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/*******************************************************************************
* Copyright (c) 2007, 2011 Wind River Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.dsf.debug.internal.ui.disassembly;
import org.eclipse.cdt.debug.internal.ui.disassembly.dsf.AddressRangePosition;
import org.eclipse.cdt.debug.internal.ui.disassembly.dsf.DisassemblyPosition;
import org.eclipse.cdt.debug.internal.ui.disassembly.dsf.LabelPosition;
import org.eclipse.cdt.dsf.debug.internal.ui.disassembly.model.DisassemblyDocument;
import org.eclipse.cdt.dsf.internal.ui.DsfUIPlugin;
import org.eclipse.cdt.internal.ui.text.CWordFinder;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.ITextViewer;
/**
* A text hover to evaluate registers and variables under the cursor.
*/
@SuppressWarnings("restriction")
public class DisassemblyTextHover implements ITextHover {
private final DisassemblyPart fDisassemblyPart;
/**
* Create a new disassembly text hover.
*/
public DisassemblyTextHover(DisassemblyPart part) {
fDisassemblyPart= part;
}
/* (non-Javadoc)
* @see org.eclipse.jface.text.ITextHover#getHoverRegion(org.eclipse.jface.text.ITextViewer, int)
*/
public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
IDocument doc = textViewer.getDocument();
return CWordFinder.findWord(doc, offset);
}
/* (non-Javadoc)
* @see org.eclipse.jface.text.ITextHover#getHoverInfo(org.eclipse.jface.text.ITextViewer, org.eclipse.jface.text.IRegion)
*/
public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
DisassemblyDocument doc = (DisassemblyDocument)textViewer.getDocument();
int offset = hoverRegion.getOffset();
AddressRangePosition pos;
try {
String ident = doc.get(offset, hoverRegion.getLength());
String value = null;
pos = doc.getModelPosition(offset);
value = fDisassemblyPart.getHoverInfoData(pos, ident);
// If returns null (or empty string), not implemented or something went wrong.
if (value == null || value.length() == 0) {
if (pos instanceof SourcePosition) {
value = evaluateExpression(ident);
} else if (pos instanceof LabelPosition) {
value = evaluateExpression(ident);
} else if (pos instanceof DisassemblyPosition) {
// first, try to evaluate as register
value = evaluateRegister(ident);
if (value == null) {
// if this fails, try expression
value = evaluateExpression(ident);
}
}
if (value != null) {
return ident + " = " + value; //$NON-NLS-1$
}
}
else
return value;
} catch (BadLocationException e) {
if (DsfUIPlugin.getDefault().isDebugging()) {
DsfUIPlugin.getDefault().getLog().log(new Status(IStatus.ERROR, DsfUIPlugin.PLUGIN_ID, "Internal Error", e)); //$NON-NLS-1$
}
}
return null;
}
/**
* Evaluate the given register.
* @param register
* @return register value or <code>null</code>
*/
private String evaluateRegister(String register) {
return fDisassemblyPart.evaluateRegister(register);
}
/**
* Evaluate the given expression.
* @param expr
* @return expression value or <code>null</code>
*/
private String evaluateExpression(final String expr) {
return fDisassemblyPart.evaluateExpression(expr);
}
}
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