| /* |
| * Copyright (c) 2008, 2012, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 com.sun.tools.classfile; |
| |
| import java.util.Map; |
| |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Double_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Fieldref_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Float_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Integer_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_InterfaceMethodref_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Long_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodType_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_NameAndType_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info; |
| import com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info; |
| import com.sun.tools.classfile.ConstantPool.CPInfo; |
| |
| /** |
| * Rewrites a class file using a map of translations. |
| * |
| * <p><b>This is NOT part of any supported API. |
| * If you write code that depends on this, you do so at your own risk. |
| * This code and its internal interfaces are subject to change or |
| * deletion without notice.</b> |
| */ |
| public class ClassTranslator |
| implements ConstantPool.Visitor<ConstantPool.CPInfo,Map<Object,Object>> { |
| /** |
| * Create a new ClassFile from {@code cf}, such that for all entries |
| * {@code k -\> v} in {@code translations}, |
| * each occurrence of {@code k} in {@code cf} will be replaced by {@code v}. |
| * in |
| * @param cf the class file to be processed |
| * @param translations the set of translations to be applied |
| * @return a copy of {@code} with the values in {@code translations} substituted |
| */ |
| public ClassFile translate(ClassFile cf, Map<Object,Object> translations) { |
| ClassFile cf2 = (ClassFile) translations.get(cf); |
| if (cf2 == null) { |
| ConstantPool constant_pool2 = translate(cf.constant_pool, translations); |
| Field[] fields2 = translate(cf.fields, cf.constant_pool, translations); |
| Method[] methods2 = translateMethods(cf.methods, cf.constant_pool, translations); |
| Attributes attributes2 = translateAttributes(cf.attributes, cf.constant_pool, |
| translations); |
| |
| if (constant_pool2 == cf.constant_pool && |
| fields2 == cf.fields && |
| methods2 == cf.methods && |
| attributes2 == cf.attributes) |
| cf2 = cf; |
| else |
| cf2 = new ClassFile( |
| cf.magic, |
| cf.minor_version, |
| cf.major_version, |
| constant_pool2, |
| cf.access_flags, |
| cf.this_class, |
| cf.super_class, |
| cf.interfaces, |
| fields2, |
| methods2, |
| attributes2); |
| translations.put(cf, cf2); |
| } |
| return cf2; |
| } |
| |
| ConstantPool translate(ConstantPool cp, Map<Object,Object> translations) { |
| ConstantPool cp2 = (ConstantPool) translations.get(cp); |
| if (cp2 == null) { |
| ConstantPool.CPInfo[] pool2 = new ConstantPool.CPInfo[cp.size()]; |
| boolean eq = true; |
| for (int i = 0; i < cp.size(); ) { |
| ConstantPool.CPInfo cpInfo; |
| try { |
| cpInfo = cp.get(i); |
| } catch (ConstantPool.InvalidIndex e) { |
| throw new IllegalStateException(e); |
| } |
| ConstantPool.CPInfo cpInfo2 = translate(cpInfo, translations); |
| eq &= (cpInfo == cpInfo2); |
| pool2[i] = cpInfo2; |
| if (cpInfo.getTag() != cpInfo2.getTag()) |
| throw new IllegalStateException(); |
| i += cpInfo.size(); |
| } |
| |
| if (eq) |
| cp2 = cp; |
| else |
| cp2 = new ConstantPool(pool2); |
| |
| translations.put(cp, cp2); |
| } |
| return cp2; |
| } |
| |
| ConstantPool.CPInfo translate(ConstantPool.CPInfo cpInfo, Map<Object,Object> translations) { |
| ConstantPool.CPInfo cpInfo2 = (ConstantPool.CPInfo) translations.get(cpInfo); |
| if (cpInfo2 == null) { |
| cpInfo2 = cpInfo.accept(this, translations); |
| translations.put(cpInfo, cpInfo2); |
| } |
| return cpInfo2; |
| } |
| |
| Field[] translate(Field[] fields, ConstantPool constant_pool, Map<Object,Object> translations) { |
| Field[] fields2 = (Field[]) translations.get(fields); |
