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Type safe mem_zero function (fixes #5228)

Browse source 
Partially replaces #5690.
POD types are just memset. Other types are either destructed if not
trivial and/or constructed if not trivial. Types need to have a default
constructor.
Virtual classes can be mem_zeroed only if they already have been
constructed, otherwise it is UB.
This commit is contained in:
Chairn 2023-01-03 00:35:21 +01:00 committed by heinrich5991
parent ee04cd4dda
commit 6e629e1deb
5 changed files with 444 additions and 12 deletions
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3
CMakeLists.txt
View file

@ -325,6 +325,8 @@ if(NOT MSVC AND NOT HAIKU)
add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wthread-safety)
add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wthread-safety-negative)
add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wsuggest-override)
add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wdynamic-class-memaccess) # clang
add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wclass-memaccess) # gcc
add_linker_flag_if_supported(OUR_FLAGS_LINK -Wno-alloc-size-larger-than) # save.cpp with LTO
# add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wdouble-promotion) # Many occurrences
# add_cxx_compiler_flag_if_supported(OUR_FLAGS_OWN -Wnull-dereference) # Many occurrences
@ -2750,6 +2752,7 @@ if(GTEST_FOUND OR DOWNLOAD_GTEST)
linereader.cpp
mapbugs.cpp
math.cpp
memory.cpp
name_ban.cpp
net.cpp
netaddr.cpp

5
src/base/system.cpp
View file

@ -236,11 +236,6 @@ void mem_move(void *dest, const void *source, size_t size)
memmove(dest, source, size);
}
void mem_zero(void *block, size_t size)
{
memset(block, 0, size);
}
int mem_comp(const void *a, const void *b, size_t size)
{
return memcmp(a, b, size);

52
src/base/system.h
View file

@ -171,7 +171,55 @@ void mem_move(void *dest, const void *source, size_t size);
* @param block Pointer to the block to zero out.
* @param size Size of the block.
*/
void mem_zero(void *block, size_t size);
template<typename T>
inline void mem_zero(T *block, size_t size)
{
typedef typename std::remove_all_extents<T>::type BaseT;
if constexpr(std::is_pointer<T>::value || std::is_pointer<BaseT>::value)
{
// pointer of pointer, just memset it
memset(block, 0, size);
}
else if constexpr(std::is_array<T>::value)
{ // pointer to array type
if constexpr(std::is_fundamental<BaseT>::value)
{ // array of fundamental type, just memset it
memset(block, 0, size);
}
else
{ // array of user defined type, destroying all objects and recreating new ones
const size_t N = size / sizeof(BaseT);
if constexpr(!std::is_trivially_destructible<BaseT>::value)
{ // non trivial destructor means user provided or virtual destructor, see https://en.cppreference.com/w/cpp/language/destructor#Trivial_destructor
// so we gotta call it manually
for(size_t i(0); i < N; ++i)
((BaseT *)block)[i].~BaseT();
}
if constexpr(std::is_trivially_constructible<BaseT>::value)
memset(block, 0, size); // trivial constructor implies POD
else
new(block) BaseT[N]{};
}
}
else if constexpr(std::is_fundamental<typename std::remove_pointer<T>::type>::value || std::is_same<decltype(block), void *>::value)
{ // pointer to fundamental type, just memset it
memset(block, 0, size);
}
else
{ // pointer to type T, BUT CAN BE AN ARRAY...
const size_t N = size / sizeof(T);
if constexpr(!std::is_trivially_destructible<T>::value)
{ // non trivial destructor means user provided or virtual destructor, see https://en.cppreference.com/w/cpp/language/destructor#Trivial_destructor
// so we gotta call it manually
for(size_t i(0); i < N; ++i)
block[i].~T();
}
if constexpr(std::is_trivially_constructible<T>::value)
memset(block, 0, size); // trivial constructor implies POD
else
new(block) T[N]{};
}
}
/**
* Compares two blocks of memory
@ -2830,7 +2878,7 @@ bool shell_unregister_application(const char *executable, bool *updated);
* Notifies the system that a protocol or file extension has been changed and the shell needs to be updated.
*
* @ingroup Shell
*
*
* @remark This is a potentially expensive operation, so it should only be called when necessary.
*/
void shell_update();

