/* Callgraph handling code. 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 . */ /* This file contains basic routines manipulating call graph The call-graph is a data structure designed for inter-procedural optimization. It represents a multi-graph where nodes are functions (symbols within symbol table) and edges are call sites. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "backend.h" #include "target.h" #include "rtl.h" #include "tree.h" #include "gimple.h" #include "predict.h" #include "alloc-pool.h" #include "gimple-ssa.h" #include "cgraph.h" #include "lto-streamer.h" #include "fold-const.h" #include "varasm.h" #include "calls.h" #include "print-tree.h" #include "langhooks.h" #include "intl.h" #include "tree-eh.h" #include "gimple-iterator.h" #include "tree-cfg.h" #include "tree-ssa.h" #include "value-prof.h" #include "ipa-utils.h" #include "symbol-summary.h" #include "tree-vrp.h" #include "ipa-prop.h" #include "ipa-fnsummary.h" #include "cfgloop.h" #include "gimple-pretty-print.h" #include "tree-dfa.h" #include "profile.h" #include "context.h" #include "gimplify.h" #include "stringpool.h" #include "attribs.h" #include "selftest.h" #include "tree-into-ssa.h" #include "ipa-inline.h" /* FIXME: Only for PROP_loops, but cgraph shouldn't have to know about this. */ #include "tree-pass.h" /* Queue of cgraph nodes scheduled to be lowered. */ symtab_node *x_cgraph_nodes_queue; #define cgraph_nodes_queue ((cgraph_node *)x_cgraph_nodes_queue) /* Symbol table global context. */ symbol_table *symtab; /* List of hooks triggered on cgraph_edge events. */ struct cgraph_edge_hook_list { cgraph_edge_hook hook; void *data; struct cgraph_edge_hook_list *next; }; /* List of hooks triggered on cgraph_node events. */ struct cgraph_node_hook_list { cgraph_node_hook hook; void *data; struct cgraph_node_hook_list *next; }; /* List of hooks triggered on events involving two cgraph_edges. */ struct cgraph_2edge_hook_list { cgraph_2edge_hook hook; void *data; struct cgraph_2edge_hook_list *next; }; /* List of hooks triggered on events involving two cgraph_nodes. */ struct cgraph_2node_hook_list { cgraph_2node_hook hook; void *data; struct cgraph_2node_hook_list *next; }; /* Hash descriptor for cgraph_function_version_info. */ struct function_version_hasher : ggc_ptr_hash { static hashval_t hash (cgraph_function_version_info *); static bool equal (cgraph_function_version_info *, cgraph_function_version_info *); }; /* Map a cgraph_node to cgraph_function_version_info using this htab. The cgraph_function_version_info has a THIS_NODE field that is the corresponding cgraph_node.. */ static GTY(()) hash_table *cgraph_fnver_htab = NULL; /* Hash function for cgraph_fnver_htab. */ hashval_t function_version_hasher::hash (cgraph_function_version_info *ptr) { int uid = ptr->this_node->get_uid (); return (hashval_t)(uid); } /* eq function for cgraph_fnver_htab. */ bool function_version_hasher::equal (cgraph_function_version_info *n1, cgraph_function_version_info *n2) { return n1->this_node->get_uid () == n2->this_node->get_uid (); } /* Mark as GC root all allocated nodes. */ static GTY(()) struct cgraph_function_version_info * version_info_node = NULL; /* Return true if NODE's address can be compared. */ bool symtab_node::address_can_be_compared_p () { /* Address of virtual tables and functions is never compared. */ if (DECL_VIRTUAL_P (decl)) return false; /* Address of C++ cdtors is never compared. */ if (is_a (this) && (DECL_CXX_CONSTRUCTOR_P (decl) || DECL_CXX_DESTRUCTOR_P (decl))) return false; /* Constant pool symbols addresses are never compared. flag_merge_constants permits us to assume the same on readonly vars. */ if (is_a (this) && (DECL_IN_CONSTANT_POOL (decl) || (flag_merge_constants >= 2 && TREE_READONLY (decl) && !TREE_THIS_VOLATILE (decl)))) return false; return true; } /* Get the cgraph_function_version_info node corresponding to node. */ cgraph_function_version_info * cgraph_node::function_version (void) { cgraph_function_version_info key; key.this_node = this; if (cgraph_fnver_htab == NULL) return NULL; return cgraph_fnver_htab->find (&key); } /* Insert a new cgraph_function_version_info node into cgraph_fnver_htab corresponding to cgraph_node NODE. */ cgraph_function_version_info * cgraph_node::insert_new_function_version (void) { version_info_node = NULL; version_info_node = ggc_cleared_alloc (); version_info_node->this_node = this; if (cgraph_fnver_htab == NULL) cgraph_fnver_htab = hash_table::create_ggc (2); *cgraph_fnver_htab->find_slot (version_info_node, INSERT) = version_info_node; return version_info_node; } /* Remove the cgraph_function_version_info node given by DECL_V. */ static void delete_function_version (cgraph_function_version_info *decl_v) { if (decl_v == NULL) return; if (version_info_node == decl_v) version_info_node = NULL; if (decl_v->prev != NULL) decl_v->prev->next = decl_v->next; if (decl_v->next != NULL) decl_v->next->prev = decl_v->prev; if (cgraph_fnver_htab != NULL) cgraph_fnver_htab->remove_elt (decl_v); } /* Remove the cgraph_function_version_info and cgraph_node for DECL. This DECL is a duplicate declaration. */ void cgraph_node::delete_function_version_by_decl (tree decl) { cgraph_node *decl_node = cgraph_node::get (decl); if (decl_node == NULL) return; delete_function_version (decl_node->function_version ()); decl_node->remove (); } /* Record that DECL1 and DECL2 are semantically identical function versions. */ void cgraph_node::record_function_versions (tree decl1, tree decl2) { cgraph_node *decl1_node = cgraph_node::get_create (decl1); cgraph_node *decl2_node = cgraph_node::get_create (decl2); cgraph_function_version_info *decl1_v = NULL; cgraph_function_version_info *decl2_v = NULL; cgraph_function_version_info *before; cgraph_function_version_info *after; gcc_assert (decl1_node != NULL && decl2_node != NULL); decl1_v = decl1_node->function_version (); decl2_v = decl2_node->function_version (); if (decl1_v != NULL && decl2_v != NULL) return; if (decl1_v == NULL) decl1_v = decl1_node->insert_new_function_version (); if (decl2_v == NULL) decl2_v = decl2_node->insert_new_function_version (); /* Chain decl2_v and decl1_v. All semantically identical versions will be chained together. */ before = decl1_v; after = decl2_v; while (before->next != NULL) before = before->next; while (after->prev != NULL) after= after->prev; before->next = after; after->prev = before; } /* Initialize callgraph dump file. */ void symbol_table::initialize (void) { if (!dump_file) dump_file = dump_begin (TDI_cgraph, NULL); if (!ipa_clones_dump_file) ipa_clones_dump_file = dump_begin (TDI_clones, NULL); } /* Allocate new callgraph node and insert it into basic data structures. */ cgraph_node * symbol_table::create_empty (void) { cgraph_count++; return new (ggc_alloc ()) cgraph_node (cgraph_max_uid++); } /* Register HOOK to be called with DATA on each removed edge. */ cgraph_edge_hook_list * symbol_table::add_edge_removal_hook (cgraph_edge_hook hook, void *data) { cgraph_edge_hook_list *entry; cgraph_edge_hook_list **ptr = &m_first_edge_removal_hook; entry = (cgraph_edge_hook_list *) xmalloc (sizeof (*entry)); entry->hook = hook; entry->data = data; entry->next = NULL; while (*ptr) ptr = &(*ptr)->next; *ptr = entry; return entry; } /* Remove ENTRY from the list of hooks called on removing edges. */ void symbol_table::remove_edge_removal_hook (cgraph_edge_hook_list *entry) { cgraph_edge_hook_list **ptr = &m_first_edge_removal_hook; while (*ptr != entry) ptr = &(*ptr)->next; *ptr = entry->next; free (entry); } /* Call all edge removal hooks. */ void symbol_table::call_edge_removal_hooks (cgraph_edge *e) { cgraph_edge_hook_list *entry = m_first_edge_removal_hook; while (entry) { entry->hook (e, entry->data); entry = entry->next; } } /* Register HOOK to be called with DATA on each removed node. */ cgraph_node_hook_list * symbol_table::add_cgraph_removal_hook (cgraph_node_hook hook, void *data) { cgraph_node_hook_list *entry; cgraph_node_hook_list **ptr = &m_first_cgraph_removal_hook; entry = (cgraph_node_hook_list *) xmalloc (sizeof (*entry)); entry->hook = hook; entry->data = data; entry->next = NULL; while (*ptr) ptr = &(*ptr)->next; *ptr = entry; return entry; } /* Remove ENTRY from the list of hooks called on removing nodes. */ void symbol_table::remove_cgraph_removal_hook (cgraph_node_hook_list *entry) { cgraph_node_hook_list **ptr = &m_first_cgraph_removal_hook; while (*ptr != entry) ptr = &(*ptr)->next; *ptr = entry->next; free (entry); } /* Call all node removal hooks. */ void symbol_table::call_cgraph_removal_hooks (cgraph_node *node) { cgraph_node_hook_list *entry = m_first_cgraph_removal_hook; while (entry) { entry->hook (node, entry->data); entry = entry->next; } } /* Call all node removal hooks. */ void symbol_table::call_cgraph_insertion_hooks (cgraph_node *node) { cgraph_node_hook_list *entry = m_first_cgraph_insertion_hook; while (entry) { entry->hook (node, entry->data); entry = entry->next; } } /* Register HOOK to be called with DATA on each inserted node. */ cgraph_node_hook_list * symbol_table::add_cgraph_insertion_hook (cgraph_node_hook hook, void *data) { cgraph_node_hook_list *entry; cgraph_node_hook_list **ptr = &m_first_cgraph_insertion_hook; entry = (cgraph_node_hook_list *) xmalloc (sizeof (*entry)); entry->hook = hook; entry->data = data; entry->next = NULL; while (*ptr) ptr = &(*ptr)->next; *ptr = entry; return entry; } /* Remove ENTRY from the list of hooks called on inserted nodes. */ void symbol_table::remove_cgraph_insertion_hook (cgraph_node_hook_list *entry) { cgraph_node_hook_list **ptr = &m_first_cgraph_insertion_hook; while (*ptr != entry) ptr = &(*ptr)->next; *ptr = entry->next; free (entry); } /* Register HOOK to be called with DATA on each duplicated edge. */ cgraph_2edge_hook_list * symbol_table::add_edge_duplication_hook (cgraph_2edge_hook hook, void *data) { cgraph_2edge_hook_list *entry; cgraph_2edge_hook_list **ptr = &m_first_edge_duplicated_hook; entry = (cgraph_2edge_hook_list *) xmalloc (sizeof (*entry)); entry->hook = hook; entry->data = data; entry->next = NULL; while (*ptr) ptr = &(*ptr)->next; *ptr = entry; return entry; } /* Remove ENTRY from the list of hooks called on duplicating edges. */ void symbol_table::remove_edge_duplication_hook (cgraph_2edge_hook_list *entry) { cgraph_2edge_hook_list **ptr = &m_first_edge_duplicated_hook; while (*ptr != entry) ptr = &(*ptr)->next; *ptr = entry->next; free (entry); } /* Call all edge duplication hooks. */ void symbol_table::call_edge_duplication_hooks (cgraph_edge *cs1, cgraph_edge *cs2) { cgraph_2edge_hook_list *entry = m_first_edge_duplicated_hook; while (entry) { entry->hook (cs1, cs2, entry->data); entry = entry->next; } } /* Register HOOK to be called with DATA on each duplicated node. */ cgraph_2node_hook_list * symbol_table::add_cgraph_duplication_hook (cgraph_2node_hook hook, void *data) { cgraph_2node_hook_list *entry; cgraph_2node_hook_list **ptr = &m_first_cgraph_duplicated_hook; entry = (cgraph_2node_hook_list *) xmalloc (sizeof (*entry)); entry->hook = hook; entry->data = data; entry->next = NULL; while (*ptr) ptr = &(*ptr)->next; *ptr = entry; return entry; } /* Remove ENTRY from the list of hooks called on duplicating nodes. */ void symbol_table::remove_cgraph_duplication_hook (cgraph_2node_hook_list *entry) { cgraph_2node_hook_list **ptr = &m_first_cgraph_duplicated_hook; while (*ptr != entry) ptr = &(*ptr)->next; *ptr = entry->next; free (entry); } /* Call all node duplication hooks. */ void symbol_table::call_cgraph_duplication_hooks (cgraph_node *node, cgraph_node *node2) { cgraph_2node_hook_list *entry = m_first_cgraph_duplicated_hook; while (entry) { entry->hook (node, node2, entry->data); entry = entry->next; } } /* Return cgraph node assigned to DECL. Create new one when needed. */ cgraph_node * cgraph_node::create (tree decl) { cgraph_node *node = symtab->create_empty (); gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); node->decl = decl; if ((flag_openacc || flag_openmp) && lookup_attribute ("omp declare target", DECL_ATTRIBUTES (decl))) { node->offloadable = 1; if (ENABLE_OFFLOADING) g->have_offload = true; } if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl))) node->ifunc_resolver = true; node->register_symbol (); if (DECL_CONTEXT (decl) && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL) { node->origin = cgraph_node::get_create (DECL_CONTEXT (decl)); node->next_nested = node->origin->nested; node->origin->nested = node; } return node; } /* Try to find a call graph node for declaration DECL and if it does not exist or if it corresponds to an inline clone, create a new one. */ cgraph_node * cgraph_node::get_create (tree decl) { cgraph_node *first_clone = cgraph_node::get (decl); if (first_clone && !first_clone->inlined_to) return first_clone; cgraph_node *node = cgraph_node::create (decl); if (first_clone) { first_clone->clone_of = node; node->clones = first_clone; node->order = first_clone->order; symtab->symtab_prevail_in_asm_name_hash (node); node->decl->decl_with_vis.symtab_node = node; if (dump_file) fprintf (dump_file, "Introduced new external node " "(%s) and turned into root of the clone tree.\n", node->dump_name ()); } else if (dump_file) fprintf (dump_file, "Introduced new external node " "(%s).