gdb/testsuite/gdb.dwarf2/dw2-inline-small-func.exp

# 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/>.

# Check for an issue in GDB where buildsym_compunit::record_line was
# removing duplicate line table entries, but skip_prologue_using_sal
# depends on these duplicates to spot the end of the prologue.
#
# When the de-duplication was added this regression was not spotted as
# it requires a particular combination of a (very) small function
# being inlined into an also very small outer function.
#
# This test recreates the exact combination of line table entries that
# were seen in the original test using the Dejagnu DWARF compiler.

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 -lbls.c .S \
    .c .h

set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    global srcdir subdir srcfile srcfile3 srcfile4
    declare_labels lines_label callee_subprog_label

    get_func_info main {debug optimize=-O1}

    cu {} {
	# It is important that the producer here be 'clang' as, at the
	# time of writing this, GCC for x86-64 doesn't make use of
	# skip_prologue_using_sal, while clang does.
	compile_unit {
	    {producer "clang xxxx" }
	    {language @DW_LANG_C}
	    {name ${srcfile3}}
	    {low_pc 0 addr}
	    {stmt_list ${lines_label} DW_FORM_sec_offset}
	} {
	    callee_subprog_label: subprogram {
		{external 1 flag}
		{name callee}
		{inline 3 data1}
	    }
	    subprogram {
		{external 1 flag}
		{name main}
		{low_pc $main_start addr}
		{high_pc "$main_start + $main_len" addr}
	    } {
		inlined_subroutine {
		    {abstract_origin %$callee_subprog_label}
		    {low_pc line_label_1 addr}
		    {high_pc line_label_2 addr}
		    {call_file 1 data1}
		    {call_line 21 data1}
		}
	    }
	}
    }

    lines {version 2 default_is_stmt 1} lines_label {
	include_dir "${srcdir}/${subdir}"
	file_name "$srcfile3" 1
	file_name "$srcfile4" 1

	set f1_l1 [gdb_get_line_number "caller: before call" $srcfile3]
	set f1_l2 [gdb_get_line_number "caller: the call" $srcfile3]
	set f1_l3 [gdb_get_line_number "caller: after call" $srcfile3]

	set f2_l1 [gdb_get_line_number "callee: body" $srcfile4]

	program {
	    {DW_LNE_set_address line_label_1}
	    {line $f1_l1}
	    {DW_LNS_copy}

	    {line ${f1_l2}}
	    {DW_LNS_copy}

	    {DW_LNS_set_file 2}
	    {line ${f2_l1}}
	    {DW_LNS_copy}

	    {DW_LNS_negate_stmt}
	    {DW_LNS_copy}

	    {DW_LNS_set_file 1}
	    {DW_LNE_set_address line_label_2}
	    {line ${f1_l3}}
	    {DW_LNS_copy}

	    {DW_LNE_set_address line_label_3}
	    {DW_LNS_copy}
	    {DW_LNE_end_sequence}
	}
    }
}

if { [prepare_for_testing "failed to prepare" ${testfile} \
	  [list $srcfile $asm_file] {nodebug optimize=-O1}] } {
    return -1
}

if ![runto_main] {
    return -1
}

# Delete all breakpoints so that the output of "info breakpoints"
# below will only contain a single breakpoint.
delete_breakpoints

# Place a breakpoint within the function in the header file.
set linenum [gdb_get_line_number "callee: body" $srcfile4]
gdb_breakpoint "${srcfile4}:${linenum}"

# Check that the breakpoint was placed where we expected.  It should
# appear at the requested line.  When the bug in GDB was present the
# breakpoint would be placed on one of the following lines instead.
gdb_test "info breakpoints" \
    ".* in callee at \[^\r\n\]+${srcfile4}:${linenum}\\y.*"