gdb/testsuite/gdb.base/step-through-epilogue.exp

#   Copyright 2022-2023 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 test is used to confirm that GDB is able to step, stopping at an
# epilogue line, then step out of the function.

standard_testfile

if { ![have_epilogue_line_info] } {
    untested "This test doesn't work with this compiler"
    return
}

if { [prepare_for_testing "failed to prepare" $testfile \
			  {step-through-epilogue.c}] } {
    untested "failed to prepare"
    return
}

if { ![runto_main] } {
    untested "couldn't run to main"
    return
}

proc step_till_epilogue_multiply {} {
    gdb_test "step" ".*return a . b;.*" "step into multiply"
    gdb_test "step" \
	     "$::decimal\\s+\\\}\[^\r\n\]+Epilogue line of multiply.*" \
	     "stop at the epilogue of multiply"
}

proc step_till_epilogue_square {} {
    gdb_test "step" ".*return multiply.*" "step into square"
    step_till_epilogue_multiply
    gdb_test "step" \
	     "$::decimal\\s+\\\}\[^\r\n\]+Epilogue line of square.*" \
	     "stop at epilogue of square"
}

with_test_prefix "multiply" {
    step_till_epilogue_multiply
    gdb_test "step" "x = square \\(2\\);" "leave function"
}

with_test_prefix "square" {
    step_till_epilogue_square
    gdb_test "step" ".*x = multiply \\(square \\(1\\), square \\(2\\)\\);.*"\
	"leave function"
}

# Some gcc versions can mess this test by requiring extra steps in a
# few locations.  We dynamically test if we're in one such versions in the
# the first argument, and use that to see if extra steps are needed to
# finish the second argument
set midway_return false

with_test_prefix "square, first argument" {
    step_till_epilogue_square
    gdb_test_multiple "step" "step back to main" {
	-re -wrap "multiply \\(square \\(1\\), square \\(2\\)\\);" {
	    set midway_return true
	    gdb_send "step\n"
	    exp_continue
	}

	-re -wrap "return multiply.*" {
	    pass $gdb_test_name
	}
    }
}
with_test_prefix "square, second argument" {
    step_till_epilogue_multiply
    gdb_test "step" \
	     "$::decimal\\s+\\\}\[^\r\n\]+Epilogue line of square.*" \
	     "stop at epilogue of square"
    if {$midway_return} {
	gdb_test "step"\
	    ".*x = multiply \\(square \\(1\\), square \\(2\\)\\);.*"\
	    "step back to main"
    }
}

with_test_prefix "multiply with function args" {
    step_till_epilogue_multiply
    gdb_test "step" ".*return 0;.*" "leave last function"
}