.dmJIT

.dmJIT is a Rust-based JIT compiler using modified auxtools, dmasm and Inkwell LLVM wrapper for boosting Byond DM performance without any hassle (such as rewriting/refactoring your DM code).

Implementation status

Roadmap

• PoC ✔️
• Deoptimization ✔️
• Sleeping proc deoptimization
• Calls ✔️
• Virtual calls ✔️
• Type probing deoptimization
• Heterogenous instruction optimization
• JITed-to-JITed direct calls
• Tiering
• Branch / Call counting
• Sleeping proc support

Opcodes

Dependencies

These instructions were taken directly from tgstation's rust-g documentation.

The Rust compiler:

1. Install the Rust compiler's dependencies (primarily the system linker):

   • Ubuntu: sudo apt-get install gcc-multilib
   • Windows (MSVC): Build Tools for Visual Studio 2017
   • Windows (GNU): No action required

2. Use the Rust installer, or another Rust installation method, or run the following:

   curl https://sh.rustup.rs -sSfo rustup-init.sh
   chmod +x rustup-init.sh
   # Nightly toolchain is required
   ./rustup-init.sh

   Alternatively without saving

   # Nightly toolchain is required
   curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly

3. Set the default compiler to 32-bit:

   # Clone the `dm-jitaux` repository to a directory of your choice
   git clone https://github.com/ss220-space/dm-jitaux.git
   # in the `dm-jitaux` directory...
   cd dm-jitaux
   # Linux
   rustup target add i686-unknown-linux-gnu
   # Windows
   rustup target add i686-pc-windows-msvc
   
   # Clone the `auxtools` repository to a parent directory of dm-jitaux
   cd ..
   git clone https://github.com/ss220-space/auxtools.git --branch dm-jitaux
   # in the `auxtools` directory...
   cd auxtools
   # Linux
   rustup target add i686-unknown-linux-gnu
   # Windows
   rustup target add i686-pc-windows-msvc

System libraries:

• Ubuntu and Debian users run:

  sudo dpkg --add-architecture i386
  sudo apt-get update
  sudo apt-get install zlib1g-dev:i386 libssl-dev:i386 pkg-config:i386
  sudo apt-get install gcc-multilib g++-multilib

• Other Linux distributions install the appropriate 32-bit development and 32-bit runtime packages.

Building

LLVM

Windows

CMake required, can be downloaded from cmake.org

You need to build LLVM 12.0.0 on Windows with x32 target and MD CRT linking

Note: It takes 30-60 minutes to compile, 23 GB of free disk space

Download from LLVM github releases

# Unpack to path without spaces 
tar -xJf llvm-12.0.0.src.tar.xz
# Create build directory
mkdir build
cd build
# Configure 
cmake -DCMAKE_INSTALL_PREFIX=C:/LLVM -DLLVM_USE_CRT_DEBUG=MD -DLLVM_TARGETS_TO_BUILD="X86" -Thost=x86 -A Win32 ../llvm-12.0.0.src/
# Build
cmake --build .
# Install to CMAKE_INSTALL_PREFIX
cmake --build . --target install

Full guide: Building LLVM with CMake

Debian

sudo apt install llvm-12-dev:i386

Other

Checkout this for more info.

Compiling

Windows

# PowerShell
$env:LLVM_SYS_120_PREFIX = "C:\LLVM" # LLVM prefix specified before
cargo build --target i686-pc-windows-msvc
cargo test --target i686-pc-windows-msvc -- --test-threads=1

Linux

cargo build --target i686-unknown-linux-gnu
BYOND_PATH="~/byond" cargo test --target i686-unknown-linux-gnu -- --test-threads=1

See also

DM Opcode relative frequency table

opcode_counts.txt

License

dm-jitaux is licensed under the AGPL-3.0 License. See LICENSE for more details.