\n", node->dump_name ()); return node; } /* Mark ALIAS as an alias to DECL. DECL_NODE is cgraph node representing the function body is associated with (not necessarily cgraph_node (DECL)). */ cgraph_node * cgraph_node::create_alias (tree alias, tree target) { cgraph_node *alias_node; gcc_assert (TREE_CODE (target) == FUNCTION_DECL || TREE_CODE (target) == IDENTIFIER_NODE); gcc_assert (TREE_CODE (alias) == FUNCTION_DECL); alias_node = cgraph_node::get_create (alias); gcc_assert (!alias_node->definition); alias_node->alias_target = target; alias_node->definition = true; alias_node->alias = true; if (lookup_attribute ("weakref", DECL_ATTRIBUTES (alias)) != NULL) alias_node->transparent_alias = alias_node->weakref = true; if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (alias))) alias_node->ifunc_resolver = true; return alias_node; } /* Attempt to mark ALIAS as an alias to DECL. Return alias node if successful and NULL otherwise. Same body aliases are output whenever the body of DECL is output, and cgraph_node::get (ALIAS) transparently returns cgraph_node::get (DECL). */ cgraph_node * cgraph_node::create_same_body_alias (tree alias, tree decl) { cgraph_node *n; /* If aliases aren't supported by the assembler, fail. */ if (!TARGET_SUPPORTS_ALIASES) return NULL; /* Langhooks can create same body aliases of symbols not defined. Those are useless. Drop them on the floor. */ if (symtab->global_info_ready) return NULL; n = cgraph_node::create_alias (alias, decl); n->cpp_implicit_alias = true; if (symtab->cpp_implicit_aliases_done) n->resolve_alias (cgraph_node::get (decl)); return n; } /* Add thunk alias into callgraph. The alias declaration is ALIAS and it aliases DECL with an adjustments made into the first parameter. See comments in struct cgraph_thunk_info for detail on the parameters. */ cgraph_node * cgraph_node::create_thunk (tree alias, tree, bool this_adjusting, HOST_WIDE_INT fixed_offset, HOST_WIDE_INT virtual_value, HOST_WIDE_INT indirect_offset, tree virtual_offset, tree real_alias) { cgraph_node *node; node = cgraph_node::get (alias); if (node) node->reset (); else node = cgraph_node::create (alias); /* Make sure that if VIRTUAL_OFFSET is in sync with VIRTUAL_VALUE. */ gcc_checking_assert (virtual_offset ? virtual_value == wi::to_wide (virtual_offset) : virtual_value == 0); node->thunk.fixed_offset = fixed_offset; node->thunk.virtual_value = virtual_value; node->thunk.indirect_offset = indirect_offset; node->thunk.alias = real_alias; node->thunk.this_adjusting = this_adjusting; node->thunk.virtual_offset_p = virtual_offset != NULL; node->thunk.thunk_p = true; node->definition = true; return node; } /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME. Return NULL if there's no such node. */ cgraph_node * cgraph_node::get_for_asmname (tree asmname) { /* We do not want to look at inline clones. */ for (symtab_node *node = symtab_node::get_for_asmname (asmname); node; node = node->next_sharing_asm_name) { cgraph_node *cn = dyn_cast (node); if (cn && !cn->inlined_to) return cn; } return NULL; } /* Returns a hash value for X (which really is a cgraph_edge). */ hashval_t cgraph_edge_hasher::hash (cgraph_edge *e) { /* This is a really poor hash function, but it is what htab_hash_pointer uses. */ return (hashval_t) ((intptr_t)e->call_stmt >> 3); } /* Returns a hash value for X (which really is a cgraph_edge). */ hashval_t cgraph_edge_hasher::hash (gimple *call_stmt) { /* This is a really poor hash function, but it is what htab_hash_pointer uses. */ return (hashval_t) ((intptr_t)call_stmt >> 3); } /* Return nonzero if the call_stmt of cgraph_edge X is stmt *Y. */ inline bool cgraph_edge_hasher::equal (cgraph_edge *x, gimple *y) { return x->call_stmt == y; } /* Add call graph edge E to call site hash of its caller. */ static inline void cgraph_update_edge_in_call_site_hash (cgraph_edge *e) { gimple *call = e->call_stmt; *e->caller->call_site_hash->find_slot_with_hash (call, cgraph_edge_hasher::hash (call), INSERT) = e; } /* Add call graph edge E to call site hash of its caller. */ static inline void cgraph_add_edge_to_call_site_hash (cgraph_edge *e) { /* There are two speculative edges for every statement (one direct, one indirect); always hash the direct one. */ if (e->speculative && e->indirect_unknown_callee) return; cgraph_edge **slot = e->caller->call_site_hash->find_slot_with_hash (e->call_stmt, cgraph_edge_hasher::hash (e->call_stmt), INSERT); if (*slot) { gcc_assert (((cgraph_edge *)*slot)->speculative); if (e->callee && (!e->prev_callee || !e->prev_callee->speculative || e->prev_callee->call_stmt != e->call_stmt)) *slot = e; return; } gcc_assert (!*slot || e->speculative); *slot = e; } /* Return the callgraph edge representing the GIMPLE_CALL statement CALL_STMT. */ cgraph_edge * cgraph_node::get_edge (gimple *call_stmt) { cgraph_edge *e, *e2; int n = 0; if (call_site_hash) return call_site_hash->find_with_hash (call_stmt, cgraph_edge_hasher::hash (call_stmt)); /* This loop may turn out to be performance problem. In such case adding hashtables into call nodes with very many edges is probably best solution. It is not good idea to add pointer into CALL_EXPR itself because we want to make possible having multiple cgraph nodes representing different clones of the same body before the body is actually cloned. */ for (e = callees; e; e = e->next_callee) { if (e->call_stmt == call_stmt) break; n++; } if (!e) for (e = indirect_calls; e; e = e->next_callee) { if (e->call_stmt == call_stmt) break; n++; } if (n > 100) { call_site_hash = hash_table::create_ggc (120); for (e2 = callees; e2; e2 = e2->next_callee) cgraph_add_edge_to_call_site_hash (e2); for (e2 = indirect_calls; e2; e2 = e2->next_callee) cgraph_add_edge_to_call_site_hash (e2); } return e; } /* Change field call_stmt of edge E to NEW_STMT. If UPDATE_SPECULATIVE and E is any component of speculative edge, then update all components. Speculations can be resolved in the process and EDGE can be removed and deallocated. Return the edge that now represents the call. */ cgraph_edge * cgraph_edge::set_call_stmt (cgraph_edge *e, gcall *new_stmt, bool update_speculative) { tree decl; cgraph_node *new_direct_callee = NULL; if ((e->indirect_unknown_callee || e->speculative) && (decl = gimple_call_fndecl (new_stmt))) { /* Constant propagation and especially inlining can turn an indirect call into a direct one. */ new_direct_callee = cgraph_node::get (decl); gcc_checking_assert (new_direct_callee); } /* Speculative edges has three component, update all of them when asked to. */ if (update_speculative && e->speculative /* If we are about to resolve the speculation by calling make_direct below, do not bother going over all the speculative edges now. */ && !new_direct_callee) { cgraph_edge *direct, *indirect, *next; ipa_ref *ref; bool e_indirect = e->indirect_unknown_callee; int n = 0; direct = e->first_speculative_call_target (); indirect = e->speculative_call_indirect_edge (); gcall *old_stmt = direct->call_stmt; for (cgraph_edge *d = direct; d; d = next) { next = d->next_speculative_call_target (); cgraph_edge *d2 = set_call_stmt (d, new_stmt, false); gcc_assert (d2 == d); n++; } gcc_checking_assert (indirect->num_speculative_call_targets_p () == n); for (unsigned int i = 0; e->caller->iterate_reference (i, ref); i++) if (ref->speculative && ref->stmt == old_stmt) { ref->stmt = new_stmt; n--; } indirect = set_call_stmt (indirect, new_stmt, false); return e_indirect ? indirect : direct; } if (new_direct_callee) e = make_direct (e, new_direct_callee); /* Only direct speculative edges go to call_site_hash. */ if (e->caller->call_site_hash && (!e->speculative || !e->indirect_unknown_callee) /* It is possible that edge was previously speculative. In this case we have different value in call stmt hash which needs preserving. */ && e->caller->get_edge (e->call_stmt) == e) e->caller->call_site_hash->remove_elt_with_hash (e->call_stmt, cgraph_edge_hasher::hash (e->call_stmt)); e->call_stmt = new_stmt; function *fun = DECL_STRUCT_FUNCTION (e->caller->decl); e->can_throw_external = stmt_can_throw_external (fun, new_stmt); /* Update call stite hash. For speculative calls we only record the first direct edge. */ if (e->caller->call_site_hash && (!e->speculative || (e->callee && (!e->prev_callee || !e->prev_callee->speculative || e->prev_callee->call_stmt != e->call_stmt)) || (e->speculative && !e->callee))) cgraph_add_edge_to_call_site_hash (e); return e; } /* Allocate a cgraph_edge structure and fill it with data according to the parameters of which only CALLEE can be NULL (when creating an indirect call edge). CLONING_P should be set if properties that are copied from an original edge should not be calculated. */ cgraph_edge * symbol_table::create_edge (cgraph_node *caller, cgraph_node *callee, gcall *call_stmt, profile_count count, bool indir_unknown_callee, bool cloning_p) { cgraph_edge *edge; /* LTO does not actually have access to the call_stmt since these have not been loaded yet. */ if (call_stmt) { /* This is a rather expensive check possibly triggering construction of call stmt hashtable. */ cgraph_edge *e; gcc_checking_assert (!(e = caller->get_edge (call_stmt)) || e->speculative); gcc_assert (is_gimple_call (call_stmt)); } edge = ggc_alloc (); edge->m_summary_id = -1; edges_count++; gcc_assert (++edges_max_uid != 0); edge->m_uid = edges_max_uid; edge->aux = NULL; edge->caller = caller; edge->callee = callee; edge->prev_caller = NULL; edge->next_caller = NULL; edge->prev_callee = NULL; edge->next_callee = NULL; edge->lto_stmt_uid = 0; edge->speculative_id = 0; edge->count = count; edge->call_stmt = call_stmt; edge->indirect_info = NULL; edge->indirect_inlining_edge = 0; edge->speculative = false; edge->indirect_unknown_callee = indir_unknown_callee; if (call_stmt && caller->call_site_hash) cgraph_add_edge_to_call_site_hash (edge); if (cloning_p) return edge; edge->can_throw_external = call_stmt ? stmt_can_throw_external (DECL_STRUCT_FUNCTION (caller->decl), call_stmt) : false; edge->inline_failed = CIF_FUNCTION_NOT_CONSIDERED; edge->call_stmt_cannot_inline_p = false; if (opt_for_fn (edge->caller->decl, flag_devirtualize) && call_stmt && DECL_STRUCT_FUNCTION (caller->decl)) edge->in_polymorphic_cdtor = decl_maybe_in_construction_p (NULL, NULL, call_stmt, caller->decl); else edge->in_polymorphic_cdtor = caller->thunk.thunk_p; if (callee && symtab->state != LTO_STREAMING && edge->callee->comdat_local_p ()) edge->caller->calls_comdat_local = true; return edge; } /* Create edge from a given function to CALLEE in the cgraph. CLONING_P should be set if properties that are copied from an original edge should not be calculated. */ cgraph_edge * cgraph_node::create_edge (cgraph_node *callee, gcall *call_stmt, profile_count count, bool cloning_p) { cgraph_edge *edge = symtab->create_edge (this, callee, call_stmt, count, false, cloning_p); if (!cloning_p) initialize_inline_failed (edge); edge->next_caller = callee->callers; if (callee->callers) callee->callers->prev_caller = edge; edge->next_callee = callees; if (callees) callees->prev_callee = edge; callees = edge; callee->callers = edge; return edge; } /* Allocate cgraph_indirect_call_info and set its fields to default values. */ cgraph_indirect_call_info * cgraph_allocate_init_indirect_info (void) { cgraph_indirect_call_info *ii; ii = ggc_cleared_alloc (); ii->param_index = -1; return ii; } /* Create an indirect edge with a yet-undetermined callee where the call statement destination is a formal parameter of the caller with index PARAM_INDEX. CLONING_P should be set if properties that are copied from an original edge should not be calculated and indirect_info structure should not be calculated. */ cgraph_edge * cgraph_node::create_indirect_edge (gcall *call_stmt, int ecf_flags, profile_count count, bool cloning_p) { cgraph_edge *edge = symtab->create_edge (this, NULL, call_stmt, count, true, cloning_p); tree target; if (!cloning_p) initialize_inline_failed (edge); edge->indirect_info = cgraph_allocate_init_indirect_info (); edge->indirect_info->ecf_flags = ecf_flags; edge->indirect_info->vptr_changed = true; /* Record polymorphic call info. */ if (!cloning_p && call_stmt && (target = gimple_call_fn (call_stmt)) && virtual_method_call_p (target)) { ipa_polymorphic_call_context context (decl, target, call_stmt); /* Only record types can have virtual calls. */ edge->indirect_info->polymorphic = true; edge->indirect_info->param_index = -1; edge->indirect_info->otr_token = tree_to_uhwi (OBJ_TYPE_REF_TOKEN (target)); edge->indirect_info->otr_type = obj_type_ref_class (target); gcc_assert (TREE_CODE (edge->indirect_info->otr_type) == RECORD_TYPE); edge->indirect_info->context = context; } edge->next_callee = indirect_calls; if (indirect_calls) indirect_calls->prev_callee = edge; indirect_calls = edge; return edge; } /* Remove the edge from the list of the callees of the caller. */ void cgraph_edge::remove_caller (void) { if (prev_callee) prev_callee->next_callee = next_callee; if (next_callee) next_callee->prev_callee = prev_callee; if (!prev_callee) { if (indirect_unknown_callee) caller->indirect_calls = next_callee; else caller->callees = next_callee; } if (caller->call_site_hash && this == caller->get_edge (call_stmt)) caller->call_site_hash->remove_elt_with_hash (call_stmt, cgraph_edge_hasher::hash (call_stmt)); } /* Put the edge onto the free list. */ void symbol_table::free_edge (cgraph_edge *e) { edges_count--; if (e->m_summary_id != -1) edge_released_summary_ids.safe_push (e->m_summary_id); if (e->indirect_info) ggc_free (e->indirect_info); ggc_free (e); } /* Remove the edge in the cgraph. */ void cgraph_edge::remove (cgraph_edge *edge) { /* Call all edge removal hooks. */ symtab->call_edge_removal_hooks (edge); if (!edge->indirect_unknown_callee) /* Remove from callers list of the callee. */ edge->remove_callee (); /* Remove from callees list of the callers. */ edge->remove_caller (); /* Put the edge onto the free list. */ symtab->free_edge (edge); } /* Turn edge into speculative call calling N2. Update the profile so the direct call is taken COUNT times with FREQUENCY. At clone materialization time, the indirect call E will be expanded as: if (call_dest == N2) n2 (); else call call_dest At this time the function just creates the direct call, the reference representing the if conditional and attaches them all to the original indirect call statement. speculative_id is used to link direct calls with their corresponding IPA_REF_ADDR references when representing speculative calls. Return direct edge created. */ cgraph_edge * cgraph_edge::make_speculative (cgraph_node *n2, profile_count direct_count, unsigned int speculative_id) { cgraph_node *n = caller; ipa_ref *ref = NULL; cgraph_edge *e2; if (dump_file) fprintf (dump_file, "Indirect call -> speculative call %s => %s\n", n->dump_name (), n2->dump_name ()); speculative = true; e2 = n->create_edge (n2, call_stmt, direct_count); initialize_inline_failed (e2); e2->speculative = true; if (TREE_NOTHROW (n2->decl)) e2->can_throw_external = false; else e2->can_throw_external = can_throw_external; e2->lto_stmt_uid = lto_stmt_uid; e2->speculative_id = speculative_id; e2->in_polymorphic_cdtor = in_polymorphic_cdtor; indirect_info->num_speculative_call_targets++; count -= e2->count; symtab->call_edge_duplication_hooks (this, e2); ref = n->create_reference (n2, IPA_REF_ADDR, call_stmt); ref->lto_stmt_uid = lto_stmt_uid; ref->speculative_id = speculative_id; ref->speculative = speculative; n2->mark_address_taken (); return e2; } /* Speculative call consists of an indirect edge and one or more direct edge+ref pairs. Given an edge which is part of speculative call, return the first direct call edge in the speculative call sequence. */ cgraph_edge * cgraph_edge::first_speculative_call_target () { cgraph_edge *e = this; gcc_checking_assert (e->speculative); if (e->callee) { while (e->prev_callee && e->prev_callee->speculative && e->prev_callee->call_stmt == e->call_stmt && e->prev_callee->lto_stmt_uid == e->lto_stmt_uid) e = e->prev_callee; return e; } /* Call stmt site hash always points to the first target of the speculative call sequence. */ if (e->call_stmt) return e->caller->get_edge (e->call_stmt); for (cgraph_edge *e2 = e->caller->callees; true; e2 = e2->next_callee) if (e2->speculative && e->call_stmt == e2->call_stmt && e->lto_stmt_uid == e2->lto_stmt_uid) return e2; } /* We always maintain first direct edge in the call site hash, if one exists. E is going to be removed. See if it is first one and update hash accordingly. INDIRECT is the indirect edge of speculative call. We assume that INDIRECT->num_speculative_call_targets_p () is already updated for removal of E. */ static void update_call_stmt_hash_for_removing_direct_edge (cgraph_edge *e, cgraph_edge *indirect) { if (e->caller->call_site_hash) { if (e->caller->get_edge (e->call_stmt) != e) ; else if (!indirect->num_speculative_call_targets_p ()) cgraph_update_edge_in_call_site_hash (indirect); else { gcc_checking_assert (e->next_callee && e->next_callee->speculative && e->next_callee->call_stmt == e->call_stmt); cgraph_update_edge_in_call_site_hash (e->next_callee); } } } /* Speculative call EDGE turned out to be direct call to CALLEE_DECL. Remove the speculative call sequence and return edge representing the call, the original EDGE can be removed and deallocated. Return the edge that now represents the call. For "speculative" indirect call that contains multiple "speculative" targets (i.e. edge->indirect_info->num_speculative_call_targets > 1), decrease the count and only remove current direct edge. If no speculative direct call left to the speculative indirect call, remove the speculative of both the indirect call and corresponding direct edge. It is up to caller to iteratively resolve each "speculative" direct call and redirect the call as appropriate. */ cgraph_edge * cgraph_edge::resolve_speculation (cgraph_edge *edge, tree callee_decl) { cgraph_edge *e2; ipa_ref *ref; gcc_assert (edge->speculative && (!callee_decl || edge->callee)); if (!edge->callee) e2 = edge->first_speculative_call_target (); else e2 = edge; ref = e2->speculative_call_target_ref (); edge = edge->speculative_call_indirect_edge (); if (!callee_decl || !ref->referred->semantically_equivalent_p (symtab_node::get (callee_decl))) { if (dump_file) { if (callee_decl) { fprintf (dump_file, "Speculative indirect call %s => %s has " "turned out to have contradicting known target ", edge->caller->dump_name (), e2->callee->dump_name ()); print_generic_expr (dump_file, callee_decl); fprintf (dump_file, "\n"); } else { fprintf (dump_file, "Removing speculative call %s => %s\n", edge->caller->dump_name (), e2->callee->dump_name ()); } } } else { cgraph_edge *tmp = edge; if (dump_file) fprintf (dump_file, "Speculative call turned into direct call.\n"); edge = e2; e2 = tmp; /* FIXME: If EDGE is inlined, we should scale up the frequencies and counts in the functions inlined through it. */ } edge->count += e2->count; if (edge->num_speculative_call_targets_p ()) { /* The indirect edge has multiple speculative targets, don't remove speculative until all related direct edges are resolved. */ edge->indirect_info->num_speculative_call_targets--; if (!edge->indirect_info->num_speculative_call_targets) edge->speculative = false; } else edge->speculative = false; e2->speculative = false; update_call_stmt_hash_for_removing_direct_edge (e2, edge); ref->remove_reference (); if (e2->indirect_unknown_callee || e2->inline_failed) remove (e2); else e2->callee->remove_symbol_and_inline_clones (); return edge; } /* Return edge corresponding to speculative call to a given target. NULL if speculative call does not have one. */ cgraph_edge * cgraph_edge::speculative_call_for_target (cgraph_node *target) { for (cgraph_edge *direct = first_speculative_call_target (); direct; direct = direct->next_speculative_call_target ()) if (direct->speculative_call_target_ref () ->referred->semantically_equivalent_p (target)) return direct; return NULL; } /* Make an indirect or speculative EDGE with an unknown callee an ordinary edge leading to CALLEE. Speculations can be resolved in the process and EDGE can be removed and deallocated. Return the edge that now represents the call. */ cgraph_edge * cgraph_edge::make_direct (cgraph_edge *edge, cgraph_node *callee) { gcc_assert (edge->indirect_unknown_callee || edge->speculative); /* If we are redirecting speculative call, make it non-speculative. */ if (edge->speculative) { cgraph_edge *found = NULL; cgraph_edge *direct, *next; edge = edge->speculative_call_indirect_edge (); /* Look all speculative targets and remove all but one corresponding to callee (if it exists). */ for (direct = edge->first_speculative_call_target (); direct; direct = next) { next = direct->next_speculative_call_target (); /* Compare ref not direct->callee. Direct edge is possibly inlined or redirected. */ if (!direct->speculative_call_target_ref () ->referred->semantically_equivalent_p (callee)) edge = direct->resolve_speculation (direct, NULL); else { gcc_checking_assert (!found); found = direct; } } /* On successful speculation just remove the indirect edge and return the pre existing direct edge. It is important to not remove it and redirect because the direct edge may be inlined or redirected. */ if (found) { cgraph_edge *e2 = resolve_speculation (found, callee->decl); gcc_checking_assert (!found->speculative && e2 == found); return found; } gcc_checking_assert (!edge->speculative); } edge->indirect_unknown_callee = 0; ggc_free (edge->indirect_info); edge->indirect_info = NULL; /* Get the edge out of the indirect edge list. */ if (edge->prev_callee) edge->prev_callee->next_callee = edge->next_callee; if (edge->next_callee) edge->next_callee->prev_callee = edge->prev_callee; if (!edge->prev_callee) edge->caller->indirect_calls = edge->next_callee; /* Put it into the normal callee list */ edge->prev_callee = NULL; edge->next_callee = edge->caller->callees; if (edge->caller->callees) edge->caller->callees->prev_callee = edge; edge->caller->callees = edge; /* Insert to callers list of the new callee. */ edge->set_callee (callee); /* We need to re-determine the inlining status of the edge. */ initialize_inline_failed (edge); return edge; } /* Redirect callee of the edge to N. The function does not update underlying call expression. */ void cgraph_edge::redirect_callee (cgraph_node *n) { bool loc = callee->comdat_local_p (); /* Remove from callers list of the current callee. */ remove_callee (); /* Insert to callers list of the new callee. */ set_callee (n); if (!inline_failed) return; if (!loc && n->comdat_local_p ()) { cgraph_node *to = caller->inlined_to ? caller->inlined_to : caller; to->calls_comdat_local = true; } else if (loc && !n->comdat_local_p ()) { cgraph_node *to = caller->inlined_to ? caller->inlined_to : caller; gcc_checking_assert (to->calls_comdat_local); to->calls_comdat_local = to->check_calls_comdat_local_p (); } } /* If necessary, change the function declaration in the call statement associated with E so that it corresponds to the edge callee. Speculations can be resolved in the process and EDGE can be removed and deallocated. The edge could be one of speculative direct call generated from speculative indirect call. In this circumstance, decrease the speculative targets count (i.e. num_speculative_call_targets) and redirect call stmt to the corresponding i-th target. If no speculative direct call left to the speculative indirect call, remove "speculative" of the indirect call and also redirect stmt to it's final direct target. It is up to caller to iteratively transform each "speculative" direct call as appropriate. */ gimple * cgraph_edge::redirect_call_stmt_to_callee (cgraph_edge *e) { tree decl = gimple_call_fndecl (e->call_stmt); gcall *new_stmt; gimple_stmt_iterator gsi; if (e->speculative) { /* If there already is an direct call (i.e. as a result of inliner's substitution), forget about speculating. */ if (decl) e = make_direct (e->speculative_call_indirect_edge (), cgraph_node::get (decl)); else { /* Be sure we redirect all speculative targets before poking abou tindirect edge. */ gcc_checking_assert (e->callee); cgraph_edge *indirect = e->speculative_call_indirect_edge (); gcall *new_stmt; ipa_ref *ref; /* Expand speculation into GIMPLE code. */ if (dump_file) { fprintf (dump_file, "Expanding speculative call of %s -> %s count: ", e->caller->dump_name (), e->callee->dump_name ()); e->count.dump (dump_file); fprintf (dump_file, "\n"); } push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl)); profile_count all = indirect->count; for (cgraph_edge *e2 = e->first_speculative_call_target (); e2; e2 = e2->next_speculative_call_target ()) all = all + e2->count; profile_probability prob = e->count.probability_in (all); if (!prob.initialized_p ()) prob = profile_probability::even (); ref = e->speculative_call_target_ref (); new_stmt = gimple_ic (e->call_stmt, dyn_cast (ref->referred), prob); e->speculative = false; if (indirect->num_speculative_call_targets_p ()) { /* The indirect edge has multiple speculative targets, don't remove speculative until all related direct edges are redirected. */ indirect->indirect_info->num_speculative_call_targets--; if (!indirect->indirect_info->num_speculative_call_targets) indirect->speculative = false; } else indirect->speculative = false; /* Indirect edges are not both in the call site hash. get it updated. */ update_call_stmt_hash_for_removing_direct_edge (e, indirect); cgraph_edge::set_call_stmt (e, new_stmt, false); e->count = gimple_bb (e->call_stmt)->count; /* Once we are done with expanding the sequence, update also indirect call probability. Until then the basic block accounts for the sum of indirect edge and all non-expanded speculations. */ if (!indirect->speculative) indirect->count = gimple_bb (indirect->call_stmt)->count; ref->speculative = false; ref->stmt = NULL; pop_cfun (); /* Continue redirecting E to proper target. */ } } if (e->indirect_unknown_callee || decl == e->callee->decl) return e->call_stmt; if (decl && ipa_saved_clone_sources) { tree *p = ipa_saved_clone_sources->get (e->callee); if (p && decl == *p) { gimple_call_set_fndecl (e->call_stmt, e->callee->decl); return e->call_stmt; } } if (flag_checking && decl) { cgraph_node *node = cgraph_node::get (decl); gcc_assert (!node || !node->clone.param_adjustments); } if (symtab->dump_file) { fprintf (symtab->dump_file, "updating call of %s -> %s: ", e->caller->dump_name (), e->callee->dump_name ()); print_gimple_stmt (symtab->dump_file, e->call_stmt, 0, dump_flags); if (e->callee->clone.param_adjustments) e->callee->clone.param_adjustments->dump (symtab->dump_file); unsigned performed_len = vec_safe_length (e->caller->clone.performed_splits); if (performed_len > 0) fprintf (symtab->dump_file, "Performed splits records:\n"); for (unsigned i = 0; i < performed_len; i++) { ipa_param_performed_split *sm = &(*e->caller->clone.performed_splits)[i]; print_node_brief (symtab->dump_file, " dummy_decl: ", sm->dummy_decl, TDF_UID); fprintf (symtab->dump_file, ", unit_offset: %u\n", sm->unit_offset); } } if (ipa_param_adjustments *padjs = e->callee->clone.param_adjustments) { /* We need to defer cleaning EH info on the new statement to fixup-cfg. We may not have dominator information at this point and thus would end up with unreachable blocks and have no way to communicate that we need to run CFG cleanup then. */ int lp_nr = lookup_stmt_eh_lp (e->call_stmt); if (lp_nr != 0) remove_stmt_from_eh_lp (e->call_stmt); tree old_fntype = gimple_call_fntype (e->call_stmt); new_stmt = padjs->modify_call (e->call_stmt, e->caller->clone.performed_splits, e->callee->decl, false); cgraph_node *origin = e->callee; while (origin->clone_of) origin = origin->clone_of; if ((origin->former_clone_of && old_fntype == TREE_TYPE (origin->former_clone_of)) || old_fntype == TREE_TYPE (origin->decl)) gimple_call_set_fntype (new_stmt, TREE_TYPE (e->callee->decl)); else { tree new_fntype = padjs->build_new_function_type (old_fntype, true); gimple_call_set_fntype (new_stmt, new_fntype); } if (lp_nr != 0) add_stmt_to_eh_lp (new_stmt, lp_nr); } else { new_stmt = e->call_stmt; gimple_call_set_fndecl (new_stmt, e->callee->decl); update_stmt_fn (DECL_STRUCT_FUNCTION (e->caller->decl), new_stmt); } /* If changing the call to __cxa_pure_virtual or similar noreturn function, adjust gimple_call_fntype too. */ if (gimple_call_noreturn_p (new_stmt) && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (e->callee->decl))) && TYPE_ARG_TYPES (TREE_TYPE (e->callee->decl)) && (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (e->callee->decl))) == void_type_node)) gimple_call_set_fntype (new_stmt, TREE_TYPE (e->callee->decl)); /* If the call becomes noreturn, remove the LHS if possible. */ tree lhs = gimple_call_lhs (new_stmt); if (lhs && gimple_call_noreturn_p (new_stmt) && (VOID_TYPE_P (TREE_TYPE (gimple_call_fntype (new_stmt))) || should_remove_lhs_p (lhs))) { if (TREE_CODE (lhs) == SSA_NAME) { tree var = create_tmp_reg_fn (DECL_STRUCT_FUNCTION (e->caller->decl), TREE_TYPE (lhs), NULL); var = get_or_create_ssa_default_def (DECL_STRUCT_FUNCTION (e->caller->decl), var); gimple *set_stmt = gimple_build_assign (lhs, var); gsi = gsi_for_stmt (new_stmt); gsi_insert_before_without_update (&gsi, set_stmt, GSI_SAME_STMT); update_stmt_fn (DECL_STRUCT_FUNCTION (e->caller->decl), set_stmt); } gimple_call_set_lhs (new_stmt, NULL_TREE); update_stmt_fn (DECL_STRUCT_FUNCTION (e->caller->decl), new_stmt); } /* If new callee has no static chain, remove it. */ if (gimple_call_chain (new_stmt) && !DECL_STATIC_CHAIN (e->callee->decl)) { gimple_call_set_chain (new_stmt, NULL); update_stmt_fn (DECL_STRUCT_FUNCTION (e->caller->decl), new_stmt); } maybe_remove_unused_call_args (DECL_STRUCT_FUNCTION (e->caller->decl), new_stmt); e->caller->set_call_stmt_including_clones (e->call_stmt, new_stmt, false); if (symtab->dump_file) { fprintf (symtab->dump_file, " updated to:"); print_gimple_stmt (symtab->dump_file, e->call_stmt, 0, dump_flags); } return new_stmt; } /* Update or remove the corresponding cgraph edge if a GIMPLE_CALL OLD_STMT changed into NEW_STMT. OLD_CALL is gimple_call_fndecl of OLD_STMT if it was previously call statement. If NEW_STMT is NULL, the call has been dropped without any replacement. */ static void cgraph_update_edges_for_call_stmt_node (cgraph_node *node, gimple *old_stmt, tree old_call, gimple *new_stmt) { tree new_call = (new_stmt && is_gimple_call (new_stmt)) ? gimple_call_fndecl (new_stmt) : 0; /* We are seeing indirect calls, then there is nothing to update. */ if (!new_call && !old_call) return; /* See if we turned indirect call into direct call or folded call to one builtin into different builtin. */ if (old_call != new_call) { cgraph_edge *e = node->get_edge (old_stmt); cgraph_edge *ne = NULL; profile_count count; if (e) { /* Keep calls marked as dead dead. */ if (new_stmt && is_gimple_call (new_stmt) && e->callee && fndecl_built_in_p (e->callee->decl, BUILT_IN_UNREACHABLE)) { cgraph_edge::set_call_stmt (node->get_edge (old_stmt), as_a (new_stmt)); return; } /* See if the edge is already there and has the correct callee. It might be so because of indirect inlining has already updated it. We also might've cloned and redirected the edge. */ if (new_call && e->callee) { cgraph_node *callee = e->callee; while (callee) { if (callee->decl == new_call || callee->former_clone_of == new_call) { cgraph_edge::set_call_stmt (e, as_a (new_stmt)); return; } callee = callee->clone_of; } } /* Otherwise remove edge and create new one; we can't simply redirect since function has changed, so inline plan and other information attached to edge is invalid. */ count = e->count; if (e->indirect_unknown_callee || e->inline_failed) cgraph_edge::remove (e); else e->callee->remove_symbol_and_inline_clones (); } else if (new_call) { /* We are seeing new direct call; compute profile info based on BB. */ basic_block bb = gimple_bb (new_stmt); count = bb->count; } if (new_call) { ne = node->create_edge (cgraph_node::get_create (new_call), as_a (new_stmt), count); gcc_assert (ne->inline_failed); } } /* We only updated the call stmt; update pointer in cgraph edge.. */ else if (old_stmt != new_stmt) cgraph_edge::set_call_stmt (node->get_edge (old_stmt), as_a (new_stmt)); } /* Update or remove the corresponding cgraph edge if a GIMPLE_CALL OLD_STMT changed into NEW_STMT. OLD_DECL is gimple_call_fndecl of OLD_STMT before it was updated (updating can happen inplace). */ void cgraph_update_edges_for_call_stmt (gimple *old_stmt, tree old_decl, gimple *new_stmt) { cgraph_node *orig = cgraph_node::get (cfun->decl); cgraph_node *node; gcc_checking_assert (orig); cgraph_update_edges_for_call_stmt_node (orig, old_stmt, old_decl, new_stmt); if (orig->clones) for (node = orig->clones; node != orig;) { cgraph_update_edges_for_call_stmt_node (node, old_stmt, old_decl, new_stmt); if (node->clones) node = node->clones; else if (node->next_sibling_clone) node = node->next_sibling_clone; else { while (node != orig && !node->next_sibling_clone) node = node->clone_of; if (node != orig) node = node->next_sibling_clone; } } } /* Remove all callees from the node. */ void cgraph_node::remove_callees (void) { cgraph_edge *e, *f; calls_comdat_local = false; /* It is sufficient to remove the edges from the lists of callers of the callees. The callee list of the node can be zapped with one assignment. */ for (e = callees; e; e = f) { f = e->next_callee; symtab->call_edge_removal_hooks (e); if (!e->indirect_unknown_callee) e->remove_callee (); symtab->free_edge (e); } for (e = indirect_calls; e; e = f) { f = e->next_callee; symtab->call_edge_removal_hooks (e); if (!e->indirect_unknown_callee) e->remove_callee (); symtab->free_edge (e); } indirect_calls = NULL; callees = NULL; if (call_site_hash) { call_site_hash->empty (); call_site_hash = NULL; } } /* Remove all callers from the node. */ void cgraph_node::remove_callers (void) { cgraph_edge *e, *f; /* It is sufficient to remove the edges from the lists of callees of the callers. The caller list of the node can be zapped with one assignment. */ for (e = callers; e; e = f) { f = e->next_caller; symtab->call_edge_removal_hooks (e); e->remove_caller (); symtab->free_edge (e); } callers = NULL; } /* Helper function for cgraph_release_function_body and free_lang_data. It releases body from function DECL without having to inspect its possibly non-existent symtab node. */ void release_function_body (tree decl) { function *fn = DECL_STRUCT_FUNCTION (decl); if (fn) { if (fn->cfg && loops_for_fn (fn)) { fn->curr_properties &= ~PROP_loops; loop_optimizer_finalize (fn); } if (fn->gimple_df) { delete_tree_ssa (fn); fn->eh = NULL; } if (fn->cfg) { gcc_assert (!dom_info_available_p (fn, CDI_DOMINATORS)); gcc_assert (!dom_info_available_p (fn, CDI_POST_DOMINATORS)); delete_tree_cfg_annotations (fn); clear_edges (fn); fn->cfg = NULL; } if (fn->value_histograms) free_histograms (fn); gimple_set_body (decl, NULL); /* Struct function hangs a lot of data that would leak if we didn't removed all pointers to it. */ ggc_free (fn); DECL_STRUCT_FUNCTION (decl) = NULL; } DECL_SAVED_TREE (decl) = NULL; } /* Release memory used to represent body of function. Use this only for functions that are released before being translated to target code (i.e. RTL). Functions that are compiled to RTL and beyond are free'd in final.c via free_after_compilation(). KEEP_ARGUMENTS are useful only if you want to rebuild body as thunk. */ void cgraph_node::release_body (bool keep_arguments) { ipa_transforms_to_apply.release (); if (!used_as_abstract_origin && symtab->state != PARSING) { DECL_RESULT (decl) = NULL; if (!keep_arguments) DECL_ARGUMENTS (decl) = NULL; } /* If the node is abstract and needed, then do not clear DECL_INITIAL of its associated function declaration because it's needed to emit debug info later. */ if (!used_as_abstract_origin && DECL_INITIAL (decl)) DECL_INITIAL (decl) = error_mark_node; release_function_body (decl); if (lto_file_data) { lto_free_function_in_decl_state_for_node (this); lto_file_data = NULL; } } /* Remove function from symbol table. */ void cgraph_node::remove (void) { if (symtab->ipa_clones_dump_file && symtab->cloned_nodes.contains (this)) fprintf (symtab->ipa_clones_dump_file, "Callgraph removal;%s;%d;%s;%d;%d\n", asm_name (), order, DECL_SOURCE_FILE (decl), DECL_SOURCE_LINE (decl), DECL_SOURCE_COLUMN (decl)); symtab->call_cgraph_removal_hooks (this); remove_callers (); remove_callees (); ipa_transforms_to_apply.release (); delete_function_version (function_version ()); /* Incremental inlining access removed nodes stored in the postorder list. */ force_output = false; forced_by_abi = false; cgraph_node *next; for (cgraph_node *n = nested; n; n = next) { next = n->next_nested; n->origin = NULL; n->next_nested = NULL; } nested = NULL; if (origin) { cgraph_node **node2 = &origin->nested; while (*node2 != this) node2 = &(*node2)->next_nested; *node2 = next_nested; } unregister (); if (prev_sibling_clone) prev_sibling_clone->next_sibling_clone = next_sibling_clone; else if (clone_of) clone_of->clones = next_sibling_clone; if (next_sibling_clone) next_sibling_clone->prev_sibling_clone = prev_sibling_clone; if (clones) { cgraph_node *n, *next; if (clone_of) { for (n = clones; n->next_sibling_clone; n = n->next_sibling_clone) n->clone_of = clone_of; n->clone_of = clone_of; n->next_sibling_clone = clone_of->clones; if (clone_of->clones) clone_of->clones->prev_sibling_clone = n; clone_of->clones = clones; } else { /* We are removing node with clones. This makes clones inconsistent, but assume they will be removed subsequently and just keep clone tree intact. This can happen in unreachable function removal since we remove unreachable functions in random order, not by bottom-up walk of clone trees. */ for (n = clones; n; n = next) { next = n->next_sibling_clone; n->next_sibling_clone = NULL; n->prev_sibling_clone = NULL; n->clone_of = NULL; } } } /* While all the clones are removed after being proceeded, the function itself is kept in the cgraph even after it is compiled. Check whether we are done with this body and reclaim it proactively if this is the case. */ if (symtab->state != LTO_STREAMING) { cgraph_node *n = cgraph_node::get (decl); if (!n || (!n->clones && !n->clone_of && !n->inlined_to && ((symtab->global_info_ready || in_lto_p) && (TREE_ASM_WRITTEN (n->decl) || DECL_EXTERNAL (n->decl) || !n->analyzed || (!flag_wpa && n->in_other_partition))))) release_body (); } else { lto_free_function_in_decl_state_for_node (this); lto_file_data = NULL; } decl = NULL; if (call_site_hash) { call_site_hash->empty (); call_site_hash = NULL; } symtab->release_symbol (this); } /* Likewise indicate that a node is having address taken. */ void cgraph_node::mark_address_taken (void) { /* Indirect inlining can figure out that all uses of the address are inlined. */ if (inlined_to) { gcc_assert (cfun->after_inlining); gcc_assert (callers->indirect_inlining_edge); return; } /* FIXME: address_taken flag is used both as a shortcut for testing whether IPA_REF_ADDR reference exists (and thus it should be set on node representing alias we take address of) and as a test whether address of the object was taken (and thus it should be set on node alias is referring to). We should remove the first use and the remove the following set. */ address_taken = 1; cgraph_node *node = ultimate_alias_target (); node->address_taken = 1; } /* Return local info node for the compiled function. */ cgraph_node * cgraph_node::local_info_node (tree decl) { gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); cgraph_node *node = get (decl); if (!node) return NULL; return node->ultimate_alias_target (); } /* Return RTL info for the compiled function. */ cgraph_rtl_info * cgraph_node::rtl_info (const_tree decl) { gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); cgraph_node *node = get (decl); if (!node) return NULL; enum availability avail; node = node->ultimate_alias_target (&avail); if (decl != current_function_decl && (avail < AVAIL_AVAILABLE || (node->decl != current_function_decl && !TREE_ASM_WRITTEN (node->decl)))) return NULL; /* Allocate if it doesn't exist. */ if (node->rtl == NULL) { node->rtl = ggc_cleared_alloc (); SET_HARD_REG_SET (node->rtl->function_used_regs); } return node->rtl; } /* Return a string describing the failure REASON. */ const char* cgraph_inline_failed_string (cgraph_inline_failed_t reason) { #undef DEFCIFCODE #define DEFCIFCODE(code, type, string) string, static const