[556] | 1 | /****************************************************************************
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| 2 | **
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[846] | 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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[556] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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| 6 | **
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| 7 | ** This file is part of the QtScript module of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL-ONLY$
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| 10 | ** GNU Lesser General Public License Usage
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| 11 | ** This file may be used under the terms of the GNU Lesser
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| 12 | ** General Public License version 2.1 as published by the Free Software
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| 13 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 14 | ** packaging of this file. Please review the following information to
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| 15 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 16 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 17 | **
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| 18 | ** If you have questions regarding the use of this file, please contact
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| 19 | ** Nokia at qt-info@nokia.com.
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| 20 | ** $QT_END_LICENSE$
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| 21 | **
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| 22 | ****************************************************************************/
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| 23 |
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| 24 | #include "config.h"
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| 25 | #include "qscriptcontext.h"
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| 26 |
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| 27 | #include "qscriptcontext_p.h"
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| 28 | #include "qscriptcontextinfo.h"
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| 29 | #include "qscriptengine.h"
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| 30 | #include "qscriptengine_p.h"
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| 31 | #include "../bridge/qscriptactivationobject_p.h"
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| 32 |
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| 33 | #include "Arguments.h"
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| 34 | #include "CodeBlock.h"
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| 35 | #include "Error.h"
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| 36 | #include "JSFunction.h"
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| 37 | #include "JSObject.h"
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| 38 | #include "JSGlobalObject.h"
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| 39 |
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| 40 | #include <QtCore/qstringlist.h>
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| 41 |
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| 42 | QT_BEGIN_NAMESPACE
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| 43 |
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| 44 | /*!
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| 45 | \since 4.3
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| 46 | \class QScriptContext
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| 47 |
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| 48 | \brief The QScriptContext class represents a Qt Script function invocation.
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| 49 |
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| 50 | \ingroup script
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| 51 | \mainclass
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| 52 |
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| 53 | A QScriptContext provides access to the `this' object and arguments
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| 54 | passed to a script function. You typically want to access this
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| 55 | information when you're writing a native (C++) function (see
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| 56 | QScriptEngine::newFunction()) that will be called from script
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| 57 | code. For example, when the script code
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| 58 |
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| 59 | \snippet doc/src/snippets/code/src_script_qscriptcontext.cpp 0
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| 60 |
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| 61 | is evaluated, a QScriptContext will be created, and the context will
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| 62 | carry the arguments as QScriptValues; in this particular case, the
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| 63 | arguments will be one QScriptValue containing the number 20.5, a second
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| 64 | QScriptValue containing the string \c{"hello"}, and a third QScriptValue
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| 65 | containing a Qt Script object.
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| 66 |
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| 67 | Use argumentCount() to get the number of arguments passed to the
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| 68 | function, and argument() to get an argument at a certain index. The
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| 69 | argumentsObject() function returns a Qt Script array object
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| 70 | containing all the arguments; you can use the QScriptValueIterator
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| 71 | to iterate over its elements, or pass the array on as arguments to
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| 72 | another script function using QScriptValue::call().
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| 73 |
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| 74 | Use thisObject() to get the `this' object associated with the function call,
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| 75 | and setThisObject() to set the `this' object. If you are implementing a
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| 76 | native "instance method", you typically fetch the thisObject() and access
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| 77 | one or more of its properties:
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| 78 |
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| 79 | \snippet doc/src/snippets/code/src_script_qscriptcontext.cpp 1
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| 80 |
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| 81 | Use isCalledAsConstructor() to determine if the function was called
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| 82 | as a constructor (e.g. \c{"new foo()"} (as constructor) or just
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| 83 | \c{"foo()"}). When a function is called as a constructor, the
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| 84 | thisObject() contains the newly constructed object that the function
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| 85 | is expected to initialize.
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| 86 |
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| 87 | Use throwValue() or throwError() to throw an exception.
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| 88 |
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| 89 | Use callee() to obtain the QScriptValue that represents the function being
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| 90 | called. This can for example be used to call the function recursively.
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| 91 |
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| 92 | Use parentContext() to get a pointer to the context that precedes
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| 93 | this context in the activation stack. This is mostly useful for
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| 94 | debugging purposes (e.g. when constructing some form of backtrace).
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| 95 |
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| 96 | The activationObject() function returns the object that is used to
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| 97 | hold the local variables associated with this function call. You can
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| 98 | replace the activation object by calling setActivationObject(). A
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| 99 | typical usage of these functions is when you want script code to be
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| 100 | evaluated in the context of the parent context, e.g. to implement an
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| 101 | include() function:
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| 102 |
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| 103 | \snippet doc/src/snippets/code/src_script_qscriptcontext.cpp 2
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| 104 |
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| 105 | Use backtrace() to get a human-readable backtrace associated with
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| 106 | this context. This can be useful for debugging purposes when
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| 107 | implementing native functions. The toString() function provides a
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| 108 | string representation of the context. (QScriptContextInfo provides
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| 109 | more detailed debugging-related information about the
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| 110 | QScriptContext.)
