gcc/tree-outof-ssa.h

   1 /* Routines for expanding from SSA form to RTL.
   2    Copyright (C) 2009-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #ifndef GCC_TREE_OUTOF_SSA_H
  22 #define GCC_TREE_OUTOF_SSA_H
  23
  24 #include "tree-ssa-live.h"
  25 #include "tree-ssa-ter.h"
  26
  27 /* This structure (of which only a singleton SA exists) is used to
  28    pass around information between the outof-SSA functions, cfgexpand
  29    and expand itself.  */
  30 struct ssaexpand
  31 {
  32   /* The computed partitions of SSA names are stored here.  */
  33   var_map map;
  34
  35   /* For an SSA name version V bit V is set iff TER decided that
  36      its definition should be forwarded.  */
  37   bitmap values;
  38
  39   /* For a partition number I partition_to_pseudo[I] contains the
  40      RTL expression of the allocated space of it (either a MEM or
  41      a pseudos REG).  */
  42   rtx *partition_to_pseudo;
  43
  44   /* If partition I contains an SSA name that has a default def,
  45      bit I will be set in this bitmap.  */
  46   bitmap partition_has_default_def;
  47 };
  48
  49 /* This is the singleton described above.  */
  50 extern struct ssaexpand SA;
  51
  52 /* Returns the RTX expression representing the storage of the outof-SSA
  53    partition that the SSA name EXP is a member of.  */
  54 static inline rtx
  55 get_rtx_for_ssa_name (tree exp)
  56 {
  57   int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
  58   if (SA.map->partition_to_view)
  59     p = SA.map->partition_to_view[p];
  60   gcc_assert (p != NO_PARTITION);
  61   return SA.partition_to_pseudo[p];
  62 }
  63
  64 /* If TER decided to forward the definition of SSA name EXP this function
  65    returns the defining statement, otherwise NULL.  */
  66 static inline gimple
  67 get_gimple_for_ssa_name (tree exp)
  68 {
  69   int v = SSA_NAME_VERSION (exp);
  70   if (SA.values && bitmap_bit_p (SA.values, v))
  71     return SSA_NAME_DEF_STMT (exp);
  72   return NULL;
  73 }
  74
  75 extern bool ssa_is_replaceable_p (gimple stmt);
  76 extern void finish_out_of_ssa (struct ssaexpand *sa);
  77 extern unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
  78 extern void expand_phi_nodes (struct ssaexpand *sa);
  79
  80 #endif /* GCC_TREE_OUTOF_SSA_H */