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Add plugin API for processing plugin-added input files

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Gold plugins may wish to further process an input file added by a plugin. For
example, the plugin may need to assign a unique segment for sections in a
plugin-generated input file. This patch adds a plugin callback that the linker
will call when reading symbols from a new input file added after the
all_symbols_read event (i.e. an input file added by a plugin).

2017-12-11  Stephen Crane  <sjc@immunant.com>

	* plugin-api.h: Add new plugin hook to allow processing of input
	files added by a plugin.
	(ld_plugin_new_input_handler): New function hook type.
	(ld_plugin_register_new_input): New interface.
	(LDPT_REGISTER_NEW_INPUT_HOOK): New enum val.
	(tv_register_new_input): New member.

	* plugin.cc (Plugin::load): Include hooks for register_new_input
	in transfer vector.
	(Plugin::new_input): New function.
	(register_new_input): New function.
	(Plugin_manager::claim_file): Call Plugin::new_input if in
	replacement phase.
	* plugin.h (Plugin::set_new_input_handler): New function.
	* testsuite/plugin_new_section_layout.c: New plugin to test
	new_input plugin API.
	* testsuite/plugin_final_layout.sh: Add new input test.
	* testsuite/Makefile.am (plugin_layout_new_file): New test case.
	* testsuite/Makefile.in: Regenerate.
This commit is contained in:
Stephen Crane 2017-12-11 14:58:38 -08:00 committed by Sriraman Tallam
parent 4c5ae11b42
commit c4e648430f
9 changed files with 333 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
gold/ChangeLog
View File

@ -1,3 +1,18 @@
2017-12-11 Stephen Crane <sjc@immunant.com>
* plugin.cc (Plugin::load): Include hooks for register_new_input
in transfer vector.
(Plugin::new_input): New function.
(register_new_input): New function.
(Plugin_manager::claim_file): Call Plugin::new_input if in
replacement phase.
* plugin.h (Plugin::set_new_input_handler): New function.
* testsuite/plugin_new_section_layout.c: New plugin to test
new_input plugin API.
* testsuite/plugin_final_layout.sh: Add new input test.
* testsuite/Makefile.am (plugin_layout_new_file): New test case.
* testsuite/Makefile.in: Regenerate.
2017-12-02 Vladimir Kondratyev <vladimir@kondratyev.su>
Cary Coutant <ccoutant@gmail.com>

59
gold/plugin.cc
View File

@ -167,6 +167,9 @@ static enum ld_plugin_status
get_input_section_size(const struct ld_plugin_section section,
uint64_t* secsize);
static enum ld_plugin_status
register_new_input(ld_plugin_new_input_handler handler);
};
#endif // ENABLE_PLUGINS
@ -211,7 +214,7 @@ Plugin::load()
sscanf(ver, "%d.%d", &major, &minor);
// Allocate and populate a transfer vector.
const int tv_fixed_size = 29;
const int tv_fixed_size = 30;
int tv_size = this->args_.size() + tv_fixed_size;
ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
@ -345,6 +348,10 @@ Plugin::load()
tv[i].tv_tag = LDPT_GET_INPUT_SECTION_SIZE;
tv[i].tv_u.tv_get_input_section_size = get_input_section_size;
++i;
tv[i].tv_tag = LDPT_REGISTER_NEW_INPUT_HOOK;
tv[i].tv_u.tv_register_new_input = register_new_input;
++i;
tv[i].tv_tag = LDPT_NULL;
tv[i].tv_u.tv_val = 0;
@ -383,6 +390,15 @@ Plugin::all_symbols_read()
(*this->all_symbols_read_handler_)();
}
// Call the new_input handler.
inline void
Plugin::new_input(struct ld_plugin_input_file* plugin_input_file)
{
if (this->new_input_handler_ != NULL)
(*this->new_input_handler_)(plugin_input_file);
}
// Call the cleanup handler.
inline void
@ -476,8 +492,6 @@ Plugin_manager::claim_file(Input_file* input_file, off_t offset,
gold_assert(lock_initialized);
Hold_lock hl(*this->lock_);
if (this->in_replacement_phase_)
return NULL;
unsigned int handle = this->objects_.size();
this->input_file_ = input_file;
@ -494,19 +508,28 @@ Plugin_manager::claim_file(Input_file* input_file, off_t offset,
this->current_ != this->plugins_.end();
++this->current_)
{
if ((*this->current_)->claim_file(&this->plugin_input_file_))
// If we aren't yet in replacement phase, allow plugins to claim input
// files, otherwise notify the plugin of the new input file, if needed.
if (!this->in_replacement_phase_)
{
this->any_claimed_ = true;
this->in_claim_file_handler_ = false;
if ((*this->current_)->claim_file(&this->plugin_input_file_))
{
this->any_claimed_ = true;
this->in_claim_file_handler_ = false;
if (this->objects_.size() > handle
&& this->objects_[handle]->pluginobj() != NULL)
return this->objects_[handle]->pluginobj();
if (this->objects_.size() > handle
&& this->objects_[handle]->pluginobj() != NULL)
return this->objects_[handle]->pluginobj();
// If the plugin claimed the file but did not call the
// add_symbols callback, we need to create the Pluginobj now.
Pluginobj* obj = this->make_plugin_object(handle);
return obj;
// If the plugin claimed the file but did not call the
// add_symbols callback, we need to create the Pluginobj now.
Pluginobj* obj = this->make_plugin_object(handle);
return obj;
}
}
else
{
(*this->current_)->new_input(&this->plugin_input_file_);
}
}
@ -1905,6 +1928,16 @@ unique_segment_for_sections(const char* segment_name,
return LDPS_OK;
}
// Register a new_input handler.
static enum ld_plugin_status
register_new_input(ld_plugin_new_input_handler handler)
{
gold_assert(parameters->options().has_plugins());
parameters->options().plugins()->set_new_input_handler(handler);
return LDPS_OK;
}
#endif // ENABLE_PLUGINS
// Allocate a Pluginobj object of the appropriate size and endianness.

