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ipa.c (cgraph_non_local_node_p_1, [...]): Move to ipa-visibility.c

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* ipa.c (cgraph_non_local_node_p_1, cgraph_local_node_p, address_taken_from_non_vtable_p,
	comdat_can_be_unshared_p_1, comdat_can_be_unshared_p, cgraph_externally_visible_p,
	varpool_externally_visible_p, can_replace_by_local_alias,
	update_visibility_by_resolution_info, function_and_variable_visibility,
	pass_data_ipa_function_and_variable_visibility,
	make_pass_ipa_function_and_variable_visibility,
	whole_program_function_and_variable_visibility,
	pass_data_ipa_whole_program_visibility,
	make_pass_ipa_whole_program_visibility): Move to ipa-visibility.c
	* cgraph.h (cgraph_local_node_p): Declare.
	* ipa-visibility.c: New file.
	* Makefile.in (OBJS): Add ipa-visiblity.o

From-SVN: r210907
This commit is contained in:
Jan Hubicka 2014-05-25 03:33:28 +02:00 committed by Jan Hubicka
parent 876814dba3
commit 7f7beb3f10
5 changed files with 778 additions and 682 deletions

15
gcc/ChangeLog

@ -1,3 +1,18 @@
2014-05-23 Jan Hubicka <hubicka@ucw.cz>
* ipa.c (cgraph_non_local_node_p_1, cgraph_local_node_p, address_taken_from_non_vtable_p,
comdat_can_be_unshared_p_1, comdat_can_be_unshared_p, cgraph_externally_visible_p,
varpool_externally_visible_p, can_replace_by_local_alias,
update_visibility_by_resolution_info, function_and_variable_visibility,
pass_data_ipa_function_and_variable_visibility,
make_pass_ipa_function_and_variable_visibility,
whole_program_function_and_variable_visibility,
pass_data_ipa_whole_program_visibility,
make_pass_ipa_whole_program_visibility): Move to ipa-visibility.c
* cgraph.h (cgraph_local_node_p): Declare.
* ipa-visibility.c: New file.
* Makefile.in (OBJS): Add ipa-visiblity.o
2014-05-23 Jan Hubicka <hubicka@ucw.cz>
* gimple-fold.c (can_refer_decl_in_current_unit_p): Be sure

1
gcc/Makefile.in

@ -1270,6 +1270,7 @@ OBJS = \
ipa-split.o \
ipa-inline.o \
ipa-comdats.o \
ipa-visibility.o \
ipa-inline-analysis.o \
ipa-inline-transform.o \
ipa-profile.o \

4
gcc/cgraph.h

@ -963,6 +963,10 @@ void free_varpool_node_set (varpool_node_set);
void ipa_discover_readonly_nonaddressable_vars (void);
bool varpool_externally_visible_p (varpool_node *);
/* In ipa-visibility.c */
bool cgraph_local_node_p (struct cgraph_node *);
/* In predict.c */
bool cgraph_maybe_hot_edge_p (struct cgraph_edge *e);
bool cgraph_optimize_for_size_p (struct cgraph_node *);

758
gcc/ipa-visibility.c Normal file

@ -0,0 +1,758 @@
/* IPA visibility pass
Copyright (C) 2003-2014 Free Software Foundation, Inc.
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 implements two related passes:
- pass_data_ipa_function_and_variable_visibility run just after
symbol table, references and callgraph are built
- pass_data_ipa_function_and_variable_visibility run as first
proper IPA pass (that is after early optimization, or, (with LTO)
as a first pass done at link-time.
Purpose of both passes is to set correctly visibility properties
of all symbols. This includes:
- Symbol privatization:
Some symbols that are declared public by frontend may be
turned local (either by -fwhole-program flag, by linker plugin feedback
or by other reasons)
- Discovery of local functions:
A local function is one whose calls can occur only in the current
compilation unit and all its calls are explicit, so we can change
its calling convention. We simply mark all static functions whose
address is not taken as local.
externally_visible flag is set for symbols that can not be privatized.
For privatized symbols we clear TREE_PUBLIC flag and dismantle comdat
group.
- Dismantling of comdat groups:
Comdat group represent a section that may be replaced by linker by
a different copy of the same section from other unit.
If we have resolution information (from linker plugin) and we know that
a given comdat gorup is prevailing, we can dismantle it and turn symbols
into normal symbols. If the resolution information says that the
section was previaled by copy from non-LTO code, we can also dismantle
it and turn all symbols into external.
- Local aliases:
Some symbols can be interposed by dynamic linker. Refering to these
symbols is expensive, since it needs to be overwritable by the dynamic
linker. In some cases we know that the interposition does not change
semantic and we can always refer to a local copy (as in the case of
inline function). In this case we produce a local alias and redirect
calls to it.
TODO: This should be done for references, too.
- Removal of static ocnstructors and destructors that have no side effects.
