| /* Callgraph construction. |
| Copyright (C) 2003-2020 Free Software Foundation, Inc. |
| Contributed by Jan Hubicka |
| |
| 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 "backend.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "tree-pass.h" |
| #include "cgraph.h" |
| #include "gimple-fold.h" |
| #include "gimple-iterator.h" |
| #include "gimple-walk.h" |
| #include "ipa-utils.h" |
| #include "except.h" |
| |
| /* Context of record_reference. */ |
| struct record_reference_ctx |
| { |
| bool only_vars; |
| struct varpool_node *varpool_node; |
| }; |
| |
| /* Walk tree and record all calls and references to functions/variables. |
| Called via walk_tree: TP is pointer to tree to be examined. |
| When DATA is non-null, record references to callgraph. |
| */ |
| |
| static tree |
| record_reference (tree *tp, int *walk_subtrees, void *data) |
| { |
| tree t = *tp; |
| tree decl; |
| record_reference_ctx *ctx = (record_reference_ctx *)data; |
| |
| t = canonicalize_constructor_val (t, NULL); |
| if (!t) |
| t = *tp; |
| else if (t != *tp) |
| *tp = t; |
| |
| switch (TREE_CODE (t)) |
| { |
| case VAR_DECL: |
| case FUNCTION_DECL: |
| gcc_unreachable (); |
| break; |
| |
| case FDESC_EXPR: |
| case ADDR_EXPR: |
| /* Record dereferences to the functions. This makes the |
| functions reachable unconditionally. */ |
| decl = get_base_var (*tp); |
| if (TREE_CODE (decl) == FUNCTION_DECL) |
| { |
| cgraph_node *node = cgraph_node::get_create (decl); |
| if (!ctx->only_vars) |
| node->mark_address_taken (); |
| ctx->varpool_node->create_reference (node, IPA_REF_ADDR); |
| } |
| |
| if (VAR_P (decl)) |
| { |
| varpool_node *vnode = varpool_node::get_create (decl); |
| ctx->varpool_node->create_reference (vnode, IPA_REF_ADDR); |
| } |
| *walk_subtrees = 0; |
| break; |
| |
| default: |
| /* Save some cycles by not walking types and declaration as we |
| won't find anything useful there anyway. */ |
| if (IS_TYPE_OR_DECL_P (*tp)) |
| { |
| *walk_subtrees = 0; |
| break; |
| } |
| break; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Record references to typeinfos in the type list LIST. */ |
| |
| static void |
| record_type_list (cgraph_node *node, tree list) |
| { |
| for (; list; list = TREE_CHAIN (list)) |
| { |
| tree type = TREE_VALUE (list); |
| |
| if (TYPE_P (type)) |
| type = lookup_type_for_runtime (type); |
| STRIP_NOPS (type); |
| if (TREE_CODE (type) == ADDR_EXPR) |
| { |
| type = TREE_OPERAND (type, 0); |
| if (VAR_P (type)) |
| { |
| varpool_node *vnode = varpool_node::get_create (type); |
| node->create_reference (vnode, IPA_REF_ADDR); |
| } |
| } |
| } |
| } |
| |
| /* Record all references we will introduce by producing EH tables |
| for NODE. */ |
| |
| static void |
| record_eh_tables (cgraph_node *node, function *fun) |
| { |
| eh_region i; |
| |
| if (DECL_FUNCTION_PERSONALITY (node->decl)) |
| { |
| tree per_decl = DECL_FUNCTION_PERSONALITY (node->decl); |
| cgraph_node *per_node = cgraph_node::get_create (per_decl); |
| |
| node->create_reference (per_node, IPA_REF_ADDR); |
| per_node->mark_address_taken (); |
| } |
| |
| i = fun->eh->region_tree; |
| if (!i) |
| return; |
| |
| while (1) |
| { |
| switch (i->type) |
| { |
| case ERT_CLEANUP: |
| case ERT_MUST_NOT_THROW: |
| break; |
| |
| case ERT_TRY: |
| { |
| eh_catch c; |
| for (c = i->u.eh_try.first_catch; c; c = c->next_catch) |
| record_type_list (node, c->type_list); |
| } |
| break; |
| |
| case ERT_ALLOWED_EXCEPTIONS: |
| record_type_list (node, i->u.allowed.type_list); |
