--- /dev/null 2015-09-16 15:21:00.000000000 -0700 +++ new/src/java.base/share/classes/jdk.internal.jvmci.meta/src/jdk/internal/jvmci/meta/ResolvedJavaType.java 2015-09-16 15:21:00.000000000 -0700 @@ -0,0 +1,372 @@ +/* + * 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.internal.jvmci.meta; + +import java.lang.annotation.*; +import java.net.*; + +import jdk.internal.jvmci.meta.Assumptions.*; + +/** + * 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 { + /** + * Gets the runtime representation of the Java class object of this type. + */ + JavaConstant getJavaClass(); + + /** + * Gets the runtime representation of the "hub" of this type--that is, the closest part of the + * type representation which is typically stored in the object header. + */ + Constant getObjectHub(); + + /** + * 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 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 an array class. + * + * @return {@code true} if this type is an array class + */ + boolean isArray(); + + /** + * Checks whether this type is primitive. + * + * @return {@code true} if this type is primitive + */ + boolean isPrimitive(); + + /** + * {@inheritDoc} + *

+ * Only the flags specified in the JVM specification will be included in the returned mask. This + * method is identical to {@link Class#getModifiers()} in terms of the value return for this + * type. + */ + int getModifiers(); + + /* + * 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); + + /** + * Returns this type if it is an exact type otherwise returns null. This type is exact if it is + * void, primitive, final, or an array of a final or primitive type. + * + * @return this type if it is exact; {@code null} otherwise + */ + ResolvedJavaType asExactType(); + + /** + * 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. + *

+ * 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. + *

+ * 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. + *

+ * For a non-array type T, the result is the leaf concrete type in the current hierarchy of T. + *

+ * 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 at the current point in time but a null result does not necessarily imply + * that there is no leaf concrete class in T's hierarchy. + *

+ * 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 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. + * + * @param method the method to select the implementation of + * @param callerType the caller or context type used to perform access checks + * @return the link-time resolved method (might be abstract) or {@code null} if it can not be + * linked + */ + ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method, ResolvedJavaType callerType); + + /** + * 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)}. + * + * @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 + */ + ResolvedJavaMethod resolveConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType callerType); + + /** + * 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. + *

+ * 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 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 all annotations of this class. If no annotations are present, an array of length 0 is + * returned. + */ + Annotation[] getAnnotations(); + + /** + * Returns the annotation for the specified type of this class, if such an annotation is + * present. + * + * @param annotationClass the Class object corresponding to the annotation type + * @return this element's annotation for the specified annotation type if present on this class, + * else {@code null} + */ + T getAnnotation(Class annotationClass); + + /** + * 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 the class file path - if available - of this type, or {@code null}. + */ + URL getClassFilePath(); + + /** + * 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 } method for this class if there is one. + */ + ResolvedJavaMethod getClassInitializer(); + + /** + * Returns true if this type represents an interface and it should be trusted even in places + * where the JVM verifier would not give any guarantees other than {@link Object}. + */ + boolean isTrustedInterfaceType(); + + default ResolvedJavaMethod findMethod(String name, Signature signature) { + for (ResolvedJavaMethod method : getDeclaredMethods()) { + if (method.getName().equals(name) && method.getSignature().equals(signature)) { + return method; + } + } + return null; + } +}