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# Copyright 2018-2022 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
# This tests that C++ alignof works in gdb, and that it agrees with
# the compiler.
if {[skip_cplus_tests]} { continue }
# The types we're going to test.
set typelist {
char {unsigned char}
short {unsigned short}
int {unsigned int}
long {unsigned long}
{long long} {unsigned long long}
float
double {long double}
empty
bigenum
vstruct
bfstruct
arrstruct
derived
derived2
}
if {[has_int128_cxx]} {
# Note we don't check "unsigned __int128" yet because at least gcc
# canonicalizes the name to "__int128 unsigned", and there isn't a
# c-exp.y production for this.
# https://sourceware.org/bugzilla/show_bug.cgi?id=20991
lappend typelist __int128
}
# Create the test file.
set filename [standard_output_file align.cc]
set outfile [open $filename w]
# Prologue.
puts $outfile {
template<typename T, typename U>
struct align_pair
{
T one;
U two;
};
template<typename T, typename U>
struct align_union
{
T one;
U two;
};
enum bigenum { VALUE = 0xffffffffull };
struct empty { };
struct vstruct { virtual ~vstruct() {} char c; };
struct bfstruct { unsigned b : 3; };
struct arrstruct { short fld[7]; };
unsigned a_int3 = alignof (int[3]);
#if !defined (__clang__)
unsigned a_void = alignof (void);
#endif
struct base { char c; };
struct derived : public virtual base { int i; };
struct b2 : public virtual base { char d; };
struct derived2 : public b2, derived { char e; };
}
# First emit single items.
foreach type $typelist {
set utype [join [split $type] _]
puts $outfile "$type item_$utype;"
puts $outfile "unsigned a_$utype\n = alignof ($type);"
puts $outfile "typedef $type t_$utype;"
puts $outfile "t_$utype item_t_$utype;"
}
# Now emit all pairs.
foreach type $typelist {
set utype [join [split $type] _]
foreach inner $typelist {
set uinner [join [split $inner] _]
puts $outfile "align_pair<$type, $inner> item_${utype}_x_${uinner};"
puts $outfile "unsigned a_${utype}_x_${uinner}"
puts $outfile " = alignof (align_pair<$type, $inner>);"
puts $outfile "align_union<$type, $inner> item_${utype}_u_${uinner};"
puts $outfile "unsigned a_${utype}_u_${uinner}"
puts $outfile " = alignof (align_union<$type, $inner>);"
}
}
# Epilogue.
puts $outfile {
int main() {
return 0;
}
}
close $outfile
standard_testfile $filename
if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
{debug nowarnings c++ additional_flags=-std=c++11}]} {
return -1
}
if {![runto_main]} {
perror "test suppressed"
return
}
proc maybe_xfail {type} {
# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560
# The g++ implementation of alignof is changing to match C11.
if {[is_x86_like_target]
&& [test_compiler_info {gcc-[0-8]-*}]
&& ($type == "double" || $type == "long long"
|| $type == "unsigned long long")} {
setup_xfail *-*-*
}
}
foreach type $typelist {
set utype [join [split $type] _]
set expected [get_integer_valueof a_$utype 0]
maybe_xfail $type
gdb_test "print alignof($type)" " = $expected"
maybe_xfail $type
gdb_test "print alignof(t_$utype)" " = $expected"
maybe_xfail $type
gdb_test "print alignof(typeof(item_$utype))" " = $expected"
foreach inner $typelist {
set uinner [join [split $inner] _]
set expected [get_integer_valueof a_${utype}_x_${uinner} 0]
gdb_test "print alignof(align_pair<${type},${inner}>)" " = $expected"
set expected [get_integer_valueof a_${utype}_u_${uinner} 0]
gdb_test "print alignof(align_union<${type},${inner}>)" " = $expected"
}
}
set expected [get_integer_valueof a_int3 0]
gdb_test "print alignof(int\[3\])" " = $expected"
# As an extension, GCC allows void pointer arithmetic, with
# sizeof(void) and alignof(void) both 1. This test checks
# GDB's support of GCC's extension.
if [test_compiler_info clang*] {
# Clang doesn't support GCC's extension.
set expected 1
} else {
set expected [get_integer_valueof a_void 0]
}
gdb_test "print alignof(void)" " = $expected"
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