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# Copyright 2018-2020 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
# 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 <>.
# Check whether we can determine the size of an optimized-out vla.
# The EXE_SUFFIX is a string appended to the name of the test binary
# to make it unique per variation.
# The OPTIONS is a two item list, the first item is a list of compiler
# flags used for building the test binary, and the second item is a
# pattern which matches some expected output within this proc.
proc vla_optimized_out {exe_suffix options} {
global testfile srcfile
lassign $options compile_flags sizeof_result
if { [prepare_for_testing "failed to prepare" "$testfile-$exe_suffix" $srcfile \
$compile_flags] } {
return -1
if ![runto f1] {
fail "can't run to f1"
gdb_test "p a" \
" = <optimized out>" \
"printed optimized out vla"
gdb_test "p sizeof (a)" \
" = $sizeof_result" \
"printed size of optimized out vla"
# At lower optimisation levels, the upper bound of the array is
# still defined, it's just the loctaion that tells GDB the array
# is optimised out. In that case, when we access an element that
# is within the bounds of the array an answer of '<optimized out>'
# is reasonable.
# At higher optimisation levels, the array bounds themselves have
# been removed. As such GDB can't be expected to know if the
# array contains _any_ elements at all. It seems reasonable in
# that case to reply with 'no such vector element'.
gdb_test "p a\[0\]" \
"(= <optimized out>|no such vector element)" \
"print out of range element of vla (0)"
gdb_test "p a\[6\]" \
"no such vector element" \
"print out of range element of vla (6)"
gdb_test "p a\[0xffffffff\]" \
"no such vector element" \
"print out of range element of vla (0xffffffff)"
foreach {test_prefix options} \
{ "o1" {{debug optimize=-O1 additional_flags=-DNOCLONE} "6"} \
"o3" {{debug optimize=-O3} "<optimized out>|6"} \
"o3_strict" {{debug optimize=-O3 \
additional_flags=-gstrict-dwarf} \
"<optimized out>|6"}} {
with_test_prefix $test_prefix {
vla_optimized_out $test_prefix $options