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

   1 # This testcase is part of GDB, the GNU debugger.
   2
   3 # Copyright 1997-2019 Free Software Foundation, Inc.
   4
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17 # step-test.exp -- Expect script to test stepping in gdb
  18
  19 standard_testfile .c
  20
  21 remote_exec build "rm -f ${binfile}"
  22 if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  23      untested "failed to compile"
  24      return -1
  25 }
  26
  27 clean_restart ${binfile}
  28
  29 if ![runto_main] then {
  30    fail "can't run to main"
  31    return 0
  32 }
  33
  34 # Set a breakpoint at line 45, if stepi then finish fails, we would
  35 # run to the end of the program, which would mess up the rest of the tests.
  36
  37 # Vanilla step/next
  38 #
  39 gdb_test "next" ".*${decimal}.*x = 1;.*" "next 1"
  40 gdb_test "step" ".*${decimal}.*y = 2;.*" "step 1"
  41
  42 # With count
  43 #
  44 gdb_test "next 2" ".*${decimal}.*w = w.*2;.*" "next 2"
  45 gdb_test "step 3" ".*${decimal}.*z = z.*5;.*" "step 3"
  46 gdb_test "next" ".*${decimal}.*callee.*OVER.*" "next 3"
  47
  48 # Step over call
  49 #
  50 gdb_test "next" ".*${decimal}.*callee.*INTO.*" "next over"
  51
  52 # Step into call
  53 #
  54 gdb_test "step" ".*${decimal}.*myglob.*"   "step into"
  55
  56 # Step out of call
  57 #
  58 # I wonder if this is really portable.  Are there any caller-saves
  59 # platforms, on which `finish' will return you to some kind of pop
  60 # instruction, which is attributed to the line containing the function
  61 # call?
  62
  63 # On PA64, we end up at a different instruction than PA32.
  64 # On IA-64, we also end up on callee instead of on the next line due
  65 # to the restoration of the global pointer (which is a caller-save).
  66 # Similarly on MIPS PIC targets.
  67 set test "step out"
  68 if { [istarget "ia64-*-*"] || [istarget "mips*-*-*"]} {
  69     gdb_test_multiple "finish" "$test" {
  70         -re ".*${decimal}.*a.*5.*= a.*3.*$gdb_prompt $" {
  71             pass "$test"
  72         }
  73         -re ".*${decimal}.*callee.*INTO.*$gdb_prompt $" {
  74             pass "$test"
  75         }
  76     }
  77 } else {
  78     gdb_test "finish" ".*${decimal}.*a.*5.*= a.*3.*" "step out"
  79 }
  80
  81 ### Testing nexti and stepi.
  82 ###
  83 ### test_i NAME COMMAND HERE THERE
  84 ###
  85 ### Send COMMAND to gdb over and over, while the output matches the
  86 ### regexp HERE, followed by the gdb prompt.  Pass if the output
  87 ### eventually matches the regexp THERE, followed by the gdb prompt;
  88 ### fail if we have to iterate more than a hundred times, we time out
  89 ### talking to gdb, or we get output which is neither HERE nor THERE.  :)
  90 ###
  91 ### Use NAME as the name of the test.
  92 ###
  93 ### The exact regexps used are "$HERE.*$gdb_prompt $"
  94 ###                        and "$THERE.*$gdb_prompt $"
  95 ###
  96 proc test_i {name command here there} {
  97     global gdb_prompt
  98
  99     set i 0
 100     gdb_test_multiple "$command" "$name" {
 101         -re "$here.*$gdb_prompt $" {
 102             # Have we gone for too many steps without seeing any progress?
 103             if {[incr i] >= 100} {
 104                 fail "$name (no progress after 100 steps)"
 105                 return
 106             }
 107             send_gdb "$command\n"
 108             exp_continue
 109         }
 110         -re "$there.*$gdb_prompt $" {
 111             # We've reached the next line.  Rah.
