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      1 # Copyright 2009-2025 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 (at) 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 }}
    154