19
gold/plugin.h
View File

@ -60,6 +60,7 @@ class Plugin
claim_file_handler_(NULL),
all_symbols_read_handler_(NULL),
cleanup_handler_(NULL),
new_input_handler_(NULL),
cleanup_done_(false)
{ }
@ -78,6 +79,10 @@ class Plugin
void
all_symbols_read();
// Call the new_input handler.
void
new_input(struct ld_plugin_input_file* plugin_input_file);
// Call the cleanup handler.
void
cleanup();
@ -97,6 +102,11 @@ class Plugin
set_cleanup_handler(ld_plugin_cleanup_handler handler)
{ this->cleanup_handler_ = handler; }
// Register a new_input handler.
void
set_new_input_handler(ld_plugin_new_input_handler handler)
{ this->new_input_handler_ = handler; }
// Add an argument
void
add_option(const char* arg)
@ -118,6 +128,7 @@ class Plugin
ld_plugin_claim_file_handler claim_file_handler_;
ld_plugin_all_symbols_read_handler all_symbols_read_handler_;
ld_plugin_cleanup_handler cleanup_handler_;
ld_plugin_new_input_handler new_input_handler_;
// TRUE if the cleanup handlers have been called.
bool cleanup_done_;
};
@ -218,6 +229,14 @@ class Plugin_manager
(*this->current_)->set_all_symbols_read_handler(handler);
}
// Register a new_input handler.
void
set_new_input_handler(ld_plugin_new_input_handler handler)
{
gold_assert(this->current_ != plugins_.end());
(*this->current_)->set_new_input_handler(handler);
}
// Register a claim-file handler.
void
set_cleanup_handler(ld_plugin_cleanup_handler handler)

