protected void injectGetIndex(ClassWriter classWriter) {
MethodVisitor mv =
classWriter.visitMethod(ACC_PRIVATE, "getIndex", "(Ljava/lang/String;)I", null, null);
mv.visitCode();
mv.visitInsn(ICONST_0);
mv.visitVarInsn(ISTORE, 2);
Label forLoopLabel = new Label();
mv.visitLabel(forLoopLabel);
mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] {Opcodes.INTEGER}, 0, null);
mv.visitVarInsn(ILOAD, 2);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(
GETFIELD,
getAccessorNameInternal(this.getTarget(), this.getAccessorType()),
"fieldTable",
"[Ljava/lang/reflect/Field;");
mv.visitInsn(ARRAYLENGTH);
Label forLoopIncrementLabel = new Label();
mv.visitJumpInsn(IF_ICMPGE, forLoopIncrementLabel);
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(
GETFIELD,
getAccessorNameInternal(this.getTarget(), this.getAccessorType()),
"fieldTable",
"[Ljava/lang/reflect/Field;");
mv.visitVarInsn(ILOAD, 2);
mv.visitInsn(AALOAD);
mv.visitMethodInsn(
INVOKEVIRTUAL, "java/lang/reflect/Field", "getName", "()Ljava/lang/String;", false);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z", false);
Label equalsLabel = new Label();
mv.visitJumpInsn(IFEQ, equalsLabel);
mv.visitVarInsn(ILOAD, 2);
mv.visitInsn(IRETURN);
mv.visitLabel(equalsLabel);
mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
mv.visitIincInsn(2, 1);
mv.visitJumpInsn(GOTO, forLoopLabel);
mv.visitLabel(forLoopIncrementLabel);
mv.visitFrame(Opcodes.F_CHOP, 1, null, 0, null);
mv.visitInsn(ICONST_M1);
mv.visitInsn(IRETURN);
mv.visitMaxs(2, 3);
mv.visitEnd();
}
protected void injectConstructor(ClassWriter classWriter) {
String resultName = getAccessorNameInternal(this.getTarget(), this.getAccessorType());
MethodVisitor methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
;
methodVisitor.visitTypeInsn(NEW, "java/util/ArrayList");
methodVisitor.visitInsn(DUP);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/util/ArrayList", "<init>", "()V", false);
methodVisitor.visitVarInsn(ASTORE, 1);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(
INVOKEVIRTUAL, resultName, "getTargetClass", "()Ljava/lang/Class;", false);
methodVisitor.visitVarInsn(ASTORE, 2);
Label whileLoop = new Label(); // enter the "while (currentClass != Object.class)" loop
methodVisitor.visitLabel(whileLoop);
methodVisitor.visitFrame(
Opcodes.F_FULL,
3,
new Object[] {resultName, "java/util/List", "java/lang/Class"},
0,
new Object[] {});
methodVisitor.visitVarInsn(ALOAD, 2);
methodVisitor.visitLdcInsn(Type.getType("Ljava/lang/Object;"));
Label classNotObjectComparer =
new Label(); // compares the current class to Object.class aka currentClass != Object.class
methodVisitor.visitJumpInsn(IF_ACMPEQ, classNotObjectComparer);
methodVisitor.visitVarInsn(ALOAD, 2);
methodVisitor.visitMethodInsn(
INVOKEVIRTUAL,
"java/lang/Class",
"getDeclaredFields",
"()[Ljava/lang/reflect/Field;",
false);
methodVisitor.visitVarInsn(ASTORE, 3);
methodVisitor.visitVarInsn(ALOAD, 3);
methodVisitor.visitInsn(ARRAYLENGTH);
methodVisitor.visitVarInsn(ISTORE, 4);
methodVisitor.visitInsn(ICONST_0);
methodVisitor.visitVarInsn(ISTORE, 5);