 112             pass "$name"
 113             return
 114         }
 115     }
 116 }
 117
 118 test_i "stepi to next line" "stepi" \
 119        ".*${decimal}.*a.*5.* = a.*3" \
 120        ".*${decimal}.*callee.*STEPI"
 121
 122 # Continue to step until we enter the function.  Also keep stepping
 123 # if this passes through a (useless) PLT entry.
 124 test_i "stepi into function" "stepi" \
 125        "(.*${decimal}.*callee.*STEPI|.* in callee@plt)" \
 126        ".*callee \\(\\) at .*step-test\\.c"
 127
 128 # Continue to step until we reach the function's body.  This makes it
 129 # more likely that we've actually completed the prologue, so "finish"
 130 # will work.
 131 test_i "stepi into function's first source line" "stepi" \
 132         ".*${decimal}.*int callee" \
 133         ".*${decimal}.*myglob.*; return 0;"
 134
 135 # Have to be careful here, if the finish does not work,
 136 # then we may run to the end of the program, which
 137 # will cause erroneous failures in the rest of the tests
 138 set test "stepi: finish call"
 139 gdb_test_multiple "finish" "$test" {
 140     -re ".*${decimal}.*callee.*NEXTI.*$gdb_prompt $" {
 141         pass "$test"
 142     }
 143     -re ".*(Program received|$inferior_exited_re).*$gdb_prompt $" {
 144         # Oops... We ran to the end of the program...  Better reset
 145         if {![runto_main]} then {
 146             fail "$test (Can't run to main)"
 147             return 0
 148         }
 149         if {![runto step-test.c:45]} {
 150             fail "$test (Can't run to line 45)"
 151             return 0
 152         }
 153         fail "$test"
 154     }
 155     -re ".*${decimal}.*callee.*STEPI.*$gdb_prompt $" {
 156         # On PA64, we end up at a different instruction than PA32.
 157         # On IA-64, we end up on callee instead of on the following line due
 158         # to the restoration of the global pointer.
 159         # Similarly on MIPS PIC targets.
 160         if { [istarget "ia64-*-*"] || [istarget "mips*-*-*"] } {
 161             test_i "$test" "stepi" \
 162                 ".*${decimal}.*callee.*STEPI"  ".*${decimal}.*callee.*NEXTI"
 163         } else {
 164             fail "$test"
 165         }
 166     }
 167 }
 168
 169 test_i "nexti over function" "nexti" \
 170        ".*${decimal}.*callee.*NEXTI" \
 171        ".*${decimal}.*y = w \\+ z;"
 172
 173 # On some platforms, if we try to step into a function call that
 174 # passes a large structure by value, then we actually end up stepping
 175 # into memcpy, bcopy, or some such --- GCC emits the call to pass the
 176 # argument.  Opinion is bitterly divided about whether this is the
 177 # right behavior for GDB or not, but we'll catch it here, so folks
 178 # won't forget about it.
 179 # Update 4/4/2002 - Regardless of which opinion you have, you would
 180 # probably have to agree that gdb is currently behaving as designed,
 181 # in the absence of additional code to not stop in functions used
 182 # internally by the compiler.  Since the testsuite should be checking
 183 # for conformance to the design, the correct behavior is to accept the
 184 # cases where gdb stops in memcpy/bcopy.
 185
 186 gdb_test \
 187   "break [gdb_get_line_number "step-test.exp: large struct by value"]" \
 188   ".*Breakpoint.* at .*" \
 189   "set breakpoint at call to large_struct_by_value"
 190 gdb_test "continue" \
 191          ".*Breakpoint ${decimal},.*large_struct_by_value.*" \
 192          "run to pass large struct"
 193 set test "large struct by value"
 194 gdb_test_multiple "step" "$test" {
 195     -re ".*step-test.exp: arrive here 1.*$gdb_prompt $" {
 196         pass "$test"
 197     }
 198     -re ".*(memcpy|bcopy).*$gdb_prompt $" {
 199         send_gdb "finish\n" ; gdb_expect -re "$gdb_prompt $"
 200         send_gdb "step\n"
 201         exp_continue
 202     }
 203 }
 204
 205 gdb_continue_to_end "step-test.exp"
 206
 207 return 0