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/* Callgraph clones
Copyright (C) 2003-2018 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 module provide facilities for clonning functions. I.e. creating
new functions based on existing functions with simple modifications,
such as replacement of parameters.
To allow whole program optimization without actual presence of function
bodies, an additional infrastructure is provided for so-called virtual
clones
A virtual clone in the callgraph is a function that has no
associated body, just a description of how to create its body based
on a different function (which itself may be a virtual clone).
The description of function modifications includes adjustments to
the function's signature (which allows, for example, removing or
adding function arguments), substitutions to perform on the
function body, and, for inlined functions, a pointer to the
function that it will be inlined into.
It is also possible to redirect any edge of the callgraph from a
function to its virtual clone. This implies updating of the call
site to adjust for the new function signature.
Most of the transformations performed by inter-procedural
optimizations can be represented via virtual clones. For
instance, a constant propagation pass can produce a virtual clone
of the function which replaces one of its arguments by a
constant. The inliner can represent its decisions by producing a
clone of a function whose body will be later integrated into
a given function.
Using virtual clones, the program can be easily updated
during the Execute stage, solving most of pass interactions
problems that would otherwise occur during Transform.
Virtual clones are later materialized in the LTRANS stage and
turned into real functions. Passes executed after the virtual
clone were introduced also perform their Transform stage
on new functions, so for a pass there is no significant
difference between operating on a real function or a virtual
clone introduced before its Execute stage.
Optimization passes then work on virtual clones introduced before
their Execute stage as if they were real functions. The
only difference is that clones are not visible during the
Generate Summary stage. */
#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 "stringpool.h"
#include "cgraph.h"
#include "lto-streamer.h"
#include "tree-eh.h"
#include "tree-cfg.h"
#include "tree-inline.h"
#include "dumpfile.h"
#include "gimple-pretty-print.h"
/* Create clone of edge in the node N represented by CALL_EXPR
the callgraph. */
cgraph_edge *
cgraph_edge::clone (cgraph_node *n, gcall *call_stmt, unsigned stmt_uid,
profile_count num, profile_count den,
bool update_original)
{
cgraph_edge *new_edge;
profile_count::adjust_for_ipa_scaling (&num, &den);
profile_count prof_count = count.apply_scale (num, den);
if (indirect_unknown_callee)
{
tree decl;
if (call_stmt && (decl = gimple_call_fndecl (call_stmt))
/* When the call is speculative, we need to resolve it
via cgraph_resolve_speculation and not here. */
&& !speculative)
{
cgraph_node *callee = cgraph_node::get (decl);
gcc_checking_assert (callee);
new_edge = n->create_edge (callee, call_stmt, prof_count);
}
else
{
new_edge = n->create_indirect_edge (call_stmt,
indirect_info->ecf_flags,
prof_count, false);
*new_edge->indirect_info = *indirect_info;
}
}
else
{
new_edge = n->create_edge (callee, call_stmt, prof_count);
if (indirect_info)
{
new_edge->indirect_info
= ggc_cleared_alloc<cgraph_indirect_call_info> ();
*new_edge->indirect_info = *indirect_info;
}
}
new_edge->inline_failed = inline_failed;
new_edge->indirect_inlining_edge = indirect_inlining_edge;
new_edge->lto_stmt_uid = stmt_uid;
/* Clone flags that depend on call_stmt availability manually. */
new_edge->can_throw_external = can_throw_external;
new_edge->call_stmt_cannot_inline_p = call_stmt_cannot_inline_p;
new_edge->speculative = speculative;
new_edge->in_polymorphic_cdtor = in_polymorphic_cdtor;
/* Update IPA profile. Local profiles need no updating in original. */
if (update_original)
count = count.combine_with_ipa_count (count.ipa ()
- new_edge->count.ipa ());
symtab->call_edge_duplication_hooks (this, new_edge);
return new_edge;
}
/* Build variant of function type ORIG_TYPE skipping ARGS_TO_SKIP and the
return value if SKIP_RETURN is true. */
tree
cgraph_build_function_type_skip_args (tree orig_type, bitmap args_to_skip,
bool skip_return)
{
tree new_type = NULL;
tree args, new_args = NULL;
tree new_reversed;
int i = 0;
for (args = TYPE_ARG_TYPES (orig_type); args && args != void_list_node;
args = TREE_CHAIN (args), i++)
if (!args_to_skip || !bitmap_bit_p (args_to_skip, i))
new_args = tree_cons (NULL_TREE, TREE_VALUE (args), new_args);
new_reversed = nreverse (new_args);
if (args)
{
if (new_reversed)
TREE_CHAIN (new_args) = void_list_node;
else
new_reversed = void_list_node;
}
/* Use copy_node to preserve as much as possible from original type
(debug info, attribute lists etc.)
