Java Code Examples for jdk.nashorn.internal.runtime.Property#canChangeType()

The following examples show how to use jdk.nashorn.internal.runtime.Property#canChangeType() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: NashornGuards.java    From TencentKona-8 with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc)) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 2
Source File: NashornGuards.java    From jdk8u60 with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc)) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 3
Source File: NashornGuards.java    From openjdk-jdk8u with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc)) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 4
Source File: NashornGuards.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc)) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 5
Source File: NashornGuards.java    From openjdk-jdk9 with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc) && sobj.isScope()) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 6
Source File: NashornGuards.java    From hottub with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc)) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 7
Source File: NashornGuards.java    From jdk8u_nashorn with GNU General Public License v2.0 6 votes vote down vote up 
/**
 * Get the guard for a property access. This returns an identity guard for non-configurable global properties
 * and a map guard for everything else.
 *
 * @param sobj the first object in the prototype chain
 * @param property the property
 * @param desc the callsite descriptor
 * @param explicitInstanceOfCheck true if we should do an explicit script object instanceof check instead of just casting
 * @return method handle for guard
 */
public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck) {
    if (!needsGuard(property, desc)) {
        return null;
    }
    if (NashornCallSiteDescriptor.isScope(desc)) {
        if (property != null && property.isBound() && !property.canChangeType()) {
            // This is a declared top level variables in main script or eval, use identity guard.
            return getIdentityGuard(sobj);
        }
        if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
            // Undeclared variables in nested evals need stronger guards
            return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap(), explicitInstanceOfCheck));
        }
    }
    return getMapGuard(sobj.getMap(), explicitInstanceOfCheck);
}
Example 8
Source File: NashornGuards.java    From TencentKona-8 with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}
Example 9
Source File: NashornGuards.java    From jdk8u60 with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}
Example 10
Source File: NashornGuards.java    From openjdk-jdk8u with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}
Example 11
Source File: NashornGuards.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}
Example 12
Source File: NashornGuards.java    From openjdk-jdk9 with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}
Example 13
Source File: NashornGuards.java    From hottub with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}
Example 14
Source File: NashornGuards.java    From jdk8u_nashorn with GNU General Public License v2.0 2 votes vote down vote up 
/**
 * Determine whether the given callsite needs a guard.
 * @param property the property, or null
 * @param desc the callsite descriptor
 * @return true if a guard should be used for this callsite
 */
static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
    return property == null || property.isConfigurable()
            || property.isBound() || property.hasDualFields()
            || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
}