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| 111 |
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| 112 | Use engine() to obtain a pointer to the QScriptEngine that this context
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| 113 | resides in.
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| 114 |
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| 115 | \sa QScriptContextInfo, QScriptEngine::newFunction(), QScriptable
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| 116 | */
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| 117 |
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| 118 | /*!
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| 119 | \enum QScriptContext::ExecutionState
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| 120 |
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| 121 | This enum specifies the frameution state of the context.
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| 122 |
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| 123 | \value NormalState The context is in a normal state.
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| 124 |
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| 125 | \value ExceptionState The context is in an exceptional state.
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| 126 | */
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| 127 |
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| 128 | /*!
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| 129 | \enum QScriptContext::Error
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| 130 |
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| 131 | This enum specifies types of error.
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| 132 |
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| 133 | \value ReferenceError A reference error.
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| 134 |
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| 135 | \value SyntaxError A syntax error.
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| 136 |
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| 137 | \value TypeError A type error.
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| 138 |
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| 139 | \value RangeError A range error.
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| 140 |
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| 141 | \value URIError A URI error.
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| 142 |
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| 143 | \value UnknownError An unknown error.
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| 144 | */
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| 145 |
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| 146 | /*!
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| 147 | \internal
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| 148 | */
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| 149 | QScriptContext::QScriptContext()
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| 150 | {
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| 151 | //QScriptContext doesn't exist, pointer to QScriptContext are just pointer to JSC::CallFrame
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| 152 | Q_ASSERT(false);
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| 153 | }
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| 154 |
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| 155 | /*!
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| 156 | Throws an exception with the given \a value.
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| 157 | Returns the value thrown (the same as the argument).
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| 158 |
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| 159 | \sa throwError(), state()
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| 160 | */
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| 161 | QScriptValue QScriptContext::throwValue(const QScriptValue &value)
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| 162 | {
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| 163 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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[846] | 164 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 165 | JSC::JSValue jscValue = QScript::scriptEngineFromExec(frame)->scriptValueToJSCValue(value);
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| 166 | frame->setException(jscValue);
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| 167 | return value;
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| 168 | }
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| 169 |
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| 170 | /*!
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| 171 | Throws an \a error with the given \a text.
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| 172 | Returns the created error object.
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| 173 |
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| 174 | The \a text will be stored in the \c{message} property of the error
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| 175 | object.
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| 176 |
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| 177 | The error object will be initialized to contain information about
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| 178 | the location where the error occurred; specifically, it will have
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| 179 | properties \c{lineNumber}, \c{fileName} and \c{stack}. These
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| 180 | properties are described in \l {QtScript Extensions to ECMAScript}.
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| 181 |
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| 182 | \sa throwValue(), state()
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| 183 | */
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| 184 | QScriptValue QScriptContext::throwError(Error error, const QString &text)
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| 185 | {
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| 186 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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[846] | 187 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 188 | JSC::ErrorType jscError = JSC::GeneralError;
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| 189 | switch (error) {
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| 190 | case UnknownError:
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| 191 | break;
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| 192 | case ReferenceError:
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| 193 | jscError = JSC::ReferenceError;
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| 194 | break;
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| 195 | case SyntaxError:
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| 196 | jscError = JSC::SyntaxError;
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| 197 | break;
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| 198 | case TypeError:
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| 199 | jscError = JSC::TypeError;
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| 200 | break;
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| 201 | case RangeError:
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| 202 | jscError = JSC::RangeError;
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| 203 | break;
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| 204 | case URIError:
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| 205 | jscError = JSC::URIError;
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| 206 | break;
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| 207 | }
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| 208 | JSC::JSObject *result = JSC::throwError(frame, jscError, text);
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| 209 | return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
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| 210 | }
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| 211 |
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| 212 | /*!
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| 213 | \overload
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| 214 |
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| 215 | Throws an error with the given \a text.
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| 216 | Returns the created error object.
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| 217 |
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| 218 | \sa throwValue(), state()
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| 219 | */
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| 220 | QScriptValue QScriptContext::throwError(const QString &text)
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| 221 | {
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| 222 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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[846] | 223 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 224 | JSC::JSObject *result = JSC::throwError(frame, JSC::GeneralError, text);
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| 225 | return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
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| 226 | }
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| 227 |
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| 228 | /*!
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| 229 | Destroys this QScriptContext.
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| 230 | */
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| 231 | QScriptContext::~QScriptContext()
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| 232 | {
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| 233 | //QScriptContext doesn't exist, pointer to QScriptContext are just pointer to JSC::CallFrame
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| 234 | Q_ASSERT(false);
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| 235 | }
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| 236 |
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| 237 | /*!
