internal static TableAddStatus AddVar(VarSymbol varItem)
{
if (FindVar(varItem.name)?.scopeId == ScopeManager.CurrentScope)
{
return(TableAddStatus.SYMBOL_EXIST);
}
if (!vars.ContainsKey(varItem.name))
{
vars.Add(varItem.name, new List <VarSymbol>());
}
vars[varItem.name].Add(varItem);
vars[varItem.name].Sort((x, y) => y.scopeId - x.scopeId);
return(TableAddStatus.SUCCEED);
}
private void Para(FunSymbol fun)
{
VarSymbol para = new VarSymbol();
para.type = Utils.TagToType(next.Tag);
Move();
string id = TagIs(Tag.ID) ? next.Value : null;
if (id != null)
{
Move();
}
if (para.type != VarType.TYPE_VOID)
{
para.scopeId = ScopeManager.CurrentScope;
para.offsetInFun = -(2 + fun.parasType.Count) * 8;
if (TagIs(Tag.DL_LSQU))
{
para.eleType = para.type;
para.eleSize = Utils.SizeOf(para.eleType);
para.type = VarType.TYPE_PTR;
Move();
RequiredToken(Tag.DL_RSQU);
}
}
if (id != null)
{
para.name = id;
if (SymbolTable.AddVar(para) == TableAddStatus.SYMBOL_EXIST)
{
new ConflictingDeclarationError().PrintErrMsg();
}
}
fun.parasType.Add(para.type);
}
private void Decl(DeclNode node)
{
FunSymbol function = SymbolTable.FindFun(ScopeManager.CurrentFun);
VarSymbol variable = new VarSymbol();
if (TagIs(Tag.KW_CONST))
{
variable.isConst = true;
Move();
}
node.type = Utils.TagToType(next.Tag);
Move();
if (node.type == VarType.TYPE_VOID)
{
new Error().PrintErrMsg();
}
node.name = RequiredToken(Tag.ID);
if (TagIs(Tag.DL_SET))
{
Move();
node.init = new ExprNode();
Expr(node.init);
if (node.init.Type() != node.type)
{
if (!Utils.IsNumType(node.init.Type()) || !Utils.IsNumType(node.type))
{
new TypeMismatchError(node.type, node.init.Type()).PrintErrMsg();
}
}
}
else if (TagIs(Tag.DL_LSQU))
{
Move();
variable.eleSize = Utils.SizeOf(node.type);
variable.eleType = node.type;
variable.isConst = true;
node.type = VarType.TYPE_PTR;
node.size = new ExprNode();
Expr(node.size);
if (!Utils.IsNumType(node.size.Type()) || !node.size.IsConstant())
{
new Error().PrintErrMsg();
}
else
{
function.localVarSize += (int)(node.size.Val() as IntNode).value * variable.eleSize;
}
RequiredToken(Tag.DL_RSQU);
}
if (node.name != null)
{
function.localVarSize += Utils.SizeOf(node.type);
variable.name = node.name;
variable.type = node.type;
variable.scopeId = ScopeManager.CurrentScope;
variable.offsetInFun = function.localVarSize;
if (SymbolTable.AddVar(variable) == TableAddStatus.SYMBOL_EXIST)
{
new ConflictingDeclarationError().PrintErrMsg();
}
}
RequiredToken(Tag.DL_SEM);
}