gdb/testsuite/gdb.btrace/tailcall.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2 #
   3 # Copyright 2013-2017 Free Software Foundation, Inc.
   4 #
   5 # Contributed by Intel Corp. <markus.t.metzger@intel.com>
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 # check for btrace support
  21 if { [skip_btrace_tests] } { return -1 }
  22
  23 # This test requires the compiler to generate a tail call.  To guarantee that
  24 # we always get one, we use an assembly source file.
  25 #
  26 # We use different assembly sources based on the target architecture.
  27 #
  28 # Luckily, they are similar enough that a single test script can handle
  29 # both.
  30 set opts {}
  31 if [info exists COMPILE] {
  32     # make check RUNTESTFLAGS="gdb.btrace/tailcall.exp COMPILE=1"
  33     standard_testfile tailcall.c
  34     lappend opts debug optimize=-O2
  35 } elseif {[istarget "i?86-*-*"] || [istarget "x86_64-*-*"]} {
  36         if {[is_amd64_regs_target]} {
  37                 standard_testfile x86_64-tailcall.S
  38         } else {
  39                 standard_testfile i686-tailcall.S
  40         }
  41 } else {
  42     verbose "Skipping ${testfile}."
  43     return -1
  44 }
  45
  46 if [prepare_for_testing "failed to prepare" $testfile $srcfile $opts] {
  47     return -1
  48 }
  49 if ![runto_main] {
  50     return -1
  51 }
  52
  53 # we want to see the full trace for this test
  54 gdb_test_no_output "set record function-call-history-size 0"
  55
  56 # trace the call to foo
  57 gdb_test_no_output "record btrace"
  58 gdb_test "next 2"
  59
  60 # show the flat branch trace
  61 gdb_test "record function-call-history 1" [multi_line \
  62   "1\tmain" \
  63   "2\tfoo" \
  64   "3\tbar" \
  65   "4\tmain" \
  66   ] "flat"
  67
  68 # show the branch trace with calls indented
  69 gdb_test "record function-call-history /c 1" [multi_line \
  70   "1\tmain" \
  71   "2\t  foo" \
  72   "3\t    bar" \
  73   "4\tmain" \
  74   ] "indented"
  75
  76 # go into bar
  77 gdb_test "record goto 4" ".*bar \\(\\) at .*tailcall.c:24\r\n.*"
  78
  79 # check the backtrace
  80 gdb_test "backtrace" [multi_line \
  81   "#0.*bar \\(\\) at tailcall.c:24" \
  82   "#1.*foo \\(\\) at tailcall.c:29" \
  83   "#2.*main \\(\\) at tailcall.c:37" \
  84   "Backtrace stopped: not enough registers or memory available to unwind further" \
  85   ]
  86
  87 # walk the backtrace
  88 gdb_test "up" "#1\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" "up to foo"
  89 gdb_test "up" "#2\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*" "up to main"
  90 gdb_test "down" "#1\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" "down to foo"
  91
  92 # test stepping into and out of tailcalls.
  93 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*"
  94 gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at tailcall.c:24\r\n.*"
  95 gdb_test "reverse-finish" "\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*"
  96 gdb_test "reverse-step" "\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*"
  97 gdb_test "next" "\[^\r\n\]*38.*"
  98 gdb_test "reverse-next" "\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*"
  99 gdb_test "step" "\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*"
 100 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*"
 101 gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at tailcall.c:24\r\n.*"
 102 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*"