gdb/testsuite/gdb.btrace/tailcall-only.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2 #
   3 # Copyright 2016-2022 Free Software Foundation, Inc.
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 #
  18 #
  19 # This is a variant of tailcall.exp where the entire trace contains only tail
  20 # calls.  This used to cause a crash in get_frame_type.
  21 #
  22
  23 if { [skip_btrace_tests] } {
  24     unsupported "target does not support record-btrace"
  25     return -1
  26 }
  27
  28 # This test requires the compiler to generate a tail call.  To guarantee that
  29 # we always get one, we use an assembly source file.
  30 #
  31 # We use different assembly sources based on the target architecture.
  32 #
  33 # Luckily, they are similar enough that a single test script can handle
  34 # both.
  35 set opts {}
  36 if [info exists COMPILE] {
  37     # make check RUNTESTFLAGS="gdb.btrace/tailcall-only.exp COMPILE=1"
  38     standard_testfile tailcall-only.c
  39     lappend opts debug optimize=-O2
  40 } elseif {[istarget "i?86-*-*"] || [istarget "x86_64-*-*"]} {
  41         if {[is_amd64_regs_target]} {
  42                 standard_testfile x86_64-tailcall-only.S
  43         } else {
  44                 standard_testfile i686-tailcall-only.S
  45         }
  46 } else {
  47     unsupported "target architecture not supported"
  48     return -1
  49 }
  50
  51 if [prepare_for_testing "failed to prepare" $testfile $srcfile $opts] {
  52     return -1
  53 }
  54
  55 if ![runto_main] {
  56     untested "failed to run to main"
  57     return -1
  58 }
  59
  60 # we want to see the full trace for this test
  61 gdb_test_no_output "set record function-call-history-size 0"
  62
  63 # trace foo
  64 gdb_test "step" ".*" "prepare for recording"
  65 gdb_test_no_output "record btrace"
  66 gdb_test "stepi 4" ".*" "record branch trace"
  67
  68 # for debugging
  69 gdb_test "info record" ".*"
  70
  71 # show the branch trace with calls indented
  72 gdb_test "record function-call-history /c 1" [multi_line \
  73   "1\tfoo" \
  74   "2\t  foo_1" \
  75   "3\t    bar" \
  76   "4\t      bar_1"
  77   ] "function-call-history"
  78
  79 # We can step
  80 gdb_test "record goto begin" ".*foo.*"
  81 gdb_test "stepi" ".*foo_1.*" "step into foo_1"
  82 gdb_test "step" ".*bar.*" "step into bar"
  83 gdb_test "stepi" ".*bar_1.*" "step into bar_1"
  84
  85 # We can neither finish nor return.
  86 gdb_test "finish" "Cannot find the caller frame.*"
  87 gdb_test_multiple "return" "return" {
  88   -re "Make .* return now.*y or n. $" {
  89     send_gdb "y\n"
  90     exp_continue
  91   }
  92   -re "Cannot find the caller frame.*$gdb_prompt $" {
  93     pass "return"
  94   }
  95 }
  96
  97 # But we can reverse-finish
  98 gdb_test "reverse-finish" ".*bar.*"
  99 gdb_test "reverse-step" ".*foo_1.*"
 100
 101 # Info frame isn't useful but doesn't crash as it used to.
 102 gdb_test "up" ".*foo.*"
 103 gdb_test "info frame" ".*"