- Regularization of several oddities introduced by frontends that may
be impractical later in the optimization queue. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "cgraph.h"
#include "tree-pass.h"
#include "pointer-set.h"
#include "calls.h"
#include "gimple-expr.h"
/* Return true when NODE can not be local. Worker for cgraph_local_node_p. */
static bool
cgraph_non_local_node_p_1 (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
{
/* FIXME: Aliases can be local, but i386 gets thunks wrong then. */
return !(cgraph_only_called_directly_or_aliased_p (node)
&& !ipa_ref_has_aliases_p (&node->ref_list)
&& node->definition
&& !DECL_EXTERNAL (node->decl)
&& !node->externally_visible
&& !node->used_from_other_partition
&& !node->in_other_partition);
}
/* Return true when function can be marked local. */
bool
cgraph_local_node_p (struct cgraph_node *node)
{
struct cgraph_node *n = cgraph_function_or_thunk_node (node, NULL);
/* FIXME: thunks can be considered local, but we need prevent i386
from attempting to change calling convention of them. */
if (n->thunk.thunk_p)
return false;
return !cgraph_for_node_and_aliases (n,
cgraph_non_local_node_p_1, NULL, true);
}
/* Return true when there is a reference to node and it is not vtable. */
static bool
address_taken_from_non_vtable_p (symtab_node *node)
{
int i;
struct ipa_ref *ref;
for (i = 0; ipa_ref_list_referring_iterate (&node->ref_list,
i, ref); i++)
if (ref->use == IPA_REF_ADDR)
{
varpool_node *node;
if (is_a <cgraph_node *> (ref->referring))
return true;
node = ipa_ref_referring_varpool_node (ref);
if (!DECL_VIRTUAL_P (node->decl))
return true;
}
return false;
}
/* A helper for comdat_can_be_unshared_p. */
static bool
comdat_can_be_unshared_p_1 (symtab_node *node)
{
if (!node->externally_visible)
return true;
/* When address is taken, we don't know if equality comparison won't
break eventually. Exception are virutal functions, C++
constructors/destructors and vtables, where this is not possible by
language standard. */
if (!DECL_VIRTUAL_P (node->decl)
&& (TREE_CODE (node->decl) != FUNCTION_DECL
|| (!DECL_CXX_CONSTRUCTOR_P (node->decl)
&& !DECL_CXX_DESTRUCTOR_P (node->decl)))
&& address_taken_from_non_vtable_p (node))
return false;
/* If the symbol is used in some weird way, better to not touch it. */
if (node->force_output)
return false;
/* Explicit instantiations needs to be output when possibly
used externally. */
if (node->forced_by_abi
&& TREE_PUBLIC (node->decl)
&& (node->resolution != LDPR_PREVAILING_DEF_IRONLY
&& !flag_whole_program))
return false;
/* Non-readonly and volatile variables can not be duplicated. */
if (is_a <varpool_node *> (node)
&& (!TREE_READONLY (node->decl)
|| TREE_THIS_VOLATILE (node->decl)))
return false;
return true;
}
/* COMDAT functions must be shared only if they have address taken,
otherwise we can produce our own private implementation with
-fwhole-program.
Return true when turning COMDAT functoin static can not lead to wrong
code when the resulting object links with a library defining same COMDAT.
Virtual functions do have their addresses taken from the vtables,
but in C++ there is no way to compare their addresses for equality. */
static bool
comdat_can_be_unshared_p (symtab_node *node)
{
if (!comdat_can_be_unshared_p_1 (node))
return false;
if (node->same_comdat_group)
{
symtab_node *next;
/* If more than one function is in the same COMDAT group, it must
be shared even if just one function in the comdat group has
address taken. */
for (next = node->same_comdat_group;
next != node; next = next->same_comdat_group)
if (!comdat_can_be_unshared_p_1 (next))
return false;
}
return true;
}
/* Return true when function NODE should be considered externally visible. */
static bool
cgraph_externally_visible_p (struct cgraph_node *node,
bool whole_program)
{
if (!node->definition)
return false;
if (!TREE_PUBLIC (node->decl)
|| DECL_EXTERNAL (node->decl))
return false;
/* Do not try to localize built-in functions yet. One of problems is that we
end up mangling their asm for WHOPR that makes it impossible to call them
using the implicit built-in declarations anymore. Similarly this enables
us to remove them as unreachable before actual calls may appear during
expansion or folding. */
if (DECL_BUILT_IN (node->decl))
return true;
/* If linker counts on us, we must preserve the function. */
if (symtab_used_from_object_file_p (node))
return true;
if (DECL_PRESERVE_P (node->decl))
return true;
if (lookup_attribute ("externally_visible",
DECL_ATTRIBUTES (node->decl)))
return true;
if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
&& lookup_attribute ("dllexport",
DECL_ATTRIBUTES (node->decl)))
return true;
if (node->resolution == LDPR_PREVAILING_DEF_IRONLY)
return false;
/* When doing LTO or whole program, we can bring COMDAT functoins static.
This improves code quality and we know we will duplicate them at most twice
(in the case that we are not using plugin and link with object file
implementing same COMDAT) */
if ((in_lto_p || whole_program)
&& DECL_COMDAT (node->decl)
&& comdat_can_be_unshared_p (node))
return false;
/* When doing link time optimizations, hidden symbols become local. */
if (in_lto_p
&& (DECL_VISIBILITY (node->decl) == VISIBILITY_HIDDEN
|| DECL_VISIBILITY (node->decl) == VISIBILITY_INTERNAL)
/* Be sure that node is defined in IR file, not in other object
file. In that case we don't set used_from_other_object_file. */
&& node->definition)
;
else if (!whole_program)
return true;
if (MAIN_NAME_P (DECL_NAME (node->decl)))
return true;
return false;
}
/* Return true when variable VNODE should be considered externally visible. */
bool
varpool_externally_visible_p (varpool_node *vnode)
{
if (DECL_EXTERNAL (vnode->decl))
return true;
if (!TREE_PUBLIC (vnode->decl))
return false;
/* If linker counts on us, we must preserve the function. */
if (symtab_used_from_object_file_p (vnode))
return true;
if (DECL_HARD_REGISTER (vnode->decl))
return true;
if (DECL_PRESERVE_P (vnode->decl))
return true;
if (lookup_attribute ("externally_visible",
DECL_ATTRIBUTES (vnode->decl)))
return true;
if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
&& lookup_attribute ("dllexport",
DECL_ATTRIBUTES (vnode->decl)))
return true;
/* See if we have linker information about symbol not being used or
if we need to make guess based on the declaration.
Even if the linker clams the symbol is unused, never bring internal
symbols that are declared by user as used or externally visible.
This is needed for i.e. references from asm statements. */
if (symtab_used_from_object_file_p (vnode))
return true;
if (vnode->resolution == LDPR_PREVAILING_DEF_IRONLY)
return false;
/* As a special case, the COMDAT virtual tables can be unshared.
