* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

import java.util.ArrayList;

import java.util.List;

import com.sun.org.apache.bcel.internal.Const;

import com.sun.org.apache.bcel.internal.classfile.ClassFormatException;

import com.sun.org.apache.bcel.internal.classfile.Utility;

 * Abstract super class for all possible java types, namely basic types such as

 * int, object types like String and array types, e.g. int[]

 * @version $Id: Type.java 1749603 2016-06-21 20:50:19Z ggregory $

public abstract class Type {

    private final byte type;

    private String signature; // signature for the type

    /**

     * Predefined constants

     */

    public static final BasicType VOID = new BasicType(Const.T_VOID);

    public static final BasicType BOOLEAN = new BasicType(Const.T_BOOLEAN);

    public static final BasicType INT = new BasicType(Const.T_INT);

    public static final BasicType SHORT = new BasicType(Const.T_SHORT);

    public static final BasicType BYTE = new BasicType(Const.T_BYTE);

    public static final BasicType LONG = new BasicType(Const.T_LONG);

    public static final BasicType DOUBLE = new BasicType(Const.T_DOUBLE);

    public static final BasicType FLOAT = new BasicType(Const.T_FLOAT);

    public static final BasicType CHAR = new BasicType(Const.T_CHAR);

    public static final ObjectType OBJECT = new ObjectType("java.lang.Object");

    public static final ObjectType CLASS = new ObjectType("java.lang.Class");

    public static final ObjectType STRING = new ObjectType("java.lang.String");

    public static final ObjectType STRINGBUFFER = new ObjectType("java.lang.StringBuffer");

    public static final ObjectType THROWABLE = new ObjectType("java.lang.Throwable");

    public static final Type[] NO_ARGS = new Type[0]; // EMPTY, so immutable

    public static final ReferenceType NULL = new ReferenceType() {

    };

    public static final Type UNKNOWN = new Type(Const.T_UNKNOWN, "<unknown object>") {

    };

    protected Type(final byte t, final String s) {

        type = t;

        signature = s;

    }

    /**

     * @return hashcode of Type

     */

    @Override

    public int hashCode() {

        return type ^ signature.hashCode();

    }

    /**

     * @return whether the Types are equal

     */

    @Override

    public boolean equals(final Object o) {

        if (o instanceof Type) {

            final Type t = (Type) o;

            return (type == t.type) && signature.equals(t.signature);

        }

        return false;

    /**

     * @return signature for given type.

     */

    public String getSignature() {

        return signature;

    }

    /**

     * @return type as defined in Constants

     */

    public byte getType() {

        return type;

    }

    /**

     * boolean, short and char variable are considered as int in the stack or

     * local variable area. Returns {@link Type#INT} for

     * {@link Type#BOOLEAN}, {@link Type#SHORT} or {@link Type#CHAR}, otherwise

     * returns the given type.

     *

     * @since 6.0

     */

    public Type normalizeForStackOrLocal() {

        if (this == Type.BOOLEAN || this == Type.BYTE || this == Type.SHORT || this == Type.CHAR) {

            return Type.INT;

        }

        return this;

    }

    /**

     * @return stack size of this type (2 for long and double, 0 for void, 1

     * otherwise)

     */

    public int getSize() {

        switch (type) {

            case Const.T_DOUBLE:

            case Const.T_LONG:

                return 2;

            case Const.T_VOID:

                return 0;

            default:

                return 1;

        }

    }

    /**

     * @return Type string, e.g. `int[]'

     */

    @Override

    public String toString() {

        return ((this.equals(Type.NULL) || (type >= Const.T_UNKNOWN))) ? signature : Utility

                .signatureToString(signature, false);

    }

    /**

     * Convert type to Java method signature, e.g. int[] f(java.lang.String x)

     * becomes (Ljava/lang/String;)[I

     *

     * @param return_type what the method returns

     * @param arg_types what are the argument types

     * @return method signature for given type(s).

