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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "config.h"
#include "qscriptcontextinfo.h"
#include "qscriptcontext_p.h"
#include "qscriptengine.h"
#include "qscriptengine_p.h"
#include "../bridge/qscriptqobject_p.h"
#include <QtCore/qdatastream.h>
#include <QtCore/qmetaobject.h>
#include "CodeBlock.h"
#include "JSFunction.h"
#if ENABLE(JIT)
#include "MacroAssemblerCodeRef.h"
#endif
QT_BEGIN_NAMESPACE
/*!
\since 4.4
\class QScriptContextInfo
\brief The QScriptContextInfo class provides additional information about a QScriptContext.
\ingroup script
QScriptContextInfo is typically used for debugging purposes. It can
provide information about the code being executed, such as the type
of the called function, and the original source code location of the
current statement.
If the called function is executing Qt Script code, you can obtain
the script location with the functions fileName(), lineNumber() and
columnNumber().
You can obtain the starting line number and ending line number of a
Qt Script function definition with functionStartLineNumber() and
functionEndLineNumber(), respectively.
For Qt Script functions and Qt methods (e.g. slots), you can call
functionParameterNames() to get the names of the formal parameters of the
function.
For Qt methods and Qt property accessors, you can obtain the index
of the underlying QMetaMethod or QMetaProperty by calling
functionMetaIndex().
\sa QScriptContext, QScriptEngineAgent
*/
/*!
\enum QScriptContextInfo::FunctionType
This enum specifies the type of function being called.
\value ScriptFunction The function is a Qt Script function, i.e. it was defined through a call to QScriptEngine::evaluate().
\value QtFunction The function is a Qt function (a signal, slot or method).
\value QtPropertyFunction The function is a Qt property getter or setter.
\value NativeFunction The function is a built-in Qt Script function, or it was defined through a call to QScriptEngine::newFunction().
*/
class QScriptContextInfoPrivate
{
Q_DECLARE_PUBLIC(QScriptContextInfo)
public:
QScriptContextInfoPrivate();
QScriptContextInfoPrivate(const QScriptContext *context);
~QScriptContextInfoPrivate();
qint64 scriptId;
int lineNumber;
int columnNumber;
QString fileName;
QString functionName;
QScriptContextInfo::FunctionType functionType;
int functionStartLineNumber;
int functionEndLineNumber;
int functionMetaIndex;
QStringList parameterNames;
QBasicAtomicInt ref;
QScriptContextInfo *q_ptr;
};
/*!
\internal
*/
QScriptContextInfoPrivate::QScriptContextInfoPrivate()
{
ref = 0;
functionType = QScriptContextInfo::NativeFunction;
functionMetaIndex = -1;
functionStartLineNumber = -1;
functionEndLineNumber = -1;
scriptId = -1;
lineNumber = -1;
columnNumber = -1;
}
/*!
\internal
*/
QScriptContextInfoPrivate::QScriptContextInfoPrivate(const QScriptContext *context)
{
Q_ASSERT(context);
ref = 0;
functionType = QScriptContextInfo::NativeFunction;
functionMetaIndex = -1;
functionStartLineNumber = -1;
functionEndLineNumber = -1;
scriptId = -1;
lineNumber = -1;
columnNumber = -1;
JSC::CallFrame *frame = const_cast<JSC::CallFrame *>(QScriptEnginePrivate::frameForContext(context));
// Get the line number:
//We need to know the context directly up in the backtrace, in order to get the line number, and adjust the global context
QScriptContext *rewindContext = context->engine()->currentContext();
if (rewindContext != context) { //ignore top context (native function)
// rewind the stack from the top in order to find the frame from the caller where the returnPC is stored
while (rewindContext && rewindContext->parentContext() != context)
rewindContext = rewindContext->parentContext();
if (rewindContext) {
JSC::ExecState *aboveFrame = QScriptEnginePrivate::frameForContext(rewindContext);
frame = aboveFrame->callerFrame()->removeHostCallFrameFlag(); //it will be different for the global context.
JSC::Instruction *returnPC = aboveFrame->returnPC();
JSC::CodeBlock *codeBlock = frame->codeBlock();
if (returnPC && codeBlock) {
#if ENABLE(JIT)
unsigned bytecodeOffset = codeBlock->getBytecodeIndex(frame, JSC::ReturnAddressPtr(returnPC));
#else
unsigned bytecodeOffset = returnPC - codeBlock->instructions().begin();
#endif
bytecodeOffset--; //because returnPC is on the next instruction. We want the current one
lineNumber = codeBlock->lineNumberForBytecodeOffset(const_cast<JSC::ExecState *>(frame), bytecodeOffset);
}
}
} else {
// An agent might have provided the line number.
