X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=ir%2Fopt%2Fopt_confirms.h;h=2afbe7c894b8912994276f4d8f54020e525d6651;hb=abbf9492df1993d211412ba520feb81de0688c2a;hp=e9abd7bbd1dee3280a5c22dfeacf66f6116fcc19;hpb=78ffd186d60f8e98179fb470f58e5223226bc0e3;p=libfirm

diff --git a/ir/opt/opt_confirms.h b/ir/opt/opt_confirms.h
index e9abd7bbd..2afbe7c89 100644
--- a/ir/opt/opt_confirms.h
+++ b/ir/opt/opt_confirms.h
@@ -1,37 +1,39 @@
 /*
- * Project:     libFIRM
- * File name:   ir/opt/opt_confirms.h
- * Purpose:     Optimizations regarding Confirm nodes
- * Author:      Michael Beck
- * Modified by:
- * Created:
- * CVS-ID:      $Id$
- * Copyright:   (c) 1998-2005 Universität Karlsruhe
- * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
  */
-#ifndef _OPT_CONFIRMS_H_
-#define _OPT_CONFIRMS_H_
-
-#include "irnode.h"
 
 /**
- * @file opt_confirms.h
+ * @file
+ * @brief   Optimizations regarding Confirm nodes.
+ * @author  Michael Beck
+ * @version $Id$
  *
  * Optimizations regarding Confirm nodes.
- * These optimiztions are not means to be run from
+ * These optimizations are not means to be run from
  * frontends, they are called from iropt.
  */
+#ifndef FIRM_OPT_CONFIRMS_H
+#define FIRM_OPT_CONFIRMS_H
 
-/**
- * Possible return values of value_classify().
- */
-typedef enum _value_classify {
-  VALUE_UNKNOWN  = 0,   /**< could not classify */
-  VALUE_POSITIVE = 1,   /**< value is positive, i.e. >= 0 */
-  VALUE_NEGATIVE = -1   /**< value is negative, i.e. <= 0 if
-                             no signed zero exists or < 0 else */
-} value_classify;
+#include "firm_types.h"
 
+/** Needed for MSVC to suporess warnings because it doest NOT handle const right. */
+typedef const ir_node *ir_node_cnst_ptr;
 
 /**
  * Check, if the value of a node is != 0.
@@ -39,9 +41,36 @@ typedef enum _value_classify {
  * This is a often needed case, so we handle here Confirm
  * nodes too.
  *
- * @param n  a node representing the value
+ * @param n        a node representing the value
+ * @param confirm  if n is confirmed to be != 0, returns
+ *                 the the Confirm-node, else NULL
+ */
+int value_not_zero(const ir_node *n, ir_node_cnst_ptr *confirm);
+
+/**
+ * Check, if the value of a node cannot represent a NULL pointer.
+ *
+ * - If option sel_based_null_check_elim is enabled, all
+ *   Sel nodes can be skipped.
+ * - A SymConst(entity) is NEVER a NULL pointer
+ * - A Const != NULL is NEVER a NULL pointer
+ * - Confirms are evaluated
+ *
+ * @param n        a node representing the value
+ * @param confirm  if n is confirmed to be != NULL, returns
+ *                 the the Confirm-node, else NULL
+ */
+int value_not_null(const ir_node *n, ir_node_cnst_ptr *confirm);
+
+/**
+ * Possible return values of value_classify().
  */
-int value_not_zero(ir_node *n);
+typedef enum _value_classify_sign {
+	value_classified_unknown  = 0,   /**< could not classify */
+	value_classified_positive = 1,   /**< value is positive, i.e. >= 0 */
+	value_classified_negative = -1   /**< value is negative, i.e. <= 0 if
+	                                      no signed zero exists or < 0 else */
+} value_classify_sign;
 
 /**
  * Check, if the value of a node can be confirmed >= 0 or <= 0,
@@ -50,15 +79,17 @@ int value_not_zero(ir_node *n);
  *
  * @param n  a node representing the value
  */
-value_classify classify_value_sign(ir_node *n);
+value_classify_sign classify_value_sign(ir_node *n);
 
 /**
  * Return the value of a Cmp if one or both predecessors
  * are Confirm nodes.
  *
+ * @param cmp    the compare node that will be evaluated
  * @param left   the left operand of the Cmp
  * @param right  the right operand of the Cmp
+ * @param pnc    the compare relation
  */
-tarval *computed_value_Cmp_Confirm(ir_node *left, ir_node *right, pn_Cmp pnc);
+tarval *computed_value_Cmp_Confirm(ir_node *cmp, ir_node *left, ir_node *right, pn_Cmp pnc);
 
-#endif /* _OPT_CONFIRMS_H_ */
+#endif /* FIRM_OPT_CONFIRMS_H */