testsuite/gdb.python/py-missing-debug.exp

# Copyright (C) 2023-2024 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/>.

load_lib gdb-python.exp

require allow_python_tests

standard_testfile

if {[build_executable "failed to prepare" ${testfile} ${srcfile}]} {
    return -1
}

# Remove debug information from BINFILE and place it into
# BINFILE.debug.
if {[gdb_gnu_strip_debug $binfile]} {
    unsupported "cannot produce separate debug info files"
    return -1
}

set remote_python_file \
    [gdb_remote_download host ${srcdir}/${subdir}/${testfile}.py]

set debug_filename ${binfile}.debug
set hidden_filename ${binfile}.hidden

# Start GDB.
clean_restart

# Some initial sanity checks; initially, we can find the debug information
# (this will use the .gnu_debuglink), then after we move the debug
# information, reload the executable, now the debug can't be found.
with_test_prefix "initial checks" {
    # Load BINFILE, we should find the separate debug information.
    gdb_file_cmd $binfile
    gdb_assert {$gdb_file_cmd_debug_info == "debug"} \
	"debug info is found"

    # Rename the debug information file, re-load BINFILE, GDB should fail
    # to find the debug information
    remote_exec build "mv $debug_filename $hidden_filename"
    gdb_file_cmd $binfile
    gdb_assert {$gdb_file_cmd_debug_info == "nodebug"} \
	"debug info no longer found"
}

# Load the Python script into GDB.
gdb_test "source $remote_python_file" "^Success" \
    "source python script"

# Setup the separate debug info directory.  This isn't actually needed until
# some of the later tests, but might as well get this done now.
set debug_directory [standard_output_file "debug-dir"]
remote_exec build "mkdir -p $debug_directory"
gdb_test_no_output "set debug-file-directory $debug_directory" \
    "set debug-file-directory"

# Initially the missing debug handler we install is in a mode where it
# returns None, indicating that it can't help locate the debug information.
# Check this works as expected.
with_test_prefix "handler returning None" {
    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(None, handler_obj)" \
	"register the initial handler"

    gdb_file_cmd $binfile
    gdb_assert {$gdb_file_cmd_debug_info == "nodebug"} \
	"debug info not found"

    # Check the handler was only called once.
    gdb_test "python print(handler_obj.call_count)" "^1" \
	"check handler was only called once"
}

# Now configure the handler to move the debug file back to the
# .gnu_debuglink location and then return True, this will cause GDB to
# recheck, at which point it should find the debug info.
with_test_prefix "handler in gnu_debuglink mode" {
    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_TRUE, \
						    \"$hidden_filename\", \
						    \"$debug_filename\")" \
	"confirgure handler"
    gdb_file_cmd $binfile
    gdb_assert {$gdb_file_cmd_debug_info == "debug"} "debug info found"

    # Check the handler was only called once.
    gdb_test "python print(handler_obj.call_count)" "^1" \
	"check handler was only called once"
}

# Setup a directory structure based on the build-id of BINFILE, but don't
# move the debug information into place just yet.
#
# Instead, configure the handler to move the debug info into the build-id
# directory.
#
# Reload BINFILE, at which point the handler will move the debug info into
# the build-id directory and return True, GDB will then recheck for the
# debug information, and should find it.
with_test_prefix "handler in build-id mode" {
    # Move the debug file out of the way once more.
    remote_exec build "mv $debug_filename $hidden_filename"

    # Create the build-id based directory in which the debug information
    # will be placed.
    set build_id_filename \
	$debug_directory/[build_id_debug_filename_get $binfile]
    remote_exec build "mkdir -p [file dirname $build_id_filename]"

    # Configure the handler to move the debug info into the build-id dir.
    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_TRUE, \
						    \"$hidden_filename\", \
						    \"$build_id_filename\")" \
	"confirgure handler"

    # Reload the binary and check the debug information is found.
    gdb_file_cmd $binfile
    gdb_assert {$gdb_file_cmd_debug_info == "debug"} "debug info found"

    # Check the handler was only called once.
    gdb_test "python print(handler_obj.call_count)" "^1" \
	"check handler was only called once"
}

# Move the debug information back to a hidden location and configure the
# handler to return the filename of the hidden debug info location.  GDB
# should immediately use this file as the debug information.
with_test_prefix "handler returning a string" {
    remote_exec build "mv $build_id_filename $hidden_filename"

