Destroy the lhs symbols after reduction.

[bison.git] / src / symtab.h

diff --git a/src/symtab.h b/src/symtab.h
index 00770a6e24807fbea6c3eb27db14d48cadbb9de9..fe37716a109f8b59e7c7f07df098622ca8e63dc1 100644 (file)
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,24 +1,22 @@
 /* Definitions for symtab.c and callers, part of Bison.
 
 /* 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

    Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
    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
    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
    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
 
 /**
  * \file symtab.h


@@ -30,6 +28,7 @@
 
 # include "assoc.h"
 # include "location.h"
 
 # include "assoc.h"
 # include "location.h"

+# include "scan-code.h"

 # include "uniqstr.h"
 
 /*----------.
 # include "uniqstr.h"
 
 /*----------.


@@ -61,17 +60,24 @@ struct symbol
   /** The location of its first occurrence.  */
   location location;
 
   /** The location of its first occurrence.  */
   location location;
 

-  /** Its %type and associated printer and destructor.  */
+  /** Its \c \%type.  */

   uniqstr type_name;
   uniqstr type_name;

+  /** Its \c \%type's location.  */

   location type_location;
 
   location type_location;
 

-  /** Does not own the memory. */
-  const char *destructor;
-  location destructor_location;
+  /** Any \c \%destructor declared specifically for this symbol.

 
 

-  /** Printer. */
-  const char *printer;
-  location printer_location;
+     Access this field only through <tt>symbol</tt>'s interface functions.  For
+     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.  */
+  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  */
+  code_props printer;

 
   symbol_number number;
   location prec_location;
 
   symbol_number number;
   location prec_location;


@@ -87,7 +93,6 @@ struct symbol
   bool declared;
 };
 
   bool declared;
 };
 

-

 /** Undefined user number.  */
 #define USER_NUMBER_UNDEFINED -1
 
 /** Undefined user number.  */
 #define USER_NUMBER_UNDEFINED -1
 


@@ -114,6 +119,9 @@ symbol *symbol_get (const char *key, location loc);
    Its name cannot conflict with the user's names.  */
 symbol *dummy_symbol_get (location loc);
 
    Its name cannot conflict with the user's names.  */
 symbol *dummy_symbol_get (location loc);
 

+/** Is this a dummy nonterminal?  */
+bool symbol_is_dummy (const symbol *sym);
+

 /** Declare the new symbol \c sym.  Make it an alias of \c symval.  */
 void symbol_make_alias (symbol *sym, symbol *symval, location loc);
 
 /** Declare the new symbol \c sym.  Make it an alias of \c symval.  */
 void symbol_make_alias (symbol *sym, symbol *symval, location loc);
 


@@ -122,11 +130,22 @@ 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);
 
     Do nothing if passed 0 as \c type_name.  */
 void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
 

+/** Get the \c class string associated with \c sym.  */
+const char *symbol_class_get_string (symbol *sym);
+

 /** Set the \c destructor associated with \c sym.  */
 /** Set the \c destructor associated with \c sym.  */

-void symbol_destructor_set (symbol *sym, const char *destructor, location loc);
+void symbol_destructor_set (symbol *sym, code_props const *destructor);
+
+/** 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.  */
 
 /** 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, 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.
 
 
 /* Set the \c precedence associated with \c sym.
 


@@ -155,19 +174,50 @@ extern symbol *accept;
 
 /** The user start symbol. */
 extern symbol *startsymbol;
 
 /** The user start symbol. */
 extern symbol *startsymbol;

-/** The location of the \c %start declaration.  */
+/** The location of the \c \%start declaration.  */

 extern location startsymbol_location;
 
 
 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;

 
 

-/** Create the symbol table.  */
+/** 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 and semantic type tables.  */

 void symbols_new (void);
 
 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.
 void symbols_free (void);
 
 /** Check that all the symbols are defined.


@@ -181,4 +231,19 @@ void symbols_check_defined (void);
    #token_translations.  */
 void symbols_pack (void);
 
    #token_translations.  */
 void symbols_pack (void);
 

+
+/*---------------------------------------.
+| Default %destructor's and %printer's.  |
+`---------------------------------------*/
+
+/** 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 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_ */
 #endif /* !SYMTAB_H_ */