jjg@46: /*
jjg@1357: * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
jjg@46: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@46: *
jjg@46: * This code is free software; you can redistribute it and/or modify it
jjg@46: * under the terms of the GNU General Public License version 2 only, as
ohair@554: * published by the Free Software Foundation. Oracle designates this
jjg@46: * particular file as subject to the "Classpath" exception as provided
ohair@554: * by Oracle in the LICENSE file that accompanied this code.
jjg@46: *
jjg@46: * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@46: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@46: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
jjg@46: * version 2 for more details (a copy is included in the LICENSE file that
jjg@46: * accompanied this code).
jjg@46: *
jjg@46: * You should have received a copy of the GNU General Public License version
jjg@46: * 2 along with this work; if not, write to the Free Software Foundation,
jjg@46: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@46: *
ohair@554: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554: * or visit www.oracle.com if you need additional information or have any
ohair@554: * questions.
jjg@46: */
jjg@46:
jjg@46: package com.sun.tools.classfile;
jjg@46:
jjg@1357: import java.util.Map;
jjg@1357:
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Double_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Fieldref_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Float_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Integer_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_InterfaceMethodref_info;
ksrini@826: import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Long_info;
ksrini@826: import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info;
ksrini@826: import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodType_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_NameAndType_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info;
jjg@46: import com.sun.tools.classfile.ConstantPool.CPInfo;
jjg@46:
jjg@46: /**
jjg@46: * Rewrites a class file using a map of translations.
jjg@46: *
jjg@581: *
This is NOT part of any supported API.
jjg@581: * If you write code that depends on this, you do so at your own risk.
jjg@46: * This code and its internal interfaces are subject to change or
jjg@46: * deletion without notice.
jjg@46: */
jjg@46: public class ClassTranslator
jjg@46: implements ConstantPool.Visitor> {
jjg@46: /**
jjg@46: * Create a new ClassFile from {@code cf}, such that for all entries
jjg@46: * {@code k -\> v} in {@code translations},
jjg@46: * each occurrence of {@code k} in {@code cf} will be replaced by {@code v}.
jjg@46: * in
jjg@46: * @param cf the class file to be processed
jjg@46: * @param translations the set of translations to be applied
jjg@46: * @return a copy of {@code} with the values in {@code translations} substituted
jjg@46: */
jjg@46: public ClassFile translate(ClassFile cf, Map translations) {
jjg@46: ClassFile cf2 = (ClassFile) translations.get(cf);
jjg@46: if (cf2 == null) {
jjg@46: ConstantPool constant_pool2 = translate(cf.constant_pool, translations);
jjg@46: Field[] fields2 = translate(cf.fields, cf.constant_pool, translations);
jjg@46: Method[] methods2 = translateMethods(cf.methods, cf.constant_pool, translations);
jjg@46: Attributes attributes2 = translateAttributes(cf.attributes, cf.constant_pool,
jjg@46: translations);
jjg@46:
jjg@46: if (constant_pool2 == cf.constant_pool &&
jjg@46: fields2 == cf.fields &&
jjg@46: methods2 == cf.methods &&
jjg@46: attributes2 == cf.attributes)
jjg@46: cf2 = cf;
jjg@46: else
jjg@46: cf2 = new ClassFile(
