2013-04-29 Alexander Ivchenko <alexander.ivchenko@intel.com>

gold/
	* output.cc (Output_section::add_merge_input_section): Allow
	to merge sections if the alignment is more than character size.
	* merge.h (Output_merge_string::Output_merge_string): Remove
	assert.
	* merge.cc (Output_merge_string<Char_type>::do_add_input_section): Count
	only not-null strings. Check the alignment of strings.
	* stringpool.h
	(Stringpool_template<Stringpool_char>::Stringpool_template): Add
	alignment as the argument.
	(Stringpool_template<Stringpool_char>::addralign_): New class member.
	* stringpool.cc (Stringpool_template<Stringpool_char>::new_key_offset):
	Align non-zero length strings according to the addralign_.
	(Stringpool_template<Stringpool_char>::set_string_offsets):
	Updating offsets according to the given alignment.
	* testsuite/Makefile.am (text_section_grouping): Test if string
	literals are getting merged.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/merge_string_literals_1.c: New file.
	* testsuite/merge_string_literals_2.c: Ditto.
	* testsuite/merge_string_literals.sh: Ditto.

5 files changed, 128 insertions, 0 deletions

diff --git a/gold/testsuite/Makefile.am b/gold/testsuite/Makefile.am
index 4d0292569c..a1ac4743e9 100644
--- a/gold/testsuite/Makefile.am
+++ b/gold/testsuite/Makefile.am
@@ -329,6 +329,18 @@ icf_sht_rel_addend_test: icf_sht_rel_addend_test_1.o icf_sht_rel_addend_test_2.o
 icf_sht_rel_addend_test.stdout: icf_sht_rel_addend_test
 	$(TEST_NM) icf_sht_rel_addend_test > icf_sht_rel_addend_test.stdout
 
