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# This testcase is part of GDB, the GNU debugger.
# Copyright 2016-2021 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
# 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 <>.
# This is a variant of tailcall.exp where the entire trace contains only tail
# calls. This used to cause a crash in get_frame_type.
if { [skip_btrace_tests] } {
unsupported "target does not support record-btrace"
return -1
# This test requires the compiler to generate a tail call. To guarantee that
# we always get one, we use an assembly source file.
# We use different assembly sources based on the target architecture.
# Luckily, they are similar enough that a single test script can handle
# both.
set opts {}
if [info exists COMPILE] {
# make check RUNTESTFLAGS="gdb.btrace/tailcall-only.exp COMPILE=1"
standard_testfile tailcall-only.c
lappend opts debug optimize=-O2
} elseif {[istarget "i?86-*-*"] || [istarget "x86_64-*-*"]} {
if {[is_amd64_regs_target]} {
standard_testfile x86_64-tailcall-only.S
} else {
standard_testfile i686-tailcall-only.S
} else {
unsupported "target architecture not supported"
return -1
if [prepare_for_testing "failed to prepare" $testfile $srcfile $opts] {
return -1
if ![runto_main] {
return -1
# we want to see the full trace for this test
gdb_test_no_output "set record function-call-history-size 0"
# trace foo
gdb_test "step" ".*" "prepare for recording"
gdb_test_no_output "record btrace"
gdb_test "stepi 4" ".*" "record branch trace"
# for debugging
gdb_test "info record" ".*"
# show the branch trace with calls indented
gdb_test "record function-call-history /c 1" [multi_line \
"1\tfoo" \
"2\t foo_1" \
"3\t bar" \
"4\t bar_1"
] "function-call-history"
# We can step
gdb_test "record goto begin" ".*foo.*"
gdb_test "stepi" ".*foo_1.*" "step into foo_1"
gdb_test "step" ".*bar.*" "step into bar"
gdb_test "stepi" ".*bar_1.*" "step into bar_1"
# We can neither finish nor return.
gdb_test "finish" "Cannot find the caller frame.*"
gdb_test_multiple "return" "return" {
-re "Make .* return now.*y or n. $" {
send_gdb "y\n"
-re "Cannot find the caller frame.*$gdb_prompt $" {
pass "return"
# But we can reverse-finish
gdb_test "reverse-finish" ".*bar.*"
gdb_test "reverse-step" ".*foo_1.*"
# Info frame isn't useful but doesn't crash as it used to.
gdb_test "up" ".*foo.*"
gdb_test "info frame" ".*"