path: root/gdb/testsuite/gdb.python/py-format-string.exp

# Copyright (C) 2009-2019 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This file is part of the GDB testsuite.  It tests the
# gdb.Value.format_string () method.

load_lib gdb-python.exp

standard_testfile

if [get_compiler_info c++] {
    return -1
}

# Build inferior to language specification.
proc build_inferior {exefile lang} {
  global srcdir subdir srcfile testfile hex

  if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${exefile}" executable "debug $lang"] != "" } {
      untested "failed to compile in $lang mode"
      return -1
  }

  return 0
}

# Restart GDB.
proc prepare_gdb {exefile} {
  global srcdir subdir srcfile testfile hex

  gdb_exit
  gdb_start
  gdb_reinitialize_dir $srcdir/$subdir
  gdb_load ${exefile}

  # Skip all tests if Python scripting is not enabled.
  if { [skip_python_tests] } { continue }

  if ![runto_main] then {
      perror "couldn't run to breakpoint"
      return
  }

  # Load the pretty printer.
  set remote_python_file \
    [gdb_remote_download host ${srcdir}/${subdir}/${testfile}.py]
  gdb_test_no_output "source ${remote_python_file}" "load python file"

  runto_bp "break here"
}

# Set breakpoint and run to that breakpoint.
proc runto_bp {bp} {
  gdb_breakpoint [gdb_get_line_number $bp]
  gdb_continue_to_breakpoint $bp
}

# Set an option using the GDB command in $set_cmd, execute $body, and then
# restore the option using the GDB command in $unset_cmd.
proc with_temp_option { set_cmd unset_cmd body } {
  with_test_prefix $set_cmd {
    gdb_test "$set_cmd" ".*"
    uplevel 1 $body
    gdb_test "$unset_cmd" ".*"
  }
}

# A regular expression for a pointer.
set default_pointer_regexp "0x\[a-fA-F0-9\]+"

# A regular expression for a non-expanded C++ reference.
#
# Stringifying a C++ reference produces an address preceeded by a "@" in
# Python, but, by default, the C++ reference/class is expanded by the
# GDB print command.
set default_ref_regexp "@${default_pointer_regexp}"

# The whole content of the C variable a_big_string, i.e. the whole English
# alphabet repeated 10 times.
set whole_big_string ""
set alphabet "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
for {set i 0} {$i < 10} {incr i} {
  append whole_big_string $alphabet
}
unset alphabet

# Produces a potentially cut down version of $whole_big_string like GDB
# would represent it.
# $max is the maximum number of characters allowed in the string (but
# the return value may contain more to accound for the extra quotes and
# "..." added by GDB).
proc get_cut_big_string { max } {
  global whole_big_string

  set whole_size [string length $whole_big_string]
  if { $max > $whole_size } {
    return "\"${whole_big_string}\""
  }

  set cut_string [string range $whole_big_string 0 [expr $max - 1]]
  return "\"${cut_string}\"..."
}

# A dictionary mapping from C variable names to their default string
# representation when using str () or gdb.Value.format_string () with
# no arguments.
# This usually matches what the print command prints if used with no
# options, except for C++ references which are not expanded by
# default in Python.  See the comment above $default_ref_regexp.
set default_regexp_dict [dict create \
  "a_point_t"			"Pretty Point \\(42, 12\\)" \
  "a_point_t_pointer"		$default_pointer_regexp \
  "a_point_t_ref"		"Pretty Point \\(42, 12\\)" \
  "another_point"		"Pretty Point \\(123, 456\\)" \
  "a_struct_with_union"		"\\{the_union = \\{an_int = 42, a_char = 42 '\\*'\\}\\}" \
  "an_enum"			"ENUM_BAR" \
  "a_string"			"${default_pointer_regexp} \"hello world\"" \
  "a_binary_string"		"${default_pointer_regexp} \"hello\"" \
  "a_binary_string_array"	"\"hello\\\\000world\"" \
  "a_big_string"		[get_cut_big_string 200] \
  "an_array"			"\\{2, 3, 5\\}" \
  "an_array_with_repetition"	"\\{1, 3 <repeats 12 times>, 5, 5, 5\\}" \
  "a_symbol_pointer"		"${default_pointer_regexp} <global_symbol>" \
  "a_base_ref"			"${default_ref_regexp}" \
  ]

