X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/2073e1b6023bef516150070c8fd8239a1d8f873e..7b18c112316339685df9ba15f44741c608a29145:/src/symtab.h
diff --git a/src/symtab.h b/src/symtab.h
index 00770a6e..7d8cf982 100644
--- a/src/symtab.h
+++ b/src/symtab.h
@@ -1,24 +1,22 @@
/* Definitions for symtab.c and callers, part of Bison.
- Copyright (C) 1984, 1989, 1992, 2000, 2001, 2002, 2004, 2005, 2006
- Free Software Foundation, Inc.
+ Copyright (C) 1984, 1989, 1992, 2000-2002, 2004-2007, 2009-2012 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see . */
/**
* \file symtab.h
@@ -30,6 +28,7 @@
# include "assoc.h"
# include "location.h"
+# include "scan-code.h"
# include "uniqstr.h"
/*----------.
@@ -61,17 +60,31 @@ struct symbol
/** The location of its first occurrence. */
location location;
- /** Its %type and associated printer and destructor. */
+ /** 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;
- /** Does not own the memory. */
- const char *destructor;
- location destructor_location;
+ /** Any \c \%destructor declared specifically for this symbol.
+
+ Access this field only through symbol's interface
+ functions. For example, if symbol::destructor = NULL, 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;
- /** Printer. */
- const char *printer;
- location printer_location;
+ /** Any \c \%printer declared specifically for this symbol.
+
+ Access this field only through symbol's interface functions.
+ \sa symbol::destructor */
+ code_props printer;
symbol_number number;
location prec_location;
@@ -79,23 +92,22 @@ struct symbol
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;
};
-
/** 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 (-1)
@@ -114,8 +126,14 @@ symbol *symbol_get (const char *key, location loc);
Its name cannot conflict with the user's names. */
symbol *dummy_symbol_get (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);
+/** Is this a dummy nonterminal? */
+bool symbol_is_dummy (const symbol *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.
@@ -123,10 +141,18 @@ void symbol_make_alias (symbol *sym, symbol *symval, location loc);
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, 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. */
-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.
@@ -155,19 +181,50 @@ extern symbol *accept;
/** 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;
-/*---------------.
-| 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);
+
+/** Set the \c printer associated with \c type. */
+void semantic_type_printer_set (semantic_type *type,
+ code_props const *printer);
-/** Create the symbol table. */
+/*----------------------------------.
+| 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.
@@ -181,4 +238,19 @@ void symbols_check_defined (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_ */