gdb/testsuite/gdb.btrace/tailcall.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2 #
   3 # Copyright 2013-2019 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 if { [skip_btrace_tests] } {
  21     unsupported "target does not support record-btrace"
  22     return -1
  23 }
  24
  25 # This test requires the compiler to generate a tail call.  To guarantee that
  26 # we always get one, we use an assembly source file.
  27 #
  28 # We use different assembly sources based on the target architecture.
  29 #
  30 # Luckily, they are similar enough that a single test script can handle
  31 # both.
  32 set opts {}
  33 if [info exists COMPILE] {
  34     # make check RUNTESTFLAGS="gdb.btrace/tailcall.exp COMPILE=1"
  35     standard_testfile tailcall.c
  36     lappend opts debug optimize=-O2
  37 } elseif {[istarget "i?86-*-*"] || [istarget "x86_64-*-*"]} {
  38         if {[is_amd64_regs_target]} {
  39                 standard_testfile x86_64-tailcall.S
  40         } else {
  41                 standard_testfile i686-tailcall.S
  42         }
  43 } else {
  44     unsupported "target architecture not supported"
  45     return -1
  46 }
  47
  48 if [prepare_for_testing "failed to prepare" $testfile $srcfile $opts] {
  49     return -1
  50 }
  51 if ![runto_main] {
  52     untested "failed to run to main"
  53     return -1
  54 }
  55
  56 # we want to see the full trace for this test
  57 gdb_test_no_output "set record function-call-history-size 0"
  58
  59 # trace the call to foo
  60 gdb_test_no_output "record btrace"
  61 gdb_test "next 2"
  62
  63 # show the flat branch trace
  64 gdb_test "record function-call-history 1" [multi_line \
  65   "1\tmain" \
  66   "2\tfoo" \
  67   "3\tbar" \
  68   "4\tmain" \
  69   ] "flat"
  70
  71 # show the branch trace with calls indented
  72 gdb_test "record function-call-history /c 1" [multi_line \
  73   "1\tmain" \
  74   "2\t  foo" \
  75   "3\t    bar" \
  76   "4\tmain" \
  77   ] "indented"
  78
  79 # go into bar
  80 gdb_test "record goto 4" ".*bar \\(\\) at .*tailcall.c:24\r\n.*"
  81
  82 # check the backtrace
  83 gdb_test "backtrace" [multi_line \
  84   "#0.*bar \\(\\) at tailcall.c:24" \
  85   "#1.*foo \\(\\) at tailcall.c:29" \
  86   "#2.*main \\(\\) at tailcall.c:37" \
  87   "Backtrace stopped: not enough registers or memory available to unwind further" \
  88   ]
  89
  90 # walk the backtrace
  91 gdb_test "up" "#1\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" "up to foo"
  92 gdb_test "up" "#2\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*" "up to main"
  93 gdb_test "down" "#1\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" "down to foo"
  94
  95 # test stepping into and out of tailcalls.
  96 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*"
  97 gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at tailcall.c:24\r\n.*"
  98 gdb_test "reverse-finish" "\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*"
  99 gdb_test "reverse-step" "\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*"
 100 gdb_test "next" "\[^\r\n\]*38.*"
 101 gdb_test "reverse-next" "\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*"
 102 gdb_test "step" "\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*"
 103 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*"
 104 gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at tailcall.c:24\r\n.*"
 105 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*"