jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/classfile/ClassTranslator.java@fc634a593812

     1 /*

     2  * Copyright 2008 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    26 package com.sun.tools.classfile;

    28 import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info;

    29 import com.sun.tools.classfile.ConstantPool.CONSTANT_Double_info;

    30 import com.sun.tools.classfile.ConstantPool.CONSTANT_Fieldref_info;

    31 import com.sun.tools.classfile.ConstantPool.CONSTANT_Float_info;

    32 import com.sun.tools.classfile.ConstantPool.CONSTANT_Integer_info;

    33 import com.sun.tools.classfile.ConstantPool.CONSTANT_InterfaceMethodref_info;

    34 import com.sun.tools.classfile.ConstantPool.CONSTANT_Long_info;

    35 import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info;

    36 import com.sun.tools.classfile.ConstantPool.CONSTANT_NameAndType_info;

    37 import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info;

    38 import com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info;

    39 import com.sun.tools.classfile.ConstantPool.CPInfo;

    40 import java.util.Map;

    42 /**

    43  * Rewrites a class file using a map of translations.

    44  *

    45  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

    46  *  you write code that depends on this, you do so at your own risk.

    47  *  This code and its internal interfaces are subject to change or

    48  *  deletion without notice.</b>

    49  */

    50 public class ClassTranslator

    51         implements ConstantPool.Visitor<ConstantPool.CPInfo,Map<Object,Object>> {

    52     /**

    53      * Create a new ClassFile from {@code cf}, such that for all entries

    54      * {@code k&nbsp;-\&gt;&nbsp;v} in {@code translations},

    55      * each occurrence of {@code k} in {@code cf} will be replaced by {@code v}.

    56      * in

    57      * @param cf the class file to be processed

    58      * @param translations the set of translations to be applied

    59      * @return a copy of {@code} with the values in {@code translations} substituted

    60      */

    61     public ClassFile translate(ClassFile cf, Map<Object,Object> translations) {

    62         ClassFile cf2 = (ClassFile) translations.get(cf);

    63         if (cf2 == null) {

    64             ConstantPool constant_pool2 = translate(cf.constant_pool, translations);

    65             Field[] fields2 = translate(cf.fields, cf.constant_pool, translations);

    66             Method[] methods2 = translateMethods(cf.methods, cf.constant_pool, translations);

    67             Attributes attributes2 = translateAttributes(cf.attributes, cf.constant_pool,

    68                     translations);

    70             if (constant_pool2 == cf.constant_pool &&

    71                     fields2 == cf.fields &&

    72                     methods2 == cf.methods &&

    73                     attributes2 == cf.attributes)

    74                 cf2 = cf;

    75             else

    76                 cf2 = new ClassFile(

    77                         cf.magic,

    78                         cf.minor_version,

    79                         cf.major_version,

    80                         constant_pool2,

    81                         cf.access_flags,

    82                         cf.this_class,

    83                         cf.super_class,

    84                         cf.interfaces,

    85                         fields2,

    86                         methods2,

    87                         attributes2);

    88             translations.put(cf, cf2);

    89         }

    90         return cf2;

    91     }

    93     ConstantPool translate(ConstantPool cp, Map<Object,Object> translations) {

    94         ConstantPool cp2 = (ConstantPool) translations.get(cp);

    95         if (cp2 == null) {

    96             ConstantPool.CPInfo[] pool2 = new ConstantPool.CPInfo[cp.size()];

    97             boolean eq = true;

    98             for (int i = 0; i < cp.size(); ) {

    99                 ConstantPool.CPInfo cpInfo;

   100                 try {

   101                     cpInfo = cp.get(i);

   102                 } catch (ConstantPool.InvalidIndex e) {

   103                     throw new IllegalStateException(e);

   104                 }

   105                 ConstantPool.CPInfo cpInfo2 = translate(cpInfo, translations);

   106                 eq &= (cpInfo == cpInfo2);

   107                 pool2[i] = cpInfo2;

   108                 if (cpInfo.getTag() != cpInfo2.getTag())

   109                     throw new IllegalStateException();

   110                 i += cpInfo.size();

   111             }

   113             if (eq)

   114                 cp2 = cp;

   115             else

   116                 cp2 = new ConstantPool(pool2);

   118             translations.put(cp, cp2);

   119         }

   120         return cp2;

   121     }

   123     ConstantPool.CPInfo translate(ConstantPool.CPInfo cpInfo, Map<Object,Object> translations) {

   124         ConstantPool.CPInfo cpInfo2 = (ConstantPool.CPInfo) translations.get(cpInfo);

   125         if (cpInfo2 == null) {

   126             cpInfo2 = cpInfo.accept(this, translations);

   127             translations.put(cpInfo, cpInfo2);

