/// <summary>
/// Builds call statement
/// </summary>
/// <param name="callNode">Call statement node</param>
private void BuildCallStatement(ASTCallStatementNode callNode)
{
int argCnt = 0;
//push arguments
if (callNode.Arguments != null)
{
argCnt = callNode.Arguments.Expressions.Count;
foreach (var e in callNode.Arguments.Expressions)
{
BuildExpression(e);
_emitter.Box();
}
}
//get symbol
var symbol = (ISubroutine)_symbols.FindSymbol(callNode.ProcedureName);
if (symbol is NativeSubroutine nativeSub)
{
_emitter.Call(nativeSub.NativeMethod);
}
if (symbol is UserSubroutine userSub)
{
var m = _builtSubs[callNode.ProcedureName].Builder;
_emitter.UnwrapCall(m);
//hand handling because type not built
_emitter.StackPop(userSub.ArgumentsCount);
if (userSub.Return)
{
_emitter.StackPush(typeof(object));
}
}
}
//Pop call arguments
public override void ExitSubCallStatement([NotNull] CmanParser.SubCallStatementContext context)
{
if (_nodes.Peek() is ASTExprListNode exprListNode)
{
_nodes.Pop();
ASTCallStatementNode callStmtNode = (ASTCallStatementNode)_nodes.Peek();
callStmtNode.Arguments = exprListNode;
}
}
/// <summary>
///
/// </summary>
/// <param name="callNode">AST node of subroutine call</param>
/// <param name="requireReturn">Requires subroutine return value</param>
private void CheckSubCall(ASTCallStatementNode callNode, bool requireReturn)
{
//check define
ISubroutine sub = (ISubroutine)_symbolTable.FindSymbol(callNode.ProcedureName);
if (sub == null)
{
_messages.Add(new MessageRecord(
MsgCode.UndefinedSub,
callNode.SourcePath,
callNode.StartLine,
callNode.StartPos,
callNode.ProcedureName
));
}
else
{
//check return value
if (requireReturn)
{
if (!sub.Return)
{
_messages.Add(new MessageRecord(
MsgCode.ReturnNotFound,
callNode.SourcePath,
callNode.StartLine,
callNode.StartPos,
callNode.ProcedureName
));
}
}
//check arguments count
int argCnt = sub.ArgumentsCount;
if (callNode.Arguments != null)
{
if (argCnt > callNode.Arguments.Children.Count)
{
_messages.Add(new MessageRecord(
MsgCode.TooFewArguments,
callNode.SourcePath,
callNode.StartLine,
callNode.StartPos,
argCnt,
callNode.Arguments.Children.Count
));
}
if (argCnt < callNode.Arguments.Children.Count)
{
_messages.Add(new MessageRecord(
MsgCode.TooManyArguments,
callNode.SourcePath,
callNode.StartLine,
callNode.StartPos,
argCnt,
callNode.Arguments.Children.Count
));
}
//check arguments
foreach (var a in callNode.Arguments.Expressions)
{
CheckExpression(a);
}
}
else //no arguments
{
if (argCnt != 0)
{
_messages.Add(new MessageRecord(
MsgCode.TooFewArguments,
callNode.SourcePath,
callNode.StartLine,
callNode.StartPos,
argCnt,
0
));
}
}
}
}