     */

    public static String getMethodSignature(final Type return_type, final Type[] arg_types) {

        final StringBuilder buf = new StringBuilder("(");

        if (arg_types != null) {

            for (final Type arg_type : arg_types) {

                buf.append(arg_type.getSignature());

            }

        }

        buf.append(')');

        buf.append(return_type.getSignature());

        return buf.toString();

    }

    private static final ThreadLocal<Integer> consumed_chars = new ThreadLocal<Integer>() {

        @Override

        protected Integer initialValue() {

            return Integer.valueOf(0);

        }

    };//int consumed_chars=0; // Remember position in string, see getArgumentTypes

    private static int unwrap(final ThreadLocal<Integer> tl) {

        return tl.get().intValue();

    private static void wrap(final ThreadLocal<Integer> tl, final int value) {

        tl.set(Integer.valueOf(value));

    }

    /**

     * Convert signature to a Type object.

     *

     * @param signature signature string such as Ljava/lang/String;

     * @return type object

     */

    // @since 6.0 no longer final

    public static Type getType(final String signature) throws StringIndexOutOfBoundsException {

        final byte type = Utility.typeOfSignature(signature);

        if (type <= Const.T_VOID) {

            //corrected concurrent private static field acess

            wrap(consumed_chars, 1);

            return BasicType.getType(type);

        } else if (type == Const.T_ARRAY) {

            int dim = 0;

            do { // Count dimensions

                dim++;

            } while (signature.charAt(dim) == '[');

            // Recurse, but just once, if the signature is ok

            final Type t = getType(signature.substring(dim));

            //corrected concurrent private static field acess

            //  consumed_chars += dim; // update counter - is replaced by

            final int _temp = unwrap(consumed_chars) + dim;

            wrap(consumed_chars, _temp);

            return new ArrayType(t, dim);

        } else { // type == T_REFERENCE

            // Utility.signatureToString understands how to parse

            // generic types.

            final String parsedSignature = Utility.signatureToString(signature, false);

            wrap(consumed_chars, parsedSignature.length() + 2); // "Lblabla;" `L' and `;' are removed

            return ObjectType.getInstance(parsedSignature.replace('/', '.'));

        }

    /**

     * Convert return value of a method (signature) to a Type object.

     *

     * @param signature signature string such as (Ljava/lang/String;)V

     * @return return type

     */

    public static Type getReturnType(final String signature) {

        try {

            // Read return type after `)'

            final int index = signature.lastIndexOf(')') + 1;

            return getType(signature.substring(index));

        } catch (final StringIndexOutOfBoundsException e) { // Should never occur

            throw new ClassFormatException("Invalid method signature: " + signature, e);

        }

    }

    /**

     * Convert arguments of a method (signature) to an array of Type objects.

     *

     * @param signature signature string such as (Ljava/lang/String;)V

     * @return array of argument types

     */

    public static Type[] getArgumentTypes(final String signature) {

        final List<Type> vec = new ArrayList<>();

        int index;

        Type[] types;

        try { // Read all declarations between for `(' and `)'

            if (signature.charAt(0) != '(') {

                throw new ClassFormatException("Invalid method signature: " + signature);

            }

            index = 1; // current string position

            while (signature.charAt(index) != ')') {

                vec.add(getType(signature.substring(index)));

                //corrected concurrent private static field acess

                index += unwrap(consumed_chars); // update position

            }

        } catch (final StringIndexOutOfBoundsException e) { // Should never occur

            throw new ClassFormatException("Invalid method signature: " + signature, e);

        }

        types = new Type[vec.size()];

        vec.toArray(types);

        return types;

    }

    /**

     * Convert runtime java.lang.Class to BCEL Type object.

     *

     * @param cl Java class

     * @return corresponding Type object

     */

    public static Type getType(final java.lang.Class<?> cl) {

        if (cl == null) {

            throw new IllegalArgumentException("Class must not be null");

        }

        /* That's an amzingly easy case, because getName() returns

         * the signature. That's what we would have liked anyway.