lineNumber = QScript::scriptEngineFromExec(frame)->agentLineNumber;
}
// Get the filename and the scriptId:
JSC::CodeBlock *codeBlock = frame->codeBlock();
if (codeBlock) {
JSC::SourceProvider *source = codeBlock->source();
scriptId = source->asID();
fileName = source->url();
}
// Get the others informations:
JSC::JSObject *callee = frame->callee();
if (callee && callee->isObject(&JSC::InternalFunction::info))
functionName = JSC::asInternalFunction(callee)->name(&frame->globalData());
if (callee && callee->isObject(&JSC::JSFunction::info)) {
functionType = QScriptContextInfo::ScriptFunction;
JSC::FunctionBodyNode *body = JSC::asFunction(callee)->body();
functionStartLineNumber = body->firstLine();
functionEndLineNumber = body->lastLine();
const JSC::Identifier* params = body->parameters();
for (size_t i = 0; i < body->parameterCount(); ++i)
parameterNames.append(params[i].ustring());
// ### get the function name from the AST
} else if (callee && callee->isObject(&QScript::QtFunction::info)) {
functionType = QScriptContextInfo::QtFunction;
// ### the slot can be overloaded -- need to get the particular overload from the context
functionMetaIndex = static_cast<QScript::QtFunction*>(callee)->initialIndex();
const QMetaObject *meta = static_cast<QScript::QtFunction*>(callee)->metaObject();
if (meta != 0) {
QMetaMethod method = meta->method(functionMetaIndex);
QList<QByteArray> formals = method.parameterNames();
for (int i = 0; i < formals.count(); ++i)
parameterNames.append(QLatin1String(formals.at(i)));
}
}
else if (callee && callee->isObject(&QScript::QtPropertyFunction::info)) {
functionType = QScriptContextInfo::QtPropertyFunction;
functionMetaIndex = static_cast<QScript::QtPropertyFunction*>(callee)->propertyIndex();
}
}
/*!
\internal
*/
QScriptContextInfoPrivate::~QScriptContextInfoPrivate()
{
}
/*!
Constructs a new QScriptContextInfo from the given \a context.
The relevant information is extracted from the \a context at
construction time; i.e. if you continue script execution in the \a
context, the new state of the context will not be reflected in a
previously created QScriptContextInfo.
*/
QScriptContextInfo::QScriptContextInfo(const QScriptContext *context)
: d_ptr(0)
{
if (context) {
d_ptr = new QScriptContextInfoPrivate(context);
d_ptr->q_ptr = this;
}
}
/*!
Constructs a new QScriptContextInfo from the \a other info.
*/
QScriptContextInfo::QScriptContextInfo(const QScriptContextInfo &other)
: d_ptr(other.d_ptr)
{
}
/*!
Constructs a null QScriptContextInfo.
\sa isNull()
*/
QScriptContextInfo::QScriptContextInfo()
: d_ptr(0)
{
}
/*!
Destroys the QScriptContextInfo.
*/
QScriptContextInfo::~QScriptContextInfo()
{
}
/*!
Assigns the \a other info to this QScriptContextInfo,
and returns a reference to this QScriptContextInfo.
*/
QScriptContextInfo &QScriptContextInfo::operator=(const QScriptContextInfo &other)
{
d_ptr = other.d_ptr;
return *this;
}
/*!
Returns the ID of the script where the code being executed was
defined, or -1 if the ID is not available (i.e. a native function is
being executed).
\sa QScriptEngineAgent::scriptLoad()
*/
qint64 QScriptContextInfo::scriptId() const
{
Q_D(const QScriptContextInfo);
if (!d)
return -1;
return d->scriptId;
}
/*!
Returns the name of the file where the code being executed was
defined, if available; otherwise returns an empty string.
For Qt Script code, this function returns the fileName argument
that was passed to QScriptEngine::evaluate().
\sa lineNumber(), functionName()
*/
QString QScriptContextInfo::fileName() const
{
Q_D(const QScriptContextInfo);
if (!d)
return QString();
return d->fileName;
}
/*!
Returns the line number corresponding to the statement being
executed, or -1 if the line number is not available.
The line number is only available if Qt Script code is being
executed.
\sa columnNumber(), fileName()
*/
int QScriptContextInfo::lineNumber() const
{
Q_D(const QScriptContextInfo);
if (!d)
return -1;
return d->lineNumber;
}
/*!
Returns the column number corresponding to the statement being
executed, or -1 if the column number is not available.
The column number is only available if Qt Script code is being
executed.
\sa lineNumber(), fileName()
*/
int QScriptContextInfo::columnNumber() const
{
Q_D(const QScriptContextInfo);
if (!d)
return -1;
return d->columnNumber;
}
/*!
Returns the name of the called function, or an empty string if
the name is not available.
For script functions of type QtPropertyFunction, this function
always returns the name of the property; you can use
QScriptContext::argumentCount() to differentiate between reads and
writes.
\sa fileName(), functionType()
*/
QString QScriptContextInfo::functionName() const
{
Q_D(const QScriptContextInfo);
if (!d)
return QString();
return d->functionName;
}
/*!
Returns the type of the called function.
\sa functionName(), QScriptContext::callee()
*/
QScriptContextInfo::FunctionType QScriptContextInfo::functionType() const
{
Q_D(const QScriptContextInfo);
if (!d)
return NativeFunction;
return d->functionType;
}
/*!
