Package org.jboss.byteman.rule.grammar

Examples of org.jboss.byteman.rule.grammar.ParseNode

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    private List<Method> accessibleMethods;

    private Rule(RuleScript ruleScript, ClassLoader loader, HelperManager helperManager)
            throws ParseException, TypeException, CompileException
    {
        ParseNode ruleTree;

        this.ruleScript = ruleScript;
        this.helperClass = null;
        this.loader = loader;

        typeGroup = new TypeGroup(loader);
        bindings = new Bindings();
        checked = false;
        triggerClass = null;
        triggerMethod = null;
        triggerDescriptor = null;
        triggerAccess = 0;
        returnType = null;
        accessibleFields =  null;
        accessibleMethods = null;
        // this is only set when the rule is created via a real installed transformer
        this.helperManager =  helperManager;
        ECAGrammarParser parser = null;
        try {
            String file = getFile();
            ECATokenLexer lexer = new ECATokenLexer(new StringReader(ruleScript.getRuleText()));
            lexer.setStartLine(getLine());
            lexer.setFile(file);
            parser = new ECAGrammarParser(lexer);
            parser.setFile(file);
            Symbol parse = (debugParse ? parser.debug_parse() : parser.parse());
            if (parser.getErrorCount() != 0) {
                String message = "rule " + ruleScript.getName();
                message += parser.getErrors();
                throw new ParseException(message);
            }
            ruleTree = (ParseNode) parse.value;
        } catch (ParseException pe) {
            throw pe;
        } catch (Throwable th) {
            String message = "rule " + ruleScript.getName();
            if (parser != null && parser.getErrorCount() != 0) {
                message += parser.getErrors();
            }
            message += "\n" + th.getMessage();
            throw new ParseException(message);
        }

        ParseNode eventTree = (ParseNode)ruleTree.getChild(0);
        ParseNode conditionTree = (ParseNode)ruleTree.getChild(1);
        ParseNode actionTree = (ParseNode)ruleTree.getChild(2);

        event = Event.create(this, eventTree);
        condition = Condition.create(this, conditionTree);
        action = Action.create(this, actionTree);
        key = null;
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    private List<Method> accessibleMethods;

    private Rule(RuleScript ruleScript, ClassLoader loader, HelperManager helperManager)
            throws ParseException, TypeException, CompileException
    {
        ParseNode ruleTree;

        this.ruleScript = ruleScript;
        this.helperClass = null;
        this.loader = loader;

        typeGroup = new TypeGroup(loader);
        bindings = new Bindings();
        checked = false;
        triggerClass = null;
        triggerMethod = null;
        triggerDescriptor = null;
        triggerAccess = 0;
        returnType = null;
        accessibleFields =  null;
        accessibleMethods = null;
        // this is only set when the rule is created via a real installed transformer
        this.helperManager =  helperManager;
        ECAGrammarParser parser = null;
        try {
            String file = getFile();
            ECATokenLexer lexer = new ECATokenLexer(new StringReader(ruleScript.getRuleText()));
            lexer.setStartLine(getLine());
            lexer.setFile(file);
            parser = new ECAGrammarParser(lexer);
            parser.setFile(file);
            Symbol parse = (debugParse ? parser.debug_parse() : parser.parse());
            if (parser.getErrorCount() != 0) {
                String message = "rule " + ruleScript.getName();
                message += parser.getErrors();
                throw new ParseException(message);
            }
            ruleTree = (ParseNode) parse.value;
        } catch (ParseException pe) {
            throw pe;
        } catch (Throwable th) {
            String message = "rule " + ruleScript.getName();
            if (parser != null && parser.getErrorCount() != 0) {
                message += parser.getErrors();
            }
            message += "\n" + th.getMessage();
            throw new ParseException(message);
        }

        ParseNode eventTree = (ParseNode)ruleTree.getChild(0);
        ParseNode conditionTree = (ParseNode)ruleTree.getChild(1);
        ParseNode actionTree = (ParseNode)ruleTree.getChild(2);

        event = Event.create(this, eventTree);
        condition = Condition.create(this, conditionTree);
        action = Action.create(this, actionTree);
        key = null;
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            case IDENTIFIER:
            {
                // check for path qualifier

                String name = (String)exprTree.getChild(0);
                ParseNode child1 = (ParseNode)exprTree.getChild(1);

                if (child1 == null && bindings.lookup(name) != null) {
                    // a clear cut direct variable reference
                    expr = new Variable(rule, type, exprTree);
                } else {
                    // we should only get these as identifiers for binding types or throw types which are
                    // explicitly caught by the bindings or throw processing case handlers so this is an error

                    throw new TypeException("ExpressionHelper.createExpression : unexpected IDENTIFIER " + exprTree.getText() + " in "  + exprTree.getPos());
                }
            }
            break;
            case ARRAY:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);

