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assembler.js
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/*
* This code (the core of the assembler) is rather hard-to-follow due to
* many if-branchings. I don't know how good assemblers solve that problem.
* I have asked that question on r/learnprogramming:
* https://www.reddit.com/r/learnprogramming/comments/17dwo2m/what_do_the_cores_of_good_assemblers_the_things/?utm_source=share&utm_medium=web2x&context=3
* I have also asked that on CodeReview StackExchange:
* https://codereview.stackexchange.com/q/287582/219010
* So, maybe it would be a good idea to try to apply the suggestions I
* received there.
*/
"use strict";
function formatAsByte(n) {
n = Math.round(n);
if (n < 0 || n > 255) {
alert("Some part of the assembler tried to format the number " + n +
" as a byte, which makes no sense.");
return "ff";
}
let ret = n.toString(16);
while (ret.length < 2)
ret = "0" + ret;
return ret;
}
function formatAsInstruction(n) {
n = Math.round(n);
if (n < 0 || n >= 1 << 18) {
alert("Some part of the assembler tried to format the number " + n +
" as an instruction, which makes no sense.");
return "fffff";
}
let ret = n.toString(16);
while (ret.length < 5)
ret = "0" + ret;
return ret;
}
function formatAs4bits(n) {
n = Math.round(n);
if (n < 0 || n >= 1 << 4) {
alert("Some part of the assembler tried to format the number " + n +
" as a single hexadecimal digit, which makes no sense.");
return "f";
}
let ret = n.toString(16);
while (ret.length < 1)
ret = "0" + ret;
return ret;
}
function isDirective(str) {
if (typeof str !== "string") {
alert(
'Internal compiler error: The first argument of the "isDirective" function is not a string!');
return false;
}
for (const directive of preprocessor)
if (RegExp("^" + directive + "$", "i").test(str))
return true;
if (/:$/.test(str) && str.length > 1) // To the core of the assembler, labels
// are preprocessor directives.
return true;
return false;
}
function assemble(root_of_abstract_syntax_tree, output_of_preprocessor) {
if (!(root_of_abstract_syntax_tree instanceof TreeNode) ||
root_of_abstract_syntax_tree.text !== "assembly") {
alert(
"Internal assembler error: The first argument of the \"assemble\" function is not the root of the abstract syntax tree (AST)!");
return;
}
machineCode = [];
for (let i = 0; i < 4096; i++)
machineCode.push({hex : "00000", line : 0});
let address = 0;
default_base_of_literals_in_assembly = 16;
for (const node_of_depth_1 of root_of_abstract_syntax_tree.children) {
const check_if_the_only_argument_is_register = () => {
// Let's reduce the code repetition a bit by using lambda functions...
if (node_of_depth_1.children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber + ': The AST node "' +
node_of_depth_1.text + '" should have exactly 1 child node!');
return 0;
}
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text +
'" is not a valid register name!');
return 0;
}
return 1;
};
const check_if_there_are_three_child_nodes_and_the_second_one_is_comma = () => {
if (node_of_depth_1.children.length !== 3) {
alert(
"Line #" + node_of_depth_1.lineNumber + ': The AST node "' +
node_of_depth_1.text +
'" should have exactly three child nodes (a comma is also a child node).');
return 0; // If we just `return` (not `return 0`), it will cause this
// bug:
// https://github.com/FlatAssembler/PicoBlaze_Simulator_in_JS/issues/18
}
if (node_of_depth_1.children[1].text !== ",") {
alert("Line #" + node_of_depth_1.lineNumber +
': Expected a comma instead of "' +
node_of_depth_1.children[1].text + '"!');
return 0;
}
return 1;
};
if (/^BASE_HEXADECIMAL$/i.test(node_of_depth_1.text))
default_base_of_literals_in_assembly = 16;
else if (/^BASE_DECIMAL$/i.test(node_of_depth_1.text))
default_base_of_literals_in_assembly = 10;
// TODO: What if there is a BASE_DECIMAL or BASE_DECIMAL inside an
// if-statement or a while-loop? You can see a discussion on that here:
// https://github.com/FlatAssembler/PicoBlaze_Simulator_in_JS/issues/34
else if (/^address$/i.test(node_of_depth_1.text))
address = node_of_depth_1.children[0].interpretAsArithmeticExpression(
output_of_preprocessor.constants);
else if (/^load$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
// TODO: "bennyboy" from "atheistforums.org" thinks that
// doing this check (whether an argument is a register) again and again
// slows down the assembler significantly, it would be good to
// investigate whether that is true:
// https://atheistforums.org/thread-61911-post-2112572.html#pid2112572
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
// If we are moving a constant to a register.
