static int appendMethodSignature(Class<?>[] argTypes, Class<?> returnType, StringBuilder sb) {
sb.append('(');
int firstLocal = 1 + argTypes.length; // includes this.
for (Class<?> type : argTypes) {
appendTypeString(sb, type);
if (type == Long.TYPE || type == Double.TYPE) {
// adjust for double slot
++firstLocal;
}
}
sb.append(')');
appendTypeString(sb, returnType);
return firstLocal;
}
private static StringBuilder appendTypeString(StringBuilder sb, Class<?> type) {
while (type.isArray()) {
sb.append('[');
type = type.getComponentType();
}
if (type.isPrimitive()) {
char typeLetter;
if (type == Boolean.TYPE) {
typeLetter = 'Z';
} else if (type == Long.TYPE) {
typeLetter = 'J';
} else {
String typeName = type.getName();
typeLetter = Character.toUpperCase(typeName.charAt(0));
}
sb.append(typeLetter);
} else {
sb.append('L');
sb.append(type.getName().replace('.', '/'));
sb.append(';');
}
return sb;
}
private static void generateCtor(
ClassFileWriter cfw, String adapterName, String superName, Constructor<?> superCtor) {
short locals = 3; // this + factory + delegee
Class<?>[] parameters = superCtor.getParameterTypes();
// Note that we swapped arguments in app-facing constructors to avoid
// conflicting signatures with serial constructor defined below.
if (parameters.length == 0) {
cfw.startMethod(
"<init>",
"(Laurora/javascript/Scriptable;" + "Laurora/javascript/ContextFactory;)V",
ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", "()V");
} else {
StringBuilder sig =
new StringBuilder(
"(Laurora/javascript/Scriptable;" + "Laurora/javascript/ContextFactory;");
int marker = sig.length(); // lets us reuse buffer for super signature
for (Class<?> c : parameters) {
appendTypeString(sig, c);
}
sig.append(")V");
cfw.startMethod("<init>", sig.toString(), ClassFileWriter.ACC_PUBLIC);
// Invoke base class constructor
cfw.add(ByteCode.ALOAD_0); // this
short paramOffset = 3;
for (Class<?> parameter : parameters) {
paramOffset += generatePushParam(cfw, paramOffset, parameter);
}
locals = paramOffset;
sig.delete(1, marker);
cfw.addInvoke(ByteCode.INVOKESPECIAL, superName, "<init>", sig.toString());
}
// Save parameter in instance variable "delegee"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_1); // first arg: Scriptable delegee
cfw.add(ByteCode.PUTFIELD, adapterName, "delegee", "Laurora/javascript/Scriptable;");
// Save parameter in instance variable "factory"
cfw.add(ByteCode.ALOAD_0); // this
cfw.add(ByteCode.ALOAD_2); // second arg: ContextFactory instance
cfw.add(ByteCode.PUTFIELD, adapterName, "factory", "Laurora/javascript/ContextFactory;");
cfw.add(ByteCode.ALOAD_0); // this for the following PUTFIELD for self
// create a wrapper object to be used as "this" in method calls
cfw.add(ByteCode.ALOAD_1); // the Scriptable delegee
cfw.add(ByteCode.ALOAD_0); // this
cfw.addInvoke(
ByteCode.INVOKESTATIC,
"aurora/javascript/JavaAdapter",
"createAdapterWrapper",
"(Laurora/javascript/Scriptable;"
+ "Ljava/lang/Object;"
+ ")Laurora/javascript/Scriptable;");
cfw.add(ByteCode.PUTFIELD, adapterName, "self", "Laurora/javascript/Scriptable;");
cfw.add(ByteCode.RETURN);
cfw.stopMethod(locals);
}