cgana.c 24.5 KB
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/*
 * Project:     libFIRM
 * File name:   ir/ana/cgana.c
 * Purpose:     Intraprozedural analyses to estimate the call graph.
 * Author:      Hubert Schmid
 * Modified by:
 * Created:     09.06.2002
 * CVS-ID:      $Id$
 * Copyright:   (c) 1999-2003 Universitt Karlsruhe
 * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
 */

/**
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 * Intraprozedurale Analyse zur Abschtzung der Aufrufrelation. Es
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 * wird eine Menge von freien Methoden und anschlieend die an den
 * Call-Operationen aufrufbaren Methoden bestimmt.
 *
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 */
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
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#include <stdlib.h>
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#include "cgana.h"
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#include "rta.h"
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#include "eset.h"
#include "pmap.h"
#include "array.h"
#include "irprog.h"
#include "irgwalk.h"
#include "ircons.h"
#include "irgmod.h"
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#include "irnode_t.h"
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#include "irflag_t.h"
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#include "dbginfo_t.h"

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/* Eindeutige Adresse zur Markierung von besuchten Knoten und zur
 * Darstellung der unbekannten Methode. */
static void * MARK = &MARK;



/* --- sel methods ---------------------------------------------------------- */


static eset * entities = NULL;


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/** Bestimmt die eindeutige Methode, die die Methode fr den
 * bergebenen (dynamischen) Typ berschreibt. */
static entity * get_implementation(type * class, entity * method) {
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  int i;
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  if (get_entity_peculiarity(method) != peculiarity_description &&
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      get_entity_owner(method) == class) {
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    return method;
  }
  for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i) {
    entity * e = get_entity_overwrittenby(method, i);
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    if (get_entity_peculiarity(e) != peculiarity_description && get_entity_owner(e) == class) {
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      return e;
    }
  }
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  for (i = get_class_n_supertypes(class) - 1; i >= 0; --i) {
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    entity * e = get_implementation(get_class_supertype(class, i), method);
    if (e) {
      return e;
    }
  }
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  assert(0 && "implementation not found");
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  return NULL;
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}

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/** Returns the entity that contains the implementation of the inherited
    entity if available, else returns the entity passed. */
static entity *get_inherited_methods_implementation(entity *inh_meth) {
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  entity *impl_meth = NULL;
  ir_node *addr = get_atomic_ent_value(inh_meth);
  assert(addr && "constant entity without value");

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  if (get_irn_op(addr) == op_Const) {
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    impl_meth = tarval_to_entity(get_Const_tarval(addr));
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  } else {
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    assert(0 && "Complex constant values not supported -- address of method should be straight constant!");
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  }
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  if (impl_meth && (get_entity_peculiarity(impl_meth) != peculiarity_existent)) {
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    /*
      printf("this_meth: "); DDMEO(inh_meth);
      printf("impl meth: "); DDMEO(impl_meth);
      assert(!impl_meth || get_entity_peculiarity(impl_meth) == peculiarity_existent);
    */
    impl_meth = NULL;
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  }
  return impl_meth? impl_meth : inh_meth;
}

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/** Collect the entity representing the implementation of this
 *  entity (not the same if inherited) and all entities for overwriting
 *  implementations in "set".
 *  If the implementation of the method is not included in the
 *  compilation unit "open" is set to true.
 *  A recursive descend in the overwritten relation.
 *  Cycle-free, therefore must terminate.
 *
 * @param method
 * @param set      A set of entities.
 * @param size     Number of entities in set.
 * @param open
 */
static void collect_impls(entity *method, eset *set, int *size, bool *open) {
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  int i;
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  if (get_entity_peculiarity(method) == peculiarity_existent) {
    if (get_entity_visibility(method) == visibility_external_allocated) {
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      assert(get_entity_irg(method) == NULL);
      *open = true;
    } else {
      assert(get_entity_irg(method) != NULL);
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      if (!eset_contains(set, method)) {
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        eset_insert(set, method);
        ++(*size);
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      }
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    }
  }
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  if (get_entity_peculiarity(method) == peculiarity_inherited) {
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    entity *impl_ent = get_inherited_methods_implementation(method);
    assert(impl_ent && "no implementation for inherited entity");
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    if (get_entity_visibility(impl_ent) == visibility_external_allocated) {
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      assert(get_entity_irg(impl_ent) == NULL);
      *open = true;
    } else {
      assert(get_entity_irg(impl_ent) != NULL);
      if (!eset_contains(set, impl_ent)) {
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        eset_insert(set, impl_ent);
        ++(*size);
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      }
    }
  }
  /** recursive descend **/
  for (i = get_entity_n_overwrittenby(method) - 1; i >= 0; --i)
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    collect_impls(get_entity_overwrittenby(method, i), set, size, open);
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}

