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369451ec | 1 | /* IPA reference lists. |
cbe34bb5 | 2 | Copyright (C) 2010-2017 Free Software Foundation, Inc. |
369451ec JH |
3 | Contributed by Jan Hubicka |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | 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 | ||
f1717f8d KC |
21 | #ifndef GCC_IPA_REF_H |
22 | #define GCC_IPA_REF_H | |
23 | ||
369451ec | 24 | struct cgraph_node; |
2c8326a5 | 25 | class varpool_node; |
5e20cdc9 | 26 | class symtab_node; |
5932a4d4 | 27 | |
369451ec JH |
28 | |
29 | /* How the reference is done. */ | |
30 | enum GTY(()) ipa_ref_use | |
31 | { | |
32 | IPA_REF_LOAD, | |
33 | IPA_REF_STORE, | |
39e2db00 | 34 | IPA_REF_ADDR, |
d5e254e1 IE |
35 | IPA_REF_ALIAS, |
36 | IPA_REF_CHKP | |
369451ec JH |
37 | }; |
38 | ||
369451ec JH |
39 | /* Record of reference in callgraph or varpool. */ |
40 | struct GTY(()) ipa_ref | |
41 | { | |
d122681a ML |
42 | public: |
43 | /* Remove reference. */ | |
44 | void remove_reference (); | |
45 | ||
46 | /* Return true when execution of reference can lead to return from | |
47 | function. */ | |
48 | bool cannot_lead_to_return (); | |
49 | ||
5ebd0e61 ML |
50 | /* Return true if refernece may be used in address compare. */ |
51 | bool address_matters_p (); | |
52 | ||
d122681a ML |
53 | /* Return reference list this reference is in. */ |
54 | struct ipa_ref_list * referring_ref_list (void); | |
55 | ||
56 | /* Return reference list this reference is in. */ | |
57 | struct ipa_ref_list * referred_ref_list (void); | |
58 | ||
5e20cdc9 DM |
59 | symtab_node *referring; |
60 | symtab_node *referred; | |
355fe088 | 61 | gimple *stmt; |
042ae7d2 | 62 | unsigned int lto_stmt_uid; |
5932a4d4 | 63 | unsigned int referred_index; |
d5e254e1 | 64 | ENUM_BITFIELD (ipa_ref_use) use:3; |
042ae7d2 | 65 | unsigned int speculative:1; |
369451ec JH |
66 | }; |
67 | ||
68 | typedef struct ipa_ref ipa_ref_t; | |
69 | typedef struct ipa_ref *ipa_ref_ptr; | |
70 | ||
369451ec JH |
71 | |
72 | /* List of references. This is stored in both callgraph and varpool nodes. */ | |
73 | struct GTY(()) ipa_ref_list | |
74 | { | |
d122681a ML |
75 | public: |
76 | /* Return first reference in list or NULL if empty. */ | |
77 | struct ipa_ref *first_reference (void) | |
78 | { | |
79 | if (!vec_safe_length (references)) | |
80 | return NULL; | |
81 | return &(*references)[0]; | |
82 | } | |
83 | ||
84 | /* Return first referring ref in list or NULL if empty. */ | |
85 | struct ipa_ref *first_referring (void) | |
86 | { | |
87 | if (!referring.length ()) | |
88 | return NULL; | |
89 | return referring[0]; | |
90 | } | |
91 | ||
e55637b7 ML |
92 | /* Return first referring alias. */ |
93 | struct ipa_ref *first_alias (void) | |
94 | { | |
95 | struct ipa_ref *r = first_referring (); | |
96 | ||
97 | return r && r->use == IPA_REF_ALIAS ? r : NULL; | |
98 | } | |
99 | ||
100 | /* Return last referring alias. */ | |
101 | struct ipa_ref *last_alias (void) | |
102 | { | |
103 | unsigned int i = 0; | |
104 | ||
105 | for(i = 0; i < referring.length (); i++) | |
106 | if (referring[i]->use != IPA_REF_ALIAS) | |
107 | break; | |
108 | ||
109 | return i == 0 ? NULL : referring[i - 1]; | |
110 | } | |
111 | ||
112 | /* Return true if the symbol has an alias. */ | |
113 | bool inline has_aliases_p (void) | |
114 | { | |
115 | return first_alias (); | |
116 | } | |
117 | ||
d122681a ML |
118 | /* Clear reference list. */ |
119 | void clear (void) | |
120 | { | |
121 | referring.create (0); | |
122 | references = NULL; | |
123 | } | |
124 | ||
125 | /* Return number of references. */ | |
126 | unsigned int nreferences (void) | |
127 | { | |
128 | return vec_safe_length (references); | |
129 | } | |
130 | ||
369451ec | 131 | /* Store actual references in references vector. */ |
9771b263 | 132 | vec<ipa_ref_t, va_gc> *references; |
073a8998 | 133 | /* Referring is vector of pointers to references. It must not live in GGC space |
369451ec | 134 | or GGC will try to mark middle of references vectors. */ |
9771b263 | 135 | vec<ipa_ref_ptr> GTY((skip)) referring; |
369451ec | 136 | }; |
f1717f8d KC |
137 | |
138 | #endif /* GCC_IPA_REF_H */ |