In LTO mode turn vtables into static variables. The variable is readonly,
so this does not enable more optimization, but referring static var
is faster for dynamic linking. Also this match logic hidding vtables
from LTO symbol tables. */
if ((in_lto_p || flag_whole_program)
&& DECL_COMDAT (vnode->decl)
&& comdat_can_be_unshared_p (vnode))
return false;
/* When doing link time optimizations, hidden symbols become local. */
if (in_lto_p
&& (DECL_VISIBILITY (vnode->decl) == VISIBILITY_HIDDEN
|| DECL_VISIBILITY (vnode->decl) == VISIBILITY_INTERNAL)
/* Be sure that node is defined in IR file, not in other object
file. In that case we don't set used_from_other_object_file. */
&& vnode->definition)
;
else if (!flag_whole_program)
return true;
/* Do not attempt to privatize COMDATS by default.
This would break linking with C++ libraries sharing
inline definitions.
FIXME: We can do so for readonly vars with no address taken and
possibly also for vtables since no direct pointer comparsion is done.
It might be interesting to do so to reduce linking overhead. */
if (DECL_COMDAT (vnode->decl) || DECL_WEAK (vnode->decl))
return true;
return false;
}
/* Return true if reference to NODE can be replaced by a local alias.
Local aliases save dynamic linking overhead and enable more optimizations.
*/
bool
can_replace_by_local_alias (symtab_node *node)
{
return (symtab_node_availability (node) > AVAIL_OVERWRITABLE
&& !symtab_can_be_discarded (node));
}
/* In LTO we can remove COMDAT groups and weak symbols.
Either turn them into normal symbols or external symbol depending on
resolution info. */
static void
update_visibility_by_resolution_info (symtab_node * node)
{
bool define;
if (!node->externally_visible
|| (!DECL_WEAK (node->decl) && !DECL_ONE_ONLY (node->decl))
|| node->resolution == LDPR_UNKNOWN)
return;
define = (node->resolution == LDPR_PREVAILING_DEF_IRONLY
|| node->resolution == LDPR_PREVAILING_DEF
|| node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP);
/* The linker decisions ought to agree in the whole group. */
if (node->same_comdat_group)
for (symtab_node *next = node->same_comdat_group;
next != node; next = next->same_comdat_group)
gcc_assert (!node->externally_visible
|| define == (next->resolution == LDPR_PREVAILING_DEF_IRONLY
|| next->resolution == LDPR_PREVAILING_DEF
|| next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP));
if (node->same_comdat_group)
for (symtab_node *next = node->same_comdat_group;
next != node; next = next->same_comdat_group)
{
next->set_comdat_group (NULL);
DECL_WEAK (next->decl) = false;
if (next->externally_visible
&& !define)
DECL_EXTERNAL (next->decl) = true;
}
node->set_comdat_group (NULL);
DECL_WEAK (node->decl) = false;
if (!define)
DECL_EXTERNAL (node->decl) = true;
symtab_dissolve_same_comdat_group_list (node);
}
/* Decide on visibility of all symbols. */
static unsigned int
function_and_variable_visibility (bool whole_program)
{
struct cgraph_node *node;
varpool_node *vnode;
/* All aliases should be procssed at this point. */
gcc_checking_assert (!alias_pairs || !alias_pairs->length ());
FOR_EACH_FUNCTION (node)
{
int flags = flags_from_decl_or_type (node->decl);
/* Optimize away PURE and CONST constructors and destructors. */
if (optimize
&& (flags & (ECF_CONST | ECF_PURE))
&& !(flags & ECF_LOOPING_CONST_OR_PURE))
{
DECL_STATIC_CONSTRUCTOR (node->decl) = 0;
DECL_STATIC_DESTRUCTOR (node->decl) = 0;
}
/* Frontends and alias code marks nodes as needed before parsing is finished.
We may end up marking as node external nodes where this flag is meaningless
strip it. */
if (DECL_EXTERNAL (node->decl) || !node->definition)
{
node->force_output = 0;
node->forced_by_abi = 0;
}
/* C++ FE on lack of COMDAT support create local COMDAT functions
(that ought to be shared but can not due to object format
limitations). It is necessary to keep the flag to make rest of C++ FE
happy. Clear the flag here to avoid confusion in middle-end. */
if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl))
DECL_COMDAT (node->decl) = 0;
/* For external decls stop tracking same_comdat_group. It doesn't matter
what comdat group they are in when they won't be emitted in this TU. */
if (node->same_comdat_group && DECL_EXTERNAL (node->decl))
{
#ifdef ENABLE_CHECKING
symtab_node *n;
for (n = node->same_comdat_group;
n != node;
n = n->same_comdat_group)
/* If at least one of same comdat group functions is external,
all of them have to be, otherwise it is a front-end bug. */
gcc_assert (DECL_EXTERNAL (n->decl));
#endif
symtab_dissolve_same_comdat_group_list (node);
}
gcc_assert ((!DECL_WEAK (node->decl)
&& !DECL_COMDAT (node->decl))
|| TREE_PUBLIC (node->decl)
|| node->weakref
|| DECL_EXTERNAL (node->decl));
if (cgraph_externally_visible_p (node, whole_program))
{
gcc_assert (!node->global.inlined_to);
node->externally_visible = true;
}
else
{
node->externally_visible = false;
node->forced_by_abi = false;
}
if (!node->externally_visible
&& node->definition && !node->weakref
&& !DECL_EXTERNAL (node->decl))
{
gcc_assert (whole_program || in_lto_p
|| !TREE_PUBLIC (node->decl));
node->unique_name = ((node->resolution == LDPR_PREVAILING_DEF_IRONLY
|| node->unique_name
|| node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (node->decl));
node->resolution = LDPR_PREVAILING_DEF_IRONLY;
if (node->same_comdat_group && TREE_PUBLIC (node->decl))
{
symtab_node *next = node;
/* Set all members of comdat group local. */
if (node->same_comdat_group)
for (next = node->same_comdat_group;
next != node;
next = next->same_comdat_group)
{
next->set_comdat_group (NULL);
symtab_make_decl_local (next->decl);
next->unique_name = ((next->resolution == LDPR_PREVAILING_DEF_IRONLY
|| next->unique_name
|| next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (next->decl));
}
/* cgraph_externally_visible_p has already checked all other nodes
in the group and they will all be made local. We need to
dissolve the group at once so that the predicate does not
segfault though. */
symtab_dissolve_same_comdat_group_list (node);
}
if (TREE_PUBLIC (node->decl))
node->set_comdat_group (NULL);
symtab_make_decl_local (node->decl);
}
if (node->thunk.thunk_p
&& TREE_PUBLIC (node->decl))
{
struct cgraph_node *decl_node = node;
decl_node = cgraph_function_node (decl_node->callees->callee, NULL);
/* Thunks have the same visibility as function they are attached to.
