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authorKent Hansen <kent.hansen@nokia.com>2010-02-04 14:40:29 (GMT)
committerKent Hansen <kent.hansen@nokia.com>2010-02-04 14:54:28 (GMT)
commit17ba81e9587f3202363b42f6662a2866506e9247 (patch)
tree9014a42b7a3f96d3d21b81830bf9539f6a338549 /src/scripttools/debugging
parent79766609a5c988174599882a9f3124f3fa8dfc1c (diff)
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Fix QtScript debugger hang/crash issue with updating locals model
Since the model is updated lazily, it's possible that a new model has been set on the view (and the old model deleted) before the old model has finished refreshing. This was discovered while holding down the F11 key (Step Into) when debugging plasma.js in the script/context2d example, which causes many events (and hence asynchronous model updates) to trigger rapidly.
Diffstat (limited to 'src/scripttools/debugging')
-rw-r--r--src/scripttools/debugging/qscriptdebuggerlocalsmodel.cpp55
-rw-r--r--src/scripttools/debugging/qscriptdebuggerlocalswidget.cpp5
2 files changed, 44 insertions, 16 deletions
diff --git a/src/scripttools/debugging/qscriptdebuggerlocalsmodel.cpp b/src/scripttools/debugging/qscriptdebuggerlocalsmodel.cpp
index 068de42..ec6230b 100644
--- a/src/scripttools/debugging/qscriptdebuggerlocalsmodel.cpp
+++ b/src/scripttools/debugging/qscriptdebuggerlocalsmodel.cpp
@@ -54,6 +54,7 @@
#include <QtCore/qdebug.h>
#include <QtCore/qcoreapplication.h>
+#include <QtCore/qpointer.h>
#include <QtGui/qbrush.h>
#include <QtGui/qfont.h>
@@ -370,6 +371,7 @@ public:
{
if (!m_index.isValid()) {
// nothing to do, the node has been removed
+ finish();
return;
}
QScriptDebuggerCommandSchedulerFrontend frontend(commandScheduler(), this);
@@ -475,7 +477,7 @@ namespace {
class InitModelJob : public QScriptDebuggerCommandSchedulerJob
{
public:
- InitModelJob(QScriptDebuggerLocalsModelPrivate *model,
+ InitModelJob(QScriptDebuggerLocalsModel *model,
int frameIndex,
QScriptDebuggerCommandSchedulerInterface *scheduler)
: QScriptDebuggerCommandSchedulerJob(scheduler),
@@ -484,6 +486,11 @@ public:
void start()
{
+ if (!m_model) {
+ // Model has been deleted.
+ finish();
+ return;
+ }
QScriptDebuggerCommandSchedulerFrontend frontend(commandScheduler(), this);
frontend.scheduleGetScopeChain(m_frameIndex);
}
@@ -491,7 +498,13 @@ public:
void handleResponse(const QScriptDebuggerResponse &response,
int)
{
+ if (!m_model) {
+ // Model has been deleted.
+ finish();
+ return;
+ }
QScriptDebuggerCommandSchedulerFrontend frontend(commandScheduler(), this);
+ QScriptDebuggerLocalsModelPrivate *model_d = QScriptDebuggerLocalsModelPrivate::get(m_model);
switch (m_state) {
case 0: {
QScriptDebuggerValueList scopeChain = response.resultAsScriptValueList();
@@ -500,23 +513,23 @@ public:
QString name = QString::fromLatin1("Scope");
if (i > 0)
name.append(QString::fromLatin1(" (%0)").arg(i));
- QModelIndex index = m_model->addTopLevelObject(name, scopeObject);
+ QModelIndex index = model_d->addTopLevelObject(name, scopeObject);
if (i == 0)
- m_model->emitScopeObjectAvailable(index);
+ model_d->emitScopeObjectAvailable(index);
}
frontend.scheduleGetThisObject(m_frameIndex);
++m_state;
} break;
case 1: {
QScriptDebuggerValue thisObject = response.resultAsScriptValue();
- m_model->addTopLevelObject(QLatin1String("this"), thisObject);
+ model_d->addTopLevelObject(QLatin1String("this"), thisObject);
finish();
} break;
}
}
private:
- QScriptDebuggerLocalsModelPrivate *m_model;
+ QPointer<QScriptDebuggerLocalsModel> m_model;
int m_frameIndex;
int m_state;
};
@@ -527,7 +540,7 @@ void QScriptDebuggerLocalsModel::init(int frameIndex)
{
Q_D(QScriptDebuggerLocalsModel);
d->frameIndex = frameIndex;
- QScriptDebuggerJob *job = new InitModelJob(d, frameIndex, d->commandScheduler);
+ QScriptDebuggerJob *job = new InitModelJob(this, frameIndex, d->commandScheduler);
d->jobScheduler->scheduleJob(job);
}
@@ -536,7 +549,7 @@ namespace {
class SyncModelJob : public QScriptDebuggerCommandSchedulerJob
{
public:
- SyncModelJob(QScriptDebuggerLocalsModelPrivate *model,
+ SyncModelJob(QScriptDebuggerLocalsModel *model,
int frameIndex,
QScriptDebuggerCommandSchedulerInterface *scheduler)
: QScriptDebuggerCommandSchedulerJob(scheduler),
@@ -545,6 +558,11 @@ public:
void start()
{
+ if (!m_model) {
+ // Model has been deleted.
