X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/ec5479ce351b0365549e9c7d570b0ee86a4a6589..4654b0c0a8a355e7a8fcdf51b1a5eb6c485126f1:/src/symtab.h?ds=sidebyside

diff --git a/src/symtab.h b/src/symtab.h
index 1a3ada4c..0e521626 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,24 +1,22 @@
 /* Definitions for symtab.c and callers, part of Bison.
 
-   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006
+   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008
    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   Bison is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-   Bison is distributed in the hope that it will be useful,
+   This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /**
  * \file symtab.h
@@ -30,6 +28,7 @@
 
 # include "assoc.h"
 # include "location.h"
+# include "scan-code.h"
 # include "uniqstr.h"
 
 /*----------.
@@ -69,28 +68,16 @@ struct symbol
   /** Any \c \%destructor declared specifically for this symbol.
 
      Access this field only through <tt>symbol</tt>'s interface functions.  For
-     example, if <tt>symbol::destructor = NULL</tt>, the default
-     \c \%destructor or a per-type \c \%destructor might be appropriate, and
+     example, if <tt>symbol::destructor = NULL</tt>, a default \c \%destructor
+     or a per-type \c \%destructor might be appropriate, and
      \c symbol_destructor_get will compute the correct one.  */
-  const char *destructor;
-
-  /** The location of \c symbol::destructor.
-
-     Access this field only through <tt>symbol</tt>'s interface functions.
-     \sa symbol::destructor  */
-  location destructor_location;
+  code_props destructor;
 
   /** Any \c \%printer declared specifically for this symbol.
 
      Access this field only through <tt>symbol</tt>'s interface functions.
      \sa symbol::destructor  */
-  const char *printer;
-
-  /** The location of \c symbol::printer.
-
-     Access this field only through <tt>symbol</tt>'s interface functions.
-     \sa symbol::destructor  */
-  location printer_location;
+  code_props printer;
 
   symbol_number number;
   location prec_location;
@@ -106,7 +93,6 @@ struct symbol
   bool declared;
 };
 
-
 /** Undefined user number.  */
 #define USER_NUMBER_UNDEFINED -1
 
@@ -119,9 +105,6 @@ struct symbol
 /* Undefined internal token number.  */
 #define NUMBER_UNDEFINED (-1)
 
-/** Print a symbol (for debugging). */
-void symbol_print (symbol *s, FILE *f);
-
 /** Fetch (or create) the symbol associated to KEY.  */
 symbol *symbol_from_uniqstr (const uniqstr key, location loc);
 
@@ -133,6 +116,23 @@ symbol *symbol_get (const char *key, location loc);
    Its name cannot conflict with the user's names.  */
 symbol *dummy_symbol_get (location loc);
 
+
+/*--------------------.
+| Methods on symbol.  |
+`--------------------*/
+
+/** Print a symbol (for debugging). */
+void symbol_print (symbol *s, FILE *f);
+
+/** Is this a dummy nonterminal?  */
+bool symbol_is_dummy (const symbol *sym);
+
+/** Return the name of the symbol that can be used as an identifier.
+ ** Consider the alias if needed.
+ ** Return 0 if there is none (e.g., the symbol is only defined as
+ ** a string). */
+uniqstr symbol_id_get (symbol const *sym);
+
 /** Declare the new symbol \c sym.  Make it an alias of \c symval.  */
 void symbol_make_alias (symbol *sym, symbol *symval, location loc);
 
@@ -141,27 +141,22 @@ void symbol_make_alias (symbol *sym, symbol *symval, location loc);
     Do nothing if passed 0 as \c type_name.  */
 void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
 
-/** Set the \c destructor associated with \c sym.  */
-void symbol_destructor_set (symbol *sym, const char *destructor, location loc);
+/** Get the \c class string associated with \c sym.  */
+const char *symbol_class_get_string (symbol *sym);
 
-/** Get the computed \c \%destructor for \c sym, or \c NULL if none.   */
-const char *symbol_destructor_get (symbol *sym);
+/** Set the \c destructor associated with \c sym.  */
+void symbol_destructor_set (symbol *sym, code_props const *destructor);
 
