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C-Struct like features for Java 6+ to improve performance.
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/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.wpm.codegen;

import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;
import org.objectweb.asm.commons.Method;

import net.wpm.codegen.Context;
import net.wpm.codegen.Expression;
import net.wpm.codegen.VarLocal;
import net.wpm.codegen.utils.Preconditions;
import net.wpm.codegen.utils.Primitives;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import static java.lang.ClassLoader.getSystemClassLoader;
import static java.lang.String.format;
import static java.util.Arrays.asList;
import static org.objectweb.asm.Type.CHAR_TYPE;
import static org.objectweb.asm.Type.getType;

public class Utils {

	private static final Map wrapperToPrimitive = new HashMap<>();

	static {
		for (Class primitiveType : Primitives.allPrimitiveTypes()) {
			Class wrappedType = Primitives.wrap(primitiveType);
			wrapperToPrimitive.put(wrappedType.getName(), getType(primitiveType));
		}
	}

	private static final Method BOOLEAN_VALUE = Method.getMethod("boolean booleanValue()");
	private static final Method CHAR_VALUE = Method.getMethod("char charValue()");
	private static final Method INT_VALUE = Method.getMethod("int intValue()");
	private static final Method FLOAT_VALUE = Method.getMethod("float floatValue()");
	private static final Method LONG_VALUE = Method.getMethod("long longValue()");
	private static final Method DOUBLE_VALUE = Method.getMethod("double doubleValue()");
	private static final Method SHORT_VALUE = Method.getMethod("short shortValue()");
	private static final Method BYTE_VALUE = Method.getMethod("byte byteValue()");

	private static final Type BOOLEAN_TYPE = getType(Boolean.class);
	private static final Type CHARACTER_TYPE = getType(Character.class);
	private static final Type BYTE_TYPE = getType(Byte.class);
	private static final Type SHORT_TYPE = getType(Short.class);
	private static final Type INT_TYPE = getType(Integer.class);
	private static final Type FLOAT_TYPE = getType(Float.class);
	private static final Type LONG_TYPE = getType(Long.class);
	private static final Type DOUBLE_TYPE = getType(Double.class);
	private static final Type VOID_TYPE = getType(Void.class);

	public static boolean isPrimitiveType(Type type) {
		int sort = type.getSort();
		return sort == Type.BOOLEAN ||
				sort == Type.CHAR ||
				sort == Type.BYTE ||
				sort == Type.SHORT ||
				sort == Type.INT ||
				sort == Type.FLOAT ||
				sort == Type.LONG ||
				sort == Type.DOUBLE ||
				sort == Type.VOID;
	}

	public static boolean isWrapperType(Type type) {
		return type.getSort() == Type.OBJECT &&
				wrapperToPrimitive.containsKey(type.getClassName());
	}

	public static Method primitiveValueMethod(Type type) {
		if (type.equals(getType(char.class)) || type.equals(CHAR_TYPE))
			return CHAR_VALUE;
		if (type.equals(getType(boolean.class)) || type.equals(BOOLEAN_TYPE))
			return BOOLEAN_VALUE;
		if (type.equals(getType(double.class)) || type.equals(DOUBLE_TYPE))
			return DOUBLE_VALUE;
		if (type.equals(getType(float.class)) || type.equals(FLOAT_TYPE))
			return FLOAT_VALUE;
		if (type.equals(getType(long.class)) || type.equals(LONG_TYPE))
			return LONG_VALUE;
		if (type.equals(getType(int.class)) || type.equals(INT_TYPE))
			return INT_VALUE;
		if (type.equals(getType(short.class)) || type.equals(SHORT_TYPE))
			return SHORT_VALUE;
		if (type.equals(getType(byte.class)) || type.equals(BYTE_TYPE))
			return BYTE_VALUE;

		throw new RuntimeException(format("No primitive value method for %s ", type.getClassName()));
	}