                Expression arrayRef = createExpression(rule, bindings, child0, Type.UNDEFINED);

                List<Expression> indices = createExpressionList(rule, bindings, child1, Type.I);

                if (indices != null) {
                    expr = new ArrayExpression(rule, type, exprTree, arrayRef, indices);
                } else {
                    throw new TypeException("ExpressionHelper.createExpression : invalid array index expression " + exprTree.getPos());
                }
            }
            break;
            case FIELD:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);
                expr = createFieldExpression(rule, bindings, child0, child1, type);
            }
            break;
            case CLASS:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                expr = createClassLiteralExpression(rule, bindings, child0, type);
            }
            break;
            case METH:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);
                ParseNode child2 = (ParseNode) exprTree.getChild(2);
                int tag0 = child0.getTag();
                if (tag0 != IDENTIFIER) {
                    // uurgh we expected a method name
                    throw new TypeException("ExpressionHelper.createExpression : invalid method selector " + tag + " in expression " + child0.getText() + child0.getPos());
                }

                expr = createCallExpression(rule, bindings, child0, child1, child2, type);
            }
            break;
            case THROW:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);
                int tag0 = child0.getTag();

                if (tag0 != IDENTIFIER) {
                    throw new TypeException("ExpressionHelper.createExpression : invalid throw type " + tag + " in expression " + child0.getText() + child0.getPos());
                } else {
                    expr = createThrowExpression(rule, bindings, child0, child1);
                }
            }
            break;
            case NEW:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);
                ParseNode child2 = (ParseNode) exprTree.getChild(2);
                int tag0 = child0.getTag();

                if (tag0 != IDENTIFIER) {
                    throw new TypeException("ExpressionHelper.createExpression : invalid new type " + tag + " in expression " + child0.getText() + child0.getPos());
                } else {
                    expr = createNewExpression(rule, bindings, child0, child1, child2);
                }
            }
            break;
            case INTEGER_LITERAL:
            {
                expr = new NumericLiteral(rule, Type.I, exprTree);
            }
            break;
            case FLOAT_LITERAL:
            {
                expr = new NumericLiteral(rule, Type.F, exprTree);
            }
            break;
            case STRING_LITERAL:
            {
                expr = new StringLiteral(rule, exprTree);
            }
            break;
            case BOOLEAN_LITERAL:
            {
                expr = new BooleanLiteral(rule, exprTree);
            }
            break;
            case NULL_LITERAL:
            {
                expr = new NullLiteral(rule, exprTree);
            }
            break;
            case RETURN:
            {
                Expression returnValue;
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                if (child0 != null) {
                    returnValue = createExpression(rule, bindings, child0);
                } else {
                    returnValue = null;
                }
                expr = new ReturnExpression(rule, exprTree, returnValue);
            }
            break;
            case DOLLAR:
            {
                String text = (String)exprTree.getChild(0);
                char leading = text.charAt(1);
                if (Character.isDigit(leading)) {
                    int index = Integer.valueOf(text.substring(1));
                    expr = new DollarExpression(rule, type, exprTree, index);
                } else if (text.equals("$!")) {
                    expr = new DollarExpression(rule, type, exprTree, DollarExpression.RETURN_VALUE_IDX);
                } else if (text.equals("$^")) {
                    expr = new DollarExpression(rule, type, exprTree, DollarExpression.THROWABLE_VALUE_IDX);
                } else if (text.equals("$#")) {
                    expr = new DollarExpression(rule, Type.I, exprTree, DollarExpression.PARAM_COUNT_IDX);
                } else if (text.equals("$*")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.PARAM_ARRAY_IDX);
                } else if (text.equals("$@")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.INVOKE_PARAM_ARRAY_IDX);
                } else if (text.equals("$CLASS")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.TRIGGER_CLASS_IDX);
                } else if (text.equals("$METHOD")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.TRIGGER_METHOD_IDX);
                } else {
                    expr = new DollarExpression(rule, type, exprTree, text.substring(1));
                }
            }
            break;
            case ASSIGN:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);
                // the left hand side is special but nay expression will do for the right hand side

                AssignableExpression left = createAssignableExpression(rule, bindings, child0, type);;
                Expression right = createExpression(rule, bindings, child1, type);

