513 lines
10 KiB
JavaScript
513 lines
10 KiB
JavaScript
/* Nga ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Copyright (c) 2008 - 2019, Charles Childers
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Copyright (c) 2009 - 2010, Luke Parrish
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Copyright (c) 2010, Marc Simpson
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Copyright (c) 2010, Jay Skeer
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Copyright (c) 2011, Kenneth Keating
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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var IMAGE_SIZE = 524288; /* Amount of simulated RAM */
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var DATA_DEPTH = 8192; /* Depth of data stack */
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var ADDRESS_DEPTH = 32768; /* Depth of the stacks */
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var framebuffer = 0;
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function Stack(size) {
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this.sp = 0;
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this.data = new Array(size);
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this.push = function(n) {
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this.sp++;
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this.data[this.sp] = n;
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}
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this.pop = function() {
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return this.data[this.sp--];
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}
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this.depth = function() {
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return this.sp;
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}
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this.tos = function() {
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return this.data[this.sp];
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}
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this.nos = function() {
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return this.data[this.sp - 1];
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}
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this.dup = function() {
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this.push(this.tos());
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}
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this.drop = function() {
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this.sp--;
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}
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this.swap = function() {
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var a = this.nos();
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this.data[this.sp - 1] = this.tos();
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this.data[this.sp] = a;
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}
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this.inc = function() {
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this.data[this.sp]++;
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}
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this.dec = function() {
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this.data[this.sp]--;
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}
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this.reset = function() {
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this.sp = 0;
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}
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}
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function Opcodes() {
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this.NOP = 0;
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this.LIT = 1;
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this.DUP = 2;
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this.DROP = 3;
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this.SWAP = 4;
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this.PUSH = 5;
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this.POP = 6;
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this.JUMP = 7;
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this.CALL = 8;
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this.CCALL = 9;
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this.RETURN = 10;
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this.EQ = 11;
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this.NEQ = 12;
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this.LT = 13;
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this.GT = 14;
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this.FETCH = 15;
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this.STORE = 16;
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this.ADD = 17;
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this.SUB = 18;
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this.MUL = 19;
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this.DIVMOD = 20;
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this.AND = 21;
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this.OR = 22;
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this.XOR = 23;
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this.SHIFT = 24;
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this.ZERO_EXIT = 25;
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this.HALT = 26;
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this.IE = 27;
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this.IQ = 28;
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this.II = 29;
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}
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var ip = 0;
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var data = new Stack(DATA_DEPTH);
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var address = new Stack(ADDRESS_DEPTH);
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var image = new Array(IMAGE_SIZE);
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var vm = new Opcodes();
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var instructions = new Array(vm.II + 1);
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var notfound = 0;
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var interpret = 0;
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function rxPrepareVM() {
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ip = 0;
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data.reset();
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address.reset();
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framebuffer = 0;
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}
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instructions[vm.NOP] = function() {}
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instructions[vm.LIT] = function() {
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ip++;
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data.push(image[ip]);
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}
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instructions[vm.DUP] = function() {
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data.dup();
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}
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instructions[vm.DROP] = function() {
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data.drop();
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}
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instructions[vm.SWAP] = function() {
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data.swap();
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}
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instructions[vm.PUSH] = function() {
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address.push(data.pop());
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}
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instructions[vm.POP] = function() {
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data.push(address.pop())
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}
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instructions[vm.JUMP] = function() {
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ip = data.pop() - 1;
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}
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instructions[vm.CALL] = function() {
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address.push(ip);
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ip = data.pop() - 1;
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}
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instructions[vm.CCALL] = function() {
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var a, b;
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a = data.pop();
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b = data.pop();
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if (b != 0) {
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address.push(ip);
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ip = a - 1;
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}
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}
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instructions[vm.RETURN] = function() {
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ip = address.pop();
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}
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instructions[vm.EQ] = function() {
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var a, b;
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a = data.pop();
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b = data.pop();
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if (b == a)
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data.push(-1);
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else
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data.push(0);
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}
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instructions[vm.NEQ] = function() {
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var a, b;
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a = data.pop();
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b = data.pop();
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if (b != a)
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data.push(-1);
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else
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data.push(0);
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}
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instructions[vm.LT] = function() {
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var a, b;
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a = data.pop();
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b = data.pop();
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if (b < a)
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data.push(-1);
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else
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data.push(0);
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}
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instructions[vm.GT] = function() {