	public static Type wrap(Type type) {
		int sort = type.getSort();
		if (sort == Type.BOOLEAN)
			return BOOLEAN_TYPE;
		if (sort == Type.CHAR)
			return CHARACTER_TYPE;
		if (sort == Type.BYTE)
			return BYTE_TYPE;
		if (sort == Type.SHORT)
			return SHORT_TYPE;
		if (sort == Type.INT)
			return INT_TYPE;
		if (sort == Type.FLOAT)
			return FLOAT_TYPE;
		if (sort == Type.LONG)
			return LONG_TYPE;
		if (sort == Type.DOUBLE)
			return DOUBLE_TYPE;
		if (sort == Type.VOID)
			return VOID_TYPE;

		throw new RuntimeException(format("%s is not primitive", type.getClassName()));
	}

	public static Type unwrap(Type type) {
		Preconditions.check(type.getSort() == Type.OBJECT);
		Type result = wrapperToPrimitive.get(type.getClassName());
		Preconditions.check(result != null);
		return result;
	}

	public static Type complementTypeOrNull(Type type) {
		if (isPrimitiveType(type))
			return wrap(type);
		if (isWrapperType(type))
			return unwrap(type);
		return null;
	}

	public static Type complementType(Type type) {
		Type result = complementTypeOrNull(type);
		if (result != null)
			return result;

		throw new RuntimeException(format("%s is not primitive or wrapper", type.getClassName()));
	}

	public static Class getJavaType(ClassLoader classLoader, Type type) {
		int sort = type.getSort();
		if (sort == Type.BOOLEAN)
			return boolean.class;
		if (sort == Type.CHAR)
			return char.class;
		if (sort == Type.BYTE)
			return byte.class;
		if (sort == Type.SHORT)
			return short.class;
		if (sort == Type.INT)
			return int.class;
		if (sort == Type.FLOAT)
			return float.class;
		if (sort == Type.LONG)
			return long.class;
		if (sort == Type.DOUBLE)
			return double.class;
		if (sort == Type.VOID)
			return void.class;
		if (sort == Type.OBJECT) {
			try {
				return classLoader.loadClass(type.getClassName());
			} catch (ClassNotFoundException e) {
				throw new RuntimeException(format("No class %s in class loader", type.getClassName()), e);
			}
		}
		if (sort == Type.ARRAY) {
			Class result;
			if (type.equals(getType(Object[].class))) {
				result = Object[].class;
			} else {
				final String className = type.getDescriptor().replace('/', '.');
				try {
					result = Class.forName(className);
				} catch (ClassNotFoundException e) {
					throw new RuntimeException(format("No class %s in Class.forName", className), e);
				}
			}
			return result;
		}
		throw new RuntimeException(format("No Java type for %s", type.getClassName()));
	}

	public static Class getJavaType(Type type) {
		return getJavaType(getSystemClassLoader(), type);
	}

	public static Class tryGetJavaType(Type type) {
		return tryGetJavaType(getSystemClassLoader(), type);
	}

	public static Class tryGetJavaType(ClassLoader classLoader, Type type) {
		int sort = type.getSort();
		if (sort == Type.BOOLEAN)
			return boolean.class;
		if (sort == Type.CHAR)
			return char.class;
		if (sort == Type.BYTE)
			return byte.class;
		if (sort == Type.SHORT)
			return short.class;
		if (sort == Type.INT)
			return int.class;
		if (sort == Type.FLOAT)
			return float.class;
		if (sort == Type.LONG)
			return long.class;
		if (sort == Type.DOUBLE)
			return double.class;
		if (sort == Type.VOID)
			return void.class;
		if (sort == Type.OBJECT) {
			try {
				return classLoader.loadClass(type.getClassName());
			} catch (ClassNotFoundException e) {
				return Object.class;
			}
		}
		if (sort == Type.ARRAY) {
			Class result;
			if (type.equals(getType(Object[].class))) {
				result = Object[].class;
			} else {
				final String className = type.getDescriptor().replace('/', '.');
				try {
					result = Class.forName(className);
				} catch (ClassNotFoundException e) {
					throw new RuntimeException(format("No class %s in Class.forName", className), e);
				}
			}
			return result;
		}
		return Object.class;
	}

