blob: de0786537814690bf7e841500be532e96f62132a [file] [log] [blame]
/* Callgraph handling code.
Copyright (C) 2003-2021 Free Software Foundation, Inc.
Contributed by Jan Hubicka
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* 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"
#include "tree-nested.h"
#include "symtab-thunks.h"
#include "symtab-clones.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<cgraph_function_version_info>
{
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<function_version_hasher> *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 <cgraph_node *> (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 <varpool_node *> (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<cgraph_function_version_info> ();
version_info_node->this_node = this;
if (cgraph_fnver_htab == NULL)
cgraph_fnver_htab = hash_table<function_version_hasher>::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_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 ();
maybe_record_nested_function (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 = true;
node->definition = true;
thunk_info *i;
thunk_info local_info;
if (symtab->state < CONSTRUCTION)
i = &local_info;
else
i = thunk_info::get_create (node);
i->fixed_offset = fixed_offset;
i->virtual_value = virtual_value;
i->indirect_offset = indirect_offset;
i->alias = real_alias;
i->this_adjusting = this_adjusting;
i->virtual_offset_p = virtual_offset != NULL;
if (symtab->state < CONSTRUCTION)
i->register_early (node);
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 <cgraph_node *> (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<cgraph_edge_hasher>::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<cgraph_edge> ();
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;
if (callee)
caller->calls_declare_variant_alt |= callee->declare_variant_alt;
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<cgraph_indirect_call_info> ();
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<cgraph_node *> (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)
{
if (cgraph_node *node = cgraph_node::get (decl))
{
clone_info *info = clone_info::get (node);
gcc_assert (!info || !info->param_adjustments);
}
}
clone_info *callee_info = clone_info::get (e->callee);
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 (callee_info && callee_info->param_adjustments)
callee_info->param_adjustments->dump (symtab->dump_file);
}
if (ipa_param_adjustments *padjs
= callee_info ? callee_info->param_adjustments : NULL)
{
/* 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, 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
{
if (flag_checking
&& !fndecl_built_in_p (e->callee->decl, BUILT_IN_UNREACHABLE))
ipa_verify_edge_has_no_modifications (e);
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 <gcall *> (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 <gcall *> (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 <gcall *> (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 <gcall *> (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);
free_cfg (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;
}
if (flag_checking && clones)
{
/* It is invalid to release body before materializing clones except
for thunks that don't really need a body. Verify also that we do
not leak pointers to the call statements. */
for (cgraph_node *node = clones; node;
node = node->next_sibling_clone)
gcc_assert (node->thunk && !node->callees->call_stmt);
}
remove_callees ();
remove_all_references ();
}
/* Remove function from symbol table. */
void
cgraph_node::remove (void)
{
bool clone_info_set = false;
clone_info *info, saved_info;
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));
if ((info = clone_info::get (this)) != NULL)
{
saved_info = *info;
clone_info_set = true;
}
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;
unregister (clone_info_set ? &saved_info : NULL);
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<cgraph_rtl_info> ();
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 edge to stderr. */
void
cgraph_edge::debug (void)
{
fprintf (stderr, "%s -> %s ", caller->dump_asm_name (),
callee == NULL ? "(null)" : callee->dump_asm_name ());
dump_edge_flags (stderr);
fprintf (stderr, "\n\n");
caller->debug ();
if (callee != NULL)
callee->debug ();
}
/* 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 (cgraph_node *origin = nested_function_origin (this))
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_MALLOC (decl))
fprintf (f, " decl_is_malloc");
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)
{
fprintf (f, " Thunk");
thunk_info::get (this)->dump (f);
}
else if (former_thunk_p ())
{
fprintf (f, " Former thunk ");
thunk_info::get (this)->dump (f);
}
else gcc_checking_assert (!thunk_info::get (this));
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 (!body_removed && count.ipa ().initialized_p ())
{
bool ok = true;
bool min = false;
ipa_ref *ref;
FOR_EACH_ALIAS (this, ref)
if (dyn_cast <cgraph_node *> (ref->referring)->count.initialized_p ())
sum += dyn_cast <cgraph_node *> (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\n",
edge->indirect_info->num_speculative_call_targets);
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);
}
/* 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 <cgraph_node *> (ref);
if (cref)
ref = cref->inlined_to;
}
enum availability avail;
if (!analyzed && !in_other_partition)
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 <cgraph_node *> (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
&& (include_overwritable
|| e->caller->get_availability () > AVAIL_INTERPOSABLE)
&& !(exclude_virtual_thunks
&& thunk_info::get (e->caller)->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 <cgraph_node *> (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
&& (!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 <cgraph_node *> (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<cgraph_node *> (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
&& (!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<cgraph_node *> (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 <cgraph_node *> (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
&& (!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
&& (thunk_info::get (e->caller)->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 <cgraph_node *> (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));