1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation ([email protected])
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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 [email protected].
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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 "qscriptengineagent.h"
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26 | #include "qscriptengineagent_p.h"
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27 | #include "qscriptengine.h"
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28 | #include "qscriptengine_p.h"
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29 |
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30 | #include "CodeBlock.h"
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31 | #include "Instruction.h"
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32 |
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33 | QT_BEGIN_NAMESPACE
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34 |
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35 | /*!
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36 | \since 4.4
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37 | \class QScriptEngineAgent
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38 |
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39 | \brief The QScriptEngineAgent class provides an interface to report events pertaining to QScriptEngine execution.
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40 |
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41 | \ingroup script
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42 |
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43 |
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44 | The QScriptEngineAgent class is the basis of tools that monitor and/or control the execution of a
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45 | QScriptEngine, such as debuggers and profilers.
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46 |
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47 | To process script loading and unloading events, reimplement the
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48 | scriptLoad() and scriptUnload() functions. scriptLoad() is called
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49 | after the input to QScriptEngine::evaluate() has been parsed, right
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50 | before the given script is executed. The engine assigns each
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51 | script an ID, which is available as one of the arguments to
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52 | scriptLoad(); subsequently, other event handlers can use the ID to
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53 | identify a particular script. One common usage of scriptLoad() is
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54 | to retain the script text, filename and base line number (the
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55 | original input to QScriptEngine::evaluate()), so that other event
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56 | handlers can e.g. map a line number to the corresponding line of
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57 | text.
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58 |
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59 | scriptUnload() is called when the QScriptEngine has no further use
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60 | for a script; the QScriptEngineAgent may at this point safely
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61 | discard any resources associated with the script (such as the
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62 | script text). Note that after scriptUnload() has been called, the
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63 | QScriptEngine may reuse the relevant script ID for new scripts
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64 | (i.e. as argument to a subsequent call to scriptLoad()).
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65 |
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66 | Evaluating the following script will result in scriptUnload()
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67 | being called immediately after evaluation has completed:
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68 |
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69 | \snippet doc/src/snippets/code/src_script_qscriptengineagent.cpp 0
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70 |
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71 | Evaluating the following script will \b{not} result in a call to
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72 | scriptUnload() when evaluation has completed:
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73 |
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74 | \snippet doc/src/snippets/code/src_script_qscriptengineagent.cpp 1
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75 |
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76 | The script isn't unloaded because it defines a function (\c{cube})
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77 | that remains in the script environment after evaluation has
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78 | completed. If a subsequent script removed the \c{cube} function
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79 | (e.g. by setting it to \c{null}), scriptUnload() would be called
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80 | when the function is garbage collected. In general terms, a script
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81 | isn't unloaded until the engine has determined that none of its
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82 | contents is referenced.
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83 |
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84 | To process script function calls and returns, reimplement the
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85 | functionEntry() and functionExit() functions. functionEntry() is
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86 | called when a script function is about to be executed;
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87 | functionExit() is called when a script function is about to return,
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88 | either normally or due to an exception.
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89 |
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90 | To process individual script statements, reimplement
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91 | positionChange(). positionChange() is called each time the engine is
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92 | about to execute a new statement of a script, and thus offers the
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93 | finest level of script monitoring.
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94 |
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95 | To process exceptions, reimplement exceptionThrow() and
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96 | exceptionCatch(). exceptionThrow() is called when a script exception
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97 | is thrown, before it has been handled. exceptionCatch() is called
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98 | when an exception handler is present, and execution is about to be
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99 | resumed at the handler code.
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100 |
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101 | \sa QScriptEngine::setAgent(), QScriptContextInfo
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102 | */
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103 |
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104 | /*!
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105 | \enum QScriptEngineAgent::Extension
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106 |
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107 | This enum specifies the possible extensions to a QScriptEngineAgent.
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108 |
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109 | \value DebuggerInvocationRequest The agent handles \c{debugger} script statements.
