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