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Kernel: Fix KResultOr move semantics

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We need to track whether we actually own the storage.
This commit is contained in:
Tom 2020-09-18 16:13:41 -06:00 committed by Andreas Kling
parent 4c2f86c24f
commit 03f45febe2
Notes: sideshowbarker 2024-07-19 02:20:49 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/03f45febe20
Pull-request: https://github.com/SerenityOS/serenity/pull/3546
1 changed files with 21 additions and 6 deletions
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27
Kernel/KResult.h
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@ -72,12 +72,14 @@ public:
ALWAYS_INLINE KResultOr(T&& value)
{
new (&m_storage) T(move(value));
m_have_storage = true;
}
template<typename U>
ALWAYS_INLINE KResultOr(U&& value)
{
new (&m_storage) T(move(value));
m_have_storage = true;
}
KResultOr(KResultOr&& other)
@ -86,8 +88,12 @@ public:
if (m_is_error)
m_error = other.m_error;
else {
new (&m_storage) T(move(other.value()));
other.value().~T();
if (other.m_have_storage) {
new (&m_storage) T(move(other.value()));
m_have_storage = true;
other.value().~T();
other.m_have_storage = false;
}
}
other.m_is_error = true;
other.m_error = KSuccess;
@ -95,14 +101,20 @@ public:
KResultOr& operator=(KResultOr&& other)
{
if (!m_is_error)
if (!m_is_error && m_have_storage) {
value().~T();
m_have_storage = false;
}
m_is_error = other.m_is_error;
if (m_is_error)
m_error = other.m_error;
else {
new (&m_storage) T(move(other.value()));
other.value().~T();
if (other.m_have_storage) {
new (&m_storage) T(move(other.value()));
m_have_storage = true;
other.value().~T();
other.m_have_storage = false;
}
}
other.m_is_error = true;
other.m_error = KSuccess;
@ -111,7 +123,7 @@ public:
~KResultOr()
{
if (!m_is_error)
if (!m_is_error && m_have_storage)
value().~T();
}
@ -140,8 +152,10 @@ public:
ALWAYS_INLINE T release_value()
{
ASSERT(!m_is_error);
ASSERT(m_have_storage);
T released_value = *reinterpret_cast<T*>(&m_storage);
value().~T();
m_have_storage = false;
return released_value;
}
@ -149,6 +163,7 @@ private:
alignas(T) char m_storage[sizeof(T)];
KResult m_error;
bool m_is_error { false };
bool m_have_storage { false };
};
}