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Sriraman Tallam <tmsriram@google.com>

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* icf.cc (Icf::find_identical_sections): Unfold symbols that have
	been maked as --keep-unique.
	(Icf::unfold_section): New function.
	* icf.h (Icf::unfold_section): New function.
	* options.h (General_options::keep_unique): New option.
	* testsuite/Makefile.am: Add commands to build icf_keep_unique_test.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/icf_keep_unique_test.sh: New file.
	* testsuite/icf_keep_unique_test.cc: New file.
This commit is contained in:
Sriraman Tallam 2009-08-12 19:03:16 +00:00
parent 645afe0c5b
commit 48c187ced8
8 changed files with 152 additions and 1 deletions
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12
gold/ChangeLog
View File

@ -1,3 +1,15 @@
2009-08-12 Sriraman Tallam <tmsriram@google.com>
* icf.cc (Icf::find_identical_sections): Unfold symbols that have
been maked as --keep-unique.
(Icf::unfold_section): New function.
* icf.h (Icf::unfold_section): New function.
* options.h (General_options::keep_unique): New option.
* testsuite/Makefile.am: Add commands to build icf_keep_unique_test.
* testsuite/Makefile.in: Regenerate.
* testsuite/icf_keep_unique_test.sh: New file.
* testsuite/icf_keep_unique_test.cc: New file.
2009-08-12 Cary Coutant <ccoutant@google.com>
PR 10471

38
gold/icf.cc
View File

@ -598,9 +598,47 @@ Icf::find_identical_sections(const Input_objects* input_objects,
program_name, num_iterations);
}
// Unfold --keep-unique symbols.
for (options::String_set::const_iterator p =
parameters->options().keep_unique_begin();
p != parameters->options().keep_unique_end();
++p)
{
const char* name = p->c_str();
Symbol* sym = symtab->lookup(name);
if (sym != NULL
&& sym->source() == Symbol::FROM_OBJECT
&& !sym->object()->is_dynamic())
{
Object* obj = sym->object();
bool is_ordinary;
unsigned int shndx = sym->shndx(&is_ordinary);
if (is_ordinary)
{
this->unfold_section(obj, shndx);
}
}
}
this->icf_ready();
}
// Unfolds the section denoted by OBJ and SHNDX if folded.
void
Icf::unfold_section(Object* obj, unsigned int shndx)
{
Section_id secn(obj, shndx);
Uniq_secn_id_map::iterator it = this->section_id_.find(secn);
if (it == this->section_id_.end())
return;
unsigned int section_num = it->second;
unsigned int kept_section_id = this->kept_section_id_[section_num];
if (kept_section_id != section_num)
this->kept_section_id_[section_num] = section_num;
}
// This function determines if the section corresponding to the
// given object and index is folded based on if the kept section
// is different from this section.

4
gold/icf.h
View File

@ -87,6 +87,10 @@ class Icf
is_icf_ready()
{ return this->icf_ready_; }
// Unfolds the section denoted by OBJ and SHNDX if folded.
void
unfold_section(Object* obj, unsigned int shndx);
// Returns the kept section corresponding to the
// given section.
bool

5
gold/options.h
View File

@ -814,7 +814,7 @@ class General_options
N_("Do not link against shared libraries"), NULL);
DEFINE_bool(icf, options::TWO_DASHES, '\0', false,
N_("Fold identical functions"),
N_("Identical Code Folding (Fold identical functions)"),
N_("Don't fold identical functions (default)"));
DEFINE_uint(icf_iterations, options::TWO_DASHES , '\0', 0,
@ -824,6 +824,9 @@ class General_options
N_("List folded identical sections on stderr"),
N_("Do not list folded identical sections"));
DEFINE_set(keep_unique, options::TWO_DASHES, '\0',
N_("Do not fold this symbol during ICF"), N_("SYMBOL"));
DEFINE_bool(gc_sections, options::TWO_DASHES, '\0', false,
N_("Remove unused sections"),
N_("Don't remove unused sections (default)"));