   128         }

   129         return cpInfo2;

   130     }

   132     Field[] translate(Field[] fields, ConstantPool constant_pool, Map<Object,Object> translations) {

   133         Field[] fields2 = (Field[]) translations.get(fields);

   134         if (fields2 == null) {

   135             fields2 = new Field[fields.length];

   136             for (int i = 0; i < fields.length; i++)

   137                 fields2[i] = translate(fields[i], constant_pool, translations);

   138             if (equal(fields, fields2))

   139                 fields2 = fields;

   140             translations.put(fields, fields2);

   141         }

   142         return fields2;

   143     }

   145     Field translate(Field field, ConstantPool constant_pool, Map<Object,Object> translations) {

   146         Field field2 = (Field) translations.get(field);

   147         if (field2 == null) {

   148             Attributes attributes2 = translateAttributes(field.attributes, constant_pool,

   149                     translations);

   151             if (attributes2 == field.attributes)

   152                 field2 = field;

   153             else

   154                 field2 = new Field(

   155                         field.access_flags,

   156                         field.name_index,

   157                         field.descriptor,

   158                         attributes2);

   159             translations.put(field, field2);

   160         }

   161         return field2;

   162     }

   164     Method[] translateMethods(Method[] methods, ConstantPool constant_pool, Map<Object,Object> translations) {

   165         Method[] methods2 = (Method[]) translations.get(methods);

   166         if (methods2 == null) {

   167             methods2 = new Method[methods.length];

   168             for (int i = 0; i < methods.length; i++)

   169                 methods2[i] = translate(methods[i], constant_pool, translations);

   170             if (equal(methods, methods2))

   171                 methods2 = methods;

   172             translations.put(methods, methods2);

   173         }

   174         return methods2;

   175     }

   177     Method translate(Method method, ConstantPool constant_pool, Map<Object,Object> translations) {

   178         Method method2 = (Method) translations.get(method);

   179         if (method2 == null) {

   180             Attributes attributes2 = translateAttributes(method.attributes, constant_pool,

   181                     translations);

   183             if (attributes2 == method.attributes)

   184                 method2 = method;

   185             else

   186                 method2 = new Method(

   187                         method.access_flags,

   188                         method.name_index,

   189                         method.descriptor,

   190                         attributes2);

   191             translations.put(method, method2);

   192         }

   193         return method2;

   194     }

   196     Attributes translateAttributes(Attributes attributes,

   197             ConstantPool constant_pool, Map<Object,Object> translations) {

   198         Attributes attributes2 = (Attributes) translations.get(attributes);

   199         if (attributes2 == null) {

   200             Attribute[] attrArray2 = new Attribute[attributes.size()];

   201             ConstantPool constant_pool2 = translate(constant_pool, translations);

   202             boolean attrsEqual = true;

   203             for (int i = 0; i < attributes.size(); i++) {

   204                 Attribute attr = attributes.get(i);

   205                 Attribute attr2 = translate(attr, translations);

   206                 if (attr2 != attr)

   207                     attrsEqual = false;

   208                 attrArray2[i] = attr2;

   209             }

   210             if ((constant_pool2 == constant_pool) && attrsEqual)

   211                 attributes2 = attributes;

   212             else

   213                 attributes2 = new Attributes(constant_pool2, attrArray2);

   214             translations.put(attributes, attributes2);

   215         }

   216         return attributes2;

   217     }

   219     Attribute translate(Attribute attribute, Map<Object,Object> translations) {

   220         Attribute attribute2 = (Attribute) translations.get(attribute);

   221         if (attribute2 == null) {

   222             attribute2 = attribute; // don't support translation within attributes yet

   223                                     // (what about Code attribute)

   224             translations.put(attribute, attribute2);

   225         }

   226         return attribute2;

   227     }

   229     private static <T> boolean equal(T[] a1, T[] a2) {

   230         if (a1 == null || a2 == null)

   231             return (a1 == a2);

   232         if (a1.length != a2.length)

   233             return false;

   234         for (int i = 0; i < a1.length; i++) {

   235             if (a1[i] != a2[i])

   236                 return false;

   237         }

   238         return true;

   239     }

   241     public CPInfo visitClass(CONSTANT_Class_info info, Map<Object, Object> translations) {

   242         CONSTANT_Class_info info2 = (CONSTANT_Class_info) translations.get(info);

   243         if (info2 == null) {

   244             ConstantPool cp2 = translate(info.cp, translations);

   245             if (cp2 == info.cp)

   246                 info2 = info;

   247             else

   248                 info2 = new CONSTANT_Class_info(cp2, info.name_index);

   249             translations.put(info, info2);

   250         }

   251         return info;

   252     }

   254     public CPInfo visitDouble(CONSTANT_Double_info info, Map<Object, Object> translations) {

