libguile/eval.h

   1 /* classes: h_files */
   2
   3 #ifndef EVALH
   4 #define EVALH
   5 /*      Copyright (C) 1995, 1996 ,1998, 1999 Free Software Foundation, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307 USA
  21  *
  22  * As a special exception, the Free Software Foundation gives permission
  23  * for additional uses of the text contained in its release of GUILE.
  24  *
  25  * The exception is that, if you link the GUILE library with other files
  26  * to produce an executable, this does not by itself cause the
  27  * resulting executable to be covered by the GNU General Public License.
  28  * Your use of that executable is in no way restricted on account of
  29  * linking the GUILE library code into it.
  30  *
  31  * This exception does not however invalidate any other reasons why
  32  * the executable file might be covered by the GNU General Public License.
  33  *
  34  * This exception applies only to the code released by the
  35  * Free Software Foundation under the name GUILE.  If you copy
  36  * code from other Free Software Foundation releases into a copy of
  37  * GUILE, as the General Public License permits, the exception does
  38  * not apply to the code that you add in this way.  To avoid misleading
  39  * anyone as to the status of such modified files, you must delete
  40  * this exception notice from them.
  41  *
  42  * If you write modifications of your own for GUILE, it is your choice
  43  * whether to permit this exception to apply to your modifications.
  44  * If you do not wish that, delete this exception notice.  */
  45 \f
  46
  47 #include "libguile/__scm.h"
  48
  49 \f
  50
  51 /* {Options}
  52  */
  53
  54 extern scm_option scm_eval_opts[];
  55
  56 #define SCM_EVAL_STACK         scm_eval_opts[0].val
  57 #define SCM_N_EVAL_OPTIONS 1
  58
  59 extern int scm_eval_stack;
  60
  61 extern scm_option scm_evaluator_trap_table[];
  62
  63 extern SCM scm_eval_options_interface SCM_P ((SCM setting));
  64
  65 #define SCM_TRAPS_P            scm_evaluator_trap_table[0].val
  66 #define SCM_ENTER_FRAME_P      scm_evaluator_trap_table[1].val
  67 #define SCM_APPLY_FRAME_P      scm_evaluator_trap_table[2].val
  68 #define SCM_EXIT_FRAME_P       scm_evaluator_trap_table[3].val
  69 #define SCM_N_EVALUATOR_TRAPS 4
  70
  71 \f
  72
  73 /* {Ilocs}
  74  *
  75  * Ilocs are relative pointers into local environment structures.
  76  *
  77  */
  78 #define SCM_ILOCP(n)            (SCM_ITAG8(n)==scm_tc8_iloc)
  79 #define SCM_ILOC00              SCM_MAKE_ITAG8(0L, scm_tc8_iloc)
  80 #define SCM_IDINC               (0x00100000L)
  81 #define SCM_ICDR                (0x00080000L)
  82 #define SCM_IFRINC              (0x00000100L)
  83 #define SCM_IDSTMSK             (-SCM_IDINC)
  84 #define SCM_IFRAME(n)           ((int)((SCM_ICDR-SCM_IFRINC)>>8) & ((int)(n)>>8))
  85 #define SCM_IDIST(n)            (((unsigned long)(n))>>20)
  86 #define SCM_ICDRP(n)            (SCM_ICDR & (n))
  87
  88 \f
  89
  90
  91 /* {Evaluator}
  92  *
  93  * For an explanation of symbols containing "EVAL", see beginning of eval.c.
