maint: remove trailing empty lines.

[bison.git] / src / symtab.h

diff --git a/src/symtab.h b/src/symtab.h
index 1424a41b7cdd723467eb92f2d309c6d665c02572..651552278fcd4f3d3b8cef84280b55391b23961f 100644 (file)
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,160 +1,265 @@
-/* Definitions for symtab.c and callers, part of bison,
-   Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002
-   Free Software Foundation, Inc.
+/* Definitions for symtab.c and callers, part of Bison.
+
+   Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2012 Free Software
+   Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, 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_
 
 
 #ifndef SYMTAB_H_
 # define SYMTAB_H_
 

+# include "assoc.h"

 # include "location.h"
 # include "location.h"

+# include "scan-code.h"
+# include "uniqstr.h"

 
 /*----------.
 | Symbols.  |
 `----------*/
 
 
 /*----------.
 | Symbols.  |
 `----------*/
 

-/* Associativity values for tokens and rules.  */
+/** Symbol classes.  */

 typedef enum
 {
 typedef enum
 {

-  undef_assoc,
-  right_assoc,
-  left_assoc,
-  non_assoc
-} associativity;
-
-
-/* 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;
 
 
 } symbol_class;
 
 

-/* Internal token numbers. */
-typedef short symbol_number_t;
-
+/** Internal token numbers. */
+typedef int symbol_number;
+#define SYMBOL_NUMBER_MAXIMUM INT_MAX

 
 

-typedef struct symbol_s symbol_t;
-struct symbol_s
-{
-  /* The key, name of the symbol. */
-  char *tag;
-  /* Its type. */
-  char *type_name;

 
 

-  /* The location of its first occurence. */
-  location_t location;
+typedef struct symbol symbol;

 
 

-  symbol_number_t number;
-  short prec;
-  associativity assoc;
+/* When extending this structure, be sure to complete
+   symbol_check_alias_consistency.  */
+struct symbol
+{
+  /** The key, name of the symbol.  */
+  uniqstr tag;
+  /** The location of its first occurrence.  */
+  location location;
+
+  /** Its \c \%type.  */
+  uniqstr type_name;
+  /** Its \c \%type's location.  */
+  location type_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;
+
+  /** 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;
+  int prec;
+  assoc assoc;

   int user_token_number;
 
   int user_token_number;
 

-  /* Points to the other in the identifier-symbol pair for an alias.
-     Special value USER_NUMBER_ALIAS in the identifier half of the
-     identifier-symbol pair for an alias.  */
-  symbol_t *alias;
+  /* Points to the other in the symbol-string pair for an alias.
+     Special value USER_NUMBER_HAS_STRING_ALIAS in the symbol half of the
+     symbol-string pair for an alias.  */
+  symbol *alias;

   symbol_class class;
   symbol_class class;

+  bool declared;

 };
 
 };
 

-/* Undefined user number.  */
+/** Undefined user number.  */

 #define USER_NUMBER_UNDEFINED -1
 
 #define USER_NUMBER_UNDEFINED -1
 

-/* `symbol->user_token_number == USER_NUMBER_ALIAS' means this symbol
-   *has* (not is) a string literal alias.  For instance, `%token foo
+/* `symbol->user_token_number == USER_NUMBER_HAS_STRING_ALIAS' means
+   this symbol has a literal string alias.  For instance, `%token foo

    "foo"' has `"foo"' numbered regularly, and `foo' numbered as
    "foo"' has `"foo"' numbered regularly, and `foo' numbered as

-   USER_NUMBER_ALIAS.  */
-#define USER_NUMBER_ALIAS -9991
+   USER_NUMBER_HAS_STRING_ALIAS.  */
+#define USER_NUMBER_HAS_STRING_ALIAS -9991

 
 /* Undefined internal token number.  */
 
 /* Undefined internal token number.  */

-#define NUMBER_UNDEFINED ((symbol_number_t) -1)
+#define NUMBER_UNDEFINED (-1)
+
+/** 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.  */
+symbol *symbol_get (const char *key, location loc);
+
+/** Generate a dummy nonterminal.
+
+   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);
+
+/**
+ * Make \c str the literal string alias of \c sym.  Copy token number,
+ * symbol number, and type from \c sym to \c str.
+ */
+void symbol_make_alias (symbol *sym, symbol *str, location loc);
+
+/** 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 \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 \c printer associated with \c sym.  */
+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.
+
+   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 \c class associated with \c sym.  */
+void symbol_class_set (symbol *sym, symbol_class class, location loc,
+                       bool declaring);
+
+/** Set the \c user_token_number associated with \c sym.  */
+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.  */
+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;

