com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator Java Examples

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));
    }
}
 

/**
 * Translate a predicate expression. If non of the optimizations apply
 * then this translation pushes two references on the stack: a reference
 * to a newly created filter object and a reference to the predicate's
 * closure. See class <code>Step</code> for further details.
 */
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();

    if (_nthPositionFilter || _nthDescendant) {
        _exp.translate(classGen, methodGen);
    }
    else if (isNodeValueTest() && (getParent() instanceof Step)) {
        _value.translate(classGen, methodGen);
        il.append(new CHECKCAST(cpg.addClass(STRING_CLASS)));
        il.append(new PUSH(cpg, ((EqualityExpr)_exp).getOp()));
    }
    else {
        translateFilter(classGen, methodGen);
    }
}
 

/**
 * 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()));
}
 

/**
 * Call translate() on all child syntax tree nodes.
 * @param classGen BCEL Java class generator
 * @param methodGen BCEL Java method generator
 */
protected void translateContents(ClassGenerator classGen,
                                 MethodGenerator methodGen) {
    // Call translate() on all child nodes
    final int n = elementCount();

    for (int i = 0; i < n; i++) {
        methodGen.markChunkStart();
        final SyntaxTreeNode item = (SyntaxTreeNode)_contents.elementAt(i);
        item.translate(classGen, methodGen);
        methodGen.markChunkEnd();
    }

    // After translation, unmap any registers for any variables/parameters
    // that were declared in this scope. Performing this unmapping in the
    // same AST scope as the declaration deals with the problems of
    // references falling out-of-scope inside the for-each element.
    // (the cause of which being 'lazy' register allocation for references)
    for (int i = 0; i < n; i++) {
        if( _contents.elementAt(i) instanceof VariableBase) {
            final VariableBase var = (VariableBase)_contents.elementAt(i);
            var.unmapRegister(methodGen);
        }
    }
}
 

private void compileTemplateCalls(ClassGenerator classGen,
                                  MethodGenerator methodGen,
                                  InstructionHandle next, int min, int max){
    for (Template template : _neededTemplates.keySet()) {
        final int prec = template.getImportPrecedence();
        if ((prec >= min) && (prec < max)) {
            if (template.hasContents()) {
                InstructionList til = template.compile(classGen, methodGen);
                til.append(new GOTO_W(next));
                _templateILs.put(template, til);
                _templateIHs.put(template, til.getStart());
            }
            else {
                // empty template
                _templateIHs.put(template, next);
            }
        }
    }
}
 

/**
 * 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()));
}
 

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

    if (argumentCount() == 0) {
        il.append(methodGen.loadContextNode());
        targ = Type.Node;
    }
    else {
        final Expression arg = argument();
        arg.translate(classGen, methodGen);
        arg.startIterator(classGen, methodGen);
        targ = arg.getType();
    }

    if (!targ.identicalTo(Type.Real)) {
        targ.translateTo(classGen, methodGen, Type.Real);
    }
}
 

/**
 * Compile the function call and treat as an expression
 * Update true/false-lists.
 */
@Override
public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen)
{
    Type type = Type.Boolean;
    if (_chosenMethodType != null)
        type = _chosenMethodType.resultType();

    final InstructionList il = methodGen.getInstructionList();
    translate(classGen, methodGen);

    if ((type instanceof BooleanType) || (type instanceof IntType)) {
        _falseList.add(il.append(new IFEQ(null)));
    }
}
 

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

    _value.translate(classGen, methodGen);
    _format.translate(classGen, methodGen);

    final int fn3arg = cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                        "formatNumber",
                                        "(DLjava/lang/String;"+
                                        "Ljava/text/DecimalFormat;)"+
                                        "Ljava/lang/String;");
    final int get = cpg.addMethodref(TRANSLET_CLASS,
                                     "getDecimalFormat",
                                     "(Ljava/lang/String;)"+
                                     "Ljava/text/DecimalFormat;");

    il.append(classGen.loadTranslet());
    if (_name == null) {
        il.append(new PUSH(cpg, EMPTYSTRING));
    }
    else if (_resolvedQName != null) {
        il.append(new PUSH(cpg, _resolvedQName.toString()));
    }
    else {
        _name.translate(classGen, methodGen);
    }
    il.append(new INVOKEVIRTUAL(get));
    il.append(new INVOKESTATIC(fn3arg));
}
 