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/** Alle Methoden bestimmen, die die bergebene Methode berschreiben
 *  (und implementieren). In der zurckgegebenen Reihung kommt jede
 *  Methode nur einmal vor. Der Wert 'NULL' steht fr unbekannte
 *  (externe) Methoden. Die zurckgegebene Reihung mu vom Aufrufer
 *  wieder freigegeben werden (siehe "DEL_ARR_F"). Gibt es berhaupt
 *  keine Methoden, die "method" berschreiben, so gibt die Methode
 *  "NULL" zurck.
 *
 *  @param method
 */
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static entity ** get_impl_methods(entity * method) {
  eset * set = eset_create();
  int size = 0;
  entity ** arr;
  bool open = false;
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  /* Collect all method entities that can be called here */
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  collect_impls(method, set, &size, &open);

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  /* Vorgaenger einfuegen. */
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  if (size == 0 && !open) {
    /* keine implementierte berschriebene Methode */
    arr = NULL;
  } else if (open) {
    entity * ent;
    arr = NEW_ARR_F(entity *, size + 1);
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    arr[0] = NULL;  /* Represents open method */
    for (ent = eset_first(set); size > 0; ent = eset_next(set), --size)
      arr[size] = ent;
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  } else {
    entity * ent;
    arr = NEW_ARR_F(entity *, size);
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    for (size -= 1, ent = eset_first(set); size >= 0; ent = eset_next(set), --size)
      arr[size] = ent;
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  }
  eset_destroy(set);
  return arr;
}


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/* debug makros used in sel_methods_walker */
#define SIZ(x)    sizeof(x)/sizeof((x)[0])

