codea/symtable.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include "symtable.h"
   5
   6 #if 1
   7 #define DD
   8 #endif
   9
  10 struct symbol *tab_new(void)
  11 {
  12         return SYMNULL;
  13 }
  14
  15 struct symbol *tab_clone(struct symbol *tab)
  16 {
  17         struct symbol *elm = tab;
  18         struct symbol *ntab = tab_new();
  19 #ifdef DD
  20         fprintf(stderr, "tab_clone: tab(%08X)\n", tab);
  21 #endif
  22
  23         while(elm != SYMNULL) {
  24                 ntab = tab_add_symbol(ntab, elm->ident, elm->type, 0, elm->param_index ? elm->param_index : 0);
  25                 elm = elm->next;
  26         }
  27         return ntab;
  28 }
  29
  30 struct symbol *tab_add_symbol(struct symbol *tab, char *ident, short type, short check, int param_index)
  31 {
  32         struct symbol *elm = tab;
  33         struct symbol *new_elm;
  34 #ifdef DD
  35         fprintf(stderr, "tab_add_symbol: tab(%08X), ident(%s), type(%i), check(%i), param_index(%i)\n", tab, ident, type, check, param_index);
  36 #endif
  37
  38         if(tab_lookup(tab, ident, type) != SYMNULL) {
  39                 if(check) {
  40                         fprintf(stderr, "Identifier doppelt vorhanden: \"%s\"\n", ident);
  41                         exit(3);
  42                 } else {
  43                         tab = tab_remove_symbol(tab, ident, type);
  44                 }
  45         }
  46
  47         new_elm = (struct symbol *) malloc(sizeof(struct symbol));
  48         new_elm->next = SYMNULL;
  49         new_elm->ident = strdup(ident);
  50         new_elm->type = type;
  51         if(type == S_PARM) {
  52                 new_elm->param_index = param_index;
  53         }
  54
  55         if(tab == SYMNULL) {
  56                 return new_elm;
  57         }
  58
  59         while(elm->next != SYMNULL) {
  60                 elm = elm->next;
  61         }
  62         elm->next = new_elm;
  63
  64         return tab;
  65 }
  66
  67 struct symbol *tab_lookup(struct symbol *tab, char *ident, short type)
  68 {
  69         struct symbol *elm = tab;
  70
  71         if(tab == SYMNULL) {
  72                 return SYMNULL;
  73         }
  74
  75         do {
  76                 if((elm->type & type) && (strcmp(elm->ident, ident) == 0)) {
  77                         return elm;
  78                 }
  79                 elm = elm->next;
  80         } while(elm != SYMNULL);
  81
  82         return SYMNULL;
  83 }
  84
  85 struct symbol *tab_merge(struct symbol *tab, struct symbol *to_add, short check)
  86 {
  87         struct symbol *elm = to_add;
  88         struct symbol *ntab = tab_clone(tab);
  89 #ifdef DD
  90         fprintf(stderr, "tab_merge: tab(%08X), to_add(%08X), check(%i), ntab(%08X)\n", tab, to_add, check, ntab);
  91 #endif
  92
  93         while(elm != SYMNULL) {
  94                 ntab = tab_add_symbol(ntab, elm->ident, elm->type, check, elm->param_index ? elm->param_index : 0);
  95                 elm = elm->next;
  96         }
  97
  98         return ntab;
  99 }
 100
 101 struct symbol *tab_remove_symbol(struct symbol *tab, char *ident, short type)
 102 {
 103         struct symbol *elm = tab;
 104         struct symbol *previous_elm = SYMNULL;
 105
 106         while(elm != SYMNULL) {
 107                 if((elm->type == type) && (strcmp(elm->ident, ident) == 0)) {
 108                         if(previous_elm == SYMNULL) {
 109                                 tab = elm->next;
 110                         } else {
 111                                 previous_elm->next = elm->next;
 112                         }
 113                         (void)free(elm->ident);
 114                         (void)free(elm);
 115                         break;
 116                 }
 117                 previous_elm = elm;
 118                 elm = elm->next;
 119         }
 120
 121         return tab;
 122 }
 123
 124 void check(struct symbol *tab, char *ident, short type)
 125 {
 126         struct symbol *elm;
 127 #ifdef DD
 128         fprintf(stderr, "check: tab(%08X), ident(%s), type(%i), elm(%08X)\n", tab, ident, type, elm);
 129 #endif
 130
 131         if(type & (S_VAR | S_PARM)) {
 132                 elm = tab_lookup(tab, ident, type);
 133                 if(elm != SYMNULL) {
 134                         return;
 135                 }
 136         }
 137
 138         /* keine passende variable gefunden?
 139          * => vllt gibt es ja ein passenden feldnamen */
 140         elm = tab_lookup(tab, ident, S_FIELD);
 141         if(elm == SYMNULL) {
 142                 fprintf(stderr, "Unbekannter Identifier: \"%s\"\n", ident);
 143                 exit(3);
 144         }
 145 }
 146