/**
* Translate a function call. The compiled code will leave the function's return value on the
* JVM's stack.
*/
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final int n = argumentCount();
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final boolean isSecureProcessing = classGen.getParser().getXSLTC().isSecureProcessing();
int index;
// Translate calls to methods in the BasisLibrary
if (isStandard() || isExtension()) {
for (int i = 0; i < n; i++) {
final Expression exp = argument(i);
exp.translate(classGen, methodGen);
exp.startIterator(classGen, methodGen);
}
// append "F" to the function's name
final String name = _fname.toString().replace('-', '_') + "F";
String args = Constants.EMPTYSTRING;
// Special precautions for some method calls
if (name.equals("sumF")) {
args = DOM_INTF_SIG;
il.append(methodGen.loadDOM());
} else if (name.equals("normalize_spaceF")) {
if (_chosenMethodType.toSignature(args).equals("()Ljava/lang/String;")) {
args = "I" + DOM_INTF_SIG;
il.append(methodGen.loadContextNode());
il.append(methodGen.loadDOM());
}
}
// Invoke the method in the basis library
index = cpg.addMethodref(BASIS_LIBRARY_CLASS, name, _chosenMethodType.toSignature(args));
il.append(new INVOKESTATIC(index));
}
// Add call to BasisLibrary.unresolved_externalF() to generate
// run-time error message for unsupported external functions
else if (unresolvedExternal) {
index =
cpg.addMethodref(BASIS_LIBRARY_CLASS, "unresolved_externalF", "(Ljava/lang/String;)V");
il.append(new PUSH(cpg, _fname.toString()));
il.append(new INVOKESTATIC(index));
} else if (_isExtConstructor) {
if (isSecureProcessing) translateUnallowedExtension(cpg, il);
final String clazz = _chosenConstructor.getDeclaringClass().getName();
Class[] paramTypes = _chosenConstructor.getParameterTypes();
LocalVariableGen[] paramTemp = new LocalVariableGen[n];
// 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.
for (int i = 0; i < n; i++) {
final Expression exp = argument(i);
Type expType = exp.getType();
exp.translate(classGen, methodGen);
// Convert the argument to its Java type
exp.startIterator(classGen, methodGen);
expType.translateTo(classGen, methodGen, paramTypes[i]);
paramTemp[i] =
methodGen.addLocalVariable(
"function_call_tmp" + i, expType.toJCType(), il.getEnd(), null);
il.append(expType.STORE(paramTemp[i].getIndex()));
}
il.append(new NEW(cpg.addClass(_className)));
il.append(InstructionConstants.DUP);
for (int i = 0; i < n; i++) {
final Expression arg = argument(i);
il.append(arg.getType().LOAD(paramTemp[i].getIndex()));
}
final StringBuffer buffer = new StringBuffer();
buffer.append('(');
for (int i = 0; i < paramTypes.length; i++) {
buffer.append(getSignature(paramTypes[i]));
}
buffer.append(')');
buffer.append("V");
index = cpg.addMethodref(clazz, "<init>", buffer.toString());
il.append(new INVOKESPECIAL(index));
// Convert the return type back to our internal type
(Type.Object).translateFrom(classGen, methodGen, _chosenConstructor.getDeclaringClass());
}
// Invoke function calls that are handled in separate classes
else {
if (isSecureProcessing) translateUnallowedExtension(cpg, il);
final String clazz = _chosenMethod.getDeclaringClass().getName();
Class[] paramTypes = _chosenMethod.getParameterTypes();
// Push "this" if it is an instance method
if (_thisArgument != null) {
_thisArgument.translate(classGen, methodGen);
}
for (int i = 0; i < n; i++) {
final Expression exp = argument(i);
exp.translate(classGen, methodGen);
// Convert the argument to its Java type
exp.startIterator(classGen, methodGen);
exp.getType().translateTo(classGen, methodGen, paramTypes[i]);
}
final StringBuffer buffer = new StringBuffer();
buffer.append('(');
for (int i = 0; i < paramTypes.length; i++) {
buffer.append(getSignature(paramTypes[i]));
}
buffer.append(')');
buffer.append(getSignature(_chosenMethod.getReturnType()));
if (_thisArgument != null && _clazz.isInterface()) {
index = cpg.addInterfaceMethodref(clazz, _fname.getLocalPart(), buffer.toString());
il.append(new INVOKEINTERFACE(index, n + 1));
} else {
index = cpg.addMethodref(clazz, _fname.getLocalPart(), buffer.toString());
il.append(
_thisArgument != null
? (InvokeInstruction) new INVOKEVIRTUAL(index)
: (InvokeInstruction) new INVOKESTATIC(index));
}
// Convert the return type back to our internal type
_type.translateFrom(classGen, methodGen, _chosenMethod.getReturnType());
}
}
