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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 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 {@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);
}
}