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

    _left.translate(classGen, methodGen);
    final InstructionHandle gotot = il.append(new GOTO(null));
    il.append(methodGen.loadContextNode());
    _right.translate(classGen, methodGen);

    _left._trueList.backPatch(gotot);
    _left._falseList.backPatch(gotot.getNext());

    _trueList.append(_right._trueList.add(gotot));
    _falseList.append(_right._falseList);
}
 

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

    // Get two copies of the argument on the stack
    argument().translate(classGen, methodGen);
            il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                                        "roundF", "(D)D")));
}
 

/**
 * 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)));
}
 

/**
 * Translate this node into a fresh instruction list.
 * The original instruction list is saved and restored.
 */
public InstructionList compile(ClassGenerator classGen,
                               MethodGenerator methodGen) {
    final InstructionList result, save = methodGen.getInstructionList();
    methodGen.setInstructionList(result = new InstructionList());
    translate(classGen, methodGen);
    methodGen.setInstructionList(save);
    return result;
}
 

private void translateFilterExpr(ClassGenerator classGen,
                                 MethodGenerator methodGen,
                                 int predicateIndex) {
    if (predicateIndex >= 0) {
        translatePredicates(classGen, methodGen, predicateIndex);
    }
    else {
        _primary.translate(classGen, methodGen);
    }
}
 

public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = methodGen.getInstructionList();
    if (argumentCount() > 0) {
        argument().translate(classGen, methodGen);
    }
    else {
        il.append(methodGen.loadContextNode());
        Type.Node.translateTo(classGen, methodGen, Type.String);
    }
    il.append(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                                 "getStringLength",
                                                 "(Ljava/lang/String;)I")));
}
 

/**
 * Map this variable to a register
 */
public void mapRegister(MethodGenerator methodGen) {
    if (_local == null) {
        final InstructionList il = methodGen.getInstructionList();
        final String name = getEscapedName(); // TODO: namespace ?
        final com.sun.org.apache.bcel.internal.generic.Type varType = _type.toJCType();
        _local = methodGen.addLocalVariable2(name, varType, il.getEnd());
    }
}
 

public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen) {
    final InstructionList il = methodGen.getInstructionList();
    if (_value) {
        il.append(NOP);     // true list falls through
    }
    else {
        _falseList.add(il.append(new GOTO(null)));
    }
}
 

/**
 * 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));
}
 

/**
 * Compile the expression - leave boolean expression on stack
 */
public void translate(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,
                                                 "startsWith",
                                                 "("+STRING_SIG+")Z")));
}
 

/**
 * 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)));
}
 

/**
 * Translate this node into a fresh instruction list.
 * The original instruction list is saved and restored.
 */
public final InstructionList compile(ClassGenerator classGen,
                                     MethodGenerator methodGen) {
    final InstructionList result, save = methodGen.getInstructionList();
    methodGen.setInstructionList(result = new InstructionList());
    translate(classGen, methodGen);
    methodGen.setInstructionList(save);
    return result;
}
 

/**
 * Override this method to make sure that xsl:attributes are not
 * copied to output if this xsl:element is to be ignored
 */
public void translateContents(ClassGenerator classGen,
                              MethodGenerator methodGen) {
    final int n = elementCount();
    for (int i = 0; i < n; i++) {
        final SyntaxTreeNode item = getContents().get(i);
        if (_ignore && item instanceof XslAttribute) continue;
        item.translate(classGen, methodGen);
    }
}
 

/**
 * 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)));
}
 

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

    _value.translate(classGen, methodGen);
    _format.translate(classGen, methodGen);

    final int fn3arg = cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                        "formatNumber",
                                        "(DLjava/lang/String;"+
                                        "Ljava/text/DecimalFormat;)"+
                                        "Ljava/lang/String;");
    final int get = cpg.addMethodref(TRANSLET_CLASS,
                                     "getDecimalFormat",
                                     "(Ljava/lang/String;)"+
                                     "Ljava/text/DecimalFormat;");

    il.append(classGen.loadTranslet());
    if (_name == null) {
        il.append(new PUSH(cpg, EMPTYSTRING));
    }
    else if (_resolvedQName != null) {
        il.append(new PUSH(cpg, _resolvedQName.toString()));
    }
    else {
        _name.translate(classGen, methodGen);
    }
    il.append(new INVOKEVIRTUAL(get));
    il.append(new INVOKESTATIC(fn3arg));
}
 

/**
 * Compiles the predicate method
 */
private static void compileDefault(int defaultAction,
                                   ClassGenerator classGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = new InstructionList();
    final XSLTC xsltc = classGen.getParser().getXSLTC();

