Java Code Examples for org.apache.bcel.Const#T_LONG

/**
 * Work around some weirdness in BCEL (inherited from JVM Spec 1): BCEL
 * considers long and double types to consume two slots on the stack. This
 * method ensures that we push two types for each double or long value.
 */
protected void pushValue(Type type) {
    if (type.getType() == Const.T_VOID) {
        throw new IllegalArgumentException("Can't push void");
    }
    TypeFrame frame = getFrame();
    if (type.getType() == Const.T_LONG) {
        frame.pushValue(Type.LONG);
        frame.pushValue(TypeFrame.getLongExtraType());
    } else if (type.getType() == Const.T_DOUBLE) {
        frame.pushValue(Type.DOUBLE);
        frame.pushValue(TypeFrame.getDoubleExtraType());
    } else {
        frame.pushValue(type);
    }
}
 

private int addConstant() {
    switch (super.getType().getType()) { // sic
        case Const.T_INT:
        case Const.T_CHAR:
        case Const.T_BYTE:
        case Const.T_BOOLEAN:
        case Const.T_SHORT:
            return super.getConstantPool().addInteger(((Integer) value).intValue());
        case Const.T_FLOAT:
            return super.getConstantPool().addFloat(((Float) value).floatValue());
        case Const.T_DOUBLE:
            return super.getConstantPool().addDouble(((Double) value).doubleValue());
        case Const.T_LONG:
            return super.getConstantPool().addLong(((Long) value).longValue());
        case Const.T_REFERENCE:
            return super.getConstantPool().addString((String) value);
        default:
            throw new IllegalStateException("Unhandled : " + super.getType().getType()); // sic
    }
}
 

public Instruction createAppend( final Type type ) {
    final byte t = type.getType();
    if (isString(type)) {
        return createInvoke(append_mos[0], Const.INVOKEVIRTUAL);
    }
    switch (t) {
        case Const.T_BOOLEAN:
        case Const.T_CHAR:
        case Const.T_FLOAT:
        case Const.T_DOUBLE:
        case Const.T_BYTE:
        case Const.T_SHORT:
        case Const.T_INT:
        case Const.T_LONG:
            return createInvoke(append_mos[t], Const.INVOKEVIRTUAL);
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return createInvoke(append_mos[1], Const.INVOKEVIRTUAL);
        default:
            throw new IllegalArgumentException("No append for this type? " + type);
    }
}
 

/** Create typed return
 */
public static ReturnInstruction createReturn( final Type type ) {
    switch (type.getType()) {
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return InstructionConst.ARETURN;
        case Const.T_INT:
        case Const.T_SHORT:
        case Const.T_BOOLEAN:
        case Const.T_CHAR:
        case Const.T_BYTE:
            return InstructionConst.IRETURN;
        case Const.T_FLOAT:
            return InstructionConst.FRETURN;
        case Const.T_DOUBLE:
            return InstructionConst.DRETURN;
        case Const.T_LONG:
            return InstructionConst.LRETURN;
        case Const.T_VOID:
            return InstructionConst.RETURN;
        default:
            throw new IllegalArgumentException("Invalid type: " + type);
    }
}
 

/**
 * Create binary operation for simple basic types, such as int and float.
 *
 * @param op operation, such as "+", "*", "<<", etc.
 */
public static ArithmeticInstruction createBinaryOperation( final String op, final Type type ) {
    final char first = op.charAt(0);
    switch (type.getType()) {
        case Const.T_BYTE:
        case Const.T_SHORT:
        case Const.T_INT:
        case Const.T_CHAR:
            return createBinaryIntOp(first, op);
        case Const.T_LONG:
            return createBinaryLongOp(first, op);
        case Const.T_FLOAT:
            return createBinaryFloatOp(first);
        case Const.T_DOUBLE:
            return createBinaryDoubleOp(first);
        default:
            throw new IllegalArgumentException("Invalid type " + type);
    }
}
 

/**
 * @param index index of local variable
 */
public static LocalVariableInstruction createStore( final Type type, final int index ) {
    switch (type.getType()) {
        case Const.T_BOOLEAN:
        case Const.T_CHAR:
        case Const.T_BYTE:
        case Const.T_SHORT:
        case Const.T_INT:
            return new ISTORE(index);
        case Const.T_FLOAT:
            return new FSTORE(index);
        case Const.T_DOUBLE:
            return new DSTORE(index);
        case Const.T_LONG:
            return new LSTORE(index);
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return new ASTORE(index);
        default:
            throw new IllegalArgumentException("Invalid type " + type);
    }
}
 

