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/*******************************************************************************
* Copyright (c) 2010 Wind River Systems, Inc. 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.tm.internal.tcf.debug.actions;
import java.math.BigInteger;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.tm.internal.tcf.debug.model.TCFContextState;
import org.eclipse.tm.internal.tcf.debug.model.TCFLaunch;
import org.eclipse.tm.internal.tcf.debug.model.TCFSourceRef;
import org.eclipse.tm.tcf.protocol.IToken;
import org.eclipse.tm.tcf.protocol.JSON;
import org.eclipse.tm.tcf.protocol.Protocol;
import org.eclipse.tm.tcf.services.ILineNumbers;
import org.eclipse.tm.tcf.services.IRunControl;
import org.eclipse.tm.tcf.services.IRunControl.RunControlContext;
import org.eclipse.tm.tcf.util.TCFDataCache;
public abstract class TCFActionStepInto extends TCFAction implements IRunControl.RunControlListener {
private boolean step_line;
private boolean step_back;
private final IRunControl rc = launch.getService(IRunControl.class);
private IRunControl.RunControlContext ctx;
private TCFDataCache<TCFContextState> state;
private TCFSourceRef source_ref;
private BigInteger pc0;
private BigInteger pc1;
private int step_cnt;
private boolean second_step_back;
private boolean final_step;
protected boolean exited;
public TCFActionStepInto(TCFLaunch launch, IRunControl.RunControlContext ctx, boolean step_line, boolean back_step) {
super(launch, ctx.getID());
this.ctx = ctx;
this.step_line = step_line;
this.step_back = back_step;
}
protected abstract TCFDataCache<TCFContextState> getContextState();
protected abstract TCFDataCache<TCFSourceRef> getLineInfo();
protected abstract TCFDataCache<?> getStackTrace();
public void run() {
if (exited) return;
try {
runAction();
}
catch (Throwable x) {
exit(x);
}
}
private void setSourceRef(TCFSourceRef ref) {
ILineNumbers.CodeArea area = ref.area;
if (area != null) {
pc0 = JSON.toBigInteger(area.start_address);
pc1 = JSON.toBigInteger(area.end_address);
}
else {
pc0 = null;
pc1 = null;
}
source_ref = ref;
}
private void runAction() {
if (aborted) {
exit(null);
return;
}
if (state == null) {
rc.addListener(this);
state = getContextState();
if (state == null) {
exit(new Exception("Invalid context ID"));
return;
}
}
if (!state.validate(this)) return;
if (state.getData() == null || !state.getData().is_suspended) {
Throwable error = state.getError();
if (error == null) error = new Exception("Context is not suspended");
exit(error);
return;
}
if (step_cnt > 0) {
String reason = state.getData().suspend_reason;
if (!IRunControl.REASON_STEP.equals(reason)) {
exit(null, reason);
return;
}
}
int mode = 0;
if (!step_line) mode = step_back ? IRunControl.RM_REVERSE_STEP_INTO : IRunControl.RM_STEP_INTO;
else mode = step_back ? IRunControl.RM_REVERSE_STEP_INTO_LINE : IRunControl.RM_STEP_INTO_LINE;
if (ctx.canResume(mode)) {
if (step_cnt > 0) {
exit(null);
return;
}
ctx.resume(mode, 1, new IRunControl.DoneCommand() {
public void doneCommand(IToken token, Exception error) {
if (error != null) exit(error);
}
});
step_cnt++;
return;
}
if (!step_line) {
exit(new Exception("Step into is not supported"));
return;
}
TCFDataCache<?> stack_trace = getStackTrace();
if (!stack_trace.validate(this)) return;
if (stack_trace.getData() == null) {
exit(stack_trace.getError());
return;
}
if (source_ref == null) {
TCFDataCache<TCFSourceRef> line_info = getLineInfo();
if (!line_info.validate(this)) return;
TCFSourceRef ref = line_info.getData();
if (ref == null) {
step_line = false;
Protocol.invokeLater(this);
return;
}
if (ref.error != null) {
exit(ref.error);
return;
}
setSourceRef(ref);
}
BigInteger pc = new BigInteger(state.getData().suspend_pc);
if (step_cnt > 0) {
if (pc == null || pc0 == null || pc1 == null) {
exit(null);
return;
}
if (pc.compareTo(pc0) < 0 || pc.compareTo(pc1) >= 0) {
TCFDataCache<TCFSourceRef> line_info = getLineInfo();
if (!line_info.validate(this)) return;
TCFSourceRef ref = line_info.getData();
if (ref == null || ref.area == null) {
exit(null);
}
else if (isSameLine(source_ref.area, ref.area)) {
setSourceRef(ref);
}
else if (step_back && !second_step_back) {
// After step back we stop at last instruction of previous line.
