final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Create new StepIterator
final int initSI = cpg.addMethodref(STEP_ITERATOR_CLASS,
"<init>",
"("
+NODE_ITERATOR_SIG
+NODE_ITERATOR_SIG
+")V");
// Backwards branches are prohibited if an uninitialized object is
// on the stack by section 4.9.4 of the JVM Specification, 2nd Ed.
// We don't know whether this code might contain backwards branches,
// so we mustn't create the new object until after we've created
// the suspect arguments to its constructor. Instead we calculate
// the values of the arguments to the constructor first, store them
// in temporary variables, create the object and reload the
// arguments from the temporaries to avoid the problem.
// Recursively compile 2 iterators
_filterExpr.translate(classGen, methodGen);
LocalVariableGen filterTemp =
methodGen.addLocalVariable("filter_parent_path_tmp1",
Util.getJCRefType(NODE_ITERATOR_SIG),
il.getEnd(), null);
il.append(new ASTORE(filterTemp.getIndex()));
_path.translate(classGen, methodGen);
LocalVariableGen pathTemp =
methodGen.addLocalVariable("filter_parent_path_tmp2",
Util.getJCRefType(NODE_ITERATOR_SIG),
il.getEnd(), null);
il.append(new ASTORE(pathTemp.getIndex()));
il.append(new NEW(cpg.addClass(STEP_ITERATOR_CLASS)));
il.append(DUP);
il.append(new ALOAD(filterTemp.getIndex()));
il.append(new ALOAD(pathTemp.getIndex()));
// Initialize StepIterator with iterators from the stack
il.append(new INVOKESPECIAL(initSI));
// This is a special case for the //* path with or without predicates
if (_hasDescendantAxis) {
final int incl = cpg.addMethodref(NODE_ITERATOR_BASE,
"includeSelf",
"()" + NODE_ITERATOR_SIG);
il.append(new INVOKEVIRTUAL(incl));
}
if (!(getParent() instanceof RelativeLocationPath) &&
!(getParent() instanceof FilterParentPath)) {
final int order = cpg.addInterfaceMethodref(DOM_INTF,
ORDER_ITERATOR,
ORDER_ITERATOR_SIG);
il.append(methodGen.loadDOM());
il.append(SWAP);
il.append(methodGen.loadContextNode());
il.append(new INVOKEINTERFACE(order, 3));
}