machineCode[address].hex += "1";
else
machineCode[address].hex += "0";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^star$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
// If we are moving a constant to a register.
machineCode[address].hex += "7";
else
machineCode[address].hex += "6";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^store$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "2";
if (node_of_depth_1.children[2].text === "()")
machineCode[address].hex += "e";
else
machineCode[address].hex += "f";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].text === "()") {
if (node_of_depth_1.children[2].children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber +
": The node '()' should have exactly one child!");
return;
}
if (node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[2].children[0].text +
'" is not a register!');
return;
}
machineCode[address].hex +=
node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
} else
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
address++;
} else if (/^fetch$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].text === "()")
machineCode[address].hex += "a";
else
machineCode[address].hex += "b";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].text === "()") {
if (node_of_depth_1.children[2].children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber +
": The node '()' should have exactly one child!");
return;
}
if (node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[2].children[0].text +
'" is not a register!');
return;
}
machineCode[address].hex +=
node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
} else
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
address++;
} else if (/^input$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].text === "()")
machineCode[address].hex += "8";
else
machineCode[address].hex += "9";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].text === "()") {
if (node_of_depth_1.children[2].children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber +
": The node '()' should have exactly one child!");
return;
}
if (node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[2].children[0].text +
'" is not a register!');
return;
}
machineCode[address].hex +=
node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
} else
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
address++;
} else if (/^output$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "2";
if (node_of_depth_1.children[2].text === "()")
machineCode[address].hex += "c";
else
machineCode[address].hex += "d";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].text === "()") {
if (node_of_depth_1.children[2].children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber +
": The node '()' should have exactly one child!");
return;
}
if (node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[2].children[0].text +
'" is not a register!');
return;
}
machineCode[address].hex +=
node_of_depth_1.children[2].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
} else
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
address++;
} else if (/^outputk$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex =
"2b" +
formatAsByte(
node_of_depth_1.children[0].interpretAsArithmeticExpression(
output_of_preprocessor.constants)) +
formatAs4bits(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
address++;
} else if (/^regbank$/i.test(node_of_depth_1.text)) {
if (node_of_depth_1.children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber + ': The AST node "' +
node_of_depth_1.text + '" should have exactly one (1) child!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
if (node_of_depth_1.children[0].text === "a" ||
node_of_depth_1.children[0].text === "A")
machineCode[address].hex = "37000";
else if (node_of_depth_1.children[0].text === "b" ||
node_of_depth_1.children[0].text === "B")
machineCode[address].hex = "37001";
else {
alert("Line #" + node_of_depth_1.lineNumber +
": Expected 'A' or 'B' instead of '" +
node_of_depth_1.children[0].text + "'!");
return;
}
address++;
} else if (/^hwbuild$/i.test(node_of_depth_1.text)) {
if (node_of_depth_1.children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber + ': The AST node "' +
node_of_depth_1.text + '" should have exactly one (1) child!');
return;
}
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "14" +
node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"80";
address++;
} else if (/^inst$/i.test(node_of_depth_1.text)) {
if (node_of_depth_1.children.length !== 1) {
alert("Line #" + node_of_depth_1.lineNumber + ': The AST node "' +
node_of_depth_1.text + '" should have exactly one (1) child!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = formatAsInstruction(
node_of_depth_1.children[0].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
address++;
} else if (/^jump$/i.test(node_of_depth_1.text)) {
machineCode[address].line = node_of_depth_1.lineNumber;
if (node_of_depth_1.children.length === 1) {
if (node_of_depth_1.children[0].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": Label '" +
node_of_depth_1.children[0].text + "' is not declared!");
return;
}
machineCode[address].hex =
