src/symlist.h

   1 /* Lists of symbols for Bison
   2
   3    Copyright (C) 2002, 2005-2007, 2009-2012 Free Software Foundation,
   4    Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef SYMLIST_H_
  22 # define SYMLIST_H_
  23
  24 # include "location.h"
  25 # include "scan-code.h"
  26 # include "symtab.h"
  27 # include "named-ref.h"
  28
  29 /* A list of symbols, used during the parsing to store the rules.  */
  30 typedef struct symbol_list
  31 {
  32   /**
  33    * Whether this node contains a symbol, a semantic type, a \c <*>, or a
  34    * \c <>.
  35    */
  36   enum {
  37     SYMLIST_SYMBOL,
  38     SYMLIST_TYPE
  39   } content_type;
  40   union {
  41     /**
  42      * The symbol or \c NULL iff
  43      * <tt>symbol_list::content_type = SYMLIST_SYMBOL</tt>.
  44      */
  45     symbol *sym;
  46     /**
  47      * The semantic type iff <tt>symbol_list::content_type = SYMLIST_TYPE</tt>.
  48      */
  49     semantic_type *sem_type;
  50   } content;
  51   location location;
  52
  53   /* Proper location of the symbol, not all the rule */
  54   location sym_loc;
  55
  56   /* If this symbol is the generated lhs for a midrule but this is the rule in
  57      whose rhs it appears, MIDRULE = a pointer to that midrule.  */
  58   struct symbol_list *midrule;
  59
  60   /* If this symbol is the generated lhs for a midrule and this is that
  61      midrule, MIDRULE_PARENT_RULE = a pointer to the rule in whose rhs it
  62      appears, and MIDRULE_PARENT_RHS_INDEX = its rhs index (1-origin) in the
  63      parent rule.  */
  64   struct symbol_list *midrule_parent_rule;
  65   int midrule_parent_rhs_index;
  66
  67   /* The action is attached to the LHS of a rule, but action properties for
  68    * each RHS are also stored here.  */
  69   code_props action_props;
  70
  71   /* Precedence/associativity.  */
  72   symbol *ruleprec;
  73   int dprec;
  74   int merger;
  75   location merger_declaration_location;
  76
  77   /* Named reference. */
  78   named_ref *named_ref;
  79
  80   /* The list.  */
  81   struct symbol_list *next;
  82 } symbol_list;
  83
  84
  85 /** Create a list containing \c sym at \c loc.  */
  86 symbol_list *symbol_list_sym_new (symbol *sym, location loc);
  87
  88 /** Create a list containing \c type_name at \c loc.  */
  89 symbol_list *symbol_list_type_new (uniqstr type_name, location loc);
  90
  91 /** Print this list.
  92
  93   \pre For every node \c n in the list, <tt>n->content_type =
  94   SYMLIST_SYMBOL</tt>.  */
  95 void symbol_list_syms_print (const symbol_list *l, FILE *f);
  96
  97 /** Prepend \c node to \c list.  */
  98 symbol_list *symbol_list_prepend (symbol_list *list, symbol_list *node);
  99
 100 /** Free \c list, but not the items it contains.  */
 101 void symbol_list_free (symbol_list *list);
 102
 103 /** Return the length of \c l. */
 104 int symbol_list_length (symbol_list const *l);
 105
 106 /** Get item \c n in symbol list \c l.  */
 107 symbol_list *symbol_list_n_get (symbol_list *l, int n);
 108
 109 /* Get the data type (alternative in the union) of the value for
 110    symbol N in rule RULE.  */
 111 uniqstr symbol_list_n_type_name_get (symbol_list *l, location loc, int n);
 112
 113 /* Check whether the node is a border element of a rule. */
 114 bool symbol_list_null (symbol_list *node);
 115
 116 /** Set the \c \%destructor or \c \%printer for \c node as \c code at
 117     \c loc.  */
 118 void symbol_list_code_props_set (symbol_list *node, code_props_type kind,
 119                                  location loc, char const *code);
 120
 121 #endif /* !SYMLIST_H_ */