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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 */