jit是将热点代码翻译成机器码，加速程序运行

jitdemo 即时编译jit原理demo,帮助理解跨平台语言代码（java python lua等）怎么转成机器码（注意不是字节码）运行原理

Demo programs for my blog entry "Hello, JIT World!"

compile

lua ./third_party/dynasm/dynasm.lua jit2.dasc > jit2.h
lua ./third_party/dynasm/dynasm.lua jit3.dasc > jit3.h
make

run

./jit2 42;echo $?
- 输出:42
./jit3 "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."
- 输出:Hello World!