| /* Routines for expanding from SSA form to RTL. |
| Copyright (C) 2009-2018 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 */ |