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/* Routines for expanding from SSA form to RTL.
Copyright (C) 2009-2020 Free Software Foundation, Inc.
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_OUTOF_SSA_H
#define GCC_TREE_OUTOF_SSA_H
/* This structure (of which only a singleton SA exists) is used to
pass around information between the outof-SSA functions, cfgexpand
and expand itself. */
struct ssaexpand
{
/* The computed partitions of SSA names are stored here. */
var_map map;
/* For an SSA name version V bit V is set iff TER decided that
its definition should be forwarded. */
bitmap values;
/* For a partition number I partition_to_pseudo[I] contains the
RTL expression of the allocated space of it (either a MEM or
a pseudos REG). */
rtx *partition_to_pseudo;
/* If partition I contains an SSA name that has a default def for a
parameter, bit I will be set in this bitmap. */
bitmap partitions_for_parm_default_defs;
/* If partition I contains an SSA name that has an undefined value,
bit I will be set in this bitmap. */
bitmap partitions_for_undefined_values;
};
/* This is the singleton described above. */
extern struct ssaexpand SA;
/* Returns the RTX expression representing the storage of the outof-SSA
partition that the SSA name EXP is a member of. */
static inline rtx
get_rtx_for_ssa_name (tree exp)
{
int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
if (SA.map->partition_to_view)
p = SA.map->partition_to_view[p];
gcc_assert (p != NO_PARTITION);
return SA.partition_to_pseudo[p];
}
/* If TER decided to forward the definition of SSA name EXP this function
returns the defining statement, otherwise NULL. */
static inline gimple *
get_gimple_for_ssa_name (tree exp)
{
int v = SSA_NAME_VERSION (exp);
if (SA.values && bitmap_bit_p (SA.values, v))
return SSA_NAME_DEF_STMT (exp);
return NULL;
}
extern bool ssa_is_replaceable_p (gimple *stmt);
extern void finish_out_of_ssa (struct ssaexpand *sa);
extern unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
extern void expand_phi_nodes (struct ssaexpand *sa);
#endif /* GCC_TREE_OUTOF_SSA_H */
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