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C++ editor: Fix potential crash in completion

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There was still a problem in the previous change (that's
why it was reverted) which should be fixed now.

Task-number: QTCREATORBUG-4940
Change-Id: I8a0d993b9f313fc98494cf93fed1f87939a358b1
Reviewed-on: http://codereview.qt.nokia.com/27
Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>
This commit is contained in:
Leandro Melo
2011-05-19 18:02:09 +02:00
committed by Leandro T. C. Melo
parent c86e81c362
commit 956bac297b
2 changed files with 44 additions and 25 deletions
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68
src/plugins/cpptools/cppcompletionassist.cpp
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@@ -184,7 +184,9 @@ public:
, m_sortable(false)
, m_completionOperator(T_EOF_SYMBOL)
, m_replaceDotForArrow(false)
, m_typeOfExpression(new TypeOfExpression)
{}
virtual ~CppAssistProposalModel();
virtual bool isSortable() const { return m_sortable; }
virtual IAssistProposalItem *proposalItem(int index) const;
@@ -192,16 +194,23 @@ public:
bool m_sortable;
unsigned m_completionOperator;
bool m_replaceDotForArrow;
Snapshot m_snapshot;
mutable TypeOfExpression *m_typeOfExpression;
};
CppAssistProposalModel::~CppAssistProposalModel()
{
delete m_typeOfExpression;
}
// ---------------------
// CppAssistProposalItem
// ---------------------
class CppAssistProposalItem : public TextEditor::BasicProposalItem
{
public:
CppAssistProposalItem() : m_isOverloaded(false) {}
CppAssistProposalItem() :
m_isOverloaded(false), m_typeOfExpression(0) {}
virtual ~CppAssistProposalItem();
virtual bool prematurelyApplies(const QChar &c) const;
virtual void applyContextualContent(TextEditor::BaseTextEditor *editor,
@@ -210,15 +219,21 @@ public:
bool isOverloaded() const { return m_isOverloaded; }
void markAsOverloaded() { m_isOverloaded = true; }
void keepCompletionOperator(unsigned compOp) { m_completionOperator = compOp; }
void keepSnapshot(const Snapshot &snapshot) { m_snapshot = snapshot; }
void ownTypeOfExpression(TypeOfExpression *typeOfExp) { m_typeOfExpression = typeOfExp; }
private:
bool m_isOverloaded;
unsigned m_completionOperator;
mutable QChar m_typedChar;
Snapshot m_snapshot;
TypeOfExpression *m_typeOfExpression;
};
CppAssistProposalItem::~CppAssistProposalItem()
{
if (m_typeOfExpression)
delete m_typeOfExpression;
}
} // Internal
} // CppTools
@@ -231,7 +246,8 @@ IAssistProposalItem *CppAssistProposalModel::proposalItem(int index) const
if (!item->data().canConvert<QString>()) {
CppAssistProposalItem *cppItem = static_cast<CppAssistProposalItem *>(item);
cppItem->keepCompletionOperator(m_completionOperator);
cppItem->keepSnapshot(m_snapshot);
cppItem->ownTypeOfExpression(m_typeOfExpression);
m_typeOfExpression = 0;
}
return item;
}
@@ -413,9 +429,10 @@ void CppAssistProposalItem::applyContextualContent(TextEditor::BaseTextEditor *e
class CppFunctionHintModel : public TextEditor::IFunctionHintProposalModel
{
public:
CppFunctionHintModel(QList<Function *> functionSymbols)
CppFunctionHintModel(QList<Function *> functionSymbols, TypeOfExpression *typeOfExp)
: m_functionSymbols(functionSymbols)
, m_currentArg(-1)
, m_typeOfExpression(typeOfExp)
{}
virtual void reset() {}
@@ -426,6 +443,7 @@ public:
private:
QList<Function *> m_functionSymbols;
mutable int m_currentArg;
TypeOfExpression *m_typeOfExpression;
};
QString CppFunctionHintModel::text(int index) const
@@ -675,8 +693,6 @@ IAssistProposal * CppCompletionAssistProcessor::perform(const IAssistInterface *
if (interface->reason() != ExplicitlyInvoked && !accepts())
return 0;
m_model->m_snapshot = m_interface->snapshot();
int index = startCompletionHelper();
if (index != -1) {
if (m_hintProposal)
@@ -804,7 +820,9 @@ IAssistProposal *CppCompletionAssistProcessor::createContentProposal()
IAssistProposal *CppCompletionAssistProcessor::createHintProposal(
QList<CPlusPlus::Function *> functionSymbols) const
{
IFunctionHintProposalModel *model = new CppFunctionHintModel(functionSymbols);
IFunctionHintProposalModel *model =
new CppFunctionHintModel(functionSymbols, m_model->m_typeOfExpression);
m_model->m_typeOfExpression = 0;
IAssistProposal *proposal = new FunctionHintProposal(m_startPosition, model);
return proposal;
}
@@ -1043,19 +1061,20 @@ bool CppCompletionAssistProcessor::tryObjCCompletion()
const int startPos = tokens[start].begin() + tokens.startPosition();
const QString expr = m_interface->textAt(startPos, m_interface->position() - startPos);
