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