Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/ResolvedJavaType.java @ 23985:05922ce51c5e
Restore extra level of weakness in the ResolvedJavaType cache
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 23 Jan 2017 15:50:05 -0800 |
parents | d6bd0b9cd0b6 |
children | 6d70d9c43369 |
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/* * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.vm.ci.meta; import java.lang.reflect.AnnotatedElement; import jdk.vm.ci.meta.Assumptions.AssumptionResult; /** * Represents a resolved Java type. Types include primitives, objects, {@code void}, and arrays * thereof. Types, like fields and methods, are resolved through {@link ConstantPool constant pools} * . */ public interface ResolvedJavaType extends JavaType, ModifiersProvider, AnnotatedElement { /** * Checks whether this type has a finalizer method. * * @return {@code true} if this class has a finalizer */ boolean hasFinalizer(); /** * Checks whether this type has any finalizable subclasses so far. Any decisions based on this * information require the registration of a dependency, since this information may change. * * @return {@code true} if this class has any subclasses with finalizers */ AssumptionResult<Boolean> hasFinalizableSubclass(); /** * Checks whether this type is an interface. * * @return {@code true} if this type is an interface */ boolean isInterface(); /** * Checks whether this type is an instance class. * * @return {@code true} if this type is an instance class */ boolean isInstanceClass(); /** * Checks whether this type is primitive. * * @return {@code true} if this type is primitive */ boolean isPrimitive(); /* * The setting of the final bit for types is a bit confusing since arrays are marked as final. * This method provides a semantically equivalent test that appropriate for types. */ default boolean isLeaf() { return getElementalType().isFinalFlagSet(); } /** * Checks whether this type is initialized. If a type is initialized it implies that it was * {@link #isLinked() linked} and that the static initializer has run. * * @return {@code true} if this type is initialized */ boolean isInitialized(); /** * Initializes this type. */ void initialize(); /** * Checks whether this type is linked and verified. When a type is linked the static initializer * has not necessarily run. An {@link #isInitialized() initialized} type is always linked. * * @return {@code true} if this type is linked */ boolean isLinked(); /** * Determines if this type is either the same as, or is a superclass or superinterface of, the * type represented by the specified parameter. This method is identical to * {@link Class#isAssignableFrom(Class)} in terms of the value return for this type. */ boolean isAssignableFrom(ResolvedJavaType other); /** * Returns true if this type is exactly the type {@link java.lang.Object}. */ default boolean isJavaLangObject() { // Removed assertion due to https://bugs.eclipse.org/bugs/show_bug.cgi?id=434442 return getSuperclass() == null && !isInterface() && getJavaKind() == JavaKind.Object; } /** * Checks whether the specified object is an instance of this type. * * @param obj the object to test * @return {@code true} if the object is an instance of this type */ boolean isInstance(JavaConstant obj); /** * Gets the super class of this type. If this type represents either the {@code Object} class, * an interface, a primitive type, or void, then null is returned. If this object represents an * array class then the type object representing the {@code Object} class is returned. */ ResolvedJavaType getSuperclass(); /** * Gets the interfaces implemented or extended by this type. This method is analogous to * {@link Class#getInterfaces()} and as such, only returns the interfaces directly implemented * or extended by this type. */ ResolvedJavaType[] getInterfaces(); /** * Gets the single implementor of this type. Calling this method on a non-interface type causes * an exception. * <p> * If the compiler uses the result of this method for its compilation, the usage must be guarded * because the verifier can not guarantee that the assigned type really implements this * interface. Additionally, class loading can invalidate the result of this method. * * @return {@code null} if there is no implementor, the implementor if there is only one, or * {@code this} if there are more than one. */ ResolvedJavaType getSingleImplementor(); /** * Walks the class hierarchy upwards and returns the least common class that is a superclass of * both the current and the given type. * * @return the least common type that is a super type of both the current and the given type, or * {@code null} if primitive types are involved. */ ResolvedJavaType findLeastCommonAncestor(ResolvedJavaType otherType); /** * Attempts to get a leaf concrete subclass of this type. * <p> * For an {@linkplain #isArray() array} type A, the leaf concrete subclass is A if the * {@linkplain #getElementalType() elemental} type of A is final (which includes primitive * types). Otherwise {@code null} is returned for A. * <p> * For a non-array type T, the result is the leaf concrete type in the current hierarchy of T. * <p> * A runtime may decide not to manage or walk a large hierarchy and so the result is * conservative. That is, a non-null result is guaranteed to be the leaf concrete class in T's * hierarchy <b>at the current point in time</b> but a null result does not necessarily imply * that there is no leaf concrete class in T's hierarchy. * <p> * If the compiler uses the result of this method for its compilation, it must register the * {@link AssumptionResult} in its {@link Assumptions} because dynamic class loading can * invalidate