7
src/engine/client/client.cpp
View file

@ -4195,9 +4195,7 @@ void CClient::RegisterCommands()
static CClient *CreateClient()
{
CClient *pClient = static_cast<CClient *>(malloc(sizeof(*pClient)));
mem_zero(pClient, sizeof(CClient));
return new(pClient) CClient;
return new CClient;
}
void CClient::HandleConnectAddress(const NETADDR *pAddr)
@ -4369,8 +4367,7 @@ int main(int argc, const char **argv)
CleanerFunctions.emplace([pKernel, pClient]() {
pKernel->Shutdown();
delete pKernel;
pClient->~CClient();
free(pClient);
delete pClient;
});
const std::thread::id MainThreadId = std::this_thread::get_id();

389
src/test/memory.cpp Normal file
View file

@ -0,0 +1,389 @@
#include <gtest/gtest.h>
#include <base/system.h>
#include <random>
#include <vector>
static std::mt19937 gs_randomizer;
void mem_fill(void *block, size_t size)
{
unsigned char *bytes = (unsigned char *)block;
size_t i;
for(i = 0; i < size; i++)
{
bytes[i] = gs_randomizer();
}
}
bool mem_is_null(const void *block, size_t size)
{
const unsigned char *bytes = (const unsigned char *)block;
size_t i;
for(i = 0; i < size; i++)
{
if(bytes[i] != 0)
{
return false;
}
}
return true;
}
TEST(Memory, BaseTypes)
{
void *aVoid[123];
mem_fill(aVoid, sizeof(aVoid));
EXPECT_FALSE(mem_is_null(aVoid, sizeof(aVoid)));
mem_zero(&aVoid, sizeof(aVoid));
EXPECT_TRUE(mem_is_null(aVoid, sizeof(aVoid)));
mem_fill(aVoid, sizeof(aVoid));
EXPECT_FALSE(mem_is_null(aVoid, sizeof(aVoid)));
mem_zero(&aVoid[0], 123 * sizeof(void *));
EXPECT_TRUE(mem_is_null(aVoid, sizeof(aVoid)));
mem_fill(aVoid, sizeof(aVoid));
EXPECT_FALSE(mem_is_null(aVoid, sizeof(aVoid)));
mem_zero(aVoid, sizeof(aVoid));
EXPECT_TRUE(mem_is_null(aVoid, sizeof(aVoid)));
int aInt[512];
mem_fill(aInt, sizeof(aInt));
EXPECT_FALSE(mem_is_null(aInt, sizeof(aInt)));
mem_zero(&aInt, sizeof(aInt));
EXPECT_TRUE(mem_is_null(aInt, sizeof(aInt)));
mem_fill(aInt, sizeof(aInt));
EXPECT_FALSE(mem_is_null(aInt, sizeof(aInt)));
mem_zero(&aInt[0], sizeof(aInt));
EXPECT_TRUE(mem_is_null(aInt, sizeof(aInt)));
mem_fill(aInt, sizeof(aInt));
EXPECT_FALSE(mem_is_null(aInt, sizeof(aInt)));
mem_zero(aInt, sizeof(aInt));
EXPECT_TRUE(mem_is_null(aInt, sizeof(aInt)));
int *apInt[512];
mem_fill(apInt, sizeof(apInt));
EXPECT_FALSE(mem_is_null(apInt, sizeof(apInt)));
mem_zero(&apInt, sizeof(apInt));
EXPECT_TRUE(mem_is_null(apInt, sizeof(apInt)));
mem_fill(apInt, sizeof(apInt));
EXPECT_FALSE(mem_is_null(apInt, sizeof(apInt)));
mem_zero(apInt, sizeof(apInt));
EXPECT_TRUE(mem_is_null(apInt, sizeof(apInt)));
int aaInt[10][20];
mem_fill(aaInt, sizeof(aaInt));
EXPECT_FALSE(mem_is_null(aaInt, sizeof(aaInt)));
mem_zero(&aaInt, sizeof(aaInt));
EXPECT_TRUE(mem_is_null(aaInt, sizeof(aaInt)));
mem_fill(aaInt, sizeof(aaInt));
EXPECT_FALSE(mem_is_null(aaInt, sizeof(aaInt)));
mem_zero(&aaInt[0], sizeof(aaInt));
EXPECT_TRUE(mem_is_null(aaInt, sizeof(aaInt)));
mem_fill(aaInt, sizeof(aaInt));
EXPECT_FALSE(mem_is_null(aaInt, sizeof(aaInt)));
mem_zero(&aaInt[0][0], sizeof(aaInt));
EXPECT_TRUE(mem_is_null(aaInt, sizeof(aaInt)));
mem_fill(aaInt, sizeof(aaInt));
EXPECT_FALSE(mem_is_null(aaInt, sizeof(aaInt)));
mem_zero(aaInt, sizeof(aaInt));
EXPECT_TRUE(mem_is_null(aaInt, sizeof(aaInt)));
mem_fill(aaInt, sizeof(aaInt));
EXPECT_FALSE(mem_is_null(aaInt, sizeof(aaInt)));