Make sure the C++ front end set this up properly. */
if (DECL_ONE_ONLY (decl_node->decl))
{
gcc_checking_assert (DECL_COMDAT (node->decl)
== DECL_COMDAT (decl_node->decl));
gcc_checking_assert (symtab_in_same_comdat_p (node, decl_node));
gcc_checking_assert (node->same_comdat_group);
}
node->forced_by_abi = decl_node->forced_by_abi;
if (DECL_EXTERNAL (decl_node->decl))
DECL_EXTERNAL (node->decl) = 1;
}
update_visibility_by_resolution_info (node);
}
FOR_EACH_DEFINED_FUNCTION (node)
{
node->local.local |= cgraph_local_node_p (node);
/* If we know that function can not be overwritten by a different semantics
and moreover its section can not be discarded, replace all direct calls
by calls to an nonoverwritable alias. This make dynamic linking
cheaper and enable more optimization.
TODO: We can also update virtual tables. */
if (node->callers && can_replace_by_local_alias (node))
{
struct cgraph_node *alias = cgraph (symtab_nonoverwritable_alias (node));
if (alias && alias != node)
{
while (node->callers)
{
struct cgraph_edge *e = node->callers;
cgraph_redirect_edge_callee (e, alias);
if (gimple_has_body_p (e->caller->decl))
{
push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl));
cgraph_redirect_edge_call_stmt_to_callee (e);
pop_cfun ();
}
}
}
}
}
FOR_EACH_VARIABLE (vnode)
{
/* weak flag makes no sense on local variables. */
gcc_assert (!DECL_WEAK (vnode->decl)
|| vnode->weakref
|| TREE_PUBLIC (vnode->decl)
|| DECL_EXTERNAL (vnode->decl));
/* In several cases declarations can not be common:
- when declaration has initializer
- when it is in weak
- when it has specific section
- when it resides in non-generic address space.
- if declaration is local, it will get into .local common section
so common flag is not needed. Frontends still produce these in
certain cases, such as for:
static int a __attribute__ ((common))
Canonicalize things here and clear the redundant flag. */
if (DECL_COMMON (vnode->decl)
&& (!(TREE_PUBLIC (vnode->decl)
|| DECL_EXTERNAL (vnode->decl))
|| (DECL_INITIAL (vnode->decl)
&& DECL_INITIAL (vnode->decl) != error_mark_node)
|| DECL_WEAK (vnode->decl)
|| DECL_SECTION_NAME (vnode->decl) != NULL
|| ! (ADDR_SPACE_GENERIC_P
(TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl))))))
DECL_COMMON (vnode->decl) = 0;
}
FOR_EACH_DEFINED_VARIABLE (vnode)
{
if (!vnode->definition)
continue;
if (varpool_externally_visible_p (vnode))
vnode->externally_visible = true;
else
{
vnode->externally_visible = false;
vnode->forced_by_abi = false;
}
if (!vnode->externally_visible
&& !vnode->weakref)
{
gcc_assert (in_lto_p || whole_program || !TREE_PUBLIC (vnode->decl));
vnode->unique_name = ((vnode->resolution == LDPR_PREVAILING_DEF_IRONLY
|| vnode->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (vnode->decl));
if (vnode->same_comdat_group && TREE_PUBLIC (vnode->decl))
{
symtab_node *next = vnode;
/* Set all members of comdat group local. */
if (vnode->same_comdat_group)
for (next = vnode->same_comdat_group;
next != vnode;
next = next->same_comdat_group)
{
next->set_comdat_group (NULL);
symtab_make_decl_local (next->decl);
next->unique_name = ((next->resolution == LDPR_PREVAILING_DEF_IRONLY
|| next->unique_name
|| next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (next->decl));
}
symtab_dissolve_same_comdat_group_list (vnode);
}
if (TREE_PUBLIC (vnode->decl))
vnode->set_comdat_group (NULL);
symtab_make_decl_local (vnode->decl);
vnode->resolution = LDPR_PREVAILING_DEF_IRONLY;
}
update_visibility_by_resolution_info (vnode);
}
if (dump_file)
{
fprintf (dump_file, "\nMarking local functions:");
FOR_EACH_DEFINED_FUNCTION (node)
if (node->local.local)
fprintf (dump_file, " %s", node->name ());
fprintf (dump_file, "\n\n");
fprintf (dump_file, "\nMarking externally visible functions:");
FOR_EACH_DEFINED_FUNCTION (node)
if (node->externally_visible)
fprintf (dump_file, " %s", node->name ());
fprintf (dump_file, "\n\n");
fprintf (dump_file, "\nMarking externally visible variables:");
FOR_EACH_DEFINED_VARIABLE (vnode)
if (vnode->externally_visible)
fprintf (dump_file, " %s", vnode->name ());
fprintf (dump_file, "\n\n");
}
cgraph_function_flags_ready = true;
return 0;
}
/* Local function pass handling visibilities. This happens before LTO streaming
so in particular -fwhole-program should be ignored at this level. */
namespace {
const pass_data pass_data_ipa_function_and_variable_visibility =
{
SIMPLE_IPA_PASS, /* type */
"visibility", /* name */
OPTGROUP_NONE, /* optinfo_flags */
true, /* has_execute */
TV_CGRAPHOPT, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */
};
/* Bring functions local at LTO time with -fwhole-program. */
static unsigned int
whole_program_function_and_variable_visibility (void)
{
function_and_variable_visibility (flag_whole_program);
if (optimize)
ipa_discover_readonly_nonaddressable_vars ();
