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'use strict';
const { AddrMode } = require('./enum.js');
function getOp(core, pc, op) {
switch(op.mode) {
case AddrMode.Immediate:
return { mode: AddrMode.Immediate, value: op.value };
default:
return { mode: 'precomp', value: core.getLocation(pc, op) };
}
}
function Instruction(f) {
return function(core, pc, ins) {
const a = getOp(core, pc, ins.a);
const b = getOp(core, pc, ins.b);
return f(core, pc, a, b);
}
}
exports.DAT = Instruction((core, pc, a, b) => {
// do nothing and die
return [];
});
exports.MOV = Instruction((core, pc, a, b) => {
if (a.mode === AddrMode.Immediate) {
const dst = core.data[b.value];
dst.b.value = a.value;
} else {
const src = core.data[a.value];
// hacky deep copy
core.data[b.value] = JSON.parse(JSON.stringify(src));
}
return [core.normalize(pc, 1)];
});
exports.ADD = Instruction((core, pc, a, b) => {
if (a.mode === AddrMode.Immediate) {
const dst = core.data[b.value];
dst.b.value += a.value;
} else {
const src = core.data[a.value];
const dst = core.data[b.value];
dst.a.value += src.a.value;
dst.b.value += src.b.value;
}
return [core.normalize(pc, 1)];
});
exports.SUB = Instruction((core, pc, a, b) => {
if (a.mode === AddrMode.Immediate) {
const dst = core.data[b.value];
dst.b.value -= a.value;
} else {
const src = core.data[a.value];
const dst = core.data[b.value];
dst.a.value -= src.a.value;
dst.b.value -= src.b.value;
}
return [core.normalize(pc, 1)];
});
exports.CMP = Instruction((core, pc, a, b) => {
if (a.mode === AddrMode.Immediate) {
const test = core.data[b.value];
if (test.b.value === a.value) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
} else {
const left = core.data[a.value];
const right = core.data[b.value];
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 = Instruction((core, pc, a, b) => {
if (a.mode === AddrMode.Immediate) {
const test = core.data[b.value];
if (a.value < test.b.value) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
} else {
const left = core.data[a.value];
const right = core.data[b.value];
if (left.b.value < right.b.value) {
return [core.normalize(pc, 2)];
} else {
return [core.normalize(pc, 1)];
}
}
});
exports.JMP = Instruction((core, pc, a, b) => {
return [a.value];
});
exports.JMZ = Instruction((core, pc, a, b) => {
let test
if (b.mode === AddrMode.Immediate) {
test = (b.value === 0);
} else {
const src = core.data[b.value];
test = (src.b.value === 0);
}
if (test) {
return [a.value];
} else {
return [core.normalize(pc, 1)];
}
});
exports.JMN = Instruction((core, pc, a, b) => {
let test;
if (b.mode === AddrMode.Immediate) {
test = (b.value !== 0);
} else {
const src = core.data[b.value];
test = (src.b.value !== 0);
}
if (test) {
return [a.value];
} else {
return [core.normalize(pc, 1)];
}
});
exports.DJN = Instruction((core, pc, a, b) => {
let test;
if (b.mode === AddrMode.Immediate) {
core.data[pc].b.value -= 1;
b.value -= 1;
test = (b.value !== 0);
} else {
const src = core.data[b.value];
src.b.value -= 1;
test = (src.b.value !== 0);
}
if (test) {
return [a.value];
} else {
return [core.normalize(pc, 1)];
}
});
exports.SPL = Instruction((core, pc, a, b) => {
return [
core.normalize(pc, 1),
a.value,
];
});
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