17
gold/testsuite/Makefile.am
View File

@ -2401,6 +2401,23 @@ plugin_section_order.so: plugin_section_order.o gcctestdir/ld
plugin_section_order.o: plugin_section_order.c
$(COMPILE) -O0 -c -fpic -o $@ $<
# Uses the plugin_final_layout.sh script above to avoid duplication
check_DATA += plugin_layout_new_file.stdout plugin_layout_new_file_readelf.stdout
MOSTLYCLEANFILES += plugin_layout_new_file
plugin_final_layout.o.syms: plugin_final_layout.o
$(TEST_READELF) -sW $< >$@ 2>/dev/null
plugin_layout_new_file: plugin_final_layout.o.syms plugin_test.so plugin_new_section_layout.so gcctestdir/ld
$(CXXLINK) -Bgcctestdir/ -Wl,--plugin,"./plugin_test.so" -Wl,--plugin,"./plugin_new_section_layout.so" plugin_final_layout.o.syms
plugin_layout_new_file.stdout: plugin_layout_new_file
$(TEST_NM) -n --synthetic plugin_layout_new_file > plugin_layout_new_file.stdout
plugin_layout_new_file_readelf.stdout: plugin_layout_new_file
$(TEST_READELF) -Wl plugin_layout_new_file > plugin_layout_new_file_readelf.stdout
plugin_new_section_layout.so: plugin_new_section_layout.o gcctestdir/ld
$(LINK) -Bgcctestdir/ -shared plugin_new_section_layout.o
plugin_new_section_layout.o: plugin_new_section_layout.c
$(COMPILE) -O0 -c -fpic -o $@ $<
check_SCRIPTS += plugin_layout_with_alignment.sh
check_DATA += plugin_layout_with_alignment.stdout
MOSTLYCLEANFILES += plugin_layout_with_alignment

18
gold/testsuite/Makefile.in
View File

@ -590,11 +590,16 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@@TLS_TRUE@am__append_51 = plugin_test_tls.err
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_52 = unused.c \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_final_layout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_new_file \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_with_alignment
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_53 = plugin_final_layout.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_with_alignment.sh
# Uses the plugin_final_layout.sh script above to avoid duplication
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@am__append_54 = plugin_final_layout.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_final_layout_readelf.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_new_file.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_new_file_readelf.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ plugin_layout_with_alignment.stdout
@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_55 = exclude_libs_test \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ local_labels_test \
@ -7057,6 +7062,19 @@ uninstall-am:
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(LINK) -Bgcctestdir/ -shared plugin_section_order.o
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_section_order.o: plugin_section_order.c
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(COMPILE) -O0 -c -fpic -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_final_layout.o.syms: plugin_final_layout.o
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(TEST_READELF) -sW $< >$@ 2>/dev/null
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_new_file: plugin_final_layout.o.syms plugin_test.so plugin_new_section_layout.so gcctestdir/ld
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(CXXLINK) -Bgcctestdir/ -Wl,--plugin,"./plugin_test.so" -Wl,--plugin,"./plugin_new_section_layout.so" plugin_final_layout.o.syms
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_new_file.stdout: plugin_layout_new_file
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(TEST_NM) -n --synthetic plugin_layout_new_file > plugin_layout_new_file.stdout
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_new_file_readelf.stdout: plugin_layout_new_file
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(TEST_READELF) -Wl plugin_layout_new_file > plugin_layout_new_file_readelf.stdout
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_new_section_layout.so: plugin_new_section_layout.o gcctestdir/ld
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(LINK) -Bgcctestdir/ -shared plugin_new_section_layout.o
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_new_section_layout.o: plugin_new_section_layout.c
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(COMPILE) -O0 -c -fpic -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_with_alignment.o: plugin_layout_with_alignment.c
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@ $(COMPILE) -O0 -c -ffunction-sections -fdata-sections -g -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@@PLUGINS_TRUE@plugin_layout_with_alignment: plugin_layout_with_alignment.o plugin_section_alignment.so gcctestdir/ld

