nsz Git - libfirm/blob - ir/opt/opt_calling_conv.c

   1 /*
   2  * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
   3  *
   4  * This file is part of libFirm.
   5  *
   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.
  10  *
  11  * Licensees holding valid libFirm Professional Edition licenses may use
  12  * this file in accordance with the libFirm Commercial License.
  13  * Agreement provided with the Software.
  14  *
  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
  17  * PURPOSE.
  18  */
  19
  20 /**
  21  * @file
  22  * @brief   Change the calling conventions of "local" methods
  23  * @author  Michael Beck
  24  * @version $Id$
  25  */
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "iroptimize.h"
  31 #include "debug.h"
  32 #include "irnode_t.h"
  33 #include "irgwalk.h"
  34 #include "irmemory.h"
  35
  36 DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
  37
  38 /**
  39  * Copy the calling conventions from the entities to the call type.
  40  */
  41 static void update_calls(ir_node *call, void *env) {
  42         if (is_Call(call)) {
  43                 ir_node *ptr = get_Call_ptr(call);
  44
  45                 if (is_SymConst(ptr)) {
  46                         ir_entity *ent = get_SymConst_entity(ptr);
  47                         ir_type *mtp = get_entity_type(ent);
  48                         ir_type *ctp = get_Call_type(call);
  49                         unsigned cc  = get_method_calling_convention(mtp);
  50
  51                         if (cc != get_method_calling_convention(ctp)) {
  52                                 set_method_calling_convention(ctp, cc);
  53                                 DB((dbg, LEVEL_1, "changed calling convention of calll to %+F\n", ent));
  54                         }
  55                 }
  56         }
  57 }
  58
  59 /**
  60  * Change the calling conventions for all local methods.
  61  *
  62  * @param cc  new calling convention
  63  */
  64 void opt_change_calling_conventions(unsigned cc) {
  65         int i;
  66         int changed = 0;
  67
  68         FIRM_DBG_REGISTER(dbg, "firm.opt.cc");
  69
  70         assure_irp_globals_address_taken_computed();
  71
  72         /* first step: change the calling conventions of the local non-escaped entities */
  73         for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
  74                 ir_graph               *irg = get_irp_irg(i);
  75                 ir_entity              *ent = get_irg_entity(irg);
  76                 ir_address_taken_state state = get_entity_address_taken(ent);
  77
  78                 if (get_entity_visibility(ent) == visibility_local &&
  79                     state == ir_address_not_taken) {
  80                         ir_type *mtp = get_entity_type(ent);
  81
  82                         unsigned new_cc, old_cc = get_method_calling_convention(mtp) & ~cc_bits;
  83
  84                         new_cc = old_cc | (cc & cc_bits);
  85
  86                         if (new_cc != old_cc) {
  87                                 set_method_calling_convention(mtp, new_cc);
  88                                 changed = 1;
  89                                 DB((dbg, LEVEL_1, "changed calling convention of %+F\n", ent));
  90                         }
  91                 }
  92         }
  93
  94         if (changed)
  95                 all_irg_walk(NULL, update_calls, NULL);
  96 }