mem_zero(aaInt[0], sizeof(aaInt));
EXPECT_TRUE(mem_is_null(aaInt, sizeof(aaInt)));
int *aapInt[10][20];
mem_fill(aapInt, sizeof(aapInt));
EXPECT_FALSE(mem_is_null(aapInt, sizeof(aapInt)));
mem_zero(&aapInt, sizeof(aapInt));
EXPECT_TRUE(mem_is_null(aapInt, sizeof(aapInt)));
mem_fill(aapInt, sizeof(aapInt));
EXPECT_FALSE(mem_is_null(aapInt, sizeof(aapInt)));
mem_zero(&aapInt[0], sizeof(aapInt));
EXPECT_TRUE(mem_is_null(aapInt, sizeof(aapInt)));
mem_fill(aapInt, sizeof(aapInt));
EXPECT_FALSE(mem_is_null(aapInt, sizeof(aapInt)));
mem_zero(aapInt, sizeof(aapInt));
EXPECT_TRUE(mem_is_null(aapInt, sizeof(aapInt)));
mem_fill(aapInt, sizeof(aapInt));
EXPECT_FALSE(mem_is_null(aapInt, sizeof(aapInt)));
mem_zero(aapInt[0], sizeof(aapInt));
EXPECT_TRUE(mem_is_null(aapInt, sizeof(aapInt)));
}
TEST(Memory, PODTypes)
{
NETADDR aAddr[123];
mem_fill(aAddr, sizeof(aAddr));
EXPECT_FALSE(mem_is_null(aAddr, sizeof(aAddr)));
mem_zero(&aAddr, sizeof(aAddr));
EXPECT_TRUE(mem_is_null(aAddr, sizeof(aAddr)));
mem_fill(aAddr, sizeof(aAddr));
EXPECT_FALSE(mem_is_null(aAddr, sizeof(aAddr)));
mem_zero(&aAddr[0], sizeof(aAddr));
EXPECT_TRUE(mem_is_null(aAddr, sizeof(aAddr)));
mem_fill(aAddr, sizeof(aAddr));
EXPECT_FALSE(mem_is_null(aAddr, sizeof(aAddr)));
mem_zero(aAddr, sizeof(aAddr));
EXPECT_TRUE(mem_is_null(aAddr, sizeof(aAddr)));
NETADDR *apAddr[123];
mem_fill(apAddr, sizeof(apAddr));
EXPECT_FALSE(mem_is_null(apAddr, sizeof(apAddr)));
mem_zero((NETADDR **)apAddr, sizeof(apAddr));
EXPECT_TRUE(mem_is_null(apAddr, sizeof(apAddr)));
mem_fill(apAddr, sizeof(apAddr));
EXPECT_FALSE(mem_is_null(apAddr, sizeof(apAddr)));
mem_zero(&apAddr, sizeof(apAddr));
EXPECT_TRUE(mem_is_null(apAddr, sizeof(apAddr)));
mem_fill(apAddr, sizeof(apAddr));
EXPECT_FALSE(mem_is_null(apAddr, sizeof(apAddr)));
mem_zero(&apAddr[0], sizeof(apAddr));
EXPECT_TRUE(mem_is_null(apAddr, sizeof(apAddr)));
mem_fill(apAddr, sizeof(apAddr));
EXPECT_FALSE(mem_is_null(apAddr, sizeof(apAddr)));
mem_zero(apAddr, sizeof(apAddr));
EXPECT_TRUE(mem_is_null(apAddr, sizeof(apAddr)));
// 2D arrays
NETADDR aaAddr[10][20];
mem_fill(aaAddr, sizeof(aaAddr));
EXPECT_FALSE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_zero(&aaAddr, sizeof(aaAddr));
EXPECT_TRUE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_fill(aaAddr, sizeof(aaAddr));
EXPECT_FALSE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_zero(&aaAddr[0], sizeof(aaAddr));
EXPECT_TRUE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_fill(aaAddr, sizeof(aaAddr));
EXPECT_FALSE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_zero(&aaAddr[0][0], sizeof(aaAddr));
EXPECT_TRUE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_fill(aaAddr, sizeof(aaAddr));
EXPECT_FALSE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_zero(aaAddr, sizeof(aaAddr));
EXPECT_TRUE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_fill(aaAddr, sizeof(aaAddr));
EXPECT_FALSE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
mem_zero(aaAddr[0], sizeof(aaAddr));
EXPECT_TRUE(mem_is_null((NETADDR *)aaAddr, sizeof(aaAddr)));
// 2D pointer arrays
NETADDR *aapAddr[10][20];
mem_fill(aapAddr, sizeof(aapAddr));
EXPECT_FALSE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_zero(&aapAddr, sizeof(aapAddr));
