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Apache BCEL 6.5.0 Source Code Files
Apache BCEL Source Code Files are inside the Apache BCEL source package file like bcel-6.5.0-src.zip. Unzip the source package file and go to the "src/main" sub-directory, you will see source code files.
Here is the list of Java source code files of the Apache BCEL 6.5.0 in \Users\fyicenter\bcel-6.5.0\src:
✍: FYIcenter.com
⏎ org/apache/bcel/generic/ReferenceType.java
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ package org.apache.bcel.generic; import org.apache.bcel.Const; import org.apache.bcel.Repository; import org.apache.bcel.classfile.JavaClass; /** * Super class for object and array types. * */ public abstract class ReferenceType extends Type { protected ReferenceType(final byte t, final String s) { super(t, s); } /** Class is non-abstract but not instantiable from the outside */ ReferenceType() { super(Const.T_OBJECT, "<null object>"); } /** * Return true iff this type is castable to another type t as defined in * the JVM specification. The case where this is Type.NULL is not * defined (see the CHECKCAST definition in the JVM specification). * However, because e.g. CHECKCAST doesn't throw a * ClassCastException when casting a null reference to any Object, * true is returned in this case. * * @throws ClassNotFoundException if any classes or interfaces required * to determine assignment compatibility can't be found */ public boolean isCastableTo( final Type t ) throws ClassNotFoundException { if (this.equals(Type.NULL)) { return t instanceof ReferenceType; // If this is ever changed in isAssignmentCompatible() } return isAssignmentCompatibleWith(t); /* Yes, it's true: It's the same definition. * See vmspec2 AASTORE / CHECKCAST definitions. */ } /** * Return true iff this is assignment compatible with another type t * as defined in the JVM specification; see the AASTORE definition * there. * @throws ClassNotFoundException if any classes or interfaces required * to determine assignment compatibility can't be found */ public boolean isAssignmentCompatibleWith( final Type t ) throws ClassNotFoundException { if (!(t instanceof ReferenceType)) { return false; } final ReferenceType T = (ReferenceType) t; if (this.equals(Type.NULL)) { return true; // This is not explicitely stated, but clear. Isn't it? } /* If this is a class type then */ if ((this instanceof ObjectType) && (((ObjectType) this).referencesClassExact())) { /* If T is a class type, then this must be the same class as T, or this must be a subclass of T; */ if ((T instanceof ObjectType) && (((ObjectType) T).referencesClassExact())) { if (this.equals(T)) { return true; } if (Repository.instanceOf(((ObjectType) this).getClassName(), ((ObjectType) T) .getClassName())) { return true; } } /* If T is an interface type, this must implement interface T. */ if ((T instanceof ObjectType) && (((ObjectType) T).referencesInterfaceExact())) { if (Repository.implementationOf(((ObjectType) this).getClassName(), ((ObjectType) T).getClassName())) { return true; } } } /* If this is an interface type, then: */ if ((this instanceof ObjectType) && (((ObjectType) this).referencesInterfaceExact())) { /* If T is a class type, then T must be Object (�2.4.7). */ if ((T instanceof ObjectType) && (((ObjectType) T).referencesClassExact())) { if (T.equals(Type.OBJECT)) { return true; } } /* If T is an interface type, then T must be the same interface * as this or a superinterface of this (�2.13.2). */ if ((T instanceof ObjectType) && (((ObjectType) T).referencesInterfaceExact())) { if (this.equals(T)) { return true; } if (Repository.implementationOf(((ObjectType) this).getClassName(), ((ObjectType) T).getClassName())) { return true; } } } /* If this is an array type, namely, the type SC[], that is, an * array of components of type SC, then: */ if (this instanceof ArrayType) { /* If T is a class type, then T must be Object (�2.4.7). */ if ((T instanceof ObjectType) && (((ObjectType) T).referencesClassExact())) { if (T.equals(Type.OBJECT)) { return true; } } /* If T is an array type TC[], that is, an array of components * of type