# Test handling of weak undefined symbols
#   Copyright (C) 2001-2020 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.

# The linker should accept references to undefined weaks without error,
# and resolve them to zero in a static executable.  Ought to work for
# some a.out targets too.
set testname "weak undefined data symbols"

if { ![is_elf_format] && ![is_pecoff_format] } then {
    unsupported $testname
} elseif {![ld_assemble $as $srcdir/$subdir/weak-undef.s \
	    tmpdir/weak-undef.o]} then {
    # It's OK if .weak doesn't work on this target.
    unresolved $testname
} elseif {![ld_link $ld tmpdir/weak-undef \
		"tmpdir/weak-undef.o -T $srcdir/$subdir/weak-undef.t"]} then {
    # Weak symbols are broken for non-i386 PE targets.
    if {! [istarget i?86-*-*]} {
	setup_xfail *-*-pe*
    }
    fail $testname
} elseif {![is_remote host] && [which $objdump] == 0} then {
    unresolved $testname
} else {
    set exec_output [run_host_cmd "$objdump" "-s tmpdir/weak-undef"]
    set exec_output [prune_warnings $exec_output]
    verbose -log $exec_output

    set output_regexp ".*Contents of section .data:.*0000 00000000 11111111.*"

    if {[regexp $output_regexp $exec_output]} then {
	pass $testname
    } else {
	fail $testname
    }
}

proc undef_weak_so { testname opts passval } {
    global ld
    global nm

    if {![ld_link $ld tmpdir/weak-fundef.so \
	  "$opts tmpdir/weak-fundef.o"]} then {
	fail $testname
    } elseif {![is_remote host] && [which $nm] == 0} then {
	unresolved $testname
    } else {
	set exec_output [run_host_cmd "$nm" "-D tmpdir/weak-fundef.so"]
	set exec_output [prune_warnings $exec_output]

	set output_regexp ".*w undef_weak_fun.*"
	if {[regexp $output_regexp $exec_output] == $passval} then {
	    pass $testname
	} else {
	    fail $testname
	}
	return 1
    }
    return 0
}

proc undef_weak_exe { testname opts passval } {
    global ld
    global nm

    if {![ld_link $ld tmpdir/weak-fundef \
	  "$opts tmpdir/weak-fundef.o tmpdir/weak-fundef.so"]} then {
	fail $testname
    } elseif {![is_remote host] && [which $nm] == 0} then {
	unresolved $testname
    } else {
	set exec_output [run_host_cmd "$nm" "-D tmpdir/weak-fundef"]
	set exec_output [prune_warnings $exec_output]

	set output_regexp ".*w undef_weak_fun.*"
	if {[regexp $output_regexp $exec_output] == $passval} then {
	    pass $testname
	} else {
	    fail $testname
	}
    }
}

# When linking a shared lib, weak undefined symbols should become dynamic.
set testname "weak undefined function symbols in shared lib"

set asflags ""
switch -glob $target_triplet {
    aarch64* -
    arm* -
    powerpc* { set asflags "--defsym BL=1" }
    hppa* { set asflags "--defsym HPPA=1" }
    i\[3-7\]86* -
    x86_64* { set asflags "--defsym CALLPLT=1" }
}

if { $asflags == "" || ![is_elf_format] || ![check_shared_lib_support]} then {
    unsupported $testname
} elseif {![ld_assemble $as "$asflags $srcdir/$subdir/weak-fundef.s" \
		tmpdir/weak-fundef.o]} then {
    fail $testname
} elseif { [undef_weak_so $testname "--shared" 1] } then {

    # When linking a dynamic executable, weak undefined symbols become dynamic.
    set testname "weak undefined function symbols in dynamic exe"
    undef_weak_exe $testname "--no-as-needed" 1

    # Find -z options supported by the default emulation
    set emul [get_target_emul]
    set cmd [list "$ld --help 2>&1 | sed -e '1,/^$emul:/d;/^\[^ \]*:/,\$d'"]
    set status [remote_exec host [concat sh -c $cmd]]
    if { [lindex $status 0] != 0 } {
	verbose -log "$cmd exited with status [lindex $status 0]"
    }
    set emulopt [lindex $status 1]

    if { [string first "dynamic-undefined-weak" $emulopt] >= 0 } {
	# -z dynamic-undefined-weak is supported.  Let's see if it works.

	set testname "weak undefined functions in shared lib, no dyn undef weak"
	undef_weak_so $testname "--shared -z nodynamic-undefined-weak" 0

	set testname "weak undefined functions in shared lib, dyn undef weak"
	undef_weak_so $testname "--shared -z dynamic-undefined-weak" 1

	set testname "weak undefined functions in dynamic exe, no dyn undef weak"
	undef_weak_exe $testname "-z nodynamic-undefined-weak" 0

	set testname "weak undefined functions in dynamic exe, dyn undef weak"
	undef_weak_exe $testname "-z dynamic-undefined-weak" 1

	set testname "weak undefined functions in pie, no dyn undef weak"
	undef_weak_exe $testname "-pie -z nodynamic-undefined-weak" 0

	set testname "weak undefined functions in pie, dyn undef weak"
	undef_weak_exe $testname "-pie -z dynamic-undefined-weak" 1
    }
}