Java Code Examples for com.sun.org.apache.bcel.internal.generic.ConstantPoolGen

/**
 * Translates an external (primitive) Java type into a string.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateFrom
 */
public void translateFrom(ClassGenerator classGen,
    MethodGenerator methodGen, Class clazz)
{
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    if (clazz.getName().equals("java.lang.String")) {
        // same internal representation, convert null to ""
        il.append(DUP);
        final BranchHandle ifNonNull = il.append(new IFNONNULL(null));
        il.append(POP);
        il.append(new PUSH(cpg, ""));
        ifNonNull.setTarget(il.append(NOP));
    }
    else {
        ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
                                    toString(), clazz.getName());
        classGen.getParser().reportError(Constants.FATAL, err);
    }
}
 

public CompareGenerator(int access_flags, Type return_type,
                        Type[] arg_types, String[] arg_names,
                        String method_name, String class_name,
                        InstructionList il, ConstantPoolGen cp) {
    super(access_flags, return_type, arg_types, arg_names, method_name,
          class_name, il, cp);

    _iloadCurrent = new ILOAD(CURRENT_INDEX);
    _istoreCurrent = new ISTORE(CURRENT_INDEX);
    _aloadDom = new ALOAD(DOM_INDEX);
    _iloadLast = new ILOAD(LAST_INDEX);

    LocalVariableGen iterator =
        addLocalVariable("iterator",
                         Util.getJCRefType(Constants.NODE_ITERATOR_SIG),
                         null, null);
    ITERATOR_INDEX = iterator.getIndex();
    _aloadIterator = new ALOAD(ITERATOR_INDEX);
    _astoreIterator = new ASTORE(ITERATOR_INDEX);
    il.append(new ACONST_NULL());
    il.append(storeIterator());
}
 

/**
 * This method is called when the name of the element is known at compile time.
 * In this case, there is no need to inspect the element name at runtime to
 * determine if a prefix exists, needs to be generated, etc.
 */
public void translateLiteral(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    if (!_ignore) {
        il.append(methodGen.loadHandler());
        _name.translate(classGen, methodGen);
        il.append(DUP2);
        il.append(methodGen.startElement());

        if (_namespace != null) {
            il.append(methodGen.loadHandler());
            il.append(new PUSH(cpg, _prefix));
            _namespace.translate(classGen,methodGen);
            il.append(methodGen.namespace());
        }
    }

    translateContents(classGen, methodGen);

    if (!_ignore) {
        il.append(methodGen.endElement());
    }
}
 

/**
 * Generates code that loads the array that will contain the character
 * data represented by this Text node, followed by the offset of the
 * data from the start of the array, and then the length of the data.
 *
 * The pre-condition to calling this method is that
 * canLoadAsArrayOffsetLength() returns true.
 * @see #canLoadArrayOffsetLength()
 */
public void loadAsArrayOffsetLength(ClassGenerator classGen,
                                    MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    final XSLTC xsltc = classGen.getParser().getXSLTC();

    // The XSLTC object keeps track of character data
    // that is to be stored in char arrays.
    final int offset = xsltc.addCharacterData(_text);
    final int length = _text.length();
    String charDataFieldName =
        STATIC_CHAR_DATA_FIELD + (xsltc.getCharacterDataCount()-1);

    il.append(new GETSTATIC(cpg.addFieldref(xsltc.getClassName(),
                                   charDataFieldName,
                                   STATIC_CHAR_DATA_FIELD_SIG)));
    il.append(new PUSH(cpg, offset));
    il.append(new PUSH(cpg, _text.length()));
}
 

/**
 * Generates code that loads the array that will contain the character
 * data represented by this Text node, followed by the offset of the
 * data from the start of the array, and then the length of the data.
 *
 * The pre-condition to calling this method is that
 * canLoadAsArrayOffsetLength() returns true.
 * @see #canLoadArrayOffsetLength()
 */
public void loadAsArrayOffsetLength(ClassGenerator classGen,
                                    MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    final XSLTC xsltc = classGen.getParser().getXSLTC();

    // The XSLTC object keeps track of character data
    // that is to be stored in char arrays.
    final int offset = xsltc.addCharacterData(_text);
    final int length = _text.length();
    String charDataFieldName =
        STATIC_CHAR_DATA_FIELD + (xsltc.getCharacterDataCount()-1);

    il.append(new GETSTATIC(cpg.addFieldref(xsltc.getClassName(),
                                   charDataFieldName,
                                   STATIC_CHAR_DATA_FIELD_SIG)));
    il.append(new PUSH(cpg, offset));
    il.append(new PUSH(cpg, _text.length()));
}
 

