study_objc4/objc4-779.1/test/duplicateProtocols.m

#include "test.h"

// This test assumes
// - that on launch we don't have NSCoding, NSSecureCoding, or NSDictionary, ie, libSystem doesn't contain those
// - that after dlopening CF, we get NSDictionary and it conforms to NSSecureCoding which conforms to NSCoding
// - that our NSCoding will be used if we ask either NSSecureCoding or NSDictionary if they conform to our test protocol

@protocol NewNSCodingSuperProto
@end

@protocol NSCoding <NewNSCodingSuperProto>
@end

int main()
{
	// Before we dlopen, make sure we are using our NSCoding, not the shared cache version
	Protocol* codingSuperProto = objc_getProtocol("NewNSCodingSuperProto");
	Protocol* codingProto = objc_getProtocol("NSCoding");
	if (@protocol(NewNSCodingSuperProto) != codingSuperProto) fail("Protocol mismatch");
	if (@protocol(NSCoding) != codingProto) fail("Protocol mismatch");
	if (!protocol_conformsToProtocol(codingProto, codingSuperProto)) fail("Our NSCoding should conform to NewNSCodingSuperProto");

	// Also make sure we don't yet have an NSSecureCoding or NSDictionary
	if (objc_getProtocol("NSSecureCoding")) fail("Test assumes we don't have NSSecureCoding yet");
	if (objc_getClass("NSDictionary")) fail("Test assumes we don't have NSDictionary yet");

    void *dl = dlopen("/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation", RTLD_LAZY);
    if (!dl) fail("couldn't open CoreFoundation");
    
    // We should now have NSSecureCoding and NSDictionary
    Protocol* secureCodingProto = objc_getProtocol("NSSecureCoding");
    id dictionaryClass = objc_getClass("NSDictionary");
    if (!secureCodingProto) fail("Should have got NSSecureCoding from CoreFoundation");
    if (!dictionaryClass) fail("Should have got NSDictionary from CoreFoundation");

    // Now make sure that NSDictionary and NSSecureCoding find our new protocols
    if (!protocol_conformsToProtocol(secureCodingProto, codingProto)) fail("NSSecureCoding should conform to our NSCoding");
    if (!protocol_conformsToProtocol(secureCodingProto, codingSuperProto)) fail("NSSecureCoding should conform to our NewNSCodingSuperProto");
    if (!class_conformsToProtocol(dictionaryClass, codingProto)) fail("NSDictionary should conform to our NSCoding");
    if (!class_conformsToProtocol(dictionaryClass, codingSuperProto)) fail("NSDictionary should conform to our NewNSCodingSuperProto");
}