// =================================================================
// Performs semantic analysis of this node.
// =================================================================
CASTNode* CCaseStatementASTNode::Semant(CSemanter* semanter)
{
SEMANT_TRACE("CCaseStatementASTNode");
// Only semant once.
if (Semanted == true)
{
return this;
}
Semanted = true;
// Find the switch statement we are part of.
CASTNode* scope = this;
CSwitchStatementASTNode* switchScope = NULL;
while (scope != NULL && switchScope == NULL)
{
switchScope = dynamic_cast<CSwitchStatementASTNode*>(scope);
scope = scope->Parent;
}
// Semant the expression.
for (auto iter = Expressions.begin(); iter != Expressions.end(); iter++)
{
CASTNode* node = *iter;
node = ReplaceChild(node, node->Semant(semanter));
node = ReplaceChild(node, dynamic_cast<CExpressionBaseASTNode*>(node)->CastTo(semanter, switchScope->ExpressionStatement->ExpressionResultType, Token));
(*iter) = node;
}
// Semant Body statement.
if (BodyStatement != NULL)
{
BodyStatement = ReplaceChild(BodyStatement, BodyStatement->Semant(semanter));
}
return this;
}
// =================================================================
// Performs semantic analysis on this node.
// =================================================================
CASTNode* CMethodCallExpressionASTNode::Semant(CSemanter* semanter)
{
SEMANT_TRACE("CMethodCallExpressionASTNode");
// Only semant once.
if (Semanted == true)
{
return this;
}
Semanted = true;
// Get expression representations.
CExpressionBaseASTNode* left_hand_expr = dynamic_cast<CExpressionBaseASTNode*>(LeftValue);
CExpressionBaseASTNode* right_hand_expr = dynamic_cast<CExpressionBaseASTNode*>(RightValue);
// Semant left hand node.
LeftValue = ReplaceChild(LeftValue, LeftValue->Semant(semanter));
// Make sure we can access class.
CClassASTNode* accessClass = left_hand_expr->ExpressionResultType->GetClass(semanter);
if (accessClass == NULL)
{
semanter->GetContext()->FatalError(CStringHelper::FormatString("Invalid use of scoping operator."), Token);
}
// Check we can access this class from here.
accessClass->CheckAccess(semanter, this);
// NOTE: Do not r-value semant identifier, we want to process that ourselves.
CIdentifierExpressionASTNode* identNode = dynamic_cast<CIdentifierExpressionASTNode*>(RightValue);
// Semant arguments.
std::vector<CDataType*> argument_types;
std::string argument_types_string;
for (std::vector<CASTNode*>::iterator iter = ArgumentExpressions.begin(); iter < ArgumentExpressions.end(); iter++)
{
CExpressionBaseASTNode* node = dynamic_cast<CExpressionBaseASTNode*>((*iter)->Semant(semanter));
argument_types.push_back(node->ExpressionResultType);
if (iter != ArgumentExpressions.begin())
{
argument_types_string += ", ";
}
argument_types_string += node->ExpressionResultType->ToString();
(*iter) = node;
}
// Make sure the identifier represents a valid field.
CClassMemberASTNode* declaration = accessClass->FindClassMethod(semanter, identNode->Token.Literal, argument_types, false, NULL, this);
if (declaration == NULL)
{
semanter->GetContext()->FatalError(CStringHelper::FormatString("Undefined method '%s(%s)' in class '%s'.", identNode->Token.Literal.c_str(), argument_types_string.c_str(), accessClass->ToString().c_str()), Token);
}
// UPDATE: Abstract method calling is fine. Remember we won't be able to instantiate classes that do not override all abstract methods.
// if (declaration->IsAbstract == true)
// {
// semanter->GetContext()->FatalError(CStringHelper::FormatString("Cannot call method '%s(%s)' in class '%s', method is abstract.", identNode->Token.Literal.c_str(), argument_types_string.c_str(), accessClass->ToString().c_str()), Token);
// }
ResolvedDeclaration = declaration;
// Check we can access this field from here.
declaration->CheckAccess(semanter, this);
// HACK: This is really hackish and needs fixing!
if (dynamic_cast<CThisExpressionASTNode*>(LeftValue) != NULL &&
declaration->IsStatic == true)
{
LeftValue = ReplaceChild(LeftValue, new CClassRefExpressionASTNode(NULL, Token));
LeftValue->Token.Literal = declaration->FindClassScope(semanter)->Identifier;
LeftValue->Semant(semanter);
left_hand_expr = dynamic_cast<CExpressionBaseASTNode*>(LeftValue);
}
// Add default arguments if we do not have enough args to call.
if (declaration->Arguments.size() > ArgumentExpressions.size())
{
for (unsigned int i = ArgumentExpressions.size(); i < declaration->Arguments.size() ; i++)
{
CASTNode* expr = declaration->Arguments.at(i)->AssignmentExpression->Clone(semanter);
AddChild(expr);
ArgumentExpressions.push_back(expr);
expr->Semant(semanter);
}
}
// Cast all arguments to correct data types.
int index = 0;
for (std::vector<CASTNode*>::iterator iter = ArgumentExpressions.begin(); iter != ArgumentExpressions.end(); iter++)
{
CDataType* dataType = declaration->Arguments.at(index++)->Type;
CExpressionBaseASTNode* subnode = dynamic_cast<CExpressionBaseASTNode*>(*iter);
subnode = dynamic_cast<CExpressionBaseASTNode*>(ReplaceChild(subnode, subnode->CastTo(semanter, dataType, Token)));
(*iter) = subnode;
}
// If we are a class reference, we can only access static fields.
bool isClassReference = (dynamic_cast<CClassReferenceDataType*>(left_hand_expr->ExpressionResultType) != NULL);
if (isClassReference == true)
{
if (declaration->IsStatic == false)
{
semanter->GetContext()->FatalError(CStringHelper::FormatString("Cannot access instance method '%s' through class reference '%s'.", declaration->Identifier.c_str(), accessClass->ToString().c_str()), Token);
}
}
// If this is a constructor we are calling, make sure we are in a constructors scope, or its illegal!
else
{
CClassMemberASTNode* methodScope = FindClassMethodScope(semanter);
if (methodScope == NULL ||
methodScope->IsConstructor == false)
{
if (declaration->IsConstructor == true)
{
semanter->GetContext()->FatalError("Calling constructors manually is only valid inside another constructors scope.", Token);
}
}
}
// Resulting type is always our right hand type.
ExpressionResultType = declaration->ReturnType;
return this;
}