/* 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 */