return 0;
}
} // anon namespace
namespace {
const pass_data pass_data_ipa_whole_program_visibility =
{
IPA_PASS, /* type */
"whole-program", /* name */
OPTGROUP_NONE, /* optinfo_flags */
true, /* has_execute */
TV_CGRAPHOPT, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */
};
class pass_ipa_whole_program_visibility : public ipa_opt_pass_d
{
public:
pass_ipa_whole_program_visibility (gcc::context *ctxt)
: ipa_opt_pass_d (pass_data_ipa_whole_program_visibility, ctxt,
NULL, /* generate_summary */
NULL, /* write_summary */
NULL, /* read_summary */
NULL, /* write_optimization_summary */
NULL, /* read_optimization_summary */
NULL, /* stmt_fixup */
0, /* function_transform_todo_flags_start */
NULL, /* function_transform */
NULL) /* variable_transform */
{}
/* opt_pass methods: */
virtual bool gate (function *)
{
/* Do not re-run on ltrans stage. */
return !flag_ltrans;
}
virtual unsigned int execute (function *)
{
return whole_program_function_and_variable_visibility ();
}
}; // class pass_ipa_whole_program_visibility
} // anon namespace
ipa_opt_pass_d *
make_pass_ipa_whole_program_visibility (gcc::context *ctxt)
{
return new pass_ipa_whole_program_visibility (ctxt);
}
class pass_ipa_function_and_variable_visibility : public simple_ipa_opt_pass
{
public:
pass_ipa_function_and_variable_visibility (gcc::context *ctxt)
: simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility,
ctxt)
{}
/* opt_pass methods: */
virtual unsigned int execute (function *)
{
return function_and_variable_visibility (flag_whole_program && !flag_lto);
}
}; // class pass_ipa_function_and_variable_visibility
simple_ipa_opt_pass *
make_pass_ipa_function_and_variable_visibility (gcc::context *ctxt)
{
return new pass_ipa_function_and_variable_visibility (ctxt);
}

682
gcc/ipa.c

@ -42,36 +42,6 @@ along with GCC; see the file COPYING3. If not see
#include "gimple.h"
#include "dbgcnt.h"
/* Return true when NODE can not be local. Worker for cgraph_local_node_p. */
static bool
cgraph_non_local_node_p_1 (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
{
/* FIXME: Aliases can be local, but i386 gets thunks wrong then. */
return !(cgraph_only_called_directly_or_aliased_p (node)
&& !ipa_ref_has_aliases_p (&node->ref_list)
&& node->definition
&& !DECL_EXTERNAL (node->decl)
&& !node->externally_visible
&& !node->used_from_other_partition
&& !node->in_other_partition);
}
/* Return true when function can be marked local. */
static bool
cgraph_local_node_p (struct cgraph_node *node)
{
struct cgraph_node *n = cgraph_function_or_thunk_node (node, NULL);
/* FIXME: thunks can be considered local, but we need prevent i386
from attempting to change calling convention of them. */
if (n->thunk.thunk_p)
return false;
return !cgraph_for_node_and_aliases (n,
cgraph_non_local_node_p_1, NULL, true);
}
/* Return true when NODE has ADDR reference. */
@ -761,593 +731,6 @@ ipa_discover_readonly_nonaddressable_vars (void)
fprintf (dump_file, "\n");
}
/* Return true when there is a reference to node and it is not vtable. */
static bool
address_taken_from_non_vtable_p (symtab_node *node)
{
int i;
struct ipa_ref *ref;
for (i = 0; ipa_ref_list_referring_iterate (&node->ref_list,
i, ref); i++)
if (ref->use == IPA_REF_ADDR)
{
varpool_node *node;
if (is_a <cgraph_node *> (ref->referring))
return true;
node = ipa_ref_referring_varpool_node (ref);
if (!DECL_VIRTUAL_P (node->decl))
return true;
}
return false;
}
/* A helper for comdat_can_be_unshared_p. */
static bool
comdat_can_be_unshared_p_1 (symtab_node *node)
{
if (!node->externally_visible)
return true;
/* When address is taken, we don't know if equality comparison won't
break eventually. Exception are virutal functions, C++
constructors/destructors and vtables, where this is not possible by
language standard. */
if (!DECL_VIRTUAL_P (node->decl)
&& (TREE_CODE (node->decl) != FUNCTION_DECL
|| (!DECL_CXX_CONSTRUCTOR_P (node->decl)
&& !DECL_CXX_DESTRUCTOR_P (node->decl)))
&& address_taken_from_non_vtable_p (node))
return false;
/* If the symbol is used in some weird way, better to not touch it. */
if (node->force_output)
return false;
/* Explicit instantiations needs to be output when possibly
used externally. */
if (node->forced_by_abi
&& TREE_PUBLIC (node->decl)
&& (node->resolution != LDPR_PREVAILING_DEF_IRONLY
&& !flag_whole_program))
return false;
/* Non-readonly and volatile variables can not be duplicated. */
if (is_a <varpool_node *> (node)
&& (!TREE_READONLY (node->decl)
|| TREE_THIS_VOLATILE (node->decl)))
return false;
return true;
}
/* COMDAT functions must be shared only if they have address taken,
otherwise we can produce our own private implementation with
-fwhole-program.
Return true when turning COMDAT functoin static can not lead to wrong
code when the resulting object links with a library defining same COMDAT.
