gdb/testsuite/gdb.base/step-over-no-symbols.exp

   1 # Copyright (C) 2015-2023 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 3 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, see <http://www.gnu.org/licenses/>.
  15
  16 # Test that GDB can step past a breakpoint even if GDB doesn't have
  17 # symbols for the main binary.  PR gdb/13858.
  18
  19 standard_testfile start.c
  20
  21 if { [build_executable "failed to build" ${testfile} $srcfile] } {
  22     return -1
  23 }
  24
  25 # Get the current PC.  MSG is used as test message.
  26
  27 proc get_pc { msg } {
  28     global hex gdb_prompt
  29
  30     set addr ""
  31     gdb_test_multiple "p /x \$pc" "$msg" {
  32         -re " = ($hex).*$gdb_prompt $" {
  33             set addr $expect_out(1,string)
  34             pass "$msg"
  35         }
  36     }
  37
  38     return $addr
  39 }
  40
  41 # Test stepping past a breakpoint with no symbols.  DISPLACED is one
  42 # of the "set displaced-stepping" options.  If GDB can't find where to
  43 # put the scratch pad, GDB should be able to fall back to stepping
  44 # past the breakpoint using an in-line step-over.
  45
  46 proc test_step_over { displaced } {
  47     global hex
  48     global binfile
  49
  50     clean_restart $binfile
  51
  52     if ![runto_main] {
  53         return -1
  54     }
  55
  56     delete_breakpoints
  57
  58     set msg "purging symbols"
  59     gdb_test_multiple "file" "$msg" {
  60         -re "Are you sure you want to change the file.*y or n. $" {
  61             send_gdb "y\n"
  62             exp_continue
  63         }
  64         -re "Discard symbol table.*y or n. $" {
  65             gdb_test "y" "No symbol file now." "$msg"
  66         }
  67     }
  68
  69     set before_addr [get_pc "get before PC"]
  70
  71     gdb_test "break *\$pc" "Breakpoint .* at $hex"
  72
  73     gdb_test_no_output "set displaced-stepping $displaced"
  74
  75     gdb_test "stepi" "$hex in \?\? .*"
  76
  77     set after_addr [get_pc "get after PC"]
  78
  79     gdb_assert {{[regexp "^${hex}$" $before_addr] \
  80                  && [regexp "^${hex}$" $after_addr] \
  81                  && $before_addr != $after_addr}} "advanced"
  82 }
  83
  84 foreach displaced { "off" "on" "auto" } {
  85     if { $displaced != "off" && ![support_displaced_stepping] } {
  86         continue
  87     }
  88
  89     with_test_prefix "displaced=$displaced" {
  90         test_step_over $displaced
  91     }
  92 }