EXPECT_TRUE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_fill(aapAddr, sizeof(aapAddr));
EXPECT_FALSE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_zero(&aapAddr[0], sizeof(aapAddr));
EXPECT_TRUE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_fill(aapAddr, sizeof(aapAddr));
EXPECT_FALSE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_zero(&aapAddr[0][0], sizeof(aapAddr));
EXPECT_TRUE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_fill(aapAddr, sizeof(aapAddr));
EXPECT_FALSE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_zero(aapAddr, sizeof(aapAddr));
EXPECT_TRUE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_fill(aapAddr, sizeof(aapAddr));
EXPECT_FALSE(mem_is_null(aapAddr, sizeof(aapAddr)));
mem_zero(aapAddr[0], sizeof(aapAddr));
EXPECT_TRUE(mem_is_null(aapAddr, sizeof(aapAddr)));
}
struct CDummyClass
{
int x = 1234;
int y;
};
bool mem_is_null(CDummyClass *block, size_t size)
{
const CDummyClass *data = block;
size_t i;
for(i = 0; i < size / sizeof(CDummyClass); i++)
{
if(data[i].x != 1234 || data[i].y != 0)
{
return false;
}
}
return true;
}
TEST(Memory, ConstructibleTypes)
{
CDummyClass aTest[123];
mem_fill(aTest, sizeof(aTest));
EXPECT_FALSE(mem_is_null(aTest, sizeof(aTest)));
mem_zero(&aTest, sizeof(aTest));
EXPECT_TRUE(mem_is_null(aTest, sizeof(aTest)));
mem_fill(aTest, sizeof(aTest));
EXPECT_FALSE(mem_is_null(aTest, sizeof(aTest)));
mem_zero(&aTest[0], sizeof(aTest));
EXPECT_TRUE(mem_is_null(aTest, sizeof(aTest)));
mem_fill(aTest, sizeof(aTest));
EXPECT_FALSE(mem_is_null(aTest, sizeof(aTest)));
mem_zero(aTest, sizeof(aTest));
EXPECT_TRUE(mem_is_null(aTest, sizeof(aTest)));
CDummyClass aaTest[2][2];
mem_fill(aaTest, sizeof(aaTest));
EXPECT_FALSE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_zero(&aaTest, sizeof(aaTest));
EXPECT_TRUE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_fill(aaTest, sizeof(aaTest));
EXPECT_FALSE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_zero(&aaTest[0], sizeof(aaTest));
EXPECT_TRUE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_fill(aaTest, sizeof(aaTest));
EXPECT_FALSE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_zero(&aaTest[0][0], sizeof(aaTest));
EXPECT_TRUE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_fill(aaTest, sizeof(aaTest));
EXPECT_FALSE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_zero(aaTest, sizeof(aaTest));
EXPECT_TRUE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_fill(aaTest, sizeof(aaTest));
EXPECT_FALSE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
mem_zero(aaTest[0], sizeof(aaTest));
EXPECT_TRUE(mem_is_null((CDummyClass *)aaTest, sizeof(aaTest)));
}
struct CDummyClass2
{
int x;
int y;
~CDummyClass2()
{
if(x == 684684 && y == -12345678)
dbg_break();
}
};
TEST(Memory, DestructibleTypes)
{
CDummyClass2 aTest2[123];
mem_fill(aTest2, sizeof(aTest2));
EXPECT_FALSE(mem_is_null(aTest2, sizeof(aTest2)));
mem_zero(&aTest2, sizeof(aTest2));
EXPECT_TRUE(mem_is_null(aTest2, sizeof(aTest2)));
mem_fill(aTest2, sizeof(aTest2));
EXPECT_FALSE(mem_is_null(aTest2, sizeof(aTest2)));
mem_zero(&aTest2[0], sizeof(aTest2));
EXPECT_TRUE(mem_is_null(aTest2, sizeof(aTest2)));
mem_fill(aTest2, sizeof(aTest2));
EXPECT_FALSE(mem_is_null(aTest2, sizeof(aTest2)));
mem_zero(aTest2, sizeof(aTest2));
EXPECT_TRUE(mem_is_null(aTest2, sizeof(aTest2)));
