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annotate gcc/tree-ssa-alias.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
parents
children b7f97abdc517
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
55
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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1 /* Tree based alias analysis and alias oracle.
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2 Copyright (C) 2008 Free Software Foundation, Inc.
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3 Contributed by Richard Guenther <rguenther@suse.de>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #ifndef TREE_SSA_ALIAS_H
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22 #define TREE_SSA_ALIAS_H
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23
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24 #include "coretypes.h"
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25
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26
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27 /* The points-to solution.
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28
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29 The points-to solution is a union of pt_vars and the abstract
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30 sets specified by the flags. */
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31 struct GTY(()) pt_solution
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32 {
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33 /* Nonzero if points-to analysis couldn't determine where this pointer
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34 is pointing to. */
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35 unsigned int anything : 1;
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36
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37 /* Nonzero if the points-to set includes any global memory. Note that
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38 even if this is zero pt_vars can still include global variables. */
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39 unsigned int nonlocal : 1;
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40
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41 /* Nonzero if the points-to set includes any escaped local variable. */
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42 unsigned int escaped : 1;
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43
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44 /* Nonzero if the points-to set includes 'nothing', the points-to set
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45 includes memory at address NULL. */
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46 unsigned int null : 1;
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47
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48
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49 /* Nonzero if the pt_vars bitmap includes a global variable. */
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50 unsigned int vars_contains_global : 1;
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51
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52 /* Nonzero if the pt_vars bitmap includes a restrict tag variable. */
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53 unsigned int vars_contains_restrict : 1;
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54
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55 /* Set of variables that this pointer may point to. */
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56 bitmap vars;
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57 };
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58
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59
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60 /* Simplified and cached information about a memory reference tree.
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61 Used by the alias-oracle internally and externally in alternate
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62 interfaces. */
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63 typedef struct ao_ref_s
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64 {
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65 /* The original full memory reference tree or NULL_TREE if that is
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66 not available. */
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67 tree ref;
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68
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69 /* The following fields are the decomposed reference as returned
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70 by get_ref_base_and_extent. */
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71 /* The base object of the memory reference or NULL_TREE if all of
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72 the following fields are not yet computed. */
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73 tree base;
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74 /* The offset relative to the base. */
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75 HOST_WIDE_INT offset;
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76 /* The size of the access. */
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77 HOST_WIDE_INT size;
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78 /* The maximum possible extent of the access or -1 if unconstrained. */
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79 HOST_WIDE_INT max_size;
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80
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81 /* The alias set of the access or -1 if not yet computed. */
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82 alias_set_type ref_alias_set;
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83
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84 /* The alias set of the base object or -1 if not yet computed. */
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85 alias_set_type base_alias_set;
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86 } ao_ref;
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87
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88
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89 /* In tree-ssa-alias.c */
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90 extern void ao_ref_init (ao_ref *, tree);
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91 extern void ao_ref_init_from_ptr_and_size (ao_ref *, tree, tree);
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92 extern tree ao_ref_base (ao_ref *);
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93 extern alias_set_type ao_ref_alias_set (ao_ref *);
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94 extern bool ptr_deref_may_alias_global_p (tree);
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95 extern bool refs_may_alias_p (tree, tree);
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96 extern bool refs_may_alias_p_1 (ao_ref *, ao_ref *, bool);
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97 extern bool refs_anti_dependent_p (tree, tree);
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98 extern bool refs_output_dependent_p (tree, tree);
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99 extern bool ref_maybe_used_by_stmt_p (gimple, tree);
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100 extern bool stmt_may_clobber_ref_p (gimple, tree);
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101 extern bool stmt_may_clobber_ref_p_1 (gimple, ao_ref *);
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102 extern tree get_continuation_for_phi (gimple, ao_ref *, bitmap *);
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103 extern void *walk_non_aliased_vuses (ao_ref *, tree,
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104 void *(*)(ao_ref *, tree, void *),
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105 void *(*)(ao_ref *, tree, void *), void *);
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106 extern unsigned int walk_aliased_vdefs (ao_ref *, tree,
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107 bool (*)(ao_ref *, tree, void *),
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108 void *, bitmap *);
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109 extern struct ptr_info_def *get_ptr_info (tree);
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110 extern void dump_alias_info (FILE *);
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111 extern void debug_alias_info (void);
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112 extern void dump_points_to_solution (FILE *, struct pt_solution *);
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113 extern void dump_points_to_info_for (FILE *, tree);
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114 extern void debug_points_to_info_for (tree);
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115 extern void dump_alias_stats (FILE *);
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116
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117
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118 /* In tree-ssa-structalias.c */
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119 extern unsigned int compute_may_aliases (void);
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120 extern void delete_alias_heapvars (void);
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121 extern bool pt_solution_includes_global (struct pt_solution *);
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122 extern bool pt_solution_includes (struct pt_solution *, const_tree);
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123 extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *);
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124 extern bool pt_solutions_same_restrict_base (struct pt_solution *,
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125 struct pt_solution *);
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126 extern void pt_solution_reset (struct pt_solution *);
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127 extern void pt_solution_set (struct pt_solution *, bitmap);
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128 extern void dump_pta_stats (FILE *);
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129
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130
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131 #endif /* TREE_SSA_ALIAS_H */