    # Configure the handler return a filename string.
    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_STRING, \
						    \"$hidden_filename\")" \
	"confirgure handler"

    # Reload the binary and check the debug information is found.
    gdb_file_cmd $binfile
    gdb_assert {$gdb_file_cmd_debug_info == "debug"} "debug info found"

    # Check the handler was only called once.
    gdb_test "python print(handler_obj.call_count)" "^1" \
	"check handler was only called once"
}

# Register another global handler, this one raises an exception.  Reload the
# debug information, the bad handler should be invoked first, which raises
# an excetption, at which point GDB should skip further Python handlers.
with_test_prefix "handler raises an exception" {
    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(None, rhandler)"

    foreach_with_prefix exception_type {gdb.GdbError TypeError} {
	gdb_test_no_output \
	    "python rhandler.exception_type = $exception_type"

	gdb_file_cmd $binfile
	gdb_assert {$gdb_file_cmd_debug_info == "nodebug"} \
	    "debug info not found"

	set re [string_to_regexp \
		    "Python Exception <class '$exception_type'>: message"]
	gdb_assert {[regexp $re $gdb_file_cmd_msg]} \
	    "check for exception in file command output"

	# Our original handler is still registered, but should not have been
	# called again (as the exception occurs first).
	gdb_test "python print(handler_obj.call_count)" "^1" \
	    "check good handler hasn't been called again"
    }
}

gdb_test "info missing-debug-handlers" \
    [multi_line \
	 "Global:" \
	 "  exception_handler" \
	 "  handler"] \
    "check both handlers are visible"

# Re-start GDB.
clean_restart

# Load the Python script into GDB.
gdb_test "source $remote_python_file" "^Success" \
    "source python script for bad handler name checks"

# Attempt to register a missing-debug-handler with NAME.  The expectation is
# that this should fail as NAME contains some invalid characters.
proc check_bad_name {name} {
    set name_re [string_to_regexp $name]
    set re \
	[multi_line \
	     "ValueError.*: invalid character '.' in handler name: $name_re" \
	     "Error occurred in Python.*"]

    gdb_test "python register(\"$name\")" $re \
	"check that '$name' is not accepted"
}

# We don't attempt to be exhaustive here, just check a few random examples
# of invalid names.
check_bad_name "!! Bad Name"
check_bad_name "Bad Name"
check_bad_name "(Bad Name)"
check_bad_name "Bad \[Name\]"
check_bad_name "Bad,Name"
check_bad_name "Bad;Name"

# Check that there are no handlers registered.
gdb_test_no_output "info missing-debug-handlers" \
    "check no handlers are registered"

# Check we can use the enable/disable commands where there are no handlers
# registered.
gdb_test "enable missing-debug-handler foo" \
    "^0 missing debug handlers enabled"
gdb_test "disable missing-debug-handler foo" \
    "^0 missing debug handlers disabled"

# Grab the current program space object, used for registering handler later.
gdb_test_no_output "python pspace = gdb.selected_inferior().progspace"

# Now register some handlers.
foreach hspec {{\"Foo\" None}
    {\"-bar\" None}
    {\"baz-\" pspace}
    {\"abc-def\" pspace}} {
    lassign $hspec name locus
    gdb_test "python register($name, $locus)"
}

with_test_prefix "all handlers enabled" {
    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Current Progspace:" \
	     "  abc-def" \
	     "  baz-" \
	     "Global:" \
	     "  -bar" \
	     "  Foo"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', 'baz-', '-bar', 'Foo']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

with_test_prefix "disable 'baz-'" {
    gdb_test "disable missing-debug-handler progspace baz-" \
	"^1 missing debug handler disabled"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  abc-def" \
	     "  baz- \\\[disabled\\\]" \
	     "Global:" \
	     "  -bar" \
	     "  Foo"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', '-bar', 'Foo']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

with_test_prefix "disable 'Foo'" {
    gdb_test "disable missing-debug-handler .* Foo" \
	"^1 missing debug handler disabled"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  abc-def" \
	     "  baz- \\\[disabled\\\]" \
	     "Global:" \
	     "  -bar" \
	     "  Foo \\\[disabled\\\]"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', '-bar']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

