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/* valathrowstatement.vala
*
* Copyright (C) 2007-2010 Jürg Billeter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
/**
* Represents a throw statement in the source code.
*/
public class Vala.ThrowStatement : CodeNode, Statement {
/**
* The error expression to throw.
*/
public Expression error_expression {
get {
return _error_expression;
}
set {
_error_expression = value;
if (_error_expression != null) {
_error_expression.parent_node = this;
}
}
}
private Expression _error_expression;
/**
* Creates a new throw statement.
*
* @param error_expression the error expression
* @param source_reference reference to source code
* @return newly created throw statement
*/
public ThrowStatement (Expression error_expression, SourceReference? source_reference = null) {
this.source_reference = source_reference;
this.error_expression = error_expression;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_throw_statement (this);
}
public override void accept_children (CodeVisitor visitor) {
if (error_expression != null) {
error_expression.accept (visitor);
visitor.visit_end_full_expression (error_expression);
}
}
public override void replace_expression (Expression old_node, Expression new_node) {
if (error_expression == old_node) {
error_expression = new_node;
}
}
public override bool check (CodeContext context) {
if (checked) {
return !error;
}
checked = true;
error_expression.target_type = new ErrorType (null, null, source_reference);
error_expression.target_type.value_owned = true;
if (error_expression != null) {
if (!error_expression.check (context)) {
error = true;
return false;
}
if (error_expression.value_type == null) {
Report.error (error_expression.source_reference, "invalid error expression");
error = true;
return false;
}
if (!(error_expression.value_type is ErrorType)) {
Report.error (error_expression.source_reference, "`%s' is not an error type".printf (error_expression.value_type.to_string ()));
error = true;
return false;
}
}
var error_type = error_expression.value_type.copy ();
error_type.source_reference = source_reference;
add_error_type (error_type);
return !error;
}
public override void emit (CodeGenerator codegen) {
if (error_expression != null) {
error_expression.emit (codegen);
codegen.visit_end_full_expression (error_expression);
}
codegen.visit_throw_statement (this);
}
public override void get_defined_variables (Collection<Variable> collection) {
error_expression.get_defined_variables (collection);
}
public override void get_used_variables (Collection<Variable> collection) {
error_expression.get_used_variables (collection);
}
}
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