# A sentinel value to pass to function to get them to use a default value
# instead.
# Note that we cannot use $undefined for default arguments in function
# definitions as we would just get the literal "$undefined" string, so
# we need to repeat the string.
set undefined "\000UNDEFINED\000"

# Return $value if it's not $undefined, otherwise return the default value
# (from $default_regexp_dict) for the variable $var.
proc get_value_or_default { var value } {
  global undefined
  if { $value != $undefined } {
    return $value
  }

  global default_regexp_dict
  return [dict get $default_regexp_dict $var]
}

# Check that using gdb.Value.format_string on the value representing the
# variable $var produces $expected.
proc check_format_string {
	var
	opts
	{ expected "\000UNDEFINED\000" }
	{ name "\000UNDEFINED\000" }
  } {
  global undefined

  set expected [get_value_or_default $var $expected]
  if { $name == $undefined } {
    set name "${var} with option ${opts}"
  }

  gdb_test \
    "python print (gdb.parse_and_eval ('${var}').format_string (${opts}))" \
    $expected \
    $name
}

# Check that printing $var with no options set, produces the expected
# output.
proc check_var_with_no_opts {
	var
	{ expected "\000UNDEFINED\000" }
  } {
  set expected [get_value_or_default $var $expected]

  with_test_prefix "${var}" {
    check_format_string \
      $var \
      "" \
      $expected \
      "no opts"
    # str () should behave like gdb.Value.format_string () with no args.
    gdb_test \
      "python print (str (gdb.parse_and_eval ('${var}')))" \
      $expected \
      "str"
  }
}

# Check that printing $var with $opt set to True and set to False,
# produces the expected output.
proc check_var_with_bool_opt {
	opt
	var
	{ true_expected  "\000UNDEFINED\000" }
	{ false_expected "\000UNDEFINED\000" }
  } {
  set true_expected  [get_value_or_default $var $true_expected]
  set false_expected [get_value_or_default $var $false_expected]

  with_test_prefix "${var} with option ${opt}" {
    # Option set to True.
    check_format_string \
      $var \
      "${opt}=True" \
      $true_expected \
      "${opt}=true"
    # Option set to False.
    check_format_string \
      $var \
      "${opt}=False" \
      $false_expected \
      "${opt}=false"
  }
}

# Test gdb.Value.format_string with no options.
proc test_no_opts {} {
  global current_lang

  check_var_with_no_opts "a_point_t"
  check_var_with_no_opts "a_point_t_pointer"
  check_var_with_no_opts "another_point"
  check_var_with_no_opts "a_struct_with_union"
  check_var_with_no_opts "an_enum"
  check_var_with_no_opts "a_string"
  check_var_with_no_opts "a_binary_string"
  check_var_with_no_opts "a_binary_string_array"
  check_var_with_no_opts "a_big_string"
  check_var_with_no_opts "an_array"
  check_var_with_no_opts "an_array_with_repetition"
  check_var_with_no_opts "a_symbol_pointer"

  if { $current_lang == "c++" } {
    # Nothing changes in all of the C++ tests because deref_refs is not
    # True.
    check_var_with_no_opts "a_point_t_ref"
    check_var_with_no_opts "a_base_ref"
  }
}

# Test the raw option for gdb.Value.format_string.
proc test_raw {} {
  global current_lang
  global default_ref_regexp

  check_var_with_bool_opt "raw" "a_point_t" \
    "{x = 42, y = 12}"
  check_var_with_bool_opt "raw" "a_point_t_pointer"
  check_var_with_bool_opt "raw" "another_point" \
    "{x = 123, y = 456}"
  check_var_with_bool_opt "raw" "a_struct_with_union"
  check_var_with_bool_opt "raw" "an_enum"
  check_var_with_bool_opt "raw" "a_string"
  check_var_with_bool_opt "raw" "a_binary_string"
  check_var_with_bool_opt "raw" "a_binary_string_array"
  check_var_with_bool_opt "raw" "a_big_string"
  check_var_with_bool_opt "raw" "an_array"
  check_var_with_bool_opt "raw" "an_array_with_repetition"
  check_var_with_bool_opt "raw" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "raw" "a_point_t_ref" \
      ${default_ref_regexp}
    check_var_with_bool_opt "raw" "a_base_ref"
  }

  with_temp_option \
	"disable pretty-printer '' test_lookup_function" \
	"enable pretty-printer '' test_lookup_function" {
    check_var_with_no_opts "a_point_t" \
      "{x = 42, y = 12}"
    check_var_with_bool_opt "raw" "a_point_t" \
      "{x = 42, y = 12}" \
      "{x = 42, y = 12}"
  }
}

