testsuite/gdb.mi/mi-var-invalidate-shlib.exp

# Copyright 2007-2023 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/>.
#
# Test that varobj are invalidated after the shlib they point to goes
# away.


load_lib mi-support.exp
set MIFLAGS "-i=mi"

if { [skip_shlib_tests] } {
    return 0
}

standard_testfile .c -lib.c
set shlib_path [standard_output_file ${testfile}-lib.so]

if { [gdb_compile_shlib $srcdir/$subdir/$srcfile2 $shlib_path {debug}] != "" } {
    untested "failed to compile"
    return -1
}


set opts [list shlib_load debug additional_flags=-DSHLIB_PATH="${shlib_path}"]
if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $opts] != "" } {
    untested "failed to compile"
    return -1
}

proc do_test { separate_debuginfo } {
    if { [mi_clean_restart] } {
	unsupported "failed to start GDB"
	return
    }

    # Start the process once and create varobjs referencing the loaded objfiles.
    with_test_prefix "setup" {
	mi_load_shlibs $::shlib_path
	if { $separate_debuginfo } {
	    mi_load_shlibs ${::shlib_path}.debug
	}
	mi_delete_breakpoints
	mi_gdb_reinitialize_dir $::srcdir/$::subdir
	mi_gdb_load $::binfile

	mi_runto foo -pending

	mi_create_varobj global_var global_var "create global global_var"
	mi_create_varobj global_shlib_var global_shlib_var "create global gloal_shlib_var"
	mi_create_floating_varobj floating_local local_var "create floating local_var"

	# Advance to a point where the shlib's objfile have been deleted.
	mi_continue_to "no_varobj_in_scope"
    }

    with_test_prefix "after objfile deleted" {
	# The global shlib var was invalidated when the objfile got unloaded.
	mi_gdb_test "-var-update global_shlib_var" \
	    "\\^done,changelist=\\\[\{name=\"global_shlib_var\",in_scope=\"invalid\",has_more=\"0\"\}\]" \
	    "global_shlib_var invalidated"

	# The floating var is still valid but not in scope.
	mi_gdb_test "-var-update floating_local" \
	    "\\^done,changelist=\\\[{name=\"floating_local\",in_scope=\"false\",type_changed=\"false\",has_more=\"0\"}\\\]" \
	    "floating_local still valid but not in scope"

	mi_gdb_test "-var-update global_var" \
	    "\\^done,changelist=\\\[\\\]" \
	    "global_var still valid"

	# The varobj can be re-evaluated if the expression is valid in the current
	# frame.
	mi_continue_to "floating_varobj_in_scope"
	mi_gdb_test "-var-update floating_local" \
	    "\\^done,changelist=\\\[{name=\"floating_local\",in_scope=\"true\",type_changed=\"true\",new_type=\"int\",new_num_children=\"0\",has_more=\"0\"}\\\]" \
	    "floating_local in scope with new type and value"
    }

    # Reload the entire process
    with_test_prefix "restart process" {
	mi_delete_breakpoints
	mi_gdb_load ${::binfile}
	mi_runto_main
    }

    with_test_prefix "in new process" {
	# When reloading the symbol file, only the var for the global in the main
	# executable is re-created.
	mi_gdb_test "-var-update global_var" \
	    "\\^done,changelist=\\\[\\\]" \
	    "global_var recreated"
	mi_gdb_test "-var-update global_shlib_var" \
	    "\\^done,changelist=\\\[{name=\"global_shlib_var\",in_scope=\"invalid\",has_more=\"0\"}\\\]" \
	    "global_shlib_var invalid"

	# Floating varobj should still be valid, but out of scope at the moment.
	mi_gdb_test "-var-update floating_local" \
	    "\\^done,changelist=\\\[{name=\"floating_local\",in_scope=\"false\",type_changed=\"false\",has_more=\"0\"}\\\]" \
	    "floating_local still valid but not in scope"

	# Continue inside foo
	mi_gdb_test "299-break-insert -f -t foo" \
	    "&\"Function \\\\\"foo\\\\\" not defined.\\\\n\"\r\n299\\^done,[mi_make_breakpoint_pending -type breakpoint -disp del -pending foo]"
	mi_send_resuming_command "exec-continue" "continue to foo"
	mi_expect_stop "breakpoint-hit" foo ".*" ".*" "\[0-9\]+" { "" "disp=\"del\"" } "arrived at foo"

	# Floating varobj is still valid, and now in scope.
	mi_gdb_test "-var-update floating_local" \
	    "\\^done,changelist=\\\[{name=\"floating_local\",in_scope=\"true\",type_changed=\"true\",new_type=\"struct bar\",new_num_children=\"2\",has_more=\"0\"}\\\]" \
	    "floating_local still valid and in scope"

	# The var for the global in the shlib stays invalid even after reloading the shlib.
	mi_gdb_test "-var-update global_shlib_var" \
	    "\\^done,changelist=\\\[{name=\"global_shlib_var\",in_scope=\"invalid\",has_more=\"0\"}\\\]" \
	    "global_shlib_var invalid after shlib loaded"
    }
}

proc_with_prefix local_not_invalidated { separate_debuginfo } {
    if { [mi_clean_restart] } {
	unsupported "failed to start GDB"
	return
    }

    # Start the process once and create varobjs referencing the loaded objfiles.
    with_test_prefix "setup" {
	mi_load_shlibs $::shlib_path
	if { $separate_debuginfo } {
	    mi_load_shlibs ${::shlib_path}.debug
	}

	mi_gdb_reinitialize_dir $::srcdir/$::subdir
	mi_gdb_load $::binfile

	mi_runto foo -pending
	mi_next "next"
	mi_create_varobj local_var local_var "create local varobj"
    }

    # At this point we are stopped in the shared library.  If we reload symbols
    # for the main binary, symbols for the shared library remain valid.  A
    # varobj tracking variables in the scope of the shared library only should
    # not be invalidated.
    mi_gdb_load ${::binfile}
    mi_gdb_test "-var-update local_var" \
	"\\^done,changelist=\\\[\\\]" \
	"local_var preserved"
}

foreach_with_prefix separate_debuginfo {0 1} {
    if { $separate_debuginfo } {
	gdb_gnu_strip_debug $::shlib_path
    }

    do_test $separate_debuginfo
    local_not_invalidated $separate_debuginfo
}