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namespace Q1.Compiler;
public class CCompilerVisitor : CGrammarBaseVisitor<string?>
{
private List<string> Instructions = new();
public IEnumerable<string> Compile(CGrammarParser.ProgramContext program)
{
this.Visit(program);
return this.Instructions;
}
public override string? VisitFunction(CGrammarParser.FunctionContext context)
{
string functionName = context.ID().GetText();
Instructions.Add($"_{functionName}:");
this.VisitChildren(context);
this.Instructions.Add("");
return null;
}
public override string? VisitParenthesizedExpression(CGrammarParser.ParenthesizedExpressionContext context)
{
return this.Visit(context.expression());
}
public override string? VisitReturnStatement(CGrammarParser.ReturnStatementContext context)
{
if (context.expression() != null)
{
string? expression = this.Visit(context.expression());
if (expression != null)
{
this.Instructions.Add($"MOV {expression}, V0");
Instructions.Add($"RET");
}
else
throw new CompilerException("Return value was not an expression.");
}
else
Instructions.Add("RET");
return null;
}
public override string? VisitIntConstant(CGrammarParser.IntConstantContext context)
{
string valueString = context.INT().GetText();
if (int.TryParse(valueString, out int value))
return $"{value}";
else
throw new CompilerException($"Invalid integer value: {valueString}");
}
public override string? VisitNotExpression(CGrammarParser.NotExpressionContext context)
{
string? value = this.Visit(context.expression());
if (value == null)
throw new CompilerException("Value for negating was not an expression.");
this.Instructions.Add($"NOT {value}");
return "LX";
}
public override string? VisitInvertExpression(CGrammarParser.InvertExpressionContext context)
{
string? value = this.Visit(context.expression());
if (value == null)
throw new CompilerException("Value for inversion was not an expression.");
this.Instructions.Add($"INV {value}");
return "DX";
}
public override string? VisitAddExpression(CGrammarParser.AddExpressionContext context)
{
string? left = this.Visit(context.left);
string? right = this.Visit(context.right);
if (left == null || right == null)
throw new CompilerException("Left or right operand for addition was not an expression.");
this.Instructions.Add($"ADD {left}, {right}");
return "AX";
}
public override string? VisitSubtractExpression(CGrammarParser.SubtractExpressionContext context)
{
string? left = this.Visit(context.left);
string? right = this.Visit(context.right);
if (left == null || right == null)
throw new CompilerException("Left or right operand for subtraction was not an expression.");
this.Instructions.Add($"SUB {left}, {right}");
return "AX";
}
public override string? VisitMultiplyExpression(CGrammarParser.MultiplyExpressionContext context)
{
string? left = this.Visit(context.left);
string? right = this.Visit(context.right);
if (left == null || right == null)
throw new CompilerException("Left or right operand for multiplication was not an expression.");
this.Instructions.Add($"MUL {left}, {right}");
return "AX";
}
public override string? VisitDivideExpression(CGrammarParser.DivideExpressionContext context)
{
string? left = this.Visit(context.left);
string? right = this.Visit(context.right);
if (left == null || right == null)
throw new CompilerException("Left or right operand for division was not an expression.");
this.Instructions.Add($"DIV {left}, {right}");
return "AX";
}
public override string? VisitModulusExpression(CGrammarParser.ModulusExpressionContext context)
{
string? left = this.Visit(context.left);
string? right = this.Visit(context.right);
if (left == null || right == null)
throw new CompilerException("Left or right operand for modulus was not an expression.");
this.Instructions.Add($"MOD {left}, {right}");
return "AX";
}
public override string? VisitBitwiseXorExpression(CGrammarParser.BitwiseXorExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitLessThanOrEqualExpression(CGrammarParser.LessThanOrEqualExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitNotEqualExpression(CGrammarParser.NotEqualExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitGreaterThanExpression(CGrammarParser.GreaterThanExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitLogicalOrExpression(CGrammarParser.LogicalOrExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitGreaterThanOrEqualExpression(CGrammarParser.GreaterThanOrEqualExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitBitwiseOrExpression(CGrammarParser.BitwiseOrExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitBitwiseAndExpression(CGrammarParser.BitwiseAndExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitLessThanExpression(CGrammarParser.LessThanExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitLogicalAndExpression(CGrammarParser.LogicalAndExpressionContext context)
{
throw new NotImplementedException();
}
public override string? VisitEqualExpression(CGrammarParser.EqualExpressionContext context)
{
throw new NotImplementedException();
}
}
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