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

# Copyright (C) 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
require {!is_remote host}

standard_testfile .c -lib.c

# Build the library.
set libname ${testfile}-lib
set libfile [standard_output_file $libname]
if { [build_executable "build shlib" $libfile $srcfile2 \
	  {debug shlib build-id}] == -1} {
    return
}

# Build the executable.
set opts [list debug build-id shlib=${libfile}]
if { [build_executable "build exec" $binfile $srcfile $opts] == -1} {
    return
}

# The cc-with-gnu-debuglink board will split the debug out into the
# .debug directory.  This test script relies on having GDB lookup the
# objfile and debug via the build-id, which this test sets up.  Trying
# to do that, while also supporting the cc-with-gnu-debuglink board is
# just too complicated.
if {[file isdirectory [standard_output_file ".debug"]]} {
    unsupported "split debug testing not supported"
    return
}

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

# Generate a core file.
set corefile [core_find $binfile {}]
if {$corefile == ""} {
    unsupported "core file not generated"
    return 0
}

# Create a directory named DIRNAME for use as the
# debug-file-directory.  Populate the directory with links (based on
# the build-ids) to each file in the list FILES.
#
# Return the full filename of DIRNAME on the host.
proc setup_debugdir { dirname files } {
    set debugdir [host_standard_output_file $dirname]

    # Create basic empty directory structure (in case FILES is empty).
    remote_exec host "mkdir -p $debugdir/.build-id/"

    foreach file $files {
	set build_id_filename [build_id_debug_filename_get $file ""]

	remote_exec host "mkdir -p $debugdir/[file dirname $build_id_filename]"
	remote_exec host "ln -s $file $debugdir/$build_id_filename"
    }

    return $debugdir
}

# Query some symbols in the inferior to see if GDB managed to find the
# executable (when EXEC_LOADED is true) and/or the library (when LIB_LOADED
# is true).
proc check_loaded_debug { exec_loaded lib_loaded } {
    if { $exec_loaded } {
	gdb_test "whatis global_exec_var" "^type = volatile struct exec_type"

	if { $lib_loaded } {
	    gdb_test "whatis global_lib_var" "^type = volatile struct lib_type"
	} else {
	    gdb_test "whatis global_lib_var" \
		"^No symbol \"global_lib_var\" in current context\\."
	}
    } else {
	gdb_test "whatis global_exec_var" \
	    "^No symbol table is loaded\\.  Use the \"file\" command\\."
	gdb_test "whatis global_lib_var" \
	    "^No symbol table is loaded\\.  Use the \"file\" command\\."
    }
}

# Load the global corefile.  The EXTRA_RE is checked for prior to GDB
# announcing that the core-file has been loaded.
proc load_core_file { {extra_re ".*"} } {
    gdb_test "core-file $::corefile" \
	[multi_line \
	     "$extra_re" \
	     "Core was generated by \[^\r\n\]+" \
	     "Program terminated with signal SIGABRT, Aborted\\." \
	     "\[^\r\n\]+(?:\r\n\[^\r\n\]+)?"] \
	"loaded the core file"
}

# Set the debug-file-directory to DIRNAME.
proc set_debug_file_dir { dirname } {
    gdb_test_no_output "set debug-file-directory $dirname" \
	"set debug-file-directory"
}

# Restart GDB and load the support Python script.
proc clean_restart_load_python {} {
    clean_restart
    gdb_test "source $::remote_python_file" "^Success" \
	"load python script"
}

# For sanity, lets check that we can load the specify the executable
# and then load the core-file the easy way.
with_test_prefix "initial sanity check" {
    clean_restart $binfile
    load_core_file
    check_loaded_debug true true
}

# Move the executable and library into a location that the core-file
# can't possibly know about.  After this the only way GDB can track
# down these files will be by looking in the debug-file-directory.
set hidden_dir [host_standard_output_file "hidden"]
set hidden_binfile "$hidden_dir/$testfile"
set hidden_libfile "$hidden_dir/$libname"
remote_exec host "mkdir -p $hidden_dir"
remote_exec host "mv $libfile $hidden_libfile"
remote_exec host "mv $binfile $hidden_binfile"

# If using the fission-dwp board then we'll have .dwp files that also
# need to be moved.
if {[remote_file host exists ${libfile}.dwp]} {
    remote_exec host "mv ${libfile}.dwp ${hidden_libfile}.dwp"
}

if {[remote_file host exists ${binfile}.dwp]} {
    remote_exec host "mv ${binfile}.dwp ${hidden_binfile}.dwp"
}

with_test_prefix "no objfiles, no debug-file-directory" {
    clean_restart
    load_core_file
    check_loaded_debug false false
}