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    }

    public static String[] createPathList(ParseNode pathTree)
    {
        int l = 0;
        ParseNode p = pathTree;

        while (p != null) {
            l++;
            p = (ParseNode)p.getChild(1);
        }

        String[] pathList = new String[l];

        p = pathTree;
        while (p != null) {
            l--;
            pathList[l] = (String)p.getText();
            p = (ParseNode)p.getChild(1);
        }

        return pathList;
    }
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    public static Expression createUnaryExpression(Rule rule, Bindings bindings, ParseNode exprTree, Type type)
            throws TypeException
    {
        // we expect ^(UNOP unary_oper expr)

        ParseNode child0 = (ParseNode) exprTree.getChild(0);
        ParseNode child1 = (ParseNode) exprTree.getChild(1);
        Expression expr;
        int tag = child0.getTag();

        switch (tag)
        {
            case TWIDDLE:
            {
                // the argument must be a numeric expression
                if (!type.isUndefined() && !type.isVoid() && !type.isNumeric()) {
                    throw new TypeException("ExpressionHelper.createUnaryExpression : invalid numeric expression" + exprTree.getPos());
                }
                Expression operand = createExpression(rule, bindings, child1, Type.NUMBER);
                expr = new TwiddleExpression(rule, exprTree, operand);
            }
            break;
            case NOT:
            {
                // the argument must be a boolean expression
                if (!type.isUndefined() && !type.isVoid() && !type.isBoolean()) {
                    throw new TypeException("ExpressionHelper.createUnaryExpression : invalid boolean expression" + exprTree.getPos());
                }
                Expression operand = createExpression(rule, bindings, child1, Type.BOOLEAN);
                expr = new NotExpression(rule, exprTree, operand);
            }
            break;
            case UMINUS:
            {
                // the argument must be a numeric expression
                if (!type.isUndefined() && !type.isVoid() && !type.isBoolean()) {
                    throw new TypeException("ExpressionHelper.createUnaryExpression : invalid boolean expression" + exprTree.getPos());
                }
                Expression operand = createExpression(rule, bindings, child1, Type.NUMBER);
                expr = new MinusExpression(rule, exprTree, operand);
            }
            break;
            case DOLLAR:
            {
                if (child1.getTag() == IDENTIFIER) {
                    if (child1.getText().equals("!")) {
                        expr = new DollarExpression(rule, type, exprTree, DollarExpression.RETURN_VALUE_IDX);
                    } else if (child1.getText().equals("^")) {
                        expr = new DollarExpression(rule, type, exprTree, DollarExpression.THROWABLE_VALUE_IDX);
                    } else if (child1.getText().equals("#")) {
                        expr = new DollarExpression(rule, Type.I, exprTree, DollarExpression.PARAM_COUNT_IDX);
                    } else if (child1.getText().equals("*")) {
                        expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.PARAM_ARRAY_IDX);
                    } else if (child1.getText().equals("@")) {
                        expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.INVOKE_PARAM_ARRAY_IDX);
                    } else if (child1.getText().equals("CLASS")) {
                        expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.TRIGGER_CLASS_IDX);
                    } else if (child1.getText().equals("METHOD")) {
                        expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.TRIGGER_METHOD_IDX);
                    } else {
                        expr = new DollarExpression(rule, type, exprTree, child1.getText());
                    }
                } else if (child1.getTag() == INTEGER_LITERAL) {
                    Integer intObject = (Integer) child1.getChild(0);
                    expr = new DollarExpression(rule, type, exprTree, intObject.intValue());
                } else {
                    throw new TypeException("ExpressionHelper.createUnaryExpression : unexpected token type " + child1.getTag() + " for dollar expression tree " + child1.getText() + "" + child1.getPos());
                }
            }
            break;
            default:
            {
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    public static Expression createBinaryExpression(Rule rule, Bindings bindings, ParseNode exprTree, Type type)
            throws TypeException
    {
        // we expect ^(BINOP infix_oper simple_expr expr)

        ParseNode child0 = (ParseNode) exprTree.getChild(0);
        ParseNode child1 = (ParseNode) exprTree.getChild(1);
        ParseNode child2 = (ParseNode) exprTree.getChild(2);
        Expression expr;
        int oper = child0.getTag();

        switch (oper)
        {
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    public static Expression createTernaryExpression(Rule rule, Bindings bindings, ParseNode exprTree, Type type)
            throws TypeException
    {
        // we only expect ^(TERNOP ternary_oper simple_expr expr expr)

