Objects/funcobject.c

   1 /***********************************************************
   2 Copyright 1991, 1992, 1993, 1994 by Stichting Mathematisch Centrum,
   3 Amsterdam, The Netherlands.
   4
   5                         All Rights Reserved
   6
   7 Permission to use, copy, modify, and distribute this software and its
   8 documentation for any purpose and without fee is hereby granted,
   9 provided that the above copyright notice appear in all copies and that
  10 both that copyright notice and this permission notice appear in
  11 supporting documentation, and that the names of Stichting Mathematisch
  12 Centrum or CWI not be used in advertising or publicity pertaining to
  13 distribution of the software without specific, written prior permission.
  14
  15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
  16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
  18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22
  23 ******************************************************************/
  24
  25 /* Function object implementation */
  26
  27 #include "allobjects.h"
  28 #include "compile.h"
  29 #include "structmember.h"
  30
  31 object *
  32 newfuncobject(code, globals)
  33         object *code;
  34         object *globals;
  35 {
  36         funcobject *op = NEWOBJ(funcobject, &Functype);
  37         if (op != NULL) {
  38                 INCREF(code);
  39                 op->func_code = code;
  40                 INCREF(globals);
  41                 op->func_globals = globals;
  42                 op->func_name = ((codeobject*)(op->func_code))->co_name;
  43                 INCREF(op->func_name);
  44         }
  45         return (object *)op;
  46 }
  47
  48 object *
  49 getfunccode(op)
  50         object *op;
  51 {
  52         if (!is_funcobject(op)) {
  53                 err_badcall();
  54                 return NULL;
  55         }
  56         return ((funcobject *) op) -> func_code;
  57 }
  58
  59 object *
  60 getfuncglobals(op)
  61         object *op;
  62 {
  63         if (!is_funcobject(op)) {
  64                 err_badcall();
  65                 return NULL;
  66         }
  67         return ((funcobject *) op) -> func_globals;
  68 }
  69
  70 /* Methods */
  71
  72 #define OFF(x) offsetof(funcobject, x)
  73
  74 static struct memberlist func_memberlist[] = {
  75         {"func_code",   T_OBJECT,       OFF(func_code),         READONLY},
  76         {"func_globals",T_OBJECT,       OFF(func_globals),      READONLY},
  77         {"func_name",   T_OBJECT,       OFF(func_name),         READONLY},
  78         {NULL}  /* Sentinel */
  79 };
  80
  81 static object *
  82 func_getattr(op, name)
  83         funcobject *op;
  84         char *name;
  85 {
  86         return getmember((char *)op, func_memberlist, name);
  87 }
  88
  89 static void
  90 func_dealloc(op)
  91         funcobject *op;
  92 {
  93         DECREF(op->func_code);
  94         DECREF(op->func_globals);
  95         DEL(op);
  96 }
  97
  98 static object*
  99 func_repr(op)
 100         funcobject *op;
 101 {
 102         char buf[140];
 103         if (op->func_name == None)
 104                 sprintf(buf, "<anonymous function at %lx>", (long)op);
 105         else
 106                 sprintf(buf, "<function %.100s at %lx>",
 107                         getstringvalue(op->func_name),
 108                         (long)op);
 109         return newstringobject(buf);
 110 }
 111
 112 static int
 113 func_compare(f, g)
 114         funcobject *f, *g;
 115 {
 116         if (f->func_globals != g->func_globals)
 117                 return (f->func_globals < g->func_globals) ? -1 : 1;
 118         return cmpobject(f->func_code, g->func_code);
 119 }
 120
 121 static long
 122 func_hash(f)
 123         funcobject *f;
 124 {
 125         long h;
 126         h = hashobject(f->func_code);
 127         if (h == -1) return h;
 128         h = h ^ (long)f->func_globals;
 129         if (h == -1) h = -2;
 130         return h;
 131 }
 132
 133 typeobject Functype = {
 134         OB_HEAD_INIT(&Typetype)
 135         0,
 136         "function",
 137         sizeof(funcobject),
 138         0,
 139         (destructor)func_dealloc, /*tp_dealloc*/
 140         0,              /*tp_print*/
 141         (getattrfunc)func_getattr, /*tp_getattr*/
 142         0,              /*tp_setattr*/
 143         (cmpfunc)func_compare, /*tp_compare*/
 144         (reprfunc)func_repr, /*tp_repr*/
 145         0,              /*tp_as_number*/
 146         0,              /*tp_as_sequence*/
 147         0,              /*tp_as_mapping*/
 148         (hashfunc)func_hash, /*tp_hash*/
 149 };