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# This testcase is part of GDB, the GNU debugger.
# Copyright 2017-2021 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
# 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 <>.
# Test GDB's awareness of the wchar_t (C++98+) and char16_t, char32_t
# (C++11+) built-in types. We also run most tests here in C mode, and
# check whether the built-ins are disabled (gdb uses the typedefs in
# the debug info instead.)
# Test char16_t/char32_t/wchar_t in language LANG, against symbols in
# a program. Lang can be "c", "c++03" or "c++11". In C++11,
# char16_t/char32_t are built-in types, and the debug information
# reflects that (see
proc wide_char_types_program {lang} {
global srcfile testfile
set options {debug}
if {$lang == "c++03"} {
lappend options c++ additional_flags=-std=c++03
set out $testfile-cxx03
} elseif {$lang == "c++11"} {
lappend options c++ additional_flags=-std=c++11
set out $testfile-cxx11
} else {
set out $testfile-c
if { [prepare_for_testing "failed to prepare" \
${out} [list $srcfile] $options] } {
return -1
if ![runto_main] then {
return 0
do_test_wide_char $lang "u16" "u32" "wchar"
# Test char16_t/char32_t/wchar_t in language LANG. Use CHAR16_EXP,
# CHAR32_EXP, and WCHAR_EXP as expression for each of the
# corresponding types. (E.g., CHAR16_EXP will be u16 when testing
# against the program, and "(char16_t)-1" when testing the built-in
# types without a program loaded.)
proc do_test_wide_char {lang char16_exp char32_exp wchar_exp} {
global gdb_prompt
# Check that the fixed-width wide types are distinct built-in
# types in C++11+. In other modes, they're instead typedefs,
# found in the debug info.
if {$lang == "c++11"} {
gdb_test "ptype $char16_exp" "type = char16_t" \
"char16_t is distinct"
gdb_test "ptype $char32_exp" "type = char32_t" \
"char32_t is distinct"
} else {
gdb_test "ptype $char16_exp" "type = unsigned (long|int|short)" \
"char16_t is typedef"
gdb_test "ptype $char32_exp" "type = unsigned (long|int|short)" \
"char32_t is typedef"
# wchar_t is a disctinct built-in type in C++03+.
if {$lang != "c"} {
gdb_test "ptype $wchar_exp" "type = wchar_t" \
"wchar_t is distinct"
} else {
gdb_test "ptype $wchar_exp" "type = (unsigned )?(long|int|short)" \
"wchar_t is typedef"
# Check that the fixed-width wide char types are unsigned.
gdb_test "p $char16_exp" " = 65535 u'\\\\xffff'" \
"char16_t is unsigned"
gdb_test "p $char32_exp" " = 4294967295 U'\\\\xffffffff'" \
"char32_t is unsigned"
# Whether wchar_t is signed is implementation-dependent. While we
# ignore whether GDB got the ABI size/sign details right here,
# this at least verifies that the value isn't garbage, and that
# GDB correctly outputs the character using the "L" prefix.
set test "wchar_t sign"
gdb_test_multiple "p $wchar_exp" $test {
-re " = 4294967295 L'\\\\xffffffff'\r\n$gdb_prompt $" {
pass "$test (unsigned)"
-re " = 65535 L'\\\\xffff'\r\n$gdb_prompt $" {
pass "$test (unsigned)"
-re " = -1 L'\\\\xffffffff'\r\n$gdb_prompt $" {
pass "$test (signed)"
-re " = -1 L'\\\\xffff'\r\n$gdb_prompt $" {
pass "$test (signed)"
# Check sizeof. These are fixed-width.
gdb_test "p sizeof($char16_exp)" "= 2" \
"sizeof($char16_exp) == 2"
gdb_test "p sizeof($char32_exp)" "= 4" \
"sizeof(char16_t) == 4"
# Size of wchar_t depends on ABI.
gdb_test "p sizeof($wchar_exp)" "= (2|4)" \
# Test printing wide literal strings. Note that when testing with
# no program started, this relies on GDB's awareness of the
# built-in wide char types.
gdb_test {p U"hello"} {= U"hello"}
gdb_test {p u"hello"} {= u"hello"}
gdb_test {p L"hello"} {= L"hello"}
# Make sure that the char16_t/char32_t/wchar_t types are recognized as
# distinct built-in types in C++ mode, even with no program loaded.
# Check that in C mode, the types are not recognized.
proc wide_char_types_no_program {} {
global srcfile testfile
# These types are not built-in in C.
with_test_prefix "c" {
gdb_test "set language c"
gdb_test "p (char16_t) -1" "No symbol table is loaded.*" \
"char16_t is not built-in"
gdb_test "p (char32_t) -1" "No symbol table is loaded.*" \
"char32_t is not built-in"
gdb_test "p (wchar_t) -1" "No symbol table is loaded.*" \
"wchar_t is not built-in"
gdb_test {p U"hello"} "No type named char32_t\\\."
gdb_test {p u"hello"} "No type named char16_t\\\."
gdb_test {p L"hello"} "No type named wchar_t\\\."
# Note GDB does not distinguish C++ dialects, so the fixed-width
# types are always available in C++ mode, even if they were not
# built-in types before C++11.
with_test_prefix "c++" {
gdb_test "set language c++"
do_test_wide_char "c++11" "(char16_t) -1" "(char32_t) -1" "(wchar_t) -1"
# Check wide char types with no program loaded.
with_test_prefix "no program" {
# Check types when a program is loaded.
with_test_prefix "with program" {
foreach_with_prefix lang {"c" "c++03" "c++11"} {
wide_char_types_program $lang