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/*
* Copyright (C) 2010-2012 The Project Lombok Authors.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.bytecode;
import static lombok.bytecode.AsmUtil.fixJSRInlining;
import java.util.concurrent.atomic.AtomicBoolean;
import lombok.core.DiagnosticsReceiver;
import lombok.core.PostCompilerTransformation;
import org.mangosdk.spi.ProviderFor;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
@ProviderFor(PostCompilerTransformation.class)
public class PreventNullAnalysisRemover implements PostCompilerTransformation {
@Override public byte[] applyTransformations(byte[] original, String fileName, DiagnosticsReceiver diagnostics) {
if (!new ClassFileMetaData(original).usesMethod("lombok/Lombok", "preventNullAnalysis")) return null;
byte[] fixedByteCode = fixJSRInlining(original);
ClassReader reader = new ClassReader(fixedByteCode);
ClassWriter writer = new FixedClassWriter(reader, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
final AtomicBoolean changesMade = new AtomicBoolean();
class PreventNullanalysisVisitor extends MethodVisitor {
PreventNullanalysisVisitor(MethodVisitor mv) {
super(Opcodes.ASM4, mv);
}
@Override public void visitMethodInsn(int opcode, String owner, String name, String desc) {
boolean hit = true;
if (hit && opcode != Opcodes.INVOKESTATIC) hit = false;
if (hit && !"preventNullAnalysis".equals(name)) hit = false;
if (hit && !"lombok/Lombok".equals(owner)) hit = false;
if (hit && !"(Ljava/lang/Object;)Ljava/lang/Object;".equals(desc)) hit = false;
if (hit) {
changesMade.set(true);
} else {
super.visitMethodInsn(opcode, owner, name, desc);
}
}
}
reader.accept(new ClassVisitor(Opcodes.ASM4, writer) {
@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
return new PreventNullanalysisVisitor(super.visitMethod(access, name, desc, signature, exceptions));
}
}, 0);
return changesMade.get() ? writer.toByteArray() : null;
}
}
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