Java NashornGuards类代码示例

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final Object value = getObjectValue(find);
    if (! (value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object thiz = scopeCall && func.isStrict() ? ScriptRuntime.UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    return new GuardedInvocation(MH.dropArguments(MH.constant(ScriptFunction.class,
            func.makeBoundFunction(thiz, new Object[] { name })), 0, Object.class),
            null, NashornGuards.getMapGuard(getMap()));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
@Override
protected GuardedInvocation findGetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final Object self = request.getReceiver();
    final Class<?> returnType = desc.getMethodType().returnType();

    if (returnType == Object.class && (self instanceof String || self instanceof ConsString)) {
        try {
            return new GuardedInvocation(MH.findStatic(MethodHandles.lookup(), NativeString.class, "get", desc.getMethodType()), NashornGuards.getInstanceOf2Guard(String.class, ConsString.class));
        } catch (final LookupException e) {
            //empty. Shouldn't happen. Fall back to super
        }
    }
    return super.findGetIndexMethod(desc, request);
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.makeBoundFunction(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
private GuardedInvocation createEmptyGetter(final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final String name) {
    if (NashornCallSiteDescriptor.isOptimistic(desc)) {
        throw new UnwarrantedOptimismException(UNDEFINED, NashornCallSiteDescriptor.getProgramPoint(desc), Type.OBJECT);
    }

    return new GuardedInvocation(Lookup.emptyGetter(desc.getMethodType().returnType()),
            NashornGuards.getMapGuard(getMap(), explicitInstanceOfCheck), getProtoSwitchPoint(name, null),
            explicitInstanceOfCheck ? null : ClassCastException.class);
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
private GuardedInvocation fixScopeCallSite(final GuardedInvocation link, final String name, final ScriptObject owner) {
    final GuardedInvocation newLink             = fixReceiverType(link, WITHSCOPEFILTER);
    final MethodHandle      expressionGuard     = expressionGuard(name, owner);
    final MethodHandle      filterGuardReceiver = filterGuardReceiver(newLink, WITHSCOPEFILTER);
    return link.replaceMethods(
            filterReceiver(
                    newLink.getInvocation(),
                    WITHSCOPEFILTER),
            NashornGuards.combineGuards(
                    expressionGuard,
                    filterGuardReceiver));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
/**
 * Composes from its components an actual guarded invocation that represents the dynamic setter method for the property.
 * @return the composed guarded invocation that represents the dynamic setter method for the property.
 */
GuardedInvocation createGuardedInvocation() {
    // getGuard() and getException() either both return null, or neither does. The reason for that is that now
    // getGuard returns a map guard that casts its argument to ScriptObject, and if that fails, we need to
    // relink on ClassCastException.
    final boolean explicitInstanceOfCheck = NashornGuards.explicitInstanceOfCheck(desc, request);
    return new GuardedInvocation(methodHandle, NashornGuards.getGuard(sobj, property, desc, explicitInstanceOfCheck),
            (SwitchPoint)null, explicitInstanceOfCheck ? null : ClassCastException.class);
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
@Override
protected GuardedInvocation findGetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final Object self = request.getReceiver();
    final Class<?> returnType = desc.getMethodType().returnType();

    if (returnType == Object.class && JSType.isString(self)) {
        try {
            return new GuardedInvocation(MH.findStatic(MethodHandles.lookup(), NativeString.class, "get", desc.getMethodType()), NashornGuards.getStringGuard());
        } catch (final LookupException e) {
            //empty. Shouldn't happen. Fall back to super
        }
    }
    return super.findGetIndexMethod(desc, request);
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = NashornCallSiteDescriptor.getOperand(desc);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request)
                // Add proto switchpoint to switch from no-such-property to no-such-method if it is ever defined.
                .addSwitchPoint(getProtoSwitchPoint(NO_SUCH_METHOD_NAME));
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)))
            // Add a protoype switchpoint for the original name so this gets invalidated if it is ever defined.
            .addSwitchPoint(getProtoSwitchPoint(name));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
private GuardedInvocation createEmptyGetter(final CallSiteDescriptor desc, final boolean explicitInstanceOfCheck, final String name) {
    if (NashornCallSiteDescriptor.isOptimistic(desc)) {
        throw new UnwarrantedOptimismException(UNDEFINED, NashornCallSiteDescriptor.getProgramPoint(desc), Type.OBJECT);
    }