| if (fields2 == null) { |
| fields2 = new Field[fields.length]; |
| for (int i = 0; i < fields.length; i++) |
| fields2[i] = translate(fields[i], constant_pool, translations); |
| if (equal(fields, fields2)) |
| fields2 = fields; |
| translations.put(fields, fields2); |
| } |
| return fields2; |
| } |
| |
| Field translate(Field field, ConstantPool constant_pool, Map<Object,Object> translations) { |
| Field field2 = (Field) translations.get(field); |
| if (field2 == null) { |
| Attributes attributes2 = translateAttributes(field.attributes, constant_pool, |
| translations); |
| |
| if (attributes2 == field.attributes) |
| field2 = field; |
| else |
| field2 = new Field( |
| field.access_flags, |
| field.name_index, |
| field.descriptor, |
| attributes2); |
| translations.put(field, field2); |
| } |
| return field2; |
| } |
| |
| Method[] translateMethods(Method[] methods, ConstantPool constant_pool, Map<Object,Object> translations) { |
| Method[] methods2 = (Method[]) translations.get(methods); |
| if (methods2 == null) { |
| methods2 = new Method[methods.length]; |
| for (int i = 0; i < methods.length; i++) |
| methods2[i] = translate(methods[i], constant_pool, translations); |
| if (equal(methods, methods2)) |
| methods2 = methods; |
| translations.put(methods, methods2); |
| } |
| return methods2; |
| } |
| |
| Method translate(Method method, ConstantPool constant_pool, Map<Object,Object> translations) { |
| Method method2 = (Method) translations.get(method); |
| if (method2 == null) { |
| Attributes attributes2 = translateAttributes(method.attributes, constant_pool, |
| translations); |
| |
| if (attributes2 == method.attributes) |
| method2 = method; |
| else |
| method2 = new Method( |
| method.access_flags, |
| method.name_index, |
| method.descriptor, |
| attributes2); |
| translations.put(method, method2); |
| } |
| return method2; |
| } |
| |
| Attributes translateAttributes(Attributes attributes, |
| ConstantPool constant_pool, Map<Object,Object> translations) { |
| Attributes attributes2 = (Attributes) translations.get(attributes); |
| if (attributes2 == null) { |
| Attribute[] attrArray2 = new Attribute[attributes.size()]; |
| ConstantPool constant_pool2 = translate(constant_pool, translations); |
| boolean attrsEqual = true; |
| for (int i = 0; i < attributes.size(); i++) { |
| Attribute attr = attributes.get(i); |
| Attribute attr2 = translate(attr, translations); |
| if (attr2 != attr) |
| attrsEqual = false; |
| attrArray2[i] = attr2; |
| } |
| if ((constant_pool2 == constant_pool) && attrsEqual) |
| attributes2 = attributes; |
| else |
| attributes2 = new Attributes(constant_pool2, attrArray2); |
| translations.put(attributes, attributes2); |
| } |
| return attributes2; |
| } |
| |
| Attribute translate(Attribute attribute, Map<Object,Object> translations) { |
| Attribute attribute2 = (Attribute) translations.get(attribute); |
| if (attribute2 == null) { |
| attribute2 = attribute; // don't support translation within attributes yet |
| // (what about Code attribute) |
| translations.put(attribute, attribute2); |
| } |
| return attribute2; |
| } |
| |
| private static <T> boolean equal(T[] a1, T[] a2) { |
| if (a1 == null || a2 == null) |
| return (a1 == a2); |
| if (a1.length != a2.length) |
| return false; |
| for (int i = 0; i < a1.length; i++) { |
| if (a1[i] != a2[i]) |
| return false; |
| } |
| return true; |
| } |
| |
| public CPInfo visitClass(CONSTANT_Class_info info, Map<Object, Object> translations) { |
| CONSTANT_Class_info info2 = (CONSTANT_Class_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) |
| info2 = info; |
| else |
| info2 = new CONSTANT_Class_info(cp2, info.name_index); |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitDouble(CONSTANT_Double_info info, Map<Object, Object> translations) { |
| CONSTANT_Double_info info2 = (CONSTANT_Double_info) translations.get(info); |
| if (info2 == null) { |
