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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.
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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// 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 aj.org.objectweb.asm.commons;

import aj.org.objectweb.asm.ConstantDynamic;
import aj.org.objectweb.asm.Handle;
import aj.org.objectweb.asm.Label;
import aj.org.objectweb.asm.MethodVisitor;
import aj.org.objectweb.asm.Opcodes;

/**
 * A {@link MethodVisitor} that approximates the size of the methods it visits.
 *
 * @author Eugene Kuleshov
 */
public class CodeSizeEvaluator extends MethodVisitor implements Opcodes {

  /** The minimum size in bytes of the visited method. */
  private int minSize;

  /** The maximum size in bytes of the visited method. */
  private int maxSize;

  public CodeSizeEvaluator(final MethodVisitor methodVisitor) {
    this(/* latest api = */ Opcodes.ASM9, methodVisitor);
  }

  protected CodeSizeEvaluator(final int api, final MethodVisitor methodVisitor) {
    super(api, methodVisitor);
  }

  public int getMinSize() {
    return this.minSize;
  }

  public int getMaxSize() {
    return this.maxSize;
  }

  @Override
  public void visitInsn(final int opcode) {
    minSize += 1;
    maxSize += 1;
    super.visitInsn(opcode);
  }

  @Override
  public void visitIntInsn(final int opcode, final int operand) {
    if (opcode == SIPUSH) {
      minSize += 3;
      maxSize += 3;
    } else {
      minSize += 2;
      maxSize += 2;
    }
    super.visitIntInsn(opcode, operand);
  }

  @Override
  public void visitVarInsn(final int opcode, final int varIndex) {
    if (varIndex < 4 && opcode != RET) {
      minSize += 1;
      maxSize += 1;
    } else if (varIndex >= 256) {
      minSize += 4;
      maxSize += 4;
    } else {
      minSize += 2;
      maxSize += 2;
    }
    super.visitVarInsn(opcode, varIndex);
  }

  @Override
  public void visitTypeInsn(final int opcode, final String type) {
    minSize += 3;
    maxSize += 3;
    super.visitTypeInsn(opcode, type);
  }

  @Override
  public void visitFieldInsn(
      final int opcode, final String owner, final String name, final String descriptor) {
    minSize += 3;
    maxSize += 3;
    super.visitFieldInsn(opcode, owner, name, descriptor);
  }

  @Override
  public void visitMethodInsn(
      final int opcodeAndSource,
      final String owner,
      final String name,
      final String descriptor,
      final boolean isInterface) {
    if (api < Opcodes.ASM5 && (opcodeAndSource & Opcodes.SOURCE_DEPRECATED) == 0) {
      // Redirect the call to the deprecated version of this method.
      super.visitMethodInsn(opcodeAndSource, owner, name, descriptor, isInterface);
      return;
    }
    int opcode = opcodeAndSource & ~Opcodes.SOURCE_MASK;

    if (opcode == INVOKEINTERFACE) {
      minSize += 5;
      maxSize += 5;
    } else {
      minSize += 3;
      maxSize += 3;
    }
    super.visitMethodInsn(opcodeAndSource, owner, name, descriptor, isInterface);
  }

  @Override
  public void visitInvokeDynamicInsn(
      final String name,
      final String descriptor,
      final Handle bootstrapMethodHandle,
      final Object... bootstrapMethodArguments) {
    minSize += 5;
    maxSize += 5;
    super.visitInvokeDynamicInsn(name, descriptor, bootstrapMethodHandle, bootstrapMethodArguments);
  }

  @Override
  public void visitJumpInsn(final int opcode, final Label label) {
    minSize += 3;
    if (opcode == GOTO || opcode == JSR) {
      maxSize += 5;
    } else {
      maxSize += 8;
    }
    super.visitJumpInsn(opcode, label);
  }

  @Override
  public void visitLdcInsn(final Object value) {
    if (value instanceof Long
        || value instanceof Double
        || (value instanceof ConstantDynamic && ((ConstantDynamic) value).getSize() == 2)) {
      minSize += 3;
      maxSize += 3;
    } else {
      minSize += 2;
      maxSize += 3;
    }
    super.visitLdcInsn(value);
  }

  @Override
  public void visitIincInsn(final int varIndex, final int increment) {
    if (varIndex > 255 || increment > 127 || increment < -128) {
      minSize += 6;
      maxSize += 6;
    } else {
      minSize += 3;
      maxSize += 3;
    }
    super.visitIincInsn(varIndex, increment);
  }

  @Override
  public void visitTableSwitchInsn(
      final int min, final int max, final Label dflt, final Label... labels) {
    minSize += 13 + labels.length * 4;
    maxSize += 16 + labels.length * 4;
    super.visitTableSwitchInsn(min, max, dflt, labels);
  }

  @Override
  public void visitLookupSwitchInsn(final Label dflt, final int[] keys, final Label[] labels) {
    minSize += 9 + keys.length * 8;
    maxSize += 12 + keys.length * 8;
    super.visitLookupSwitchInsn(dflt, keys, labels);
  }

  @Override
  public void visitMultiANewArrayInsn(final String descriptor, final int numDimensions) {
    minSize += 4;
    maxSize += 4;
    super.visitMultiANewArrayInsn(descriptor, numDimensions);
  }
}