1 | /* Header file for routines that straddle the border between GIMPLE and |
2 | SSA in gimple. |
3 | Copyright (C) 2009-2023 Free Software Foundation, Inc. |
4 | |
5 | This file is part of GCC. |
6 | |
7 | GCC is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by |
9 | the Free Software Foundation; either version 3, or (at your option) |
10 | any later version. |
11 | |
12 | GCC is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. |
16 | |
17 | You should have received a copy of the GNU General Public License |
18 | along with GCC; see the file COPYING3. If not see |
19 | <http://www.gnu.org/licenses/>. */ |
20 | |
21 | #ifndef GCC_GIMPLE_SSA_H |
22 | #define GCC_GIMPLE_SSA_H |
23 | |
24 | #include "tree-ssa-operands.h" |
25 | |
26 | /* This structure is used to map a gimple statement to a label, |
27 | or list of labels to represent transaction restart. */ |
28 | |
29 | struct GTY((for_user)) tm_restart_node { |
30 | gimple *stmt; |
31 | tree label_or_list; |
32 | }; |
33 | |
34 | /* Hasher for tm_restart_node. */ |
35 | |
36 | struct tm_restart_hasher : ggc_ptr_hash<tm_restart_node> |
37 | { |
38 | static hashval_t hash (tm_restart_node *n) { return htab_hash_pointer (n); } |
39 | |
40 | static bool |
41 | equal (tm_restart_node *a, tm_restart_node *b) |
42 | { |
43 | return a == b; |
44 | } |
45 | }; |
46 | |
47 | extern void gt_ggc_mx (gimple *&); |
48 | extern void gt_pch_nx (gimple *&); |
49 | |
50 | struct ssa_name_hasher : ggc_ptr_hash<tree_node> |
51 | { |
52 | /* Hash a tree in a uid_decl_map. */ |
53 | |
54 | static hashval_t |
55 | hash (tree item) |
56 | { |
57 | return item->ssa_name.var->decl_minimal.uid; |
58 | } |
59 | |
60 | /* Return true if the DECL_UID in both trees are equal. */ |
61 | |
62 | static bool |
63 | equal (tree a, tree b) |
64 | { |
65 | return (a->ssa_name.var->decl_minimal.uid == b->ssa_name.var->decl_minimal.uid); |
66 | } |
67 | }; |
68 | |
69 | /* Gimple dataflow datastructure. All publicly available fields shall have |
70 | gimple_ accessor defined, all publicly modifiable fields should have |
71 | gimple_set accessor. */ |
72 | struct GTY(()) gimple_df { |
73 | /* Array of all SSA_NAMEs used in the function. */ |
74 | vec<tree, va_gc> *ssa_names; |
75 | |
76 | /* Artificial variable used for the virtual operand FUD chain. */ |
77 | tree vop; |
78 | |
79 | /* The PTA solution for the ESCAPED artificial variable. */ |
80 | struct pt_solution escaped; |
81 | |
82 | /* A map of decls to artificial ssa-names that point to the partition |
83 | of the decl. */ |
84 | hash_map<tree, tree> * GTY((skip("" ))) decls_to_pointers; |
85 | |
86 | /* Free list of SSA_NAMEs. */ |
87 | vec<tree, va_gc> *free_ssanames; |
88 | |
89 | /* Queue of SSA_NAMEs to be freed at the next opportunity. */ |
90 | vec<tree, va_gc> *free_ssanames_queue; |
91 | |
92 | /* Hashtable holding definition for symbol. If this field is not NULL, it |
93 | means that the first reference to this variable in the function is a |
94 | USE or a VUSE. In those cases, the SSA renamer creates an SSA name |
95 | for this variable with an empty defining statement. */ |
96 | hash_table<ssa_name_hasher> *default_defs; |
97 | |
98 | /* True if there are any symbols that need to be renamed. */ |
