// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
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package org.objectweb.asm.commons;

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

A MethodVisitor that approximates the size of the methods it visits.
Author:Eugene Kuleshov
/** * 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.
/** The minimum size in bytes of the visited method. */
private int minSize;
The maximum size in bytes of the visited method.
/** 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 var) { if (var < 4 && opcode != RET) { minSize += 1; maxSize += 1; } else if (var >= 256) { minSize += 4; maxSize += 4; } else { minSize += 2; maxSize += 2; } super.visitVarInsn(opcode, var); } @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 var, final int increment) { if (var > 255 || increment > 127 || increment < -128) { minSize += 6; maxSize += 6; } else { minSize += 3; maxSize += 3; } super.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; 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); } }