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kern: Nintendo now also devirtualizes KAutoObject::DynamicCast

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This commit is contained in:
Michael Scire 2025-11-11 10:54:32 -07:00 committed by SciresM
parent e36051359c
commit 418fde40a8
2 changed files with 3 additions and 25 deletions
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7
libraries/libmesosphere/include/mesosphere/kern_build_config.hpp
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@ -47,13 +47,6 @@
/* re-enabled by toggling this define. */
//#define MESOSPHERE_ENABLE_PROCESS_CREATION_TIME
/* NOTE: This enables fast class token storage using a class member. */
/* This saves a virtual call when doing KAutoObject->DynCast<>(), */
/* at the cost of storing class tokens inside the class object. */
/* However, as of (10/16/2021) KAutoObject has an unused class member */
/* of the right side, and so this does not actually cost any space. */
#define MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST
/* NOTE: This enables usage of KDebug handles as parameter for svc::GetInfo */
/* calls which require a process parameter. This enables a debugger to obtain */
/* address space/layout information, for example. However, it changes abi, and so */

21
libraries/libmesosphere/include/mesosphere/kern_k_auto_object.hpp
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@ -121,14 +121,9 @@ namespace ams::kern {
private:
KAutoObject *m_next_closed_object;
ReferenceCount m_ref_count;
#if defined(MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST)
ClassTokenType m_class_token;
#endif
public:
constexpr ALWAYS_INLINE explicit KAutoObject(util::ConstantInitializeTag) : m_next_closed_object(nullptr), m_ref_count(0)
#if defined(MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST)
, m_class_token(0)
#endif
constexpr ALWAYS_INLINE explicit KAutoObject(util::ConstantInitializeTag) : m_next_closed_object(nullptr), m_ref_count(0), m_class_token(0)
{
MESOSPHERE_ASSERT_THIS();
}
@ -151,19 +146,11 @@ namespace ams::kern {
}
ALWAYS_INLINE bool IsDerivedFrom(const TypeObj &rhs) const {
#if defined(MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST)
return TypeObj::IsClassTokenDerivedFrom(m_class_token, rhs.GetClassToken());
#else
return this->GetTypeObj().IsDerivedFrom(rhs);
#endif
return TypeObj::IsClassTokenDerivedFrom(m_class_token, rhs.GetClassToken());
}
ALWAYS_INLINE bool IsDerivedFrom(const KAutoObject &rhs) const {
#if defined(MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST)
return TypeObj::IsClassTokenDerivedFrom(m_class_token, rhs.m_class_token);
#else
return this->IsDerivedFrom(rhs.GetTypeObj());
#endif
return TypeObj::IsClassTokenDerivedFrom(m_class_token, rhs.m_class_token);
}
template<typename Derived>
@ -218,12 +205,10 @@ namespace ams::kern {
KAutoObject &auto_object = *static_cast<KAutoObject *>(obj);
/* If we should, set our class token. */
#if defined(MESOSPHERE_ENABLE_DEVIRTUALIZED_DYNAMIC_CAST)
{
constexpr auto Token = Derived::GetStaticTypeObj().GetClassToken();
auto_object.m_class_token = Token;
}
#endif
/* Initialize reference count to 1. */
auto_object.m_ref_count = 1;