1# Copyright 2018-2020 Free Software Foundation, Inc.
2
3# This program is free software; you can redistribute it and/or modify
4# it under the terms of the GNU General Public License as published by
5# the Free Software Foundation; either version 3 of the License, or
6# (at your option) any later version.
7#
8# This program is distributed in the hope that it will be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program.  If not, see <http://www.gnu.org/licenses/>.
15
16if { ![supports_reverse] } {
17    untested "target does not support record"
18    return -1
19}
20
21standard_testfile
22
23set cflags "-mindirect-branch=thunk -mfunction-return=thunk"
24if { [prepare_for_testing "failed to prepare" $testfile $srcfile \
25        [list debug "additional_flags=$cflags"]] } {
26    return -1
27}
28
29if { ![runto_main] } {
30    untested "failed to run to main"
31    return -1
32}
33
34# Do repeated stepping COMMANDs in order to reach TARGET from CURRENT
35#
36#  COMMAND is a stepping command
37#  CURRENT is a string matching the current location
38#  TARGET  is a string matching the target location
39#  TEST    is the test name
40#
41# The function issues repeated COMMANDs as long as the location matches
42# CURRENT up to a maximum of 100 steps.
43#
44# TEST passes if the resulting location matches TARGET and fails
45# otherwise.
46#
47proc step_until { command current target test } {
48    global gdb_prompt
49
50    set count 0
51    gdb_test_multiple "$command" "$test" {
52        -re "$current.*$gdb_prompt $" {
53            incr count
54            if { $count < 100 } {
55                send_gdb "$command\n"
56                exp_continue
57            } else {
58                fail "$test"
59            }
60        }
61        -re "$target.*$gdb_prompt $" {
62            pass "$test"
63        }
64    }
65}
66
67gdb_test_no_output "record"
68gdb_test "next" ".*" "record trace"
69
70# Normal stepping steps through all thunks.
71gdb_test "reverse-step" "apply\.3.*" "reverse-step into apply"
72gdb_test "reverse-step" "inc\.3.*" "reverse-step into inc"
73gdb_test "reverse-step" "inc\.2.*" "reverse-step inside inc"
74gdb_test "reverse-step" "apply\.2.*" \
75    "reverse-step through call thunk into apply, first time"
76gdb_test "reverse-step" "main\.2.*" "reverse-step into main"
77gdb_test "step" "apply\.2.*" "step into apply"
78gdb_test "step" "inc\.2.*" "step through call thunk into inc"
79gdb_test "reverse-step" "apply\.2.*" \
80    "reverse-step through call thunk into apply, second time"
81gdb_test "next" "apply\.3.*" "step through thunks and over inc"
82gdb_test "reverse-next" "apply\.2.*" \
83    "reverse-step through thunks and over inc"
84
85# We can use instruction stepping to step into thunks.
86step_until "stepi" "apply\.2" "indirect_thunk" "stepi into call thunk"
87step_until "stepi" "indirect_thunk" "inc" \
88    "stepi out of call thunk into inc"
89step_until "stepi" "inc" "return_thunk" "stepi into return thunk"
90step_until "stepi" "return_thunk" "apply" \
91    "stepi out of return thunk back into apply"
92
93step_until "reverse-stepi" "apply" "return_thunk" \
94    "reverse-stepi into return thunk"
95step_until "reverse-stepi" "return_thunk" "inc" \
96    "reverse-stepi out of return thunk into inc"
97step_until "reverse-stepi" "inc" "indirect_thunk" \
98    "reverse-stepi into call thunk"
99step_until "reverse-stepi" "indirect_thunk" "apply" \
100    "reverse-stepi out of call thunk into apply"
101