public override void Visit(VariableDeclaration node)
{
switch (node.VariableKind)
{ // Local and formal variables can be referred to by their index.
// Fields need to be stored as FieldBuilders for future reference.
case VariableDeclaration.Kind.Formal:
_currentMethod.DefineParameter(node.LocalIndex,
ParameterAttributes.In, node.Name);
break;
case VariableDeclaration.Kind.Local:
// Do not generate the variable if it is never used (if optimization enabled).
if (!_parent._optimize || node.Used)
{
_currentMethod.GetILGenerator().DeclareLocal(
_parent.BuildType(node.TypeName, node.IsArray));
}
break;
case VariableDeclaration.Kind.Class:
var fieldBuilder = _currentType.DefineField(node.Name,
_parent.BuildType(node.TypeName, node.IsArray), FieldAttributes.Private);
var sym = node.Scope.ResolveVariable(node.Name);
_parent._fields[sym] = fieldBuilder;
break;
}
}
public override void Visit(VariableDeclaration node)
{
if (_pass != 1) return;
if (_previousVarKind != node.VariableKind)
{
_currentLocalIdx = 0;
}
if (node.VariableKind == VariableDeclaration.Kind.Formal)
{
// Note: this does not take static methods into account
// since the only static method in MiniJava is the main
// method and it cannot have parameters.
node.LocalIndex = (short) (1 + _currentLocalIdx++);
}
else if (node.VariableKind == VariableDeclaration.Kind.Local &&
(!_optimize || node.Used))
{
node.LocalIndex = _currentLocalIdx++;
}
_previousVarKind = node.VariableKind;
}
// Detects possible duplicate declaration of a variable identifier.
public override void Visit(VariableDeclaration node)
{
Debug.Assert(CurrentScope is IVariableScope);
node.Type = CheckDeclaredType(node);
var variableSymbol = new VariableSymbol(node.Name, node.Type, CurrentScope);
if ((CurrentScope as IVariableScope).Define(variableSymbol))
{
variableSymbol.Declaration = node;
node.Scope = CurrentScope;
}
else
{
ReportSymbolDefinitionError(node);
}
}
private bool ErrorsAlreadyReported(VariableReferenceExpression reference, VariableDeclaration declaration)
{
return _parent._errors.HasErrorReportForReferenceTo(ErrorTypes.UninitializedLocal, declaration) ||
_parent._errors.HasErrorReportForNode(ErrorTypes.LvalueReference, reference);
}