char *cif_string_table[CIF_N_REASONS] = { #include "cif-code.def" }; /* Signedness of an enum type is implementation defined, so cast it to unsigned before testing. */ gcc_assert ((unsigned) reason < CIF_N_REASONS); return cif_string_table[reason]; } /* Return a type describing the failure REASON. */ cgraph_inline_failed_type_t cgraph_inline_failed_type (cgraph_inline_failed_t reason) { #undef DEFCIFCODE #define DEFCIFCODE(code, type, string) type, static cgraph_inline_failed_type_t cif_type_table[CIF_N_REASONS] = { #include "cif-code.def" }; /* Signedness of an enum type is implementation defined, so cast it to unsigned before testing. */ gcc_assert ((unsigned) reason < CIF_N_REASONS); return cif_type_table[reason]; } /* Names used to print out the availability enum. */ const char * const cgraph_availability_names[] = {"unset", "not_available", "overwritable", "available", "local"}; /* Output flags of edge to a file F. */ void cgraph_edge::dump_edge_flags (FILE *f) { if (speculative) fprintf (f, "(speculative) "); if (!inline_failed) fprintf (f, "(inlined) "); if (call_stmt_cannot_inline_p) fprintf (f, "(call_stmt_cannot_inline_p) "); if (indirect_inlining_edge) fprintf (f, "(indirect_inlining) "); if (count.initialized_p ()) { fprintf (f, "("); count.dump (f); fprintf (f, ","); fprintf (f, "%.2f per call) ", sreal_frequency ().to_double ()); } if (can_throw_external) fprintf (f, "(can throw external) "); } /* Dump call graph node to file F. */ void cgraph_node::dump (FILE *f) { cgraph_edge *edge; dump_base (f); if (inlined_to) fprintf (f, " Function %s is inline copy in %s\n", dump_name (), inlined_to->dump_name ()); if (clone_of) fprintf (f, " Clone of %s\n", clone_of->dump_asm_name ()); if (symtab->function_flags_ready) fprintf (f, " Availability: %s\n", cgraph_availability_names [get_availability ()]); if (profile_id) fprintf (f, " Profile id: %i\n", profile_id); if (unit_id) fprintf (f, " Unit id: %i\n", unit_id); cgraph_function_version_info *vi = function_version (); if (vi != NULL) { fprintf (f, " Version info: "); if (vi->prev != NULL) { fprintf (f, "prev: "); fprintf (f, "%s ", vi->prev->this_node->dump_asm_name ()); } if (vi->next != NULL) { fprintf (f, "next: "); fprintf (f, "%s ", vi->next->this_node->dump_asm_name ()); } if (vi->dispatcher_resolver != NULL_TREE) fprintf (f, "dispatcher: %s", lang_hooks.decl_printable_name (vi->dispatcher_resolver, 2)); fprintf (f, "\n"); } fprintf (f, " Function flags:"); if (count.initialized_p ()) { fprintf (f, " count:"); count.dump (f); } if (tp_first_run > 0) fprintf (f, " first_run:%" PRId64, (int64_t) tp_first_run); if (origin) fprintf (f, " nested in:%s", origin->dump_asm_name ()); if (gimple_has_body_p (decl)) fprintf (f, " body"); if (process) fprintf (f, " process"); if (local) fprintf (f, " local"); if (redefined_extern_inline) fprintf (f, " redefined_extern_inline"); if (only_called_at_startup) fprintf (f, " only_called_at_startup"); if (only_called_at_exit) fprintf (f, " only_called_at_exit"); if (tm_clone) fprintf (f, " tm_clone"); if (calls_comdat_local) fprintf (f, " calls_comdat_local"); if (icf_merged) fprintf (f, " icf_merged"); if (merged_comdat) fprintf (f, " merged_comdat"); if (merged_extern_inline) fprintf (f, " merged_extern_inline"); if (split_part) fprintf (f, " split_part"); if (indirect_call_target) fprintf (f, " indirect_call_target"); if (nonfreeing_fn) fprintf (f, " nonfreeing_fn"); if (DECL_STATIC_CONSTRUCTOR (decl)) fprintf (f," static_constructor (priority:%i)", get_init_priority ()); if (DECL_STATIC_DESTRUCTOR (decl)) fprintf (f," static_destructor (priority:%i)", get_fini_priority ()); if (frequency == NODE_FREQUENCY_HOT) fprintf (f, " hot"); if (frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED) fprintf (f, " unlikely_executed"); if (frequency == NODE_FREQUENCY_EXECUTED_ONCE) fprintf (f, " executed_once"); if (opt_for_fn (decl, optimize_size)) fprintf (f, " optimize_size"); if (parallelized_function) fprintf (f, " parallelized_function"); if (DECL_IS_OPERATOR_NEW_P (decl)) fprintf (f, " %soperator_new", DECL_IS_REPLACEABLE_OPERATOR (decl) ? "replaceable_" : ""); if (DECL_IS_OPERATOR_DELETE_P (decl)) fprintf (f, " %soperator_delete", DECL_IS_REPLACEABLE_OPERATOR (decl) ? "replaceable_" : ""); fprintf (f, "\n"); if (thunk.thunk_p) { fprintf (f, " Thunk"); if (thunk.alias) fprintf (f, " of %s (asm:%s)", lang_hooks.decl_printable_name (thunk.alias, 2), IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk.alias))); fprintf (f, " fixed offset %i virtual value %i indirect_offset %i " "has virtual offset %i\n", (int)thunk.fixed_offset, (int)thunk.virtual_value, (int)thunk.indirect_offset, (int)thunk.virtual_offset_p); } else if (former_thunk_p ()) fprintf (f, " Former thunk fixed offset %i virtual value %i " "indirect_offset %i has virtual offset %i\n", (int)thunk.fixed_offset, (int)thunk.virtual_value, (int)thunk.indirect_offset, (int)thunk.virtual_offset_p); if (alias && thunk.alias && DECL_P (thunk.alias)) { fprintf (f, " Alias of %s", lang_hooks.decl_printable_name (thunk.alias, 2)); if (DECL_ASSEMBLER_NAME_SET_P (thunk.alias)) fprintf (f, " (asm:%s)", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (thunk.alias))); fprintf (f, "\n"); } fprintf (f, " Called by: "); profile_count sum = profile_count::zero (); for (edge = callers; edge; edge = edge->next_caller) { fprintf (f, "%s ", edge->caller->dump_asm_name ()); edge->dump_edge_flags (f); if (edge->count.initialized_p ()) sum += edge->count.ipa (); } fprintf (f, "\n Calls: "); for (edge = callees; edge; edge = edge->next_callee) { fprintf (f, "%s ", edge->callee->dump_asm_name ()); edge->dump_edge_flags (f); } fprintf (f, "\n"); if (count.ipa ().initialized_p ()) { bool ok = true; bool min = false; ipa_ref *ref; FOR_EACH_ALIAS (this, ref) if (dyn_cast (ref->referring)->count.initialized_p ()) sum += dyn_cast (ref->referring)->count.ipa (); if (inlined_to || (symtab->state < EXPANSION && ultimate_alias_target () == this && only_called_directly_p ())) ok = !count.ipa ().differs_from_p (sum); else if (count.ipa () > profile_count::from_gcov_type (100) && count.ipa () < sum.apply_scale (99, 100)) ok = false, min = true; if (!ok) { fprintf (f, " Invalid sum of caller counts "); sum.dump (f); if (min) fprintf (f, ", should be at most "); else fprintf (f, ", should be "); count.ipa ().dump (f); fprintf (f, "\n"); } } for (edge = indirect_calls; edge; edge = edge->next_callee) { if (edge->indirect_info->polymorphic) { fprintf (f, " Polymorphic indirect call of type "); print_generic_expr (f, edge->indirect_info->otr_type, TDF_SLIM); fprintf (f, " token:%i", (int) edge->indirect_info->otr_token); } else fprintf (f, " Indirect call"); edge->dump_edge_flags (f); if (edge->indirect_info->param_index != -1) { fprintf (f, " of param:%i", edge->indirect_info->param_index); if (edge->indirect_info->agg_contents) fprintf (f, " loaded from %s %s at offset %i", edge->indirect_info->member_ptr ? "member ptr" : "aggregate", edge->indirect_info->by_ref ? "passed by reference":"", (int)edge->indirect_info->offset); if (edge->indirect_info->vptr_changed) fprintf (f, " (vptr maybe changed)"); } fprintf (f, " Num speculative call targets: %i", edge->indirect_info->num_speculative_call_targets); fprintf (f, "\n"); if (edge->indirect_info->polymorphic) edge->indirect_info->context.dump (f); } } /* Dump call graph node to file F in graphviz format. */ void cgraph_node::dump_graphviz (FILE *f) { cgraph_edge *edge; for (edge = callees; edge; edge = edge->next_callee) { cgraph_node *callee = edge->callee; fprintf (f, "\t\"%s\" -> \"%s\"\n", dump_name (), callee->dump_name ()); } } /* Dump call graph node NODE to stderr. */ DEBUG_FUNCTION void cgraph_node::debug (void) { dump (stderr); } /* Dump the callgraph to file F. */ void cgraph_node::dump_cgraph (FILE *f) { cgraph_node *node; fprintf (f, "callgraph:\n\n"); FOR_EACH_FUNCTION (node) node->dump (f); } /* Return true when the DECL can possibly be inlined. */ bool cgraph_function_possibly_inlined_p (tree decl) { if (!symtab->global_info_ready) return !DECL_UNINLINABLE (decl); return DECL_POSSIBLY_INLINED (decl); } /* cgraph_node is no longer nested function; update cgraph accordingly. */ void cgraph_node::unnest (void) { cgraph_node **node2 = &origin->nested; gcc_assert (origin); while (*node2 != this) node2 = &(*node2)->next_nested; *node2 = next_nested; origin = NULL; } /* Return function availability. See cgraph.h for description of individual return values. */ enum availability cgraph_node::get_availability (symtab_node *ref) { if (ref) { cgraph_node *cref = dyn_cast (ref); if (cref) ref = cref->inlined_to; } enum availability avail; if (!analyzed) avail = AVAIL_NOT_AVAILABLE; else if (local) avail = AVAIL_LOCAL; else if (inlined_to) avail = AVAIL_AVAILABLE; else if (transparent_alias) ultimate_alias_target (&avail, ref); else if (ifunc_resolver || lookup_attribute ("noipa", DECL_ATTRIBUTES (decl))) avail = AVAIL_INTERPOSABLE; else if (!externally_visible) avail = AVAIL_AVAILABLE; /* If this is a reference from symbol itself and there are no aliases, we may be sure that the symbol was not interposed by something else because the symbol itself would be unreachable otherwise. Also comdat groups are always resolved in groups. */ else if ((this == ref && !has_aliases_p ()) || (ref && get_comdat_group () && get_comdat_group () == ref->get_comdat_group ())) avail = AVAIL_AVAILABLE; /* Inline functions are safe to be analyzed even if their symbol can be overwritten at runtime. It is not meaningful to enforce any sane behavior on replacing inline function by different body. */ else if (DECL_DECLARED_INLINE_P (decl)) avail = AVAIL_AVAILABLE; /* If the function can be overwritten, return OVERWRITABLE. Take care at least of two notable extensions - the COMDAT functions used to share template instantiations in C++ (this is symmetric to code cp_cannot_inline_tree_fn and probably shall be shared and the inlinability hooks completely eliminated). */ else if (decl_replaceable_p (decl) && !DECL_EXTERNAL (decl)) avail = AVAIL_INTERPOSABLE; else avail = AVAIL_AVAILABLE; return avail; } /* Worker for cgraph_node_can_be_local_p. */ static bool cgraph_node_cannot_be_local_p_1 (cgraph_node *node, void *) { return !(!node->force_output && !node->ifunc_resolver /* Limitation of gas requires us to output targets of symver aliases as global symbols. This is binutils PR 25295. */ && !node->symver && ((DECL_COMDAT (node->decl) && !node->forced_by_abi && !node->used_from_object_file_p () && !node->same_comdat_group) || !node->externally_visible)); } /* Return true if cgraph_node can be made local for API change. Extern inline functions and C++ COMDAT functions can be made local at the expense of possible code size growth if function is used in multiple compilation units. */ bool cgraph_node::can_be_local_p (void) { return (!address_taken && !call_for_symbol_thunks_and_aliases (cgraph_node_cannot_be_local_p_1, NULL, true)); } /* Call callback on cgraph_node, thunks and aliases associated to cgraph_node. When INCLUDE_OVERWRITABLE is false, overwritable symbols are skipped. When EXCLUDE_VIRTUAL_THUNKS is true, virtual thunks are skipped. */ bool cgraph_node::call_for_symbol_thunks_and_aliases (bool (*callback) (cgraph_node *, void *), void *data, bool include_overwritable, bool exclude_virtual_thunks) { cgraph_edge *e; ipa_ref *ref; enum availability avail = AVAIL_AVAILABLE; if (include_overwritable || (avail = get_availability ()) > AVAIL_INTERPOSABLE) { if (callback (this, data)) return true; } FOR_EACH_ALIAS (this, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (include_overwritable || alias->get_availability () > AVAIL_INTERPOSABLE) if (alias->call_for_symbol_thunks_and_aliases (callback, data, include_overwritable, exclude_virtual_thunks)) return true; } if (avail <= AVAIL_INTERPOSABLE) return false; for (e = callers; e; e = e->next_caller) if (e->caller->thunk.thunk_p && (include_overwritable || e->caller->get_availability () > AVAIL_INTERPOSABLE) && !