1 /*
   2  * Copyright (c) 2013, 2019, 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  */
  25 
  26 package jdk.jfr.internal.instrument;
  27 
  28 import jdk.internal.org.objectweb.asm.Label;
  29 import jdk.internal.org.objectweb.asm.Opcodes;
  30 import jdk.internal.org.objectweb.asm.Type;
  31 import jdk.internal.org.objectweb.asm.commons.LocalVariablesSorter;
  32 import jdk.internal.org.objectweb.asm.commons.Remapper;
  33 import jdk.internal.org.objectweb.asm.commons.RemappingMethodAdapter;
  34 
  35 @Deprecated
  36 final class JIMethodInliningAdapter extends RemappingMethodAdapter {
  37     private final LocalVariablesSorter lvs;
  38     private final Label end;
  39 
  40     public JIMethodInliningAdapter(LocalVariablesSorter mv, Label end, int acc, String desc, Remapper remapper) {
  41         super(acc, desc, mv, remapper);
  42         this.lvs = mv;
  43         this.end = end;
  44         int offset = isStatic(acc) ? 0 : 1;
  45         Type[] args = Type.getArgumentTypes(desc);
  46         for (int i = args.length - 1; i >= 0; i--) {
  47             super.visitVarInsn(args[i].getOpcode(Opcodes.ISTORE), i + offset);
  48         }
  49         if (offset > 0) {
  50             super.visitVarInsn(Opcodes.ASTORE, 0);
  51         }
  52     }
  53 
  54     private boolean isStatic(int acc) {
  55         return (acc & Opcodes.ACC_STATIC) != 0;
  56     }
  57 
  58     @Override
  59     public void visitInsn(int opcode) {
  60         if (opcode == Opcodes.RETURN || opcode == Opcodes.IRETURN
  61                 || opcode == Opcodes.ARETURN || opcode == Opcodes.LRETURN) {
  62             super.visitJumpInsn(Opcodes.GOTO, end);
  63         } else {
  64             super.visitInsn(opcode);
  65         }
  66     }
  67 
  68     @Override
  69     public void visitMaxs(int stack, int locals) {
  70     }
  71 
  72     @Override
  73     protected int newLocalMapping(Type type) {
  74         return lvs.newLocal(type);
  75     }
  76 }