pt.minha.kernel.instrument.FakeMonitorClassVisitor.java Source code

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Here is the source code for pt.minha.kernel.instrument.FakeMonitorClassVisitor.java

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/*
 * Minha.pt: middleware testing platform.
 * Copyright (c) 2011-2014, Universidade do Minho.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package pt.minha.kernel.instrument;

import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;

public class FakeMonitorClassVisitor extends ClassVisitor {

    private Translation trans;

    public FakeMonitorClassVisitor(ClassVisitor arg0, Translation trans) {
        super(Opcodes.ASM5, arg0);
        this.trans = trans;
    }

    public void visit(int version, int access, String name, String signature, String supername,
            String[] interfaces) {
        if (trans.isSynchronized()) {
            if (supername.equals("java/lang/Object") && (access & Opcodes.ACC_INTERFACE) == 0)
                supername = ClassConfig.fake_prefix + supername;
        }
        super.visit(version, access, name, signature, supername, interfaces);
    }

    public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
        if (trans.isSynchronized())
            return new LocalMethodVisitor(super.visitMethod(access, name, desc, signature, exceptions));
        else
            return super.visitMethod(access, name, desc, signature, exceptions);
    }

    private class LocalMethodVisitor extends MethodVisitor {
        public LocalMethodVisitor(MethodVisitor arg0) {
            super(Opcodes.ASM5, arg0);
        }

        public void visitInsn(int opcode) {
            if (opcode == Opcodes.MONITORENTER)
                super.visitMethodInsn(Opcodes.INVOKESTATIC, ClassConfig.fake_prefix + "java/lang/Object",
                        "_fake_enter", "(Ljava/lang/Object;)V", false);
            else if (opcode == Opcodes.MONITOREXIT)
                super.visitMethodInsn(Opcodes.INVOKESTATIC, ClassConfig.fake_prefix + "java/lang/Object",
                        "_fake_leave", "(Ljava/lang/Object;)V", false);
            else
                super.visitInsn(opcode);
        }

        public void visitTypeInsn(int opcode, String s) {
            if (opcode == Opcodes.NEW && s.equals("java/lang/Object"))
                s = ClassConfig.fake_prefix + s;
            mv.visitTypeInsn(opcode, s);
        }

        public void visitMethodInsn(int opcode, String owner, String name, String desc, boolean itf) {
            if (opcode == Opcodes.INVOKESPECIAL && owner.equals("java/lang/Object") && name.equals("<init>"))
                mv.visitMethodInsn(opcode, ClassConfig.fake_prefix + owner, name, desc, itf);
            else
                mv.visitMethodInsn(opcode, owner, name, desc, itf);
        }
    }
}