org.objectweb.asm.optimizer.MethodOptimizer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of asm-util Show documentation
Show all versions of asm-util Show documentation
Utilities for ASM, a very small and fast Java bytecode manipulation framework
/***
* 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.optimizer;
import java.util.HashMap;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.TypePath;
import org.objectweb.asm.commons.Remapper;
import org.objectweb.asm.commons.MethodRemapper;
/**
* A {@link MethodVisitor} that renames fields and methods, and removes debug
* info.
*
* @author Eugene Kuleshov
*/
public class MethodOptimizer extends MethodRemapper implements Opcodes {
private final ClassOptimizer classOptimizer;
public MethodOptimizer(ClassOptimizer classOptimizer, MethodVisitor mv,
Remapper remapper) {
super(Opcodes.ASM5, mv, remapper);
this.classOptimizer = classOptimizer;
}
// ------------------------------------------------------------------------
// Overridden methods
// ------------------------------------------------------------------------
@Override
public void visitParameter(String name, int access) {
// remove parameter info
}
@Override
public AnnotationVisitor visitAnnotationDefault() {
// remove annotations
return null;
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
// remove annotations
return null;
}
@Override
public AnnotationVisitor visitTypeAnnotation(int typeRef,
TypePath typePath, String desc, boolean visible) {
return null;
}
@Override
public AnnotationVisitor visitParameterAnnotation(final int parameter,
final String desc, final boolean visible) {
// remove annotations
return null;
}
@Override
public void visitLocalVariable(final String name, final String desc,
final String signature, final Label start, final Label end,
final int index) {
// remove debug info
}
@Override
public void visitLineNumber(final int line, final Label start) {
// remove debug info
}
@Override
public void visitFrame(int type, int local, Object[] local2, int stack,
Object[] stack2) {
// remove frame info
}
@Override
public void visitAttribute(Attribute attr) {
// remove non standard attributes
}
@Override
public void visitLdcInsn(Object cst) {
if (!(cst instanceof Type)) {
super.visitLdcInsn(cst);
return;
}
// transform Foo.class for 1.2 compatibility
String ldcName = ((Type) cst).getInternalName();
String fieldName = "class$" + ldcName.replace('/', '$');
if (!classOptimizer.syntheticClassFields.contains(ldcName)) {
classOptimizer.syntheticClassFields.add(ldcName);
FieldVisitor fv = classOptimizer.syntheticFieldVisitor(ACC_STATIC
| ACC_SYNTHETIC, fieldName, "Ljava/lang/Class;");
fv.visitEnd();
}
String clsName = classOptimizer.clsName;
mv.visitFieldInsn(GETSTATIC, clsName, fieldName, "Ljava/lang/Class;");
}
@Override
public void visitMethodInsn(int opcode, String owner, String name,
String desc, boolean itf) {
// rewrite boxing method call to use constructor to keep 1.3/1.4
// compatibility
String[] constructorParams;
if (opcode == INVOKESTATIC && name.equals("valueOf")
&& (constructorParams = BOXING_MAP.get(owner + desc)) != null) {
String type = constructorParams[0];
String initDesc = constructorParams[1];
super.visitTypeInsn(NEW, type);
super.visitInsn(DUP);
super.visitInsn((initDesc == "(J)V" || initDesc == "(D)V") ? DUP2_X2
: DUP2_X1);
super.visitInsn(POP2);
super.visitMethodInsn(INVOKESPECIAL, type, "", initDesc,
false);
return;
}
super.visitMethodInsn(opcode, owner, name, desc, itf);
}
private static final HashMap BOXING_MAP;
static {
String[][] boxingNames = {
// Boolean.valueOf is 1.4 and is used by the xml package, so no
// rewrite
{ "java/lang/Byte", "(B)V" }, { "java/lang/Short", "(S)V" },
{ "java/lang/Character", "(C)V" },
{ "java/lang/Integer", "(I)V" }, { "java/lang/Long", "(J)V" },
{ "java/lang/Float", "(F)V" }, { "java/lang/Double", "(D)V" }, };
HashMap map = new HashMap();
for (String[] boxingName : boxingNames) {
String wrapper = boxingName[0];
String desc = boxingName[1];
String boxingMethod = wrapper + '(' + desc.charAt(1) + ")L"
+ wrapper + ';';
map.put(boxingMethod, boxingName);
}
BOXING_MAP = map;
}
}