jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/classfile/ClassTranslator.java@5cf6c432ef2f

     1 /*

     2  * Copyright (c) 2008, 2011 Oracle and/or its affiliates. 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.  Oracle designates this

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

     9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * 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_InvokeDynamic_info;

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

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

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

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

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

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

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

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

    43 import java.util.Map;

    45 /**

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

    47  *

    48  *  <p><b>This is NOT part of any supported API.

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

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

    51  *  deletion without notice.</b>

    52  */

    53 public class ClassTranslator

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

    55     /**

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

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

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

    59      * in

    60      * @param cf the class file to be processed

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

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

    63      */

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

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

    66         if (cf2 == null) {

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

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

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

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

    71                     translations);

    73             if (constant_pool2 == cf.constant_pool &&

    74                     fields2 == cf.fields &&

    75                     methods2 == cf.methods &&

    76                     attributes2 == cf.attributes)

    77                 cf2 = cf;

    78             else

    79                 cf2 = new ClassFile(

    80                         cf.magic,

    81                         cf.minor_version,

    82                         cf.major_version,

    83                         constant_pool2,

    84                         cf.access_flags,

    85                         cf.this_class,

    86                         cf.super_class,

    87                         cf.interfaces,

    88                         fields2,

    89                         methods2,

    90                         attributes2);

    91             translations.put(cf, cf2);

    92         }

    93         return cf2;

    94     }

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

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

    98         if (cp2 == null) {

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

   100             boolean eq = true;

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

   102                 ConstantPool.CPInfo cpInfo;

   103                 try {

   104                     cpInfo = cp.get(i);

   105                 } catch (ConstantPool.InvalidIndex e) {

   106                     throw new IllegalStateException(e);

   107                 }

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

   109                 eq &= (cpInfo == cpInfo2);

   110                 pool2[i] = cpInfo2;

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

   112                     throw new IllegalStateException();

   113                 i += cpInfo.size();

   114             }

   116             if (eq)

   117                 cp2 = cp;

   118             else

   119                 cp2 = new ConstantPool(pool2);

   121             translations.put(cp, cp2);

   122         }

   123         return cp2;

   124     }

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

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

   128         if (cpInfo2 == null) {

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

   130             translations.put(cpInfo, cpInfo2);

   131         }

   132         return cpInfo2;

   133     }

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

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

   137         if (fields2 == null) {

   138             fields2 = new Field[fields.length];

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

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

   141             if (equal(fields, fields2))

   142                 fields2 = fields;

   143             translations.put(fields, fields2);

   144         }

   145         return fields2;

   146     }

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

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

   150         if (field2 == null) {

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

   152                     translations);

   154             if (attributes2 == field.attributes)

   155                 field2 = field;

   156             else

   157                 field2 = new Field(

   158                         field.access_flags,

   159                         field.name_index,

   160                         field.descriptor,

   161                         attributes2);

   162             translations.put(field, field2);

   163         }

   164         return field2;

   165     }

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

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

   169         if (methods2 == null) {

   170             methods2 = new Method[methods.length];

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

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

   173             if (equal(methods, methods2))

   174                 methods2 = methods;

   175             translations.put(methods, methods2);

   176         }

   177         return methods2;

   178     }

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

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

   182         if (method2 == null) {

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

   184                     translations);

   186             if (attributes2 == method.attributes)

   187                 method2 = method;

   188             else

   189                 method2 = new Method(

   190                         method.access_flags,

   191                         method.name_index,

   192                         method.descriptor,

   193                         attributes2);

   194             translations.put(method, method2);

   195         }

   196         return method2;

   197     }

   199     Attributes translateAttributes(Attributes attributes,

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

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

   202         if (attributes2 == null) {

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

   204             ConstantPool constant_pool2 = translate(constant_pool, translations);

   205             boolean attrsEqual = true;

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

   207                 Attribute attr = attributes.get(i);

   208                 Attribute attr2 = translate(attr, translations);

   209                 if (attr2 != attr)

   210                     attrsEqual = false;

   211                 attrArray2[i] = attr2;

   212             }

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

   214                 attributes2 = attributes;

   215             else

   216                 attributes2 = new Attributes(constant_pool2, attrArray2);

