xref: /xnu-11215/tests/intrusive_shared_ptr_src/abi.size_alignment.cpp (revision 8d741a5d)

//
// This tests that the alignment and size of a class are the same whether
// they have a `T*` or a shared pointer data member.
//

#include <libkern/c++/intrusive_shared_ptr.h>
#include "test_policy.h"
#include <cstddef>
#include <darwintest.h>


namespace ns1 {
struct FooShared {
	test_shared_ptr<int> ptr;
};

struct FooRaw {
	int* ptr;
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

namespace ns2 {
struct FooShared {
	int i;
	test_shared_ptr<int> ptr;
};

struct FooRaw {
	int i;
	int* ptr;
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

namespace ns3 {
struct FooShared {
	char c;
	test_shared_ptr<int> ptr;
	int i;
};

struct FooRaw {
	char c;
	int* ptr;
	int i;
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

namespace ns4 {
struct FooShared {
	char c;
	unsigned int b : 5;
	test_shared_ptr<int> ptr;
	int i;
};

struct FooRaw {
	char c;
	unsigned int b : 5;
	int* ptr;
	int i;
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

namespace ns5 {
struct __attribute__((packed)) FooShared {
	char c;
	unsigned int b : 5;
	test_shared_ptr<int> ptr;
	int i;
};

struct __attribute__((packed)) FooRaw {
	char c;
	unsigned int b : 5;
	int* ptr;
	int i;
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

namespace ns6 {
struct FooShared {
	char c;
	unsigned int b : 5;
	test_shared_ptr<int> ptr;
	int i __attribute__((packed));
};

struct FooRaw {
	char c;
	unsigned int b : 5;
	int* ptr;
	int i __attribute__((packed));
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

namespace ns7 {
struct FooShared {
	char c;
	unsigned int b : 5;
	test_shared_ptr<int> ptr __attribute__((packed));
	int i;
};

struct FooRaw {
	char c;
	unsigned int b : 5;
	int* ptr __attribute__((packed));
	int i;
};

static_assert(sizeof(FooShared) == sizeof(FooRaw));
static_assert(alignof(FooShared) == alignof(FooRaw));
static_assert(offsetof(FooShared, ptr) == offsetof(FooRaw, ptr));
}

T_DECL(abi_size_alignment, "intrusive_shared_ptr.abi.size_alignment", T_META_TAG_VM_PREFERRED) {
	T_PASS("intrusive_shared_ptr.abi.size_alignment compile-time tests passed");
}