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assembler - Fix test for argument-less operations / Remove unnecessary variable

This commit is contained in:
n loewen 2023-08-24 15:16:12 +01:00
parent 51bc13fe5b
commit dc78518b73
1 changed files with 24 additions and 26 deletions
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50
assembler.js
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@ -212,21 +212,19 @@ function decodeInstructions(source) {
if (line.type === 'code') {
const op = line.operation;
let sourceArgument; // TODO remove null?
if (typeof line.argument != 'undefined') {
sourceArgument = line.argument;
} else {
if (typeof line.argument === 'undefined') {
// If this isn't a label definition,
// or one of the ops with optional arguments,
// then it's an error
if (!line.operation.startsWith('@')) {
if (mnemonicsWithOptionalArgs.indexOf(line.operation) < 0) {
console.error(`Missing opcode for line ${line.number}: ${line.source}`);
throw new Error("Missing opcode");
if (mnemonicsWithOptionalArgs.indexOf(line.operation.toLowerCase()) < 0) {
console.error(`Missing operand for line ${line.number}: ${line.source}`);
console.error('');
throw new Error("Missing operand");
} else {
// It *is* one of the special optional-arg ops
// So let's fill in the implicit operand with $00
sourceArgument = '0';
line.argument = '0';
}
}
}
@ -242,13 +240,13 @@ function decodeInstructions(source) {
// Opcodes - Handle constant definitions
if (op.startsWith(ASM_CONSTANT_PREFIX)) {
constants = handleConstantDefinitions(op, sourceArgument, IP, constants);
constants = handleConstantDefinitions(op, line.argument, IP, constants);
continue;
}
// Opcodes - Handle setting value of IP
if (op.startsWith(ASM_IP_LABEL)) {
IP = parseInt(sourceArgument);
IP = parseInt(line.argument);
continue;
}
@ -267,7 +265,7 @@ function decodeInstructions(source) {
line.operation = line.operation.toLowerCase();
// Operands - Handle references to labels
if (sourceArgument.startsWith(ASM_LABEL_PREFIX)) {
if (line.argument.startsWith(ASM_LABEL_PREFIX)) {
let label = line.argument.substring(1); // strip label prefix
if (label in labels) {
dbg(1, `'${label}' already in labels object`);
@ -285,30 +283,30 @@ function decodeInstructions(source) {
}
// Operands - Handle references to the Instruction Pointer
if (sourceArgument === ASM_IP_LABEL) {
if (line.argument === ASM_IP_LABEL) {
dbg(1, ` References current IP - ${IP}`);
decodedArg = IP;
}
// Operands - Handle references to constants
if (sourceArgument.startsWith(ASM_CONSTANT_PREFIX)) {
dbg(1, `References '${sourceArgument}'`);
decodedArg = decodeNumericOp(constants[sourceArgument.substring(1)]); // substring(1) strips '>'
if (line.argument.startsWith(ASM_CONSTANT_PREFIX)) {
dbg(1, `References '${line.argument}'`);
decodedArg = decodeNumericOp(constants[line.argument.substring(1)]); // substring(1) strips '>'
}
// Operands - Handle references to constants in indirect mode
if (sourceArgument.startsWith(`(${ASM_CONSTANT_PREFIX}`)) {
if (line.argument.startsWith(`(${ASM_CONSTANT_PREFIX}`)) {
addressingMode = "indirect";
dbg(1, `(Indirectly) References '${sourceArgument}'`);
let constName = sourceArgument.replace(`(${ASM_CONSTANT_PREFIX}`, "");
dbg(1, `(Indirectly) References '${line.argument}'`);
let constName = line.argument.replace(`(${ASM_CONSTANT_PREFIX}`, "");
constName = constName.replace(")", "");
decodedArg = decodeNumericOp(constants[constName]);
}
// Operands - Handle indirect expressions
if (decodedArg === null && sourceArgument.startsWith("(")) {
if (decodedArg === null && line.argument.startsWith("(")) {
addressingMode = "indirect";
let indyTemp = sourceArgument.replace("(", "").replace(")", "");
let indyTemp = line.argument.replace("(", "").replace(")", "");
decodedArg = decodeNumericOp(indyTemp);
}
@ -325,12 +323,12 @@ function decodeInstructions(source) {
machineCode[IP] = decodedOp;
machineCode[IP + 1] = decodedArg;
debugInfo[IP] = {
lineNumber: line.number,
source: line.source,
address: IP,
machine: [decodedOp, decodedArg]
};
debugInfo[IP] = {
lineNumber: line.number,
source: line.source,
address: IP,
machine: [decodedOp, decodedArg]
};
dbg(3, ``);