# Test the pretty_arrays option for gdb.Value.format_string.
proc test_pretty_arrays {} {
  global current_lang

  set an_array_pretty "  \\{2,\[\r\n\]+  3,\[\r\n\]+  5\\}"
  set an_array_with_repetition_pretty \
    "  \\{1,\[\r\n\]+  3 <repeats 12 times>,\[\r\n\]+  5,\[\r\n\]+  5,\[\r\n\]+  5\\}"

  check_var_with_bool_opt "pretty_arrays" "a_point_t"
  check_var_with_bool_opt "pretty_arrays" "a_point_t_pointer"
  check_var_with_bool_opt "pretty_arrays" "another_point"
  check_var_with_bool_opt "pretty_arrays" "a_struct_with_union"
  check_var_with_bool_opt "pretty_arrays" "an_enum"
  check_var_with_bool_opt "pretty_arrays" "a_string"
  check_var_with_bool_opt "pretty_arrays" "a_binary_string"
  check_var_with_bool_opt "pretty_arrays" "a_binary_string_array"
  check_var_with_bool_opt "pretty_arrays" "a_big_string"
  check_var_with_bool_opt "pretty_arrays" "an_array" \
    $an_array_pretty
  check_var_with_bool_opt "pretty_arrays" "an_array_with_repetition" \
    $an_array_with_repetition_pretty
  check_var_with_bool_opt "pretty_arrays" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "pretty_arrays" "a_point_t_ref"
    check_var_with_bool_opt "pretty_arrays" "a_base_ref"
  }

  with_temp_option "set print array on" "set print array off" {
    check_var_with_no_opts "an_array" \
      $an_array_pretty
    check_var_with_bool_opt "pretty_arrays" "an_array" \
      $an_array_pretty

    check_var_with_no_opts "an_array_with_repetition" \
      $an_array_with_repetition_pretty
    check_var_with_bool_opt "pretty_arrays" "an_array_with_repetition" \
      $an_array_with_repetition_pretty
  }
}

# Test the pretty_structs option for gdb.Value.format_string.
proc test_pretty_structs {} {
  global current_lang

  set a_struct_with_union_pretty \
    "\\{\[\r\n\]+  the_union = \\{\[\r\n\]+    an_int = 42,\[\r\n\]+    a_char = 42 '\\*'\[\r\n\]+  \\}\[\r\n\]+\\}"

  check_var_with_bool_opt "pretty_structs" "a_point_t"
  check_var_with_bool_opt "pretty_structs" "a_point_t_pointer"
  check_var_with_bool_opt "pretty_structs" "another_point"
  check_var_with_bool_opt "pretty_structs" "a_struct_with_union" \
    $a_struct_with_union_pretty
  check_var_with_bool_opt "pretty_structs" "an_enum"
  check_var_with_bool_opt "pretty_structs" "a_string"
  check_var_with_bool_opt "pretty_structs" "a_binary_string"
  check_var_with_bool_opt "pretty_structs" "a_binary_string_array"
  check_var_with_bool_opt "pretty_structs" "a_big_string"
  check_var_with_bool_opt "pretty_structs" "an_array"
  check_var_with_bool_opt "pretty_structs" "an_array_with_repetition"
  check_var_with_bool_opt "pretty_structs" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "pretty_structs" "a_point_t_ref"
    check_var_with_bool_opt "pretty_structs" "a_base_ref"
  }

  with_temp_option "set print structs on" "set print structs off" {
    check_var_with_no_opts "a_struct_with_union"
    check_var_with_bool_opt "pretty_structs" "a_struct_with_union" \
      $a_struct_with_union_pretty
  }

  # point_t is usually printed through the pretty printer.
  # Try disabling it.
  with_temp_option \
	"disable pretty-printer '' test_lookup_function" \
	"enable pretty-printer '' test_lookup_function" {
    check_var_with_no_opts "a_point_t" \
      "{x = 42, y = 12}"
    check_var_with_bool_opt "pretty_structs" "a_point_t" \
      "\\{\[\r\n\]+  x = 42, *\[\r\n\]+  y = 12\[\r\n\]+\\}" \
      "{x = 42, y = 12}" \
  }
}