/**
 * @param index index of local variable
 */
public static LocalVariableInstruction createLoad( final Type type, final int index ) {
    switch (type.getType()) {
        case Const.T_BOOLEAN:
        case Const.T_CHAR:
        case Const.T_BYTE:
        case Const.T_SHORT:
        case Const.T_INT:
            return new ILOAD(index);
        case Const.T_FLOAT:
            return new FLOAD(index);
        case Const.T_DOUBLE:
            return new DLOAD(index);
        case Const.T_LONG:
            return new LLOAD(index);
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return new ALOAD(index);
        default:
            throw new IllegalArgumentException("Invalid type " + type);
    }
}
 

/**
 * @param type type of elements of array, i.e., array.getElementType()
 */
public static ArrayInstruction createArrayLoad( final Type type ) {
    switch (type.getType()) {
        case Const.T_BOOLEAN:
        case Const.T_BYTE:
            return InstructionConst.BALOAD;
        case Const.T_CHAR:
            return InstructionConst.CALOAD;
        case Const.T_SHORT:
            return InstructionConst.SALOAD;
        case Const.T_INT:
            return InstructionConst.IALOAD;
        case Const.T_FLOAT:
            return InstructionConst.FALOAD;
        case Const.T_DOUBLE:
            return InstructionConst.DALOAD;
        case Const.T_LONG:
            return InstructionConst.LALOAD;
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return InstructionConst.AALOAD;
        default:
            throw new IllegalArgumentException("Invalid type " + type);
    }
}
 

/**
 * @param type type of elements of array, i.e., array.getElementType()
 */
public static ArrayInstruction createArrayStore( final Type type ) {
    switch (type.getType()) {
        case Const.T_BOOLEAN:
        case Const.T_BYTE:
            return InstructionConst.BASTORE;
        case Const.T_CHAR:
            return InstructionConst.CASTORE;
        case Const.T_SHORT:
            return InstructionConst.SASTORE;
        case Const.T_INT:
            return InstructionConst.IASTORE;
        case Const.T_FLOAT:
            return InstructionConst.FASTORE;
        case Const.T_DOUBLE:
            return InstructionConst.DASTORE;
        case Const.T_LONG:
            return InstructionConst.LASTORE;
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return InstructionConst.AASTORE;
        default:
            throw new IllegalArgumentException("Invalid type " + type);
    }
}
 

public static BasicType getType( final byte type ) {
    switch (type) {
        case Const.T_VOID:
            return VOID;
        case Const.T_BOOLEAN:
            return BOOLEAN;
        case Const.T_BYTE:
            return BYTE;
        case Const.T_SHORT:
            return SHORT;
        case Const.T_CHAR:
            return CHAR;
        case Const.T_INT:
            return INT;
        case Const.T_LONG:
            return LONG;
        case Const.T_DOUBLE:
            return DOUBLE;
        case Const.T_FLOAT:
            return FLOAT;
        default:
            throw new ClassGenException("Invalid type: " + type);
    }
}
 

/** Create "null" value for reference types, 0 for basic types like int
 */
public static Instruction createNull( final Type type ) {
    switch (type.getType()) {
        case Const.T_ARRAY:
        case Const.T_OBJECT:
            return InstructionConst.ACONST_NULL;
        case Const.T_INT:
        case Const.T_SHORT:
        case Const.T_BOOLEAN:
        case Const.T_CHAR:
        case Const.T_BYTE:
            return InstructionConst.ICONST_0;
        case Const.T_FLOAT:
            return InstructionConst.FCONST_0;
        case Const.T_DOUBLE:
            return InstructionConst.DCONST_0;
        case Const.T_LONG:
            return InstructionConst.LCONST_0;
        case Const.T_VOID:
            return InstructionConst.NOP;
        default:
            throw new IllegalArgumentException("Invalid type: " + type);
    }
}
 

/** Checks if the constraints of operands of the said instruction(s) are satisfied. */
@Override
public void visitNEWARRAY(final NEWARRAY o) {
    final byte t = o.getTypecode();
    if (!    (    (t == Const.T_BOOLEAN)    ||
                    (t == Const.T_CHAR)            ||
                    (t == Const.T_FLOAT)        ||
                    (t == Const.T_DOUBLE)        ||
                    (t == Const.T_BYTE)            ||
                    (t == Const.T_SHORT)        ||
                    (t == Const.T_INT)            ||
                    (t == Const.T_LONG)    )    ) {
        constraintViolated(o, "Illegal type code '+t+' for 'atype' operand.");
    }
}
 