jjg@46: cf.magic,
jjg@46: cf.minor_version,
jjg@46: cf.major_version,
jjg@46: constant_pool2,
jjg@46: cf.access_flags,
jjg@46: cf.this_class,
jjg@46: cf.super_class,
jjg@46: cf.interfaces,
jjg@46: fields2,
jjg@46: methods2,
jjg@46: attributes2);
jjg@46: translations.put(cf, cf2);
jjg@46: }
jjg@46: return cf2;
jjg@46: }
jjg@46:
jjg@46: ConstantPool translate(ConstantPool cp, Map translations) {
jjg@46: ConstantPool cp2 = (ConstantPool) translations.get(cp);
jjg@46: if (cp2 == null) {
jjg@46: ConstantPool.CPInfo[] pool2 = new ConstantPool.CPInfo[cp.size()];
jjg@46: boolean eq = true;
jjg@282: for (int i = 0; i < cp.size(); ) {
jjg@46: ConstantPool.CPInfo cpInfo;
jjg@46: try {
jjg@46: cpInfo = cp.get(i);
jjg@46: } catch (ConstantPool.InvalidIndex e) {
jjg@46: throw new IllegalStateException(e);
jjg@46: }
jjg@46: ConstantPool.CPInfo cpInfo2 = translate(cpInfo, translations);
jjg@46: eq &= (cpInfo == cpInfo2);
jjg@46: pool2[i] = cpInfo2;
jjg@46: if (cpInfo.getTag() != cpInfo2.getTag())
jjg@46: throw new IllegalStateException();
jjg@282: i += cpInfo.size();
jjg@46: }
jjg@46:
jjg@46: if (eq)
jjg@46: cp2 = cp;
jjg@46: else
jjg@46: cp2 = new ConstantPool(pool2);
jjg@46:
jjg@46: translations.put(cp, cp2);
jjg@46: }
jjg@46: return cp2;
jjg@46: }
jjg@46:
jjg@46: ConstantPool.CPInfo translate(ConstantPool.CPInfo cpInfo, Map translations) {
jjg@46: ConstantPool.CPInfo cpInfo2 = (ConstantPool.CPInfo) translations.get(cpInfo);
jjg@46: if (cpInfo2 == null) {
jjg@46: cpInfo2 = cpInfo.accept(this, translations);
jjg@46: translations.put(cpInfo, cpInfo2);
jjg@46: }
jjg@46: return cpInfo2;
jjg@46: }
jjg@46:
jjg@46: Field[] translate(Field[] fields, ConstantPool constant_pool, Map translations) {
jjg@46: Field[] fields2 = (Field[]) translations.get(fields);
jjg@46: if (fields2 == null) {
jjg@46: fields2 = new Field[fields.length];
jjg@46: for (int i = 0; i < fields.length; i++)
jjg@46: fields2[i] = translate(fields[i], constant_pool, translations);
jjg@46: if (equal(fields, fields2))
jjg@46: fields2 = fields;
jjg@46: translations.put(fields, fields2);
jjg@46: }
jjg@46: return fields2;
jjg@46: }
jjg@46:
jjg@46: Field translate(Field field, ConstantPool constant_pool, Map translations) {
jjg@46: Field field2 = (Field) translations.get(field);
jjg@46: if (field2 == null) {
jjg@46: Attributes attributes2 = translateAttributes(field.attributes, constant_pool,
jjg@46: translations);
jjg@46:
jjg@46: if (attributes2 == field.attributes)
jjg@46: field2 = field;
jjg@46: else
jjg@46: field2 = new Field(
jjg@46: field.access_flags,
jjg@46: field.name_index,
jjg@46: field.descriptor,
jjg@46: attributes2);
jjg@46: translations.put(field, field2);
jjg@46: }
jjg@46: return field2;
jjg@46: }
jjg@46:
jjg@46: Method[] translateMethods(Method[] methods, ConstantPool constant_pool, Map translations) {
jjg@46: Method[] methods2 = (Method[]) translations.get(methods);
jjg@46: if (methods2 == null) {
jjg@46: methods2 = new Method[methods.length];
jjg@46: for (int i = 0; i < methods.length; i++)
jjg@46: methods2[i] = translate(methods[i], constant_pool, translations);
jjg@46: if (equal(methods, methods2))
jjg@46: methods2 = methods;
jjg@46: translations.put(methods, methods2);
jjg@46: }
jjg@46: return methods2;
jjg@46: }
jjg@46:
jjg@46: Method translate(Method method, ConstantPool constant_pool, Map translations) {
jjg@46: Method method2 = (Method) translations.get(method);
jjg@46: if (method2 == null) {
jjg@46: Attributes attributes2 = translateAttributes(method.attributes, constant_pool,
jjg@46: translations);
jjg@46:
jjg@46: if (attributes2 == method.attributes)
jjg@46: method2 = method;
jjg@46: else
jjg@46: method2 = new Method(
jjg@46: method.access_flags,
jjg@46: method.name_index,