Exception is METHOD_TYPEs must have THIS argument.
When we are asked to remove it, we need to build new FUNCTION_TYPE
instead. */
if (TREE_CODE (orig_type) != METHOD_TYPE
|| !args_to_skip
|| !bitmap_bit_p (args_to_skip, 0))
{
new_type = build_distinct_type_copy (orig_type);
TYPE_ARG_TYPES (new_type) = new_reversed;
}
else
{
new_type
= build_distinct_type_copy (build_function_type (TREE_TYPE (orig_type),
new_reversed));
TYPE_CONTEXT (new_type) = TYPE_CONTEXT (orig_type);
}
if (skip_return)
TREE_TYPE (new_type) = void_type_node;
return new_type;
}
/* Build variant of function decl ORIG_DECL skipping ARGS_TO_SKIP and the
return value if SKIP_RETURN is true.
Arguments from DECL_ARGUMENTS list can't be removed now, since they are
linked by TREE_CHAIN directly. The caller is responsible for eliminating
them when they are being duplicated (i.e. copy_arguments_for_versioning). */
static tree
build_function_decl_skip_args (tree orig_decl, bitmap args_to_skip,
bool skip_return)
{
tree new_decl = copy_node (orig_decl);
tree new_type;
new_type = TREE_TYPE (orig_decl);
if (prototype_p (new_type)
|| (skip_return && !VOID_TYPE_P (TREE_TYPE (new_type))))
new_type
= cgraph_build_function_type_skip_args (new_type, args_to_skip,
skip_return);
TREE_TYPE (new_decl) = new_type;
/* For declarations setting DECL_VINDEX (i.e. methods)
we expect first argument to be THIS pointer. */
if (args_to_skip && bitmap_bit_p (args_to_skip, 0))
DECL_VINDEX (new_decl) = NULL_TREE;
/* When signature changes, we need to clear builtin info. */
if (DECL_BUILT_IN (new_decl)
&& args_to_skip
&& !bitmap_empty_p (args_to_skip))
{
DECL_BUILT_IN_CLASS (new_decl) = NOT_BUILT_IN;
DECL_FUNCTION_CODE (new_decl) = (enum built_in_function) 0;
}
/* The FE might have information and assumptions about the other
arguments. */
DECL_LANG_SPECIFIC (new_decl) = NULL;
return new_decl;
}
/* Set flags of NEW_NODE and its decl. NEW_NODE is a newly created private
clone or its thunk. */
static void
set_new_clone_decl_and_node_flags (cgraph_node *new_node)
{
DECL_EXTERNAL (new_node->decl) = 0;
TREE_PUBLIC (new_node->decl) = 0;
DECL_COMDAT (new_node->decl) = 0;
DECL_WEAK (new_node->decl) = 0;
DECL_VIRTUAL_P (new_node->decl) = 0;
DECL_STATIC_CONSTRUCTOR (new_node->decl) = 0;
DECL_STATIC_DESTRUCTOR (new_node->decl) = 0;
new_node->externally_visible = 0;
new_node->local.local = 1;
new_node->lowered = true;
}
/* Duplicate thunk THUNK if necessary but make it to refer to NODE.
ARGS_TO_SKIP, if non-NULL, determines which parameters should be omitted.
