| /* Top-level control of tree optimizations. |
| Copyright (C) 2001-2013 Free Software Foundation, Inc. |
| Contributed by Diego Novillo <dnovillo@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/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "tree.h" |
| #include "tm_p.h" |
| #include "basic-block.h" |
| #include "flags.h" |
| #include "tree-flow.h" |
| #include "function.h" |
| #include "langhooks.h" |
| #include "diagnostic-core.h" |
| #include "toplev.h" |
| #include "flags.h" |
| #include "cgraph.h" |
| #include "tree-inline.h" |
| #include "tree-pass.h" |
| #include "ggc.h" |
| #include "cgraph.h" |
| #include "cfgloop.h" |
| #include "except.h" |
| #include "plugin.h" |
| |
| |
| /* Pass: cleanup the CFG just before expanding trees to RTL. |
| This is just a round of label cleanups and case node grouping |
| because after the tree optimizers have run such cleanups may |
| be necessary. */ |
| |
| static unsigned int |
| execute_cleanup_cfg_post_optimizing (void) |
| { |
| unsigned int todo = 0; |
| if (cleanup_tree_cfg ()) |
| todo |= TODO_update_ssa; |
| maybe_remove_unreachable_handlers (); |
| cleanup_dead_labels (); |
| group_case_labels (); |
| if ((flag_compare_debug_opt || flag_compare_debug) |
| && flag_dump_final_insns) |
| { |
| FILE *final_output = fopen (flag_dump_final_insns, "a"); |
| |
| if (!final_output) |
| { |
| error ("could not open final insn dump file %qs: %m", |
| flag_dump_final_insns); |
| flag_dump_final_insns = NULL; |
| } |
| else |
| { |
| int save_unnumbered = flag_dump_unnumbered; |
| int save_noaddr = flag_dump_noaddr; |
| |
| flag_dump_noaddr = flag_dump_unnumbered = 1; |
| fprintf (final_output, "\n"); |
| dump_enumerated_decls (final_output, dump_flags | TDF_NOUID); |
| flag_dump_noaddr = save_noaddr; |
| flag_dump_unnumbered = save_unnumbered; |
| if (fclose (final_output)) |
| { |
| error ("could not close final insn dump file %qs: %m", |
| flag_dump_final_insns); |
| flag_dump_final_insns = NULL; |
| } |
| } |
| } |
| return todo; |
| } |
| |
| struct gimple_opt_pass pass_cleanup_cfg_post_optimizing = |
| { |
| { |
| GIMPLE_PASS, |
| "optimized", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| NULL, /* gate */ |
| execute_cleanup_cfg_post_optimizing, /* execute */ |
| NULL, /* sub */ |
| NULL, /* next */ |
| 0, /* static_pass_number */ |
| TV_TREE_CLEANUP_CFG, /* tv_id */ |
| PROP_cfg, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| TODO_remove_unused_locals /* todo_flags_finish */ |
| } |
| }; |
| |
| /* IPA passes, compilation of earlier functions or inlining |
| might have changed some properties, such as marked functions nothrow, |
| pure, const or noreturn. |
| Remove redundant edges and basic blocks, and create new ones if necessary. |
| |
| This pass can't be executed as stand alone pass from pass manager, because |
| in between inlining and this fixup the verify_flow_info would fail. */ |
| |
| unsigned int |
| execute_fixup_cfg (void) |
| { |
| basic_block bb; |
| gimple_stmt_iterator gsi; |
| int todo = gimple_in_ssa_p (cfun) ? TODO_verify_ssa : 0; |
| gcov_type count_scale; |
| edge e; |
| edge_iterator ei; |
| |
| if (ENTRY_BLOCK_PTR->count) |
| count_scale = ((cgraph_get_node (current_function_decl)->count |
| * REG_BR_PROB_BASE + ENTRY_BLOCK_PTR->count / 2) |
| / ENTRY_BLOCK_PTR->count); |
| else |
| count_scale = REG_BR_PROB_BASE; |
| |
| ENTRY_BLOCK_PTR->count = cgraph_get_node (current_function_decl)->count; |
| EXIT_BLOCK_PTR->count = (EXIT_BLOCK_PTR->count * count_scale |
| + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
| |
| FOR_EACH_EDGE (e, ei, ENTRY_BLOCK_PTR->succs) |
| e->count = (e->count * count_scale |
| + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
| |
| FOR_EACH_BB (bb) |
| { |
| bb->count = (bb->count * count_scale |
| + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
| for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| { |
| gimple stmt = gsi_stmt (gsi); |
| tree decl = is_gimple_call (stmt) |
| ? gimple_call_fndecl (stmt) |
| : NULL; |
| if (decl) |
| { |
| int flags = gimple_call_flags (stmt); |
| if (flags & (ECF_CONST | ECF_PURE | ECF_LOOPING_CONST_OR_PURE)) |
| { |
| if (gimple_purge_dead_abnormal_call_edges (bb)) |
| todo |= TODO_cleanup_cfg; |
| |
| if (gimple_in_ssa_p (cfun)) |
| { |
| todo |= TODO_update_ssa | TODO_cleanup_cfg; |
| update_stmt (stmt); |
| } |
| } |
| |
| if (flags & ECF_NORETURN |
| && fixup_noreturn_call (stmt)) |
| todo |= TODO_cleanup_cfg; |
| } |
| |
| if (maybe_clean_eh_stmt (stmt) |
| && gimple_purge_dead_eh_edges (bb)) |
| todo |= TODO_cleanup_cfg; |
| } |
| |
| FOR_EACH_EDGE (e, ei, bb->succs) |
| e->count = (e->count * count_scale |
| + REG_BR_PROB_BASE / 2) / REG_BR_PROB_BASE; |
| |
| /* If we have a basic block with no successors that does not |
| end with a control statement or a noreturn call end it with |
| a call to __builtin_unreachable. This situation can occur |
| when inlining a noreturn call that does in fact return. */ |
| if (EDGE_COUNT (bb->succs) == 0) |
| { |
| gimple stmt = last_stmt (bb); |
| if (!stmt |
| || (!is_ctrl_stmt (stmt) |
| && (!is_gimple_call (stmt) |
| || (gimple_call_flags (stmt) & ECF_NORETURN) == 0))) |
| { |
| stmt = gimple_build_call |
| (builtin_decl_implicit (BUILT_IN_UNREACHABLE), 0); |
| gimple_stmt_iterator gsi = gsi_last_bb (bb); |
| gsi_insert_after (&gsi, stmt, GSI_NEW_STMT); |
| } |
| } |
| } |
| if (count_scale != REG_BR_PROB_BASE) |
| compute_function_frequency (); |
| |
| /* We just processed all calls. */ |
| if (cfun->gimple_df) |
| vec_free (MODIFIED_NORETURN_CALLS (cfun)); |
| |
| /* Dump a textual representation of the flowgraph. */ |
| if (dump_file) |
| gimple_dump_cfg (dump_file, dump_flags); |
| |
| return todo; |
| } |
| |
| struct gimple_opt_pass pass_fixup_cfg = |
| { |
| { |
| GIMPLE_PASS, |
| "*free_cfg_annotations", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| NULL, /* gate */ |
| execute_fixup_cfg, /* execute */ |
| NULL, /* sub */ |
| NULL, /* next */ |
| 0, /* static_pass_number */ |
| TV_NONE, /* tv_id */ |
| PROP_cfg, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0 /* todo_flags_finish */ |
| } |
| }; |