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| 238 | Returns the QScriptEngine that this QScriptContext belongs to.
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| 239 | */
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| 240 | QScriptEngine *QScriptContext::engine() const
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| 241 | {
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| 242 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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| 243 | return QScriptEnginePrivate::get(QScript::scriptEngineFromExec(frame));
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| 244 | }
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| 245 |
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| 246 | /*!
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| 247 | Returns the function argument at the given \a index.
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| 248 |
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| 249 | If \a index >= argumentCount(), a QScriptValue of
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| 250 | the primitive type Undefined is returned.
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| 251 |
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| 252 | \sa argumentCount()
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| 253 | */
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| 254 | QScriptValue QScriptContext::argument(int index) const
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| 255 | {
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| 256 | if (index < 0)
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| 257 | return QScriptValue();
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| 258 | if (index >= argumentCount())
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| 259 | return QScriptValue(QScriptValue::UndefinedValue);
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| 260 | QScriptValue v = argumentsObject().property(index);
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| 261 | return v;
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| 262 | }
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| 263 |
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| 264 | /*!
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| 265 | Returns the callee. The callee is the function object that this
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| 266 | QScriptContext represents an invocation of.
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| 267 | */
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| 268 | QScriptValue QScriptContext::callee() const
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| 269 | {
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| 270 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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[846] | 271 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 272 | return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(frame->callee());
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| 273 | }
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| 274 |
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| 275 | /*!
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| 276 | Returns the arguments object of this QScriptContext.
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| 277 |
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| 278 | The arguments object has properties \c callee (equal to callee())
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| 279 | and \c length (equal to argumentCount()), and properties \c 0, \c 1,
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| 280 | ..., argumentCount() - 1 that provide access to the argument
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| 281 | values. Initially, property \c P (0 <= \c P < argumentCount()) has
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| 282 | the same value as argument(\c P). In the case when \c P is less
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| 283 | than the number of formal parameters of the function, \c P shares
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| 284 | its value with the corresponding property of the activation object
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| 285 | (activationObject()). This means that changing this property changes
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| 286 | the corresponding property of the activation object and vice versa.
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| 287 |
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| 288 | \sa argument(), activationObject()
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| 289 | */
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| 290 | QScriptValue QScriptContext::argumentsObject() const
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| 291 | {
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| 292 | JSC::CallFrame *frame = const_cast<JSC::ExecState*>(QScriptEnginePrivate::frameForContext(this));
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[846] | 293 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 294 |
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| 295 | if (frame == frame->lexicalGlobalObject()->globalExec()) {
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| 296 | // <global> context doesn't have arguments. return an empty object
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| 297 | return QScriptEnginePrivate::get(QScript::scriptEngineFromExec(frame))->newObject();
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| 298 | }
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| 299 |
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| 300 | //for a js function
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| 301 | if (frame->codeBlock() && frame->callee()) {
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[846] | 302 | if (!QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) {
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| 303 | // We have a built-in JS host call.
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| 304 | // codeBlock is needed by retrieveArguments(), but since it
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| 305 | // contains junk, we would crash. Return an invalid value for now.
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| 306 | return QScriptValue();
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| 307 | }
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[556] | 308 | JSC::JSValue result = frame->interpreter()->retrieveArguments(frame, JSC::asFunction(frame->callee()));
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| 309 | return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
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| 310 | }
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| 311 |
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| 312 | if (frame->callerFrame()->hasHostCallFrameFlag()) {
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| 313 | // <eval> context doesn't have arguments. return an empty object
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| 314 | return QScriptEnginePrivate::get(QScript::scriptEngineFromExec(frame))->newObject();
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| 315 | }
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| 316 |
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| 317 | //for a native function
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[846] | 318 | if (!frame->optionalCalleeArguments()
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| 319 | && QScriptEnginePrivate::hasValidCodeBlockRegister(frame)) { // Make sure we don't go here for host JSFunctions
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[556] | 320 | Q_ASSERT(frame->argumentCount() > 0); //we need at least 'this' otherwise we'll crash later
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| 321 | JSC::Arguments* arguments = new (&frame->globalData())JSC::Arguments(frame, JSC::Arguments::NoParameters);
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| 322 | frame->setCalleeArguments(arguments);
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| 323 | }
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| 324 | return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(frame->optionalCalleeArguments());
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| 325 | }
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| 326 |
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| 327 | /*!
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| 328 | Returns true if the function was called as a constructor
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| 329 | (e.g. \c{"new foo()"}); otherwise returns false.
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| 330 |
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| 331 | When a function is called as constructor, the thisObject()
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| 332 | contains the newly constructed object to be initialized.
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[846] | 333 |
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| 334 | \note This function is only guaranteed to work for a context
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| 335 | corresponding to native functions.
