Java AssumptionResult.canRecordTo方法代碼示例

import jdk.vm.ci.meta.Assumptions.AssumptionResult; //導入方法依賴的package包/類
public static ResolvedJavaMethod devirtualizeCall(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ResolvedJavaType contextType, Assumptions assumptions, Stamp receiverStamp) {
    TypeReference type = StampTool.typeReferenceOrNull(receiverStamp);
    if (type == null && invokeKind == InvokeKind.Virtual) {
        // For virtual calls, we are guaranteed to receive a correct receiver type.
        type = TypeReference.createTrusted(assumptions, targetMethod.getDeclaringClass());
    }

    if (type != null) {
        /*
         * either the holder class is exact, or the receiver object has an exact type, or it's
         * an array type
         */
        ResolvedJavaMethod resolvedMethod = type.getType().resolveConcreteMethod(targetMethod, contextType);
        if (resolvedMethod != null && (resolvedMethod.canBeStaticallyBound() || type.isExact() || type.getType().isArray())) {
            return resolvedMethod;
        }

        AssumptionResult<ResolvedJavaMethod> uniqueConcreteMethod = type.getType().findUniqueConcreteMethod(targetMethod);
        if (uniqueConcreteMethod != null && uniqueConcreteMethod.canRecordTo(assumptions)) {
            uniqueConcreteMethod.recordTo(assumptions);
            return uniqueConcreteMethod.getResult();
        }
    }
    return null;
}
 

import jdk.vm.ci.meta.Assumptions.AssumptionResult; //導入方法依賴的package包/類
@Override
public Node canonical(CanonicalizerTool tool) {
    if (hub instanceof LoadHubNode) {
        ValueNode object = ((LoadHubNode) hub).getValue();
        TypeReference type = StampTool.typeReferenceOrNull(object);
        if (type != null) {
            if (type.isExact()) {
                return resolveExactMethod(tool, type.getType());
            }
            Assumptions assumptions = graph().getAssumptions();
            AssumptionResult<ResolvedJavaMethod> resolvedMethod = type.getType().findUniqueConcreteMethod(method);
            if (resolvedMethod != null && resolvedMethod.canRecordTo(assumptions) && !type.getType().isInterface() && method.getDeclaringClass().isAssignableFrom(type.getType())) {
                resolvedMethod.recordTo(assumptions);
                return ConstantNode.forConstant(stamp(), resolvedMethod.getResult().getEncoding(), tool.getMetaAccess());
            }
        }
    }
    if (hub.isConstant()) {
        return resolveExactMethod(tool, tool.getConstantReflection().asJavaType(hub.asConstant()));
    }

    return this;
}
 

import jdk.vm.ci.meta.Assumptions.AssumptionResult; //導入方法依賴的package包/類
@Override
public ValueNode canonicalizeRead(ValueNode read, AddressNode location, ValueNode object, CanonicalizerTool tool) {
    ValueNode javaObject = findReadHub(object);
    if (javaObject != null) {
        ResolvedJavaType type = StampTool.typeOrNull(javaObject);
        if (type != null && type.isArray()) {
            ResolvedJavaType element = type.getComponentType();
            if (element != null && !element.isPrimitive() && !element.getElementalType().isInterface()) {
                Assumptions assumptions = object.graph().getAssumptions();
                AssumptionResult<ResolvedJavaType> leafType = element.findLeafConcreteSubtype();
                if (leafType != null && leafType.canRecordTo(assumptions)) {
                    leafType.recordTo(assumptions);
                    return ConstantNode.forConstant(read.stamp(), tool.getConstantReflection().asObjectHub(leafType.getResult()), tool.getMetaAccess());
                }
            }
        }
    }
    return read;
}
 

import jdk.vm.ci.meta.Assumptions.AssumptionResult; //導入方法依賴的package包/類
/**
 * Determines if the compiler should emit code to test whether a given object has a finalizer
 * that must be registered with the runtime upon object initialization.
 */
public static boolean mayHaveFinalizer(ValueNode object, Assumptions assumptions) {
    ObjectStamp objectStamp = (ObjectStamp) object.stamp();
    if (objectStamp.isExactType()) {
        return objectStamp.type().hasFinalizer();
    } else if (objectStamp.type() != null) {
        AssumptionResult<Boolean> result = objectStamp.type().hasFinalizableSubclass();
        if (result.canRecordTo(assumptions)) {
            result.recordTo(assumptions);
            return result.getResult();
        }
    }
    return true;
}