# Test the array_indexes option for gdb.Value.format_string.
proc test_array_indexes {} {
  global current_lang

  set an_array_with_indexes "\\{\\\[0\\\] = 2, \\\[1\\\] = 3, \\\[2\\\] = 5\\}"
  set an_array_with_repetition_with_indexes \
    "\\{\\\[0\\\] = 1, \\\[1\\\] = 3 <repeats 12 times>, \\\[13\\\] = 5, \\\[14\\\] = 5, \\\[15\\\] = 5\\}"

  check_var_with_bool_opt "array_indexes" "a_point_t"
  check_var_with_bool_opt "array_indexes" "a_point_t_pointer"
  check_var_with_bool_opt "array_indexes" "another_point"
  check_var_with_bool_opt "array_indexes" "a_struct_with_union"
  check_var_with_bool_opt "array_indexes" "an_enum"
  check_var_with_bool_opt "array_indexes" "a_string"
  check_var_with_bool_opt "array_indexes" "a_binary_string"
  check_var_with_bool_opt "array_indexes" "a_binary_string_array"
  check_var_with_bool_opt "array_indexes" "a_big_string"
  check_var_with_bool_opt "array_indexes" "an_array" \
    $an_array_with_indexes
  check_var_with_bool_opt "array_indexes" "an_array_with_repetition" \
    $an_array_with_repetition_with_indexes
  check_var_with_bool_opt "array_indexes" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "array_indexes" "a_point_t_ref"
    check_var_with_bool_opt "array_indexes" "a_base_ref"
  }

  with_temp_option \
	"set print array-indexes on" \
	"set print array-indexes off" {
    check_var_with_no_opts "an_array" \
      $an_array_with_indexes
    check_var_with_bool_opt "array_indexes" "an_array" \
      $an_array_with_indexes

    check_var_with_no_opts "an_array_with_repetition" \
      $an_array_with_repetition_with_indexes
    check_var_with_bool_opt "array_indexes" "an_array_with_repetition" \
      $an_array_with_repetition_with_indexes
  }
}

# Test the symbols option for gdb.Value.format_string.
proc test_symbols {} {
  global undefined
  global current_lang
  global default_pointer_regexp

  check_var_with_bool_opt "symbols" "a_point_t"
  check_var_with_bool_opt "symbols" "a_point_t_pointer"
  check_var_with_bool_opt "symbols" "another_point"
  check_var_with_bool_opt "symbols" "a_struct_with_union"
  check_var_with_bool_opt "symbols" "an_enum"
  check_var_with_bool_opt "symbols" "a_string"
  check_var_with_bool_opt "symbols" "a_binary_string"
  check_var_with_bool_opt "symbols" "a_binary_string_array"
  check_var_with_bool_opt "symbols" "a_big_string"
  check_var_with_bool_opt "symbols" "an_array"
  check_var_with_bool_opt "symbols" "an_array_with_repetition"
  check_var_with_bool_opt "symbols" "a_symbol_pointer" \
    $undefined \
    $default_pointer_regexp

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "symbols" "a_point_t_ref"
    check_var_with_bool_opt "symbols" "a_base_ref"
  }

  with_temp_option "set print symbol off" "set print symbol on" {
    check_var_with_no_opts "a_symbol_pointer" \
      $default_pointer_regexp
    check_var_with_bool_opt "symbols" "a_symbol_pointer" \
      $undefined \
      $default_pointer_regexp
  }
}

# Test the unions option for gdb.Value.format_string.
proc test_unions {} {
  global undefined
  global current_lang

  check_var_with_bool_opt "unions" "a_point_t"
  check_var_with_bool_opt "unions" "a_point_t_pointer"
  check_var_with_bool_opt "unions" "another_point"
  check_var_with_bool_opt "unions" "a_struct_with_union" \
    $undefined \
    "\\{the_union = \\{...\\}\\}"
  check_var_with_bool_opt "unions" "an_enum"
  check_var_with_bool_opt "unions" "a_string"
  check_var_with_bool_opt "unions" "a_binary_string"
  check_var_with_bool_opt "unions" "a_binary_string_array"
  check_var_with_bool_opt "unions" "a_big_string"
  check_var_with_bool_opt "unions" "an_array"
  check_var_with_bool_opt "unions" "an_array_with_repetition"
  check_var_with_bool_opt "unions" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "unions" "a_point_t_ref"
    check_var_with_bool_opt "unions" "a_base_ref"
  }

  with_temp_option "set print union off" "set print union on" {
    check_var_with_no_opts "a_struct_with_union" \
      "\\{the_union = \\{...\\}\\}"
    check_var_with_bool_opt "unions" "a_struct_with_union" \
      $undefined \
      "\\{the_union = \\{...\\}\\}"
  }
}