| break; |
| } |
| /* If there are sub-regions, process them. */ |
| if (i->inner) |
| i = i->inner; |
| /* If there are peers, process them. */ |
| else if (i->next_peer) |
| i = i->next_peer; |
| /* Otherwise, step back up the tree to the next peer. */ |
| else |
| { |
| do |
| { |
| i = i->outer; |
| if (i == NULL) |
| return; |
| } |
| while (i->next_peer == NULL); |
| i = i->next_peer; |
| } |
| } |
| } |
| |
| /* Computes the frequency of the call statement so that it can be stored in |
| cgraph_edge. BB is the basic block of the call statement. */ |
| int |
| compute_call_stmt_bb_frequency (tree decl, basic_block bb) |
| { |
| return bb->count.to_cgraph_frequency |
| (ENTRY_BLOCK_PTR_FOR_FN (DECL_STRUCT_FUNCTION (decl))->count); |
| } |
| |
| /* Mark address taken in STMT. */ |
| |
| static bool |
| mark_address (gimple *stmt, tree addr, tree, void *data) |
| { |
| addr = get_base_address (addr); |
| if (TREE_CODE (addr) == FUNCTION_DECL) |
| { |
| cgraph_node *node = cgraph_node::get_create (addr); |
| node->mark_address_taken (); |
| ((symtab_node *)data)->create_reference (node, IPA_REF_ADDR, stmt); |
| } |
| else if (addr && VAR_P (addr) |
| && (TREE_STATIC (addr) || DECL_EXTERNAL (addr))) |
| { |
| varpool_node *vnode = varpool_node::get_create (addr); |
| |
| ((symtab_node *)data)->create_reference (vnode, IPA_REF_ADDR, stmt); |
| } |
| |
| return false; |
| } |
| |
| /* Mark load of T. */ |
| |
| static bool |
| mark_load (gimple *stmt, tree t, tree, void *data) |
| { |
| t = get_base_address (t); |
| if (t && TREE_CODE (t) == FUNCTION_DECL) |
| { |
| /* ??? This can happen on platforms with descriptors when these are |
| directly manipulated in the code. Pretend that it's an address. */ |
| cgraph_node *node = cgraph_node::get_create (t); |
| node->mark_address_taken (); |
| ((symtab_node *)data)->create_reference (node, IPA_REF_ADDR, stmt); |
| } |
| else if (t && VAR_P (t) && (TREE_STATIC (t) || DECL_EXTERNAL (t))) |
| { |
| varpool_node *vnode = varpool_node::get_create (t); |
| |
| ((symtab_node *)data)->create_reference (vnode, IPA_REF_LOAD, stmt); |
| } |
| return false; |
| } |
| |
| /* Mark store of T. */ |
| |
| static bool |
| mark_store (gimple *stmt, tree t, tree, void *data) |
| { |
| t = get_base_address (t); |
| if (t && VAR_P (t) && (TREE_STATIC (t) || DECL_EXTERNAL (t))) |
| { |
| varpool_node *vnode = varpool_node::get_create (t); |
| |
| ((symtab_node *)data)->create_reference (vnode, IPA_REF_STORE, stmt); |
| } |
| return false; |
| } |
| |
| /* Record all references from cgraph_node that are taken in statement STMT. */ |
| |
| void |
| cgraph_node::record_stmt_references (gimple *stmt) |
| { |
| walk_stmt_load_store_addr_ops (stmt, this, mark_load, mark_store, |
| mark_address); |
| } |
| |
| /* Create cgraph edges for function calls. |
| Also look for functions and variables having addresses taken. */ |
| |
| namespace { |
| |
| const pass_data pass_data_build_cgraph_edges = |
| { |
| GIMPLE_PASS, /* type */ |
| "*build_cgraph_edges", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| TV_NONE, /* tv_id */ |
| PROP_cfg, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0, /* todo_flags_finish */ |
| }; |
| |
| class pass_build_cgraph_edges : public gimple_opt_pass |
| { |
| public: |
| pass_build_cgraph_edges (gcc::context *ctxt) |
| : gimple_opt_pass (pass_data_build_cgraph_edges, ctxt) |
| {} |
| |
| /* opt_pass methods: */ |
| virtual unsigned int execute (function *); |
| |
