gcc/tree-inline.h

   1 /* Tree inlining hooks and declarations.
   2    Copyright (C) 2001-2017 Free Software Foundation, Inc.
   3    Contributed by Alexandre Oliva  <aoliva@redhat.com>
   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_TREE_INLINE_H
  22 #define GCC_TREE_INLINE_H
  23
  24
  25 struct cgraph_edge;
  26
  27 /* Indicate the desired behavior wrt call graph edges.  We can either
  28    duplicate the edge (inlining, cloning), move the edge (versioning,
  29    parallelization), or move the edges of the clones (saving).  */
  30
  31 enum copy_body_cge_which
  32 {
  33   CB_CGE_DUPLICATE,
  34   CB_CGE_MOVE,
  35   CB_CGE_MOVE_CLONES
  36 };
  37
  38 typedef int_hash <unsigned short, 0> dependence_hash;
  39
  40 /* Data required for function body duplication.  */
  41
  42 struct copy_body_data
  43 {
  44   /* FUNCTION_DECL for function being inlined, or in general the
  45      source function providing the original trees.  */
  46   tree src_fn;
  47
  48   /* FUNCTION_DECL for function being inlined into, or in general
  49      the destination function receiving the new trees.  */
  50   tree dst_fn;
  51
  52   /* Callgraph node of the source function.  */
  53   struct cgraph_node *src_node;
  54
  55   /* Callgraph node of the destination function.  */
  56   struct cgraph_node *dst_node;
  57
  58   /* struct function for function being inlined.  Usually this is the same
  59      as DECL_STRUCT_FUNCTION (src_fn), but can be different if saved_cfg
  60      and saved_eh are in use.  */
  61   struct function *src_cfun;
  62
  63   /* The VAR_DECL for the return value.  */
  64   tree retvar;
  65
  66   /* The VAR_DECL for the return bounds.  */
  67   tree retbnd;
  68
  69   /* Assign statements that need bounds copy.  */
  70   vec<gimple *> assign_stmts;
  71
  72   /* The map from local declarations in the inlined function to
  73      equivalents in the function into which it is being inlined.  */
  74   hash_map<tree, tree> *decl_map;
  75
  76   /* Create a new decl to replace DECL in the destination function.  */
  77   tree (*copy_decl) (tree, struct copy_body_data *);
  78
  79   /* Current BLOCK.  */
  80   tree block;
  81
  82   /* GIMPLE_CALL if va arg parameter packs should be expanded or NULL
  83      is not.  */
  84   gimple *call_stmt;
  85
  86   /* Exception landing pad the inlined call lies in.  */
  87   int eh_lp_nr;
  88
  89   /* Maps region and landing pad structures from the function being copied
  90      to duplicates created within the function we inline into.  */
  91   hash_map<void *, void *> *eh_map;
  92
  93   /* We use the same mechanism do all sorts of different things.  Rather
  94      than enumerating the different cases, we categorize the behavior
  95      in the various situations.  */
  96
  97   /* What to do with call graph edges.  */
  98   enum copy_body_cge_which transform_call_graph_edges;
  99
 100   /* True if a new CFG should be created.  False for inlining, true for
 101      everything else.  */
 102   bool transform_new_cfg;
 103
 104   /* True if RETURN_EXPRs should be transformed to just the contained
 105      MODIFY_EXPR.  The branch semantics of the return will be handled
 106      by manipulating the CFG rather than a statement.  */
 107   bool transform_return_to_modify;
 108
 109   /* True if the parameters of the source function are transformed.