Function can return NODE if no thunk is necessary, which can happen when
thunk is this_adjusting but we are removing this parameter. */
static cgraph_node *
duplicate_thunk_for_node (cgraph_node *thunk, cgraph_node *node)
{
cgraph_node *new_thunk, *thunk_of;
thunk_of = thunk->callees->callee->ultimate_alias_target ();
if (thunk_of->thunk.thunk_p)
node = duplicate_thunk_for_node (thunk_of, node);
if (!DECL_ARGUMENTS (thunk->decl))
thunk->get_untransformed_body ();
cgraph_edge *cs;
for (cs = node->callers; cs; cs = cs->next_caller)
if (cs->caller->thunk.thunk_p
&& cs->caller->thunk.this_adjusting == thunk->thunk.this_adjusting
&& cs->caller->thunk.fixed_offset == thunk->thunk.fixed_offset
&& cs->caller->thunk.virtual_offset_p == thunk->thunk.virtual_offset_p
&& cs->caller->thunk.virtual_value == thunk->thunk.virtual_value)
return cs->caller;
tree new_decl;
if (!node->clone.args_to_skip)
new_decl = copy_node (thunk->decl);
else
{
/* We do not need to duplicate this_adjusting thunks if we have removed
this. */
if (thunk->thunk.this_adjusting
&& bitmap_bit_p (node->clone.args_to_skip, 0))
return node;
new_decl = build_function_decl_skip_args (thunk->decl,
node->clone.args_to_skip,
false);
}
tree *link = &DECL_ARGUMENTS (new_decl);
int i = 0;
for (tree pd = DECL_ARGUMENTS (thunk->decl); pd; pd = DECL_CHAIN (pd), i++)
{
if (!node->clone.args_to_skip
|| !bitmap_bit_p (node->clone.args_to_skip, i))
{
tree nd = copy_node (pd);
DECL_CONTEXT (nd) = new_decl;
*link = nd;
link = &DECL_CHAIN (nd);
}
}
*link = NULL_TREE;
gcc_checking_assert (!DECL_STRUCT_FUNCTION (new_decl));
gcc_checking_assert (!DECL_INITIAL (new_decl));
gcc_checking_assert (!DECL_RESULT (new_decl));
gcc_checking_assert (!DECL_RTL_SET_P (new_decl));
DECL_NAME (new_decl) = clone_function_name (thunk->decl, "artificial_thunk");
SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
new_thunk = cgraph_node::create (new_decl);
set_new_clone_decl_and_node_flags (new_thunk);
new_thunk->definition = true;
new_thunk->local.can_change_signature = node->local.can_change_signature;
new_thunk->thunk = thunk->thunk;
new_thunk->unique_name = in_lto_p;
new_thunk->former_clone_of = thunk->decl;
new_thunk->clone.args_to_skip = node->clone.args_to_skip;
new_thunk->clone.combined_args_to_skip = node->clone.combined_args_to_skip;
cgraph_edge *e = new_thunk->create_edge (node, NULL, new_thunk->count);
symtab->call_edge_duplication_hooks (thunk->callees, e);
symtab->call_cgraph_duplication_hooks (thunk, new_thunk);
return new_thunk;
}
/* If E does not lead to a thunk, simply redirect it to N. Otherwise create
one or more equivalent thunks for N and redirect E to the first in the
chain. Note that it is then necessary to call
n->expand_all_artificial_thunks once all callers are redirected. */
void
cgraph_edge::redirect_callee_duplicating_thunks (cgraph_node *n)
{
cgraph_node *orig_to = callee->ultimate_alias_target ();
if (orig_to->thunk.thunk_p)
n = duplicate_thunk_for_node (orig_to, n);
redirect_callee (n);
}
/* Call expand_thunk on all callers that are thunks and if analyze those nodes
that were expanded. */
void
cgraph_node::expand_all_artificial_thunks ()
{
cgraph_edge *e;
for (e = callers; e;)
if (e->caller->thunk.thunk_p)
{
cgraph_node *thunk = e->caller;
e = e->next_caller;
if (thunk->expand_thunk (false, false))
{
thunk->thunk.thunk_p = false;
thunk->analyze ();
}
thunk->expand_all_artificial_thunks ();
}
else
e = e->next_caller;
}
void
dump_callgraph_transformation (const cgraph_node *original,
const cgraph_node *clone,
const char *suffix)
{
if (symtab->ipa_clones_dump_file)
{
fprintf (symtab->ipa_clones_dump_file,
"Callgraph clone;%s;%d;%s;%d;%d;%s;%d;%s;%d;%d;%s\n",
original->asm_name (), original->order,
DECL_SOURCE_FILE (original->decl),
DECL_SOURCE_LINE (original->decl),
DECL_SOURCE_COLUMN (original->decl), clone->asm_name (),
clone->order, DECL_SOURCE_FILE (clone->decl),
DECL_SOURCE_LINE (clone->decl), DECL_SOURCE_COLUMN (clone->decl),
suffix);
symtab->cloned_nodes.add (original);
symtab->cloned_nodes.add (clone);
}
}
/* Create node representing clone of N executed COUNT times. Decrease
the execution counts from original node too.
The new clone will have decl set to DECL that may or may not be the same
as decl of N.
When UPDATE_ORIGINAL is true, the counts are subtracted from the original
function's profile to reflect the fact that part of execution is handled
by node.
When CALL_DUPLICATOIN_HOOK is true, the ipa passes are acknowledged about
the new clone. Otherwise the caller is responsible for doing so later.