# Test the deref_refs option for gdb.Value.format_string.
proc test_deref_refs {} {
  global current_lang
  global default_pointer_regexp
  global default_ref_regexp

  check_var_with_bool_opt "deref_refs" "a_point_t"
  check_var_with_bool_opt "deref_refs" "a_point_t_pointer"
  check_var_with_bool_opt "deref_refs" "another_point"
  check_var_with_bool_opt "deref_refs" "a_struct_with_union"
  check_var_with_bool_opt "deref_refs" "an_enum"
  check_var_with_bool_opt "deref_refs" "a_string"
  check_var_with_bool_opt "deref_refs" "a_binary_string"
  check_var_with_bool_opt "deref_refs" "a_binary_string_array"
  check_var_with_bool_opt "deref_refs" "a_big_string"
  check_var_with_bool_opt "deref_refs" "an_array"
  check_var_with_bool_opt "deref_refs" "an_array_with_repetition"
  check_var_with_bool_opt "deref_refs" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    check_var_with_bool_opt "deref_refs" "a_point_t_ref"
    check_var_with_bool_opt "deref_refs" "a_base_ref" \
      "${default_ref_regexp}: \\{_vptr\\.Base = ${default_pointer_regexp} <vtable for Deriv\\+16>, a = 42, static a_static_member = 2019\\}"
  }
}

# Test the actual_objects option for gdb.Value.format_string.
proc test_actual_objects {} {
  global current_lang

  check_var_with_bool_opt "actual_objects" "a_point_t"
  check_var_with_bool_opt "actual_objects" "a_point_t_pointer"
  check_var_with_bool_opt "actual_objects" "another_point"
  check_var_with_bool_opt "actual_objects" "a_struct_with_union"
  check_var_with_bool_opt "actual_objects" "an_enum"
  check_var_with_bool_opt "actual_objects" "a_string"
  check_var_with_bool_opt "actual_objects" "a_binary_string"
  check_var_with_bool_opt "actual_objects" "a_binary_string_array"
  check_var_with_bool_opt "actual_objects" "a_big_string"
  check_var_with_bool_opt "actual_objects" "an_array"
  check_var_with_bool_opt "actual_objects" "an_array_with_repetition"
  check_var_with_bool_opt "actual_objects" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    # Nothing changes in all of the C++ tests because deref_refs is not
    # True.
    check_var_with_bool_opt "actual_objects" "a_point_t_ref"
    check_var_with_bool_opt "actual_objects" "a_base_ref"

    with_temp_option "set print object on" "set print object off" {
      check_var_with_no_opts "a_point_t_ref"
      check_var_with_bool_opt "actual_objects" "a_point_t_ref"

      check_var_with_no_opts "a_base_ref"
      check_var_with_bool_opt "actual_objects" "a_base_ref"
    }
  }
}

# Test the static_members option for gdb.Value.format_string.
proc test_static_members {} {
  global current_lang

  check_var_with_bool_opt "static_members" "a_point_t"
  check_var_with_bool_opt "static_members" "a_point_t_pointer"
  check_var_with_bool_opt "static_members" "another_point"
  check_var_with_bool_opt "static_members" "a_struct_with_union"
  check_var_with_bool_opt "static_members" "an_enum"
  check_var_with_bool_opt "static_members" "a_string"
  check_var_with_bool_opt "static_members" "a_binary_string"
  check_var_with_bool_opt "static_members" "a_binary_string_array"
  check_var_with_bool_opt "static_members" "a_big_string"
  check_var_with_bool_opt "static_members" "an_array"
  check_var_with_bool_opt "static_members" "an_array_with_repetition"
  check_var_with_bool_opt "static_members" "a_symbol_pointer"

  if { $current_lang == "c++" } {
    # Nothing changes in all of the C++ tests because deref_refs is not
    # True.
    check_var_with_bool_opt "static_members" "a_point_t_ref"
    check_var_with_bool_opt "static_members" "a_base_ref"

    with_temp_option \
	"set print static-members off" \
	"set print static-members on" {
      check_var_with_no_opts "a_point_t_ref"
      check_var_with_bool_opt "static_members" "a_point_t_ref"

      check_var_with_no_opts "a_base_ref"
      check_var_with_bool_opt "static_members" "a_base_ref"
    }
  }
}

