2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
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13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Intraprozedural analyses to estimate the call graph.
23 * @author Hubert Schmid
26 * Interprocedural analysis to estimate the calling relation.
28 * This analysis computes all entities representing methods that
29 * can be called at a Call node. Further it computes a set of
30 * methods that are 'free', i.e., their adress is handled by
31 * the program directly, or they are visible external.
33 #ifndef FIRM_ANA_CGANA_H
34 #define FIRM_ANA_CGANA_H
36 #include "firm_types.h"
39 /** @addtogroup callgraph
43 /** Analyses a rough estimation of the possible call graph.
45 * Determines for each Call node the set of possibly called methods.
46 * Stores the result in the field 'callees' of the Call node. If the
47 * address can not be analysed, e.g. because it is loaded from a
48 * variable, the array contains the unknown_entity. (See
49 * set_Call_callee()). cgana() returns the set of 'free' methods, i.e.,
50 * the methods that can be called from external or via function
51 * pointers. This datastructure must be freed with 'xfree()' by the
54 * cgana() sets the callee_info_state of each graph and the program to
57 * The algorithm implements roughly Static Class Hierarchy Analysis
58 * as described in "Optimization of Object-Oriented Programs Using
59 * Static Class Hierarchy Analysis" by Jeffrey Dean and David Grove
62 * Performs some optimizations possible by the analysed information:
63 * - Replace SymConst-name nodes by SymConst-entity nodes if possible.
64 * - Replace (Sel-method(Alloc)) by SymConst-entity.
65 * - Replaces Sel-method by SymConst-entity if the method is never overwritten.
67 FIRM_API size_t cgana(ir_entity ***free_methods);
70 * Free callee information.
72 * Sets callee_info_state of the graph passed to none. Sets callee field
73 * in all call nodes to NULL. Else it happens that the field contains
74 * pointers to other than firm arrays.
76 FIRM_API void free_callee_info(ir_graph *irg);
77 FIRM_API void free_irp_callee_info(void);
80 * Optimize the address expressions passed to call nodes.
81 * Performs only the optimizations done by cgana.
83 FIRM_API void opt_call_addrs(void);