gcc/ipa-utils.h

   1 /* Utilities for ipa analysis.
   2    Copyright (C) 2004-2017 Free Software Foundation, Inc.
   3    Contributed by Kenneth Zadeck <zadeck@naturalbridge.com>
   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
  21 #ifndef GCC_IPA_UTILS_H
  22 #define GCC_IPA_UTILS_H
  23
  24 struct ipa_dfs_info {
  25   int dfn_number;
  26   int low_link;
  27   /* This field will have the samy value for any two nodes in the same strongly
  28      connected component.  */
  29   int scc_no;
  30   bool new_node;
  31   bool on_stack;
  32   struct cgraph_node* next_cycle;
  33   PTR aux;
  34 };
  35
  36
  37 /* In ipa-utils.c  */
  38 void ipa_print_order (FILE*, const char *, struct cgraph_node**, int);
  39 int ipa_reduced_postorder (struct cgraph_node **, bool, bool,
  40                           bool (*ignore_edge) (struct cgraph_edge *));
  41 void ipa_free_postorder_info (void);
  42 vec<cgraph_node *> ipa_get_nodes_in_cycle (struct cgraph_node *);
  43 bool ipa_edge_within_scc (struct cgraph_edge *);
  44 int ipa_reverse_postorder (struct cgraph_node **);
  45 tree get_base_var (tree);
  46 void ipa_merge_profiles (struct cgraph_node *dst,
  47                          struct cgraph_node *src, bool preserve_body = false);
  48 bool recursive_call_p (tree, tree);
  49
  50 /* In ipa-profile.c  */
  51 bool ipa_propagate_frequency (struct cgraph_node *node);
  52
  53 /* In ipa-devirt.c  */
  54
  55 struct odr_type_d;
  56 typedef odr_type_d *odr_type;
  57 void build_type_inheritance_graph (void);
  58 void update_type_inheritance_graph (void);
  59 vec <cgraph_node *>
  60 possible_polymorphic_call_targets (tree, HOST_WIDE_INT,
  61                                    ipa_polymorphic_call_context,
  62                                    bool *copletep = NULL,
  63                                    void **cache_token = NULL,
  64                                    bool speuclative = false);
  65 odr_type get_odr_type (tree, bool insert = false);
  66 bool odr_type_p (const_tree);
  67 bool possible_polymorphic_call_target_p (tree ref, gimple *stmt, struct cgraph_node *n);
  68 void dump_possible_polymorphic_call_targets (FILE *, tree, HOST_WIDE_INT,
  69                                              const ipa_polymorphic_call_context &);
  70 bool possible_polymorphic_call_target_p (tree, HOST_WIDE_INT,
  71                                          const ipa_polymorphic_call_context &,
  72                                          struct cgraph_node *);
  73 tree polymorphic_ctor_dtor_p (tree, bool);
  74 tree inlined_polymorphic_ctor_dtor_block_p (tree, bool);
  75 bool decl_maybe_in_construction_p (tree, tree, gimple *, tree);
  76 tree vtable_pointer_value_to_binfo (const_tree);
  77 bool vtable_pointer_value_to_vtable (const_tree, tree *, unsigned HOST_WIDE_INT *);
  78 tree subbinfo_with_vtable_at_offset (tree, unsigned HOST_WIDE_INT, tree);
  79 void compare_virtual_tables (varpool_node *, varpool_node *);
  80 bool type_all_derivations_known_p (const_tree);
  81 bool type_known_to_have_no_derivations_p (tree);
  82 bool contains_polymorphic_type_p (const_tree);
  83 void register_odr_type (tree);
  84 bool types_must_be_same_for_odr (tree, tree);
  85 bool types_odr_comparable (tree, tree, bool strict = false);
  86 cgraph_node *try_speculative_devirtualization (tree, HOST_WIDE_INT,
  87                                                ipa_polymorphic_call_context);
  88 void warn_types_mismatch (tree t1, tree t2, location_t loc1 = UNKNOWN_LOCATION,
  89                           location_t loc2 = UNKNOWN_LOCATION);
  90 bool odr_or_derived_type_p (const_tree t);
  91 bool odr_types_equivalent_p (tree type1, tree type2);
  92
  93 /* Return vector containing possible targets of polymorphic call E.
  94    If COMPLETEP is non-NULL, store true if the list is complete.
  95    CACHE_TOKEN (if non-NULL) will get stored to an unique ID of entry
  96    in the target cache.  If user needs to visit every target list
  97    just once, it can memoize them.
