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# Copyright 2020-2022 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 issue PR gdb/27059. The problem was that when resolving a
# dynamic type that was not-allocated GDB would still try to execute
# the DWARF expressions for the upper, lower, and byte-stride values.
#
# The problem is that, at least in some gfortran compiled programs,
# these values are undefined until the array is allocated.
#
# As a result, executing the dwarf expressions was triggering integer
# overflow in some cases.
#
# This test aims to make the sometimes occurring integer overflow a
# more noticeable error by creating an array that is always marked as
# not-allocated.
#
# The dwarf expressions for the various attributes then contains an
# infinite loop. If GDB ever tries to execute these expressions we
# will get a test timeout. With this issue fixed the expressions are
# never executed and the test completes as we'd expect.
load_lib dwarf.exp
if {![dwarf2_support]} {
return 0
}
standard_testfile .c -dw.S
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
return -1
}
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
cu {} {
global srcfile
compile_unit {
{producer "gcc" }
{language @DW_LANG_Fortran90}
{name ${srcfile}}
{low_pc 0 addr}
} {
declare_labels array_type_label integer_type_label
set int_size [get_sizeof "int" "UNKNOWN"]
set voidp_size [get_sizeof "void *" "UNKNOWN"]
integer_type_label: DW_TAG_base_type {
{DW_AT_byte_size $int_size DW_FORM_sdata}
{DW_AT_encoding @DW_ATE_signed}
{DW_AT_name integer}
}
array_type_label: DW_TAG_array_type {
{DW_AT_type :$integer_type_label}
{DW_AT_data_location {
DW_OP_push_object_address
DW_OP_deref
} SPECIAL_expr}
{DW_AT_allocated {
DW_OP_lit0
} SPECIAL_expr}
} {
DW_TAG_subrange_type {
{DW_AT_type :$integer_type_label}
{DW_AT_lower_bound {
DW_OP_skip -3
} SPECIAL_expr}
{DW_AT_upper_bound {
DW_OP_skip -3
} SPECIAL_expr}
{DW_AT_byte_stride {
DW_OP_skip -3
} SPECIAL_expr}
}
}
DW_TAG_variable {
{DW_AT_location {
DW_OP_addr [gdb_target_symbol dyn_object]
} SPECIAL_expr}
{name "dyn_object"}
{type :$array_type_label}
}
subprogram {
{external 1 flag}
{MACRO_AT_func {main}}
}
}
}
}
if { [prepare_for_testing "failed to prepare" "${testfile}" \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
if ![runto_main] {
return -1
}
gdb_breakpoint "marker_label"
gdb_continue_to_breakpoint "stop at marker_label"
gdb_test "ptype dyn_object" "type = integer, allocatable \\(:\\)"
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