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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * 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:
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 *    notice, this list of conditions and the following disclaimer.
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 *    notice, this list of conditions and the following disclaimer in the
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 *    this software without specific prior written permission.
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package jdk.internal.org.objectweb.asm.commons;

import jdk.internal.org.objectweb.asm.Handle;
import jdk.internal.org.objectweb.asm.Label;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;

A MethodVisitor that can be used to approximate method size.
Author:Eugene Kuleshov
/** * A {@link MethodVisitor} that can be used to approximate method size. * * @author Eugene Kuleshov */
public class CodeSizeEvaluator extends MethodVisitor implements Opcodes { private int minSize; private int maxSize; public CodeSizeEvaluator(final MethodVisitor mv) { this(Opcodes.ASM6, mv); } protected CodeSizeEvaluator(final int api, final MethodVisitor mv) { super(api, mv); } public int getMinSize() { return this.minSize; } public int getMaxSize() { return this.maxSize; } @Override public void visitInsn(final int opcode) { minSize += 1; maxSize += 1; if (mv != null) { mv.visitInsn(opcode); } } @Override public void visitIntInsn(final int opcode, final int operand) { if (opcode == SIPUSH) { minSize += 3; maxSize += 3; } else { minSize += 2; maxSize += 2; } if (mv != null) { mv.visitIntInsn(opcode, operand); } } @Override public void visitVarInsn(final int opcode, final int var) { if (var < 4 && opcode != RET) { minSize += 1; maxSize += 1; } else if (var >= 256) { minSize += 4; maxSize += 4; } else { minSize += 2; maxSize += 2; } if (mv != null) { mv.visitVarInsn(opcode, var); } } @Override public void visitTypeInsn(final int opcode, final String type) { minSize += 3; maxSize += 3; if (mv != null) { mv.visitTypeInsn(opcode, type); } } @Override public void visitFieldInsn(final int opcode, final String owner, final String name, final String desc) { minSize += 3; maxSize += 3; if (mv != null) { mv.visitFieldInsn(opcode, owner, name, desc); } } @Deprecated @Override public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc) { if (api >= Opcodes.ASM5) { super.visitMethodInsn(opcode, owner, name, desc); return; } doVisitMethodInsn(opcode, owner, name, desc, opcode == Opcodes.INVOKEINTERFACE); } @Override public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc, final boolean itf) { if (api < Opcodes.ASM5) { super.visitMethodInsn(opcode, owner, name, desc, itf); return; } doVisitMethodInsn(opcode, owner, name, desc, itf); } private void doVisitMethodInsn(int opcode, final String owner, final String name, final String desc, final boolean itf) { if (opcode == INVOKEINTERFACE) { minSize += 5; maxSize += 5; } else { minSize += 3; maxSize += 3; } if (mv != null) { mv.visitMethodInsn(opcode, owner, name, desc, itf); } } @Override public void visitInvokeDynamicInsn(String name, String desc, Handle bsm, Object... bsmArgs) { minSize += 5; maxSize += 5; if (mv != null) { mv.visitInvokeDynamicInsn(name, desc, bsm, bsmArgs); } } @Override public void visitJumpInsn(final int opcode, final Label label) { minSize += 3; if (opcode == GOTO || opcode == JSR) { maxSize += 5; } else { maxSize += 8; } if (mv != null) { mv.visitJumpInsn(opcode, label); } } @Override public void visitLdcInsn(final Object cst) { if (cst instanceof Long || cst instanceof Double) { minSize += 3; maxSize += 3; } else { minSize += 2; maxSize += 3; } if (mv != null) { mv.visitLdcInsn(cst); } } @Override public void visitIincInsn(final int var, final int increment) { if (var > 255 || increment > 127 || increment < -128) { minSize += 6; maxSize += 6; } else { minSize += 3; maxSize += 3; } if (mv != null) { mv.visitIincInsn(var, 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; if (mv != null) { mv.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; if (mv != null) { mv.visitLookupSwitchInsn(dflt, keys, labels); } } @Override public void visitMultiANewArrayInsn(final String desc, final int dims) { minSize += 4; maxSize += 4; if (mv != null) { mv.visitMultiANewArrayInsn(desc, dims); } } }