| }; // class pass_build_cgraph_edges |
| |
| unsigned int |
| pass_build_cgraph_edges::execute (function *fun) |
| { |
| basic_block bb; |
| cgraph_node *node = cgraph_node::get (current_function_decl); |
| gimple_stmt_iterator gsi; |
| tree decl; |
| unsigned ix; |
| |
| /* Create the callgraph edges and record the nodes referenced by the function. |
| body. */ |
| FOR_EACH_BB_FN (bb, fun) |
| { |
| for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| { |
| gimple *stmt = gsi_stmt (gsi); |
| tree decl; |
| |
| if (is_gimple_debug (stmt)) |
| continue; |
| |
| if (gcall *call_stmt = dyn_cast <gcall *> (stmt)) |
| { |
| decl = gimple_call_fndecl (call_stmt); |
| if (decl) |
| node->create_edge (cgraph_node::get_create (decl), call_stmt, bb->count); |
| else if (gimple_call_internal_p (call_stmt)) |
| ; |
| else |
| node->create_indirect_edge (call_stmt, |
| gimple_call_flags (call_stmt), |
| bb->count); |
| } |
| node->record_stmt_references (stmt); |
| if (gomp_parallel *omp_par_stmt = dyn_cast <gomp_parallel *> (stmt)) |
| { |
| tree fn = gimple_omp_parallel_child_fn (omp_par_stmt); |
| node->create_reference (cgraph_node::get_create (fn), |
| IPA_REF_ADDR, stmt); |
| } |
| if (gimple_code (stmt) == GIMPLE_OMP_TASK) |
| { |
| tree fn = gimple_omp_task_child_fn (stmt); |
| if (fn) |
| node->create_reference (cgraph_node::get_create (fn), |
| IPA_REF_ADDR, stmt); |
| fn = gimple_omp_task_copy_fn (stmt); |
| if (fn) |
| node->create_reference (cgraph_node::get_create (fn), |
| IPA_REF_ADDR, stmt); |
| } |
| } |
| for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| node->record_stmt_references (gsi_stmt (gsi)); |
| } |
| |
| /* Look for initializers of constant variables and private statics. */ |
| FOR_EACH_LOCAL_DECL (fun, ix, decl) |
| if (VAR_P (decl) |
| && (TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
| && !DECL_HAS_VALUE_EXPR_P (decl) |
| && TREE_TYPE (decl) != error_mark_node) |
| varpool_node::finalize_decl (decl); |
| record_eh_tables (node, fun); |
| |
| return 0; |
| } |
| |
| } // anon namespace |
| |
| gimple_opt_pass * |
| make_pass_build_cgraph_edges (gcc::context *ctxt) |
| { |
| return new pass_build_cgraph_edges (ctxt); |
| } |
| |
| /* Record references to functions and other variables present in the |
| initial value of DECL, a variable. |
| When ONLY_VARS is true, we mark needed only variables, not functions. */ |
| |
| void |
| record_references_in_initializer (tree decl, bool only_vars) |
| { |
| varpool_node *node = varpool_node::get_create (decl); |
| hash_set<tree> visited_nodes; |
| record_reference_ctx ctx = {false, NULL}; |
| |
| ctx.varpool_node = node; |
| ctx.only_vars = only_vars; |
| walk_tree (&DECL_INITIAL (decl), record_reference, |
| &ctx, &visited_nodes); |
| } |
| |
| /* Rebuild cgraph edges for current function node. This needs to be run after |
| passes that don't update the cgraph. */ |
| |
| unsigned int |
| cgraph_edge::rebuild_edges (void) |
| { |
| basic_block bb; |
| cgraph_node *node = cgraph_node::get (current_function_decl); |
| gimple_stmt_iterator gsi; |
| |
| node->remove_callees (); |
| node->remove_all_references (); |
| |
| node->count = ENTRY_BLOCK_PTR_FOR_FN (cfun)->count; |
| |
| FOR_EACH_BB_FN (bb, cfun) |
| { |
| for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| { |
| gimple *stmt = gsi_stmt (gsi); |
| tree decl; |
| |
| if (gcall *call_stmt = dyn_cast <gcall *> (stmt)) |
| { |
| decl = gimple_call_fndecl (call_stmt); |
| if (decl) |
| node->create_edge (cgraph_node::get_create (decl), call_stmt, |
