X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/24c0aad7e700242c21cf050b3e0f9454b4d2ccb5..595284e9d0277517bac8f3fc7bcdd529d97aa6f9:/src/symtab.h

diff --git a/src/symtab.h b/src/symtab.h
index b7cf6be2..09100f6a 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,168 +1,285 @@
-/* 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.
 
-   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., 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_
 
+# include "assoc.h"
 # include "location.h"
+# include "scan-code.h"
+# include "uniqstr.h"
 
 /*----------.
 | Symbols.  |
 `----------*/
 
-/* Associativity values for tokens and rules.  */
-typedef enum
-{
-  undef_assoc,
-  right_assoc,
-  left_assoc,
-  non_assoc
-} associativity;
-
-
-/* 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. */
-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;
-  /* The location of its first occurence.  */
-  location_t location;
+typedef struct symbol symbol;
+
+/* Declaration status of a symbol.
 
-  /* Its %type and associated destructor.  */
-  char *type_name;
-  char *destructor;
-  location_t destructor_location;
+   First, it is "undeclared".  Then, if "undeclared" and used in a
+   %printer/%destructor, it is "used".  If not "declared" but used in
+   a rule, it is "needed".  Finally, if declared (via a rule for
+   nonterminals, or %token), it is "declared".
 
+   When status are checked at the end, "declared" symbols are fine,
+   "used" symbols trigger warnings, otherwise it's an error.  */
 
-  symbol_number_t number;
-  short prec;
-  associativity assoc;
+typedef enum
+  {
+    /** Used in the input file for an unknown reason (error).  */
+    undeclared,
+    /** Used by %destructor/%printer but not defined (warning).  */
+    used,
+    /** Used in the gramar (rules) but not defined (error).  */
+    needed,
+    /** Defined with %type or %token (good).  */
+    declared,
+  } status;
+
+typedef enum code_props_type code_props_type;
+enum code_props_type
+  {
+    destructor = 0,
+    printer = 1,
+  };
+
+enum { CODE_PROPS_SIZE = 2 };
+
+/* 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.
+
+      Beware that this is the type_name as was entered by the user,
+      including silly things such as "]" if she entered "%token <]> t".
+      Therefore, when outputting type_name to M4, be sure to escape it
+      into "@}".  See quoted_output for instance.  */
+  uniqstr type_name;
+
+  /** Its \c \%type's location.  */
+  location type_location;
+
+  /** Any \c \%destructor (resp. \%printer) declared specificially for this
+      symbol.
+
+      Access this field only through <tt>symbol</tt>'s interface functions. For
+      example, if <tt>symbol::destructor = NULL</tt> (resp. <tt>symbol::printer
+      = NULL</tt>), a default \c \%destructor (resp. \%printer) or a per-type
+      \c symbol_destructor_printer_get will compute the correct one. */
+  code_props props[CODE_PROPS_SIZE];
+
+  symbol_number number;
+  location prec_location;
+  int prec;
+  assoc assoc;
   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;
+  status status;
 };
 
-/* Undefined user number.  */
+/** Undefined user number.  */
 #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
-   USER_NUMBER_ALIAS.  */
-#define USER_NUMBER_ALIAS -9991
+   USER_NUMBER_HAS_STRING_ALIAS.  */
+#define USER_NUMBER_HAS_STRING_ALIAS -9991
 
 /* 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 const *s, FILE *f);
+
+/** Is this a dummy nonterminal?  */
+bool symbol_is_dummy (const symbol *sym);
+
+/** The name of the code_props type: "\%destructor" or "\%printer".  */
+char const *code_props_type_string (code_props_type kind);
+
+/** 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 or \c \%printer associated with \c sym.  */
+void symbol_code_props_set (symbol *sym, code_props_type kind,
+                            code_props const *destructor);
+
+/** Get the computed \c \%destructor or \c %printer for \c sym, which was
+    initialized with \c code_props_none_init if there's no \c \%destructor or
+    \c %printer.  */
+code_props *symbol_code_props_get (symbol *sym, code_props_type kind);
+
+/** 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.  |
+`------------------*/
 
-/* 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));
+/** 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.
 
