GameScriptingMastery

使用C#实现 <GameScriptingMastery>(游戏脚本高级编程) 书中的XtremeScript Assembler

Instruction

• Mov
• Add, Sub, Mul, Div
• Jmp, JE, JNE, JG, JL, JGE, JLE
• Call, Ret

XtremeScript Assembly Language Grammar

Declare local variable

var Sum

Define script entry function

func main {

	var Num
	Mov Num, 1
	
LoopBody:            # Implement a loop

	Add Num, 1
	JL  Num, 3, LoopBody

}

Define a function

func MyFunction {
	param X          # Declare some parameters
	param Y
	
	var Sum
	
	Mov Sum,      X
	Add Sum,      Y
	Mov _ret_val, Sum   # Save the result to the stack's registers
}

Call a function

func Function_1 {

}

func main {
    Call Function_1
}

Usage

Code for execute 'xasm' script:

var parser = new XASMParser ( File.ReadAllText ( "main.xasm" ) );
			
var vm = new XVM ();
vm.script = parser.Compile ();
vm.Run ();

Note

• Jump Label can only be defined in function
• Defining functions within functions is not supported
• English is not my native language, please understand