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#define DBG_OPT_NORMALIZE                                                      \
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      __dbg_info_merge_pair(new_node, node, dbg_const_eval)
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#define DBG_OPT_POLY_ALLOC                                                     \
  do {                                                                         \
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    ir_node *ons[2];                                                       \
    ons[0] = node;                                                         \
    ons[1] = skip_Proj(get_Sel_ptr(node));                                 \
    __dbg_info_merge_sets(&new_node, 1, ons, SIZ(ons), dbg_rem_poly_call); \
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     } while(0)
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#define DBG_OPT_POLY                                                           \
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      __dbg_info_merge_pair(new_node, node, dbg_rem_poly_call)
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/** Analyse address computations.
 *
 *  - If the node is a SymConst replace it by Const(ent) if possible.
 *  - If the node is a Sel:
 *    * If the pointer to the Sel comes directly from an Alloc node
 *      replace the Sel by a Const(ent).
 *
 *
 *  @param node The node to analyze
 *  @param ldname_map A map that mapps names of entities to the entities.
 */
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static void sel_methods_walker(ir_node * node, pmap * ldname_map) {
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  if (get_irn_op(node) == op_SymConst) {
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    /* Wenn mglich SymConst-Operation durch Const-Operation
     * ersetzen. */
    if (get_SymConst_kind(node) == linkage_ptr_info) {
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      pmap_entry *entry = pmap_find(ldname_map, (void *) get_SymConst_ptrinfo(node));
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      if (entry != NULL) { /* Method is declared in the compiled code */
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        entity *ent = entry->value;
        if (get_opt_normalize() && (get_entity_visibility(ent) != visibility_external_allocated)) {
	  /* Meth. is defined */
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          ir_node *new_node;
          assert(get_entity_irg(ent));
          set_irg_current_block(current_ir_graph, get_nodes_Block(node));
          new_node = new_d_Const(get_irn_dbg_info(node),
                                 mode_P_mach, new_tarval_from_entity(ent, mode_P_mach));       DBG_OPT_NORMALIZE;
          exchange(node, new_node);
        }
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      }
    }
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  } else if (get_irn_op(node) == op_Sel &&
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             is_method_type(get_entity_type(get_Sel_entity(node)))) {
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    entity * ent = get_Sel_entity(node);
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    if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
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        (get_irn_op(skip_Proj(get_Sel_ptr(node))) == op_Alloc)) {
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      ir_node *new_node;
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      entity *called_ent;
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      /* We know which method will be called, no dispatch necessary. */
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#if 0
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      assert(get_entity_peculiarity(ent) != peculiarity_description);
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      set_irg_current_block(current_ir_graph, get_nodes_Block(node));
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      /* @@@ Is this correct?? Alloc could reference a subtype of the owner
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         of Sel that overwrites the method referenced in Sel. */
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      /* @@@ Yes, this is wrong. GL, 10.3.04 */
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      new_node = copy_const_value(get_atomic_ent_value(ent));              DBG_OPT_POLY_ALLOC;
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#else
      called_ent = resolve_ent_polymorphy(get_Alloc_type(skip_Proj(get_Sel_ptr(node))), ent);
      set_irg_current_block(current_ir_graph, get_nodes_Block(node));
      /* called_ent may not be description: has no Address/Const to Call! */
      assert(get_entity_peculiarity(called_ent) != peculiarity_description);
      new_node = copy_const_value(get_atomic_ent_value(called_ent));       DBG_OPT_POLY_ALLOC;
#endif
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      exchange (node, new_node);
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    } else {
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      assert(get_entity_peculiarity(ent) != peculiarity_inherited);
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      if (!eset_contains(entities, ent)) {
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        /* Entity noch nicht behandelt. Alle (intern oder extern)
         * implementierten Methoden suchen, die diese Entity
         * berschreiben. Die Menge an entity.link speichern. */
        set_entity_link(ent, get_impl_methods(ent));
        eset_insert(entities, ent);
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      }
      if (get_entity_link(ent) == NULL) {
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        /* Die Sel-Operation kann nie einen Zeiger auf eine aufrufbare
         * Methode zurckgeben. Damit ist sie insbesondere nicht
         * ausfhrbar und nicht erreichbar. */
        /* Gib eine Warnung aus wenn die Entitaet eine Beschreibung ist
           fuer die es keine Implementierung gibt. */
        if (get_entity_peculiarity(ent) == peculiarity_description) {
          /* @@@ GL Methode um Fehler anzuzeigen aufrufen! */
          printf("WARNING: Calling method description %s\n  in method %s\n  of class %s\n  which has "
                 "no implementation!\n", get_entity_name(ent),
                 get_entity_name(get_irg_ent(current_ir_graph)),
                 get_type_name(get_entity_owner(get_irg_ent(current_ir_graph))));
          printf("This happens when compiling a Java Interface that's never really used, i.e., "
                 "no class implementing the interface is ever used.\n");
        } else {
          exchange(node, new_Bad());
        }
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      } else {
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        entity ** arr = get_entity_link(ent);
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#if 0
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        int i;
        printf("\nCall site "); DDMN(node);
        printf("  in "); DDME(get_irg_ent(current_ir_graph));
        printf("  can call:\n");
        for (i = 0; i < ARR_LEN(arr); i++) {
          printf("   - "); DDME(arr[i]);
          printf("     with owner "); DDMT(get_entity_owner(arr[i]));
        }
        printf("\n");
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#endif