+check_SCRIPTS += merge_string_literals.sh
+check_DATA += merge_string_literals.stdout
+MOSTLYCLEANFILES += merge_string_literals
+merge_string_literals_1.o: merge_string_literals_1.c
+	$(CXXCOMPILE) -O2 -c -fPIC -g -o $@ $<
+merge_string_literals_2.o: merge_string_literals_2.c
+	$(CXXCOMPILE) -O2 -c -fPIC -g -o $@ $<
+merge_string_literals: merge_string_literals_1.o merge_string_literals_2.o gcctestdir/ld
+	$(CXXLINK) -Bgcctestdir/ merge_string_literals_1.o merge_string_literals_2.o -O2 -shared -nostdlib
+merge_string_literals.stdout: merge_string_literals
+	$(TEST_OBJDUMP) -s -j.rodata merge_string_literals > merge_string_literals.stdout
+
 check_PROGRAMS += basic_test
 check_PROGRAMS += basic_pic_test
 basic_test.o: basic_test.cc
diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index fa9e80f834..7d159e756a 100644
--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@@ -85,6 +85,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_preemptible_functions_test.sh \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_string_merge_test.sh \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_sht_rel_addend_test.sh \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	merge_string_literals.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 \
@@ -119,6 +120,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_preemptible_functions_test.stdout \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_string_merge_test.stdout \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_sht_rel_addend_test.stdout \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	merge_string_literals.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@am__append_4 = incremental_test \
@@ -140,6 +142,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_preemptible_functions_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_string_merge_test \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	icf_sht_rel_addend_test \
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	merge_string_literals \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	two_file_shared.dbg \
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	alt/weak_undef_lib.so
 @GCC_TRUE@@NATIVE_LINKER_TRUE@am__append_5 = icf_virtual_function_folding_test \
@@ -3755,6 +3758,8 @@ icf_string_merge_test.sh.log: icf_string_merge_test.sh
 	@p='icf_string_merge_test.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 icf_sht_rel_addend_test.sh.log: icf_sht_rel_addend_test.sh
 	@p='icf_sht_rel_addend_test.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
+merge_string_literals.sh.log: merge_string_literals.sh
+	@p='merge_string_literals.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 two_file_shared.sh.log: two_file_shared.sh
 	@p='two_file_shared.sh'; $(am__check_pre) $(LOG_COMPILE) "$$tst" $(am__check_post)
 weak_plt.sh.log: weak_plt.sh
@@ -4440,6 +4445,14 @@ uninstall-am:
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXLINK) -Bgcctestdir/ -Wl,--icf=all icf_sht_rel_addend_test_1.o icf_sht_rel_addend_test_2.o
 @GCC_TRUE@@NATIVE_LINKER_TRUE@icf_sht_rel_addend_test.stdout: icf_sht_rel_addend_test
 @GCC_TRUE@@NATIVE_LINKER_TRUE@	$(TEST_NM) icf_sht_rel_addend_test > icf_sht_rel_addend_test.stdout
+@GCC_TRUE@@NATIVE_LINKER_TRUE@merge_string_literals_1.o: merge_string_literals_1.c
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXCOMPILE) -O2 -c -fPIC -g -o $@ $<
+@GCC_TRUE@@NATIVE_LINKER_TRUE@merge_string_literals_2.o: merge_string_literals_2.c
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXCOMPILE) -O2 -c -fPIC -g -o $@ $<
+@GCC_TRUE@@NATIVE_LINKER_TRUE@merge_string_literals: merge_string_literals_1.o merge_string_literals_2.o gcctestdir/ld
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(CXXLINK) -Bgcctestdir/ merge_string_literals_1.o merge_string_literals_2.o -O2 -shared -nostdlib
+@GCC_TRUE@@NATIVE_LINKER_TRUE@merge_string_literals.stdout: merge_string_literals
+@GCC_TRUE@@NATIVE_LINKER_TRUE@	$(TEST_OBJDUMP) -s -j.rodata merge_string_literals > merge_string_literals.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
diff --git a/gold/testsuite/merge_string_literals.sh b/gold/testsuite/merge_string_literals.sh
new file mode 100755
index 0000000000..486a895963
--- /dev/null
+++ b/gold/testsuite/merge_string_literals.sh
@@ -0,0 +1,41 @@
+#!/bin/sh
+
+# merge_string_literals.sh -- test
+
+# Copyright 2013 Free Software Foundation, Inc.
+# Written by Alexander Ivchenko <alexander.ivchenko@intel.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 check whether string literals from different
+# object files are merged together
+
+set -e
+
+check()
+{
+    number_of_occurrence=`grep $2 ./$1 -o| wc -l`
+    if [ $number_of_occurrence != $3 ]
+    then
+	echo "String literals were not merged"
+	exit 1
+    fi
+}
+
+# If string literals were merged, then "abcd" appears two times
+check merge_string_literals.stdout "abcd" 2
diff --git a/gold/testsuite/merge_string_literals_1.c b/gold/testsuite/merge_string_literals_1.c
new file mode 100644
index 0000000000..fc0487c3bf
--- /dev/null
+++ b/gold/testsuite/merge_string_literals_1.c
@@ -0,0 +1,31 @@
+// merge_string_literals_1.c -- a test case for gold
+
+// Copyright 2013 Free Software Foundation, Inc.
+// Written by Alexander Ivchenko <alexander.ivchenko@intel.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 check whether string literals from different
+// object files are merged together
+
+const char* bar1() {
+    return "abcdefghijklmnopqrstuvwxyz0123456789";
+}
+const char* bar1_short() {
+    return "abcdef";
+}
diff --git a/gold/testsuite/merge_string_literals_2.c b/gold/testsuite/merge_string_literals_2.c
new file mode 100644
index 0000000000..d1185cde12
--- /dev/null
+++ b/gold/testsuite/merge_string_literals_2.c
@@ -0,0 +1,31 @@
+// merge_string_literals_2.c -- a test case for gold
+
+// Copyright 2013 Free Software Foundation, Inc.
+// Written by Alexander Ivchenko <alexander.ivchenko@intel.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 check whether string literals from different
+// object files are merged together
+
+const char* bar2() {
+    return "abcdefghijklmnopqrstuvwxyz0123456789";
+}
+const char* bar2_short() {
+    return "abcdef";
+}