# Test the max_elements option for gdb.Value.format_string.
proc test_max_elements {} {
  global current_lang
  global default_pointer_regexp

  # 200 is the default maximum number of elements, so setting it should
  # not change the output.
  set opts "max_elements=200"
  with_test_prefix $opts {
    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts
    check_format_string "an_enum" $opts
    check_format_string "a_string" $opts
    check_format_string "a_binary_string" $opts
    check_format_string "a_binary_string_array" $opts
    check_format_string "a_big_string" $opts
    check_format_string "an_array" $opts
    check_format_string "an_array_with_repetition" $opts
    check_format_string "a_symbol_pointer" $opts

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }

  set opts "max_elements=3"
  with_test_prefix $opts {
    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts
    check_format_string "an_enum" $opts
    check_format_string "a_string" $opts \
      "${default_pointer_regexp} \"hel\"..."
    check_format_string "a_binary_string" $opts \
      "${default_pointer_regexp} \"hel\"..."
    # This will print four characters instead of three, see
    # <https://sourceware.org/bugzilla/show_bug.cgi?id=24331>.
    check_format_string "a_binary_string_array" $opts \
      "\"hell\"..."
    check_format_string "a_big_string" $opts \
      [get_cut_big_string 3]
    check_format_string "an_array" $opts
    check_format_string "an_array_with_repetition" $opts \
      "\\{1, 3 <repeats 12 times>...\\}"
    check_format_string "a_symbol_pointer" $opts

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }

  # Both 1,000 (we don't have that many elements) and 0 (unlimited) should
  # mean no truncation.
  foreach opts { "max_elements=1000" "max_elements=0" } {
    with_test_prefix $opts {
      check_format_string "a_point_t" $opts
      check_format_string "a_point_t_pointer" $opts
      check_format_string "another_point" $opts
      check_format_string "a_struct_with_union" $opts
      check_format_string "an_enum" $opts
      check_format_string "a_string" $opts
      check_format_string "a_binary_string" $opts
      check_format_string "a_binary_string_array" $opts
      check_format_string "a_big_string" $opts \
        [get_cut_big_string 1000]
      check_format_string "an_array" $opts
      check_format_string "an_array_with_repetition" $opts
      check_format_string "a_symbol_pointer" $opts

      if { $current_lang == "c++" } {
        check_format_string "a_point_t_ref" $opts
        check_format_string "a_base_ref" $opts
      }
    }
  }

  with_temp_option "set print elements 4" "set print elements 200" {
    check_format_string "a_string" "" \
      "${default_pointer_regexp} \"hell\"..."
    check_format_string "a_binary_string" "" \
      "${default_pointer_regexp} \"hell\"..."
    check_format_string "a_binary_string_array" "" \
      "\"hell\"..."
    check_format_string "an_array_with_repetition" "" \
      "\\{1, 3 <repeats 12 times>...\\}"
  }
}

# Test the max_depth option for gdb.Value.format_string.
proc test_max_depth {} {
    set opts "max_depth=-1"
    with_test_prefix $opts {
	check_format_string "a_struct_with_union" $opts
    }
    set opts "max_depth=0"
    with_test_prefix $opts {
	check_format_string "a_struct_with_union" $opts "\\{\.\.\.\\}"
    }
    set opts "max_depth=1"
    with_test_prefix $opts {
	check_format_string "a_struct_with_union" $opts "\\{the_union = \\{\.\.\.\\}\\}"
    }
    set opts "max_depth=2"
    with_test_prefix $opts {
	check_format_string "a_struct_with_union" $opts
    }
}

# Test the repeat_threshold option for gdb.Value.format_string.
proc test_repeat_threshold {} {
  global current_lang
  global default_pointer_regexp

