gdb/testsuite/gdb.base/recurse.exp

   1 # Copyright 1992, 1994, 1995, 1996, 1997, 1999, 2000, 2007
   2 # Free Software Foundation, Inc.
   3
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 # Please email any bugs, comments, and/or additions to this file to:
  18 # bug-gdb@prep.ai.mit.edu
  19
  20 # This file was written by Jeff Law. (law@cs.utah.edu)
  21
  22 if $tracelevel then {
  23     strace $tracelevel
  24 }
  25
  26 set prms_id 0
  27 set bug_id 0
  28
  29 set testfile "recurse"
  30 set srcfile ${testfile}.c
  31 set binfile ${objdir}/${subdir}/${testfile}
  32 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  33      untested recurse.exp
  34      return -1
  35 }
  36
  37 # Start with a fresh gdb.
  38
  39 gdb_exit
  40 gdb_start
  41 gdb_reinitialize_dir $srcdir/$subdir
  42 gdb_load ${binfile}
  43
  44 proc recurse_tests {} {
  45
  46     # Disable hardware watchpoints if necessary.
  47     if [target_info exists gdb,no_hardware_watchpoints] {
  48         gdb_test "set can-use-hw-watchpoints 0" "" ""
  49     }
  50
  51     if [runto recurse] then {
  52         # First we need to step over the assignment of b, so it has a known
  53         # value.
  54         gdb_test "next" "if \\(a == 1\\)" "next over b = 0 in first instance"
  55         gdb_test "watch b" ".*\[Ww\]atchpoint \[0-9]*: b" \
  56             "set first instance watchpoint"
  57
  58         # Continue until initial set of b.
  59         if [gdb_test "continue" \
  60             "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 0.*New value = 10.*" \
  61             "continue to first instance watchpoint, first time"] then {
  62             gdb_suppress_tests;
  63         }
  64
  65         # Continue inward for a few iterations
  66         gdb_test "continue" "Breakpoint.* recurse \\(a=9\\).*" \
  67             "continue to recurse (a = 9)"
  68         gdb_test "continue" "Breakpoint.* recurse \\(a=8\\).*" \
  69             "continue to recurse (a = 8)"
  70         gdb_test "continue" "Breakpoint.* recurse \\(a=7\\).*" \
  71             "continue to recurse (a = 7)"
  72         gdb_test "continue" "Breakpoint.* recurse \\(a=6\\).*" \
  73             "continue to recurse (a = 6)"
  74         gdb_test "continue" "Breakpoint.* recurse \\(a=5\\).*" \
  75             "continue to recurse (a = 5)"
  76
  77         # Put a watchpoint on another instance of b
  78         # First we need to step over the assignment of b, so it has a known
  79         # value.
  80         gdb_test "next" "if \\(a == 1\\)" "next over b = 0 in second instance"
  81         gdb_test "watch b" ".*\[Ww\]atchpoint \[0-9]*: b" \
  82             "set second instance watchpoint"
  83
  84         # Continue until initial set of b (second instance).
  85         if [gdb_test "continue" \
  86             "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 0.*New value = 5.*"\
  87             "continue to second instance watchpoint, first time"] then {
  88         gdb_suppress_tests;
  89         }
  90
  91         # Continue inward for a few iterations
  92         gdb_test "continue" "Breakpoint.* recurse \\(a=4\\).*" \
  93             "continue to recurse (a = 4)"
  94         gdb_test "continue" "Breakpoint.* recurse \\(a=3\\).*" \
  95             "continue to recurse (a = 3)"
  96         gdb_test "continue" "Breakpoint.* recurse \\(a=2\\).*" \
  97             "continue to recurse (a = 2)"
  98         gdb_test "continue" "Breakpoint.* recurse \\(a=1\\).*" \
  99             "continue to recurse (a = 1)"
 100
 101         # Continue until second set of b (second instance).
 102         if [gdb_test "continue" \
 103             "Continuing.*\[Ww\]atchpoint.*: b.*Old value = 5.*New value = 120.*return.*" \
 104             "continue to second instance watchpoint, second time"] then {
 105             gdb_suppress_tests;
 106         }
 107
 108         # Continue again.  We should have a watchpoint go out of scope now
 109         if [gdb_test "continue" \
 110             "Continuing.*\[Ww\]atchpoint.*deleted.*recurse \\(a=6\\) .*" \
 111             "second instance watchpoint deleted when leaving scope"] then {
 112             gdb_suppress_tests;
 113         }
 114
 115         # Continue until second set of b (first instance).
 116         # 24320 is allowed as the final value for b as that's the value
 117         # b would have on systems with 16bit integers.
 118         #
 119         # We could fix the test program to deal with this too.
 120         if [gdb_test "continue" \
 121             "Continuing.*\[Ww\]atchpoint.*b.*Old value = 10.*New value = \(3628800|24320\).*return.*" \
 122             "continue to first instance watchpoint, second time"] then {
 123             gdb_suppress_tests
 124         }
 125
 126         # Continue again.  We should have a watchpoint go out of scope now.
 127         #
 128         # The former version expected the test to return to main().
 129         # Now it expects the test to return to main or to stop in the
 130         # function's epilogue.
 131         #
 132         # The problem is that gdb needs to (but doesn't) understand
 133         # function epilogues in the same way as for prologues.
 134         #
 135         # If there is no hardware watchpoint (such as a x86 debug register),
 136         # then watchpoints are done "the hard way" by single-stepping the
 137         # target until the value of the watched variable changes.  If you
 138         # are single-stepping, you will eventually step into an epilogue.
 139         # When you do that, the "top" stack frame may become partially
 140         # deconstructed (as when you pop the frame pointer, for instance),
 141         # and from that point on, GDB can no longer make sense of the stack.
 142         #
 143         # A test which stops in the epilogue is trying to determine when GDB
 144         # leaves the stack frame in which the watchpoint was created.  It does
 145         # this basically by watching for the frame pointer to change.  When
 146         # the frame pointer changes, the test expects to be back in main, but
 147         # instead it is still in the epilogue of the callee.
 148         if [gdb_test "continue" \
 149             "Continuing.*\[Ww\]atchpoint.*deleted.*\(main \\(\\) \|21.*\}\).*" \
 150             "first instance watchpoint deleted when leaving scope"] then {
 151             gdb_suppress_tests;
 152         }
 153     }
 154     gdb_stop_suppressing_tests;
 155 }
 156
 157 # Preserve the old timeout, and set a new one that should be
 158 # sufficient to avoid timing out during this test.
 159 set oldtimeout $timeout
 160 set timeout [expr "$timeout + 60"]
 161 verbose "Timeout is now $timeout seconds" 2
 162
 163 recurse_tests
 164
 165 # Restore the preserved old timeout value.
 166 set timeout $oldtimeout
 167 verbose "Timeout is now $timeout seconds" 2
 168