-/* Bison Code Data Structure and Scanner.
+/* Bison code properties structure and scanner.
- Copyright (C) 2006 Free Software Foundation, Inc.
+ Copyright (C) 2006-2007, 2009-2012 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- This program 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 of the License, or
+ the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; 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/>. */
#ifndef SCAN_CODE_H_
# define SCAN_CODE_H_
# include "location.h"
+# include "named-ref.h"
struct symbol_list;
/**
- * \brief
- * Keeps track of the maximum number of semantic values to the left of a
- * handle (those referenced by \c $0, \c $-1, etc.) that are required by the
- * semantic actions of this grammar.
+ * Keeps track of the maximum number of semantic values to the left of a handle
+ * (those referenced by $0, $-1, etc.) that are required by the semantic
+ * actions of this grammar.
*/
extern int max_left_semantic_context;
/**
- * \brief
- * A code passage captured from the grammar file and possibly translated,
- * and/or properties associated with such a code passage.
- * \note
- * - Don't break encapsulation by accessing the fields directly. Use the
- * provided interface functions.
+ * A code passage captured from the grammar file and possibly translated,
+ * and/or properties associated with such a code passage. Don't break
+ * encapsulation by modifying the fields directly. Use the provided interface
+ * functions.
*/
typedef struct code_props {
- /**
- * \brief
- * What kind of \c code_props this is.
- * \sa
- * - \c code_props_none_init
- * - \c code_props_plain_init
- * - \c code_props_symbol_action_init
- * - \c code_props_rule_action_init
- */
+ /** Set by the init functions. */
enum {
CODE_PROPS_NONE, CODE_PROPS_PLAIN,
CODE_PROPS_SYMBOL_ACTION, CODE_PROPS_RULE_ACTION
} kind;
/**
- * \brief
- * The code passage contained within this \c code_props.
- * \invariant
- * - <tt>code_props::code = NULL</tt> iff
- * <tt>code_props::kind = CODE_PROPS_NONE</tt>.
+ * \c NULL iff \c code_props::kind is \c CODE_PROPS_NONE.
+ * Memory is allocated in an obstack freed elsewhere.
*/
char const *code;
- /**
- * \brief
- * The grammar file location of \c code_props::code.
- * \invariant
- * - \c code_props::location is undefined iff
- * <tt>code_props::code = NULL</tt>.
- */
+ /** Undefined iff \c code_props::code is \c NULL. */
location location;
+
/**
- * \brief
- * The value returned by \c code_props_is_value_used for this
- * \c code_props.
+ * \c false iff either:
+ * - \c code_props_translate_code has never previously been invoked for
+ * the \c code_props that would contain the code passage associated
+ * with \c self. (That \c code_props is not the same as this one if this
+ * one is for a RHS \c symbol_list node. Instead, it's the \c code_props
+ * for the LHS symbol of the same rule.)
+ * - \c code_props_translate_code has been invoked for that \c code_props,
+ * but the symbol value associated with this \c code_props was not
+ * referenced in the code passage.
*/
bool is_value_used;
/**
- * \brief
- * The \c symbol_list node associated with this code passage.
- * \invariant
- * - <tt>code_props::rule != NULL</tt> iff \c code_props::kind is
- * \c CODE_PROPS_RULE_ACTION.
+ * \c true iff this code is an action that is not to be deferred in
+ * a non-deterministic parser.
*/
+ bool is_predicate;
+
+ /**
+ * Whether this is actually used (i.e., not completely masked by
+ * other code props). */
+ bool is_used;
+
+ /** \c NULL iff \c code_props::kind is not \c CODE_PROPS_RULE_ACTION. */
struct symbol_list *rule;
+
+ /* Named reference. */
+ named_ref *named_ref;
} code_props;
/**
* \pre
* - <tt>self != NULL</tt>.
* \post
- * - \c self has been overwritten to contain no code. (However, \c self may
- * still be conceptually associated with some passage of code contained
- * elsewhere. Thus, a call on <tt>code_props_is_value_used (*self)</tt>,
- * for example, is still reasonable.)
+ * - \c self has been overwritten to contain no code.
*/
void code_props_none_init (code_props *self);
-/**
- * \brief A \c code_props initializer equivalent to \c code_props_none_init.
- */
-#define CODE_PROPS_NONE_INIT \
- {CODE_PROPS_NONE, NULL, EMPTY_LOCATION_INIT, false, NULL}
-
-/**
- * \brief
- * A \c code_props initialized by \c CODE_PROPS_NONE_INIT with no further
- * modification.
