src/scheme-private.h

   1 /* scheme-private.h */
   2
   3 #ifndef _SCHEME_PRIVATE_H
   4 #define _SCHEME_PRIVATE_H
   5
   6 #include "scheme.h"
   7 /*------------------ Ugly internals -----------------------------------*/
   8 /*------------------ Of interest only to FFI users --------------------*/
   9
  10
  11 enum scheme_port_kind {
  12   port_free=0,
  13   port_file=1,
  14   port_string=2,
  15   port_input=16,
  16   port_output=32
  17 };
  18
  19 typedef struct port {
  20   unsigned char kind;
  21   union {
  22     struct {
  23       FILE *file;
  24       int closeit;
  25     } stdio;
  26     struct {
  27       char *start;
  28       char *past_the_end;
  29       char *curr;
  30     } string;
  31   } rep;
  32 } port;
  33
  34 /* cell structure */
  35 struct cell {
  36   unsigned int _flag;
  37   union {
  38     struct {
  39       char   *_svalue;
  40       int   _length;
  41     } _string;
  42     num _number;
  43     port *_port;
  44     foreign_func _ff;
  45     struct {
  46       struct cell *_car;
  47       struct cell *_cdr;
  48     } _cons;
  49   } _object;
  50 };
  51
  52 struct scheme {
  53 /* arrays for segments */
  54 func_alloc malloc;
  55 func_dealloc free;
  56
  57 /* return code */
  58 int retcode;
  59 int tracing;
  60
  61 #define CELL_SEGSIZE    5000  /* # of cells in one segment */
  62 #define CELL_NSEGMENT   10    /* # of segments for cells */
  63 char *alloc_seg[CELL_NSEGMENT];
  64 pointer cell_seg[CELL_NSEGMENT];
  65 int     last_cell_seg;
  66
  67 /* We use 4 registers. */
  68 pointer args;            /* register for arguments of function */
  69 pointer envir;           /* stack register for current environment */
  70 pointer code;            /* register for current code */
  71 pointer dump;            /* stack register for next evaluation */
  72
  73 int interactive_repl;    /* are we in an interactive REPL? */
  74
  75 struct cell _sink;
  76 pointer sink;            /* when mem. alloc. fails */
  77 struct cell _NIL;
  78 pointer NIL;             /* special cell representing empty cell */
  79 struct cell _HASHT;
  80 pointer T;               /* special cell representing #t */
  81 struct cell _HASHF;
  82 pointer F;               /* special cell representing #f */
  83 struct cell _EOF_OBJ;
  84 pointer EOF_OBJ;         /* special cell representing end-of-file object */
  85 pointer oblist;          /* pointer to symbol table */
  86 pointer global_env;      /* pointer to global environment */
  87
  88 /* global pointers to special symbols */
  89 pointer LAMBDA;               /* pointer to syntax lambda */
  90 pointer QUOTE;           /* pointer to syntax quote */
  91
  92 pointer QQUOTE;               /* pointer to symbol quasiquote */
  93 pointer UNQUOTE;         /* pointer to symbol unquote */
  94 pointer UNQUOTESP;       /* pointer to symbol unquote-splicing */
  95 pointer FEED_TO;         /* => */
  96 pointer COLON_HOOK;      /* *colon-hook* */
  97 pointer ERROR_HOOK;      /* *error-hook* */
  98 pointer SHARP_HOOK;  /* *sharp-hook* */
  99
 100 pointer free_cell;       /* pointer to top of free cells */
 101 long    fcells;          /* # of free cells */
 102
 103 pointer inport;
 104 pointer outport;
 105 pointer save_inport;
 106 pointer loadport;
 107
 108 #define MAXFIL 64
 109 port load_stack[MAXFIL];     /* Stack of open files for port -1 (LOADing) */
 110 int nesting_stack[MAXFIL];
 111 int file_i;
 112 int nesting;
 113
 114 char    gc_verbose;      /* if gc_verbose is not zero, print gc status */
 115 char    no_memory;       /* Whether mem. alloc. has failed */
 116
 117 #define LINESIZE 1024
 118 char    linebuff[LINESIZE];
 119 char    strbuff[256];
 120
 121 FILE *tmpfp;
 122 int tok;
 123 int print_flag;
 124 pointer value;
 125 int op;
 126
 127 void *ext_data;     /* For the benefit of foreign functions */
 128 long gensym_cnt;
 129
 130 struct scheme_interface *vptr;
 131 void *dump_base;         /* pointer to base of allocated dump stack */
 132 int dump_size;           /* number of frames allocated for dump stack */
 133 };
 134
 135 /* operator code */
 136 enum scheme_opcodes {
 137 #define _OP_DEF(A,B,C,D,E,OP) OP,
 138 #include "opdefines.h"
 139   OP_MAXDEFINED
 140 };
 141
 142
 143 #define cons(sc,a,b) _cons(sc,a,b,0)
 144 #define immutable_cons(sc,a,b) _cons(sc,a,b,1)
 145
 146 int is_string(pointer p);
 147 char *string_value(pointer p);
 148 int is_number(pointer p);
 149 num nvalue(pointer p);
 150 long ivalue(pointer p);
 151 double rvalue(pointer p);
 152 int is_integer(pointer p);
 153 int is_real(pointer p);
 154 int is_character(pointer p);
 155 long charvalue(pointer p);
 156 int is_vector(pointer p);
 157
 158 int is_port(pointer p);
 159
 160 int is_pair(pointer p);
 161 pointer pair_car(pointer p);
 162 pointer pair_cdr(pointer p);
 163 pointer set_car(pointer p, pointer q);
 164 pointer set_cdr(pointer p, pointer q);
 165
 166 int is_symbol(pointer p);
 167 char *symname(pointer p);
 168 int hasprop(pointer p);
 169
 170 int is_syntax(pointer p);
 171 int is_proc(pointer p);
 172 int is_foreign(pointer p);
 173 char *syntaxname(pointer p);
 174 int is_closure(pointer p);
 175 #ifdef USE_MACRO
 176 int is_macro(pointer p);
 177 #endif
 178 pointer closure_code(pointer p);
 179 pointer closure_env(pointer p);
 180
 181 int is_continuation(pointer p);
 182 int is_promise(pointer p);
 183 int is_environment(pointer p);
 184 int is_immutable(pointer p);
 185 void setimmutable(pointer p);
 186
 187 #endif