make/jdk/src/classes/build/tools/charsetmapping/SBCS.java

rev 56460 : 8231717: Improve performance of charset decoding when charset is always compactable

*** 1,7 ****
  /*
!  * Copyright (c) 2008, 2015, 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
--- 1,7 ----
  /*
!  * Copyright (c) 2008, 2019, 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
*** 44,53 ****
--- 44,54 ----
          String clzName = cs.clzName;
          String csName  = cs.csName;
          String hisName = cs.hisName;
          String pkgName = cs.pkgName;
          boolean isASCII = cs.isASCII;
+         boolean isAlwaysCompactable = true;
  
          StringBuilder b2cSB = new StringBuilder();
          StringBuilder b2cNRSB = new StringBuilder();
          StringBuilder c2bNRSB = new StringBuilder();
  
*** 67,76 ****
--- 68,80 ----
              sb[e.bs] = (char)e.cp;
              if (c2bIndex[e.cp>>8] == UNMAPPABLE_DECODING) {
                  c2bOff += 0x100;
                  c2bIndex[e.cp>>8] = 1;
              }
+             if (e.cp > 0xFF) {
+                 isAlwaysCompactable = false;
+             }
          }
  
          Formatter fm = new Formatter(b2cSB);
          fm.format("%n");
  
*** 176,185 ****
--- 180,192 ----
                      line = "        return (cs instanceof " + clzName + ");";
              }
              if (line.indexOf("$ASCIICOMPATIBLE$") != -1) {
                  line = line.replace("$ASCIICOMPATIBLE$", isASCII ? "true" : "false");
              }
+             if (line.indexOf("$ALWAYSCOMPACTABLE$") != -1) {
+                 line = line.replace("$ALWAYSCOMPACTABLE$", isAlwaysCompactable ? "true" : "false");
+             }
              if (line.indexOf("$B2CTABLE$") != -1) {
                  line = line.replace("$B2CTABLE$", b2c);
              }
              if (line.indexOf("$C2BLENGTH$") != -1) {
                  line = line.replace("$C2BLENGTH$", "0x" + Integer.toString(c2bOff, 16));