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namespace Q1.Compiler.visitors;
public partial class CCompilerVisitor
{
private Target VisitTarget(CGrammarParser.TargetContext target)
{
Target? expressionString = this.Visit(target) as Target;
if (expressionString == null)
throw new CompilerException("Target did not return a target");
return expressionString;
}
public override Target VisitVariableTarget(CGrammarParser.VariableTargetContext context)
{
string varName = context.ID().GetText();
VariableReference reference = this.FindVariable(varName);
return new Target(reference.Type, $"[${reference.Address:X4}]", $"${reference.Address:X4}");
}
public override object? VisitIndexerTarget(CGrammarParser.IndexerTargetContext context)
{
Target obj = this.VisitTarget(context.obj);
if (obj.Type is not CTypePtr ptr)
throw new CompilerException("Indexer target was not a pointer!");
this.Instruction($"push {obj.Value}", "store index obj");
string indexer = this.VisitExpression(context.indexer);
this.Instruction($"mov {indexer}, V1", "store indexer");
this.Instruction($"pop V0", "restore index obj");
this.Instruction($"mul V1, {ptr.Sub.Size}", $"multiply indexer by {ptr.Sub.Size}");
this.Instruction($"add AX, V0", "add indexer and index obj");
this.Instruction($"mov AX, V0", "move to general purpose register");
return new Target(ptr.Sub, $"[V0]", $"V0");
}
}
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