   217             translations.put(attributes, attributes2);

   218         }

   219         return attributes2;

   220     }

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

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

   224         if (attribute2 == null) {

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

   226                                     // (what about Code attribute)

   227             translations.put(attribute, attribute2);

   228         }

   229         return attribute2;

   230     }

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

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

   234             return (a1 == a2);

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

   236             return false;

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

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

   239                 return false;

   240         }

   241         return true;

   242     }

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

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

   246         if (info2 == null) {

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

   248             if (cp2 == info.cp)

   249                 info2 = info;

   250             else

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

   252             translations.put(info, info2);

   253         }

   254         return info;

   255     }

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

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

   259         if (info2 == null) {

   260             info2 = info;

   261             translations.put(info, info2);

   262         }

   263         return info;

   264     }

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

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

   268         if (info2 == null) {

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

   270             if (cp2 == info.cp)

   271                 info2 = info;

   272             else

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

   274             translations.put(info, info2);

   275         }

   276         return info;

   277     }

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

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

   281         if (info2 == null) {

   282             info2 = info;

   283             translations.put(info, info2);

   284         }

   285         return info;

   286     }

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

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

   290         if (info2 == null) {

   291             info2 = info;

   292             translations.put(info, info2);

   293         }

   294         return info;

   295     }

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

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

   299         if (info2 == null) {

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

   301             if (cp2 == info.cp)

   302                 info2 = info;

   303             else

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

   305             translations.put(info, info2);

   306         }

   307         return info;

   308     }

   310     public CPInfo visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Map<Object, Object> translations) {

   311         CONSTANT_InvokeDynamic_info info2 = (CONSTANT_InvokeDynamic_info) translations.get(info);

   312         if (info2 == null) {

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

   314             if (cp2 == info.cp) {

   315                 info2 = info;

   316             } else {

   317                 info2 = new CONSTANT_InvokeDynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index);

   318             }

   319             translations.put(info, info2);

   320         }

   321         return info;

   322     }

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

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

   326         if (info2 == null) {

   327             info2 = info;

   328             translations.put(info, info2);

   329         }

   330         return info;

   331     }

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

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

   335         if (info2 == null) {

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

   337             if (cp2 == info.cp)

   338                 info2 = info;

   339             else

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

   341             translations.put(info, info2);

   342         }

   343         return info;

   344     }

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

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

   348         if (info2 == null) {

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

   350             if (cp2 == info.cp)

   351                 info2 = info;

   352             else

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

   354             translations.put(info, info2);

   355         }

   356         return info;

   357     }

   359     public CPInfo visitMethodHandle(CONSTANT_MethodHandle_info info, Map<Object, Object> translations) {

   360         CONSTANT_MethodHandle_info info2 = (CONSTANT_MethodHandle_info) translations.get(info);

   361         if (info2 == null) {

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

   363             if (cp2 == info.cp) {

   364                 info2 = info;

   365             } else {

   366                 info2 = new CONSTANT_MethodHandle_info(cp2, info.reference_kind, info.reference_index);

   367             }

   368             translations.put(info, info2);

   369         }

   370         return info;

   371     }

   373     public CPInfo visitMethodType(CONSTANT_MethodType_info info, Map<Object, Object> translations) {

   374         CONSTANT_MethodType_info info2 = (CONSTANT_MethodType_info) translations.get(info);

   375         if (info2 == null) {

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

   377             if (cp2 == info.cp) {

   378                 info2 = info;

   379             } else {

   380                 info2 = new CONSTANT_MethodType_info(cp2, info.descriptor_index);

   381             }

   382             translations.put(info, info2);

   383         }

   384         return info;

   385     }

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

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

   389         if (info2 == null) {

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

   391             if (cp2 == info.cp)

   392                 info2 = info;

   393             else

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

   395             translations.put(info, info2);

   396         }

   397         return info;

   398     }

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

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

   402         if (info2 == null) {

   403             info2 = info;

   404             translations.put(info, info2);

   405         }

   406         return info;

   407     }

   409 }

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

src/share/classes/com/sun/tools/classfile/ClassTranslator.java@5cf6c432ef2f

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