ExprNode FindSymbol(AstScope scope)
{
if (Arguments == null)
{
// Simple symbol
var symbol = scope.FindSymbol(_name);
if (symbol == null)
{
throw new CodeException($"Unrecognized symbol: '{_name}'", SourcePosition);
}
var expr = symbol as ExprNode;
if (expr == null)
{
throw new CodeException($"Invalid expression: '{_name}' is not a value", SourcePosition);
}
return(expr);
}
else
{
// Parameterized symbol
var symbol = scope.FindSymbol(_name + ExprNodeParameterized.MakeSuffix(Arguments.Length)) as ExprNodeParameterized;
if (symbol == null)
{
throw new CodeException($"Unrecognized symbol: '{_name}' (with {Arguments.Length} arguments)", SourcePosition);
}
// Resolve it
return(symbol.Resolve(SourcePosition, Arguments));
}
}
public override void DefineSymbols(AstScope currentScope)
{
if (_parameters == null)
{
_parameters = new string[0];
}
// Define the symbol
currentScope.Define(_name + ExprNodeParameterized.MakeSuffix(_parameters.Length), this);
}
public override void DefineSymbols(AstScope currentScope)
{
if (ParameterNames == null)
{
// Wrap it in an IP override declaration
currentScope.Define(_name, _value);
}
else
{
var value = new ExprNodeParameterized(SourcePosition, ParameterNames, _value);
currentScope.Define(_name + ExprNodeParameterized.MakeSuffix(ParameterNames.Length), value);
}
}
public override void Layout(AstScope currentScope, LayoutContext ctx)
{
// Is it a data declaration?
_dataType = currentScope.FindSymbol(_macroOrDataTypeName) as AstType;
if (_dataType != null)
{
// Work out how many elements in total
int totalElements = 0;
foreach (var n in _operands)
{
totalElements += n.EnumData(currentScope).Count();
}
// Reserve space
ctx.ReserveBytes(_reservedBytes = totalElements * _dataType.SizeOf);
return;
}
// Is it a macro invocation?
_macroDefinition = currentScope.FindSymbol(_macroOrDataTypeName + ExprNodeParameterized.MakeSuffix(_operands.Count)) as AstMacroDefinition;
if (_macroDefinition != null)
{
// Create resolved scope
_resolvedScope = _macroDefinition.Resolve(currentScope, _operands.ToArray());
// Define macro symbols
_macroDefinition.DefineSymbolsResolved(_resolvedScope);
// Layout
_macroDefinition.LayoutResolved(_resolvedScope, ctx);
return;
}
throw new CodeException($"Unrecognized symbol: '{_macroOrDataTypeName}' is not a known data type or macro (with {_operands.Count} arguments)", SourcePosition);
}