jjg@46: method.descriptor,
jjg@46: attributes2);
jjg@46: translations.put(method, method2);
jjg@46: }
jjg@46: return method2;
jjg@46: }
jjg@46:
jjg@46: Attributes translateAttributes(Attributes attributes,
jjg@46: ConstantPool constant_pool, Map translations) {
jjg@46: Attributes attributes2 = (Attributes) translations.get(attributes);
jjg@46: if (attributes2 == null) {
jjg@46: Attribute[] attrArray2 = new Attribute[attributes.size()];
jjg@46: ConstantPool constant_pool2 = translate(constant_pool, translations);
jjg@46: boolean attrsEqual = true;
jjg@46: for (int i = 0; i < attributes.size(); i++) {
jjg@46: Attribute attr = attributes.get(i);
jjg@46: Attribute attr2 = translate(attr, translations);
jjg@46: if (attr2 != attr)
jjg@46: attrsEqual = false;
jjg@46: attrArray2[i] = attr2;
jjg@46: }
jjg@46: if ((constant_pool2 == constant_pool) && attrsEqual)
jjg@46: attributes2 = attributes;
jjg@46: else
jjg@46: attributes2 = new Attributes(constant_pool2, attrArray2);
jjg@46: translations.put(attributes, attributes2);
jjg@46: }
jjg@46: return attributes2;
jjg@46: }
jjg@46:
jjg@46: Attribute translate(Attribute attribute, Map translations) {
jjg@46: Attribute attribute2 = (Attribute) translations.get(attribute);
jjg@46: if (attribute2 == null) {
jjg@46: attribute2 = attribute; // don't support translation within attributes yet
jjg@46: // (what about Code attribute)
jjg@46: translations.put(attribute, attribute2);
jjg@46: }
jjg@46: return attribute2;
jjg@46: }
jjg@46:
jjg@46: private static boolean equal(T[] a1, T[] a2) {
jjg@46: if (a1 == null || a2 == null)
jjg@46: return (a1 == a2);
jjg@46: if (a1.length != a2.length)
jjg@46: return false;
jjg@46: for (int i = 0; i < a1.length; i++) {
jjg@46: if (a1[i] != a2[i])
jjg@46: return false;
jjg@46: }
jjg@46: return true;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitClass(CONSTANT_Class_info info, Map translations) {
jjg@46: CONSTANT_Class_info info2 = (CONSTANT_Class_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: ConstantPool cp2 = translate(info.cp, translations);
jjg@46: if (cp2 == info.cp)
jjg@46: info2 = info;
jjg@46: else
jjg@46: info2 = new CONSTANT_Class_info(cp2, info.name_index);
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitDouble(CONSTANT_Double_info info, Map translations) {
jjg@46: CONSTANT_Double_info info2 = (CONSTANT_Double_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: info2 = info;
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitFieldref(CONSTANT_Fieldref_info info, Map translations) {
jjg@46: CONSTANT_Fieldref_info info2 = (CONSTANT_Fieldref_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: ConstantPool cp2 = translate(info.cp, translations);
jjg@46: if (cp2 == info.cp)
jjg@46: info2 = info;
jjg@46: else
jjg@46: info2 = new CONSTANT_Fieldref_info(cp2, info.class_index, info.name_and_type_index);
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitFloat(CONSTANT_Float_info info, Map translations) {
jjg@46: CONSTANT_Float_info info2 = (CONSTANT_Float_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: info2 = info;
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitInteger(CONSTANT_Integer_info info, Map translations) {
jjg@46: CONSTANT_Integer_info info2 = (CONSTANT_Integer_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: info2 = info;
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Map translations) {
jjg@46: CONSTANT_InterfaceMethodref_info info2 = (CONSTANT_InterfaceMethodref_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: ConstantPool cp2 = translate(info.cp, translations);
jjg@46: if (cp2 == info.cp)
jjg@46: info2 = info;
jjg@46: else
jjg@46: info2 = new CONSTANT_InterfaceMethodref_info(cp2, info.class_index, info.name_and_type_index);
