gdb/testsuite/gdb.python/flexible-array-member.exp

   1 # Copyright 2020-2022 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 # Skip all tests if Python scripting is not enabled.
  26 if { [skip_python_tests] } { continue }
  27
  28 if { ![runto break_here] } {
  29     untested "could not run to break_here"
  30     return
  31 }
  32
  33 # The various cases are:
  34 #
  35 #  - ns: flexible array member with no size
  36 #  - zs: flexible array member with size 0 (GNU C extension that predates the
  37 #    standardization of the feature, but widely supported)
  38 #  - zso: zero-size only, a corner case where the array is the sole member of
  39 #    the structure
  40
  41 gdb_test "python ns = gdb.parse_and_eval('ns').dereference()"
  42 gdb_test "python zs = gdb.parse_and_eval('zs').dereference()"
  43 gdb_test "python zso = gdb.parse_and_eval('zso').dereference()"
  44
  45 # Print the whole structure.
  46
  47 gdb_test "python print(ns)" "{n = 3, items = $hex}"
  48 gdb_test "python print(zs)" "{n = 3, items = $hex}"
  49 gdb_test "python print(zso)" "{items = $hex}"
  50
  51 # Print all items.
  52
  53 gdb_test "python print(ns\['items'\])" "$hex"
  54 gdb_test "python print(ns\['items'\]\[0\])" "101"
  55 gdb_test "python print(ns\['items'\]\[1\])" "102"
  56 gdb_test "python print(ns\['items'\]\[2\])" "103"
  57
  58 gdb_test "python print(zs\['items'\])" "$hex"
  59 gdb_test "python print(zs\['items'\]\[0\])" "201"
  60 gdb_test "python print(zs\['items'\]\[1\])" "202"
  61 gdb_test "python print(zs\['items'\]\[2\])" "203"
  62
  63 gdb_test "python print(zso\['items'\])" "$hex"
  64 gdb_test "python print(zso\['items'\]\[0\])" "301"
  65 gdb_test "python print(zso\['items'\]\[1\])" "302"
  66 gdb_test "python print(zso\['items'\]\[2\])" "303"
  67
  68 # Check taking the address of array elements (how PR 28675 was originally
  69 # reported).
  70
  71 gdb_test "python print(ns\['items'\] == ns\['items'\]\[0\].address)" "True"
  72 gdb_test "python print(ns\['items'\]\[0\].address + 1 == ns\['items'\]\[1\].address)" "True"
  73 gdb_test "python print(zs\['items'\] == zs\['items'\]\[0\].address)" "True"
  74 gdb_test "python print(zs\['items'\]\[0\].address + 1 == zs\['items'\]\[1\].address)" "True"
  75 gdb_test "python print(zso\['items'\] == zso\['items'\]\[0\].address)" "True"
  76 gdb_test "python print(zso\['items'\]\[0\].address + 1 == zso\['items'\]\[1\].address)" "True"
  77
  78 # Verify the range attribute.  It looks a bit inconsistent that the high bound
  79 # is sometimes 0, sometimes -1.  It depends on the way the flexible array
  80 # member is specified and on the compiler version (the debug info is
  81 # different).  But that's what GDB produces today, so that's what we test.
  82
  83 gdb_test "python print(ns\['items'\].type.range())" "\\(0, 0\\)"
  84 gdb_test "python print(zs\['items'\].type.range())" "\\(0, (0|-1)\\)"
  85 gdb_test "python print(zso\['items'\].type.range())" "\\(0, (0|-1)\\)"
  86
  87 # Test the same thing, but going explicitly through the array index's range
  88 # type.
  89
  90 gdb_test "python print(ns\['items'\].type.fields()\[0\].type.range())" "\\(0, 0\\)"
  91 gdb_test "python print(zs\['items'\].type.fields()\[0\].type.range())" "\\(0, (0|-1)\\)"
  92 gdb_test "python print(zso\['items'\].type.fields()\[0\].type.range())" "\\(0, (0|-1)\\)"