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/* This testcase is part of GDB, the GNU debugger.
Copyright 2019-2023 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/>. */
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cassert>
/* A simple structure with a single integer field. Should be returned in
a register. */
struct SimpleBase
{
SimpleBase (int32_t x) : x (x) {}
int32_t x;
};
/* A simple structure derived from the simple base. Should be returned in
a register. */
struct SimpleDerived : public SimpleBase
{
SimpleDerived (int32_t x) : SimpleBase (x) {}
};
/* A structure derived from the simple base with a non-trivial destructor.
Should be returned on the stack. */
struct NonTrivialDestructorDerived : public SimpleBase
{
NonTrivialDestructorDerived (int32_t x) : SimpleBase (x) {}
~NonTrivialDestructorDerived() { x = 1; }
};
/* A structure with unaligned fields. Should be returned on the stack. */
struct UnalignedFields
{
UnalignedFields (int32_t x, double y) : x (x), y (y) {}
int32_t x;
double y;
} __attribute__((packed));
/* A structure with unaligned fields in its base class. Should be
returned on the stack. */
struct UnalignedFieldsInBase : public UnalignedFields
{
UnalignedFieldsInBase (int32_t x, double y, int32_t x2)
: UnalignedFields (x, y), x2 (x2) {}
int32_t x2;
};
struct Bitfields
{
Bitfields(unsigned int x, unsigned int y)
: fld(x), fld2(y)
{}
unsigned fld : 7;
unsigned fld2 : 7;
};
class Foo
{
public:
SimpleBase
return_simple_base (int32_t x)
{
assert (this->tag == EXPECTED_TAG);
return SimpleBase (x);
}
SimpleDerived
return_simple_derived (int32_t x)
{
assert (this->tag == EXPECTED_TAG);
return SimpleDerived (x);
}
NonTrivialDestructorDerived
return_non_trivial_destructor (int32_t x)
{
assert (this->tag == EXPECTED_TAG);
return NonTrivialDestructorDerived (x);
}
UnalignedFields
return_unaligned (int32_t x, double y)
{
assert (this->tag == EXPECTED_TAG);
return UnalignedFields (x, y);
}
UnalignedFieldsInBase
return_unaligned_in_base (int32_t x, double y, int32_t x2)
{
assert (this->tag == EXPECTED_TAG);
return UnalignedFieldsInBase (x, y, x2);
}
Bitfields
return_bitfields (unsigned int x, unsigned int y)
{
assert (this->tag == EXPECTED_TAG);
return Bitfields(x, y);
}
private:
/* Use a tag to detect if the "this" value is correct. */
static const int EXPECTED_TAG = 0xF00F00F0;
int tag = EXPECTED_TAG;
};
int
main (int argc, char *argv[])
{
Foo foo;
foo.return_simple_base(1);
foo.return_simple_derived(2);
foo.return_non_trivial_destructor(3);
foo.return_unaligned(4, 5);
foo.return_unaligned_in_base(6, 7, 8);
foo.return_bitfields(23, 74);
return 0; // break-here
}
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