  # 10 is the default threshold for repeated items, so setting it should
  # not change the output.
  set opts "repeat_threshold=10"
  with_test_prefix $opts {
    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts
    check_format_string "an_enum" $opts
    check_format_string "a_string" $opts
    check_format_string "a_binary_string" $opts
    check_format_string "a_binary_string_array" $opts
    check_format_string "a_big_string" $opts
    check_format_string "an_array" $opts
    check_format_string "an_array_with_repetition" $opts
    check_format_string "a_symbol_pointer" $opts

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }

  set opts "repeat_threshold=1"
  with_test_prefix $opts {
    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts
    check_format_string "an_enum" $opts
    check_format_string "a_string" $opts \
      "${default_pointer_regexp} \"he\", 'l' <repeats 2 times>, \"o world\""
    check_format_string "a_binary_string" $opts \
      "${default_pointer_regexp} \"he\", 'l' <repeats 2 times>, \"o\""
    check_format_string "a_binary_string_array" $opts \
      "\"he\", 'l' <repeats 2 times>, \"o\\\\000world\""
    check_format_string "a_big_string" $opts
    check_format_string "an_array" $opts
    check_format_string "an_array_with_repetition" $opts \
      "\\{1, 3 <repeats 12 times>, 5 <repeats 3 times>\\}"

    check_format_string "a_symbol_pointer" $opts

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }

  set opts "repeat_threshold=3"
  with_test_prefix $opts {
    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts
    check_format_string "an_enum" $opts
    check_format_string "a_string" $opts
    check_format_string "a_binary_string" $opts
    check_format_string "a_binary_string_array" $opts
    check_format_string "a_big_string" $opts
    check_format_string "an_array" $opts
    check_format_string "an_array_with_repetition" $opts
    check_format_string "a_symbol_pointer" $opts

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }

  # Both 100 (we don't have that many repeated elements) and 0 (unlimited)
  # should mean no truncation.
  foreach opts { "repeat_threshold=100" "repeat_threshold=0" } {
    with_test_prefix $opts {
      check_format_string "a_point_t" $opts
      check_format_string "a_point_t_pointer" $opts
      check_format_string "another_point" $opts
      check_format_string "a_struct_with_union" $opts
      check_format_string "an_enum" $opts
      check_format_string "a_string" $opts
      check_format_string "a_binary_string" $opts
      check_format_string "a_binary_string_array" $opts
      check_format_string "a_big_string" $opts
      check_format_string "an_array" $opts
      check_format_string "an_array_with_repetition" $opts \
        "\\{1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 5, 5\\}"
      check_format_string "a_symbol_pointer" $opts

      if { $current_lang == "c++" } {
        check_format_string "a_point_t_ref" $opts
        check_format_string "a_base_ref" $opts
      }
    }
  }

  with_temp_option "set print repeats 1" "set print repeats 10" {
    check_format_string "an_array_with_repetition" "" \
      "\\{1, 3 <repeats 12 times>, 5 <repeats 3 times>\\}"
  }
}

# Test the format option for gdb.Value.format_string.
proc test_format {} {
  global current_lang
  global default_pointer_regexp

  # Hexadecimal.
  set opts "format='x'"
  with_test_prefix $opts {
    gdb_test "python print (gdb.Value (42).format_string (${opts}))" \
      "0x2a" \
      "42 with option ${opts}"

    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts \
      "\\{the_union = \\{an_int = 0x2a, a_char = 0x2a\\}\\}"
    check_format_string "an_enum" $opts \
      "0x1"
    check_format_string "a_string" $opts \
      $default_pointer_regexp
    check_format_string "a_binary_string" $opts \
      $default_pointer_regexp
    check_format_string "a_binary_string_array" $opts \
      "\\{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x0, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x0\\}"
    check_format_string "a_big_string" $opts \
      "\\{0x41, 0x42, 0x43, 0x44, 0x45, \[, x0-9a-f\]+\.\.\.\\}"
    check_format_string "an_array" $opts \
      "\\{0x2, 0x3, 0x5\\}"
    check_format_string "an_array_with_repetition" $opts \
      "\\{0x1, 0x3 <repeats 12 times>, 0x5, 0x5, 0x5\\}"
    check_format_string "a_symbol_pointer" $opts \
      $default_pointer_regexp