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        if (get_opt_optimize() && get_opt_dyn_meth_dispatch() &&
            (ARR_LEN(arr) == 1 && arr[0] != NULL)) {
          ir_node *new_node;
          /* Die Sel-Operation kann immer nur einen Wert auf eine
           * interne Methode zurckgeben. Wir knnen daher die
           * Sel-Operation durch eine Const- bzw. SymConst-Operation
           * ersetzen. */
          set_irg_current_block(current_ir_graph, get_nodes_Block(node));
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          /* assert(get_entity_peculiarity(tarval_to_entity(get_Const_tarval(get_atomic_ent_value(arr[0])))) == peculiarity_existent); */
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          new_node = copy_const_value(get_atomic_ent_value(arr[0]));         DBG_OPT_POLY;
          exchange (node, new_node);
        }
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      }
    }
  }
}


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/** Datenstruktur initialisieren. Zustzlich werden alle
 *  SymConst-Operationen, die auf interne Methoden verweisen, durch
 *  Const-Operationen ersetzt. */
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static void sel_methods_init(void) {
  int i;
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  pmap * ldname_map = pmap_create();   /* Map entitiy names to entities: to replace SymConst by Const(ent). */
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  assert(entities == NULL);
  entities = eset_create();
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
    entity * ent = get_irg_ent(get_irp_irg(i));
    /* Nur extern sichtbare Methode knnen berhaupt mit SymConst
     * aufgerufen werden. */
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    if (get_entity_visibility(ent) != visibility_local) {
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      pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
    }
  }
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  all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
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  pmap_destroy(ldname_map);
}

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/*****************************************************************************/
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/* Datenstruktur freigeben. */
static void sel_methods_dispose(void) {
  entity * ent;
  assert(entities);
  for (ent = eset_first(entities); ent; ent = eset_next(entities)) {
    entity ** arr = get_entity_link(ent);
    if (arr) {
      DEL_ARR_F(arr);
    }
    set_entity_link(ent, NULL);
  }
  eset_destroy(entities);
  entities = NULL;
}


/* Gibt die Menge aller Methoden zurck, die an diesem Sel-Knoten
 * zurckgegeben werden knnen. Die Liste enthlt keine doppelten
 * Eintrge. */
static entity ** get_Sel_arr(ir_node * sel) {
  static entity ** NULL_ARRAY = NULL;
  entity * ent;
  entity ** arr;
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  assert(sel && get_irn_op(sel) == op_Sel);
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  ent = get_Sel_entity(sel);
  assert(is_method_type(get_entity_type(ent))); /* what else? */
  arr = get_entity_link(ent);
  if (arr) {
    return arr;
  } else {
    /* "NULL" zeigt an, dass keine Implementierung existiert. Dies
     * kann fr polymorphe (abstrakte) Methoden passieren. */
    if (!NULL_ARRAY) {
      NULL_ARRAY = NEW_ARR_F(entity *, 0);
    }
    return NULL_ARRAY;
  }
}


static int get_Sel_n_methods(ir_node * sel) {
  return ARR_LEN(get_Sel_arr(sel));
}


static entity * get_Sel_method(ir_node * sel, int pos) {
  entity ** arr = get_Sel_arr(sel);
  assert(pos >= 0 && pos < ARR_LEN(arr));
  return arr[pos];
}



/* --- callee analysis ------------------------------------------------------ */


static void callee_ana_node(ir_node * node, eset * methods);


static void callee_ana_proj(ir_node * node, long n, eset * methods) {
  assert(get_irn_mode(node) == mode_T);
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);

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  switch (get_irn_opcode(node)) {
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  case iro_Proj: {
    /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
     * op_Tuple oder ein Knoten, der eine "freie Methode"
     * zurckgibt. */
    ir_node * pred = get_Proj_pred(node);
    if (get_irn_link(pred) != MARK) {
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      if (get_irn_op(pred) == op_Tuple) {
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    callee_ana_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, methods);
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      } else {
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    eset_insert(methods, MARK); /* free method -> unknown */
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      }
    }
    break;
  }

  case iro_Tuple:
    callee_ana_node(get_Tuple_pred(node, n), methods);
    break;

  case iro_Id:
    callee_ana_proj(get_Id_pred(node), n, methods);
    break;

  default:
    eset_insert(methods, MARK); /* free method -> unknown */
    break;
  }

  set_irn_link(node, NULL);
}


static void callee_ana_node(ir_node * node, eset * methods) {
  int i;

