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Panda Glue is a ASM/AOP module of the Panda Framework.
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package panda.aop.asm;

import panda.asm.MethodVisitor;
import panda.asm.Opcodes;
import panda.asm.Type;

final class AsmHelper implements Opcodes {

	static boolean packagePrivateData(Type type, MethodVisitor mv) {
		if (type.equals(Type.BOOLEAN_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;");
		}
		else if (type.equals(Type.BYTE_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;");
		}
		else if (type.equals(Type.CHAR_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;");
		}
		else if (type.equals(Type.SHORT_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Short", "valueOf", "(S)Ljava/lang/Short;");
		}
		else if (type.equals(Type.INT_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;");
		}
		else if (type.equals(Type.LONG_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;");
		}
		else if (type.equals(Type.FLOAT_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Float", "valueOf", "(F)Ljava/lang/Float;");
		}
		else if (type.equals(Type.DOUBLE_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, "java/lang/Double", "valueOf", "(D)Ljava/lang/Double;");
		}
		else {
			return false;
		}
		return true;
	}

	static final String HELPER_CLS_PATH = Helper.class.getName().replace('.', '/');
	static void unpackagePrivateData(Type type, MethodVisitor mv) {
		if (type.equals(Type.BOOLEAN_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Boolean;)Z");
		}
		else if (type.equals(Type.BYTE_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Byte;)B");
		}
		else if (type.equals(Type.CHAR_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Character;)C");
		}
		else if (type.equals(Type.SHORT_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Short;)S");
		}
		else if (type.equals(Type.INT_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Integer;)I");
		}
		else if (type.equals(Type.LONG_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Long;)J");
		}
		else if (type.equals(Type.FLOAT_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Float;)F");
		}
		else if (type.equals(Type.DOUBLE_TYPE)) {
			mv.visitMethodInsn(INVOKESTATIC, HELPER_CLS_PATH, "valueOf", "(Ljava/lang/Double;)D");
		}
	}

	static void checkCast(Type type, MethodVisitor mv) {
		if (type.getSort() == Type.ARRAY) {
			mv.visitTypeInsn(CHECKCAST, type.getDescriptor());
			return;
		}
		if (!type.equals(Type.getType(Object.class))) {
			if (type.getOpcode(IRETURN) != ARETURN) {
				checkCast2(type, mv);
				unpackagePrivateData(type, mv);
			}
			else {
				mv.visitTypeInsn(CHECKCAST, type.getClassName().replace('.', '/'));
			}
		}
	}

	static void checkCast2(Type type, MethodVisitor mv) {
		if (type.equals(Type.BOOLEAN_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Boolean");
		}
		else if (type.equals(Type.BYTE_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Byte");
		}
		else if (type.equals(Type.CHAR_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Character");
		}
		else if (type.equals(Type.SHORT_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Short");
		}
		else if (type.equals(Type.INT_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Integer");
		}
		else if (type.equals(Type.LONG_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Long");
		}
		else if (type.equals(Type.FLOAT_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Float");
		}
		else if (type.equals(Type.DOUBLE_TYPE)) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/Double");
		}
	}
}