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# This testcase is part of GDB, the GNU debugger.
# Copyright 1998-2021 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/>.
# Test GDB's ability to restore saved registers from stack frames
# when using the `return' command.
#
# This file was written by Jim Blandy <jimb@cygnus.com>, with
# fragments borrowed from return.exp.
standard_testfile
set executable $testfile
if { [prepare_for_testing "failed to prepare" $executable $srcfile] } {
return -1
}
proc restore_tests { } {
global gdb_prompt
if { ! [ runto driver ] } {
return 0
}
set limit 5
# For each caller function,
# call each of the callee functions,
# force a return from the callee, and
# make sure that the local variables still have the right values.
for {set c 1} {$c <= $limit} {incr c} {
# Set a breakpoint at the next caller function.
gdb_test "tbreak caller$c" "Temporary breakpoint.*\[0-9\]*\\."
# Continue to the next caller function.
gdb_test "continue" " caller$c prologue .*" "run to caller$c"
# Do each callee function.
for {set e 1} {$e <= $limit} {incr e} {
gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \
"caller$c calls callee$e; tbreak callee"
gdb_test "continue" " callee$e prologue .*/" \
"caller$c calls callee$e; continue to callee"
# Do a forced return from the callee.
set test "caller$c calls callee$e; return callee now"
gdb_test "return 0" \
" caller$c .*" \
"$test" \
"Make .* return now.*y or n. $" \
"y"
# Check that the values of the local variables are what
# they should be.
for {set var 1} {$var <= $c} {incr var} {
set expected [expr 0x7eeb + $var]
set test "caller$c calls callee$e; return restored l$var to $expected"
set pass_pattern " = $expected"
set unsupported_pattern " = <optimized out>"
gdb_test_multiple "print l$var" $test {
-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
pass $test
}
-re "\[\r\n\]*(?:$unsupported_pattern)\[\r\n\]+$gdb_prompt $" {
unsupported $test
}
}
}
}
}
gdb_continue_to_end "" continue 1
}
set prev_timeout $timeout
set timeout 30
restore_tests
set timeout $prev_timeout
# Test PR cli/23785
clean_restart $binfile
if { ![runto_main] } {
return -1
}
gdb_test "restore non-existent-file binary" \
"Failed to open non-existent-file: .*"
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