scope.h

   1 #ifndef SCOPE_H
   2 #define SCOPE_H
   3 /*
   4  * Symbol scoping is pretty simple.
   5  *
   6  * Copyright (C) 2003 Transmeta Corp.
   7  *               2003 Linus Torvalds
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 struct symbol;
  29 struct position;
  30
  31 struct scope {
  32         struct token *token;
  33         struct symbol_list *symbols;    /* List of symbols in this scope */
  34         struct scope *next;
  35 };
  36
  37 extern struct scope
  38                 *block_scope,
  39                 *label_scope,
  40                 *function_scope,
  41                 *file_scope,
  42                 *global_scope;
  43
  44 static inline int toplevel(struct scope *scope)
  45 {
  46         return scope == file_scope || scope == global_scope;
  47 }
  48
  49 extern void start_file_scope(void);
  50 extern void end_file_scope(void);
  51 extern void new_file_scope(void);
  52
  53 extern void start_block_scope(struct position pos);
  54 extern void end_block_scope(void);
  55
  56 extern void start_function_scope(struct position pos);
  57 extern void end_function_scope(void);
  58
  59 extern void start_label_scope(struct position pos);
  60 extern void end_label_scope(void);
  61
  62 extern void set_current_scope(struct symbol *);
  63 extern void bind_scope(struct symbol *, struct scope *);
  64 extern void rebind_scope(struct symbol *, struct scope *);
  65
  66 extern int is_outer_scope(struct scope *);
  67 extern int is_in_scope(struct scope *outer, struct scope *inner);
  68
  69 #endif