gdb/testsuite/gdb.base/vla-sideeffect.exp

# Copyright 2014-2021 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/>.

# Tests side-effects of sizeof evaluation.
# Based on gcc/testsuite/gcc.dg/vla-4.c; vla-15.c

standard_testfile

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

if ![runto_main] {
    return -1
}

gdb_breakpoint [gdb_get_line_number "vla-filled"]
gdb_continue_to_breakpoint "vla-filled"

# Check side effects for sizeof argument.
set sizeof_int [get_sizeof "int" 4]
set sizeof_vla [ expr "10" * "$sizeof_int" ]

gdb_test "print sizeof (vla1\[i++\])" " = ${sizeof_int}"
gdb_test "print i" " = 0" \
         "print i - sizeof no side effects"

gdb_test "print sizeof (++vla1\[0\])" " = ${sizeof_int}"
gdb_test "print vla1\[0\]" " = 10" \
         "print vla1\[0\] - sizeof no side effects"

gdb_test "ptype ++vla1\[0\]" "type = int"
gdb_test "print vla1\[0\]" " = 10" \
         "print vla1\[0\] - ptype no side effects"

gdb_test "whatis ++vla1\[0\]" "type = int"
gdb_test "print vla1\[0\]" " = 10" \
         "print vla1\[0\] - whatis no side effects"


gdb_test "print sizeof (vla2\[i++\])" " = ${sizeof_vla}"
gdb_test "print i" " = 1" \
         "print i - sizeof with side effects (1)"

gdb_test "print sizeof (vla2\[i++ + sizeof(j++)\])" " = ${sizeof_vla}"
gdb_test "print i" " = 2" \
         "print i - sizeof with side effects (2)"
gdb_test "print j" " = 0" \
         "print j - sizeof with no side effects"

gdb_test "ptype vla2\[i++\]" "type = int \\\[10\\\]"
gdb_test "print i" " = 2" \
         "print i - ptype with side effects (1)"

gdb_test "ptype vla2\[i++ + sizeof(j++)\]" "type = int \\\[10\\\]"
gdb_test "print i" " = 2" \
         "print i - ptype with side effects (2)"
gdb_test "print j" " = 0" \
         "print j - ptype with no side effects"

gdb_test "whatis vla2\[i++\]" "type = int \\\[10\\\]"
gdb_test "print i" " = 2" \
         "print i - whatis with side effects (1)"

gdb_test "whatis vla2\[i++ + sizeof(j++)\]" "type = int \\\[10\\\]"
gdb_test "print i" " = 2" \
         "print i - whatis with side effects (2)"
gdb_test "print j" " = 0" \
         "print j - whatis with no side effects"