16
gold/testsuite/plugin_final_layout.sh
View File

@ -23,7 +23,7 @@
# MA 02110-1301, USA.
# The goal of this program is to verify if --section-ordering-file works as
# intended. File final_layout.cc is in this test.
# intended. File plugin_final_layout.cc is in this test.
set -e
@ -37,7 +37,7 @@ BEGIN { saw1 = 0; saw2 = 0; err = 0; }
saw2 = 1;
if (!saw1)
{
printf \"layout of $2 and $3 is not right\\n\";
printf \"layout of $2 and $3 is not right in file $1\\n\";
err = 1;
exit 1;
}
@ -45,12 +45,12 @@ BEGIN { saw1 = 0; saw2 = 0; err = 0; }
END {
if (!saw1 && !err)
{
printf \"did not see $2\\n\";
printf \"did not see $2 in file $1\\n\";
exit 1;
}
if (!saw2 && !err)
{
printf \"did not see $3\\n\";
printf \"did not see $3 in file $1\\n\";
exit 1;
}
}" $1
@ -74,12 +74,12 @@ BEGIN { saw_section = 0; saw_unique = 0; }
END {
if (!saw_section)
{
printf \"Section $2 not seen in output\\n\";
printf \"Section $2 not seen in output file $1\\n\";
exit 1;
}
else if (!saw_unique)
{
printf \"Unique segment not seen for: $2\\n\";
printf \"Unique segment not seen for: $2 in file $1\\n\";
exit 1;
}
}" $1
@ -88,3 +88,7 @@ END {
check plugin_final_layout.stdout "_Z3foov" "_Z3barv"
check plugin_final_layout.stdout "_Z3barv" "_Z3bazv"
check_unique_segment plugin_final_layout_readelf.stdout ".text.plugin_created_unique"
check plugin_layout_new_file.stdout "_Z3foov" "_Z3barv"
check plugin_layout_new_file.stdout "_Z3barv" "_Z3bazv"
check_unique_segment plugin_layout_new_file_readelf.stdout ".text.plugin_created_unique"

182
gold/testsuite/plugin_new_section_layout.c Normal file
View File

@ -0,0 +1,182 @@
/* plugin_new_section_layout.c -- Simple plugin to reorder function sections in
plugin-generated objects
Copyright (C) 2017 Free Software Foundation, Inc.
Written by Stephen Crane <sjc@immunant.com>.
This file is part of gold.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* This plugin tests the new_input API of the linker plugin interface that
* allows plugins to modify section layout and assign sections to segments for
* sections in plugin-generated object files. It assumes that another plugin is
* also in use which will add new files. In practice a plugin is likely to
* generate new input files itself in all_symbols_read and want to
* reorder/assign sections for these files in the new_input_hook callback. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "plugin-api.h"
#include "elf/common.h"
static ld_plugin_get_input_section_count get_input_section_count = NULL;
static ld_plugin_get_input_section_type get_input_section_type = NULL;
static ld_plugin_get_input_section_name get_input_section_name = NULL;
static ld_plugin_update_section_order update_section_order = NULL;
static ld_plugin_allow_section_ordering allow_section_ordering = NULL;
static ld_plugin_allow_unique_segment_for_sections
allow_unique_segment_for_sections = NULL;
static ld_plugin_unique_segment_for_sections unique_segment_for_sections = NULL;
enum ld_plugin_status onload(struct ld_plugin_tv *tv);
enum ld_plugin_status new_input_hook(const struct ld_plugin_input_file *file);
/* Plugin entry point. */
enum ld_plugin_status
onload(struct ld_plugin_tv *tv)
{
struct ld_plugin_tv *entry;
for (entry = tv; entry->tv_tag != LDPT_NULL; ++entry)
{
switch (entry->tv_tag)
{
case LDPT_GET_INPUT_SECTION_COUNT:
get_input_section_count = *entry->tv_u.tv_get_input_section_count;
break;
case LDPT_GET_INPUT_SECTION_TYPE:
get_input_section_type = *entry->tv_u.tv_get_input_section_type;
break;
case LDPT_GET_INPUT_SECTION_NAME:
get_input_section_name = *entry->tv_u.tv_get_input_section_name;
break;
case LDPT_UPDATE_SECTION_ORDER:
update_section_order = *entry->tv_u.tv_update_section_order;
break;
case LDPT_ALLOW_SECTION_ORDERING:
allow_section_ordering = *entry->tv_u.tv_allow_section_ordering;
break;
case LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS:
allow_unique_segment_for_sections
= *entry->tv_u.tv_allow_unique_segment_for_sections;
break;
case LDPT_UNIQUE_SEGMENT_FOR_SECTIONS:
unique_segment_for_sections
= *entry->tv_u.tv_unique_segment_for_sections;
break;
case LDPT_REGISTER_NEW_INPUT_HOOK:
assert((*entry->tv_u.tv_register_new_input) (new_input_hook)
== LDPS_OK);
break;
default:
break;
}
}
if (get_input_section_count == NULL
|| get_input_section_type == NULL
|| get_input_section_name == NULL
|| update_section_order == NULL
|| allow_section_ordering == NULL
|| allow_unique_segment_for_sections == NULL
|| unique_segment_for_sections == NULL)
{
fprintf(stderr, "Some interfaces are missing\n");
return LDPS_ERR;
}
/* Inform the linker to prepare for section reordering. */
(*allow_section_ordering)();
/* Inform the linker to prepare to map some sections to unique
segments. */
(*allow_unique_segment_for_sections)();
return LDPS_OK;
}
inline static int is_prefix_of(const char *prefix, const char *str)
{
return strncmp(prefix, str, strlen (prefix)) == 0;
}
/* This function is called by the linker when new files are added by a plugin.
We can now tell the linker the desired function order since we have a file
handle for the newly added file. */
enum ld_plugin_status
new_input_hook(const struct ld_plugin_input_file *file)
{
struct ld_plugin_section section_list[3];
int num_entries = 0;
unsigned int count;
if (get_input_section_count(file->handle, &count) != LDPS_OK)
return LDPS_ERR;
unsigned int i;
for (i = 0; i < count; ++i)
{
struct ld_plugin_section section;
unsigned int type = 0;
char *name = NULL;
int position = 3;
section.handle = file->handle;
section.shndx = i;
if (get_input_section_type(section, &type) != LDPS_OK)
return LDPL_FATAL;
if (type != SHT_PROGBITS)
continue;
if (get_input_section_name(section, &name))
return LDPL_FATAL;
/* As in plugin_section_order.c, order is foo() followed by bar()
followed by baz() */
if (is_prefix_of(".text.", name))
{
if (strstr(name, "_Z3foov") != NULL)
position = 0;
else if (strstr(name, "_Z3barv") != NULL)
position = 1;
else if (strstr(name, "_Z3bazv") != NULL)
position = 2;
else
position = 3;
}
if (position < 3)
{
section_list[position] = section;
num_entries++;
}
}
if (num_entries != 3)
return LDPL_FATAL;
update_section_order(section_list, num_entries);
unique_segment_for_sections (".text.plugin_created_unique", 0, 0x1000,
section_list, num_entries);
return LDPS_OK;
}

