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# Copyright (C) 2020-2024 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 for PR tui/25126.
#
# The bug is about a regression that makes GDB not reload its source
# code cache when the inferior's symbols are reloaded, which leads to
# wrong backtraces/listings.
#
# This bug is reproducible even without using the TUI.
standard_testfile
# Only run on native boards.
require !use_gdb_stub
if { [target_info gdb_protocol] == "extended-remote" } {
return -1
}
# Because we need to modify the source file later, it's better if we
# just copy it to our output directory (instead of messing with the
# user's source directory).
set newsrc [standard_output_file $testfile].c
file copy -force -- $srcdir/$subdir/$srcfile $newsrc
set srcfile $newsrc
if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
return -1
}
# Get the line number for the line with the "break-here" marker.
set bp_line [gdb_get_line_number "break-here" $srcfile]
gdb_assert { [runto "$srcfile:$bp_line"] } \
"run to break-here marker"
# Do a "list" and check that the printed line matches the line of the
# original source file.
gdb_test_no_output "set listsize 1"
gdb_test "list" "$bp_line\[ \t\]+printf \\(\"hello\\\\n\"\\); /\\* break-here \\*/" \
"check the first version of the source file"
# Modify the original source file, and add an extra line into it.
# This only works locally because of the TCL commands.
set bkpsrc [standard_output_file $testfile].c.bkp
set bkpsrcfd [open $bkpsrc w]
set srcfd [open $srcfile r]
while { [gets $srcfd line] != -1 } {
if { [string first "break-here" $line] != -1 } {
# Put a "printf" line before the "break-here" line.
puts $bkpsrcfd " printf (\"foo\\n\"); /* new-marker */"
}
puts $bkpsrcfd $line
}
close $bkpsrcfd
close $srcfd
file rename -force -- $bkpsrc $srcfile
# We have to wait 1 second because of the way GDB checks whether the
# binary has changed or not. GDB uses stat(2) and currently checks
# 'st_mtime', whose precision is measured in seconds. Since the copy,
# rename, and rebuild can take less than 1 second, GDB might mistakenly
# assume that the binary is unchanged.
sleep 1
# Recompile the modified source. We use "gdb_compile" here instead of
# "prepare_for_testing" because we don't want to call "clean_restart".
if { [gdb_compile "${srcfile}" "${binfile}" executable {debug}] != "" } {
return -1
}
# Rerun the program. This should not only force GDB to reload the
# source cache, but also to break at BP_LINE again, which now has
# different contents.
set q \
[multi_line \
"The program being debugged has been started already\\." \
"Start it from the beginning\\? \\(y or n\\) "]
set binregex [string_to_regexp $binfile]
set re \
[multi_line \
"\\`$binregex\\' has changed; re-reading symbols\\.(" \
"Expanding full symbols from $binfile\\.\\.\\.)?" \
"Starting program: ${binregex}.*"]
gdb_test "run" $re "rerun program" $q y
# Again, perform the listing and check that the line indeed has
# changed for GDB.
gdb_test "list" "${bp_line}\[ \t\]+printf \\(\"foo\\\\n\"\\); /\\\* new-marker \\\*/.*" \
"verify that the source code is properly reloaded"
# Modify the source file again. As before, this only works locally
# because of the TCL commands.
set bkpsrc [standard_output_file $testfile].c.bkp
set bkpsrcfd [open $bkpsrc w]
set srcfd [open $srcfile r]
while { [gets $srcfd line] != -1 } {
if { [string first "new-marker" $line] != -1 } {
# Modify the printf line that we added previously.
puts $bkpsrcfd " printf (\"foo\\n\"); /* new-marker updated */"
} else {
puts $bkpsrcfd $line
}
}
close $bkpsrcfd
close $srcfd
file rename -force -- $bkpsrc $srcfile
# As before, delay so that at least one second has passed. GDB still
# will not spot that the source file has changed, as GDB doesn't do a
# time check unless the binary has also changed, this delay just
# allows us to confirm this behavior.
sleep 1
# List the printf line again, we should not see the file changes yet
# as the binary is unchanged, so the cached contents will still be
# used.
gdb_test "list ${bp_line}" "${bp_line}\[ \t\]+printf \\(\"foo\\\\n\"\\); /\\\* new-marker \\\*/.*" \
"verify that the source code change is not seen yet"
gdb_test "maint flush source-cache" "Source cache flushed\\."
# List the printf line again. After the cache flush GDB will re-read
# the source file and we should now see the changes.
gdb_test "list ${bp_line}" "${bp_line}\[ \t\]+printf \\(\"foo\\\\n\"\\); /\\\* new-marker updated \\\*/.*" \
"verify that the updated source code change is not seen"
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