with_test_prefix "disable everything" {
    gdb_test "disable missing-debug-handler .* .*" \
	"^2 missing debug handlers disabled"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  abc-def \\\[disabled\\\]" \
	     "  baz- \\\[disabled\\\]" \
	     "Global:" \
	     "  -bar \\\[disabled\\\]" \
	     "  Foo \\\[disabled\\\]"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {[]}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

with_test_prefix "enable 'abc-def'" {
    set re [string_to_regexp $binfile]

    gdb_test "enable missing-debug-handler \"$re\" abc-def" \
	"^1 missing debug handler enabled" \
	"enable missing-debug-handler"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  abc-def" \
	     "  baz- \\\[disabled\\\]" \
	     "Global:" \
	     "  -bar \\\[disabled\\\]" \
	     "  Foo \\\[disabled\\\]"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

with_test_prefix "enable global handlers" {
    set re [string_to_regexp $binfile]

    gdb_test "enable missing-debug-handler global" \
	"^2 missing debug handlers enabled"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  abc-def" \
	     "  baz- \\\[disabled\\\]" \
	     "Global:" \
	     "  -bar" \
	     "  Foo"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', '-bar', 'Foo']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

# Add handler_obj to the global handler list, and configure it to
# return False.  We should call all of the program space specific
# handlers (which return None), and then call handler_obj from the
# global list, which returns False, at which point we shouldn't call
# anyone else.
with_test_prefix "return False handler in progspace list" {
    gdb_test "enable missing-debug-handler progspace" \
	"^1 missing debug handler enabled"

    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(None, handler_obj)" \
	"register the initial handler"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  abc-def" \
	     "  baz-" \
	     "Global:" \
	     "  handler" \
	     "  -bar" \
	     "  Foo"]

    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_FALSE)" \
	"confirgure handler"

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', 'baz-', 'handler']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

# Now add handler_obj to the current program space's handler list.  We
# use the same handler object here, that's fine.  We should only see a
# call to the first handler object in the call log.
with_test_prefix "return False handler in global list" {
    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(pspace, handler_obj)" \
	"register the initial handler"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  handler" \
	     "  abc-def" \
	     "  baz-" \
	     "Global:" \
	     "  handler" \
	     "  -bar" \
	     "  Foo"]

    gdb_file_cmd $binfile
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['handler']}]
    gdb_test_no_output "python handler_call_log = \[\]" \
	"reset call log"
}

with_test_prefix "check handler replacement" {
    # First, check we can have the same name appear in both program
    # space and global lists without giving an error.
    gdb_test_no_output "python register(\"Foo\", pspace)"

    gdb_test "info missing-debug-handlers" \
	[multi_line \
	     "Progspace \[^\r\n\]+:" \
	     "  Foo" \
	     "  handler" \
	     "  abc-def" \
	     "  baz-" \
	     "Global:" \
	     "  handler" \
	     "  -bar" \
	     "  Foo"]

    # Now check that we get an error if we try to add a handler with
    # the same name.
    gdb_test "python gdb.missing_debug.register_handler(pspace, log_handler(\"Foo\"))" \
	[multi_line \
	     "RuntimeError.*: Handler Foo already exists\\." \
	     "Error occurred in Python.*"]

    gdb_test "python gdb.missing_debug.register_handler(handler=log_handler(\"Foo\"), locus=pspace)" \
	[multi_line \
	     "RuntimeError.*: Handler Foo already exists\\." \
	     "Error occurred in Python.*"]

    # And now try again, but this time with 'replace=True', we
    # shouldn't get an error in this case.
    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(pspace, log_handler(\"Foo\"), replace=True)"

    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(handler=log_handler(\"Foo\"), locus=None, replace=True)"

    # Now disable a handler and check we still need to use 'replace=True'.
    gdb_test "disable missing-debug-handler progspace Foo" \
	"^1 missing debug handler disabled"

    gdb_test "python gdb.missing_debug.register_handler(pspace, log_handler(\"Foo\"))" \
	[multi_line \
	     "RuntimeError.*: Handler Foo already exists\\." \
	     "Error occurred in Python.*"] \
	"still get an error when handler is disabled"

    gdb_test_no_output \
	"python gdb.missing_debug.register_handler(pspace, log_handler(\"Foo\"), replace=True)" \
	"can replace a disabled handler"
}