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package lombok.eclipse.agent;
import org.mangosdk.spi.ProviderFor;
import org.objectweb.asm.ClassAdapter;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import static org.objectweb.asm.Opcodes.*;
@ProviderFor(EclipseTransformer.class)
public class EclipseLinkedNodeFinderTransformer implements EclipseTransformer {
private static final String LINKED_NODE_FINDER = "org/eclipse/jdt/core/internal/corext/dom/LinkedNodeFinder";
@Override public String getTargetClassName() {
return LINKED_NODE_FINDER;
}
@Override public byte[] transform(byte[] in) {
ClassReader reader = new ClassReader(in);
ClassWriter writer = new ClassWriter(reader, 0);
ClassAdapter adapter = new LinkedNodeFinderPatcherAdapter(writer);
reader.accept(adapter, 0);
return writer.toByteArray();
}
private static class LinkedNodeFinderPatcherAdapter extends ClassAdapter {
private int originalAccess;
private String originalDesc;
private String originalSignature;
private String[] originalExceptions;
LinkedNodeFinderPatcherAdapter(ClassVisitor cv) {
super(cv);
}
@Override public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
if ( !name.equals("findByNode") ) return super.visitMethod(access, name, desc, signature, exceptions);
originalAccess = access;
originalDesc = desc;
originalSignature = signature;
originalExceptions = exceptions;
return super.visitMethod(0, "findByNode0", desc, signature, exceptions);
}
private static final String SIMPLENAME = "org/eclipse/jdt/core/dom/SimpleName";
private static final String SIMPLENAME_ARRAY = "[L" + SIMPLENAME + ";";
private static final String ASTNODE = "Lorg/eclipse/jdt/internal/compiler/ast/ASTNode;";
/*
* code generated by running ASMifier on:
*
public SimpleName[] findByNode(ASTNode a, SimpleName b) {
SimpleName[] ps = this.findByNode0(a, b);
int count = 0;
for (int i = 0; i < ps.length; i++) {
if ( ps[i] == null || ps[i].$generatedBy == null ) count++;
}
if (count == ps.length) return ps;
SimpleName[] newPs = new SimpleName[count];
count = 0;
for (int i = 0; i < ps.length; i++) {
if ( ps[i] == null || ps[i].p == null ) newPs[count++] = ps[i];
}
return newPs;
}
*/
@Override public void visitEnd() {
MethodVisitor mv = super.visitMethod(originalAccess, "findByNode", originalDesc, originalSignature, originalExceptions);
mv.visitCode();
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 2);
mv.visitMethodInsn(INVOKESPECIAL, LINKED_NODE_FINDER, "findByNode0", originalDesc);
mv.visitVarInsn(ASTORE, 3);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 4);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 5);
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitFrame(F_APPEND,3, new Object[] {SIMPLENAME_ARRAY, INTEGER, INTEGER}, 0, null);
mv.visitVarInsn(ILOAD, 5);
mv.visitVarInsn(ALOAD, 3);
mv.visitInsn(ARRAYLENGTH);
Label l1 = new Label();
mv.visitJumpInsn(IF_ICMPGE, l1);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ILOAD, 5);
mv.visitInsn(AALOAD);
Label l2 = new Label();
mv.visitJumpInsn(IFNULL, l2);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ILOAD, 5);
mv.visitInsn(AALOAD);
mv.visitFieldInsn(GETFIELD, SIMPLENAME, "$generatedBy", ASTNODE);
Label l3 = new Label();
mv.visitJumpInsn(IFNONNULL, l3);
mv.visitLabel(l2);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitIincInsn(4, 1);
mv.visitLabel(l3);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitIincInsn(5, 1);
mv.visitJumpInsn(GOTO, l0);
mv.visitLabel(l1);
mv.visitFrame(F_CHOP,1, null, 0, null);
mv.visitVarInsn(ILOAD, 4);
mv.visitVarInsn(ALOAD, 3);
mv.visitInsn(ARRAYLENGTH);
Label l4 = new Label();
mv.visitJumpInsn(IF_ICMPNE, l4);
mv.visitVarInsn(ALOAD, 3);
mv.visitInsn(ARETURN);
mv.visitLabel(l4);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitVarInsn(ILOAD, 4);
mv.visitTypeInsn(ANEWARRAY, SIMPLENAME);
mv.visitVarInsn(ASTORE, 5);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 4);
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 6);
Label l5 = new Label();
mv.visitLabel(l5);
mv.visitFrame(F_APPEND,2, new Object[] {SIMPLENAME_ARRAY, INTEGER}, 0, null);
mv.visitVarInsn(ILOAD, 6);
mv.visitVarInsn(ALOAD, 3);
mv.visitInsn(ARRAYLENGTH);
Label l6 = new Label();
mv.visitJumpInsn(IF_ICMPGE, l6);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ILOAD, 6);
mv.visitInsn(AALOAD);
Label l7 = new Label();
mv.visitJumpInsn(IFNULL, l7);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ILOAD, 6);
mv.visitInsn(AALOAD);
mv.visitFieldInsn(GETFIELD, SIMPLENAME, "$generatedBy", ASTNODE);
Label l8 = new Label();
mv.visitJumpInsn(IFNONNULL, l8);
mv.visitLabel(l7);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitVarInsn(ALOAD, 5);
mv.visitVarInsn(ILOAD, 4);
mv.visitIincInsn(4, 1);
mv.visitVarInsn(ALOAD, 3);
mv.visitVarInsn(ILOAD, 6);
mv.visitInsn(AALOAD);
mv.visitInsn(AASTORE);
mv.visitLabel(l8);
mv.visitFrame(F_SAME, 0, null, 0, null);
mv.visitIincInsn(6, 1);
mv.visitJumpInsn(GOTO, l5);
mv.visitLabel(l6);
mv.visitFrame(F_CHOP,1, null, 0, null);
mv.visitVarInsn(ALOAD, 5);
mv.visitInsn(ARETURN);
mv.visitMaxs(4, 7);
super.visitEnd();
}
}
}
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