398944Sobrien scm_tc8_char = 0xf4 21498944Sobrien }; 21519370Spst 21619370Spst#define SCM_ITAG8(X) ((int)(X) & 0xff) 21719370Spst#define SCM_MAKE_ITAG8(X, TAG) (((X)<<8) + TAG) 21819370Spst#define SCM_ITAG8_DATA(X) ((X)>>8) 21998944Sobrien 22019370Spst 22119370Spst 22219370Spst/* Local Environment Structure 22319370Spst */ 22419370Spst#define SCM_ILOCP(n) ((0xff & (int)(n))==0xfc) 22519370Spst#define SCM_ILOC00 (0x000000fcL) 22619370Spst#define SCM_IDINC (0x00100000L) 22719370Spst#define SCM_ICDR (0x00080000L) 22819370Spst#define SCM_IFRINC (0x00000100L) 22919370Spst#define SCM_IDSTMSK (-SCM_IDINC) 23019370Spst#define SCM_IFRAME(n) ((int)((SCM_ICDR-SCM_IFRINC)>>8) & ((int)(n)>>8)) 23119370Spst#define SCM_IDIST(n) (((unsigned long)(n))>>20) 23219370Spst#define SCM_ICDRP(n) (SCM_ICDR & (n)) 23398944Sobrien 23419370Spst 23519370Spst/* Immediate Symbols, Special Symbols, Flags (various constants). 23619370Spst */ 23719370Spst 23819370Spst/* ISYMP tests for ISPCSYM and ISYM */ 23919370Spst#define SCM_ISYMP(n) ((0x187 & (int)(n))==4) 24019370Spst 24119370Spst/* IFLAGP tests for ISPCSYM, ISYM and IFLAG */ 24219370Spst#define SCM_IFLAGP(n) ((0x87 & (int)(n))==4) 24319370Spst#define SCM_ISYMNUM(n) ((int)((n)>>9)) 24419370Spst#define SCM_ISYMCHARS(n) (scm_isymnames[SCM_ISYMNUM(n)]) 24519370Spst#define SCM_MAKSPCSYM(n) (((n)<<9)+((n)<<3)+4L) 24619370Spst#define SCM_MAKISYM(n) (((n)<<9)+0x74L) 24719370Spst#define SCM_MAKIFLAG(n) (((n)<<9)+0x174L) 24819370Spst 24919370Spst/* This table must agree with the declarations 25019370Spst * in repl.c: {Names of immediate symbols}. 25119370Spst * 25219370Spst * These are used only in eval but their values 25319370Spst * have to be allocated here. 25419370Spst * 25519370Spst */ 25619370Spst 25719370Spst#define SCM_IM_AND SCM_MAKSPCSYM(0) 25819370Spst#define SCM_IM_BEGIN SCM_MAKSPCSYM(1) 25919370Spst#define SCM_IM_CASE SCM_MAKSPCSYM(2) 26019370Spst#define SCM_IM_COND SCM_MAKSPCSYM(3) 26119370Spst#define SCM_IM_DO SCM_MAKSPCSYM(4) 26219370Spst#define SCM_IM_IF SCM_MAKSPCSYM(5) 26319370Spst#define SCM_IM_LAMBDA SCM_MAKSPCSYM(6) 26419370Spst#define SCM_IM_LET SCM_MAKSPCSYM(7) 26519370Spst#define SCM_IM_LETSTAR SCM_MAKSPCSYM(8) 26619370Spst#define SCM_IM_LETREC SCM_MAKSPCSYM(9) 26719370Spst#define SCM_IM_OR SCM_MAKSPCSYM(10) 26819370Spst#define SCM_IM_QUOTE SCM_MAKSPCSYM(11) 26919370Spst#define SCM_IM_SET SCM_MAKSPCSYM(12) 27019370Spst#define SCM_IM_DEFINE SCM_MAKSPCSYM(13) 27119370Spst#define SCM_IM_APPLY SCM_MAKISYM(14) 27219370Spst#define SCM_IM_CONT SCM_MAKISYM(15) 27319370Spst#define SCM_NUM_ISYMS 16 27419370Spst 27519370Spst/* Important immediates 27619370Spst */ 27719370Spst 27819370Spst#define SCM_BOOL_F SCM_MAKIFLAG(SCM_NUM_ISYMS+0) 27919370Spst#define SCM_BOOL_T SCM_MAKIFLAG(SCM_NUM_ISYMS+1) 28019370Spst#define SCM_UNDEFINED SCM_MAKIFLAG(SCM_NUM_ISYMS+2) 28119370Spst#define SCM_EOF_VAL SCM_MAKIFLAG(SCM_NUM_ISYMS+3) 28219370Spst 28319370Spst#ifdef SICP 28419370Spst#define SCM_EOL SCM_BOOL_F 28519370Spst#else 28619370Spst#define SCM_EOL SCM_MAKIFLAG(SCM_NUM_ISYMS+4) 28719370Spst#endif 28819370Spst 28919370Spst#define SCM_UNSPECIFIED SCM_MAKIFLAG(SCM_NUM_ISYMS+5) 29019370Spst 29119370Spst 29298944Sobrien 29319370Spst/* Heap Pairs and the Empty List