1 /* SSA name expresssons routines
2 Copyright (C) 2013-2016 Free Software Foundation, Inc.
4 This file is part of GCC.
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
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
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/>. */
20 #ifndef GCC_TREE_SSANAMES_H
21 #define GCC_TREE_SSANAMES_H
23 /* Aliasing information for SSA_NAMEs representing pointer variables. */
25 struct GTY(()) ptr_info_def
27 /* The points-to solution. */
28 struct pt_solution pt;
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. */
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. */
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
45 unsigned int misalign;
48 /* Value range information for SSA_NAMEs representing non-pointer variables. */
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;
59 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
60 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
62 #define num_ssa_names (vec_safe_length (cfun->gimple_df->ssa_names))
63 #define ssa_name(i) ((*cfun->gimple_df->ssa_names)[(i)])
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 };
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 *,
76 extern void set_nonzero_bits (tree, const wide_int_ref &);
77 extern wide_int get_nonzero_bits (const_tree);
78 extern bool ssa_name_has_boolean_range (tree);
79 extern void init_ssanames (struct function *, int);
80 extern void fini_ssanames (struct function *);
81 extern void ssanames_print_statistics (void);
82 extern tree make_ssa_name_fn (struct function *, tree, gimple *);
83 extern void release_ssa_name_fn (struct function *, tree);
84 extern bool get_ptr_info_alignment (struct ptr_info_def *, 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,
89 extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
91 extern struct ptr_info_def *get_ptr_info (tree);
93 extern tree copy_ssa_name_fn (struct function *, tree, gimple *);
94 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
95 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple *);
96 extern void duplicate_ssa_name_range_info (tree, enum value_range_type,
97 struct range_info_def *);
98 extern void reset_flow_sensitive_info (tree);
99 extern void reset_flow_sensitive_info_in_bb (basic_block);
100 extern void release_defs (gimple *);
101 extern void replace_ssa_name_symbol (tree, tree);
102 extern void flush_ssaname_freelist (void);
105 /* Return an SSA_NAME node for variable VAR defined in statement STMT
109 make_ssa_name (tree var, gimple *stmt = NULL)
111 return make_ssa_name_fn (cfun, var, stmt);
114 /* Return an SSA_NAME node using the template SSA name NAME defined in
115 statement STMT in function cfun. */
118 copy_ssa_name (tree var, gimple *stmt = NULL)
120 return copy_ssa_name_fn (cfun, var, stmt);
123 /* Creates a duplicate of a SSA name NAME tobe defined by statement STMT
127 duplicate_ssa_name (tree var, gimple *stmt)
129 return duplicate_ssa_name_fn (cfun, var, stmt);
132 /* Release the SSA name NAME used in function cfun. */
135 release_ssa_name (tree name)
137 release_ssa_name_fn (cfun, name);
140 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
141 in function cfun. Arrange so that it uses NAME in dumps. */
144 make_temp_ssa_name (tree type, gimple *stmt, const char *name)
147 gcc_checking_assert (TYPE_P (type));
148 ssa_name = make_ssa_name_fn (cfun, type, stmt);
149 SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
154 #endif /* GCC_TREE_SSANAMES_H */