gcc/ipa-utils.h

   1 /* Utilities for ipa analysis.
   2    Copyright (C) 2004-2018 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 rebuild_type_inheritance_graph (void);
  59 void update_type_inheritance_graph (void);
  60 vec <cgraph_node *>
  61 possible_polymorphic_call_targets (tree, HOST_WIDE_INT,
  62                                    ipa_polymorphic_call_context,
  63                                    bool *copletep = NULL,
  64                                    void **cache_token = NULL,
  65                                    bool speuclative = false);
  66 odr_type get_odr_type (tree, bool insert = false);
  67 bool odr_type_p (const_tree);
  68 bool possible_polymorphic_call_target_p (tree ref, gimple *stmt, struct cgraph_node *n);
  69 void dump_possible_polymorphic_call_targets (FILE *, tree, HOST_WIDE_INT,
  70                                              const ipa_polymorphic_call_context &);
  71 bool possible_polymorphic_call_target_p (tree, HOST_WIDE_INT,
  72                                          const ipa_polymorphic_call_context &,
  73                                          struct cgraph_node *);
  74 tree polymorphic_ctor_dtor_p (tree, bool);
  75 tree inlined_polymorphic_ctor_dtor_block_p (tree, bool);
  76 bool decl_maybe_in_construction_p (tree, tree, gimple *, tree);
  77 tree vtable_pointer_value_to_binfo (const_tree);
  78 bool vtable_pointer_value_to_vtable (const_tree, tree *, unsigned HOST_WIDE_INT *);
  79 tree subbinfo_with_vtable_at_offset (tree, unsigned HOST_WIDE_INT, tree);
  80 void compare_virtual_tables (varpool_node *, varpool_node *);
  81 bool type_all_derivations_known_p (const_tree);
  82 bool type_known_to_have_no_derivations_p (tree);
  83 bool contains_polymorphic_type_p (const_tree);
  84 void register_odr_type (tree);
  85 bool types_must_be_same_for_odr (tree, tree);
  86 bool types_odr_comparable (tree, tree, bool strict = false);
  87 cgraph_node *try_speculative_devirtualization (tree, HOST_WIDE_INT,
  88                                                ipa_polymorphic_call_context);
  89 void warn_types_mismatch (tree t1, tree t2, location_t loc1 = UNKNOWN_LOCATION,
  90                           location_t loc2 = UNKNOWN_LOCATION);
  91 bool odr_or_derived_type_p (const_tree t);
  92 bool odr_types_equivalent_p (tree type1, tree type2);
  93
  94 /* Return vector containing possible targets of polymorphic call E.
  95    If COMPLETEP is non-NULL, store true if the list is complete.
  96    CACHE_TOKEN (if non-NULL) will get stored to an unique ID of entry
  97    in the target cache.  If user needs to visit every target list
  98    just once, it can memoize them.
  99
 100    Returned vector is placed into cache.  It is NOT caller's responsibility
 101    to free it.  The vector can be freed on cgraph_remove_node call if
 102    the particular node is a virtual function present in the cache.  */
 103
 104 inline vec <cgraph_node *>
 105 possible_polymorphic_call_targets (struct cgraph_edge *e,
 106                                    bool *completep = NULL,
 107                                    void **cache_token = NULL,
 108                                    bool speculative = false)
 109 {
 110   ipa_polymorphic_call_context context(e);
 111
 112   return possible_polymorphic_call_targets (e->indirect_info->otr_type,
 113                                             e->indirect_info->otr_token,
 114                                             context,
 115                                             completep, cache_token,
 116                                             speculative);
 117 }
 118
 119 /* Same as above but taking OBJ_TYPE_REF as an parameter.  */
 120
 121 inline vec <cgraph_node *>
 122 possible_polymorphic_call_targets (tree ref,
 123                                    gimple *call,
 124                                    bool *completep = NULL,
 125                                    void **cache_token = NULL)
 126 {
 127   ipa_polymorphic_call_context context (current_function_decl, ref, call);
 128
 129   return possible_polymorphic_call_targets (obj_type_ref_class (ref),
 130                                             tree_to_uhwi
 131                                               (OBJ_TYPE_REF_TOKEN (ref)),
 132                                             context,
 133                                             completep, cache_token);
 134 }
 135
 136 /* Dump possible targets of a polymorphic call E into F.  */
 137
 138 inline void
 139 dump_possible_polymorphic_call_targets (FILE *f, struct cgraph_edge *e)
 140 {
 141   ipa_polymorphic_call_context context(e);
 142
 143   dump_possible_polymorphic_call_targets (f, e->indirect_info->otr_type,
 144                                           e->indirect_info->otr_token,
 145                                           context);
 146 }
 147
 148 /* Return true if N can be possibly target of a polymorphic call of
 149    E.  */
 150
 151 inline bool
 152 possible_polymorphic_call_target_p (struct cgraph_edge *e,
 153                                     struct cgraph_node *n)
 154 {
 155   ipa_polymorphic_call_context context(e);
 156
 157   return possible_polymorphic_call_target_p (e->indirect_info->otr_type,
 158                                              e->indirect_info->otr_token,
 159                                              context, n);
 160 }
 161
 162 /* Return true if BINFO corresponds to a type with virtual methods.
