Package ch3.sec3

Source Code of ch3.sec3.AddTimerAdapter2

/***
* ASM Guide
* Copyright (c) 2007 Eric Bruneton
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
*    contributors may be used to endorse or promote products derived from
*    this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/

package ch3.sec3;

import static org.objectweb.asm.Opcodes.ACC_INTERFACE;
import static org.objectweb.asm.Opcodes.ACC_PUBLIC;
import static org.objectweb.asm.Opcodes.ACC_STATIC;
import static org.objectweb.asm.Opcodes.ATHROW;
import static org.objectweb.asm.Opcodes.GETSTATIC;
import static org.objectweb.asm.Opcodes.INVOKESTATIC;
import static org.objectweb.asm.Opcodes.IRETURN;
import static org.objectweb.asm.Opcodes.LADD;
import static org.objectweb.asm.Opcodes.LSUB;
import static org.objectweb.asm.Opcodes.PUTSTATIC;
import static org.objectweb.asm.Opcodes.RETURN;

import org.objectweb.asm.ClassAdapter;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.commons.AnalyzerAdapter;

/**
* ASM Guide example class.
*
* @author Eric Bruneton
*/
public class AddTimerAdapter2 extends ClassAdapter {

  private String owner;

  private boolean isInterface;

  public AddTimerAdapter2(ClassVisitor cv) {
    super(cv);
  }

  public void visit(int version, int access, String name,
      String signature, String superName, String[] interfaces) {
    cv.visit(version, access, name, signature, superName, interfaces);
    owner = name;
    isInterface = (access & ACC_INTERFACE) != 0;
  }

  public MethodVisitor visitMethod(int access, String name,
      String desc, String signature, String[] exceptions) {
    MethodVisitor mv = cv.visitMethod(access, name, desc, signature,
        exceptions);
    if (!isInterface && mv != null && !name.equals("<init>")) {
      mv = new AddTimerMethodAdapter2(owner, access, name, desc, mv);
    }
    return mv;
  }

  public void visitEnd() {
    if (!isInterface) {
      FieldVisitor fv = cv.visitField(ACC_PUBLIC + ACC_STATIC, "timer",
          "J", null, null);
      if (fv != null) {
        fv.visitEnd();
      }
      cv.visitEnd();
    }
  }

  class AddTimerMethodAdapter2 extends AnalyzerAdapter {

    private int maxStack;

    public AddTimerMethodAdapter2(String owner, int access,
        String name, String desc, MethodVisitor mv) {
      super(owner, access, name, desc, mv);
    }

    public void visitCode() {
      super.visitCode();
      mv.visitFieldInsn(GETSTATIC, owner, "timer", "J");
      mv.visitMethodInsn(INVOKESTATIC, "java/lang/System",
          "currentTimeMillis", "()J");
      mv.visitInsn(LSUB);
      mv.visitFieldInsn(PUTSTATIC, owner, "timer", "J");
      maxStack = 4;
    }

    public void visitInsn(int opcode) {
      if ((opcode >= IRETURN && opcode <= RETURN) || opcode == ATHROW) {
        mv.visitFieldInsn(GETSTATIC, owner, "timer", "J");
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/System",
            "currentTimeMillis", "()J");
        mv.visitInsn(LADD);
        mv.visitFieldInsn(PUTSTATIC, owner, "timer", "J");
        maxStack = Math.max(maxStack, stack.size() + 4);
      }
      super.visitInsn(opcode);
    }

    public void visitMaxs(int maxStack, int maxLocals) {
      super.visitMaxs(Math.max(this.maxStack, maxStack), maxLocals);
    }
  }
}
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