binutils-gdb/ld/testsuite/ld-elf/sec64k.exp
H.J. Lu d1bcae833b ELF: Don't generate unused section symbols
For ELF targets, section symbols are required only for relocations.
With -ffunction-sections -fdata-sections, there can be many unused
section symbols.  Sizes of libstdc++.a on Linux/x86-64 in GCC 11 are

With unused section symbols   : 39411698 bytes
Without unused section symbols: 39227002 bytes

The unused section symbols in libstdc++.a occupy more than 180 KB.

Add BSF_SECTION_SYM_USED to indicate if a section symbol should be
included in the symbol table.  The BSF_SECTION_SYM_USED should be set
if the section symbol is used for relocation or the section symbol is
always included in the symbol table.

Add keep_unused_section_symbols to bfd_target to indicate if unused
section symbols should be kept.  If TARGET_KEEP_UNUSED_SECTION_SYMBOLS
is defined as FALSE, unused ection symbols will be removed.

Tested on Linux/x86.  Other ELF backends need to:

1. Define TARGET_KEEP_UNUSED_SECTION_SYMBOLS to FALSE.
2. Mark used section symbols in assembler backend.
3. Remove unused section symbols from expected assembler and linker
outputs.

bfd/

	PR 27109
	* aix386-core.c (core_aix386_vec): Initialize
	keep_unused_section_symbol to TARGET_KEEP_UNUSED_SECTION_SYMBOLS.
	* aout-target.h (MY (vec)): Likewise.
	* binary.c (binary_vec): Likewise.
	* cisco-core.c (core_cisco_be_vec): Likewise.
	(core_cisco_le_vec): Likewise.
	* coff-alpha.c (alpha_ecoff_le_vec): Likewise.
	* coff-i386.c (TARGET_SYM): Likewise.
	(TARGET_SYM_BIG): Likewise.
	* coff-ia64.c (TARGET_SYM): Likewise.
	* coff-mips.c (mips_ecoff_le_vec): Likewise.
	(mips_ecoff_be_vec): Likewise.
	(mips_ecoff_bele_vec): Likewise.
	* coff-rs6000.c (rs6000_xcoff_vec): Likewise.
	(powerpc_xcoff_vec): Likewise.
	* coff-sh.c (sh_coff_small_vec): Likewise.
	(sh_coff_small_le_vec): Likewise.
	* coff-tic30.c (tic30_coff_vec): Likewise.
	* coff-tic54x.c (tic54x_coff0_vec): Likewise.
	(tic54x_coff0_beh_vec): Likewise.
	(tic54x_coff1_vec): Likewise.
	(tic54x_coff1_beh_vec): Likewise.
	(tic54x_coff2_vec): Likewise.
	(tic54x_coff2_beh_vec): Likewise.
	* coff-x86_64.c (TARGET_SYM): Likewise.
	(TARGET_SYM_BIG): Likewise.
	* coff64-rs6000.c (rs6000_xcoff64_vec): Likewise.
	(rs6000_xcoff64_aix_vec): Likewise.
	* coffcode.h (CREATE_BIG_COFF_TARGET_VEC): Likewise.
	(CREATE_BIGHDR_COFF_TARGET_VEC): Likewise.
	(CREATE_LITTLE_COFF_TARGET_VEC): Likewise.
	* elfxx-target.h (TARGET_BIG_SYM): Likewise.
	(TARGET_LITTLE_SYM): Likewise.
	* hppabsd-core.c (core_hppabsd_vec): Likewise.
	* hpux-core.c (core_hpux_vec): Likewise.
	* i386msdos.c (i386_msdos_vec): Likewise.
	* ihex.c (ihex_vec): Likewise.
	* irix-core.c (core_irix_vec): Likewise.
	* mach-o-target.c (TARGET_NAME): Likewise.
	* mmo.c (mmix_mmo_vec): Likewise.
	* netbsd-core.c (core_netbsd_vec): Likewise.
	* osf-core.c (core_osf_vec): Likewise.
	* pdp11.c (MY (vec)): Likewise.
	* pef.c (pef_vec): Likewise.
	(pef_xlib_vec): Likewise.
	* plugin.c (plugin_vec): Likewise.
	* ppcboot.c (powerpc_boot_vec): Likewise.
	* ptrace-core.c (core_ptrace_vec): Likewise.
	* sco5-core.c (core_sco5_vec): Likewise.
	* som.c (hppa_som_vec): Likewise.
	* srec.c (srec_vec): Likewise.
	(symbolsrec_vec): Likewise.
	* tekhex.c (tekhex_vec): Likewise.
	* trad-core.c (core_trad_vec): Likewise.
	* verilog.c (verilog_vec): Likewise.
	* vms-alpha.c (alpha_vms_vec): Likewise.
	* vms-lib.c (alpha_vms_lib_txt_vec): Likewise.
	* wasm-module.c (wasm_vec): Likewise.
	* xsym.c (sym_vec): Likewise.
	* elf.c (ignore_section_sym): Return TRUE if BSF_SECTION_SYM_USED
	isn't set.
	(elf_map_symbols): Don't include ignored section symbols.
	* elfcode.h (elf_slurp_symbol_table): Also set
	BSF_SECTION_SYM_USED on STT_SECTION symbols.
	* elflink.c (bfd_elf_final_link): Generated section symbols only
	when emitting relocations or reqired.
	* elfxx-x86.h (TARGET_KEEP_UNUSED_SECTION_SYMBOLS): New.
	* syms.c (BSF_SECTION_SYM_USED): New.
	* targets.c (TARGET_KEEP_UNUSED_SECTION_SYMBOLS): New.
	(bfd_target): Add keep_unused_section_symbols.
	(bfd_keep_unused_section_symbols): New.
	* bfd-in2.h: Regenerated.