- */
-extern code_props const code_props_none;
+/** Equivalent to \c code_props_none_init. */
+# define CODE_PROPS_NONE_INIT \
+ { \
+ /* .kind = */ CODE_PROPS_NONE, \
+ /* .code = */ NULL, \
+ /* .location = */ EMPTY_LOCATION_INIT, \
+ /* .is_value_used = */ false, \
+ /* .is_predicate = */ false, \
+ /* .is_used = */ false, \
+ /* .rule = */ NULL, \
+ /* .named_ref = */ NULL \
+ }
+
+/** Initialized by \c CODE_PROPS_NONE_INIT with no further modification. */
+extern code_props code_props_none;
/**
* \pre
* \post
* - \c self has been overwritten to represent the specified plain code
* passage.
- * - \c self does not claim responsibility for the memory of \c code.
+ * - \c self will become invalid if the caller frees \c code before invoking
+ * \c code_props_translate_code on \c self.
*/
void code_props_plain_init (code_props *self, char const *code,
location code_loc);
* - <tt>self != NULL</tt>.
* - <tt>code != NULL</tt>.
* - \c code is an untranslated code passage. The only Bison escapes it
- * might contain are \c $$ and \c \@$, referring to a single symbol.
+ * might contain are $$ and \@$, referring to a single symbol.
* - \c code was extracted from the grammar file at \c code_loc.
* \post
* - \c self has been overwritten to represent the specified symbol action.
- * - \c self does not claim responsibility for the memory of \c code.
+ * - \c self will become invalid if the caller frees \c code before invoking
+ * \c code_props_translate_code on \c self.
*/
void code_props_symbol_action_init (code_props *self, char const *code,
location code_loc);
* - <tt>code != NULL</tt>.
* - <tt>rule != NULL</tt>.
* - \c code is the untranslated action of the rule for which \c rule is the
- * LHS node. Thus, \c code possibly contains Bison escapes such as \c $$,
- * \c $1, \c $2, etc referring to the values of the rule.
+ * LHS node. Thus, \c code possibly contains Bison escapes such as $$, $1,
+ * $2, etc referring to the values of the rule.
+ * - \c code was extracted from the grammar file at \c code_loc.
* \post
* - \c self has been overwritten to represent the specified rule action.
- * - \c self does not claim responsibility for the memory of \c code or
- * \c rule.
+ * - \c self does not claim responsibility for the memory of \c rule.
+ * - \c self will become invalid if:
+ * - The caller frees \c code before invoking \c code_props_translate_code
+ * on \c self.
+ * - The caller frees \c rule.
*/
void code_props_rule_action_init (code_props *self, char const *code,
- location code_loc, struct symbol_list *rule);
+ location code_loc, struct symbol_list *rule,
+ named_ref *name, bool is_predicate);
/**
* \pre
* escapes, all grammar declarations have already been parsed as they may
* affect warnings and complaints issued here.
* \post
- * - All M4 special symbols and Bison escapes have been translated in
- * <tt>code_props_code_get (*self)</tt> iff
- * <tt>code_props_code_get (*self \@pre) != NULL</tt>.
+ * - All M4-special symbols and Bison escapes have been translated in
+ * \c self->code.
+ * - <tt>self->code != self->code\@pre</tt> unless
+ * <tt>self->code\@pre = NULL</tt>.
*/
void code_props_translate_code (code_props *self);
-/**
- * \pre
- * - None.
- * \post
- * - \c result = either:
- * - The code passage contained with \c self.
- * - \c NULL if none.
- */
-char const *code_props_code_get (code_props const self);
-
-/**
- * \pre
- * - <tt>code_props_code_get (self) != NULL</tt>.
- * \post
- * - \c result = the grammar file location of
- * <tt>code_props_code_get (self)</tt>.
- */
-location code_props_location_get (code_props const self);
-
-/**
- * \pre
- * - \c self was not previously initialized with \c code_props_plain_init.
- * \post
- * - \c result = either:
- * - \c false if either:
- * - \c code_props_translate_code has never previously been invoked for
- * the \c code_props that would contain the code passage associated
- * with \c self. (If \c self is for a RHS \c symbol_list node, that
- * \c code_props is not \c self. Instead, it's the \c code_props for
- * the LHS symbol of the same rule.)
- * - \c code_props_translate_code has been invoked for that
- * \c code_props, but the symbol value associated with \c self was not
- * referenced in the code passage.
- * - \c true otherwise.
- */
-bool code_props_is_value_used (code_props const self);
-
/**
* \pre
* - None.
* \post
* - The dynamic memory allocated by the previous invocation of
* \c code_props_translate_code (if any) was freed. The \c code_props
- * instance for which that \c code_props_translate_code was invoked is now
+ * instance for which \c code_props_translate_code was invoked is now
* invalid.
*/
void code_scanner_last_string_free (void);
* - None.
* \post
* - All dynamic memory allocated during invocations of
- * \c code_props_translate_code (if any) has been freed. All
- * \c code_props instances and all pointers returned by
- * \c code_props_code_get may now be invalid.
+ * \c code_props_translate_code (if any) has been freed. All \c code_props
+ * instances may now be invalid.
*/
void code_scanner_free (void);
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