/* Definitions for symtab.c and callers, part of Bison.
- Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006, 2007
- Free Software Foundation, Inc.
+ Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2013 Free Software
+ Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
typedef enum
{
unknown_sym, /**< Undefined. */
- token_sym, /**< Terminal. */
- nterm_sym /**< Non-terminal. */
+ token_sym, /**< Terminal. */
+ nterm_sym /**< Non-terminal. */
} symbol_class;
/** Internal token numbers. */
typedef int symbol_number;
-#define SYMBOL_NUMBER_MAXIMUM INT_MAX
+# define SYMBOL_NUMBER_MAXIMUM INT_MAX
typedef struct symbol symbol;
+/* Declaration status of a symbol.
+
+ 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. */
+
+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 location of its first occurrence. */
location location;
- /** Its \c \%type. */
+ /** 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 declared specifically for this symbol.
+ /** 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>, 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;
+ 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;
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. */
+ /* 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;
- bool declared;
+ status status;
};
/** 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
- "foo"' has `"foo"' numbered regularly, and `foo' numbered as
- USER_NUMBER_ALIAS. */
-#define USER_NUMBER_ALIAS -9991
+/* '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_HAS_STRING_ALIAS. */
+# define USER_NUMBER_HAS_STRING_ALIAS -9991
/* Undefined internal token number. */
-#define NUMBER_UNDEFINED (-1)
-
-/** Print a symbol (for debugging). */
-void symbol_print (symbol *s, FILE *f);
+# define NUMBER_UNDEFINED (-1)
/** Fetch (or create) the symbol associated to KEY. */
symbol *symbol_from_uniqstr (const uniqstr 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 const *s, FILE *f);
+
/** 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);
+/** 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);
-/** 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 \c \%destructor or \c \%printer associated with \c sym. */
+void symbol_code_props_set (symbol *sym, code_props_type kind,
+ code_props const *destructor);
-/** Set the \c printer associated with \c sym. */
-void symbol_printer_set (symbol *sym, code_props const *printer);
+/** 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);
-/** 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.
-
- Ensure that \a symbol is a terminal.
- Do nothing if invoked with \c undef_assoc as \c assoc. */
+ 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);
+ 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 location startsymbol_location;
+
+/*-------------------.
+| Symbol Relations. |
+`-------------------*/
+
+/* The symbol relations are represented by a directed graph. */
+
+/* The id of a node */
+typedef int graphid;
+
+typedef struct symgraphlink symgraphlink;
+
+struct symgraphlink
+{
+ /** The second \c symbol or group of a precedence relation.
+ * See \c symgraph. */
+ graphid id;
+
+ symgraphlink *next;
+};
+
+/* Symbol precedence graph, to store the used precedence relations between
+ * symbols. */
+
+typedef struct symgraph symgraph;
+
+struct symgraph
+{
+ /** Identifier for the node: equal to the number of the symbol. */
+ graphid id;
+
+ /** The list of related symbols that have a smaller precedence. */
+ symgraphlink *succ;
+
+ /** The list of related symbols that have a greater precedence. */
+ symgraphlink *pred;
+};
+
+/** Register a new precedence relation as used. */
+
+void register_precedence (graphid first, graphid snd);
+
+/** Print a warning for each symbol whose precedence and/or associativity
+ * is useless. */
+
+void print_precedence_warnings (void);
+
+/*----------------------.
+| Symbol associativity |
+`----------------------*/
+
+void register_assoc (graphid i, graphid j);
+
/*-----------------.
| Semantic types. |
`-----------------*/
/** 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;
+ /** The location of its first occurence. */
+ location location;
+
+ /** Its status : "undeclared", "used" or "declared".
+ It cannot be "needed". */
+ status status;
+
+ /** Any \c %destructor and %printer declared for this
+ semantic type. */
+ code_props props[CODE_PROPS_SIZE];
+
} semantic_type;
/** Fetch (or create) the semantic type associated to KEY. */
-semantic_type *semantic_type_from_uniqstr (const uniqstr 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);
-
-/** Set the \c destructor associated with \c type. */
-void semantic_type_destructor_set (semantic_type *type,
- code_props const *destructor);
+semantic_type *semantic_type_get (const char *key, const location *loc);
-/** Set the \c printer associated with \c type. */
-void semantic_type_printer_set (semantic_type *type,
- code_props const *printer);
+/** 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. |
#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_ */
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