Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCRIPTCOMPILER_P_H
+#define QSCRIPTCOMPILER_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QMap>
+
+#ifndef QT_NO_SCRIPT
+
+#include <QtCore/QVector>
+
+#include "qscriptastvisitor_p.h"
+#include "qscriptasm_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class QScriptEnginePrivate;
+
+namespace QScript {
+
+class Compiler: protected AST::Visitor
+{
+public:
+    Compiler(QScriptEnginePrivate *eng);
+    virtual ~Compiler();
+
+    inline QScriptEnginePrivate *engine() const { return m_eng; }
+
+    bool topLevelCompiler() const;
+    void setTopLevelCompiler(bool b);
+
+    CompilationUnit compile(AST::Node *node, const QList<QScriptNameIdImpl *> &formals
+                            = QList<QScriptNameIdImpl *>());
+
+    struct Label {
+        Label(int o = 0):
+            offset (o) {}
+
+        int offset;
+        QVector<int> uses;
+    };
+
+// instruction set
+    void iAdd();
+    void iAssign();
+    void iBitAnd();
+    void iBitOr();
+    void iBitXor();
+    void iBitNot();
+    void iBranch(int index);
+    void iBranchTrue(int index);
+    void iBranchFalse(int index);
+    void iCall(int argc);
+    void iDeclareLocal(QScriptNameIdImpl *id, bool readOnly);
+    void iDecr();
+    void iDelete();
+    void iDiv();
+    void iDuplicate();
+    void iEqual();
+    void iFetch(QScriptNameIdImpl *id);
+    void iFetchField();
+    void iLazyArguments();
+    void iGreatOrEqual();
+    void iGreatThan();
+    void iIncr();
+    void iInplaceAdd();
+    void iInplaceAnd();
+    void iInplaceDecr();
+    void iInplaceDiv();
+    void iInplaceLeftShift();
+    void iInplaceMod();
+    void iInplaceMul();
+    void iInplaceOr();
+    void iInplaceRightShift();
+    void iInplaceSub();
+    void iInplaceURightShift();
+    void iInstanceOf();
+    void iLeftShift();
+    void iLessOrEqual();
+    void iLessThan();
+    void iLoadFalse();
+    void iLoadNumber(double number);
+    void iLoadString(QScriptNameIdImpl *id);
+    void iNewString(QScriptNameIdImpl *id);
+    void iLoadThis();
+    void iLoadActivation();
+    void iLoadNull();
+    void iLoadTrue();
+    void iLoadUndefined();
+    void iMod();
+    void iMul();
+    void iUnaryPlus();
+    void iUnaryMinus();
+    void iNew(int argc);
+    void iNewArray();
+    void iNewClosure(AST::FunctionExpression *expr);
+    void iNewObject();
+    void iNewRegExp(QScriptNameIdImpl *pattern);
+    void iNewRegExp(QScriptNameIdImpl *pattern, int flags);
+    void iNot();
+    void iNotEqual();
+    void iPop();
+    void iPostDecr();
+    void iPostIncr();
+    void iPutField();
+    void iResolve(QScriptNameIdImpl *id);
+    void iRet();
+    void iRightShift();
+    void iSub();
+    void iStrictEqual();
+    void iStrictNotEqual();
+    void iSwap();
+    void iThrow();
+    void iTypeOf();
+    void iURightShift();
+    void iInplaceXor();
+    void iLine(AST::Node *node);
+    void iNewEnumeration();
+    void iToFirstElement();
+    void iHasNextElement();
+    void iNextElement();
+    void iEnterWith();
+    void iLeaveWith();
+    void iBeginCatch(QScriptNameIdImpl *id);
+    void iEndCatch();
+    void iSync();
+    void iHalt();
+    void iMakeReference();
+    void iIn();
+    void iNop();
+    void iDebugger();
+
+protected:
+    virtual bool preVisit(AST::Node *node);
+
+    virtual bool visit(AST::ArrayLiteral *node);
+    virtual bool visit(AST::ArrayMemberExpression *node);
+    virtual bool visit(AST::Expression *node);
+    virtual bool visit(AST::BinaryExpression *node);
+    virtual bool visit(AST::BreakStatement *node);
+    virtual bool visit(AST::CallExpression *node);
+    virtual bool visit(AST::ConditionalExpression *node);
+    virtual bool visit(AST::ContinueStatement *node);
+    virtual bool visit(AST::DeleteExpression *node);
+    virtual bool visit(AST::DoWhileStatement *node);
+    virtual bool visit(AST::ExpressionStatement *node);
+    virtual bool visit(AST::FalseLiteral *node);
+    virtual bool visit(AST::FieldMemberExpression *node);
+    virtual bool visit(AST::ForEachStatement *node);
+    virtual bool visit(AST::LocalForEachStatement *node);
+    virtual bool visit(AST::ForStatement *node);
+    virtual bool visit(AST::FunctionDeclaration *node);
+    virtual bool visit(AST::FunctionExpression *node);
+    virtual bool visit(AST::FunctionSourceElement *node);
+    virtual bool visit(AST::IdentifierExpression *node);
+    virtual bool visit(AST::IfStatement *node);
+    virtual bool visit(AST::LabelledStatement *node);
+    virtual bool visit(AST::LocalForStatement *node);
+    virtual bool visit(AST::NewExpression *node);
+    virtual bool visit(AST::NewMemberExpression *node);
+    virtual bool visit(AST::NumericLiteral *node);
+    virtual bool visit(AST::ObjectLiteral *node);
+    virtual bool visit(AST::PostDecrementExpression *node);
+    virtual bool visit(AST::PostIncrementExpression *node);
+    virtual bool visit(AST::PreDecrementExpression *node);
