gdb/testsuite/gdb.dwarf2/missing-type-name.exp

# Copyright 2018-2021 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 tests some non-standard DWARF that we still expect GDB to be
# able to handle.
#
# The DWARF standard (v5 5.1) says this:
#
#     A base type is represented by a debugging information entry with
#     the tag DW_TAG_base_type.
#
#     A base type entry may have a DW_AT_name attribute whose value is
#     a null-terminated string containing the name of the base type as
#     recognized by the programming language of the compilation unit
#     containing the base type entry.
#
# So the DW_AT_name field for a DW_TAG_base_type is optional.  This
# test provides some basic checking that GDB doesn't crash when
# presented with this situation.

load_lib dwarf.exp

# This test can only be run on targets which support DWARF-2 and use gas.
if {![dwarf2_support]} {
    return 0
}

standard_testfile void-type.c void-type.S

# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    global srcfile

    cu {} {
	DW_TAG_compile_unit {
	        {DW_AT_producer "GNU C 8.1"}
                {DW_AT_language @DW_LANG_C}
                {DW_AT_name     $srcfile}
                {DW_AT_comp_dir /tmp}
        } {
	    declare_labels main_type int_type ptr_type

	    main_type: DW_TAG_base_type {
		{DW_AT_byte_size 4 DW_FORM_sdata}
		{DW_AT_encoding  @DW_ATE_signed}
	    }

	    int_type: DW_TAG_base_type {
		{DW_AT_byte_size 0 DW_FORM_sdata}
		{DW_AT_encoding  @DW_ATE_signed}
	    }

	    ptr_type: DW_TAG_pointer_type {
		{DW_AT_type :$int_type}
	    }

            DW_TAG_subprogram {
                {MACRO_AT_func func}
                {type :$int_type}
	    }
            DW_TAG_subprogram {
                {MACRO_AT_func main}
                {type :$main_type}
	    }

	    DW_TAG_variable {
		{DW_AT_name "var_a"}
		{DW_AT_type :$main_type}
		{DW_AT_external 1 DW_FORM_flag}
		{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_a"]} SPECIAL_expr}
	    }

	    DW_TAG_variable {
		{DW_AT_name "var_ptr"}
		{DW_AT_type :$ptr_type}
		{DW_AT_external 1 DW_FORM_flag}
		{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_ptr"]} SPECIAL_expr}
	    }
	}
    }
}

if { [prepare_for_testing "failed to prepare" ${testfile} \
	  [list $srcfile $asm_file] {nodebug}] } {
    return -1
}

if ![runto_main] {
    return -1
}

# Use 'ptype' on two variables that are using DW_TAG_base_type types
# with missing DW_AT_name attributes.
gdb_test "ptype var_ptr" "type = <invalid type code $decimal> \\*" \
    "ptype of a pointer to a basic type with missing name"

gdb_test "ptype var_a" "type = <invalid type code $decimal>" \
    "ptype of a variable that is a basic type with a missing name"