1 /* SSA name expresssons routines
2 Copyright (C) 2013 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 (()) range_info_def {
51 /* Minimum for value range. */
53 /* Maximum for value range. */
55 /* Non-zero bits - bits not set are guaranteed to be always zero. */
56 double_int nonzero_bits;
60 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
61 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
62 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
64 #define num_ssa_names (vec_safe_length (cfun->gimple_df->ssa_names))
65 #define ssa_name(i) ((*cfun->gimple_df->ssa_names)[(i)])
68 /* Type of value ranges. See value_range_d In tree-vrp.c for a
69 description of these types. */
70 enum value_range_type { VR_UNDEFINED, VR_RANGE, VR_ANTI_RANGE, VR_VARYING };
72 /* Sets the value range to SSA. */
73 extern void set_range_info (tree, double_int, double_int);
74 /* Gets the value range from SSA. */
75 extern enum value_range_type get_range_info (tree, double_int *, double_int *);
76 extern void set_nonzero_bits (tree, double_int);
77 extern double_int get_nonzero_bits (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 (tree);
83 extern bool get_ptr_info_alignment (struct ptr_info_def *, 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,
88 extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
90 extern struct ptr_info_def *get_ptr_info (tree);
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, struct range_info_def *);
96 extern void release_defs (gimple);
97 extern void replace_ssa_name_symbol (tree, tree);
100 /* Return an SSA_NAME node for variable VAR defined in statement STMT
104 make_ssa_name (tree var, gimple stmt)
106 return make_ssa_name_fn (cfun, var, stmt);
109 /* Return an SSA_NAME node using the template SSA name NAME defined in
110 statement STMT in function cfun. */
113 copy_ssa_name (tree var, gimple stmt)
115 return copy_ssa_name_fn (cfun, var, stmt);
118 /* Creates a duplicate of a SSA name NAME tobe defined by statement STMT
122 duplicate_ssa_name (tree var, gimple stmt)
124 return duplicate_ssa_name_fn (cfun, var, stmt);
127 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
128 in function cfun. Arrange so that it uses NAME in dumps. */
131 make_temp_ssa_name (tree type, gimple stmt, const char *name)
134 gcc_checking_assert (TYPE_P (type));
135 ssa_name = make_ssa_name_fn (cfun, type, stmt);
136 SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
141 #endif /* GCC_TREE_SSANAMES_H */