CDummyClass2 aaTest2[10][20];
mem_fill(aaTest2, sizeof(aaTest2));
EXPECT_FALSE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_zero(&aaTest2, sizeof(aaTest2));
EXPECT_TRUE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_fill(aaTest2, sizeof(aaTest2));
EXPECT_FALSE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_zero(&aaTest2[0], sizeof(aaTest2));
EXPECT_TRUE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_fill(aaTest2, sizeof(aaTest2));
EXPECT_FALSE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_zero(&aaTest2[0][0], sizeof(aaTest2));
EXPECT_TRUE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_fill(aaTest2, sizeof(aaTest2));
EXPECT_FALSE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_zero(aaTest2, sizeof(aaTest2));
EXPECT_TRUE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_fill(aaTest2, sizeof(aaTest2));
EXPECT_FALSE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
mem_zero(aaTest2[0], sizeof(aaTest2));
EXPECT_TRUE(mem_is_null((CDummyClass2 *)aaTest2, sizeof(aaTest2)));
}
struct CDummyClass3
{
int x;
int y;
std::vector<int> v;
};
void mem_fill(CDummyClass3 *block, size_t size)
{
size_t i;
for(i = 0; i < size / sizeof(CDummyClass3); i++)
{
block[i].x = gs_randomizer();
block[i].y = gs_randomizer();
block[i].v.resize(gs_randomizer() & 127, gs_randomizer());
}
}
bool mem_is_null(CDummyClass3 *block, size_t size)
{
const CDummyClass3 *data = block;
size_t i;
for(i = 0; i < size / sizeof(CDummyClass3); i++)
{
if(data[i].x != 0 || data[i].y != 0 || !data[i].v.empty())
{
return false;
}
}
return true;
}
TEST(Memory, ComplexTypes)
{
CDummyClass3 aTest3[123];
mem_fill(aTest3, sizeof(aTest3));
EXPECT_FALSE(mem_is_null(aTest3, sizeof(aTest3)));
mem_zero(&aTest3, sizeof(aTest3));
EXPECT_TRUE(mem_is_null(aTest3, sizeof(aTest3)));
mem_fill(aTest3, sizeof(aTest3));
EXPECT_FALSE(mem_is_null(aTest3, sizeof(aTest3)));
mem_zero(&aTest3[0], sizeof(aTest3));
EXPECT_TRUE(mem_is_null(aTest3, sizeof(aTest3)));
mem_fill(aTest3, sizeof(aTest3));
EXPECT_FALSE(mem_is_null(aTest3, sizeof(aTest3)));
mem_zero(aTest3, sizeof(aTest3));
EXPECT_TRUE(mem_is_null(aTest3, sizeof(aTest3)));
CDummyClass3 aaTest3[10][20];
mem_fill((CDummyClass3 *)aaTest3, sizeof(aaTest3));
EXPECT_FALSE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_zero(&aaTest3, sizeof(aaTest3));
EXPECT_TRUE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_fill((CDummyClass3 *)aaTest3, sizeof(aaTest3));
EXPECT_FALSE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_zero(&aaTest3[0], sizeof(aaTest3));
EXPECT_TRUE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_fill((CDummyClass3 *)aaTest3, sizeof(aaTest3));
EXPECT_FALSE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_zero(&aaTest3[0][0], sizeof(aaTest3));
EXPECT_TRUE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_fill((CDummyClass3 *)aaTest3, sizeof(aaTest3));
EXPECT_FALSE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_zero(aaTest3, sizeof(aaTest3));
EXPECT_TRUE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_fill((CDummyClass3 *)aaTest3, sizeof(aaTest3));
EXPECT_FALSE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
mem_zero(aaTest3[0], sizeof(aaTest3));
EXPECT_TRUE(mem_is_null((CDummyClass3 *)aaTest3, sizeof(aaTest3)));
}