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'use strict';
const { Op, AddrMode} = require('./enum.js');
function mod(a, N) {
const A = a % N;
if (A < 0) {
return A + N;
} else {
return A;
}
}
class Range {
constructor(start, end, coresize) {
this.start = start;
this.end = end;
this.coresize = coresize;
}
// thanks to https://fgiesen.wordpress.com/2015/09/24/intervals-in-modular-arithmetic/
// c:
contains(n) {
return mod(n - this.start, this.coresize) <= mod(this.end - this.start, this.coresize);
}
overlaps(other) {
return (
this.contains(other.start) ||
other.contains(this.start)
);
}
}
function randomRange(coresize, length) {
const start = Math.floor(Math.random() * coresize);
const end = mod(start + length - 1, coresize);
return new Range(start, end, coresize);
}
class Core {
constructor(size) {
this.data = new Array(size);
// initialize core to all DAT 0, 0
for (let i=0; i<size; i++) {
this.data[i] = {
opcode: Op.DAT,
a: { value: 0, mode: AddrMode.Immediate },
b: { value: 0, mode: AddrMode.Immediate },
};
}
}
getRanges(lengths, ranges) {
if (ranges === undefined) {
ranges = [];
}
if (lengths.length === 0) {
return ranges;
}
const length = lengths[0];
let range;
do {
range = randomRange(this.data.length, length);
} while (
ranges
.map(r => r.overlaps(range))
.reduce((acc, overlap) => acc || overlap, false)
);
return this.getRanges(lengths.slice(1), [...ranges, range]);
}
normalize(pc, value) {
return mod((pc + value), this.data.length);
}
getLocation(pc, address) {
switch(address.mode) {
case AddrMode.Immediate:
throw "Cannot get location from immediate-mode address";
case AddrMode.Direct:
return this.normalize(pc, address.value);
case AddrMode.Indirect: {
let loc = this.normalize(pc, address.value);
let b = this.data[loc].b.value;
return this.normalize(pc, b);
}
case AddrMode.Predecrement: {
let loc = this.normalize(pc, address.value);
this.data[loc].b.value -= 1;
let b = this.data[loc].b.value;
return this.normalize(pc, b);
}
default:
throw `Invalid addressing mode "${address.mode}"`;
}
}
getValue(pc, address) {
const index = this.getLocation(pc, address);
return this.data[index];
}
}
exports.mod = mod;
exports.Range = Range;
exports.Core = Core;
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