binutils/

	PR 27109
	* objcopy.c (copy_object): Handle section symbols for
	non-relocatable inputs.
	* testsuite/binutils-all/readelf.exp (readelf_test): Check
	is_elf_unused_section_symbols.
	* testsuite/binutils-all/readelf.s-64: Updated.
	* testsuite/binutils-all/readelf.ss: Likewise.
	* testsuite/binutils-all/readelf.ss-64: Likewise.
	* testsuite/binutils-all/readelf.s-64-unused: New file.
	* testsuite/binutils-all/readelf.ss-64-unused: Likewise.
	* testsuite/binutils-all/readelf.ss-unused: Likewise.
	* testsuite/lib/binutils-common.exp
	(is_elf_unused_section_symbols): New proc.

gas/ChangeLog:

	PR 27109
	* read.c (s_reloc): Call symbol_mark_used_in_reloc on the
	section symbol.
	* subsegs.c (subseg_set_rest): Set BSF_SECTION_SYM_USED if needed.
	* write.c (adjust_reloc_syms): Call symbol_mark_used_in_reloc
	on the section symbol.
	(set_symtab): Don't generate unused section symbols.
	(maybe_generate_build_notes): Call symbol_mark_used_in_reloc
	on the section symbol.
	* config/obj-elf.c (elf_adjust_symtab): Call
	symbol_mark_used_in_reloc on the group signature symbol.
	* testsuite/gas/cfi/cfi-label.d: Remove unused section symbols
	from expected output.
	* testsuite/gas/elf/elf.exp (run_elf_list_test): Check
	is_elf_unused_section_symbols.
	* testsuite/gas/elf/section2.e: Updated.
	* testsuite/gas/elf/section2.e-unused: New file.
	* testsuite/gas/elf/symver.d: Remove unused section symbols.
	* testsuite/gas/i386/ilp32/elf/symver.d: Likewise.
	* testsuite/gas/i386/ilp32/x86-64-size-1.d: Likewise.
	* testsuite/gas/i386/ilp32/x86-64-size-3.d: Likewise.
	* testsuite/gas/i386/ilp32/x86-64-size-5.d: Likewise.
	* testsuite/gas/i386/ilp32/x86-64-unwind.d: Likewise.
	* testsuite/gas/i386/size-1.d: Likewise.
	* testsuite/gas/i386/size-3.d: Likewise.
	* testsuite/gas/i386/svr4.d: Likewise.
	* testsuite/gas/i386/x86-64-size-1.d: Likewise.
	* testsuite/gas/i386/x86-64-size-3.d: Likewise.
	* testsuite/gas/i386/x86-64-size-5.d: Likewise.
	* testsuite/gas/i386/x86-64-unwind.d: Likewise.