Predicates 29419370Spst */ 29519370Spst#define SCM_NULLP(x) (SCM_EOL == (x)) 29619370Spst#define SCM_NNULLP(x) (SCM_EOL != (x)) 29719370Spst#define SCM_CELLP(x) (!SCM_NCELLP(x)) 29819370Spst#define SCM_NCELLP(x) ((sizeof(scm_cell)-1) & (int)(x)) 29998944Sobrien 30019370Spst 30119370Spst 30219370Spst#define SCM_UNBNDP(x) (SCM_UNDEFINED==(x)) 30319370Spst 30419370Spst 30598944Sobrien 30619370Spst/* Testing and Changing GC Marks in Various Standard Positions 30719370Spst */ 30819370Spst#define SCM_GCMARKP(x) (1 & (int)SCM_CDR(x)) 30919370Spst#define SCM_GC8MARKP(x) (0x80 & (int)SCM_CAR(x)) 31019370Spst#define SCM_SETGCMARK(x) (SCM_CDR(x) |= 1) 31119370Spst#define SCM_CLRGCMARK(x) (SCM_CDR(x) &= ~1L) 31219370Spst#define SCM_SETGC8MARK(x) (SCM_CAR(x) |= 0x80) 31319370Spst#define SCM_CLRGC8MARK(x) (SCM_CAR(x) &= ~0x80L) 31498944Sobrien 31519370Spst 31619370Spst/* Extracting Tag Bits, With or Without GC Safety and Optional Bits 31719370Spst */ 31819370Spst#define SCM_TYP3(x) (7 & (int)SCM_CAR(x)) 31919370Spst#define SCM_TYP7(x) (0x7f & (int)SCM_CAR(x)) 32019370Spst#define SCM_TYP7S(x) (0x7d & (int)SCM_CAR(x)) 32119370Spst#define SCM_TYP16(x) (0xffff & (int)SCM_CAR(x)) 32219370Spst#define SCM_TYP16S(x) (0xfeff & (int)SCM_CAR(x)) 32319370Spst#define SCM_GCTYP16(x) (0xff7f & (int)SCM_CAR(x)) 32498944Sobrien 32519370Spst 32619370Spst/* Two slightly extensible types: smobs and ptobs. 32798944Sobrien 32819370Spst */ 32919370Spst#define SCM_SMOBNUM(x) (0x0ff & (CAR(x)>>8)); 33019370Spst#define SCM_PTOBNUM(x) (0x0ff & (CAR(x)>>8)); 33198944Sobrien 33219370Spst 33319370Spst 33419370Spst 33519370Spst#define SCM_DIRP(x) (SCM_NIMP(x) && (TYP16(x)==(scm_tc16_dir))) 33619370Spst#define SCM_OPDIRP(x) (SCM_NIMP(x) && (CAR(x)==(scm_tc16_dir | OPN))) 33719370Spst 33819370Spst 33998944Sobrien 34019370Spst/* Lvectors 34119370Spst */ 34219370Spst#define SCM_LVECTORP(x) (TYP7(x)==tc7_lvector) 34398944Sobrien 34419370Spst 34519370Spst#if 0 34619370Spst 34719370Spst/* Sockets 34819370Spst */ 34919370Spst#define tc_socket (tc7_port | OPN) 35019370Spst#define SCM_SOCKP(x) (((0x7f | OPN | RDNG | WRTNG) & CAR(x))==(tc_socket)) 35119370Spst#define SCM_SOCKTYP(x) (CAR(x)>>24) 35219370Spst 35319370Spst 35498944Sobrien 35519370Spstextern int scm_tc16_key_vector; 35619370Spst#define SCM_KEYVECP(X) (scm_tc16_key_vector == TYP16 (X)) 35719370Spst#define SCM_KEYVECLEN(OBJ) (((unsigned long)CAR (obj)) >> 16) 35898944Sobrien 35919370Spst 36019370Spst#define SCM_MALLOCDATA(obj) ((char *)CDR(obj)) 36119370Spst#define SCM_MALLOCLEN(obj) (((unsigned long)CAR (obj)) >> 16) 36219370Spst#define SCM_WORDDATA(obj) (CDR (obj)) 36319370Spst 36419370Spst 36519370Spst#define SCM_BYTECODEP(X) ((TYP7 (X) == tc7_cclo) && (CCLO_SUBR (X) == rb_proc)) 36619370Spst#define SCM_BYTECODE_CONSTANTS(X) (VELTS(X)[1]) 36719370Spst#define SCM_BYTECODE_CODE(X) (VELTS(X)[2]) 36819370Spst#define SCM_BYTECODE_NAME(X) (VELTS(X)[3]) 36919370Spst#define SCM_BYTECODE_BCODE(X) (VELTS(X)[4]) 37019370Spst#define SCM_BYTECODE_ELTS 5 37198944Sobrien 37219370Spst 37319370Spst#define SCM_FREEP(x) (CAR(x)==tc_free_cell) 37419370Spst#define SCM_NFREEP(x) (!FREEP(x)) 37519370Spst 37698944Sobrien#endif /* 0 */ 37719370Spst 37819370Spst 37998944Sobrien#endif /* TAGSH */ 380