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annotate gcc/ssaexpand.h @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
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55
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1 /* Routines for expanding from SSA form to RTL.
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2 Copyright (C) 2009 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20
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21 #ifndef _SSAEXPAND_H
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22 #define _SSAEXPAND_H 1
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23
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24 #include "tree-ssa-live.h"
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25
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26 /* This structure (of which only a singleton SA exists) is used to
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27 pass around information between the outof-SSA functions, cfgexpand
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28 and expand itself. */
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29 struct ssaexpand
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30 {
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31 /* The computed partitions of SSA names are stored here. */
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32 var_map map;
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33
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34 /* For an SSA name version V bit V is set iff TER decided that
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35 its definition should be forwarded. */
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36 bitmap values;
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37
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38 /* For a partition number I partition_to_pseudo[I] contains the
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39 RTL expression of the allocated space of it (either a MEM or
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40 a pseudos REG). */
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41 rtx *partition_to_pseudo;
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42
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43 /* If partition I contains an SSA name that has a default def,
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44 bit I will be set in this bitmap. */
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45 bitmap partition_has_default_def;
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46 };
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47
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48 /* This is the singleton described above. */
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49 extern struct ssaexpand SA;
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50
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51 /* Returns the RTX expression representing the storage of the outof-SSA
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52 partition that the SSA name EXP is a member of. */
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53 static inline rtx
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54 get_rtx_for_ssa_name (tree exp)
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55 {
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56 int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
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57 if (SA.map->partition_to_view)
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58 p = SA.map->partition_to_view[p];
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59 gcc_assert (p != NO_PARTITION);
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60 return SA.partition_to_pseudo[p];
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61 }
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62
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63 /* If TER decided to forward the definition of SSA name EXP this function
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64 returns the defining statement, otherwise NULL. */
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65 static inline gimple
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66 get_gimple_for_ssa_name (tree exp)
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67 {
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68 int v = SSA_NAME_VERSION (exp);
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69 if (SA.values && bitmap_bit_p (SA.values, v))
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70 return SSA_NAME_DEF_STMT (exp);
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71 return NULL;
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72 }
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73
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74 /* In tree-outof-ssa.c. */
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75 void finish_out_of_ssa (struct ssaexpand *sa);
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76 unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
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77 void expand_phi_nodes (struct ssaexpand *sa);
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78
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79 #endif