 163
 164    Every type has several BINFOs.  One is the BINFO associated by the type
 165    while other represents bases of derived types.  The BINFOs representing
 166    bases do not have BINFO_VTABLE pointer set when this is the single
 167    inheritance (because vtables are shared).  Look up the BINFO of type
 168    and check presence of its vtable.  */
 169
 170 inline bool
 171 polymorphic_type_binfo_p (const_tree binfo)
 172 {
 173   return (BINFO_TYPE (binfo) && TYPE_BINFO (BINFO_TYPE (binfo))
 174           && BINFO_VTABLE (TYPE_BINFO (BINFO_TYPE (binfo))));
 175 }
 176
 177 /* Return true if T is a type with linkage defined.  */
 178
 179 inline bool
 180 type_with_linkage_p (const_tree t)
 181 {
 182   if (!TYPE_NAME (t) || TREE_CODE (TYPE_NAME (t)) != TYPE_DECL)
 183     return false;
 184
 185   /* To support -fno-lto-odr-type-merigng recognize types with vtables
 186      to have linkage.  */
 187   if (RECORD_OR_UNION_TYPE_P (t)
 188       && TYPE_BINFO (t) && BINFO_VTABLE (TYPE_BINFO (t)))
 189     return true;
 190
 191   /* After free_lang_data was run and -flto-odr-type-merging we can recongize
 192      types with linkage by presence of mangled name.  */
 193   if (DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t)))
 194     return true;
 195
 196   /* If free lang data was not run check if indeed the type looks like C++
 197      type with linkage.  */
 198   if (in_lto_p || !TYPE_STUB_DECL (t))
 199     return false;
 200
 201   if (!RECORD_OR_UNION_TYPE_P (t) && TREE_CODE (t) != ENUMERAL_TYPE)
 202     return false;
 203
 204   /* Builtin types do not define linkage, their TYPE_CONTEXT is NULL.  */
 205   if (!TYPE_CONTEXT (t))
 206     return false;
 207
 208   return true;
 209 }
 210
 211 /* Return true if T is in anonymous namespace.
 212    This works only on those C++ types with linkage defined.  */
 213
 214 inline bool
 215 type_in_anonymous_namespace_p (const_tree t)
 216 {
 217   gcc_checking_assert (type_with_linkage_p (t));
 218
 219   /* free_lang_data clears TYPE_STUB_DECL but sets assembler name to
 220      "<anon>"  */
 221   if (DECL_ASSEMBLER_NAME_SET_P (TYPE_NAME (t)))
 222     return !strcmp ("<anon>",
 223                     IDENTIFIER_POINTER
 224                     (DECL_ASSEMBLER_NAME (TYPE_NAME (t))));
 225   else if (!TYPE_STUB_DECL (t))
 226     return false;
 227   else
 228     return !TREE_PUBLIC (TYPE_STUB_DECL (t));
 229 }
 230
 231 /* Return true of T is type with One Definition Rule info attached.
 232    It means that either it is anonymous type or it has assembler name
 233    set.  */
 234
 235 inline bool
 236 odr_type_p (const_tree t)
 237 {
 238   /* We do not have this information when not in LTO, but we do not need
 239      to care, since it is used only for type merging.  */
 240   gcc_checking_assert (in_lto_p || flag_lto);
 241
 242   if (!type_with_linkage_p (t))
 243     return false;
 244
 245   /* To support -fno-lto-odr-type-merging consider types with vtables ODR.  */
 246   if (type_in_anonymous_namespace_p (t))
 247     return true;
 248
 249   if (TYPE_NAME (t) && 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