1 /* SSA name expresssons routines 2 Copyright (C) 2013-2015 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 66 /* Type of value ranges. See value_range_d In tree-vrp.c for a 67 description of these types. */ 68 enum value_range_type { VR_UNDEFINED, VR_RANGE, VR_ANTI_RANGE, VR_VARYING }; 69 70 /* Sets the value range to SSA. */ 71 extern void set_range_info (tree, enum value_range_type, const wide_int_ref &, 72 const wide_int_ref &); 73 /* Gets the value range from SSA. */ 74 extern enum value_range_type get_range_info (const_tree, wide_int *, 75 wide_int *); 76 extern void set_nonzero_bits (tree, const wide_int_ref &); 77 extern wide_int get_nonzero_bits (const_tree); 78 extern void init_ssanames (struct function *, int); 79 extern void fini_ssanames (void); 80 extern void ssanames_print_statistics (void); 81 extern tree make_ssa_name_fn (struct function *, tree, gimple); 82 extern void release_ssa_name_fn (struct function *, tree); 83 extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *, 84 unsigned int *); 85 extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *); 86 extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int, 87 unsigned int); 88 extern void adjust_ptr_info_misalignment (struct ptr_info_def *, 89 unsigned int); 90 extern struct ptr_info_def *get_ptr_info (tree); 91 92 extern tree copy_ssa_name_fn (struct function *, tree, gimple); 93 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *); 94 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple); 95 extern void duplicate_ssa_name_range_info (tree, enum value_range_type, 96 struct range_info_def *); 97 extern void reset_flow_sensitive_info (tree); 98 extern void reset_flow_sensitive_info_in_bb (basic_block); 99 extern void release_defs (gimple); 100 extern void replace_ssa_name_symbol (tree, tree); 101 102 103 /* Return an SSA_NAME node for variable VAR defined in statement STMT 104 in function cfun. */ 105 106 static inline tree 107 make_ssa_name (tree var, gimple stmt = NULL) 108 { 109 return make_ssa_name_fn (cfun, var, stmt); 110 } 111 112 /* Return an SSA_NAME node using the template SSA name NAME defined in 113 statement STMT in function cfun. */ 114 115 static inline tree 116 copy_ssa_name (tree var, gimple stmt = NULL) 117 { 118 return copy_ssa_name_fn (cfun, var, stmt); 119 } 120 121 /* Creates a duplicate of a SSA name NAME tobe defined by statement STMT 122 in function cfun. */ 123 124 static inline tree 125 duplicate_ssa_name (tree var, gimple stmt) 126 { 127 return duplicate_ssa_name_fn (cfun, var, stmt); 128 } 129 130 /* Release the SSA name NAME used in function cfun. */ 131 132 static inline void 133 release_ssa_name (tree name) 134 { 135 release_ssa_name_fn (cfun, name); 136 } 137 138 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT 139 in function cfun. Arrange so that it uses NAME in dumps. */ 140 141 static inline tree 142 make_temp_ssa_name (tree type, gimple stmt, const char *name) 143 { 144 tree ssa_name; 145 gcc_checking_assert (TYPE_P (type)); 146 ssa_name = make_ssa_name_fn (cfun, type, stmt); 147 SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name)); 148 return ssa_name; 149 } 150 151 152 #endif /* GCC_TREE_SSANAMES_H */ 153