gnu/dist/gdb6/gdb/testsuite/gdb.base/savedregs.exp

   1 # Copyright 2004 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16
  17 # This test is to check that a frame's "info frame", especially the
  18 # saved registers list, doesn't change while that frame isn't current.
  19
  20 # It uses the program savedregs.c to construct a somewhat warped
  21 # backtrace (contains both signal and dummy frames) and then, at each
  22 # step checks that non-inner frames have consistent "info frame"
  23 # output.  Note that a frame's "info frame" can only be captured after
  24 # it is non-current (made a call, interrupted, ...), this is because
  25 # instructions executed to perform the call may affect "info frame"
  26 # output.
  27
  28 if [target_info exists gdb,nosignals] {
  29     verbose "Skipping savedregs.exp because of nosignals."
  30     continue
  31 }
  32
  33 if $tracelevel then {
  34     strace $tracelevel
  35 }
  36
  37 set prms_id 0
  38 set bug_id 0
  39
  40 set testfile savedregs
  41 set srcfile ${testfile}.c
  42 set binfile ${objdir}/${subdir}/${testfile}
  43 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  44     untested "Couldn't compile ${module}.c"
  45     return -1
  46 }
  47
  48 # get things started
  49 gdb_exit
  50 gdb_start
  51 gdb_reinitialize_dir $srcdir/$subdir
  52 gdb_load ${binfile}
  53
  54 # Advance to main
  55 if { ![runto_main] } {
  56     gdb_suppress_tests;
  57 }
  58
  59 proc process_saved_regs { current inner outer } {
  60     global gdb_prompt
  61     global expect_out
  62     global saved_regs
  63
  64     # Skip the CURRENT frame.
  65
  66     set level 1
  67
  68     # Run over the list of INNER frames capturing the "info frame"
  69     # output for each.  Both dummy and sigtramp frames need to be
  70     # handled specially: they do not yet have correct function names;
  71     # and for dummy frames won't have saved registers.  If there's a
  72     # problem, fail but capture the output anyway, hopefully later
  73     # "info frame" requests for that same frame will at least fail in
  74     # a consistent manner (stops propogated fails).
  75
  76     foreach func $inner {
  77         set saved_regs($func) "error"
  78         set test "Get $func info frame"
  79         # Both dummy and sigtramp frames have problems.
  80         switch $func {
  81             dummy {
  82                 # Dummy frame's do not have saved registers, and do
  83                 # not print <dummy>.
  84                 set pat "Stack frame at .*"
  85             }
  86             sigtramp {
  87                 # Sigtramp frames don't yet print <signal trampoline>.
  88                 set pat "Stack frame at .* Saved registers:.*"
  89             }
  90             default {
  91                 set pat "Stack frame at .* in $func .* Saved registers:.*"
  92             }
  93         }
  94         # If the "info frame" barf, capture the output anyway so that
  95         # it does not cascade further failures.
  96         gdb_test_multiple "info frame $level" "$test" {
  97             -re "($pat)$gdb_prompt " {
  98                 set saved_regs($func) "$expect_out(1,string)"
  99                 pass "$test"
 100             }
 101             -re "(Stack frame at .*)$gdb_prompt " {
 102                 set saved_regs($func) "$expect_out(1,string)"
 103                 fail "$test"
 104             }
 105             -re "(Cannot access .*)$gdb_prompt " {
 106                 set saved_regs($func) "$expect_out(1,string)"
 107                 fail "$test"
 108             }
 109         }
 110         incr level
 111     }
 112
 113     # Now iterate through the list of OUTER frames checking that the
 114     # "info frame" output from each still matches what was captured
 115     # during an early query.  To avoid cascading failures, checking is
 116     # abandoned after the first failure.  The assumption is that,
 117     # since frames outer to the botched frame rely on the botched
 118     # frame's info, those more outer frames are also botched.  Besides
 119     # we've got the failure we're after.
 120
 121     set ok 1
 122     foreach func $outer {
 123         set test [concat "Check $func info frame; stack contains" \
 124                       $current $inner $outer]
 125         if $ok {
 126             set ok 0
 127             set pat [string_to_regexp "$saved_regs($func)"]
 128             gdb_test_multiple "info frame $level" "$test" {
 129                 -re "$pat$gdb_prompt " {
 130                     pass "$test"
 131                     set ok 1
 132                 }
 133             }
 134         } {
 135             pass "$test (skipped)"
 136         }
 137         incr level
 138     }
 139 }
 140
 141
 142 # Continue to the signal thrower, capture main's saved-reg info.
 143 gdb_test "advance thrower" "thrower .* at .*"
 144 process_saved_regs thrower { main } { }
 145
 146 # Continue to the signal catcher, check main's saved-reg info, capture
 147 # catcher's saved-reg info.
 148 gdb_test "handle SIGSEGV pass print nostop"
 149 gdb_test "advance catcher" "catcher .* at .*"
 150 process_saved_regs catcher { sigtramp thrower } { main }
 151
 152 # Breakpoint at and call the caller function, saved-regs of main and
 153 # catcher, capture caller's registers.
 154 gdb_test "break caller"
 155 gdb_test "call caller (1,2,3,4,5,6,7,8)"
 156 process_saved_regs caller { dummy catcher } { sigtramp thrower main }
 157
 158 # Run to callee, again check everything.
 159 gdb_test "advance callee" "callee .* at .*"
 160 process_saved_regs callee { caller } { dummy catcher sigtramp thrower main }