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bison/src/bison/2.4.1/bison-2.4.1-src/src/scan-code.h

Index: bison/src/bison/2.4.1/bison-2.4.1-src/src/scan-code.h
===================================================================
--- bison/src/bison/2.4.1/bison-2.4.1-src/src/scan-code.h	(revision 0)
+++ bison/src/bison/2.4.1/bison-2.4.1-src/src/scan-code.h	(revision 0)
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+/* Bison code properties structure and scanner.
+
+   Copyright (C) 2006, 2007 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
+   it under the terms of the GNU General Public License as published by
+   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,
+   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef SCAN_CODE_H_
+# define SCAN_CODE_H_
+
+# include "location.h"
+
+struct symbol_list;
+
+/**
+ * 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;
+
+/**
+ * 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 {
+  /** Set by the init functions.  */
+  enum {
+    CODE_PROPS_NONE, CODE_PROPS_PLAIN,
+    CODE_PROPS_SYMBOL_ACTION, CODE_PROPS_RULE_ACTION
+  } kind;
+
+  /** \c NULL iff \c code_props::kind is \c CODE_PROPS_NONE.  */
+  char const *code;
+  /** Undefined iff \c code_props::code is \c NULL.  */
+  location location;
+
+  /**
+   * \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;
+
+  /** \c NULL iff \c code_props::kind is not \c CODE_PROPS_RULE_ACTION.  */
+  struct symbol_list *rule;
+} code_props;
+
+/**
+ * \pre
+ *   - <tt>self != NULL</tt>.
+ * \post
+ *   - \c self has been overwritten to contain no code.
+ */
+void code_props_none_init (code_props *self);
+
+/** Equivalent to \c code_props_none_init.  */
+#define CODE_PROPS_NONE_INIT \
+  {CODE_PROPS_NONE, NULL, EMPTY_LOCATION_INIT, false, NULL}
+
+/** Initialized by \c CODE_PROPS_NONE_INIT with no further modification.  */
+extern code_props const code_props_none;
+
+/**
+ * \pre
+ *   - <tt>self != NULL</tt>.
+ *   - <tt>code != NULL</tt>.
+ *   - \c code is an untranslated code passage containing no Bison escapes.
+ *   - \c code was extracted from the grammar file at \c code_loc.
+ * \post
+ *   - \c self has been overwritten to represent the specified plain code
+ *     passage.
+ *   - \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);
+
+/**
+ * \pre
+ *   - <tt>self != NULL</tt>.
+ *   - <tt>code != NULL</tt>.
+ *   - \c code is an untranslated code passage.  The only Bison escapes it
+ *     might contain are $$ and \@$, referring to a single symbol.
+ *   - \c code was extracted from the grammar file at \c code_loc.
+ * \post
+ *   - \c self has been overwritten to represent the specified symbol action.
+ *   - \c self will become invalid if the caller frees \c code before invoking
+ *     \c code_props_translate_code on \c self.
+ */
+void code_props_symbol_action_init (code_props *self, char const *code,
+                                    location code_loc);
+
+/**
+ * \pre
+ *   - <tt>self != NULL</tt>.
+ *   - <tt>code != NULL</tt>.
+ *   - <tt>rule != NULL</tt>.
+ *   - \c code is the untranslated action of the rule for which \c rule is the
+ *     LHS node.  Thus, \c code possibly contains Bison escapes such as $$, $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 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);
+
+/**
+ * \pre
+ *   - If there's a code passage contained in \c self and it contains Bison
+ *     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
+ *     \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
+ *   - 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 \c code_props_translate_code was invoked is now
+ *     invalid.
+ */
+void code_scanner_last_string_free (void);
+
+/**
+ * \pre
+ *   - None.
+ * \post
+ *   - All dynamic memory allocated during invocations of
+ *     \c code_props_translate_code (if any) has been freed.  All \c code_props
+ *     instances may now be invalid.
+ */
+void code_scanner_free (void);
+
+#endif /* !SCAN_CODE_H_ */
Property changes on: bison\src\bison\2.4.1\bison-2.4.1-src\src\scan-code.h
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