99 | unsigned int ssa_renaming_needed : 1; |
100 | |
101 | /* True if all virtual operands need to be renamed. */ |
102 | unsigned int rename_vops : 1; |
103 | |
104 | /* True if the code is in ssa form. */ |
105 | unsigned int in_ssa_p : 1; |
106 | |
107 | /* True if IPA points-to information was computed for this function. */ |
108 | unsigned int ipa_pta : 1; |
109 | |
110 | struct ssa_operands ssa_operands; |
111 | |
112 | /* Map gimple stmt to tree label (or list of labels) for transaction |
113 | restart and abort. */ |
114 | hash_table<tm_restart_hasher> *tm_restart; |
115 | }; |
116 | |
117 | |
118 | /* Return true when gimple SSA form was built. |
119 | gimple_in_ssa_p is queried by gimplifier in various early stages before SSA |
120 | infrastructure is initialized. Check for presence of the datastructures |
121 | at first place. */ |
122 | inline bool |
123 | gimple_in_ssa_p (const struct function *fun) |
124 | { |
125 | return fun && fun->gimple_df && fun->gimple_df->in_ssa_p; |
126 | } |
127 | |
128 | /* Artificial variable used for the virtual operand FUD chain. */ |
129 | inline tree |
130 | gimple_vop (const struct function *fun) |
131 | { |
132 | gcc_checking_assert (fun && fun->gimple_df); |
133 | return fun->gimple_df->vop; |
134 | } |
135 | |
136 | /* Return the set of VUSE operand for statement G. */ |
137 | |
138 | inline use_operand_p |
139 | gimple_vuse_op (const gimple *g) |
140 | { |
141 | struct use_optype_d *ops; |
142 | const gimple_statement_with_memory_ops *mem_ops_stmt = |
143 | dyn_cast <const gimple_statement_with_memory_ops *> (p: g); |
144 | if (!mem_ops_stmt) |
145 | return NULL_USE_OPERAND_P; |
146 | ops = mem_ops_stmt->use_ops; |
147 | if (ops |
148 | && USE_OP_PTR (ops)->use == &mem_ops_stmt->vuse) |
149 | return USE_OP_PTR (ops); |
150 | return NULL_USE_OPERAND_P; |
151 | } |
152 | |
153 | /* Return the set of VDEF operand for statement G. */ |
154 | |
155 | inline def_operand_p |
156 | gimple_vdef_op (gimple *g) |
157 | { |
158 | gimple_statement_with_memory_ops *mem_ops_stmt = |
159 | dyn_cast <gimple_statement_with_memory_ops *> (p: g); |
160 | if (!mem_ops_stmt) |
161 | return NULL_DEF_OPERAND_P; |
162 | if (mem_ops_stmt->vdef) |
163 | return &mem_ops_stmt->vdef; |
164 | return NULL_DEF_OPERAND_P; |
165 | } |
166 | |
167 | /* Mark statement S as modified, and update it. */ |
168 | |
169 | inline void |
170 | update_stmt (gimple *s) |
171 | { |
172 | if (gimple_has_ops (g: s)) |
173 | { |
174 | gimple_set_modified (s, modifiedp: true); |
175 | update_stmt_operands (cfun, s); |
176 | } |
177 | } |
178 | |
179 | /* Update statement S if it has been optimized. */ |
180 | |
181 | inline void |
182 | update_stmt_if_modified (gimple *s) |
183 | { |
184 | if (gimple_modified_p (g: s)) |
185 | update_stmt_operands (cfun, s); |
186 | } |
187 | |
188 | /* Mark statement S as modified, and update it. */ |
189 | |
190 | inline void |
191 | update_stmt_fn (struct function *fn, gimple *s) |
192 | { |
193 | if (gimple_has_ops (g: s)) |
194 | { |
195 | gimple_set_modified (s, modifiedp: true); |
196 | update_stmt_operands (fn, s); |
197 | } |
198 | } |
199 | |
200 | |
201 | #endif /* GCC_GIMPLE_SSA_H */ |
202 | |