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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* 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.eclipse.agent;
import org.objectweb.asm.ClassAdapter;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodAdapter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Transforms Eclipse's <code>org.eclipse.jdt.core.dom.ASTConverter</code> class, which sometimes rescans bits and pieces
* of source files because Eclipse's own AST doesn't actually have enough information for eclipse (why they don't just fix
* the AST tree generator is beyond me). At any rate, for catch blocks generated by lombok, eclipse tries to rescan the
* source file to find the source position of the catch statement, which will of course fail as there's nothing there.
* We will fix the code to return the original starting position, which is a pretty good simile, instead of '-1', which
* screws up all sorts of things.
*
* Transformations applied:<ul>
* <li>The <code>retrieveStartingCatchPosition(int, int)</code> method is instrumented to return its first parameter
* instead of the constant -1.</li></ul>
*/
class EclipseASTConverterTransformer {
byte[] transform(byte[] classfileBuffer) {
ClassReader reader = new ClassReader(classfileBuffer);
ClassWriter writer = new ClassWriter(reader, 0);
ClassAdapter adapter = new ASTConverterPatcherAdapter(writer);
reader.accept(adapter, 0);
return writer.toByteArray();
}
static RuntimeException sneakyThrow(Throwable t) {
if ( t == null ) throw new NullPointerException("t");
EclipseASTConverterTransformer.<RuntimeException>sneakyThrow0(t);
return null;
}
@SuppressWarnings("unchecked")
private static <T extends Throwable> void sneakyThrow0(Throwable t) throws T {
throw (T)t;
}
private static class ASTConverterPatcherAdapter extends ClassAdapter {
public ASTConverterPatcherAdapter(ClassVisitor cv) {
super(cv);
}
@Override public MethodVisitor visitMethod(int access, String name, String desc,
String signature, String[] exceptions) {
MethodVisitor writerVisitor = super.visitMethod(access, name, desc, signature, exceptions);
if ( !name.equals("retrieveStartingCatchPosition") ) return writerVisitor;
return new RetrieveStartingCatchPositionPatcher(writerVisitor);
}
}
static class RetrieveStartingCatchPositionPatcher extends MethodAdapter {
RetrieveStartingCatchPositionPatcher(MethodVisitor mv) {
super(mv);
}
int count = 0;
@Override public void visitInsn(int opcode) {
if ( opcode == Opcodes.IRETURN ) {
if ( count++ == 0 ) {
super.visitInsn(opcode);
return;
}
//replaces: "return -1" with "return [firstParam]";
super.visitInsn(Opcodes.POP);
super.visitVarInsn(Opcodes.ILOAD, 1);
super.visitInsn(Opcodes.IRETURN);
} else {
super.visitInsn(opcode);
}
}
}
}
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