	public static void invokeVirtualOrInterface(GeneratorAdapter g, Class owner, Method method) {
		if (owner.isInterface())
			g.invokeInterface(getType(owner), method);
		else
			g.invokeVirtual(getType(owner), method);
	}

	public static VarLocal newLocal(Context ctx, Type type) {
		int local = ctx.getGeneratorAdapter().newLocal(type);
		return new VarLocal(local);
	}

	public static void loadAndCast(Context ctx, Expression expression, Type targetType) {
		Type type = expression.load(ctx);
		cast(ctx, type, targetType);
	}

	public static void cast(Context ctx, Type type, Type targetType) {
		GeneratorAdapter g = ctx.getGeneratorAdapter();

		if (type.equals(targetType)) {
			return;
		}

		if (targetType == Type.VOID_TYPE) {
			if (type.getSize() == 1)
				g.pop();
			if (type.getSize() == 2)
				g.pop2();
			return;
		}

		if (type == Type.VOID_TYPE) {
			throw new RuntimeException(format("Can't cast VOID_TYPE to %s. %s",
					targetType.getClassName(),
					exceptionInGeneratedClass(ctx)));
		}

		if (type.equals(ctx.getThisType())) {
			final Class javaType = getJavaType(ctx.getClassLoader(), targetType);
			for (Class aClass : ctx.getOtherClasses()) {
				if (javaType.isAssignableFrom(aClass)) {
					return;
				}
			}
			throw new RuntimeException(format("Can't cast self %s to %s, %s",
					type.getClassName(),
					targetType.getClassName(),
					exceptionInGeneratedClass(ctx)));
		}

		if (!type.equals(ctx.getThisType()) && !targetType.equals(ctx.getThisType()) &&
				getJavaType(ctx.getClassLoader(), targetType).isAssignableFrom(getJavaType(ctx.getClassLoader(), type))) {
			return;
		}

		if (targetType.equals(getType(Object.class)) && isPrimitiveType(type)) {
			g.box(type);
			g.cast(wrap(type), getType(Object.class));
			return;
		}

		if ((isPrimitiveType(type) || isWrapperType(type)) &&
				(isPrimitiveType(targetType) || isWrapperType(targetType))) {

			Type targetTypePrimitive = isPrimitiveType(targetType) ? targetType : unwrap(targetType);

			if (isWrapperType(type)) {
				g.invokeVirtual(type, primitiveValueMethod(targetType));
				return;
			}

			assert isPrimitiveType(type);

			if (type != targetTypePrimitive) {
				g.cast(type, targetTypePrimitive);
			}

			if (isWrapperType(targetType)) {
				g.valueOf(targetTypePrimitive);
			}

			return;
		}

		g.checkCast(targetType);
	}

	public static String exceptionInGeneratedClass(Context ctx) {
		return format("Throwed in generated class %s in method %s",
				ctx.getThisType().getClassName(),
				ctx.getNewMethod()
		);
	}

	public static  String argsToString(T[] args) {
		return argsToString(asList(args));
	}

	public static  String argsToString(T[] args, String separator) {
		return argsToString(asList(args), separator);
	}

	public static  String argsToString(Collection args) {
		return argsToString(args, ", ");
	}

	public static  String argsToString(Collection args, String separator) {
		StringBuilder stringBuilder = new StringBuilder();
		Iterator iterator = args.iterator();
		stringBuilder.append(iterator.next());
		while (iterator.hasNext()) {
			stringBuilder.append(separator).append(iterator.next());
		}
		return stringBuilder.toString();
	}
}