gdb/testsuite/gdb.python/py-lazy-string.exp

   1 # Copyright (C) 2015-2021 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 # This file is part of the GDB testsuite.  It tests lazy string support
  17 # not tested by py-prettyprinter.exp.
  18
  19 load_lib gdb-python.exp
  20
  21 standard_testfile
  22
  23 if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
  24     return -1
  25 }
  26
  27 # Skip all tests if Python scripting is not enabled.
  28 if { [skip_python_tests] } { continue }
  29
  30 if ![runto_main ] {
  31     return -1
  32 }
  33
  34 gdb_breakpoint [gdb_get_line_number "break here"]
  35 gdb_continue_to_breakpoint "break here"
  36
  37 gdb_py_test_silent_cmd "python null = gdb.parse_and_eval(\"null\")" "get null value" 1
  38
  39 gdb_py_test_silent_cmd "python nullstr = null.lazy_string(length=0)" "create a null lazy string" 1
  40 gdb_test "python print (nullstr.length)" "0" "null lazy string length"
  41 gdb_test "python print (nullstr.address)" "0" "null lazy string address"
  42 gdb_test "python print (nullstr.type)" "const char \\*" "null lazy string type"
  43 gdb_test "python print(nullstr.value())" \
  44     "gdb.MemoryError: Cannot create a value from NULL.*Error while executing Python code." \
  45     "create value from NULL"
  46 gdb_test "python print(null.lazy_string(length=3).value())" \
  47     "gdb.MemoryError: Cannot create a lazy string with address 0x0, and a non-zero length.*Error while executing Python code." \
  48     "null lazy string with non-zero length"
  49 gdb_test "python print(null.lazy_string(length=-2))" \
  50     "ValueError: Invalid length.*Error while executing Python code." \
  51     "bad length"
  52
  53 foreach var_spec { { "ptr" "pointer" "const char \\*" -1 } \
  54                    { "array" "array" "const char \\[6\\]" 6 } \
  55                    { "typedef_ptr" "typedef pointer" "pointer" -1 } } {
  56     set var [lindex $var_spec 0]
  57     set value [lindex $var_spec 1]
  58     set type [lindex $var_spec 2]
  59     set length [lindex $var_spec 3]
  60     with_test_prefix $var {
  61         gdb_test "print $var" "\"$value\""
  62         gdb_py_test_silent_cmd "python $var = gdb.history (0)" "get value from history" 1
  63         gdb_py_test_silent_cmd "python l$var = $var.lazy_string()" "acquire lazy string" 1
  64         gdb_test "python print ($var.type)" "$type" "string type name equality"
  65         gdb_test "python print (l$var.type)" "$type" "lazy-string type name equality"
  66         gdb_test "python print (l$var.length)" "$length" "lazy string length"
  67         gdb_test "python print (l$var.value())" "\"$value\"" "lazy string value"
  68         gdb_py_test_silent_cmd "python l2$var = $var.lazy_string(length=2)" "acquire lazy string, length 2" 1
  69         gdb_test "python print (l2$var.length)" "2" "lazy string length 2"
  70         gdb_test "python print (l2$var.value())" "\"[string range $value 0 1]\"" "lazy string length 2 value"
  71         # This test will have to wait until gdb can handle it. There's no way,
  72         # currently, to internally specify an array of length zero in the C
  73         # language support.  PR 20786
  74         #gdb_test "python print ($var.lazy_string(length=0).value())" "\"\"" "empty lazy string value"
  75     }
  76 }