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

   1 # This testcase is part of GDB, the GNU debugger.
   2 #
   3 # Copyright 2016 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 # check for btrace support
  24 if { [skip_btrace_tests] } { return -1 }
  25
  26 # This test requires the compiler to generate a tail call.  To guarantee that
  27 # we always get one, we use an assembly source file.
  28 #
  29 # We use different assembly sources based on the target architecture.
  30 #
  31 # Luckily, they are similar enough that a single test script can handle
  32 # both.
  33 set opts {}
  34 if [info exists COMPILE] {
  35     # make check RUNTESTFLAGS="gdb.btrace/tailcall-only.exp COMPILE=1"
  36     standard_testfile tailcall-only.c
  37     lappend opts debug optimize=-O2
  38 } elseif {[istarget "x86_64-*-*"] && [is_lp64_target]} {
  39         standard_testfile x86_64-tailcall-only.S
  40 } elseif {[istarget "i?86-*-*"] || [istarget "x86_64-*-*"]} {
  41         standard_testfile i686-tailcall-only.S
  42 } else {
  43     verbose "Skipping ${testfile}."
  44     return
  45 }
  46
  47 if [prepare_for_testing tailcall-only.exp $testfile $srcfile $opts] {
  48     return -1
  49 }
  50 if ![runto_main] {
  51     return -1
  52 }
  53
  54 # we want to see the full trace for this test
  55 gdb_test_no_output "set record function-call-history-size 0"
  56
  57 # trace foo
  58 gdb_test "step" ".*" "prepare for recording"
  59 gdb_test_no_output "record btrace"
  60 gdb_test "stepi 4" ".*" "record branch trace"
  61
  62 # for debugging
  63 gdb_test "info record" ".*"
  64
  65 # show the branch trace with calls indented
  66 gdb_test "record function-call-history /c 1" [multi_line \
  67   "1\tfoo" \
  68   "2\t  foo_1" \
  69   "3\t    bar" \
  70   "4\t      bar_1"
  71   ] "function-call-history"
  72
  73 # We can step
  74 gdb_test "record goto begin" ".*foo.*"
  75 gdb_test "stepi" ".*foo_1.*" "step into foo_1"
  76 gdb_test "step" ".*bar.*" "step into bar"
  77 gdb_test "stepi" ".*bar_1.*" "step into bar_1"
  78
  79 # We can neither finish nor return.
  80 gdb_test "finish" "Cannot find the caller frame.*"
  81 gdb_test_multiple "return" "return" {
  82   -re "Make .* return now.*y or n. $" {
  83     send_gdb "y\n"
  84     exp_continue
  85   }
  86   -re "Cannot find the caller frame.*$gdb_prompt $" {
  87     pass "return"
  88   }
  89 }
  90
  91 # But we can reverse-finish
  92 gdb_test "reverse-finish" ".*bar.*"
  93 gdb_test "reverse-step" ".*foo_1.*"
  94
  95 # Info frame isn't useful but doesn't crash as it used to.
  96 gdb_test "up" ".*foo.*"
  97 gdb_test "info frame" ".*"