ld/

	PR 27109
	* testsuite/ld-elf/export-class.sd: Adjust the expected output.
	* testsuite/ld-elf/loadaddr3b.d: Likewise.
	* testsuite/ld-i386/ibt-plt-1.d: Likewise.
	* testsuite/ld-i386/ibt-plt-2a.d: Likewise.
	* testsuite/ld-i386/ibt-plt-2c.d: Likewise.
	* testsuite/ld-i386/ibt-plt-3a.d: Likewise.
	* testsuite/ld-i386/ibt-plt-3c.d: Likewise.
	* testsuite/ld-i386/pr19636-1d.d: Likewise.
	* testsuite/ld-i386/pr19636-1l.d: Likewise.
	* testsuite/ld-i386/pr19636-2c.d: Likewise.
	* testsuite/ld-ifunc/ifunc-2-i386-now.d: Likewise.
	* testsuite/ld-ifunc/ifunc-2-local-i386-now.d: Likewise.
	* testsuite/ld-ifunc/ifunc-2-local-x86-64-now.d: Likewise.
	* testsuite/ld-ifunc/ifunc-2-x86-64-now.d: Likewise.
	* testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise.
	* testsuite/ld-ifunc/pr17154-i386-now.d: Likewise.
	* testsuite/ld-ifunc/pr17154-i386.d: Likewise.
	* testsuite/ld-ifunc/pr17154-x86-64-now.d: Likewise.
	* testsuite/ld-ifunc/pr17154-x86-64.d: Likewise.
	* testsuite/ld-x86-64/bnd-branch-1-now.d: Likewise.
	* testsuite/ld-x86-64/bnd-ifunc-1-now.d: Likewise.
	* testsuite/ld-x86-64/bnd-ifunc-2-now.d: Likewise.
	* testsuite/ld-x86-64/bnd-ifunc-2.d: Likewise.
	* testsuite/ld-x86-64/bnd-plt-1-now.d: Likewise.
	* testsuite/ld-x86-64/bnd-plt-1.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-1-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-1.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2a-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2a.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2c-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-2c.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3a-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3a.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3c-x32.d: Likewise.
	* testsuite/ld-x86-64/ibt-plt-3c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-4e.d: Likewise.
	* testsuite/ld-x86-64/pr19609-6a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-6b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-7b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-7d.d: Likewise.
	* testsuite/ld-x86-64/pr19636-2l.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1d.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1h.d: Likewise.
	* testsuite/ld-x86-64/pr21038b-now.d: Likewise.
	* testsuite/ld-x86-64/pr21038b.d: Likewise.
	* testsuite/ld-x86-64/pr21038c-now.d: Likewise.
	* testsuite/ld-x86-64/pr21038c.d: Likewise.
	* testsuite/ld-x86-64/pr23854.d: Likewise.
	* testsuite/ld-x86-64/pr25416-3.d: Likewise.
	* testsuite/ld-x86-64/pr25416-4.d: Likewise.
	* testsuite/ld-i386/plt-pic.pd: Likewise.
	* testsuite/ld-i386/plt-pic2.dd: Likewise.
	* testsuite/ld-i386/plt.pd: Likewise.
	* testsuite/ld-i386/plt2.dd: Likewise.
	* testsuite/ld-i386/tlsbin.rd: Likewise.
	* testsuite/ld-i386/tlsbin2.rd: Likewise.
	* testsuite/ld-i386/tlsbindesc.rd: Likewise.
	* testsuite/ld-i386/tlsdesc.rd: Likewise.
	* testsuite/ld-i386/tlsgdesc.rd: Likewise.
	* testsuite/ld-i386/tlsnopic.rd: Likewise.
	* testsuite/ld-i386/tlspic.rd: Likewise.
	* testsuite/ld-i386/tlspic2.rd: Likewise.
	* testsuite/ld-x86-64/mpx3.dd: Likewise.
	* testsuite/ld-x86-64/mpx3n.dd: Likewise.
	* testsuite/ld-x86-64/mpx4.dd: Likewise.
	* testsuite/ld-x86-64/mpx4n.dd: Likewise.
	* testsuite/ld-x86-64/pe-x86-64-1.od: Likewise.
	* testsuite/ld-x86-64/pe-x86-64-2.od: Likewise.
	* testsuite/ld-x86-64/pe-x86-64-3.od: Likewise.
	* testsuite/ld-x86-64/pe-x86-64-4.od: Likewise.
	* testsuite/ld-x86-64/plt.pd: Likewise.
	* testsuite/ld-x86-64/plt2.dd: Likewise.
	* testsuite/ld-x86-64/tlsbin.rd: Likewise.
	* testsuite/ld-x86-64/tlsbin2.rd: Likewise.
	* testsuite/ld-x86-64/tlsbindesc.rd: Likewise.
	* testsuite/ld-x86-64/tlsdesc.rd: Likewise.
	* testsuite/ld-x86-64/tlsgdesc.rd: Likewise.
	* testsuite/ld-x86-64/tlspic.rd: Likewise.
	* testsuite/ld-x86-64/tlspic2.rd: Likewise.
	* testsuite/ld-elf/sec64k.exp: Check
	is_elf_unused_section_symbols.
2021-01-07 06:46:55 -08:00