the result of this method. * * @return an {@link AssumptionResult} containing the leaf concrete subclass for this type as * described above */ AssumptionResult<ResolvedJavaType> findLeafConcreteSubtype(); ResolvedJavaType getComponentType(); default ResolvedJavaType getElementalType() { ResolvedJavaType t = this; while (t.isArray()) { t = t.getComponentType(); } return t; } ResolvedJavaType getArrayClass(); /** * Resolves the method implementation for virtual dispatches on objects of this dynamic type. * This resolution process only searches "up" the class hierarchy of this type. A broader search * that also walks "down" the hierarchy is implemented by * {@link #findUniqueConcreteMethod(ResolvedJavaMethod)}. For interface types it returns null * since no concrete object can be an interface. * * @param method the method to select the implementation of * @param callerType the caller or context type used to perform access checks * @return the method that would be selected at runtime (might be abstract) or {@code null} if * it can not be resolved */ ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method, ResolvedJavaType callerType); /** * A convenience wrapper for {@link #resolveMethod(ResolvedJavaMethod, ResolvedJavaType)} that * only returns non-abstract methods. * * @param method the method to select the implementation of * @param callerType the caller or context type used to perform access checks * @return the concrete method that would be selected at runtime, or {@code null} if there is no * concrete implementation of {@code method} in this type or any of its superclasses */ default ResolvedJavaMethod resolveConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType callerType) { ResolvedJavaMethod resolvedMethod = resolveMethod(method, callerType); if (resolvedMethod == null || resolvedMethod.isAbstract()) { return null; } return resolvedMethod; } /** * Given a {@link ResolvedJavaMethod} A, returns a concrete {@link ResolvedJavaMethod} B that is * the only possible unique target for a virtual call on A(). Returns {@code null} if either no * such concrete method or more than one such method exists. Returns the method A if A is a * concrete method that is not overridden. * <p> * If the compiler uses the result of this method for its compilation, it must register an * assumption because dynamic class loading can invalidate the result of this method. * * @param method the method A for which a unique concrete target is searched * @return the unique concrete target or {@code null} if no such target exists or assumptions * are not supported by this runtime */ AssumptionResult<ResolvedJavaMethod> findUniqueConcreteMethod(ResolvedJavaMethod method); /** * Returns the instance fields of this class, including * {@linkplain ResolvedJavaField#isInternal() internal} fields. A zero-length array is returned * for array and primitive types. The order of fields returned by this method is stable. That * is, for a single JVM execution the same order is returned each time this method is called. It * is also the "natural" order, which means that the JVM would expect the fields in this order * if no specific order is given. * * @param includeSuperclasses if true, then instance fields for the complete hierarchy of this * type are included in the result * @return an array of instance fields */ ResolvedJavaField[] getInstanceFields(boolean includeSuperclasses); /** * Returns the static fields of this class, including {@linkplain ResolvedJavaField#isInternal() * internal} fields. A zero-length array is returned for array and primitive types. The order of * fields returned by this method is stable. That is, for a single JVM execution the same order * is returned each time this method is called. */ ResolvedJavaField[] getStaticFields(); /** * Returns the instance field of this class (or one of its super classes) at the given offset, * or {@code null} if there is no such field. * * @param offset the offset of the field to look for * @return the field with the given offset, or {@code null} if there is no such field. */ ResolvedJavaField findInstanceFieldWithOffset(long offset, JavaKind expectedKind); /** * Returns name of source file of this type. */ String getSourceFileName(); /** * Returns {@code true} if the type is a local type. */ boolean isLocal(); /** * Returns {@code true} if the type is a member type. */ boolean isMember(); /** * Returns the enclosing type of this type, if it exists, or {@code null}. */ ResolvedJavaType getEnclosingType(); /** * Returns an array reflecting all the constructors declared by this type. This method is * similar to {@link Class#getDeclaredConstructors()} in terms of returned constructors. */ ResolvedJavaMethod[] getDeclaredConstructors(); /** * Returns an array reflecting all the methods declared by this type. This method is similar to * {@link Class#getDeclaredMethods()} in terms of returned methods. */ ResolvedJavaMethod[] getDeclaredMethods(); /** * Returns the {@code <clinit>} method for this class if there is one. */ ResolvedJavaMethod getClassInitializer(); default ResolvedJavaMethod findMethod(String name, Signature signature) { for (ResolvedJavaMethod method : getDeclaredMethods()) { if (method.getName().equals(name) && method.getSignature().equals(signature)) { return method; } } return null; } /** * Returns true if this type is {@link Cloneable} and can be safely cloned by creating a normal * Java allocation and populating it from the fields returned by * {@link #getInstanceFields(boolean)}. Some types may require special handling by the platform * so they would to go through the normal {@link Object#clone} path. */ boolean isCloneableWithAllocation(); }