scope.c

   1 /*
   2  * Symbol scoping.
   3  *
   4  * This is pretty trivial.
   5  *
   6  * Copyright (C) 2003 Linus Torvalds, all rights reserved.
   7  */
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include "lib.h"
  12 #include "symbol.h"
  13 #include "scope.h"
  14
  15 static struct scope
  16          base_scope = { .next = &base_scope },
  17         *current_scope = &base_scope;
  18
  19 void bind_scope(struct symbol *sym)
  20 {
  21         add_symbol(&current_scope->symbols, sym);
  22 }
  23
  24 void start_symbol_scope(void)
  25 {
  26         struct scope *scope = __alloc_bytes(sizeof(*scope));
  27         memset(scope, 0, sizeof(*scope));
  28         scope->next = current_scope;
  29         current_scope = scope;
  30 }
  31
  32 static void remove_symbol_scope(struct symbol *sym, void *data, int flags)
  33 {
  34         struct symbol **ptr = sym->id_list;
  35
  36         while (*ptr != sym)
  37                 ptr = &(*ptr)->next_id;
  38         *ptr = sym->next_id;
  39 }
  40
  41 void end_symbol_scope(void)
  42 {
  43         struct scope *scope = current_scope;
  44         struct symbol_list *symbols = scope->symbols;
  45
  46         current_scope = scope->next;
  47         scope->symbols = NULL;
  48         symbol_iterate(symbols, remove_symbol_scope, NULL);
  49 }