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[556] | 336 | */
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| 337 | bool QScriptContext::isCalledAsConstructor() const
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| 338 | {
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| 339 | JSC::CallFrame *frame = const_cast<JSC::ExecState*>(QScriptEnginePrivate::frameForContext(this));
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[846] | 340 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 341 |
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| 342 | //For native functions, look up flags.
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| 343 | uint flags = QScriptEnginePrivate::contextFlags(frame);
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| 344 | if (flags & QScriptEnginePrivate::NativeContext)
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| 345 | return flags & QScriptEnginePrivate::CalledAsConstructorContext;
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| 346 |
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| 347 | //Not a native function, try to look up in the bytecode if we where called from op_construct
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| 348 | JSC::Instruction* returnPC = frame->returnPC();
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| 349 |
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| 350 | if (!returnPC)
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| 351 | return false;
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| 352 |
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| 353 | JSC::CallFrame *callerFrame = QScriptEnginePrivate::frameForContext(parentContext());
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| 354 | if (!callerFrame)
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| 355 | return false;
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| 356 |
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| 357 | if (returnPC[-JSC::op_construct_length].u.opcode == frame->interpreter()->getOpcode(JSC::op_construct)) {
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| 358 | //We are maybe called from the op_construct opcode which has 6 opperands.
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| 359 | //But we need to check we are not called from op_call with 4 opperands
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| 360 |
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| 361 | //we make sure that the returnPC[-1] (thisRegister) is smaller than the returnPC[-3] (registerOffset)
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| 362 | //as if it was an op_call, the returnPC[-1] would be the registerOffset, bigger than returnPC[-3] (funcRegister)
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| 363 | return returnPC[-1].u.operand < returnPC[-3].u.operand;
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| 364 | }
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| 365 | return false;
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| 366 | }
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| 367 |
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| 368 | /*!
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| 369 | Returns the parent context of this QScriptContext.
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| 370 | */
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| 371 | QScriptContext *QScriptContext::parentContext() const
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| 372 | {
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| 373 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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[846] | 374 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
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[556] | 375 | JSC::CallFrame *callerFrame = frame->callerFrame()->removeHostCallFrameFlag();
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| 376 | return QScriptEnginePrivate::contextForFrame(callerFrame);
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| 377 | }
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| 378 |
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| 379 | /*!
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| 380 | Returns the number of arguments passed to the function
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| 381 | in this invocation.
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| 382 |
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| 383 | Note that the argument count can be different from the
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| 384 | formal number of arguments (the \c{length} property of
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| 385 | callee()).
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| 386 |
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| 387 | \sa argument()
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| 388 | */
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| 389 | int QScriptContext::argumentCount() const
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| 390 | {
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| 391 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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| 392 | int argc = frame->argumentCount();
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| 393 | if (argc != 0)
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| 394 | --argc; // -1 due to "this"
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| 395 | return argc;
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| 396 | }
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| 397 |
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| 398 | /*!
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| 399 | \internal
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| 400 | */
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| 401 | QScriptValue QScriptContext::returnValue() const
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| 402 | {
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| 403 | qWarning("QScriptContext::returnValue() not implemented");
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| 404 | return QScriptValue();
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| 405 | }
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| 406 |
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| 407 | /*!
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| 408 | \internal
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| 409 | */
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| 410 | void QScriptContext::setReturnValue(const QScriptValue &result)
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| 411 | {
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| 412 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
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| 413 | JSC::CallFrame *callerFrame = frame->callerFrame();
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| 414 | if (!callerFrame->codeBlock())
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| 415 | return;
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| 416 | Q_ASSERT_X(false, Q_FUNC_INFO, "check me");
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| 417 | int dst = frame->registers()[JSC::RegisterFile::ReturnValueRegister].i(); // returnValueRegister() is private
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| 418 | callerFrame[dst] = QScript::scriptEngineFromExec(frame)->scriptValueToJSCValue(result);
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| 419 | }
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| 420 |
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| 421 | /*!
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| 422 | Returns the activation object of this QScriptContext. The activation
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| 423 | object provides access to the local variables associated with this
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| 424 | context.
