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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.glowroot.shaded.objectweb.asm.commons;
import org.glowroot.shaded.objectweb.asm.ClassVisitor;
import org.glowroot.shaded.objectweb.asm.MethodVisitor;
import org.glowroot.shaded.objectweb.asm.Opcodes;
/**
* A {@link ClassVisitor} that merges clinit methods into a single one.
*
* @author Eric Bruneton
*/
public class StaticInitMerger extends ClassVisitor {
private String name;
private MethodVisitor clinit;
private final String prefix;
private int counter;
public StaticInitMerger(final String prefix, final ClassVisitor cv) {
this(Opcodes.ASM5, prefix, cv);
}
protected StaticInitMerger(final int api, final String prefix,
final ClassVisitor cv) {
super(api, cv);
this.prefix = prefix;
}
@Override
public void visit(final int version, final int access, final String name,
final String signature, final String superName,
final String[] interfaces) {
cv.visit(version, access, name, signature, superName, interfaces);
this.name = name;
}
@Override
public MethodVisitor visitMethod(final int access, final String name,
final String desc, final String signature, final String[] exceptions) {
MethodVisitor mv;
if ("".equals(name)) {
int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
String n = prefix + counter++;
mv = cv.visitMethod(a, n, desc, signature, exceptions);
if (clinit == null) {
clinit = cv.visitMethod(a, name, desc, null, null);
}
clinit.visitMethodInsn(Opcodes.INVOKESTATIC, this.name, n, desc,
false);
} else {
mv = cv.visitMethod(access, name, desc, signature, exceptions);
}
return mv;
}
@Override
public void visitEnd() {
if (clinit != null) {
clinit.visitInsn(Opcodes.RETURN);
clinit.visitMaxs(0, 0);
}
cv.visitEnd();
}
}
