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# Copyright 2020-2023 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.
require dwarf2_support
# The .c files use __attribute__.
require is_c_compiler_gcc
standard_testfile .c .S
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
global srcdir subdir srcfile
declare_labels lines_label
get_func_info main
cu {} {
compile_unit {
{language @DW_LANG_C}
{name dw2-is-stmt.c}
{low_pc 0 addr}
{stmt_list ${lines_label} DW_FORM_sec_offset}
} {
subprogram {
{external 1 flag}
{name main}
{low_pc $main_start addr}
{high_pc "$main_start + $main_len" addr}
} {}
}
}
lines {version 2 default_is_stmt 1} lines_label {
include_dir "${srcdir}/${subdir}"
file_name "$srcfile" 1
program {
DW_LNE_set_address main
line [gdb_get_line_number "main prologue"]
DW_LNS_copy
DW_LNE_set_address line_label_0
line [gdb_get_line_number "main start"]
DW_LNS_copy
DW_LNE_set_address line_label_1
line [gdb_get_line_number "Line 1"]
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_2
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_3
line [gdb_get_line_number "Line 2"]
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_4
line [gdb_get_line_number "Line 1"]
DW_LNS_copy
DW_LNE_set_address line_label_5
line [gdb_get_line_number "Line 3"]
DW_LNS_copy
DW_LNE_set_address line_label_6
line [gdb_get_line_number "Line 4"]
DW_LNS_copy
DW_LNE_set_address line_label_7
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_8
line [gdb_get_line_number "Line 2"]
DW_LNS_copy
DW_LNE_set_address line_label_9
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_10
line [gdb_get_line_number "Line 3"]
DW_LNS_copy
DW_LNE_set_address line_label_11
line [gdb_get_line_number "Line 5"]
DW_LNS_copy
DW_LNE_set_address line_label_12
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_13
line [gdb_get_line_number "Line 3"]
DW_LNS_copy
DW_LNE_set_address line_label_14
line [gdb_get_line_number "Line 4"]
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address line_label_15
line [gdb_get_line_number "Line 5"]
DW_LNS_copy
DW_LNE_set_address line_label_16
line [gdb_get_line_number "main end"]
DW_LNS_negate_stmt
DW_LNS_copy
DW_LNE_set_address ${main_end}
DW_LNE_end_sequence
}
}
}
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
if ![runto_main] {
return -1
}
# Check stepping through the out of order lines gives the experience
# we expect; lines in the correct order, and stop at the correct
# labels.Q
set locs { { "Line 1." "line_label_2" } \
{ "Line 4." "line_label_7" } \
{ "Line 2." "line_label_8" } \
{ "Line 5." "line_label_12" } \
{ "Line 3." "line_label_13" } }
foreach entry $locs {
set pattern [lindex $entry 0]
set label [lindex $entry 1]
set linum [gdb_get_line_number "$pattern"]
gdb_test "step" "\r\n$linum\[ \t\]+/\\* $pattern \\*/" \
"step to $pattern"
set pc [get_hexadecimal_valueof "\$pc" "NO-PC" \
"read \$pc at $pattern"]
set val [get_hexadecimal_valueof "&${label}" "INVALID"]
gdb_assert { $pc == $val } \
"check pc at $pattern"
}
# Now restart the test, and this time, single instruction step
# through. This is checking that the is-stmt marked lines are
# displayed differently (without addresses) to addresses that are
# mid-way through a line, or not marked as is-stmt.
clean_restart $binfile
runto_main
foreach entry $locs {
set pattern [lindex $entry 0]
set label [lindex $entry 1]
with_test_prefix "stepi to $label" {
# If can take many instruction steps to get to the next label.
set i 0
set pc [get_hexadecimal_valueof "\$pc" "NO-PC" ]
set val [get_hexadecimal_valueof "&${label}" "INVALID"]
while { $pc < $val } {
incr i
set line_changed -1
gdb_test_multiple "stepi" "stepi $i" {
-re "\r\n$hex\[ \t\]+$decimal\[^\r\n\]+\r\n$gdb_prompt" {
set line_changed 0
}
-re "\r\n$decimal\[ \t\]+/\\* $pattern \\*/\r\n$gdb_prompt" {
set line_changed 1
}
}
gdb_assert { $line_changed != -1 } \
"ensure we saw a valid pattern, $i"
set pc [get_hexadecimal_valueof "\$pc" "NO-PC" \
"get pc inside stepi loop, $i"]
if { $pc == $val } {
gdb_assert { $line_changed } \
"line must change at $label"
} else {
gdb_assert { !$line_changed } "same line $i"
}
}
}
}
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