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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_bytecode.cpp.incl"







  27 
  28 // Implementation of Bytecode
  29 
  30 bool Bytecode::check_must_rewrite(Bytecodes::Code code) const {
  31   assert(Bytecodes::can_rewrite(code), "post-check only");
  32 
  33   // Some codes are conditionally rewriting.  Look closely at them.
  34   switch (code) {
  35   case Bytecodes::_aload_0:
  36     // Even if RewriteFrequentPairs is turned on,
  37     // the _aload_0 code might delay its rewrite until
  38     // a following _getfield rewrites itself.
  39     return false;
  40 
  41   case Bytecodes::_lookupswitch:
  42     return false;  // the rewrite is not done by the interpreter
  43 
  44   case Bytecodes::_new:
  45     // (Could actually look at the class here, but the profit would be small.)
  46     return false;  // the rewrite is not always done

   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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "interpreter/bytecode.hpp"
  27 #include "interpreter/linkResolver.hpp"
  28 #include "oops/constantPoolOop.hpp"
  29 #include "oops/oop.inline.hpp"
  30 #include "runtime/fieldType.hpp"
  31 #include "runtime/handles.inline.hpp"
  32 #include "runtime/safepoint.hpp"
  33 #include "runtime/signature.hpp"
  34 
  35 // Implementation of Bytecode
  36 
  37 bool Bytecode::check_must_rewrite(Bytecodes::Code code) const {
  38   assert(Bytecodes::can_rewrite(code), "post-check only");
  39 
  40   // Some codes are conditionally rewriting.  Look closely at them.
  41   switch (code) {
  42   case Bytecodes::_aload_0:
  43     // Even if RewriteFrequentPairs is turned on,
  44     // the _aload_0 code might delay its rewrite until
  45     // a following _getfield rewrites itself.
  46     return false;
  47 
  48   case Bytecodes::_lookupswitch:
  49     return false;  // the rewrite is not done by the interpreter
  50 
  51   case Bytecodes::_new:
  52     // (Could actually look at the class here, but the profit would be small.)
  53     return false;  // the rewrite is not always done