X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fana%2Fcgana.h;h=fcfbe0a1da8e9b93b22ae374518248c820d87fef;hb=3ea053779e18f3a0a2fcead621f7d610de8531c1;hp=8eadc3562f487f84a6b729469b76c6af7e205fea;hpb=8ec38d4da90f38a8167a9289f3b67145cfe317ea;p=libfirm

diff --git a/ir/ana/cgana.h b/ir/ana/cgana.h
index 8eadc3562..fcfbe0a1d 100644
--- a/ir/ana/cgana.h
+++ b/ir/ana/cgana.h
@@ -1,23 +1,29 @@
-/* -------------------------------------------------------------------
- * $Id$
- * -------------------------------------------------------------------
- * Intraprozedurale Analyse zur Abschaetzung der Aufrulrelation. Es
- * wird eine Menge von freien Methoden und anschliessend die an den
+/*
+ * Project:     libFIRM
+ * File name:   ir/ana/cgana.h
+ * Purpose:     Intraprozedural analyses to estimate the call graph.
+ * Author:      Hubert Schmid
+ * Modified by:
+ * Created:     09.06.2002
+ * CVS-ID:      $Id$
+ * Copyright:   (c) 1999-2003 Universität Karlsruhe
+ * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ */
+
+/**
+ * Intraprozedurale Analyse zur Abschätzung der Aufrulrelation. Es
+ * wird eine Menge von freien Methoden und anschließend die an den
  * Call-Operationen aufrufbaren Methoden bestimmt.
  *
- * Erstellt: Hubert Schmid, 09.06.2002
- * ---------------------------------------------------------------- */
-
+ */
 
 #ifndef _CGANA_H_
 #define _CGANA_H_
 
-
 #include "entity.h"
 
-
 /* Methoden sind "frei", wenn ihr Funktionszeiger (potentiell)
- *"explizit" bekannt ist, d.h.:
+ * "explizit" bekannt ist, d.h.:
  *
  * - die Methode ist von aussen sichtbar (external_visible).
  *
@@ -28,33 +34,53 @@
  *
  * Die main-Methode ist immer in der Menge enthalten.
  *
- * Die Links an den "ir_node"s werden geloescht. */
-
-
+ * Die Links an den "ir_node"s werden geloescht.
+ */
 
 /** Analyses a rough estimation of the possible call graph.
  *
- *  Bestimmt fuer jede Call-Operation die Menge der aufrufbaren Methode
- *  und speichert das Ergebnis in der Call-Operation. (siehe
- *  "set_Call_callee"). Die Methode gibt die Menge der
- *  "freien" Methoden zurueck, die vom Aufrufer wieder freigegeben
- *  werden muss (free).
+ *  Determines for each Call node the set of possibly called methods.
+ *  Stores the result in the field 'callees' of the Call node.  If the
+ *  address can not be analysed, e.g. because it is loaded from a
+ *  variable, the array contains the unknown_entity. (See
+ *  "set_Call_callee"). cgana returns the set of 'free' methods, i.e.,
+ *  the methods that can be called from external or via function
+ *  pointers.  This datastructure must be freed with 'free()' by the
+ *  caller of cgana.
+ *
+ *  cgana sets the callee_info_state of each graph and the program to
+ *  consistent.
+ *
  *  The algorithm implements roughly Static Class Hierarchy Analysis
  *  as described in "Optimization of Object-Oriented Programs Using
  *  Static Class Hierarchy Analysis" by Jeffrey Dean and David Grove
  *  and Craig Chambers.
  *
  *  Performs some optimizations possible by the analysed information:
- *    - Replace SymConst nodes by Const nodes if possible,
- *    - Replace (Sel-method(Alloc)) by Const method,
- *    - Replaces unreachable Sel nodes by Bad  (@@@ was genau meint unreachable?)
- *    - Replaces Sel-method by Const if the Method is never overwritten */
-/*  @@@ I assume this can not be called via JNI :-( -- how to obtain the array pointer? */
+ *    - Replace SymConst-name nodes by SymConst-entity nodes if possible.
+ *    - Replace (Sel-method(Alloc)) by SymConst-entity.
+ *    - Replaces Sel nodes by Bad if there is no implementation for the
+ *         selected entity.
+ *    - Replaces Sel-method by SymConst-entity if the method is never overwritten.
+ *    - Replaces Calls by Tuple containing Bads if callee array is empty
+ *         (there is no implementation to call)
+ *
+ *  Leaves Bad control predecessors in the graph!
+ */
 void cgana(int *len, entity ***free_methods);
 
+/** Free callee information.
+ *
+ *  Sets callee_info_state of the graph passed to none.  Sets callee field
+ *  in all call nodes to NULL.  Else it happens that the field contains
+ *  pointers to other than firm arrays.
+ */
+void free_callee_info(ir_graph *irg);
+void free_irp_callee_info(void);
+
 /* Optimize the address expressions passed to call nodes.
  * Performs only the optimizations done by cgana. */
-/* @@@ move to irgopt ?! */
-/* @@@ not fully implemented as buggy !!!  */
 void opt_call_addrs(void);
+
+
 #endif /* _CGANA_H_ */