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kern: devirtualize KAutoObject::DynamicCast<>()

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This is an optimization that saves the most common type of virtual call in the kernel (DynamicCast)
by storing class token as a member, rather than getting it via virtual call every time.

This does not currently cost any memory space on 64-bit targets, due to pre-existing padding space.

This optimization can be turned off via a compile-time flag for accuracy.
This commit is contained in:
Michael Scire 2021-10-16 16:24:06 -07:00
parent 26c02e2019
commit bfffe6b119
3 changed files with 40 additions and 4 deletions
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7
libraries/libmesosphere/include/mesosphere/kern_build_config.hpp
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@ -32,3 +32,10 @@
//#define MESOSPHERE_BUILD_FOR_TRACING
#define MESOSPHERE_ENABLE_PANIC_REGISTER_DUMP
#define MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP
/* 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