/**
 * Return type of signature as a byte value as defined in <em>Constants</em>
 *
 * @param  signature in format described above
 * @return type of signature
 * @see    Const
 *
 * @throws ClassFormatException if signature isn't a known type
 */
public static byte typeOfSignature( final String signature ) throws ClassFormatException {
    try {
        switch (signature.charAt(0)) {
            case 'B':
                return Const.T_BYTE;
            case 'C':
                return Const.T_CHAR;
            case 'D':
                return Const.T_DOUBLE;
            case 'F':
                return Const.T_FLOAT;
            case 'I':
                return Const.T_INT;
            case 'J':
                return Const.T_LONG;
            case 'L':
            case 'T':
                return Const.T_REFERENCE;
            case '[':
                return Const.T_ARRAY;
            case 'V':
                return Const.T_VOID;
            case 'Z':
                return Const.T_BOOLEAN;
            case 'S':
                return Const.T_SHORT;
            case '!':
            case '+':
            case '*':
                return typeOfSignature(signature.substring(1));
            default:
                throw new ClassFormatException("Invalid method signature: " + signature);
        }
    } catch (final StringIndexOutOfBoundsException e) {
        throw new ClassFormatException("Invalid method signature: " + signature, e);
    }
}
 

/**
 * @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;
    }
}
 

/** Create conversion operation for two stack operands, this may be an I2C, instruction, e.g.,
 * if the operands are basic types and CHECKCAST if they are reference types.
 */
public Instruction createCast( final Type src_type, final Type dest_type ) {
    if ((src_type instanceof BasicType) && (dest_type instanceof BasicType)) {
        final byte dest = dest_type.getType();
        byte src = src_type.getType();
        if (dest == Const.T_LONG
                && (src == Const.T_CHAR || src == Const.T_BYTE || src == Const.T_SHORT)) {
            src = Const.T_INT;
        }
        final String name = "org.apache.bcel.generic." + short_names[src - Const.T_CHAR] + "2"
                + short_names[dest - Const.T_CHAR];
        Instruction i = null;
        try {
            i = (Instruction) java.lang.Class.forName(name).newInstance();
        } catch (final Exception e) {
            throw new IllegalArgumentException("Could not find instruction: " + name, e);
        }
        return i;
    } else if ((src_type instanceof ReferenceType) && (dest_type instanceof ReferenceType)) {
        if (dest_type instanceof ArrayType) {
            return new CHECKCAST(cp.addArrayClass((ArrayType) dest_type));
        }
        return new CHECKCAST(cp.addClass(((ObjectType) dest_type).getClassName()));
    } else {
        throw new IllegalArgumentException("Cannot cast " + src_type + " to " + dest_type);
    }
}
 

@Override
public void initEntryFact(TypeFrame result) {
    // Make the frame valid
    result.setValid();

    int slot = 0;

    // Clear the stack slots in the frame
    result.clearStack();

    // Add local for "this" pointer, if present
    if (!methodGen.isStatic()) {
        result.setValue(slot++, ObjectTypeFactory.getInstance(methodGen.getClassName()));
    }

    // [Added: Support for Generics]
    // Get a parser that reads the generic signature of the method and
    // can be used to get the correct GenericObjectType if an argument
    // has a class type
    Iterator<String> iter = GenericSignatureParser.getGenericSignatureIterator(method);

    // Add locals for parameters.
    // Note that long and double parameters need to be handled
    // specially because they occupy two locals.
    Type[] argumentTypes = methodGen.getArgumentTypes();
    for (Type argType : argumentTypes) {
        // Add special "extra" type for long or double params.
        // These occupy the slot before the "plain" type.
        if (argType.getType() == Const.T_LONG) {
            result.setValue(slot++, TypeFrame.getLongExtraType());
        } else if (argType.getType() == Const.T_DOUBLE) {
            result.setValue(slot++, TypeFrame.getDoubleExtraType());
        }

        // [Added: Support for Generics]
        String s = (iter == null || !iter.hasNext()) ? null : iter.next();
        if (s != null && (argType instanceof ObjectType || argType instanceof ArrayType)
                && !(argType instanceof ExceptionObjectType)) {
            // replace with a generic version of the type
            try {
                Type t = GenericUtilities.getType(s);
                if (t != null) {
                    argType = t;
                }
            } catch (RuntimeException e) {
            } // degrade gracefully
        }

        // Add the plain parameter type.
        result.setValue(slot++, argType);
    }

    // Set remaining locals to BOTTOM; this will cause any
    // uses of them to be flagged
    while (slot < methodGen.getMaxLocals()) {
        result.setValue(slot++, TypeFrame.getBottomType());
    }
}
 

/**
 * Return whether the given FieldInstruction accesses a long or double
 * field.
 *
 * @param fieldIns
 *            the FieldInstruction
 * @param cpg
 *            the ConstantPoolGen for the method
 */
protected static boolean isLongOrDouble(FieldInstruction fieldIns, ConstantPoolGen cpg) {
    Type type = fieldIns.getFieldType(cpg);
    int code = type.getType();
    return code == Const.T_LONG || code == Const.T_DOUBLE;
}