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| 425 |
|
---|
[846] | 426 | \note The activation object might not be available if there is no
|
---|
| 427 | active QScriptEngineAgent, as it might be optimized.
|
---|
| 428 |
|
---|
[556] | 429 | \sa argument(), argumentsObject()
|
---|
| 430 | */
|
---|
| 431 |
|
---|
| 432 | QScriptValue QScriptContext::activationObject() const
|
---|
| 433 | {
|
---|
| 434 | JSC::CallFrame *frame = const_cast<JSC::ExecState*>(QScriptEnginePrivate::frameForContext(this));
|
---|
[846] | 435 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
|
---|
[556] | 436 | JSC::JSObject *result = 0;
|
---|
| 437 |
|
---|
| 438 | uint flags = QScriptEnginePrivate::contextFlags(frame);
|
---|
| 439 | if ((flags & QScriptEnginePrivate::NativeContext) && !(flags & QScriptEnginePrivate::HasScopeContext)) {
|
---|
| 440 | //For native functions, lazily create it if needed
|
---|
| 441 | QScript::QScriptActivationObject *scope = new (frame) QScript::QScriptActivationObject(frame);
|
---|
| 442 | frame->setScopeChain(frame->scopeChain()->copy()->push(scope));
|
---|
| 443 | result = scope;
|
---|
| 444 | QScriptEnginePrivate::setContextFlags(frame, flags | QScriptEnginePrivate::HasScopeContext);
|
---|
| 445 | } else {
|
---|
| 446 | // look in scope chain
|
---|
| 447 | JSC::ScopeChainNode *node = frame->scopeChain();
|
---|
| 448 | JSC::ScopeChainIterator it(node);
|
---|
| 449 | for (it = node->begin(); it != node->end(); ++it) {
|
---|
| 450 | if ((*it) && (*it)->isVariableObject()) {
|
---|
| 451 | result = *it;
|
---|
| 452 | break;
|
---|
| 453 | }
|
---|
| 454 | }
|
---|
| 455 | }
|
---|
| 456 | if (!result) {
|
---|
| 457 | if (!parentContext())
|
---|
| 458 | return engine()->globalObject();
|
---|
| 459 |
|
---|
| 460 | qWarning("QScriptContext::activationObject: could not get activation object for frame");
|
---|
| 461 | return QScriptValue();
|
---|
| 462 | /*JSC::CodeBlock *codeBlock = frame->codeBlock();
|
---|
| 463 | if (!codeBlock) {
|
---|
| 464 | // non-Qt native function
|
---|
| 465 | Q_ASSERT(true); //### this should in theorry not happen
|
---|
| 466 | result = new (frame)QScript::QScriptActivationObject(frame);
|
---|
| 467 | } else {
|
---|
| 468 | // ### this is wrong
|
---|
| 469 | JSC::FunctionBodyNode *body = static_cast<JSC::FunctionBodyNode*>(codeBlock->ownerNode());
|
---|
| 470 | result = new (frame)JSC::JSActivation(frame, body);
|
---|
| 471 | }*/
|
---|
| 472 | }
|
---|
| 473 |
|
---|
| 474 | if (result && result->inherits(&QScript::QScriptActivationObject::info)
|
---|
| 475 | && (static_cast<QScript::QScriptActivationObject*>(result)->delegate() != 0)) {
|
---|
| 476 | // Return the object that property access is being delegated to
|
---|
| 477 | result = static_cast<QScript::QScriptActivationObject*>(result)->delegate();
|
---|
| 478 | }
|
---|
| 479 |
|
---|
| 480 | return QScript::scriptEngineFromExec(frame)->scriptValueFromJSCValue(result);
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | /*!
|
---|
| 484 | Sets the activation object of this QScriptContext to be the given \a
|
---|
| 485 | activation.
|
---|
| 486 |
|
---|
| 487 | If \a activation is not an object, this function does nothing.
|
---|
[846] | 488 |
|
---|
| 489 | \note For a context corresponding to a JavaScript function, this is only
|
---|
| 490 | guaranteed to work if there was an QScriptEngineAgent active on the
|
---|
| 491 | engine while the function was evaluated.
