clarkok / cript

Lua like script language

Cript

A simple and lightweight script language.

中文介绍

Language feature

• supported types
  • 30bits signed integer
  • 256byte-max-length internal string
  • hash-based Object and Array
  • value-captured Closure
  • lightweight C function
  • GC managed userdata
• dynamic types
• full support of recursion
• on-the-fly import
• call script functions from C functions and vise-versa

Virtual machine feature

• copy-and-swap GC
• register-based VM
• SSA-like IR
• able to register C functions
• zero dependency except libc

Current limitation

• only support while loop and if branch statement
• heap size is hardcoded as 1MB
• single thread
• 32bits VM

Compile

git clone https://github.com/clarkok/cript.git
cd cript
mkdir build
cd build
cmake ../
make

Run script

./path/to/cript ./path/to/script.cr

Hello world!

// save it to hello_world.cr and run it!
global.println('Hello World!');

Example scripts

See test/script_test, there is enough examples.

Current status

Trying to optimize compiler

Faster than NodeJS

Haha, just kidding.

cript's Issues

Optimization TODO List

• Common subexpression estimate
• Basic block reorder to prevent extra J inst
• Register rename to reduce frame size
• Block level dead code estimate
• Loop invariant move

Crash occurred when string_pool too large