gdb/testsuite/gdb.base/step-test.exp

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 1997, 1998, 1999, 2000, 2002, 2001, 2003, 2004, 2007
   4 # Free Software Foundation, Inc.
   5
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18 # step-test.exp -- Expect script to test stepping in gdb
  19
  20 if $tracelevel then {
  21     strace $tracelevel
  22 }
  23
  24 set testfile step-test
  25 set srcfile ${testfile}.c
  26 set binfile ${objdir}/${subdir}/${testfile}
  27
  28 remote_exec build "rm -f ${binfile}"
  29 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  30      untested step-test.exp
  31      return -1
  32 }
  33
  34 gdb_exit
  35 gdb_start
  36 gdb_reinitialize_dir $srcdir/$subdir
  37 gdb_load ${binfile}
  38
  39 if ![runto_main] then {
  40    fail "Can't run to main"
  41    return 0
  42 }
  43
  44 # Set a breakpoint at line 45, if stepi then finish fails, we would
  45 # run to the end of the program, which would mess up the rest of the tests.
  46
  47 # Vanilla step/next
  48 #
  49 gdb_test "next" ".*${decimal}.*x = 1;.*" "next 1"
  50 gdb_test "step" ".*${decimal}.*y = 2;.*" "step 1"
  51
  52 # With count
  53 #
  54 gdb_test "next 2" ".*${decimal}.*w = w.*2;.*" "next 2"
  55 gdb_test "step 3" ".*${decimal}.*z = z.*5;.*" "step 3"
  56 gdb_test "next" ".*${decimal}.*callee.*OVER.*" "next 3"
  57
  58 # Step over call
  59 #
  60 gdb_test "next" ".*${decimal}.*callee.*INTO.*" "next over"
  61
  62 # Step into call
  63 #
  64 gdb_test "step" ".*${decimal}.*myglob.*"   "step into"
  65
  66 # Step out of call
  67 #
  68 # I wonder if this is really portable.  Are there any caller-saves
  69 # platforms, on which `finish' will return you to some kind of pop
  70 # instruction, which is attributed to the line containing the function
  71 # call?
  72
  73 # On PA64, we end up at a different instruction than PA32.
  74 # On IA-64, we also end up on callee instead of on the next line due
  75 # to the restoration of the global pointer (which is a caller-save).
  76 # Similarly on MIPS PIC targets.
  77 set test "step out"
  78 if { [istarget "hppa2.0w-hp-hpux*"] || [istarget "ia64-*-*"] || [istarget "mips*-*-*"]} {
  79     gdb_test_multiple "finish" "$test" {
  80         -re ".*${decimal}.*a.*5.*= a.*3.*$gdb_prompt $" {
  81             pass "$test"
  82         }
  83         -re ".*${decimal}.*callee.*INTO.*$gdb_prompt $" {
  84             pass "$test"
  85         }
  86     }
  87 } else {
  88     gdb_test "finish" ".*${decimal}.*a.*5.*= a.*3.*" "step out"
  89 }
  90
  91 ### Testing nexti and stepi.
  92 ###
  93 ### test_i NAME COMMAND HERE THERE
  94 ###
  95 ### Send COMMAND to gdb over and over, while the output matches the
  96 ### regexp HERE, followed by the gdb prompt.  Pass if the output
  97 ### eventually matches the regexp THERE, followed by the gdb prompt;
  98 ### fail if we have to iterate more than a hundred times, we time out
  99 ### talking to gdb, or we get output which is neither HERE nor THERE.  :)
 100 ###
 101 ### Use NAME as the name of the test.
 102 ###
 103 ### The exact regexps used are "$HERE.*$gdb_prompt $"
 104 ###                        and "$THERE.*$gdb_prompt $"
 105 ###
 106 proc test_i {name command here there} {
 107     global gdb_prompt
 108
 109     set i 0
 110     gdb_test_multiple "$command" "$name" {
 111         -re "$here.*$gdb_prompt $" {
 112             # Have we gone for too many steps without seeing any progress?
 113             if {[incr i] >= 100} {
 114                 fail "$name (no progress after 100 steps)"
 115                 return
 116             }
 117             send_gdb "$command\n"
 118             exp_continue
 119         }
 120         -re "$there.*$gdb_prompt $" {
 121             # We've reached the next line.  Rah.