Returns the line number where the definition of the called function
starts, or -1 if the line number is not available.
The starting line number is only available if the functionType() is
ScriptFunction.
\sa functionEndLineNumber(), fileName()
*/
int QScriptContextInfo::functionStartLineNumber() const
{
Q_D(const QScriptContextInfo);
if (!d)
return -1;
return d->functionStartLineNumber;
}
/*!
Returns the line number where the definition of the called function
ends, or -1 if the line number is not available.
The ending line number is only available if the functionType() is
ScriptFunction.
\sa functionStartLineNumber()
*/
int QScriptContextInfo::functionEndLineNumber() const
{
Q_D(const QScriptContextInfo);
if (!d)
return -1;
return d->functionEndLineNumber;
}
/*!
Returns the names of the formal parameters of the called function,
or an empty QStringList if the parameter names are not available.
\sa QScriptContext::argument()
*/
QStringList QScriptContextInfo::functionParameterNames() const
{
Q_D(const QScriptContextInfo);
if (!d)
return QStringList();
return d->parameterNames;
}
/*!
Returns the meta index of the called function, or -1 if the meta
index is not available.
The meta index is only available if the functionType() is QtFunction
or QtPropertyFunction. For QtFunction, the meta index can be passed
to QMetaObject::method() to obtain the corresponding method
definition; for QtPropertyFunction, the meta index can be passed to
QMetaObject::property() to obtain the corresponding property
definition.
\sa QScriptContext::thisObject()
*/
int QScriptContextInfo::functionMetaIndex() const
{
Q_D(const QScriptContextInfo);
if (!d)
return -1;
return d->functionMetaIndex;
}
/*!
Returns true if this QScriptContextInfo is null, i.e. does not
contain any information.
*/
bool QScriptContextInfo::isNull() const
{
Q_D(const QScriptContextInfo);
return (d == 0);
}
/*!
Returns true if this QScriptContextInfo is equal to the \a other
info, otherwise returns false.
*/
bool QScriptContextInfo::operator==(const QScriptContextInfo &other) const
{
Q_D(const QScriptContextInfo);
const QScriptContextInfoPrivate *od = other.d_func();
if (d == od)
return true;
if (!d || !od)
return false;
return ((d->scriptId == od->scriptId)
&& (d->lineNumber == od->lineNumber)
&& (d->columnNumber == od->columnNumber)
&& (d->fileName == od->fileName)
&& (d->functionName == od->functionName)
&& (d->functionType == od->functionType)
&& (d->functionStartLineNumber == od->functionStartLineNumber)
&& (d->functionEndLineNumber == od->functionEndLineNumber)
&& (d->functionMetaIndex == od->functionMetaIndex)
&& (d->parameterNames == od->parameterNames));
}
/*!
Returns true if this QScriptContextInfo is not equal to the \a other
info, otherwise returns false.
*/
bool QScriptContextInfo::operator!=(const QScriptContextInfo &other) const
{
return !(*this == other);
}
#ifndef QT_NO_DATASTREAM
/*!
\fn QDataStream &operator<<(QDataStream &stream, const QScriptContextInfo &info)
\since 4.4
\relates QScriptContextInfo
Writes the given \a info to the specified \a stream.
*/
QDataStream &operator<<(QDataStream &out, const QScriptContextInfo &info)
{
out << info.scriptId();
out << (qint32)info.lineNumber();
out << (qint32)info.columnNumber();
out << (quint32)info.functionType();
out << (qint32)info.functionStartLineNumber();
out << (qint32)info.functionEndLineNumber();
out << (qint32)info.functionMetaIndex();
out << info.fileName();
out << info.functionName();
out << info.functionParameterNames();
return out;
}
/*!
\fn QDataStream &operator>>(QDataStream &stream, QScriptContextInfo &info)
\since 4.4
\relates QScriptContextInfo
Reads a QScriptContextInfo from the specified \a stream into the
given \a info.
*/
Q_SCRIPT_EXPORT QDataStream &operator>>(QDataStream &in, QScriptContextInfo &info)
{
if (!info.d_ptr) {
info.d_ptr = new QScriptContextInfoPrivate();
}
in >> info.d_ptr->scriptId;
qint32 line;
in >> line;
info.d_ptr->lineNumber = line;
qint32 column;
in >> column;
info.d_ptr->columnNumber = column;
quint32 ftype;
in >> ftype;
info.d_ptr->functionType = QScriptContextInfo::FunctionType(ftype);
qint32 startLine;
in >> startLine;
info.d_ptr->functionStartLineNumber = startLine;
qint32 endLine;
in >> endLine;
info.d_ptr->functionEndLineNumber = endLine;
qint32 metaIndex;
in >> metaIndex;
info.d_ptr->functionMetaIndex = metaIndex;
in >> info.d_ptr->fileName;
in >> info.d_ptr->functionName;
in >> info.d_ptr->parameterNames;
return in;
}
#endif
QT_END_NAMESPACE
|