Document::Ptr thisDocument = m_model->m_snapshot.document(m_interface->file()->fileName());
Document::Ptr thisDocument = m_interface->snapshot().document(m_interface->file()->fileName());
if (! thisDocument)
return false;
typeOfExpression.init(thisDocument, m_model->m_snapshot);
m_model->m_typeOfExpression->init(thisDocument, m_interface->snapshot());
int line = 0, column = 0;
Convenience::convertPosition(m_interface->document(), m_interface->position(), &line, &column);
Scope *scope = thisDocument->scopeAt(line, column);
if (!scope)
return false;
const QList<LookupItem> items = typeOfExpression(expr, scope);
LookupContext lookupContext(thisDocument, m_model->m_snapshot);
const QList<LookupItem> items = (*m_model->m_typeOfExpression)(expr, scope);
LookupContext lookupContext(thisDocument, m_interface->snapshot());
foreach (const LookupItem &item, items) {
FullySpecifiedType ty = item.type().simplified();
@@ -1246,18 +1265,18 @@ int CppCompletionAssistProcessor::startCompletionInternal(const QString fileName
{
QString expression = expr.trimmed();
Document::Ptr thisDocument = m_model->m_snapshot.document(fileName);
Document::Ptr thisDocument = m_interface->snapshot().document(fileName);
if (! thisDocument)
return -1;
typeOfExpression.init(thisDocument, m_model->m_snapshot);
m_model->m_typeOfExpression->init(thisDocument, m_interface->snapshot());
Scope *scope = thisDocument->scopeAt(line, column);
Q_ASSERT(scope != 0);
if (expression.isEmpty()) {
if (m_model->m_completionOperator == T_EOF_SYMBOL || m_model->m_completionOperator == T_COLON_COLON) {
(void) typeOfExpression(expression, scope);
(void) (*m_model->m_typeOfExpression)(expression, scope);
globalCompletion(scope);
if (m_completions.isEmpty())
return -1;
@@ -1270,13 +1289,14 @@ int CppCompletionAssistProcessor::startCompletionInternal(const QString fileName
}
}
QList<LookupItem> results = typeOfExpression(expression, scope, TypeOfExpression::Preprocess);
QList<LookupItem> results =
(*m_model->m_typeOfExpression)(expression, scope, TypeOfExpression::Preprocess);
if (results.isEmpty()) {
if (m_model->m_completionOperator == T_SIGNAL || m_model->m_completionOperator == T_SLOT) {
if (! (expression.isEmpty() || expression == QLatin1String("this"))) {
expression = QLatin1String("this");
results = typeOfExpression(expression, scope);
results = (*m_model->m_typeOfExpression)(expression, scope);
}
if (results.isEmpty())
@@ -1297,7 +1317,7 @@ int CppCompletionAssistProcessor::startCompletionInternal(const QString fileName
// Resolve the type of this expression
const QList<LookupItem> results =
typeOfExpression(baseExpression, scope,
(*m_model->m_typeOfExpression)(baseExpression, scope,
TypeOfExpression::Preprocess);
// If it's a class, add completions for the constructors
@@ -1355,7 +1375,7 @@ int CppCompletionAssistProcessor::startCompletionInternal(const QString fileName
void CppCompletionAssistProcessor::globalCompletion(CPlusPlus::Scope *currentScope)
{
const LookupContext &context = typeOfExpression.context();
const LookupContext &context = m_model->m_typeOfExpression->context();
if (m_model->m_completionOperator == T_COLON_COLON) {
completeNamespace(context.globalNamespace());
@@ -1422,7 +1442,7 @@ void CppCompletionAssistProcessor::globalCompletion(CPlusPlus::Scope *currentSco
bool CppCompletionAssistProcessor::completeMember(const QList<CPlusPlus::LookupItem> &baseResults)
{
const LookupContext &context = typeOfExpression.context();
const LookupContext &context = m_model->m_typeOfExpression->context();
if (baseResults.isEmpty())
return false;
@@ -1444,7 +1464,7 @@ bool CppCompletionAssistProcessor::completeMember(const QList<CPlusPlus::LookupI
bool CppCompletionAssistProcessor::completeScope(const QList<CPlusPlus::LookupItem> &results)
{
const LookupContext &context = typeOfExpression.context();
const LookupContext &context = m_model->m_typeOfExpression->context();
if (results.isEmpty())
return false;
@@ -1574,7 +1594,7 @@ bool CppCompletionAssistProcessor::completeQtMethod(const QList<CPlusPlus::Looku
if (results.isEmpty())
return false;
const LookupContext &context = typeOfExpression.context();
const LookupContext &context = m_model->m_typeOfExpression->context();
ConvertToCompletionItem toCompletionItem;
Overview o;
@@ -1727,7 +1747,7 @@ bool CppCompletionAssistProcessor::completeConstructorOrFunction(const QList<CPl
int endOfExpression,
bool toolTipOnly)
{
const LookupContext &context = typeOfExpression.context();
const LookupContext &context = m_model->m_typeOfExpression->context();
QList<Function *> functions;
foreach (const LookupItem &result, results) {