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  assert(mode_is_reference(get_irn_mode(node)) || is_Bad(node));
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  /* rekursion verhindern */
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);

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  switch (get_irn_opcode(node)) {
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  case iro_SymConst:
    /* externe Methode (wegen fix_symconst!) */
    eset_insert(methods, MARK); /* free method -> unknown */
    break;

  case iro_Const: {
    /* interne Methode */
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    entity * ent = tarval_to_entity(get_Const_tarval(node));
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    assert(ent && is_method_type(get_entity_type(ent)));
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    if (get_entity_visibility(ent) != visibility_external_allocated) {
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      assert(get_entity_irg(ent));
      eset_insert(methods, ent);
    } else {
      eset_insert(methods, MARK); /* free method -> unknown */
    }
    break;
  }

  case iro_Sel:
    /* polymorphe Methode */
    for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
      entity * ent = get_Sel_method(node, i);
      if (ent) {
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        eset_insert(methods, ent);
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      } else {
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        eset_insert(methods, MARK);
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      }
    }
    break;

  case iro_Bad:
    /* nothing */
    break;

  case iro_Phi: /* Vereinigung */
    for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
      callee_ana_node(get_Phi_pred(node, i), methods);
    }
    break;

  case iro_Id:
    callee_ana_node(get_Id_pred(node), methods);
    break;

  case iro_Proj:
    callee_ana_proj(get_Proj_pred(node), get_Proj_proj(node), methods);
    break;

  case iro_Add:
  case iro_Sub:
  case iro_Conv:
    /* extern */
    eset_insert(methods, MARK); /* free method -> unknown */
    break;

  default:
    assert(0 && "invalid opcode or opcode not implemented");
    break;
  }

  set_irn_link(node, NULL);
}


static void callee_walker(ir_node * call, void * env) {
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  if (get_irn_op(call) == op_Call) {
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    eset * methods = eset_create();
    entity * ent;
    entity ** arr = NEW_ARR_F(entity *, 0);
    callee_ana_node(skip_nop(get_Call_ptr(call)), methods);
    if (eset_contains(methods, MARK)) { /* unknown method */
      ARR_APP1(entity *, arr, NULL);
    }
    for (ent = eset_first(methods); ent; ent = eset_next(methods)) {
      if (ent != MARK) {
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    ARR_APP1(entity *, arr, ent);
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      }
    }
    if (ARR_LEN(arr) == 0) {
      /* Kann vorkommen, wenn der Vorgnger beispielsweise eine
       * Sel-Operation war, die keine Methoden zurckgeben
       * konnte. Wir ersetzen die Call-Operation ebenfalls durch
       * eine Bad-Operation. Die Verlinkung muss wiederhergestellt
       * werden! */
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      /* exchange(call, new_Bad());  invalid firm */

      ir_node *mem = get_Call_mem(call);
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      turn_into_tuple (call, 5 /* pn_Call_max */);
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      set_Tuple_pred(call, pn_Call_M_regular       , mem);
      set_Tuple_pred(call, pn_Call_T_result        , new_Bad());
      set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
      set_Tuple_pred(call, pn_Call_X_except        , new_Bad());  /* new_Jmp() ?? new_Raise() ?? */
      set_Tuple_pred(call, pn_Call_M_except        , mem);

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    } else {
      set_Call_callee_arr(call, ARR_LEN(arr), arr);
    }
    DEL_ARR_F(arr);
    eset_destroy(methods);
  }
}


