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

 /*

  * Copyright (c) 2002, 2008, 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

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 package com.sun.tools.javah;

 import javax.lang.model.element.ExecutableElement;

 import javax.lang.model.element.TypeElement;

 import javax.lang.model.element.VariableElement;

 import javax.lang.model.util.Elements;

 import javax.lang.model.util.Types;

 /**

  * A utility for mangling java identifiers into C names.  Should make

  * this more fine grained and distribute the functionality to the

  * generators.

  *

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

  * 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></p>

  *

  * @author  Sucheta Dambalkar(Revised)

  */

 public class Mangle {

     public static class Type {

         public static final int CLASS            = 1;

         public static final int FIELDSTUB        = 2;

         public static final int FIELD            = 3;

         public static final int JNI              = 4;

         public static final int SIGNATURE        = 5;

         public static final int METHOD_JDK_1     = 6;

         public static final int METHOD_JNI_SHORT = 7;

         public static final int METHOD_JNI_LONG  = 8;

     };

     private Elements elems;

     private Types types;

     Mangle(Elements elems, Types types) {

         this.elems = elems;

         this.types = types;

     }

     public final String mangle(CharSequence name, int mtype) {

         StringBuffer result = new StringBuffer(100);

         int length = name.length();

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

             char ch = name.charAt(i);

             if (isalnum(ch)) {

                 result.append(ch);

             } else if ((ch == '.') &&

                        mtype == Mangle.Type.CLASS) {

                 result.append('_');

             } else if (( ch == '$') &&

                        mtype == Mangle.Type.CLASS) {

                 result.append('_');

                 result.append('_');

             } else if (ch == '_' && mtype == Mangle.Type.FIELDSTUB) {

                 result.append('_');

             } else if (ch == '_' && mtype == Mangle.Type.CLASS) {

                 result.append('_');

             } else if (mtype == Mangle.Type.JNI) {

                 String esc = null;

                 if (ch == '_')

                     esc = "_1";

                 else if (ch == '.')

                     esc = "_";

                 else if (ch == ';')

                     esc = "_2";

                 else if (ch == '[')

                     esc = "_3";

                 if (esc != null) {

                     result.append(esc);

                 } else {

                     result.append(mangleChar(ch));

                 }

             } else if (mtype == Mangle.Type.SIGNATURE) {

                 if (isprint(ch)) {

                     result.append(ch);

                 } else {

                     result.append(mangleChar(ch));

                 }

             } else {

                 result.append(mangleChar(ch));

             }

         }

         return result.toString();

     }

     public String mangleMethod(ExecutableElement method, TypeElement clazz,

                                       int mtype) {

         StringBuffer result = new StringBuffer(100);

         result.append("Java_");

         if (mtype == Mangle.Type.METHOD_JDK_1) {

             result.append(mangle(clazz.getQualifiedName(), Mangle.Type.CLASS));

             result.append('_');

             result.append(mangle(method.getSimpleName(),

                                  Mangle.Type.FIELD));

             result.append("_stub");

             return result.toString();

         }

         /* JNI */

         result.append(mangle(getInnerQualifiedName(clazz), Mangle.Type.JNI));

         result.append('_');

         result.append(mangle(method.getSimpleName(),

                              Mangle.Type.JNI));

         if (mtype == Mangle.Type.METHOD_JNI_LONG) {

             result.append("__");

             String typesig = signature(method);

             TypeSignature newTypeSig = new TypeSignature(elems);

             String sig = newTypeSig.getTypeSignature(typesig,  method.getReturnType());

             sig = sig.substring(1);

             sig = sig.substring(0, sig.lastIndexOf(')'));

             sig = sig.replace('/', '.');

             result.append(mangle(sig, Mangle.Type.JNI));

         }

         return result.toString();

     }

     //where

         private String getInnerQualifiedName(TypeElement clazz) {

             return elems.getBinaryName(clazz).toString();

         }

     public final String mangleChar(char ch) {

         String s = Integer.toHexString(ch);

         int nzeros = 5 - s.length();

         char[] result = new char[6];

         result[0] = '_';

         for (int i = 1; i <= nzeros; i++)

             result[i] = '0';

         for (int i = nzeros+1, j = 0; i < 6; i++, j++)

             result[i] = s.charAt(j);

         return new String(result);

     }

     // Warning: duplicated in Gen

     private String signature(ExecutableElement e) {

         StringBuffer sb = new StringBuffer();

         String sep = "(";

         for (VariableElement p: e.getParameters()) {

             sb.append(sep);

             sb.append(types.erasure(p.asType()).toString());

             sep = ",";

         }

         sb.append(")");

         return sb.toString();

     }

     /* Warning: Intentional ASCII operation. */

     private static final boolean isalnum(char ch) {

         return ch <= 0x7f && /* quick test */

             ((ch >= 'A' && ch <= 'Z') ||

              (ch >= 'a' && ch <= 'z') ||

              (ch >= '0' && ch <= '9'));

     }

     /* Warning: Intentional ASCII operation. */

     private static final boolean isprint(char ch) {

         return ch >= 32 && ch <= 126;

     }

 }