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/* Tree inlining hooks and declarations.

   Copyright 2001, 2003, 2004, 2005, 2007, 2008, 2009

   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 "gimple.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

};

/* Data required for function body duplication.  */

typedef 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 map from local declarations in the inlined function to

     equivalents in the function into which it is being inlined.  */

  struct pointer_map_t *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.  */

  gimple gimple_call;

  /* 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.  */

  struct pointer_map_t *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 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.  */

  struct pointer_set_t *statements_to_fold;

  /* Entry basic block to currently copied body.  */

  struct basic_block_def *entry_bb;

  /* Debug statements that need processing.  */

  VEC(gimple,heap) *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.  */

  struct pointer_map_t *debug_map;

} copy_body_data;

/* Weights of constructions for estimate_num_insns.  */

typedef struct eni_weights_d

{

  /* Cost per call.  */

  unsigned 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;

  /* True when time of statemnt should be estimated.  Thus i.e

     cost of 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.  */

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);

void save_body (tree, tree *, tree *);

int estimate_move_cost (tree type);

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);

bool tree_can_inline_p (struct cgraph_edge *e);

extern gimple_seq remap_gimple_seq (gimple_seq, copy_body_data *);

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 HOST_WIDE_INT estimated_stack_frame_size (void);

#endif /* GCC_TREE_INLINE_H */