| /* Header file for SSA jump threading. |
| Copyright (C) 2013-2021 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_SSA_THREADEDGE_H |
| #define GCC_TREE_SSA_THREADEDGE_H |
| |
| // Class used to maintain path state in the jump threader and pass it |
| // to the jump threader simplifier. |
| |
| class jt_state |
| { |
| public: |
| virtual ~jt_state () { } |
| virtual void push (edge); |
| virtual void pop (); |
| virtual void register_equiv (tree dest, tree src, bool update_range); |
| virtual void register_equivs_edge (edge e); |
| virtual void register_equivs_stmt (gimple *, basic_block, |
| class jt_simplifier *); |
| virtual void record_ranges_from_stmt (gimple *stmt, bool temporary); |
| void get_path (vec<basic_block> &); |
| void append_path (basic_block); |
| void dump (FILE *); |
| void debug (); |
| |
| private: |
| auto_vec<basic_block> m_blocks; |
| static const basic_block BB_MARKER; |
| }; |
| |
| // Statement simplifier callback for the jump threader. |
| |
| class jt_simplifier |
| { |
| public: |
| virtual ~jt_simplifier () { } |
| virtual tree simplify (gimple *, gimple *, basic_block, jt_state *) = 0; |
| }; |
| |
| class hybrid_jt_state : public jt_state |
| { |
| private: |
| void register_equivs_stmt (gimple *, basic_block, jt_simplifier *) override |
| { |
| // Ranger has no need to simplify anything. |
| } |
| }; |
| |
| class hybrid_jt_simplifier : public jt_simplifier |
| { |
| public: |
| hybrid_jt_simplifier (class gimple_ranger *r, class path_range_query *q); |
| tree simplify (gimple *stmt, gimple *, basic_block, jt_state *) override; |
| |
| private: |
| void compute_ranges_from_state (gimple *stmt, jt_state *); |
| |
| gimple_ranger *m_ranger; |
| path_range_query *m_query; |
| auto_vec<basic_block> m_path; |
| }; |
| |
| // This is the high level threader. The entry point is |
| // thread_outgoing_edges(), which calculates and registers paths to be |
| // threaded. When all candidates have been registered, |
| // thread_through_all_blocks() is called to actually change the CFG. |
| |
| class jump_threader |
| { |
| public: |
| jump_threader (jt_simplifier *, class jt_state *); |
| ~jump_threader (); |
| void thread_outgoing_edges (basic_block); |
| void remove_jump_threads_including (edge_def *); |
| bool thread_through_all_blocks (bool may_peel_loop_headers); |
| |
| private: |
| tree simplify_control_stmt_condition (edge, gimple *); |
| tree simplify_control_stmt_condition_1 (edge, |
| gimple *, |
| tree op0, |
| tree_code cond_code, |
| tree op1, |
| unsigned limit); |
| |
| bool thread_around_empty_blocks (vec<class jump_thread_edge *> *path, |
| edge, bitmap visited); |
| int thread_through_normal_block (vec<jump_thread_edge *> *path, |
| edge, bitmap visited); |
| void thread_across_edge (edge); |
| bool record_temporary_equivalences_from_phis (edge); |
| gimple *record_temporary_equivalences_from_stmts_at_dest (edge); |
| |
| // Dummy condition to avoid creating lots of throw away statements. |
| gcond *dummy_cond; |
| |
| class fwd_jt_path_registry *m_registry; |
| jt_simplifier *m_simplifier; |
| jt_state *m_state; |
| }; |
| |
| extern void propagate_threaded_block_debug_into (basic_block, basic_block); |
| extern bool single_succ_to_potentially_threadable_block (basic_block); |
| |
| // ?? All this ssa_name_values stuff is the store of values for |
| // avail_exprs_stack and const_and_copies, so it really belongs in the |
| // jump_threader class. However, it's probably not worth touching |
| // this, since all this windable state is slated to go with the |
| // ranger. |
| extern vec<tree> ssa_name_values; |
| #define SSA_NAME_VALUE(x) \ |
| (SSA_NAME_VERSION (x) < ssa_name_values.length () \ |
| ? ssa_name_values[SSA_NAME_VERSION (x)] \ |
| : NULL_TREE) |
| extern void set_ssa_name_value (tree, tree); |
| |
| #endif /* GCC_TREE_SSA_THREADEDGE_H */ |