Virtual functions do have their addresses taken from the vtables,
but in C++ there is no way to compare their addresses for equality. */
static bool
comdat_can_be_unshared_p (symtab_node *node)
{
if (!comdat_can_be_unshared_p_1 (node))
return false;
if (node->same_comdat_group)
{
symtab_node *next;
/* If more than one function is in the same COMDAT group, it must
be shared even if just one function in the comdat group has
address taken. */
for (next = node->same_comdat_group;
next != node; next = next->same_comdat_group)
if (!comdat_can_be_unshared_p_1 (next))
return false;
}
return true;
}
/* Return true when function NODE should be considered externally visible. */
static bool
cgraph_externally_visible_p (struct cgraph_node *node,
bool whole_program)
{
if (!node->definition)
return false;
if (!TREE_PUBLIC (node->decl)
|| DECL_EXTERNAL (node->decl))
return false;
/* Do not try to localize built-in functions yet. One of problems is that we
end up mangling their asm for WHOPR that makes it impossible to call them
using the implicit built-in declarations anymore. Similarly this enables
us to remove them as unreachable before actual calls may appear during
expansion or folding. */
if (DECL_BUILT_IN (node->decl))
return true;
/* If linker counts on us, we must preserve the function. */
if (symtab_used_from_object_file_p (node))
return true;
if (DECL_PRESERVE_P (node->decl))
return true;
if (lookup_attribute ("externally_visible",
DECL_ATTRIBUTES (node->decl)))
return true;
if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
&& lookup_attribute ("dllexport",
DECL_ATTRIBUTES (node->decl)))
return true;
if (node->resolution == LDPR_PREVAILING_DEF_IRONLY)
return false;
/* When doing LTO or whole program, we can bring COMDAT functoins static.
This improves code quality and we know we will duplicate them at most twice
(in the case that we are not using plugin and link with object file
implementing same COMDAT) */
if ((in_lto_p || whole_program)
&& DECL_COMDAT (node->decl)
&& comdat_can_be_unshared_p (node))
return false;
/* When doing link time optimizations, hidden symbols become local. */
if (in_lto_p
&& (DECL_VISIBILITY (node->decl) == VISIBILITY_HIDDEN
|| DECL_VISIBILITY (node->decl) == VISIBILITY_INTERNAL)
/* Be sure that node is defined in IR file, not in other object
file. In that case we don't set used_from_other_object_file. */
&& node->definition)
;
else if (!whole_program)
return true;
if (MAIN_NAME_P (DECL_NAME (node->decl)))
return true;
return false;
}
/* Return true when variable VNODE should be considered externally visible. */
bool
varpool_externally_visible_p (varpool_node *vnode)
{
if (DECL_EXTERNAL (vnode->decl))
return true;
if (!TREE_PUBLIC (vnode->decl))
return false;
/* If linker counts on us, we must preserve the function. */
if (symtab_used_from_object_file_p (vnode))
return true;
if (DECL_HARD_REGISTER (vnode->decl))
return true;
if (DECL_PRESERVE_P (vnode->decl))
return true;
if (lookup_attribute ("externally_visible",
DECL_ATTRIBUTES (vnode->decl)))
return true;
if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
&& lookup_attribute ("dllexport",
DECL_ATTRIBUTES (vnode->decl)))
return true;
/* See if we have linker information about symbol not being used or
if we need to make guess based on the declaration.
Even if the linker clams the symbol is unused, never bring internal
symbols that are declared by user as used or externally visible.
This is needed for i.e. references from asm statements. */
if (symtab_used_from_object_file_p (vnode))
return true;
if (vnode->resolution == LDPR_PREVAILING_DEF_IRONLY)
return false;
/* As a special case, the COMDAT virtual tables can be unshared.
In LTO mode turn vtables into static variables. The variable is readonly,
so this does not enable more optimization, but referring static var
is faster for dynamic linking. Also this match logic hidding vtables
from LTO symbol tables. */
if ((in_lto_p || flag_whole_program)
&& DECL_COMDAT (vnode->decl)
&& comdat_can_be_unshared_p (vnode))
return false;
/* When doing link time optimizations, hidden symbols become local. */
if (in_lto_p
&& (DECL_VISIBILITY (vnode->decl) == VISIBILITY_HIDDEN
|| DECL_VISIBILITY (vnode->decl) == VISIBILITY_INTERNAL)
/* Be sure that node is defined in IR file, not in other object
file. In that case we don't set used_from_other_object_file. */
&& vnode->definition)
;
else if (!flag_whole_program)
return true;
/* Do not attempt to privatize COMDATS by default.
This would break linking with C++ libraries sharing
inline definitions.
FIXME: We can do so for readonly vars with no address taken and
possibly also for vtables since no direct pointer comparsion is done.
It might be interesting to do so to reduce linking overhead. */
if (DECL_COMDAT (vnode->decl) || DECL_WEAK (vnode->decl))
return true;
return false;
}
/* Return true if reference to NODE can be replaced by a local alias.
Local aliases save dynamic linking overhead and enable more optimizations.
*/
bool
can_replace_by_local_alias (symtab_node *node)
{
return (symtab_node_availability (node) > AVAIL_OVERWRITABLE
&& !symtab_can_be_discarded (node));
}
/* In LTO we can remove COMDAT groups and weak symbols.
Either turn them into normal symbols or external symbol depending on
resolution info. */
static void
update_visibility_by_resolution_info (symtab_node * node)
{
bool define;
if (!node->externally_visible
|| (!DECL_WEAK (node->decl) && !DECL_ONE_ONLY (node->decl))
|| node->resolution == LDPR_UNKNOWN)
return;
define = (node->resolution == LDPR_PREVAILING_DEF_IRONLY
|| node->resolution == LDPR_PREVAILING_DEF
|| node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP);
/* The linker decisions ought to agree in the whole group. */
if (node->same_comdat_group)
for (symtab_node *next = node->same_comdat_group;
next != node; next = next->same_comdat_group)
gcc_assert (!node->externally_visible
|| define == (next->resolution == LDPR_PREVAILING_DEF_IRONLY
|| next->resolution == LDPR_PREVAILING_DEF
|| next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP));
if (node->same_comdat_group)
for (symtab_node *next = node->same_comdat_group;
next != node; next = next->same_comdat_group)
{
next->set_comdat_group (NULL);
DECL_WEAK (next->decl) = false;
if (next->externally_visible
&& !define)
DECL_EXTERNAL (next->decl) = true;
}
node->set_comdat_group (NULL);
DECL_WEAK (node->decl) = false;
if (!define)
DECL_EXTERNAL (node->decl) = true;
symtab_dissolve_same_comdat_group_list (node);
}
/* Mark visibility of all functions.