"22" + node_of_depth_1.children[0].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
} else {
if (node_of_depth_1.children.length !== 3) {
alert(
"Line #" + node_of_depth_1.lineNumber + ": The '" +
node_of_depth_1.text +
"' node should have either exactly one child node (unconditional jumping) or exactly three (3) child nodes (comma counts as a child node)!");
return;
}
if (node_of_depth_1.children[1].text !== ",") {
alert(
"Line #" + node_of_depth_1.lineNumber +
": Expected a comma (',') instead of '" +
node_of_depth_1.children[1]
.text + // https://github.com/FlatAssembler/PicoBlaze_Simulator_in_JS/issues/21
"'!");
return;
}
if (node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": Label '" +
node_of_depth_1.children[2].text + "' is not declared!");
return;
}
if (/^z$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"32" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else if (/^nz$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"36" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else if (/^c$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"3a" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else if (/^nc$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"3e" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else {
alert("Line #" + node_of_depth_1.lineNumber +
": Invalid flag name '" + node_of_depth_1.children[0].text +
"'!");
return;
}
}
address++;
} else if (/^jump@$/i.test(node_of_depth_1.text)) {
if (node_of_depth_1.children.length !== 1 ||
node_of_depth_1.children[0].text !== "()") {
alert("Line #" + node_of_depth_1.lineNumber + ": The '" +
node_of_depth_1.text +
"' node should have exactly one (1) child, and that is '()'");
return;
}
if (node_of_depth_1.children[0].children.length !== 3) {
alert(
"Line #" + node_of_depth_1.lineNumber +
": The '()' node should have exactly three children (now it has " +
node_of_depth_1.children[0].children.length + ")!");
return;
}
if (node_of_depth_1.children[0].children[1].text !== ",") {
alert("Line #" + node_of_depth_1.lineNumber +
": Expected a comma (',') instead of '" +
node_of_depth_1.children[0].children[1].text + "'!");
return;
}
if (node_of_depth_1.children[0].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": '" +
node_of_depth_1.children[0].children[0].text +
"' is not a register name!");
return;
}
if (node_of_depth_1.children[0].children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": '" +
node_of_depth_1.children[0].children[2].text +
"' is not a register name!");
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex =
"26" +
node_of_depth_1.children[0].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
node_of_depth_1.children[0].children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^call@$/i.test(node_of_depth_1.text)) {
if (node_of_depth_1.children.length !== 1 ||
node_of_depth_1.children[0].text !== "()") {
alert("Line #" + node_of_depth_1.lineNumber + ": The '" +
node_of_depth_1.text +
"' node should have exactly one (1) child, and that is '()'");
return;
}
if (node_of_depth_1.children[0].children.length !== 3) {
alert(
"Line #" + node_of_depth_1.lineNumber +
": The '()' node should have exactly three children (now it has " +
node_of_depth_1.children[0].children.length + ")!");
return;
}
if (node_of_depth_1.children[0].children[1].text !== ",") {
alert("Line #" + node_of_depth_1.lineNumber +
": Expected a comma (',') instead of '" +
node_of_depth_1.children[0].children[1].text + "'!");
return;
}
if (node_of_depth_1.children[0].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": '" +
node_of_depth_1.children[0].children[0].text +
"' is not a register name!");
return;
}
if (node_of_depth_1.children[0].children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": '" +
node_of_depth_1.children[0].children[2].text +
"' is not a register name!");
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex =
"24" +
node_of_depth_1.children[0].children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
node_of_depth_1.children[0].children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^call$/i.test(node_of_depth_1.text)) {
machineCode[address].line = node_of_depth_1.lineNumber;
if (node_of_depth_1.children.length === 1) {
if (node_of_depth_1.children[0].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": Label '" +
node_of_depth_1.children[0].text + "' is not declared!");
return;
}
machineCode[address].hex =
"20" + node_of_depth_1.children[0].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
} else {
if (node_of_depth_1.children.length !== 3) {
alert(
"Line #" + node_of_depth_1.lineNumber + ": The '" +
node_of_depth_1.text +
"' node should have either exactly one child node (unconditional jumping) or exactly three (3) child nodes (comma counts as a child node)!");
return;
}
if (node_of_depth_1.children[1].text !== ",") {
alert("Line #" + node_of_depth_1.lineNumber +
": Expected a comma (',') instead of '" + node_of_depth_1.text +
"'!");
return;
}
if (node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ": Label '" +
node_of_depth_1.children[2].text + "' is not declared!");
return;
}