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
ksrini@826: public CPInfo visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Map translations) {
ksrini@826: CONSTANT_InvokeDynamic_info info2 = (CONSTANT_InvokeDynamic_info) translations.get(info);
ksrini@826: if (info2 == null) {
ksrini@826: ConstantPool cp2 = translate(info.cp, translations);
ksrini@826: if (cp2 == info.cp) {
ksrini@826: info2 = info;
ksrini@826: } else {
ksrini@826: info2 = new CONSTANT_InvokeDynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index);
ksrini@826: }
ksrini@826: translations.put(info, info2);
ksrini@826: }
ksrini@826: return info;
ksrini@826: }
ksrini@826:
jjg@46: public CPInfo visitLong(CONSTANT_Long_info info, Map translations) {
jjg@46: CONSTANT_Long_info info2 = (CONSTANT_Long_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: info2 = info;
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitNameAndType(CONSTANT_NameAndType_info info, Map translations) {
jjg@46: CONSTANT_NameAndType_info info2 = (CONSTANT_NameAndType_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: ConstantPool cp2 = translate(info.cp, translations);
jjg@46: if (cp2 == info.cp)
jjg@46: info2 = info;
jjg@46: else
jjg@46: info2 = new CONSTANT_NameAndType_info(cp2, info.name_index, info.type_index);
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitMethodref(CONSTANT_Methodref_info info, Map translations) {
jjg@46: CONSTANT_Methodref_info info2 = (CONSTANT_Methodref_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: ConstantPool cp2 = translate(info.cp, translations);
jjg@46: if (cp2 == info.cp)
jjg@46: info2 = info;
jjg@46: else
jjg@46: info2 = new CONSTANT_Methodref_info(cp2, info.class_index, info.name_and_type_index);
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
ksrini@826: public CPInfo visitMethodHandle(CONSTANT_MethodHandle_info info, Map translations) {
ksrini@826: CONSTANT_MethodHandle_info info2 = (CONSTANT_MethodHandle_info) translations.get(info);
ksrini@826: if (info2 == null) {
ksrini@826: ConstantPool cp2 = translate(info.cp, translations);
ksrini@826: if (cp2 == info.cp) {
ksrini@826: info2 = info;
ksrini@826: } else {
ksrini@826: info2 = new CONSTANT_MethodHandle_info(cp2, info.reference_kind, info.reference_index);
ksrini@826: }
ksrini@826: translations.put(info, info2);
ksrini@826: }
ksrini@826: return info;
ksrini@826: }
ksrini@826:
ksrini@826: public CPInfo visitMethodType(CONSTANT_MethodType_info info, Map translations) {
ksrini@826: CONSTANT_MethodType_info info2 = (CONSTANT_MethodType_info) translations.get(info);
ksrini@826: if (info2 == null) {
ksrini@826: ConstantPool cp2 = translate(info.cp, translations);
ksrini@826: if (cp2 == info.cp) {
ksrini@826: info2 = info;
ksrini@826: } else {
ksrini@826: info2 = new CONSTANT_MethodType_info(cp2, info.descriptor_index);
ksrini@826: }
ksrini@826: translations.put(info, info2);
ksrini@826: }
ksrini@826: return info;
ksrini@826: }
ksrini@826:
jjg@46: public CPInfo visitString(CONSTANT_String_info info, Map translations) {
jjg@46: CONSTANT_String_info info2 = (CONSTANT_String_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: ConstantPool cp2 = translate(info.cp, translations);
jjg@46: if (cp2 == info.cp)
jjg@46: info2 = info;
jjg@46: else
jjg@46: info2 = new CONSTANT_String_info(cp2, info.string_index);
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: public CPInfo visitUtf8(CONSTANT_Utf8_info info, Map translations) {
jjg@46: CONSTANT_Utf8_info info2 = (CONSTANT_Utf8_info) translations.get(info);
jjg@46: if (info2 == null) {
jjg@46: info2 = info;
jjg@46: translations.put(info, info2);
jjg@46: }
jjg@46: return info;
jjg@46: }
jjg@46:
jjg@46: }