If the new node is being inlined into another one, NEW_INLINED_TO should be
the outline function the new one is (even indirectly) inlined to. All hooks
will see this in node's global.inlined_to, when invoked. Can be NULL if the
node is not inlined. */
cgraph_node *
cgraph_node::create_clone (tree new_decl, profile_count prof_count,
bool update_original,
vec<cgraph_edge *> redirect_callers,
bool call_duplication_hook,
cgraph_node *new_inlined_to,
bitmap args_to_skip, const char *suffix)
{
cgraph_node *new_node = symtab->create_empty ();
cgraph_edge *e;
unsigned i;
profile_count old_count = count;
if (new_inlined_to)
dump_callgraph_transformation (this, new_inlined_to, "inlining to");
/* When inlining we scale precisely to prof_count, when cloning we can
preserve local profile. */
if (!new_inlined_to)
prof_count = count.combine_with_ipa_count (prof_count);
new_node->count = prof_count;
/* Update IPA profile. Local profiles need no updating in original. */
if (update_original)
count = count.combine_with_ipa_count (count.ipa () - prof_count.ipa ());
new_node->decl = new_decl;
new_node->register_symbol ();
new_node->origin = origin;
new_node->lto_file_data = lto_file_data;
if (new_node->origin)
{
new_node->next_nested = new_node->origin->nested;
new_node->origin->nested = new_node;
}
new_node->analyzed = analyzed;
new_node->definition = definition;
new_node->local = local;
new_node->externally_visible = false;
new_node->no_reorder = no_reorder;
new_node->local.local = true;
new_node->global = global;
new_node->global.inlined_to = new_inlined_to;
new_node->rtl = rtl;
new_node->frequency = frequency;
new_node->tp_first_run = tp_first_run;
new_node->tm_clone = tm_clone;
new_node->icf_merged = icf_merged;
new_node->merged_comdat = merged_comdat;
new_node->thunk = thunk;
new_node->clone.tree_map = NULL;
new_node->clone.args_to_skip = args_to_skip;
new_node->split_part = split_part;
if (!args_to_skip)
new_node->clone.combined_args_to_skip = clone.combined_args_to_skip;
else if (clone.combined_args_to_skip)
{
new_node->clone.combined_args_to_skip = BITMAP_GGC_ALLOC ();
bitmap_ior (new_node->clone.combined_args_to_skip,
clone.combined_args_to_skip, args_to_skip);
}
else
new_node->clone.combined_args_to_skip = args_to_skip;
FOR_EACH_VEC_ELT (redirect_callers, i, e)
{
/* Redirect calls to the old version node to point to its new
version. The only exception is when the edge was proved to
be unreachable during the clonning procedure. */
if (!e->callee
|| DECL_BUILT_IN_CLASS (e->callee->decl) != BUILT_IN_NORMAL
|| DECL_FUNCTION_CODE (e->callee->decl) != BUILT_IN_UNREACHABLE)
e->redirect_callee_duplicating_thunks (new_node);
}
new_node->expand_all_artificial_thunks ();
for (e = callees;e; e=e->next_callee)
e->clone (new_node, e->call_stmt, e->lto_stmt_uid, new_node->count, old_count,
update_original);
for (e = indirect_calls; e; e = e->next_callee)
e->clone (new_node, e->call_stmt, e->lto_stmt_uid,
new_node->count, old_count, update_original);
new_node->clone_references (this);
new_node->next_sibling_clone = clones;
if (clones)
clones->prev_sibling_clone = new_node;
clones = new_node;
new_node->clone_of = this;
if (call_duplication_hook)
symtab->call_cgraph_duplication_hooks (this, new_node);
if (!new_inlined_to)
dump_callgraph_transformation (this, new_node, suffix);
return new_node;
}
static GTY(()) unsigned int clone_fn_id_num;
/* Return a new assembler name for a clone with SUFFIX of a decl named
NAME. */
tree
clone_function_name_1 (const char *name, const char *suffix)
{
size_t len = strlen (name);
char *tmp_name, *prefix;
prefix = XALLOCAVEC (char, len + strlen (suffix) + 2);
memcpy (prefix, name, len);
strcpy (prefix + len + 1, suffix);
prefix[len] = symbol_table::symbol_suffix_separator ();
ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix, clone_fn_id_num++);
return get_identifier (tmp_name);
}
/* Return a new assembler name for a clone of DECL with SUFFIX. */
tree
clone_function_name (tree decl, const char *suffix)
{
tree name = DECL_ASSEMBLER_NAME (decl);
return clone_function_name_1 (IDENTIFIER_POINTER (name), suffix);
}
/* Create callgraph node clone with new declaration. The actual body will
be copied later at compilation stage.
TODO: after merging in ipa-sra use function call notes instead of args_to_skip
bitmap interface.
