VeryUnsafe 1.0.1

VeryUnsafe

This library contains a collection of various dangerous operations. Using unsafe may be less than necessary in some cases, mind your steps.

Disclaimer

Carefully read the documentation's remarks, for the operations are really unsafe in nature.

Features

• GetObjectHandleAddress, to get the address of the type handle of an object
• ChangeType, to change the type handle of an object at runtime, without requiring reallocation

Usages

• Pro-/demote objects at runtime
• Mimic another type (may or may not be heavily inspired by Seb-stian/GetVoid)
• Corrupt the managed heap in one more way

Benchmarks

It's fast. Hella fast.

push      rax
mov       rax,[rcx+10]
mov       [rsp],rax
mov       rdx,[rsp]
mov       rcx,offset MT_VeryUnsafe.Benchmarks.ObjectPromotion+RecordB
mov       [rdx],rcx
add       rsp,8
ret

And, well, here are the results of a reference benchmark:

ObjectPromotion.PromoteUnsafe: Default → The method duration is indistinguishable from the empty method duration

To use or not to use

It's unsafe af. E. g. GC can move instances after we got the address but before we write to it. Or JIT doing some dirt that we broke the whole thing.

Some constructive feedback

Don't use it. (c) WhiteBlackGoose

I hate it (c) WhiteBlackGoose

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what I don't understand is why go further to try and make it "safer" because that can't happen (c) Tanner Gooding

there is no appeal, you can't make it safer (c) Tanner Gooding

its a runtime corrupting feature, so it can't be safe (c) Tanner Gooding

there is no "safer" (c) Tanner Gooding

that won't make this safer, you are still risking JIT corruption by lying about the type (c) Tanner Gooding

there is no real difference between "shoot yourself in the bare foot" and "shoot yourself in the foot with a sock on" (c) Tanner Gooding

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lgtm, can't wait to use it (c) Sebastian

Honestly I prefer my unsafe code safe<br> But I also love micro-optimizations, so it's hard for me to decide whether I absolutely love it or despise it (c) Sebastian

Stay safe!