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# Expect script for tests for >64k sections
# Copyright (C) 2002-2021 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# 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.
#
# Written by Hans-Peter Nilsson (hp@axis.com)
#
# Exclude non-ELF targets.
if ![is_elf_format] {
return
}
# Targets using _bfd_generic_final_link don't sort section symbols
# before local symbols, so don't bother testing them.
if { [is_generic] } {
return
}
# ft32, h8300, ip2k, m68hc11 and m68hc12 run out of address space.
if {[istarget "ft32-*-*"]
|| [istarget "h8300-*-*"]
|| [istarget "ip2k-*-*"]
|| [istarget "m68hc1*-*"] } {
return
}
# Test >64k sections, with and without -r. First, create the assembly
# files. Have a relocation to another section and one within the local
# section.
set test1 "64ksec-r"
set test2 "64ksec"
if { ![runtest_file_p $runtests $test1] \
&& ![runtest_file_p $runtests $test2] } {
return
}
set sfiles {}
set max_sec 66000
set secs_per_file 1000
for { set i 0 } { $i < $max_sec / $secs_per_file } { incr i } {
set sfile "./tmpdir/sec64-$i.s"
lappend sfiles $sfile
if [catch { set ofd [open $sfile w] } x] {
perror "$x"
unresolved $test1
unresolved $test2
return
}
if { $i == 0 } {
puts $ofd " .global start"
puts $ofd "start:"
puts $ofd " .global _start"
puts $ofd "_start:"
puts $ofd " .global __start"
puts $ofd "__start:"
puts $ofd " .global main"
puts $ofd "main:"
puts $ofd " .global _main"
puts $ofd "_main:"
puts $ofd " .global foo_0"
puts $ofd "foo_0: .dc.a 0"
}
# Make sure the used section is not covered by common linker scripts.
# They should get separate section entries even without -r.
puts $ofd " .altmacro"
puts $ofd " .macro sec secn, secp"
if {![istarget "frv-*-*linux*"]} then {
puts $ofd " .section .foo.\\secn,\"ax\""
} else {
puts $ofd " .section .foo.\\secn,\"aw\""
}
puts $ofd " .global foo_\\secn"
puts $ofd "foo_\\secn:"
puts $ofd " .dc.a foo_\\secp"
puts $ofd "bar_\\secn:"
puts $ofd " .dc.a bar_\\secn"
puts $ofd " .endm"
if {![istarget "bfin-*-*"]} then {
puts $ofd " secn = [expr $i * $secs_per_file]"
} else {
puts $ofd " .set secn, [expr $i * $secs_per_file]"
}
puts $ofd " .rept $secs_per_file"
if {![istarget "bfin-*-*"]} then {
puts $ofd " secn = secn + 1"
} else {
puts $ofd " .set secn, secn + 1"
}
puts $ofd " sec %(secn), %(secn-1)"
puts $ofd " .endr"
close $ofd
}
if [catch { set ofd [open "tmpdir/$test1.d" w] } x] {
perror "$x"
unresolved $test1
unresolved $test2
return
}
# The ld-r linked file will contain relocation-sections too, so make it
# half the size in order to try and keep the test-time down.
# The m32r target generates both REL and RELA relocs (for historical
# reasons) so the expected number of sections will be much more than
# 68000, which throws this particular test right off.
if { ![istarget "m32r-*-*"] } then {
foreach sfile [lrange $sfiles 0 [expr [llength $sfiles] / 2]] {
puts $ofd "#source: $sfile"
}
#force z80 target to compile for eZ80 in ADL mode
