gdb/testsuite/gdb.python/flexible-array-member.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 # Test getting the range of flexible array members in Python.
  17
  18 standard_testfile
  19
  20 if { [prepare_for_testing "failed to prepare" \
  21         ${testfile} ${srcfile}] } {
  22     return
  23 }
  24
  25 if { ![runto break_here] } {
  26     untested "could not run to break_here"
  27     return
  28 }
  29
  30 # The various cases are:
  31 #
  32 #  - ns: flexible array member with no size
  33 #  - zs: flexible array member with size 0 (GNU C extension that predates the
  34 #    standardization of the feature, but widely supported)
  35 #  - zso: zero-size only, a corner case where the array is the sole member of
  36 #    the structure
  37
  38 gdb_test "python ns = gdb.parse_and_eval('ns').dereference()"
  39 gdb_test "python zs = gdb.parse_and_eval('zs').dereference()"
  40 gdb_test "python zso = gdb.parse_and_eval('zso').dereference()"
  41
  42 # Print the whole structure.
  43
  44 gdb_test "python print(ns)" "{n = 3, items = $hex}"
  45 gdb_test "python print(zs)" "{n = 3, items = $hex}"
  46 gdb_test "python print(zso)" "{items = $hex}"
  47
  48 # Print all items.
  49
  50 gdb_test "python print(ns\['items'\])" "$hex"
  51 gdb_test "python print(ns\['items'\]\[0\])" "101"
  52 gdb_test "python print(ns\['items'\]\[1\])" "102"
  53 gdb_test "python print(ns\['items'\]\[2\])" "103"
  54
  55 gdb_test "python print(zs\['items'\])" "$hex"
  56 gdb_test "python print(zs\['items'\]\[0\])" "201"
  57 gdb_test "python print(zs\['items'\]\[1\])" "202"
  58 gdb_test "python print(zs\['items'\]\[2\])" "203"
  59
  60 gdb_test "python print(zso\['items'\])" "$hex"
  61 gdb_test "python print(zso\['items'\]\[0\])" "301"
  62 gdb_test "python print(zso\['items'\]\[1\])" "302"
  63 gdb_test "python print(zso\['items'\]\[2\])" "303"
  64
  65 # Check taking the address of array elements (how PR 28675 was originally
  66 # reported).
  67
  68 gdb_test "python print(ns\['items'\] == ns\['items'\]\[0\].address)" "True"
  69 gdb_test "python print(ns\['items'\]\[0\].address + 1 == ns\['items'\]\[1\].address)" "True"
  70 gdb_test "python print(zs\['items'\] == zs\['items'\]\[0\].address)" "True"
  71 gdb_test "python print(zs\['items'\]\[0\].address + 1 == zs\['items'\]\[1\].address)" "True"
  72 gdb_test "python print(zso\['items'\] == zso\['items'\]\[0\].address)" "True"
  73 gdb_test "python print(zso\['items'\]\[0\].address + 1 == zso\['items'\]\[1\].address)" "True"
  74
  75 # Verify the range attribute.  It looks a bit inconsistent that the high bound
  76 # is sometimes 0, sometimes -1, but that's what GDB produces today, so that's
  77 # what we test.
  78
  79 gdb_test "python print(ns\['items'\].type.range())" "\\(0, 0\\)"
  80 gdb_test "python print(zs\['items'\].type.range())" "\\(0, -1\\)"
  81 gdb_test "python print(zso\['items'\].type.range())" "\\(0, -1\\)"