+    virtual bool visit(AST::PreIncrementExpression *node);
+    virtual bool visit(AST::RegExpLiteral *node);
+    virtual bool visit(AST::ReturnStatement *node);
+    virtual bool visit(AST::SourceElements *node);
+    virtual bool visit(AST::StatementList *node);
+    virtual bool visit(AST::StatementSourceElement *node);
+    virtual bool visit(AST::StringLiteral *node);
+    virtual bool visit(AST::SwitchStatement *node);
+    virtual bool visit(AST::ThisExpression *node);
+    virtual bool visit(AST::NullExpression *node);
+    virtual bool visit(AST::ThrowStatement *node);
+    virtual bool visit(AST::TryStatement *node);
+    virtual bool visit(AST::TrueLiteral *node);
+    virtual bool visit(AST::VariableStatement *node);
+    virtual bool visit(AST::VariableDeclaration *node);
+    virtual bool visit(AST::WhileStatement *node);
+    virtual bool visit(AST::WithStatement *node);
+    virtual bool visit(AST::Block *node);
+    virtual bool visit(AST::TypeOfExpression *node);
+    virtual bool visit(AST::DebuggerStatement *node);
+
+    virtual void endVisit(AST::BreakStatement *node);
+    virtual void endVisit(AST::ContinueStatement *node);
+    virtual void endVisit(AST::ExpressionStatement *node);
+    virtual void endVisit(AST::NotExpression *node);
+    virtual void endVisit(AST::ReturnStatement *node);
+    virtual void endVisit(AST::ThrowStatement *node);
+    virtual void endVisit(AST::TildeExpression *node);
+    virtual void endVisit(AST::UnaryPlusExpression *node);
+    virtual void endVisit(AST::UnaryMinusExpression *node);
+    virtual void endVisit(AST::VoidExpression *node);
+    virtual void endVisit(AST::EmptyStatement *node);
+
+    void visitForInternal(AST::Statement *node, AST::ExpressionNode *condition,
+                          AST::Statement *statement, AST::ExpressionNode *expression);
+
+    bool isAssignmentOperator(int op) const;
+    int inplaceAssignmentOperator(int op) const;
+
+    inline int nextInstructionOffset() const
+    { return m_instructions.count(); }
+
+    inline void pushInstruction(QScriptInstruction::Operator op)
+    {
+        pushInstruction(op, QScriptValueImpl(), QScriptValueImpl());
+    }
+
+    inline void pushInstruction(QScriptInstruction::Operator op,
+                                const QScriptValueImpl &arg1)
+    {
+        pushInstruction(op, arg1, QScriptValueImpl());
+    }
+
+    inline void pushInstruction(QScriptInstruction::Operator op,
+                                const QScriptValueImpl &arg1,
+                                const QScriptValueImpl &arg2)
+    {
+        QScriptInstruction i;
+        i.op = op;
+        i.operand[0] = arg1;
+        i.operand[1] = arg2;
+        m_instructions.append(i);
+    }
+
+    inline bool generateReferences(bool b)
+    {
+        bool was = m_generateReferences;
+        m_generateReferences = b;
+        return was;
+    }
+
+    inline bool generateFastArgumentLookup(bool b)
+    {
+        bool was = m_generateFastArgumentLookup;
+        m_generateFastArgumentLookup= b;
+        return was;
+    }
+
+    inline bool iterationStatement(bool b)
+    {
+        bool was = m_iterationStatement;
+        m_iterationStatement = b;
+        return was;
+    }
+
+    inline bool switchStatement(bool b)
+    {
+        bool was = m_switchStatement;
+        m_switchStatement = b;
+        return was;
+    }
+
+    inline bool changeParseStatements(bool b)
+    {
+        bool was = m_parseStatements;
+        m_parseStatements = b;
+        return was;
+    }
+
+    inline bool withStatement(bool b)
+    {
+        bool was = m_withStatement;
+        m_withStatement = b;
+        return was;
+    }
+
+    inline bool generateLeaveOnBreak(bool b)
+    {
+        bool was = m_generateLeaveWithOnBreak;
+        m_generateLeaveWithOnBreak = b;
+        return was;
+    }
+
+    void patchInstruction(int index, int offset);
+
+private:
+    QScriptEnginePrivate *m_eng;
+
+    uint m_generateReferences: 1;
+    uint m_iterationStatement: 1;
+    uint m_switchStatement: 1;
+    uint m_withStatement: 1;
+    uint m_generateLeaveWithOnBreak: 1;
+    uint m_generateFastArgumentLookup: 1;
+    uint m_parseStatements: 1;
+    uint m_pad: 25;
+
+    bool m_topLevelCompiler; // bit
+    QVector<QScriptInstruction> m_instructions;
+    QVector<ExceptionHandlerDescriptor> m_exceptionHandlers;
+    QList<QScriptNameIdImpl *> m_formals;
+
+    struct Loop {
+        Loop(QScriptNameIdImpl *n = 0):
+            name(n) {}
+
+        QScriptNameIdImpl *name;
+        Label breakLabel;
+        Label continueLabel;
+    };
+
+    inline Loop *changeActiveLoop(Loop *activeLoop)
+    {
+        Loop *was = m_activeLoop;
+        m_activeLoop = activeLoop;
+        return was;
+    }
+
+    Loop *findLoop(QScriptNameIdImpl *name = 0);
+
+    Loop *m_activeLoop;
+    QMap<AST::Statement*, Loop> m_loops;
+    CompilationUnit m_compilationUnit;
+};
+
+} // namespace QScript
+
+#endif // QT_NO_SCRIPT
+
+QT_END_NAMESPACE
+
+#endif