gdb/testsuite/gdb.cp/align.exp

# Copyright 2018-2021 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
# 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"