 122             pass "$name"
 123             return
 124         }
 125     }
 126 }
 127
 128 test_i "stepi to next line" "stepi" \
 129        ".*${decimal}.*a.*5.* = a.*3" \
 130        ".*${decimal}.*callee.*STEPI"
 131 test_i "stepi into function" "stepi" \
 132        ".*${decimal}.*callee.*STEPI" \
 133        ".*callee \\(\\) at .*step-test\\.c"
 134
 135 # Continue to step until we reach the function's body.  This makes it
 136 # more likely that we've actually completed the prologue, so "finish"
 137 # will work.
 138 test_i "stepi into function's first source line" "stepi" \
 139         ".*${decimal}.*int callee" \
 140         ".*${decimal}.*myglob.*; return 0;"
 141
 142 # Have to be careful here, if the finish does not work,
 143 # then we may run to the end of the program, which
 144 # will cause erroneous failures in the rest of the tests
 145 set test "stepi: finish call"
 146 gdb_test_multiple "finish" "$test" {
 147     -re ".*${decimal}.*callee.*NEXTI.*$gdb_prompt $" {
 148         pass "$test"
 149     }
 150     -re ".*(Program received|Program exited).*$gdb_prompt $" {
 151         # Oops... We ran to the end of the program...  Better reset
 152         if {![runto_main]} then {
 153             fail "$test (Can't run to main)"
 154             return 0
 155         }
 156         if {![runto step-test.c:45]} {
 157             fail "$test (Can't run to line 45)"
 158             return 0
 159         }
 160         fail "$test"
 161     }
 162     -re ".*${decimal}.*callee.*STEPI.*$gdb_prompt $" {
 163         # On PA64, we end up at a different instruction than PA32.
 164         # On IA-64, we end up on callee instead of on the following line due
 165         # to the restoration of the global pointer.
 166         # Similarly on MIPS PIC targets.
 167         if { [istarget "hppa2.0w-hp-hpux*"] || [istarget "ia64-*-*"] || [istarget "mips*-*-*"] } {
 168             test_i "$test" "stepi" \
 169                 ".*${decimal}.*callee.*STEPI"  ".*${decimal}.*callee.*NEXTI"
 170         } else {
 171             fail "$test"
 172         }
 173     }
 174 }
 175
 176 test_i "nexti over function" "nexti" \
 177        ".*${decimal}.*callee.*NEXTI" \
 178        ".*${decimal}.*y = w \\+ z;"
 179
 180 # On some platforms, if we try to step into a function call that
 181 # passes a large structure by value, then we actually end up stepping
 182 # into memcpy, bcopy, or some such --- GCC emits the call to pass the
 183 # argument.  Opinion is bitterly divided about whether this is the
 184 # right behavior for GDB or not, but we'll catch it here, so folks
 185 # won't forget about it.
 186 # Update 4/4/2002 - Regardless of which opinion you have, you would
 187 # probably have to agree that gdb is currently behaving as designed,
 188 # in the absence of additional code to not stop in functions used
 189 # internally by the compiler.  Since the testsuite should be checking
 190 # for conformance to the design, the correct behavior is to accept the
 191 # cases where gdb stops in memcpy/bcopy.
 192
 193 gdb_test \
 194   "break [gdb_get_line_number "step-test.exp: large struct by value"]" \
 195   ".*Breakpoint.* at .*" \
 196   "set breakpoint at call to large_struct_by_value"
 197 gdb_test "continue" \
 198          ".*Breakpoint ${decimal},.*large_struct_by_value.*" \
 199          "run to pass large struct"
 200 set test "large struct by value"
 201 gdb_test_multiple "step" "$test" {
 202     -re ".*step-test.exp: arrive here 1.*$gdb_prompt $" {
 203         pass "$test"
 204     }
 205     -re ".*(memcpy|bcopy).*$gdb_prompt $" {
 206         send_gdb "finish\n" ; gdb_expect -re "$gdb_prompt $"
 207         send_gdb "step\n"
 208         exp_continue
 209     }
 210 }
 211
 212 gdb_continue_to_end "step-test.exp"
 213
 214 return 0