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'use strict';
const { AddrMode } = require('./enum.js');
exports.DAT = function(core, pc, ins) {
// do nothing and die
return [];
}
exports.MOV = function(core, pc, ins) {
if (ins.a.mode === AddrMode.Immediate) {
const dst = core.getValue(pc, ins.b);
dst.b.value = ins.a.value;
} else {
const src = core.getValue(pc, ins.a);
const dstLocation = core.getLocation(pc, ins.b);
// hacky deep copy
core.data[dstLocation] = JSON.parse(JSON.stringify(src));
}
return [core.normalize(pc, 1)];
}
exports.ADD = function(core, pc, ins) {
if (ins.a.mode === AddrMode.Immediate) {
const dst = core.getValue(pc, ins.b);
dst.b.value += ins.a.value;
} else {
const src = core.getValue(pc, ins.a);
const dst = core.getValue(pc, ins.b);
dst.a.value += src.a.value;
dst.b.value += src.b.value;
}
return [core.normalize(pc, 1)];
}
exports.SUB = function(core, pc, ins) {
if (ins.a.mode === AddrMode.Immediate) {
const dst = core.getValue(pc, ins.b);
dst.b.value -= ins.a.value;
} else {
const src = core.getValue(pc, ins.a);
const dst = core.getValue(pc, ins.b);
dst.a.value -= src.a.value;
dst.b.value -= src.b.value;
}
return [core.normalize(pc, 1)];
}
exports.CMP = function(core, pc, ins) {
if (ins.a.mode === AddrMode.Immediate) {
const test = core.getValue(pc, ins.b);
if (test.b.value === ins.a.value) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
} else {
const left = core.getValue(pc, ins.a);
const right = core.getValue(pc, ins.b);
if (
// compare opcode
left.opcode === right.opcode &&
// compare a-field
left.a.mode === right.a.mode &&
left.a.value === right.a.value &&
// compare b-field
left.b.mode === right.b.mode &&
left.b.value === right.b.value
) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
}
}
exports.SLT = function(core, pc, ins) {
if (ins.a.mode === AddrMode.Immediate) {
const test = core.getValue(pc, ins.b);
if (ins.a.value < test.b.value) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
} else {
const left = core.getValue(pc, ins.a);
const right = core.getValue(pc, ins.b);
if (left.b.value < right.b.value) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
}
}
exports.JMP = function(core, pc, ins) {
const dstLoc = core.getLocation(pc, ins.a);
return [dstLoc];
}
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