OoasTools

/**

  *

  *                      OOAS Compiler

  *

  *       Copyright 2015, AIT Austrian Institute of Technology.

  * This code is based on the C# Version of the OOAS Compiler, which is

  * copyright 2015 by the Institute of Software Technology, Graz University

  * of Technology with portions copyright by the AIT Austrian Institute of

  * Technology. All rights reserved.

  *

  * SEE THE "LICENSE" FILE FOR THE TERMS UNDER WHICH THIS FILE IS PROVIDED.

  *

  * If you modify the file please update the list of contributors below to in-

  * clude your name. Please also stick to the coding convention of using TABs

  * to do the basic (block-level) indentation and spaces for anything after

  * that. (Enable the display of special chars and it should be pretty obvious

  * what this means.) Also, remove all trailing whitespace.

  *

  * Contributors:

  *               Willibald Krenn (AIT)

  *               Stephan Zimmerer (AIT)

  *               Markus Demetz (AIT)

  *               Christoph Czurda (AIT)

  *

  */

package org.momut.ooas.visitors.analysis;

import java.util.HashMap;

import org.momut.ooas.utils.exceptions.InternalCompilerException;

public final class OoaCheckASTVisitor extends OoaCompleteAstTraversalVisitor {

	private final String m_tag;

	private final HashMap<String,UlyssesType> m_seenTypes = new HashMap<>();

	@Override

	protected void VisitAstElement(IAst element, IAst parent) {

		if (element instanceof UlyssesType) {

			final UlyssesType t = (element instanceof OpaqueType) ? ((OpaqueType) element).resolvedType()  : (UlyssesType) element;

			if (t != null) { // opaque might not have resolve yet..

				final String typeStr = t.toString();

				if (m_seenTypes.containsKey(typeStr)) {

					if (!t.isAnonymousType() &&

					    m_seenTypes.get(typeStr) != t) // ref eq

					{

						throw new InternalCompilerException(String.format("Internal Error (%s): AST structure error."

								+ " Type instantiated multiple times: %s", m_tag, typeStr));

					}

				} else

					m_seenTypes.put(typeStr, t);

			}

		}

		super.VisitAstElement(element, parent);

	}

	@Override

	public void visit(NondetBlock nondetBlock) {

		super.visit(nondetBlock);

		checkScope(nondetBlock);

	}

	@Override

	public void visit(PrioBlock prioBlock) {

		super.visit(prioBlock);

		checkScope(prioBlock);

	}

	@Override

	public void visit(SeqBlock seqBlock) {

		super.visit(seqBlock);

		checkScope(seqBlock);

	}

	private final void checkScope(Block aBlock) {

		for (final Statement element: aBlock.statements())

			if (element instanceof IScope) {

				final IScope child = (IScope) element;

				if (child.GetParentScope() != aBlock)

					throw new InternalCompilerException("Internal Error (%s): AST structure error. ", m_tag);

			}

	}

	public OoaCheckASTVisitor(ParserState aState, String tag) {

		super(aState);

		m_tag = tag;

	}

}