Java Code Examples for jdk.internal.dynalink.linker.LinkRequest#isCallSiteUnstable()

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

@Override
public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
    if (request.isCallSiteUnstable()) {
        // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
        return super.lookup(desc, request);
    }

    // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
    // necessity have a Nashorn descriptor - it is safe to cast.
    final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
    FindProperty find = null;
    GuardedInvocation link = null;
    ScriptObject self;

    final boolean isNamedOperation;
    final String name;
    if (desc.getNameTokenCount() > 2) {
        isNamedOperation = true;
        name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    } else {
        isNamedOperation = false;
        name = null;
    }

    self = expression;
    if (isNamedOperation) {
         find = self.findProperty(name, true);
    }

    if (find != null) {
        link = self.lookup(desc, request);
        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    final ScriptObject scope = getProto();
    if (isNamedOperation) {
        find = scope.findProperty(name, true);
    }

    if (find != null) {
        return fixScopeCallSite(scope.lookup(desc, request), name, find.getOwner());
    }

    // the property is not found - now check for
    // __noSuchProperty__ and __noSuchMethod__ in expression
    if (self != null) {
        final String fallBack;

        final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);

        switch (operator) {
        case "callMethod":
            throw new AssertionError(); // Nashorn never emits callMethod
        case "getMethod":
            fallBack = NO_SUCH_METHOD_NAME;
            break;
        case "getProp":
        case "getElem":
            fallBack = NO_SUCH_PROPERTY_NAME;
            break;
        default:
            fallBack = null;
            break;
        }

        if (fallBack != null) {
            find = self.findProperty(fallBack, true);
            if (find != null) {
                switch (operator) {
                case "getMethod":
                    link = self.noSuchMethod(desc, request);
                    break;
                case "getProp":
                case "getElem":
                    link = self.noSuchProperty(desc, request);
                    break;
                default:
                    break;
                }
            }
        }

        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    // still not found, may be scope can handle with it's own
    // __noSuchProperty__, __noSuchMethod__ etc.
    link = scope.lookup(desc, request);

    if (link != null) {
        return fixScopeCallSite(link, name, null);
    }

    return null;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

@Override
public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
    if (request.isCallSiteUnstable()) {
        // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
        return super.lookup(desc, request);
    }

    // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
    // necessity have a Nashorn descriptor - it is safe to cast.
    final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
    FindProperty find = null;
    GuardedInvocation link = null;
    ScriptObject self;

    final boolean isNamedOperation;
    final String name;
    if (desc.getNameTokenCount() > 2) {
        isNamedOperation = true;
        name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    } else {
        isNamedOperation = false;
        name = null;
    }

    self = expression;
    if (isNamedOperation) {
         find = self.findProperty(name, true);
    }

    if (find != null) {
        link = self.lookup(desc, request);
        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    final ScriptObject scope = getProto();
    if (isNamedOperation) {
        find = scope.findProperty(name, true);
    }

    if (find != null) {
        return fixScopeCallSite(scope.lookup(desc, request), name, find.getOwner());
    }

    // the property is not found - now check for
    // __noSuchProperty__ and __noSuchMethod__ in expression
    if (self != null) {
        final String fallBack;

        final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);

        switch (operator) {
        case "callMethod":
            throw new AssertionError(); // Nashorn never emits callMethod
        case "getMethod":
            fallBack = NO_SUCH_METHOD_NAME;
            break;
        case "getProp":
        case "getElem":
            fallBack = NO_SUCH_PROPERTY_NAME;
            break;
        default:
            fallBack = null;
            break;
        }

        if (fallBack != null) {
            find = self.findProperty(fallBack, true);
            if (find != null) {
                switch (operator) {
                case "getMethod":
                    link = self.noSuchMethod(desc, request);
                    break;
                case "getProp":
                case "getElem":
                    link = self.noSuchProperty(desc, request);
                    break;
                default:
                    break;
                }
            }
        }

        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    // still not found, may be scope can handle with it's own
    // __noSuchProperty__, __noSuchMethod__ etc.
    link = scope.lookup(desc, request);

    if (link != null) {
        return fixScopeCallSite(link, name, null);
    }

    return null;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

@Override
public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
    if (request.isCallSiteUnstable()) {
        // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
        return super.lookup(desc, request);
    }

    // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
    // necessity have a Nashorn descriptor - it is safe to cast.
    final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
    FindProperty find = null;
    GuardedInvocation link = null;
    ScriptObject self;

    final boolean isNamedOperation;
    final String name;
    if (desc.getNameTokenCount() > 2) {
        isNamedOperation = true;
        name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    } else {
        isNamedOperation = false;
        name = null;
    }

    self = expression;
    if (isNamedOperation) {
         find = self.findProperty(name, true);
    }

    if (find != null) {
        link = self.lookup(desc, request);
        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    final ScriptObject scope = getProto();
    if (isNamedOperation) {
        find = scope.findProperty(name, true);
    }

    if (find != null) {
        return fixScopeCallSite(scope.lookup(desc, request), name, find.getOwner());
    }

    // the property is not found - now check for
    // __noSuchProperty__ and __noSuchMethod__ in expression
    if (self != null) {
        final String fallBack;

        final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);

        switch (operator) {
        case "callMethod":
            throw new AssertionError(); // Nashorn never emits callMethod
        case "getMethod":
            fallBack = NO_SUCH_METHOD_NAME;
            break;
        case "getProp":
        case "getElem":
            fallBack = NO_SUCH_PROPERTY_NAME;
            break;
        default:
            fallBack = null;
            break;
        }

        if (fallBack != null) {
            find = self.findProperty(fallBack, true);
            if (find != null) {
                switch (operator) {
                case "getMethod":
                    link = self.noSuchMethod(desc, request);
                    break;
                case "getProp":
                case "getElem":
                    link = self.noSuchProperty(desc, request);
                    break;
                default:
                    break;
                }
            }
        }

        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    // still not found, may be scope can handle with it's own
    // __noSuchProperty__, __noSuchMethod__ etc.
    link = scope.lookup(desc, request);

    if (link != null) {
        return fixScopeCallSite(link, name, null);
    }

    return null;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

@Override
public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
    if (request.isCallSiteUnstable()) {
        // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
        return super.lookup(desc, request);
    }

    // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
    // necessity have a Nashorn descriptor - it is safe to cast.
    final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
    FindProperty find = null;
    GuardedInvocation link = null;
    ScriptObject self;

    final boolean isNamedOperation;
    final String name;
    if (desc.getNameTokenCount() > 2) {
        isNamedOperation = true;
        name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    } else {
        isNamedOperation = false;
        name = null;
    }

    self = expression;
    if (isNamedOperation) {
         find = self.findProperty(name, true);
    }

    if (find != null) {
        link = self.lookup(desc, request);
        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    final ScriptObject scope = getProto();
    if (isNamedOperation) {
        find = scope.findProperty(name, true);
    }

    if (find != null) {
        return fixScopeCallSite(scope.lookup(desc, request), name, find.getOwner());
    }

    // the property is not found - now check for
    // __noSuchProperty__ and __noSuchMethod__ in expression
    if (self != null) {
        final String fallBack;

        final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);

        switch (operator) {
        case "callMethod":
            throw new AssertionError(); // Nashorn never emits callMethod
        case "getMethod":
            fallBack = NO_SUCH_METHOD_NAME;
            break;
        case "getProp":
        case "getElem":
            fallBack = NO_SUCH_PROPERTY_NAME;
            break;
        default:
            fallBack = null;
            break;
        }

        if (fallBack != null) {
            find = self.findProperty(fallBack, true);
            if (find != null) {
                switch (operator) {
                case "getMethod":
                    link = self.noSuchMethod(desc, request);
                    break;
                case "getProp":
                case "getElem":
                    link = self.noSuchProperty(desc, request);
                    break;
                default:
                    break;
                }
            }
        }

        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    // still not found, may be scope can handle with it's own
    // __noSuchProperty__, __noSuchMethod__ etc.
    link = scope.lookup(desc, request);

    if (link != null) {
        return fixScopeCallSite(link, name, null);
    }

    return null;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

@Override
public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
    if (request.isCallSiteUnstable()) {
        // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
        return super.lookup(desc, request);
    }

    // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
    // necessity have a Nashorn descriptor - it is safe to cast.
    final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
    FindProperty find = null;
    GuardedInvocation link = null;
    ScriptObject self;

    final boolean isNamedOperation;
    final String name;
    if (desc.getNameTokenCount() > 2) {
        isNamedOperation = true;
        name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    } else {
        isNamedOperation = false;
        name = null;
    }

    self = expression;
    if (isNamedOperation) {
         find = self.findProperty(name, true);
    }

    if (find != null) {
        link = self.lookup(desc, request);
        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    final ScriptObject scope = getProto();
    if (isNamedOperation) {
        find = scope.findProperty(name, true);
    }

    if (find != null) {
        return fixScopeCallSite(scope.lookup(desc, request), name, find.getOwner());
    }

    // the property is not found - now check for
    // __noSuchProperty__ and __noSuchMethod__ in expression
    if (self != null) {
        final String fallBack;

        final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);

        switch (operator) {
        case "callMethod":
            throw new AssertionError(); // Nashorn never emits callMethod
        case "getMethod":
            fallBack = NO_SUCH_METHOD_NAME;
            break;
        case "getProp":
        case "getElem":
            fallBack = NO_SUCH_PROPERTY_NAME;
            break;
        default:
            fallBack = null;
            break;
        }

        if (fallBack != null) {
            find = self.findProperty(fallBack, true);
            if (find != null) {
                switch (operator) {
                case "getMethod":
                    link = self.noSuchMethod(desc, request);
                    break;
                case "getProp":
                case "getElem":
                    link = self.noSuchProperty(desc, request);
                    break;
                default:
                    break;
                }
            }
        }

        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    // still not found, may be scope can handle with it's own
    // __noSuchProperty__, __noSuchMethod__ etc.
    link = scope.lookup(desc, request);

    if (link != null) {
        return fixScopeCallSite(link, name, null);
    }

    return null;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    if (request.isCallSiteUnstable()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean scope = isScope();
    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, scope, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (!scope && find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, "property.not.writable", false);
        }
        // Otherwise, forget the found property
        find = null;
    }

    if (find != null) {
        if(!find.getProperty().isWritable()) {
            // Existing, non-writable property
            return createEmptySetMethod(desc, "property.not.writable", true);
        }
    } else {
        if (PROTO_PROPERTY_NAME.equals(name)) {
            return new GuardedInvocation(SETPROTOCHECK, NashornGuards.getScriptObjectGuard());
        } else if (! isExtensible()) {
            return createEmptySetMethod(desc, "object.non.extensible", false);
        }
    }

    return new SetMethodCreator(this, find, desc).createGuardedInvocation();
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    if (request.isCallSiteUnstable()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean scope = isScope();
    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, scope, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (!scope && find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, "property.not.writable", false);
        }
        // Otherwise, forget the found property
        find = null;
    }

    if (find != null) {
        if(!find.getProperty().isWritable()) {
            // Existing, non-writable property
            return createEmptySetMethod(desc, "property.not.writable", true);
        }
    } else {
        if (PROTO_PROPERTY_NAME.equals(name)) {
            return new GuardedInvocation(SETPROTOCHECK, NashornGuards.getScriptObjectGuard());
        } else if (! isExtensible()) {
            return createEmptySetMethod(desc, "object.non.extensible", false);
        }
    }

    return new SetMethodCreator(this, find, desc).createGuardedInvocation();
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);

    if (request.isCallSiteUnstable() || hasWithScope()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
        // Otherwise, forget the found property unless this is a scope callsite and the owner is a scope object as well.
        if (!NashornCallSiteDescriptor.isScope(desc) || !find.getOwner().isScope()) {
            find = null;
        }
    }

    if (find != null) {
        if (!find.getProperty().isWritable() && !NashornCallSiteDescriptor.isDeclaration(desc)) {
            if (NashornCallSiteDescriptor.isScope(desc) && find.getProperty().isLexicalBinding()) {
                throw typeError("assign.constant", name); // Overwriting ES6 const should throw also in non-strict mode.
            }
            // Existing, non-writable property
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "property.not.writable", true);
        }
    } else {
        if (!isExtensible()) {
            return createEmptySetMethod(desc, explicitInstanceOfCheck, "object.non.extensible", false);
        }
    }

    final GuardedInvocation inv = new SetMethodCreator(this, find, desc, request).createGuardedInvocation(findBuiltinSwitchPoint(name));

    final GlobalConstants globalConstants = getGlobalConstants();
    if (globalConstants != null) {
        final GuardedInvocation cinv = globalConstants.findSetMethod(find, this, inv, desc, request);
        if (cinv != null) {
            return cinv;
        }
    }

    return inv;
}
 

@Override
public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
    if (request.isCallSiteUnstable()) {
        // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
        return super.lookup(desc, request);
    }

    // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
    // necessity have a Nashorn descriptor - it is safe to cast.
    final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
    FindProperty find = null;
    GuardedInvocation link = null;
    ScriptObject self;

    final boolean isNamedOperation;
    final String name;
    if (desc.getNameTokenCount() > 2) {
        isNamedOperation = true;
        name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    } else {
        isNamedOperation = false;
        name = null;
    }

    self = expression;
    if (isNamedOperation) {
         find = self.findProperty(name, true);
    }

    if (find != null) {
        link = self.lookup(desc, request);
        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    final ScriptObject scope = getProto();
    if (isNamedOperation) {
        find = scope.findProperty(name, true);
    }

    if (find != null) {
        return fixScopeCallSite(scope.lookup(desc, request), name, find.getOwner());
    }

    // the property is not found - now check for
    // __noSuchProperty__ and __noSuchMethod__ in expression
    if (self != null) {
        final String fallBack;

        final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);

        switch (operator) {
        case "callMethod":
            throw new AssertionError(); // Nashorn never emits callMethod
        case "getMethod":
            fallBack = NO_SUCH_METHOD_NAME;
            break;
        case "getProp":
        case "getElem":
            fallBack = NO_SUCH_PROPERTY_NAME;
            break;
        default:
            fallBack = null;
            break;
        }

        if (fallBack != null) {
            find = self.findProperty(fallBack, true);
            if (find != null) {
                switch (operator) {
                case "getMethod":
                    link = self.noSuchMethod(desc, request);
                    break;
                case "getProp":
                case "getElem":
                    link = self.noSuchProperty(desc, request);
                    break;
                default:
                    break;
                }
            }
        }

        if (link != null) {
            return fixExpressionCallSite(ndesc, link);
        }
    }

    // still not found, may be scope can handle with it's own
    // __noSuchProperty__, __noSuchMethod__ etc.
    link = scope.lookup(desc, request);

    if (link != null) {
        return fixScopeCallSite(link, name, null);
    }

    return null;
}
 

/**
 * Find the appropriate SET method for an invoke dynamic call.
 *
 * @param desc    the call site descriptor
 * @param request the link request
 *
 * @return GuardedInvocation to be invoked at call site.
 */
protected GuardedInvocation findSetMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
    if(request.isCallSiteUnstable()) {
        return findMegaMorphicSetMethod(desc, name);
    }

    final boolean scope = isScope();
    /*
     * If doing property set on a scope object, we should stop proto search on the first
     * non-scope object. Without this, for example, when assigning "toString" on global scope,
     * we'll end up assigning it on it's proto - which is Object.prototype.toString !!
     *
     * toString = function() { print("global toString"); } // don't affect Object.prototype.toString
     */
    FindProperty find = findProperty(name, true, scope, this);

    // If it's not a scope search, then we don't want any inherited properties except those with user defined accessors.
    if (!scope && find != null && find.isInherited() && !(find.getProperty() instanceof UserAccessorProperty)) {
        // We should still check if inherited data property is not writable
        if (isExtensible() && !find.getProperty().isWritable()) {
            return createEmptySetMethod(desc, "property.not.writable", false);
        }
        // Otherwise, forget the found property
        find = null;
    }

    if (find != null) {
        if(!find.getProperty().isWritable()) {
            // Existing, non-writable property
            return createEmptySetMethod(desc, "property.not.writable", true);
        }
    } else {
        if (PROTO_PROPERTY_NAME.equals(name)) {
            return new GuardedInvocation(SETPROTOCHECK, NashornGuards.getScriptObjectGuard());
        } else if (! isExtensible()) {
            return createEmptySetMethod(desc, "object.non.extensible", false);
        }
    }

    return new SetMethodCreator(this, find, desc).createGuardedInvocation();
}