   255         CONSTANT_Double_info info2 = (CONSTANT_Double_info) translations.get(info);

   256         if (info2 == null) {

   257             info2 = info;

   258             translations.put(info, info2);

   259         }

   260         return info;

   261     }

   263     public CPInfo visitFieldref(CONSTANT_Fieldref_info info, Map<Object, Object> translations) {

   264         CONSTANT_Fieldref_info info2 = (CONSTANT_Fieldref_info) translations.get(info);

   265         if (info2 == null) {

   266             ConstantPool cp2 = translate(info.cp, translations);

   267             if (cp2 == info.cp)

   268                 info2 = info;

   269             else

   270                 info2 = new CONSTANT_Fieldref_info(cp2, info.class_index, info.name_and_type_index);

   271             translations.put(info, info2);

   272         }

   273         return info;

   274     }

   276     public CPInfo visitFloat(CONSTANT_Float_info info, Map<Object, Object> translations) {

   277         CONSTANT_Float_info info2 = (CONSTANT_Float_info) translations.get(info);

   278         if (info2 == null) {

   279             info2 = info;

   280             translations.put(info, info2);

   281         }

   282         return info;

   283     }

   285     public CPInfo visitInteger(CONSTANT_Integer_info info, Map<Object, Object> translations) {

   286         CONSTANT_Integer_info info2 = (CONSTANT_Integer_info) translations.get(info);

   287         if (info2 == null) {

   288             info2 = info;

   289             translations.put(info, info2);

   290         }

   291         return info;

   292     }

   294     public CPInfo visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Map<Object, Object> translations) {

   295         CONSTANT_InterfaceMethodref_info info2 = (CONSTANT_InterfaceMethodref_info) translations.get(info);

   296         if (info2 == null) {

   297             ConstantPool cp2 = translate(info.cp, translations);

   298             if (cp2 == info.cp)

   299                 info2 = info;

   300             else

   301                 info2 = new CONSTANT_InterfaceMethodref_info(cp2, info.class_index, info.name_and_type_index);

   302             translations.put(info, info2);

   303         }

   304         return info;

   305     }

   307     public CPInfo visitLong(CONSTANT_Long_info info, Map<Object, Object> translations) {

   308         CONSTANT_Long_info info2 = (CONSTANT_Long_info) translations.get(info);

   309         if (info2 == null) {

   310             info2 = info;

   311             translations.put(info, info2);

   312         }

   313         return info;

   314     }

   316     public CPInfo visitNameAndType(CONSTANT_NameAndType_info info, Map<Object, Object> translations) {

   317         CONSTANT_NameAndType_info info2 = (CONSTANT_NameAndType_info) translations.get(info);

   318         if (info2 == null) {

   319             ConstantPool cp2 = translate(info.cp, translations);

   320             if (cp2 == info.cp)

   321                 info2 = info;

   322             else

   323                 info2 = new CONSTANT_NameAndType_info(cp2, info.name_index, info.type_index);

   324             translations.put(info, info2);

   325         }

   326         return info;

   327     }

   329     public CPInfo visitMethodref(CONSTANT_Methodref_info info, Map<Object, Object> translations) {

   330         CONSTANT_Methodref_info info2 = (CONSTANT_Methodref_info) translations.get(info);

   331         if (info2 == null) {

   332             ConstantPool cp2 = translate(info.cp, translations);

   333             if (cp2 == info.cp)

   334                 info2 = info;

   335             else

   336                 info2 = new CONSTANT_Methodref_info(cp2, info.class_index, info.name_and_type_index);

   337             translations.put(info, info2);

   338         }

   339         return info;

   340     }

   342     public CPInfo visitString(CONSTANT_String_info info, Map<Object, Object> translations) {

   343         CONSTANT_String_info info2 = (CONSTANT_String_info) translations.get(info);

   344         if (info2 == null) {

   345             ConstantPool cp2 = translate(info.cp, translations);

   346             if (cp2 == info.cp)

   347                 info2 = info;

   348             else

   349                 info2 = new CONSTANT_String_info(cp2, info.string_index);

   350             translations.put(info, info2);

   351         }

   352         return info;

   353     }

   355     public CPInfo visitUtf8(CONSTANT_Utf8_info info, Map<Object, Object> translations) {

   356         CONSTANT_Utf8_info info2 = (CONSTANT_Utf8_info) translations.get(info);

   357         if (info2 == null) {

   358             info2 = info;

   359             translations.put(info, info2);

   360         }

   361         return info;

   362     }

   364 }

Mercurial > jdk8-mips64-public > langtools / file revision

src/share/classes/com/sun/tools/classfile/ClassTranslator.java@fc634a593812

src/share/classes/com/sun/tools/classfile/ClassTranslator.java