/**
 * Translates an external (primitive) Java type into a string.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateFrom
 */
public void translateFrom(ClassGenerator classGen,
    MethodGenerator methodGen, Class clazz)
{
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    if (clazz.getName().equals("java.lang.String")) {
        // same internal representation, convert null to ""
        il.append(DUP);
        final BranchHandle ifNonNull = il.append(new IFNONNULL(null));
        il.append(POP);
        il.append(new PUSH(cpg, ""));
        ifNonNull.setTarget(il.append(NOP));
    }
    else {
        ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
                                    toString(), clazz.getName());
        classGen.getParser().reportError(Constants.FATAL, err);
    }
}
 

/**
 * Casts a reference into a NodeIterator.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        NodeSetType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToNodeSet",
                                 "("
                                 + OBJECT_SIG
                                 + ")"
                                 + NODE_ITERATOR_SIG);
    il.append(new INVOKESTATIC(index));

    // Reset this iterator
    index = cpg.addInterfaceMethodref(NODE_ITERATOR, RESET, RESET_SIG);
    il.append(new INVOKEINTERFACE(index, 1));
}
 

/**
 * Translates an external (primitive) Java type into a string.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateFrom
 */
public void translateFrom(ClassGenerator classGen,
    MethodGenerator methodGen, Class clazz)
{
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    if (clazz.getName().equals("java.lang.String")) {
        // same internal representation, convert null to ""
        il.append(DUP);
        final BranchHandle ifNonNull = il.append(new IFNONNULL(null));
        il.append(POP);
        il.append(new PUSH(cpg, ""));
        ifNonNull.setTarget(il.append(NOP));
    }
    else {
        ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
                                    toString(), clazz.getName());
        classGen.getParser().reportError(Constants.FATAL, err);
    }
}
 

public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final InstructionList il = methodGen.getInstructionList();

    if (methodGen instanceof CompareGenerator) {
        il.append(((CompareGenerator)methodGen).loadCurrentNode());
    }
    else if (methodGen instanceof TestGenerator) {
        il.append(new ILOAD(POSITION_INDEX));
    }
    else {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final int index = cpg.addInterfaceMethodref(NODE_ITERATOR,
                                                   "getPosition",
                                                   "()I");

        il.append(methodGen.loadIterator());
        il.append(new INVOKEINTERFACE(index,1));
    }
}
 

/**
 * Casts a reference into a NodeIterator.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        NodeSetType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToNodeSet",
                                 "("
                                 + OBJECT_SIG
                                 + ")"
                                 + NODE_ITERATOR_SIG);
    il.append(new INVOKESTATIC(index));

    // Reset this iterator
    index = cpg.addInterfaceMethodref(NODE_ITERATOR, RESET, RESET_SIG);
    il.append(new INVOKEINTERFACE(index, 1));
}
 

/**
 * Expects an integer on the stack and pushes its string value by calling
 * <code>Integer.toString(int i)</code>.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        StringType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    il.append(DUP);
    final BranchHandle ifNull = il.append(new IFNULL(null));
    il.append(new INVOKEVIRTUAL(cpg.addMethodref(_javaClassName,
                                                "toString",
                                                "()" + STRING_SIG)));
    final BranchHandle gotobh = il.append(new GOTO(null));
    ifNull.setTarget(il.append(POP));
    il.append(new PUSH(cpg, ""));
    gotobh.setTarget(il.append(NOP));
}
 

/**
 * Expects an result tree on the stack and pushes a boolean.
 * Translates a result tree to a boolean by first converting it to string.
 *
 * @param classGen A BCEL class generator
 * @param methodGen A BCEL method generator
 * @param type An instance of BooleanType (any)
 * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        BooleanType type) {
    // A result tree is always 'true' when converted to a boolean value,
    // since the tree always has at least one node (the root).
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(POP);      // don't need the DOM reference
    il.append(ICONST_1); // push 'true' on the stack
}
 

/**
 * This code generates a sequence of bytecodes that call the
 * addParameter() method in AbstractTranslet. The method call will add
 * (or update) the parameter frame with the new parameter value.
 */
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    // Translate the value and put it on the stack
    if (_doParameterOptimization) {
        translateValue(classGen, methodGen);
        return;
    }

    // Make name acceptable for use as field name in class
    String name = Util.escape(getEscapedName());

    // Load reference to the translet (method is in AbstractTranslet)
    il.append(classGen.loadTranslet());

