/// <summary>
/// Compile an array indexer
/// </summary>
/// <param name="emitter"></param>
private void CompileArray(Emitter.Emitter emitter)
{
// ensure this is an array
var type = emitter.GetArrayItemType(ExpressionPrefix.GetExpressionType(emitter));
if (type == "")
Error(Resources.errIndexingNotAnArray);
// ensure index is integer
if (Index.GetExpressionType(emitter) != "int")
Error(Resources.errIntIndexExpected, Index.Lexem);
ExpressionPrefix.Compile(emitter);
Index.Compile(emitter);
if (type == "complex")
{
// special case of valuetypes
var typeRef = emitter.ResolveType(type);
emitter.EmitLoadIndexAddress(typeRef);
emitter.EmitLoadObject(typeRef);
}
else
emitter.EmitLoadIndex(type);
}
public override void Compile(Emitter.Emitter emitter)
{
// make sure there is an array
var exprType = Expression.GetExpressionType(emitter);
if (!exprType.Contains("[]"))
Error(Resources.errSplatArrayExpected);
// define required variables
var type = emitter.GetArrayItemType(exprType);
var typeRef = emitter.ResolveType(type);
var idx = 0;
var tmpVar = emitter.CurrentMethod.Scope.Introduce(exprType, emitter.ResolveType(exprType));
// compile array
Expression.Compile(emitter);
emitter.EmitSaveVariable(tmpVar);
foreach(var curr in Names)
{
// check for variable redefinition
if (emitter.CurrentMethod.Scope.Exists(curr.Data))
Error(String.Format(Resources.errVariableRedefinition, curr.Data), curr);
var varDecl = emitter.CurrentMethod.Scope.Introduce(type, emitter.ResolveType(type), curr.Data);
var elseLabel = emitter.CreateLabel();
var endLabel = emitter.CreateLabel();
// make sure the array is not a null
emitter.EmitLoadNull();
emitter.EmitLoadVariable(tmpVar);
emitter.EmitCompareEqual();
emitter.EmitBranchTrue(elseLabel);
// make sure there are items in the array
emitter.EmitLoadInt(idx);
emitter.EmitLoadVariable(tmpVar);
emitter.EmitLoadArraySize();
emitter.EmitCompareLess();
emitter.EmitBranchFalse(elseLabel);
// retrieve the current value
emitter.EmitLoadVariable(tmpVar);
emitter.EmitLoadInt(idx);
if(type == "complex")
{
emitter.EmitLoadIndexAddress(typeRef);
emitter.EmitLoadObject(typeRef);
}
else
emitter.EmitLoadIndex(type);
emitter.EmitBranch(endLabel);
// or create a default
emitter.PlaceLabel(elseLabel);
emitter.EmitLoadDefaultValue(type);
// assign the variable
emitter.PlaceLabel(endLabel);
emitter.EmitSaveVariable(varDecl);
idx++;
}
}