/* Bestimmt fr jede Call-Operation die Menge der aufrufbaren Methode
 * und speichert das Ergebnis in der Call-Operation. (siehe
 * "set_Call_callee"). "sel_methods" wird fr den Aufbau bentigt und
 * muss bereits aufgebaut sein. */
static void callee_ana(void) {
  int i;
  /* Alle Graphen analysieren. */
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
    irg_walk_graph(get_irp_irg(i), callee_walker, NULL, NULL);
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    set_irg_callee_info_state(get_irp_irg(i), irg_callee_info_consistent);
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  }
}



/* --- free method analysis ------------------------------------------------- */


static void free_mark(ir_node * node, eset * set);

static void free_mark_proj(ir_node * node, long n, eset * set) {
  assert(get_irn_mode(node) == mode_T);
  if (get_irn_link(node) == MARK) {
    /* already visited */
    return;
  }
  set_irn_link(node, MARK);
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  switch (get_irn_opcode(node)) {
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  case iro_Proj: {
    /* proj_proj: in einem "sinnvollen" Graphen kommt jetzt ein
     * op_Tuple oder ein Knoten, der in "free_ana_walker" behandelt
     * wird. */
    ir_node * pred = get_Proj_pred(node);
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    if (get_irn_link(pred) != MARK && get_irn_op(pred) == op_Tuple) {
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      free_mark_proj(get_Tuple_pred(pred, get_Proj_proj(node)), n, set);
    } else {
      /* nothing: da in "free_ana_walker" behandelt. */
    }
    break;
  }

  case iro_Tuple:
    free_mark(get_Tuple_pred(node, n), set);
    break;

  case iro_Id:
    free_mark_proj(get_Id_pred(node), n, set);
    break;

  case iro_Start:
  case iro_Alloc:
  case iro_Load:
    /* nothing: Die Operationen werden in "free_ana_walker" selbst
     * behandelt. */
    break;

  default:
    assert(0 && "unexpected opcode or opcode not implemented");
    break;
  }
  set_irn_link(node, NULL);
}


static void free_mark(ir_node * node, eset * set) {
  int i;
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  assert(mode_is_reference(get_irn_mode(node)));
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  if (get_irn_link(node) == MARK) {
    return; /* already visited */
  }
  set_irn_link(node, MARK);
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  switch (get_irn_opcode(node)) {
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  case iro_Sel: {
    entity * ent = get_Sel_entity(node);
    if (is_method_type(get_entity_type(ent))) {
      for (i = get_Sel_n_methods(node) - 1; i >= 0; --i) {
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    eset_insert(set, get_Sel_method(node, i));
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      }
    }
    break;
  }
  case iro_SymConst:
    /* nothing: SymConst points to extern method */
    break;
  case iro_Const: {
    tarval * val = get_Const_tarval(node);
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    if (tarval_is_entity(val)) { /* filter null pointer */
      entity * ent = tarval_to_entity(val);
      if (is_method_type(get_entity_type(ent))) {
        eset_insert(set, ent);
      }
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    }
    break;
  }
  case iro_Phi:
    for (i = get_Phi_n_preds(node) - 1; i >= 0; --i) {
      free_mark(get_Phi_pred(node, i), set);
    }
    break;
  case iro_Id:
    free_mark(get_Id_pred(node), set);
    break;
  case iro_Proj:
    free_mark_proj(get_Proj_pred(node), get_Proj_proj(node), set);
    break;
  default:
    /* nothing: Wird unten behandelt! */
    break;
  }
  set_irn_link(node, NULL);
}