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110 |
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111 | \sa extension()
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112 | */
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113 |
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114 |
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115 | void QScriptEngineAgentPrivate::attach()
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116 | {
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117 | if (engine->originalGlobalObject()->debugger())
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118 | engine->originalGlobalObject()->setDebugger(0);
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119 | JSC::Debugger::attach(engine->originalGlobalObject());
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120 | }
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121 |
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122 | void QScriptEngineAgentPrivate::detach()
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123 | {
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124 | JSC::Debugger::detach(engine->originalGlobalObject());
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125 | }
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126 |
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127 | void QScriptEngineAgentPrivate::returnEvent(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno)
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128 | {
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129 | Q_UNUSED(frame);
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130 | Q_UNUSED(lineno);
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131 | Q_UNUSED(sourceID);
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132 | }
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133 |
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134 | void QScriptEngineAgentPrivate::exceptionThrow(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, bool hasHandler)
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135 | {
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136 | JSC::CallFrame *oldFrame = engine->currentFrame;
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137 | engine->currentFrame = frame.callFrame();
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138 | QScriptValue value(engine->scriptValueFromJSCValue(frame.exception()));
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139 | q_ptr->exceptionThrow(sourceID, value, hasHandler);
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140 | engine->currentFrame = oldFrame;
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141 | engine->setCurrentException(value);
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142 | };
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143 |
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144 | void QScriptEngineAgentPrivate::exceptionCatch(const JSC::DebuggerCallFrame& frame, intptr_t sourceID)
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145 | {
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146 | JSC::CallFrame *oldFrame = engine->currentFrame;
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147 | engine->currentFrame = frame.callFrame();
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148 | QScriptValue value(engine->scriptValueFromJSCValue(frame.exception()));
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149 | q_ptr->exceptionCatch(sourceID, value);
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150 | engine->currentFrame = oldFrame;
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151 | engine->clearCurrentException();
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152 | }
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153 |
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154 | void QScriptEngineAgentPrivate::atStatement(const JSC::DebuggerCallFrame& frame, intptr_t sourceID, int lineno, int column)
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155 | {
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156 | QScript::UStringSourceProviderWithFeedback *source = engine->loadedScripts.value(sourceID);
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157 | if (!source) {
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158 | // QTBUG-6108: We don't have the source for this script, so ignore.
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159 | return;
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160 | }
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161 | column = source->columnNumberFromOffset(column);
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162 | JSC::CallFrame *oldFrame = engine->currentFrame;
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163 | int oldAgentLineNumber = engine->agentLineNumber;
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164 | engine->currentFrame = frame.callFrame();
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165 | engine->agentLineNumber = lineno;
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166 | q_ptr->positionChange(sourceID, lineno, column);
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167 | engine->currentFrame = oldFrame;
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168 | engine->agentLineNumber = oldAgentLineNumber;
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169 | }
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170 |
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171 | void QScriptEngineAgentPrivate::functionExit(const JSC::JSValue& returnValue, intptr_t sourceID)
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172 | {
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173 | QScriptValue result = engine->scriptValueFromJSCValue(returnValue);
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174 | q_ptr->functionExit(sourceID, result);
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175 | q_ptr->contextPop();
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176 | }
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177 |
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178 | void QScriptEngineAgentPrivate::evaluateStop(const JSC::JSValue& returnValue, intptr_t sourceID)
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179 | {
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180 | QScriptValue result = engine->scriptValueFromJSCValue(returnValue);
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181 | q_ptr->functionExit(sourceID, result);
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182 | }
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183 |
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184 | void QScriptEngineAgentPrivate::didReachBreakpoint(const JSC::DebuggerCallFrame& frame,
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185 | intptr_t sourceID, int lineno, int column)
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186 | {
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187 | if (q_ptr->supportsExtension(QScriptEngineAgent::DebuggerInvocationRequest)) {
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188 | QScript::UStringSourceProviderWithFeedback *source = engine->loadedScripts.value(sourceID);
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189 | if (!source) {
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190 | // QTBUG-6108: We don't have the source for this script, so ignore.
