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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++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/KString.h>
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extern bool g_in_early_boot;
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namespace Kernel {
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OwnPtr<KString> KString::try_create(StringView const& string)
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{
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char* characters = nullptr;
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size_t length = string.length();
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auto new_string = KString::try_create_uninitialized(length, characters);
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if (!new_string)
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return {};
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if (!string.is_empty())
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__builtin_memcpy(characters, string.characters_without_null_termination(), length);
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characters[length] = '\0';
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return new_string;
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}
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NonnullOwnPtr<KString> KString::must_create(StringView const& string)
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{
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// We can only enforce success during early boot.
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VERIFY(g_in_early_boot);
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auto kstring = KString::try_create(string);
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VERIFY(kstring != nullptr);
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return kstring.release_nonnull();
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}
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OwnPtr<KString> KString::try_create_uninitialized(size_t length, char*& characters)
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{
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size_t allocation_size = sizeof(KString) + (sizeof(char) * length) + sizeof(char);
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auto* slot = kmalloc(allocation_size);
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if (!slot)
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return {};
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auto* new_string = new (slot) KString(length);
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characters = new_string->m_characters;
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return adopt_own_if_nonnull(new_string);
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}
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NonnullOwnPtr<KString> KString::must_create_uninitialized(size_t length, char*& characters)
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{
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// We can only enforce success during early boot.
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VERIFY(g_in_early_boot);
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auto kstring = KString::try_create_uninitialized(length, characters);
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VERIFY(kstring != nullptr);
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return kstring.release_nonnull();
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}
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OwnPtr<KString> KString::try_clone() const
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{
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return try_create(view());
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}
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void KString::operator delete(void* string)
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{
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if (!string)
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return;
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size_t allocation_size = sizeof(KString) + (sizeof(char) * static_cast<KString*>(string)->m_length) + sizeof(char);
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kfree_sized(string, allocation_size);
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}
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}
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