mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 21:12:43 +00:00
b847541ee8
The C++ standard says that it's legal to call the `delete` operator with a null pointer argument, in which case it should be a no-op. I encountered this issue when running a kernel that's compiled with Clang. I assume this fact was used for some kind of optimization.
68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/KString.h>
|
|
|
|
extern bool g_in_early_boot;
|
|
|
|
namespace Kernel {
|
|
|
|
OwnPtr<KString> KString::try_create(StringView const& string)
|
|
{
|
|
char* characters = nullptr;
|
|
size_t length = string.length();
|
|
auto new_string = KString::try_create_uninitialized(length, characters);
|
|
if (!new_string)
|
|
return {};
|
|
if (!string.is_empty())
|
|
__builtin_memcpy(characters, string.characters_without_null_termination(), length);
|
|
characters[length] = '\0';
|
|
return new_string;
|
|
}
|
|
|
|
NonnullOwnPtr<KString> KString::must_create(StringView const& string)
|
|
{
|
|
// We can only enforce success during early boot.
|
|
VERIFY(g_in_early_boot);
|
|
auto kstring = KString::try_create(string);
|
|
VERIFY(kstring != nullptr);
|
|
return kstring.release_nonnull();
|
|
}
|
|
|
|
OwnPtr<KString> KString::try_create_uninitialized(size_t length, char*& characters)
|
|
{
|
|
size_t allocation_size = sizeof(KString) + (sizeof(char) * length) + sizeof(char);
|
|
auto* slot = kmalloc(allocation_size);
|
|
if (!slot)
|
|
return {};
|
|
auto* new_string = new (slot) KString(length);
|
|
characters = new_string->m_characters;
|
|
return adopt_own_if_nonnull(new_string);
|
|
}
|
|
|
|
NonnullOwnPtr<KString> KString::must_create_uninitialized(size_t length, char*& characters)
|
|
{
|
|
// We can only enforce success during early boot.
|
|
VERIFY(g_in_early_boot);
|
|
auto kstring = KString::try_create_uninitialized(length, characters);
|
|
VERIFY(kstring != nullptr);
|
|
return kstring.release_nonnull();
|
|
}
|
|
|
|
OwnPtr<KString> KString::try_clone() const
|
|
{
|
|
return try_create(view());
|
|
}
|
|
|
|
void KString::operator delete(void* string)
|
|
{
|
|
if (!string)
|
|
return;
|
|
size_t allocation_size = sizeof(KString) + (sizeof(char) * static_cast<KString*>(string)->m_length) + sizeof(char);
|
|
kfree_sized(string, allocation_size);
|
|
}
|
|
|
|
}
|