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191 | return;
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192 | }
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193 | column = source->columnNumberFromOffset(column);
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194 | JSC::CallFrame *oldFrame = engine->currentFrame;
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195 | int oldAgentLineNumber = engine->agentLineNumber;
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196 | engine->currentFrame = frame.callFrame();
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197 | engine->agentLineNumber = lineno;
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198 | QList<QVariant> args;
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199 | args << qint64(sourceID) << lineno << column;
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200 | q_ptr->extension(QScriptEngineAgent::DebuggerInvocationRequest, args);
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201 | engine->currentFrame = oldFrame;
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202 | engine->agentLineNumber = oldAgentLineNumber;
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203 | }
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204 | };
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205 |
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206 | /*!
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207 | Constructs a QScriptEngineAgent object for the given \a engine.
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208 |
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209 | The engine takes ownership of the agent.
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210 |
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211 | Call QScriptEngine::setAgent() to make this agent the active
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212 | agent.
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213 | */
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214 | QScriptEngineAgent::QScriptEngineAgent(QScriptEngine *engine)
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215 | : d_ptr(new QScriptEngineAgentPrivate())
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216 | {
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217 | d_ptr->q_ptr = this;
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218 | d_ptr->engine = QScriptEnginePrivate::get(engine);
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219 | d_ptr->engine->ownedAgents.append(this);
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220 | }
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221 |
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222 | /*!
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223 | \internal
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224 | */
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225 | QScriptEngineAgent::QScriptEngineAgent(QScriptEngineAgentPrivate &dd, QScriptEngine *engine)
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226 | : d_ptr(&dd)
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227 | {
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228 | d_ptr->q_ptr = this;
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229 | d_ptr->engine = QScriptEnginePrivate::get(engine);
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230 | }
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231 |
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232 | /*!
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233 | Destroys this QScriptEngineAgent.
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234 | */
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235 | QScriptEngineAgent::~QScriptEngineAgent()
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236 | {
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237 | d_ptr->engine->agentDeleted(this); //### TODO: Can this throw?
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238 | }
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239 |
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240 | /*!
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241 |
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242 | This function is called when the engine has parsed a script and has
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243 | associated it with the given \a id. The id can be used to identify
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244 | this particular script in subsequent event notifications.
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245 |
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246 | \a program, \a fileName and \a baseLineNumber are the original
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247 | arguments to the QScriptEngine::evaluate() call that triggered this
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248 | event.
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249 |
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250 | This function is called just before the script is about to be
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251 | evaluated.
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252 |
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253 | You can reimplement this function to record information about the
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254 | script; for example, by retaining the script text, you can obtain
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255 | the line of text corresponding to a line number in a subsequent
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256 | call to positionChange().
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257 |
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258 | The default implementation does nothing.
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259 |
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260 | \sa scriptUnload()
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261 | */
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262 | void QScriptEngineAgent::scriptLoad(qint64 id, const QString &program,
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263 | const QString &fileName, int baseLineNumber)
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264 | {
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265 | Q_UNUSED(id);
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266 | Q_UNUSED(program);
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267 | Q_UNUSED(fileName);
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268 | Q_UNUSED(baseLineNumber);
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269 | }
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270 |
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271 | /*!
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272 | This function is called when the engine has discarded the script
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273 | identified by the given \a id.
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274 |
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275 | You can reimplement this function to clean up any resources you have
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276 | associated with the script.
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277 |
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278 | The default implementation does nothing.
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279 |
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280 | \sa scriptLoad()
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281 | */
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282 | void QScriptEngineAgent::scriptUnload(qint64 id)
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283 | {
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284 | Q_UNUSED(id);
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285 | }
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286 |
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287 | /*!
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288 | This function is called when a new script context has been pushed.
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289 |
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290 | The default implementation does nothing.
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291 |
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292 | \sa contextPop(), functionEntry()
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293 | */
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294 | void QScriptEngineAgent::contextPush()
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295 | {
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296 | }
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297 |
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298 | /*!
