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111
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1 /* SSA name expresssons routines
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2 Copyright (C) 2013-2017 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 it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 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 #ifndef GCC_TREE_SSANAMES_H
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21 #define GCC_TREE_SSANAMES_H
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22
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23 /* Aliasing information for SSA_NAMEs representing pointer variables. */
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24
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25 struct GTY(()) ptr_info_def
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26 {
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27 /* The points-to solution. */
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28 struct pt_solution pt;
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29
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30 /* Alignment and misalignment of the pointer in bytes. Together
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31 align and misalign specify low known bits of the pointer.
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32 ptr & (align - 1) == misalign. */
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33
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34 /* When known, this is the power-of-two byte alignment of the object this
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35 pointer points into. This is usually DECL_ALIGN_UNIT for decls and
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36 MALLOC_ABI_ALIGNMENT for allocated storage. When the alignment is not
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37 known, it is zero. Do not access directly but use functions
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38 get_ptr_info_alignment, set_ptr_info_alignment,
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39 mark_ptr_info_alignment_unknown and similar. */
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40 unsigned int align;
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41
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42 /* When alignment is known, the byte offset this pointer differs from the
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43 above alignment. Access only through the same helper functions as align
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44 above. */
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45 unsigned int misalign;
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46 };
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47
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48 /* Value range information for SSA_NAMEs representing non-pointer variables. */
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49
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50 struct GTY ((variable_size)) range_info_def {
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51 /* Minimum, maximum and nonzero bits. */
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52 TRAILING_WIDE_INT_ACCESSOR (min, ints, 0)
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53 TRAILING_WIDE_INT_ACCESSOR (max, ints, 1)
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54 TRAILING_WIDE_INT_ACCESSOR (nonzero_bits, ints, 2)
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55 trailing_wide_ints <3> ints;
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56 };
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57
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58
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59 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
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60 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
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61
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62 #define num_ssa_names (vec_safe_length (cfun->gimple_df->ssa_names))
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63 #define ssa_name(i) ((*cfun->gimple_df->ssa_names)[(i)])
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64
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65 #define FOR_EACH_SSA_NAME(I, VAR, FN) \
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66 for (I = 1; SSANAMES (FN)->iterate (I, &VAR); ++I) \
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67 if (VAR)
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68
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69 /* Sets the value range to SSA. */
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70 extern void set_range_info (tree, enum value_range_type, const wide_int_ref &,
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71 const wide_int_ref &);
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72 extern void set_range_info_raw (tree, enum value_range_type,
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73 const wide_int_ref &,
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74 const wide_int_ref &);
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75 /* Gets the value range from SSA. */
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76 extern enum value_range_type get_range_info (const_tree, wide_int *,
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77 wide_int *);
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78 extern void set_nonzero_bits (tree, const wide_int_ref &);
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79 extern wide_int get_nonzero_bits (const_tree);
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80 extern bool ssa_name_has_boolean_range (tree);
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81 extern void init_ssanames (struct function *, int);
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82 extern void fini_ssanames (struct function *);
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83 extern void ssanames_print_statistics (void);
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84 extern tree make_ssa_name_fn (struct function *, tree, gimple *,
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85 unsigned int version = 0);
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86 extern void release_ssa_name_fn (struct function *, tree);
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87 extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *,
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88 unsigned int *);
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89 extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *);
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90 extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int,
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91 unsigned int);
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92 extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
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93 unsigned int);
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94 extern struct ptr_info_def *get_ptr_info (tree);
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95 extern void set_ptr_nonnull (tree);
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96 extern bool get_ptr_nonnull (const_tree);
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97
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98 extern tree copy_ssa_name_fn (struct function *, tree, gimple *);
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99 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
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100 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple *);
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101 extern void duplicate_ssa_name_range_info (tree, enum value_range_type,
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102 struct range_info_def *);
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103 extern void reset_flow_sensitive_info (tree);
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104 extern void reset_flow_sensitive_info_in_bb (basic_block);
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105 extern void release_defs (gimple *);
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106 extern void replace_ssa_name_symbol (tree, tree);
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107 extern void flush_ssaname_freelist (void);
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108
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109
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110 /* Return an SSA_NAME node for variable VAR defined in statement STMT
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111 in function cfun. */
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112
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113 static inline tree
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114 make_ssa_name (tree var, gimple *stmt = NULL)
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115 {
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116 return make_ssa_name_fn (cfun, var, stmt);
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117 }
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118
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119 /* Return an SSA_NAME node using the template SSA name NAME defined in
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120 statement STMT in function cfun. */
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121
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122 static inline tree
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123 copy_ssa_name (tree var, gimple *stmt = NULL)
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124 {
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125 return copy_ssa_name_fn (cfun, var, stmt);
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126 }
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127
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128 /* Creates a duplicate of a SSA name NAME tobe defined by statement STMT
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129 in function cfun. */
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130
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131 static inline tree
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132 duplicate_ssa_name (tree var, gimple *stmt)
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133 {
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134 return duplicate_ssa_name_fn (cfun, var, stmt);
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135 }
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136
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137 /* Release the SSA name NAME used in function cfun. */
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138
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139 static inline void
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140 release_ssa_name (tree name)
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141 {
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142 release_ssa_name_fn (cfun, name);
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143 }
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144
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145 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
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146 in function cfun. Arrange so that it uses NAME in dumps. */
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147
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148 static inline tree
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149 make_temp_ssa_name (tree type, gimple *stmt, const char *name)
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150 {
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151 tree ssa_name;
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152 gcc_checking_assert (TYPE_P (type));
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153 ssa_name = make_ssa_name_fn (cfun, type, stmt);
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154 SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
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155 return ssa_name;
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156 }
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157
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158
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159 #endif /* GCC_TREE_SSANAMES_H */
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