+ finish();
+ return;
+ }
QScriptDebuggerCommandSchedulerFrontend frontend(commandScheduler(), this);
frontend.scheduleGetScopeChain(m_frameIndex);
}
@@ -552,6 +570,11 @@ public:
void handleResponse(const QScriptDebuggerResponse &response,
int)
{
+ if (!m_model) {
+ // Model has been deleted.
+ finish();
+ return;
+ }
QScriptDebuggerCommandSchedulerFrontend frontend(commandScheduler(), this);
switch (m_state) {
case 0: {
@@ -561,18 +584,19 @@ public:
++m_state;
} break;
case 1: {
+ QScriptDebuggerLocalsModelPrivate *model_d = QScriptDebuggerLocalsModelPrivate::get(m_model);
QScriptDebuggerValue thisObject = response.resultAsScriptValue();
m_topLevelObjects.append(thisObject);
- bool equal = (m_topLevelObjects.size() == m_model->invisibleRootNode->children.size());
+ bool equal = (m_topLevelObjects.size() == model_d->invisibleRootNode->children.size());
for (int i = 0; equal && (i < m_topLevelObjects.size()); ++i) {
const QScriptDebuggerValue &object = m_topLevelObjects.at(i);
- equal = (object == m_model->invisibleRootNode->children.at(i)->property.value());
+ equal = (object == model_d->invisibleRootNode->children.at(i)->property.value());
}
if (!equal) {
// the scope chain and/or this-object changed, so invalidate the model.
// we could try to be more clever, i.e. figure out
// exactly which objects were popped/pushed
- m_model->removeTopLevelNodes();
+ model_d->removeTopLevelNodes();
for (int j = 0; j < m_topLevelObjects.size(); ++j) {
const QScriptDebuggerValue &object = m_topLevelObjects.at(j);
QString name;
@@ -583,12 +607,12 @@ public:
if (j > 0)
name.append(QString::fromLatin1(" (%0)").arg(j));
}
- QModelIndex index = m_model->addTopLevelObject(name, object);
+ QModelIndex index = model_d->addTopLevelObject(name, object);
if (j == 0)
- m_model->emitScopeObjectAvailable(index);
+ model_d->emitScopeObjectAvailable(index);
}
} else {
- m_model->syncTopLevelNodes();
+ model_d->syncTopLevelNodes();
}
finish();
} break;
@@ -596,7 +620,7 @@ public:
}
private:
- QScriptDebuggerLocalsModelPrivate *m_model;
+ QPointer<QScriptDebuggerLocalsModel> m_model;
int m_frameIndex;
int m_state;
QScriptDebuggerValueList m_topLevelObjects;
@@ -608,7 +632,7 @@ void QScriptDebuggerLocalsModel::sync(int frameIndex)
{
Q_D(QScriptDebuggerLocalsModel);
d->frameIndex = frameIndex;
- QScriptDebuggerJob *job = new SyncModelJob(d, frameIndex, d->commandScheduler);
+ QScriptDebuggerJob *job = new SyncModelJob(this, frameIndex, d->commandScheduler);
d->jobScheduler->scheduleJob(job);
}
@@ -636,6 +660,7 @@ public:
{
if (!m_index.isValid()) {
// nothing to do, the node has been removed
+ finish();
return;
}
QScriptDebuggerCommandSchedulerFrontend frontend(commandScheduler(), this);
diff --git a/src/scripttools/debugging/qscriptdebuggerlocalswidget.cpp b/src/scripttools/debugging/qscriptdebuggerlocalswidget.cpp
index 516a200..bbced5f 100644
--- a/src/scripttools/debugging/qscriptdebuggerlocalswidget.cpp
+++ b/src/scripttools/debugging/qscriptdebuggerlocalswidget.cpp
@@ -70,6 +70,8 @@ public:
bool hasChildren(const QModelIndex &parent) const
{
+ if (!sourceModel())
+ return false;
QModelIndex sourceParent = mapToSource(parent);
if (parent.isValid() && !sourceParent.isValid())
return false;
@@ -184,7 +186,8 @@ void QScriptDebuggerLocalsWidgetPrivate::_q_insertCompletion(const QString &text
void QScriptDebuggerLocalsWidgetPrivate::_q_expandIndex(const QModelIndex &index)
{
- view->expand(proxy->mapFromSource(index));
+ if (view->model() == index.model())
+ view->expand(proxy->mapFromSource(index));
}
class QScriptDebuggerLocalsItemDelegate