// Do second step back into line to skip that line.
second_step_back = true;
setSourceRef(ref);
}
else if (step_back && !final_step) {
// After second step back we have stepped one instruction more then needed.
// Do final step forward to correct that.
final_step = true;
step_back = false;
setSourceRef(ref);
}
else {
exit(null);
return;
}
}
}
step_cnt++;
mode = step_back ? IRunControl.RM_REVERSE_STEP_INTO_RANGE : IRunControl.RM_STEP_INTO_RANGE;
if (ctx.canResume(mode) &&
pc != null && pc0 != null && pc1 != null &&
pc.compareTo(pc0) >= 0 && pc.compareTo(pc1) < 0) {
HashMap<String,Object> args = new HashMap<String,Object>();
args.put(IRunControl.RP_RANGE_START, pc0);
args.put(IRunControl.RP_RANGE_END, pc1);
ctx.resume(mode, 1, args, new IRunControl.DoneCommand() {
public void doneCommand(IToken token, Exception error) {
if (error != null) exit(error);
}
});
return;
}
mode = step_back ? IRunControl.RM_REVERSE_STEP_INTO : IRunControl.RM_STEP_INTO;
if (ctx.canResume(mode)) {
ctx.resume(mode, 1, new IRunControl.DoneCommand() {
public void doneCommand(IToken token, Exception error) {
if (error != null) exit(error);
}
});
return;
}
exit(new Exception("Step into is not supported"));
}
private boolean isSameLine(ILineNumbers.CodeArea x, ILineNumbers.CodeArea y) {
if (x == null || y == null) return false;
if (x.start_line != y.start_line) return false;
if (x.directory != y.directory && (x.directory == null || !x.directory.equals(y.directory))) return false;
if (x.file != y.file && (x.file == null || !x.file.equals(y.file))) return false;
return true;
}
protected void exit(Throwable error) {
exit(error, "Step Into");
}
protected void exit(Throwable error, String reason) {
if (exited) return;
rc.removeListener(this);
exited = true;
if (error == null) setActionResult(getContextID(), reason);
else launch.removeContextActions(getContextID());
done();
}
public void containerResumed(String[] context_ids) {
}
public void containerSuspended(String context, String pc,
String reason, Map<String, Object> params,
String[] suspended_ids) {
for (String id : suspended_ids) {
if (!id.equals(context)) contextSuspended(id, null, null, null);
}
contextSuspended(context, pc, reason, params);
}
public void contextAdded(RunControlContext[] contexts) {
}
public void contextChanged(RunControlContext[] contexts) {
for (RunControlContext c : contexts) {
if (c.getID().equals(ctx.getID())) ctx = c;
}
}
public void contextException(String context, String msg) {
if (context.equals(ctx.getID())) exit(new Exception(msg));
}
public void contextRemoved(String[] context_ids) {
for (String context : context_ids) {
if (context.equals(ctx.getID())) exit(null);
}
}
public void contextResumed(String context) {
}
public void contextSuspended(String context, String pc, String reason, Map<String,Object> params) {
if (!context.equals(ctx.getID())) return;
Protocol.invokeLater(this);
}
}
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