TC, then one of the following must be true: */ if (T instanceof ArrayType) { /* TC and SC are the same primitive type (�2.4.1). */ final Type sc = ((ArrayType) this).getElementType(); final Type tc = ((ArrayType) T).getElementType(); if (sc instanceof BasicType && tc instanceof BasicType && sc.equals(tc)) { return true; } /* TC and SC are reference types (�2.4.6), and type SC is * assignable to TC by these runtime rules. */ if (tc instanceof ReferenceType && sc instanceof ReferenceType && ((ReferenceType) sc).isAssignmentCompatibleWith(tc)) { return true; } } /* If T is an interface type, T must be one of the interfaces implemented by arrays (�2.15). */ // TODO: Check if this is still valid or find a way to dynamically find out which // interfaces arrays implement. However, as of the JVM specification edition 2, there // are at least two different pages where assignment compatibility is defined and // on one of them "interfaces implemented by arrays" is exchanged with "'Cloneable' or // 'java.io.Serializable'" if ((T instanceof ObjectType) && (((ObjectType) T).referencesInterfaceExact())) { for (final String element : Const.getInterfacesImplementedByArrays()) { if (T.equals(ObjectType.getInstance(element))) { return true; } } } } return false; // default. } /** * This commutative operation returns the first common superclass (narrowest ReferenceType * referencing a class, not an interface). * If one of the types is a superclass of the other, the former is returned. * If "this" is Type.NULL, then t is returned. * If t is Type.NULL, then "this" is returned. * If "this" equals t ['this.equals(t)'] "this" is returned. * If "this" or t is an ArrayType, then Type.OBJECT is returned; * unless their dimensions match. Then an ArrayType of the same * number of dimensions is returned, with its basic type being the * first common super class of the basic types of "this" and t. * If "this" or t is a ReferenceType referencing an interface, then Type.OBJECT is returned. * If not all of the two classes' superclasses cannot be found, "null" is returned. * See the JVM specification edition 2, "�4.9.2 The Bytecode Verifier". * * @throws ClassNotFoundException on failure to find superclasses of this * type, or the type passed as a parameter */ public ReferenceType getFirstCommonSuperclass( final ReferenceType t ) throws ClassNotFoundException { if (this.equals(Type.NULL)) { return t; } if (t.equals(Type.NULL)) { return this; } if (this.equals(t)) { return this; /* * TODO: Above sounds a little arbitrary. On the other hand, there is * no object referenced by Type.NULL so we can also say all the objects * referenced by Type.NULL were derived from java.lang.Object. * However, the Java Language's "instanceof" operator proves us wrong: * "null" is not referring to an instance of java.lang.Object :) */ } /* This code is from a bug report by Konstantin Shagin <konst@cs.technion.ac.il> */ if ((this instanceof ArrayType) && (t instanceof ArrayType)) { final ArrayType arrType1 = (ArrayType) this; final ArrayType arrType2 = (ArrayType) t; if ((arrType1.getDimensions() == arrType2.getDimensions()) && arrType1.getBasicType() instanceof ObjectType && arrType2.getBasicType() instanceof ObjectType) { return new ArrayType(((ObjectType) arrType1.getBasicType()) .getFirstCommonSuperclass((ObjectType) arrType2.getBasicType()), arrType1 .getDimensions()); } } if ((this instanceof ArrayType) || (t instanceof ArrayType)) { return Type.OBJECT; // TODO: Is there a proof of OBJECT being the direct ancestor of every ArrayType? } if (((this instanceof ObjectType) && ((ObjectType) this).referencesInterfaceExact()) || ((t instanceof ObjectType) && ((ObjectType) t).referencesInterfaceExact())) { return Type.OBJECT; // TODO: The above line is correct comparing to the vmspec2. But one could // make class file verification a bit stronger here by using the notion of // superinterfaces or even castability or assignment compatibility. } // this and t are ObjectTypes, see above. final ObjectType thiz = (ObjectType) this; final ObjectType other = (ObjectType) t; final JavaClass[] thiz_sups = Repository.getSuperClasses(thiz.getClassName()); final JavaClass[] other_sups = Repository.getSuperClasses(other.getClassName()); if ((thiz_sups == null) || (other_sups == null)) { return null; } // Waaahh... final JavaClass[] this_sups = new JavaClass[thiz_sups.length + 1]; final JavaClass[] t_sups = new JavaClass[other_sups.length + 1]; System.arraycopy(thiz_sups, 0, this_sups, 1, thiz_sups.length); System.arraycopy(other_sups, 0, t_sups, 1, other_sups.length); this_sups[0] = Repository.lookupClass(thiz.getClassName()); t_sups[0] = Repository.lookupClass(other.getClassName()); for (final JavaClass t_sup : t_sups) { for (final JavaClass this_sup : this_sups) { if (this_sup.equals(t_sup)) { return ObjectType.getInstance(this_sup.getClassName()); } } } // Huh? Did you ask for Type.OBJECT's superclass?? return null; } /** * This commutative operation returns the first common superclass (narrowest ReferenceType * referencing a class, not an interface). * If one of the types is a superclass of the other, the former is returned. * If "this" is Type.NULL, then t is returned. * If t is Type.NULL, then "this" is returned. * If "this" equals t ['this.equals(t)'] "this" is returned. * If "this" or t is an ArrayType, then Type.OBJECT is returned. * If "this" or t is a ReferenceType referencing an interface, then Type.OBJECT is returned. * If not all of the two classes' superclasses cannot be found, "null" is returned. * See the JVM specification edition 2, "�4.9.2 The Bytecode Verifier". * * @deprecated use getFirstCommonSuperclass(ReferenceType t) which has * slightly changed semantics. * @throws ClassNotFoundException on failure to find superclasses of this * type, or the type passed as a parameter */ @Deprecated public ReferenceType firstCommonSuperclass( final ReferenceType t ) throws ClassNotFoundException { if (this.equals(Type.NULL)) { return t; } if (t.equals(Type.NULL)) { return this; } if (this.equals(t)) { return this; /* * TODO: Above sounds a little arbitrary. On the other hand, there is * no object referenced by Type.NULL so we can also say all the objects * referenced by Type.NULL were derived from java.lang.Object. * However, the Java Language's "instanceof" operator proves us wrong: * "null" is not referring to an instance of java.lang.Object :) */ } if ((this instanceof ArrayType) || (t instanceof ArrayType)) { return Type.OBJECT; // TODO: Is there a proof of OBJECT being the direct ancestor of every ArrayType? } if (((this instanceof ObjectType) && ((ObjectType) this).referencesInterface()) || ((t instanceof ObjectType) && ((ObjectType) t).referencesInterface())) { return Type.OBJECT; // TODO: The above line is correct comparing to the vmspec2. But one could // make class file verification a bit stronger here by using the notion of // superinterfaces or even castability or assignment compatibility. } // this and t are ObjectTypes, see above. final ObjectType thiz = (ObjectType) this; final ObjectType other = (ObjectType) t; final JavaClass[] thiz_sups = Repository.getSuperClasses(thiz.getClassName()); final JavaClass[] other_sups = Repository.getSuperClasses(other.getClassName()); if ((thiz_sups == null) || (other_sups == null)) { return null; } // Waaahh... final JavaClass[] this_sups = new JavaClass[thiz_sups.length + 1]; final JavaClass[] t_sups = new JavaClass[other_sups.length + 1]; System.arraycopy(thiz_sups, 0, this_sups, 1, thiz_sups.length); System.arraycopy(other_sups, 0, t_sups, 1, other_sups.length); this_sups[0] = Repository.lookupClass(thiz.getClassName()); t_sups[0] = Repository.lookupClass(other.getClassName()); for (final JavaClass t_sup : t_sups) { for (final JavaClass this_sup : this_sups) { if (this_sup.equals(t_sup)) { return ObjectType.getInstance(this_sup.getClassName()); } } } // Huh? Did you ask for Type.OBJECT's superclass?? return null; } }
⏎ org/apache/bcel/generic/ReferenceType.java
Or download all of them as a single archive file:
File name: bcel-6.5.0-fyi.zip File size: 706792 bytes Release date: 2020-07-03 Download
⇐ Install Apache BCEL 6.5.0 Binary Package
2023-04-03, 28796👍, 5💬
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