|
---|
[556] | 492 | */
|
---|
| 493 | void QScriptContext::setActivationObject(const QScriptValue &activation)
|
---|
| 494 | {
|
---|
| 495 | if (!activation.isObject())
|
---|
| 496 | return;
|
---|
| 497 | else if (activation.engine() != engine()) {
|
---|
| 498 | qWarning("QScriptContext::setActivationObject() failed: "
|
---|
| 499 | "cannot set an object created in "
|
---|
| 500 | "a different engine");
|
---|
| 501 | return;
|
---|
| 502 | }
|
---|
| 503 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
| 504 | QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
|
---|
[846] | 505 | QScript::APIShim shim(engine);
|
---|
[556] | 506 | JSC::JSObject *object = JSC::asObject(engine->scriptValueToJSCValue(activation));
|
---|
| 507 | if (object == engine->originalGlobalObjectProxy)
|
---|
| 508 | object = engine->originalGlobalObject();
|
---|
| 509 |
|
---|
| 510 | uint flags = QScriptEnginePrivate::contextFlags(frame);
|
---|
| 511 | if ((flags & QScriptEnginePrivate::NativeContext) && !(flags & QScriptEnginePrivate::HasScopeContext)) {
|
---|
| 512 | //For native functions, we create a scope node
|
---|
| 513 | JSC::JSObject *scope = object;
|
---|
| 514 | if (!scope->isVariableObject()) {
|
---|
| 515 | // Create a QScriptActivationObject that acts as a proxy
|
---|
| 516 | scope = new (frame) QScript::QScriptActivationObject(frame, scope);
|
---|
| 517 | }
|
---|
| 518 | frame->setScopeChain(frame->scopeChain()->copy()->push(scope));
|
---|
| 519 | QScriptEnginePrivate::setContextFlags(frame, flags | QScriptEnginePrivate::HasScopeContext);
|
---|
| 520 | return;
|
---|
| 521 | }
|
---|
| 522 |
|
---|
| 523 | // else replace the first activation object in the scope chain
|
---|
| 524 | JSC::ScopeChainNode *node = frame->scopeChain();
|
---|
| 525 | while (node != 0) {
|
---|
| 526 | if (node->object && node->object->isVariableObject()) {
|
---|
| 527 | if (!object->isVariableObject()) {
|
---|
| 528 | if (node->object->inherits(&QScript::QScriptActivationObject::info)) {
|
---|
| 529 | static_cast<QScript::QScriptActivationObject*>(node->object)->setDelegate(object);
|
---|
| 530 | } else {
|
---|
| 531 | // Create a QScriptActivationObject that acts as a proxy
|
---|
| 532 | node->object = new (frame) QScript::QScriptActivationObject(frame, object);
|
---|
| 533 | }
|
---|
| 534 | } else {
|
---|
| 535 | node->object = object;
|
---|
| 536 | }
|
---|
| 537 | break;
|
---|
| 538 | }
|
---|
| 539 | node = node->next;
|
---|
| 540 | }
|
---|
| 541 | }
|
---|
| 542 |
|
---|
| 543 | /*!
|
---|
| 544 | Returns the `this' object associated with this QScriptContext.
|
---|
| 545 | */
|
---|
| 546 | QScriptValue QScriptContext::thisObject() const
|
---|
| 547 | {
|
---|
| 548 | JSC::CallFrame *frame = const_cast<JSC::ExecState*>(QScriptEnginePrivate::frameForContext(this));
|
---|
| 549 | QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
|
---|
[846] | 550 | QScript::APIShim shim(engine);
|
---|
[556] | 551 | JSC::JSValue result = engine->thisForContext(frame);
|
---|
| 552 | if (!result || result.isNull())
|
---|
| 553 | result = frame->globalThisValue();
|
---|
| 554 | return engine->scriptValueFromJSCValue(result);
|
---|
| 555 | }
|
---|
| 556 |
|
---|
| 557 | /*!
|
---|
| 558 | Sets the `this' object associated with this QScriptContext to be
|
---|
| 559 | \a thisObject.
|
---|
| 560 |
|
---|
| 561 | If \a thisObject is not an object, this function does nothing.
|
---|
| 562 | */
|
---|
| 563 | void QScriptContext::setThisObject(const QScriptValue &thisObject)
|
---|
| 564 | {
|
---|
| 565 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
[846] | 566 | QScript::APIShim shim(QScript::scriptEngineFromExec(frame));
|
---|
[556] | 567 | if (!thisObject.isObject())
|
---|
| 568 | return;
|
---|
| 569 | if (thisObject.engine() != engine()) {
|
---|
| 570 | qWarning("QScriptContext::setThisObject() failed: "
|
---|
| 571 | "cannot set an object created in "
|
---|
| 572 | "a different engine");
|
---|
| 573 | return;
|
---|
| 574 | }
|
---|
| 575 | if (frame == frame->lexicalGlobalObject()->globalExec()) {
|
---|
| 576 | engine()->setGlobalObject(thisObject);
|
---|
| 577 | return;
|
---|
| 578 | }
|
---|
| 579 | JSC::JSValue jscThisObject = QScript::scriptEngineFromExec(frame)->scriptValueToJSCValue(thisObject);
|
---|
| 580 | JSC::CodeBlock *cb = frame->codeBlock();
|
---|
| 581 | if (cb != 0) {
|
---|
| 582 | frame[cb->thisRegister()] = jscThisObject;
|
---|
| 583 | } else {
|
---|
| 584 | JSC::Register* thisRegister = QScriptEnginePrivate::thisRegisterForFrame(frame);
|
---|
| 585 | thisRegister[0] = jscThisObject;
|
---|
| 586 | }
|
---|
| 587 | }
|
---|
| 588 |
|
---|
| 589 | /*!
|
---|
| 590 | Returns the frameution state of this QScriptContext.
|
---|
| 591 | */
|
---|
| 592 | QScriptContext::ExecutionState QScriptContext::state() const
|
---|
| 593 | {
|
---|
| 594 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
| 595 | if (frame->hadException())
|
---|
| 596 | return QScriptContext::ExceptionState;
|
---|
| 597 | return QScriptContext::NormalState;
|
---|
| 598 | }
|
---|
| 599 |
|
---|
| 600 | /*!
