contrib/gcc-4.1/gcc/ipa-reference.h

   1 /* IPA handling of references.
   2    Copyright (C) 2004-2005 Free Software Foundation, Inc.
   3    Contributed by Kenneth Zadeck <zadeck@naturalbridge.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  22 #ifndef GCC_IPA_REFERENCE_H
  23 #define GCC_IPA_REFERENCE_H
  24 #include "bitmap.h"
  25 #include "tree.h"
  26
  27 /* The static variables defined within the compilation unit that are
  28    loaded or stored directly by function that owns this structure.  */
  29
  30 struct ipa_reference_local_vars_info_d
  31 {
  32   bitmap statics_read;
  33   bitmap statics_written;
  34
  35   /* Set when this function calls another function external to the
  36      compilation unit or if the function has a asm clobber of memory.
  37      In general, such calls are modeled as reading and writing all
  38      variables (both bits on) but sometime there are attributes on the
  39      called function so we can do better.  */
  40   bool calls_read_all;
  41   bool calls_write_all;
  42 };
  43
  44 struct ipa_reference_global_vars_info_d
  45 {
  46   bitmap statics_read;
  47   bitmap statics_written;
  48   bitmap statics_not_read;
  49   bitmap statics_not_written;
  50 };
  51
  52 /* Statics that are read and written by some set of functions. The
  53    local ones are based on the loads and stores local to the function.
  54    The global ones are based on the local info as well as the
  55    transitive closure of the functions that are called.  The
  56    structures are separated to allow the global structures to be
  57    shared between several functions since every function within a
  58    strongly connected component will have the same information.  This
  59    sharing saves both time and space in the computation of the vectors
  60    as well as their translation from decl_uid form to ann_uid
  61    form.  */
  62
  63 typedef struct ipa_reference_local_vars_info_d *ipa_reference_local_vars_info_t;
  64 typedef struct ipa_reference_global_vars_info_d *ipa_reference_global_vars_info_t;
  65
  66 struct ipa_reference_vars_info_d
  67 {
  68   ipa_reference_local_vars_info_t local;
  69   ipa_reference_global_vars_info_t global;
  70 };
  71
  72 typedef struct ipa_reference_vars_info_d *ipa_reference_vars_info_t;
  73
  74 /* In ipa-reference.c  */
  75 bitmap ipa_reference_get_read_local (tree fn);
  76 bitmap ipa_reference_get_written_local (tree fn);
  77 bitmap ipa_reference_get_read_global (tree fn);
  78 bitmap ipa_reference_get_written_global (tree fn);
  79 bitmap ipa_reference_get_not_read_global (tree fn);
  80 bitmap ipa_reference_get_not_written_global (tree fn);
  81
  82 #endif  /* GCC_IPA_REFERENCE_H  */
  83