         */

        if (cl.isArray()) {

            return getType(cl.getName());

        } else if (cl.isPrimitive()) {

            if (cl == Integer.TYPE) {

                return INT;

            } else if (cl == Void.TYPE) {

                return VOID;

            } else if (cl == Double.TYPE) {

                return DOUBLE;

            } else if (cl == Float.TYPE) {

                return FLOAT;

            } else if (cl == Boolean.TYPE) {

                return BOOLEAN;

            } else if (cl == Byte.TYPE) {

                return BYTE;

            } else if (cl == Short.TYPE) {

                return SHORT;

            } else if (cl == Byte.TYPE) {

                return BYTE;

            } else if (cl == Long.TYPE) {

                return LONG;

            } else if (cl == Character.TYPE) {

                return CHAR;

            } else {

                throw new IllegalStateException("Ooops, what primitive type is " + cl);

            }

        } else { // "Real" class

            return ObjectType.getInstance(cl.getName());

        }

    /**

     * Convert runtime java.lang.Class[] to BCEL Type objects.

     *

     * @param classes an array of runtime class objects

     * @return array of corresponding Type objects

    public static Type[] getTypes(final java.lang.Class<?>[] classes) {

        final Type[] ret = new Type[classes.length];

        for (int i = 0; i < ret.length; i++) {

            ret[i] = getType(classes[i]);

        }

        return ret;

    public static String getSignature(final java.lang.reflect.Method meth) {

        final StringBuilder sb = new StringBuilder("(");

        final Class<?>[] params = meth.getParameterTypes(); // avoid clone

        for (final Class<?> param : params) {

            sb.append(getType(param).getSignature());

        }

        sb.append(")");

        sb.append(getType(meth.getReturnType()).getSignature());

        return sb.toString();

    }

    static int size(final int coded) {

        return coded & 3;

    }

    static int consumed(final int coded) {

        return coded >> 2;

    }

    static int encode(final int size, final int consumed) {

        return consumed << 2 | size;

    static int getArgumentTypesSize(final String signature) {

        int res = 0;

        int index;

        try { // Read all declarations between for `(' and `)'

            if (signature.charAt(0) != '(') {

                throw new ClassFormatException("Invalid method signature: " + signature);

            }

            index = 1; // current string position

            while (signature.charAt(index) != ')') {

                final int coded = getTypeSize(signature.substring(index));

                res += size(coded);

                index += consumed(coded);

            }

        } catch (final StringIndexOutOfBoundsException e) { // Should never occur

            throw new ClassFormatException("Invalid method signature: " + signature, e);

        }

        return res;

    }

    static int getTypeSize(final String signature) throws StringIndexOutOfBoundsException {

        final byte type = Utility.typeOfSignature(signature);

        if (type <= Const.T_VOID) {

            return encode(BasicType.getType(type).getSize(), 1);

        } else if (type == Const.T_ARRAY) {

            int dim = 0;

            do { // Count dimensions

                dim++;

            } while (signature.charAt(dim) == '[');

            // Recurse, but just once, if the signature is ok

            final int consumed = consumed(getTypeSize(signature.substring(dim)));

            return encode(1, dim + consumed);

        } else { // type == T_REFERENCE

            final int index = signature.indexOf(';'); // Look for closing `;'

            if (index < 0) {

                throw new ClassFormatException("Invalid signature: " + signature);

            }

            return encode(1, index + 1);

        }

    }

    static int getReturnTypeSize(final String signature) {

        final int index = signature.lastIndexOf(')') + 1;

        return Type.size(getTypeSize(signature.substring(index)));

    }

    /*

     * Currently only used by the ArrayType constructor.

     * The signature has a complicated dependency on other parameter

     * so it's tricky to do it in a call to the super ctor.

     */

    void setSignature(final String signature) {

        this.signature = signature;

    }