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299 | This function is called when the current script context is about to
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300 | be popped.
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301 |
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302 | The default implementation does nothing.
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303 |
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304 | \sa contextPush(), functionExit()
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305 | */
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306 | void QScriptEngineAgent::contextPop()
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307 | {
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308 | }
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309 |
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310 | /*!
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311 | This function is called when a script function is called in the
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312 | engine. If the script function is not a native Qt Script function,
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313 | it resides in the script identified by \a scriptId; otherwise, \a
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314 | scriptId is -1.
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315 |
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316 | This function is called just before execution of the script function
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317 | begins. You can obtain the QScriptContext associated with the
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318 | function call with QScriptEngine::currentContext(). The arguments
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319 | passed to the function are available.
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320 |
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321 | Reimplement this function to handle this event. For example, a
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322 | debugger implementation could reimplement this function (and
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323 | functionExit()) to keep track of the call stack and provide
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324 | step-over functionality.
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325 |
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326 | The default implementation does nothing.
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327 |
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328 | \sa functionExit(), positionChange(), QScriptEngine::currentContext()
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329 | */
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330 | void QScriptEngineAgent::functionEntry(qint64 scriptId)
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331 | {
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332 | Q_UNUSED(scriptId);
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333 | }
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334 |
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335 | /*!
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336 | This function is called when the currently executing script function
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337 | is about to return. If the script function is not a native Qt Script
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338 | function, it resides in the script identified by \a scriptId;
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339 | otherwise, \a scriptId is -1. The \a returnValue is the value that
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340 | the script function will return.
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341 |
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342 | This function is called just before the script function returns.
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343 | You can still access the QScriptContext associated with the
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344 | script function call with QScriptEngine::currentContext().
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345 |
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346 | If the engine's
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347 | \l{QScriptEngine::hasUncaughtException()}{hasUncaughtException}()
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348 | function returns true, the script function is exiting due to an
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349 | exception; otherwise, the script function is returning normally.
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350 |
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351 | Reimplement this function to handle this event; typically you will
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352 | then also want to reimplement functionEntry().
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353 |
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354 | The default implementation does nothing.
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355 |
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356 | \sa functionEntry(), QScriptEngine::hasUncaughtException()
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357 | */
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358 | void QScriptEngineAgent::functionExit(qint64 scriptId,
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359 | const QScriptValue &returnValue)
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360 | {
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361 | Q_UNUSED(scriptId);
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362 | Q_UNUSED(returnValue);
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363 | }
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364 |
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365 | /*!
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366 | This function is called when the engine is about to execute a new
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367 | statement in the script identified by \a scriptId. The statement
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368 | begins on the line and column specified by \a lineNumber and \a
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369 | columnNumber. This event is not generated for native Qt Script
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370 | functions.
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371 |
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372 | Reimplement this function to handle this event. For example, a
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373 | debugger implementation could reimplement this function to provide
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374 | line-by-line stepping, and a profiler implementation could use it to
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375 | count the number of times each statement is executed.
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376 |
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377 | The default implementation does nothing.
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378 |
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379 | \sa scriptLoad(), functionEntry()
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380 | */
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381 | void QScriptEngineAgent::positionChange(qint64 scriptId,
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382 | int lineNumber, int columnNumber)
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383 | {
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384 | Q_UNUSED(scriptId);
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385 | Q_UNUSED(lineNumber);
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386 | Q_UNUSED(columnNumber);
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387 | }
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388 |
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389 | /*!
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390 | This function is called when the given \a exception has occurred in
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391 | the engine, in the script identified by \a scriptId. If the
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392 | exception was thrown by a native Qt Script function, \a scriptId is
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393 | -1.
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394 |
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395 | If \a hasHandler is true, there is a \c{catch} or \c{finally} block
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396 | that will handle the exception. If \a hasHandler is false, there is
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397 | no handler for the exception.
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398 |
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399 | Reimplement this function if you want to handle this event. For
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400 | example, a debugger can notify the user when an uncaught exception
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401 | occurs (i.e. \a hasHandler is false).
