gdb/testsuite/gdb.fortran/intvar-dynamic-types.exp

   1 # Copyright 2020-2021 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 # Places a value with components that have dynamic type into a GDB
  17 # user variable, and then prints the user variable.
  18
  19 standard_testfile ".f90"
  20 load_lib "fortran.exp"
  21
  22 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \
  23     {debug f90 quiet}] } {
  24     return -1
  25 }
  26
  27 if ![fortran_runto_main] {
  28     untested "could not run to main"
  29     return -1
  30 }
  31
  32 gdb_breakpoint [gdb_get_line_number "Break here"]
  33 gdb_continue_to_breakpoint "Break here"
  34
  35 gdb_test_no_output "set \$a=some_var" "set \$a internal variable"
  36
  37 foreach var { "\$a" "some_var" } {
  38     with_test_prefix "print $var" {
  39         gdb_test "print $var" \
  40             " = \\( array_one = \\(\\(1, 1\\) \\(1, 1\\) \\(1, 1\\)\\), a_field = 5, array_two = \\(\\(2, 2, 2\\) \\(2, 2, 2\\)\\) \\)" \
  41             "print full contents"
  42
  43         gdb_test "print $var%array_one" \
  44             " = \\(\\(1, 1\\) \\(1, 1\\) \\(1, 1\\)\\)" \
  45             "print array_one field"
  46
  47         gdb_test "print $var%a_field" \
  48             " = 5" \
  49             "print a_field field"
  50
  51         gdb_test "print $var%array_two" \
  52             " = \\(\\(2, 2, 2\\) \\(2, 2, 2\\)\\)" \
  53             "print array_two field"
  54     }
  55 }
  56
  57 # Create new user variables for the fields of some_var, and show that
  58 # modifying these variables does not change the original value from
  59 # the program.
  60 gdb_test_no_output "set \$b = some_var%array_one"
  61 gdb_test_no_output "set \$c = some_var%array_two"
  62 gdb_test "print \$b" \
  63     " = \\(\\(1, 1\\) \\(1, 1\\) \\(1, 1\\)\\)"
  64 gdb_test "print \$c" \
  65     " = \\(\\(2, 2, 2\\) \\(2, 2, 2\\)\\)"
  66 gdb_test_no_output "set \$b(2,2) = 3"
  67 gdb_test_no_output "set \$c(3,1) = 4"
  68 gdb_test "print \$b" \
  69     " = \\(\\(1, 1\\) \\(1, 3\\) \\(1, 1\\)\\)" \
  70     "print \$b after a change"
  71 gdb_test "print \$c" \
  72     " = \\(\\(2, 2, 4\\) \\(2, 2, 2\\)\\)" \
  73     "print \$c after a change"
  74 gdb_test "print some_var%array_one" \
  75     " = \\(\\(1, 1\\) \\(1, 1\\) \\(1, 1\\)\\)"
  76 gdb_test "print some_var%array_two" \
  77     " = \\(\\(2, 2, 2\\) \\(2, 2, 2\\)\\)"
  78
  79 # Now modify the user variable '$a', which is a copy of 'some_var',
  80 # and then check how this change is reflected in the original
  81 # 'some_var', and the user variable $a.
  82 #
  83 # When we change 'a_field' which is a non-dynamic field within the
  84 # user variable, the change is only visible within the user variable.
  85 #
  86 # In contrast, when we change 'array_one' and 'array_two', which are
  87 # both fields of dynanic type, then the change is visible in both the
  88 # user variable and the original program variable 'some_var'.  This
  89 # makes sense if you consider the dynamic type as if it was a C
  90 # pointer with automatic indirection.
  91 gdb_test_no_output "set \$a%a_field = 3"
  92 gdb_test_no_output "set \$a%array_one(2,2) = 3"
  93 gdb_test_no_output "set \$a%array_two(3,1) = 4"
  94 gdb_test "print \$a" \
  95     " = \\( array_one = \\(\\(1, 1\\) \\(1, 3\\) \\(1, 1\\)\\), a_field = 3, array_two = \\(\\(2, 2, 4\\) \\(2, 2, 2\\)\\) \\)"
  96 gdb_test "print some_var" \
  97     " = \\( array_one = \\(\\(1, 1\\) \\(1, 3\\) \\(1, 1\\)\\), a_field = 5, array_two = \\(\\(2, 2, 4\\) \\(2, 2, 2\\)\\) \\)"