8
gold/testsuite/Makefile.am
View File

@ -133,6 +133,14 @@ icf_test: icf_test.o gcctestdir/ld
icf_test.stdout: icf_test
$(TEST_NM) -C icf_test > icf_test.stdout
check_SCRIPTS += icf_keep_unique_test.sh
check_DATA += icf_keep_unique_test.stdout
icf_keep_unique_test.o: icf_keep_unique_test.cc
$(CXXCOMPILE) -O0 -c -ffunction-sections -g -o $@ $<
icf_keep_unique_test: icf_keep_unique_test.o gcctestdir/ld
$(CXXLINK) -Bgcctestdir/ -Wl,--icf -Wl,--keep-unique,_Z11unique_funcv icf_keep_unique_test.o
icf_keep_unique_test.stdout: icf_keep_unique_test
$(TEST_NM) -C icf_keep_unique_test > icf_keep_unique_test.stdout
check_PROGRAMS += basic_test
check_PROGRAMS += basic_static_test

8
gold/testsuite/Makefile.in
View File

@ -58,6 +58,7 @@ check_PROGRAMS = object_unittest$(EXEEXT) binary_unittest$(EXEEXT) \
# and --dynamic-list-cpp-typeinfo
@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_1 = gc_comdat_test.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ gc_tls_test.sh icf_test.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ icf_keep_unique_test.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ two_file_shared.sh weak_plt.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ debug_msg.sh undef_symbol.sh \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ ver_test_1.sh ver_test_2.sh \
@ -77,6 +78,7 @@ check_PROGRAMS = object_unittest$(EXEEXT) binary_unittest$(EXEEXT) \
@GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_2 = gc_comdat_test.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ gc_tls_test.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ icf_test.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ icf_keep_unique_test.stdout \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ two_file_shared.dbg \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ weak_plt_shared.so debug_msg.err \
@GCC_TRUE@@NATIVE_LINKER_TRUE@ debug_msg_so.err \
@ -2337,6 +2339,12 @@ uninstall-am: uninstall-info-am
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXLINK) -Bgcctestdir/ -Wl,--icf icf_test.o
@GCC_TRUE@@NATIVE_LINKER_TRUE@icf_test.stdout: icf_test
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_NM) -C icf_test > icf_test.stdout
@GCC_TRUE@@NATIVE_LINKER_TRUE@icf_keep_unique_test.o: icf_keep_unique_test.cc
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXCOMPILE) -O0 -c -ffunction-sections -g -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@icf_keep_unique_test: icf_keep_unique_test.o gcctestdir/ld
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXLINK) -Bgcctestdir/ -Wl,--icf -Wl,--keep-unique,_Z11unique_funcv icf_keep_unique_test.o
@GCC_TRUE@@NATIVE_LINKER_TRUE@icf_keep_unique_test.stdout: icf_keep_unique_test
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(TEST_NM) -C icf_keep_unique_test > icf_keep_unique_test.stdout
@GCC_TRUE@@NATIVE_LINKER_TRUE@basic_test.o: basic_test.cc
@GCC_TRUE@@NATIVE_LINKER_TRUE@ $(CXXCOMPILE) -O0 -c -o $@ $<
@GCC_TRUE@@NATIVE_LINKER_TRUE@basic_test: basic_test.o gcctestdir/ld

39
gold/testsuite/icf_keep_unique_test.cc Normal file
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@ -0,0 +1,39 @@
// icf_keep_unique_test.cc -- a test case for gold
// Copyright 2009 Free Software Foundation, Inc.
// Written by Sriraman Tallam <tmsriram@google.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.
// The goal of this program is to verify if --keep-unique works
// as intended when used with --icf.
int kept_func()
{
return 0;
}
int unique_func()
{
return 0;
}
int main()
{
return 1;
}

39
gold/testsuite/icf_keep_unique_test.sh Executable file
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@ -0,0 +1,39 @@
#!/bin/sh
# icf_keep_unique_test.sh -- test --icf --keep-unique
# Copyright 2009 Free Software Foundation, Inc.
# Written by Sriraman Tallam <tmsriram@google.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.
# The goal of this program is to verify if --keep-unique works
# as intended when used with --icf.
check()
{
func_addr_1=`grep $2 $1 | awk '{print $1}'`
func_addr_2=`grep $3 $1 | awk '{print $1}'`
if [ $func_addr_1 = $func_addr_2 ]
then
echo "Identical Code Folding with keep-unique failed to unfold" $2
exit 1
fi
}
check icf_keep_unique_test.stdout "kept_func" "unique_func"