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402 |
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403 | The default implementation does nothing.
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404 |
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405 | \sa exceptionCatch()
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406 | */
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407 | void QScriptEngineAgent::exceptionThrow(qint64 scriptId,
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408 | const QScriptValue &exception,
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409 | bool hasHandler)
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410 | {
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411 | Q_UNUSED(scriptId);
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412 | Q_UNUSED(exception);
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413 | Q_UNUSED(hasHandler);
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414 | }
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415 |
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416 | /*!
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417 | This function is called when the given \a exception is about to be
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418 | caught, in the script identified by \a scriptId.
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419 |
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420 | Reimplement this function if you want to handle this event.
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421 |
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422 | The default implementation does nothing.
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423 |
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424 | \sa exceptionThrow()
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425 | */
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426 | void QScriptEngineAgent::exceptionCatch(qint64 scriptId,
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427 | const QScriptValue &exception)
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428 | {
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429 | Q_UNUSED(scriptId);
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430 | Q_UNUSED(exception);
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431 | }
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432 |
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433 | #if 0
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434 | /*!
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435 | This function is called when a property of the given \a object has
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436 | been added, changed or removed.
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437 |
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438 | Reimplement this function if you want to handle this event.
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439 |
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440 | The default implementation does nothing.
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441 | */
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442 | void QScriptEngineAgent::propertyChange(qint64 scriptId,
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443 | const QScriptValue &object,
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444 | const QString &propertyName,
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445 | PropertyChange change)
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446 | {
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447 | Q_UNUSED(scriptId);
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448 | Q_UNUSED(object);
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449 | Q_UNUSED(propertyName);
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450 | Q_UNUSED(change);
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451 | }
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452 | #endif
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453 |
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454 | /*!
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455 | Returns true if the QScriptEngineAgent supports the given \a
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456 | extension; otherwise, false is returned. By default, no extensions
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457 | are supported.
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458 |
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459 | \sa extension()
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460 | */
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461 | bool QScriptEngineAgent::supportsExtension(Extension extension) const
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462 | {
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463 | Q_UNUSED(extension);
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464 | return false;
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465 | }
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466 |
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467 | /*!
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468 | This virtual function can be reimplemented in a QScriptEngineAgent
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469 | subclass to provide support for extensions. The optional \a argument
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470 | can be provided as input to the \a extension; the result must be
|
---|
471 | returned in the form of a QVariant. You can call supportsExtension()
|
---|
472 | to check if an extension is supported by the QScriptEngineAgent. By
|
---|
473 | default, no extensions are supported, and this function returns an
|
---|
474 | invalid QVariant.
|
---|
475 |
|
---|
476 | If you implement the DebuggerInvocationRequest extension, Qt Script
|
---|
477 | will call this function when a \c{debugger} statement is encountered
|
---|
478 | in a script. The \a argument is a QVariantList containing three
|
---|
479 | items: The first item is the scriptId (a qint64), the second item is
|
---|
480 | the line number (an int), and the third item is the column number
|
---|
481 | (an int).
|
---|
482 |
|
---|
483 | \sa supportsExtension()
|
---|
484 | */
|
---|
485 | QVariant QScriptEngineAgent::extension(Extension extension,
|
---|
486 | const QVariant &argument)
|
---|
487 | {
|
---|
488 | Q_UNUSED(extension);
|
---|
489 | Q_UNUSED(argument);
|
---|
490 | return QVariant();
|
---|
491 | }
|
---|
492 |
|
---|
493 | /*!
|
---|
494 | Returns the QScriptEngine that this agent is associated with.
|
---|
495 | */
|
---|
496 | QScriptEngine *QScriptEngineAgent::engine() const
|
---|
497 | {
|
---|
498 | Q_D(const QScriptEngineAgent);
|
---|
499 | return QScriptEnginePrivate::get(d->engine);
|
---|
500 | }
|
---|
501 |
|
---|
502 | QT_END_NAMESPACE
|
---|