*/
cgraph_node *
cgraph_node::create_virtual_clone (vec<cgraph_edge *> redirect_callers,
vec<ipa_replace_map *, va_gc> *tree_map,
bitmap args_to_skip, const char * suffix)
{
tree old_decl = decl;
cgraph_node *new_node = NULL;
tree new_decl;
size_t len, i;
ipa_replace_map *map;
char *name;
gcc_checking_assert (local.versionable);
gcc_assert (local.can_change_signature || !args_to_skip);
/* Make a new FUNCTION_DECL tree node */
if (!args_to_skip)
new_decl = copy_node (old_decl);
else
new_decl = build_function_decl_skip_args (old_decl, args_to_skip, false);
/* These pointers represent function body and will be populated only when clone
is materialized. */
gcc_assert (new_decl != old_decl);
DECL_STRUCT_FUNCTION (new_decl) = NULL;
DECL_ARGUMENTS (new_decl) = NULL;
DECL_INITIAL (new_decl) = NULL;
DECL_RESULT (new_decl) = NULL;
/* We can not do DECL_RESULT (new_decl) = NULL; here because of LTO partitioning
sometimes storing only clone decl instead of original. */
/* Generate a new name for the new version. */
len = IDENTIFIER_LENGTH (DECL_NAME (old_decl));
name = XALLOCAVEC (char, len + strlen (suffix) + 2);
memcpy (name, IDENTIFIER_POINTER (DECL_NAME (old_decl)), len);
strcpy (name + len + 1, suffix);
name[len] = '.';
DECL_NAME (new_decl) = get_identifier (name);
SET_DECL_ASSEMBLER_NAME (new_decl, clone_function_name (old_decl, suffix));
SET_DECL_RTL (new_decl, NULL);
new_node = create_clone (new_decl, count, false,
redirect_callers, false, NULL, args_to_skip, suffix);
/* Update the properties.
Make clone visible only within this translation unit. Make sure
that is not weak also.
??? We cannot use COMDAT linkage because there is no
ABI support for this. */
set_new_clone_decl_and_node_flags (new_node);
new_node->clone.tree_map = tree_map;
if (!implicit_section)
new_node->set_section (get_section ());
/* Clones of global symbols or symbols with unique names are unique. */
if ((TREE_PUBLIC (old_decl)
&& !DECL_EXTERNAL (old_decl)
&& !DECL_WEAK (old_decl)
&& !DECL_COMDAT (old_decl))
|| in_lto_p)
new_node->unique_name = true;
FOR_EACH_VEC_SAFE_ELT (tree_map, i, map)
new_node->maybe_create_reference (map->new_tree, NULL);
if (ipa_transforms_to_apply.exists ())
new_node->ipa_transforms_to_apply
= ipa_transforms_to_apply.copy ();
symtab->call_cgraph_duplication_hooks (this, new_node);
return new_node;
}
/* callgraph node being removed from symbol table; see if its entry can be
replaced by other inline clone. */
cgraph_node *
cgraph_node::find_replacement (void)
{
cgraph_node *next_inline_clone, *replacement;
for (next_inline_clone = clones;
next_inline_clone
&& next_inline_clone->decl != decl;
next_inline_clone = next_inline_clone->next_sibling_clone)
;
/* If there is inline clone of the node being removed, we need
to put it into the position of removed node and reorganize all
other clones to be based on it. */
if (next_inline_clone)
{
cgraph_node *n;
cgraph_node *new_clones;
replacement = next_inline_clone;
/* Unlink inline clone from the list of clones of removed node. */
if (next_inline_clone->next_sibling_clone)
next_inline_clone->next_sibling_clone->prev_sibling_clone
= next_inline_clone->prev_sibling_clone;
if (next_inline_clone->prev_sibling_clone)
{
gcc_assert (clones != next_inline_clone);
next_inline_clone->prev_sibling_clone->next_sibling_clone
= next_inline_clone->next_sibling_clone;
}
else
{
gcc_assert (clones == next_inline_clone);
clones = next_inline_clone->next_sibling_clone;
}
new_clones = clones;
clones = NULL;
/* Copy clone info. */
next_inline_clone->clone = clone;
/* Now place it into clone tree at same level at NODE. */
next_inline_clone->clone_of = clone_of;
next_inline_clone->prev_sibling_clone = NULL;
next_inline_clone->next_sibling_clone = NULL;
if (clone_of)
{
if (clone_of->clones)
clone_of->clones->prev_sibling_clone = next_inline_clone;
next_inline_clone->next_sibling_clone = clone_of->clones;
clone_of->clones = next_inline_clone;
}
/* Merge the clone list. */
if (new_clones)
{
if (!next_inline_clone->clones)
next_inline_clone->clones = new_clones;
else
{
n = next_inline_clone->clones;
while (n->next_sibling_clone)
n = n->next_sibling_clone;
n->next_sibling_clone = new_clones;
new_clones->prev_sibling_clone = n;
}
}
/* Update clone_of pointers. */
n = new_clones;
while (n)
{
n->clone_of = next_inline_clone;
n = n->next_sibling_clone;
}
return replacement;
}
else
return NULL;
}
/* Like cgraph_set_call_stmt but walk the clone tree and update all
clones sharing the same function body.
