libguile/root.h

   1 /* classes: h_files */
   2
   3 #ifndef ROOTH
   4 #define ROOTH
   5
   6 /*      Copyright (C) 1996 Free Software Foundation, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this software; see the file COPYING.  If not, write to
  20  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 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  */
  46 \f
  47
  48 \f
  49
  50 #include "libguile/__scm.h"
  51 #include "libguile/debug.h"
  52
  53 \f
  54
  55 #define scm_flo0 scm_sys_protects[0]
  56 #define scm_listofnull scm_sys_protects[1]
  57 #define scm_undefineds scm_sys_protects[2]
  58 #define scm_nullvect scm_sys_protects[3]
  59 #define scm_nullstr scm_sys_protects[4]
  60 #define scm_symhash scm_sys_protects[5]
  61 #define scm_weak_symhash scm_sys_protects[6]
  62 #define scm_symhash_vars scm_sys_protects[7]
  63 #define scm_kw_obarray scm_sys_protects[8]
  64 #define scm_type_obj_list scm_sys_protects[9]
  65 #define scm_first_type scm_sys_protects[10]
  66 #define scm_stand_in_procs scm_sys_protects[11]
  67 #define scm_object_whash scm_sys_protects[12]
  68 #define scm_permobjs scm_sys_protects[13]
  69 #define scm_asyncs scm_sys_protects[14]
  70 #define scm_protects scm_sys_protects[15]
  71 #ifdef DEBUG_EXTENSIONS
  72 #define scm_source_whash scm_sys_protects[16]
  73 #define SCM_NUM_PROTECTS 17
  74 #else
  75 #define SCM_NUM_PROTECTS 16
  76 #endif
  77
  78 extern SCM scm_sys_protects[];
  79
  80 \f
  81
  82 extern long scm_tc16_root;
  83
  84 #define SCM_ROOTP(obj) (scm_tc16_root == SCM_TYP16 (obj))
  85 #define SCM_ROOT_STATE(root) ((scm_root_state *) SCM_CDR (root))
  86
  87 typedef struct scm_root_state
  88 {
  89   SCM_STACKITEM * stack_base;
  90   jmp_buf save_regs_gc_mark;
  91   int errjmp_bad;
  92
  93   SCM rootcont;
  94   SCM dynwinds;
  95   SCM continuation_stack;
  96   SCM continuation_stack_ptr;
  97 #ifdef DEBUG_EXTENSIONS
  98   /* It is very inefficient to have this variable in the root state. */
  99   scm_debug_frame *last_debug_frame;
 100 #endif
 101
 102   SCM progargs;                 /* vestigial */
 103   SCM exitval;                  /* vestigial */
 104
 105   SCM cur_inp;
 106   SCM cur_outp;
 107   SCM cur_errp;
 108   SCM def_inp;
 109   SCM def_outp;
 110   SCM def_errp;
 111
 112   SCM system_transformer;
 113   SCM top_level_lookup_closure_var;
 114
 115   SCM handle;                   /* The root object for this root state */
 116   SCM parent;                   /* The parent root object */
 117 } scm_root_state;
 118
 119 #define scm_stack_base                  (scm_root->stack_base)
 120 #define scm_save_regs_gc_mark           (scm_root->save_regs_gc_mark)
 121 #define scm_errjmp_bad                  (scm_root->errjmp_bad)
 122
 123 #define scm_rootcont                    (scm_root->rootcont)
 124 #define scm_dynwinds                    (scm_root->dynwinds)
 125 #define scm_continuation_stack          (scm_root->continuation_stack)
 126 #define scm_continuation_stack_ptr      (scm_root->continuation_stack_ptr)
 127 #define scm_progargs                    (scm_root->progargs)
 128 #ifdef USE_THREADS
 129 #define scm_last_debug_frame            (scm_root->last_debug_frame)
 130 #endif
 131 #define scm_exitval                     (scm_root->exitval)
 132 #define scm_cur_inp                     (scm_root->cur_inp)
 133 #define scm_cur_outp                    (scm_root->cur_outp)
 134 #define scm_cur_errp                    (scm_root->cur_errp)
 135 #define scm_def_inp                     (scm_root->def_inp)
 136 #define scm_def_outp                    (scm_root->def_outp)
 137 #define scm_def_errp                    (scm_root->def_errp)
 138 #define scm_top_level_lookup_closure_var \
 139                                        (scm_root->top_level_lookup_closure_var)
 140 #define scm_system_transformer          (scm_root->system_transformer)
 141
 142 #ifdef USE_THREADS
 143 #define scm_root ((scm_root_state *) SCM_THREAD_LOCAL_DATA)
 144 #define scm_set_root(new_root) SCM_SET_THREAD_LOCAL_DATA (new_root)
 145 #else /* USE_THREADS */
 146 extern struct scm_root_state *scm_root;
 147 #define scm_set_root(new_root) (scm_root = (new_root))
 148 #endif /* USE_THREADS */
 149
 150 \f
 151
 152 extern SCM scm_make_root SCM_P ((SCM parent));
 153 extern SCM scm_call_with_dynamic_root SCM_P ((SCM thunk, SCM handler));
 154 extern SCM scm_apply_with_dynamic_root SCM_P ((SCM proc, SCM a1, SCM args, SCM handler));
 155 extern SCM scm_call_catching_errors SCM_P ((SCM (*thunk)(), SCM (*err_filter)(), void * closure));
 156 extern void scm_init_root SCM_P ((void));
 157
 158 #endif  /* ROOTH */