| bb->count); |
| else if (gimple_call_internal_p (call_stmt)) |
| ; |
| else |
| node->create_indirect_edge (call_stmt, |
| gimple_call_flags (call_stmt), |
| bb->count); |
| } |
| node->record_stmt_references (stmt); |
| } |
| for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| node->record_stmt_references (gsi_stmt (gsi)); |
| } |
| record_eh_tables (node, cfun); |
| gcc_assert (!node->inlined_to); |
| return 0; |
| } |
| |
| /* Rebuild cgraph references for current function node. This needs to be run |
| after passes that don't update the cgraph. */ |
| |
| void |
| cgraph_edge::rebuild_references (void) |
| { |
| basic_block bb; |
| cgraph_node *node = cgraph_node::get (current_function_decl); |
| gimple_stmt_iterator gsi; |
| ipa_ref *ref = NULL; |
| int i; |
| |
| /* Keep speculative references for further cgraph edge expansion. */ |
| for (i = 0; node->iterate_reference (i, ref);) |
| if (!ref->speculative) |
| ref->remove_reference (); |
| else |
| i++; |
| |
| FOR_EACH_BB_FN (bb, cfun) |
| { |
| for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| node->record_stmt_references (gsi_stmt (gsi)); |
| for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) |
| node->record_stmt_references (gsi_stmt (gsi)); |
| } |
| record_eh_tables (node, cfun); |
| } |
| |
| namespace { |
| |
| const pass_data pass_data_rebuild_cgraph_edges = |
| { |
| GIMPLE_PASS, /* type */ |
| "*rebuild_cgraph_edges", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| TV_CGRAPH, /* tv_id */ |
| PROP_cfg, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0, /* todo_flags_finish */ |
| }; |
| |
| class pass_rebuild_cgraph_edges : public gimple_opt_pass |
| { |
| public: |
| pass_rebuild_cgraph_edges (gcc::context *ctxt) |
| : gimple_opt_pass (pass_data_rebuild_cgraph_edges, ctxt) |
| {} |
| |
| /* opt_pass methods: */ |
| opt_pass * clone () { return new pass_rebuild_cgraph_edges (m_ctxt); } |
| virtual unsigned int execute (function *) |
| { |
| return cgraph_edge::rebuild_edges (); |
| } |
| |
| }; // class pass_rebuild_cgraph_edges |
| |
| } // anon namespace |
| |
| gimple_opt_pass * |
| make_pass_rebuild_cgraph_edges (gcc::context *ctxt) |
| { |
| return new pass_rebuild_cgraph_edges (ctxt); |
| } |
| |
| |
| namespace { |
| |
| const pass_data pass_data_remove_cgraph_callee_edges = |
| { |
| GIMPLE_PASS, /* type */ |
| "*remove_cgraph_callee_edges", /* name */ |
| OPTGROUP_NONE, /* optinfo_flags */ |
| TV_NONE, /* tv_id */ |
| 0, /* properties_required */ |
| 0, /* properties_provided */ |
| 0, /* properties_destroyed */ |
| 0, /* todo_flags_start */ |
| 0, /* todo_flags_finish */ |
| }; |
| |
| class pass_remove_cgraph_callee_edges : public gimple_opt_pass |
| { |
| public: |
| pass_remove_cgraph_callee_edges (gcc::context *ctxt) |
| : gimple_opt_pass (pass_data_remove_cgraph_callee_edges, ctxt) |
| {} |
| |
| /* opt_pass methods: */ |
| opt_pass * clone () { |
| return new pass_remove_cgraph_callee_edges (m_ctxt); |
| } |
| virtual unsigned int execute (function *); |
| |
| }; // class pass_remove_cgraph_callee_edges |
| |
| unsigned int |
| pass_remove_cgraph_callee_edges::execute (function *) |
| { |
| cgraph_node *node = cgraph_node::get (current_function_decl); |
| node->remove_callees (); |
| node->remove_all_references (); |
| return 0; |
| } |
| |
| } // anon namespace |
| |
| gimple_opt_pass * |
| make_pass_remove_cgraph_callee_edges (gcc::context *ctxt) |
| { |
| return new pass_remove_cgraph_callee_edges (ctxt); |
| } |