gcc/tree-inline.h

/* Tree inlining hooks and declarations.
   Copyright (C) 2001-2015 Free Software Foundation, Inc.
   Contributed by Alexandre Oliva  <aoliva@redhat.com>

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_TREE_INLINE_H
#define GCC_TREE_INLINE_H

#include "hash-map.h"
#include "hash-set.h"

struct cgraph_edge;

/* Indicate the desired behavior wrt call graph edges.  We can either
   duplicate the edge (inlining, cloning), move the edge (versioning,
   parallelization), or move the edges of the clones (saving).  */

enum copy_body_cge_which
{
  CB_CGE_DUPLICATE,
  CB_CGE_MOVE,
  CB_CGE_MOVE_CLONES
};

struct dependence_hasher : default_hashmap_traits
{
  template<typename T>
  static void
  mark_deleted (T &e)
    { gcc_unreachable (); }

  template<typename T>
  static void
  mark_empty (T &e)
    { e.m_key = 0; }

  template<typename T>
  static bool
  is_deleted (T &)
    { return false; }

  template<typename T> static bool is_empty (T &e) { return e.m_key == 0; }
};

/* Data required for function body duplication.  */

struct copy_body_data
{
  /* FUNCTION_DECL for function being inlined, or in general the
     source function providing the original trees.  */
  tree src_fn;

  /* FUNCTION_DECL for function being inlined into, or in general
     the destination function receiving the new trees.  */
  tree dst_fn;

  /* Callgraph node of the source function.  */
  struct cgraph_node *src_node;

  /* Callgraph node of the destination function.  */
  struct cgraph_node *dst_node;

  /* struct function for function being inlined.  Usually this is the same
     as DECL_STRUCT_FUNCTION (src_fn), but can be different if saved_cfg
     and saved_eh are in use.  */
  struct function *src_cfun;

  /* The VAR_DECL for the return value.  */
  tree retvar;

  /* The VAR_DECL for the return bounds.  */
  tree retbnd;

  /* Assign statements that need bounds copy.  */
  vec<gimple> assign_stmts;

  /* The map from local declarations in the inlined function to
     equivalents in the function into which it is being inlined.  */
  hash_map<tree, tree> *decl_map;

  /* Create a new decl to replace DECL in the destination function.  */
  tree (*copy_decl) (tree, struct copy_body_data *);

  /* Current BLOCK.  */
  tree block;

  /* GIMPLE_CALL if va arg parameter packs should be expanded or NULL
     is not.  */
  gcall *call_stmt;

  /* Exception landing pad the inlined call lies in.  */
  int eh_lp_nr;

  /* Maps region and landing pad structures from the function being copied
     to duplicates created within the function we inline into.  */
  hash_map<void *, void *> *eh_map;

  /* We use the same mechanism do all sorts of different things.  Rather
     than enumerating the different cases, we categorize the behavior
     in the various situations.  */

  /* What to do with call graph edges.  */
  enum copy_body_cge_which transform_call_graph_edges;

  /* True if a new CFG should be created.  False for inlining, true for
     everything else.  */
  bool transform_new_cfg;

  /* True if RETURN_EXPRs should be transformed to just the contained
     MODIFY_EXPR.  The branch semantics of the return will be handled
     by manipulating the CFG rather than a statement.  */
  bool transform_return_to_modify;

  /* True if the parameters of the source function are transformed.
     Only true for inlining.  */
  bool transform_parameter;

  /* True if this statement will need to be regimplified.  */
  bool regimplify;

  /* True if trees should not be unshared.  */
  bool do_not_unshare;

  /* > 0 if we are remapping a type currently.  */
  int remapping_type_depth;

  /* A function to be called when duplicating BLOCK nodes.  */
  void (*transform_lang_insert_block) (tree);

  /* Statements that might be possibly folded.  */
  hash_set<gimple> *statements_to_fold;

  /* Entry basic block to currently copied body.  */
  basic_block entry_bb;

  /* For partial function versioning, bitmap of bbs to be copied,
     otherwise NULL.  */
  bitmap blocks_to_copy;

  /* Debug statements that need processing.  */
  vec<gdebug *> debug_stmts;

  /* A map from local declarations in the inlined function to
     equivalents in the function into which it is being inlined, where
     the originals have been mapped to a value rather than to a
     variable.  */
  hash_map<tree, tree> *debug_map;
 
  /* Cilk keywords currently need to replace some variables that
     ordinary nested functions do not.  */ 
  bool remap_var_for_cilk;

  /* A map from the inlined functions dependence info cliques to
     equivalents in the function into which it is being inlined.  */
  hash_map<unsigned short, unsigned short, dependence_hasher> *dependence_map;
};

/* Weights of constructions for estimate_num_insns.  */

typedef struct eni_weights_d
{
  /* Cost per call.  */
  unsigned call_cost;

  /* Cost per indirect call.  */
  unsigned indirect_call_cost;

  /* Cost per call to a target specific builtin */
  unsigned target_builtin_call_cost;

  /* Cost of "expensive" div and mod operations.  */
  unsigned div_mod_cost;

  /* Cost for omp construct.  */
  unsigned omp_cost;

  /* Cost for tm transaction.  */
  unsigned tm_cost;

  /* Cost of return.  */
  unsigned return_cost;

  /* True when time of statement should be estimated.  Thus, the
     cost of a switch statement is logarithmic rather than linear in number
     of cases.  */
  bool time_based;
} eni_weights;

/* Weights that estimate_num_insns uses for heuristics in inlining.  */

extern eni_weights eni_inlining_weights;

/* Weights that estimate_num_insns uses to estimate the size of the
   produced code.  */

extern eni_weights eni_size_weights;

/* Weights that estimate_num_insns uses to estimate the time necessary
   to execute the produced code.  */

extern eni_weights eni_time_weights;

/* Function prototypes.  */
void init_inline_once (void);
extern tree copy_tree_body_r (tree *, int *, void *);
extern void insert_decl_map (copy_body_data *, tree, tree);
unsigned int optimize_inline_calls (tree);
tree maybe_inline_call_in_expr (tree);
bool tree_inlinable_function_p (tree);
tree copy_tree_r (tree *, int *, void *);
tree copy_decl_no_change (tree decl, copy_body_data *id);
int estimate_move_cost (tree type, bool);
int estimate_num_insns (gimple, eni_weights *);
int estimate_num_insns_fn (tree, eni_weights *);
int count_insns_seq (gimple_seq, eni_weights *);
bool tree_versionable_function_p (tree);
extern tree remap_decl (tree decl, copy_body_data *id);
extern tree remap_type (tree type, copy_body_data *id);
extern gimple_seq copy_gimple_seq_and_replace_locals (gimple_seq seq);
extern bool debug_find_tree (tree, tree);
extern tree copy_fn (tree, tree&, tree&);
extern const char *copy_forbidden (struct function *fun, tree fndecl);

/* This is in tree-inline.c since the routine uses
   data structures from the inliner.  */
extern tree build_duplicate_type (tree);

#endif /* GCC_TREE_INLINE_H */