# Setup some debug-file-directories.
set debugdir_no_lib \
    [setup_debugdir "debugdir.no-lib" [list "$hidden_binfile"]]
set debugdir_empty \
    [setup_debugdir "debugdir.empty" {}]
set debugdir_all \
    [setup_debugdir "debugdir.all" [list "$hidden_libfile" \
					"$hidden_binfile"]]

with_test_prefix "no objfiles available" {
    # Another sanity check that GDB can find the files via the
    # debug-file-directory.
    clean_restart
    set_debug_file_dir $debugdir_empty
    load_core_file
    check_loaded_debug false false
}

with_test_prefix "all objfiles available" {
    # Another sanity check that GDB can find the files via the
    # debug-file-directory.
    set_debug_file_dir $debugdir_all
    load_core_file
    check_loaded_debug true true
}

with_test_prefix "lib objfile missing" {
    # Another sanity check that GDB can find the files via the
    # debug-file-directory.
    set_debug_file_dir $debugdir_no_lib
    load_core_file
    check_loaded_debug true false
}

with_test_prefix "all objfiles missing, handler returns None" {
    clean_restart_load_python
    gdb_test_no_output \
	"python gdb.missing_objfile.register_handler(None, handler_obj)" \
	"register initial handler"
    load_core_file

    check_loaded_debug false false

    # The handler should be called three times, once for the
    # mapped-file, once for the core-file's exec, and once for the
    # shared library.
    gdb_test "python print(handler_obj.call_count)" "^3" \
	"check handler was called three times"
}

with_test_prefix "lib objfile missing, handler returns None" {
    # Reset handler_obj.
    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_NONE)"

    set_debug_file_dir $debugdir_no_lib
    load_core_file
    check_loaded_debug true false

    # The handler will be called twice, once when GDB tries to
    # load the shared library during the memory-mapped file phase,
    # then again for the shared library loading.
    gdb_test "python print(handler_obj.call_count)" "^2" \
	"check handler was called three times"
}

with_test_prefix "handler installs lib objfile" {
    set build_id_filename [build_id_debug_filename_get \
				   $hidden_libfile ""]
    remote_exec host \
	"mkdir -p $debugdir_no_lib/[file dirname $build_id_filename]"
    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_TRUE, \
    	\"$hidden_libfile\", \"$debugdir_no_lib/$build_id_filename\")" \
	"configure handler"

    load_core_file
    check_loaded_debug true true

    # Cleanup so the test can be reproduced again later if needed.
    remote_exec host "rm $debugdir_no_lib/$build_id_filename"
}

with_test_prefix "handler points to lib objfile" {
    set build_id_filename [build_id_debug_filename_get \
			       $hidden_libfile ""]
    remote_exec host \
	"mkdir -p $debugdir_no_lib/[file dirname $build_id_filename]"
    gdb_test_no_output "python handler_obj.set_mode(Mode.RETURN_STRING, \
						\"$hidden_libfile\")" \
	"configure handler"

    load_core_file
    check_loaded_debug true true

    # Cleanup so the test can be reproduced again later if needed.
    remote_exec host "rm $debugdir_no_lib/$build_id_filename"

    # The handler will only have been called once when loading the
    # memory-mapped file.  GDB is smart enough to reuse the previously
    # discovered BFD object as the shared library.
    gdb_test "python print(handler_obj.call_count)" "^1" \
	"check good handler hasn't been called again"

    # Validate the filename and build-id arguments passed to the handler.
    set expected_buildid [get_build_id $hidden_libfile]
    gdb_test "python print(handler_last_buildid)" "^$expected_buildid"
    gdb_test "python print(handler_last_filename)" \
	"^[string_to_regexp $libfile]"
}

# Register another global handler, this one raises an exception.  Reload the
# core-file, 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_objfile.register_handler(None, rhandler)"

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

	# Load the core file.  We expect the exception message to appear at
	# least once in the output.
	set re [string_to_regexp \
		    "Python Exception <class '$exception_type'>: message"]
	load_core_file "${re}.*"

	# 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"
    }
}

# Re-start GDB.
clean_restart_load_python

# 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-objfile-handlers" \
    "check no handlers are registered"

# 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-objfile-handlers" \
	[multi_line \
	     "Current Progspace:" \
	     "  abc-def" \
	     "  baz-" \
	     "Global:" \
	     "  -bar" \
	     "  Foo"]

    set_debug_file_dir $debugdir_no_lib
    load_core_file

    # As we perform two look ups, first for the mapped-file then for the
    # shared library, each handler will be called twice.
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', 'baz-', '-bar', 'Foo', '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-objfile-handler progspace baz-" \
	"^1 missing objfile handler disabled"

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

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

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

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

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

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

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

    load_core_file
    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 $hidden_binfile]

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

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

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

with_test_prefix "enable global handlers" {
    gdb_test "enable missing-objfile-handler global" \
	"^2 missing objfile handlers enabled"

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

    load_core_file
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', '-bar', 'Foo', '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 global list" {
    gdb_test "enable missing-objfile-handler progspace" \
	"^1 missing objfile handler enabled"

    gdb_test_no_output \
	"python gdb.missing_objfile.register_handler(None, handler_obj)" \
	"register handler_obj in global list"

    gdb_test "info missing-objfile-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"

    load_core_file
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['abc-def', 'baz-', 'handler', '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 progspace list" {
    gdb_test_no_output \
	"python gdb.missing_objfile.register_handler(pspace, handler_obj)" \
	"register handler_obj in progspace list"

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

    load_core_file
    gdb_test "python print(handler_call_log)" \
	[string_to_regexp {['handler', '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-objfile-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_objfile.register_handler(pspace, log_handler(\"Foo\"))" \
	[multi_line \
	     "RuntimeError.*: Handler Foo already exists\\." \
	     "Error occurred in Python.*"]

    gdb_test "python gdb.missing_objfile.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_objfile.register_handler(pspace, log_handler(\"Foo\"), replace=True)"

    gdb_test_no_output \
	"python gdb.missing_objfile.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-objfile-handler progspace Foo" \
	"^1 missing objfile handler disabled"

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