        ParseNode child0 = (ParseNode) exprTree.getChild(0);
        ParseNode child1 = (ParseNode) exprTree.getChild(1);
        ParseNode child2 = (ParseNode) exprTree.getChild(2);
        Expression expr;
        int oper = exprTree.getTag();

        switch (oper)
        {
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        // we allow assignment to identifiers or dollar symbols
        int tag = exprTree.getTag();
        switch(tag) {
            case FIELD:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);
                expr = createFieldExpression(rule, bindings, child0, child1, type);
            }
            break;
            case IDENTIFIER:
            {
                String name = (String)exprTree.getChild(0);
                ParseNode child1 = (ParseNode)exprTree.getChild(1);

                if (child1 == null && bindings.lookup(name) != null) {
                    // a clear cut direct variable reference
                    expr = new Variable(rule, type, exprTree, name);
                } else {
                    // we should only get these as identifiers for binding types or throw types which are
                    // explicitly caught by the bindings or throw processing case handlers so this is an error

                    throw new TypeException("ExpressionHelper.createAssignableExpression : unexpected IDENTIFIER " + exprTree.getText() + " in "  + exprTree.getPos());
                }
            }
            break;
            case DOLLAR:
            {
                String text = (String)exprTree.getChild(0);
                char leading = text.charAt(1);
                if (Character.isDigit(leading)) {
                    int index = Integer.valueOf(text.substring(1));
                    expr = new DollarExpression(rule, type, exprTree, index);
                } else if (text.equals("$!")) {
                    expr = new DollarExpression(rule, type, exprTree, DollarExpression.RETURN_VALUE_IDX);
                } else if (text.equals("$^")) {
                    expr = new DollarExpression(rule, type, exprTree, DollarExpression.THROWABLE_VALUE_IDX);
                } else if (text.equals("$#")) {
                    expr = new DollarExpression(rule, Type.I, exprTree, DollarExpression.PARAM_COUNT_IDX);
                } else if (text.equals("$*")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.PARAM_ARRAY_IDX);
                } else if (text.equals("$@")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.INVOKE_PARAM_ARRAY_IDX);
                } else if (text.equals("$CLASS")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.TRIGGER_CLASS_IDX);
                } else if (text.equals("$METHOD")) {
                    expr = new DollarExpression(rule, rule.getTypeGroup().createArray(Type.OBJECT), exprTree, DollarExpression.TRIGGER_METHOD_IDX);
                } else {
                    expr = new DollarExpression(rule, type, exprTree, text.substring(1));
                }
            }
            break;
            case ARRAY:
            {
                ParseNode child0 = (ParseNode) exprTree.getChild(0);
                ParseNode child1 = (ParseNode) exprTree.getChild(1);

                Expression arrayRef = createExpression(rule, bindings, child0, Type.UNDEFINED);

                List<Expression> indices = createExpressionList(rule, bindings, child1, Type.I);

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                switch (exprTree.getTag())
                {
                    case SEMI:
                    case COMMA:
                    {
                        ParseNode child0 = (ParseNode) exprTree.getChild(0);
                        // assign tree before we risk an exception
                        exprTree = (ParseNode) exprTree.getChild(1);
                        Expression expr = createExpression(rule, bindings, child0, type);
                        exprList.add(expr);
                    }
                    break;
                    default:
                    {
                        // assign tree before we risk an exception
                        ParseNode saveTree = exprTree;
                        exprTree = null;
                        Expression expr = createExpression(rule, bindings, saveTree, type);
                        exprList.add(expr);
                    }
                    break;
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        int emptyDimCount = 0;

        while (exprTree != null)
        {
            try {
                ParseNode saveTree = exprTree;
                ParseNode child;
                if (exprTree.getTag() == COMMA) {
                    child = (ParseNode) exprTree.getChild(0);
                    exprTree = (ParseNode) exprTree.getChild(1);
                } else {
                    child = exprTree;
                    exprTree = null;
                }
                // count an extra array dimension
                arrayDimCount++;

                if (child.getTag() == NOTHING) {
                    //  this is an empty array dimension
                    emptyDimCount++;
                    foundEmptyDim = true;
                    // append null to the list to represent the empty dimension
                    exprList.add(null);
                } else  if (!foundEmptyDim){
                    Expression expr = createExpression(rule, bindings, child, Type.I);
                    exprList.add(expr);
                } else {
                    // once we see an empty dim we expect to see al empty dims
                    throw new TypeException("ExpressionHelper.createNewExpressionIndexList : invalid array dimension " + child.getPos());
                }
            } catch (TypeException te) {
                exceptions.add(te);
            }
        }
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  • org.jboss.byteman.rule.expression.ExpressionHelper
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