-/* 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));
+   $accept: start-symbol $end */
+extern symbol *accept;
 
-/* Print the tag of this SYMBOL.  */
-void symbol_tag_print PARAMS ((symbol_t *symbol, FILE *out));
+/** The user start symbol. */
+extern symbol *startsymbol;
+/** The location of the \c \%start declaration.  */
+extern location startsymbol_location;
 
-/* Fetch (or create) the symbol associated to KEY.  */
-symbol_t *getsym PARAMS ((const char *key, location_t location));
 
-/* Declare the new SYMBOL.  Make it an alias of SYMVAL.  */
-void symbol_make_alias PARAMS ((symbol_t *symbol, symbol_t *symval));
+/*-----------------.
+| Semantic types.  |
+`-----------------*/
 
-/* Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 as
-   TYPE_NAME.  */
-void symbol_type_set PARAMS ((symbol_t *symbol, location_t location,
-			      char *type_name));
+/** A semantic type and its associated \c \%destructor and \c \%printer.
 
-/* Set the DESTRUCTOR associated to SYMBOL.  */
-void symbol_destructor_set PARAMS ((symbol_t *symbol, location_t location,
-				    char *destructor));
+   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;
 
-/* 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, location_t location,
-				    int prec, associativity assoc));
+  /** The location of its first occurence.  */
+  location location;
 
-/* Set the CLASS associated to SYMBOL.  */
-void symbol_class_set PARAMS ((symbol_t *symbol, symbol_class class));
+  /** Its status : "undeclared", "used" or "declared".
+      It cannot be "needed".  */
+  status status;
 
-/* Set the USER_TOKEN_NUMBER associated to SYMBOL.  */
-void symbol_user_token_number_set PARAMS ((symbol_t *symbol, int user_number));
+  /** Any \c %destructor and %printer declared for this
+      semantic type.  */
+  code_props props[CODE_PROPS_SIZE];
 
+} semantic_type;
 
-/* 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;
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_from_uniqstr (const uniqstr key,
+                                           const location *loc);
 
+/** Fetch (or create) the semantic type associated to KEY.  */
+semantic_type *semantic_type_get (const char *key, const location *loc);
 
-/*---------------.
-| Symbol table.  |
-`---------------*/
+/** Set the \c destructor or \c printer associated with \c type.  */
+void semantic_type_code_props_set (semantic_type *type,
+                                   code_props_type kind,
+                                   code_props const *code);
 
+/*----------------------------------.
+| Symbol and semantic type tables.  |
+`----------------------------------*/
 
-/* Create the symbol table.  */
-void symbols_new PARAMS ((void));
+/** Create the symbol and semantic type tables.  */
+void symbols_new (void);
 
-/* A function to apply to each symbol. */
-typedef bool (*symbol_processor) PARAMS ((symbol_t *));
+/** Free all the memory allocated for symbols and semantic types.  */
+void symbols_free (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));
+/** Check that all the symbols are defined.
 
-/* Free all the memory allocated for symbols.  */
-void symbols_free PARAMS ((void));
+    Report any undefined symbols and consider them nonterminals.  */
+void symbols_check_defined (void);
 
-/* Check that all the symbols are defined.  Report any undefined
-   symbols and consider them nonterminals.  */
-void symbols_check_defined PARAMS ((void));
+/** Sanity checks and #token_translations construction.
 
-/* Perform various sanity checks, assign symbol numbers, and set up
-   TOKEN_TRANSLATIONS.  */
-void symbols_pack PARAMS ((void));
+   Perform various sanity checks, assign symbol numbers, and set up
+   #token_translations.  */
+void symbols_pack (void);
 
 #endif /* !SYMTAB_H_ */