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package lombok.eclipse.agent;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
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.MethodAdapter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
class EclipseParserTransformer {
private static final String COMPILER_PKG =
"Lorg/eclipse/jdt/internal/compiler/ast/";
private static final String TARGET_STATIC_CLASS = "java/lombok/eclipse/ClassLoaderWorkaround";
private static final String TARGET_STATIC_METHOD_NAME = "transformCompilationUnitDeclaration";
private static final String TARGET_STATIC_METHOD_DESC = "(Ljava/lang/Object;Ljava/lang/Object;)V";
private static final Map<String, Class<? extends MethodVisitor>> rewriters;
static {
Map<String, Class<? extends MethodVisitor>> map = new HashMap<String, Class<? extends MethodVisitor>>();
map.put(String.format("endParse(I)%sCompilationUnitDeclaration;", COMPILER_PKG), EndParsePatcher.class);
map.put(String.format("getMethodBodies(%sCompilationUnitDeclaration;)V", COMPILER_PKG), GetMethodBodiesPatcher.class);
map.put(String.format("parse(%1$sMethodDeclaration;%1$sCompilationUnitDeclaration;)V", COMPILER_PKG), ParseBlockContainerPatcher.class);
map.put(String.format("parse(%1$sConstructorDeclaration;%1$sCompilationUnitDeclaration;Z)V", COMPILER_PKG), ParseBlockContainerPatcher.class);
map.put(String.format("parse(%1$sInitializer;%1$sTypeDeclaration;%1$sCompilationUnitDeclaration;)V", COMPILER_PKG), ParseBlockContainerPatcher.class);
rewriters = Collections.unmodifiableMap(map);
}
public byte[] transform(byte[] classfileBuffer) {
ClassReader reader = new ClassReader(classfileBuffer);
ClassWriter writer = new ClassWriter(reader, 0);
ClassAdapter adapter = new ParserPatcherAdapter(writer);
reader.accept(adapter, 0);
return writer.toByteArray();
}
public static RuntimeException sneakyThrow(Throwable t) {
if ( t == null ) throw new NullPointerException("t");
EclipseParserTransformer.<RuntimeException>sneakyThrow0(t);
return null;
}
@SuppressWarnings("unchecked")
private static <T extends Throwable> void sneakyThrow0(Throwable t) throws T {
throw (T)t;
}
private static class ParserPatcherAdapter extends ClassAdapter {
public ParserPatcherAdapter(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);
Class<? extends MethodVisitor> targetVisitorClass = rewriters.get(name+desc);
if ( targetVisitorClass == null ) return writerVisitor;
try {
Constructor<? extends MethodVisitor> c = targetVisitorClass.getDeclaredConstructor(MethodVisitor.class);
c.setAccessible(true);
return c.newInstance(writerVisitor);
} catch ( InvocationTargetException e ) {
throw sneakyThrow(e.getCause());
} catch ( Exception e ) {
//NoSuchMethodException: We know they exist.
//IllegalAccessException: We called setAccessible.
//InstantiationException: None of these classes are abstract.
throw sneakyThrow(e);
}
}
}
private static final int BIT24 = 0x800000;
static class GetMethodBodiesPatcher extends MethodAdapter {
GetMethodBodiesPatcher(MethodVisitor mv) {
super(mv);
}
@Override public void visitInsn(int opcode) {
if ( opcode == Opcodes.RETURN ) {
//injects: ClassLoaderWorkaround.transformCUD(parser, compilationUnitDeclaration);
super.visitVarInsn(Opcodes.ALOAD, 0);
super.visitVarInsn(Opcodes.ALOAD, 1);
super.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET_STATIC_CLASS,
TARGET_STATIC_METHOD_NAME, TARGET_STATIC_METHOD_DESC);
}
super.visitInsn(opcode);
}
}
static class ParseBlockContainerPatcher extends MethodAdapter {
ParseBlockContainerPatcher(MethodVisitor mv) {
super(mv);
}
@Override public void visitCode() {
//injects: if ( constructorDeclaration.bits & BIT24 > 0 ) return;
mv.visitVarInsn(Opcodes.ALOAD, 1);
mv.visitFieldInsn(Opcodes.GETFIELD, "org/eclipse/jdt/internal/compiler/ast/ASTNode", "bits", "I");
mv.visitLdcInsn(Integer.valueOf(BIT24));
mv.visitInsn(Opcodes.IAND);
Label l0 = new Label();
mv.visitJumpInsn(Opcodes.IFLE, l0);
mv.visitInsn(Opcodes.RETURN);
mv.visitLabel(l0);
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
super.visitCode();
}
}
static class EndParsePatcher extends MethodAdapter {
private static final String TARGET_STATIC_METHOD_NAME = "transformCompilationUnitDeclaration";
EndParsePatcher(MethodVisitor mv) {
super(mv);
}
@Override public void visitInsn(int opcode) {
if ( opcode == Opcodes.ARETURN ) {
//injects: ClassLoaderWorkaround.transformCUD(parser, compilationUnitDeclaration);
super.visitInsn(Opcodes.DUP);
super.visitVarInsn(Opcodes.ALOAD, 0);
super.visitInsn(Opcodes.SWAP);
super.visitMethodInsn(Opcodes.INVOKESTATIC, TARGET_STATIC_CLASS,
TARGET_STATIC_METHOD_NAME, TARGET_STATIC_METHOD_DESC);
}
super.visitInsn(opcode);
}
}
}
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