A local function is one whose calls can occur only in the current
compilation unit and all its calls are explicit, so we can change
its calling convention. We simply mark all static functions whose
address is not taken as local.
We also change the TREE_PUBLIC flag of all declarations that are public
in language point of view but we want to overwrite this default
via visibilities for the backend point of view. */
static unsigned int
function_and_variable_visibility (bool whole_program)
{
struct cgraph_node *node;
varpool_node *vnode;
/* All aliases should be procssed at this point. */
gcc_checking_assert (!alias_pairs || !alias_pairs->length ());
FOR_EACH_FUNCTION (node)
{
int flags = flags_from_decl_or_type (node->decl);
/* Optimize away PURE and CONST constructors and destructors. */
if (optimize
&& (flags & (ECF_CONST | ECF_PURE))
&& !(flags & ECF_LOOPING_CONST_OR_PURE))
{
DECL_STATIC_CONSTRUCTOR (node->decl) = 0;
DECL_STATIC_DESTRUCTOR (node->decl) = 0;
}
/* Frontends and alias code marks nodes as needed before parsing is finished.
We may end up marking as node external nodes where this flag is meaningless
strip it. */
if (DECL_EXTERNAL (node->decl) || !node->definition)
{
node->force_output = 0;
node->forced_by_abi = 0;
}
/* C++ FE on lack of COMDAT support create local COMDAT functions
(that ought to be shared but can not due to object format
limitations). It is necessary to keep the flag to make rest of C++ FE
happy. Clear the flag here to avoid confusion in middle-end. */
if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl))
DECL_COMDAT (node->decl) = 0;
/* For external decls stop tracking same_comdat_group. It doesn't matter
what comdat group they are in when they won't be emitted in this TU. */
if (node->same_comdat_group && DECL_EXTERNAL (node->decl))
{
#ifdef ENABLE_CHECKING
symtab_node *n;
for (n = node->same_comdat_group;
n != node;
n = n->same_comdat_group)
/* If at least one of same comdat group functions is external,
all of them have to be, otherwise it is a front-end bug. */
gcc_assert (DECL_EXTERNAL (n->decl));
#endif
symtab_dissolve_same_comdat_group_list (node);
}
gcc_assert ((!DECL_WEAK (node->decl)
&& !DECL_COMDAT (node->decl))
|| TREE_PUBLIC (node->decl)
|| node->weakref
|| DECL_EXTERNAL (node->decl));
if (cgraph_externally_visible_p (node, whole_program))
{
gcc_assert (!node->global.inlined_to);
node->externally_visible = true;
}
else
{
node->externally_visible = false;
node->forced_by_abi = false;
}
if (!node->externally_visible
&& node->definition && !node->weakref
&& !DECL_EXTERNAL (node->decl))
{
gcc_assert (whole_program || in_lto_p
|| !TREE_PUBLIC (node->decl));
node->unique_name = ((node->resolution == LDPR_PREVAILING_DEF_IRONLY
|| node->unique_name
|| node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (node->decl));
node->resolution = LDPR_PREVAILING_DEF_IRONLY;
if (node->same_comdat_group && TREE_PUBLIC (node->decl))
{
symtab_node *next = node;
/* Set all members of comdat group local. */
if (node->same_comdat_group)
for (next = node->same_comdat_group;
next != node;
next = next->same_comdat_group)
{
next->set_comdat_group (NULL);
symtab_make_decl_local (next->decl);
next->unique_name = ((next->resolution == LDPR_PREVAILING_DEF_IRONLY
|| next->unique_name
|| next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (next->decl));
}
/* cgraph_externally_visible_p has already checked all other nodes
in the group and they will all be made local. We need to
dissolve the group at once so that the predicate does not
segfault though. */
symtab_dissolve_same_comdat_group_list (node);
}
if (TREE_PUBLIC (node->decl))
node->set_comdat_group (NULL);
symtab_make_decl_local (node->decl);
}
if (node->thunk.thunk_p
&& TREE_PUBLIC (node->decl))
{
struct cgraph_node *decl_node = node;
decl_node = cgraph_function_node (decl_node->callees->callee, NULL);
/* Thunks have the same visibility as function they are attached to.
Make sure the C++ front end set this up properly. */
if (DECL_ONE_ONLY (decl_node->decl))
{
gcc_checking_assert (DECL_COMDAT (node->decl)
== DECL_COMDAT (decl_node->decl));
gcc_checking_assert (symtab_in_same_comdat_p (node, decl_node));
gcc_checking_assert (node->same_comdat_group);
}
node->forced_by_abi = decl_node->forced_by_abi;
if (DECL_EXTERNAL (decl_node->decl))
DECL_EXTERNAL (node->decl) = 1;
}
update_visibility_by_resolution_info (node);
}
FOR_EACH_DEFINED_FUNCTION (node)
{
node->local.local |= cgraph_local_node_p (node);
/* If we know that function can not be overwritten by a different semantics
and moreover its section can not be discarded, replace all direct calls
by calls to an nonoverwritable alias. This make dynamic linking
cheaper and enable more optimization.
TODO: We can also update virtual tables. */
if (node->callers && can_replace_by_local_alias (node))
{
struct cgraph_node *alias = cgraph (symtab_nonoverwritable_alias (node));
if (alias && alias != node)
{
while (node->callers)
{
struct cgraph_edge *e = node->callers;
cgraph_redirect_edge_callee (e, alias);
if (gimple_has_body_p (e->caller->decl))
{
push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl));
cgraph_redirect_edge_call_stmt_to_callee (e);
pop_cfun ();
}
}
}
}
}
FOR_EACH_VARIABLE (vnode)
{
/* weak flag makes no sense on local variables. */
gcc_assert (!DECL_WEAK (vnode->decl)
|| vnode->weakref
|| TREE_PUBLIC (vnode->decl)
|| DECL_EXTERNAL (vnode->decl));
/* In several cases declarations can not be common:
- when declaration has initializer
- when it is in weak
- when it has specific section
- when it resides in non-generic address space.