(exclude_virtual_thunks && e->caller->thunk.virtual_offset_p)) if (e->caller->call_for_symbol_thunks_and_aliases (callback, data, include_overwritable, exclude_virtual_thunks)) return true; return false; } /* Worker to bring NODE local. */ bool cgraph_node::make_local (cgraph_node *node, void *) { gcc_checking_assert (node->can_be_local_p ()); if (DECL_COMDAT (node->decl) || DECL_EXTERNAL (node->decl)) { node->make_decl_local (); node->set_section (NULL); node->set_comdat_group (NULL); node->externally_visible = false; node->forced_by_abi = false; node->local = true; node->set_section (NULL); node->unique_name = ((node->resolution == LDPR_PREVAILING_DEF_IRONLY || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP) && !flag_incremental_link); node->resolution = LDPR_PREVAILING_DEF_IRONLY; gcc_assert (node->get_availability () == AVAIL_LOCAL); } return false; } /* Bring cgraph node local. */ void cgraph_node::make_local (void) { call_for_symbol_thunks_and_aliases (cgraph_node::make_local, NULL, true); } /* Worker to set nothrow flag. */ static void set_nothrow_flag_1 (cgraph_node *node, bool nothrow, bool non_call, bool *changed) { cgraph_edge *e; if (nothrow && !TREE_NOTHROW (node->decl)) { /* With non-call exceptions we can't say for sure if other function body was not possibly optimized to still throw. */ if (!non_call || node->binds_to_current_def_p ()) { TREE_NOTHROW (node->decl) = true; *changed = true; for (e = node->callers; e; e = e->next_caller) e->can_throw_external = false; } } else if (!nothrow && TREE_NOTHROW (node->decl)) { TREE_NOTHROW (node->decl) = false; *changed = true; } ipa_ref *ref; FOR_EACH_ALIAS (node, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (!nothrow || alias->get_availability () > AVAIL_INTERPOSABLE) set_nothrow_flag_1 (alias, nothrow, non_call, changed); } for (cgraph_edge *e = node->callers; e; e = e->next_caller) if (e->caller->thunk.thunk_p && (!nothrow || e->caller->get_availability () > AVAIL_INTERPOSABLE)) set_nothrow_flag_1 (e->caller, nothrow, non_call, changed); } /* Set TREE_NOTHROW on NODE's decl and on aliases of NODE if any to NOTHROW. */ bool cgraph_node::set_nothrow_flag (bool nothrow) { bool changed = false; bool non_call = opt_for_fn (decl, flag_non_call_exceptions); if (!nothrow || get_availability () > AVAIL_INTERPOSABLE) set_nothrow_flag_1 (this, nothrow, non_call, &changed); else { ipa_ref *ref; FOR_EACH_ALIAS (this, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (!nothrow || alias->get_availability () > AVAIL_INTERPOSABLE) set_nothrow_flag_1 (alias, nothrow, non_call, &changed); } } return changed; } /* Worker to set malloc flag. */ static void set_malloc_flag_1 (cgraph_node *node, bool malloc_p, bool *changed) { if (malloc_p && !DECL_IS_MALLOC (node->decl)) { DECL_IS_MALLOC (node->decl) = true; *changed = true; } ipa_ref *ref; FOR_EACH_ALIAS (node, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (!malloc_p || alias->get_availability () > AVAIL_INTERPOSABLE) set_malloc_flag_1 (alias, malloc_p, changed); } for (cgraph_edge *e = node->callers; e; e = e->next_caller) if (e->caller->thunk.thunk_p && (!malloc_p || e->caller->get_availability () > AVAIL_INTERPOSABLE)) set_malloc_flag_1 (e->caller, malloc_p, changed); } /* Set DECL_IS_MALLOC on NODE's decl and on NODE's aliases if any. */ bool cgraph_node::set_malloc_flag (bool malloc_p) { bool changed = false; if (!malloc_p || get_availability () > AVAIL_INTERPOSABLE) set_malloc_flag_1 (this, malloc_p, &changed); else { ipa_ref *ref; FOR_EACH_ALIAS (this, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (!malloc_p || alias->get_availability () > AVAIL_INTERPOSABLE) set_malloc_flag_1 (alias, malloc_p, &changed); } } return changed; } /* Worker to set_const_flag. */ static void set_const_flag_1 (cgraph_node *node, bool set_const, bool looping, bool *changed) { /* Static constructors and destructors without a side effect can be optimized out. */ if (set_const && !looping) { if (DECL_STATIC_CONSTRUCTOR (node->decl)) { DECL_STATIC_CONSTRUCTOR (node->decl) = 0; *changed = true; } if (DECL_STATIC_DESTRUCTOR (node->decl)) { DECL_STATIC_DESTRUCTOR (node->decl) = 0; *changed = true; } } if (!set_const) { if (TREE_READONLY (node->decl)) { TREE_READONLY (node->decl) = 0; DECL_LOOPING_CONST_OR_PURE_P (node->decl) = false; *changed = true; } } else { /* Consider function: bool a(int *p) { return *p==*p; } During early optimization we will turn this into: bool a(int *p) { return true; } Now if this function will be detected as CONST however when interposed it may end up being just pure. We always must assume the worst scenario here. */ if (TREE_READONLY (node->decl)) { if (!looping && DECL_LOOPING_CONST_OR_PURE_P (node->decl)) { DECL_LOOPING_CONST_OR_PURE_P (node->decl) = false; *changed = true; } } else if (node->binds_to_current_def_p ()) { TREE_READONLY (node->decl) = true; DECL_LOOPING_CONST_OR_PURE_P (node->decl) = looping; DECL_PURE_P (node->decl) = false; *changed = true; } else { if (dump_file && (dump_flags & TDF_DETAILS)) fprintf (dump_file, "Dropping state to PURE because function does " "not bind to current def.\n"); if (!DECL_PURE_P (node->decl)) { DECL_PURE_P (node->decl) = true; DECL_LOOPING_CONST_OR_PURE_P (node->decl) = looping; *changed = true; } else if (!looping && DECL_LOOPING_CONST_OR_PURE_P (node->decl)) { DECL_LOOPING_CONST_OR_PURE_P (node->decl) = false; *changed = true; } } } ipa_ref *ref; FOR_EACH_ALIAS (node, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (!set_const || alias->get_availability () > AVAIL_INTERPOSABLE) set_const_flag_1 (alias, set_const, looping, changed); } for (cgraph_edge *e = node->callers; e; e = e->next_caller) if (e->caller->thunk.thunk_p && (!set_const || e->caller->get_availability () > AVAIL_INTERPOSABLE)) { /* Virtual thunks access virtual offset in the vtable, so they can only be pure, never const. */ if (set_const && (e->caller->thunk.virtual_offset_p || !node->binds_to_current_def_p (e->caller))) *changed |= e->caller->set_pure_flag (true, looping); else set_const_flag_1 (e->caller, set_const, looping, changed); } } /* If SET_CONST is true, mark function, aliases and thunks to be ECF_CONST. If SET_CONST if false, clear the flag. When setting the flag be careful about possible interposition and do not set the flag for functions that can be interposed and set pure flag for functions that can bind to other definition. Return true if any change was done. */ bool cgraph_node::set_const_flag (bool set_const, bool looping) { bool changed = false; if (!set_const || get_availability () > AVAIL_INTERPOSABLE) set_const_flag_1 (this, set_const, looping, &changed); else { ipa_ref *ref; FOR_EACH_ALIAS (this, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (!set_const || alias->get_availability () > AVAIL_INTERPOSABLE) set_const_flag_1 (alias, set_const, looping, &changed); } } return changed; } /* Info used by set_pure_flag_1. */ struct set_pure_flag_info { bool pure; bool looping; bool changed; }; /* Worker to set_pure_flag. */ static bool set_pure_flag_1 (cgraph_node *node, void *data) { struct set_pure_flag_info *info = (struct set_pure_flag_info *)data; /* Static constructors and destructors without a side effect can be optimized out. */ if (info->pure && !info->looping) { if (DECL_STATIC_CONSTRUCTOR (node->decl)) { DECL_STATIC_CONSTRUCTOR (node->decl) = 0; info->changed = true; } if (DECL_STATIC_DESTRUCTOR (node->decl)) { DECL_STATIC_DESTRUCTOR (node->decl) = 0; info->changed = true; } } if (info->pure) { if (!DECL_PURE_P (node->decl) && !TREE_READONLY (node->decl)) { DECL_PURE_P (node->decl) = true; DECL_LOOPING_CONST_OR_PURE_P (node->decl) = info->looping; info->changed = true; } else if (DECL_LOOPING_CONST_OR_PURE_P (node->decl) && !info->looping) { DECL_LOOPING_CONST_OR_PURE_P (node->decl) = false; info->changed = true; } } else { if (DECL_PURE_P (node->decl)) { DECL_PURE_P (node->decl) = false; DECL_LOOPING_CONST_OR_PURE_P (node->decl) = false; info->changed = true; } } return false; } /* Set DECL_PURE_P on cgraph_node's decl and on aliases of the node if any to PURE. When setting the flag, be careful about possible interposition. Return true if any change was done. */ bool cgraph_node::set_pure_flag (bool pure, bool looping) { struct set_pure_flag_info info = {pure, looping, false}; call_for_symbol_thunks_and_aliases (set_pure_flag_1, &info, !pure, true); return info.changed; } /* Return true when cgraph_node cannot return or throw and thus it is safe to ignore its side effects for IPA analysis. */ bool cgraph_node::cannot_return_p (void) { int flags = flags_from_decl_or_type (decl); if (!opt_for_fn (decl, flag_exceptions)) return (flags & ECF_NORETURN) != 0; else return ((flags & (ECF_NORETURN | ECF_NOTHROW)) == (ECF_NORETURN | ECF_NOTHROW)); } /* Return true when call of edge cannot lead to return from caller and thus it is safe to ignore its side effects for IPA analysis when computing side effects of the caller. FIXME: We could actually mark all edges that have no reaching patch to the exit block or throw to get better results. */ bool cgraph_edge::cannot_lead_to_return_p (void) { if (caller->cannot_return_p ()) return true; if (indirect_unknown_callee) { int flags = indirect_info->ecf_flags; if (!opt_for_fn (caller->decl, flag_exceptions)) return (flags & ECF_NORETURN) != 0; else return ((flags & (ECF_NORETURN | ECF_NOTHROW)) == (ECF_NORETURN | ECF_NOTHROW)); } else return callee->cannot_return_p (); } /* Return true if the edge may be considered hot. */ bool cgraph_edge::maybe_hot_p (void) { if (!maybe_hot_count_p (NULL, count.ipa ())) return false; if (caller->frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED || (callee && callee->frequency == NODE_FREQUENCY_UNLIKELY_EXECUTED)) return false; if (caller->frequency > NODE_FREQUENCY_UNLIKELY_EXECUTED && (callee && callee->frequency <= NODE_FREQUENCY_EXECUTED_ONCE)) return false; if (opt_for_fn (caller->decl, optimize_size)) return false; if (caller->frequency == NODE_FREQUENCY_HOT) return true; if (!count.initialized_p ()) return true; cgraph_node *where = caller->inlined_to ? caller->inlined_to : caller; if (!where->count.initialized_p ()) return false; if (caller->frequency == NODE_FREQUENCY_EXECUTED_ONCE) { if (count.apply_scale (2, 1) < where->count.apply_scale (3, 1)) return false; } else if (count.apply_scale (param_hot_bb_frequency_fraction , 1) < where->count) return false; return true; } /* Worker for cgraph_can_remove_if_no_direct_calls_p. */ static bool nonremovable_p (cgraph_node *node, void *) { return !node->can_remove_if_no_direct_calls_and_refs_p (); } /* Return true if whole comdat group can be removed if there are no direct calls to THIS. */ bool cgraph_node::can_remove_if_no_direct_calls_p (bool will_inline) { struct ipa_ref *ref; /* For local symbols or non-comdat group it is the same as can_remove_if_no_direct_calls_p. */ if (!externally_visible || !same_comdat_group) { if (DECL_EXTERNAL (decl)) return true; if (address_taken) return false; return !call_for_symbol_and_aliases (nonremovable_p, NULL, true); } if (will_inline && address_taken) return false; /* Otherwise check if we can remove the symbol itself and then verify that only uses of the comdat groups are direct call to THIS or its aliases. */ if (!can_remove_if_no_direct_calls_and_refs_p ()) return false; /* Check that all refs come from within the comdat group. */ for (int i = 0; iterate_referring (i, ref); i++) if (ref->referring->get_comdat_group () != get_comdat_group ()) return false; struct cgraph_node *target = ultimate_alias_target (); for (cgraph_node *next = dyn_cast (same_comdat_group); next != this; next = dyn_cast (next->same_comdat_group)) { if (!externally_visible) continue; if (!next->alias && !next->can_remove_if_no_direct_calls_and_refs_p ()) return false; /* If we see different symbol than THIS, be sure to check calls. */ if (next->ultimate_alias_target () != target) for (cgraph_edge *e = next->callers; e; e = e->next_caller) if (e->caller->get_comdat_group () != get_comdat_group () || will_inline) return false; /* If function is not being inlined, we care only about references outside of the comdat group. */ if (!will_inline) for (int i = 0; next->iterate_referring (i, ref); i++) if (ref->referring->get_comdat_group () != get_comdat_group ()) return false; } return true; } /* Return true when function cgraph_node can be expected to be removed from program when direct calls in this compilation unit are removed. As a special case COMDAT functions are cgraph_can_remove_if_no_direct_calls_p while the are not cgraph_only_called_directly_p (it is possible they are called from other unit) This function behaves as cgraph_only_called_directly_p because eliminating all uses of COMDAT function does not make it necessarily disappear from the program unless we are compiling whole program or we do LTO. In this case we know we win since dynamic linking will not really discard the linkonce section. */ bool cgraph_node::will_be_removed_from_program_if_no_direct_calls_p (bool will_inline) { gcc_assert (!inlined_to); if (DECL_EXTERNAL (decl)) return true; if (!in_lto_p && !flag_whole_program) { /* If the symbol is in comdat group, we need to verify that whole comdat group becomes unreachable. Technically we could skip references from within the group, too. */ if (!only_called_directly_p ()) return false; if (same_comdat_group && externally_visible) { struct cgraph_node *target = ultimate_alias_target (); if (will_inline && address_taken) return true; for (cgraph_node *next = dyn_cast (same_comdat_group); next != this; next = dyn_cast (next->same_comdat_group)) { if (!externally_visible) continue; if (!next->alias && !next->only_called_directly_p ()) return false; /* If we see different symbol than THIS, be sure to check calls. */ if (next->ultimate_alias_target () != target) for (cgraph_edge *e = next->callers; e; e = e->next_caller) if (e->caller->get_comdat_group () != get_comdat_group () || will_inline) return false; } } return true; } else return can_remove_if_no_direct_calls_p (will_inline); } /* Worker for cgraph_only_called_directly_p. */ static bool cgraph_not_only_called_directly_p_1 (cgraph_node *node, void *) { return !node->only_called_directly_or_aliased_p (); } /* Return true when function cgraph_node and all its aliases are only called directly. i.e. it is not externally visible, address was not taken and it is not used in any other non-standard way. */ bool cgraph_node::only_called_directly_p (void) { gcc_assert (ultimate_alias_target () == this); return !call_for_symbol_and_aliases (cgraph_not_only_called_directly_p_1, NULL, true); } /* Collect all callers of NODE. Worker for collect_callers_of_node. */ static bool collect_callers_of_node_1 (cgraph_node *node, void *data) { vec *redirect_callers = (vec *)data; cgraph_edge *cs; enum availability avail; node->ultimate_alias_target (&avail); if (avail > AVAIL_INTERPOSABLE) for (cs = node->callers; cs != NULL; cs = cs->next_caller) if (!cs->indirect_inlining_edge && !cs->caller->thunk.thunk_p) redirect_callers->safe_push (cs); return false; } /* Collect all callers of cgraph_node and its aliases that are known to lead to cgraph_node (i.e. are not overwritable). */ vec cgraph_node::collect_callers (void) { vec redirect_callers = vNULL; call_for_symbol_thunks_and_aliases (collect_callers_of_node_1, &redirect_callers, false); return redirect_callers; } /* Return TRUE if NODE2 a clone of NODE or is equivalent to it. Return optimistically true if this cannot be determined. */ static bool clone_of_p (cgraph_node *node, cgraph_node *node2) { node = node->ultimate_alias_target (); node2 = node2->ultimate_alias_target (); if (node2->clone_of == node || node2->former_clone_of == node->decl) return true; if (!node->thunk.thunk_p && !node->former_thunk_p ()) { while (node2 && node->decl != node2->decl) node2 = node2->clone_of; return node2 != NULL; } /* There are no virtual clones of thunks so check former_clone_of or if we might have skipped thunks because this adjustments are no longer necessary. */ while (node->thunk.thunk_p || node->former_thunk_p ()) { if (!node->thunk.this_adjusting) return false; /* In case of instrumented expanded thunks, which can have multiple calls in them, we do not know how to continue and just have to be optimistic. The same applies if all calls have already been inlined into the thunk. */ if (!node->callees || node->callees->next_callee) return true; node = node->callees->callee->ultimate_alias_target (); if (!node2->clone.param_adjustments || node2->clone.param_adjustments->first_param_intact_p ()) return false; if (node2->former_clone_of == node->decl || node2->former_clone_of == node->former_clone_of) return true; cgraph_node *n2 = node2; while (n2 && node->decl != n2->decl) n2 = n2->clone_of; if (n2) return true; } return false; } /* Verify edge count and frequency. */ bool cgraph_edge::verify_count () { bool error_found = false; if (!count.verify ()) { error ("caller edge count invalid"); error_found = true; } return error_found; } /* Switch to THIS_CFUN if needed and print STMT to stderr. */ static void cgraph_debug_gimple_stmt (function *this_cfun, gimple *stmt) { bool fndecl_was_null = false; /* debug_gimple_stmt needs correct cfun */ if (cfun != this_cfun) set_cfun (this_cfun); /* ...and an actual current_function_decl */ if (!current_function_decl) { current_function_decl = this_cfun->decl; fndecl_was_null = true; } debug_gimple_stmt (stmt); if (fndecl_was_null) current_function_decl = NULL; } /* Verify that call graph edge corresponds to DECL from the associated statement. Return true if the verification should fail. */ bool cgraph_edge::verify_corresponds_to_fndecl (tree decl) { cgraph_node *node; if (!decl || callee->inlined_to) return false; if (symtab->state == LTO_STREAMING) return false; node = cgraph_node::get (decl); /* We do not know if a node from a different partition is an alias or what it aliases and therefore cannot do the former_clone_of check reliably. When body_removed is set, we have lost all information about what was alias or thunk of and also cannot proceed. */ if (!node || node->body_removed || node->in_other_partition || callee->icf_merged || callee->in_other_partition) return false; node = node->ultimate_alias_target (); /* Optimizers can redirect unreachable calls or calls triggering undefined behavior to builtin_unreachable. */ if (fndecl_built_in_p (callee->decl, BUILT_IN_UNREACHABLE)) return false; if (callee->former_clone_of != node->decl && (node != callee->ultimate_alias_target ()) && !clone_of_p (node, callee)) return true; else return false; } /* Disable warnings about missing quoting in GCC diagnostics for the verification errors. Their format strings don't follow GCC diagnostic conventions and the calls are ultimately followed by one to internal_error. */ #if __GNUC__ >= 10 # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wformat-diag" #endif /* Verify consistency of speculative call in NODE corresponding to STMT and LTO_STMT_UID. If INDIRECT is set, assume that it is the indirect edge of call sequence. Return true if error is found. This function is called to every component of indirect call (direct edges, indirect edge and refs). To save duplicated work, do full testing only in that case. */ static bool verify_speculative_call (struct cgraph_node *node, gimple *stmt, unsigned int lto_stmt_uid, struct cgraph_edge *indirect) { if (indirect == NULL) { for (indirect = node->indirect_calls; indirect; indirect = indirect->next_callee) if (indirect->call_stmt == stmt && indirect->lto_stmt_uid == lto_stmt_uid) break; if (!indirect) { error ("missing indirect call in speculative call sequence"); return true; } if (!indirect->speculative) { error ("indirect call in speculative call sequence has no " "speculative flag"); return true; } return false; } /* Maximal number of targets. We probably will never want to have more than this. */ const unsigned int num = 256; cgraph_edge *direct_calls[num]; ipa_ref *refs[num]; for (unsigned int i = 0; i < num; i++) { direct_calls[i] = NULL; refs[i] = NULL; } cgraph_edge *first_call = NULL; cgraph_edge *prev_call = NULL; for (cgraph_edge *direct = node->callees; direct; direct = direct->next_callee) if (direct->call_stmt == stmt && direct->lto_stmt_uid == lto_stmt_uid) { if (!first_call) first_call = direct; if (prev_call && direct != prev_call->next_callee) { error ("speculative edges are not adjacent"); return true; } prev_call = direct; if (!direct->speculative) { error ("direct call to %s in speculative call sequence has no " "speculative flag", direct->callee->dump_name ()); return true; } if (direct->speculative_id >= num) { error ("direct call to %s in speculative call sequence has " "speculative_id %i out of range", direct->callee->dump_name (), direct->speculative_id); return true; } if (direct_calls[direct->speculative_id]) { error ("duplicate direct call to %s in speculative call sequence " "with speculative_id %i", direct->callee->dump_name (), direct->speculative_id); return true; } direct_calls[direct->speculative_id] = direct; } if (first_call->call_stmt && first_call != node->get_edge (first_call->call_stmt)) { error ("call stmt hash does not point to first direct edge of " "speculative call sequence"); return true; } ipa_ref *ref; for (int i = 0; node->iterate_reference (i, ref); i++) if (ref->speculative && ref->stmt == stmt && ref->lto_stmt_uid == lto_stmt_uid) { if (ref->speculative_id >= num) { error ("direct call to %s in speculative call sequence has " "speculative_id %i out of range", ref->referred->dump_name (), ref->speculative_id); return true; } if (refs[ref->speculative_id]) { error ("duplicate reference %s in speculative call sequence " "with speculative_id %i", ref->referred->dump_name (), ref->speculative_id); return true; } refs[ref->speculative_id] = ref; } int num_targets = 0; for (unsigned int i = 0 ; i < num ; i++) { if (refs[i] && !direct_calls[i]) { error ("missing direct call for speculation %i", i); return true; } if (!refs[i] && direct_calls[i]) { error ("missing ref for speculation %i", i); return true; } if (refs[i] != NULL) num_targets++; } if (num_targets != indirect->num_speculative_call_targets_p ()) { error ("number of speculative targets %i mismatched with " "num_speculative_call_targets %i", num_targets, indirect->num_speculative_call_targets_p ()); return true; } return false; } /* Verify cgraph nodes of given cgraph node. */ DEBUG_FUNCTION void cgraph_node::verify_node (void) { cgraph_edge *e; function *this_cfun = DECL_STRUCT_FUNCTION (decl); basic_block this_block; gimple_stmt_iterator gsi; bool error_found = false; int i; ipa_ref *ref = NULL; if (seen_error ()) return; timevar_push (TV_CGRAPH_VERIFY); error_found |= verify_base (); for (e = callees; e; e = e->next_callee) if (e->aux) { error ("aux field set for edge %s->%s", identifier_to_locale (e->caller->name ()), identifier_to_locale (e->callee->name ())); error_found = true; } if (!count.verify ()) { error ("cgraph count invalid"); error_found = true; } if (inlined_to && same_comdat_group) { error ("inline clone in same comdat group list"); error_found = true; } if (inlined_to && !count.compatible_p (inlined_to->count)) { error ("inline clone count is not compatible"); count.debug (); inlined_to->count.debug (); error_found = true; } if (tp_first_run < 0) { error ("tp_first_run must be non-negative"); error_found = true; } if (!definition && !in_other_partition && local) { error ("local symbols must be defined"); error_found = true; } if (inlined_to && externally_visible) { error ("externally visible inline clone"); error_found = true; } if (inlined_to && address_taken) { error ("inline clone with address taken"); error_found = true; } if (inlined_to && force_output) { error ("inline clone is forced to output"); error_found = true; } if (symtab->state != LTO_STREAMING) { if (calls_comdat_local && !same_comdat_group) { error ("calls_comdat_local is set outside of a comdat group"); error_found = true; } if (!inlined_to && calls_comdat_local != check_calls_comdat_local_p ()) { error ("invalid calls_comdat_local flag"); error_found = true; } } if (DECL_IS_MALLOC (decl) && !POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))) { error ("malloc attribute should be used for a function that " "returns a pointer"); error_found = true; } for (e = indirect_calls; e; e = e->next_callee) { if (e->aux) { error ("aux field set for indirect edge from %s", identifier_to_locale (e->caller->name ())); error_found = true; } if (!e->count.compatible_p (count)) { error ("edge count is not compatible with function count"); e->count.debug (); count.debug (); error_found = true; } if (!e->indirect_unknown_callee || !e->indirect_info) { error ("An indirect edge from %s is not marked as indirect or has " "associated indirect_info, the corresponding statement is: ", identifier_to_locale (e->caller->name ())); cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); error_found = true; } if (e->call_stmt && e->lto_stmt_uid) { error ("edge has both call_stmt and lto_stmt_uid set"); error_found = true; } } bool check_comdat = comdat_local_p (); for (e = callers; e; e = e->next_caller) { if (e->verify_count ()) error_found = true; if (check_comdat && !in_same_comdat_group_p (e->caller)) { error ("comdat-local function called by %s outside its comdat", identifier_to_locale (e->caller->name ())); error_found = true; } if (!e->inline_failed) { if (inlined_to != (e->caller->inlined_to ? e->caller->inlined_to : e->caller)) { error ("inlined_to pointer is wrong"); error_found = true; } if (callers->next_caller) { error ("multiple inline callers"); error_found = true; } } else if (inlined_to) { error ("inlined_to pointer set for noninline callers"); error_found = true; } } for (e = callees; e; e = e->next_callee) { if (e->verify_count ()) error_found = true; if (!e->count.compatible_p (count)) { error ("edge count is not compatible with function count"); e->count.debug (); count.debug (); error_found = true; } if (gimple_has_body_p (e->caller->decl) && !e->caller->inlined_to && !e->speculative /* Optimized out calls are redirected to __builtin_unreachable. */ && (e->count.nonzero_p () || ! e->callee->decl || !fndecl_built_in_p (e->callee->decl, BUILT_IN_UNREACHABLE)) && count == ENTRY_BLOCK_PTR_FOR_FN (DECL_STRUCT_FUNCTION (decl))->count && (!e->count.ipa_p () && e->count.differs_from_p (gimple_bb (e->call_stmt)->count))) { error ("caller edge count does not match BB count"); fprintf (stderr, "edge count: "); e->count.dump (stderr); fprintf (stderr, "\n bb count: "); gimple_bb (e->call_stmt)->count.dump (stderr); fprintf (stderr, "\n"); error_found = true; } if (e->call_stmt && e->lto_stmt_uid) { error ("edge has both call_stmt and lto_stmt_uid set"); error_found = true; } if (e->speculative && verify_speculative_call (e->caller, e->call_stmt, e->lto_stmt_uid, NULL)) error_found = true; } for (e = indirect_calls; e; e = e->next_callee) { if (e->verify_count ()) error_found = true; if (gimple_has_body_p (e->caller->decl) && !e->caller->inlined_to && !e->speculative && e->count.ipa_p () && count == ENTRY_BLOCK_PTR_FOR_FN (DECL_STRUCT_FUNCTION (decl))->count && (!e->count.ipa_p () && e->count.differs_from_p (gimple_bb (e->call_stmt)->count))) { error ("indirect call count does not match BB count"); fprintf (stderr, "edge count: "); e->count.dump (stderr); fprintf (stderr, "\n bb count: "); gimple_bb (e->call_stmt)->count.dump (stderr); fprintf (stderr, "\n"); error_found = true; } if (e->speculative && verify_speculative_call (e->caller, e->call_stmt, e->lto_stmt_uid, e)) error_found = true; } for (i = 0; iterate_reference (i, ref); i++) { if (ref->stmt && ref->lto_stmt_uid) { error ("reference has both stmt and lto_stmt_uid set"); error_found = true; } if (ref->speculative && verify_speculative_call (this, ref->stmt, ref->lto_stmt_uid, NULL)) error_found = true; } if (!callers && inlined_to) { error ("inlined_to pointer is set but no predecessors found"); error_found = true; } if (inlined_to == this) { error ("inlined_to pointer refers to itself"); error_found = true; } if (clone_of) { cgraph_node *first_clone = clone_of->clones; if (first_clone != this) { if (prev_sibling_clone->clone_of != clone_of) { error ("cgraph_node has wrong clone_of"); error_found = true; } } } if (clones) { cgraph_node *n; for (n = clones; n; n = n->next_sibling_clone) if (n->clone_of != this) break; if (n) { error ("cgraph_node has wrong clone list"); error_found = true; } } if ((prev_sibling_clone || next_sibling_clone) && !clone_of) { error ("cgraph_node is in clone list but it is not clone"); error_found = true; } if (!prev_sibling_clone && clone_of && clone_of->clones != this) { error ("cgraph_node has wrong prev_clone pointer"); error_found = true; } if (prev_sibling_clone && prev_sibling_clone->next_sibling_clone != this) { error ("double linked list of clones corrupted"); error_found = true; } if (analyzed && alias) { bool ref_found = false; int i; ipa_ref *ref = NULL; if (callees) { error ("Alias has call edges"); error_found = true; } for (i = 0; iterate_reference (i, ref); i++) if (ref->use != IPA_REF_ALIAS) { error ("Alias has non-alias reference"); error_found = true; } else if (ref_found) { error ("Alias has more than one alias reference"); error_found = true; } else ref_found = true; if (!ref_found) { error ("Analyzed alias has no reference"); error_found = true; } } if (analyzed && thunk.thunk_p) { if (!callees) { error ("No edge out of thunk node"); error_found = true; } else if (callees->next_callee) { error ("More than one edge out of thunk node"); error_found = true; } if (gimple_has_body_p (decl) && !inlined_to) { error ("Thunk is not supposed to have body"); error_found = true; } } else if (analyzed && gimple_has_body_p (decl) && !TREE_ASM_WRITTEN (decl) && (!DECL_EXTERNAL (decl) || inlined_to) && !flag_wpa) { if (this_cfun->cfg) { hash_set stmts; /* Reach the trees by walking over the CFG, and note the enclosing basic-blocks in the call edges. */ FOR_EACH_BB_FN (this_block, this_cfun) { for (gsi = gsi_start_phis (this_block); !gsi_end_p (gsi); gsi_next (&gsi)) stmts.add (gsi_stmt (gsi)); for (gsi = gsi_start_bb (this_block); !gsi_end_p (gsi); gsi_next (&gsi)) { gimple *stmt = gsi_stmt (gsi); stmts.add (stmt); if (is_gimple_call (stmt)) { cgraph_edge *e = get_edge (stmt); tree decl = gimple_call_fndecl (stmt); if (e) { if (e->aux) { error ("shared call_stmt:"); cgraph_debug_gimple_stmt (this_cfun, stmt); error_found = true; } if (!e->indirect_unknown_callee) { if (e->verify_corresponds_to_fndecl (decl)) { error ("edge points to wrong declaration:"); debug_tree (e->callee->decl); fprintf (stderr," Instead of:"); debug_tree (decl); error_found = true; } } else if (decl) { error ("an indirect edge with unknown callee " "corresponding to a call_stmt with " "a known declaration:"); error_found = true; cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); } e->aux = (void *)1; } else if (decl) { error ("missing callgraph edge for call stmt:"); cgraph_debug_gimple_stmt (this_cfun, stmt); error_found = true; } } } } for (i = 0; iterate_reference (i, ref); i++) if (ref->stmt && !stmts.contains (ref->stmt)) { error ("reference to dead statement"); cgraph_debug_gimple_stmt (this_cfun, ref->stmt); error_found = true; } } else /* No CFG available?! */ gcc_unreachable (); for (e = callees; e; e = e->next_callee) { if (!e->aux && !e->speculative) { error ("edge %s->%s has no corresponding call_stmt", identifier_to_locale (e->caller->name ()), identifier_to_locale (e->callee->name ())); cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); error_found = true; } e->aux = 0; } for (e = indirect_calls; e; e = e->next_callee) { if (!e->aux && !e->speculative) { error ("an indirect edge from %s has no corresponding call_stmt", identifier_to_locale (e->caller->name ())); cgraph_debug_gimple_stmt (this_cfun, e->call_stmt); error_found = true; } e->aux = 0; } } if (nested != NULL) { for (cgraph_node *n = nested; n != NULL; n = n->next_nested) { if (n->origin == NULL) { error ("missing origin for a node in a nested list"); error_found = true; } else if (n->origin != this) { error ("origin points to a different parent"); error_found = true; break; } } } if (next_nested != NULL && origin == NULL) { error ("missing origin for a node in a nested list"); error_found = true; } if (error_found) { dump (stderr); internal_error ("verify_cgraph_node failed"); } timevar_pop (TV_CGRAPH_VERIFY); } /* Verify whole cgraph structure. */ DEBUG_FUNCTION void cgraph_node::verify_cgraph_nodes (void) { cgraph_node *node; if (seen_error ()) return; FOR_EACH_FUNCTION (node) node->verify (); } #if __GNUC__ >= 10 # pragma GCC diagnostic pop #endif /* Walk the alias chain to return the function cgraph_node is alias of. Walk through thunks, too. When AVAILABILITY is non-NULL, get minimal availability in the chain. When REF is non-NULL, assume that reference happens in symbol REF when determining the availability. */ cgraph_node * cgraph_node::function_symbol (enum availability *availability, struct symtab_node *ref) { cgraph_node *node = ultimate_alias_target (availability, ref); while (node->thunk.thunk_p) { enum availability a; ref = node; node = node->callees->callee; node = node->ultimate_alias_target (availability ? &a : NULL, ref); if (availability && a < *availability) *availability = a; } return node; } /* Walk the alias chain to return the function cgraph_node is alias of. Walk through non virtual thunks, too. Thus we return either a function or a virtual thunk node. When AVAILABILITY is non-NULL, get minimal availability in the chain. When REF is non-NULL, assume that reference happens in symbol REF when determining the availability. */ cgraph_node * cgraph_node::function_or_virtual_thunk_symbol (enum availability *availability, struct symtab_node *ref) { cgraph_node *node = ultimate_alias_target (availability, ref); while (node->thunk.thunk_p && !node->thunk.virtual_offset_p) { enum availability a; ref = node; node = node->callees->callee; node = node->ultimate_alias_target (availability ? &a : NULL, ref); if (availability && a < *availability) *availability = a; } return node; } /* When doing LTO, read cgraph_node's body from disk if it is not already present. */ bool cgraph_node::get_untransformed_body (void) { lto_file_decl_data *file_data; const char *data, *name; size_t len; tree decl = this->decl; /* Check if body is already there. Either we have gimple body or the function is thunk and in that case we set DECL_ARGUMENTS. */ if (DECL_ARGUMENTS (decl) || gimple_has_body_p (decl)) return false; gcc_assert (in_lto_p && !DECL_RESULT (decl)); timevar_push (TV_IPA_LTO_GIMPLE_IN); file_data = lto_file_data; name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); /* We may have renamed the declaration, e.g., a static function. */ name = lto_get_decl_name_mapping (file_data, name); struct lto_in_decl_state *decl_state = lto_get_function_in_decl_state (file_data, decl); cgraph_node *origin = this; while (origin->clone_of) origin = origin->clone_of; int stream_order = origin->order - file_data->order_base; data = lto_get_section_data (file_data, LTO_section_function_body, name, stream_order, &len, decl_state->compressed); if (!data) fatal_error (input_location, "%s: section %s.%d is missing", file_data->file_name, name, stream_order); gcc_assert (DECL_STRUCT_FUNCTION (decl) == NULL); if (!quiet_flag) fprintf (stderr, " in:%s", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); lto_input_function_body (file_data, this, data); lto_stats.num_function_bodies++; lto_free_section_data (file_data, LTO_section_function_body, name, data, len, decl_state->compressed); lto_free_function_in_decl_state_for_node (this); /* Keep lto file data so ipa-inline-analysis knows about cross module inlining. */ timevar_pop (TV_IPA_LTO_GIMPLE_IN); return true; } /* Prepare function body. When doing LTO, read cgraph_node's body from disk if it is not already present. When some IPA transformations are scheduled, apply them. */ bool cgraph_node::get_body (void) { bool updated; updated = get_untransformed_body (); /* Getting transformed body makes no sense for inline clones; we should never use this on real clones because they are materialized early. TODO: Materializing clones here will likely lead to smaller LTRANS footprint. */ gcc_assert (!inlined_to && !clone_of); if (ipa_transforms_to_apply.exists ()) { opt_pass *saved_current_pass = current_pass; FILE *saved_dump_file = dump_file; const char *saved_dump_file_name = dump_file_name; dump_flags_t saved_dump_flags = dump_flags; dump_file_name = NULL; set_dump_file (NULL); push_cfun (DECL_STRUCT_FUNCTION (decl)); update_ssa (TODO_update_ssa_only_virtuals); execute_all_ipa_transforms (true); cgraph_edge::rebuild_edges (); free_dominance_info (CDI_DOMINATORS); free_dominance_info (CDI_POST_DOMINATORS); pop_cfun (); updated = true; current_pass = saved_current_pass; set_dump_file (saved_dump_file); dump_file_name = saved_dump_file_name; dump_flags = saved_dump_flags; } return updated; } /* Return the DECL_STRUCT_FUNCTION of the function. */ struct function * cgraph_node::get_fun () const { const cgraph_node *node = this; struct function *fun = DECL_STRUCT_FUNCTION (node->decl); while (!fun && node->clone_of) { node = node->clone_of; fun = DECL_STRUCT_FUNCTION (node->decl); } return fun; } /* Reset all state within cgraph.c so that we can rerun the compiler within the same process. For use by toplev::finalize. */ void cgraph_c_finalize (void) { symtab = NULL; x_cgraph_nodes_queue = NULL; cgraph_fnver_htab = NULL; version_info_node = NULL; } /* A worker for call_for_symbol_and_aliases. */ bool cgraph_node::call_for_symbol_and_aliases_1 (bool (*callback) (cgraph_node *, void *), void *data, bool include_overwritable) { ipa_ref *ref; FOR_EACH_ALIAS (this, ref) { cgraph_node *alias = dyn_cast (ref->referring); if (include_overwritable || alias->get_availability () > AVAIL_INTERPOSABLE) if (alias->call_for_symbol_and_aliases (callback, data, include_overwritable)) return true; } return false; } /* Return true if NODE has thunk. */ bool cgraph_node::has_thunk_p (cgraph_node *node, void *) { for (cgraph_edge *e = node->callers; e; e = e->next_caller) if (e->caller->thunk.thunk_p) return true; return false; } /* Expected frequency of executions within the function. */ sreal cgraph_edge::sreal_frequency () { return count.to_sreal_scale (caller->inlined_to ? caller->inlined_to->count : caller->count); } /* During LTO stream in this can be used to check whether call can possibly be internal to the current translation unit. */ bool cgraph_edge::possibly_call_in_translation_unit_p (void) { gcc_checking_assert (in_lto_p && caller->prevailing_p ()); /* While incremental linking we may end up getting function body later. */ if (flag_incremental_link == INCREMENTAL_LINK_LTO) return true; /* We may be smarter here and avoid streaming in indirect calls we can't track, but that would require arranging streaming the indirect call summary first. */ if (!callee) return true; /* If callee is local to the original translation unit, it will be defined. */ if (!TREE_PUBLIC (callee->decl) && !DECL_EXTERNAL (callee->decl)) return true; /* Otherwise we need to lookup prevailing symbol (symbol table is not merged, yet) and see if it is a definition. In fact we may also resolve aliases, but that is probably not too important. */ symtab_node *node = callee; for (int n = 10; node->previous_sharing_asm_name && n ; n--) node = node->previous_sharing_asm_name; if (node->previous_sharing_asm_name) node = symtab_node::get_for_asmname (DECL_ASSEMBLER_NAME (callee->decl)); gcc_assert (TREE_PUBLIC (node->decl)); return node->get_availability () >= AVAIL_INTERPOSABLE; } /* Return num_speculative_targets of this edge. */ int cgraph_edge::num_speculative_call_targets_p (void) { return indirect_info ? indirect_info->num_speculative_call_targets : 0; } /* Check if function calls comdat local. This is used to recompute calls_comdat_local flag after function transformations. */ bool cgraph_node::check_calls_comdat_local_p () { for (cgraph_edge *e = callees; e; e = e->next_callee) if (e->inline_failed ? e->callee->comdat_local_p () : e->callee->check_calls_comdat_local_p ()) return true; return false; } /* A stashed copy of "symtab" for use by selftest::symbol_table_test. This needs to be a global so that it can be a GC root, and thus prevent the stashed copy from being garbage-collected if the GC runs during a symbol_table_test. */ symbol_table *saved_symtab; #if CHECKING_P namespace selftest { /* class selftest::symbol_table_test. */ /* Constructor. Store the old value of symtab, and create a new one. */ symbol_table_test::symbol_table_test () { gcc_assert (saved_symtab == NULL); saved_symtab = symtab; symtab = new (ggc_alloc ()) symbol_table (); } /* Destructor. Restore the old value of symtab. */ symbol_table_test::~symbol_table_test () { gcc_assert (saved_symtab != NULL); symtab = saved_symtab; saved_symtab = NULL; } /* Verify that symbol_table_test works. */ static void test_symbol_table_test () { /* Simulate running two selftests involving symbol tables. */ for (int i = 0; i < 2; i++) { symbol_table_test stt; tree test_decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL, get_identifier ("test_decl"), build_function_type_list (void_type_node, NULL_TREE)); cgraph_node *node = cgraph_node::get_create (test_decl); gcc_assert (node); /* Verify that the node has order 0 on both iterations, and thus that nodes have predictable dump names in selftests. */ ASSERT_EQ (node->order, 0); ASSERT_STREQ (node->dump_name (), "test_decl/0"); } } /* Run all of the selftests within this file. */ void cgraph_c_tests () { test_symbol_table_test (); } } // namespace selftest #endif /* CHECKING_P */ #include "gt-cgraph.h"