 110      Only true for inlining.  */
 111   bool transform_parameter;
 112
 113   /* True if this statement will need to be regimplified.  */
 114   bool regimplify;
 115
 116   /* True if trees should not be unshared.  */
 117   bool do_not_unshare;
 118
 119   /* > 0 if we are remapping a type currently.  */
 120   int remapping_type_depth;
 121
 122   /* A function to be called when duplicating BLOCK nodes.  */
 123   void (*transform_lang_insert_block) (tree);
 124
 125   /* Statements that might be possibly folded.  */
 126   hash_set<gimple *> *statements_to_fold;
 127
 128   /* Entry basic block to currently copied body.  */
 129   basic_block entry_bb;
 130
 131   /* For partial function versioning, bitmap of bbs to be copied,
 132      otherwise NULL.  */
 133   bitmap blocks_to_copy;
 134
 135   /* Debug statements that need processing.  */
 136   vec<gdebug *> debug_stmts;
 137
 138   /* A map from local declarations in the inlined function to
 139      equivalents in the function into which it is being inlined, where
 140      the originals have been mapped to a value rather than to a
 141      variable.  */
 142   hash_map<tree, tree> *debug_map;
 143
 144   /* A map from the inlined functions dependence info cliques to
 145      equivalents in the function into which it is being inlined.  */
 146   hash_map<dependence_hash, unsigned short> *dependence_map;
 147
 148   /* Cilk keywords currently need to replace some variables that
 149      ordinary nested functions do not.  */
 150   bool remap_var_for_cilk;
 151
 152   /* Do not create new declarations when within type remapping.  */
 153   bool prevent_decl_creation_for_types;
 154 };
 155
 156 /* Weights of constructions for estimate_num_insns.  */
 157
 158 struct eni_weights
 159 {
 160   /* Cost per call.  */
 161   unsigned call_cost;
 162
 163   /* Cost per indirect call.  */
 164   unsigned indirect_call_cost;
 165
 166   /* Cost per call to a target specific builtin */
 167   unsigned target_builtin_call_cost;
 168
 169   /* Cost of "expensive" div and mod operations.  */
 170   unsigned div_mod_cost;
 171
 172   /* Cost for omp construct.  */
 173   unsigned omp_cost;
 174
 175   /* Cost for tm transaction.  */
 176   unsigned tm_cost;
 177
 178   /* Cost of return.  */
 179   unsigned return_cost;
 180
 181   /* True when time of statement should be estimated.  Thus, the
 182      cost of a switch statement is logarithmic rather than linear in number
 183      of cases.  */
 184   bool time_based;
 185 };
 186
 187 /* Weights that estimate_num_insns uses for heuristics in inlining.  */
 188
 189 extern eni_weights eni_inlining_weights;
 190
 191 /* Weights that estimate_num_insns uses to estimate the size of the
 192    produced code.  */
 193
 194 extern eni_weights eni_size_weights;
 195
 196 /* Weights that estimate_num_insns uses to estimate the time necessary
 197    to execute the produced code.  */
 198
 199 extern eni_weights eni_time_weights;
 200
 201 /* Function prototypes.  */
 202 void init_inline_once (void);
 203 extern tree copy_tree_body_r (tree *, int *, void *);
 204 extern void insert_decl_map (copy_body_data *, tree, tree);
 205 unsigned int optimize_inline_calls (tree);
 206 tree maybe_inline_call_in_expr (tree);
 207 bool tree_inlinable_function_p (tree);
 208 tree copy_tree_r (tree *, int *, void *);
 209 tree copy_decl_no_change (tree decl, copy_body_data *id);
 210 int estimate_move_cost (tree type, bool);
 211 int estimate_num_insns (gimple *, eni_weights *);
 212 int estimate_num_insns_fn (tree, eni_weights *);
 213 int estimate_num_insns_seq (gimple_seq, eni_weights *);
 214 bool tree_versionable_function_p (tree);
 215 extern tree remap_decl (tree decl, copy_body_data *id);
 216 extern tree remap_type (tree type, copy_body_data *id);
 217 extern gimple_seq copy_gimple_seq_and_replace_locals (gimple_seq seq);
 218 extern bool debug_find_tree (tree, tree);
 219 extern tree copy_fn (tree, tree&, tree&);
 220 extern const char *copy_forbidden (struct function *fun);
 221
 222 /* This is in tree-inline.c since the routine uses
 223    data structures from the inliner.  */
 224 extern tree build_duplicate_type (tree);
 225
 226 #endif /* GCC_TREE_INLINE_H */