  94  */
  95 #ifdef MEMOIZE_LOCALS
  96 #define SCM_EVALIM(x, env) (SCM_ILOCP (x) ? *scm_ilookup ((x), env) : x)
  97 #else
  98 #define SCM_EVALIM(x, env) x
  99 #endif
 100 #ifdef DEBUG_EXTENSIONS
 101 #define SCM_XEVAL(x, env) (SCM_IMP (x) \
 102                            ? (x) \
 103                            : (*scm_ceval_ptr) ((x), (env)))
 104 #define SCM_XEVALCAR(x, env) (SCM_NCELLP (SCM_CAR (x)) \
 105                               ? (SCM_IMP (SCM_CAR (x)) \
 106                                  ? SCM_EVALIM (SCM_CAR (x), env) \
 107                                  : SCM_GLOC_VAL (SCM_CAR (x))) \
 108                               : (SCM_SYMBOLP (SCM_CAR (x)) \
 109                                  ? *scm_lookupcar (x, env, 1) \
 110                                  : (*scm_ceval_ptr) (SCM_CAR (x), env)))
 111 #else
 112 #define SCM_XEVAL(x, env) (SCM_IMP (x) ? (x) : scm_ceval ((x), (env)))
 113 #define SCM_XEVALCAR(x, env) EVALCAR (x, env)
 114 #endif /* DEBUG_EXTENSIONS */
 115
 116 \f
 117
 118 #define SCM_EXTEND_ENV scm_acons
 119
 120 \f
 121 extern const char scm_s_expression[];
 122 extern const char scm_s_test[];
 123 extern const char scm_s_body[];
 124 extern const char scm_s_bindings[];
 125 extern const char scm_s_variable[];
 126 extern const char scm_s_clauses[];
 127 extern const char scm_s_formals[];
 128 extern const char scm_s_set_x[];
 129
 130 extern SCM scm_sym_and;
 131 extern SCM scm_sym_begin;
 132 extern SCM scm_sym_case;
 133 extern SCM scm_sym_cond;
 134 extern SCM scm_sym_define;
 135 extern SCM scm_sym_do;
 136 extern SCM scm_sym_if;
 137 extern SCM scm_sym_lambda;
 138 extern SCM scm_sym_let;
 139 extern SCM scm_sym_letstar;
 140 extern SCM scm_sym_letrec;
 141 extern SCM scm_sym_quote;
 142 extern SCM scm_sym_quasiquote;
 143 extern SCM scm_sym_unquote;
 144 extern SCM scm_sym_uq_splicing;
 145
 146 extern SCM scm_sym_dot;
 147 extern SCM scm_sym_atapply;
 148 extern SCM scm_sym_atcall_cc;
 149 extern SCM scm_sym_delay;
 150 extern SCM scm_sym_arrow;
 151 extern SCM scm_sym_else;
 152 extern SCM scm_sym_apply;
 153 extern SCM scm_sym_set_x;
 154 extern SCM scm_sym_args;
 155
 156 extern SCM scm_f_apply;
 157
 158 extern long scm_tc16_macro;
 159
 160 /* A resolved global variable reference in the CAR position
 161  * of a list is stored (in code only) as a pointer to a pair with a
 162  * tag of 1.  This is called a "gloc".
 163  */
 164
 165 #define SCM_GLOC_SYM(x) (SCM_CAR((x)-1L))
 166 #define SCM_GLOC_VAL(x) (SCM_CDR((x)-1L))
 167 #define SCM_GLOC_VAL_LOC(x) (SCM_CDRLOC((x)-1L))
 168
 169 \f
 170
 171 extern SCM * scm_ilookup SCM_P ((SCM iloc, SCM env));
 172 extern SCM * scm_lookupcar SCM_P ((SCM vloc, SCM genv, int check));
 173 extern SCM scm_unmemocar SCM_P ((SCM form, SCM env));
 174 extern SCM scm_unmemocopy SCM_P ((SCM form, SCM env));
 175 extern SCM scm_eval_car SCM_P ((SCM pair, SCM env));