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var a, b;
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a = data.pop();
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b = data.pop();
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if (b > a)
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data.push(-1);
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else
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data.push(0);
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}
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instructions[vm.FETCH] = function() {
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x = data.pop();
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if (x == -1)
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data.push(data.sp);
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else if (x == -2)
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data.push(address.sp);
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else if (x == -3)
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data.push(IMAGE_SIZE);
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else if (x == -4)
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data.push(-2147483648);
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else if (x == -5)
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data.push(2147483647);
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else
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data.push(image[x]);
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}
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instructions[vm.STORE] = function() {
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image[data.tos()] = data.nos();
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data.drop();
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data.drop();
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}
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instructions[vm.ADD] = function() {
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var x = data.pop();
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var y = data.pop();
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data.push(x + y);
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}
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instructions[vm.SUB] = function() {
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var x = data.pop();
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var y = data.pop();
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data.push(y - x);
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}
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instructions[vm.MUL] = function() {
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var x = data.pop();
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var y = data.pop();
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data.push(y * x);
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}
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instructions[vm.DIVMOD] = function() {
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var b = data.pop();
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var a = data.pop();
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if (b == 0) {
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ip = 0;
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data.sp = 0;
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address.sp = 0;
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} else {
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var x = Math.abs(b);
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var y = Math.abs(a);
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var q = Math.floor(y / x);
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var r = y % x;
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if (a < 0 && b < 0)
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r = r * -1;
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if (a > 0 && b < 0)
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q = q * -1;
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if (a < 0 && b > 0) {
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r = r * -1;
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q = q * -1;
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}
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data.push(r);
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data.push(q);
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}
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}
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instructions[vm.AND] = function() {
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var x = data.pop();
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var y = data.pop();
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data.push(x & y);
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}
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instructions[vm.OR] = function() {
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var x = data.pop();
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var y = data.pop();
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data.push(x | y);
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}
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instructions[vm.XOR] = function() {
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var x = data.pop();
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var y = data.pop();
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data.push(x ^ y);
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}
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instructions[vm.SHIFT] = function() {
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var x = data.pop();
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var y = data.pop();
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if (x < 0)
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data.push(y << (x * -1));
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else
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data.push(y >>= x);
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}
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instructions[vm.ZERO_EXIT] = function() {
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if (data.tos() == 0) {
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data.drop();
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ip = address.pop();
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}
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}
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instructions[vm.HALT] = function() {
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ip = IMAGE_SIZE;
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}
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instructions[vm.IE] = function() {
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data.push(2);
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}
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instructions[vm.IQ] = function() {
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var chosen = data.pop();
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if (chosen == 0) {
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data.push(0);
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data.push(0);
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} else if (chosen == 1) {
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data.push(20);
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data.push(0);
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}
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}
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instructions[vm.II] = function() {
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var chosen = data.pop();
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if (chosen == 0) {
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var s = String.fromCharCode(data.pop());
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document.getElementById('console').value += s;
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} else if (chosen == 1) {
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draw(data.pop())
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}
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}
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window.addEventListener('load', function(e) {
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rxPrepareVM();
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}, false);
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function processOpcode(opcode) {
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if (opcode != 0) {
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instructions[opcode]();
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checkStack();
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}
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}
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function validatePackedOpcodes(opcode) {
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var raw = opcode;
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var current;
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var valid = -1;
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var i = 0;
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while (i < 4) {
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current = raw & 0xFF;
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if (!current >= 0 && current <= 29)
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valid = 0;
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raw = raw >> 8;
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i++;
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}
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}
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function ngaProcessPackedOpcodes(opcode) {
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var raw = opcode;
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ops = new Array(3);
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ops[0] = raw & (255);
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raw = raw >> 8;
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ops[1] = raw & (255);
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raw = raw >> 8;
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ops[2] = raw & (255);
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raw = raw >> 8;
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ops[3] = raw & (255);
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processOpcode(ops[0]);
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processOpcode(ops[1]);
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processOpcode(ops[2]);
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processOpcode(ops[3]);
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}
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function loadInitialImage() {
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image = ngaImage.slice();
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}
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function execute(offset) {
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var opcode;
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address.sp = 1;
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ip = offset;