-/** Get the grammar location of the computed \c \%destructor for \c sym.
- 
-  \pre <tt>symbol_destructor_get (sym) != NULL</tt> */
-location symbol_destructor_location_get (symbol *sym);
+/** Get the computed \c \%destructor for \c sym, which was initialized with
+    \c code_props_none_init if there's no \c \%destructor.  */
+code_props const *symbol_destructor_get (symbol const *sym);
 
 /** Set the \c printer associated with \c sym.  */
-void symbol_printer_set (symbol *sym, const char *printer, location loc);
+void symbol_printer_set (symbol *sym, code_props const *printer);
 
-/** Get the computed \c \%printer for \c sym, or \c NULL if none.  */
-const char *symbol_printer_get (symbol *sym);
-
-/** Get the grammar location of the computed \c \%printer for \c sym.
-
-  \pre <tt>symbol_printer_get (sym) != NULL</tt> */
-location symbol_printer_location_get (symbol *sym);
+/** Get the computed \c \%printer for \c sym, which was initialized with
+    \c code_props_none_init if there's no \c \%printer.  */
+code_props const *symbol_printer_get (symbol const *sym);
 
 /* Set the \c precedence associated with \c sym.
 
@@ -177,6 +172,11 @@ void symbol_class_set (symbol *sym, symbol_class class, location loc,
 void symbol_user_token_number_set (symbol *sym, int user_number, location loc);
 
 
+
+/*------------------.
+| Special symbols.  |
+`------------------*/
+
 /** The error token. */
 extern symbol *errtoken;
 /** The token for unknown tokens.  */
@@ -194,15 +194,46 @@ extern symbol *startsymbol;
 extern location startsymbol_location;
 
 
-/*---------------.
-| Symbol table.  |
-`---------------*/
+/*-----------------.
+| Semantic types.  |
+`-----------------*/
+
+/** A semantic type and its associated \c \%destructor and \c \%printer.
+
+   Access the fields of this struct only through the interface functions in
+   this file.  \sa symbol::destructor  */
+typedef struct {
+  /** The key, name of the semantic type.  */
+  uniqstr tag;
+
+  /** Any \c %destructor declared for this semantic type.  */
+  code_props destructor;
+  /** Any \c %printer declared for this semantic type.  */
+  code_props printer;
+} semantic_type;
+
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_from_uniqstr (const uniqstr key);
+
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_get (const char *key);
+
+/** Set the \c destructor associated with \c type.  */
+void semantic_type_destructor_set (semantic_type *type,
+                                   code_props const *destructor);
+
+/** Set the \c printer associated with \c type.  */
+void semantic_type_printer_set (semantic_type *type,
+                                code_props const *printer);
 
+/*----------------------------------.
+| Symbol and semantic type tables.  |
+`----------------------------------*/
 
-/** Create the symbol table.  */
+/** Create the symbol and semantic type tables.  */
 void symbols_new (void);
 
-/** Free all the memory allocated for symbols.  */
+/** Free all the memory allocated for symbols and semantic types.  */
 void symbols_free (void);
 
 /** Check that all the symbols are defined.
@@ -217,14 +248,18 @@ void symbols_check_defined (void);
 void symbols_pack (void);
 
 
-/*-----------------------------------.
-| Default %destructor and %printer.  |
-`-----------------------------------*/
+/*---------------------------------------.
+| Default %destructor's and %printer's.  |
+`---------------------------------------*/
 
-/** Set the default \c \%destructor.  */
-void default_destructor_set (const char *destructor, location loc);
+/** Set the default \c \%destructor for tagged values.  */
+void default_tagged_destructor_set (code_props const *destructor);
+/** Set the default \c \%destructor for tagless values.  */
+void default_tagless_destructor_set (code_props const *destructor);
 
-/** Set the default \c \%printer.  */
-void default_printer_set (const char *printer, location loc);
+/** Set the default \c \%printer for tagged values.  */
+void default_tagged_printer_set (code_props const *printer);
+/** Set the default \c \%printer for tagless values.  */
+void default_tagless_printer_set (code_props const *printer);
 
 #endif /* !SYMTAB_H_ */