 176 extern SCM scm_eval_body (SCM code, SCM env);
 177 extern SCM scm_eval_args SCM_P ((SCM i, SCM env, SCM proc));
 178 extern SCM scm_deval_args SCM_P ((SCM l, SCM env, SCM proc, SCM *lloc));
 179 extern SCM scm_m_quote SCM_P ((SCM xorig, SCM env));
 180 extern SCM scm_m_begin SCM_P ((SCM xorig, SCM env));
 181 extern SCM scm_m_if SCM_P ((SCM xorig, SCM env));
 182 extern SCM scm_m_set_x SCM_P ((SCM xorig, SCM env));
 183 extern SCM scm_m_vref SCM_P ((SCM xorig, SCM env));
 184 extern SCM scm_m_vset SCM_P ((SCM xorig, SCM env));
 185 extern SCM scm_m_and SCM_P ((SCM xorig, SCM env));
 186 extern SCM scm_m_or SCM_P ((SCM xorig, SCM env));
 187 extern SCM scm_m_case SCM_P ((SCM xorig, SCM env));
 188 extern SCM scm_m_cond SCM_P ((SCM xorig, SCM env));
 189 extern SCM scm_m_lambda SCM_P ((SCM xorig, SCM env));
 190 extern SCM scm_m_letstar SCM_P ((SCM xorig, SCM env));
 191 extern SCM scm_m_do SCM_P ((SCM xorig, SCM env));
 192 extern SCM scm_m_quasiquote SCM_P ((SCM xorig, SCM env));
 193 extern SCM scm_m_delay SCM_P ((SCM xorig, SCM env));
 194 extern SCM scm_m_define SCM_P ((SCM x, SCM env));
 195 extern SCM scm_m_letrec SCM_P ((SCM xorig, SCM env));
 196 extern SCM scm_m_let SCM_P ((SCM xorig, SCM env));
 197 extern SCM scm_m_apply SCM_P ((SCM xorig, SCM env));
 198 extern SCM scm_m_cont SCM_P ((SCM xorig, SCM env));
 199 extern SCM scm_m_nil_cond (SCM xorig, SCM env);
 200 extern SCM scm_m_nil_ify (SCM xorig, SCM env);
 201 extern SCM scm_m_t_ify (SCM xorig, SCM env);
 202 extern SCM scm_m_0_cond (SCM xorig, SCM env);
 203 extern SCM scm_m_0_ify (SCM xorig, SCM env);
 204 extern SCM scm_m_1_ify (SCM xorig, SCM env);
 205 extern SCM scm_m_atfop (SCM xorig, SCM env);
 206 extern SCM scm_m_atbind (SCM xorig, SCM env);
 207 extern int scm_badargsp SCM_P ((SCM formals, SCM args));
 208 extern SCM scm_ceval SCM_P ((SCM x, SCM env));
 209 extern SCM scm_deval SCM_P ((SCM x, SCM env));
 210 extern SCM scm_nconc2last SCM_P ((SCM lst));
 211 extern SCM scm_apply SCM_P ((SCM proc, SCM arg1, SCM args));
 212 extern SCM scm_dapply SCM_P ((SCM proc, SCM arg1, SCM args));
 213 extern SCM scm_m_expand_body SCM_P ((SCM xorig, SCM env));
 214 extern SCM scm_macroexp SCM_P ((SCM x, SCM env));
 215 extern SCM scm_map SCM_P ((SCM proc, SCM arg1, SCM args));
 216 extern SCM scm_for_each SCM_P ((SCM proc, SCM arg1, SCM args));
 217 extern SCM scm_closure SCM_P ((SCM code, SCM env));
 218 extern SCM scm_makprom SCM_P ((SCM code));
 219 extern SCM scm_force SCM_P ((SCM x));
 220 extern SCM scm_promise_p SCM_P ((SCM x));
 221 extern SCM scm_cons_source (SCM xorig, SCM x, SCM y);
 222 extern SCM scm_copy_tree SCM_P ((SCM obj));
 223 extern SCM scm_eval_3 SCM_P ((SCM obj, int copyp, SCM env));
 224 extern SCM scm_eval2 SCM_P ((SCM obj, SCM env_thunk));
 225 extern SCM scm_eval SCM_P ((SCM obj));
 226 extern SCM scm_eval_x SCM_P ((SCM obj));
 227 extern void scm_init_eval SCM_P ((void));
 228
 229 #endif  /* EVALH */