When WHOLE_SPECULATIVE_EDGES is true, all three components of
speculative edge gets updated. Otherwise we update only direct
call. */
void
cgraph_node::set_call_stmt_including_clones (gimple *old_stmt,
gcall *new_stmt,
bool update_speculative)
{
cgraph_node *node;
cgraph_edge *edge = get_edge (old_stmt);
if (edge)
edge->set_call_stmt (new_stmt, update_speculative);
node = clones;
if (node)
while (node != this)
{
cgraph_edge *edge = node->get_edge (old_stmt);
if (edge)
{
edge->set_call_stmt (new_stmt, update_speculative);
/* If UPDATE_SPECULATIVE is false, it means that we are turning
speculative call into a real code sequence. Update the
callgraph edges. */
if (edge->speculative && !update_speculative)
{
cgraph_edge *direct, *indirect;
ipa_ref *ref;
gcc_assert (!edge->indirect_unknown_callee);
edge->speculative_call_info (direct, indirect, ref);
direct->speculative = false;
indirect->speculative = false;
ref->speculative = false;
}
}
if (node->clones)
node = node->clones;
else if (node->next_sibling_clone)
node = node->next_sibling_clone;
else
{
while (node != this && !node->next_sibling_clone)
node = node->clone_of;
if (node != this)
node = node->next_sibling_clone;
}
}
}
/* Like cgraph_create_edge walk the clone tree and update all clones sharing
same function body. If clones already have edge for OLD_STMT; only
update the edge same way as cgraph_set_call_stmt_including_clones does.
TODO: COUNT and LOOP_DEPTH should be properly distributed based on relative
frequencies of the clones. */
void
cgraph_node::create_edge_including_clones (cgraph_node *callee,
gimple *old_stmt, gcall *stmt,
profile_count count,
cgraph_inline_failed_t reason)
{
cgraph_node *node;
cgraph_edge *edge;
if (!get_edge (stmt))
{
edge = create_edge (callee, stmt, count);
edge->inline_failed = reason;
}
node = clones;
if (node)
while (node != this)
/* Thunk clones do not get updated while copying inline function body. */
if (!node->thunk.thunk_p)
{
cgraph_edge *edge = node->get_edge (old_stmt);
/* It is possible that clones already contain the edge while
master didn't. Either we promoted indirect call into direct
call in the clone or we are processing clones of unreachable
master where edges has been removed. */
if (edge)
edge->set_call_stmt (stmt);
else if (! node->get_edge (stmt))
{
edge = node->create_edge (callee, stmt, count);
edge->inline_failed = reason;
}
if (node->clones)
node = node->clones;
else if (node->next_sibling_clone)
node = node->next_sibling_clone;
else
{
while (node != this && !node->next_sibling_clone)
node = node->clone_of;
if (node != this)
node = node->next_sibling_clone;
}
}
}
/* Remove the node from cgraph and all inline clones inlined into it.
Skip however removal of FORBIDDEN_NODE and return true if it needs to be
removed. This allows to call the function from outer loop walking clone
tree. */
bool
cgraph_node::remove_symbol_and_inline_clones (cgraph_node *forbidden_node)
{
cgraph_edge *e, *next;
bool found = false;
if (this == forbidden_node)
{
callers->remove ();
return true;
}
for (e = callees; e; e = next)
{
next = e->next_callee;
if (!e->inline_failed)
found |= e->callee->remove_symbol_and_inline_clones (forbidden_node);
}
remove ();
return found;
}
/* The edges representing the callers of the NEW_VERSION node were
fixed by cgraph_function_versioning (), now the call_expr in their
respective tree code should be updated to call the NEW_VERSION. */
static void
update_call_expr (cgraph_node *new_version)
{
cgraph_edge *e;
gcc_assert (new_version);
/* Update the call expr on the edges to call the new version. */
for (e = new_version->callers; e; e = e->next_caller)
{
function *inner_function = DECL_STRUCT_FUNCTION (e->caller->decl);
gimple_call_set_fndecl (e->call_stmt, new_version->decl);
maybe_clean_eh_stmt_fn (inner_function, e->call_stmt);
}
}
/* Create a new cgraph node which is the new version of
callgraph node. REDIRECT_CALLERS holds the callers
edges which should be redirected to point to
NEW_VERSION. ALL the callees edges of the node
are cloned to the new version node. Return the new
version node.
