# Copyright 2008-2021 Free Software Foundation, Inc.

# 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, see <http://www.gnu.org/licenses/>.
load_lib dwarf.exp

# This test can only be run on targets which support DWARF-2 and use gas.
if {![dwarf2_support]} {
    return 0  
}

standard_testfile .S -func.c -main.c
lassign [function_range func_nofb \
             "${srcdir}/${subdir}/${srcfile2} ${srcdir}/${subdir}/${srcfile3}"] \
    func_nofb_start func_nofb_len
lassign [function_range func_loopfb \
             "${srcdir}/${subdir}/${srcfile2} ${srcdir}/${subdir}/${srcfile3}"] \
    func_loopfb_start func_loopfb_len

set flags \
    [list \
         "additional_flags=\"-DFUNC_NOFB_START=$func_nofb_start\"" \
         "additional_flags=\"-DFUNC_NOFB_END=$func_nofb_start + $func_nofb_len\"" \
         "additional_flags=\"-DFUNC_LOOPFB_START=$func_loopfb_start\"" \
         "additional_flags=\"-DFUNC_LOOPFB_END=$func_loopfb_start + $func_loopfb_len\""]
set executable ${testfile}

if { [prepare_for_testing_full "failed to prepare" \
	  [list $testfile {} \
	       $srcfile [concat $flags {nodebug}]  \
	       $srcfile2 {nodebug} \
	       $srcfile3 {debug}]] == -1 } {
    return -1
}

# First try referencing DW_AT_frame_base which is not defined.
if [runto func_nofb] {
    gdb_test "p func_nofb_var" {Could not find the frame base for "func_nofb".} "func_nofb print"
    gdb_test "bt full" " in main .* main_var = 1" "func_nofb backtrace"
}

# GDB could have crashed.
clean_restart $executable

# And now try referencing DW_AT_frame_base defined using a self-reference
# (DW_OP_fbreg).
if [runto func_loopfb] {
    gdb_test "p func_loopfb_var" "DWARF-2 expression error: Loop detected .*" "func_loopfb print"
    gdb_test "bt full" " in main .* main_var = 1" "func_loopfb backtrace"
}