if (/^z$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"30" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else if (/^nz$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"34" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else if (/^c$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"38" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else if (/^nc$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex =
"3c" + node_of_depth_1.children[2].getLabelAddress(
output_of_preprocessor.labels,
output_of_preprocessor.constants);
else {
alert("Line #" + node_of_depth_1.lineNumber +
": Invalid flag name '" + node_of_depth_1.children[0].text +
"'!");
return;
}
}
address++;
} else if (/^return$/i.test(node_of_depth_1.text)) {
machineCode[address].line = node_of_depth_1.lineNumber;
if (!node_of_depth_1.children.length)
machineCode[address].hex = "25000";
else if (node_of_depth_1.children.length === 1) {
if (/^z$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex = "31000";
else if (/^nz$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex = "35000";
else if (/^c$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex = "39000";
else if (/^nc$/i.test(node_of_depth_1.children[0].text))
machineCode[address].hex = "3d000";
else {
alert("Line #" + node_of_depth_1.lineNumber +
": Invalid flag name '" + node_of_depth_1.children[0].text +
"'");
return;
}
} else {
alert(
"Line #" + node_of_depth_1.lineNumber + ": The '" +
node_of_depth_1.text +
"' node should have either exactly zero (0) child nodes or exactly one (1) child node!");
return;
}
address++;
} else if (/^add$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
// If we are adding a constant to a register.
machineCode[address].hex += "1";
else
machineCode[address].hex += "0";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^addcy?$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
// If we are adding a constant to a register.
machineCode[address].hex += "3";
else
machineCode[address].hex += "2";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^sub$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
// If we are subtracting a constant from a register.
machineCode[address].hex += "9";
else
machineCode[address].hex += "8";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^subcy?$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
// If we are subtracting a constant from a register.
machineCode[address].hex += "b";
else
machineCode[address].hex += "a";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^and$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "3";
else
machineCode[address].hex += "2";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^or$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "5";
else
machineCode[address].hex += "4";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^xor$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "7";
else
machineCode[address].hex += "6";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^test$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "d";
else
machineCode[address].hex += "c";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^testcy?$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "0";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "f";
else
machineCode[address].hex += "e";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^comp(are)?$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "d";
else
machineCode[address].hex += "c";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^comp(are)?cy$/i.test(node_of_depth_1.text)) {
if (!check_if_there_are_three_child_nodes_and_the_second_one_is_comma())
return;
if (node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none") {
alert("Line #" + node_of_depth_1.lineNumber + ': "' +
node_of_depth_1.children[0].text + '" is not a register!');
return;
}
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "1";
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += "f";
else
machineCode[address].hex += "e";
machineCode[address].hex += node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters);
if (node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) === "none")
machineCode[address].hex += formatAsByte(
node_of_depth_1.children[2].interpretAsArithmeticExpression(
output_of_preprocessor.constants));
else
machineCode[address].hex +=
node_of_depth_1.children[2].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"0";
address++;
} else if (/^sl0$/i.test(node_of_depth_1.text)) {
if (!check_if_the_only_argument_is_register())
return;
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "14" +
node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"06";
address++;
} else if (/^sl1$/i.test(node_of_depth_1.text)) {
if (!check_if_the_only_argument_is_register())
return;
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "14" +
node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"07";
address++;
} else if (/^slx$/i.test(node_of_depth_1.text)) {
if (!check_if_the_only_argument_is_register())
return;
machineCode[address].line = node_of_depth_1.lineNumber;
machineCode[address].hex = "14" +
node_of_depth_1.children[0].getRegisterNumber(
output_of_preprocessor.namedRegisters) +
"04";
address++;