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while (ip < IMAGE_SIZE) {
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opcode = image[ip];
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if (ip == notfound) {
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document.getElementById('console').value +=
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"err:notfound : " + string_extract(1024) + "\n";
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}
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if (validatePackedOpcodes(opcode) != 0) {
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ngaProcessPackedOpcodes(opcode);
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} else {
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alert("Invalid instruction!");
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alert("At " + ip + ", opcode " + opcode);
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}
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if (address.sp == 0)
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ip = IMAGE_SIZE;
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ip++;
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}
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}
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function checkStack() {
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var depth = data.depth();
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var adepth = address.depth();
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var flag = 0;
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if (depth < 0 || adepth < 0) {
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flag = -1;
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}
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if (depth > DATA_DEPTH || adepth > DATA_DEPTH) {
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flag = -1;
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}
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if (flag == -1) {
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ip = 0;
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data.sp = 0;
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address.sp = 0;
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}
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}
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function string_inject(str, buffer) {
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var m = str.length;
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var i = 0;
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while (m > 0) {
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image[buffer + i] = str[i].charCodeAt(0);
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image[buffer + i + 1] = 0;
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m--;
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i++;
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}
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}
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function string_extract(at) {
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string_data = "";
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var starting = at;
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var i = 0;
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while (image[starting] != 0)
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string_data += String.fromCharCode(image[starting++]);
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return string_data;
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}
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function d_xt(dt) {
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return dt + 1;
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}
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function d_name(dt) {
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return dt + 3;
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}
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function d_lookup(name) {
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var dt = 0;
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var i = image[2];
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var dname;
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while (image[i] != 0 && i != 0) {
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dname = string_extract(d_name(i));
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if (dname == name) {
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dt = i;
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i = 0;
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} else {
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i = image[i];
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}
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}
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return dt;
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}
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function d_xt_for(name) {
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return image[d_xt(d_lookup(name))];
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}
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function evaluate(s) {
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if (s.length == 0)
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return;
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string_inject(s, 1024);
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data.push(1024);
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execute(interpret);
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}
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function cls() {
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document.getElementById('console').value = "";
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const context = canvas.getContext('2d');
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context.clearRect(0, 0, canvas.width, canvas.height);
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}
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function unu(src) {
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raw = src.split("\n");
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var i = raw.length;
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var lines = new Array();
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var j = 0;
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var code = 0;
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while (j < i) {
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if (code == 1 && raw[j] == "~~~") {
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code = 0;
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} else if (code == 0 && raw[j] == "~~~") {
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code = 1;
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} else if (code == 1) {
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lines.push(raw[j]);
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}
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j++;
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}
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return lines.join(" ");
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}
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function go() {
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rxPrepareVM();
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loadInitialImage();
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notfound = d_xt_for("err:notfound");
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interpret = d_xt_for("interpret");
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document.getElementById("console").value = "";
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src = document.getElementById("input").value;
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tokens = unu(src).match(/\S+/g);
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var i = tokens.length;
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var j = 0;
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while (j < i) {
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evaluate(tokens[j]);
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j++;
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}
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s = "";
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i = data.depth();
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j = 1;
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while (j <= i) {
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s = s + data.data[j] + " ";
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j++;
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}
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document.getElementById("console").value += "\n" + s;
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if (framebuffer === 0) {
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var canvas = document.getElementById('canvas');
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canvas.style.display = "none";
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} else {
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var canvas = document.getElementById('canvas');
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canvas.style.display = "block";
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}
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}
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function saveproject() {
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src = document.getElementById("input").value;
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localStorage.setItem("Snapshot", src);
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}
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function loadproject() {
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src = localStorage.getItem("Snapshot");
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document.getElementById("input").value = src;
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}
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function draw(fb_start) {
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framebuffer = 1;
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var canvas = document.getElementById('canvas');
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var ctx = canvas.getContext('2d');
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var imgData = ctx.createImageData(300, 300);
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var i;
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for (i = 0; i < imgData.data.length / 4; i += 1) {
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imgData.data[i * 4 + 0] = ((image[i + fb_start] >> 8) >> 8) & 255;
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imgData.data[i * 4 + 1] = (image[i + fb_start] >> 8) & 255;
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imgData.data[i * 4 + 2] = image[i + fb_start] & 255;
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imgData.data[i * 4 + 3] = 255;
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}
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ctx.putImageData(imgData, 0, 0);
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}
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