package;
import js.Lib;
import vm.Assembler;
import vm.Machine;

class Main
{


/**
 * Microcontroller spec:
 * 512 "bytes" of memory (16 bit ints)
 * 442 : cycle counter
 * 443 : accumulator
 * 444 : register X
 * 445 : register Y
 * 446 : program counter
 * 447 : stack pointer
 * 448-512 : stack (64 bytes)
 *
 * Read/Write pins by memory address(es) (hardware specific)
 * Interrupt handlers are bound by labelled instructions prefixed with IRQ (hardware specific)
 */

/**
 * Syntax:
 * 	INSTRUCTION ARG0 ... ARGN
 * 	;Comment
 * 	alias word value
 *  label:
 *  int values only
 * 	int value prefix with # is a memory address
 * 	int value prefix with @ is a relative program counter offset
 * 	A, X and Y reference registers
 * 	A is accumulator, used for results
 */

	static function main()
	{
    //Test program printing 5 ones, 10 2s, one -1, and handling one interrupt
		var src = "
start:
	LDA 0
	LDX 5
	LDY iteration1
	JSR whileloop
	LDA 0
	LDX 10
	LDY iteration2
	JSR whileloop
	JMP end
whileloop:
	ADD 1
	BGT A X @3
	JSR Y
	JMP @-3
	TAX
	RTS
iteration1:
	TRC 1
	RTS
iteration2:
	TRC 2
	RTS
end:
	TRC -1
	BRK
IRQ0:
  TRC Interrupt
  RTI
		";

		var a = new Machine("Alpha");
    a.load(Assembler.assemble(src));
    while (a.isRunning()){
      if (a.cycleCount == 8)
        a.interrupt(0);
      a.next();
    }
	}
}