 
 

-/* Return the tag of this SYMBOL in a printable form.  Warning: uses
-   the QUOTEARG slot 0.  */
-const char *symbol_tag_get PARAMS ((symbol_t *symbol));

 
 

-/* Return the tag of this SYMBOL in a printable form.  Use the
-   QUOTEARG slot number N.  */
-const char *symbol_tag_get_n PARAMS ((symbol_t *symbol, int n));
+/*-----------------.
+| Semantic types.  |
+`-----------------*/

 
 

-/* Print the tag of this SYMBOL.  */
-void symbol_tag_print PARAMS ((symbol_t *symbol, FILE *out));
+/** A semantic type and its associated \c \%destructor and \c \%printer.

 
 

-/* Fetch (or create) the symbol associated to KEY.  */
-symbol_t *getsym PARAMS ((const char *key, location_t location));
+   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;

 
 

-/* Declare the new SYMBOL.  Make it an alias of SYMVAL.  */
-void symbol_make_alias PARAMS ((symbol_t *symbol, symbol_t *symval));
+  /** Any \c %destructor declared for this semantic type.  */
+  code_props destructor;
+  /** Any \c %printer declared for this semantic type.  */
+  code_props printer;
+} semantic_type;

 
 

-/* Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 as
-   TYPE_NAME.  */
-void symbol_type_set PARAMS ((symbol_t *symbol, char *type_name));
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_from_uniqstr (const uniqstr key);

 
 

-/* Set the PRECEDENCE associated to SYMBOL.  Ensures that SYMBOL is a
-   terminal.  Does nothing if invoked with UNDEF_ASSOC as ASSOC.  */
-void symbol_precedence_set PARAMS ((symbol_t *symbol,
-                                   int prec, associativity assoc));
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_get (const char *key);

 
 

-/* Set the CLASS associated to SYMBOL.  */
-void symbol_class_set PARAMS ((symbol_t *symbol, symbol_class class));
+/** Set the \c destructor associated with \c type.  */
+void semantic_type_destructor_set (semantic_type *type,
+                                   code_props const *destructor);

 
 

-/* Set the USER_TOKEN_NUMBER associated to SYMBOL.  */
-void symbol_user_token_number_set PARAMS ((symbol_t *symbol, int user_number));
+/** 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.  |
+`----------------------------------*/

 
 

-/* Distinguished symbols.  AXIOM is the real start symbol, that used
-   by the automaton.  STARTSYMBOL is the one specified by the user.
-   */
-extern symbol_t *errtoken;
-extern symbol_t *undeftoken;
-extern symbol_t *eoftoken;
-extern symbol_t *axiom;
-extern symbol_t *startsymbol;
-extern location_t startsymbol_location;
+/** Create the symbol and semantic type tables.  */
+void symbols_new (void);

 
 

+/** Free all the memory allocated for symbols and semantic types.  */
+void symbols_free (void);

 
 

-/*---------------.
-| Symbol table.  |
-`---------------*/
+/** Check that all the symbols are defined.

 
 

+    Report any undefined symbols and consider them nonterminals.  */
+void symbols_check_defined (void);

 
 

-/* Create the symbol table.  */
-void symbols_new PARAMS ((void));
+/** Sanity checks and #token_translations construction.

 
 

-/* A function to apply to each symbol. */
-typedef bool (*symbol_processor) PARAMS ((symbol_t *));
+   Perform various sanity checks, assign symbol numbers, and set up
+   #token_translations.  */
+void symbols_pack (void);

 
 

-/* Apply PROCESSOR to all the symbols.  PROCESSOR must return TRUE: on
-   FALSE, the processing stops.  */
-void symbols_do PARAMS ((symbol_processor processor, void *processor_data));

 
 

-/* Free all the memory allocated for symbols.  */
-void symbols_free PARAMS ((void));
+/*---------------------------------------.
+| Default %destructor's and %printer's.  |
+`---------------------------------------*/

 
 

-/* Check that all the symbols are defined.  Report any undefined
-   symbols and consider them nonterminals.  */
-void symbols_check_defined PARAMS ((void));
+/** 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);

 
 

-/* Perform various sanity checks, assign symbol numbers, and set up
-   TOKEN_TRANSLATIONS.  */
-void symbols_pack PARAMS ((void));
+/** 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_ */