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annotate gcc/tree-ssa-alias.h @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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55
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1 /* Tree based alias analysis and alias oracle.
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2 Copyright (C) 2008-2020 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 /* The points-to solution.
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25
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26 The points-to solution is a union of pt_vars and the abstract
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27 sets specified by the flags. */
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28 struct GTY(()) pt_solution
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29 {
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30 /* Nonzero if points-to analysis couldn't determine where this pointer
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31 is pointing to. */
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32 unsigned int anything : 1;
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33
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34 /* Nonzero if the points-to set includes any global memory. Note that
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35 even if this is zero pt_vars can still include global variables. */
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36 unsigned int nonlocal : 1;
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37
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38 /* Nonzero if the points-to set includes the local escaped solution by
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39 reference. */
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40 unsigned int escaped : 1;
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41
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42 /* Nonzero if the points-to set includes the IPA escaped solution by
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43 reference. */
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44 unsigned int ipa_escaped : 1;
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45
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46 /* Nonzero if the points-to set includes 'nothing', the points-to set
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47 includes memory at address NULL. */
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48 unsigned int null : 1;
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49
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50 /* Nonzero if the vars bitmap includes a variable included in 'nonlocal'. */
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51 unsigned int vars_contains_nonlocal : 1;
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52 /* Nonzero if the vars bitmap includes a variable included in 'escaped'. */
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53 unsigned int vars_contains_escaped : 1;
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54 /* Nonzero if the vars bitmap includes a anonymous heap variable that
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55 escaped the function and thus became global. */
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56 unsigned int vars_contains_escaped_heap : 1;
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57 /* Nonzero if the vars bitmap includes a anonymous variable used to
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58 represent storage pointed to by a restrict qualified pointer. */
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59 unsigned int vars_contains_restrict : 1;
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60 /* Nonzero if the vars bitmap includes an interposable variable. */
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61 unsigned int vars_contains_interposable : 1;
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62
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63 /* Set of variables that this pointer may point to. */
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64 bitmap vars;
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65 };
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66
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67
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68 /* Simplified and cached information about a memory reference tree.
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69 Used by the alias-oracle internally and externally in alternate
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70 interfaces. */
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71 class ao_ref
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72 {
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73 public:
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74 /* The original full memory reference tree or NULL_TREE if that is
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75 not available. */
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76 tree ref;
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77
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78 /* The following fields are the decomposed reference as returned
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79 by get_ref_base_and_extent. */
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80 /* The base object of the memory reference or NULL_TREE if all of
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81 the following fields are not yet computed. */
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82 tree base;
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83 /* The offset relative to the base. */
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84 poly_int64 offset;
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85 /* The size of the access. */
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86 poly_int64 size;
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87 /* The maximum possible extent of the access or -1 if unconstrained. */
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88 poly_int64 max_size;
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89
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90 /* The alias set of the access or -1 if not yet computed. */
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91 alias_set_type ref_alias_set;
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92
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93 /* The alias set of the base object or -1 if not yet computed. */
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94 alias_set_type base_alias_set;
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95
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96 /* Whether the memory is considered a volatile access. */
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97 bool volatile_p;
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98
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99 bool max_size_known_p () const;
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100 };
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101
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102 /* Return true if the maximum size is known, rather than the special -1
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103 marker. */
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104
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105 inline bool
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106 ao_ref::max_size_known_p () const
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107 {
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108 return known_size_p (max_size);
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109 }
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110
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111 /* In tree-ssa-alias.c */
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112 extern void ao_ref_init (ao_ref *, tree);
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113 extern void ao_ref_init_from_ptr_and_size (ao_ref *, tree, tree);
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114 extern tree ao_ref_base (ao_ref *);
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115 extern alias_set_type ao_ref_alias_set (ao_ref *);