- if declaration is local, it will get into .local common section
so common flag is not needed. Frontends still produce these in
certain cases, such as for:
static int a __attribute__ ((common))
Canonicalize things here and clear the redundant flag. */
if (DECL_COMMON (vnode->decl)
&& (!(TREE_PUBLIC (vnode->decl)
|| DECL_EXTERNAL (vnode->decl))
|| (DECL_INITIAL (vnode->decl)
&& DECL_INITIAL (vnode->decl) != error_mark_node)
|| DECL_WEAK (vnode->decl)
|| DECL_SECTION_NAME (vnode->decl) != NULL
|| ! (ADDR_SPACE_GENERIC_P
(TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl))))))
DECL_COMMON (vnode->decl) = 0;
}
FOR_EACH_DEFINED_VARIABLE (vnode)
{
if (!vnode->definition)
continue;
if (varpool_externally_visible_p (vnode))
vnode->externally_visible = true;
else
{
vnode->externally_visible = false;
vnode->forced_by_abi = false;
}
if (!vnode->externally_visible
&& !vnode->weakref)
{
gcc_assert (in_lto_p || whole_program || !TREE_PUBLIC (vnode->decl));
vnode->unique_name = ((vnode->resolution == LDPR_PREVAILING_DEF_IRONLY
|| vnode->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (vnode->decl));
if (vnode->same_comdat_group && TREE_PUBLIC (vnode->decl))
{
symtab_node *next = vnode;
/* Set all members of comdat group local. */
if (vnode->same_comdat_group)
for (next = vnode->same_comdat_group;
next != vnode;
next = next->same_comdat_group)
{
next->set_comdat_group (NULL);
symtab_make_decl_local (next->decl);
next->unique_name = ((next->resolution == LDPR_PREVAILING_DEF_IRONLY
|| next->unique_name
|| next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
&& TREE_PUBLIC (next->decl));
}
symtab_dissolve_same_comdat_group_list (vnode);
}
if (TREE_PUBLIC (vnode->decl))
vnode->set_comdat_group (NULL);
symtab_make_decl_local (vnode->decl);
vnode->resolution = LDPR_PREVAILING_DEF_IRONLY;
}
update_visibility_by_resolution_info (vnode);
}
if (dump_file)
{
fprintf (dump_file, "\nMarking local functions:");
FOR_EACH_DEFINED_FUNCTION (node)
if (node->local.local)
fprintf (dump_file, " %s", node->name ());
fprintf (dump_file, "\n\n");
fprintf (dump_file, "\nMarking externally visible functions:");
FOR_EACH_DEFINED_FUNCTION (node)
if (node->externally_visible)
fprintf (dump_file, " %s", node->name ());
fprintf (dump_file, "\n\n");
fprintf (dump_file, "\nMarking externally visible variables:");
FOR_EACH_DEFINED_VARIABLE (vnode)
if (vnode->externally_visible)
fprintf (dump_file, " %s", vnode->name ());
fprintf (dump_file, "\n\n");
}
cgraph_function_flags_ready = true;
return 0;
}
/* Local function pass handling visibilities. This happens before LTO streaming
so in particular -fwhole-program should be ignored at this level. */
namespace {
const pass_data pass_data_ipa_function_and_variable_visibility =
{
SIMPLE_IPA_PASS, /* type */
"visibility", /* name */
OPTGROUP_NONE, /* optinfo_flags */
true, /* has_execute */
TV_CGRAPHOPT, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */
};
class pass_ipa_function_and_variable_visibility : public simple_ipa_opt_pass
{
public:
pass_ipa_function_and_variable_visibility (gcc::context *ctxt)
: simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility,
ctxt)
{}
/* opt_pass methods: */
virtual unsigned int execute (function *)
{
return function_and_variable_visibility (flag_whole_program && !flag_lto);
}
}; // class pass_ipa_function_and_variable_visibility
} // anon namespace
simple_ipa_opt_pass *
make_pass_ipa_function_and_variable_visibility (gcc::context *ctxt)
{
return new pass_ipa_function_and_variable_visibility (ctxt);
}
/* Free inline summary. */
namespace {
@ -1390,71 +773,6 @@ make_pass_ipa_free_inline_summary (gcc::context *ctxt)
return new pass_ipa_free_inline_summary (ctxt);
}
/* Bring functionss local at LTO time with -fwhole-program. */
static unsigned int
whole_program_function_and_variable_visibility (void)
{
function_and_variable_visibility (flag_whole_program);
if (optimize)
ipa_discover_readonly_nonaddressable_vars ();
return 0;
}
namespace {
const pass_data pass_data_ipa_whole_program_visibility =
{
IPA_PASS, /* type */
"whole-program", /* name */
OPTGROUP_NONE, /* optinfo_flags */
true, /* has_execute */
TV_CGRAPHOPT, /* tv_id */
0, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */
};
class pass_ipa_whole_program_visibility : public ipa_opt_pass_d
{
public:
pass_ipa_whole_program_visibility (gcc::context *ctxt)
: ipa_opt_pass_d (pass_data_ipa_whole_program_visibility, ctxt,
NULL, /* generate_summary */
NULL, /* write_summary */
NULL, /* read_summary */
NULL, /* write_optimization_summary */
NULL, /* read_optimization_summary */
NULL, /* stmt_fixup */
0, /* function_transform_todo_flags_start */
NULL, /* function_transform */
NULL) /* variable_transform */
{}
/* opt_pass methods: */
virtual bool gate (function *)
{
/* Do not re-run on ltrans stage. */
return !flag_ltrans;
}
virtual unsigned int execute (function *)
{
return whole_program_function_and_variable_visibility ();
}
}; // class pass_ipa_whole_program_visibility
} // anon namespace
ipa_opt_pass_d *
make_pass_ipa_whole_program_visibility (gcc::context *ctxt)
{
return new pass_ipa_whole_program_visibility (ctxt);
}
/* Generate and emit a static constructor or destructor. WHICH must
be one of 'I' (for a constructor) or 'D' (for a destructor). BODY
is a STATEMENT_LIST containing GENERIC statements. PRIORITY is the