# Copyright 2019-2021 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/>.

# This test shows the importance of not corrupting the order of line
# table information.  When multiple lines are given for the same
# address the compiler usually lists these in the order in which we
# would expect to encounter them.  When stepping through nested inline
# frames the last line given for an address is assumed by GDB to be
# the most inner frame, and this is what GDB displays.
#
# If we corrupt the order of the line table entries then GDB will
# display the wrong line as being the inner most frame.

load_lib dwarf.exp

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

# The .c files use __attribute__.
if [get_compiler_info] {
    return -1
}
if !$gcc_compiled {
    return 0
}

standard_testfile .c .S

set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    global srcdir subdir srcfile srcfile2
    declare_labels ranges_label lines_label foo_prog

    lassign [function_range main [list ${srcdir}/${subdir}/$srcfile]] \
	main_start main_len
    set main_end "$main_start + $main_len"
    lassign [function_range bar [list ${srcdir}/${subdir}/$srcfile]] \
	bar_start bar_len
    set bar_end "$bar_start + $bar_len"

    set call_line [gdb_get_line_number "main call foo"]

    cu {} {
	compile_unit {
	    {language @DW_LANG_C}
	    {name dw2-inline-stepping.c}
	    {low_pc 0 addr}
	    {stmt_list ${lines_label} DW_FORM_sec_offset}
	    {ranges ${ranges_label} DW_FORM_sec_offset}
	} {
	    subprogram {
		{external 1 flag}
		{name bar}
		{low_pc $bar_start addr}
		{high_pc "$bar_start + $bar_len" addr}
	    }
	    foo_prog: subprogram {
		{name foo}
		{inline 3 data1}
	    }
	    subprogram {
		{external 1 flag}
		{name main}
		{low_pc $main_start addr}
		{high_pc "$main_start + $main_len" addr}
	    } {
		inlined_subroutine {
		    {abstract_origin %$foo_prog}
		    {low_pc main_label2 addr}
		    {high_pc main_label3 addr}
		    {call_file 1 data1}
		    {call_line $call_line data1}
		}
	    }
	}
    }

    lines {version 2} lines_label {
	include_dir "${srcdir}/${subdir}"
	file_name "$srcfile" 1

	program {
	    {DW_LNE_set_address $main_start}
	    {line [gdb_get_line_number "main prologue"]}
	    {DW_LNS_copy}
	    {DW_LNE_set_address main_label}
	    {line [gdb_get_line_number "main set global_var"]}
	    {DW_LNS_copy}
	    {DW_LNE_set_address main_label2}
	    {line [gdb_get_line_number "main call foo"]}
	    {DW_LNS_copy}
	    {DW_LNE_set_address main_label2}
	    {line [gdb_get_line_number "foo call bar"]}
	    {DW_LNS_copy}
	    {DW_LNE_set_address $main_end}
	    {DW_LNE_end_sequence}

	    {DW_LNE_set_address $bar_start}
	    {line [gdb_get_line_number "bar prologue"]}
	    {DW_LNS_copy}
	    {DW_LNE_set_address bar_label}
	    {line [gdb_get_line_number "bar return global_var"]}
	    {DW_LNS_copy}
	    {DW_LNE_set_address $bar_end}
	    {DW_LNE_end_sequence}
	}
    }

    ranges {is_64 [is_64_target]} {
	ranges_label: sequence {
	    range ${main_start} ${main_end}
	    range ${bar_start} ${bar_end}
	}
    }
}

if { [prepare_for_testing "failed to prepare" ${testfile} \
	  [list $srcfile $asm_file] {nodebug}] } {
    return -1
}

if ![runto_main] {
    return -1
}

set patterns [list "main call foo" \
		  "foo call bar" \
		  "bar return global_var"]
foreach p $patterns {
    gdb_test "step" "/\\* $p \\*/" \
	"step to '$p'"
}