    // Load the name of the parameter
    il.append(new PUSH(cpg, name)); // TODO: namespace ?
    // Generete the value of the parameter (use value in 'select' by def.)
    translateValue(classGen, methodGen);
    // Mark this parameter value is not being the default value
    il.append(new PUSH(cpg, false));
    // Pass the parameter to the template
    il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,
                                                 ADD_PARAMETER,
                                                 ADD_PARAMETER_SIG)));
    il.append(POP); // cleanup stack
}
 

public NamedMethodGenerator(int access_flags, Type return_type,
                            Type[] arg_types, String[] arg_names,
                            String method_name, String class_name,
                            InstructionList il, ConstantPoolGen cp) {
    super(access_flags, return_type, arg_types, arg_names, method_name,
          class_name, il, cp);
}
 

/**
 * Translate code that leaves a node's QName (as a String) on the stack
 */
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    final int getName = cpg.addInterfaceMethodref(DOM_INTF,
                                                  GET_NODE_NAME,
                                                  GET_NODE_NAME_SIG);
    super.translate(classGen, methodGen);
    il.append(new INVOKEINTERFACE(getName, 2));
}
 

public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    if (hasNodeSetArgs() || hasReferenceArgs()) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();

        // Call compare() from the BasisLibrary
        _left.translate(classGen, methodGen);
        _left.startIterator(classGen, methodGen);
        _right.translate(classGen, methodGen);
        _right.startIterator(classGen, methodGen);

        il.append(new PUSH(cpg, _op));
        il.append(methodGen.loadDOM());

        int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "compare",
                                     "("
                                     + _left.getType().toSignature()
                                     + _right.getType().toSignature()
                                     + "I"
                                     + DOM_INTF_SIG
                                     + ")Z");
        il.append(new INVOKESTATIC(index));
    }
    else {
        translateDesynthesized(classGen, methodGen);
        synthesize(classGen, methodGen);
    }
}
 

public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    // Feck the this pointer on the stack...
    il.append(methodGen.loadDOM());
    // ...then the entity name...
    _entity.translate(classGen, methodGen);
    // ...to get the URI from the DOM object.
    il.append(new INVOKEINTERFACE(
                     cpg.addInterfaceMethodref(DOM_INTF,
                                               GET_UNPARSED_ENTITY_URI,
                                               GET_UNPARSED_ENTITY_URI_SIG),
                     2));
}
 

/**
 * Translates an object of this type to its unboxed representation.
 */
public void translateUnBox(ClassGenerator classGen,
                           MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(new CHECKCAST(cpg.addClass(DOUBLE_CLASS)));
    il.append(new INVOKEVIRTUAL(cpg.addMethodref(DOUBLE_CLASS,
                                                 DOUBLE_VALUE,
                                                 DOUBLE_VALUE_SIG)));
}
 

/**
 * Expects an result tree on the stack and pushes a boolean.
 * Translates a result tree to a boolean by first converting it to string.
 *
 * @param classGen A BCEL class generator
 * @param methodGen A BCEL method generator
 * @param type An instance of BooleanType (any)
 * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        BooleanType type) {
    // A result tree is always 'true' when converted to a boolean value,
    // since the tree always has at least one node (the root).
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(POP);      // don't need the DOM reference
    il.append(ICONST_1); // push 'true' on the stack
}
 

/**
 * Translates a string into a non-synthesized boolean. It does not push a
 * 0 or a 1 but instead returns branchhandle list to be appended to the
 * false list.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateToDesynthesized
 */
public FlowList translateToDesynthesized(ClassGenerator classGen,
                                         MethodGenerator methodGen,
                                         BooleanType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
                                                 "length", "()I")));
    return new FlowList(il.append(new IFEQ(null)));
}
 

/**
 * Translates an object of this type to its unboxed representation.
 */
public void translateUnBox(ClassGenerator classGen,
                           MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(new CHECKCAST(cpg.addClass(INTEGER_CLASS)));
    final int index = cpg.addMethodref(INTEGER_CLASS,
                                       INT_VALUE,
                                       INT_VALUE_SIG);
    il.append(new INVOKEVIRTUAL(index));
}
 

/**
 * Translate code that leaves a node's namespace URI (as a String)
 * on the stack
 */
public void translate(ClassGenerator classGen,
                      MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    // Returns the string value for a node in the DOM
    final int getNamespace = cpg.addInterfaceMethodref(DOM_INTF,
                                                       "getNamespaceName",
                                                       "(I)"+STRING_SIG);
    super.translate(classGen, methodGen);
    il.append(new INVOKEINTERFACE(getNamespace, 2));
}
 