If non-NULL BLOCK_TO_COPY determine what basic blocks
was copied to prevent duplications of calls that are dead
in the clone. */
cgraph_node *
cgraph_node::create_version_clone (tree new_decl,
vec<cgraph_edge *> redirect_callers,
bitmap bbs_to_copy,
const char *suffix)
{
cgraph_node *new_version;
cgraph_edge *e;
unsigned i;
new_version = cgraph_node::create (new_decl);
new_version->analyzed = analyzed;
new_version->definition = definition;
new_version->local = local;
new_version->externally_visible = false;
new_version->no_reorder = no_reorder;
new_version->local.local = new_version->definition;
new_version->global = global;
new_version->rtl = rtl;
new_version->count = count;
for (e = callees; e; e=e->next_callee)
if (!bbs_to_copy
|| bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index))
e->clone (new_version, e->call_stmt,
e->lto_stmt_uid, count, count,
true);
for (e = indirect_calls; e; e=e->next_callee)
if (!bbs_to_copy
|| bitmap_bit_p (bbs_to_copy, gimple_bb (e->call_stmt)->index))
e->clone (new_version, e->call_stmt,
e->lto_stmt_uid, count, count,
true);
FOR_EACH_VEC_ELT (redirect_callers, i, e)
{
/* Redirect calls to the old version node to point to its new
version. */
e->redirect_callee (new_version);
}
symtab->call_cgraph_duplication_hooks (this, new_version);
dump_callgraph_transformation (this, new_version, suffix);
return new_version;
}
/* Perform function versioning.
Function versioning includes copying of the tree and
a callgraph update (creating a new cgraph node and updating
its callees and callers).
REDIRECT_CALLERS varray includes the edges to be redirected
to the new version.
TREE_MAP is a mapping of tree nodes we want to replace with
new ones (according to results of prior analysis).
If non-NULL ARGS_TO_SKIP determine function parameters to remove
from new version.
If SKIP_RETURN is true, the new version will return void.
If non-NULL BLOCK_TO_COPY determine what basic blocks to copy.
If non_NULL NEW_ENTRY determine new entry BB of the clone.
Return the new version's cgraph node. */
cgraph_node *
cgraph_node::create_version_clone_with_body
(vec<cgraph_edge *> redirect_callers,
vec<ipa_replace_map *, va_gc> *tree_map, bitmap args_to_skip,
bool skip_return, bitmap bbs_to_copy, basic_block new_entry_block,
const char *suffix)
{
tree old_decl = decl;
cgraph_node *new_version_node = NULL;
tree new_decl;
if (!tree_versionable_function_p (old_decl))
return NULL;
gcc_assert (local.can_change_signature || !args_to_skip);
/* Make a new FUNCTION_DECL tree node for the new version. */
if (!args_to_skip && !skip_return)
new_decl = copy_node (old_decl);
else
new_decl
= build_function_decl_skip_args (old_decl, args_to_skip, skip_return);
/* Generate a new name for the new version. */
DECL_NAME (new_decl) = clone_function_name (old_decl, suffix);
SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
SET_DECL_RTL (new_decl, NULL);
/* When the old decl was a con-/destructor make sure the clone isn't. */
DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
DECL_STATIC_DESTRUCTOR (new_decl) = 0;
/* Create the new version's call-graph node.
and update the edges of the new node. */
new_version_node = create_version_clone (new_decl, redirect_callers,
bbs_to_copy, suffix);
if (ipa_transforms_to_apply.exists ())
new_version_node->ipa_transforms_to_apply
= ipa_transforms_to_apply.copy ();
/* Copy the OLD_VERSION_NODE function tree to the new version. */
tree_function_versioning (old_decl, new_decl, tree_map, false, args_to_skip,
skip_return, bbs_to_copy, new_entry_block);
/* Update the new version's properties.
Make The new version visible only within this translation unit. Make sure
that is not weak also.