Label cachingForLoop = new Label(); // this loop handles the storing of the fields (to the list)
methodVisitor.visitLabel(cachingForLoop);
methodVisitor.visitFrame(
Opcodes.F_APPEND,
3,
new Object[] {"[Ljava/lang/reflect/Field;", Opcodes.INTEGER, Opcodes.INTEGER},
0,
null);
methodVisitor.visitVarInsn(ILOAD, 5);
methodVisitor.visitVarInsn(ILOAD, 4);
Label cachingForLoopIncrementLabel = new Label(); // handles the looping of the fields
methodVisitor.visitJumpInsn(IF_ICMPGE, cachingForLoopIncrementLabel);
methodVisitor.visitVarInsn(ALOAD, 3);
methodVisitor.visitVarInsn(ILOAD, 5);
methodVisitor.visitInsn(AALOAD);
methodVisitor.visitVarInsn(ASTORE, 6);
methodVisitor.visitVarInsn(ALOAD, 1);
methodVisitor.visitVarInsn(ALOAD, 6);
methodVisitor.visitMethodInsn(
INVOKEINTERFACE, "java/util/List", "add", "(Ljava/lang/Object;)Z", true);
methodVisitor.visitInsn(POP);
methodVisitor.visitIincInsn(5, 1);
methodVisitor.visitJumpInsn(GOTO, cachingForLoop);
methodVisitor.visitLabel(cachingForLoopIncrementLabel);
methodVisitor.visitFrame(Opcodes.F_CHOP, 3, null, 0, null);
methodVisitor.visitVarInsn(ALOAD, 2);
methodVisitor.visitMethodInsn(
INVOKEVIRTUAL, "java/lang/Class", "getSuperclass", "()Ljava/lang/Class;", false);
methodVisitor.visitVarInsn(ASTORE, 2);
methodVisitor.visitJumpInsn(GOTO, whileLoop);
methodVisitor.visitLabel(classNotObjectComparer);
methodVisitor.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitVarInsn(ALOAD, 1);
methodVisitor.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "size", "()I", true);
methodVisitor.visitTypeInsn(ANEWARRAY, "java/lang/reflect/Field");
methodVisitor.visitFieldInsn(PUTFIELD, resultName, "fieldTable", "[Ljava/lang/reflect/Field;");
methodVisitor.visitInsn(ICONST_0);
methodVisitor.visitVarInsn(ISTORE, 3);
Label storingForLoop =
new Label(); // this for loop goes about storing the fields in the array defined in the
// class
methodVisitor.visitLabel(storingForLoop);
methodVisitor.visitFrame(Opcodes.F_APPEND, 1, new Object[] {Opcodes.INTEGER}, 0, null);
methodVisitor.visitVarInsn(ILOAD, 3);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitFieldInsn(GETFIELD, resultName, "fieldTable", "[Ljava/lang/reflect/Field;");
methodVisitor.visitInsn(ARRAYLENGTH);
Label storage =
new Label(); // gets the field at position x and stores it in the cache (fieldTable)
methodVisitor.visitJumpInsn(IF_ICMPGE, storage);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitFieldInsn(GETFIELD, resultName, "fieldTable", "[Ljava/lang/reflect/Field;");
methodVisitor.visitVarInsn(ILOAD, 3);
methodVisitor.visitVarInsn(ALOAD, 1);
methodVisitor.visitVarInsn(ILOAD, 3);
methodVisitor.visitMethodInsn(
INVOKEINTERFACE, "java/util/List", "get", "(I)Ljava/lang/Object;", true);
methodVisitor.visitTypeInsn(CHECKCAST, "java/lang/reflect/Field");
methodVisitor.visitInsn(AASTORE);
methodVisitor.visitIincInsn(3, 1);
methodVisitor.visitJumpInsn(GOTO, storingForLoop);
methodVisitor.visitLabel(storage);
methodVisitor.visitFrame(Opcodes.F_CHOP, 1, null, 0, null);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(4, 7);
methodVisitor.visitEnd();
}