  98
  99    Returned vector is placed into cache.  It is NOT caller's responsibility
 100    to free it.  The vector can be freed on cgraph_remove_node call if
 101    the particular node is a virtual function present in the cache.  */
 102
 103 inline vec <cgraph_node *>
 104 possible_polymorphic_call_targets (struct cgraph_edge *e,
 105                                    bool *completep = NULL,
 106                                    void **cache_token = NULL,
 107                                    bool speculative = false)
 108 {
 109   ipa_polymorphic_call_context context(e);
 110
 111   return possible_polymorphic_call_targets (e->indirect_info->otr_type,
 112                                             e->indirect_info->otr_token,
 113                                             context,
 114                                             completep, cache_token,
 115                                             speculative);
 116 }
 117
 118 /* Same as above but taking OBJ_TYPE_REF as an parameter.  */
 119
 120 inline vec <cgraph_node *>
 121 possible_polymorphic_call_targets (tree ref,
 122                                    gimple *call,
 123                                    bool *completep = NULL,
 124                                    void **cache_token = NULL)
 125 {
 126   ipa_polymorphic_call_context context (current_function_decl, ref, call);
 127
 128   return possible_polymorphic_call_targets (obj_type_ref_class (ref),
 129                                             tree_to_uhwi
 130                                               (OBJ_TYPE_REF_TOKEN (ref)),
 131                                             context,
 132                                             completep, cache_token);
 133 }
 134
 135 /* Dump possible targets of a polymorphic call E into F.  */
 136
 137 inline void
 138 dump_possible_polymorphic_call_targets (FILE *f, struct cgraph_edge *e)
 139 {
 140   ipa_polymorphic_call_context context(e);
 141
 142   dump_possible_polymorphic_call_targets (f, e->indirect_info->otr_type,
 143                                           e->indirect_info->otr_token,
 144                                           context);
 145 }
 146
 147 /* Return true if N can be possibly target of a polymorphic call of
 148    E.  */
 149
 150 inline bool
 151 possible_polymorphic_call_target_p (struct cgraph_edge *e,
 152                                     struct cgraph_node *n)
 153 {
 154   ipa_polymorphic_call_context context(e);
 155
 156   return possible_polymorphic_call_target_p (e->indirect_info->otr_type,
 157                                              e->indirect_info->otr_token,
 158                                              context, n);
 159 }
 160
 161 /* Return true if BINFO corresponds to a type with virtual methods.
 162
 163    Every type has several BINFOs.  One is the BINFO associated by the type
 164    while other represents bases of derived types.  The BINFOs representing
 165    bases do not have BINFO_VTABLE pointer set when this is the single
 166    inheritance (because vtables are shared).  Look up the BINFO of type
 167    and check presence of its vtable.  */
 168
 169 inline bool
 170 polymorphic_type_binfo_p (const_tree binfo)
 171 {
 172   return (BINFO_TYPE (binfo) && TYPE_BINFO (BINFO_TYPE (binfo))
 173           && BINFO_VTABLE (TYPE_BINFO (BINFO_TYPE (binfo))));
 174 }
 175
 176 /* Return true if T is a type with linkage defined.  */
 177
 178 inline bool
 179 type_with_linkage_p (const_tree t)
 180 {
 181   if (!TYPE_NAME (t) || TREE_CODE (TYPE_NAME (t)) != TYPE_DECL
 182       || !TYPE_STUB_DECL (t))
 183     return false;
 184   /* In LTO do not get confused by non-C++ produced types or types built
 185      with -fno-lto-odr-type-merigng.  */
 186   if (in_lto_p)
 187     {
 188       /* To support -fno-lto-odr-type-merigng recognize types with vtables
 189          to have linkage.  */
 190       if (RECORD_OR_UNION_TYPE_P (t)
 191           && TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t)))
 192         return true;
 193       /* With -flto-odr-type-merging C++ FE specify mangled names
 194          for all types with the linkage.  */
 195       return DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t));
 196     }
 197
 198   if (!RECORD_OR_UNION_TYPE_P (t) && TREE_CODE (t) != ENUMERAL_TYPE)
 199     return false;
 200
 201   /* Builtin types do not define linkage, their TYPE_CONTEXT is NULL.  */
 202   if (!TYPE_CONTEXT (t))
 203     return false;
 204
 205   return true;
 206 }
 207
 208 /* Return true if T is in anonymous namespace.
 209    This works only on those C++ types with linkage defined.  */
 210
 211 inline bool
 212 type_in_anonymous_namespace_p (const_tree t)
 213 {
 214   gcc_checking_assert (type_with_linkage_p (t));
 215
 216   if (!TREE_PUBLIC (TYPE_STUB_DECL (t)))
 217     {
 218       /* C++ FE uses magic <anon> as assembler names of anonymous types.
 219          verify that this match with type_in_anonymous_namespace_p.  */
 220       gcc_checking_assert (!in_lto_p || !DECL_ASSEMBLER_NAME_SET_P (t)
 221                            || !strcmp
 222                                  ("<anon>",
 223                                   IDENTIFIER_POINTER
 224                                      (DECL_ASSEMBLER_NAME (TYPE_NAME (t)))));
 225       return true;
 226     }
 227   return false;
 228 }
 229
 230 /* Return true of T is type with One Definition Rule info attached.
 231    It means that either it is anonymous type or it has assembler name
 232    set.  */
 233
 234 inline bool
 235 odr_type_p (const_tree t)
 236 {
 237   /* We do not have this information when not in LTO, but we do not need
 238      to care, since it is used only for type merging.  */
 239   gcc_checking_assert (in_lto_p || flag_lto);
 240
 241   if (!type_with_linkage_p (t))
 242     return false;
 243
 244   /* To support -fno-lto-odr-type-merging consider types with vtables ODR.  */
 245   if (type_in_anonymous_namespace_p (t))
 246     return true;
 247
 248   if (TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL
 249       && DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t)))
 250     {
 251       /* C++ FE uses magic <anon> as assembler names of anonymous types.
 252          verify that this match with type_in_anonymous_namespace_p.  */
 253       gcc_checking_assert (strcmp ("<anon>",
 254                                       IDENTIFIER_POINTER
 255                                         (DECL_ASSEMBLER_NAME (TYPE_NAME (t)))));
 256       return true;
 257     }
 258   return false;
 259 }
 260
 261 #endif  /* GCC_IPA_UTILS_H  */
 262
 263