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116 extern alias_set_type ao_ref_base_alias_set (ao_ref *);
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117 extern bool ptr_deref_may_alias_global_p (tree);
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118 extern bool ptr_derefs_may_alias_p (tree, tree);
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119 extern bool ptrs_compare_unequal (tree, tree);
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120 extern bool ref_may_alias_global_p (tree);
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121 extern bool ref_may_alias_global_p (ao_ref *);
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122 extern bool refs_may_alias_p (tree, tree, bool = true);
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123 extern bool refs_may_alias_p_1 (ao_ref *, ao_ref *, bool);
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124 extern bool refs_anti_dependent_p (tree, tree);
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125 extern bool refs_output_dependent_p (tree, tree);
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126 extern bool ref_maybe_used_by_stmt_p (gimple *, tree, bool = true);
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127 extern bool ref_maybe_used_by_stmt_p (gimple *, ao_ref *, bool = true);
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128 extern bool stmt_may_clobber_global_p (gimple *);
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129 extern bool stmt_may_clobber_ref_p (gimple *, tree, bool = true);
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130 extern bool stmt_may_clobber_ref_p_1 (gimple *, ao_ref *, bool = true);
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131 extern bool call_may_clobber_ref_p (gcall *, tree);
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132 extern bool call_may_clobber_ref_p_1 (gcall *, ao_ref *);
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133 extern bool stmt_kills_ref_p (gimple *, tree);
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134 extern bool stmt_kills_ref_p (gimple *, ao_ref *);
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135 enum translate_flags
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136 { TR_TRANSLATE, TR_VALUEIZE_AND_DISAMBIGUATE, TR_DISAMBIGUATE };
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137 extern tree get_continuation_for_phi (gimple *, ao_ref *, bool,
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138 unsigned int &, bitmap *, bool,
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139 void *(*)(ao_ref *, tree, void *,
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140 translate_flags *),
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141 void *, translate_flags
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142 = TR_VALUEIZE_AND_DISAMBIGUATE);
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143 extern void *walk_non_aliased_vuses (ao_ref *, tree, bool,
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144 void *(*)(ao_ref *, tree, void *),
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145 void *(*)(ao_ref *, tree, void *,
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146 translate_flags *),
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147 tree (*)(tree), unsigned &, void *);
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148 extern int walk_aliased_vdefs (ao_ref *, tree,
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149 bool (*)(ao_ref *, tree, void *),
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150 void *, bitmap *,
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151 bool *function_entry_reached = NULL,
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152 unsigned int limit = 0);
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153 extern void dump_alias_info (FILE *);
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154 extern void debug_alias_info (void);
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155 extern void dump_points_to_solution (FILE *, struct pt_solution *);
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156 extern void debug (pt_solution &ref);
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157 extern void debug (pt_solution *ptr);
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158 extern void dump_points_to_info_for (FILE *, tree);
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159 extern void debug_points_to_info_for (tree);
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160 extern void dump_alias_stats (FILE *);
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161
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162
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163 /* In tree-ssa-structalias.c */
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164 extern unsigned int compute_may_aliases (void);
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165 extern bool pt_solution_empty_p (const pt_solution *);
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166 extern bool pt_solution_singleton_or_null_p (struct pt_solution *, unsigned *);
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167 extern bool pt_solution_includes_global (struct pt_solution *);
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168 extern bool pt_solution_includes (struct pt_solution *, const_tree);
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169 extern bool pt_solutions_intersect (struct pt_solution *, struct pt_solution *);
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170 extern void pt_solution_reset (struct pt_solution *);
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171 extern void pt_solution_set (struct pt_solution *, bitmap, bool);
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172 extern void pt_solution_set_var (struct pt_solution *, tree);
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173
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174 extern void dump_pta_stats (FILE *);
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175
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176 extern GTY(()) struct pt_solution ipa_escaped_pt;
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177
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178 /* Return true, if the two ranges [POS1, SIZE1] and [POS2, SIZE2]
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179 overlap. SIZE1 and/or SIZE2 can be (unsigned)-1 in which case the
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180 range is open-ended. Otherwise return false. */
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181
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182 static inline bool
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183 ranges_overlap_p (HOST_WIDE_INT pos1,
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184 unsigned HOST_WIDE_INT size1,
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185 HOST_WIDE_INT pos2,
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186 unsigned HOST_WIDE_INT size2)
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187 {
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188 if (size1 == 0 || size2 == 0)
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189 return false;
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190 if (pos1 >= pos2
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191 && (size2 == (unsigned HOST_WIDE_INT)-1
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192 || pos1 < (pos2 + (HOST_WIDE_INT) size2)))
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193 return true;
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194 if (pos2 >= pos1
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195 && (size1 == (unsigned HOST_WIDE_INT)-1
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196 || pos2 < (pos1 + (HOST_WIDE_INT) size1)))
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197 return true;
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198
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199 return false;
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200 }
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201
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202
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203
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204 #endif /* TREE_SSA_ALIAS_H */