|
---|
| 601 | Returns a human-readable backtrace of this QScriptContext.
|
---|
| 602 |
|
---|
| 603 | Each line is of the form \c{<function-name>(<arguments>)@<file-name>:<line-number>}.
|
---|
| 604 |
|
---|
| 605 | To access individual pieces of debugging-related information (for
|
---|
| 606 | example, to construct your own backtrace representation), use
|
---|
| 607 | QScriptContextInfo.
|
---|
| 608 |
|
---|
| 609 | \sa QScriptEngine::uncaughtExceptionBacktrace(), QScriptContextInfo, toString()
|
---|
| 610 | */
|
---|
| 611 | QStringList QScriptContext::backtrace() const
|
---|
| 612 | {
|
---|
| 613 | QStringList result;
|
---|
| 614 | const QScriptContext *ctx = this;
|
---|
| 615 | while (ctx) {
|
---|
| 616 | result.append(ctx->toString());
|
---|
| 617 | ctx = ctx->parentContext();
|
---|
| 618 | }
|
---|
| 619 | return result;
|
---|
| 620 | }
|
---|
| 621 |
|
---|
| 622 | /*!
|
---|
| 623 | \since 4.4
|
---|
| 624 |
|
---|
| 625 | Returns a string representation of this context.
|
---|
| 626 | This is useful for debugging.
|
---|
| 627 |
|
---|
| 628 | \sa backtrace()
|
---|
| 629 | */
|
---|
| 630 | QString QScriptContext::toString() const
|
---|
| 631 | {
|
---|
| 632 | QScriptContextInfo info(this);
|
---|
| 633 | QString result;
|
---|
| 634 |
|
---|
| 635 | QString functionName = info.functionName();
|
---|
| 636 | if (functionName.isEmpty()) {
|
---|
| 637 | if (parentContext()) {
|
---|
| 638 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
| 639 | if (info.functionType() == QScriptContextInfo::ScriptFunction)
|
---|
| 640 | result.append(QLatin1String("<anonymous>"));
|
---|
| 641 | else if(frame->callerFrame()->hasHostCallFrameFlag())
|
---|
| 642 | result.append(QLatin1String("<eval>"));
|
---|
| 643 | else
|
---|
| 644 | result.append(QLatin1String("<native>"));
|
---|
| 645 | } else {
|
---|
| 646 | result.append(QLatin1String("<global>"));
|
---|
| 647 | }
|
---|
| 648 | } else {
|
---|
| 649 | result.append(functionName);
|
---|
| 650 | }
|
---|
| 651 |
|
---|
| 652 | QStringList parameterNames = info.functionParameterNames();
|
---|
| 653 | result.append(QLatin1Char('('));
|
---|
| 654 | for (int i = 0; i < argumentCount(); ++i) {
|
---|
| 655 | if (i > 0)
|
---|
| 656 | result.append(QLatin1String(", "));
|
---|
| 657 | if (i < parameterNames.count()) {
|
---|
| 658 | result.append(parameterNames.at(i));
|
---|
| 659 | result.append(QLatin1String(" = "));
|
---|
| 660 | }
|
---|
| 661 | QScriptValue arg = argument(i);
|
---|
| 662 | if (arg.isString())
|
---|
| 663 | result.append(QLatin1Char('\''));
|
---|
| 664 | result.append(arg.toString());
|
---|
| 665 | if (arg.isString())
|
---|
| 666 | result.append(QLatin1Char('\''));
|
---|
| 667 |
|
---|
| 668 | }
|
---|
| 669 | result.append(QLatin1Char(')'));
|
---|
| 670 |
|
---|
| 671 | QString fileName = info.fileName();
|
---|
| 672 | int lineNumber = info.lineNumber();
|
---|
| 673 | result.append(QLatin1String(" at "));
|
---|
| 674 | if (!fileName.isEmpty()) {
|
---|
| 675 | result.append(fileName);
|
---|
| 676 | result.append(QLatin1Char(':'));
|
---|
| 677 | }
|
---|
| 678 | result.append(QString::number(lineNumber));
|
---|
| 679 | return result;
|
---|
| 680 | }
|
---|
| 681 |
|
---|
| 682 | /*!
|
---|
| 683 | \internal
|
---|
| 684 | \since 4.5
|
---|
| 685 |
|
---|
| 686 | Returns the scope chain of this QScriptContext.