/**
 * Expects a double on the stack and pushes a boxed double. Boxed
 * double are represented by an instance of <code>java.lang.Double</code>.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        ReferenceType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(new NEW(cpg.addClass(DOUBLE_CLASS)));
    il.append(DUP_X2);
    il.append(DUP_X2);
    il.append(POP);
    il.append(new INVOKESPECIAL(cpg.addMethodref(DOUBLE_CLASS,
                                                 "<init>", "(D)V")));
}
 

public RtMethodGenerator(int access_flags, Type return_type,
                         Type[] arg_types, String[] arg_names,
                         String method_name, String class_name,
                         InstructionList il, ConstantPoolGen cp) {
    super(access_flags, return_type, arg_types, arg_names, method_name,
          class_name, il, cp);

    _astoreHandler = new ASTORE(HANDLER_INDEX);
    _aloadHandler  = new ALOAD(HANDLER_INDEX);
}
 

/**
 * Expects a node on the stack and pushes its string value.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        StringType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    switch (_type) {
    case NodeTest.ROOT:
    case NodeTest.ELEMENT:
        il.append(methodGen.loadDOM());
        il.append(SWAP); // dom ref must be below node index
        int index = cpg.addInterfaceMethodref(DOM_INTF,
                                              GET_ELEMENT_VALUE,
                                              GET_ELEMENT_VALUE_SIG);
        il.append(new INVOKEINTERFACE(index, 2));
        break;

    case NodeTest.ANODE:
    case NodeTest.COMMENT:
    case NodeTest.ATTRIBUTE:
    case NodeTest.PI:
        il.append(methodGen.loadDOM());
        il.append(SWAP); // dom ref must be below node index
        index = cpg.addInterfaceMethodref(DOM_INTF,
                                          GET_NODE_VALUE,
                                          GET_NODE_VALUE_SIG);
        il.append(new INVOKEINTERFACE(index, 2));
        break;

    default:
        ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
                                    toString(), type.toString());
        classGen.getParser().reportError(Constants.FATAL, err);
        break;
    }
}
 

/**
 * Compile expression and update true/false-lists
 */
public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    _base.translate(classGen, methodGen);
    _token.translate(classGen, methodGen);
    il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
                                                 "indexOf",
                                                 "("+STRING_SIG+")I")));
    _falseList.add(il.append(new IFLT(null)));
}
 

/**
 * Translates a reference into an object of internal type <code>type</code>.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        RealType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    il.append(methodGen.loadDOM());
    int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "numberF",
                                 "("
                                 + OBJECT_SIG
                                 + DOM_INTF_SIG
                                 + ")D");
    il.append(new INVOKESTATIC(index));
}
 

public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen) {
    FlowList fl;
    final Type ltype = _left.getType();

    // This is a special case for the self:: axis. Instead of letting
    // the Step object create and iterator that we cast back to a single
    // node, we simply ask the DOM for the node type.
    if (_typeTest) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();

        final int idx = cpg.addInterfaceMethodref(DOM_INTF,
                                                  "getExpandedTypeID",
                                                  "(I)I");
        il.append(new SIPUSH((short)((Step)_left).getNodeType()));
        il.append(methodGen.loadDOM());
        il.append(methodGen.loadContextNode());
        il.append(new INVOKEINTERFACE(idx, 2));
        _falseList.add(il.append(new IF_ICMPNE(null)));
    }
    else {

        _left.translate(classGen, methodGen);
        if (_type != ltype) {
            _left.startIterator(classGen, methodGen);
            if (_type instanceof BooleanType) {
                fl = ltype.translateToDesynthesized(classGen, methodGen,
                                                    _type);
                if (fl != null) {
                    _falseList.append(fl);
                }
            }
            else {
                ltype.translateTo(classGen, methodGen, _type);
            }
        }
    }
}
 

/**
 * Expects a boolean on the stack and pushes a boxed boolean.
 * Boxed booleans are represented by an instance of
 * <code>java.lang.Boolean</code>.
 *
 * @see     com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
 */
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                        ReferenceType type) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    il.append(new NEW(cpg.addClass(BOOLEAN_CLASS)));
    il.append(DUP_X1);
    il.append(SWAP);
    il.append(new INVOKESPECIAL(cpg.addMethodref(BOOLEAN_CLASS,
                                                 "<init>",
                                                 "(Z)V")));
}
 

/**
 * Translate contents only if this fallback element is put in place of
 * some unsupported element or non-XSLTC extension element
 */
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    if (_active) translateContents(classGen, methodGen);
}