gdb/testsuite/gdb.base/solib-display.exp

   1 # Copyright 2009-2024 Free Software Foundation, Inc.
   2 # This program is free software; you can redistribute it and/or modify
   3 # it under the terms of the GNU General Public License as published by
   4 # the Free Software Foundation; either version 3 of the License, or
   5 # (at your option) any later version.
   6 #
   7 # This program is distributed in the hope that it will be useful,
   8 # but WITHOUT ANY WARRANTY; without even the implied warranty of
   9 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10 # GNU General Public License for more details.
  11 #
  12 # You should have received a copy of the GNU General Public License
  13 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  14 #
  15 # Contributed by Paul Pluzhnikov <ppluzhnikov@google.com>
  16 #
  17
  18 # This test case verifies that if a display is active on a variable
  19 # which belongs in a shared library, and that shared library is
  20 # reloaded (e.g. due to re-execution of the program), GDB will continue
  21 # to display it (gdb-6.8 crashed under this scenario).
  22
  23 # Also test that a display of variable which is currently present in
  24 # a shared library, but disappears before re-run, doesn't cause GDB
  25 # difficulties, and that it continues to display other variables.
  26
  27 # Finally, test that displays which refer to main executable
  28 # (and thus aren't affected by shared library unloading) are not
  29 # disabled prematurely.
  30
  31 require allow_shlib_tests
  32
  33 # This test is currently not supported for stub targets, because it uses the
  34 # start command (through gdb_start_cmd).  In theory, it could be changed to
  35 # use something else (kill + gdb_run_cmd with a manual breakpoint at main).
  36 # However, when we try that with the native-gdbserver board, we see that the
  37 # test fails and gdb outputs this upon connection:
  38 #
  39 #   warning: Unable to display "a_global": No symbol "a_global" in current context.
  40 #   warning: Unable to display "b_global": No symbol "b_global" in current context.
  41 #   warning: Unable to display "c_global": No symbol "c_global" in current context.
  42 #
  43 # This is because the initial stop is done before the shared libraries are
  44 # loaded.
  45
  46 require !use_gdb_stub
  47
  48 # Library file.
  49 set libname "solib-display-lib"
  50 set srcfile_lib ${srcdir}/${subdir}/${libname}.c
  51 set binfile_lib [standard_output_file ${libname}.so]
  52 set lib_flags {}
  53 # Binary file.
  54 set testfile "solib-display-main"
  55 set srcfile ${srcdir}/${subdir}/${testfile}.c
  56 set executable ${testfile}
  57 set binfile [standard_output_file ${executable}]
  58 set bin_flags [list debug shlib=${binfile_lib}]
  59
  60 # SEP must be last for the possible `unsupported' error path.
  61 foreach libsepdebug {NO IN SEP} { with_test_prefix "$libsepdebug" {
  62
  63     set sep_lib_flags $lib_flags
  64     if {$libsepdebug != "NO"} {
  65         lappend sep_lib_flags {debug}
  66     }
  67     if { [gdb_compile_shlib ${srcfile_lib} ${binfile_lib} $sep_lib_flags] != ""
  68          || [gdb_compile ${srcfile} ${binfile} executable $bin_flags] != "" } {
  69       untested "failed to compile"
  70       return -1
  71     }
  72
  73     if {$libsepdebug == "SEP"} {
  74         if {[gdb_gnu_strip_debug $binfile_lib] != 0} {
  75             unsupported "could not split debug of $binfile_lib."
  76             return
  77         } else {
  78             pass "split solib"
  79         }
  80     }
  81
  82     clean_restart $executable
  83
  84     if {![runto_main]} {
  85       return 0
  86     }
  87
  88     gdb_test "display (int) a_global" "1: \\(int\\) a_global = 41"
  89     gdb_test "display (int) b_global" "2: \\(int\\) b_global = 42"
  90     gdb_test "display (int) c_global" "3: \\(int\\) c_global = 43"
  91
  92     if { [gdb_start_cmd] < 0 } {
  93         fail "can't run to main (2)"
  94         continue
  95     }
  96
  97     gdb_test "" [multi_line \
  98                      "1: \\(int\\) a_global = 41" \
  99                      "2: \\(int\\) b_global = 42"  \
 100                      "3: \\(int\\) c_global = 43" \
 101                     ] "after rerun"
 102
 103     # Now rebuild the library without b_global
 104     if { [gdb_compile_shlib ${srcfile_lib} ${binfile_lib} \
 105               "$sep_lib_flags additional_flags=-DNO_B_GLOBAL"] != ""} {
 106         fail "can't rebuild $binfile_lib"
 107     }
 108
 109     if {$libsepdebug == "SEP"} {
 110         set test "split solib second time"
 111         if {[gdb_gnu_strip_debug $binfile_lib] != 0} {
 112             fail $test
 113             continue
 114         } else {
 115             pass $test
 116         }
 117     }
 118
 119     if { [gdb_start_cmd] < 0 } {
 120         fail "can't run to main (3)"
 121         continue
 122     }
 123
 124
 125     gdb_test "" [multi_line \
 126                      "1: \\(int\\) a_global = 41" \
 127                      "warning: .*b_global.*"  \
 128                      "3: \\(int\\) c_global = 43" \
 129                     ] "after rerun (2)"
 130
 131     # Now verify that displays which are not in the shared library
 132     # are not cleared permaturely.
 133
 134     gdb_test "break [gdb_get_line_number "break here" ${testfile}.c]" \
 135             ".*Breakpoint.* at .*"
 136
 137     gdb_test "continue"
 138     gdb_test "display main_global" "4: main_global = 44"
 139     gdb_test "display a_local" "5: a_local = 45"
 140     gdb_test "display a_static" "6: a_static = 46"
 141
 142     if { [gdb_start_cmd] < 0 } {
 143         fail "can't run to main (4)"
 144         continue
 145     }
 146
 147     gdb_test "" "6: a_static = 46\\r\\n4: main_global = 44\\r\\n.*"
 148     gdb_test "continue" [multi_line \
 149                              "4: main_global = 44" \
 150                              "5: a_local = 45" \
 151                              "6: a_static = 46" \
 152                             ] "continue two"
 153 }}