public void getDeclaredMethod(
ClassFile file,
Bytecode code,
String declaringClass,
String methodName,
String[] parameterTypes) {
// get the correct class type to use to resolve the method
MethodInformation methodInfo =
new StaticMethodInformation(
"getTargetClass",
parameterTypes,
"Ljava/lang/Class;",
TargetInstanceProxy.class.getName());
invokeMethodHandler(file, code, methodInfo, false, DEFAULT_METHOD_RESOLVER);
code.addCheckcast("java/lang/Class");
// now we have the class on the stack
code.addLdc(methodName);
// now we need to load the parameter types into an array
code.addIconst(parameterTypes.length);
code.addAnewarray("java.lang.Class");
for (int i = 0; i < parameterTypes.length; ++i) {
code.add(Opcode.DUP); // duplicate the array reference
code.addIconst(i);
// now load the class object
String type = parameterTypes[i];
BytecodeUtils.pushClassType(code, type);
// and store it in the array
code.add(Opcode.AASTORE);
}
code.addInvokevirtual(
"java.lang.Class",
"getDeclaredMethod",
"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
}
public static void pushParametersIntoArray(Bytecode bc, String methodDescriptor) {
String[] params = DescriptorUtils.descriptorStringToParameterArray(methodDescriptor);
// now we need an array:
bc.addIconst(params.length);
bc.addAnewarray("java.lang.Object");
// now we have our array sitting on top of the stack
// we need to stick our parameters into it. We do this is reverse
// as we can't pull them from the bottom of the stack
for (int i = params.length - 1; i >= 0; --i) {
if (DescriptorUtils.isWide(params[i])) {
// dup the array below the wide
bc.add(Opcode.DUP_X2);
// now do it again so we have two copies
bc.add(Opcode.DUP_X2);
// now pop it, the is the equivalent of a wide swap
bc.add(Opcode.POP);
} else {
// duplicate the array to place 3
bc.add(Opcode.DUP_X1);
// now swap
bc.add(Opcode.SWAP);
}
// now the parameter is above the array
// box it if nessesary
if (DescriptorUtils.isPrimitive(params[i])) {
Boxing.box(bc, params[i].charAt(0));
}
// add the array index
bc.addIconst(i);
bc.add(Opcode.SWAP);
bc.add(Opcode.AASTORE);
// we still have the array on the top of the stack becuase we
// duplicated it earlier
}
}