9
include/ChangeLog
View File

@ -1,3 +1,12 @@
2017-12-11 Stephen Crane <sjc@immunant.com>
* plugin-api.h: Add new plugin hook to allow processing of input
files added by a plugin.
(ld_plugin_new_input_handler): New function hook type.
(ld_plugin_register_new_input): New interface.
(LDPT_REGISTER_NEW_INPUT_HOOK): New enum val.
(tv_register_new_input): New member.
2017-12-01 Peter Bergner <bergner@vnet.ibm.com>
* opcode/ppc.h (PPC_INT_FMT): Define.

18
include/plugin-api.h
View File

@ -365,6 +365,20 @@ enum ld_plugin_status
(*ld_plugin_get_input_section_size) (const struct ld_plugin_section section,
uint64_t *secsize);
typedef
enum ld_plugin_status
(*ld_plugin_new_input_handler) (const struct ld_plugin_input_file *file);
/* The linker's interface for registering the "new_input" handler. This handler
will be notified when a new input file has been added after the
all_symbols_read event, allowing the plugin to, for example, set a unique
segment for sections in plugin-generated input files. */
typedef
enum ld_plugin_status
(*ld_plugin_register_new_input) (ld_plugin_new_input_handler handler);
enum ld_plugin_level
{
LDPL_INFO,
@ -407,7 +421,8 @@ enum ld_plugin_tag
LDPT_UNIQUE_SEGMENT_FOR_SECTIONS = 27,
LDPT_GET_SYMBOLS_V3 = 28,
LDPT_GET_INPUT_SECTION_ALIGNMENT = 29,
LDPT_GET_INPUT_SECTION_SIZE = 30
LDPT_GET_INPUT_SECTION_SIZE = 30,
LDPT_REGISTER_NEW_INPUT_HOOK = 31
};
/* The plugin transfer vector. */
@ -441,6 +456,7 @@ struct ld_plugin_tv
ld_plugin_unique_segment_for_sections tv_unique_segment_for_sections;
ld_plugin_get_input_section_alignment tv_get_input_section_alignment;
ld_plugin_get_input_section_size tv_get_input_section_size;
ld_plugin_register_new_input tv_register_new_input;
} tv_u;
};