static void free_ana_walker(ir_node * node, eset * set) {
  int i;
  if (get_irn_link(node) == MARK) {
    /* bereits in einem Zyklus besucht. */
    return;
  }
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  switch (get_irn_opcode(node)) {
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  /* special nodes */
  case iro_Sel:
  case iro_SymConst:
  case iro_Const:
  case iro_Phi:
  case iro_Id:
  case iro_Proj:
  case iro_Tuple:
    /* nothing */
    break;
  /* Sonderbehandlung, da der Funktionszeigereingang natrlich kein
   * Verrter ist. */
  case iro_Call:
    set_irn_link(node, MARK);
    for (i = get_Call_arity(node) - 1; i >= 0; --i) {
      ir_node * pred = get_Call_param(node, i);
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      if (mode_is_reference(get_irn_mode(pred))) {
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    free_mark(pred, set);
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      }
    }
    break;
  /* other nodes: Alle anderen Knoten nehmen wir als Verrter an, bis
   * jemand das Gegenteil implementiert. */
  default:
    set_irn_link(node, MARK);
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    for (i = get_irn_arity(node) - 1; i >= 0; --i) {
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      ir_node * pred = get_irn_n(node, i);
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      if (mode_is_reference(get_irn_mode(pred))) {
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    free_mark(pred, set);
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      }
    }
    break;
  }
  set_irn_link(node, NULL);
}


/* Die Datenstrukturen fr sel-Methoden (sel_methods) mu vor dem
 * Aufruf von "get_free_methods" aufgebaut sein. Die (internen)
 * SymConst-Operationen mssen in passende Const-Operationen
 * umgewandelt worden sein, d.h. SymConst-Operationen verweisen immer
 * auf eine echt externe Methode.  */
static entity ** get_free_methods(void) {
  eset * set = eset_create();
  int i;
  entity ** arr = NEW_ARR_F(entity *, 0);
  entity * ent;
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  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
    ir_graph * irg = get_irp_irg(i);
    entity * ent = get_irg_ent(irg);
    /* insert "external visible" methods. */
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    if (get_entity_visibility(ent) != visibility_local) {
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      eset_insert(set, ent);
    }
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    /* Finde alle Methoden die in dieser Methode extern sichtbar werden,
       z.B. da die Adresse einer Methode abgespeichert wird. */
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    irg_walk_graph(irg, NULL, (irg_walk_func *) free_ana_walker, set);
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  }
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  /* Hauptprogramm ist auch dann frei, wenn es nicht "external
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   * visible" ist. */
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  if (get_irp_main_irg()) {
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    eset_insert(set, get_irg_ent(get_irp_main_irg()));
  }
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  /* Wandle Menge in Feld um.  Effizienter. */
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  for (ent = eset_first(set); ent; ent = eset_next(set)) {
    ARR_APP1(entity *, arr, ent);
  }
  eset_destroy(set);

  return arr;
}

void cgana(int *length, entity ***free_methods) {
  entity ** free_meths;
  int i;

  sel_methods_init();
  free_meths = get_free_methods();
  callee_ana();
  sel_methods_dispose();

  /* Convert the flexible array to an array that can be handled
     by standard C. */
  *length = ARR_LEN(free_meths);
  *free_methods = (entity **)malloc(sizeof(entity *) * (*length));
  for (i = 0; i < (*length); i++) (*free_methods)[i] = free_meths[i];
  DEL_ARR_F(free_meths);
}
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/* Optimize the address expressions passed to call nodes.
 * Alle SymConst-Operationen, die auf interne Methoden verweisen,
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 * werden durch Const-Operationen ersetzt.
 * Sel Knoten deren entitaeten nicht ueberschrieben werden, werden
 * durch Const ersetzt.
 * Sel Knoten, fuer die keine Implementierung existiert, werden
 * durch Bad ersetzt. */
void opt_call_addrs(void) {
  sel_methods_init();
  sel_methods_dispose();
#if 0
  int i;
  pmap * ldname_map = pmap_create();
  assert(entities == NULL);
  entities = eset_create();
  for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
    entity * ent = get_irg_ent(get_irp_irg(i));
    /* Nur extern sichtbare Methoden knnen berhaupt mit SymConst
     * aufgerufen werden. */
    if (get_entity_visibility(ent) != local) {
      pmap_insert(ldname_map, (void *) get_entity_ld_ident(ent), ent);
    }
  }
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  all_irg_walk((irg_walk_func *) sel_methods_walker, NULL, ldname_map);
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  pmap_destroy(ldname_map);
#endif
}