    // private boolean Translet.stripSpace(int type) - cannot be static
    final MethodGenerator stripSpace =
        new MethodGenerator(ACC_PUBLIC | ACC_FINAL ,
                    com.sun.org.apache.bcel.internal.generic.Type.BOOLEAN,
                    new com.sun.org.apache.bcel.internal.generic.Type[] {
                        Util.getJCRefType(DOM_INTF_SIG),
                        com.sun.org.apache.bcel.internal.generic.Type.INT,
                        com.sun.org.apache.bcel.internal.generic.Type.INT
                    },
                    new String[] { "dom","node","type" },
                    "stripSpace",classGen.getClassName(),il,cpg);

    classGen.addInterface("com/sun/org/apache/xalan/internal/xsltc/StripFilter");

    if (defaultAction == STRIP_SPACE)
        il.append(ICONST_1);
    else
        il.append(ICONST_0);
    il.append(IRETURN);

    classGen.addMethod(stripSpace);
}
 

/**
 * Translate this node into a fresh instruction list.
 * The original instruction list is saved and restored.
 */
public InstructionList compile(ClassGenerator classGen,
                               MethodGenerator methodGen) {
    final InstructionList result, save = methodGen.getInstructionList();
    methodGen.setInstructionList(result = new InstructionList());
    translate(classGen, methodGen);
    methodGen.setInstructionList(save);
    return result;
}
 

public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen) {
    final InstructionList il = methodGen.getInstructionList();
    if (_value) {
        il.append(NOP);     // true list falls through
    }
    else {
        _falseList.add(il.append(new GOTO(null)));
    }
}
 

public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen) {
    final InstructionList il = methodGen.getInstructionList();
    if (_value) {
        il.append(NOP);     // true list falls through
    }
    else {
        _falseList.add(il.append(new GOTO(null)));
    }
}
 

/**
 * Compiles the predicate method
 */
private static void compileDefault(int defaultAction,
                                   ClassGenerator classGen) {
    final ConstantPoolGen cpg = classGen.getConstantPool();
    final InstructionList il = new InstructionList();
    final XSLTC xsltc = classGen.getParser().getXSLTC();

    // private boolean Translet.stripSpace(int type) - cannot be static
    final MethodGenerator stripSpace =
        new MethodGenerator(ACC_PUBLIC | ACC_FINAL ,
                    com.sun.org.apache.bcel.internal.generic.Type.BOOLEAN,
                    new com.sun.org.apache.bcel.internal.generic.Type[] {
                        Util.getJCRefType(DOM_INTF_SIG),
                        com.sun.org.apache.bcel.internal.generic.Type.INT,
                        com.sun.org.apache.bcel.internal.generic.Type.INT
                    },
                    new String[] { "dom","node","type" },
                    "stripSpace",classGen.getClassName(),il,cpg);

    classGen.addInterface("com/sun/org/apache/xalan/internal/xsltc/StripFilter");

    if (defaultAction == STRIP_SPACE)
        il.append(ICONST_1);
    else
        il.append(ICONST_0);
    il.append(IRETURN);

    classGen.addMethod(stripSpace);
}
 

public void translateDesynthesized(ClassGenerator classGen,
                                   MethodGenerator methodGen) {
    final Type tleft = _left.getType();
    final InstructionList il = methodGen.getInstructionList();

    if (tleft instanceof BooleanType) {
        _left.translate(classGen, methodGen);
        _right.translate(classGen, methodGen);
    _falseList.add(il.append(_op == Operators.EQ ?
                                 (BranchInstruction)new IF_ICMPNE(null) :
                                 (BranchInstruction)new IF_ICMPEQ(null)));
    }
    else if (tleft instanceof NumberType) {
        _left.translate(classGen, methodGen);
        _right.translate(classGen, methodGen);

        if (tleft instanceof RealType) {
            il.append(DCMPG);
    _falseList.add(il.append(_op == Operators.EQ ?
                                     (BranchInstruction)new IFNE(null) :
                                     (BranchInstruction)new IFEQ(null)));
        }
        else {
        _falseList.add(il.append(_op == Operators.EQ ?
                                     (BranchInstruction)new IF_ICMPNE(null) :
                                     (BranchInstruction)new IF_ICMPEQ(null)));
        }
    }
    else {
        translate(classGen, methodGen);
        desynthesize(classGen, methodGen);
    }
}