gdb/testsuite/gdb.btrace/tailcall.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2 #
   3 # Copyright 2013-2022 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     return -1
  53 }
  54
  55 # we want to see the full trace for this test
  56 gdb_test_no_output "set record function-call-history-size 0"
  57
  58 # trace the call to foo
  59 gdb_test_no_output "record btrace"
  60 gdb_test "next 2"
  61
  62 # show the flat branch trace
  63 gdb_test "record function-call-history 1" [multi_line \
  64   "1\tmain" \
  65   "2\tfoo" \
  66   "3\tbar" \
  67   "4\tmain" \
  68   ] "flat"
  69
  70 # show the branch trace with calls indented
  71 gdb_test "record function-call-history /c 1" [multi_line \
  72   "1\tmain" \
  73   "2\t  foo" \
  74   "3\t    bar" \
  75   "4\tmain" \
  76   ] "indented"
  77
  78 # go into bar
  79 gdb_test "record goto 4" ".*bar \\(\\) at .*tailcall.c:24\r\n.*"
  80
  81 # check the backtrace
  82 gdb_test "backtrace" [multi_line \
  83   "#0.*bar \\(\\) at tailcall.c:24" \
  84   "#1.*foo \\(\\) at tailcall.c:29" \
  85   "#2.*main \\(\\) at tailcall.c:37" \
  86   "Backtrace stopped: not enough registers or memory available to unwind further" \
  87   ]
  88
  89 # walk the backtrace
  90 gdb_test "up" "#1\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" "up to foo"
  91 gdb_test "up" "#2\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*" "up to main"
  92 gdb_test "down" "#1\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" "down to foo"
  93
  94 # test stepping into and out of tailcalls.
  95 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*" \
  96     "finish.1"
  97 gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at tailcall.c:24\r\n.*" \
  98     "reverse-step.1"
  99 gdb_test "reverse-finish" "\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" \
 100     "reverse-finish.1"
 101 gdb_test "reverse-step" "\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*" \
 102     "reverse-step.2"
 103 gdb_test "next" "\[^\r\n\]*38.*" \
 104     "next.1"
 105 gdb_test "reverse-next" "\[^\r\n\]*main \\(\\) at tailcall.c:37\r\n.*" \
 106     "reverse-next.1"
 107 gdb_test "step" "\[^\r\n\]*foo \\(\\) at tailcall.c:29\r\n.*" \
 108     "step.1"
 109 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*" \
 110     "finish.2"
 111 gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at tailcall.c:24\r\n.*" \
 112     "reverse-step.3"
 113 gdb_test "finish" "\[^\r\n\]*main \\(\\) at tailcall.c:38\r\n.*" \
 114     "finish.3"