# Copyright 2020-2021 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/>.

# Test unwinding when we have a frame inlined in the outer frame (in the sense
# of frame.c:outer_frame_id).
#
# The conditions required to reproduce the original issue are:
#
#  1. Have an outer frame whose DWARF CFI explicitly says that the frame return
#     address is undefined.
#  2. A frame inlined in this other frame.
#
# Because of (1), the test has to be written in assembly with explicit CFI
# directives.

# Check if starti command is supported.
require use_gdb_stub 0

load_lib dwarf.exp

if {![dwarf2_support]} {
    return 0
}

standard_testfile .S

set dwarf_asm [standard_output_file dwarf-asm.S]
Dwarf::assemble $dwarf_asm {
    global srcfile

    declare_labels foo_subprogram bar_subprogram
    declare_labels stmt_list

    # See the comment in the .S file for the equivalent C program this is meant
    # to represent.

    cu { label cu_label addr_size 4 } {
	DW_TAG_compile_unit {
	    {DW_AT_name $srcfile}
	    {DW_AT_stmt_list $stmt_list DW_FORM_sec_offset}
	    {DW_AT_language @DW_LANG_C99}
	    {DW_AT_low_pc __cu_low_pc DW_FORM_addr}
	    {DW_AT_high_pc __cu_high_pc DW_FORM_addr}
	} {
	    DW_TAG_subprogram {
		{DW_AT_name "_start"}
		{DW_AT_low_pc __start_low_pc DW_FORM_addr}
		{DW_AT_high_pc __start_high_pc DW_FORM_addr}
	    } {
		DW_TAG_inlined_subroutine {
		    {DW_AT_abstract_origin :$foo_subprogram}
		    {DW_AT_low_pc __foo_low_pc DW_FORM_addr}
		    {DW_AT_high_pc __foo_high_pc DW_FORM_addr}
		    {DW_AT_call_file 1 DW_FORM_data1}
		    {DW_AT_call_line 13 DW_FORM_data1}
		} {
		    DW_TAG_inlined_subroutine {
			{DW_AT_abstract_origin :$bar_subprogram}
			{DW_AT_low_pc __bar_low_pc DW_FORM_addr}
			{DW_AT_high_pc __bar_high_pc DW_FORM_addr}
			{DW_AT_call_file 1 DW_FORM_data1}
			{DW_AT_call_line 7 DW_FORM_data1}
		    }
		}
	    }

	    foo_subprogram: DW_TAG_subprogram {
		{DW_AT_name "foo"}
		{DW_AT_prototyped 1 DW_FORM_flag_present}
		{DW_AT_inline 0x1 DW_FORM_data1}
	    }

	    bar_subprogram: DW_TAG_subprogram {
		{DW_AT_name "bar"}
		{DW_AT_prototyped 1 DW_FORM_flag_present}
		{DW_AT_inline 0x1 DW_FORM_data1}
	    }
	}
    }

    lines { } stmt_list {
	global srcdir subdir srcfile

	include_dir "/some/directory"
	file_name "/some/directory/file.c" 0
    }

    aranges {} cu_label {
	arange {} __cu_low_pc __cu_high_pc
    }
}

if { [build_executable ${testfile}.exp ${testfile} "$srcfile $dwarf_asm" \
      {additional_flags=-nostdlib additional_flags=-static}] != 0 } {
    untested "failed to compile"
    return
}

clean_restart $binfile

if { [gdb_starti_cmd] != 0 } {
    fail "failed to run to first instruction"
    return
}
gdb_test "" "Program stopped.*" "starti prompt"

gdb_test "frame" "in _start .*"

gdb_test "stepi" "in foo .*" "step into foo"
gdb_test "stepi" "in bar .*" "step into bar"
gdb_test "stepi" "in foo .*" "step back into foo"
gdb_test "stepi" "in _start .*" "step back into _start"