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

   1 # Copyright 2009-2019 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 if { [skip_shlib_tests] } {
  32     return 0
  33 }
  34
  35 # This test is currently not supported for stub targets, because it uses the
  36 # start command (through gdb_start_cmd).  In theory, it could be changed to
  37 # use something else (kill + gdb_run_cmd with a manual breakpoint at main).
  38 # However, when we try that with the native-gdbserver board, we see that the
  39 # test fails and gdb outputs this upon connection:
  40 #
  41 #   warning: Unable to display "a_global": No symbol "a_global" in current context.
  42 #   warning: Unable to display "b_global": No symbol "b_global" in current context.
  43 #   warning: Unable to display "c_global": No symbol "c_global" in current context.
  44 #
  45 # This is because the initial stop is done before the shared libraries are
  46 # loaded.
  47
  48 if { [use_gdb_stub] } {
  49     return 0
  50 }
  51
  52 # Library file.
  53 set libname "solib-display-lib"
  54 set srcfile_lib ${srcdir}/${subdir}/${libname}.c
  55 set binfile_lib [standard_output_file ${libname}.so]
  56 set lib_flags {}
  57 # Binary file.
  58 set testfile "solib-display-main"
  59 set srcfile ${srcdir}/${subdir}/${testfile}.c
  60 set executable ${testfile}
  61 set binfile [standard_output_file ${executable}]
  62 set bin_flags [list debug shlib=${binfile_lib}]
  63
  64 if [get_compiler_info] {
  65     return -1
  66 }
  67
  68 # SEP must be last for the possible `unsupported' error path.
  69 foreach libsepdebug {NO IN SEP} { with_test_prefix "$libsepdebug" {
  70
  71     set sep_lib_flags $lib_flags
  72     if {$libsepdebug != "NO"} {
  73         lappend sep_lib_flags {debug}
  74     }
  75     if { [gdb_compile_shlib ${srcfile_lib} ${binfile_lib} $sep_lib_flags] != ""
  76          || [gdb_compile ${srcfile} ${binfile} executable $bin_flags] != "" } {
  77       untested "failed to compile"
  78       return -1
  79     }
  80
  81     if {$libsepdebug == "SEP"} {
  82         if {[gdb_gnu_strip_debug $binfile_lib] != 0} {
  83             unsupported "could not split debug of $binfile_lib."
  84             return
  85         } else {
  86             pass "split solib"
  87         }
  88     }
  89
  90     clean_restart $executable
  91
  92     if ![runto_main] then {
  93       fail "can't run to main"
  94       return 0
  95     }
  96
  97     gdb_test "display (int) a_global" "1: \\(int\\) a_global = 41"
  98     gdb_test "display (int) b_global" "2: \\(int\\) b_global = 42"
  99     gdb_test "display (int) c_global" "3: \\(int\\) c_global = 43"
 100
 101     if { [gdb_start_cmd] < 0 } {
 102         fail "can't run to main (2)"
 103         continue
 104     }
 105
 106     gdb_test "" [multi_line \
 107                      "1: \\(int\\) a_global = 41" \
 108                      "2: \\(int\\) b_global = 42"  \
 109                      "3: \\(int\\) c_global = 43" \
 110                     ] "after rerun"
 111
 112     # Now rebuild the library without b_global
 113     if { [gdb_compile_shlib ${srcfile_lib} ${binfile_lib} \
 114               "$sep_lib_flags additional_flags=-DNO_B_GLOBAL"] != ""} {
 115         fail "can't rebuild $binfile_lib"
 116     }
 117
 118     if {$libsepdebug == "SEP"} {
 119         set test "split solib second time"
 120         if {[gdb_gnu_strip_debug $binfile_lib] != 0} {
 121             fail $test
 122             continue
 123         } else {
 124             pass $test
 125         }
 126     }
 127
 128     if { [gdb_start_cmd] < 0 } {
 129         fail "can't run to main (3)"
 130         continue
 131     }
 132
 133
 134     gdb_test "" [multi_line \
 135                      "1: \\(int\\) a_global = 41" \
 136                      "warning: .*b_global.*"  \
 137                      "3: \\(int\\) c_global = 43" \
 138                     ] "after rerun (2)"
 139
 140     # Now verify that displays which are not in the shared library
 141     # are not cleared permaturely.
 142
 143     gdb_test "break [gdb_get_line_number "break here" ${testfile}.c]" \
 144             ".*Breakpoint.* at .*"
 145
 146     gdb_test "continue"
 147     gdb_test "display main_global" "4: main_global = 44"
 148     gdb_test "display a_local" "5: a_local = 45"
 149     gdb_test "display a_static" "6: a_static = 46"
 150
 151     if { [gdb_start_cmd] < 0 } {
 152         fail "can't run to main (4)"
 153         continue
 154     }
 155
 156     gdb_test "" "6: a_static = 46\\r\\n4: main_global = 44\\r\\n.*"
 157     gdb_test "break [gdb_get_line_number "break here" ${testfile}.c]" \
 158             ".*Breakpoint.* at .*"
 159     gdb_test "continue" [multi_line \
 160                              "4: main_global = 44" \
 161                              "5: a_local = 45" \
 162                              "6: a_static = 46" \
 163                             ]
 164 }}