| /* Classes for purging state at function_points. |
| Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| Contributed by David Malcolm <dmalcolm@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_ANALYZER_STATE_PURGE_H |
| #define GCC_ANALYZER_STATE_PURGE_H |
| |
| /* Hash traits for function_point. */ |
| |
| template <> struct default_hash_traits<function_point> |
| : public pod_hash_traits<function_point> |
| { |
| static const bool empty_zero_p = false; |
| }; |
| |
| template <> |
| inline hashval_t |
| pod_hash_traits<function_point>::hash (value_type v) |
| { |
| return v.hash (); |
| } |
| |
| template <> |
| inline bool |
| pod_hash_traits<function_point>::equal (const value_type &existing, |
| const value_type &candidate) |
| { |
| return existing == candidate; |
| } |
| template <> |
| inline void |
| pod_hash_traits<function_point>::mark_deleted (value_type &v) |
| { |
| v = function_point::deleted (); |
| } |
| template <> |
| inline void |
| pod_hash_traits<function_point>::mark_empty (value_type &v) |
| { |
| v = function_point::empty (); |
| } |
| template <> |
| inline bool |
| pod_hash_traits<function_point>::is_deleted (value_type v) |
| { |
| return v.get_kind () == PK_DELETED; |
| } |
| template <> |
| inline bool |
| pod_hash_traits<function_point>::is_empty (value_type v) |
| { |
| return v.get_kind () == PK_EMPTY; |
| } |
| |
| namespace ana { |
| |
| /* The result of analyzing which SSA names can be purged from state at |
| different points in the program, so that we can simplify program_state |
| objects, in the hope of reducing state-blowup. */ |
| |
| class state_purge_map : public log_user |
| { |
| public: |
| typedef ordered_hash_map<tree, state_purge_per_ssa_name *> map_t; |
| typedef map_t::iterator iterator; |
| |
| state_purge_map (const supergraph &sg, logger *logger); |
| ~state_purge_map (); |
| |
| const state_purge_per_ssa_name &get_data_for_ssa_name (tree name) const |
| { |
| gcc_assert (TREE_CODE (name) == SSA_NAME); |
| if (tree var = SSA_NAME_VAR (name)) |
| if (TREE_CODE (var) == VAR_DECL) |
| gcc_assert (!VAR_DECL_IS_VIRTUAL_OPERAND (var)); |
| |
| state_purge_per_ssa_name **slot |
| = const_cast <map_t&> (m_map).get (name); |
| return **slot; |
| } |
| |
| const supergraph &get_sg () const { return m_sg; } |
| |
| iterator begin () const { return m_map.begin (); } |
| iterator end () const { return m_map.end (); } |
| |
| private: |
| DISABLE_COPY_AND_ASSIGN (state_purge_map); |
| |
| const supergraph &m_sg; |
| map_t m_map; |
| }; |
| |
| /* The part of a state_purge_map relating to a specific SSA name. |
| |
| The result of analyzing a given SSA name, recording which |
| function_points need to retain state information about it to handle |
| their successor states, so that we can simplify program_state objects, |
| in the hope of reducing state-blowup. */ |
| |
| class state_purge_per_ssa_name |
| { |
| public: |
| state_purge_per_ssa_name (const state_purge_map &map, |
| tree name, |
| function *fun); |
| |
| bool needed_at_point_p (const function_point &point) const; |
| |
| function *get_function () const { return m_fun; } |
| |
| private: |
| static function_point before_use_stmt (const state_purge_map &map, |
| const gimple *use_stmt); |
| |
| void add_to_worklist (const function_point &point, |
| auto_vec<function_point> *worklist, |
| logger *logger); |
| |
| void process_point (const function_point &point, |
| auto_vec<function_point> *worklist, |
| const state_purge_map &map); |
| |
| typedef hash_set<function_point> point_set_t; |
| point_set_t m_points_needing_name; |
| tree m_name; |
| function *m_fun; |
| }; |
| |
| /* Subclass of dot_annotator for use by -fdump-analyzer-state-purge. |
| Annotate the .dot output with state-purge information. */ |
| |
| class state_purge_annotator : public dot_annotator |
| { |
| public: |
| state_purge_annotator (const state_purge_map *map) : m_map (map) {} |
| |
| bool add_node_annotations (graphviz_out *gv, const supernode &n, bool) |
| const FINAL OVERRIDE; |
| |
| void add_stmt_annotations (graphviz_out *gv, const gimple *stmt, |
| bool within_row) |
| const FINAL OVERRIDE; |
| |
| private: |
| void print_needed (graphviz_out *gv, |
| const function_point &point, |
| bool within_table) const; |
| |
| const state_purge_map *m_map; |
| }; |
| |
| } // namespace ana |
| |
| #endif /* GCC_ANALYZER_STATE_PURGE_H */ |