| info2 = info; |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitFieldref(CONSTANT_Fieldref_info info, Map<Object, Object> translations) { |
| CONSTANT_Fieldref_info info2 = (CONSTANT_Fieldref_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) |
| info2 = info; |
| else |
| info2 = new CONSTANT_Fieldref_info(cp2, info.class_index, info.name_and_type_index); |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitFloat(CONSTANT_Float_info info, Map<Object, Object> translations) { |
| CONSTANT_Float_info info2 = (CONSTANT_Float_info) translations.get(info); |
| if (info2 == null) { |
| info2 = info; |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitInteger(CONSTANT_Integer_info info, Map<Object, Object> translations) { |
| CONSTANT_Integer_info info2 = (CONSTANT_Integer_info) translations.get(info); |
| if (info2 == null) { |
| info2 = info; |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Map<Object, Object> translations) { |
| CONSTANT_InterfaceMethodref_info info2 = (CONSTANT_InterfaceMethodref_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) |
| info2 = info; |
| else |
| info2 = new CONSTANT_InterfaceMethodref_info(cp2, info.class_index, info.name_and_type_index); |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Map<Object, Object> translations) { |
| CONSTANT_InvokeDynamic_info info2 = (CONSTANT_InvokeDynamic_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) { |
| info2 = info; |
| } else { |
| info2 = new CONSTANT_InvokeDynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index); |
| } |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitLong(CONSTANT_Long_info info, Map<Object, Object> translations) { |
| CONSTANT_Long_info info2 = (CONSTANT_Long_info) translations.get(info); |
| if (info2 == null) { |
| info2 = info; |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitNameAndType(CONSTANT_NameAndType_info info, Map<Object, Object> translations) { |
| CONSTANT_NameAndType_info info2 = (CONSTANT_NameAndType_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) |
| info2 = info; |
| else |
| info2 = new CONSTANT_NameAndType_info(cp2, info.name_index, info.type_index); |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitMethodref(CONSTANT_Methodref_info info, Map<Object, Object> translations) { |
| CONSTANT_Methodref_info info2 = (CONSTANT_Methodref_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) |
| info2 = info; |
| else |
| info2 = new CONSTANT_Methodref_info(cp2, info.class_index, info.name_and_type_index); |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitMethodHandle(CONSTANT_MethodHandle_info info, Map<Object, Object> translations) { |
| CONSTANT_MethodHandle_info info2 = (CONSTANT_MethodHandle_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) { |
| info2 = info; |
| } else { |
| info2 = new CONSTANT_MethodHandle_info(cp2, info.reference_kind, info.reference_index); |
| } |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitMethodType(CONSTANT_MethodType_info info, Map<Object, Object> translations) { |
| CONSTANT_MethodType_info info2 = (CONSTANT_MethodType_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) { |
| info2 = info; |
| } else { |
| info2 = new CONSTANT_MethodType_info(cp2, info.descriptor_index); |
| } |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitString(CONSTANT_String_info info, Map<Object, Object> translations) { |
| CONSTANT_String_info info2 = (CONSTANT_String_info) translations.get(info); |
| if (info2 == null) { |
| ConstantPool cp2 = translate(info.cp, translations); |
| if (cp2 == info.cp) |
| info2 = info; |
| else |
| info2 = new CONSTANT_String_info(cp2, info.string_index); |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| public CPInfo visitUtf8(CONSTANT_Utf8_info info, Map<Object, Object> translations) { |
| CONSTANT_Utf8_info info2 = (CONSTANT_Utf8_info) translations.get(info); |
| if (info2 == null) { |
| info2 = info; |
| translations.put(info, info2); |
| } |
| return info; |
| } |
| |
| } |