    return new GuardedInvocation(Lookup.emptyGetter(desc.getMethodType().returnType()),
            NashornGuards.getMapGuard(getMap(), explicitInstanceOfCheck), getProtoSwitchPoints(name, null),
            explicitInstanceOfCheck ? null : ClassCastException.class);
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
private GuardedInvocation fixScopeCallSite(final GuardedInvocation link, final String name, final ScriptObject owner) {
    final GuardedInvocation newLink             = fixReceiverType(link, WITHSCOPEFILTER);
    final MethodHandle      expressionGuard     = expressionGuard(name, owner);
    final MethodHandle      filteredGuard       = filterGuardReceiver(newLink, WITHSCOPEFILTER);
    return link.replaceMethods(
            filterReceiver(
                    newLink.getInvocation(),
                    WITHSCOPEFILTER),
            NashornGuards.combineGuards(
                    expressionGuard,
                    filteredGuard));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = NashornCallSiteDescriptor.getOperand(desc);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
@Override
protected GuardedInvocation findGetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final Object self = request.getReceiver();
    final Class<?> returnType = desc.getMethodType().returnType();

    if (returnType == Object.class && JSType.isString(self)) {
        try {
            return new GuardedInvocation(MH.findStatic(MethodHandles.lookup(), NativeString.class, "get", desc.getMethodType()), NashornGuards.getInstanceOf2Guard(String.class, ConsString.class));
        } catch (final LookupException e) {
            //empty. Shouldn't happen. Fall back to super
        }
    }
    return super.findGetIndexMethod(desc, request);
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
/**
 * Fall back if a function property is not found.
 * @param desc The call site descriptor
 * @param request the link request
 * @return GuardedInvocation to be invoked at call site.
 */
public GuardedInvocation noSuchMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final String       name      = desc.getNameToken(2);
    final FindProperty find      = findProperty(NO_SUCH_METHOD_NAME, true);
    final boolean      scopeCall = isScope() && NashornCallSiteDescriptor.isScope(desc);

    if (find == null) {
        return noSuchProperty(desc, request);
    }

    final boolean explicitInstanceOfCheck = explicitInstanceOfCheck(desc, request);

    final Object value = find.getObjectValue();
    if (!(value instanceof ScriptFunction)) {
        return createEmptyGetter(desc, explicitInstanceOfCheck, name);
    }

    final ScriptFunction func = (ScriptFunction)value;
    final Object         thiz = scopeCall && func.isStrict() ? UNDEFINED : this;
    // TODO: It'd be awesome if we could bind "name" without binding "this".
    // Since we're binding this we must use an identity guard here.
    return new GuardedInvocation(
            MH.dropArguments(
                    MH.constant(
                            ScriptFunction.class,
                            func.createBound(thiz, new Object[] { name })),
                    0,
                    Object.class),
            NashornGuards.combineGuards(
                    NashornGuards.getIdentityGuard(this),
                    NashornGuards.getMapGuard(getMap(), true)));
}
 

import jdk.nashorn.internal.runtime.linker.NashornGuards; //导入依赖的package包/类
@Override
protected GuardedInvocation findGetIndexMethod(final CallSiteDescriptor desc, final LinkRequest request) {
    final Object self = request.getReceiver();
    final Class<?> returnType = desc.getMethodType().returnType();

    if (returnType == Object.class && (self instanceof String || self instanceof ConsString)) {
        try {
            MethodHandle mh = MH.findStatic(MethodHandles.lookup(), NativeString.class, "get", desc.getMethodType());
            return new GuardedInvocation(mh, NashornGuards.getInstanceOf2Guard(String.class, ConsString.class));
        } catch (final LookupException e) {
            // Shouldn't happen. Fall back to super
        }
    }
    return super.findGetIndexMethod(desc, request);
}