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//
// GTMObjC2Runtime.m
//
// Copyright 2007-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import "GTMObjC2Runtime.h"
// Export a nonsense symbol to suppress a libtool warning when this is linked alone in a static lib.
__attribute__((visibility("default"))) char GTMObjC2RuntimeExportToSuppressLibToolWarning = 0;
#if GTM_MACOS_SDK && (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5) && !__OBJC2__
#import <objc/objc-runtime.h>
#import <stdlib.h>
#import <string.h>
Class object_getClass(id obj) {
if (!obj) return NULL;
return obj->isa;
}
const char *class_getName(Class cls) {
if (!cls) return "nil";
return cls->name;
}
BOOL class_conformsToProtocol(Class cls, Protocol *protocol) {
// We intentionally don't check cls as it crashes on Leopard so we want
// to crash on Tiger as well.
// I logged
// Radar 5572978 class_conformsToProtocol crashes when arg1 is passed as nil
// because it seems odd that this API won't accept nil for cls considering
// all the other apis will accept nil args.
// If this does get fixed, remember to enable the unit tests.
if (!protocol) return NO;
struct objc_protocol_list *protos;
for (protos = cls->protocols; protos != NULL; protos = protos->next) {
for (long i = 0; i < protos->count; i++) {
if ([protos->list[i] conformsTo:protocol]) {
return YES;
}
}
}
return NO;
}
Class class_getSuperclass(Class cls) {
if (!cls) return NULL;
return cls->super_class;
}
BOOL class_respondsToSelector(Class cls, SEL sel) {
return class_getInstanceMethod(cls, sel) != nil;
}
Method *class_copyMethodList(Class cls, unsigned int *outCount) {
if (!cls) return NULL;
unsigned int count = 0;
void *iterator = NULL;
struct objc_method_list *mlist;
Method *methods = NULL;
if (outCount) *outCount = 0;
while ( (mlist = class_nextMethodList(cls, &iterator)) ) {
if (mlist->method_count == 0) continue;
Method *new_methods = (Method *)realloc(methods,
sizeof(Method) * (count + mlist->method_count + 1));
if (!new_methods) {
// COV_NF_START
//Memory alloc failed, so what can we do?
free(methods);
return NULL;
// COV_NF_END
} else {
methods = new_methods;
}
for (int i = 0; i < mlist->method_count; i++) {
methods[i + count] = &mlist->method_list[i];
}
count += mlist->method_count;
}
// List must be NULL terminated
if (methods) {
methods[count] = NULL;
}
if (outCount) *outCount = count;
return methods;
}
SEL method_getName(Method method) {
if (!method) return NULL;
return method->method_name;
}
IMP method_getImplementation(Method method) {
if (!method) return NULL;
return method->method_imp;
}
IMP method_setImplementation(Method method, IMP imp) {
// We intentionally don't test method for nil.
// Leopard fails here, so should we.
// I logged this as Radar:
// 5572981 method_setImplementation crashes if you pass nil for the
// method arg (arg 1)
// because it seems odd that this API won't accept nil for method considering
// all the other apis will accept nil args.
// If this does get fixed, remember to enable the unit tests.
// This method works differently on SnowLeopard than
// on Leopard. If you pass in a nil for IMP on SnowLeopard
// it doesn't change anything. On Leopard it will. Since
// attempting to change a sel to nil is probably an error
// we follow the SnowLeopard way of doing things.
IMP oldImp = NULL;
if (imp) {
oldImp = method->method_imp;
method->method_imp = imp;
}
return oldImp;
}
void method_exchangeImplementations(Method m1, Method m2) {
if (m1 == m2) return;
if (!m1 || !m2) return;
IMP imp2 = method_getImplementation(m2);
IMP imp1 = method_setImplementation(m1, imp2);
method_setImplementation(m2, imp1);
}
struct objc_method_description protocol_getMethodDescription(Protocol *p,
SEL aSel,
BOOL isRequiredMethod,
BOOL isInstanceMethod) {
struct objc_method_description *descPtr = NULL;
// No such thing as required in ObjC1.
if (isInstanceMethod) {
descPtr = [p descriptionForInstanceMethod:aSel];
} else {
descPtr = [p descriptionForClassMethod:aSel];
}
struct objc_method_description desc;
if (descPtr) {
desc = *descPtr;
} else {
bzero(&desc, sizeof(desc));
}
return desc;
}
BOOL sel_isEqual(SEL lhs, SEL rhs) {
// Apple (informally) promises this will work in the future:
// http://twitter.com/#!/gparker/status/2400099786
return (lhs == rhs) ? YES : NO;
}
#endif // GTM_MACOS_SDK && (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5)
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