X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/867a3e0085abd0281d41a7a1a56dea143dadf4eb..6130b75585cad5f4bb2ee78875a0bfe109b2a3e3:/src/symtab.h

diff --git a/src/symtab.h b/src/symtab.h
index 725b6cb8..0e521626 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,46 +1,50 @@
 /* Definitions for symtab.c and callers, part of Bison.
 
-   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005
+   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
+ * \brief Manipulating ::symbol.
+ */
 
 #ifndef SYMTAB_H_
 # define SYMTAB_H_
 
 # include "assoc.h"
 # include "location.h"
+# include "scan-code.h"
 # include "uniqstr.h"
 
 /*----------.
 | Symbols.  |
 `----------*/
 
-/* Symbol classes.  */
+/** Symbol classes.  */
 typedef enum
 {
-  unknown_sym,
-  token_sym,		/* terminal symbol */
-  nterm_sym		/* non-terminal */
+  unknown_sym,          /**< Undefined.  */
+  token_sym,		/**< Terminal. */
+  nterm_sym		/**< Non-terminal. */
 } symbol_class;
 
 
-/* Internal token numbers. */
+/** Internal token numbers. */
 typedef int symbol_number;
 #define SYMBOL_NUMBER_MAXIMUM INT_MAX
 
@@ -51,20 +55,29 @@ typedef struct symbol symbol;
    symbol_check_alias_consistency.  */
 struct symbol
 {
-  /* The key, name of the symbol.  */
+  /** The key, name of the symbol.  */
   uniqstr tag;
-  /* The location of its first occurrence.  */
+  /** The location of its first occurrence.  */
   location location;
 
-  /* Its %type and associated printer and destructor.  */
+  /** Its \c \%type.  */
   uniqstr type_name;
+  /** Its \c \%type's location.  */
   location type_location;
 
-  char *destructor;
-  location destructor_location;
+  /** 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>, 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;
 
-  char *printer;
-  location printer_location;
+  /** 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;
@@ -77,9 +90,10 @@ struct symbol
      identifier-symbol pair for an alias.  */
   symbol *alias;
   symbol_class class;
+  bool declared;
 };
 
-/* Undefined user number.  */
+/** Undefined user number.  */
 #define USER_NUMBER_UNDEFINED -1
 
 /* `symbol->user_token_number == USER_NUMBER_ALIAS' means this symbol
@@ -91,68 +105,161 @@ struct symbol
 /* Undefined internal token number.  */
 #define NUMBER_UNDEFINED (-1)
 
-/* Print a symbol (for debugging). */
-void symbol_print (FILE *f, symbol *s);
+/** Fetch (or create) the symbol associated to KEY.  */
+symbol *symbol_from_uniqstr (const uniqstr key, location loc);
 
-/* Fetch (or create) the symbol associated to KEY.  */
+/** Fetch (or create) the symbol associated to KEY.  */
 symbol *symbol_get (const char *key, location loc);
 
-/* Generate a dummy nonterminal, whose name cannot conflict with the
-   user's names.  */
+/** Generate a dummy nonterminal.
+
+   Its name cannot conflict with the user's names.  */
 symbol *dummy_symbol_get (location loc);
 
-/* Declare the new symbol SYM.  Make it an alias of SYMVAL.  */
+
+/*--------------------.
+| 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);
 
-/* Set the TYPE_NAME associated with SYM.  Do nothing if passed 0 as
-   TYPE_NAME.  */
+/** Set the \c type_name associated with \c sym.
+
+    Do nothing if passed 0 as \c type_name.  */
 void symbol_type_set (symbol *sym, uniqstr type_name, location loc);
 
-/* Set the DESTRUCTOR associated with SYM.  */
-void symbol_destructor_set (symbol *sym, char *destructor, 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.  */
+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 PRINTER associated with SYM.  */
-void symbol_printer_set (symbol *sym, char *printer, location loc);
+/** Set the \c printer associated with \c sym.  */
+void symbol_printer_set (symbol *sym, code_props const *printer);
 
-/* Set the PRECEDENCE associated with SYM.  Ensure that SYMBOL is a
-   terminal.  Do nothing if invoked with UNDEF_ASSOC as ASSOC.  */
+/** 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.
+
+   Ensure that \a symbol is a terminal.
+   Do nothing if invoked with \c undef_assoc as \c assoc.  */
 void symbol_precedence_set (symbol *sym, int prec, assoc a, location loc);
 
-/* Set the CLASS associated with SYM.  */
-void symbol_class_set (symbol *sym, symbol_class class, location loc);
+/** Set the \c class associated with \c sym.  */
+void symbol_class_set (symbol *sym, symbol_class class, location loc,
+		       bool declaring);
 
-/* Set the USER_TOKEN_NUMBER associated with SYM.  */
+/** Set the \c user_token_number associated with \c sym.  */
 void symbol_user_token_number_set (symbol *sym, int user_number, location loc);
 
 
-/* Distinguished symbols.  AXIOM is the real start symbol, that used
-   by the automaton.  STARTSYMBOL is the one specified by the user.
-   */
+
+/*------------------.
+| Special symbols.  |
+`------------------*/
+
+/** The error token. */
 extern symbol *errtoken;
+/** The token for unknown tokens.  */
 extern symbol *undeftoken;
+/** The end of input token.  */
 extern symbol *endtoken;
+/** The genuine start symbol.
+
+   $accept: start-symbol $end */
 extern symbol *accept;
+
+/** The user start symbol. */
 extern symbol *startsymbol;
+/** The location of the \c \%start declaration.  */
 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);
 
-/* Create the symbol table.  */
+/** 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);
 
-/* 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.  Report any undefined
-   symbols and consider them nonterminals.  */
+/** Check that all the symbols are defined.
+
+    Report any undefined symbols and consider them nonterminals.  */
 void symbols_check_defined (void);
 
-/* Perform various sanity checks, assign symbol numbers, and set up
-   TOKEN_TRANSLATIONS.  */
+/** Sanity checks and #token_translations construction.
+
+   Perform various sanity checks, assign symbol numbers, and set up
+   #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_ */