|
---|
| 687 | */
|
---|
| 688 | QScriptValueList QScriptContext::scopeChain() const
|
---|
| 689 | {
|
---|
| 690 | activationObject(); //ensure the creation of the normal scope for native context
|
---|
| 691 | const JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
| 692 | QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
|
---|
[846] | 693 | QScript::APIShim shim(engine);
|
---|
[556] | 694 | QScriptValueList result;
|
---|
| 695 | JSC::ScopeChainNode *node = frame->scopeChain();
|
---|
| 696 | JSC::ScopeChainIterator it(node);
|
---|
| 697 | for (it = node->begin(); it != node->end(); ++it) {
|
---|
| 698 | JSC::JSObject *object = *it;
|
---|
| 699 | if (!object)
|
---|
| 700 | continue;
|
---|
| 701 | if (object->inherits(&QScript::QScriptActivationObject::info)
|
---|
| 702 | && (static_cast<QScript::QScriptActivationObject*>(object)->delegate() != 0)) {
|
---|
| 703 | // Return the object that property access is being delegated to
|
---|
| 704 | object = static_cast<QScript::QScriptActivationObject*>(object)->delegate();
|
---|
| 705 | }
|
---|
| 706 | result.append(engine->scriptValueFromJSCValue(object));
|
---|
| 707 | }
|
---|
| 708 | return result;
|
---|
| 709 | }
|
---|
| 710 |
|
---|
| 711 | /*!
|
---|
| 712 | \internal
|
---|
| 713 | \since 4.5
|
---|
| 714 |
|
---|
| 715 | Adds the given \a object to the front of this context's scope chain.
|
---|
| 716 |
|
---|
| 717 | If \a object is not an object, this function does nothing.
|
---|
| 718 | */
|
---|
| 719 | void QScriptContext::pushScope(const QScriptValue &object)
|
---|
| 720 | {
|
---|
| 721 | activationObject(); //ensure the creation of the normal scope for native context
|
---|
| 722 | if (!object.isObject())
|
---|
| 723 | return;
|
---|
| 724 | else if (object.engine() != engine()) {
|
---|
| 725 | qWarning("QScriptContext::pushScope() failed: "
|
---|
| 726 | "cannot push an object created in "
|
---|
| 727 | "a different engine");
|
---|
| 728 | return;
|
---|
| 729 | }
|
---|
| 730 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
| 731 | QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
|
---|
[846] | 732 | QScript::APIShim shim(engine);
|
---|
[556] | 733 | JSC::JSObject *jscObject = JSC::asObject(engine->scriptValueToJSCValue(object));
|
---|
| 734 | if (jscObject == engine->originalGlobalObjectProxy)
|
---|
| 735 | jscObject = engine->originalGlobalObject();
|
---|
| 736 | JSC::ScopeChainNode *scope = frame->scopeChain();
|
---|
| 737 | Q_ASSERT(scope != 0);
|
---|
| 738 | if (!scope->object) {
|
---|
| 739 | // pushing to an "empty" chain
|
---|
| 740 | if (!jscObject->isGlobalObject()) {
|
---|
| 741 | qWarning("QScriptContext::pushScope() failed: initial object in scope chain has to be the Global Object");
|
---|
| 742 | return;
|
---|
| 743 | }
|
---|
| 744 | scope->object = jscObject;
|
---|
| 745 | }
|
---|
| 746 | else
|
---|
| 747 | frame->setScopeChain(scope->push(jscObject));
|
---|
| 748 | }
|
---|
| 749 |
|
---|
| 750 | /*!
|
---|
| 751 | \internal
|
---|
| 752 | \since 4.5
|
---|
| 753 |
|
---|
| 754 | Removes the front object from this context's scope chain, and
|
---|
| 755 | returns the removed object.
|
---|
| 756 |
|
---|
| 757 | If the scope chain is already empty, this function returns an
|
---|
| 758 | invalid QScriptValue.
|
---|
| 759 | */
|
---|
| 760 | QScriptValue QScriptContext::popScope()
|
---|
| 761 | {
|
---|
[846] | 762 | activationObject(); //ensure the creation of the normal scope for native context
|
---|
[556] | 763 | JSC::CallFrame *frame = QScriptEnginePrivate::frameForContext(this);
|
---|
| 764 | JSC::ScopeChainNode *scope = frame->scopeChain();
|
---|
| 765 | Q_ASSERT(scope != 0);
|
---|
| 766 | QScriptEnginePrivate *engine = QScript::scriptEngineFromExec(frame);
|
---|
[846] | 767 | QScript::APIShim shim(engine);
|
---|
[556] | 768 | QScriptValue result = engine->scriptValueFromJSCValue(scope->object);
|
---|
| 769 | if (!scope->next) {
|
---|
| 770 | // We cannot have a null scope chain, so just zap the object pointer.
|
---|
| 771 | scope->object = 0;
|
---|
| 772 | } else {
|
---|
| 773 | frame->setScopeChain(scope->pop());
|
---|
| 774 | }
|
---|
| 775 | return result;
|
---|
| 776 | }
|
---|
| 777 |
|
---|
| 778 | QT_END_NAMESPACE
|
---|