if { [istarget "z80-*-*"] } then {
puts $ofd "#as: -ez80-adl"
}
puts $ofd "#ld: -r"
puts $ofd "#readelf: -W -Ss"
puts $ofd "There are 680.. section headers.*:"
puts $ofd "#..."
puts $ofd " \\\[ 0\\\] .* 680\[0-9\]\[0-9\]\[ \]+0\[ \]+0"
puts $ofd "#..."
puts $ofd " \\\[ \[0-9\]\\\] \.foo\.1\[ \]+PROGBITS\[ \]+.*"
puts $ofd "#..."
puts $ofd " \\\[65279\\\] (.rel\[a\]?)?\\.foo\\.\[0-9\]+ .*"
puts $ofd " \\\[65280\\\] (.rel\[a\]?)?\\.foo\\.\[0-9\]+ .*"
puts $ofd "#..."
puts $ofd " 340..: 0+\[ \]+0\[ \]+SECTION\[ \]+LOCAL\[ \]+DEFAULT\[ \]+68... .*"
puts $ofd "#..."
puts $ofd " 340..: 0+(2|4|8)\[ \]+0\[ \]+NOTYPE\[ \]+LOCAL\[ \]+DEFAULT\[ \]+\[2-7\] bar_1$"
puts $ofd "#..."
puts $ofd ".* bar_34000$"
puts $ofd "#..."
# Global symbols are not in "alphanumeric" order, so we just check
# that the first and the last are present in any order (assuming no
# duplicates).
puts $ofd ".* (\[0-9\] foo_1|68... foo_34000)$"
puts $ofd "#..."
puts $ofd ".* (\[0-9\] foo_1|68... foo_34000)$"
puts $ofd "#pass"
close $ofd
run_dump_test "tmpdir/$test1"
}
if [catch { set ofd [open "tmpdir/$test2.d" w] } x] {
perror "$x"
unresolved $test2
return
}
# too big for avr, d10v and msp
# lack of fancy orphan section handling causes overlap on fr30 and iq2000
# lm32 complains about relocations in read-only sections
if { ![istarget "d10v-*-*"]
&& ![istarget "avr-*-*"]
&& ![istarget "msp*-*-*"]
&& ![istarget "fr30-*-*"]
&& ![istarget "iq2000-*-*"]
&& ![istarget "lm32-*-linux*"]
&& ![istarget "pru-*-*"] } {
foreach sfile $sfiles { puts $ofd "#source: $sfile" }
if { [istarget spu*-*-*] } {
puts $ofd "#ld: --local-store 0:0"
} elseif { [istarget "i?86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
puts $ofd "#ld: -z noseparate-code"
} else {
puts $ofd "#ld:"
}
#force z80 target to compile for eZ80 in ADL mode
if { [istarget "z80-*-*"] } then {
puts $ofd "#as: -ez80-adl"
}
puts $ofd "#readelf: -W -Ss"
puts $ofd "There are 660.. section headers.*:"
puts $ofd "#..."
puts $ofd " \\\[ 0\\\] .* 660..\[ \]+0\[ \]+0"
puts $ofd "#..."
puts $ofd " \\\[65279\\\] \\.foo\\.\[0-9\]+ .*"
puts $ofd " \\\[65280\\\] \\.foo\\.\[0-9\]+ .*"
puts $ofd "#..."
if { [is_elf_unused_section_symbols ] } {
puts $ofd " 660..: \[0-9a-f\]+\[ \]+0\[ \]+SECTION\[ \]+LOCAL\[ \]+DEFAULT\[ \]+660.. "
puts $ofd "#..."
puts $ofd " 660..: \[0-9a-f\]+\[ \]+0\[ \]+NOTYPE\[ \]+LOCAL\[ \]+DEFAULT\[ \]+\[0-9\] bar_1$"
puts $ofd "#..."
puts $ofd ".* bar_66000$"
} else {
puts $ofd " 66...: \[0-9a-f\]+\[ \]+0\[ \]+NOTYPE\[ \]+LOCAL\[ \]+DEFAULT\[ \]+660.. bar_66000$"
}
puts $ofd "#..."
# Global symbols are not in "alphanumeric" order, so we just check
# that the first and the last are present in any order (assuming no
# duplicates).
puts $ofd ".* (\[0-9\] foo_1|66... foo_66000)$"
puts $ofd "#..."
puts $ofd ".* (\[0-9\] foo_1|66... foo_66000)$"
puts $ofd "#pass"
close $ofd
run_dump_test "tmpdir/$test2"
}
for { set i 1 } { $i < $max_sec / $secs_per_file } { incr i } {
catch "exec rm -f tmpdir/dump$i.o" status
}