V3rmillion Luau Remote To Script

Lua C Parser in SendLuaCScript Documentation specific to the Lua C parser as used in the SendLuaCScript function. This is an opinionated design specific to the WRD API. It is used to interact with the wrapped Lua C API. Learn more about Lua C here. Roblox Lua Lua C Script (auto rob JailBreak) Close. Posted by 1 year ago. Roblox Lua Lua C Script (auto rob JailBreak). V3rmillion Roblox uses this exploit to insert some malicious codes into the game. Lua bytecode may not have the same design as Lua and helps stack and other items to be exploited in standard Lua programming by unconventional methods. Lua assembly code can be manually written and compiled into the Lua bytecode, but it can be difficult.

Gui to Lua Converter (Revamped)

Updated!NOTE: you may not be able to convert large UIs or UIs with large scripts because of string limits for your pc.- new ui- converts both module scripts & scripts along with ui- support for folders and new ui elements

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Oct. 14, 2020

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We're working on a new Lua VM for Roblox and also introducing optional type checking to Lua (based on a combination of type inferenceand type annotations - the latter require extensions to the syntax). This page summarizes the questions often asked.

We obviously know about LuaJIT; it's a fantastic project, and really what inspired us to go down this route - it provided an existenceproof that Lua can be much faster. Our primary performance target is a wide set of platforms, many of which (iOS, Xbox) don't allow JITper se - but LuaJIT has a very fast interpreter. So - use it, we're done? Well..

LuaJIT is a large, almost complete rewrite of Lua VM. Over the years we had a set of changes aimed at improving sandboxing in the VM -isolating individual scripts from each other, making sure scripts can't interact with the 'outside' world in uncontrolled ways, etc.These changes would need to be retargeted to an unfamiliar codebase; additionally we'd have to do a large study of safety in the VM. Beinga complete rewrite means that it's also very dangerous for us to deploy it - we like to take small, measured steps towards future goals.

LuaJIT is, unfortunately, not really maintained anymore. If we were to go down that route, we'd effectively have to own this codebase end to end -which is fine, but this means we don't get assumed advantages ('you can benefit from the work others are doing'), we only get to benefitfrom the existing work.

LuaJIT interpreters are written in somewhat custom assembly per architecture, with many compile time branches in the code; changing thiscode is much harder than changing your average C code - and we need to be able to freely change it going forward.

LuaJIT uses NaN tagging for object storage. This is the straw that broke the camel's back. NaN tagging is problematic for us for tworeasons: it prevents us from introducing optimized 'native' support for float3 type to the VM, which is key to performance in some codeour users want to run fast, and it runs into issues on 64-bit platforms, specifically some AArch64 variants - so it's somewhatdangerous going forward.

The performance of calling Roblox APIs is important to us; we can't use FFI provided by LuaJIT because of the semi-dynamic structure ofour APIs, and we have some extensions to the VM to accelerate calls to our APIs that are hard to backport.

Really, it boils down to this - if we started with LuaJIT as a baseline 10 years ago, we'd get to solve all of these issues over time,find interesting and exciting ways to extend LuaJIT to fit our needs better. But we started with Lua, and ended up in a place where it'sbetter for us to continue along this path.

Currently our actual goal is to be 'much faster' than our current version of Lua on a set of benchmarks that include ones that are'contained' within the VM, and ones that interact heavily with Roblox APIs. The satellite goal is to get close to LuaJIT interpreteron benchmarks that are contained within the VM; the hope is that with that, and with other Roblox-specific performance improvementswe're going to be better off compared to a theoretical future where we integrated LuaJIT.

Our focus right now is on a very fast interpreter due to aforementioned constraints. It's possible that we'll implement a JIT in thefuture; however, if we do go there, we'll probably want something similar to 'baseline JIT' from the JavaScript world - not a tracingone. This means we won't be able to get to LuaJIT performance level on 'number crunching' code, but we may be able to get an extraboost compared to the fast interpreter. The benefit is that the performance will be predictable without NYI or other sources of trace aborts, and it will be a much simpler implementation which means it's going to be easier to make sure it's secure.

One other exciting possibility is to leverage type information. By the time we're fully done with the interpreter we're expecting to havesolid support for types - at which point we can figure out the soundness boundaries in the system and invest into optimizations thatremove type checks from internals of type-safe code and leave them at the boundaries. Together with JIT this can be pretty powerful,especially given that these type checks can be 'strong' in that instead of deoptimizing when hitting a type mismatch we can abort theexecution which makes for a leaner code and less restrictions on the JIT compiler.

Of course this is an unexplored area so we may also fail to extract performance this way. Time will tell! Samsung sm j327p frp bypass.

We don't know! There are a couple of barriers to open-sourcing this work - for example, writing a decompiler is trivial if you have theconstantly up to date source of the compiler and full bytecode structure and documentation; our developer community will benefit from someperiod of time where we can fight exploiters who implement decompilers to analyze client-side scripts that developers are writing.

This is not off the table - but no immediate plans either. Again, time will tell.

We currently are using vanilla 5.1 GC with a fast small block allocator. LuaJIT 3.0 never-officially-released GC design looks interesting,we'll likely experiment in this area once we're done with the interpreter itself.

We're also planning to look at reducing GC pressure in other ways - the aforementioned float3 native support will help a lot since it'sthe source of a lot of generated garbage right now, we're planning to eliminate closure allocations in some cases (which has complexsemantics wrt getfenv but we're willing to risk some breakage if the performance gains are there), potentially reworking upvaluehandling to be more allocation friendly, and may or may not investigate escape analysis / etc. once we have inlining fully working.

Nope! It's mostly portable C. This was a big concern when we started this work - there's a famous post by Mike Pall (http://lua-users.org/lists/lua-l/2011-02/msg00742.html)where he talks about the challenges with C when writing fast interpreters - single branch source from switch(), complex CFG makes registerallocation hard, there aren't enough x86 registers for C compiler to fit the VM state, etc.

We were very happy to discover, that on 3 out of 4 architectures we care about (x64, ARM, AArch64), clang does an admirable job if yourcode is written carefully and uses some features to guide the code generation like __builtin_expect. We have minimum or no registerspilling, very few cases where the codegen isn't what we expect, and pretty good levels of performance overall. We can push this a bitfurther if we rewrite this in assembly - we have the benefit of always having a portable C fallback that we can use if we have any issuesand we don't have to write the assembly intepreter for every architecture we care about! - but we expected devastating codegen and it'sactually fine. There was apparently a lot of progress in the past 8 years or so since that post was written!

V3rmillion Lua C