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }

  # Decimal.
  set opts "format='d'"
  with_test_prefix $opts {
    set decimal_pointer_regexp "\[0-9\]+"
    gdb_test "python print (gdb.Value (0x2a).format_string (${opts}))" \
      "42" \
      "0x2a with option ${opts}"

    check_format_string "a_point_t" $opts
    check_format_string "a_point_t_pointer" $opts \
      $decimal_pointer_regexp
    check_format_string "another_point" $opts
    check_format_string "a_struct_with_union" $opts \
      "\\{the_union = \\{an_int = 42, a_char = 42\\}\\}"
    check_format_string "an_enum" $opts \
      "1"
    check_format_string "a_string" $opts \
      $decimal_pointer_regexp
    check_format_string "a_binary_string" $opts \
      $decimal_pointer_regexp
    check_format_string "a_binary_string_array" $opts \
      "\\{104, 101, 108, 108, 111, 0, 119, 111, 114, 108, 100, 0\\}"
    check_format_string "a_big_string" $opts \
      "\\{65, 66, 67, 68, 69, \[, 0-9\]+\.\.\.\\}"
    check_format_string "an_array" $opts
    check_format_string "an_array_with_repetition" $opts
    check_format_string "a_symbol_pointer" $opts \
      $decimal_pointer_regexp

    if { $current_lang == "c++" } {
      check_format_string "a_point_t_ref" $opts
      check_format_string "a_base_ref" $opts
    }
  }
}

# Test mixing options.
proc test_mixed {} {
  global current_lang
  global default_ref_regexp
  global default_pointer_regexp

  check_format_string "a_point_t" \
    "raw=True, format='x'" \
    "\\{x = 0x2a, y = 0xc\\}"

  check_format_string "an_array" \
    "array_indexes=True, pretty_arrays=True" \
    "  \\{\\\[0\\\] = 2,\[\r\n\]+  \\\[1\\\] = 3,\[\r\n\]+  \\\[2\\\] = 5\\}"

  check_format_string "a_struct_with_union" \
    "pretty_structs=True, unions=False" \
    "\\{\[\r\n\]+  the_union = \\{\.\.\.\\}\[\r\n\]+\\}"

  check_format_string "a_symbol_pointer" \
    "symbols=False, format='d'" \
    "\[0-9\]+"

  if { $current_lang == "c++" } {
    check_format_string "a_point_t_ref" \
      "deref_refs=True, actual_objects=True, raw=True" \
      "${default_ref_regexp}: \\{x = 42, y = 12\\}"

    check_format_string "a_base_ref" \
      "deref_refs=True, static_members=False" \
      "${default_ref_regexp}: \\{_vptr\\.Base = ${default_pointer_regexp} <vtable for Deriv\\+16>, a = 42\\}"
  }
}

# Test passing invalid arguments to gdb.Value.format_string.
proc test_invalid_args {} {
  check_format_string \
    "a_point_t" \
    "12" \
    "TypeError: format_string\\(\\) takes 0 positional arguments but 1 were given.*"

  check_format_string \
    "a_point_t" \
    "invalid=True" \
    "TypeError: 'invalid' is an invalid keyword argument for this function.*"

  check_format_string \
    "a_point_t" \
    "raw='hello'" \
    "TypeError: argument 1 must be bool, not str.*"

  check_format_string \
    "a_point_t" \
    "format='xd'" \
    "ValueError: a single character is required.*"
}

# Run all the tests in common for both C and C++.
proc test_all_common {} {
  # No options.
  test_no_opts
  # Single options set to True/False.
  test_raw
  test_pretty_arrays
  test_pretty_structs
  test_array_indexes
  test_symbols
  test_unions
  test_deref_refs
  test_actual_objects
  test_static_members
  test_max_elements
  test_max_depth
  test_repeat_threshold
  test_format
  # Multiple options mixed together.
  test_mixed
  # Various error conditions.
  test_invalid_args
}

# The current language ("c" or "c++" while running tests).
set current_lang ""

with_test_prefix "format_string" {
  # Perform C Tests.
  if { [build_inferior "${binfile}" "c"] == 0 } {
    with_test_prefix "lang_c" {
      set current_lang "c"
      prepare_gdb "${binfile}"
      test_all_common
    }
  }

  # Perform C++ Tests.
  if { [build_inferior "${binfile}-cxx" "c++"] == 0 } {
    with_test_prefix "lang_cpp" {
      set current_lang "c++"
      prepare_gdb "${binfile}-cxx"
      test_all_common
    }
  }
}