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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.optimizer;
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.commons.Remapper;
import org.objectweb.asm.commons.RemappingMethodAdapter;
/**
* A {@link MethodVisitor} that renames fields and methods, and removes debug
* info.
*
* @author Eugene Kuleshov
*/
public class MethodOptimizer extends RemappingMethodAdapter implements Opcodes {
private final ClassOptimizer classOptimizer;
public MethodOptimizer(ClassOptimizer classOptimizer, int access,
String desc, MethodVisitor mv, Remapper remapper) {
super(access, desc, mv, remapper);
this.classOptimizer = classOptimizer;
}
// ------------------------------------------------------------------------
// Overridden methods
// ------------------------------------------------------------------------
@Override
public AnnotationVisitor visitAnnotationDefault() {
// remove annotations
return null;
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
// remove annotations
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 to foo$(class) for 1.2 compatibility
String ldcName = ((Type) cst).getInternalName();
String fieldName = "class$" + ldcName.replace('/', '$');
FieldVisitor fv = classOptimizer.syntheticFieldVisitor(ACC_STATIC
| ACC_SYNTHETIC, fieldName, "Ljava/lang/Class;");
fv.visitEnd();
if (!classOptimizer.class$) {
MethodVisitor mv = classOptimizer.visitMethod(ACC_STATIC
| ACC_SYNTHETIC, "class$",
"(Ljava/lang/String;)Ljava/lang/Class;", null, null);
mv.visitCode();
Label l0 = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitTryCatchBlock(l0, l1, l2,
"java/lang/ClassNotFoundException");
mv.visitLabel(l0);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESTATIC, "java/lang/Class", "forName",
"(Ljava/lang/String;)Ljava/lang/Class;");
mv.visitLabel(l1);
mv.visitInsn(ARETURN);
mv.visitLabel(l2);
mv.visitMethodInsn(INVOKEVIRTUAL,
"java/lang/ClassNotFoundException", "getMessage",
"()Ljava/lang/String;");
mv.visitVarInsn(ASTORE, 1);
mv.visitTypeInsn(NEW, "java/lang/NoClassDefFoundError");
mv.visitInsn(DUP);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/NoClassDefFoundError",
"", "(Ljava/lang/String;)V");
mv.visitInsn(ATHROW);
mv.visitMaxs(3, 2);
mv.visitEnd();
classOptimizer.class$ = true;
}
String clsName = classOptimizer.clsName;
mv.visitFieldInsn(GETSTATIC, clsName, fieldName, "Ljava/lang/Class;");
Label elseLabel = new Label();
mv.visitJumpInsn(IFNONNULL, elseLabel);
mv.visitLdcInsn(ldcName.replace('/', '.'));
mv.visitMethodInsn(INVOKESTATIC, clsName, "class$",
"(Ljava/lang/String;)Ljava/lang/Class;");
mv.visitInsn(DUP);
mv.visitFieldInsn(PUTSTATIC, clsName, fieldName, "Ljava/lang/Class;");
Label endLabel = new Label();
mv.visitJumpInsn(GOTO, endLabel);
mv.visitLabel(elseLabel);
mv.visitFieldInsn(GETSTATIC, clsName, fieldName, "Ljava/lang/Class;");
mv.visitLabel(endLabel);
}
}