??? We cannot use COMDAT linkage because there is no
ABI support for this. */
new_version_node->make_decl_local ();
DECL_VIRTUAL_P (new_version_node->decl) = 0;
new_version_node->externally_visible = 0;
new_version_node->local.local = 1;
new_version_node->lowered = true;
if (!implicit_section)
new_version_node->set_section (get_section ());
/* Clones of global symbols or symbols with unique names are unique. */
if ((TREE_PUBLIC (old_decl)
&& !DECL_EXTERNAL (old_decl)
&& !DECL_WEAK (old_decl)
&& !DECL_COMDAT (old_decl))
|| in_lto_p)
new_version_node->unique_name = true;
/* Update the call_expr on the edges to call the new version node. */
update_call_expr (new_version_node);
symtab->call_cgraph_insertion_hooks (new_version_node);
return new_version_node;
}
/* Given virtual clone, turn it into actual clone. */
static void
cgraph_materialize_clone (cgraph_node *node)
{
bitmap_obstack_initialize (NULL);
node->former_clone_of = node->clone_of->decl;
if (node->clone_of->former_clone_of)
node->former_clone_of = node->clone_of->former_clone_of;
/* Copy the OLD_VERSION_NODE function tree to the new version. */
tree_function_versioning (node->clone_of->decl, node->decl,
node->clone.tree_map, true,
node->clone.args_to_skip, false,
NULL, NULL);
if (symtab->dump_file)
{
dump_function_to_file (node->clone_of->decl, symtab->dump_file,
dump_flags);
dump_function_to_file (node->decl, symtab->dump_file, dump_flags);
}
/* Function is no longer clone. */
if (node->next_sibling_clone)
node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone;
if (node->prev_sibling_clone)
node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone;
else
node->clone_of->clones = node->next_sibling_clone;
node->next_sibling_clone = NULL;
node->prev_sibling_clone = NULL;
if (!node->clone_of->analyzed && !node->clone_of->clones)
{
node->clone_of->release_body ();
node->clone_of->remove_callees ();
node->clone_of->remove_all_references ();
}
node->clone_of = NULL;
bitmap_obstack_release (NULL);
}
/* Once all functions from compilation unit are in memory, produce all clones
and update all calls. We might also do this on demand if we don't want to
bring all functions to memory prior compilation, but current WHOPR
implementation does that and it is a bit easier to keep everything right in
this order. */
void
symbol_table::materialize_all_clones (void)
{
cgraph_node *node;
bool stabilized = false;
if (symtab->dump_file)
fprintf (symtab->dump_file, "Materializing clones\n");
cgraph_node::checking_verify_cgraph_nodes ();
/* We can also do topological order, but number of iterations should be
bounded by number of IPA passes since single IPA pass is probably not
going to create clones of clones it created itself. */
while (!stabilized)
{
stabilized = true;
FOR_EACH_FUNCTION (node)
{
if (node->clone_of && node->decl != node->clone_of->decl
&& !gimple_has_body_p (node->decl))
{
if (!node->clone_of->clone_of)
node->clone_of->get_untransformed_body ();
if (gimple_has_body_p (node->clone_of->decl))
{
if (symtab->dump_file)
{
fprintf (symtab->dump_file, "cloning %s to %s\n",
xstrdup_for_dump (node->clone_of->name ()),
xstrdup_for_dump (node->name ()));
if (node->clone.tree_map)
{
unsigned int i;
fprintf (symtab->dump_file, " replace map: ");
for (i = 0;
i < vec_safe_length (node->clone.tree_map);
i++)
{
ipa_replace_map *replace_info;
replace_info = (*node->clone.tree_map)[i];
print_generic_expr (symtab->dump_file,
replace_info->old_tree);
fprintf (symtab->dump_file, " -> ");
print_generic_expr (symtab->dump_file,
replace_info->new_tree);
fprintf (symtab->dump_file, "%s%s;",
replace_info->replace_p ? "(replace)":"",
replace_info->ref_p ? "(ref)":"");
}
fprintf (symtab->dump_file, "\n");
}
if (node->clone.args_to_skip)
{
fprintf (symtab->dump_file, " args_to_skip: ");
dump_bitmap (symtab->dump_file,
node->clone.args_to_skip);
}
if (node->clone.args_to_skip)
{
fprintf (symtab->dump_file, " combined_args_to_skip:");
dump_bitmap (symtab->dump_file, node->clone.combined_args_to_skip);
}
}
cgraph_materialize_clone (node);
stabilized = false;
}
}
}
}
FOR_EACH_FUNCTION (node)
if (!node->analyzed && node->callees)
{
node->remove_callees ();
node->remove_all_references ();
}
else
node->clear_stmts_in_references ();
if (symtab->dump_file)
fprintf (symtab->dump_file, "Materialization Call site updates done.\n");
cgraph_node::checking_verify_cgraph_nodes ();
symtab->remove_unreachable_nodes (symtab->dump_file);
}
#include "gt-cgraphclones.h"